/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp

Bug Summary

File:	clang/lib/Sema/SemaTemplateInstantiate.cpp
Warning:	line 2791, column 41 Called C++ object pointer is null

Annotated Source Code

Press '?' to see keyboard shortcuts

Show analyzer invocation

clang -cc1 -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name SemaTemplateInstantiate.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -analyzer-config-compatibility-mode=true -mrelocation-model pic -pic-level 2 -mframe-pointer=none -relaxed-aliasing -fmath-errno -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -tune-cpu generic -fno-split-dwarf-inlining -debugger-tuning=gdb -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-12/lib/clang/12.0.0 -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/build-llvm/tools/clang/lib/Sema -I /build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema -I /build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/include -I /build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/build-llvm/tools/clang/include -I /build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/build-llvm/include -I /build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/llvm/include -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0/backward -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-12/lib/clang/12.0.0/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-comment -std=c++14 -fdeprecated-macro -fdebug-compilation-dir /build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/build-llvm/tools/clang/lib/Sema -fdebug-prefix-map=/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d=. -ferror-limit 19 -fvisibility-inlines-hidden -stack-protector 2 -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -o /tmp/scan-build-2020-11-29-190409-37574-1 -x c++ /build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp

/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp

→

1//===------- SemaTemplateInstantiate.cpp - C++ Template Instantiation ------===/
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//===----------------------------------------------------------------------===/
7//
8//  This file implements C++ template instantiation.
9//
10//===----------------------------------------------------------------------===/

12#include "TreeTransform.h"
13#include "clang/AST/ASTConsumer.h"
14#include "clang/AST/ASTContext.h"
15#include "clang/AST/ASTLambda.h"
16#include "clang/AST/ASTMutationListener.h"
17#include "clang/AST/DeclTemplate.h"
18#include "clang/AST/Expr.h"
19#include "clang/AST/PrettyDeclStackTrace.h"
20#include "clang/AST/TypeVisitor.h"
21#include "clang/Basic/LangOptions.h"
22#include "clang/Basic/Stack.h"
23#include "clang/Basic/TargetInfo.h"
24#include "clang/Sema/DeclSpec.h"
25#include "clang/Sema/Initialization.h"
26#include "clang/Sema/Lookup.h"
27#include "clang/Sema/SemaConcept.h"
28#include "clang/Sema/SemaInternal.h"
29#include "clang/Sema/Template.h"
30#include "clang/Sema/TemplateDeduction.h"
31#include "clang/Sema/TemplateInstCallback.h"
32#include "llvm/Support/TimeProfiler.h"

34using namespace clang;
35using namespace sema;

37//===----------------------------------------------------------------------===/
38// Template Instantiation Support
39//===----------------------------------------------------------------------===/

41/// Retrieve the template argument list(s) that should be used to
42/// instantiate the definition of the given declaration.
43///
44/// \param D the declaration for which we are computing template instantiation
45/// arguments.
46///
47/// \param Innermost if non-NULL, the innermost template argument list.
48///
49/// \param RelativeToPrimary true if we should get the template
50/// arguments relative to the primary template, even when we're
51/// dealing with a specialization. This is only relevant for function
52/// template specializations.
53///
54/// \param Pattern If non-NULL, indicates the pattern from which we will be
55/// instantiating the definition of the given declaration, \p D. This is
56/// used to determine the proper set of template instantiation arguments for
57/// friend function template specializations.
58MultiLevelTemplateArgumentList
59Sema::getTemplateInstantiationArgs(NamedDecl *D,
                                 const TemplateArgumentList *Innermost,
                                 bool RelativeToPrimary,
                                 const FunctionDecl *Pattern) {
// Accumulate the set of template argument lists in this structure.
MultiLevelTemplateArgumentList Result;

if (Innermost)
  Result.addOuterTemplateArguments(Innermost);

DeclContext *Ctx = dyn_cast<DeclContext>(D);
if (!Ctx) {
  Ctx = D->getDeclContext();

  // Add template arguments from a variable template instantiation. For a
  // class-scope explicit specialization, there are no template arguments
  // at this level, but there may be enclosing template arguments.
  VarTemplateSpecializationDecl *Spec =
      dyn_cast<VarTemplateSpecializationDecl>(D);
  if (Spec && !Spec->isClassScopeExplicitSpecialization()) {
    // We're done when we hit an explicit specialization.
    if (Spec->getSpecializationKind() == TSK_ExplicitSpecialization &&
        !isa<VarTemplatePartialSpecializationDecl>(Spec))
      return Result;

    Result.addOuterTemplateArguments(&Spec->getTemplateInstantiationArgs());

    // If this variable template specialization was instantiated from a
    // specialized member that is a variable template, we're done.
    assert(Spec->getSpecializedTemplate() && "No variable template?")((Spec->getSpecializedTemplate() && "No variable template?"
) ? static_cast<void> (0) : __assert_fail ("Spec->getSpecializedTemplate() && \"No variable template?\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 88, __PRETTY_FUNCTION__));
    llvm::PointerUnion<VarTemplateDecl*,
                       VarTemplatePartialSpecializationDecl*> Specialized
                           = Spec->getSpecializedTemplateOrPartial();
    if (VarTemplatePartialSpecializationDecl *Partial =
            Specialized.dyn_cast<VarTemplatePartialSpecializationDecl *>()) {
      if (Partial->isMemberSpecialization())
        return Result;
    } else {
      VarTemplateDecl *Tmpl = Specialized.get<VarTemplateDecl *>();
      if (Tmpl->isMemberSpecialization())
        return Result;
    }
  }

  // If we have a template template parameter with translation unit context,
  // then we're performing substitution into a default template argument of
  // this template template parameter before we've constructed the template
  // that will own this template template parameter. In this case, we
  // use empty template parameter lists for all of the outer templates
  // to avoid performing any substitutions.
  if (Ctx->isTranslationUnit()) {
    if (TemplateTemplateParmDecl *TTP
                                    = dyn_cast<TemplateTemplateParmDecl>(D)) {
      for (unsigned I = 0, N = TTP->getDepth() + 1; I != N; ++I)
        Result.addOuterTemplateArguments(None);
      return Result;
    }
  }
}

while (!Ctx->isFileContext()) {
  // Add template arguments from a class template instantiation.
  ClassTemplateSpecializationDecl *Spec
        = dyn_cast<ClassTemplateSpecializationDecl>(Ctx);
  if (Spec && !Spec->isClassScopeExplicitSpecialization()) {
    // We're done when we hit an explicit specialization.
    if (Spec->getSpecializationKind() == TSK_ExplicitSpecialization &&
        !isa<ClassTemplatePartialSpecializationDecl>(Spec))
      break;

    Result.addOuterTemplateArguments(&Spec->getTemplateInstantiationArgs());

    // If this class template specialization was instantiated from a
    // specialized member that is a class template, we're done.
    assert(Spec->getSpecializedTemplate() && "No class template?")((Spec->getSpecializedTemplate() && "No class template?"
) ? static_cast<void> (0) : __assert_fail ("Spec->getSpecializedTemplate() && \"No class template?\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 133, __PRETTY_FUNCTION__));
    if (Spec->getSpecializedTemplate()->isMemberSpecialization())
      break;
  }
  // Add template arguments from a function template specialization.
  else if (FunctionDecl *Function = dyn_cast<FunctionDecl>(Ctx)) {
    if (!RelativeToPrimary &&
        Function->getTemplateSpecializationKindForInstantiation() ==
            TSK_ExplicitSpecialization)
      break;

    if (!RelativeToPrimary && Function->getTemplateSpecializationKind() ==
                                  TSK_ExplicitSpecialization) {
      // This is an implicit instantiation of an explicit specialization. We
      // don't get any template arguments from this function but might get
      // some from an enclosing template.
    } else if (const TemplateArgumentList *TemplateArgs
          = Function->getTemplateSpecializationArgs()) {
      // Add the template arguments for this specialization.
      Result.addOuterTemplateArguments(TemplateArgs);

      // If this function was instantiated from a specialized member that is
      // a function template, we're done.
      assert(Function->getPrimaryTemplate() && "No function template?")((Function->getPrimaryTemplate() && "No function template?"
) ? static_cast<void> (0) : __assert_fail ("Function->getPrimaryTemplate() && \"No function template?\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 156, __PRETTY_FUNCTION__));
      if (Function->getPrimaryTemplate()->isMemberSpecialization())
        break;

      // If this function is a generic lambda specialization, we are done.
      if (isGenericLambdaCallOperatorOrStaticInvokerSpecialization(Function))
        break;

    } else if (FunctionTemplateDecl *FunTmpl
                                 = Function->getDescribedFunctionTemplate()) {
      // Add the "injected" template arguments.
      Result.addOuterTemplateArguments(FunTmpl->getInjectedTemplateArgs());
    }

    // If this is a friend declaration and it declares an entity at
    // namespace scope, take arguments from its lexical parent
    // instead of its semantic parent, unless of course the pattern we're
    // instantiating actually comes from the file's context!
    if (Function->getFriendObjectKind() &&
        Function->getDeclContext()->isFileContext() &&
        (!Pattern || !Pattern->getLexicalDeclContext()->isFileContext())) {
      Ctx = Function->getLexicalDeclContext();
      RelativeToPrimary = false;
      continue;
    }
  } else if (CXXRecordDecl *Rec = dyn_cast<CXXRecordDecl>(Ctx)) {
    if (ClassTemplateDecl *ClassTemplate = Rec->getDescribedClassTemplate()) {
      QualType T = ClassTemplate->getInjectedClassNameSpecialization();
      const TemplateSpecializationType *TST =
          cast<TemplateSpecializationType>(Context.getCanonicalType(T));
      Result.addOuterTemplateArguments(
          llvm::makeArrayRef(TST->getArgs(), TST->getNumArgs()));
      if (ClassTemplate->isMemberSpecialization())
        break;
    }
  }

  Ctx = Ctx->getParent();
  RelativeToPrimary = false;
}

return Result;
198}

200bool Sema::CodeSynthesisContext::isInstantiationRecord() const {
switch (Kind) {
case TemplateInstantiation:
case ExceptionSpecInstantiation:
case DefaultTemplateArgumentInstantiation:
case DefaultFunctionArgumentInstantiation:
case ExplicitTemplateArgumentSubstitution:
case DeducedTemplateArgumentSubstitution:
case PriorTemplateArgumentSubstitution:
case ConstraintsCheck:
case NestedRequirementConstraintsCheck:
  return true;

case RequirementInstantiation:
case DefaultTemplateArgumentChecking:
case DeclaringSpecialMember:
case DeclaringImplicitEqualityComparison:
case DefiningSynthesizedFunction:
case ExceptionSpecEvaluation:
case ConstraintSubstitution:
case ParameterMappingSubstitution:
case ConstraintNormalization:
case RewritingOperatorAsSpaceship:
case InitializingStructuredBinding:
case MarkingClassDllexported:
  return false;

// This function should never be called when Kind's value is Memoization.
case Memoization:
  break;
}

llvm_unreachable("Invalid SynthesisKind!")::llvm::llvm_unreachable_internal("Invalid SynthesisKind!", "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 232);
233}

235Sema::InstantiatingTemplate::InstantiatingTemplate(
  Sema &SemaRef, CodeSynthesisContext::SynthesisKind Kind,
  SourceLocation PointOfInstantiation, SourceRange InstantiationRange,
  Decl *Entity, NamedDecl *Template, ArrayRef<TemplateArgument> TemplateArgs,
  sema::TemplateDeductionInfo *DeductionInfo)
  : SemaRef(SemaRef) {
// Don't allow further instantiation if a fatal error and an uncompilable
// error have occurred. Any diagnostics we might have raised will not be
// visible, and we do not need to construct a correct AST.
if (SemaRef.Diags.hasFatalErrorOccurred() &&
36
←
Assuming the condition is false→
    SemaRef.hasUncompilableErrorOccurred()) {
  Invalid = true;
  return;
}
Invalid = CheckInstantiationDepth(PointOfInstantiation, InstantiationRange);
37
←
Calling 'InstantiatingTemplate::CheckInstantiationDepth'→
43
←
Returning from 'InstantiatingTemplate::CheckInstantiationDepth'→
if (!Invalid43.1
Field 'Invalid' is false
1
Field 'Invalid' is false
) {
44
←
Taking true branch→
  CodeSynthesisContext Inst;
  Inst.Kind = Kind;
  Inst.PointOfInstantiation = PointOfInstantiation;
  Inst.Entity = Entity;
  Inst.Template = Template;
  Inst.TemplateArgs = TemplateArgs.data();
  Inst.NumTemplateArgs = TemplateArgs.size();
  Inst.DeductionInfo = DeductionInfo;
  Inst.InstantiationRange = InstantiationRange;
  SemaRef.pushCodeSynthesisContext(Inst);

  AlreadyInstantiating = !Inst.Entity44.1
Field 'Entity' is non-null
1
Field 'Entity' is non-null
 ? false :
45
←
'?' condition is false→
      !SemaRef.InstantiatingSpecializations
46
←
Assuming field 'second' is true→
           .insert(std::make_pair(Inst.Entity->getCanonicalDecl(), Inst.Kind))
           .second;
  atTemplateBegin(SemaRef.TemplateInstCallbacks, SemaRef, Inst);
}
268}

270Sema::InstantiatingTemplate::InstantiatingTemplate(
  Sema &SemaRef, SourceLocation PointOfInstantiation, Decl *Entity,
  SourceRange InstantiationRange)
  : InstantiatingTemplate(SemaRef,
35
←
Calling constructor for 'InstantiatingTemplate'→
47
←
Returning from constructor for 'InstantiatingTemplate'→
                          CodeSynthesisContext::TemplateInstantiation,
                          PointOfInstantiation, InstantiationRange, Entity) {}

277Sema::InstantiatingTemplate::InstantiatingTemplate(
  Sema &SemaRef, SourceLocation PointOfInstantiation, FunctionDecl *Entity,
  ExceptionSpecification, SourceRange InstantiationRange)
  : InstantiatingTemplate(
        SemaRef, CodeSynthesisContext::ExceptionSpecInstantiation,
        PointOfInstantiation, InstantiationRange, Entity) {}

284Sema::InstantiatingTemplate::InstantiatingTemplate(
  Sema &SemaRef, SourceLocation PointOfInstantiation, TemplateParameter Param,
  TemplateDecl *Template, ArrayRef<TemplateArgument> TemplateArgs,
  SourceRange InstantiationRange)
  : InstantiatingTemplate(
        SemaRef,
        CodeSynthesisContext::DefaultTemplateArgumentInstantiation,
        PointOfInstantiation, InstantiationRange, getAsNamedDecl(Param),
        Template, TemplateArgs) {}

294Sema::InstantiatingTemplate::InstantiatingTemplate(
  Sema &SemaRef, SourceLocation PointOfInstantiation,
  FunctionTemplateDecl *FunctionTemplate,
  ArrayRef<TemplateArgument> TemplateArgs,
  CodeSynthesisContext::SynthesisKind Kind,
  sema::TemplateDeductionInfo &DeductionInfo, SourceRange InstantiationRange)
  : InstantiatingTemplate(SemaRef, Kind, PointOfInstantiation,
                          InstantiationRange, FunctionTemplate, nullptr,
                          TemplateArgs, &DeductionInfo) {
assert(((Kind == CodeSynthesisContext::ExplicitTemplateArgumentSubstitution
 || Kind == CodeSynthesisContext::DeducedTemplateArgumentSubstitution
) ? static_cast<void> (0) : __assert_fail ("Kind == CodeSynthesisContext::ExplicitTemplateArgumentSubstitution || Kind == CodeSynthesisContext::DeducedTemplateArgumentSubstitution"
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 305, __PRETTY_FUNCTION__))
  Kind == CodeSynthesisContext::ExplicitTemplateArgumentSubstitution ||((Kind == CodeSynthesisContext::ExplicitTemplateArgumentSubstitution
 || Kind == CodeSynthesisContext::DeducedTemplateArgumentSubstitution
) ? static_cast<void> (0) : __assert_fail ("Kind == CodeSynthesisContext::ExplicitTemplateArgumentSubstitution || Kind == CodeSynthesisContext::DeducedTemplateArgumentSubstitution"
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 305, __PRETTY_FUNCTION__))
  Kind == CodeSynthesisContext::DeducedTemplateArgumentSubstitution)((Kind == CodeSynthesisContext::ExplicitTemplateArgumentSubstitution
 || Kind == CodeSynthesisContext::DeducedTemplateArgumentSubstitution
) ? static_cast<void> (0) : __assert_fail ("Kind == CodeSynthesisContext::ExplicitTemplateArgumentSubstitution || Kind == CodeSynthesisContext::DeducedTemplateArgumentSubstitution"
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 305, __PRETTY_FUNCTION__));
306}

308Sema::InstantiatingTemplate::InstantiatingTemplate(
  Sema &SemaRef, SourceLocation PointOfInstantiation,
  TemplateDecl *Template,
  ArrayRef<TemplateArgument> TemplateArgs,
  sema::TemplateDeductionInfo &DeductionInfo, SourceRange InstantiationRange)
  : InstantiatingTemplate(
        SemaRef,
        CodeSynthesisContext::DeducedTemplateArgumentSubstitution,
        PointOfInstantiation, InstantiationRange, Template, nullptr,
        TemplateArgs, &DeductionInfo) {}

319Sema::InstantiatingTemplate::InstantiatingTemplate(
  Sema &SemaRef, SourceLocation PointOfInstantiation,
  ClassTemplatePartialSpecializationDecl *PartialSpec,
  ArrayRef<TemplateArgument> TemplateArgs,
  sema::TemplateDeductionInfo &DeductionInfo, SourceRange InstantiationRange)
  : InstantiatingTemplate(
        SemaRef,
        CodeSynthesisContext::DeducedTemplateArgumentSubstitution,
        PointOfInstantiation, InstantiationRange, PartialSpec, nullptr,
        TemplateArgs, &DeductionInfo) {}

330Sema::InstantiatingTemplate::InstantiatingTemplate(
  Sema &SemaRef, SourceLocation PointOfInstantiation,
  VarTemplatePartialSpecializationDecl *PartialSpec,
  ArrayRef<TemplateArgument> TemplateArgs,
  sema::TemplateDeductionInfo &DeductionInfo, SourceRange InstantiationRange)
  : InstantiatingTemplate(
        SemaRef,
        CodeSynthesisContext::DeducedTemplateArgumentSubstitution,
        PointOfInstantiation, InstantiationRange, PartialSpec, nullptr,
        TemplateArgs, &DeductionInfo) {}

341Sema::InstantiatingTemplate::InstantiatingTemplate(
  Sema &SemaRef, SourceLocation PointOfInstantiation, ParmVarDecl *Param,
  ArrayRef<TemplateArgument> TemplateArgs, SourceRange InstantiationRange)
  : InstantiatingTemplate(
        SemaRef,
        CodeSynthesisContext::DefaultFunctionArgumentInstantiation,
        PointOfInstantiation, InstantiationRange, Param, nullptr,
        TemplateArgs) {}

350Sema::InstantiatingTemplate::InstantiatingTemplate(
  Sema &SemaRef, SourceLocation PointOfInstantiation, NamedDecl *Template,
  NonTypeTemplateParmDecl *Param, ArrayRef<TemplateArgument> TemplateArgs,
  SourceRange InstantiationRange)
  : InstantiatingTemplate(
        SemaRef,
        CodeSynthesisContext::PriorTemplateArgumentSubstitution,
        PointOfInstantiation, InstantiationRange, Param, Template,
        TemplateArgs) {}

360Sema::InstantiatingTemplate::InstantiatingTemplate(
  Sema &SemaRef, SourceLocation PointOfInstantiation, NamedDecl *Template,
  TemplateTemplateParmDecl *Param, ArrayRef<TemplateArgument> TemplateArgs,
  SourceRange InstantiationRange)
  : InstantiatingTemplate(
        SemaRef,
        CodeSynthesisContext::PriorTemplateArgumentSubstitution,
        PointOfInstantiation, InstantiationRange, Param, Template,
        TemplateArgs) {}

370Sema::InstantiatingTemplate::InstantiatingTemplate(
  Sema &SemaRef, SourceLocation PointOfInstantiation, TemplateDecl *Template,
  NamedDecl *Param, ArrayRef<TemplateArgument> TemplateArgs,
  SourceRange InstantiationRange)
  : InstantiatingTemplate(
        SemaRef, CodeSynthesisContext::DefaultTemplateArgumentChecking,
        PointOfInstantiation, InstantiationRange, Param, Template,
        TemplateArgs) {}

379Sema::InstantiatingTemplate::InstantiatingTemplate(
  Sema &SemaRef, SourceLocation PointOfInstantiation,
  concepts::Requirement *Req, sema::TemplateDeductionInfo &DeductionInfo,
  SourceRange InstantiationRange)
  : InstantiatingTemplate(
        SemaRef, CodeSynthesisContext::RequirementInstantiation,
        PointOfInstantiation, InstantiationRange, /*Entity=*/nullptr,
        /*Template=*/nullptr, /*TemplateArgs=*/None, &DeductionInfo) {}


389Sema::InstantiatingTemplate::InstantiatingTemplate(
  Sema &SemaRef, SourceLocation PointOfInstantiation,
  concepts::NestedRequirement *Req, ConstraintsCheck,
  SourceRange InstantiationRange)
  : InstantiatingTemplate(
        SemaRef, CodeSynthesisContext::NestedRequirementConstraintsCheck,
        PointOfInstantiation, InstantiationRange, /*Entity=*/nullptr,
        /*Template=*/nullptr, /*TemplateArgs=*/None) {}


399Sema::InstantiatingTemplate::InstantiatingTemplate(
  Sema &SemaRef, SourceLocation PointOfInstantiation,
  ConstraintsCheck, NamedDecl *Template,
  ArrayRef<TemplateArgument> TemplateArgs, SourceRange InstantiationRange)
  : InstantiatingTemplate(
        SemaRef, CodeSynthesisContext::ConstraintsCheck,
        PointOfInstantiation, InstantiationRange, Template, nullptr,
        TemplateArgs) {}

408Sema::InstantiatingTemplate::InstantiatingTemplate(
  Sema &SemaRef, SourceLocation PointOfInstantiation,
  ConstraintSubstitution, NamedDecl *Template,
  sema::TemplateDeductionInfo &DeductionInfo, SourceRange InstantiationRange)
  : InstantiatingTemplate(
        SemaRef, CodeSynthesisContext::ConstraintSubstitution,
        PointOfInstantiation, InstantiationRange, Template, nullptr,
        {}, &DeductionInfo) {}

417Sema::InstantiatingTemplate::InstantiatingTemplate(
  Sema &SemaRef, SourceLocation PointOfInstantiation,
  ConstraintNormalization, NamedDecl *Template,
  SourceRange InstantiationRange)
  : InstantiatingTemplate(
        SemaRef, CodeSynthesisContext::ConstraintNormalization,
        PointOfInstantiation, InstantiationRange, Template) {}

425Sema::InstantiatingTemplate::InstantiatingTemplate(
  Sema &SemaRef, SourceLocation PointOfInstantiation,
  ParameterMappingSubstitution, NamedDecl *Template,
  SourceRange InstantiationRange)
  : InstantiatingTemplate(
        SemaRef, CodeSynthesisContext::ParameterMappingSubstitution,
        PointOfInstantiation, InstantiationRange, Template) {}

433void Sema::pushCodeSynthesisContext(CodeSynthesisContext Ctx) {
Ctx.SavedInNonInstantiationSFINAEContext = InNonInstantiationSFINAEContext;
InNonInstantiationSFINAEContext = false;

CodeSynthesisContexts.push_back(Ctx);

if (!Ctx.isInstantiationRecord())
  ++NonInstantiationEntries;

// Check to see if we're low on stack space. We can't do anything about this
// from here, but we can at least warn the user.
if (isStackNearlyExhausted())
  warnStackExhausted(Ctx.PointOfInstantiation);
446}

448void Sema::popCodeSynthesisContext() {
auto &Active = CodeSynthesisContexts.back();
if (!Active.isInstantiationRecord()) {
  assert(NonInstantiationEntries > 0)((NonInstantiationEntries > 0) ? static_cast<void> (
0) : __assert_fail ("NonInstantiationEntries > 0", "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 451, __PRETTY_FUNCTION__));
  --NonInstantiationEntries;
}

InNonInstantiationSFINAEContext = Active.SavedInNonInstantiationSFINAEContext;

// Name lookup no longer looks in this template's defining module.
assert(CodeSynthesisContexts.size() >=((CodeSynthesisContexts.size() >= CodeSynthesisContextLookupModules
.size() && "forgot to remove a lookup module for a template instantiation"
) ? static_cast<void> (0) : __assert_fail ("CodeSynthesisContexts.size() >= CodeSynthesisContextLookupModules.size() && \"forgot to remove a lookup module for a template instantiation\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 460, __PRETTY_FUNCTION__))
           CodeSynthesisContextLookupModules.size() &&((CodeSynthesisContexts.size() >= CodeSynthesisContextLookupModules
.size() && "forgot to remove a lookup module for a template instantiation"
) ? static_cast<void> (0) : __assert_fail ("CodeSynthesisContexts.size() >= CodeSynthesisContextLookupModules.size() && \"forgot to remove a lookup module for a template instantiation\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 460, __PRETTY_FUNCTION__))
       "forgot to remove a lookup module for a template instantiation")((CodeSynthesisContexts.size() >= CodeSynthesisContextLookupModules
.size() && "forgot to remove a lookup module for a template instantiation"
) ? static_cast<void> (0) : __assert_fail ("CodeSynthesisContexts.size() >= CodeSynthesisContextLookupModules.size() && \"forgot to remove a lookup module for a template instantiation\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 460, __PRETTY_FUNCTION__));
if (CodeSynthesisContexts.size() ==
    CodeSynthesisContextLookupModules.size()) {
  if (Module *M = CodeSynthesisContextLookupModules.back())
    LookupModulesCache.erase(M);
  CodeSynthesisContextLookupModules.pop_back();
}

// If we've left the code synthesis context for the current context stack,
// stop remembering that we've emitted that stack.
if (CodeSynthesisContexts.size() ==
    LastEmittedCodeSynthesisContextDepth)
  LastEmittedCodeSynthesisContextDepth = 0;

CodeSynthesisContexts.pop_back();
475}

477void Sema::InstantiatingTemplate::Clear() {
if (!Invalid) {
  if (!AlreadyInstantiating) {
    auto &Active = SemaRef.CodeSynthesisContexts.back();
    if (Active.Entity)
      SemaRef.InstantiatingSpecializations.erase(
          std::make_pair(Active.Entity, Active.Kind));
  }

  atTemplateEnd(SemaRef.TemplateInstCallbacks, SemaRef,
                SemaRef.CodeSynthesisContexts.back());

  SemaRef.popCodeSynthesisContext();
  Invalid = true;
}
492}

494bool Sema::InstantiatingTemplate::CheckInstantiationDepth(
                                      SourceLocation PointOfInstantiation,
                                         SourceRange InstantiationRange) {
assert(SemaRef.NonInstantiationEntries <=((SemaRef.NonInstantiationEntries <= SemaRef.CodeSynthesisContexts
.size()) ? static_cast<void> (0) : __assert_fail ("SemaRef.NonInstantiationEntries <= SemaRef.CodeSynthesisContexts.size()"
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 498, __PRETTY_FUNCTION__))
38
←
Assuming the condition is true→
39
←
'?' condition is true→
       SemaRef.CodeSynthesisContexts.size())((SemaRef.NonInstantiationEntries <= SemaRef.CodeSynthesisContexts
.size()) ? static_cast<void> (0) : __assert_fail ("SemaRef.NonInstantiationEntries <= SemaRef.CodeSynthesisContexts.size()"
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 498, __PRETTY_FUNCTION__));
if ((SemaRef.CodeSynthesisContexts.size() -
40
←
Assuming the condition is true→
41
←
Taking true branch→
        SemaRef.NonInstantiationEntries)
      <= SemaRef.getLangOpts().InstantiationDepth)
  return false;
42
←
Returning zero, which participates in a condition later→

SemaRef.Diag(PointOfInstantiation,
             diag::err_template_recursion_depth_exceeded)
  << SemaRef.getLangOpts().InstantiationDepth
  << InstantiationRange;
SemaRef.Diag(PointOfInstantiation, diag::note_template_recursion_depth)
  << SemaRef.getLangOpts().InstantiationDepth;
return true;
511}

513/// Prints the current instantiation stack through a series of
514/// notes.
515void Sema::PrintInstantiationStack() {
// Determine which template instantiations to skip, if any.
unsigned SkipStart = CodeSynthesisContexts.size(), SkipEnd = SkipStart;
unsigned Limit = Diags.getTemplateBacktraceLimit();
if (Limit && Limit < CodeSynthesisContexts.size()) {
  SkipStart = Limit / 2 + Limit % 2;
  SkipEnd = CodeSynthesisContexts.size() - Limit / 2;
}

// FIXME: In all of these cases, we need to show the template arguments
unsigned InstantiationIdx = 0;
for (SmallVectorImpl<CodeSynthesisContext>::reverse_iterator
       Active = CodeSynthesisContexts.rbegin(),
       ActiveEnd = CodeSynthesisContexts.rend();
     Active != ActiveEnd;
     ++Active, ++InstantiationIdx) {
  // Skip this instantiation?
  if (InstantiationIdx >= SkipStart && InstantiationIdx < SkipEnd) {
    if (InstantiationIdx == SkipStart) {
      // Note that we're skipping instantiations.
      Diags.Report(Active->PointOfInstantiation,
                   diag::note_instantiation_contexts_suppressed)
        << unsigned(CodeSynthesisContexts.size() - Limit);
    }
    continue;
  }

  switch (Active->Kind) {
  case CodeSynthesisContext::TemplateInstantiation: {
    Decl *D = Active->Entity;
    if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(D)) {
      unsigned DiagID = diag::note_template_member_class_here;
      if (isa<ClassTemplateSpecializationDecl>(Record))
        DiagID = diag::note_template_class_instantiation_here;
      Diags.Report(Active->PointOfInstantiation, DiagID)
        << Record << Active->InstantiationRange;
    } else if (FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) {
      unsigned DiagID;
      if (Function->getPrimaryTemplate())
        DiagID = diag::note_function_template_spec_here;
      else
        DiagID = diag::note_template_member_function_here;
      Diags.Report(Active->PointOfInstantiation, DiagID)
        << Function
        << Active->InstantiationRange;
    } else if (VarDecl *VD = dyn_cast<VarDecl>(D)) {
      Diags.Report(Active->PointOfInstantiation,
                   VD->isStaticDataMember()?
                     diag::note_template_static_data_member_def_here
                   : diag::note_template_variable_def_here)
        << VD
        << Active->InstantiationRange;
    } else if (EnumDecl *ED = dyn_cast<EnumDecl>(D)) {
      Diags.Report(Active->PointOfInstantiation,
                   diag::note_template_enum_def_here)
        << ED
        << Active->InstantiationRange;
    } else if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) {
      Diags.Report(Active->PointOfInstantiation,
                   diag::note_template_nsdmi_here)
          << FD << Active->InstantiationRange;
    } else {
      Diags.Report(Active->PointOfInstantiation,
                   diag::note_template_type_alias_instantiation_here)
        << cast<TypeAliasTemplateDecl>(D)
        << Active->InstantiationRange;
    }
    break;
  }

  case CodeSynthesisContext::DefaultTemplateArgumentInstantiation: {
    TemplateDecl *Template = cast<TemplateDecl>(Active->Template);
    SmallString<128> TemplateArgsStr;
    llvm::raw_svector_ostream OS(TemplateArgsStr);
    Template->printName(OS);
    printTemplateArgumentList(OS, Active->template_arguments(),
                              getPrintingPolicy());
    Diags.Report(Active->PointOfInstantiation,
                 diag::note_default_arg_instantiation_here)
      << OS.str()
      << Active->InstantiationRange;
    break;
  }

  case CodeSynthesisContext::ExplicitTemplateArgumentSubstitution: {
    FunctionTemplateDecl *FnTmpl = cast<FunctionTemplateDecl>(Active->Entity);
    Diags.Report(Active->PointOfInstantiation,
                 diag::note_explicit_template_arg_substitution_here)
      << FnTmpl
      << getTemplateArgumentBindingsText(FnTmpl->getTemplateParameters(),
                                         Active->TemplateArgs,
                                         Active->NumTemplateArgs)
      << Active->InstantiationRange;
    break;
  }

  case CodeSynthesisContext::DeducedTemplateArgumentSubstitution: {
    if (FunctionTemplateDecl *FnTmpl =
            dyn_cast<FunctionTemplateDecl>(Active->Entity)) {
      Diags.Report(Active->PointOfInstantiation,
                   diag::note_function_template_deduction_instantiation_here)
        << FnTmpl
        << getTemplateArgumentBindingsText(FnTmpl->getTemplateParameters(),
                                           Active->TemplateArgs,
                                           Active->NumTemplateArgs)
        << Active->InstantiationRange;
    } else {
      bool IsVar = isa<VarTemplateDecl>(Active->Entity) ||
                   isa<VarTemplateSpecializationDecl>(Active->Entity);
      bool IsTemplate = false;
      TemplateParameterList *Params;
      if (auto *D = dyn_cast<TemplateDecl>(Active->Entity)) {
        IsTemplate = true;
        Params = D->getTemplateParameters();
      } else if (auto *D = dyn_cast<ClassTemplatePartialSpecializationDecl>(
                     Active->Entity)) {
        Params = D->getTemplateParameters();
      } else if (auto *D = dyn_cast<VarTemplatePartialSpecializationDecl>(
                     Active->Entity)) {
        Params = D->getTemplateParameters();
      } else {
        llvm_unreachable("unexpected template kind")::llvm::llvm_unreachable_internal("unexpected template kind",
 "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 636);
      }

      Diags.Report(Active->PointOfInstantiation,
                   diag::note_deduced_template_arg_substitution_here)
        << IsVar << IsTemplate << cast<NamedDecl>(Active->Entity)
        << getTemplateArgumentBindingsText(Params, Active->TemplateArgs,
                                           Active->NumTemplateArgs)
        << Active->InstantiationRange;
    }
    break;
  }

  case CodeSynthesisContext::DefaultFunctionArgumentInstantiation: {
    ParmVarDecl *Param = cast<ParmVarDecl>(Active->Entity);
    FunctionDecl *FD = cast<FunctionDecl>(Param->getDeclContext());

    SmallString<128> TemplateArgsStr;
    llvm::raw_svector_ostream OS(TemplateArgsStr);
    FD->printName(OS);
    printTemplateArgumentList(OS, Active->template_arguments(),
                              getPrintingPolicy());
    Diags.Report(Active->PointOfInstantiation,
                 diag::note_default_function_arg_instantiation_here)
      << OS.str()
      << Active->InstantiationRange;
    break;
  }

  case CodeSynthesisContext::PriorTemplateArgumentSubstitution: {
    NamedDecl *Parm = cast<NamedDecl>(Active->Entity);
    std::string Name;
    if (!Parm->getName().empty())
      Name = std::string(" '") + Parm->getName().str() + "'";

    TemplateParameterList *TemplateParams = nullptr;
    if (TemplateDecl *Template = dyn_cast<TemplateDecl>(Active->Template))
      TemplateParams = Template->getTemplateParameters();
    else
      TemplateParams =
        cast<ClassTemplatePartialSpecializationDecl>(Active->Template)
                                                    ->getTemplateParameters();
    Diags.Report(Active->PointOfInstantiation,
                 diag::note_prior_template_arg_substitution)
      << isa<TemplateTemplateParmDecl>(Parm)
      << Name
      << getTemplateArgumentBindingsText(TemplateParams,
                                         Active->TemplateArgs,
                                         Active->NumTemplateArgs)
      << Active->InstantiationRange;
    break;
  }

  case CodeSynthesisContext::DefaultTemplateArgumentChecking: {
    TemplateParameterList *TemplateParams = nullptr;
    if (TemplateDecl *Template = dyn_cast<TemplateDecl>(Active->Template))
      TemplateParams = Template->getTemplateParameters();
    else
      TemplateParams =
        cast<ClassTemplatePartialSpecializationDecl>(Active->Template)
                                                    ->getTemplateParameters();

    Diags.Report(Active->PointOfInstantiation,
                 diag::note_template_default_arg_checking)
      << getTemplateArgumentBindingsText(TemplateParams,
                                         Active->TemplateArgs,
                                         Active->NumTemplateArgs)
      << Active->InstantiationRange;
    break;
  }

  case CodeSynthesisContext::ExceptionSpecEvaluation:
    Diags.Report(Active->PointOfInstantiation,
                 diag::note_evaluating_exception_spec_here)
        << cast<FunctionDecl>(Active->Entity);
    break;

  case CodeSynthesisContext::ExceptionSpecInstantiation:
    Diags.Report(Active->PointOfInstantiation,
                 diag::note_template_exception_spec_instantiation_here)
      << cast<FunctionDecl>(Active->Entity)
      << Active->InstantiationRange;
    break;

  case CodeSynthesisContext::RequirementInstantiation:
    Diags.Report(Active->PointOfInstantiation,
                 diag::note_template_requirement_instantiation_here)
      << Active->InstantiationRange;
    break;

  case CodeSynthesisContext::NestedRequirementConstraintsCheck:
    Diags.Report(Active->PointOfInstantiation,
                 diag::note_nested_requirement_here)
      << Active->InstantiationRange;
    break;

  case CodeSynthesisContext::DeclaringSpecialMember:
    Diags.Report(Active->PointOfInstantiation,
                 diag::note_in_declaration_of_implicit_special_member)
      << cast<CXXRecordDecl>(Active->Entity) << Active->SpecialMember;
    break;

  case CodeSynthesisContext::DeclaringImplicitEqualityComparison:
    Diags.Report(Active->Entity->getLocation(),
                 diag::note_in_declaration_of_implicit_equality_comparison);
    break;

  case CodeSynthesisContext::DefiningSynthesizedFunction: {
    // FIXME: For synthesized functions that are not defaulted,
    // produce a note.
    auto *FD = dyn_cast<FunctionDecl>(Active->Entity);
    DefaultedFunctionKind DFK =
        FD ? getDefaultedFunctionKind(FD) : DefaultedFunctionKind();
    if (DFK.isSpecialMember()) {
      auto *MD = cast<CXXMethodDecl>(FD);
      Diags.Report(Active->PointOfInstantiation,
                   diag::note_member_synthesized_at)
          << MD->isExplicitlyDefaulted() << DFK.asSpecialMember()
          << Context.getTagDeclType(MD->getParent());
    } else if (DFK.isComparison()) {
      Diags.Report(Active->PointOfInstantiation,
                   diag::note_comparison_synthesized_at)
          << (int)DFK.asComparison()
          << Context.getTagDeclType(
                 cast<CXXRecordDecl>(FD->getLexicalDeclContext()));
    }
    break;
  }

  case CodeSynthesisContext::RewritingOperatorAsSpaceship:
    Diags.Report(Active->Entity->getLocation(),
                 diag::note_rewriting_operator_as_spaceship);
    break;

  case CodeSynthesisContext::InitializingStructuredBinding:
    Diags.Report(Active->PointOfInstantiation,
                 diag::note_in_binding_decl_init)
        << cast<BindingDecl>(Active->Entity);
    break;

  case CodeSynthesisContext::MarkingClassDllexported:
    Diags.Report(Active->PointOfInstantiation,
                 diag::note_due_to_dllexported_class)
        << cast<CXXRecordDecl>(Active->Entity) << !getLangOpts().CPlusPlus11;
    break;

  case CodeSynthesisContext::Memoization:
    break;

  case CodeSynthesisContext::ConstraintsCheck: {
    unsigned DiagID = 0;
    if (!Active->Entity) {
      Diags.Report(Active->PointOfInstantiation,
                   diag::note_nested_requirement_here)
        << Active->InstantiationRange;
      break;
    }
    if (isa<ConceptDecl>(Active->Entity))
      DiagID = diag::note_concept_specialization_here;
    else if (isa<TemplateDecl>(Active->Entity))
      DiagID = diag::note_checking_constraints_for_template_id_here;
    else if (isa<VarTemplatePartialSpecializationDecl>(Active->Entity))
      DiagID = diag::note_checking_constraints_for_var_spec_id_here;
    else if (isa<ClassTemplatePartialSpecializationDecl>(Active->Entity))
      DiagID = diag::note_checking_constraints_for_class_spec_id_here;
    else {
      assert(isa<FunctionDecl>(Active->Entity))((isa<FunctionDecl>(Active->Entity)) ? static_cast<
void> (0) : __assert_fail ("isa<FunctionDecl>(Active->Entity)"
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 802, __PRETTY_FUNCTION__));
      DiagID = diag::note_checking_constraints_for_function_here;
    }
    SmallString<128> TemplateArgsStr;
    llvm::raw_svector_ostream OS(TemplateArgsStr);
    cast<NamedDecl>(Active->Entity)->printName(OS);
    if (!isa<FunctionDecl>(Active->Entity))
      printTemplateArgumentList(OS, Active->template_arguments(),
                                getPrintingPolicy());
    Diags.Report(Active->PointOfInstantiation, DiagID) << OS.str()
      << Active->InstantiationRange;
    break;
  }
  case CodeSynthesisContext::ConstraintSubstitution:
    Diags.Report(Active->PointOfInstantiation,
                 diag::note_constraint_substitution_here)
        << Active->InstantiationRange;
    break;
  case CodeSynthesisContext::ConstraintNormalization:
    Diags.Report(Active->PointOfInstantiation,
                 diag::note_constraint_normalization_here)
        << cast<NamedDecl>(Active->Entity)->getName()
        << Active->InstantiationRange;
    break;
  case CodeSynthesisContext::ParameterMappingSubstitution:
    Diags.Report(Active->PointOfInstantiation,
                 diag::note_parameter_mapping_substitution_here)
        << Active->InstantiationRange;
    break;
  }
}
833}

835Optional<TemplateDeductionInfo *> Sema::isSFINAEContext() const {
if (InNonInstantiationSFINAEContext)
  return Optional<TemplateDeductionInfo *>(nullptr);

for (SmallVectorImpl<CodeSynthesisContext>::const_reverse_iterator
       Active = CodeSynthesisContexts.rbegin(),
       ActiveEnd = CodeSynthesisContexts.rend();
     Active != ActiveEnd;
     ++Active)
{
  switch (Active->Kind) {
  case CodeSynthesisContext::TemplateInstantiation:
    // An instantiation of an alias template may or may not be a SFINAE
    // context, depending on what else is on the stack.
    if (isa<TypeAliasTemplateDecl>(Active->Entity))
      break;
    LLVM_FALLTHROUGH[[gnu::fallthrough]];
  case CodeSynthesisContext::DefaultFunctionArgumentInstantiation:
  case CodeSynthesisContext::ExceptionSpecInstantiation:
  case CodeSynthesisContext::ConstraintsCheck:
  case CodeSynthesisContext::ParameterMappingSubstitution:
  case CodeSynthesisContext::ConstraintNormalization:
  case CodeSynthesisContext::NestedRequirementConstraintsCheck:
    // This is a template instantiation, so there is no SFINAE.
    return None;

  case CodeSynthesisContext::DefaultTemplateArgumentInstantiation:
  case CodeSynthesisContext::PriorTemplateArgumentSubstitution:
  case CodeSynthesisContext::DefaultTemplateArgumentChecking:
  case CodeSynthesisContext::RewritingOperatorAsSpaceship:
    // A default template argument instantiation and substitution into
    // template parameters with arguments for prior parameters may or may
    // not be a SFINAE context; look further up the stack.
    break;

  case CodeSynthesisContext::ExplicitTemplateArgumentSubstitution:
  case CodeSynthesisContext::DeducedTemplateArgumentSubstitution:
  case CodeSynthesisContext::ConstraintSubstitution:
  case CodeSynthesisContext::RequirementInstantiation:
    // We're either substituting explicitly-specified template arguments,
    // deduced template arguments, a constraint expression or a requirement
    // in a requires expression, so SFINAE applies.
    assert(Active->DeductionInfo && "Missing deduction info pointer")((Active->DeductionInfo && "Missing deduction info pointer"
) ? static_cast<void> (0) : __assert_fail ("Active->DeductionInfo && \"Missing deduction info pointer\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 877, __PRETTY_FUNCTION__));
    return Active->DeductionInfo;

  case CodeSynthesisContext::DeclaringSpecialMember:
  case CodeSynthesisContext::DeclaringImplicitEqualityComparison:
  case CodeSynthesisContext::DefiningSynthesizedFunction:
  case CodeSynthesisContext::InitializingStructuredBinding:
  case CodeSynthesisContext::MarkingClassDllexported:
    // This happens in a context unrelated to template instantiation, so
    // there is no SFINAE.
    return None;

  case CodeSynthesisContext::ExceptionSpecEvaluation:
    // FIXME: This should not be treated as a SFINAE context, because
    // we will cache an incorrect exception specification. However, clang
    // bootstrap relies this! See PR31692.
    break;

  case CodeSynthesisContext::Memoization:
    break;
  }

  // The inner context was transparent for SFINAE. If it occurred within a
  // non-instantiation SFINAE context, then SFINAE applies.
  if (Active->SavedInNonInstantiationSFINAEContext)
    return Optional<TemplateDeductionInfo *>(nullptr);
}

return None;
906}

908//===----------------------------------------------------------------------===/
909// Template Instantiation for Types
910//===----------------------------------------------------------------------===/
911namespace {
class TemplateInstantiator : public TreeTransform<TemplateInstantiator> {
  const MultiLevelTemplateArgumentList &TemplateArgs;
  SourceLocation Loc;
  DeclarationName Entity;

public:
  typedef TreeTransform<TemplateInstantiator> inherited;

  TemplateInstantiator(Sema &SemaRef,
                       const MultiLevelTemplateArgumentList &TemplateArgs,
                       SourceLocation Loc,
                       DeclarationName Entity)
    : inherited(SemaRef), TemplateArgs(TemplateArgs), Loc(Loc),
      Entity(Entity) { }

  /// Determine whether the given type \p T has already been
  /// transformed.
  ///
  /// For the purposes of template instantiation, a type has already been
  /// transformed if it is NULL or if it is not dependent.
  bool AlreadyTransformed(QualType T);

  /// Returns the location of the entity being instantiated, if known.
  SourceLocation getBaseLocation() { return Loc; }

  /// Returns the name of the entity being instantiated, if any.
  DeclarationName getBaseEntity() { return Entity; }

  /// Sets the "base" location and entity when that
  /// information is known based on another transformation.
  void setBase(SourceLocation Loc, DeclarationName Entity) {
    this->Loc = Loc;
    this->Entity = Entity;
  }

  unsigned TransformTemplateDepth(unsigned Depth) {
    return TemplateArgs.getNewDepth(Depth);
  }

  bool TryExpandParameterPacks(SourceLocation EllipsisLoc,
                               SourceRange PatternRange,
                               ArrayRef<UnexpandedParameterPack> Unexpanded,
                               bool &ShouldExpand, bool &RetainExpansion,
                               Optional<unsigned> &NumExpansions) {
    return getSema().CheckParameterPacksForExpansion(EllipsisLoc,
                                                     PatternRange, Unexpanded,
                                                     TemplateArgs,
                                                     ShouldExpand,
                                                     RetainExpansion,
                                                     NumExpansions);
  }

  void ExpandingFunctionParameterPack(ParmVarDecl *Pack) {
    SemaRef.CurrentInstantiationScope->MakeInstantiatedLocalArgPack(Pack);
  }

  TemplateArgument ForgetPartiallySubstitutedPack() {
    TemplateArgument Result;
    if (NamedDecl *PartialPack
          = SemaRef.CurrentInstantiationScope->getPartiallySubstitutedPack()){
      MultiLevelTemplateArgumentList &TemplateArgs
        = const_cast<MultiLevelTemplateArgumentList &>(this->TemplateArgs);
      unsigned Depth, Index;
      std::tie(Depth, Index) = getDepthAndIndex(PartialPack);
      if (TemplateArgs.hasTemplateArgument(Depth, Index)) {
        Result = TemplateArgs(Depth, Index);
        TemplateArgs.setArgument(Depth, Index, TemplateArgument());
      }
    }

    return Result;
  }

  void RememberPartiallySubstitutedPack(TemplateArgument Arg) {
    if (Arg.isNull())
      return;

    if (NamedDecl *PartialPack
          = SemaRef.CurrentInstantiationScope->getPartiallySubstitutedPack()){
      MultiLevelTemplateArgumentList &TemplateArgs
      = const_cast<MultiLevelTemplateArgumentList &>(this->TemplateArgs);
      unsigned Depth, Index;
      std::tie(Depth, Index) = getDepthAndIndex(PartialPack);
      TemplateArgs.setArgument(Depth, Index, Arg);
    }
  }

  /// Transform the given declaration by instantiating a reference to
  /// this declaration.
  Decl *TransformDecl(SourceLocation Loc, Decl *D);

  void transformAttrs(Decl *Old, Decl *New) {
    SemaRef.InstantiateAttrs(TemplateArgs, Old, New);
  }

  void transformedLocalDecl(Decl *Old, ArrayRef<Decl *> NewDecls) {
    if (Old->isParameterPack()) {
      SemaRef.CurrentInstantiationScope->MakeInstantiatedLocalArgPack(Old);
      for (auto *New : NewDecls)
        SemaRef.CurrentInstantiationScope->InstantiatedLocalPackArg(
            Old, cast<VarDecl>(New));
      return;
    }

    assert(NewDecls.size() == 1 &&((NewDecls.size() == 1 && "should only have multiple expansions for a pack"
) ? static_cast<void> (0) : __assert_fail ("NewDecls.size() == 1 && \"should only have multiple expansions for a pack\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1017, __PRETTY_FUNCTION__))
           "should only have multiple expansions for a pack")((NewDecls.size() == 1 && "should only have multiple expansions for a pack"
) ? static_cast<void> (0) : __assert_fail ("NewDecls.size() == 1 && \"should only have multiple expansions for a pack\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1017, __PRETTY_FUNCTION__));
    Decl *New = NewDecls.front();

    // If we've instantiated the call operator of a lambda or the call
    // operator template of a generic lambda, update the "instantiation of"
    // information.
    auto *NewMD = dyn_cast<CXXMethodDecl>(New);
    if (NewMD && isLambdaCallOperator(NewMD)) {
      auto *OldMD = dyn_cast<CXXMethodDecl>(Old);
      if (auto *NewTD = NewMD->getDescribedFunctionTemplate())
        NewTD->setInstantiatedFromMemberTemplate(
            OldMD->getDescribedFunctionTemplate());
      else
        NewMD->setInstantiationOfMemberFunction(OldMD,
                                                TSK_ImplicitInstantiation);
    }

    SemaRef.CurrentInstantiationScope->InstantiatedLocal(Old, New);

    // We recreated a local declaration, but not by instantiating it. There
    // may be pending dependent diagnostics to produce.
    if (auto *DC = dyn_cast<DeclContext>(Old))
      SemaRef.PerformDependentDiagnostics(DC, TemplateArgs);
  }

  /// Transform the definition of the given declaration by
  /// instantiating it.
  Decl *TransformDefinition(SourceLocation Loc, Decl *D);

  /// Transform the first qualifier within a scope by instantiating the
  /// declaration.
  NamedDecl *TransformFirstQualifierInScope(NamedDecl *D, SourceLocation Loc);

  /// Rebuild the exception declaration and register the declaration
  /// as an instantiated local.
  VarDecl *RebuildExceptionDecl(VarDecl *ExceptionDecl,
                                TypeSourceInfo *Declarator,
                                SourceLocation StartLoc,
                                SourceLocation NameLoc,
                                IdentifierInfo *Name);

  /// Rebuild the Objective-C exception declaration and register the
  /// declaration as an instantiated local.
  VarDecl *RebuildObjCExceptionDecl(VarDecl *ExceptionDecl,
                                    TypeSourceInfo *TSInfo, QualType T);

  /// Check for tag mismatches when instantiating an
  /// elaborated type.
  QualType RebuildElaboratedType(SourceLocation KeywordLoc,
                                 ElaboratedTypeKeyword Keyword,
                                 NestedNameSpecifierLoc QualifierLoc,
                                 QualType T);

  TemplateName
  TransformTemplateName(CXXScopeSpec &SS, TemplateName Name,
                        SourceLocation NameLoc,
                        QualType ObjectType = QualType(),
                        NamedDecl *FirstQualifierInScope = nullptr,
                        bool AllowInjectedClassName = false);

  const LoopHintAttr *TransformLoopHintAttr(const LoopHintAttr *LH);

  ExprResult TransformPredefinedExpr(PredefinedExpr *E);
  ExprResult TransformDeclRefExpr(DeclRefExpr *E);
  ExprResult TransformCXXDefaultArgExpr(CXXDefaultArgExpr *E);

  ExprResult TransformTemplateParmRefExpr(DeclRefExpr *E,
                                          NonTypeTemplateParmDecl *D);
  ExprResult TransformSubstNonTypeTemplateParmPackExpr(
                                         SubstNonTypeTemplateParmPackExpr *E);
  ExprResult TransformSubstNonTypeTemplateParmExpr(
                                         SubstNonTypeTemplateParmExpr *E);

  /// Rebuild a DeclRefExpr for a VarDecl reference.
  ExprResult RebuildVarDeclRefExpr(VarDecl *PD, SourceLocation Loc);

  /// Transform a reference to a function or init-capture parameter pack.
  ExprResult TransformFunctionParmPackRefExpr(DeclRefExpr *E, VarDecl *PD);

  /// Transform a FunctionParmPackExpr which was built when we couldn't
  /// expand a function parameter pack reference which refers to an expanded
  /// pack.
  ExprResult TransformFunctionParmPackExpr(FunctionParmPackExpr *E);

  QualType TransformFunctionProtoType(TypeLocBuilder &TLB,
                                      FunctionProtoTypeLoc TL) {
    // Call the base version; it will forward to our overridden version below.
    return inherited::TransformFunctionProtoType(TLB, TL);
  }

  template<typename Fn>
  QualType TransformFunctionProtoType(TypeLocBuilder &TLB,
                                      FunctionProtoTypeLoc TL,
                                      CXXRecordDecl *ThisContext,
                                      Qualifiers ThisTypeQuals,
                                      Fn TransformExceptionSpec);

  ParmVarDecl *TransformFunctionTypeParam(ParmVarDecl *OldParm,
                                          int indexAdjustment,
                                          Optional<unsigned> NumExpansions,
                                          bool ExpectParameterPack);

  /// Transforms a template type parameter type by performing
  /// substitution of the corresponding template type argument.
  QualType TransformTemplateTypeParmType(TypeLocBuilder &TLB,
                                         TemplateTypeParmTypeLoc TL);

  /// Transforms an already-substituted template type parameter pack
  /// into either itself (if we aren't substituting into its pack expansion)
  /// or the appropriate substituted argument.
  QualType TransformSubstTemplateTypeParmPackType(TypeLocBuilder &TLB,
                                         SubstTemplateTypeParmPackTypeLoc TL);

  ExprResult TransformLambdaExpr(LambdaExpr *E) {
    LocalInstantiationScope Scope(SemaRef, /*CombineWithOuterScope=*/true);
    return TreeTransform<TemplateInstantiator>::TransformLambdaExpr(E);
  }

  ExprResult TransformRequiresExpr(RequiresExpr *E) {
    LocalInstantiationScope Scope(SemaRef, /*CombineWithOuterScope=*/true);
    return TreeTransform<TemplateInstantiator>::TransformRequiresExpr(E);
  }

  bool TransformRequiresExprRequirements(
      ArrayRef<concepts::Requirement *> Reqs,
      SmallVectorImpl<concepts::Requirement *> &Transformed) {
    bool SatisfactionDetermined = false;
    for (concepts::Requirement *Req : Reqs) {
      concepts::Requirement *TransReq = nullptr;
      if (!SatisfactionDetermined) {
        if (auto *TypeReq = dyn_cast<concepts::TypeRequirement>(Req))
          TransReq = TransformTypeRequirement(TypeReq);
        else if (auto *ExprReq = dyn_cast<concepts::ExprRequirement>(Req))
          TransReq = TransformExprRequirement(ExprReq);
        else
          TransReq = TransformNestedRequirement(
              cast<concepts::NestedRequirement>(Req));
        if (!TransReq)
          return true;
        if (!TransReq->isDependent() && !TransReq->isSatisfied())
          // [expr.prim.req]p6
          //   [...]  The substitution and semantic constraint checking
          //   proceeds in lexical order and stops when a condition that
          //   determines the result of the requires-expression is
          //   encountered. [..]
          SatisfactionDetermined = true;
      } else
        TransReq = Req;
      Transformed.push_back(TransReq);
    }
    return false;
  }

  TemplateParameterList *TransformTemplateParameterList(
                            TemplateParameterList *OrigTPL)  {
    if (!OrigTPL || !OrigTPL->size()) return OrigTPL;

    DeclContext *Owner = OrigTPL->getParam(0)->getDeclContext();
    TemplateDeclInstantiator  DeclInstantiator(getSema(),
                      /* DeclContext *Owner */ Owner, TemplateArgs);
    return DeclInstantiator.SubstTemplateParams(OrigTPL);
  }

  concepts::TypeRequirement *
  TransformTypeRequirement(concepts::TypeRequirement *Req);
  concepts::ExprRequirement *
  TransformExprRequirement(concepts::ExprRequirement *Req);
  concepts::NestedRequirement *
  TransformNestedRequirement(concepts::NestedRequirement *Req);

private:
  ExprResult transformNonTypeTemplateParmRef(NonTypeTemplateParmDecl *parm,
                                             SourceLocation loc,
                                             TemplateArgument arg);
};
1192}

1194bool TemplateInstantiator::AlreadyTransformed(QualType T) {
if (T.isNull())
  return true;

if (T->isInstantiationDependentType() || T->isVariablyModifiedType())
  return false;

getSema().MarkDeclarationsReferencedInType(Loc, T);
return true;
1203}

1205static TemplateArgument
1206getPackSubstitutedTemplateArgument(Sema &S, TemplateArgument Arg) {
assert(S.ArgumentPackSubstitutionIndex >= 0)((S.ArgumentPackSubstitutionIndex >= 0) ? static_cast<void
> (0) : __assert_fail ("S.ArgumentPackSubstitutionIndex >= 0"
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1207, __PRETTY_FUNCTION__));
assert(S.ArgumentPackSubstitutionIndex < (int)Arg.pack_size())((S.ArgumentPackSubstitutionIndex < (int)Arg.pack_size()) ?
 static_cast<void> (0) : __assert_fail ("S.ArgumentPackSubstitutionIndex < (int)Arg.pack_size()"
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1208, __PRETTY_FUNCTION__));
Arg = Arg.pack_begin()[S.ArgumentPackSubstitutionIndex];
if (Arg.isPackExpansion())
  Arg = Arg.getPackExpansionPattern();
return Arg;
1213}

1215Decl *TemplateInstantiator::TransformDecl(SourceLocation Loc, Decl *D) {
if (!D)
  return nullptr;

if (TemplateTemplateParmDecl *TTP = dyn_cast<TemplateTemplateParmDecl>(D)) {
  if (TTP->getDepth() < TemplateArgs.getNumLevels()) {
    // If the corresponding template argument is NULL or non-existent, it's
    // because we are performing instantiation from explicitly-specified
    // template arguments in a function template, but there were some
    // arguments left unspecified.
    if (!TemplateArgs.hasTemplateArgument(TTP->getDepth(),
                                          TTP->getPosition()))
      return D;

    TemplateArgument Arg = TemplateArgs(TTP->getDepth(), TTP->getPosition());

    if (TTP->isParameterPack()) {
      assert(Arg.getKind() == TemplateArgument::Pack &&((Arg.getKind() == TemplateArgument::Pack && "Missing argument pack"
) ? static_cast<void> (0) : __assert_fail ("Arg.getKind() == TemplateArgument::Pack && \"Missing argument pack\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1233, __PRETTY_FUNCTION__))
             "Missing argument pack")((Arg.getKind() == TemplateArgument::Pack && "Missing argument pack"
) ? static_cast<void> (0) : __assert_fail ("Arg.getKind() == TemplateArgument::Pack && \"Missing argument pack\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1233, __PRETTY_FUNCTION__));
      Arg = getPackSubstitutedTemplateArgument(getSema(), Arg);
    }

    TemplateName Template = Arg.getAsTemplate().getNameToSubstitute();
    assert(!Template.isNull() && Template.getAsTemplateDecl() &&((!Template.isNull() && Template.getAsTemplateDecl() &&
 "Wrong kind of template template argument") ? static_cast<
void> (0) : __assert_fail ("!Template.isNull() && Template.getAsTemplateDecl() && \"Wrong kind of template template argument\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1239, __PRETTY_FUNCTION__))
           "Wrong kind of template template argument")((!Template.isNull() && Template.getAsTemplateDecl() &&
 "Wrong kind of template template argument") ? static_cast<
void> (0) : __assert_fail ("!Template.isNull() && Template.getAsTemplateDecl() && \"Wrong kind of template template argument\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1239, __PRETTY_FUNCTION__));
    return Template.getAsTemplateDecl();
  }

  // Fall through to find the instantiated declaration for this template
  // template parameter.
}

return SemaRef.FindInstantiatedDecl(Loc, cast<NamedDecl>(D), TemplateArgs);
1248}

1250Decl *TemplateInstantiator::TransformDefinition(SourceLocation Loc, Decl *D) {
Decl *Inst = getSema().SubstDecl(D, getSema().CurContext, TemplateArgs);
if (!Inst)
  return nullptr;

getSema().CurrentInstantiationScope->InstantiatedLocal(D, Inst);
return Inst;
1257}

1259NamedDecl *
1260TemplateInstantiator::TransformFirstQualifierInScope(NamedDecl *D,
                                                   SourceLocation Loc) {
// If the first part of the nested-name-specifier was a template type
// parameter, instantiate that type parameter down to a tag type.
if (TemplateTypeParmDecl *TTPD = dyn_cast_or_null<TemplateTypeParmDecl>(D)) {
  const TemplateTypeParmType *TTP
    = cast<TemplateTypeParmType>(getSema().Context.getTypeDeclType(TTPD));

  if (TTP->getDepth() < TemplateArgs.getNumLevels()) {
    // FIXME: This needs testing w/ member access expressions.
    TemplateArgument Arg = TemplateArgs(TTP->getDepth(), TTP->getIndex());

    if (TTP->isParameterPack()) {
      assert(Arg.getKind() == TemplateArgument::Pack &&((Arg.getKind() == TemplateArgument::Pack && "Missing argument pack"
) ? static_cast<void> (0) : __assert_fail ("Arg.getKind() == TemplateArgument::Pack && \"Missing argument pack\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1274, __PRETTY_FUNCTION__))
             "Missing argument pack")((Arg.getKind() == TemplateArgument::Pack && "Missing argument pack"
) ? static_cast<void> (0) : __assert_fail ("Arg.getKind() == TemplateArgument::Pack && \"Missing argument pack\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1274, __PRETTY_FUNCTION__));

      if (getSema().ArgumentPackSubstitutionIndex == -1)
        return nullptr;

      Arg = getPackSubstitutedTemplateArgument(getSema(), Arg);
    }

    QualType T = Arg.getAsType();
    if (T.isNull())
      return cast_or_null<NamedDecl>(TransformDecl(Loc, D));

    if (const TagType *Tag = T->getAs<TagType>())
      return Tag->getDecl();

    // The resulting type is not a tag; complain.
    getSema().Diag(Loc, diag::err_nested_name_spec_non_tag) << T;
    return nullptr;
  }
}

return cast_or_null<NamedDecl>(TransformDecl(Loc, D));
1296}

1298VarDecl *
1299TemplateInstantiator::RebuildExceptionDecl(VarDecl *ExceptionDecl,
                                         TypeSourceInfo *Declarator,
                                         SourceLocation StartLoc,
                                         SourceLocation NameLoc,
                                         IdentifierInfo *Name) {
VarDecl *Var = inherited::RebuildExceptionDecl(ExceptionDecl, Declarator,
                                               StartLoc, NameLoc, Name);
if (Var)
  getSema().CurrentInstantiationScope->InstantiatedLocal(ExceptionDecl, Var);
return Var;
1309}

1311VarDecl *TemplateInstantiator::RebuildObjCExceptionDecl(VarDecl *ExceptionDecl,
                                                      TypeSourceInfo *TSInfo,
                                                      QualType T) {
VarDecl *Var = inherited::RebuildObjCExceptionDecl(ExceptionDecl, TSInfo, T);
if (Var)
  getSema().CurrentInstantiationScope->InstantiatedLocal(ExceptionDecl, Var);
return Var;
1318}

1320QualType
1321TemplateInstantiator::RebuildElaboratedType(SourceLocation KeywordLoc,
                                          ElaboratedTypeKeyword Keyword,
                                          NestedNameSpecifierLoc QualifierLoc,
                                          QualType T) {
if (const TagType *TT = T->getAs<TagType>()) {
  TagDecl* TD = TT->getDecl();

  SourceLocation TagLocation = KeywordLoc;

  IdentifierInfo *Id = TD->getIdentifier();

  // TODO: should we even warn on struct/class mismatches for this?  Seems
  // like it's likely to produce a lot of spurious errors.
  if (Id && Keyword != ETK_None && Keyword != ETK_Typename) {
    TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForKeyword(Keyword);
    if (!SemaRef.isAcceptableTagRedeclaration(TD, Kind, /*isDefinition*/false,
                                              TagLocation, Id)) {
      SemaRef.Diag(TagLocation, diag::err_use_with_wrong_tag)
        << Id
        << FixItHint::CreateReplacement(SourceRange(TagLocation),
                                        TD->getKindName());
      SemaRef.Diag(TD->getLocation(), diag::note_previous_use);
    }
  }
}

return TreeTransform<TemplateInstantiator>::RebuildElaboratedType(KeywordLoc,
                                                                  Keyword,
                                                                QualifierLoc,
                                                                  T);
1351}

1353TemplateName TemplateInstantiator::TransformTemplateName(
  CXXScopeSpec &SS, TemplateName Name, SourceLocation NameLoc,
  QualType ObjectType, NamedDecl *FirstQualifierInScope,
  bool AllowInjectedClassName) {
if (TemplateTemplateParmDecl *TTP
     = dyn_cast_or_null<TemplateTemplateParmDecl>(Name.getAsTemplateDecl())) {
  if (TTP->getDepth() < TemplateArgs.getNumLevels()) {
    // If the corresponding template argument is NULL or non-existent, it's
    // because we are performing instantiation from explicitly-specified
    // template arguments in a function template, but there were some
    // arguments left unspecified.
    if (!TemplateArgs.hasTemplateArgument(TTP->getDepth(),
                                          TTP->getPosition()))
      return Name;

    TemplateArgument Arg = TemplateArgs(TTP->getDepth(), TTP->getPosition());

    if (TemplateArgs.isRewrite()) {
      // We're rewriting the template parameter as a reference to another
      // template parameter.
      if (Arg.getKind() == TemplateArgument::Pack) {
        assert(Arg.pack_size() == 1 && Arg.pack_begin()->isPackExpansion() &&((Arg.pack_size() == 1 && Arg.pack_begin()->isPackExpansion
() && "unexpected pack arguments in template rewrite"
) ? static_cast<void> (0) : __assert_fail ("Arg.pack_size() == 1 && Arg.pack_begin()->isPackExpansion() && \"unexpected pack arguments in template rewrite\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1375, __PRETTY_FUNCTION__))
               "unexpected pack arguments in template rewrite")((Arg.pack_size() == 1 && Arg.pack_begin()->isPackExpansion
() && "unexpected pack arguments in template rewrite"
) ? static_cast<void> (0) : __assert_fail ("Arg.pack_size() == 1 && Arg.pack_begin()->isPackExpansion() && \"unexpected pack arguments in template rewrite\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1375, __PRETTY_FUNCTION__));
        Arg = Arg.pack_begin()->getPackExpansionPattern();
      }
      assert(Arg.getKind() == TemplateArgument::Template &&((Arg.getKind() == TemplateArgument::Template && "unexpected nontype template argument kind in template rewrite"
) ? static_cast<void> (0) : __assert_fail ("Arg.getKind() == TemplateArgument::Template && \"unexpected nontype template argument kind in template rewrite\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1379, __PRETTY_FUNCTION__))
             "unexpected nontype template argument kind in template rewrite")((Arg.getKind() == TemplateArgument::Template && "unexpected nontype template argument kind in template rewrite"
) ? static_cast<void> (0) : __assert_fail ("Arg.getKind() == TemplateArgument::Template && \"unexpected nontype template argument kind in template rewrite\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1379, __PRETTY_FUNCTION__));
      return Arg.getAsTemplate();
    }

    if (TTP->isParameterPack()) {
      assert(Arg.getKind() == TemplateArgument::Pack &&((Arg.getKind() == TemplateArgument::Pack && "Missing argument pack"
) ? static_cast<void> (0) : __assert_fail ("Arg.getKind() == TemplateArgument::Pack && \"Missing argument pack\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1385, __PRETTY_FUNCTION__))
             "Missing argument pack")((Arg.getKind() == TemplateArgument::Pack && "Missing argument pack"
) ? static_cast<void> (0) : __assert_fail ("Arg.getKind() == TemplateArgument::Pack && \"Missing argument pack\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1385, __PRETTY_FUNCTION__));

      if (getSema().ArgumentPackSubstitutionIndex == -1) {
        // We have the template argument pack to substitute, but we're not
        // actually expanding the enclosing pack expansion yet. So, just
        // keep the entire argument pack.
        return getSema().Context.getSubstTemplateTemplateParmPack(TTP, Arg);
      }

      Arg = getPackSubstitutedTemplateArgument(getSema(), Arg);
    }

    TemplateName Template = Arg.getAsTemplate().getNameToSubstitute();
    assert(!Template.isNull() && "Null template template argument")((!Template.isNull() && "Null template template argument"
) ? static_cast<void> (0) : __assert_fail ("!Template.isNull() && \"Null template template argument\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1398, __PRETTY_FUNCTION__));
    assert(!Template.getAsQualifiedTemplateName() &&((!Template.getAsQualifiedTemplateName() && "template decl to substitute is qualified?"
) ? static_cast<void> (0) : __assert_fail ("!Template.getAsQualifiedTemplateName() && \"template decl to substitute is qualified?\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1400, __PRETTY_FUNCTION__))
           "template decl to substitute is qualified?")((!Template.getAsQualifiedTemplateName() && "template decl to substitute is qualified?"
) ? static_cast<void> (0) : __assert_fail ("!Template.getAsQualifiedTemplateName() && \"template decl to substitute is qualified?\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1400, __PRETTY_FUNCTION__));

    Template = getSema().Context.getSubstTemplateTemplateParm(TTP, Template);
    return Template;
  }
}

if (SubstTemplateTemplateParmPackStorage *SubstPack
    = Name.getAsSubstTemplateTemplateParmPack()) {
  if (getSema().ArgumentPackSubstitutionIndex == -1)
    return Name;

  TemplateArgument Arg = SubstPack->getArgumentPack();
  Arg = getPackSubstitutedTemplateArgument(getSema(), Arg);
  return Arg.getAsTemplate().getNameToSubstitute();
}

return inherited::TransformTemplateName(SS, Name, NameLoc, ObjectType,
                                        FirstQualifierInScope,
                                        AllowInjectedClassName);
1420}

1422ExprResult
1423TemplateInstantiator::TransformPredefinedExpr(PredefinedExpr *E) {
if (!E->isTypeDependent())
  return E;

return getSema().BuildPredefinedExpr(E->getLocation(), E->getIdentKind());
1428}

1430ExprResult
1431TemplateInstantiator::TransformTemplateParmRefExpr(DeclRefExpr *E,
                                             NonTypeTemplateParmDecl *NTTP) {
// If the corresponding template argument is NULL or non-existent, it's
// because we are performing instantiation from explicitly-specified
// template arguments in a function template, but there were some
// arguments left unspecified.
if (!TemplateArgs.hasTemplateArgument(NTTP->getDepth(),
                                      NTTP->getPosition()))
  return E;

TemplateArgument Arg = TemplateArgs(NTTP->getDepth(), NTTP->getPosition());

if (TemplateArgs.isRewrite()) {
  // We're rewriting the template parameter as a reference to another
  // template parameter.
  if (Arg.getKind() == TemplateArgument::Pack) {
    assert(Arg.pack_size() == 1 && Arg.pack_begin()->isPackExpansion() &&((Arg.pack_size() == 1 && Arg.pack_begin()->isPackExpansion
() && "unexpected pack arguments in template rewrite"
) ? static_cast<void> (0) : __assert_fail ("Arg.pack_size() == 1 && Arg.pack_begin()->isPackExpansion() && \"unexpected pack arguments in template rewrite\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1448, __PRETTY_FUNCTION__))
           "unexpected pack arguments in template rewrite")((Arg.pack_size() == 1 && Arg.pack_begin()->isPackExpansion
() && "unexpected pack arguments in template rewrite"
) ? static_cast<void> (0) : __assert_fail ("Arg.pack_size() == 1 && Arg.pack_begin()->isPackExpansion() && \"unexpected pack arguments in template rewrite\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1448, __PRETTY_FUNCTION__));
    Arg = Arg.pack_begin()->getPackExpansionPattern();
  }
  assert(Arg.getKind() == TemplateArgument::Expression &&((Arg.getKind() == TemplateArgument::Expression && "unexpected nontype template argument kind in template rewrite"
) ? static_cast<void> (0) : __assert_fail ("Arg.getKind() == TemplateArgument::Expression && \"unexpected nontype template argument kind in template rewrite\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1452, __PRETTY_FUNCTION__))
         "unexpected nontype template argument kind in template rewrite")((Arg.getKind() == TemplateArgument::Expression && "unexpected nontype template argument kind in template rewrite"
) ? static_cast<void> (0) : __assert_fail ("Arg.getKind() == TemplateArgument::Expression && \"unexpected nontype template argument kind in template rewrite\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1452, __PRETTY_FUNCTION__));
  // FIXME: This can lead to the same subexpression appearing multiple times
  // in a complete expression.
  return Arg.getAsExpr();
}

if (NTTP->isParameterPack()) {
  assert(Arg.getKind() == TemplateArgument::Pack &&((Arg.getKind() == TemplateArgument::Pack && "Missing argument pack"
) ? static_cast<void> (0) : __assert_fail ("Arg.getKind() == TemplateArgument::Pack && \"Missing argument pack\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1460, __PRETTY_FUNCTION__))
         "Missing argument pack")((Arg.getKind() == TemplateArgument::Pack && "Missing argument pack"
) ? static_cast<void> (0) : __assert_fail ("Arg.getKind() == TemplateArgument::Pack && \"Missing argument pack\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1460, __PRETTY_FUNCTION__));

  if (getSema().ArgumentPackSubstitutionIndex == -1) {
    // We have an argument pack, but we can't select a particular argument
    // out of it yet. Therefore, we'll build an expression to hold on to that
    // argument pack.
    QualType TargetType = SemaRef.SubstType(NTTP->getType(), TemplateArgs,
                                            E->getLocation(),
                                            NTTP->getDeclName());
    if (TargetType.isNull())
      return ExprError();

    QualType ExprType = TargetType.getNonLValueExprType(SemaRef.Context);
    if (TargetType->isRecordType())
      ExprType.addConst();

    return new (SemaRef.Context) SubstNonTypeTemplateParmPackExpr(
        ExprType, TargetType->isReferenceType() ? VK_LValue : VK_RValue, NTTP,
        E->getLocation(), Arg);
  }

  Arg = getPackSubstitutedTemplateArgument(getSema(), Arg);
}

return transformNonTypeTemplateParmRef(NTTP, E->getLocation(), Arg);
1485}

1487const LoopHintAttr *
1488TemplateInstantiator::TransformLoopHintAttr(const LoopHintAttr *LH) {
Expr *TransformedExpr = getDerived().TransformExpr(LH->getValue()).get();

if (TransformedExpr == LH->getValue())
  return LH;

// Generate error if there is a problem with the value.
if (getSema().CheckLoopHintExpr(TransformedExpr, LH->getLocation()))
  return LH;

// Create new LoopHintValueAttr with integral expression in place of the
// non-type template parameter.
return LoopHintAttr::CreateImplicit(getSema().Context, LH->getOption(),
                                    LH->getState(), TransformedExpr, *LH);
1502}

1504ExprResult TemplateInstantiator::transformNonTypeTemplateParmRef(
                                               NonTypeTemplateParmDecl *parm,
                                               SourceLocation loc,
                                               TemplateArgument arg) {
ExprResult result;

// Determine the substituted parameter type. We can usually infer this from
// the template argument, but not always.
auto SubstParamType = [&] {
  QualType T;
  if (parm->isExpandedParameterPack())
    T = parm->getExpansionType(SemaRef.ArgumentPackSubstitutionIndex);
  else
    T = parm->getType();
  if (parm->isParameterPack() && isa<PackExpansionType>(T))
    T = cast<PackExpansionType>(T)->getPattern();
  return SemaRef.SubstType(T, TemplateArgs, loc, parm->getDeclName());
};

bool refParam = false;

// The template argument itself might be an expression, in which case we just
// return that expression. This happens when substituting into an alias
// template.
if (arg.getKind() == TemplateArgument::Expression) {
  Expr *argExpr = arg.getAsExpr();
  result = argExpr;
  if (argExpr->isLValue()) {
    if (argExpr->getType()->isRecordType()) {
      // Check whether the parameter was actually a reference.
      QualType paramType = SubstParamType();
      if (paramType.isNull())
        return ExprError();
      refParam = paramType->isReferenceType();
    } else {
      refParam = true;
    }
  }
} else if (arg.getKind() == TemplateArgument::Declaration ||
           arg.getKind() == TemplateArgument::NullPtr) {
  ValueDecl *VD;
  if (arg.getKind() == TemplateArgument::Declaration) {
    VD = arg.getAsDecl();

    // Find the instantiation of the template argument.  This is
    // required for nested templates.
    VD = cast_or_null<ValueDecl>(
           getSema().FindInstantiatedDecl(loc, VD, TemplateArgs));
    if (!VD)
      return ExprError();
  } else {
    // Propagate NULL template argument.
    VD = nullptr;
  }

  QualType paramType = VD ? arg.getParamTypeForDecl() : arg.getNullPtrType();
  assert(!paramType.isNull() && "type substitution failed for param type")((!paramType.isNull() && "type substitution failed for param type"
) ? static_cast<void> (0) : __assert_fail ("!paramType.isNull() && \"type substitution failed for param type\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1560, __PRETTY_FUNCTION__));
  assert(!paramType->isDependentType() && "param type still dependent")((!paramType->isDependentType() && "param type still dependent"
) ? static_cast<void> (0) : __assert_fail ("!paramType->isDependentType() && \"param type still dependent\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1561, __PRETTY_FUNCTION__));
  result = SemaRef.BuildExpressionFromDeclTemplateArgument(arg, paramType, loc);
  refParam = paramType->isReferenceType();
} else {
  result = SemaRef.BuildExpressionFromIntegralTemplateArgument(arg, loc);
  assert(result.isInvalid() ||((result.isInvalid() || SemaRef.Context.hasSameType(result.get
()->getType(), arg.getIntegralType())) ? static_cast<void
> (0) : __assert_fail ("result.isInvalid() || SemaRef.Context.hasSameType(result.get()->getType(), arg.getIntegralType())"
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1568, __PRETTY_FUNCTION__))
         SemaRef.Context.hasSameType(result.get()->getType(),((result.isInvalid() || SemaRef.Context.hasSameType(result.get
()->getType(), arg.getIntegralType())) ? static_cast<void
> (0) : __assert_fail ("result.isInvalid() || SemaRef.Context.hasSameType(result.get()->getType(), arg.getIntegralType())"
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1568, __PRETTY_FUNCTION__))
                                     arg.getIntegralType()))((result.isInvalid() || SemaRef.Context.hasSameType(result.get
()->getType(), arg.getIntegralType())) ? static_cast<void
> (0) : __assert_fail ("result.isInvalid() || SemaRef.Context.hasSameType(result.get()->getType(), arg.getIntegralType())"
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1568, __PRETTY_FUNCTION__));
}

if (result.isInvalid())
  return ExprError();

Expr *resultExpr = result.get();
return new (SemaRef.Context) SubstNonTypeTemplateParmExpr(
    resultExpr->getType(), resultExpr->getValueKind(), loc, parm, refParam,
    resultExpr);
1578}

1580ExprResult
1581TemplateInstantiator::TransformSubstNonTypeTemplateParmPackExpr(
                                        SubstNonTypeTemplateParmPackExpr *E) {
if (getSema().ArgumentPackSubstitutionIndex == -1) {
  // We aren't expanding the parameter pack, so just return ourselves.
  return E;
}

TemplateArgument Arg = E->getArgumentPack();
Arg = getPackSubstitutedTemplateArgument(getSema(), Arg);
return transformNonTypeTemplateParmRef(E->getParameterPack(),
                                       E->getParameterPackLocation(),
                                       Arg);
1593}

1595ExprResult
1596TemplateInstantiator::TransformSubstNonTypeTemplateParmExpr(
                                        SubstNonTypeTemplateParmExpr *E) {
ExprResult SubstReplacement = TransformExpr(E->getReplacement());
if (SubstReplacement.isInvalid())
  return true;
QualType SubstType = TransformType(E->getParameterType(getSema().Context));
if (SubstType.isNull())
  return true;
// The type may have been previously dependent and not now, which means we
// might have to implicit cast the argument to the new type, for example:
// template<auto T, decltype(T) U>
// concept C = sizeof(U) == 4;
// void foo() requires C<2, 'a'> { }
// When normalizing foo(), we first form the normalized constraints of C:
// AtomicExpr(sizeof(U) == 4,
//            U=SubstNonTypeTemplateParmExpr(Param=U,
//                                           Expr=DeclRef(U),
//                                           Type=decltype(T)))
// Then we substitute T = 2, U = 'a' into the parameter mapping, and need to
// produce:
// AtomicExpr(sizeof(U) == 4,
//            U=SubstNonTypeTemplateParmExpr(Param=U,
//                                           Expr=ImpCast(
//                                               decltype(2),
//                                               SubstNTTPE(Param=U, Expr='a',
//                                                          Type=char)),
//                                           Type=decltype(2)))
// The call to CheckTemplateArgument here produces the ImpCast.
TemplateArgument Converted;
if (SemaRef.CheckTemplateArgument(E->getParameter(), SubstType,
                                  SubstReplacement.get(),
                                  Converted).isInvalid())
  return true;
return transformNonTypeTemplateParmRef(E->getParameter(),
                                       E->getExprLoc(), Converted);
1631}

1633ExprResult TemplateInstantiator::RebuildVarDeclRefExpr(VarDecl *PD,
                                                     SourceLocation Loc) {
DeclarationNameInfo NameInfo(PD->getDeclName(), Loc);
return getSema().BuildDeclarationNameExpr(CXXScopeSpec(), NameInfo, PD);
1637}

1639ExprResult
1640TemplateInstantiator::TransformFunctionParmPackExpr(FunctionParmPackExpr *E) {
if (getSema().ArgumentPackSubstitutionIndex != -1) {
  // We can expand this parameter pack now.
  VarDecl *D = E->getExpansion(getSema().ArgumentPackSubstitutionIndex);
  VarDecl *VD = cast_or_null<VarDecl>(TransformDecl(E->getExprLoc(), D));
  if (!VD)
    return ExprError();
  return RebuildVarDeclRefExpr(VD, E->getExprLoc());
}

QualType T = TransformType(E->getType());
if (T.isNull())
  return ExprError();

// Transform each of the parameter expansions into the corresponding
// parameters in the instantiation of the function decl.
SmallVector<VarDecl *, 8> Vars;
Vars.reserve(E->getNumExpansions());
for (FunctionParmPackExpr::iterator I = E->begin(), End = E->end();
     I != End; ++I) {
  VarDecl *D = cast_or_null<VarDecl>(TransformDecl(E->getExprLoc(), *I));
  if (!D)
    return ExprError();
  Vars.push_back(D);
}

auto *PackExpr =
    FunctionParmPackExpr::Create(getSema().Context, T, E->getParameterPack(),
                                 E->getParameterPackLocation(), Vars);
getSema().MarkFunctionParmPackReferenced(PackExpr);
return PackExpr;
1671}

1673ExprResult
1674TemplateInstantiator::TransformFunctionParmPackRefExpr(DeclRefExpr *E,
                                                     VarDecl *PD) {
typedef LocalInstantiationScope::DeclArgumentPack DeclArgumentPack;
llvm::PointerUnion<Decl *, DeclArgumentPack *> *Found
  = getSema().CurrentInstantiationScope->findInstantiationOf(PD);
assert(Found && "no instantiation for parameter pack")((Found && "no instantiation for parameter pack") ? static_cast
<void> (0) : __assert_fail ("Found && \"no instantiation for parameter pack\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1679, __PRETTY_FUNCTION__));

Decl *TransformedDecl;
if (DeclArgumentPack *Pack = Found->dyn_cast<DeclArgumentPack *>()) {
  // If this is a reference to a function parameter pack which we can
  // substitute but can't yet expand, build a FunctionParmPackExpr for it.
  if (getSema().ArgumentPackSubstitutionIndex == -1) {
    QualType T = TransformType(E->getType());
    if (T.isNull())
      return ExprError();
    auto *PackExpr = FunctionParmPackExpr::Create(getSema().Context, T, PD,
                                                  E->getExprLoc(), *Pack);
    getSema().MarkFunctionParmPackReferenced(PackExpr);
    return PackExpr;
  }

  TransformedDecl = (*Pack)[getSema().ArgumentPackSubstitutionIndex];
} else {
  TransformedDecl = Found->get<Decl*>();
}

// We have either an unexpanded pack or a specific expansion.
return RebuildVarDeclRefExpr(cast<VarDecl>(TransformedDecl), E->getExprLoc());
1702}

1704ExprResult
1705TemplateInstantiator::TransformDeclRefExpr(DeclRefExpr *E) {
NamedDecl *D = E->getDecl();

// Handle references to non-type template parameters and non-type template
// parameter packs.
if (NonTypeTemplateParmDecl *NTTP = dyn_cast<NonTypeTemplateParmDecl>(D)) {
  if (NTTP->getDepth() < TemplateArgs.getNumLevels())
    return TransformTemplateParmRefExpr(E, NTTP);

  // We have a non-type template parameter that isn't fully substituted;
  // FindInstantiatedDecl will find it in the local instantiation scope.
}

// Handle references to function parameter packs.
if (VarDecl *PD = dyn_cast<VarDecl>(D))
  if (PD->isParameterPack())
    return TransformFunctionParmPackRefExpr(E, PD);

return TreeTransform<TemplateInstantiator>::TransformDeclRefExpr(E);
1724}

1726ExprResult TemplateInstantiator::TransformCXXDefaultArgExpr(
  CXXDefaultArgExpr *E) {
assert(!cast<FunctionDecl>(E->getParam()->getDeclContext())->((!cast<FunctionDecl>(E->getParam()->getDeclContext
())-> getDescribedFunctionTemplate() && "Default arg expressions are never formed in dependent cases."
) ? static_cast<void> (0) : __assert_fail ("!cast<FunctionDecl>(E->getParam()->getDeclContext())-> getDescribedFunctionTemplate() && \"Default arg expressions are never formed in dependent cases.\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1730, __PRETTY_FUNCTION__))
           getDescribedFunctionTemplate() &&((!cast<FunctionDecl>(E->getParam()->getDeclContext
())-> getDescribedFunctionTemplate() && "Default arg expressions are never formed in dependent cases."
) ? static_cast<void> (0) : __assert_fail ("!cast<FunctionDecl>(E->getParam()->getDeclContext())-> getDescribedFunctionTemplate() && \"Default arg expressions are never formed in dependent cases.\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1730, __PRETTY_FUNCTION__))
       "Default arg expressions are never formed in dependent cases.")((!cast<FunctionDecl>(E->getParam()->getDeclContext
())-> getDescribedFunctionTemplate() && "Default arg expressions are never formed in dependent cases."
) ? static_cast<void> (0) : __assert_fail ("!cast<FunctionDecl>(E->getParam()->getDeclContext())-> getDescribedFunctionTemplate() && \"Default arg expressions are never formed in dependent cases.\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1730, __PRETTY_FUNCTION__));
return SemaRef.BuildCXXDefaultArgExpr(E->getUsedLocation(),
                         cast<FunctionDecl>(E->getParam()->getDeclContext()),
                                      E->getParam());
1734}

1736template<typename Fn>
1737QualType TemplateInstantiator::TransformFunctionProtoType(TypeLocBuilder &TLB,
                               FunctionProtoTypeLoc TL,
                               CXXRecordDecl *ThisContext,
                               Qualifiers ThisTypeQuals,
                               Fn TransformExceptionSpec) {
// We need a local instantiation scope for this function prototype.
LocalInstantiationScope Scope(SemaRef, /*CombineWithOuterScope=*/true);
return inherited::TransformFunctionProtoType(
    TLB, TL, ThisContext, ThisTypeQuals, TransformExceptionSpec);
1746}

1748ParmVarDecl *
1749TemplateInstantiator::TransformFunctionTypeParam(ParmVarDecl *OldParm,
                                               int indexAdjustment,
                                             Optional<unsigned> NumExpansions,
                                               bool ExpectParameterPack) {
auto NewParm =
    SemaRef.SubstParmVarDecl(OldParm, TemplateArgs, indexAdjustment,
                             NumExpansions, ExpectParameterPack);
if (NewParm && SemaRef.getLangOpts().OpenCL)
  SemaRef.deduceOpenCLAddressSpace(NewParm);
return NewParm;
1759}

1761QualType
1762TemplateInstantiator::TransformTemplateTypeParmType(TypeLocBuilder &TLB,
                                              TemplateTypeParmTypeLoc TL) {
const TemplateTypeParmType *T = TL.getTypePtr();
if (T->getDepth() < TemplateArgs.getNumLevels()) {
  // Replace the template type parameter with its corresponding
  // template argument.

  // If the corresponding template argument is NULL or doesn't exist, it's
  // because we are performing instantiation from explicitly-specified
  // template arguments in a function template class, but there were some
  // arguments left unspecified.
  if (!TemplateArgs.hasTemplateArgument(T->getDepth(), T->getIndex())) {
    TemplateTypeParmTypeLoc NewTL
      = TLB.push<TemplateTypeParmTypeLoc>(TL.getType());
    NewTL.setNameLoc(TL.getNameLoc());
    return TL.getType();
  }

  TemplateArgument Arg = TemplateArgs(T->getDepth(), T->getIndex());

  if (TemplateArgs.isRewrite()) {
    // We're rewriting the template parameter as a reference to another
    // template parameter.
    if (Arg.getKind() == TemplateArgument::Pack) {
      assert(Arg.pack_size() == 1 && Arg.pack_begin()->isPackExpansion() &&((Arg.pack_size() == 1 && Arg.pack_begin()->isPackExpansion
() && "unexpected pack arguments in template rewrite"
) ? static_cast<void> (0) : __assert_fail ("Arg.pack_size() == 1 && Arg.pack_begin()->isPackExpansion() && \"unexpected pack arguments in template rewrite\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1787, __PRETTY_FUNCTION__))
             "unexpected pack arguments in template rewrite")((Arg.pack_size() == 1 && Arg.pack_begin()->isPackExpansion
() && "unexpected pack arguments in template rewrite"
) ? static_cast<void> (0) : __assert_fail ("Arg.pack_size() == 1 && Arg.pack_begin()->isPackExpansion() && \"unexpected pack arguments in template rewrite\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1787, __PRETTY_FUNCTION__));
      Arg = Arg.pack_begin()->getPackExpansionPattern();
    }
    assert(Arg.getKind() == TemplateArgument::Type &&((Arg.getKind() == TemplateArgument::Type && "unexpected nontype template argument kind in template rewrite"
) ? static_cast<void> (0) : __assert_fail ("Arg.getKind() == TemplateArgument::Type && \"unexpected nontype template argument kind in template rewrite\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1791, __PRETTY_FUNCTION__))
           "unexpected nontype template argument kind in template rewrite")((Arg.getKind() == TemplateArgument::Type && "unexpected nontype template argument kind in template rewrite"
) ? static_cast<void> (0) : __assert_fail ("Arg.getKind() == TemplateArgument::Type && \"unexpected nontype template argument kind in template rewrite\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1791, __PRETTY_FUNCTION__));
    QualType NewT = Arg.getAsType();
    assert(isa<TemplateTypeParmType>(NewT) &&((isa<TemplateTypeParmType>(NewT) && "type parm not rewritten to type parm"
) ? static_cast<void> (0) : __assert_fail ("isa<TemplateTypeParmType>(NewT) && \"type parm not rewritten to type parm\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1794, __PRETTY_FUNCTION__))
           "type parm not rewritten to type parm")((isa<TemplateTypeParmType>(NewT) && "type parm not rewritten to type parm"
) ? static_cast<void> (0) : __assert_fail ("isa<TemplateTypeParmType>(NewT) && \"type parm not rewritten to type parm\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1794, __PRETTY_FUNCTION__));
    auto NewTL = TLB.push<TemplateTypeParmTypeLoc>(NewT);
    NewTL.setNameLoc(TL.getNameLoc());
    return NewT;
  }

  if (T->isParameterPack()) {
    assert(Arg.getKind() == TemplateArgument::Pack &&((Arg.getKind() == TemplateArgument::Pack && "Missing argument pack"
) ? static_cast<void> (0) : __assert_fail ("Arg.getKind() == TemplateArgument::Pack && \"Missing argument pack\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1802, __PRETTY_FUNCTION__))
           "Missing argument pack")((Arg.getKind() == TemplateArgument::Pack && "Missing argument pack"
) ? static_cast<void> (0) : __assert_fail ("Arg.getKind() == TemplateArgument::Pack && \"Missing argument pack\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1802, __PRETTY_FUNCTION__));

    if (getSema().ArgumentPackSubstitutionIndex == -1) {
      // We have the template argument pack, but we're not expanding the
      // enclosing pack expansion yet. Just save the template argument
      // pack for later substitution.
      QualType Result
        = getSema().Context.getSubstTemplateTypeParmPackType(T, Arg);
      SubstTemplateTypeParmPackTypeLoc NewTL
        = TLB.push<SubstTemplateTypeParmPackTypeLoc>(Result);
      NewTL.setNameLoc(TL.getNameLoc());
      return Result;
    }

    Arg = getPackSubstitutedTemplateArgument(getSema(), Arg);
  }

  assert(Arg.getKind() == TemplateArgument::Type &&((Arg.getKind() == TemplateArgument::Type && "Template argument kind mismatch"
) ? static_cast<void> (0) : __assert_fail ("Arg.getKind() == TemplateArgument::Type && \"Template argument kind mismatch\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1820, __PRETTY_FUNCTION__))
         "Template argument kind mismatch")((Arg.getKind() == TemplateArgument::Type && "Template argument kind mismatch"
) ? static_cast<void> (0) : __assert_fail ("Arg.getKind() == TemplateArgument::Type && \"Template argument kind mismatch\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1820, __PRETTY_FUNCTION__));

  QualType Replacement = Arg.getAsType();

  // TODO: only do this uniquing once, at the start of instantiation.
  QualType Result
    = getSema().Context.getSubstTemplateTypeParmType(T, Replacement);
  SubstTemplateTypeParmTypeLoc NewTL
    = TLB.push<SubstTemplateTypeParmTypeLoc>(Result);
  NewTL.setNameLoc(TL.getNameLoc());
  return Result;
}

// The template type parameter comes from an inner template (e.g.,
// the template parameter list of a member template inside the
// template we are instantiating). Create a new template type
// parameter with the template "level" reduced by one.
TemplateTypeParmDecl *NewTTPDecl = nullptr;
if (TemplateTypeParmDecl *OldTTPDecl = T->getDecl())
  NewTTPDecl = cast_or_null<TemplateTypeParmDecl>(
                                TransformDecl(TL.getNameLoc(), OldTTPDecl));

QualType Result = getSema().Context.getTemplateTypeParmType(
    T->getDepth() - TemplateArgs.getNumSubstitutedLevels(), T->getIndex(),
    T->isParameterPack(), NewTTPDecl);
TemplateTypeParmTypeLoc NewTL = TLB.push<TemplateTypeParmTypeLoc>(Result);
NewTL.setNameLoc(TL.getNameLoc());
return Result;
1848}

1850QualType
1851TemplateInstantiator::TransformSubstTemplateTypeParmPackType(
                                                          TypeLocBuilder &TLB,
                                       SubstTemplateTypeParmPackTypeLoc TL) {
if (getSema().ArgumentPackSubstitutionIndex == -1) {
  // We aren't expanding the parameter pack, so just return ourselves.
  SubstTemplateTypeParmPackTypeLoc NewTL
    = TLB.push<SubstTemplateTypeParmPackTypeLoc>(TL.getType());
  NewTL.setNameLoc(TL.getNameLoc());
  return TL.getType();
}

TemplateArgument Arg = TL.getTypePtr()->getArgumentPack();
Arg = getPackSubstitutedTemplateArgument(getSema(), Arg);
QualType Result = Arg.getAsType();

Result = getSema().Context.getSubstTemplateTypeParmType(
                                    TL.getTypePtr()->getReplacedParameter(),
                                                        Result);
SubstTemplateTypeParmTypeLoc NewTL
  = TLB.push<SubstTemplateTypeParmTypeLoc>(Result);
NewTL.setNameLoc(TL.getNameLoc());
return Result;
1873}

1875template<typename EntityPrinter>
1876static concepts::Requirement::SubstitutionDiagnostic *
1877createSubstDiag(Sema &S, TemplateDeductionInfo &Info, EntityPrinter Printer) {
SmallString<128> Message;
SourceLocation ErrorLoc;
if (Info.hasSFINAEDiagnostic()) {
  PartialDiagnosticAt PDA(SourceLocation(),
                          PartialDiagnostic::NullDiagnostic{});
  Info.takeSFINAEDiagnostic(PDA);
  PDA.second.EmitToString(S.getDiagnostics(), Message);
  ErrorLoc = PDA.first;
} else {
  ErrorLoc = Info.getLocation();
}
char *MessageBuf = new (S.Context) char[Message.size()];
std::copy(Message.begin(), Message.end(), MessageBuf);
SmallString<128> Entity;
llvm::raw_svector_ostream OS(Entity);
Printer(OS);
char *EntityBuf = new (S.Context) char[Entity.size()];
std::copy(Entity.begin(), Entity.end(), EntityBuf);
return new (S.Context) concepts::Requirement::SubstitutionDiagnostic{
    StringRef(EntityBuf, Entity.size()), ErrorLoc,
    StringRef(MessageBuf, Message.size())};
1899}

1901concepts::TypeRequirement *
1902TemplateInstantiator::TransformTypeRequirement(concepts::TypeRequirement *Req) {
if (!Req->isDependent() && !AlwaysRebuild())
  return Req;
if (Req->isSubstitutionFailure()) {
  if (AlwaysRebuild())
    return RebuildTypeRequirement(
            Req->getSubstitutionDiagnostic());
  return Req;
}

Sema::SFINAETrap Trap(SemaRef);
TemplateDeductionInfo Info(Req->getType()->getTypeLoc().getBeginLoc());
Sema::InstantiatingTemplate TypeInst(SemaRef,
    Req->getType()->getTypeLoc().getBeginLoc(), Req, Info,
    Req->getType()->getTypeLoc().getSourceRange());
if (TypeInst.isInvalid())
  return nullptr;
TypeSourceInfo *TransType = TransformType(Req->getType());
if (!TransType || Trap.hasErrorOccurred())
  return RebuildTypeRequirement(createSubstDiag(SemaRef, Info,
      [&] (llvm::raw_ostream& OS) {
          Req->getType()->getType().print(OS, SemaRef.getPrintingPolicy());
      }));
return RebuildTypeRequirement(TransType);
1926}

1928concepts::ExprRequirement *
1929TemplateInstantiator::TransformExprRequirement(concepts::ExprRequirement *Req) {
if (!Req->isDependent() && !AlwaysRebuild())
  return Req;

Sema::SFINAETrap Trap(SemaRef);
TemplateDeductionInfo Info(Req->getExpr()->getBeginLoc());

llvm::PointerUnion<Expr *, concepts::Requirement::SubstitutionDiagnostic *>
    TransExpr;
if (Req->isExprSubstitutionFailure())
  TransExpr = Req->getExprSubstitutionDiagnostic();
else {
  Sema::InstantiatingTemplate ExprInst(SemaRef, Req->getExpr()->getBeginLoc(),
                                       Req, Info,
                                       Req->getExpr()->getSourceRange());
  if (ExprInst.isInvalid())
    return nullptr;
  ExprResult TransExprRes = TransformExpr(Req->getExpr());
  if (TransExprRes.isInvalid() || Trap.hasErrorOccurred())
    TransExpr = createSubstDiag(SemaRef, Info,
        [&] (llvm::raw_ostream& OS) {
            Req->getExpr()->printPretty(OS, nullptr,
                                        SemaRef.getPrintingPolicy());
        });
  else
    TransExpr = TransExprRes.get();
}

llvm::Optional<concepts::ExprRequirement::ReturnTypeRequirement> TransRetReq;
const auto &RetReq = Req->getReturnTypeRequirement();
if (RetReq.isEmpty())
  TransRetReq.emplace();
else if (RetReq.isSubstitutionFailure())
  TransRetReq.emplace(RetReq.getSubstitutionDiagnostic());
else if (RetReq.isTypeConstraint()) {
  TemplateParameterList *OrigTPL =
      RetReq.getTypeConstraintTemplateParameterList();
  Sema::InstantiatingTemplate TPLInst(SemaRef, OrigTPL->getTemplateLoc(),
                                      Req, Info, OrigTPL->getSourceRange());
  if (TPLInst.isInvalid())
    return nullptr;
  TemplateParameterList *TPL =
      TransformTemplateParameterList(OrigTPL);
  if (!TPL)
    TransRetReq.emplace(createSubstDiag(SemaRef, Info,
        [&] (llvm::raw_ostream& OS) {
            RetReq.getTypeConstraint()->getImmediatelyDeclaredConstraint()
                ->printPretty(OS, nullptr, SemaRef.getPrintingPolicy());
        }));
  else {
    TPLInst.Clear();
    TransRetReq.emplace(TPL);
  }
}
assert(TransRetReq.hasValue() &&((TransRetReq.hasValue() && "All code paths leading here must set TransRetReq"
) ? static_cast<void> (0) : __assert_fail ("TransRetReq.hasValue() && \"All code paths leading here must set TransRetReq\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1984, __PRETTY_FUNCTION__))
       "All code paths leading here must set TransRetReq")((TransRetReq.hasValue() && "All code paths leading here must set TransRetReq"
) ? static_cast<void> (0) : __assert_fail ("TransRetReq.hasValue() && \"All code paths leading here must set TransRetReq\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 1984, __PRETTY_FUNCTION__));
if (Expr *E = TransExpr.dyn_cast<Expr *>())
  return RebuildExprRequirement(E, Req->isSimple(), Req->getNoexceptLoc(),
                                std::move(*TransRetReq));
return RebuildExprRequirement(
    TransExpr.get<concepts::Requirement::SubstitutionDiagnostic *>(),
    Req->isSimple(), Req->getNoexceptLoc(), std::move(*TransRetReq));
1991}

1993concepts::NestedRequirement *
1994TemplateInstantiator::TransformNestedRequirement(
  concepts::NestedRequirement *Req) {
if (!Req->isDependent() && !AlwaysRebuild())
  return Req;
if (Req->isSubstitutionFailure()) {
  if (AlwaysRebuild())
    return RebuildNestedRequirement(
        Req->getSubstitutionDiagnostic());
  return Req;
}
Sema::InstantiatingTemplate ReqInst(SemaRef,
    Req->getConstraintExpr()->getBeginLoc(), Req,
    Sema::InstantiatingTemplate::ConstraintsCheck{},
    Req->getConstraintExpr()->getSourceRange());

ExprResult TransConstraint;
TemplateDeductionInfo Info(Req->getConstraintExpr()->getBeginLoc());
{
  EnterExpressionEvaluationContext ContextRAII(
      SemaRef, Sema::ExpressionEvaluationContext::ConstantEvaluated);
  Sema::SFINAETrap Trap(SemaRef);
  Sema::InstantiatingTemplate ConstrInst(SemaRef,
      Req->getConstraintExpr()->getBeginLoc(), Req, Info,
      Req->getConstraintExpr()->getSourceRange());
  if (ConstrInst.isInvalid())
    return nullptr;
  TransConstraint = TransformExpr(Req->getConstraintExpr());
  if (TransConstraint.isInvalid() || Trap.hasErrorOccurred())
    return RebuildNestedRequirement(createSubstDiag(SemaRef, Info,
        [&] (llvm::raw_ostream& OS) {
            Req->getConstraintExpr()->printPretty(OS, nullptr,
                                                  SemaRef.getPrintingPolicy());
        }));
}
return RebuildNestedRequirement(TransConstraint.get());
2029}


2032/// Perform substitution on the type T with a given set of template
2033/// arguments.
2034///
2035/// This routine substitutes the given template arguments into the
2036/// type T and produces the instantiated type.
2037///
2038/// \param T the type into which the template arguments will be
2039/// substituted. If this type is not dependent, it will be returned
2040/// immediately.
2041///
2042/// \param Args the template arguments that will be
2043/// substituted for the top-level template parameters within T.
2044///
2045/// \param Loc the location in the source code where this substitution
2046/// is being performed. It will typically be the location of the
2047/// declarator (if we're instantiating the type of some declaration)
2048/// or the location of the type in the source code (if, e.g., we're
2049/// instantiating the type of a cast expression).
2050///
2051/// \param Entity the name of the entity associated with a declaration
2052/// being instantiated (if any). May be empty to indicate that there
2053/// is no such entity (if, e.g., this is a type that occurs as part of
2054/// a cast expression) or that the entity has no name (e.g., an
2055/// unnamed function parameter).
2056///
2057/// \param AllowDeducedTST Whether a DeducedTemplateSpecializationType is
2058/// acceptable as the top level type of the result.
2059///
2060/// \returns If the instantiation succeeds, the instantiated
2061/// type. Otherwise, produces diagnostics and returns a NULL type.
2062TypeSourceInfo *Sema::SubstType(TypeSourceInfo *T,
                              const MultiLevelTemplateArgumentList &Args,
                              SourceLocation Loc,
                              DeclarationName Entity,
                              bool AllowDeducedTST) {
assert(!CodeSynthesisContexts.empty() &&((!CodeSynthesisContexts.empty() && "Cannot perform an instantiation without some context on the "
 "instantiation stack") ? static_cast<void> (0) : __assert_fail
 ("!CodeSynthesisContexts.empty() && \"Cannot perform an instantiation without some context on the \" \"instantiation stack\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2069, __PRETTY_FUNCTION__))
       "Cannot perform an instantiation without some context on the "((!CodeSynthesisContexts.empty() && "Cannot perform an instantiation without some context on the "
 "instantiation stack") ? static_cast<void> (0) : __assert_fail
 ("!CodeSynthesisContexts.empty() && \"Cannot perform an instantiation without some context on the \" \"instantiation stack\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2069, __PRETTY_FUNCTION__))
       "instantiation stack")((!CodeSynthesisContexts.empty() && "Cannot perform an instantiation without some context on the "
 "instantiation stack") ? static_cast<void> (0) : __assert_fail
 ("!CodeSynthesisContexts.empty() && \"Cannot perform an instantiation without some context on the \" \"instantiation stack\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2069, __PRETTY_FUNCTION__));

if (!T->getType()->isInstantiationDependentType() &&
    !T->getType()->isVariablyModifiedType())
  return T;

TemplateInstantiator Instantiator(*this, Args, Loc, Entity);
return AllowDeducedTST ? Instantiator.TransformTypeWithDeducedTST(T)
                       : Instantiator.TransformType(T);
2078}

2080TypeSourceInfo *Sema::SubstType(TypeLoc TL,
                              const MultiLevelTemplateArgumentList &Args,
                              SourceLocation Loc,
                              DeclarationName Entity) {
assert(!CodeSynthesisContexts.empty() &&((!CodeSynthesisContexts.empty() && "Cannot perform an instantiation without some context on the "
 "instantiation stack") ? static_cast<void> (0) : __assert_fail
 ("!CodeSynthesisContexts.empty() && \"Cannot perform an instantiation without some context on the \" \"instantiation stack\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2086, __PRETTY_FUNCTION__))
       "Cannot perform an instantiation without some context on the "((!CodeSynthesisContexts.empty() && "Cannot perform an instantiation without some context on the "
 "instantiation stack") ? static_cast<void> (0) : __assert_fail
 ("!CodeSynthesisContexts.empty() && \"Cannot perform an instantiation without some context on the \" \"instantiation stack\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2086, __PRETTY_FUNCTION__))
       "instantiation stack")((!CodeSynthesisContexts.empty() && "Cannot perform an instantiation without some context on the "
 "instantiation stack") ? static_cast<void> (0) : __assert_fail
 ("!CodeSynthesisContexts.empty() && \"Cannot perform an instantiation without some context on the \" \"instantiation stack\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2086, __PRETTY_FUNCTION__));

if (TL.getType().isNull())
  return nullptr;

if (!TL.getType()->isInstantiationDependentType() &&
    !TL.getType()->isVariablyModifiedType()) {
  // FIXME: Make a copy of the TypeLoc data here, so that we can
  // return a new TypeSourceInfo. Inefficient!
  TypeLocBuilder TLB;
  TLB.pushFullCopy(TL);
  return TLB.getTypeSourceInfo(Context, TL.getType());
}

TemplateInstantiator Instantiator(*this, Args, Loc, Entity);
TypeLocBuilder TLB;
TLB.reserve(TL.getFullDataSize());
QualType Result = Instantiator.TransformType(TLB, TL);
if (Result.isNull())
  return nullptr;

return TLB.getTypeSourceInfo(Context, Result);
2108}

2110/// Deprecated form of the above.
2111QualType Sema::SubstType(QualType T,
                       const MultiLevelTemplateArgumentList &TemplateArgs,
                       SourceLocation Loc, DeclarationName Entity) {
assert(!CodeSynthesisContexts.empty() &&((!CodeSynthesisContexts.empty() && "Cannot perform an instantiation without some context on the "
 "instantiation stack") ? static_cast<void> (0) : __assert_fail
 ("!CodeSynthesisContexts.empty() && \"Cannot perform an instantiation without some context on the \" \"instantiation stack\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2116, __PRETTY_FUNCTION__))
       "Cannot perform an instantiation without some context on the "((!CodeSynthesisContexts.empty() && "Cannot perform an instantiation without some context on the "
 "instantiation stack") ? static_cast<void> (0) : __assert_fail
 ("!CodeSynthesisContexts.empty() && \"Cannot perform an instantiation without some context on the \" \"instantiation stack\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2116, __PRETTY_FUNCTION__))
       "instantiation stack")((!CodeSynthesisContexts.empty() && "Cannot perform an instantiation without some context on the "
 "instantiation stack") ? static_cast<void> (0) : __assert_fail
 ("!CodeSynthesisContexts.empty() && \"Cannot perform an instantiation without some context on the \" \"instantiation stack\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2116, __PRETTY_FUNCTION__));

// If T is not a dependent type or a variably-modified type, there
// is nothing to do.
if (!T->isInstantiationDependentType() && !T->isVariablyModifiedType())
  return T;

TemplateInstantiator Instantiator(*this, TemplateArgs, Loc, Entity);
return Instantiator.TransformType(T);
2125}

2127static bool NeedsInstantiationAsFunctionType(TypeSourceInfo *T) {
if (T->getType()->isInstantiationDependentType() ||
    T->getType()->isVariablyModifiedType())
  return true;

TypeLoc TL = T->getTypeLoc().IgnoreParens();
if (!TL.getAs<FunctionProtoTypeLoc>())
  return false;

FunctionProtoTypeLoc FP = TL.castAs<FunctionProtoTypeLoc>();
for (ParmVarDecl *P : FP.getParams()) {
  // This must be synthesized from a typedef.
  if (!P) continue;

  // If there are any parameters, a new TypeSourceInfo that refers to the
  // instantiated parameters must be built.
  return true;
}

return false;
2147}

2149/// A form of SubstType intended specifically for instantiating the
2150/// type of a FunctionDecl.  Its purpose is solely to force the
2151/// instantiation of default-argument expressions and to avoid
2152/// instantiating an exception-specification.
2153TypeSourceInfo *Sema::SubstFunctionDeclType(TypeSourceInfo *T,
                              const MultiLevelTemplateArgumentList &Args,
                              SourceLocation Loc,
                              DeclarationName Entity,
                              CXXRecordDecl *ThisContext,
                              Qualifiers ThisTypeQuals) {
assert(!CodeSynthesisContexts.empty() &&((!CodeSynthesisContexts.empty() && "Cannot perform an instantiation without some context on the "
 "instantiation stack") ? static_cast<void> (0) : __assert_fail
 ("!CodeSynthesisContexts.empty() && \"Cannot perform an instantiation without some context on the \" \"instantiation stack\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2161, __PRETTY_FUNCTION__))
       "Cannot perform an instantiation without some context on the "((!CodeSynthesisContexts.empty() && "Cannot perform an instantiation without some context on the "
 "instantiation stack") ? static_cast<void> (0) : __assert_fail
 ("!CodeSynthesisContexts.empty() && \"Cannot perform an instantiation without some context on the \" \"instantiation stack\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2161, __PRETTY_FUNCTION__))
       "instantiation stack")((!CodeSynthesisContexts.empty() && "Cannot perform an instantiation without some context on the "
 "instantiation stack") ? static_cast<void> (0) : __assert_fail
 ("!CodeSynthesisContexts.empty() && \"Cannot perform an instantiation without some context on the \" \"instantiation stack\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2161, __PRETTY_FUNCTION__));

if (!NeedsInstantiationAsFunctionType(T))
  return T;

TemplateInstantiator Instantiator(*this, Args, Loc, Entity);

TypeLocBuilder TLB;

TypeLoc TL = T->getTypeLoc();
TLB.reserve(TL.getFullDataSize());

QualType Result;

if (FunctionProtoTypeLoc Proto =
        TL.IgnoreParens().getAs<FunctionProtoTypeLoc>()) {
  // Instantiate the type, other than its exception specification. The
  // exception specification is instantiated in InitFunctionInstantiation
  // once we've built the FunctionDecl.
  // FIXME: Set the exception specification to EST_Uninstantiated here,
  // instead of rebuilding the function type again later.
  Result = Instantiator.TransformFunctionProtoType(
      TLB, Proto, ThisContext, ThisTypeQuals,
      [](FunctionProtoType::ExceptionSpecInfo &ESI,
         bool &Changed) { return false; });
} else {
  Result = Instantiator.TransformType(TLB, TL);
}
if (Result.isNull())
  return nullptr;

return TLB.getTypeSourceInfo(Context, Result);
2193}

2195bool Sema::SubstExceptionSpec(SourceLocation Loc,
                            FunctionProtoType::ExceptionSpecInfo &ESI,
                            SmallVectorImpl<QualType> &ExceptionStorage,
                            const MultiLevelTemplateArgumentList &Args) {
assert(ESI.Type != EST_Uninstantiated)((ESI.Type != EST_Uninstantiated) ? static_cast<void> (
0) : __assert_fail ("ESI.Type != EST_Uninstantiated", "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2199, __PRETTY_FUNCTION__));

bool Changed = false;
TemplateInstantiator Instantiator(*this, Args, Loc, DeclarationName());
return Instantiator.TransformExceptionSpec(Loc, ESI, ExceptionStorage,
                                           Changed);
2205}

2207void Sema::SubstExceptionSpec(FunctionDecl *New, const FunctionProtoType *Proto,
                            const MultiLevelTemplateArgumentList &Args) {
FunctionProtoType::ExceptionSpecInfo ESI =
    Proto->getExtProtoInfo().ExceptionSpec;

SmallVector<QualType, 4> ExceptionStorage;
if (SubstExceptionSpec(New->getTypeSourceInfo()->getTypeLoc().getEndLoc(),
                       ESI, ExceptionStorage, Args))
  // On error, recover by dropping the exception specification.
  ESI.Type = EST_None;

UpdateExceptionSpec(New, ESI);
2219}

2221namespace {

struct GetContainedInventedTypeParmVisitor :
  public TypeVisitor<GetContainedInventedTypeParmVisitor,
                     TemplateTypeParmDecl *> {
  using TypeVisitor<GetContainedInventedTypeParmVisitor,
                    TemplateTypeParmDecl *>::Visit;

  TemplateTypeParmDecl *Visit(QualType T) {
    if (T.isNull())
      return nullptr;
    return Visit(T.getTypePtr());
  }
  // The deduced type itself.
  TemplateTypeParmDecl *VisitTemplateTypeParmType(
      const TemplateTypeParmType *T) {
    if (!T->getDecl() || !T->getDecl()->isImplicit())
      return nullptr;
    return T->getDecl();
  }

  // Only these types can contain 'auto' types, and subsequently be replaced
  // by references to invented parameters.

  TemplateTypeParmDecl *VisitElaboratedType(const ElaboratedType *T) {
    return Visit(T->getNamedType());
  }

  TemplateTypeParmDecl *VisitPointerType(const PointerType *T) {
    return Visit(T->getPointeeType());
  }

  TemplateTypeParmDecl *VisitBlockPointerType(const BlockPointerType *T) {
    return Visit(T->getPointeeType());
  }

  TemplateTypeParmDecl *VisitReferenceType(const ReferenceType *T) {
    return Visit(T->getPointeeTypeAsWritten());
  }

  TemplateTypeParmDecl *VisitMemberPointerType(const MemberPointerType *T) {
    return Visit(T->getPointeeType());
  }

  TemplateTypeParmDecl *VisitArrayType(const ArrayType *T) {
    return Visit(T->getElementType());
  }

  TemplateTypeParmDecl *VisitDependentSizedExtVectorType(
    const DependentSizedExtVectorType *T) {
    return Visit(T->getElementType());
  }

  TemplateTypeParmDecl *VisitVectorType(const VectorType *T) {
    return Visit(T->getElementType());
  }

  TemplateTypeParmDecl *VisitFunctionProtoType(const FunctionProtoType *T) {
    return VisitFunctionType(T);
  }

  TemplateTypeParmDecl *VisitFunctionType(const FunctionType *T) {
    return Visit(T->getReturnType());
  }

  TemplateTypeParmDecl *VisitParenType(const ParenType *T) {
    return Visit(T->getInnerType());
  }

  TemplateTypeParmDecl *VisitAttributedType(const AttributedType *T) {
    return Visit(T->getModifiedType());
  }

  TemplateTypeParmDecl *VisitMacroQualifiedType(const MacroQualifiedType *T) {
    return Visit(T->getUnderlyingType());
  }

  TemplateTypeParmDecl *VisitAdjustedType(const AdjustedType *T) {
    return Visit(T->getOriginalType());
  }

  TemplateTypeParmDecl *VisitPackExpansionType(const PackExpansionType *T) {
    return Visit(T->getPattern());
  }
};

2307} // namespace

2309ParmVarDecl *Sema::SubstParmVarDecl(ParmVarDecl *OldParm,
                          const MultiLevelTemplateArgumentList &TemplateArgs,
                                  int indexAdjustment,
                                  Optional<unsigned> NumExpansions,
                                  bool ExpectParameterPack) {
TypeSourceInfo *OldDI = OldParm->getTypeSourceInfo();
TypeSourceInfo *NewDI = nullptr;

TypeLoc OldTL = OldDI->getTypeLoc();
if (PackExpansionTypeLoc ExpansionTL = OldTL.getAs<PackExpansionTypeLoc>()) {

  // We have a function parameter pack. Substitute into the pattern of the
  // expansion.
  NewDI = SubstType(ExpansionTL.getPatternLoc(), TemplateArgs,
                    OldParm->getLocation(), OldParm->getDeclName());
  if (!NewDI)
    return nullptr;

  if (NewDI->getType()->containsUnexpandedParameterPack()) {
    // We still have unexpanded parameter packs, which means that
    // our function parameter is still a function parameter pack.
    // Therefore, make its type a pack expansion type.
    NewDI = CheckPackExpansion(NewDI, ExpansionTL.getEllipsisLoc(),
                               NumExpansions);
  } else if (ExpectParameterPack) {
    // We expected to get a parameter pack but didn't (because the type
    // itself is not a pack expansion type), so complain. This can occur when
    // the substitution goes through an alias template that "loses" the
    // pack expansion.
    Diag(OldParm->getLocation(),
         diag::err_function_parameter_pack_without_parameter_packs)
      << NewDI->getType();
    return nullptr;
  }
} else {
  NewDI = SubstType(OldDI, TemplateArgs, OldParm->getLocation(),
                    OldParm->getDeclName());
}

if (!NewDI)
  return nullptr;

if (NewDI->getType()->isVoidType()) {
  Diag(OldParm->getLocation(), diag::err_param_with_void_type);
  return nullptr;
}

// In abbreviated templates, TemplateTypeParmDecls with possible
// TypeConstraints are created when the parameter list is originally parsed.
// The TypeConstraints can therefore reference other functions parameters in
// the abbreviated function template, which is why we must instantiate them
// here, when the instantiated versions of those referenced parameters are in
// scope.
if (TemplateTypeParmDecl *TTP =
        GetContainedInventedTypeParmVisitor().Visit(OldDI->getType())) {
  if (const TypeConstraint *TC = TTP->getTypeConstraint()) {
    auto *Inst = cast_or_null<TemplateTypeParmDecl>(
        FindInstantiatedDecl(TTP->getLocation(), TTP, TemplateArgs));
    // We will first get here when instantiating the abbreviated function
    // template's described function, but we might also get here later.
    // Make sure we do not instantiate the TypeConstraint more than once.
    if (Inst && !Inst->getTypeConstraint()) {
      // TODO: Concepts: do not instantiate the constraint (delayed constraint
      // substitution)
      const ASTTemplateArgumentListInfo *TemplArgInfo
        = TC->getTemplateArgsAsWritten();
      TemplateArgumentListInfo InstArgs;

      if (TemplArgInfo) {
        InstArgs.setLAngleLoc(TemplArgInfo->LAngleLoc);
        InstArgs.setRAngleLoc(TemplArgInfo->RAngleLoc);
        if (Subst(TemplArgInfo->getTemplateArgs(),
                  TemplArgInfo->NumTemplateArgs, InstArgs, TemplateArgs))
          return nullptr;
      }
      if (AttachTypeConstraint(
              TC->getNestedNameSpecifierLoc(), TC->getConceptNameInfo(),
              TC->getNamedConcept(), &InstArgs, Inst,
              TTP->isParameterPack()
                  ? cast<CXXFoldExpr>(TC->getImmediatelyDeclaredConstraint())
                      ->getEllipsisLoc()
                  : SourceLocation()))
        return nullptr;
    }
  }
}

ParmVarDecl *NewParm = CheckParameter(Context.getTranslationUnitDecl(),
                                      OldParm->getInnerLocStart(),
                                      OldParm->getLocation(),
                                      OldParm->getIdentifier(),
                                      NewDI->getType(), NewDI,
                                      OldParm->getStorageClass());
if (!NewParm)
  return nullptr;

// Mark the (new) default argument as uninstantiated (if any).
if (OldParm->hasUninstantiatedDefaultArg()) {
  Expr *Arg = OldParm->getUninstantiatedDefaultArg();
  NewParm->setUninstantiatedDefaultArg(Arg);
} else if (OldParm->hasUnparsedDefaultArg()) {
  NewParm->setUnparsedDefaultArg();
  UnparsedDefaultArgInstantiations[OldParm].push_back(NewParm);
} else if (Expr *Arg = OldParm->getDefaultArg()) {
  FunctionDecl *OwningFunc = cast<FunctionDecl>(OldParm->getDeclContext());
  if (OwningFunc->isInLocalScopeForInstantiation()) {
    // Instantiate default arguments for methods of local classes (DR1484)
    // and non-defining declarations.
    Sema::ContextRAII SavedContext(*this, OwningFunc);
    LocalInstantiationScope Local(*this, true);
    ExprResult NewArg = SubstExpr(Arg, TemplateArgs);
    if (NewArg.isUsable()) {
      // It would be nice if we still had this.
      SourceLocation EqualLoc = NewArg.get()->getBeginLoc();
      ExprResult Result =
          ConvertParamDefaultArgument(NewParm, NewArg.get(), EqualLoc);
      if (Result.isInvalid())
        return nullptr;

      SetParamDefaultArgument(NewParm, Result.getAs<Expr>(), EqualLoc);
    }
  } else {
    // FIXME: if we non-lazily instantiated non-dependent default args for
    // non-dependent parameter types we could remove a bunch of duplicate
    // conversion warnings for such arguments.
    NewParm->setUninstantiatedDefaultArg(Arg);
  }
}

NewParm->setHasInheritedDefaultArg(OldParm->hasInheritedDefaultArg());

if (OldParm->isParameterPack() && !NewParm->isParameterPack()) {
  // Add the new parameter to the instantiated parameter pack.
  CurrentInstantiationScope->InstantiatedLocalPackArg(OldParm, NewParm);
} else {
  // Introduce an Old -> New mapping
  CurrentInstantiationScope->InstantiatedLocal(OldParm, NewParm);
}

// FIXME: OldParm may come from a FunctionProtoType, in which case CurContext
// can be anything, is this right ?
NewParm->setDeclContext(CurContext);

NewParm->setScopeInfo(OldParm->getFunctionScopeDepth(),
                      OldParm->getFunctionScopeIndex() + indexAdjustment);

InstantiateAttrs(TemplateArgs, OldParm, NewParm);

return NewParm;
2458}

2460/// Substitute the given template arguments into the given set of
2461/// parameters, producing the set of parameter types that would be generated
2462/// from such a substitution.
2463bool Sema::SubstParmTypes(
  SourceLocation Loc, ArrayRef<ParmVarDecl *> Params,
  const FunctionProtoType::ExtParameterInfo *ExtParamInfos,
  const MultiLevelTemplateArgumentList &TemplateArgs,
  SmallVectorImpl<QualType> &ParamTypes,
  SmallVectorImpl<ParmVarDecl *> *OutParams,
  ExtParameterInfoBuilder &ParamInfos) {
assert(!CodeSynthesisContexts.empty() &&((!CodeSynthesisContexts.empty() && "Cannot perform an instantiation without some context on the "
 "instantiation stack") ? static_cast<void> (0) : __assert_fail
 ("!CodeSynthesisContexts.empty() && \"Cannot perform an instantiation without some context on the \" \"instantiation stack\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2472, __PRETTY_FUNCTION__))
       "Cannot perform an instantiation without some context on the "((!CodeSynthesisContexts.empty() && "Cannot perform an instantiation without some context on the "
 "instantiation stack") ? static_cast<void> (0) : __assert_fail
 ("!CodeSynthesisContexts.empty() && \"Cannot perform an instantiation without some context on the \" \"instantiation stack\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2472, __PRETTY_FUNCTION__))
       "instantiation stack")((!CodeSynthesisContexts.empty() && "Cannot perform an instantiation without some context on the "
 "instantiation stack") ? static_cast<void> (0) : __assert_fail
 ("!CodeSynthesisContexts.empty() && \"Cannot perform an instantiation without some context on the \" \"instantiation stack\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2472, __PRETTY_FUNCTION__));

TemplateInstantiator Instantiator(*this, TemplateArgs, Loc,
                                  DeclarationName());
return Instantiator.TransformFunctionTypeParams(
    Loc, Params, nullptr, ExtParamInfos, ParamTypes, OutParams, ParamInfos);
2478}

2480/// Perform substitution on the base class specifiers of the
2481/// given class template specialization.
2482///
2483/// Produces a diagnostic and returns true on error, returns false and
2484/// attaches the instantiated base classes to the class template
2485/// specialization if successful.
2486bool
2487Sema::SubstBaseSpecifiers(CXXRecordDecl *Instantiation,
                        CXXRecordDecl *Pattern,
                        const MultiLevelTemplateArgumentList &TemplateArgs) {
bool Invalid = false;
SmallVector<CXXBaseSpecifier*, 4> InstantiatedBases;
for (const auto &Base : Pattern->bases()) {
  if (!Base.getType()->isDependentType()) {
    if (const CXXRecordDecl *RD = Base.getType()->getAsCXXRecordDecl()) {
      if (RD->isInvalidDecl())
        Instantiation->setInvalidDecl();
    }
    InstantiatedBases.push_back(new (Context) CXXBaseSpecifier(Base));
    continue;
  }

  SourceLocation EllipsisLoc;
  TypeSourceInfo *BaseTypeLoc;
  if (Base.isPackExpansion()) {
    // This is a pack expansion. See whether we should expand it now, or
    // wait until later.
    SmallVector<UnexpandedParameterPack, 2> Unexpanded;
    collectUnexpandedParameterPacks(Base.getTypeSourceInfo()->getTypeLoc(),
                                    Unexpanded);
    bool ShouldExpand = false;
    bool RetainExpansion = false;
    Optional<unsigned> NumExpansions;
    if (CheckParameterPacksForExpansion(Base.getEllipsisLoc(),
                                        Base.getSourceRange(),
                                        Unexpanded,
                                        TemplateArgs, ShouldExpand,
                                        RetainExpansion,
                                        NumExpansions)) {
      Invalid = true;
      continue;
    }

    // If we should expand this pack expansion now, do so.
    if (ShouldExpand) {
      for (unsigned I = 0; I != *NumExpansions; ++I) {
          Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(*this, I);

        TypeSourceInfo *BaseTypeLoc = SubstType(Base.getTypeSourceInfo(),
                                                TemplateArgs,
                                            Base.getSourceRange().getBegin(),
                                                DeclarationName());
        if (!BaseTypeLoc) {
          Invalid = true;
          continue;
        }

        if (CXXBaseSpecifier *InstantiatedBase
              = CheckBaseSpecifier(Instantiation,
                                   Base.getSourceRange(),
                                   Base.isVirtual(),
                                   Base.getAccessSpecifierAsWritten(),
                                   BaseTypeLoc,
                                   SourceLocation()))
          InstantiatedBases.push_back(InstantiatedBase);
        else
          Invalid = true;
      }

      continue;
    }

    // The resulting base specifier will (still) be a pack expansion.
    EllipsisLoc = Base.getEllipsisLoc();
    Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(*this, -1);
    BaseTypeLoc = SubstType(Base.getTypeSourceInfo(),
                            TemplateArgs,
                            Base.getSourceRange().getBegin(),
                            DeclarationName());
  } else {
    BaseTypeLoc = SubstType(Base.getTypeSourceInfo(),
                            TemplateArgs,
                            Base.getSourceRange().getBegin(),
                            DeclarationName());
  }

  if (!BaseTypeLoc) {
    Invalid = true;
    continue;
  }

  if (CXXBaseSpecifier *InstantiatedBase
        = CheckBaseSpecifier(Instantiation,
                             Base.getSourceRange(),
                             Base.isVirtual(),
                             Base.getAccessSpecifierAsWritten(),
                             BaseTypeLoc,
                             EllipsisLoc))
    InstantiatedBases.push_back(InstantiatedBase);
  else
    Invalid = true;
}

if (!Invalid && AttachBaseSpecifiers(Instantiation, InstantiatedBases))
  Invalid = true;

return Invalid;
2587}

2589// Defined via #include from SemaTemplateInstantiateDecl.cpp
2590namespace clang {
namespace sema {
  Attr *instantiateTemplateAttribute(const Attr *At, ASTContext &C, Sema &S,
                          const MultiLevelTemplateArgumentList &TemplateArgs);
  Attr *instantiateTemplateAttributeForDecl(
      const Attr *At, ASTContext &C, Sema &S,
      const MultiLevelTemplateArgumentList &TemplateArgs);
}
2598}

2600/// Instantiate the definition of a class from a given pattern.
2601///
2602/// \param PointOfInstantiation The point of instantiation within the
2603/// source code.
2604///
2605/// \param Instantiation is the declaration whose definition is being
2606/// instantiated. This will be either a class template specialization
2607/// or a member class of a class template specialization.
2608///
2609/// \param Pattern is the pattern from which the instantiation
2610/// occurs. This will be either the declaration of a class template or
2611/// the declaration of a member class of a class template.
2612///
2613/// \param TemplateArgs The template arguments to be substituted into
2614/// the pattern.
2615///
2616/// \param TSK the kind of implicit or explicit instantiation to perform.
2617///
2618/// \param Complain whether to complain if the class cannot be instantiated due
2619/// to the lack of a definition.
2620///
2621/// \returns true if an error occurred, false otherwise.
2622bool
2623Sema::InstantiateClass(SourceLocation PointOfInstantiation,
                     CXXRecordDecl *Instantiation, CXXRecordDecl *Pattern,
                     const MultiLevelTemplateArgumentList &TemplateArgs,
                     TemplateSpecializationKind TSK,
                     bool Complain) {
CXXRecordDecl *PatternDef
  = cast_or_null<CXXRecordDecl>(Pattern->getDefinition());
27
←
Assuming the object is a 'CXXRecordDecl'→
if (DiagnoseUninstantiableTemplate(PointOfInstantiation, Instantiation,
28
←
Assuming the condition is false→
29
←
Taking false branch→
                              Instantiation->getInstantiatedFromMemberClass(),
                                   Pattern, PatternDef, TSK, Complain))
  return true;

llvm::TimeTraceScope TimeScope("InstantiateClass", [&]() {
  std::string Name;
  llvm::raw_string_ostream OS(Name);
  Instantiation->getNameForDiagnostic(OS, getPrintingPolicy(),
                                      /*Qualified=*/true);
  return Name;
});

Pattern = PatternDef;

// Record the point of instantiation.
if (MemberSpecializationInfo *MSInfo
30
←
Assuming 'MSInfo' is null→
31
←
Taking false branch→
      = Instantiation->getMemberSpecializationInfo()) {
  MSInfo->setTemplateSpecializationKind(TSK);
  MSInfo->setPointOfInstantiation(PointOfInstantiation);
} else if (ClassTemplateSpecializationDecl *Spec32.1
'Spec' is null

32.1	'Spec' is null

←

Taking false branch

→

2651 = dyn_cast<ClassTemplateSpecializationDecl>(Instantiation)) {

←

Assuming 'Instantiation' is not a 'ClassTemplateSpecializationDecl'

→

2652 Spec->setTemplateSpecializationKind(TSK); 2653 Spec->setPointOfInstantiation(PointOfInstantiation); 2654 } 2655 2656 InstantiatingTemplate Inst(*this, PointOfInstantiation, Instantiation);

←

Calling constructor for 'InstantiatingTemplate'

→

←

Returning from constructor for 'InstantiatingTemplate'

→

2657 if (Inst.isInvalid())

←

Calling 'InstantiatingTemplate::isInvalid'

→

←

Returning from 'InstantiatingTemplate::isInvalid'

→

←

Taking false branch

→

2658 return true; 2659 assert(!Inst.isAlreadyInstantiating() && "should have been caught by caller")((!Inst.isAlreadyInstantiating() && "should have been caught by caller"
) ? static_cast<void> (0) : __assert_fail ("!Inst.isAlreadyInstantiating() && \"should have been caught by caller\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2659, __PRETTY_FUNCTION__));

←

'?' condition is true

→

2660 PrettyDeclStackTraceEntry CrashInfo(Context, Instantiation, SourceLocation(), 2661 "instantiating class definition"); 2662 2663 // Enter the scope of this instantiation. We don't use 2664 // PushDeclContext because we don't have a scope. 2665 ContextRAII SavedContext(*this, Instantiation); 2666 EnterExpressionEvaluationContext EvalContext( 2667 *this, Sema::ExpressionEvaluationContext::PotentiallyEvaluated); 2668 2669 // If this is an instantiation of a local class, merge this local 2670 // instantiation scope with the enclosing scope. Otherwise, every 2671 // instantiation of a class has its own local instantiation scope. 2672 bool MergeWithParentScope = !Instantiation->isDefinedOutsideFunctionOrMethod(); 2673 LocalInstantiationScope Scope(*this, MergeWithParentScope); 2674 2675 // Some class state isn't processed immediately but delayed till class 2676 // instantiation completes. We may not be ready to handle any delayed state 2677 // already on the stack as it might correspond to a different class, so save 2678 // it now and put it back later. 2679 SavePendingParsedClassStateRAII SavedPendingParsedClassState(*this); 2680 2681 // Pull attributes from the pattern onto the instantiation. 2682 InstantiateAttrs(TemplateArgs, Pattern, Instantiation); 2683 2684 // Start the definition of this instantiation. 2685 Instantiation->startDefinition(); 2686 2687 // The instantiation is visible here, even if it was first declared in an 2688 // unimported module. 2689 Instantiation->setVisibleDespiteOwningModule(); 2690 2691 // FIXME: This loses the as-written tag kind for an explicit instantiation. 2692 Instantiation->setTagKind(Pattern->getTagKind()); 2693 2694 // Do substitution on the base class specifiers. 2695 if (SubstBaseSpecifiers(Instantiation, Pattern, TemplateArgs))

←

Taking false branch

→

2696 Instantiation->setInvalidDecl(); 2697 2698 TemplateDeclInstantiator Instantiator(*this, Instantiation, TemplateArgs); 2699 SmallVector<Decl*, 4> Fields; 2700 // Delay instantiation of late parsed attributes. 2701 LateInstantiatedAttrVec LateAttrs; 2702 Instantiator.enableLateAttributeInstantiation(&LateAttrs); 2703 2704 bool MightHaveConstexprVirtualFunctions = false; 2705 for (auto *Member : Pattern->decls()) { 2706 // Don't instantiate members not belonging in this semantic context. 2707 // e.g. for: 2708 // @code 2709 // template <int i> class A { 2710 // class B *g; 2711 // }; 2712 // @endcode 2713 // 'class B' has the template as lexical context but semantically it is 2714 // introduced in namespace scope. 2715 if (Member->getDeclContext() != Pattern) 2716 continue; 2717 2718 // BlockDecls can appear in a default-member-initializer. They must be the 2719 // child of a BlockExpr, so we only know how to instantiate them from there. 2720 // Similarly, lambda closure types are recreated when instantiating the 2721 // corresponding LambdaExpr. 2722 if (isa<BlockDecl>(Member) || 2723 (isa<CXXRecordDecl>(Member) && cast<CXXRecordDecl>(Member)->isLambda())) 2724 continue; 2725 2726 if (Member->isInvalidDecl()) { 2727 Instantiation->setInvalidDecl(); 2728 continue; 2729 } 2730 2731 Decl *NewMember = Instantiator.Visit(Member); 2732 if (NewMember) { 2733 if (FieldDecl *Field = dyn_cast<FieldDecl>(NewMember)) { 2734 Fields.push_back(Field); 2735 } else if (EnumDecl *Enum = dyn_cast<EnumDecl>(NewMember)) { 2736 // C++11 [temp.inst]p1: The implicit instantiation of a class template 2737 // specialization causes the implicit instantiation of the definitions 2738 // of unscoped member enumerations. 2739 // Record a point of instantiation for this implicit instantiation. 2740 if (TSK == TSK_ImplicitInstantiation && !Enum->isScoped() && 2741 Enum->isCompleteDefinition()) { 2742 MemberSpecializationInfo *MSInfo =Enum->getMemberSpecializationInfo(); 2743 assert(MSInfo && "no spec info for member enum specialization")((MSInfo && "no spec info for member enum specialization"
) ? static_cast<void> (0) : __assert_fail ("MSInfo && \"no spec info for member enum specialization\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2743, __PRETTY_FUNCTION__)); 2744 MSInfo->setTemplateSpecializationKind(TSK_ImplicitInstantiation); 2745 MSInfo->setPointOfInstantiation(PointOfInstantiation); 2746 } 2747 } else if (StaticAssertDecl *SA = dyn_cast<StaticAssertDecl>(NewMember)) { 2748 if (SA->isFailed()) { 2749 // A static_assert failed. Bail out; instantiating this 2750 // class is probably not meaningful. 2751 Instantiation->setInvalidDecl(); 2752 break; 2753 } 2754 } else if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewMember)) { 2755 if (MD->isConstexpr() && !MD->getFriendObjectKind() && 2756 (MD->isVirtualAsWritten() || Instantiation->getNumBases())) 2757 MightHaveConstexprVirtualFunctions = true; 2758 } 2759 2760 if (NewMember->isInvalidDecl()) 2761 Instantiation->setInvalidDecl(); 2762 } else { 2763 // FIXME: Eventually, a NULL return will mean that one of the 2764 // instantiations was a semantic disaster, and we'll want to mark the 2765 // declaration invalid. 2766 // For now, we expect to skip some members that we can't yet handle. 2767 } 2768 } 2769 2770 // Finish checking fields. 2771 ActOnFields(nullptr, Instantiation->getLocation(), Instantiation, Fields, 2772 SourceLocation(), SourceLocation(), ParsedAttributesView()); 2773 CheckCompletedCXXClass(nullptr, Instantiation); 2774 2775 // Default arguments are parsed, if not instantiated. We can go instantiate 2776 // default arg exprs for default constructors if necessary now. Unless we're 2777 // parsing a class, in which case wait until that's finished. 2778 if (ParsingClassDepth == 0)

←

Assuming field 'ParsingClassDepth' is not equal to 0

→

←

Taking false branch

→

2779 ActOnFinishCXXNonNestedClass(); 2780 2781 // Instantiate late parsed attributes, and attach them to their decls. 2782 // See Sema::InstantiateAttrs 2783 for (LateInstantiatedAttrVec::iterator I = LateAttrs.begin(),

←

Loop condition is true. Entering loop body

→

2784 E = LateAttrs.end(); I != E; ++I) {

←

Assuming 'I' is not equal to 'E'

→

2785 assert(CurrentInstantiationScope == Instantiator.getStartingScope())((CurrentInstantiationScope == Instantiator.getStartingScope(
)) ? static_cast<void> (0) : __assert_fail ("CurrentInstantiationScope == Instantiator.getStartingScope()"
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2785, __PRETTY_FUNCTION__));

←

Assuming the condition is true

→

←

'?' condition is true

→

2786 CurrentInstantiationScope = I->Scope; 2787 2788 // Allow 'this' within late-parsed attributes. 2789 NamedDecl *ND = dyn_cast<NamedDecl>(I->NewDecl);

←

Assuming field 'NewDecl' is not a 'NamedDecl'

→

←

'ND' initialized to a null pointer value

→

2790 CXXRecordDecl *ThisContext = 2791 dyn_cast_or_null<CXXRecordDecl>(ND->getDeclContext());

←

Called C++ object pointer is null

2792 CXXThisScopeRAII ThisScope(*this, ThisContext, Qualifiers(), 2793 ND && ND->isCXXInstanceMember()); 2794 2795 Attr *NewAttr = 2796 instantiateTemplateAttribute(I->TmplAttr, Context, *this, TemplateArgs); 2797 I->NewDecl->addAttr(NewAttr); 2798 LocalInstantiationScope::deleteScopes(I->Scope, 2799 Instantiator.getStartingScope()); 2800 } 2801 Instantiator.disableLateAttributeInstantiation(); 2802 LateAttrs.clear(); 2803 2804 ActOnFinishDelayedMemberInitializers(Instantiation); 2805 2806 // FIXME: We should do something similar for explicit instantiations so they 2807 // end up in the right module. 2808 if (TSK == TSK_ImplicitInstantiation) { 2809 Instantiation->setLocation(Pattern->getLocation()); 2810 Instantiation->setLocStart(Pattern->getInnerLocStart()); 2811 Instantiation->setBraceRange(Pattern->getBraceRange()); 2812 } 2813 2814 if (!Instantiation->isInvalidDecl()) { 2815 // Perform any dependent diagnostics from the pattern. 2816 PerformDependentDiagnostics(Pattern, TemplateArgs); 2817 2818 // Instantiate any out-of-line class template partial 2819 // specializations now. 2820 for (TemplateDeclInstantiator::delayed_partial_spec_iterator 2821 P = Instantiator.delayed_partial_spec_begin(), 2822 PEnd = Instantiator.delayed_partial_spec_end(); 2823 P != PEnd; ++P) { 2824 if (!Instantiator.InstantiateClassTemplatePartialSpecialization( 2825 P->first, P->second)) { 2826 Instantiation->setInvalidDecl(); 2827 break; 2828 } 2829 } 2830 2831 // Instantiate any out-of-line variable template partial 2832 // specializations now. 2833 for (TemplateDeclInstantiator::delayed_var_partial_spec_iterator 2834 P = Instantiator.delayed_var_partial_spec_begin(), 2835 PEnd = Instantiator.delayed_var_partial_spec_end(); 2836 P != PEnd; ++P) { 2837 if (!Instantiator.InstantiateVarTemplatePartialSpecialization( 2838 P->first, P->second)) { 2839 Instantiation->setInvalidDecl(); 2840 break; 2841 } 2842 } 2843 } 2844 2845 // Exit the scope of this instantiation. 2846 SavedContext.pop(); 2847 2848 if (!Instantiation->isInvalidDecl()) { 2849 Consumer.HandleTagDeclDefinition(Instantiation); 2850 2851 // Always emit the vtable for an explicit instantiation definition 2852 // of a polymorphic class template specialization. Otherwise, eagerly 2853 // instantiate only constexpr virtual functions in preparation for their use 2854 // in constant evaluation. 2855 if (TSK == TSK_ExplicitInstantiationDefinition) 2856 MarkVTableUsed(PointOfInstantiation, Instantiation, true); 2857 else if (MightHaveConstexprVirtualFunctions) 2858 MarkVirtualMembersReferenced(PointOfInstantiation, Instantiation, 2859 /*ConstexprOnly*/ true); 2860 } 2861 2862 return Instantiation->isInvalidDecl(); 2863} 2864 2865/// Instantiate the definition of an enum from a given pattern. 2866/// 2867/// \param PointOfInstantiation The point of instantiation within the 2868/// source code. 2869/// \param Instantiation is the declaration whose definition is being 2870/// instantiated. This will be a member enumeration of a class 2871/// temploid specialization, or a local enumeration within a 2872/// function temploid specialization. 2873/// \param Pattern The templated declaration from which the instantiation 2874/// occurs. 2875/// \param TemplateArgs The template arguments to be substituted into 2876/// the pattern. 2877/// \param TSK The kind of implicit or explicit instantiation to perform. 2878/// 2879/// \return \c true if an error occurred, \c false otherwise. 2880bool Sema::InstantiateEnum(SourceLocation PointOfInstantiation, 2881 EnumDecl *Instantiation, EnumDecl *Pattern, 2882 const MultiLevelTemplateArgumentList &TemplateArgs, 2883 TemplateSpecializationKind TSK) { 2884 EnumDecl *PatternDef = Pattern->getDefinition(); 2885 if (DiagnoseUninstantiableTemplate(PointOfInstantiation, Instantiation, 2886 Instantiation->getInstantiatedFromMemberEnum(), 2887 Pattern, PatternDef, TSK,/*Complain*/true)) 2888 return true; 2889 Pattern = PatternDef; 2890 2891 // Record the point of instantiation. 2892 if (MemberSpecializationInfo *MSInfo 2893 = Instantiation->getMemberSpecializationInfo()) { 2894 MSInfo->setTemplateSpecializationKind(TSK); 2895 MSInfo->setPointOfInstantiation(PointOfInstantiation); 2896 } 2897 2898 InstantiatingTemplate Inst(*this, PointOfInstantiation, Instantiation); 2899 if (Inst.isInvalid()) 2900 return true; 2901 if (Inst.isAlreadyInstantiating()) 2902 return false; 2903 PrettyDeclStackTraceEntry CrashInfo(Context, Instantiation, SourceLocation(), 2904 "instantiating enum definition"); 2905 2906 // The instantiation is visible here, even if it was first declared in an 2907 // unimported module. 2908 Instantiation->setVisibleDespiteOwningModule(); 2909 2910 // Enter the scope of this instantiation. We don't use 2911 // PushDeclContext because we don't have a scope. 2912 ContextRAII SavedContext(*this, Instantiation); 2913 EnterExpressionEvaluationContext EvalContext( 2914 *this, Sema::ExpressionEvaluationContext::PotentiallyEvaluated); 2915 2916 LocalInstantiationScope Scope(*this, /*MergeWithParentScope*/true); 2917 2918 // Pull attributes from the pattern onto the instantiation. 2919 InstantiateAttrs(TemplateArgs, Pattern, Instantiation); 2920 2921 TemplateDeclInstantiator Instantiator(*this, Instantiation, TemplateArgs); 2922 Instantiator.InstantiateEnumDefinition(Instantiation, Pattern); 2923 2924 // Exit the scope of this instantiation. 2925 SavedContext.pop(); 2926 2927 return Instantiation->isInvalidDecl(); 2928} 2929 2930 2931/// Instantiate the definition of a field from the given pattern. 2932/// 2933/// \param PointOfInstantiation The point of instantiation within the 2934/// source code. 2935/// \param Instantiation is the declaration whose definition is being 2936/// instantiated. This will be a class of a class temploid 2937/// specialization, or a local enumeration within a function temploid 2938/// specialization. 2939/// \param Pattern The templated declaration from which the instantiation 2940/// occurs. 2941/// \param TemplateArgs The template arguments to be substituted into 2942/// the pattern. 2943/// 2944/// \return \c true if an error occurred, \c false otherwise. 2945bool Sema::InstantiateInClassInitializer( 2946 SourceLocation PointOfInstantiation, FieldDecl *Instantiation, 2947 FieldDecl *Pattern, const MultiLevelTemplateArgumentList &TemplateArgs) { 2948 // If there is no initializer, we don't need to do anything. 2949 if (!Pattern->hasInClassInitializer()) 2950 return false; 2951 2952 assert(Instantiation->getInClassInitStyle() ==((Instantiation->getInClassInitStyle() == Pattern->getInClassInitStyle
() && "pattern and instantiation disagree about init style"
) ? static_cast<void> (0) : __assert_fail ("Instantiation->getInClassInitStyle() == Pattern->getInClassInitStyle() && \"pattern and instantiation disagree about init style\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2954, __PRETTY_FUNCTION__)) 2953 Pattern->getInClassInitStyle() &&((Instantiation->getInClassInitStyle() == Pattern->getInClassInitStyle
() && "pattern and instantiation disagree about init style"
) ? static_cast<void> (0) : __assert_fail ("Instantiation->getInClassInitStyle() == Pattern->getInClassInitStyle() && \"pattern and instantiation disagree about init style\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2954, __PRETTY_FUNCTION__)) 2954 "pattern and instantiation disagree about init style")((Instantiation->getInClassInitStyle() == Pattern->getInClassInitStyle
() && "pattern and instantiation disagree about init style"
) ? static_cast<void> (0) : __assert_fail ("Instantiation->getInClassInitStyle() == Pattern->getInClassInitStyle() && \"pattern and instantiation disagree about init style\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2954, __PRETTY_FUNCTION__)); 2955 2956 // Error out if we haven't parsed the initializer of the pattern yet because 2957 // we are waiting for the closing brace of the outer class. 2958 Expr *OldInit = Pattern->getInClassInitializer(); 2959 if (!OldInit) { 2960 RecordDecl *PatternRD = Pattern->getParent(); 2961 RecordDecl *OutermostClass = PatternRD->getOuterLexicalRecordContext(); 2962 Diag(PointOfInstantiation, 2963 diag::err_default_member_initializer_not_yet_parsed) 2964 << OutermostClass << Pattern; 2965 Diag(Pattern->getEndLoc(), 2966 diag::note_default_member_initializer_not_yet_parsed); 2967 Instantiation->setInvalidDecl(); 2968 return true; 2969 } 2970 2971 InstantiatingTemplate Inst(*this, PointOfInstantiation, Instantiation); 2972 if (Inst.isInvalid()) 2973 return true; 2974 if (Inst.isAlreadyInstantiating()) { 2975 // Error out if we hit an instantiation cycle for this initializer. 2976 Diag(PointOfInstantiation, diag::err_default_member_initializer_cycle) 2977 << Instantiation; 2978 return true; 2979 } 2980 PrettyDeclStackTraceEntry CrashInfo(Context, Instantiation, SourceLocation(), 2981 "instantiating default member init"); 2982 2983 // Enter the scope of this instantiation. We don't use PushDeclContext because 2984 // we don't have a scope. 2985 ContextRAII SavedContext(*this, Instantiation->getParent()); 2986 EnterExpressionEvaluationContext EvalContext( 2987 *this, Sema::ExpressionEvaluationContext::PotentiallyEvaluated); 2988 2989 LocalInstantiationScope Scope(*this, true); 2990 2991 // Instantiate the initializer. 2992 ActOnStartCXXInClassMemberInitializer(); 2993 CXXThisScopeRAII ThisScope(*this, Instantiation->getParent(), Qualifiers()); 2994 2995 ExprResult NewInit = SubstInitializer(OldInit, TemplateArgs, 2996 /*CXXDirectInit=*/false); 2997 Expr *Init = NewInit.get(); 2998 assert((!Init || !isa<ParenListExpr>(Init)) && "call-style init in class")(((!Init || !isa<ParenListExpr>(Init)) && "call-style init in class"
) ? static_cast<void> (0) : __assert_fail ("(!Init || !isa<ParenListExpr>(Init)) && \"call-style init in class\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 2998, __PRETTY_FUNCTION__)); 2999 ActOnFinishCXXInClassMemberInitializer( 3000 Instantiation, Init ? Init->getBeginLoc() : SourceLocation(), Init); 3001 3002 if (auto *L = getASTMutationListener()) 3003 L->DefaultMemberInitializerInstantiated(Instantiation); 3004 3005 // Return true if the in-class initializer is still missing. 3006 return !Instantiation->getInClassInitializer(); 3007} 3008 3009namespace { 3010 /// A partial specialization whose template arguments have matched 3011 /// a given template-id. 3012 struct PartialSpecMatchResult { 3013 ClassTemplatePartialSpecializationDecl *Partial; 3014 TemplateArgumentList *Args; 3015 }; 3016} 3017 3018bool Sema::usesPartialOrExplicitSpecialization( 3019 SourceLocation Loc, ClassTemplateSpecializationDecl *ClassTemplateSpec) { 3020 if (ClassTemplateSpec->getTemplateSpecializationKind() == 3021 TSK_ExplicitSpecialization) 3022 return true; 3023 3024 SmallVector<ClassTemplatePartialSpecializationDecl *, 4> PartialSpecs; 3025 ClassTemplateSpec->getSpecializedTemplate() 3026 ->getPartialSpecializations(PartialSpecs); 3027 for (unsigned I = 0, N = PartialSpecs.size(); I != N; ++I) { 3028 TemplateDeductionInfo Info(Loc); 3029 if (!DeduceTemplateArguments(PartialSpecs[I], 3030 ClassTemplateSpec->getTemplateArgs(), Info)) 3031 return true; 3032 } 3033 3034 return false; 3035} 3036 3037/// Get the instantiation pattern to use to instantiate the definition of a 3038/// given ClassTemplateSpecializationDecl (either the pattern of the primary 3039/// template or of a partial specialization). 3040static CXXRecordDecl * 3041getPatternForClassTemplateSpecialization( 3042 Sema &S, SourceLocation PointOfInstantiation, 3043 ClassTemplateSpecializationDecl *ClassTemplateSpec, 3044 TemplateSpecializationKind TSK, bool Complain) { 3045 Sema::InstantiatingTemplate Inst(S, PointOfInstantiation, ClassTemplateSpec); 3046 if (Inst.isInvalid() || Inst.isAlreadyInstantiating()) 3047 return nullptr; 3048 3049 llvm::PointerUnion<ClassTemplateDecl *, 3050 ClassTemplatePartialSpecializationDecl *> 3051 Specialized = ClassTemplateSpec->getSpecializedTemplateOrPartial(); 3052 if (!Specialized.is<ClassTemplatePartialSpecializationDecl *>()) { 3053 // Find best matching specialization. 3054 ClassTemplateDecl *Template = ClassTemplateSpec->getSpecializedTemplate(); 3055 3056 // C++ [temp.class.spec.match]p1: 3057 // When a class template is used in a context that requires an 3058 // instantiation of the class, it is necessary to determine 3059 // whether the instantiation is to be generated using the primary 3060 // template or one of the partial specializations. This is done by 3061 // matching the template arguments of the class template 3062 // specialization with the template argument lists of the partial 3063 // specializations. 3064 typedef PartialSpecMatchResult MatchResult; 3065 SmallVector<MatchResult, 4> Matched; 3066 SmallVector<ClassTemplatePartialSpecializationDecl *, 4> PartialSpecs; 3067 Template->getPartialSpecializations(PartialSpecs); 3068 TemplateSpecCandidateSet FailedCandidates(PointOfInstantiation); 3069 for (unsigned I = 0, N = PartialSpecs.size(); I != N; ++I) { 3070 ClassTemplatePartialSpecializationDecl *Partial = PartialSpecs[I]; 3071 TemplateDeductionInfo Info(FailedCandidates.getLocation()); 3072 if (Sema::TemplateDeductionResult Result = S.DeduceTemplateArguments( 3073 Partial, ClassTemplateSpec->getTemplateArgs(), Info)) { 3074 // Store the failed-deduction information for use in diagnostics, later. 3075 // TODO: Actually use the failed-deduction info? 3076 FailedCandidates.addCandidate().set( 3077 DeclAccessPair::make(Template, AS_public), Partial, 3078 MakeDeductionFailureInfo(S.Context, Result, Info)); 3079 (void)Result; 3080 } else { 3081 Matched.push_back(PartialSpecMatchResult()); 3082 Matched.back().Partial = Partial; 3083 Matched.back().Args = Info.take(); 3084 } 3085 } 3086 3087 // If we're dealing with a member template where the template parameters 3088 // have been instantiated, this provides the original template parameters 3089 // from which the member template's parameters were instantiated. 3090 3091 if (Matched.size() >= 1) { 3092 SmallVectorImpl<MatchResult>::iterator Best = Matched.begin(); 3093 if (Matched.size() == 1) { 3094 // -- If exactly one matching specialization is found, the 3095 // instantiation is generated from that specialization. 3096 // We don't need to do anything for this. 3097 } else { 3098 // -- If more than one matching specialization is found, the 3099 // partial order rules (14.5.4.2) are used to determine 3100 // whether one of the specializations is more specialized 3101 // than the others. If none of the specializations is more 3102 // specialized than all of the other matching 3103 // specializations, then the use of the class template is 3104 // ambiguous and the program is ill-formed. 3105 for (SmallVectorImpl<MatchResult>::iterator P = Best + 1, 3106 PEnd = Matched.end(); 3107 P != PEnd; ++P) { 3108 if (S.getMoreSpecializedPartialSpecialization( 3109 P->Partial, Best->Partial, PointOfInstantiation) == 3110 P->Partial) 3111 Best = P; 3112 } 3113 3114 // Determine if the best partial specialization is more specialized than 3115 // the others. 3116 bool Ambiguous = false; 3117 for (SmallVectorImpl<MatchResult>::iterator P = Matched.begin(), 3118 PEnd = Matched.end(); 3119 P != PEnd; ++P) { 3120 if (P != Best && S.getMoreSpecializedPartialSpecialization( 3121 P->Partial, Best->Partial, 3122 PointOfInstantiation) != Best->Partial) { 3123 Ambiguous = true; 3124 break; 3125 } 3126 } 3127 3128 if (Ambiguous) { 3129 // Partial ordering did not produce a clear winner. Complain. 3130 Inst.Clear(); 3131 ClassTemplateSpec->setInvalidDecl(); 3132 S.Diag(PointOfInstantiation, 3133 diag::err_partial_spec_ordering_ambiguous) 3134 << ClassTemplateSpec; 3135 3136 // Print the matching partial specializations. 3137 for (SmallVectorImpl<MatchResult>::iterator P = Matched.begin(), 3138 PEnd = Matched.end(); 3139 P != PEnd; ++P) 3140 S.Diag(P->Partial->getLocation(), diag::note_partial_spec_match) 3141 << S.getTemplateArgumentBindingsText( 3142 P->Partial->getTemplateParameters(), *P->Args); 3143 3144 return nullptr; 3145 } 3146 } 3147 3148 ClassTemplateSpec->setInstantiationOf(Best->Partial, Best->Args); 3149 } else { 3150 // -- If no matches are found, the instantiation is generated 3151 // from the primary template. 3152 } 3153 } 3154 3155 CXXRecordDecl *Pattern = nullptr; 3156 Specialized = ClassTemplateSpec->getSpecializedTemplateOrPartial(); 3157 if (auto *PartialSpec = 3158 Specialized.dyn_cast<ClassTemplatePartialSpecializationDecl *>()) { 3159 // Instantiate using the best class template partial specialization. 3160 while (PartialSpec->getInstantiatedFromMember()) { 3161 // If we've found an explicit specialization of this class template, 3162 // stop here and use that as the pattern. 3163 if (PartialSpec->isMemberSpecialization()) 3164 break; 3165 3166 PartialSpec = PartialSpec->getInstantiatedFromMember(); 3167 } 3168 Pattern = PartialSpec; 3169 } else { 3170 ClassTemplateDecl *Template = ClassTemplateSpec->getSpecializedTemplate(); 3171 while (Template->getInstantiatedFromMemberTemplate()) { 3172 // If we've found an explicit specialization of this class template, 3173 // stop here and use that as the pattern. 3174 if (Template->isMemberSpecialization()) 3175 break; 3176 3177 Template = Template->getInstantiatedFromMemberTemplate(); 3178 } 3179 Pattern = Template->getTemplatedDecl(); 3180 } 3181 3182 return Pattern; 3183} 3184 3185bool Sema::InstantiateClassTemplateSpecialization( 3186 SourceLocation PointOfInstantiation, 3187 ClassTemplateSpecializationDecl *ClassTemplateSpec, 3188 TemplateSpecializationKind TSK, bool Complain) { 3189 // Perform the actual instantiation on the canonical declaration. 3190 ClassTemplateSpec = cast<ClassTemplateSpecializationDecl>( 3191 ClassTemplateSpec->getCanonicalDecl()); 3192 if (ClassTemplateSpec->isInvalidDecl()) 3193 return true; 3194 3195 CXXRecordDecl *Pattern = getPatternForClassTemplateSpecialization( 3196 *this, PointOfInstantiation, ClassTemplateSpec, TSK, Complain); 3197 if (!Pattern) 3198 return true; 3199 3200 return InstantiateClass(PointOfInstantiation, ClassTemplateSpec, Pattern, 3201 getTemplateInstantiationArgs(ClassTemplateSpec), TSK, 3202 Complain); 3203} 3204 3205/// Instantiates the definitions of all of the member 3206/// of the given class, which is an instantiation of a class template 3207/// or a member class of a template. 3208void 3209Sema::InstantiateClassMembers(SourceLocation PointOfInstantiation, 3210 CXXRecordDecl *Instantiation, 3211 const MultiLevelTemplateArgumentList &TemplateArgs, 3212 TemplateSpecializationKind TSK) { 3213 // FIXME: We need to notify the ASTMutationListener that we did all of these 3214 // things, in case we have an explicit instantiation definition in a PCM, a 3215 // module, or preamble, and the declaration is in an imported AST. 3216 assert((((TSK == TSK_ExplicitInstantiationDefinition || TSK == TSK_ExplicitInstantiationDeclaration
|| (TSK == TSK_ImplicitInstantiation && Instantiation
->isLocalClass())) && "Unexpected template specialization kind!"
) ? static_cast<void> (0) : __assert_fail ("(TSK == TSK_ExplicitInstantiationDefinition || TSK == TSK_ExplicitInstantiationDeclaration || (TSK == TSK_ImplicitInstantiation && Instantiation->isLocalClass())) && \"Unexpected template specialization kind!\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3220, __PRETTY_FUNCTION__))

Assuming 'TSK' is not equal to TSK_ExplicitInstantiationDefinition

→

←

Assuming 'TSK' is not equal to TSK_ExplicitInstantiationDeclaration

→

←

Assuming 'TSK' is equal to TSK_ImplicitInstantiation

→

←

'?' condition is true

→

3217 (TSK == TSK_ExplicitInstantiationDefinition ||(((TSK == TSK_ExplicitInstantiationDefinition || TSK == TSK_ExplicitInstantiationDeclaration
|| (TSK == TSK_ImplicitInstantiation && Instantiation
->isLocalClass())) && "Unexpected template specialization kind!"
) ? static_cast<void> (0) : __assert_fail ("(TSK == TSK_ExplicitInstantiationDefinition || TSK == TSK_ExplicitInstantiationDeclaration || (TSK == TSK_ImplicitInstantiation && Instantiation->isLocalClass())) && \"Unexpected template specialization kind!\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3220, __PRETTY_FUNCTION__)) 3218 TSK == TSK_ExplicitInstantiationDeclaration ||(((TSK == TSK_ExplicitInstantiationDefinition || TSK == TSK_ExplicitInstantiationDeclaration
|| (TSK == TSK_ImplicitInstantiation && Instantiation
->isLocalClass())) && "Unexpected template specialization kind!"
) ? static_cast<void> (0) : __assert_fail ("(TSK == TSK_ExplicitInstantiationDefinition || TSK == TSK_ExplicitInstantiationDeclaration || (TSK == TSK_ImplicitInstantiation && Instantiation->isLocalClass())) && \"Unexpected template specialization kind!\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3220, __PRETTY_FUNCTION__)) 3219 (TSK == TSK_ImplicitInstantiation && Instantiation->isLocalClass())) &&(((TSK == TSK_ExplicitInstantiationDefinition || TSK == TSK_ExplicitInstantiationDeclaration
|| (TSK == TSK_ImplicitInstantiation && Instantiation
->isLocalClass())) && "Unexpected template specialization kind!"
) ? static_cast<void> (0) : __assert_fail ("(TSK == TSK_ExplicitInstantiationDefinition || TSK == TSK_ExplicitInstantiationDeclaration || (TSK == TSK_ImplicitInstantiation && Instantiation->isLocalClass())) && \"Unexpected template specialization kind!\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3220, __PRETTY_FUNCTION__)) 3220 "Unexpected template specialization kind!")(((TSK == TSK_ExplicitInstantiationDefinition || TSK == TSK_ExplicitInstantiationDeclaration
|| (TSK == TSK_ImplicitInstantiation && Instantiation
->isLocalClass())) && "Unexpected template specialization kind!"
) ? static_cast<void> (0) : __assert_fail ("(TSK == TSK_ExplicitInstantiationDefinition || TSK == TSK_ExplicitInstantiationDeclaration || (TSK == TSK_ImplicitInstantiation && Instantiation->isLocalClass())) && \"Unexpected template specialization kind!\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3220, __PRETTY_FUNCTION__)); 3221 for (auto *D : Instantiation->decls()) { 3222 bool SuppressNew = false; 3223 if (auto *Function

5.1	'Function' is null

5.1	'Function' is null

= dyn_cast<FunctionDecl>(D)) {

←

Assuming 'D' is not a 'FunctionDecl'

→

←

Taking false branch

→

3224 if (FunctionDecl *Pattern = 3225 Function->getInstantiatedFromMemberFunction()) { 3226 3227 if (Function->hasAttr<ExcludeFromExplicitInstantiationAttr>()) 3228 continue; 3229 3230 MemberSpecializationInfo *MSInfo = 3231 Function->getMemberSpecializationInfo(); 3232 assert(MSInfo && "No member specialization information?")((MSInfo && "No member specialization information?") ?
static_cast<void> (0) : __assert_fail ("MSInfo && \"No member specialization information?\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3232, __PRETTY_FUNCTION__)); 3233 if (MSInfo->getTemplateSpecializationKind() 3234 == TSK_ExplicitSpecialization) 3235 continue; 3236 3237 if (CheckSpecializationInstantiationRedecl(PointOfInstantiation, TSK, 3238 Function, 3239 MSInfo->getTemplateSpecializationKind(), 3240 MSInfo->getPointOfInstantiation(), 3241 SuppressNew) || 3242 SuppressNew) 3243 continue; 3244 3245 // C++11 [temp.explicit]p8: 3246 // An explicit instantiation definition that names a class template 3247 // specialization explicitly instantiates the class template 3248 // specialization and is only an explicit instantiation definition 3249 // of members whose definition is visible at the point of 3250 // instantiation. 3251 if (TSK == TSK_ExplicitInstantiationDefinition && !Pattern->isDefined()) 3252 continue; 3253 3254 Function->setTemplateSpecializationKind(TSK, PointOfInstantiation); 3255 3256 if (Function->isDefined()) { 3257 // Let the ASTConsumer know that this function has been explicitly 3258 // instantiated now, and its linkage might have changed. 3259 Consumer.HandleTopLevelDecl(DeclGroupRef(Function)); 3260 } else if (TSK == TSK_ExplicitInstantiationDefinition) { 3261 InstantiateFunctionDefinition(PointOfInstantiation, Function); 3262 } else if (TSK == TSK_ImplicitInstantiation) { 3263 PendingLocalImplicitInstantiations.push_back( 3264 std::make_pair(Function, PointOfInstantiation)); 3265 } 3266 } 3267 } else if (auto *Var

7.1	'Var' is null

7.1	'Var' is null

= dyn_cast<VarDecl>(D)) {

←

Assuming 'D' is not a 'VarDecl'

→

←

Taking false branch

→

3268 if (isa<VarTemplateSpecializationDecl>(Var)) 3269 continue; 3270 3271 if (Var->isStaticDataMember()) { 3272 if (Var->hasAttr<ExcludeFromExplicitInstantiationAttr>()) 3273 continue; 3274 3275 MemberSpecializationInfo *MSInfo = Var->getMemberSpecializationInfo(); 3276 assert(MSInfo && "No member specialization information?")((MSInfo && "No member specialization information?") ?
static_cast<void> (0) : __assert_fail ("MSInfo && \"No member specialization information?\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3276, __PRETTY_FUNCTION__)); 3277 if (MSInfo->getTemplateSpecializationKind() 3278 == TSK_ExplicitSpecialization) 3279 continue; 3280 3281 if (CheckSpecializationInstantiationRedecl(PointOfInstantiation, TSK, 3282 Var, 3283 MSInfo->getTemplateSpecializationKind(), 3284 MSInfo->getPointOfInstantiation(), 3285 SuppressNew) || 3286 SuppressNew) 3287 continue; 3288 3289 if (TSK == TSK_ExplicitInstantiationDefinition) { 3290 // C++0x [temp.explicit]p8: 3291 // An explicit instantiation definition that names a class template 3292 // specialization explicitly instantiates the class template 3293 // specialization and is only an explicit instantiation definition 3294 // of members whose definition is visible at the point of 3295 // instantiation. 3296 if (!Var->getInstantiatedFromStaticDataMember()->getDefinition()) 3297 continue; 3298 3299 Var->setTemplateSpecializationKind(TSK, PointOfInstantiation); 3300 InstantiateVariableDefinition(PointOfInstantiation, Var); 3301 } else { 3302 Var->setTemplateSpecializationKind(TSK, PointOfInstantiation); 3303 } 3304 } 3305 } else if (auto *Record

9.1	'Record' is non-null

9.1	'Record' is non-null

= dyn_cast<CXXRecordDecl>(D)) {

←

Assuming 'D' is a 'CXXRecordDecl'

→

←

Taking true branch

→

3306 if (Record->hasAttr<ExcludeFromExplicitInstantiationAttr>())

←

Taking false branch

→

3307 continue; 3308 3309 // Always skip the injected-class-name, along with any 3310 // redeclarations of nested classes, since both would cause us 3311 // to try to instantiate the members of a class twice. 3312 // Skip closure types; they'll get instantiated when we instantiate 3313 // the corresponding lambda-expression. 3314 if (Record->isInjectedClassName() || Record->getPreviousDecl() ||

←

Assuming the condition is false

→

←

Taking false branch

→

3315 Record->isLambda()) 3316 continue; 3317 3318 MemberSpecializationInfo *MSInfo = Record->getMemberSpecializationInfo(); 3319 assert(MSInfo && "No member specialization information?")((MSInfo && "No member specialization information?") ?
static_cast<void> (0) : __assert_fail ("MSInfo && \"No member specialization information?\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3319, __PRETTY_FUNCTION__));

←

Assuming 'MSInfo' is non-null

→

←

'?' condition is true

→

3320 3321 if (MSInfo->getTemplateSpecializationKind()

←

Assuming the condition is false

→

←

Taking false branch

→

3322 == TSK_ExplicitSpecialization) 3323 continue; 3324 3325 if (Context.getTargetInfo().getTriple().isOSWindows() && 3326 TSK == TSK_ExplicitInstantiationDeclaration) { 3327 // On Windows, explicit instantiation decl of the outer class doesn't 3328 // affect the inner class. Typically extern template declarations are 3329 // used in combination with dll import/export annotations, but those 3330 // are not propagated from the outer class templates to inner classes. 3331 // Therefore, do not instantiate inner classes on this platform, so 3332 // that users don't end up with undefined symbols during linking. 3333 continue; 3334 } 3335 3336 if (CheckSpecializationInstantiationRedecl(PointOfInstantiation, TSK,

←

Assuming the condition is false

→

←

Assuming the condition is false

→

←

Taking false branch

→

3337 Record, 3338 MSInfo->getTemplateSpecializationKind(), 3339 MSInfo->getPointOfInstantiation(), 3340 SuppressNew) || 3341 SuppressNew) 3342 continue; 3343 3344 CXXRecordDecl *Pattern = Record->getInstantiatedFromMemberClass(); 3345 assert(Pattern && "Missing instantiated-from-template information")((Pattern && "Missing instantiated-from-template information"
) ? static_cast<void> (0) : __assert_fail ("Pattern && \"Missing instantiated-from-template information\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3345, __PRETTY_FUNCTION__));

←

Assuming 'Pattern' is non-null

→

←

'?' condition is true

→

3346 3347 if (!Record->getDefinition()) {

←

Taking true branch

→

3348 if (!Pattern->getDefinition()) {

←

Assuming the condition is false

→

←

Taking false branch

→

3349 // C++0x [temp.explicit]p8: 3350 // An explicit instantiation definition that names a class template 3351 // specialization explicitly instantiates the class template 3352 // specialization and is only an explicit instantiation definition 3353 // of members whose definition is visible at the point of 3354 // instantiation. 3355 if (TSK == TSK_ExplicitInstantiationDeclaration) { 3356 MSInfo->setTemplateSpecializationKind(TSK); 3357 MSInfo->setPointOfInstantiation(PointOfInstantiation); 3358 } 3359 3360 continue; 3361 } 3362 3363 InstantiateClass(PointOfInstantiation, Record, Pattern,

←

Calling 'Sema::InstantiateClass'

→

3364 TemplateArgs, 3365 TSK); 3366 } else { 3367 if (TSK == TSK_ExplicitInstantiationDefinition && 3368 Record->getTemplateSpecializationKind() == 3369 TSK_ExplicitInstantiationDeclaration) { 3370 Record->setTemplateSpecializationKind(TSK); 3371 MarkVTableUsed(PointOfInstantiation, Record, true); 3372 } 3373 } 3374 3375 Pattern = cast_or_null<CXXRecordDecl>(Record->getDefinition()); 3376 if (Pattern) 3377 InstantiateClassMembers(PointOfInstantiation, Pattern, TemplateArgs, 3378 TSK); 3379 } else if (auto *Enum = dyn_cast<EnumDecl>(D)) { 3380 MemberSpecializationInfo *MSInfo = Enum->getMemberSpecializationInfo(); 3381 assert(MSInfo && "No member specialization information?")((MSInfo && "No member specialization information?") ?
static_cast<void> (0) : __assert_fail ("MSInfo && \"No member specialization information?\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3381, __PRETTY_FUNCTION__)); 3382 3383 if (MSInfo->getTemplateSpecializationKind() 3384 == TSK_ExplicitSpecialization) 3385 continue; 3386 3387 if (CheckSpecializationInstantiationRedecl( 3388 PointOfInstantiation, TSK, Enum, 3389 MSInfo->getTemplateSpecializationKind(), 3390 MSInfo->getPointOfInstantiation(), SuppressNew) || 3391 SuppressNew) 3392 continue; 3393 3394 if (Enum->getDefinition()) 3395 continue; 3396 3397 EnumDecl *Pattern = Enum->getTemplateInstantiationPattern(); 3398 assert(Pattern && "Missing instantiated-from-template information")((Pattern && "Missing instantiated-from-template information"
) ? static_cast<void> (0) : __assert_fail ("Pattern && \"Missing instantiated-from-template information\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3398, __PRETTY_FUNCTION__)); 3399 3400 if (TSK == TSK_ExplicitInstantiationDefinition) { 3401 if (!Pattern->getDefinition()) 3402 continue; 3403 3404 InstantiateEnum(PointOfInstantiation, Enum, Pattern, TemplateArgs, TSK); 3405 } else { 3406 MSInfo->setTemplateSpecializationKind(TSK); 3407 MSInfo->setPointOfInstantiation(PointOfInstantiation); 3408 } 3409 } else if (auto *Field = dyn_cast<FieldDecl>(D)) { 3410 // No need to instantiate in-class initializers during explicit 3411 // instantiation. 3412 if (Field->hasInClassInitializer() && TSK == TSK_ImplicitInstantiation) { 3413 CXXRecordDecl *ClassPattern = 3414 Instantiation->getTemplateInstantiationPattern(); 3415 DeclContext::lookup_result Lookup = 3416 ClassPattern->lookup(Field->getDeclName()); 3417 FieldDecl *Pattern = cast<FieldDecl>(Lookup.front()); 3418 InstantiateInClassInitializer(PointOfInstantiation, Field, Pattern, 3419 TemplateArgs); 3420 } 3421 } 3422 } 3423} 3424 3425/// Instantiate the definitions of all of the members of the 3426/// given class template specialization, which was named as part of an 3427/// explicit instantiation. 3428void 3429Sema::InstantiateClassTemplateSpecializationMembers( 3430 SourceLocation PointOfInstantiation, 3431 ClassTemplateSpecializationDecl *ClassTemplateSpec, 3432 TemplateSpecializationKind TSK) { 3433 // C++0x [temp.explicit]p7: 3434 // An explicit instantiation that names a class template 3435 // specialization is an explicit instantion of the same kind 3436 // (declaration or definition) of each of its members (not 3437 // including members inherited from base classes) that has not 3438 // been previously explicitly specialized in the translation unit 3439 // containing the explicit instantiation, except as described 3440 // below. 3441 InstantiateClassMembers(PointOfInstantiation, ClassTemplateSpec, 3442 getTemplateInstantiationArgs(ClassTemplateSpec), 3443 TSK); 3444} 3445 3446StmtResult 3447Sema::SubstStmt(Stmt *S, const MultiLevelTemplateArgumentList &TemplateArgs) { 3448 if (!S) 3449 return S; 3450 3451 TemplateInstantiator Instantiator(*this, TemplateArgs, 3452 SourceLocation(), 3453 DeclarationName()); 3454 return Instantiator.TransformStmt(S); 3455} 3456 3457bool Sema::SubstTemplateArguments( 3458 ArrayRef<TemplateArgumentLoc> Args, 3459 const MultiLevelTemplateArgumentList &TemplateArgs, 3460 TemplateArgumentListInfo &Out) { 3461 TemplateInstantiator Instantiator(*this, TemplateArgs, 3462 SourceLocation(), 3463 DeclarationName()); 3464 return Instantiator.TransformTemplateArguments(Args.begin(), Args.end(), 3465 Out); 3466} 3467 3468ExprResult 3469Sema::SubstExpr(Expr *E, const MultiLevelTemplateArgumentList &TemplateArgs) { 3470 if (!E) 3471 return E; 3472 3473 TemplateInstantiator Instantiator(*this, TemplateArgs, 3474 SourceLocation(), 3475 DeclarationName()); 3476 return Instantiator.TransformExpr(E); 3477} 3478 3479ExprResult Sema::SubstInitializer(Expr *Init, 3480 const MultiLevelTemplateArgumentList &TemplateArgs, 3481 bool CXXDirectInit) { 3482 TemplateInstantiator Instantiator(*this, TemplateArgs, 3483 SourceLocation(), 3484 DeclarationName()); 3485 return Instantiator.TransformInitializer(Init, CXXDirectInit); 3486} 3487 3488bool Sema::SubstExprs(ArrayRef<Expr *> Exprs, bool IsCall, 3489 const MultiLevelTemplateArgumentList &TemplateArgs, 3490 SmallVectorImpl<Expr *> &Outputs) { 3491 if (Exprs.empty()) 3492 return false; 3493 3494 TemplateInstantiator Instantiator(*this, TemplateArgs, 3495 SourceLocation(), 3496 DeclarationName()); 3497 return Instantiator.TransformExprs(Exprs.data(), Exprs.size(), 3498 IsCall, Outputs); 3499} 3500 3501NestedNameSpecifierLoc 3502Sema::SubstNestedNameSpecifierLoc(NestedNameSpecifierLoc NNS, 3503 const MultiLevelTemplateArgumentList &TemplateArgs) { 3504 if (!NNS) 3505 return NestedNameSpecifierLoc(); 3506 3507 TemplateInstantiator Instantiator(*this, TemplateArgs, NNS.getBeginLoc(), 3508 DeclarationName()); 3509 return Instantiator.TransformNestedNameSpecifierLoc(NNS); 3510} 3511 3512/// Do template substitution on declaration name info. 3513DeclarationNameInfo 3514Sema::SubstDeclarationNameInfo(const DeclarationNameInfo &NameInfo, 3515 const MultiLevelTemplateArgumentList &TemplateArgs) { 3516 TemplateInstantiator Instantiator(*this, TemplateArgs, NameInfo.getLoc(), 3517 NameInfo.getName()); 3518 return Instantiator.TransformDeclarationNameInfo(NameInfo); 3519} 3520 3521TemplateName 3522Sema::SubstTemplateName(NestedNameSpecifierLoc QualifierLoc, 3523 TemplateName Name, SourceLocation Loc, 3524 const MultiLevelTemplateArgumentList &TemplateArgs) { 3525 TemplateInstantiator Instantiator(*this, TemplateArgs, Loc, 3526 DeclarationName()); 3527 CXXScopeSpec SS; 3528 SS.Adopt(QualifierLoc); 3529 return Instantiator.TransformTemplateName(SS, Name, Loc); 3530} 3531 3532bool Sema::Subst(const TemplateArgumentLoc *Args, unsigned NumArgs, 3533 TemplateArgumentListInfo &Result, 3534 const MultiLevelTemplateArgumentList &TemplateArgs) { 3535 TemplateInstantiator Instantiator(*this, TemplateArgs, SourceLocation(), 3536 DeclarationName()); 3537 3538 return Instantiator.TransformTemplateArguments(Args, NumArgs, Result); 3539} 3540 3541static const Decl *getCanonicalParmVarDecl(const Decl *D) { 3542 // When storing ParmVarDecls in the local instantiation scope, we always 3543 // want to use the ParmVarDecl from the canonical function declaration, 3544 // since the map is then valid for any redeclaration or definition of that 3545 // function. 3546 if (const ParmVarDecl *PV = dyn_cast<ParmVarDecl>(D)) { 3547 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(PV->getDeclContext())) { 3548 unsigned i = PV->getFunctionScopeIndex(); 3549 // This parameter might be from a freestanding function type within the 3550 // function and isn't necessarily referring to one of FD's parameters. 3551 if (i < FD->getNumParams() && FD->getParamDecl(i) == PV) 3552 return FD->getCanonicalDecl()->getParamDecl(i); 3553 } 3554 } 3555 return D; 3556} 3557 3558 3559llvm::PointerUnion<Decl *, LocalInstantiationScope::DeclArgumentPack *> * 3560LocalInstantiationScope::findInstantiationOf(const Decl *D) { 3561 D = getCanonicalParmVarDecl(D); 3562 for (LocalInstantiationScope *Current = this; Current; 3563 Current = Current->Outer) { 3564 3565 // Check if we found something within this scope. 3566 const Decl *CheckD = D; 3567 do { 3568 LocalDeclsMap::iterator Found = Current->LocalDecls.find(CheckD); 3569 if (Found != Current->LocalDecls.end()) 3570 return &Found->second; 3571 3572 // If this is a tag declaration, it's possible that we need to look for 3573 // a previous declaration. 3574 if (const TagDecl *Tag = dyn_cast<TagDecl>(CheckD)) 3575 CheckD = Tag->getPreviousDecl(); 3576 else 3577 CheckD = nullptr; 3578 } while (CheckD); 3579 3580 // If we aren't combined with our outer scope, we're done. 3581 if (!Current->CombineWithOuterScope) 3582 break; 3583 } 3584 3585 // If we're performing a partial substitution during template argument 3586 // deduction, we may not have values for template parameters yet. 3587 if (isa<NonTypeTemplateParmDecl>(D) || isa<TemplateTypeParmDecl>(D) || 3588 isa<TemplateTemplateParmDecl>(D)) 3589 return nullptr; 3590 3591 // Local types referenced prior to definition may require instantiation. 3592 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(D)) 3593 if (RD->isLocalClass()) 3594 return nullptr; 3595 3596 // Enumeration types referenced prior to definition may appear as a result of 3597 // error recovery. 3598 if (isa<EnumDecl>(D)) 3599 return nullptr; 3600 3601 // Materialized typedefs/type alias for implicit deduction guides may require 3602 // instantiation. 3603 if (isa<TypedefNameDecl>(D) && 3604 isa<CXXDeductionGuideDecl>(D->getDeclContext())) 3605 return nullptr; 3606 3607 // If we didn't find the decl, then we either have a sema bug, or we have a 3608 // forward reference to a label declaration. Return null to indicate that 3609 // we have an uninstantiated label. 3610 assert(isa<LabelDecl>(D) && "declaration not instantiated in this scope")((isa<LabelDecl>(D) && "declaration not instantiated in this scope"
) ? static_cast<void> (0) : __assert_fail ("isa<LabelDecl>(D) && \"declaration not instantiated in this scope\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3610, __PRETTY_FUNCTION__)); 3611 return nullptr; 3612} 3613 3614void LocalInstantiationScope::InstantiatedLocal(const Decl *D, Decl *Inst) { 3615 D = getCanonicalParmVarDecl(D); 3616 llvm::PointerUnion<Decl *, DeclArgumentPack *> &Stored = LocalDecls[D]; 3617 if (Stored.isNull()) { 3618#ifndef NDEBUG 3619 // It should not be present in any surrounding scope either. 3620 LocalInstantiationScope *Current = this; 3621 while (Current->CombineWithOuterScope && Current->Outer) { 3622 Current = Current->Outer; 3623 assert(Current->LocalDecls.find(D) == Current->LocalDecls.end() &&((Current->LocalDecls.find(D) == Current->LocalDecls.end
() && "Instantiated local in inner and outer scopes")
? static_cast<void> (0) : __assert_fail ("Current->LocalDecls.find(D) == Current->LocalDecls.end() && \"Instantiated local in inner and outer scopes\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3624, __PRETTY_FUNCTION__)) 3624 "Instantiated local in inner and outer scopes")((Current->LocalDecls.find(D) == Current->LocalDecls.end
() && "Instantiated local in inner and outer scopes")
? static_cast<void> (0) : __assert_fail ("Current->LocalDecls.find(D) == Current->LocalDecls.end() && \"Instantiated local in inner and outer scopes\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3624, __PRETTY_FUNCTION__)); 3625 } 3626#endif 3627 Stored = Inst; 3628 } else if (DeclArgumentPack *Pack = Stored.dyn_cast<DeclArgumentPack *>()) { 3629 Pack->push_back(cast<VarDecl>(Inst)); 3630 } else { 3631 assert(Stored.get<Decl *>() == Inst && "Already instantiated this local")((Stored.get<Decl *>() == Inst && "Already instantiated this local"
) ? static_cast<void> (0) : __assert_fail ("Stored.get<Decl *>() == Inst && \"Already instantiated this local\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3631, __PRETTY_FUNCTION__)); 3632 } 3633} 3634 3635void LocalInstantiationScope::InstantiatedLocalPackArg(const Decl *D, 3636 VarDecl *Inst) { 3637 D = getCanonicalParmVarDecl(D); 3638 DeclArgumentPack *Pack = LocalDecls[D].get<DeclArgumentPack *>(); 3639 Pack->push_back(Inst); 3640} 3641 3642void LocalInstantiationScope::MakeInstantiatedLocalArgPack(const Decl *D) { 3643#ifndef NDEBUG 3644 // This should be the first time we've been told about this decl. 3645 for (LocalInstantiationScope *Current = this; 3646 Current && Current->CombineWithOuterScope; Current = Current->Outer) 3647 assert(Current->LocalDecls.find(D) == Current->LocalDecls.end() &&((Current->LocalDecls.find(D) == Current->LocalDecls.end
() && "Creating local pack after instantiation of local"
) ? static_cast<void> (0) : __assert_fail ("Current->LocalDecls.find(D) == Current->LocalDecls.end() && \"Creating local pack after instantiation of local\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3648, __PRETTY_FUNCTION__)) 3648 "Creating local pack after instantiation of local")((Current->LocalDecls.find(D) == Current->LocalDecls.end
() && "Creating local pack after instantiation of local"
) ? static_cast<void> (0) : __assert_fail ("Current->LocalDecls.find(D) == Current->LocalDecls.end() && \"Creating local pack after instantiation of local\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3648, __PRETTY_FUNCTION__)); 3649#endif 3650 3651 D = getCanonicalParmVarDecl(D); 3652 llvm::PointerUnion<Decl *, DeclArgumentPack *> &Stored = LocalDecls[D]; 3653 DeclArgumentPack *Pack = new DeclArgumentPack; 3654 Stored = Pack; 3655 ArgumentPacks.push_back(Pack); 3656} 3657 3658bool LocalInstantiationScope::isLocalPackExpansion(const Decl *D) { 3659 for (DeclArgumentPack *Pack : ArgumentPacks) 3660 if (std::find(Pack->begin(), Pack->end(), D) != Pack->end()) 3661 return true; 3662 return false; 3663} 3664 3665void LocalInstantiationScope::SetPartiallySubstitutedPack(NamedDecl *Pack, 3666 const TemplateArgument *ExplicitArgs, 3667 unsigned NumExplicitArgs) { 3668 assert((!PartiallySubstitutedPack || PartiallySubstitutedPack == Pack) &&(((!PartiallySubstitutedPack || PartiallySubstitutedPack == Pack
) && "Already have a partially-substituted pack") ? static_cast
<void> (0) : __assert_fail ("(!PartiallySubstitutedPack || PartiallySubstitutedPack == Pack) && \"Already have a partially-substituted pack\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3669, __PRETTY_FUNCTION__)) 3669 "Already have a partially-substituted pack")(((!PartiallySubstitutedPack || PartiallySubstitutedPack == Pack
) && "Already have a partially-substituted pack") ? static_cast
<void> (0) : __assert_fail ("(!PartiallySubstitutedPack || PartiallySubstitutedPack == Pack) && \"Already have a partially-substituted pack\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3669, __PRETTY_FUNCTION__)); 3670 assert((!PartiallySubstitutedPack(((!PartiallySubstitutedPack || NumArgsInPartiallySubstitutedPack
== NumExplicitArgs) && "Wrong number of arguments in partially-substituted pack"
) ? static_cast<void> (0) : __assert_fail ("(!PartiallySubstitutedPack || NumArgsInPartiallySubstitutedPack == NumExplicitArgs) && \"Wrong number of arguments in partially-substituted pack\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3672, __PRETTY_FUNCTION__)) 3671 || NumArgsInPartiallySubstitutedPack == NumExplicitArgs) &&(((!PartiallySubstitutedPack || NumArgsInPartiallySubstitutedPack
== NumExplicitArgs) && "Wrong number of arguments in partially-substituted pack"
) ? static_cast<void> (0) : __assert_fail ("(!PartiallySubstitutedPack || NumArgsInPartiallySubstitutedPack == NumExplicitArgs) && \"Wrong number of arguments in partially-substituted pack\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3672, __PRETTY_FUNCTION__)) 3672 "Wrong number of arguments in partially-substituted pack")(((!PartiallySubstitutedPack || NumArgsInPartiallySubstitutedPack
== NumExplicitArgs) && "Wrong number of arguments in partially-substituted pack"
) ? static_cast<void> (0) : __assert_fail ("(!PartiallySubstitutedPack || NumArgsInPartiallySubstitutedPack == NumExplicitArgs) && \"Wrong number of arguments in partially-substituted pack\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/Sema/SemaTemplateInstantiate.cpp"
, 3672, __PRETTY_FUNCTION__)); 3673 PartiallySubstitutedPack = Pack; 3674 ArgsInPartiallySubstitutedPack = ExplicitArgs; 3675 NumArgsInPartiallySubstitutedPack = NumExplicitArgs; 3676} 3677 3678NamedDecl *LocalInstantiationScope::getPartiallySubstitutedPack( 3679 const TemplateArgument **ExplicitArgs, 3680 unsigned *NumExplicitArgs) const { 3681 if (ExplicitArgs) 3682 *ExplicitArgs = nullptr; 3683 if (NumExplicitArgs) 3684 *NumExplicitArgs = 0; 3685 3686 for (const LocalInstantiationScope *Current = this; Current; 3687 Current = Current->Outer) { 3688 if (Current->PartiallySubstitutedPack) { 3689 if (ExplicitArgs) 3690 *ExplicitArgs = Current->ArgsInPartiallySubstitutedPack; 3691 if (NumExplicitArgs) 3692 *NumExplicitArgs = Current->NumArgsInPartiallySubstitutedPack; 3693 3694 return Current->PartiallySubstitutedPack; 3695 } 3696 3697 if (!Current->CombineWithOuterScope) 3698 break; 3699 } 3700 3701 return nullptr; 3702}

←

/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/include/clang/Sema/Sema.h

1	//===--- Sema.h - Semantic Analysis & AST Building --------------- C++ --===//
2	//
3	// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4	// See https://llvm.org/LICENSE.txt for license information.
5	// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6	//
7	//===----------------------------------------------------------------------===//
8	//
9	// This file defines the Sema class, which performs semantic analysis and
10	// builds ASTs.
11	//
12	//===----------------------------------------------------------------------===//
13
14	#ifndef LLVM_CLANG_SEMA_SEMA_H
15	#define LLVM_CLANG_SEMA_SEMA_H
16
17	#include "clang/AST/ASTConcept.h"
18	#include "clang/AST/ASTFwd.h"
19	#include "clang/AST/Attr.h"
20	#include "clang/AST/Availability.h"
21	#include "clang/AST/ComparisonCategories.h"
22	#include "clang/AST/DeclTemplate.h"
23	#include "clang/AST/DeclarationName.h"
24	#include "clang/AST/Expr.h"
25	#include "clang/AST/ExprCXX.h"
26	#include "clang/AST/ExprConcepts.h"
27	#include "clang/AST/ExprObjC.h"
28	#include "clang/AST/ExprOpenMP.h"
29	#include "clang/AST/ExternalASTSource.h"
30	#include "clang/AST/LocInfoType.h"
31	#include "clang/AST/MangleNumberingContext.h"
32	#include "clang/AST/NSAPI.h"
33	#include "clang/AST/PrettyPrinter.h"
34	#include "clang/AST/StmtCXX.h"
35	#include "clang/AST/TypeLoc.h"
36	#include "clang/AST/TypeOrdering.h"
37	#include "clang/Basic/BitmaskEnum.h"
38	#include "clang/Basic/ExpressionTraits.h"
39	#include "clang/Basic/Module.h"
40	#include "clang/Basic/OpenCLOptions.h"
41	#include "clang/Basic/OpenMPKinds.h"
42	#include "clang/Basic/PragmaKinds.h"
43	#include "clang/Basic/Specifiers.h"
44	#include "clang/Basic/TemplateKinds.h"
45	#include "clang/Basic/TypeTraits.h"
46	#include "clang/Sema/AnalysisBasedWarnings.h"
47	#include "clang/Sema/CleanupInfo.h"
48	#include "clang/Sema/DeclSpec.h"
49	#include "clang/Sema/ExternalSemaSource.h"
50	#include "clang/Sema/IdentifierResolver.h"
51	#include "clang/Sema/ObjCMethodList.h"
52	#include "clang/Sema/Ownership.h"
53	#include "clang/Sema/Scope.h"
54	#include "clang/Sema/SemaConcept.h"
55	#include "clang/Sema/TypoCorrection.h"
56	#include "clang/Sema/Weak.h"
57	#include "llvm/ADT/ArrayRef.h"
58	#include "llvm/ADT/Optional.h"
59	#include "llvm/ADT/SetVector.h"
60	#include "llvm/ADT/SmallBitVector.h"
61	#include "llvm/ADT/SmallSet.h"
62	#include "llvm/ADT/SmallPtrSet.h"
63	#include "llvm/ADT/SmallVector.h"
64	#include "llvm/ADT/TinyPtrVector.h"
65	#include "llvm/Frontend/OpenMP/OMPConstants.h"
66	#include <deque>
67	#include <memory>
68	#include <string>
69	#include <tuple>
70	#include <vector>
71
72	namespace llvm {
73	class APSInt;
74	template <typename ValueT> struct DenseMapInfo;
75	template <typename ValueT, typename ValueInfoT> class DenseSet;
76	class SmallBitVector;
77	struct InlineAsmIdentifierInfo;
78	}
79
80	namespace clang {
81	class ADLResult;
82	class ASTConsumer;
83	class ASTContext;
84	class ASTMutationListener;
85	class ASTReader;
86	class ASTWriter;
87	class ArrayType;
88	class ParsedAttr;
89	class BindingDecl;
90	class BlockDecl;
91	class CapturedDecl;
92	class CXXBasePath;
93	class CXXBasePaths;
94	class CXXBindTemporaryExpr;
95	typedef SmallVector<CXXBaseSpecifier*, 4> CXXCastPath;
96	class CXXConstructorDecl;
97	class CXXConversionDecl;
98	class CXXDeleteExpr;
99	class CXXDestructorDecl;
100	class CXXFieldCollector;
101	class CXXMemberCallExpr;
102	class CXXMethodDecl;
103	class CXXScopeSpec;
104	class CXXTemporary;
105	class CXXTryStmt;
106	class CallExpr;
107	class ClassTemplateDecl;
108	class ClassTemplatePartialSpecializationDecl;
109	class ClassTemplateSpecializationDecl;
110	class VarTemplatePartialSpecializationDecl;
111	class CodeCompleteConsumer;
112	class CodeCompletionAllocator;
113	class CodeCompletionTUInfo;
114	class CodeCompletionResult;
115	class CoroutineBodyStmt;
116	class Decl;
117	class DeclAccessPair;
118	class DeclContext;
119	class DeclRefExpr;
120	class DeclaratorDecl;
121	class DeducedTemplateArgument;
122	class DependentDiagnostic;
123	class DesignatedInitExpr;
124	class Designation;
125	class EnableIfAttr;
126	class EnumConstantDecl;
127	class Expr;
128	class ExtVectorType;
129	class FormatAttr;
130	class FriendDecl;
131	class FunctionDecl;
132	class FunctionProtoType;
133	class FunctionTemplateDecl;
134	class ImplicitConversionSequence;
135	typedef MutableArrayRef<ImplicitConversionSequence> ConversionSequenceList;
136	class InitListExpr;
137	class InitializationKind;
138	class InitializationSequence;
139	class InitializedEntity;
140	class IntegerLiteral;
141	class LabelStmt;
142	class LambdaExpr;
143	class LangOptions;
144	class LocalInstantiationScope;
145	class LookupResult;
146	class MacroInfo;
147	typedef ArrayRef<std::pair<IdentifierInfo *, SourceLocation>> ModuleIdPath;
148	class ModuleLoader;
149	class MultiLevelTemplateArgumentList;
150	class NamedDecl;
151	class ObjCCategoryDecl;
152	class ObjCCategoryImplDecl;
153	class ObjCCompatibleAliasDecl;
154	class ObjCContainerDecl;
155	class ObjCImplDecl;
156	class ObjCImplementationDecl;
157	class ObjCInterfaceDecl;
158	class ObjCIvarDecl;
159	template <class T> class ObjCList;
160	class ObjCMessageExpr;
161	class ObjCMethodDecl;
162	class ObjCPropertyDecl;
163	class ObjCProtocolDecl;
164	class OMPThreadPrivateDecl;
165	class OMPRequiresDecl;
166	class OMPDeclareReductionDecl;
167	class OMPDeclareSimdDecl;
168	class OMPClause;
169	struct OMPVarListLocTy;
170	struct OverloadCandidate;
171	enum class OverloadCandidateParamOrder : char;
172	enum OverloadCandidateRewriteKind : unsigned;
173	class OverloadCandidateSet;
174	class OverloadExpr;
175	class ParenListExpr;
176	class ParmVarDecl;
177	class Preprocessor;
178	class PseudoDestructorTypeStorage;
179	class PseudoObjectExpr;
180	class QualType;
181	class StandardConversionSequence;
182	class Stmt;
183	class StringLiteral;
184	class SwitchStmt;
185	class TemplateArgument;
186	class TemplateArgumentList;
187	class TemplateArgumentLoc;
188	class TemplateDecl;
189	class TemplateInstantiationCallback;
190	class TemplateParameterList;
191	class TemplatePartialOrderingContext;
192	class TemplateTemplateParmDecl;
193	class Token;
194	class TypeAliasDecl;
195	class TypedefDecl;
196	class TypedefNameDecl;
197	class TypeLoc;
198	class TypoCorrectionConsumer;
199	class UnqualifiedId;
200	class UnresolvedLookupExpr;
201	class UnresolvedMemberExpr;
202	class UnresolvedSetImpl;
203	class UnresolvedSetIterator;
204	class UsingDecl;
205	class UsingShadowDecl;
206	class ValueDecl;
207	class VarDecl;
208	class VarTemplateSpecializationDecl;
209	class VisibilityAttr;
210	class VisibleDeclConsumer;
211	class IndirectFieldDecl;
212	struct DeductionFailureInfo;
213	class TemplateSpecCandidateSet;
214
215	namespace sema {
216	class AccessedEntity;
217	class BlockScopeInfo;
218	class Capture;
219	class CapturedRegionScopeInfo;
220	class CapturingScopeInfo;
221	class CompoundScopeInfo;
222	class DelayedDiagnostic;
223	class DelayedDiagnosticPool;
224	class FunctionScopeInfo;
225	class LambdaScopeInfo;
226	class PossiblyUnreachableDiag;
227	class SemaPPCallbacks;
228	class TemplateDeductionInfo;
229	}
230
231	namespace threadSafety {
232	class BeforeSet;
233	void threadSafetyCleanup(BeforeSet* Cache);
234	}
235
236	// FIXME: No way to easily map from TemplateTypeParmTypes to
237	// TemplateTypeParmDecls, so we have this horrible PointerUnion.
238	typedef std::pair<llvm::PointerUnion<const TemplateTypeParmType, NamedDecl>,
239	SourceLocation> UnexpandedParameterPack;
240
241	/// Describes whether we've seen any nullability information for the given
242	/// file.
243	struct FileNullability {
244	/// The first pointer declarator (of any pointer kind) in the file that does
245	/// not have a corresponding nullability annotation.
246	SourceLocation PointerLoc;
247
248	/// The end location for the first pointer declarator in the file. Used for
249	/// placing fix-its.
250	SourceLocation PointerEndLoc;
251
252	/// Which kind of pointer declarator we saw.
253	uint8_t PointerKind;
254
255	/// Whether we saw any type nullability annotations in the given file.
256	bool SawTypeNullability = false;
257	};
258
259	/// A mapping from file IDs to a record of whether we've seen nullability
260	/// information in that file.
261	class FileNullabilityMap {
262	/// A mapping from file IDs to the nullability information for each file ID.
263	llvm::DenseMap<FileID, FileNullability> Map;
264
265	/// A single-element cache based on the file ID.
266	struct {
267	FileID File;
268	FileNullability Nullability;
269	} Cache;
270
271	public:
272	FileNullability &operator[](FileID file) {
273	// Check the single-element cache.
274	if (file == Cache.File)
275	return Cache.Nullability;
276
277	// It's not in the single-element cache; flush the cache if we have one.
278	if (!Cache.File.isInvalid()) {
279	Map[Cache.File] = Cache.Nullability;
280	}
281
282	// Pull this entry into the cache.
283	Cache.File = file;
284	Cache.Nullability = Map[file];
285	return Cache.Nullability;
286	}
287	};
288
289	/// Keeps track of expected type during expression parsing. The type is tied to
290	/// a particular token, all functions that update or consume the type take a
291	/// start location of the token they are looking at as a parameter. This allows
292	/// to avoid updating the type on hot paths in the parser.
293	class PreferredTypeBuilder {
294	public:
295	PreferredTypeBuilder() = default;
296	explicit PreferredTypeBuilder(QualType Type) : Type(Type) {}
297
298	void enterCondition(Sema &S, SourceLocation Tok);
299	void enterReturn(Sema &S, SourceLocation Tok);
300	void enterVariableInit(SourceLocation Tok, Decl *D);
301	/// Computing a type for the function argument may require running
302	/// overloading, so we postpone its computation until it is actually needed.
303	///
304	/// Clients should be very careful when using this funciton, as it stores a
305	/// function_ref, clients should make sure all calls to get() with the same
306	/// location happen while function_ref is alive.
307	void enterFunctionArgument(SourceLocation Tok,
308	llvm::function_ref<QualType()> ComputeType);
309
310	void enterParenExpr(SourceLocation Tok, SourceLocation LParLoc);
311	void enterUnary(Sema &S, SourceLocation Tok, tok::TokenKind OpKind,
312	SourceLocation OpLoc);
313	void enterBinary(Sema &S, SourceLocation Tok, Expr *LHS, tok::TokenKind Op);
314	void enterMemAccess(Sema &S, SourceLocation Tok, Expr *Base);
315	void enterSubscript(Sema &S, SourceLocation Tok, Expr *LHS);
316	/// Handles all type casts, including C-style cast, C++ casts, etc.
317	void enterTypeCast(SourceLocation Tok, QualType CastType);
318
319	QualType get(SourceLocation Tok) const {
320	if (Tok != ExpectedLoc)
321	return QualType();
322	if (!Type.isNull())
323	return Type;
324	if (ComputeType)
325	return ComputeType();
326	return QualType();
327	}
328
329	private:
330	/// Start position of a token for which we store expected type.
331	SourceLocation ExpectedLoc;
332	/// Expected type for a token starting at ExpectedLoc.
333	QualType Type;
334	/// A function to compute expected type at ExpectedLoc. It is only considered
335	/// if Type is null.
336	llvm::function_ref<QualType()> ComputeType;
337	};
338
339	/// Sema - This implements semantic analysis and AST building for C.
340	class Sema final {
341	Sema(const Sema &) = delete;
342	void operator=(const Sema &) = delete;
343
344	/// A key method to reduce duplicate debug info from Sema.
345	virtual void anchor();
346
347	///Source of additional semantic information.
348	ExternalSemaSource *ExternalSource;
349
350	///Whether Sema has generated a multiplexer and has to delete it.
351	bool isMultiplexExternalSource;
352
353	static bool mightHaveNonExternalLinkage(const DeclaratorDecl *FD);
354
355	bool isVisibleSlow(const NamedDecl *D);
356
357	/// Determine whether two declarations should be linked together, given that
358	/// the old declaration might not be visible and the new declaration might
359	/// not have external linkage.
360	bool shouldLinkPossiblyHiddenDecl(const NamedDecl *Old,
361	const NamedDecl *New) {
362	if (isVisible(Old))
363	return true;
364	// See comment in below overload for why it's safe to compute the linkage
365	// of the new declaration here.
366	if (New->isExternallyDeclarable()) {
367	assert(Old->isExternallyDeclarable() &&((Old->isExternallyDeclarable() && "should not have found a non-externally-declarable previous decl" ) ? static_cast<void> (0) : __assert_fail ("Old->isExternallyDeclarable() && \"should not have found a non-externally-declarable previous decl\"" , "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/include/clang/Sema/Sema.h" , 368, __PRETTY_FUNCTION__))
368	"should not have found a non-externally-declarable previous decl")((Old->isExternallyDeclarable() && "should not have found a non-externally-declarable previous decl" ) ? static_cast<void> (0) : __assert_fail ("Old->isExternallyDeclarable() && \"should not have found a non-externally-declarable previous decl\"" , "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/include/clang/Sema/Sema.h" , 368, __PRETTY_FUNCTION__));
369	return true;
370	}
371	return false;
372	}
373	bool shouldLinkPossiblyHiddenDecl(LookupResult &Old, const NamedDecl *New);
374
375	void setupImplicitSpecialMemberType(CXXMethodDecl *SpecialMem,
376	QualType ResultTy,
377	ArrayRef<QualType> Args);
378
379	public:
380	/// The maximum alignment, same as in llvm::Value. We duplicate them here
381	/// because that allows us not to duplicate the constants in clang code,
382	/// which we must to since we can't directly use the llvm constants.
383	/// The value is verified against llvm here: lib/CodeGen/CGDecl.cpp
384	///
385	/// This is the greatest alignment value supported by load, store, and alloca
386	/// instructions, and global values.
387	static const unsigned MaxAlignmentExponent = 29;
388	static const unsigned MaximumAlignment = 1u << MaxAlignmentExponent;
389
390	typedef OpaquePtr<DeclGroupRef> DeclGroupPtrTy;
391	typedef OpaquePtr<TemplateName> TemplateTy;
392	typedef OpaquePtr<QualType> TypeTy;
393
394	OpenCLOptions OpenCLFeatures;
395	FPOptions CurFPFeatures;
396
397	const LangOptions &LangOpts;
398	Preprocessor &PP;
399	ASTContext &Context;
400	ASTConsumer &Consumer;
401	DiagnosticsEngine &Diags;
402	SourceManager &SourceMgr;
403
404	/// Flag indicating whether or not to collect detailed statistics.
405	bool CollectStats;
406
407	/// Code-completion consumer.
408	CodeCompleteConsumer *CodeCompleter;
409
410	/// CurContext - This is the current declaration context of parsing.
411	DeclContext *CurContext;
412
413	/// Generally null except when we temporarily switch decl contexts,
414	/// like in \see ActOnObjCTemporaryExitContainerContext.
415	DeclContext *OriginalLexicalContext;
416
417	/// VAListTagName - The declaration name corresponding to __va_list_tag.
418	/// This is used as part of a hack to omit that class from ADL results.
419	DeclarationName VAListTagName;
420
421	bool MSStructPragmaOn; // True when \#pragma ms_struct on
422
423	/// Controls member pointer representation format under the MS ABI.
424	LangOptions::PragmaMSPointersToMembersKind
425	MSPointerToMemberRepresentationMethod;
426
427	/// Stack of active SEH __finally scopes. Can be empty.
428	SmallVector<Scope*, 2> CurrentSEHFinally;
429
430	/// Source location for newly created implicit MSInheritanceAttrs
431	SourceLocation ImplicitMSInheritanceAttrLoc;
432
433	/// Holds TypoExprs that are created from `createDelayedTypo`. This is used by
434	/// `TransformTypos` in order to keep track of any TypoExprs that are created
435	/// recursively during typo correction and wipe them away if the correction
436	/// fails.
437	llvm::SmallVector<TypoExpr *, 2> TypoExprs;
438
439	/// pragma clang section kind
440	enum PragmaClangSectionKind {
441	PCSK_Invalid = 0,
442	PCSK_BSS = 1,
443	PCSK_Data = 2,
444	PCSK_Rodata = 3,
445	PCSK_Text = 4,
446	PCSK_Relro = 5
447	};
448
449	enum PragmaClangSectionAction {
450	PCSA_Set = 0,
451	PCSA_Clear = 1
452	};
453
454	struct PragmaClangSection {
455	std::string SectionName;
456	bool Valid = false;
457	SourceLocation PragmaLocation;
458
459	void Act(SourceLocation PragmaLocation,
460	PragmaClangSectionAction Action,
461	StringLiteral* Name);
462	};
463
464	PragmaClangSection PragmaClangBSSSection;
465	PragmaClangSection PragmaClangDataSection;
466	PragmaClangSection PragmaClangRodataSection;
467	PragmaClangSection PragmaClangRelroSection;
468	PragmaClangSection PragmaClangTextSection;
469
470	enum PragmaMsStackAction {
471	PSK_Reset = 0x0, // #pragma ()
472	PSK_Set = 0x1, // #pragma (value)
473	PSK_Push = 0x2, // #pragma (push[, id])
474	PSK_Pop = 0x4, // #pragma (pop[, id])
475	PSK_Show = 0x8, // #pragma (show) -- only for "pack"!
476	PSK_Push_Set = PSK_Push \| PSK_Set, // #pragma (push[, id], value)
477	PSK_Pop_Set = PSK_Pop \| PSK_Set, // #pragma (pop[, id], value)
478	};
479
480	template<typename ValueType>
481	struct PragmaStack {
482	struct Slot {
483	llvm::StringRef StackSlotLabel;
484	ValueType Value;
485	SourceLocation PragmaLocation;
486	SourceLocation PragmaPushLocation;
487	Slot(llvm::StringRef StackSlotLabel, ValueType Value,
488	SourceLocation PragmaLocation, SourceLocation PragmaPushLocation)
489	: StackSlotLabel(StackSlotLabel), Value(Value),
490	PragmaLocation(PragmaLocation),
491	PragmaPushLocation(PragmaPushLocation) {}
492	};
493
494	void Act(SourceLocation PragmaLocation, PragmaMsStackAction Action,
495	llvm::StringRef StackSlotLabel, ValueType Value) {
496	if (Action == PSK_Reset) {
497	CurrentValue = DefaultValue;
498	CurrentPragmaLocation = PragmaLocation;
499	return;
500	}
501	if (Action & PSK_Push)
502	Stack.emplace_back(StackSlotLabel, CurrentValue, CurrentPragmaLocation,
503	PragmaLocation);
504	else if (Action & PSK_Pop) {
505	if (!StackSlotLabel.empty()) {
506	// If we've got a label, try to find it and jump there.
507	auto I = llvm::find_if(llvm::reverse(Stack), [&](const Slot &x) {
508	return x.StackSlotLabel == StackSlotLabel;
509	});
510	// If we found the label so pop from there.
511	if (I != Stack.rend()) {
512	CurrentValue = I->Value;
513	CurrentPragmaLocation = I->PragmaLocation;
514	Stack.erase(std::prev(I.base()), Stack.end());
515	}
516	} else if (!Stack.empty()) {
517	// We do not have a label, just pop the last entry.
518	CurrentValue = Stack.back().Value;
519	CurrentPragmaLocation = Stack.back().PragmaLocation;
520	Stack.pop_back();
521	}
522	}
523	if (Action & PSK_Set) {
524	CurrentValue = Value;
525	CurrentPragmaLocation = PragmaLocation;
526	}
527	}
528
529	// MSVC seems to add artificial slots to #pragma stacks on entering a C++
530	// method body to restore the stacks on exit, so it works like this:
531	//
532	// struct S {
533	// #pragma <name>(push, InternalPragmaSlot, <current_pragma_value>)
534	// void Method {}
535	// #pragma <name>(pop, InternalPragmaSlot)
536	// };
537	//
538	// It works even with #pragma vtordisp, although MSVC doesn't support
539	// #pragma vtordisp(push [, id], n)
540	// syntax.
541	//
542	// Push / pop a named sentinel slot.
543	void SentinelAction(PragmaMsStackAction Action, StringRef Label) {
544	assert((Action == PSK_Push \|\| Action == PSK_Pop) &&(((Action == PSK_Push \|\| Action == PSK_Pop) && "Can only push / pop #pragma stack sentinels!" ) ? static_cast<void> (0) : __assert_fail ("(Action == PSK_Push \|\| Action == PSK_Pop) && \"Can only push / pop #pragma stack sentinels!\"" , "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/include/clang/Sema/Sema.h" , 545, __PRETTY_FUNCTION__))
545	"Can only push / pop #pragma stack sentinels!")(((Action == PSK_Push \|\| Action == PSK_Pop) && "Can only push / pop #pragma stack sentinels!" ) ? static_cast<void> (0) : __assert_fail ("(Action == PSK_Push \|\| Action == PSK_Pop) && \"Can only push / pop #pragma stack sentinels!\"" , "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/include/clang/Sema/Sema.h" , 545, __PRETTY_FUNCTION__));
546	Act(CurrentPragmaLocation, Action, Label, CurrentValue);
547	}
548
549	// Constructors.
550	explicit PragmaStack(const ValueType &Default)
551	: DefaultValue(Default), CurrentValue(Default) {}
552
553	bool hasValue() const { return CurrentValue != DefaultValue; }
554
555	SmallVector<Slot, 2> Stack;
556	ValueType DefaultValue; // Value used for PSK_Reset action.
557	ValueType CurrentValue;
558	SourceLocation CurrentPragmaLocation;
559	};
560	// FIXME: We should serialize / deserialize these if they occur in a PCH (but
561	// we shouldn't do so if they're in a module).
562
563	/// Whether to insert vtordisps prior to virtual bases in the Microsoft
564	/// C++ ABI. Possible values are 0, 1, and 2, which mean:
565	///
566	/// 0: Suppress all vtordisps
567	/// 1: Insert vtordisps in the presence of vbase overrides and non-trivial
568	/// structors
569	/// 2: Always insert vtordisps to support RTTI on partially constructed
570	/// objects
571	PragmaStack<MSVtorDispMode> VtorDispStack;
572	// #pragma pack.
573	// Sentinel to represent when the stack is set to mac68k alignment.
574	static const unsigned kMac68kAlignmentSentinel = ~0U;
575	PragmaStack<unsigned> PackStack;
576	// The current #pragma pack values and locations at each #include.
577	struct PackIncludeState {
578	unsigned CurrentValue;
579	SourceLocation CurrentPragmaLocation;
580	bool HasNonDefaultValue, ShouldWarnOnInclude;
581	};
582	SmallVector<PackIncludeState, 8> PackIncludeStack;
583	// Segment #pragmas.
584	PragmaStack<StringLiteral *> DataSegStack;
585	PragmaStack<StringLiteral *> BSSSegStack;
586	PragmaStack<StringLiteral *> ConstSegStack;
587	PragmaStack<StringLiteral *> CodeSegStack;
588
589	// This stack tracks the current state of Sema.CurFPFeatures.
590	PragmaStack<FPOptionsOverride> FpPragmaStack;
591	FPOptionsOverride CurFPFeatureOverrides() {
592	FPOptionsOverride result;
593	if (!FpPragmaStack.hasValue()) {
594	result = FPOptionsOverride();
595	} else {
596	result = FpPragmaStack.CurrentValue;
597	}
598	return result;
599	}
600
601	// RAII object to push / pop sentinel slots for all MS #pragma stacks.
602	// Actions should be performed only if we enter / exit a C++ method body.
603	class PragmaStackSentinelRAII {
604	public:
605	PragmaStackSentinelRAII(Sema &S, StringRef SlotLabel, bool ShouldAct);
606	~PragmaStackSentinelRAII();
607
608	private:
609	Sema &S;
610	StringRef SlotLabel;
611	bool ShouldAct;
612	};
613
614	/// A mapping that describes the nullability we've seen in each header file.
615	FileNullabilityMap NullabilityMap;
616
617	/// Last section used with #pragma init_seg.
618	StringLiteral *CurInitSeg;
619	SourceLocation CurInitSegLoc;
620
621	/// VisContext - Manages the stack for \#pragma GCC visibility.
622	void VisContext; // Really a "PragmaVisStack"
623
624	/// This an attribute introduced by \#pragma clang attribute.
625	struct PragmaAttributeEntry {
626	SourceLocation Loc;
627	ParsedAttr *Attribute;
628	SmallVector<attr::SubjectMatchRule, 4> MatchRules;
629	bool IsUsed;
630	};
631
632	/// A push'd group of PragmaAttributeEntries.
633	struct PragmaAttributeGroup {
634	/// The location of the push attribute.
635	SourceLocation Loc;
636	/// The namespace of this push group.
637	const IdentifierInfo *Namespace;
638	SmallVector<PragmaAttributeEntry, 2> Entries;
639	};
640
641	SmallVector<PragmaAttributeGroup, 2> PragmaAttributeStack;
642
643	/// The declaration that is currently receiving an attribute from the
644	/// #pragma attribute stack.
645	const Decl *PragmaAttributeCurrentTargetDecl;
646
647	/// This represents the last location of a "#pragma clang optimize off"
648	/// directive if such a directive has not been closed by an "on" yet. If
649	/// optimizations are currently "on", this is set to an invalid location.
650	SourceLocation OptimizeOffPragmaLocation;
651
652	/// Flag indicating if Sema is building a recovery call expression.
653	///
654	/// This flag is used to avoid building recovery call expressions
655	/// if Sema is already doing so, which would cause infinite recursions.
656	bool IsBuildingRecoveryCallExpr;
657
658	/// Used to control the generation of ExprWithCleanups.
659	CleanupInfo Cleanup;
660
661	/// ExprCleanupObjects - This is the stack of objects requiring
662	/// cleanup that are created by the current full expression.
663	SmallVector<ExprWithCleanups::CleanupObject, 8> ExprCleanupObjects;
664
665	/// Store a set of either DeclRefExprs or MemberExprs that contain a reference
666	/// to a variable (constant) that may or may not be odr-used in this Expr, and
667	/// we won't know until all lvalue-to-rvalue and discarded value conversions
668	/// have been applied to all subexpressions of the enclosing full expression.
669	/// This is cleared at the end of each full expression.
670	using MaybeODRUseExprSet = llvm::SetVector<Expr , SmallVector<Expr , 4>,
671	llvm::SmallPtrSet<Expr *, 4>>;
672	MaybeODRUseExprSet MaybeODRUseExprs;
673
674	std::unique_ptr<sema::FunctionScopeInfo> CachedFunctionScope;
675
676	/// Stack containing information about each of the nested
677	/// function, block, and method scopes that are currently active.
678	SmallVector<sema::FunctionScopeInfo *, 4> FunctionScopes;
679
680	/// The index of the first FunctionScope that corresponds to the current
681	/// context.
682	unsigned FunctionScopesStart = 0;
683
684	ArrayRef<sema::FunctionScopeInfo*> getFunctionScopes() const {
685	return llvm::makeArrayRef(FunctionScopes.begin() + FunctionScopesStart,
686	FunctionScopes.end());
687	}
688
689	/// Stack containing information needed when in C++2a an 'auto' is encountered
690	/// in a function declaration parameter type specifier in order to invent a
691	/// corresponding template parameter in the enclosing abbreviated function
692	/// template. This information is also present in LambdaScopeInfo, stored in
693	/// the FunctionScopes stack.
694	SmallVector<InventedTemplateParameterInfo, 4> InventedParameterInfos;
695
696	/// The index of the first InventedParameterInfo that refers to the current
697	/// context.
698	unsigned InventedParameterInfosStart = 0;
699
700	ArrayRef<InventedTemplateParameterInfo> getInventedParameterInfos() const {
701	return llvm::makeArrayRef(InventedParameterInfos.begin() +
702	InventedParameterInfosStart,
703	InventedParameterInfos.end());
704	}
705
706	typedef LazyVector<TypedefNameDecl *, ExternalSemaSource,
707	&ExternalSemaSource::ReadExtVectorDecls, 2, 2>
708	ExtVectorDeclsType;
709
710	/// ExtVectorDecls - This is a list all the extended vector types. This allows
711	/// us to associate a raw vector type with one of the ext_vector type names.
712	/// This is only necessary for issuing pretty diagnostics.
713	ExtVectorDeclsType ExtVectorDecls;
714
715	/// FieldCollector - Collects CXXFieldDecls during parsing of C++ classes.
716	std::unique_ptr<CXXFieldCollector> FieldCollector;
717
718	typedef llvm::SmallSetVector<NamedDecl *, 16> NamedDeclSetType;
719
720	/// Set containing all declared private fields that are not used.
721	NamedDeclSetType UnusedPrivateFields;
722
723	/// Set containing all typedefs that are likely unused.
724	llvm::SmallSetVector<const TypedefNameDecl *, 4>
725	UnusedLocalTypedefNameCandidates;
726
727	/// Delete-expressions to be analyzed at the end of translation unit
728	///
729	/// This list contains class members, and locations of delete-expressions
730	/// that could not be proven as to whether they mismatch with new-expression
731	/// used in initializer of the field.
732	typedef std::pair<SourceLocation, bool> DeleteExprLoc;
733	typedef llvm::SmallVector<DeleteExprLoc, 4> DeleteLocs;
734	llvm::MapVector<FieldDecl *, DeleteLocs> DeleteExprs;
735
736	typedef llvm::SmallPtrSet<const CXXRecordDecl*, 8> RecordDeclSetTy;
737
738	/// PureVirtualClassDiagSet - a set of class declarations which we have
739	/// emitted a list of pure virtual functions. Used to prevent emitting the
740	/// same list more than once.
741	std::unique_ptr<RecordDeclSetTy> PureVirtualClassDiagSet;
742
743	/// ParsingInitForAutoVars - a set of declarations with auto types for which
744	/// we are currently parsing the initializer.
745	llvm::SmallPtrSet<const Decl*, 4> ParsingInitForAutoVars;
746
747	/// Look for a locally scoped extern "C" declaration by the given name.
748	NamedDecl *findLocallyScopedExternCDecl(DeclarationName Name);
749
750	typedef LazyVector<VarDecl *, ExternalSemaSource,
751	&ExternalSemaSource::ReadTentativeDefinitions, 2, 2>
752	TentativeDefinitionsType;
753
754	/// All the tentative definitions encountered in the TU.
755	TentativeDefinitionsType TentativeDefinitions;
756
757	/// All the external declarations encoutered and used in the TU.
758	SmallVector<VarDecl *, 4> ExternalDeclarations;
759
760	typedef LazyVector<const DeclaratorDecl *, ExternalSemaSource,
761	&ExternalSemaSource::ReadUnusedFileScopedDecls, 2, 2>
762	UnusedFileScopedDeclsType;
763
764	/// The set of file scoped decls seen so far that have not been used
765	/// and must warn if not used. Only contains the first declaration.
766	UnusedFileScopedDeclsType UnusedFileScopedDecls;
767
768	typedef LazyVector<CXXConstructorDecl *, ExternalSemaSource,
769	&ExternalSemaSource::ReadDelegatingConstructors, 2, 2>
770	DelegatingCtorDeclsType;
771
772	/// All the delegating constructors seen so far in the file, used for
773	/// cycle detection at the end of the TU.
774	DelegatingCtorDeclsType DelegatingCtorDecls;
775
776	/// All the overriding functions seen during a class definition
777	/// that had their exception spec checks delayed, plus the overridden
778	/// function.
779	SmallVector<std::pair<const CXXMethodDecl, const CXXMethodDecl>, 2>
780	DelayedOverridingExceptionSpecChecks;
781
782	/// All the function redeclarations seen during a class definition that had
783	/// their exception spec checks delayed, plus the prior declaration they
784	/// should be checked against. Except during error recovery, the new decl
785	/// should always be a friend declaration, as that's the only valid way to
786	/// redeclare a special member before its class is complete.
787	SmallVector<std::pair<FunctionDecl, FunctionDecl>, 2>
788	DelayedEquivalentExceptionSpecChecks;
789
790	typedef llvm::MapVector<const FunctionDecl *,
791	std::unique_ptr<LateParsedTemplate>>
792	LateParsedTemplateMapT;
793	LateParsedTemplateMapT LateParsedTemplateMap;
794
795	/// Callback to the parser to parse templated functions when needed.
796	typedef void LateTemplateParserCB(void *P, LateParsedTemplate &LPT);
797	typedef void LateTemplateParserCleanupCB(void *P);
798	LateTemplateParserCB *LateTemplateParser;
799	LateTemplateParserCleanupCB *LateTemplateParserCleanup;
800	void *OpaqueParser;
801
802	void SetLateTemplateParser(LateTemplateParserCB *LTP,
803	LateTemplateParserCleanupCB *LTPCleanup,
804	void *P) {
805	LateTemplateParser = LTP;
806	LateTemplateParserCleanup = LTPCleanup;
807	OpaqueParser = P;
808	}
809
810	class DelayedDiagnostics;
811
812	class DelayedDiagnosticsState {
813	sema::DelayedDiagnosticPool *SavedPool;
814	friend class Sema::DelayedDiagnostics;
815	};
816	typedef DelayedDiagnosticsState ParsingDeclState;
817	typedef DelayedDiagnosticsState ProcessingContextState;
818
819	/// A class which encapsulates the logic for delaying diagnostics
820	/// during parsing and other processing.
821	class DelayedDiagnostics {
822	/// The current pool of diagnostics into which delayed
823	/// diagnostics should go.
824	sema::DelayedDiagnosticPool *CurPool;
825
826	public:
827	DelayedDiagnostics() : CurPool(nullptr) {}
828
829	/// Adds a delayed diagnostic.
830	void add(const sema::DelayedDiagnostic &diag); // in DelayedDiagnostic.h
831
832	/// Determines whether diagnostics should be delayed.
833	bool shouldDelayDiagnostics() { return CurPool != nullptr; }
834
835	/// Returns the current delayed-diagnostics pool.
836	sema::DelayedDiagnosticPool *getCurrentPool() const {
837	return CurPool;
838	}
839
840	/// Enter a new scope. Access and deprecation diagnostics will be
841	/// collected in this pool.
842	DelayedDiagnosticsState push(sema::DelayedDiagnosticPool &pool) {
843	DelayedDiagnosticsState state;
844	state.SavedPool = CurPool;
845	CurPool = &pool;
846	return state;
847	}
848
849	/// Leave a delayed-diagnostic state that was previously pushed.
850	/// Do not emit any of the diagnostics. This is performed as part
851	/// of the bookkeeping of popping a pool "properly".
852	void popWithoutEmitting(DelayedDiagnosticsState state) {
853	CurPool = state.SavedPool;
854	}
855
856	/// Enter a new scope where access and deprecation diagnostics are
857	/// not delayed.
858	DelayedDiagnosticsState pushUndelayed() {
859	DelayedDiagnosticsState state;
860	state.SavedPool = CurPool;
861	CurPool = nullptr;
862	return state;
863	}
864
865	/// Undo a previous pushUndelayed().
866	void popUndelayed(DelayedDiagnosticsState state) {
867	assert(CurPool == nullptr)((CurPool == nullptr) ? static_cast<void> (0) : __assert_fail ("CurPool == nullptr", "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/include/clang/Sema/Sema.h" , 867, __PRETTY_FUNCTION__));
868	CurPool = state.SavedPool;
869	}
870	} DelayedDiagnostics;
871
872	/// A RAII object to temporarily push a declaration context.
873	class ContextRAII {
874	private:
875	Sema &S;
876	DeclContext *SavedContext;
877	ProcessingContextState SavedContextState;
878	QualType SavedCXXThisTypeOverride;
879	unsigned SavedFunctionScopesStart;
880	unsigned SavedInventedParameterInfosStart;
881
882	public:
883	ContextRAII(Sema &S, DeclContext *ContextToPush, bool NewThisContext = true)
884	: S(S), SavedContext(S.CurContext),
885	SavedContextState(S.DelayedDiagnostics.pushUndelayed()),
886	SavedCXXThisTypeOverride(S.CXXThisTypeOverride),
887	SavedFunctionScopesStart(S.FunctionScopesStart),
888	SavedInventedParameterInfosStart(S.InventedParameterInfosStart)
889	{
890	assert(ContextToPush && "pushing null context")((ContextToPush && "pushing null context") ? static_cast <void> (0) : __assert_fail ("ContextToPush && \"pushing null context\"" , "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/include/clang/Sema/Sema.h" , 890, __PRETTY_FUNCTION__));
891	S.CurContext = ContextToPush;
892	if (NewThisContext)
893	S.CXXThisTypeOverride = QualType();
894	// Any saved FunctionScopes do not refer to this context.
895	S.FunctionScopesStart = S.FunctionScopes.size();
896	S.InventedParameterInfosStart = S.InventedParameterInfos.size();
897	}
898
899	void pop() {
900	if (!SavedContext) return;
901	S.CurContext = SavedContext;
902	S.DelayedDiagnostics.popUndelayed(SavedContextState);
903	S.CXXThisTypeOverride = SavedCXXThisTypeOverride;
904	S.FunctionScopesStart = SavedFunctionScopesStart;
905	S.InventedParameterInfosStart = SavedInventedParameterInfosStart;
906	SavedContext = nullptr;
907	}
908
909	~ContextRAII() {
910	pop();
911	}
912	};
913
914	/// Whether the AST is currently being rebuilt to correct immediate
915	/// invocations. Immediate invocation candidates and references to consteval
916	/// functions aren't tracked when this is set.
917	bool RebuildingImmediateInvocation = false;
918
919	/// Used to change context to isConstantEvaluated without pushing a heavy
920	/// ExpressionEvaluationContextRecord object.
921	bool isConstantEvaluatedOverride;
922
923	bool isConstantEvaluated() {
924	return ExprEvalContexts.back().isConstantEvaluated() \|\|
925	isConstantEvaluatedOverride;
926	}
927
928	/// RAII object to handle the state changes required to synthesize
929	/// a function body.
930	class SynthesizedFunctionScope {
931	Sema &S;
932	Sema::ContextRAII SavedContext;
933	bool PushedCodeSynthesisContext = false;
934
935	public:
936	SynthesizedFunctionScope(Sema &S, DeclContext *DC)
937	: S(S), SavedContext(S, DC) {
938	S.PushFunctionScope();
939	S.PushExpressionEvaluationContext(
940	Sema::ExpressionEvaluationContext::PotentiallyEvaluated);
941	if (auto *FD = dyn_cast<FunctionDecl>(DC))
942	FD->setWillHaveBody(true);
943	else
944	assert(isa<ObjCMethodDecl>(DC))((isa<ObjCMethodDecl>(DC)) ? static_cast<void> (0 ) : __assert_fail ("isa<ObjCMethodDecl>(DC)", "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/include/clang/Sema/Sema.h" , 944, __PRETTY_FUNCTION__));
945	}
946
947	void addContextNote(SourceLocation UseLoc) {
948	assert(!PushedCodeSynthesisContext)((!PushedCodeSynthesisContext) ? static_cast<void> (0) : __assert_fail ("!PushedCodeSynthesisContext", "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/include/clang/Sema/Sema.h" , 948, __PRETTY_FUNCTION__));
949
950	Sema::CodeSynthesisContext Ctx;
951	Ctx.Kind = Sema::CodeSynthesisContext::DefiningSynthesizedFunction;
952	Ctx.PointOfInstantiation = UseLoc;
953	Ctx.Entity = cast<Decl>(S.CurContext);
954	S.pushCodeSynthesisContext(Ctx);
955
956	PushedCodeSynthesisContext = true;
957	}
958
959	~SynthesizedFunctionScope() {
960	if (PushedCodeSynthesisContext)
961	S.popCodeSynthesisContext();
962	if (auto *FD = dyn_cast<FunctionDecl>(S.CurContext))
963	FD->setWillHaveBody(false);
964	S.PopExpressionEvaluationContext();
965	S.PopFunctionScopeInfo();
966	}
967	};
968
969	/// WeakUndeclaredIdentifiers - Identifiers contained in
970	/// \#pragma weak before declared. rare. may alias another
971	/// identifier, declared or undeclared
972	llvm::MapVector<IdentifierInfo *, WeakInfo> WeakUndeclaredIdentifiers;
973
974	/// ExtnameUndeclaredIdentifiers - Identifiers contained in
975	/// \#pragma redefine_extname before declared. Used in Solaris system headers
976	/// to define functions that occur in multiple standards to call the version
977	/// in the currently selected standard.
978	llvm::DenseMap<IdentifierInfo,AsmLabelAttr> ExtnameUndeclaredIdentifiers;
979
980
981	/// Load weak undeclared identifiers from the external source.
982	void LoadExternalWeakUndeclaredIdentifiers();
983
984	/// WeakTopLevelDecl - Translation-unit scoped declarations generated by
985	/// \#pragma weak during processing of other Decls.
986	/// I couldn't figure out a clean way to generate these in-line, so
987	/// we store them here and handle separately -- which is a hack.
988	/// It would be best to refactor this.
989	SmallVector<Decl*,2> WeakTopLevelDecl;
990
991	IdentifierResolver IdResolver;
992
993	/// Translation Unit Scope - useful to Objective-C actions that need
994	/// to lookup file scope declarations in the "ordinary" C decl namespace.
995	/// For example, user-defined classes, built-in "id" type, etc.
996	Scope *TUScope;
997
998	/// The C++ "std" namespace, where the standard library resides.
999	LazyDeclPtr StdNamespace;
1000
1001	/// The C++ "std::bad_alloc" class, which is defined by the C++
1002	/// standard library.
1003	LazyDeclPtr StdBadAlloc;
1004
1005	/// The C++ "std::align_val_t" enum class, which is defined by the C++
1006	/// standard library.
1007	LazyDeclPtr StdAlignValT;
1008
1009	/// The C++ "std::experimental" namespace, where the experimental parts
1010	/// of the standard library resides.
1011	NamespaceDecl *StdExperimentalNamespaceCache;
1012
1013	/// The C++ "std::initializer_list" template, which is defined in
1014	/// \<initializer_list>.
1015	ClassTemplateDecl *StdInitializerList;
1016
1017	/// The C++ "std::coroutine_traits" template, which is defined in
1018	/// \<coroutine_traits>
1019	ClassTemplateDecl *StdCoroutineTraitsCache;
1020
1021	/// The C++ "type_info" declaration, which is defined in \<typeinfo>.
1022	RecordDecl *CXXTypeInfoDecl;
1023
1024	/// The MSVC "_GUID" struct, which is defined in MSVC header files.
1025	RecordDecl *MSVCGuidDecl;
1026
1027	/// Caches identifiers/selectors for NSFoundation APIs.
1028	std::unique_ptr<NSAPI> NSAPIObj;
1029
1030	/// The declaration of the Objective-C NSNumber class.
1031	ObjCInterfaceDecl *NSNumberDecl;
1032
1033	/// The declaration of the Objective-C NSValue class.
1034	ObjCInterfaceDecl *NSValueDecl;
1035
1036	/// Pointer to NSNumber type (NSNumber *).
1037	QualType NSNumberPointer;
1038
1039	/// Pointer to NSValue type (NSValue *).
1040	QualType NSValuePointer;
1041
1042	/// The Objective-C NSNumber methods used to create NSNumber literals.
1043	ObjCMethodDecl *NSNumberLiteralMethods[NSAPI::NumNSNumberLiteralMethods];
1044
1045	/// The declaration of the Objective-C NSString class.
1046	ObjCInterfaceDecl *NSStringDecl;
1047
1048	/// Pointer to NSString type (NSString *).
1049	QualType NSStringPointer;
1050
1051	/// The declaration of the stringWithUTF8String: method.
1052	ObjCMethodDecl *StringWithUTF8StringMethod;
1053
1054	/// The declaration of the valueWithBytes:objCType: method.
1055	ObjCMethodDecl *ValueWithBytesObjCTypeMethod;
1056
1057	/// The declaration of the Objective-C NSArray class.
1058	ObjCInterfaceDecl *NSArrayDecl;
1059
1060	/// The declaration of the arrayWithObjects:count: method.
1061	ObjCMethodDecl *ArrayWithObjectsMethod;
1062
1063	/// The declaration of the Objective-C NSDictionary class.
1064	ObjCInterfaceDecl *NSDictionaryDecl;
1065
1066	/// The declaration of the dictionaryWithObjects:forKeys:count: method.
1067	ObjCMethodDecl *DictionaryWithObjectsMethod;
1068
1069	/// id<NSCopying> type.
1070	QualType QIDNSCopying;
1071
1072	/// will hold 'respondsToSelector:'
1073	Selector RespondsToSelectorSel;
1074
1075	/// A flag to remember whether the implicit forms of operator new and delete
1076	/// have been declared.
1077	bool GlobalNewDeleteDeclared;
1078
1079	/// A flag to indicate that we're in a context that permits abstract
1080	/// references to fields. This is really a
1081	bool AllowAbstractFieldReference;
1082
1083	/// Describes how the expressions currently being parsed are
1084	/// evaluated at run-time, if at all.
1085	enum class ExpressionEvaluationContext {
1086	/// The current expression and its subexpressions occur within an
1087	/// unevaluated operand (C++11 [expr]p7), such as the subexpression of
1088	/// \c sizeof, where the type of the expression may be significant but
1089	/// no code will be generated to evaluate the value of the expression at
1090	/// run time.
1091	Unevaluated,
1092
1093	/// The current expression occurs within a braced-init-list within
1094	/// an unevaluated operand. This is mostly like a regular unevaluated
1095	/// context, except that we still instantiate constexpr functions that are
1096	/// referenced here so that we can perform narrowing checks correctly.
1097	UnevaluatedList,
1098
1099	/// The current expression occurs within a discarded statement.
1100	/// This behaves largely similarly to an unevaluated operand in preventing
1101	/// definitions from being required, but not in other ways.
1102	DiscardedStatement,
1103
1104	/// The current expression occurs within an unevaluated
1105	/// operand that unconditionally permits abstract references to
1106	/// fields, such as a SIZE operator in MS-style inline assembly.
1107	UnevaluatedAbstract,
1108
1109	/// The current context is "potentially evaluated" in C++11 terms,
1110	/// but the expression is evaluated at compile-time (like the values of
1111	/// cases in a switch statement).
1112	ConstantEvaluated,
1113
1114	/// The current expression is potentially evaluated at run time,
1115	/// which means that code may be generated to evaluate the value of the
1116	/// expression at run time.
1117	PotentiallyEvaluated,
1118
1119	/// The current expression is potentially evaluated, but any
1120	/// declarations referenced inside that expression are only used if
1121	/// in fact the current expression is used.
1122	///
1123	/// This value is used when parsing default function arguments, for which
1124	/// we would like to provide diagnostics (e.g., passing non-POD arguments
1125	/// through varargs) but do not want to mark declarations as "referenced"
1126	/// until the default argument is used.
1127	PotentiallyEvaluatedIfUsed
1128	};
1129
1130	using ImmediateInvocationCandidate = llvm::PointerIntPair<ConstantExpr *, 1>;
1131
1132	/// Data structure used to record current or nested
1133	/// expression evaluation contexts.
1134	struct ExpressionEvaluationContextRecord {
1135	/// The expression evaluation context.
1136	ExpressionEvaluationContext Context;
1137
1138	/// Whether the enclosing context needed a cleanup.
1139	CleanupInfo ParentCleanup;
1140
1141	/// Whether we are in a decltype expression.
1142	bool IsDecltype;
1143
1144	/// The number of active cleanup objects when we entered
1145	/// this expression evaluation context.
1146	unsigned NumCleanupObjects;
1147
1148	/// The number of typos encountered during this expression evaluation
1149	/// context (i.e. the number of TypoExprs created).
1150	unsigned NumTypos;
1151
1152	MaybeODRUseExprSet SavedMaybeODRUseExprs;
1153
1154	/// The lambdas that are present within this context, if it
1155	/// is indeed an unevaluated context.
1156	SmallVector<LambdaExpr *, 2> Lambdas;
1157
1158	/// The declaration that provides context for lambda expressions
1159	/// and block literals if the normal declaration context does not
1160	/// suffice, e.g., in a default function argument.
1161	Decl *ManglingContextDecl;
1162
1163	/// If we are processing a decltype type, a set of call expressions
1164	/// for which we have deferred checking the completeness of the return type.
1165	SmallVector<CallExpr *, 8> DelayedDecltypeCalls;
1166
1167	/// If we are processing a decltype type, a set of temporary binding
1168	/// expressions for which we have deferred checking the destructor.
1169	SmallVector<CXXBindTemporaryExpr *, 8> DelayedDecltypeBinds;
1170
1171	llvm::SmallPtrSet<const Expr *, 8> PossibleDerefs;
1172
1173	/// Expressions appearing as the LHS of a volatile assignment in this
1174	/// context. We produce a warning for these when popping the context if
1175	/// they are not discarded-value expressions nor unevaluated operands.
1176	SmallVector<Expr*, 2> VolatileAssignmentLHSs;
1177
1178	/// Set of candidates for starting an immediate invocation.
1179	llvm::SmallVector<ImmediateInvocationCandidate, 4> ImmediateInvocationCandidates;
1180
1181	/// Set of DeclRefExprs referencing a consteval function when used in a
1182	/// context not already known to be immediately invoked.
1183	llvm::SmallPtrSet<DeclRefExpr *, 4> ReferenceToConsteval;
1184
1185	/// \brief Describes whether we are in an expression constext which we have
1186	/// to handle differently.
1187	enum ExpressionKind {
1188	EK_Decltype, EK_TemplateArgument, EK_Other
1189	} ExprContext;
1190
1191	ExpressionEvaluationContextRecord(ExpressionEvaluationContext Context,
1192	unsigned NumCleanupObjects,
1193	CleanupInfo ParentCleanup,
1194	Decl *ManglingContextDecl,
1195	ExpressionKind ExprContext)
1196	: Context(Context), ParentCleanup(ParentCleanup),
1197	NumCleanupObjects(NumCleanupObjects), NumTypos(0),
1198	ManglingContextDecl(ManglingContextDecl), ExprContext(ExprContext) {}
1199
1200	bool isUnevaluated() const {
1201	return Context == ExpressionEvaluationContext::Unevaluated \|\|
1202	Context == ExpressionEvaluationContext::UnevaluatedAbstract \|\|
1203	Context == ExpressionEvaluationContext::UnevaluatedList;
1204	}
1205	bool isConstantEvaluated() const {
1206	return Context == ExpressionEvaluationContext::ConstantEvaluated;
1207	}
1208	};
1209
1210	/// A stack of expression evaluation contexts.
1211	SmallVector<ExpressionEvaluationContextRecord, 8> ExprEvalContexts;
1212
1213	/// Emit a warning for all pending noderef expressions that we recorded.
1214	void WarnOnPendingNoDerefs(ExpressionEvaluationContextRecord &Rec);
1215
1216	/// Compute the mangling number context for a lambda expression or
1217	/// block literal. Also return the extra mangling decl if any.
1218	///
1219	/// \param DC - The DeclContext containing the lambda expression or
1220	/// block literal.
1221	std::tuple<MangleNumberingContext , Decl >
1222	getCurrentMangleNumberContext(const DeclContext *DC);
1223
1224
1225	/// SpecialMemberOverloadResult - The overloading result for a special member
1226	/// function.
1227	///
1228	/// This is basically a wrapper around PointerIntPair. The lowest bits of the
1229	/// integer are used to determine whether overload resolution succeeded.
1230	class SpecialMemberOverloadResult {
1231	public:
1232	enum Kind {
1233	NoMemberOrDeleted,
1234	Ambiguous,
1235	Success
1236	};
1237
1238	private:
1239	llvm::PointerIntPair<CXXMethodDecl*, 2> Pair;
1240
1241	public:
1242	SpecialMemberOverloadResult() : Pair() {}
1243	SpecialMemberOverloadResult(CXXMethodDecl *MD)
1244	: Pair(MD, MD->isDeleted() ? NoMemberOrDeleted : Success) {}
1245
1246	CXXMethodDecl *getMethod() const { return Pair.getPointer(); }
1247	void setMethod(CXXMethodDecl *MD) { Pair.setPointer(MD); }
1248
1249	Kind getKind() const { return static_cast<Kind>(Pair.getInt()); }
1250	void setKind(Kind K) { Pair.setInt(K); }
1251	};
1252
1253	class SpecialMemberOverloadResultEntry
1254	: public llvm::FastFoldingSetNode,
1255	public SpecialMemberOverloadResult {
1256	public:
1257	SpecialMemberOverloadResultEntry(const llvm::FoldingSetNodeID &ID)
1258	: FastFoldingSetNode(ID)
1259	{}
1260	};
1261
1262	/// A cache of special member function overload resolution results
1263	/// for C++ records.
1264	llvm::FoldingSet<SpecialMemberOverloadResultEntry> SpecialMemberCache;
1265
1266	/// A cache of the flags available in enumerations with the flag_bits
1267	/// attribute.
1268	mutable llvm::DenseMap<const EnumDecl*, llvm::APInt> FlagBitsCache;
1269
1270	/// The kind of translation unit we are processing.
1271	///
1272	/// When we're processing a complete translation unit, Sema will perform
1273	/// end-of-translation-unit semantic tasks (such as creating
1274	/// initializers for tentative definitions in C) once parsing has
1275	/// completed. Modules and precompiled headers perform different kinds of
1276	/// checks.
1277	TranslationUnitKind TUKind;
1278
1279	llvm::BumpPtrAllocator BumpAlloc;
1280
1281	/// The number of SFINAE diagnostics that have been trapped.
1282	unsigned NumSFINAEErrors;
1283
1284	typedef llvm::DenseMap<ParmVarDecl , llvm::TinyPtrVector<ParmVarDecl >>
1285	UnparsedDefaultArgInstantiationsMap;
1286
1287	/// A mapping from parameters with unparsed default arguments to the
1288	/// set of instantiations of each parameter.
1289	///
1290	/// This mapping is a temporary data structure used when parsing
1291	/// nested class templates or nested classes of class templates,
1292	/// where we might end up instantiating an inner class before the
1293	/// default arguments of its methods have been parsed.
1294	UnparsedDefaultArgInstantiationsMap UnparsedDefaultArgInstantiations;
1295
1296	// Contains the locations of the beginning of unparsed default
1297	// argument locations.
1298	llvm::DenseMap<ParmVarDecl *, SourceLocation> UnparsedDefaultArgLocs;
1299
1300	/// UndefinedInternals - all the used, undefined objects which require a
1301	/// definition in this translation unit.
1302	llvm::MapVector<NamedDecl *, SourceLocation> UndefinedButUsed;
1303
1304	/// Determine if VD, which must be a variable or function, is an external
1305	/// symbol that nonetheless can't be referenced from outside this translation
1306	/// unit because its type has no linkage and it's not extern "C".
1307	bool isExternalWithNoLinkageType(ValueDecl *VD);
1308
1309	/// Obtain a sorted list of functions that are undefined but ODR-used.
1310	void getUndefinedButUsed(
1311	SmallVectorImpl<std::pair<NamedDecl *, SourceLocation> > &Undefined);
1312
1313	/// Retrieves list of suspicious delete-expressions that will be checked at
1314	/// the end of translation unit.
1315	const llvm::MapVector<FieldDecl *, DeleteLocs> &
1316	getMismatchingDeleteExpressions() const;
1317
1318	typedef std::pair<ObjCMethodList, ObjCMethodList> GlobalMethods;
1319	typedef llvm::DenseMap<Selector, GlobalMethods> GlobalMethodPool;
1320
1321	/// Method Pool - allows efficient lookup when typechecking messages to "id".
1322	/// We need to maintain a list, since selectors can have differing signatures
1323	/// across classes. In Cocoa, this happens to be extremely uncommon (only 1%
1324	/// of selectors are "overloaded").
1325	/// At the head of the list it is recorded whether there were 0, 1, or >= 2
1326	/// methods inside categories with a particular selector.
1327	GlobalMethodPool MethodPool;
1328
1329	/// Method selectors used in a \@selector expression. Used for implementation
1330	/// of -Wselector.
1331	llvm::MapVector<Selector, SourceLocation> ReferencedSelectors;
1332
1333	/// List of SourceLocations where 'self' is implicitly retained inside a
1334	/// block.
1335	llvm::SmallVector<std::pair<SourceLocation, const BlockDecl *>, 1>
1336	ImplicitlyRetainedSelfLocs;
1337
1338	/// Kinds of C++ special members.
1339	enum CXXSpecialMember {
1340	CXXDefaultConstructor,
1341	CXXCopyConstructor,
1342	CXXMoveConstructor,
1343	CXXCopyAssignment,
1344	CXXMoveAssignment,
1345	CXXDestructor,
1346	CXXInvalid
1347	};
1348
1349	typedef llvm::PointerIntPair<CXXRecordDecl *, 3, CXXSpecialMember>
1350	SpecialMemberDecl;
1351
1352	/// The C++ special members which we are currently in the process of
1353	/// declaring. If this process recursively triggers the declaration of the
1354	/// same special member, we should act as if it is not yet declared.
1355	llvm::SmallPtrSet<SpecialMemberDecl, 4> SpecialMembersBeingDeclared;
1356
1357	/// Kinds of defaulted comparison operator functions.
1358	enum class DefaultedComparisonKind : unsigned char {
1359	/// This is not a defaultable comparison operator.
1360	None,
1361	/// This is an operator== that should be implemented as a series of
1362	/// subobject comparisons.
1363	Equal,
1364	/// This is an operator<=> that should be implemented as a series of
1365	/// subobject comparisons.
1366	ThreeWay,
1367	/// This is an operator!= that should be implemented as a rewrite in terms
1368	/// of a == comparison.
1369	NotEqual,
1370	/// This is an <, <=, >, or >= that should be implemented as a rewrite in
1371	/// terms of a <=> comparison.
1372	Relational,
1373	};
1374
1375	/// The function definitions which were renamed as part of typo-correction
1376	/// to match their respective declarations. We want to keep track of them
1377	/// to ensure that we don't emit a "redefinition" error if we encounter a
1378	/// correctly named definition after the renamed definition.
1379	llvm::SmallPtrSet<const NamedDecl *, 4> TypoCorrectedFunctionDefinitions;
1380
1381	/// Stack of types that correspond to the parameter entities that are
1382	/// currently being copy-initialized. Can be empty.
1383	llvm::SmallVector<QualType, 4> CurrentParameterCopyTypes;
1384
1385	void ReadMethodPool(Selector Sel);
1386	void updateOutOfDateSelector(Selector Sel);
1387
1388	/// Private Helper predicate to check for 'self'.
1389	bool isSelfExpr(Expr *RExpr);
1390	bool isSelfExpr(Expr RExpr, const ObjCMethodDecl Method);
1391
1392	/// Cause the active diagnostic on the DiagosticsEngine to be
1393	/// emitted. This is closely coupled to the SemaDiagnosticBuilder class and
1394	/// should not be used elsewhere.
1395	void EmitCurrentDiagnostic(unsigned DiagID);
1396
1397	/// Records and restores the CurFPFeatures state on entry/exit of compound
1398	/// statements.
1399	class FPFeaturesStateRAII {
1400	public:
1401	FPFeaturesStateRAII(Sema &S) : S(S), OldFPFeaturesState(S.CurFPFeatures) {
1402	OldOverrides = S.FpPragmaStack.CurrentValue;
1403	}
1404	~FPFeaturesStateRAII() {
1405	S.CurFPFeatures = OldFPFeaturesState;
1406	S.FpPragmaStack.CurrentValue = OldOverrides;
1407	}
1408	FPOptionsOverride getOverrides() { return OldOverrides; }
1409
1410	private:
1411	Sema& S;
1412	FPOptions OldFPFeaturesState;
1413	FPOptionsOverride OldOverrides;
1414	};
1415
1416	void addImplicitTypedef(StringRef Name, QualType T);
1417
1418	bool WarnedStackExhausted = false;
1419
1420	public:
1421	Sema(Preprocessor &pp, ASTContext &ctxt, ASTConsumer &consumer,
1422	TranslationUnitKind TUKind = TU_Complete,
1423	CodeCompleteConsumer *CompletionConsumer = nullptr);
1424	~Sema();
1425
1426	/// Perform initialization that occurs after the parser has been
1427	/// initialized but before it parses anything.
1428	void Initialize();
1429
1430	const LangOptions &getLangOpts() const { return LangOpts; }
1431	OpenCLOptions &getOpenCLOptions() { return OpenCLFeatures; }
1432	FPOptions &getCurFPFeatures() { return CurFPFeatures; }
1433
1434	DiagnosticsEngine &getDiagnostics() const { return Diags; }
1435	SourceManager &getSourceManager() const { return SourceMgr; }
1436	Preprocessor &getPreprocessor() const { return PP; }
1437	ASTContext &getASTContext() const { return Context; }
1438	ASTConsumer &getASTConsumer() const { return Consumer; }
1439	ASTMutationListener *getASTMutationListener() const;
1440	ExternalSemaSource* getExternalSource() const { return ExternalSource; }
1441
1442	///Registers an external source. If an external source already exists,
1443	/// creates a multiplex external source and appends to it.
1444	///
1445	///\param[in] E - A non-null external sema source.
1446	///
1447	void addExternalSource(ExternalSemaSource *E);
1448
1449	void PrintStats() const;
1450
1451	/// Warn that the stack is nearly exhausted.
1452	void warnStackExhausted(SourceLocation Loc);
1453
1454	/// Run some code with "sufficient" stack space. (Currently, at least 256K is
1455	/// guaranteed). Produces a warning if we're low on stack space and allocates
1456	/// more in that case. Use this in code that may recurse deeply (for example,
1457	/// in template instantiation) to avoid stack overflow.
1458	void runWithSufficientStackSpace(SourceLocation Loc,
1459	llvm::function_ref<void()> Fn);
1460
1461	/// Helper class that creates diagnostics with optional
1462	/// template instantiation stacks.
1463	///
1464	/// This class provides a wrapper around the basic DiagnosticBuilder
1465	/// class that emits diagnostics. ImmediateDiagBuilder is
1466	/// responsible for emitting the diagnostic (as DiagnosticBuilder
1467	/// does) and, if the diagnostic comes from inside a template
1468	/// instantiation, printing the template instantiation stack as
1469	/// well.
1470	class ImmediateDiagBuilder : public DiagnosticBuilder {
1471	Sema &SemaRef;
1472	unsigned DiagID;
1473
1474	public:
1475	ImmediateDiagBuilder(DiagnosticBuilder &DB, Sema &SemaRef, unsigned DiagID)
1476	: DiagnosticBuilder(DB), SemaRef(SemaRef), DiagID(DiagID) {}
1477	ImmediateDiagBuilder(DiagnosticBuilder &&DB, Sema &SemaRef, unsigned DiagID)
1478	: DiagnosticBuilder(DB), SemaRef(SemaRef), DiagID(DiagID) {}
1479
1480	// This is a cunning lie. DiagnosticBuilder actually performs move
1481	// construction in its copy constructor (but due to varied uses, it's not
1482	// possible to conveniently express this as actual move construction). So
1483	// the default copy ctor here is fine, because the base class disables the
1484	// source anyway, so the user-defined ~ImmediateDiagBuilder is a safe no-op
1485	// in that case anwyay.
1486	ImmediateDiagBuilder(const ImmediateDiagBuilder &) = default;
1487
1488	~ImmediateDiagBuilder() {
1489	// If we aren't active, there is nothing to do.
1490	if (!isActive()) return;
1491
1492	// Otherwise, we need to emit the diagnostic. First clear the diagnostic
1493	// builder itself so it won't emit the diagnostic in its own destructor.
1494	//
1495	// This seems wasteful, in that as written the DiagnosticBuilder dtor will
1496	// do its own needless checks to see if the diagnostic needs to be
1497	// emitted. However, because we take care to ensure that the builder
1498	// objects never escape, a sufficiently smart compiler will be able to
1499	// eliminate that code.
1500	Clear();
1501
1502	// Dispatch to Sema to emit the diagnostic.
1503	SemaRef.EmitCurrentDiagnostic(DiagID);
1504	}
1505
1506	/// Teach operator<< to produce an object of the correct type.
1507	template <typename T>
1508	friend const ImmediateDiagBuilder &
1509	operator<<(const ImmediateDiagBuilder &Diag, const T &Value) {
1510	const DiagnosticBuilder &BaseDiag = Diag;
1511	BaseDiag << Value;
1512	return Diag;
1513	}
1514
1515	// It is necessary to limit this to rvalue reference to avoid calling this
1516	// function with a bitfield lvalue argument since non-const reference to
1517	// bitfield is not allowed.
1518	template <typename T, typename = typename std::enable_if<
1519	!std::is_lvalue_reference<T>::value>::type>
1520	const ImmediateDiagBuilder &operator<<(T &&V) const {
1521	const DiagnosticBuilder &BaseDiag = *this;
1522	BaseDiag << std::move(V);
1523	return *this;
1524	}
1525	};
1526
1527	/// A generic diagnostic builder for errors which may or may not be deferred.
1528	///
1529	/// In CUDA, there exist constructs (e.g. variable-length arrays, try/catch)
1530	/// which are not allowed to appear inside __device__ functions and are
1531	/// allowed to appear in __host__ __device__ functions only if the host+device
1532	/// function is never codegen'ed.
1533	///
1534	/// To handle this, we use the notion of "deferred diagnostics", where we
1535	/// attach a diagnostic to a FunctionDecl that's emitted iff it's codegen'ed.
1536	///
1537	/// This class lets you emit either a regular diagnostic, a deferred
1538	/// diagnostic, or no diagnostic at all, according to an argument you pass to
1539	/// its constructor, thus simplifying the process of creating these "maybe
1540	/// deferred" diagnostics.
1541	class SemaDiagnosticBuilder {
1542	public:
1543	enum Kind {
1544	/// Emit no diagnostics.
1545	K_Nop,
1546	/// Emit the diagnostic immediately (i.e., behave like Sema::Diag()).
1547	K_Immediate,
1548	/// Emit the diagnostic immediately, and, if it's a warning or error, also
1549	/// emit a call stack showing how this function can be reached by an a
1550	/// priori known-emitted function.
1551	K_ImmediateWithCallStack,
1552	/// Create a deferred diagnostic, which is emitted only if the function
1553	/// it's attached to is codegen'ed. Also emit a call stack as with
1554	/// K_ImmediateWithCallStack.
1555	K_Deferred
1556	};
1557
1558	SemaDiagnosticBuilder(Kind K, SourceLocation Loc, unsigned DiagID,
1559	FunctionDecl *Fn, Sema &S);
1560	SemaDiagnosticBuilder(SemaDiagnosticBuilder &&D);
1561	SemaDiagnosticBuilder(const SemaDiagnosticBuilder &) = default;
1562	~SemaDiagnosticBuilder();
1563
1564	bool isImmediate() const { return ImmediateDiag.hasValue(); }
1565
1566	/// Convertible to bool: True if we immediately emitted an error, false if
1567	/// we didn't emit an error or we created a deferred error.
1568	///
1569	/// Example usage:
1570	///
1571	/// if (SemaDiagnosticBuilder(...) << foo << bar)
1572	/// return ExprError();
1573	///
1574	/// But see CUDADiagIfDeviceCode() and CUDADiagIfHostCode() -- you probably
1575	/// want to use these instead of creating a SemaDiagnosticBuilder yourself.
1576	operator bool() const { return isImmediate(); }
1577
1578	template <typename T>
1579	friend const SemaDiagnosticBuilder &
1580	operator<<(const SemaDiagnosticBuilder &Diag, const T &Value) {
1581	if (Diag.ImmediateDiag.hasValue())
1582	*Diag.ImmediateDiag << Value;
1583	else if (Diag.PartialDiagId.hasValue())
1584	Diag.S.DeviceDeferredDiags[Diag.Fn][*Diag.PartialDiagId].second
1585	<< Value;
1586	return Diag;
1587	}
1588
1589	// It is necessary to limit this to rvalue reference to avoid calling this
1590	// function with a bitfield lvalue argument since non-const reference to
1591	// bitfield is not allowed.
1592	template <typename T, typename = typename std::enable_if<
1593	!std::is_lvalue_reference<T>::value>::type>
1594	const SemaDiagnosticBuilder &operator<<(T &&V) const {
1595	if (ImmediateDiag.hasValue())
1596	*ImmediateDiag << std::move(V);
1597	else if (PartialDiagId.hasValue())
1598	S.DeviceDeferredDiags[Fn][*PartialDiagId].second << std::move(V);
1599	return *this;
1600	}
1601
1602	friend const SemaDiagnosticBuilder &
1603	operator<<(const SemaDiagnosticBuilder &Diag, const PartialDiagnostic &PD) {
1604	if (Diag.ImmediateDiag.hasValue())
1605	PD.Emit(*Diag.ImmediateDiag);
1606	else if (Diag.PartialDiagId.hasValue())
1607	Diag.S.DeviceDeferredDiags[Diag.Fn][*Diag.PartialDiagId].second = PD;
1608	return Diag;
1609	}
1610
1611	void AddFixItHint(const FixItHint &Hint) const {
1612	if (ImmediateDiag.hasValue())
1613	ImmediateDiag->AddFixItHint(Hint);
1614	else if (PartialDiagId.hasValue())
1615	S.DeviceDeferredDiags[Fn][*PartialDiagId].second.AddFixItHint(Hint);
1616	}
1617
1618	friend ExprResult ExprError(const SemaDiagnosticBuilder &) {
1619	return ExprError();
1620	}
1621	friend StmtResult StmtError(const SemaDiagnosticBuilder &) {
1622	return StmtError();
1623	}
1624	operator ExprResult() const { return ExprError(); }
1625	operator StmtResult() const { return StmtError(); }
1626	operator TypeResult() const { return TypeError(); }
1627	operator DeclResult() const { return DeclResult(true); }
1628	operator MemInitResult() const { return MemInitResult(true); }
1629
1630	private:
1631	Sema &S;
1632	SourceLocation Loc;
1633	unsigned DiagID;
1634	FunctionDecl *Fn;
1635	bool ShowCallStack;
1636
1637	// Invariant: At most one of these Optionals has a value.
1638	// FIXME: Switch these to a Variant once that exists.
1639	llvm::Optional<ImmediateDiagBuilder> ImmediateDiag;
1640	llvm::Optional<unsigned> PartialDiagId;
1641	};
1642	using DiagBuilderT = SemaDiagnosticBuilder;
1643
1644	/// Is the last error level diagnostic immediate. This is used to determined
1645	/// whether the next info diagnostic should be immediate.
1646	bool IsLastErrorImmediate = true;
1647
1648	/// Emit a diagnostic.
1649	SemaDiagnosticBuilder Diag(SourceLocation Loc, unsigned DiagID,
1650	bool DeferHint = false);
1651
1652	/// Emit a partial diagnostic.
1653	SemaDiagnosticBuilder Diag(SourceLocation Loc, const PartialDiagnostic &PD,
1654	bool DeferHint = false);
1655
1656	/// Build a partial diagnostic.
1657	PartialDiagnostic PDiag(unsigned DiagID = 0); // in SemaInternal.h
1658
1659	/// Whether uncompilable error has occurred. This includes error happens
1660	/// in deferred diagnostics.
1661	bool hasUncompilableErrorOccurred() const;
1662
1663	bool findMacroSpelling(SourceLocation &loc, StringRef name);
1664
1665	/// Get a string to suggest for zero-initialization of a type.
1666	std::string
1667	getFixItZeroInitializerForType(QualType T, SourceLocation Loc) const;
1668	std::string getFixItZeroLiteralForType(QualType T, SourceLocation Loc) const;
1669
1670	/// Calls \c Lexer::getLocForEndOfToken()
1671	SourceLocation getLocForEndOfToken(SourceLocation Loc, unsigned Offset = 0);
1672
1673	/// Retrieve the module loader associated with the preprocessor.
1674	ModuleLoader &getModuleLoader() const;
1675
1676	/// Invent a new identifier for parameters of abbreviated templates.
1677	IdentifierInfo *
1678	InventAbbreviatedTemplateParameterTypeName(IdentifierInfo *ParamName,
1679	unsigned Index);
1680
1681	void emitAndClearUnusedLocalTypedefWarnings();
1682
1683	private:
1684	/// Function or variable declarations to be checked for whether the deferred
1685	/// diagnostics should be emitted.
1686	SmallVector<Decl *, 4> DeclsToCheckForDeferredDiags;
1687
1688	public:
1689	// Emit all deferred diagnostics.
1690	void emitDeferredDiags();
1691
1692	enum TUFragmentKind {
1693	/// The global module fragment, between 'module;' and a module-declaration.
1694	Global,
1695	/// A normal translation unit fragment. For a non-module unit, this is the
1696	/// entire translation unit. Otherwise, it runs from the module-declaration
1697	/// to the private-module-fragment (if any) or the end of the TU (if not).
1698	Normal,
1699	/// The private module fragment, between 'module :private;' and the end of
1700	/// the translation unit.
1701	Private
1702	};
1703
1704	void ActOnStartOfTranslationUnit();
1705	void ActOnEndOfTranslationUnit();
1706	void ActOnEndOfTranslationUnitFragment(TUFragmentKind Kind);
1707
1708	void CheckDelegatingCtorCycles();
1709
1710	Scope getScopeForContext(DeclContext Ctx);
1711
1712	void PushFunctionScope();
1713	void PushBlockScope(Scope BlockScope, BlockDecl Block);
1714	sema::LambdaScopeInfo *PushLambdaScope();
1715
1716	/// This is used to inform Sema what the current TemplateParameterDepth
1717	/// is during Parsing. Currently it is used to pass on the depth
1718	/// when parsing generic lambda 'auto' parameters.
1719	void RecordParsingTemplateParameterDepth(unsigned Depth);
1720
1721	void PushCapturedRegionScope(Scope RegionScope, CapturedDecl CD,
1722	RecordDecl *RD, CapturedRegionKind K,
1723	unsigned OpenMPCaptureLevel = 0);
1724
1725	/// Custom deleter to allow FunctionScopeInfos to be kept alive for a short
1726	/// time after they've been popped.
1727	class PoppedFunctionScopeDeleter {
1728	Sema *Self;
1729
1730	public:
1731	explicit PoppedFunctionScopeDeleter(Sema *Self) : Self(Self) {}
1732	void operator()(sema::FunctionScopeInfo *Scope) const;
1733	};
1734
1735	using PoppedFunctionScopePtr =
1736	std::unique_ptr<sema::FunctionScopeInfo, PoppedFunctionScopeDeleter>;
1737
1738	PoppedFunctionScopePtr
1739	PopFunctionScopeInfo(const sema::AnalysisBasedWarnings::Policy *WP = nullptr,
1740	const Decl *D = nullptr,
1741	QualType BlockType = QualType());
1742
1743	sema::FunctionScopeInfo *getCurFunction() const {
1744	return FunctionScopes.empty() ? nullptr : FunctionScopes.back();
1745	}
1746
1747	sema::FunctionScopeInfo *getEnclosingFunction() const;
1748
1749	void setFunctionHasBranchIntoScope();
1750	void setFunctionHasBranchProtectedScope();
1751	void setFunctionHasIndirectGoto();
1752
1753	void PushCompoundScope(bool IsStmtExpr);
1754	void PopCompoundScope();
1755
1756	sema::CompoundScopeInfo &getCurCompoundScope() const;
1757
1758	bool hasAnyUnrecoverableErrorsInThisFunction() const;
1759
1760	/// Retrieve the current block, if any.
1761	sema::BlockScopeInfo *getCurBlock();
1762
1763	/// Get the innermost lambda enclosing the current location, if any. This
1764	/// looks through intervening non-lambda scopes such as local functions and
1765	/// blocks.
1766	sema::LambdaScopeInfo *getEnclosingLambda() const;
1767
1768	/// Retrieve the current lambda scope info, if any.
1769	/// \param IgnoreNonLambdaCapturingScope true if should find the top-most
1770	/// lambda scope info ignoring all inner capturing scopes that are not
1771	/// lambda scopes.
1772	sema::LambdaScopeInfo *
1773	getCurLambda(bool IgnoreNonLambdaCapturingScope = false);
1774
1775	/// Retrieve the current generic lambda info, if any.
1776	sema::LambdaScopeInfo *getCurGenericLambda();
1777
1778	/// Retrieve the current captured region, if any.
1779	sema::CapturedRegionScopeInfo *getCurCapturedRegion();
1780
1781	/// WeakTopLevelDeclDecls - access to \#pragma weak-generated Decls
1782	SmallVectorImpl<Decl *> &WeakTopLevelDecls() { return WeakTopLevelDecl; }
1783
1784	/// Called before parsing a function declarator belonging to a function
1785	/// declaration.
1786	void ActOnStartFunctionDeclarationDeclarator(Declarator &D,
1787	unsigned TemplateParameterDepth);
1788
1789	/// Called after parsing a function declarator belonging to a function
1790	/// declaration.
1791	void ActOnFinishFunctionDeclarationDeclarator(Declarator &D);
1792
1793	void ActOnComment(SourceRange Comment);
1794
1795	//===--------------------------------------------------------------------===//
1796	// Type Analysis / Processing: SemaType.cpp.
1797	//
1798
1799	QualType BuildQualifiedType(QualType T, SourceLocation Loc, Qualifiers Qs,
1800	const DeclSpec *DS = nullptr);
1801	QualType BuildQualifiedType(QualType T, SourceLocation Loc, unsigned CVRA,
1802	const DeclSpec *DS = nullptr);
1803	QualType BuildPointerType(QualType T,
1804	SourceLocation Loc, DeclarationName Entity);
1805	QualType BuildReferenceType(QualType T, bool LValueRef,
1806	SourceLocation Loc, DeclarationName Entity);
1807	QualType BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM,
1808	Expr *ArraySize, unsigned Quals,
1809	SourceRange Brackets, DeclarationName Entity);
1810	QualType BuildVectorType(QualType T, Expr *VecSize, SourceLocation AttrLoc);
1811	QualType BuildExtVectorType(QualType T, Expr *ArraySize,
1812	SourceLocation AttrLoc);
1813	QualType BuildMatrixType(QualType T, Expr NumRows, Expr NumColumns,
1814	SourceLocation AttrLoc);
1815
1816	QualType BuildAddressSpaceAttr(QualType &T, LangAS ASIdx, Expr *AddrSpace,
1817	SourceLocation AttrLoc);
1818
1819	/// Same as above, but constructs the AddressSpace index if not provided.
1820	QualType BuildAddressSpaceAttr(QualType &T, Expr *AddrSpace,
1821	SourceLocation AttrLoc);
1822
1823	bool CheckQualifiedFunctionForTypeId(QualType T, SourceLocation Loc);
1824
1825	bool CheckFunctionReturnType(QualType T, SourceLocation Loc);
1826
1827	/// Build a function type.
1828	///
1829	/// This routine checks the function type according to C++ rules and
1830	/// under the assumption that the result type and parameter types have
1831	/// just been instantiated from a template. It therefore duplicates
1832	/// some of the behavior of GetTypeForDeclarator, but in a much
1833	/// simpler form that is only suitable for this narrow use case.
1834	///
1835	/// \param T The return type of the function.
1836	///
1837	/// \param ParamTypes The parameter types of the function. This array
1838	/// will be modified to account for adjustments to the types of the
1839	/// function parameters.
1840	///
1841	/// \param Loc The location of the entity whose type involves this
1842	/// function type or, if there is no such entity, the location of the
1843	/// type that will have function type.
1844	///
1845	/// \param Entity The name of the entity that involves the function
1846	/// type, if known.
1847	///
1848	/// \param EPI Extra information about the function type. Usually this will
1849	/// be taken from an existing function with the same prototype.
1850	///
1851	/// \returns A suitable function type, if there are no errors. The
1852	/// unqualified type will always be a FunctionProtoType.
1853	/// Otherwise, returns a NULL type.
1854	QualType BuildFunctionType(QualType T,
1855	MutableArrayRef<QualType> ParamTypes,
1856	SourceLocation Loc, DeclarationName Entity,
1857	const FunctionProtoType::ExtProtoInfo &EPI);
1858
1859	QualType BuildMemberPointerType(QualType T, QualType Class,
1860	SourceLocation Loc,
1861	DeclarationName Entity);
1862	QualType BuildBlockPointerType(QualType T,
1863	SourceLocation Loc, DeclarationName Entity);
1864	QualType BuildParenType(QualType T);
1865	QualType BuildAtomicType(QualType T, SourceLocation Loc);
1866	QualType BuildReadPipeType(QualType T,
1867	SourceLocation Loc);
1868	QualType BuildWritePipeType(QualType T,
1869	SourceLocation Loc);
1870	QualType BuildExtIntType(bool IsUnsigned, Expr *BitWidth, SourceLocation Loc);
1871
1872	TypeSourceInfo GetTypeForDeclarator(Declarator &D, Scope S);
1873	TypeSourceInfo *GetTypeForDeclaratorCast(Declarator &D, QualType FromTy);
1874
1875	/// Package the given type and TSI into a ParsedType.
1876	ParsedType CreateParsedType(QualType T, TypeSourceInfo *TInfo);
1877	DeclarationNameInfo GetNameForDeclarator(Declarator &D);
1878	DeclarationNameInfo GetNameFromUnqualifiedId(const UnqualifiedId &Name);
1879	static QualType GetTypeFromParser(ParsedType Ty,
1880	TypeSourceInfo **TInfo = nullptr);
1881	CanThrowResult canThrow(const Stmt *E);
1882	/// Determine whether the callee of a particular function call can throw.
1883	/// E, D and Loc are all optional.
1884	static CanThrowResult canCalleeThrow(Sema &S, const Expr E, const Decl D,
1885	SourceLocation Loc = SourceLocation());
1886	const FunctionProtoType *ResolveExceptionSpec(SourceLocation Loc,
1887	const FunctionProtoType *FPT);
1888	void UpdateExceptionSpec(FunctionDecl *FD,
1889	const FunctionProtoType::ExceptionSpecInfo &ESI);
1890	bool CheckSpecifiedExceptionType(QualType &T, SourceRange Range);
1891	bool CheckDistantExceptionSpec(QualType T);
1892	bool CheckEquivalentExceptionSpec(FunctionDecl Old, FunctionDecl New);
1893	bool CheckEquivalentExceptionSpec(
1894	const FunctionProtoType *Old, SourceLocation OldLoc,
1895	const FunctionProtoType *New, SourceLocation NewLoc);
1896	bool CheckEquivalentExceptionSpec(
1897	const PartialDiagnostic &DiagID, const PartialDiagnostic & NoteID,
1898	const FunctionProtoType *Old, SourceLocation OldLoc,
1899	const FunctionProtoType *New, SourceLocation NewLoc);
1900	bool handlerCanCatch(QualType HandlerType, QualType ExceptionType);
1901	bool CheckExceptionSpecSubset(const PartialDiagnostic &DiagID,
1902	const PartialDiagnostic &NestedDiagID,
1903	const PartialDiagnostic &NoteID,
1904	const PartialDiagnostic &NoThrowDiagID,
1905	const FunctionProtoType *Superset,
1906	SourceLocation SuperLoc,
1907	const FunctionProtoType *Subset,
1908	SourceLocation SubLoc);
1909	bool CheckParamExceptionSpec(const PartialDiagnostic &NestedDiagID,
1910	const PartialDiagnostic &NoteID,
1911	const FunctionProtoType *Target,
1912	SourceLocation TargetLoc,
1913	const FunctionProtoType *Source,
1914	SourceLocation SourceLoc);
1915
1916	TypeResult ActOnTypeName(Scope *S, Declarator &D);
1917
1918	/// The parser has parsed the context-sensitive type 'instancetype'
1919	/// in an Objective-C message declaration. Return the appropriate type.
1920	ParsedType ActOnObjCInstanceType(SourceLocation Loc);
1921
1922	/// Abstract class used to diagnose incomplete types.
1923	struct TypeDiagnoser {
1924	TypeDiagnoser() {}
1925
1926	virtual void diagnose(Sema &S, SourceLocation Loc, QualType T) = 0;
1927	virtual ~TypeDiagnoser() {}
1928	};
1929
1930	static int getPrintable(int I) { return I; }
1931	static unsigned getPrintable(unsigned I) { return I; }
1932	static bool getPrintable(bool B) { return B; }
1933	static const char * getPrintable(const char *S) { return S; }
1934	static StringRef getPrintable(StringRef S) { return S; }
1935	static const std::string &getPrintable(const std::string &S) { return S; }
1936	static const IdentifierInfo getPrintable(const IdentifierInfo II) {
1937	return II;
1938	}
1939	static DeclarationName getPrintable(DeclarationName N) { return N; }
1940	static QualType getPrintable(QualType T) { return T; }
1941	static SourceRange getPrintable(SourceRange R) { return R; }
1942	static SourceRange getPrintable(SourceLocation L) { return L; }
1943	static SourceRange getPrintable(const Expr *E) { return E->getSourceRange(); }
1944	static SourceRange getPrintable(TypeLoc TL) { return TL.getSourceRange();}
1945
1946	template <typename... Ts> class BoundTypeDiagnoser : public TypeDiagnoser {
1947	protected:
1948	unsigned DiagID;
1949	std::tuple<const Ts &...> Args;
1950
1951	template <std::size_t... Is>
1952	void emit(const SemaDiagnosticBuilder &DB,
1953	std::index_sequence<Is...>) const {
1954	// Apply all tuple elements to the builder in order.
1955	bool Dummy[] = {false, (DB << getPrintable(std::get<Is>(Args)))...};
1956	(void)Dummy;
1957	}
1958
1959	public:
1960	BoundTypeDiagnoser(unsigned DiagID, const Ts &...Args)
1961	: TypeDiagnoser(), DiagID(DiagID), Args(Args...) {
1962	assert(DiagID != 0 && "no diagnostic for type diagnoser")((DiagID != 0 && "no diagnostic for type diagnoser") ? static_cast<void> (0) : __assert_fail ("DiagID != 0 && \"no diagnostic for type diagnoser\"" , "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/include/clang/Sema/Sema.h" , 1962, __PRETTY_FUNCTION__));
1963	}
1964
1965	void diagnose(Sema &S, SourceLocation Loc, QualType T) override {
1966	const SemaDiagnosticBuilder &DB = S.Diag(Loc, DiagID);
1967	emit(DB, std::index_sequence_for<Ts...>());
1968	DB << T;
1969	}
1970	};
1971
1972	/// Do a check to make sure \p Name looks like a legal argument for the
1973	/// swift_name attribute applied to decl \p D. Raise a diagnostic if the name
1974	/// is invalid for the given declaration.
1975	///
1976	/// \p AL is used to provide caret diagnostics in case of a malformed name.
1977	///
1978	/// \returns true if the name is a valid swift name for \p D, false otherwise.
1979	bool DiagnoseSwiftName(Decl *D, StringRef Name, SourceLocation Loc,
1980	const ParsedAttr &AL);
1981
1982	/// A derivative of BoundTypeDiagnoser for which the diagnostic's type
1983	/// parameter is preceded by a 0/1 enum that is 1 if the type is sizeless.
1984	/// For example, a diagnostic with no other parameters would generally have
1985	/// the form "...%select{incomplete\|sizeless}0 type %1...".
1986	template <typename... Ts>
1987	class SizelessTypeDiagnoser : public BoundTypeDiagnoser<Ts...> {
1988	public:
1989	SizelessTypeDiagnoser(unsigned DiagID, const Ts &... Args)
1990	: BoundTypeDiagnoser<Ts...>(DiagID, Args...) {}
1991
1992	void diagnose(Sema &S, SourceLocation Loc, QualType T) override {
1993	const SemaDiagnosticBuilder &DB = S.Diag(Loc, this->DiagID);
1994	this->emit(DB, std::index_sequence_for<Ts...>());
1995	DB << T->isSizelessType() << T;
1996	}
1997	};
1998
1999	enum class CompleteTypeKind {
2000	/// Apply the normal rules for complete types. In particular,
2001	/// treat all sizeless types as incomplete.
2002	Normal,
2003
2004	/// Relax the normal rules for complete types so that they include
2005	/// sizeless built-in types.
2006	AcceptSizeless,
2007
2008	// FIXME: Eventually we should flip the default to Normal and opt in
2009	// to AcceptSizeless rather than opt out of it.
2010	Default = AcceptSizeless
2011	};
2012