Bug Summary

File:tools/clang/lib/CodeGen/CGCall.cpp
Warning:line 2268, column 33
Called C++ object pointer is null

Annotated Source Code

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clang -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name CGCall.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-eagerly-assume -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 -mrelocation-model pic -pic-level 2 -mthread-model posix -relaxed-aliasing -fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64 -dwarf-column-info -debugger-tuning=gdb -momit-leaf-frame-pointer -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-7/lib/clang/7.0.0 -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-7~svn329677/build-llvm/tools/clang/lib/CodeGen -I /build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen -I /build/llvm-toolchain-snapshot-7~svn329677/tools/clang/include -I /build/llvm-toolchain-snapshot-7~svn329677/build-llvm/tools/clang/include -I /build/llvm-toolchain-snapshot-7~svn329677/build-llvm/include -I /build/llvm-toolchain-snapshot-7~svn329677/include -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/c++/7.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/x86_64-linux-gnu/c++/7.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/x86_64-linux-gnu/c++/7.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/c++/7.3.0/backward -internal-isystem /usr/include/clang/7.0.0/include/ -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-7/lib/clang/7.0.0/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++11 -fdeprecated-macro -fdebug-compilation-dir /build/llvm-toolchain-snapshot-7~svn329677/build-llvm/tools/clang/lib/CodeGen -ferror-limit 19 -fmessage-length 0 -fvisibility-inlines-hidden -fobjc-runtime=gcc -fno-common -fdiagnostics-show-option -vectorize-loops -vectorize-slp -analyzer-checker optin.performance.Padding -analyzer-output=html -analyzer-config stable-report-filename=true -o /tmp/scan-build-2018-04-11-031539-24776-1 -x c++ /build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp
1//===--- CGCall.cpp - Encapsulate calling convention details --------------===//
2//
3// The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// These classes wrap the information about a call or function
11// definition used to handle ABI compliancy.
12//
13//===----------------------------------------------------------------------===//
14
15#include "CGCall.h"
16#include "ABIInfo.h"
17#include "CGBlocks.h"
18#include "CGCXXABI.h"
19#include "CGCleanup.h"
20#include "CodeGenFunction.h"
21#include "CodeGenModule.h"
22#include "TargetInfo.h"
23#include "clang/AST/Decl.h"
24#include "clang/AST/DeclCXX.h"
25#include "clang/AST/DeclObjC.h"
26#include "clang/Basic/TargetBuiltins.h"
27#include "clang/Basic/TargetInfo.h"
28#include "clang/CodeGen/CGFunctionInfo.h"
29#include "clang/CodeGen/SwiftCallingConv.h"
30#include "clang/Frontend/CodeGenOptions.h"
31#include "llvm/ADT/StringExtras.h"
32#include "llvm/Analysis/Utils/Local.h"
33#include "llvm/Analysis/ValueTracking.h"
34#include "llvm/IR/Attributes.h"
35#include "llvm/IR/CallSite.h"
36#include "llvm/IR/CallingConv.h"
37#include "llvm/IR/DataLayout.h"
38#include "llvm/IR/InlineAsm.h"
39#include "llvm/IR/IntrinsicInst.h"
40#include "llvm/IR/Intrinsics.h"
41using namespace clang;
42using namespace CodeGen;
43
44/***/
45
46unsigned CodeGenTypes::ClangCallConvToLLVMCallConv(CallingConv CC) {
47 switch (CC) {
48 default: return llvm::CallingConv::C;
49 case CC_X86StdCall: return llvm::CallingConv::X86_StdCall;
50 case CC_X86FastCall: return llvm::CallingConv::X86_FastCall;
51 case CC_X86RegCall: return llvm::CallingConv::X86_RegCall;
52 case CC_X86ThisCall: return llvm::CallingConv::X86_ThisCall;
53 case CC_Win64: return llvm::CallingConv::Win64;
54 case CC_X86_64SysV: return llvm::CallingConv::X86_64_SysV;
55 case CC_AAPCS: return llvm::CallingConv::ARM_AAPCS;
56 case CC_AAPCS_VFP: return llvm::CallingConv::ARM_AAPCS_VFP;
57 case CC_IntelOclBicc: return llvm::CallingConv::Intel_OCL_BI;
58 // TODO: Add support for __pascal to LLVM.
59 case CC_X86Pascal: return llvm::CallingConv::C;
60 // TODO: Add support for __vectorcall to LLVM.
61 case CC_X86VectorCall: return llvm::CallingConv::X86_VectorCall;
62 case CC_SpirFunction: return llvm::CallingConv::SPIR_FUNC;
63 case CC_OpenCLKernel: return CGM.getTargetCodeGenInfo().getOpenCLKernelCallingConv();
64 case CC_PreserveMost: return llvm::CallingConv::PreserveMost;
65 case CC_PreserveAll: return llvm::CallingConv::PreserveAll;
66 case CC_Swift: return llvm::CallingConv::Swift;
67 }
68}
69
70/// Derives the 'this' type for codegen purposes, i.e. ignoring method
71/// qualification.
72/// FIXME: address space qualification?
73static CanQualType GetThisType(ASTContext &Context, const CXXRecordDecl *RD) {
74 QualType RecTy = Context.getTagDeclType(RD)->getCanonicalTypeInternal();
75 return Context.getPointerType(CanQualType::CreateUnsafe(RecTy));
76}
77
78/// Returns the canonical formal type of the given C++ method.
79static CanQual<FunctionProtoType> GetFormalType(const CXXMethodDecl *MD) {
80 return MD->getType()->getCanonicalTypeUnqualified()
81 .getAs<FunctionProtoType>();
82}
83
84/// Returns the "extra-canonicalized" return type, which discards
85/// qualifiers on the return type. Codegen doesn't care about them,
86/// and it makes ABI code a little easier to be able to assume that
87/// all parameter and return types are top-level unqualified.
88static CanQualType GetReturnType(QualType RetTy) {
89 return RetTy->getCanonicalTypeUnqualified().getUnqualifiedType();
90}
91
92/// Arrange the argument and result information for a value of the given
93/// unprototyped freestanding function type.
94const CGFunctionInfo &
95CodeGenTypes::arrangeFreeFunctionType(CanQual<FunctionNoProtoType> FTNP) {
96 // When translating an unprototyped function type, always use a
97 // variadic type.
98 return arrangeLLVMFunctionInfo(FTNP->getReturnType().getUnqualifiedType(),
99 /*instanceMethod=*/false,
100 /*chainCall=*/false, None,
101 FTNP->getExtInfo(), {}, RequiredArgs(0));
102}
103
104static void addExtParameterInfosForCall(
105 llvm::SmallVectorImpl<FunctionProtoType::ExtParameterInfo> &paramInfos,
106 const FunctionProtoType *proto,
107 unsigned prefixArgs,
108 unsigned totalArgs) {
109 assert(proto->hasExtParameterInfos())(static_cast <bool> (proto->hasExtParameterInfos()) ?
void (0) : __assert_fail ("proto->hasExtParameterInfos()"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 109, __extension__ __PRETTY_FUNCTION__))
;
110 assert(paramInfos.size() <= prefixArgs)(static_cast <bool> (paramInfos.size() <= prefixArgs
) ? void (0) : __assert_fail ("paramInfos.size() <= prefixArgs"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 110, __extension__ __PRETTY_FUNCTION__))
;
111 assert(proto->getNumParams() + prefixArgs <= totalArgs)(static_cast <bool> (proto->getNumParams() + prefixArgs
<= totalArgs) ? void (0) : __assert_fail ("proto->getNumParams() + prefixArgs <= totalArgs"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 111, __extension__ __PRETTY_FUNCTION__))
;
112
113 paramInfos.reserve(totalArgs);
114
115 // Add default infos for any prefix args that don't already have infos.
116 paramInfos.resize(prefixArgs);
117
118 // Add infos for the prototype.
119 for (const auto &ParamInfo : proto->getExtParameterInfos()) {
120 paramInfos.push_back(ParamInfo);
121 // pass_object_size params have no parameter info.
122 if (ParamInfo.hasPassObjectSize())
123 paramInfos.emplace_back();
124 }
125
126 assert(paramInfos.size() <= totalArgs &&(static_cast <bool> (paramInfos.size() <= totalArgs &&
"Did we forget to insert pass_object_size args?") ? void (0)
: __assert_fail ("paramInfos.size() <= totalArgs && \"Did we forget to insert pass_object_size args?\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 127, __extension__ __PRETTY_FUNCTION__))
127 "Did we forget to insert pass_object_size args?")(static_cast <bool> (paramInfos.size() <= totalArgs &&
"Did we forget to insert pass_object_size args?") ? void (0)
: __assert_fail ("paramInfos.size() <= totalArgs && \"Did we forget to insert pass_object_size args?\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 127, __extension__ __PRETTY_FUNCTION__))
;
128 // Add default infos for the variadic and/or suffix arguments.
129 paramInfos.resize(totalArgs);
130}
131
132/// Adds the formal parameters in FPT to the given prefix. If any parameter in
133/// FPT has pass_object_size attrs, then we'll add parameters for those, too.
134static void appendParameterTypes(const CodeGenTypes &CGT,
135 SmallVectorImpl<CanQualType> &prefix,
136 SmallVectorImpl<FunctionProtoType::ExtParameterInfo> &paramInfos,
137 CanQual<FunctionProtoType> FPT) {
138 // Fast path: don't touch param info if we don't need to.
139 if (!FPT->hasExtParameterInfos()) {
140 assert(paramInfos.empty() &&(static_cast <bool> (paramInfos.empty() && "We have paramInfos, but the prototype doesn't?"
) ? void (0) : __assert_fail ("paramInfos.empty() && \"We have paramInfos, but the prototype doesn't?\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 141, __extension__ __PRETTY_FUNCTION__))
141 "We have paramInfos, but the prototype doesn't?")(static_cast <bool> (paramInfos.empty() && "We have paramInfos, but the prototype doesn't?"
) ? void (0) : __assert_fail ("paramInfos.empty() && \"We have paramInfos, but the prototype doesn't?\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 141, __extension__ __PRETTY_FUNCTION__))
;
142 prefix.append(FPT->param_type_begin(), FPT->param_type_end());
143 return;
144 }
145
146 unsigned PrefixSize = prefix.size();
147 // In the vast majority of cases, we'll have precisely FPT->getNumParams()
148 // parameters; the only thing that can change this is the presence of
149 // pass_object_size. So, we preallocate for the common case.
150 prefix.reserve(prefix.size() + FPT->getNumParams());
151
152 auto ExtInfos = FPT->getExtParameterInfos();
153 assert(ExtInfos.size() == FPT->getNumParams())(static_cast <bool> (ExtInfos.size() == FPT->getNumParams
()) ? void (0) : __assert_fail ("ExtInfos.size() == FPT->getNumParams()"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 153, __extension__ __PRETTY_FUNCTION__))
;
154 for (unsigned I = 0, E = FPT->getNumParams(); I != E; ++I) {
155 prefix.push_back(FPT->getParamType(I));
156 if (ExtInfos[I].hasPassObjectSize())
157 prefix.push_back(CGT.getContext().getSizeType());
158 }
159
160 addExtParameterInfosForCall(paramInfos, FPT.getTypePtr(), PrefixSize,
161 prefix.size());
162}
163
164/// Arrange the LLVM function layout for a value of the given function
165/// type, on top of any implicit parameters already stored.
166static const CGFunctionInfo &
167arrangeLLVMFunctionInfo(CodeGenTypes &CGT, bool instanceMethod,
168 SmallVectorImpl<CanQualType> &prefix,
169 CanQual<FunctionProtoType> FTP,
170 const FunctionDecl *FD) {
171 SmallVector<FunctionProtoType::ExtParameterInfo, 16> paramInfos;
172 RequiredArgs Required =
173 RequiredArgs::forPrototypePlus(FTP, prefix.size(), FD);
174 // FIXME: Kill copy.
175 appendParameterTypes(CGT, prefix, paramInfos, FTP);
176 CanQualType resultType = FTP->getReturnType().getUnqualifiedType();
177
178 return CGT.arrangeLLVMFunctionInfo(resultType, instanceMethod,
179 /*chainCall=*/false, prefix,
180 FTP->getExtInfo(), paramInfos,
181 Required);
182}
183
184/// Arrange the argument and result information for a value of the
185/// given freestanding function type.
186const CGFunctionInfo &
187CodeGenTypes::arrangeFreeFunctionType(CanQual<FunctionProtoType> FTP,
188 const FunctionDecl *FD) {
189 SmallVector<CanQualType, 16> argTypes;
190 return ::arrangeLLVMFunctionInfo(*this, /*instanceMethod=*/false, argTypes,
191 FTP, FD);
192}
193
194static CallingConv getCallingConventionForDecl(const Decl *D, bool IsWindows) {
195 // Set the appropriate calling convention for the Function.
196 if (D->hasAttr<StdCallAttr>())
197 return CC_X86StdCall;
198
199 if (D->hasAttr<FastCallAttr>())
200 return CC_X86FastCall;
201
202 if (D->hasAttr<RegCallAttr>())
203 return CC_X86RegCall;
204
205 if (D->hasAttr<ThisCallAttr>())
206 return CC_X86ThisCall;
207
208 if (D->hasAttr<VectorCallAttr>())
209 return CC_X86VectorCall;
210
211 if (D->hasAttr<PascalAttr>())
212 return CC_X86Pascal;
213
214 if (PcsAttr *PCS = D->getAttr<PcsAttr>())
215 return (PCS->getPCS() == PcsAttr::AAPCS ? CC_AAPCS : CC_AAPCS_VFP);
216
217 if (D->hasAttr<IntelOclBiccAttr>())
218 return CC_IntelOclBicc;
219
220 if (D->hasAttr<MSABIAttr>())
221 return IsWindows ? CC_C : CC_Win64;
222
223 if (D->hasAttr<SysVABIAttr>())
224 return IsWindows ? CC_X86_64SysV : CC_C;
225
226 if (D->hasAttr<PreserveMostAttr>())
227 return CC_PreserveMost;
228
229 if (D->hasAttr<PreserveAllAttr>())
230 return CC_PreserveAll;
231
232 return CC_C;
233}
234
235/// Arrange the argument and result information for a call to an
236/// unknown C++ non-static member function of the given abstract type.
237/// (Zero value of RD means we don't have any meaningful "this" argument type,
238/// so fall back to a generic pointer type).
239/// The member function must be an ordinary function, i.e. not a
240/// constructor or destructor.
241const CGFunctionInfo &
242CodeGenTypes::arrangeCXXMethodType(const CXXRecordDecl *RD,
243 const FunctionProtoType *FTP,
244 const CXXMethodDecl *MD) {
245 SmallVector<CanQualType, 16> argTypes;
246
247 // Add the 'this' pointer.
248 if (RD)
249 argTypes.push_back(GetThisType(Context, RD));
250 else
251 argTypes.push_back(Context.VoidPtrTy);
252
253 return ::arrangeLLVMFunctionInfo(
254 *this, true, argTypes,
255 FTP->getCanonicalTypeUnqualified().getAs<FunctionProtoType>(), MD);
256}
257
258/// Arrange the argument and result information for a declaration or
259/// definition of the given C++ non-static member function. The
260/// member function must be an ordinary function, i.e. not a
261/// constructor or destructor.
262const CGFunctionInfo &
263CodeGenTypes::arrangeCXXMethodDeclaration(const CXXMethodDecl *MD) {
264 assert(!isa<CXXConstructorDecl>(MD) && "wrong method for constructors!")(static_cast <bool> (!isa<CXXConstructorDecl>(MD)
&& "wrong method for constructors!") ? void (0) : __assert_fail
("!isa<CXXConstructorDecl>(MD) && \"wrong method for constructors!\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 264, __extension__ __PRETTY_FUNCTION__))
;
265 assert(!isa<CXXDestructorDecl>(MD) && "wrong method for destructors!")(static_cast <bool> (!isa<CXXDestructorDecl>(MD) &&
"wrong method for destructors!") ? void (0) : __assert_fail (
"!isa<CXXDestructorDecl>(MD) && \"wrong method for destructors!\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 265, __extension__ __PRETTY_FUNCTION__))
;
266
267 CanQual<FunctionProtoType> prototype = GetFormalType(MD);
268
269 if (MD->isInstance()) {
270 // The abstract case is perfectly fine.
271 const CXXRecordDecl *ThisType = TheCXXABI.getThisArgumentTypeForMethod(MD);
272 return arrangeCXXMethodType(ThisType, prototype.getTypePtr(), MD);
273 }
274
275 return arrangeFreeFunctionType(prototype, MD);
276}
277
278bool CodeGenTypes::inheritingCtorHasParams(
279 const InheritedConstructor &Inherited, CXXCtorType Type) {
280 // Parameters are unnecessary if we're constructing a base class subobject
281 // and the inherited constructor lives in a virtual base.
282 return Type == Ctor_Complete ||
283 !Inherited.getShadowDecl()->constructsVirtualBase() ||
284 !Target.getCXXABI().hasConstructorVariants();
285 }
286
287const CGFunctionInfo &
288CodeGenTypes::arrangeCXXStructorDeclaration(const CXXMethodDecl *MD,
289 StructorType Type) {
290
291 SmallVector<CanQualType, 16> argTypes;
292 SmallVector<FunctionProtoType::ExtParameterInfo, 16> paramInfos;
293 argTypes.push_back(GetThisType(Context, MD->getParent()));
294
295 bool PassParams = true;
296
297 GlobalDecl GD;
298 if (auto *CD = dyn_cast<CXXConstructorDecl>(MD)) {
299 GD = GlobalDecl(CD, toCXXCtorType(Type));
300
301 // A base class inheriting constructor doesn't get forwarded arguments
302 // needed to construct a virtual base (or base class thereof).
303 if (auto Inherited = CD->getInheritedConstructor())
304 PassParams = inheritingCtorHasParams(Inherited, toCXXCtorType(Type));
305 } else {
306 auto *DD = dyn_cast<CXXDestructorDecl>(MD);
307 GD = GlobalDecl(DD, toCXXDtorType(Type));
308 }
309
310 CanQual<FunctionProtoType> FTP = GetFormalType(MD);
311
312 // Add the formal parameters.
313 if (PassParams)
314 appendParameterTypes(*this, argTypes, paramInfos, FTP);
315
316 CGCXXABI::AddedStructorArgs AddedArgs =
317 TheCXXABI.buildStructorSignature(MD, Type, argTypes);
318 if (!paramInfos.empty()) {
319 // Note: prefix implies after the first param.
320 if (AddedArgs.Prefix)
321 paramInfos.insert(paramInfos.begin() + 1, AddedArgs.Prefix,
322 FunctionProtoType::ExtParameterInfo{});
323 if (AddedArgs.Suffix)
324 paramInfos.append(AddedArgs.Suffix,
325 FunctionProtoType::ExtParameterInfo{});
326 }
327
328 RequiredArgs required =
329 (PassParams && MD->isVariadic() ? RequiredArgs(argTypes.size())
330 : RequiredArgs::All);
331
332 FunctionType::ExtInfo extInfo = FTP->getExtInfo();
333 CanQualType resultType = TheCXXABI.HasThisReturn(GD)
334 ? argTypes.front()
335 : TheCXXABI.hasMostDerivedReturn(GD)
336 ? CGM.getContext().VoidPtrTy
337 : Context.VoidTy;
338 return arrangeLLVMFunctionInfo(resultType, /*instanceMethod=*/true,
339 /*chainCall=*/false, argTypes, extInfo,
340 paramInfos, required);
341}
342
343static SmallVector<CanQualType, 16>
344getArgTypesForCall(ASTContext &ctx, const CallArgList &args) {
345 SmallVector<CanQualType, 16> argTypes;
346 for (auto &arg : args)
347 argTypes.push_back(ctx.getCanonicalParamType(arg.Ty));
348 return argTypes;
349}
350
351static SmallVector<CanQualType, 16>
352getArgTypesForDeclaration(ASTContext &ctx, const FunctionArgList &args) {
353 SmallVector<CanQualType, 16> argTypes;
354 for (auto &arg : args)
355 argTypes.push_back(ctx.getCanonicalParamType(arg->getType()));
356 return argTypes;
357}
358
359static llvm::SmallVector<FunctionProtoType::ExtParameterInfo, 16>
360getExtParameterInfosForCall(const FunctionProtoType *proto,
361 unsigned prefixArgs, unsigned totalArgs) {
362 llvm::SmallVector<FunctionProtoType::ExtParameterInfo, 16> result;
363 if (proto->hasExtParameterInfos()) {
364 addExtParameterInfosForCall(result, proto, prefixArgs, totalArgs);
365 }
366 return result;
367}
368
369/// Arrange a call to a C++ method, passing the given arguments.
370///
371/// ExtraPrefixArgs is the number of ABI-specific args passed after the `this`
372/// parameter.
373/// ExtraSuffixArgs is the number of ABI-specific args passed at the end of
374/// args.
375/// PassProtoArgs indicates whether `args` has args for the parameters in the
376/// given CXXConstructorDecl.
377const CGFunctionInfo &
378CodeGenTypes::arrangeCXXConstructorCall(const CallArgList &args,
379 const CXXConstructorDecl *D,
380 CXXCtorType CtorKind,
381 unsigned ExtraPrefixArgs,
382 unsigned ExtraSuffixArgs,
383 bool PassProtoArgs) {
384 // FIXME: Kill copy.
385 SmallVector<CanQualType, 16> ArgTypes;
386 for (const auto &Arg : args)
387 ArgTypes.push_back(Context.getCanonicalParamType(Arg.Ty));
388
389 // +1 for implicit this, which should always be args[0].
390 unsigned TotalPrefixArgs = 1 + ExtraPrefixArgs;
391
392 CanQual<FunctionProtoType> FPT = GetFormalType(D);
393 RequiredArgs Required =
394 RequiredArgs::forPrototypePlus(FPT, TotalPrefixArgs + ExtraSuffixArgs, D);
395 GlobalDecl GD(D, CtorKind);
396 CanQualType ResultType = TheCXXABI.HasThisReturn(GD)
397 ? ArgTypes.front()
398 : TheCXXABI.hasMostDerivedReturn(GD)
399 ? CGM.getContext().VoidPtrTy
400 : Context.VoidTy;
401
402 FunctionType::ExtInfo Info = FPT->getExtInfo();
403 llvm::SmallVector<FunctionProtoType::ExtParameterInfo, 16> ParamInfos;
404 // If the prototype args are elided, we should only have ABI-specific args,
405 // which never have param info.
406 if (PassProtoArgs && FPT->hasExtParameterInfos()) {
407 // ABI-specific suffix arguments are treated the same as variadic arguments.
408 addExtParameterInfosForCall(ParamInfos, FPT.getTypePtr(), TotalPrefixArgs,
409 ArgTypes.size());
410 }
411 return arrangeLLVMFunctionInfo(ResultType, /*instanceMethod=*/true,
412 /*chainCall=*/false, ArgTypes, Info,
413 ParamInfos, Required);
414}
415
416/// Arrange the argument and result information for the declaration or
417/// definition of the given function.
418const CGFunctionInfo &
419CodeGenTypes::arrangeFunctionDeclaration(const FunctionDecl *FD) {
420 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD))
421 if (MD->isInstance())
422 return arrangeCXXMethodDeclaration(MD);
423
424 CanQualType FTy = FD->getType()->getCanonicalTypeUnqualified();
425
426 assert(isa<FunctionType>(FTy))(static_cast <bool> (isa<FunctionType>(FTy)) ? void
(0) : __assert_fail ("isa<FunctionType>(FTy)", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 426, __extension__ __PRETTY_FUNCTION__))
;
427
428 // When declaring a function without a prototype, always use a
429 // non-variadic type.
430 if (CanQual<FunctionNoProtoType> noProto = FTy.getAs<FunctionNoProtoType>()) {
431 return arrangeLLVMFunctionInfo(
432 noProto->getReturnType(), /*instanceMethod=*/false,
433 /*chainCall=*/false, None, noProto->getExtInfo(), {},RequiredArgs::All);
434 }
435
436 return arrangeFreeFunctionType(FTy.castAs<FunctionProtoType>(), FD);
437}
438
439/// Arrange the argument and result information for the declaration or
440/// definition of an Objective-C method.
441const CGFunctionInfo &
442CodeGenTypes::arrangeObjCMethodDeclaration(const ObjCMethodDecl *MD) {
443 // It happens that this is the same as a call with no optional
444 // arguments, except also using the formal 'self' type.
445 return arrangeObjCMessageSendSignature(MD, MD->getSelfDecl()->getType());
446}
447
448/// Arrange the argument and result information for the function type
449/// through which to perform a send to the given Objective-C method,
450/// using the given receiver type. The receiver type is not always
451/// the 'self' type of the method or even an Objective-C pointer type.
452/// This is *not* the right method for actually performing such a
453/// message send, due to the possibility of optional arguments.
454const CGFunctionInfo &
455CodeGenTypes::arrangeObjCMessageSendSignature(const ObjCMethodDecl *MD,
456 QualType receiverType) {
457 SmallVector<CanQualType, 16> argTys;
458 SmallVector<FunctionProtoType::ExtParameterInfo, 4> extParamInfos(2);
459 argTys.push_back(Context.getCanonicalParamType(receiverType));
460 argTys.push_back(Context.getCanonicalParamType(Context.getObjCSelType()));
461 // FIXME: Kill copy?
462 for (const auto *I : MD->parameters()) {
463 argTys.push_back(Context.getCanonicalParamType(I->getType()));
464 auto extParamInfo = FunctionProtoType::ExtParameterInfo().withIsNoEscape(
465 I->hasAttr<NoEscapeAttr>());
466 extParamInfos.push_back(extParamInfo);
467 }
468
469 FunctionType::ExtInfo einfo;
470 bool IsWindows = getContext().getTargetInfo().getTriple().isOSWindows();
471 einfo = einfo.withCallingConv(getCallingConventionForDecl(MD, IsWindows));
472
473 if (getContext().getLangOpts().ObjCAutoRefCount &&
474 MD->hasAttr<NSReturnsRetainedAttr>())
475 einfo = einfo.withProducesResult(true);
476
477 RequiredArgs required =
478 (MD->isVariadic() ? RequiredArgs(argTys.size()) : RequiredArgs::All);
479
480 return arrangeLLVMFunctionInfo(
481 GetReturnType(MD->getReturnType()), /*instanceMethod=*/false,
482 /*chainCall=*/false, argTys, einfo, extParamInfos, required);
483}
484
485const CGFunctionInfo &
486CodeGenTypes::arrangeUnprototypedObjCMessageSend(QualType returnType,
487 const CallArgList &args) {
488 auto argTypes = getArgTypesForCall(Context, args);
489 FunctionType::ExtInfo einfo;
490
491 return arrangeLLVMFunctionInfo(
492 GetReturnType(returnType), /*instanceMethod=*/false,
493 /*chainCall=*/false, argTypes, einfo, {}, RequiredArgs::All);
494}
495
496const CGFunctionInfo &
497CodeGenTypes::arrangeGlobalDeclaration(GlobalDecl GD) {
498 // FIXME: Do we need to handle ObjCMethodDecl?
499 const FunctionDecl *FD = cast<FunctionDecl>(GD.getDecl());
500
501 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(FD))
502 return arrangeCXXStructorDeclaration(CD, getFromCtorType(GD.getCtorType()));
503
504 if (const CXXDestructorDecl *DD = dyn_cast<CXXDestructorDecl>(FD))
505 return arrangeCXXStructorDeclaration(DD, getFromDtorType(GD.getDtorType()));
506
507 return arrangeFunctionDeclaration(FD);
508}
509
510/// Arrange a thunk that takes 'this' as the first parameter followed by
511/// varargs. Return a void pointer, regardless of the actual return type.
512/// The body of the thunk will end in a musttail call to a function of the
513/// correct type, and the caller will bitcast the function to the correct
514/// prototype.
515const CGFunctionInfo &
516CodeGenTypes::arrangeUnprototypedMustTailThunk(const CXXMethodDecl *MD) {
517 assert(MD->isVirtual() && "only methods have thunks")(static_cast <bool> (MD->isVirtual() && "only methods have thunks"
) ? void (0) : __assert_fail ("MD->isVirtual() && \"only methods have thunks\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 517, __extension__ __PRETTY_FUNCTION__))
;
518 CanQual<FunctionProtoType> FTP = GetFormalType(MD);
519 CanQualType ArgTys[] = { GetThisType(Context, MD->getParent()) };
520 return arrangeLLVMFunctionInfo(Context.VoidTy, /*instanceMethod=*/false,
521 /*chainCall=*/false, ArgTys,
522 FTP->getExtInfo(), {}, RequiredArgs(1));
523}
524
525const CGFunctionInfo &
526CodeGenTypes::arrangeMSCtorClosure(const CXXConstructorDecl *CD,
527 CXXCtorType CT) {
528 assert(CT == Ctor_CopyingClosure || CT == Ctor_DefaultClosure)(static_cast <bool> (CT == Ctor_CopyingClosure || CT ==
Ctor_DefaultClosure) ? void (0) : __assert_fail ("CT == Ctor_CopyingClosure || CT == Ctor_DefaultClosure"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 528, __extension__ __PRETTY_FUNCTION__))
;
529
530 CanQual<FunctionProtoType> FTP = GetFormalType(CD);
531 SmallVector<CanQualType, 2> ArgTys;
532 const CXXRecordDecl *RD = CD->getParent();
533 ArgTys.push_back(GetThisType(Context, RD));
534 if (CT == Ctor_CopyingClosure)
535 ArgTys.push_back(*FTP->param_type_begin());
536 if (RD->getNumVBases() > 0)
537 ArgTys.push_back(Context.IntTy);
538 CallingConv CC = Context.getDefaultCallingConvention(
539 /*IsVariadic=*/false, /*IsCXXMethod=*/true);
540 return arrangeLLVMFunctionInfo(Context.VoidTy, /*instanceMethod=*/true,
541 /*chainCall=*/false, ArgTys,
542 FunctionType::ExtInfo(CC), {},
543 RequiredArgs::All);
544}
545
546/// Arrange a call as unto a free function, except possibly with an
547/// additional number of formal parameters considered required.
548static const CGFunctionInfo &
549arrangeFreeFunctionLikeCall(CodeGenTypes &CGT,
550 CodeGenModule &CGM,
551 const CallArgList &args,
552 const FunctionType *fnType,
553 unsigned numExtraRequiredArgs,
554 bool chainCall) {
555 assert(args.size() >= numExtraRequiredArgs)(static_cast <bool> (args.size() >= numExtraRequiredArgs
) ? void (0) : __assert_fail ("args.size() >= numExtraRequiredArgs"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 555, __extension__ __PRETTY_FUNCTION__))
;
556
557 llvm::SmallVector<FunctionProtoType::ExtParameterInfo, 16> paramInfos;
558
559 // In most cases, there are no optional arguments.
560 RequiredArgs required = RequiredArgs::All;
561
562 // If we have a variadic prototype, the required arguments are the
563 // extra prefix plus the arguments in the prototype.
564 if (const FunctionProtoType *proto = dyn_cast<FunctionProtoType>(fnType)) {
565 if (proto->isVariadic())
566 required = RequiredArgs(proto->getNumParams() + numExtraRequiredArgs);
567
568 if (proto->hasExtParameterInfos())
569 addExtParameterInfosForCall(paramInfos, proto, numExtraRequiredArgs,
570 args.size());
571
572 // If we don't have a prototype at all, but we're supposed to
573 // explicitly use the variadic convention for unprototyped calls,
574 // treat all of the arguments as required but preserve the nominal
575 // possibility of variadics.
576 } else if (CGM.getTargetCodeGenInfo()
577 .isNoProtoCallVariadic(args,
578 cast<FunctionNoProtoType>(fnType))) {
579 required = RequiredArgs(args.size());
580 }
581
582 // FIXME: Kill copy.
583 SmallVector<CanQualType, 16> argTypes;
584 for (const auto &arg : args)
585 argTypes.push_back(CGT.getContext().getCanonicalParamType(arg.Ty));
586 return CGT.arrangeLLVMFunctionInfo(GetReturnType(fnType->getReturnType()),
587 /*instanceMethod=*/false, chainCall,
588 argTypes, fnType->getExtInfo(), paramInfos,
589 required);
590}
591
592/// Figure out the rules for calling a function with the given formal
593/// type using the given arguments. The arguments are necessary
594/// because the function might be unprototyped, in which case it's
595/// target-dependent in crazy ways.
596const CGFunctionInfo &
597CodeGenTypes::arrangeFreeFunctionCall(const CallArgList &args,
598 const FunctionType *fnType,
599 bool chainCall) {
600 return arrangeFreeFunctionLikeCall(*this, CGM, args, fnType,
601 chainCall ? 1 : 0, chainCall);
602}
603
604/// A block function is essentially a free function with an
605/// extra implicit argument.
606const CGFunctionInfo &
607CodeGenTypes::arrangeBlockFunctionCall(const CallArgList &args,
608 const FunctionType *fnType) {
609 return arrangeFreeFunctionLikeCall(*this, CGM, args, fnType, 1,
610 /*chainCall=*/false);
611}
612
613const CGFunctionInfo &
614CodeGenTypes::arrangeBlockFunctionDeclaration(const FunctionProtoType *proto,
615 const FunctionArgList &params) {
616 auto paramInfos = getExtParameterInfosForCall(proto, 1, params.size());
617 auto argTypes = getArgTypesForDeclaration(Context, params);
618
619 return arrangeLLVMFunctionInfo(
620 GetReturnType(proto->getReturnType()),
621 /*instanceMethod*/ false, /*chainCall*/ false, argTypes,
622 proto->getExtInfo(), paramInfos,
623 RequiredArgs::forPrototypePlus(proto, 1, nullptr));
624}
625
626const CGFunctionInfo &
627CodeGenTypes::arrangeBuiltinFunctionCall(QualType resultType,
628 const CallArgList &args) {
629 // FIXME: Kill copy.
630 SmallVector<CanQualType, 16> argTypes;
631 for (const auto &Arg : args)
632 argTypes.push_back(Context.getCanonicalParamType(Arg.Ty));
633 return arrangeLLVMFunctionInfo(
634 GetReturnType(resultType), /*instanceMethod=*/false,
635 /*chainCall=*/false, argTypes, FunctionType::ExtInfo(),
636 /*paramInfos=*/ {}, RequiredArgs::All);
637}
638
639const CGFunctionInfo &
640CodeGenTypes::arrangeBuiltinFunctionDeclaration(QualType resultType,
641 const FunctionArgList &args) {
642 auto argTypes = getArgTypesForDeclaration(Context, args);
643
644 return arrangeLLVMFunctionInfo(
645 GetReturnType(resultType), /*instanceMethod=*/false, /*chainCall=*/false,
646 argTypes, FunctionType::ExtInfo(), {}, RequiredArgs::All);
647}
648
649const CGFunctionInfo &
650CodeGenTypes::arrangeBuiltinFunctionDeclaration(CanQualType resultType,
651 ArrayRef<CanQualType> argTypes) {
652 return arrangeLLVMFunctionInfo(
653 resultType, /*instanceMethod=*/false, /*chainCall=*/false,
654 argTypes, FunctionType::ExtInfo(), {}, RequiredArgs::All);
655}
656
657/// Arrange a call to a C++ method, passing the given arguments.
658///
659/// numPrefixArgs is the number of ABI-specific prefix arguments we have. It
660/// does not count `this`.
661const CGFunctionInfo &
662CodeGenTypes::arrangeCXXMethodCall(const CallArgList &args,
663 const FunctionProtoType *proto,
664 RequiredArgs required,
665 unsigned numPrefixArgs) {
666 assert(numPrefixArgs + 1 <= args.size() &&(static_cast <bool> (numPrefixArgs + 1 <= args.size(
) && "Emitting a call with less args than the required prefix?"
) ? void (0) : __assert_fail ("numPrefixArgs + 1 <= args.size() && \"Emitting a call with less args than the required prefix?\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 667, __extension__ __PRETTY_FUNCTION__))
667 "Emitting a call with less args than the required prefix?")(static_cast <bool> (numPrefixArgs + 1 <= args.size(
) && "Emitting a call with less args than the required prefix?"
) ? void (0) : __assert_fail ("numPrefixArgs + 1 <= args.size() && \"Emitting a call with less args than the required prefix?\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 667, __extension__ __PRETTY_FUNCTION__))
;
668 // Add one to account for `this`. It's a bit awkward here, but we don't count
669 // `this` in similar places elsewhere.
670 auto paramInfos =
671 getExtParameterInfosForCall(proto, numPrefixArgs + 1, args.size());
672
673 // FIXME: Kill copy.
674 auto argTypes = getArgTypesForCall(Context, args);
675
676 FunctionType::ExtInfo info = proto->getExtInfo();
677 return arrangeLLVMFunctionInfo(
678 GetReturnType(proto->getReturnType()), /*instanceMethod=*/true,
679 /*chainCall=*/false, argTypes, info, paramInfos, required);
680}
681
682const CGFunctionInfo &CodeGenTypes::arrangeNullaryFunction() {
683 return arrangeLLVMFunctionInfo(
684 getContext().VoidTy, /*instanceMethod=*/false, /*chainCall=*/false,
685 None, FunctionType::ExtInfo(), {}, RequiredArgs::All);
686}
687
688const CGFunctionInfo &
689CodeGenTypes::arrangeCall(const CGFunctionInfo &signature,
690 const CallArgList &args) {
691 assert(signature.arg_size() <= args.size())(static_cast <bool> (signature.arg_size() <= args.size
()) ? void (0) : __assert_fail ("signature.arg_size() <= args.size()"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 691, __extension__ __PRETTY_FUNCTION__))
;
692 if (signature.arg_size() == args.size())
693 return signature;
694
695 SmallVector<FunctionProtoType::ExtParameterInfo, 16> paramInfos;
696 auto sigParamInfos = signature.getExtParameterInfos();
697 if (!sigParamInfos.empty()) {
698 paramInfos.append(sigParamInfos.begin(), sigParamInfos.end());
699 paramInfos.resize(args.size());
700 }
701
702 auto argTypes = getArgTypesForCall(Context, args);
703
704 assert(signature.getRequiredArgs().allowsOptionalArgs())(static_cast <bool> (signature.getRequiredArgs().allowsOptionalArgs
()) ? void (0) : __assert_fail ("signature.getRequiredArgs().allowsOptionalArgs()"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 704, __extension__ __PRETTY_FUNCTION__))
;
705 return arrangeLLVMFunctionInfo(signature.getReturnType(),
706 signature.isInstanceMethod(),
707 signature.isChainCall(),
708 argTypes,
709 signature.getExtInfo(),
710 paramInfos,
711 signature.getRequiredArgs());
712}
713
714namespace clang {
715namespace CodeGen {
716void computeSPIRKernelABIInfo(CodeGenModule &CGM, CGFunctionInfo &FI);
717}
718}
719
720/// Arrange the argument and result information for an abstract value
721/// of a given function type. This is the method which all of the
722/// above functions ultimately defer to.
723const CGFunctionInfo &
724CodeGenTypes::arrangeLLVMFunctionInfo(CanQualType resultType,
725 bool instanceMethod,
726 bool chainCall,
727 ArrayRef<CanQualType> argTypes,
728 FunctionType::ExtInfo info,
729 ArrayRef<FunctionProtoType::ExtParameterInfo> paramInfos,
730 RequiredArgs required) {
731 assert(std::all_of(argTypes.begin(), argTypes.end(),(static_cast <bool> (std::all_of(argTypes.begin(), argTypes
.end(), [](CanQualType T) { return T.isCanonicalAsParam(); })
) ? void (0) : __assert_fail ("std::all_of(argTypes.begin(), argTypes.end(), [](CanQualType T) { return T.isCanonicalAsParam(); })"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 732, __extension__ __PRETTY_FUNCTION__))
732 [](CanQualType T) { return T.isCanonicalAsParam(); }))(static_cast <bool> (std::all_of(argTypes.begin(), argTypes
.end(), [](CanQualType T) { return T.isCanonicalAsParam(); })
) ? void (0) : __assert_fail ("std::all_of(argTypes.begin(), argTypes.end(), [](CanQualType T) { return T.isCanonicalAsParam(); })"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 732, __extension__ __PRETTY_FUNCTION__))
;
733
734 // Lookup or create unique function info.
735 llvm::FoldingSetNodeID ID;
736 CGFunctionInfo::Profile(ID, instanceMethod, chainCall, info, paramInfos,
737 required, resultType, argTypes);
738
739 void *insertPos = nullptr;
740 CGFunctionInfo *FI = FunctionInfos.FindNodeOrInsertPos(ID, insertPos);
741 if (FI)
742 return *FI;
743
744 unsigned CC = ClangCallConvToLLVMCallConv(info.getCC());
745
746 // Construct the function info. We co-allocate the ArgInfos.
747 FI = CGFunctionInfo::create(CC, instanceMethod, chainCall, info,
748 paramInfos, resultType, argTypes, required);
749 FunctionInfos.InsertNode(FI, insertPos);
750
751 bool inserted = FunctionsBeingProcessed.insert(FI).second;
752 (void)inserted;
753 assert(inserted && "Recursively being processed?")(static_cast <bool> (inserted && "Recursively being processed?"
) ? void (0) : __assert_fail ("inserted && \"Recursively being processed?\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 753, __extension__ __PRETTY_FUNCTION__))
;
754
755 // Compute ABI information.
756 if (CC == llvm::CallingConv::SPIR_KERNEL) {
757 // Force target independent argument handling for the host visible
758 // kernel functions.
759 computeSPIRKernelABIInfo(CGM, *FI);
760 } else if (info.getCC() == CC_Swift) {
761 swiftcall::computeABIInfo(CGM, *FI);
762 } else {
763 getABIInfo().computeInfo(*FI);
764 }
765
766 // Loop over all of the computed argument and return value info. If any of
767 // them are direct or extend without a specified coerce type, specify the
768 // default now.
769 ABIArgInfo &retInfo = FI->getReturnInfo();
770 if (retInfo.canHaveCoerceToType() && retInfo.getCoerceToType() == nullptr)
771 retInfo.setCoerceToType(ConvertType(FI->getReturnType()));
772
773 for (auto &I : FI->arguments())
774 if (I.info.canHaveCoerceToType() && I.info.getCoerceToType() == nullptr)
775 I.info.setCoerceToType(ConvertType(I.type));
776
777 bool erased = FunctionsBeingProcessed.erase(FI); (void)erased;
778 assert(erased && "Not in set?")(static_cast <bool> (erased && "Not in set?") ?
void (0) : __assert_fail ("erased && \"Not in set?\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 778, __extension__ __PRETTY_FUNCTION__))
;
779
780 return *FI;
781}
782
783CGFunctionInfo *CGFunctionInfo::create(unsigned llvmCC,
784 bool instanceMethod,
785 bool chainCall,
786 const FunctionType::ExtInfo &info,
787 ArrayRef<ExtParameterInfo> paramInfos,
788 CanQualType resultType,
789 ArrayRef<CanQualType> argTypes,
790 RequiredArgs required) {
791 assert(paramInfos.empty() || paramInfos.size() == argTypes.size())(static_cast <bool> (paramInfos.empty() || paramInfos.size
() == argTypes.size()) ? void (0) : __assert_fail ("paramInfos.empty() || paramInfos.size() == argTypes.size()"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 791, __extension__ __PRETTY_FUNCTION__))
;
792
793 void *buffer =
794 operator new(totalSizeToAlloc<ArgInfo, ExtParameterInfo>(
795 argTypes.size() + 1, paramInfos.size()));
796
797 CGFunctionInfo *FI = new(buffer) CGFunctionInfo();
798 FI->CallingConvention = llvmCC;
799 FI->EffectiveCallingConvention = llvmCC;
800 FI->ASTCallingConvention = info.getCC();
801 FI->InstanceMethod = instanceMethod;
802 FI->ChainCall = chainCall;
803 FI->NoReturn = info.getNoReturn();
804 FI->ReturnsRetained = info.getProducesResult();
805 FI->NoCallerSavedRegs = info.getNoCallerSavedRegs();
806 FI->NoCfCheck = info.getNoCfCheck();
807 FI->Required = required;
808 FI->HasRegParm = info.getHasRegParm();
809 FI->RegParm = info.getRegParm();
810 FI->ArgStruct = nullptr;
811 FI->ArgStructAlign = 0;
812 FI->NumArgs = argTypes.size();
813 FI->HasExtParameterInfos = !paramInfos.empty();
814 FI->getArgsBuffer()[0].type = resultType;
815 for (unsigned i = 0, e = argTypes.size(); i != e; ++i)
816 FI->getArgsBuffer()[i + 1].type = argTypes[i];
817 for (unsigned i = 0, e = paramInfos.size(); i != e; ++i)
818 FI->getExtParameterInfosBuffer()[i] = paramInfos[i];
819 return FI;
820}
821
822/***/
823
824namespace {
825// ABIArgInfo::Expand implementation.
826
827// Specifies the way QualType passed as ABIArgInfo::Expand is expanded.
828struct TypeExpansion {
829 enum TypeExpansionKind {
830 // Elements of constant arrays are expanded recursively.
831 TEK_ConstantArray,
832 // Record fields are expanded recursively (but if record is a union, only
833 // the field with the largest size is expanded).
834 TEK_Record,
835 // For complex types, real and imaginary parts are expanded recursively.
836 TEK_Complex,
837 // All other types are not expandable.
838 TEK_None
839 };
840
841 const TypeExpansionKind Kind;
842
843 TypeExpansion(TypeExpansionKind K) : Kind(K) {}
844 virtual ~TypeExpansion() {}
845};
846
847struct ConstantArrayExpansion : TypeExpansion {
848 QualType EltTy;
849 uint64_t NumElts;
850
851 ConstantArrayExpansion(QualType EltTy, uint64_t NumElts)
852 : TypeExpansion(TEK_ConstantArray), EltTy(EltTy), NumElts(NumElts) {}
853 static bool classof(const TypeExpansion *TE) {
854 return TE->Kind == TEK_ConstantArray;
855 }
856};
857
858struct RecordExpansion : TypeExpansion {
859 SmallVector<const CXXBaseSpecifier *, 1> Bases;
860
861 SmallVector<const FieldDecl *, 1> Fields;
862
863 RecordExpansion(SmallVector<const CXXBaseSpecifier *, 1> &&Bases,
864 SmallVector<const FieldDecl *, 1> &&Fields)
865 : TypeExpansion(TEK_Record), Bases(std::move(Bases)),
866 Fields(std::move(Fields)) {}
867 static bool classof(const TypeExpansion *TE) {
868 return TE->Kind == TEK_Record;
869 }
870};
871
872struct ComplexExpansion : TypeExpansion {
873 QualType EltTy;
874
875 ComplexExpansion(QualType EltTy) : TypeExpansion(TEK_Complex), EltTy(EltTy) {}
876 static bool classof(const TypeExpansion *TE) {
877 return TE->Kind == TEK_Complex;
878 }
879};
880
881struct NoExpansion : TypeExpansion {
882 NoExpansion() : TypeExpansion(TEK_None) {}
883 static bool classof(const TypeExpansion *TE) {
884 return TE->Kind == TEK_None;
885 }
886};
887} // namespace
888
889static std::unique_ptr<TypeExpansion>
890getTypeExpansion(QualType Ty, const ASTContext &Context) {
891 if (const ConstantArrayType *AT = Context.getAsConstantArrayType(Ty)) {
892 return llvm::make_unique<ConstantArrayExpansion>(
893 AT->getElementType(), AT->getSize().getZExtValue());
894 }
895 if (const RecordType *RT = Ty->getAs<RecordType>()) {
896 SmallVector<const CXXBaseSpecifier *, 1> Bases;
897 SmallVector<const FieldDecl *, 1> Fields;
898 const RecordDecl *RD = RT->getDecl();
899 assert(!RD->hasFlexibleArrayMember() &&(static_cast <bool> (!RD->hasFlexibleArrayMember() &&
"Cannot expand structure with flexible array.") ? void (0) :
__assert_fail ("!RD->hasFlexibleArrayMember() && \"Cannot expand structure with flexible array.\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 900, __extension__ __PRETTY_FUNCTION__))
900 "Cannot expand structure with flexible array.")(static_cast <bool> (!RD->hasFlexibleArrayMember() &&
"Cannot expand structure with flexible array.") ? void (0) :
__assert_fail ("!RD->hasFlexibleArrayMember() && \"Cannot expand structure with flexible array.\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 900, __extension__ __PRETTY_FUNCTION__))
;
901 if (RD->isUnion()) {
902 // Unions can be here only in degenerative cases - all the fields are same
903 // after flattening. Thus we have to use the "largest" field.
904 const FieldDecl *LargestFD = nullptr;
905 CharUnits UnionSize = CharUnits::Zero();
906
907 for (const auto *FD : RD->fields()) {
908 if (FD->isZeroLengthBitField(Context))
909 continue;
910 assert(!FD->isBitField() &&(static_cast <bool> (!FD->isBitField() && "Cannot expand structure with bit-field members."
) ? void (0) : __assert_fail ("!FD->isBitField() && \"Cannot expand structure with bit-field members.\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 911, __extension__ __PRETTY_FUNCTION__))
911 "Cannot expand structure with bit-field members.")(static_cast <bool> (!FD->isBitField() && "Cannot expand structure with bit-field members."
) ? void (0) : __assert_fail ("!FD->isBitField() && \"Cannot expand structure with bit-field members.\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 911, __extension__ __PRETTY_FUNCTION__))
;
912 CharUnits FieldSize = Context.getTypeSizeInChars(FD->getType());
913 if (UnionSize < FieldSize) {
914 UnionSize = FieldSize;
915 LargestFD = FD;
916 }
917 }
918 if (LargestFD)
919 Fields.push_back(LargestFD);
920 } else {
921 if (const auto *CXXRD = dyn_cast<CXXRecordDecl>(RD)) {
922 assert(!CXXRD->isDynamicClass() &&(static_cast <bool> (!CXXRD->isDynamicClass() &&
"cannot expand vtable pointers in dynamic classes") ? void (
0) : __assert_fail ("!CXXRD->isDynamicClass() && \"cannot expand vtable pointers in dynamic classes\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 923, __extension__ __PRETTY_FUNCTION__))
923 "cannot expand vtable pointers in dynamic classes")(static_cast <bool> (!CXXRD->isDynamicClass() &&
"cannot expand vtable pointers in dynamic classes") ? void (
0) : __assert_fail ("!CXXRD->isDynamicClass() && \"cannot expand vtable pointers in dynamic classes\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 923, __extension__ __PRETTY_FUNCTION__))
;
924 for (const CXXBaseSpecifier &BS : CXXRD->bases())
925 Bases.push_back(&BS);
926 }
927
928 for (const auto *FD : RD->fields()) {
929 if (FD->isZeroLengthBitField(Context))
930 continue;
931 assert(!FD->isBitField() &&(static_cast <bool> (!FD->isBitField() && "Cannot expand structure with bit-field members."
) ? void (0) : __assert_fail ("!FD->isBitField() && \"Cannot expand structure with bit-field members.\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 932, __extension__ __PRETTY_FUNCTION__))
932 "Cannot expand structure with bit-field members.")(static_cast <bool> (!FD->isBitField() && "Cannot expand structure with bit-field members."
) ? void (0) : __assert_fail ("!FD->isBitField() && \"Cannot expand structure with bit-field members.\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 932, __extension__ __PRETTY_FUNCTION__))
;
933 Fields.push_back(FD);
934 }
935 }
936 return llvm::make_unique<RecordExpansion>(std::move(Bases),
937 std::move(Fields));
938 }
939 if (const ComplexType *CT = Ty->getAs<ComplexType>()) {
940 return llvm::make_unique<ComplexExpansion>(CT->getElementType());
941 }
942 return llvm::make_unique<NoExpansion>();
943}
944
945static int getExpansionSize(QualType Ty, const ASTContext &Context) {
946 auto Exp = getTypeExpansion(Ty, Context);
947 if (auto CAExp = dyn_cast<ConstantArrayExpansion>(Exp.get())) {
948 return CAExp->NumElts * getExpansionSize(CAExp->EltTy, Context);
949 }
950 if (auto RExp = dyn_cast<RecordExpansion>(Exp.get())) {
951 int Res = 0;
952 for (auto BS : RExp->Bases)
953 Res += getExpansionSize(BS->getType(), Context);
954 for (auto FD : RExp->Fields)
955 Res += getExpansionSize(FD->getType(), Context);
956 return Res;
957 }
958 if (isa<ComplexExpansion>(Exp.get()))
959 return 2;
960 assert(isa<NoExpansion>(Exp.get()))(static_cast <bool> (isa<NoExpansion>(Exp.get()))
? void (0) : __assert_fail ("isa<NoExpansion>(Exp.get())"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 960, __extension__ __PRETTY_FUNCTION__))
;
961 return 1;
962}
963
964void
965CodeGenTypes::getExpandedTypes(QualType Ty,
966 SmallVectorImpl<llvm::Type *>::iterator &TI) {
967 auto Exp = getTypeExpansion(Ty, Context);
968 if (auto CAExp = dyn_cast<ConstantArrayExpansion>(Exp.get())) {
969 for (int i = 0, n = CAExp->NumElts; i < n; i++) {
970 getExpandedTypes(CAExp->EltTy, TI);
971 }
972 } else if (auto RExp = dyn_cast<RecordExpansion>(Exp.get())) {
973 for (auto BS : RExp->Bases)
974 getExpandedTypes(BS->getType(), TI);
975 for (auto FD : RExp->Fields)
976 getExpandedTypes(FD->getType(), TI);
977 } else if (auto CExp = dyn_cast<ComplexExpansion>(Exp.get())) {
978 llvm::Type *EltTy = ConvertType(CExp->EltTy);
979 *TI++ = EltTy;
980 *TI++ = EltTy;
981 } else {
982 assert(isa<NoExpansion>(Exp.get()))(static_cast <bool> (isa<NoExpansion>(Exp.get()))
? void (0) : __assert_fail ("isa<NoExpansion>(Exp.get())"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 982, __extension__ __PRETTY_FUNCTION__))
;
983 *TI++ = ConvertType(Ty);
984 }
985}
986
987static void forConstantArrayExpansion(CodeGenFunction &CGF,
988 ConstantArrayExpansion *CAE,
989 Address BaseAddr,
990 llvm::function_ref<void(Address)> Fn) {
991 CharUnits EltSize = CGF.getContext().getTypeSizeInChars(CAE->EltTy);
992 CharUnits EltAlign =
993 BaseAddr.getAlignment().alignmentOfArrayElement(EltSize);
994
995 for (int i = 0, n = CAE->NumElts; i < n; i++) {
996 llvm::Value *EltAddr =
997 CGF.Builder.CreateConstGEP2_32(nullptr, BaseAddr.getPointer(), 0, i);
998 Fn(Address(EltAddr, EltAlign));
999 }
1000}
1001
1002void CodeGenFunction::ExpandTypeFromArgs(
1003 QualType Ty, LValue LV, SmallVectorImpl<llvm::Value *>::iterator &AI) {
1004 assert(LV.isSimple() &&(static_cast <bool> (LV.isSimple() && "Unexpected non-simple lvalue during struct expansion."
) ? void (0) : __assert_fail ("LV.isSimple() && \"Unexpected non-simple lvalue during struct expansion.\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 1005, __extension__ __PRETTY_FUNCTION__))
1005 "Unexpected non-simple lvalue during struct expansion.")(static_cast <bool> (LV.isSimple() && "Unexpected non-simple lvalue during struct expansion."
) ? void (0) : __assert_fail ("LV.isSimple() && \"Unexpected non-simple lvalue during struct expansion.\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 1005, __extension__ __PRETTY_FUNCTION__))
;
1006
1007 auto Exp = getTypeExpansion(Ty, getContext());
1008 if (auto CAExp = dyn_cast<ConstantArrayExpansion>(Exp.get())) {
1009 forConstantArrayExpansion(*this, CAExp, LV.getAddress(),
1010 [&](Address EltAddr) {
1011 LValue LV = MakeAddrLValue(EltAddr, CAExp->EltTy);
1012 ExpandTypeFromArgs(CAExp->EltTy, LV, AI);
1013 });
1014 } else if (auto RExp = dyn_cast<RecordExpansion>(Exp.get())) {
1015 Address This = LV.getAddress();
1016 for (const CXXBaseSpecifier *BS : RExp->Bases) {
1017 // Perform a single step derived-to-base conversion.
1018 Address Base =
1019 GetAddressOfBaseClass(This, Ty->getAsCXXRecordDecl(), &BS, &BS + 1,
1020 /*NullCheckValue=*/false, SourceLocation());
1021 LValue SubLV = MakeAddrLValue(Base, BS->getType());
1022
1023 // Recurse onto bases.
1024 ExpandTypeFromArgs(BS->getType(), SubLV, AI);
1025 }
1026 for (auto FD : RExp->Fields) {
1027 // FIXME: What are the right qualifiers here?
1028 LValue SubLV = EmitLValueForFieldInitialization(LV, FD);
1029 ExpandTypeFromArgs(FD->getType(), SubLV, AI);
1030 }
1031 } else if (isa<ComplexExpansion>(Exp.get())) {
1032 auto realValue = *AI++;
1033 auto imagValue = *AI++;
1034 EmitStoreOfComplex(ComplexPairTy(realValue, imagValue), LV, /*init*/ true);
1035 } else {
1036 assert(isa<NoExpansion>(Exp.get()))(static_cast <bool> (isa<NoExpansion>(Exp.get()))
? void (0) : __assert_fail ("isa<NoExpansion>(Exp.get())"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 1036, __extension__ __PRETTY_FUNCTION__))
;
1037 EmitStoreThroughLValue(RValue::get(*AI++), LV);
1038 }
1039}
1040
1041void CodeGenFunction::ExpandTypeToArgs(
1042 QualType Ty, CallArg Arg, llvm::FunctionType *IRFuncTy,
1043 SmallVectorImpl<llvm::Value *> &IRCallArgs, unsigned &IRCallArgPos) {
1044 auto Exp = getTypeExpansion(Ty, getContext());
1045 if (auto CAExp = dyn_cast<ConstantArrayExpansion>(Exp.get())) {
1046 Address Addr = Arg.hasLValue() ? Arg.getKnownLValue().getAddress()
1047 : Arg.getKnownRValue().getAggregateAddress();
1048 forConstantArrayExpansion(
1049 *this, CAExp, Addr, [&](Address EltAddr) {
1050 CallArg EltArg = CallArg(
1051 convertTempToRValue(EltAddr, CAExp->EltTy, SourceLocation()),
1052 CAExp->EltTy);
1053 ExpandTypeToArgs(CAExp->EltTy, EltArg, IRFuncTy, IRCallArgs,
1054 IRCallArgPos);
1055 });
1056 } else if (auto RExp = dyn_cast<RecordExpansion>(Exp.get())) {
1057 Address This = Arg.hasLValue() ? Arg.getKnownLValue().getAddress()
1058 : Arg.getKnownRValue().getAggregateAddress();
1059 for (const CXXBaseSpecifier *BS : RExp->Bases) {
1060 // Perform a single step derived-to-base conversion.
1061 Address Base =
1062 GetAddressOfBaseClass(This, Ty->getAsCXXRecordDecl(), &BS, &BS + 1,
1063 /*NullCheckValue=*/false, SourceLocation());
1064 CallArg BaseArg = CallArg(RValue::getAggregate(Base), BS->getType());
1065
1066 // Recurse onto bases.
1067 ExpandTypeToArgs(BS->getType(), BaseArg, IRFuncTy, IRCallArgs,
1068 IRCallArgPos);
1069 }
1070
1071 LValue LV = MakeAddrLValue(This, Ty);
1072 for (auto FD : RExp->Fields) {
1073 CallArg FldArg =
1074 CallArg(EmitRValueForField(LV, FD, SourceLocation()), FD->getType());
1075 ExpandTypeToArgs(FD->getType(), FldArg, IRFuncTy, IRCallArgs,
1076 IRCallArgPos);
1077 }
1078 } else if (isa<ComplexExpansion>(Exp.get())) {
1079 ComplexPairTy CV = Arg.getKnownRValue().getComplexVal();
1080 IRCallArgs[IRCallArgPos++] = CV.first;
1081 IRCallArgs[IRCallArgPos++] = CV.second;
1082 } else {
1083 assert(isa<NoExpansion>(Exp.get()))(static_cast <bool> (isa<NoExpansion>(Exp.get()))
? void (0) : __assert_fail ("isa<NoExpansion>(Exp.get())"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 1083, __extension__ __PRETTY_FUNCTION__))
;
1084 auto RV = Arg.getKnownRValue();
1085 assert(RV.isScalar() &&(static_cast <bool> (RV.isScalar() && "Unexpected non-scalar rvalue during struct expansion."
) ? void (0) : __assert_fail ("RV.isScalar() && \"Unexpected non-scalar rvalue during struct expansion.\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 1086, __extension__ __PRETTY_FUNCTION__))
1086 "Unexpected non-scalar rvalue during struct expansion.")(static_cast <bool> (RV.isScalar() && "Unexpected non-scalar rvalue during struct expansion."
) ? void (0) : __assert_fail ("RV.isScalar() && \"Unexpected non-scalar rvalue during struct expansion.\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 1086, __extension__ __PRETTY_FUNCTION__))
;
1087
1088 // Insert a bitcast as needed.
1089 llvm::Value *V = RV.getScalarVal();
1090 if (IRCallArgPos < IRFuncTy->getNumParams() &&
1091 V->getType() != IRFuncTy->getParamType(IRCallArgPos))
1092 V = Builder.CreateBitCast(V, IRFuncTy->getParamType(IRCallArgPos));
1093
1094 IRCallArgs[IRCallArgPos++] = V;
1095 }
1096}
1097
1098/// Create a temporary allocation for the purposes of coercion.
1099static Address CreateTempAllocaForCoercion(CodeGenFunction &CGF, llvm::Type *Ty,
1100 CharUnits MinAlign) {
1101 // Don't use an alignment that's worse than what LLVM would prefer.
1102 auto PrefAlign = CGF.CGM.getDataLayout().getPrefTypeAlignment(Ty);
1103 CharUnits Align = std::max(MinAlign, CharUnits::fromQuantity(PrefAlign));
1104
1105 return CGF.CreateTempAlloca(Ty, Align);
1106}
1107
1108/// EnterStructPointerForCoercedAccess - Given a struct pointer that we are
1109/// accessing some number of bytes out of it, try to gep into the struct to get
1110/// at its inner goodness. Dive as deep as possible without entering an element
1111/// with an in-memory size smaller than DstSize.
1112static Address
1113EnterStructPointerForCoercedAccess(Address SrcPtr,
1114 llvm::StructType *SrcSTy,
1115 uint64_t DstSize, CodeGenFunction &CGF) {
1116 // We can't dive into a zero-element struct.
1117 if (SrcSTy->getNumElements() == 0) return SrcPtr;
1118
1119 llvm::Type *FirstElt = SrcSTy->getElementType(0);
1120
1121 // If the first elt is at least as large as what we're looking for, or if the
1122 // first element is the same size as the whole struct, we can enter it. The
1123 // comparison must be made on the store size and not the alloca size. Using
1124 // the alloca size may overstate the size of the load.
1125 uint64_t FirstEltSize =
1126 CGF.CGM.getDataLayout().getTypeStoreSize(FirstElt);
1127 if (FirstEltSize < DstSize &&
1128 FirstEltSize < CGF.CGM.getDataLayout().getTypeStoreSize(SrcSTy))
1129 return SrcPtr;
1130
1131 // GEP into the first element.
1132 SrcPtr = CGF.Builder.CreateStructGEP(SrcPtr, 0, CharUnits(), "coerce.dive");
1133
1134 // If the first element is a struct, recurse.
1135 llvm::Type *SrcTy = SrcPtr.getElementType();
1136 if (llvm::StructType *SrcSTy = dyn_cast<llvm::StructType>(SrcTy))
1137 return EnterStructPointerForCoercedAccess(SrcPtr, SrcSTy, DstSize, CGF);
1138
1139 return SrcPtr;
1140}
1141
1142/// CoerceIntOrPtrToIntOrPtr - Convert a value Val to the specific Ty where both
1143/// are either integers or pointers. This does a truncation of the value if it
1144/// is too large or a zero extension if it is too small.
1145///
1146/// This behaves as if the value were coerced through memory, so on big-endian
1147/// targets the high bits are preserved in a truncation, while little-endian
1148/// targets preserve the low bits.
1149static llvm::Value *CoerceIntOrPtrToIntOrPtr(llvm::Value *Val,
1150 llvm::Type *Ty,
1151 CodeGenFunction &CGF) {
1152 if (Val->getType() == Ty)
1153 return Val;
1154
1155 if (isa<llvm::PointerType>(Val->getType())) {
1156 // If this is Pointer->Pointer avoid conversion to and from int.
1157 if (isa<llvm::PointerType>(Ty))
1158 return CGF.Builder.CreateBitCast(Val, Ty, "coerce.val");
1159
1160 // Convert the pointer to an integer so we can play with its width.
1161 Val = CGF.Builder.CreatePtrToInt(Val, CGF.IntPtrTy, "coerce.val.pi");
1162 }
1163
1164 llvm::Type *DestIntTy = Ty;
1165 if (isa<llvm::PointerType>(DestIntTy))
1166 DestIntTy = CGF.IntPtrTy;
1167
1168 if (Val->getType() != DestIntTy) {
1169 const llvm::DataLayout &DL = CGF.CGM.getDataLayout();
1170 if (DL.isBigEndian()) {
1171 // Preserve the high bits on big-endian targets.
1172 // That is what memory coercion does.
1173 uint64_t SrcSize = DL.getTypeSizeInBits(Val->getType());
1174 uint64_t DstSize = DL.getTypeSizeInBits(DestIntTy);
1175
1176 if (SrcSize > DstSize) {
1177 Val = CGF.Builder.CreateLShr(Val, SrcSize - DstSize, "coerce.highbits");
1178 Val = CGF.Builder.CreateTrunc(Val, DestIntTy, "coerce.val.ii");
1179 } else {
1180 Val = CGF.Builder.CreateZExt(Val, DestIntTy, "coerce.val.ii");
1181 Val = CGF.Builder.CreateShl(Val, DstSize - SrcSize, "coerce.highbits");
1182 }
1183 } else {
1184 // Little-endian targets preserve the low bits. No shifts required.
1185 Val = CGF.Builder.CreateIntCast(Val, DestIntTy, false, "coerce.val.ii");
1186 }
1187 }
1188
1189 if (isa<llvm::PointerType>(Ty))
1190 Val = CGF.Builder.CreateIntToPtr(Val, Ty, "coerce.val.ip");
1191 return Val;
1192}
1193
1194
1195
1196/// CreateCoercedLoad - Create a load from \arg SrcPtr interpreted as
1197/// a pointer to an object of type \arg Ty, known to be aligned to
1198/// \arg SrcAlign bytes.
1199///
1200/// This safely handles the case when the src type is smaller than the
1201/// destination type; in this situation the values of bits which not
1202/// present in the src are undefined.
1203static llvm::Value *CreateCoercedLoad(Address Src, llvm::Type *Ty,
1204 CodeGenFunction &CGF) {
1205 llvm::Type *SrcTy = Src.getElementType();
1206
1207 // If SrcTy and Ty are the same, just do a load.
1208 if (SrcTy == Ty)
1209 return CGF.Builder.CreateLoad(Src);
1210
1211 uint64_t DstSize = CGF.CGM.getDataLayout().getTypeAllocSize(Ty);
1212
1213 if (llvm::StructType *SrcSTy = dyn_cast<llvm::StructType>(SrcTy)) {
1214 Src = EnterStructPointerForCoercedAccess(Src, SrcSTy, DstSize, CGF);
1215 SrcTy = Src.getType()->getElementType();
1216 }
1217
1218 uint64_t SrcSize = CGF.CGM.getDataLayout().getTypeAllocSize(SrcTy);
1219
1220 // If the source and destination are integer or pointer types, just do an
1221 // extension or truncation to the desired type.
1222 if ((isa<llvm::IntegerType>(Ty) || isa<llvm::PointerType>(Ty)) &&
1223 (isa<llvm::IntegerType>(SrcTy) || isa<llvm::PointerType>(SrcTy))) {
1224 llvm::Value *Load = CGF.Builder.CreateLoad(Src);
1225 return CoerceIntOrPtrToIntOrPtr(Load, Ty, CGF);
1226 }
1227
1228 // If load is legal, just bitcast the src pointer.
1229 if (SrcSize >= DstSize) {
1230 // Generally SrcSize is never greater than DstSize, since this means we are
1231 // losing bits. However, this can happen in cases where the structure has
1232 // additional padding, for example due to a user specified alignment.
1233 //
1234 // FIXME: Assert that we aren't truncating non-padding bits when have access
1235 // to that information.
1236 Src = CGF.Builder.CreateBitCast(Src,
1237 Ty->getPointerTo(Src.getAddressSpace()));
1238 return CGF.Builder.CreateLoad(Src);
1239 }
1240
1241 // Otherwise do coercion through memory. This is stupid, but simple.
1242 Address Tmp = CreateTempAllocaForCoercion(CGF, Ty, Src.getAlignment());
1243 Address Casted = CGF.Builder.CreateBitCast(Tmp, CGF.AllocaInt8PtrTy);
1244 Address SrcCasted = CGF.Builder.CreateBitCast(Src, CGF.AllocaInt8PtrTy);
1245 CGF.Builder.CreateMemCpy(Casted, SrcCasted,
1246 llvm::ConstantInt::get(CGF.IntPtrTy, SrcSize),
1247 false);
1248 return CGF.Builder.CreateLoad(Tmp);
1249}
1250
1251// Function to store a first-class aggregate into memory. We prefer to
1252// store the elements rather than the aggregate to be more friendly to
1253// fast-isel.
1254// FIXME: Do we need to recurse here?
1255static void BuildAggStore(CodeGenFunction &CGF, llvm::Value *Val,
1256 Address Dest, bool DestIsVolatile) {
1257 // Prefer scalar stores to first-class aggregate stores.
1258 if (llvm::StructType *STy =
1259 dyn_cast<llvm::StructType>(Val->getType())) {
1260 const llvm::StructLayout *Layout =
1261 CGF.CGM.getDataLayout().getStructLayout(STy);
1262
1263 for (unsigned i = 0, e = STy->getNumElements(); i != e; ++i) {
1264 auto EltOffset = CharUnits::fromQuantity(Layout->getElementOffset(i));
1265 Address EltPtr = CGF.Builder.CreateStructGEP(Dest, i, EltOffset);
1266 llvm::Value *Elt = CGF.Builder.CreateExtractValue(Val, i);
1267 CGF.Builder.CreateStore(Elt, EltPtr, DestIsVolatile);
1268 }
1269 } else {
1270 CGF.Builder.CreateStore(Val, Dest, DestIsVolatile);
1271 }
1272}
1273
1274/// CreateCoercedStore - Create a store to \arg DstPtr from \arg Src,
1275/// where the source and destination may have different types. The
1276/// destination is known to be aligned to \arg DstAlign bytes.
1277///
1278/// This safely handles the case when the src type is larger than the
1279/// destination type; the upper bits of the src will be lost.
1280static void CreateCoercedStore(llvm::Value *Src,
1281 Address Dst,
1282 bool DstIsVolatile,
1283 CodeGenFunction &CGF) {
1284 llvm::Type *SrcTy = Src->getType();
1285 llvm::Type *DstTy = Dst.getType()->getElementType();
1286 if (SrcTy == DstTy) {
1287 CGF.Builder.CreateStore(Src, Dst, DstIsVolatile);
1288 return;
1289 }
1290
1291 uint64_t SrcSize = CGF.CGM.getDataLayout().getTypeAllocSize(SrcTy);
1292
1293 if (llvm::StructType *DstSTy = dyn_cast<llvm::StructType>(DstTy)) {
1294 Dst = EnterStructPointerForCoercedAccess(Dst, DstSTy, SrcSize, CGF);
1295 DstTy = Dst.getType()->getElementType();
1296 }
1297
1298 // If the source and destination are integer or pointer types, just do an
1299 // extension or truncation to the desired type.
1300 if ((isa<llvm::IntegerType>(SrcTy) || isa<llvm::PointerType>(SrcTy)) &&
1301 (isa<llvm::IntegerType>(DstTy) || isa<llvm::PointerType>(DstTy))) {
1302 Src = CoerceIntOrPtrToIntOrPtr(Src, DstTy, CGF);
1303 CGF.Builder.CreateStore(Src, Dst, DstIsVolatile);
1304 return;
1305 }
1306
1307 uint64_t DstSize = CGF.CGM.getDataLayout().getTypeAllocSize(DstTy);
1308
1309 // If store is legal, just bitcast the src pointer.
1310 if (SrcSize <= DstSize) {
1311 Dst = CGF.Builder.CreateElementBitCast(Dst, SrcTy);
1312 BuildAggStore(CGF, Src, Dst, DstIsVolatile);
1313 } else {
1314 // Otherwise do coercion through memory. This is stupid, but
1315 // simple.
1316
1317 // Generally SrcSize is never greater than DstSize, since this means we are
1318 // losing bits. However, this can happen in cases where the structure has
1319 // additional padding, for example due to a user specified alignment.
1320 //
1321 // FIXME: Assert that we aren't truncating non-padding bits when have access
1322 // to that information.
1323 Address Tmp = CreateTempAllocaForCoercion(CGF, SrcTy, Dst.getAlignment());
1324 CGF.Builder.CreateStore(Src, Tmp);
1325 Address Casted = CGF.Builder.CreateBitCast(Tmp, CGF.AllocaInt8PtrTy);
1326 Address DstCasted = CGF.Builder.CreateBitCast(Dst, CGF.AllocaInt8PtrTy);
1327 CGF.Builder.CreateMemCpy(DstCasted, Casted,
1328 llvm::ConstantInt::get(CGF.IntPtrTy, DstSize),
1329 false);
1330 }
1331}
1332
1333static Address emitAddressAtOffset(CodeGenFunction &CGF, Address addr,
1334 const ABIArgInfo &info) {
1335 if (unsigned offset = info.getDirectOffset()) {
1336 addr = CGF.Builder.CreateElementBitCast(addr, CGF.Int8Ty);
1337 addr = CGF.Builder.CreateConstInBoundsByteGEP(addr,
1338 CharUnits::fromQuantity(offset));
1339 addr = CGF.Builder.CreateElementBitCast(addr, info.getCoerceToType());
1340 }
1341 return addr;
1342}
1343
1344namespace {
1345
1346/// Encapsulates information about the way function arguments from
1347/// CGFunctionInfo should be passed to actual LLVM IR function.
1348class ClangToLLVMArgMapping {
1349 static const unsigned InvalidIndex = ~0U;
1350 unsigned InallocaArgNo;
1351 unsigned SRetArgNo;
1352 unsigned TotalIRArgs;
1353
1354 /// Arguments of LLVM IR function corresponding to single Clang argument.
1355 struct IRArgs {
1356 unsigned PaddingArgIndex;
1357 // Argument is expanded to IR arguments at positions
1358 // [FirstArgIndex, FirstArgIndex + NumberOfArgs).
1359 unsigned FirstArgIndex;
1360 unsigned NumberOfArgs;
1361
1362 IRArgs()
1363 : PaddingArgIndex(InvalidIndex), FirstArgIndex(InvalidIndex),
1364 NumberOfArgs(0) {}
1365 };
1366
1367 SmallVector<IRArgs, 8> ArgInfo;
1368
1369public:
1370 ClangToLLVMArgMapping(const ASTContext &Context, const CGFunctionInfo &FI,
1371 bool OnlyRequiredArgs = false)
1372 : InallocaArgNo(InvalidIndex), SRetArgNo(InvalidIndex), TotalIRArgs(0),
1373 ArgInfo(OnlyRequiredArgs ? FI.getNumRequiredArgs() : FI.arg_size()) {
1374 construct(Context, FI, OnlyRequiredArgs);
1375 }
1376
1377 bool hasInallocaArg() const { return InallocaArgNo != InvalidIndex; }
1378 unsigned getInallocaArgNo() const {
1379 assert(hasInallocaArg())(static_cast <bool> (hasInallocaArg()) ? void (0) : __assert_fail
("hasInallocaArg()", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 1379, __extension__ __PRETTY_FUNCTION__))
;
1380 return InallocaArgNo;
1381 }
1382
1383 bool hasSRetArg() const { return SRetArgNo != InvalidIndex; }
1384 unsigned getSRetArgNo() const {
1385 assert(hasSRetArg())(static_cast <bool> (hasSRetArg()) ? void (0) : __assert_fail
("hasSRetArg()", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 1385, __extension__ __PRETTY_FUNCTION__))
;
1386 return SRetArgNo;
1387 }
1388
1389 unsigned totalIRArgs() const { return TotalIRArgs; }
1390
1391 bool hasPaddingArg(unsigned ArgNo) const {
1392 assert(ArgNo < ArgInfo.size())(static_cast <bool> (ArgNo < ArgInfo.size()) ? void (
0) : __assert_fail ("ArgNo < ArgInfo.size()", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 1392, __extension__ __PRETTY_FUNCTION__))
;
1393 return ArgInfo[ArgNo].PaddingArgIndex != InvalidIndex;
1394 }
1395 unsigned getPaddingArgNo(unsigned ArgNo) const {
1396 assert(hasPaddingArg(ArgNo))(static_cast <bool> (hasPaddingArg(ArgNo)) ? void (0) :
__assert_fail ("hasPaddingArg(ArgNo)", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 1396, __extension__ __PRETTY_FUNCTION__))
;
1397 return ArgInfo[ArgNo].PaddingArgIndex;
1398 }
1399
1400 /// Returns index of first IR argument corresponding to ArgNo, and their
1401 /// quantity.
1402 std::pair<unsigned, unsigned> getIRArgs(unsigned ArgNo) const {
1403 assert(ArgNo < ArgInfo.size())(static_cast <bool> (ArgNo < ArgInfo.size()) ? void (
0) : __assert_fail ("ArgNo < ArgInfo.size()", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 1403, __extension__ __PRETTY_FUNCTION__))
;
1404 return std::make_pair(ArgInfo[ArgNo].FirstArgIndex,
1405 ArgInfo[ArgNo].NumberOfArgs);
1406 }
1407
1408private:
1409 void construct(const ASTContext &Context, const CGFunctionInfo &FI,
1410 bool OnlyRequiredArgs);
1411};
1412
1413void ClangToLLVMArgMapping::construct(const ASTContext &Context,
1414 const CGFunctionInfo &FI,
1415 bool OnlyRequiredArgs) {
1416 unsigned IRArgNo = 0;
1417 bool SwapThisWithSRet = false;
1418 const ABIArgInfo &RetAI = FI.getReturnInfo();
1419
1420 if (RetAI.getKind() == ABIArgInfo::Indirect) {
1421 SwapThisWithSRet = RetAI.isSRetAfterThis();
1422 SRetArgNo = SwapThisWithSRet ? 1 : IRArgNo++;
1423 }
1424
1425 unsigned ArgNo = 0;
1426 unsigned NumArgs = OnlyRequiredArgs ? FI.getNumRequiredArgs() : FI.arg_size();
1427 for (CGFunctionInfo::const_arg_iterator I = FI.arg_begin(); ArgNo < NumArgs;
1428 ++I, ++ArgNo) {
1429 assert(I != FI.arg_end())(static_cast <bool> (I != FI.arg_end()) ? void (0) : __assert_fail
("I != FI.arg_end()", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 1429, __extension__ __PRETTY_FUNCTION__))
;
1430 QualType ArgType = I->type;
1431 const ABIArgInfo &AI = I->info;
1432 // Collect data about IR arguments corresponding to Clang argument ArgNo.
1433 auto &IRArgs = ArgInfo[ArgNo];
1434
1435 if (AI.getPaddingType())
1436 IRArgs.PaddingArgIndex = IRArgNo++;
1437
1438 switch (AI.getKind()) {
1439 case ABIArgInfo::Extend:
1440 case ABIArgInfo::Direct: {
1441 // FIXME: handle sseregparm someday...
1442 llvm::StructType *STy = dyn_cast<llvm::StructType>(AI.getCoerceToType());
1443 if (AI.isDirect() && AI.getCanBeFlattened() && STy) {
1444 IRArgs.NumberOfArgs = STy->getNumElements();
1445 } else {
1446 IRArgs.NumberOfArgs = 1;
1447 }
1448 break;
1449 }
1450 case ABIArgInfo::Indirect:
1451 IRArgs.NumberOfArgs = 1;
1452 break;
1453 case ABIArgInfo::Ignore:
1454 case ABIArgInfo::InAlloca:
1455 // ignore and inalloca doesn't have matching LLVM parameters.
1456 IRArgs.NumberOfArgs = 0;
1457 break;
1458 case ABIArgInfo::CoerceAndExpand:
1459 IRArgs.NumberOfArgs = AI.getCoerceAndExpandTypeSequence().size();
1460 break;
1461 case ABIArgInfo::Expand:
1462 IRArgs.NumberOfArgs = getExpansionSize(ArgType, Context);
1463 break;
1464 }
1465
1466 if (IRArgs.NumberOfArgs > 0) {
1467 IRArgs.FirstArgIndex = IRArgNo;
1468 IRArgNo += IRArgs.NumberOfArgs;
1469 }
1470
1471 // Skip over the sret parameter when it comes second. We already handled it
1472 // above.
1473 if (IRArgNo == 1 && SwapThisWithSRet)
1474 IRArgNo++;
1475 }
1476 assert(ArgNo == ArgInfo.size())(static_cast <bool> (ArgNo == ArgInfo.size()) ? void (0
) : __assert_fail ("ArgNo == ArgInfo.size()", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 1476, __extension__ __PRETTY_FUNCTION__))
;
1477
1478 if (FI.usesInAlloca())
1479 InallocaArgNo = IRArgNo++;
1480
1481 TotalIRArgs = IRArgNo;
1482}
1483} // namespace
1484
1485/***/
1486
1487bool CodeGenModule::ReturnTypeUsesSRet(const CGFunctionInfo &FI) {
1488 const auto &RI = FI.getReturnInfo();
1489 return RI.isIndirect() || (RI.isInAlloca() && RI.getInAllocaSRet());
1490}
1491
1492bool CodeGenModule::ReturnSlotInterferesWithArgs(const CGFunctionInfo &FI) {
1493 return ReturnTypeUsesSRet(FI) &&
1494 getTargetCodeGenInfo().doesReturnSlotInterfereWithArgs();
1495}
1496
1497bool CodeGenModule::ReturnTypeUsesFPRet(QualType ResultType) {
1498 if (const BuiltinType *BT = ResultType->getAs<BuiltinType>()) {
1499 switch (BT->getKind()) {
1500 default:
1501 return false;
1502 case BuiltinType::Float:
1503 return getTarget().useObjCFPRetForRealType(TargetInfo::Float);
1504 case BuiltinType::Double:
1505 return getTarget().useObjCFPRetForRealType(TargetInfo::Double);
1506 case BuiltinType::LongDouble:
1507 return getTarget().useObjCFPRetForRealType(TargetInfo::LongDouble);
1508 }
1509 }
1510
1511 return false;
1512}
1513
1514bool CodeGenModule::ReturnTypeUsesFP2Ret(QualType ResultType) {
1515 if (const ComplexType *CT = ResultType->getAs<ComplexType>()) {
1516 if (const BuiltinType *BT = CT->getElementType()->getAs<BuiltinType>()) {
1517 if (BT->getKind() == BuiltinType::LongDouble)
1518 return getTarget().useObjCFP2RetForComplexLongDouble();
1519 }
1520 }
1521
1522 return false;
1523}
1524
1525llvm::FunctionType *CodeGenTypes::GetFunctionType(GlobalDecl GD) {
1526 const CGFunctionInfo &FI = arrangeGlobalDeclaration(GD);
1527 return GetFunctionType(FI);
1528}
1529
1530llvm::FunctionType *
1531CodeGenTypes::GetFunctionType(const CGFunctionInfo &FI) {
1532
1533 bool Inserted = FunctionsBeingProcessed.insert(&FI).second;
1534 (void)Inserted;
1535 assert(Inserted && "Recursively being processed?")(static_cast <bool> (Inserted && "Recursively being processed?"
) ? void (0) : __assert_fail ("Inserted && \"Recursively being processed?\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 1535, __extension__ __PRETTY_FUNCTION__))
;
1536
1537 llvm::Type *resultType = nullptr;
1538 const ABIArgInfo &retAI = FI.getReturnInfo();
1539 switch (retAI.getKind()) {
1540 case ABIArgInfo::Expand:
1541 llvm_unreachable("Invalid ABI kind for return argument")::llvm::llvm_unreachable_internal("Invalid ABI kind for return argument"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 1541)
;
1542
1543 case ABIArgInfo::Extend:
1544 case ABIArgInfo::Direct:
1545 resultType = retAI.getCoerceToType();
1546 break;
1547
1548 case ABIArgInfo::InAlloca:
1549 if (retAI.getInAllocaSRet()) {
1550 // sret things on win32 aren't void, they return the sret pointer.
1551 QualType ret = FI.getReturnType();
1552 llvm::Type *ty = ConvertType(ret);
1553 unsigned addressSpace = Context.getTargetAddressSpace(ret);
1554 resultType = llvm::PointerType::get(ty, addressSpace);
1555 } else {
1556 resultType = llvm::Type::getVoidTy(getLLVMContext());
1557 }
1558 break;
1559
1560 case ABIArgInfo::Indirect:
1561 case ABIArgInfo::Ignore:
1562 resultType = llvm::Type::getVoidTy(getLLVMContext());
1563 break;
1564
1565 case ABIArgInfo::CoerceAndExpand:
1566 resultType = retAI.getUnpaddedCoerceAndExpandType();
1567 break;
1568 }
1569
1570 ClangToLLVMArgMapping IRFunctionArgs(getContext(), FI, true);
1571 SmallVector<llvm::Type*, 8> ArgTypes(IRFunctionArgs.totalIRArgs());
1572
1573 // Add type for sret argument.
1574 if (IRFunctionArgs.hasSRetArg()) {
1575 QualType Ret = FI.getReturnType();
1576 llvm::Type *Ty = ConvertType(Ret);
1577 unsigned AddressSpace = Context.getTargetAddressSpace(Ret);
1578 ArgTypes[IRFunctionArgs.getSRetArgNo()] =
1579 llvm::PointerType::get(Ty, AddressSpace);
1580 }
1581
1582 // Add type for inalloca argument.
1583 if (IRFunctionArgs.hasInallocaArg()) {
1584 auto ArgStruct = FI.getArgStruct();
1585 assert(ArgStruct)(static_cast <bool> (ArgStruct) ? void (0) : __assert_fail
("ArgStruct", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 1585, __extension__ __PRETTY_FUNCTION__))
;
1586 ArgTypes[IRFunctionArgs.getInallocaArgNo()] = ArgStruct->getPointerTo();
1587 }
1588
1589 // Add in all of the required arguments.
1590 unsigned ArgNo = 0;
1591 CGFunctionInfo::const_arg_iterator it = FI.arg_begin(),
1592 ie = it + FI.getNumRequiredArgs();
1593 for (; it != ie; ++it, ++ArgNo) {
1594 const ABIArgInfo &ArgInfo = it->info;
1595
1596 // Insert a padding type to ensure proper alignment.
1597 if (IRFunctionArgs.hasPaddingArg(ArgNo))
1598 ArgTypes[IRFunctionArgs.getPaddingArgNo(ArgNo)] =
1599 ArgInfo.getPaddingType();
1600
1601 unsigned FirstIRArg, NumIRArgs;
1602 std::tie(FirstIRArg, NumIRArgs) = IRFunctionArgs.getIRArgs(ArgNo);
1603
1604 switch (ArgInfo.getKind()) {
1605 case ABIArgInfo::Ignore:
1606 case ABIArgInfo::InAlloca:
1607 assert(NumIRArgs == 0)(static_cast <bool> (NumIRArgs == 0) ? void (0) : __assert_fail
("NumIRArgs == 0", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 1607, __extension__ __PRETTY_FUNCTION__))
;
1608 break;
1609
1610 case ABIArgInfo::Indirect: {
1611 assert(NumIRArgs == 1)(static_cast <bool> (NumIRArgs == 1) ? void (0) : __assert_fail
("NumIRArgs == 1", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 1611, __extension__ __PRETTY_FUNCTION__))
;
1612 // indirect arguments are always on the stack, which is alloca addr space.
1613 llvm::Type *LTy = ConvertTypeForMem(it->type);
1614 ArgTypes[FirstIRArg] = LTy->getPointerTo(
1615 CGM.getDataLayout().getAllocaAddrSpace());
1616 break;
1617 }
1618
1619 case ABIArgInfo::Extend:
1620 case ABIArgInfo::Direct: {
1621 // Fast-isel and the optimizer generally like scalar values better than
1622 // FCAs, so we flatten them if this is safe to do for this argument.
1623 llvm::Type *argType = ArgInfo.getCoerceToType();
1624 llvm::StructType *st = dyn_cast<llvm::StructType>(argType);
1625 if (st && ArgInfo.isDirect() && ArgInfo.getCanBeFlattened()) {
1626 assert(NumIRArgs == st->getNumElements())(static_cast <bool> (NumIRArgs == st->getNumElements
()) ? void (0) : __assert_fail ("NumIRArgs == st->getNumElements()"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 1626, __extension__ __PRETTY_FUNCTION__))
;
1627 for (unsigned i = 0, e = st->getNumElements(); i != e; ++i)
1628 ArgTypes[FirstIRArg + i] = st->getElementType(i);
1629 } else {
1630 assert(NumIRArgs == 1)(static_cast <bool> (NumIRArgs == 1) ? void (0) : __assert_fail
("NumIRArgs == 1", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 1630, __extension__ __PRETTY_FUNCTION__))
;
1631 ArgTypes[FirstIRArg] = argType;
1632 }
1633 break;
1634 }
1635
1636 case ABIArgInfo::CoerceAndExpand: {
1637 auto ArgTypesIter = ArgTypes.begin() + FirstIRArg;
1638 for (auto EltTy : ArgInfo.getCoerceAndExpandTypeSequence()) {
1639 *ArgTypesIter++ = EltTy;
1640 }
1641 assert(ArgTypesIter == ArgTypes.begin() + FirstIRArg + NumIRArgs)(static_cast <bool> (ArgTypesIter == ArgTypes.begin() +
FirstIRArg + NumIRArgs) ? void (0) : __assert_fail ("ArgTypesIter == ArgTypes.begin() + FirstIRArg + NumIRArgs"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 1641, __extension__ __PRETTY_FUNCTION__))
;
1642 break;
1643 }
1644
1645 case ABIArgInfo::Expand:
1646 auto ArgTypesIter = ArgTypes.begin() + FirstIRArg;
1647 getExpandedTypes(it->type, ArgTypesIter);
1648 assert(ArgTypesIter == ArgTypes.begin() + FirstIRArg + NumIRArgs)(static_cast <bool> (ArgTypesIter == ArgTypes.begin() +
FirstIRArg + NumIRArgs) ? void (0) : __assert_fail ("ArgTypesIter == ArgTypes.begin() + FirstIRArg + NumIRArgs"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 1648, __extension__ __PRETTY_FUNCTION__))
;
1649 break;
1650 }
1651 }
1652
1653 bool Erased = FunctionsBeingProcessed.erase(&FI); (void)Erased;
1654 assert(Erased && "Not in set?")(static_cast <bool> (Erased && "Not in set?") ?
void (0) : __assert_fail ("Erased && \"Not in set?\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 1654, __extension__ __PRETTY_FUNCTION__))
;
1655
1656 return llvm::FunctionType::get(resultType, ArgTypes, FI.isVariadic());
1657}
1658
1659llvm::Type *CodeGenTypes::GetFunctionTypeForVTable(GlobalDecl GD) {
1660 const CXXMethodDecl *MD = cast<CXXMethodDecl>(GD.getDecl());
1661 const FunctionProtoType *FPT = MD->getType()->getAs<FunctionProtoType>();
1662
1663 if (!isFuncTypeConvertible(FPT))
1664 return llvm::StructType::get(getLLVMContext());
1665
1666 const CGFunctionInfo *Info;
1667 if (isa<CXXDestructorDecl>(MD))
1668 Info =
1669 &arrangeCXXStructorDeclaration(MD, getFromDtorType(GD.getDtorType()));
1670 else
1671 Info = &arrangeCXXMethodDeclaration(MD);
1672 return GetFunctionType(*Info);
1673}
1674
1675static void AddAttributesFromFunctionProtoType(ASTContext &Ctx,
1676 llvm::AttrBuilder &FuncAttrs,
1677 const FunctionProtoType *FPT) {
1678 if (!FPT)
1679 return;
1680
1681 if (!isUnresolvedExceptionSpec(FPT->getExceptionSpecType()) &&
1682 FPT->isNothrow(Ctx))
1683 FuncAttrs.addAttribute(llvm::Attribute::NoUnwind);
1684}
1685
1686void CodeGenModule::ConstructDefaultFnAttrList(StringRef Name, bool HasOptnone,
1687 bool AttrOnCallSite,
1688 llvm::AttrBuilder &FuncAttrs) {
1689 // OptimizeNoneAttr takes precedence over -Os or -Oz. No warning needed.
1690 if (!HasOptnone) {
1691 if (CodeGenOpts.OptimizeSize)
1692 FuncAttrs.addAttribute(llvm::Attribute::OptimizeForSize);
1693 if (CodeGenOpts.OptimizeSize == 2)
1694 FuncAttrs.addAttribute(llvm::Attribute::MinSize);
1695 }
1696
1697 if (CodeGenOpts.DisableRedZone)
1698 FuncAttrs.addAttribute(llvm::Attribute::NoRedZone);
1699 if (CodeGenOpts.NoImplicitFloat)
1700 FuncAttrs.addAttribute(llvm::Attribute::NoImplicitFloat);
1701
1702 if (AttrOnCallSite) {
1703 // Attributes that should go on the call site only.
1704 if (!CodeGenOpts.SimplifyLibCalls ||
1705 CodeGenOpts.isNoBuiltinFunc(Name.data()))
1706 FuncAttrs.addAttribute(llvm::Attribute::NoBuiltin);
1707 if (!CodeGenOpts.TrapFuncName.empty())
1708 FuncAttrs.addAttribute("trap-func-name", CodeGenOpts.TrapFuncName);
1709 } else {
1710 // Attributes that should go on the function, but not the call site.
1711 if (!CodeGenOpts.DisableFPElim) {
1712 FuncAttrs.addAttribute("no-frame-pointer-elim", "false");
1713 } else if (CodeGenOpts.OmitLeafFramePointer) {
1714 FuncAttrs.addAttribute("no-frame-pointer-elim", "false");
1715 FuncAttrs.addAttribute("no-frame-pointer-elim-non-leaf");
1716 } else {
1717 FuncAttrs.addAttribute("no-frame-pointer-elim", "true");
1718 FuncAttrs.addAttribute("no-frame-pointer-elim-non-leaf");
1719 }
1720
1721 FuncAttrs.addAttribute("less-precise-fpmad",
1722 llvm::toStringRef(CodeGenOpts.LessPreciseFPMAD));
1723
1724 if (!CodeGenOpts.FPDenormalMode.empty())
1725 FuncAttrs.addAttribute("denormal-fp-math", CodeGenOpts.FPDenormalMode);
1726
1727 FuncAttrs.addAttribute("no-trapping-math",
1728 llvm::toStringRef(CodeGenOpts.NoTrappingMath));
1729
1730 // TODO: Are these all needed?
1731 // unsafe/inf/nan/nsz are handled by instruction-level FastMathFlags.
1732 FuncAttrs.addAttribute("no-infs-fp-math",
1733 llvm::toStringRef(CodeGenOpts.NoInfsFPMath));
1734 FuncAttrs.addAttribute("no-nans-fp-math",
1735 llvm::toStringRef(CodeGenOpts.NoNaNsFPMath));
1736 FuncAttrs.addAttribute("unsafe-fp-math",
1737 llvm::toStringRef(CodeGenOpts.UnsafeFPMath));
1738 FuncAttrs.addAttribute("use-soft-float",
1739 llvm::toStringRef(CodeGenOpts.SoftFloat));
1740 FuncAttrs.addAttribute("stack-protector-buffer-size",
1741 llvm::utostr(CodeGenOpts.SSPBufferSize));
1742 FuncAttrs.addAttribute("no-signed-zeros-fp-math",
1743 llvm::toStringRef(CodeGenOpts.NoSignedZeros));
1744 FuncAttrs.addAttribute(
1745 "correctly-rounded-divide-sqrt-fp-math",
1746 llvm::toStringRef(CodeGenOpts.CorrectlyRoundedDivSqrt));
1747
1748 // TODO: Reciprocal estimate codegen options should apply to instructions?
1749 const std::vector<std::string> &Recips = CodeGenOpts.Reciprocals;
1750 if (!Recips.empty())
1751 FuncAttrs.addAttribute("reciprocal-estimates",
1752 llvm::join(Recips, ","));
1753
1754 if (!CodeGenOpts.PreferVectorWidth.empty() &&
1755 CodeGenOpts.PreferVectorWidth != "none")
1756 FuncAttrs.addAttribute("prefer-vector-width",
1757 CodeGenOpts.PreferVectorWidth);
1758
1759 if (CodeGenOpts.StackRealignment)
1760 FuncAttrs.addAttribute("stackrealign");
1761 if (CodeGenOpts.Backchain)
1762 FuncAttrs.addAttribute("backchain");
1763 }
1764
1765 if (getLangOpts().assumeFunctionsAreConvergent()) {
1766 // Conservatively, mark all functions and calls in CUDA and OpenCL as
1767 // convergent (meaning, they may call an intrinsically convergent op, such
1768 // as __syncthreads() / barrier(), and so can't have certain optimizations
1769 // applied around them). LLVM will remove this attribute where it safely
1770 // can.
1771 FuncAttrs.addAttribute(llvm::Attribute::Convergent);
1772 }
1773
1774 if (getLangOpts().CUDA && getLangOpts().CUDAIsDevice) {
1775 // Exceptions aren't supported in CUDA device code.
1776 FuncAttrs.addAttribute(llvm::Attribute::NoUnwind);
1777
1778 // Respect -fcuda-flush-denormals-to-zero.
1779 if (getLangOpts().CUDADeviceFlushDenormalsToZero)
1780 FuncAttrs.addAttribute("nvptx-f32ftz", "true");
1781 }
1782}
1783
1784void CodeGenModule::AddDefaultFnAttrs(llvm::Function &F) {
1785 llvm::AttrBuilder FuncAttrs;
1786 ConstructDefaultFnAttrList(F.getName(),
1787 F.hasFnAttribute(llvm::Attribute::OptimizeNone),
1788 /* AttrOnCallsite = */ false, FuncAttrs);
1789 F.addAttributes(llvm::AttributeList::FunctionIndex, FuncAttrs);
1790}
1791
1792void CodeGenModule::ConstructAttributeList(
1793 StringRef Name, const CGFunctionInfo &FI, CGCalleeInfo CalleeInfo,
1794 llvm::AttributeList &AttrList, unsigned &CallingConv, bool AttrOnCallSite) {
1795 llvm::AttrBuilder FuncAttrs;
1796 llvm::AttrBuilder RetAttrs;
1797
1798 CallingConv = FI.getEffectiveCallingConvention();
1799 if (FI.isNoReturn())
1800 FuncAttrs.addAttribute(llvm::Attribute::NoReturn);
1801
1802 // If we have information about the function prototype, we can learn
1803 // attributes form there.
1804 AddAttributesFromFunctionProtoType(getContext(), FuncAttrs,
1805 CalleeInfo.getCalleeFunctionProtoType());
1806
1807 const Decl *TargetDecl = CalleeInfo.getCalleeDecl();
1808
1809 bool HasOptnone = false;
1810 // FIXME: handle sseregparm someday...
1811 if (TargetDecl) {
1812 if (TargetDecl->hasAttr<ReturnsTwiceAttr>())
1813 FuncAttrs.addAttribute(llvm::Attribute::ReturnsTwice);
1814 if (TargetDecl->hasAttr<NoThrowAttr>())
1815 FuncAttrs.addAttribute(llvm::Attribute::NoUnwind);
1816 if (TargetDecl->hasAttr<NoReturnAttr>())
1817 FuncAttrs.addAttribute(llvm::Attribute::NoReturn);
1818 if (TargetDecl->hasAttr<ColdAttr>())
1819 FuncAttrs.addAttribute(llvm::Attribute::Cold);
1820 if (TargetDecl->hasAttr<NoDuplicateAttr>())
1821 FuncAttrs.addAttribute(llvm::Attribute::NoDuplicate);
1822 if (TargetDecl->hasAttr<ConvergentAttr>())
1823 FuncAttrs.addAttribute(llvm::Attribute::Convergent);
1824
1825 if (const FunctionDecl *Fn = dyn_cast<FunctionDecl>(TargetDecl)) {
1826 AddAttributesFromFunctionProtoType(
1827 getContext(), FuncAttrs, Fn->getType()->getAs<FunctionProtoType>());
1828 // Don't use [[noreturn]] or _Noreturn for a call to a virtual function.
1829 // These attributes are not inherited by overloads.
1830 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Fn);
1831 if (Fn->isNoReturn() && !(AttrOnCallSite && MD && MD->isVirtual()))
1832 FuncAttrs.addAttribute(llvm::Attribute::NoReturn);
1833 }
1834
1835 // 'const', 'pure' and 'noalias' attributed functions are also nounwind.
1836 if (TargetDecl->hasAttr<ConstAttr>()) {
1837 FuncAttrs.addAttribute(llvm::Attribute::ReadNone);
1838 FuncAttrs.addAttribute(llvm::Attribute::NoUnwind);
1839 } else if (TargetDecl->hasAttr<PureAttr>()) {
1840 FuncAttrs.addAttribute(llvm::Attribute::ReadOnly);
1841 FuncAttrs.addAttribute(llvm::Attribute::NoUnwind);
1842 } else if (TargetDecl->hasAttr<NoAliasAttr>()) {
1843 FuncAttrs.addAttribute(llvm::Attribute::ArgMemOnly);
1844 FuncAttrs.addAttribute(llvm::Attribute::NoUnwind);
1845 }
1846 if (TargetDecl->hasAttr<RestrictAttr>())
1847 RetAttrs.addAttribute(llvm::Attribute::NoAlias);
1848 if (TargetDecl->hasAttr<ReturnsNonNullAttr>())
1849 RetAttrs.addAttribute(llvm::Attribute::NonNull);
1850 if (TargetDecl->hasAttr<AnyX86NoCallerSavedRegistersAttr>())
1851 FuncAttrs.addAttribute("no_caller_saved_registers");
1852 if (TargetDecl->hasAttr<AnyX86NoCfCheckAttr>())
1853 FuncAttrs.addAttribute(llvm::Attribute::NoCfCheck);
1854
1855 HasOptnone = TargetDecl->hasAttr<OptimizeNoneAttr>();
1856 if (auto *AllocSize = TargetDecl->getAttr<AllocSizeAttr>()) {
1857 Optional<unsigned> NumElemsParam;
1858 if (AllocSize->getNumElemsParam().isValid())
1859 NumElemsParam = AllocSize->getNumElemsParam().getLLVMIndex();
1860 FuncAttrs.addAllocSizeAttr(AllocSize->getElemSizeParam().getLLVMIndex(),
1861 NumElemsParam);
1862 }
1863 }
1864
1865 ConstructDefaultFnAttrList(Name, HasOptnone, AttrOnCallSite, FuncAttrs);
1866
1867 if (CodeGenOpts.EnableSegmentedStacks &&
1868 !(TargetDecl && TargetDecl->hasAttr<NoSplitStackAttr>()))
1869 FuncAttrs.addAttribute("split-stack");
1870
1871 // Add NonLazyBind attribute to function declarations when -fno-plt
1872 // is used.
1873 if (TargetDecl && CodeGenOpts.NoPLT) {
1874 if (auto *Fn = dyn_cast<FunctionDecl>(TargetDecl)) {
1875 if (!Fn->isDefined() && !AttrOnCallSite) {
1876 FuncAttrs.addAttribute(llvm::Attribute::NonLazyBind);
1877 }
1878 }
1879 }
1880
1881 if (TargetDecl && TargetDecl->hasAttr<OpenCLKernelAttr>()) {
1882 if (getLangOpts().OpenCLVersion <= 120) {
1883 // OpenCL v1.2 Work groups are always uniform
1884 FuncAttrs.addAttribute("uniform-work-group-size", "true");
1885 } else {
1886 // OpenCL v2.0 Work groups may be whether uniform or not.
1887 // '-cl-uniform-work-group-size' compile option gets a hint
1888 // to the compiler that the global work-size be a multiple of
1889 // the work-group size specified to clEnqueueNDRangeKernel
1890 // (i.e. work groups are uniform).
1891 FuncAttrs.addAttribute("uniform-work-group-size",
1892 llvm::toStringRef(CodeGenOpts.UniformWGSize));
1893 }
1894 }
1895
1896 if (!AttrOnCallSite) {
1897 bool DisableTailCalls = false;
1898
1899 if (CodeGenOpts.DisableTailCalls)
1900 DisableTailCalls = true;
1901 else if (TargetDecl) {
1902 if (TargetDecl->hasAttr<DisableTailCallsAttr>() ||
1903 TargetDecl->hasAttr<AnyX86InterruptAttr>())
1904 DisableTailCalls = true;
1905 else if (CodeGenOpts.NoEscapingBlockTailCalls) {
1906 if (const auto *BD = dyn_cast<BlockDecl>(TargetDecl))
1907 if (!BD->doesNotEscape())
1908 DisableTailCalls = true;
1909 }
1910 }
1911
1912 FuncAttrs.addAttribute("disable-tail-calls",
1913 llvm::toStringRef(DisableTailCalls));
1914 GetCPUAndFeaturesAttributes(TargetDecl, FuncAttrs);
1915 }
1916
1917 ClangToLLVMArgMapping IRFunctionArgs(getContext(), FI);
1918
1919 QualType RetTy = FI.getReturnType();
1920 const ABIArgInfo &RetAI = FI.getReturnInfo();
1921 switch (RetAI.getKind()) {
1922 case ABIArgInfo::Extend:
1923 if (RetAI.isSignExt())
1924 RetAttrs.addAttribute(llvm::Attribute::SExt);
1925 else
1926 RetAttrs.addAttribute(llvm::Attribute::ZExt);
1927 LLVM_FALLTHROUGH[[clang::fallthrough]];
1928 case ABIArgInfo::Direct:
1929 if (RetAI.getInReg())
1930 RetAttrs.addAttribute(llvm::Attribute::InReg);
1931 break;
1932 case ABIArgInfo::Ignore:
1933 break;
1934
1935 case ABIArgInfo::InAlloca:
1936 case ABIArgInfo::Indirect: {
1937 // inalloca and sret disable readnone and readonly
1938 FuncAttrs.removeAttribute(llvm::Attribute::ReadOnly)
1939 .removeAttribute(llvm::Attribute::ReadNone);
1940 break;
1941 }
1942
1943 case ABIArgInfo::CoerceAndExpand:
1944 break;
1945
1946 case ABIArgInfo::Expand:
1947 llvm_unreachable("Invalid ABI kind for return argument")::llvm::llvm_unreachable_internal("Invalid ABI kind for return argument"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 1947)
;
1948 }
1949
1950 if (const auto *RefTy = RetTy->getAs<ReferenceType>()) {
1951 QualType PTy = RefTy->getPointeeType();
1952 if (!PTy->isIncompleteType() && PTy->isConstantSizeType())
1953 RetAttrs.addDereferenceableAttr(getContext().getTypeSizeInChars(PTy)
1954 .getQuantity());
1955 else if (getContext().getTargetAddressSpace(PTy) == 0)
1956 RetAttrs.addAttribute(llvm::Attribute::NonNull);
1957 }
1958
1959 bool hasUsedSRet = false;
1960 SmallVector<llvm::AttributeSet, 4> ArgAttrs(IRFunctionArgs.totalIRArgs());
1961
1962 // Attach attributes to sret.
1963 if (IRFunctionArgs.hasSRetArg()) {
1964 llvm::AttrBuilder SRETAttrs;
1965 SRETAttrs.addAttribute(llvm::Attribute::StructRet);
1966 hasUsedSRet = true;
1967 if (RetAI.getInReg())
1968 SRETAttrs.addAttribute(llvm::Attribute::InReg);
1969 ArgAttrs[IRFunctionArgs.getSRetArgNo()] =
1970 llvm::AttributeSet::get(getLLVMContext(), SRETAttrs);
1971 }
1972
1973 // Attach attributes to inalloca argument.
1974 if (IRFunctionArgs.hasInallocaArg()) {
1975 llvm::AttrBuilder Attrs;
1976 Attrs.addAttribute(llvm::Attribute::InAlloca);
1977 ArgAttrs[IRFunctionArgs.getInallocaArgNo()] =
1978 llvm::AttributeSet::get(getLLVMContext(), Attrs);
1979 }
1980
1981 unsigned ArgNo = 0;
1982 for (CGFunctionInfo::const_arg_iterator I = FI.arg_begin(),
1983 E = FI.arg_end();
1984 I != E; ++I, ++ArgNo) {
1985 QualType ParamType = I->type;
1986 const ABIArgInfo &AI = I->info;
1987 llvm::AttrBuilder Attrs;
1988
1989 // Add attribute for padding argument, if necessary.
1990 if (IRFunctionArgs.hasPaddingArg(ArgNo)) {
1991 if (AI.getPaddingInReg()) {
1992 ArgAttrs[IRFunctionArgs.getPaddingArgNo(ArgNo)] =
1993 llvm::AttributeSet::get(
1994 getLLVMContext(),
1995 llvm::AttrBuilder().addAttribute(llvm::Attribute::InReg));
1996 }
1997 }
1998
1999 // 'restrict' -> 'noalias' is done in EmitFunctionProlog when we
2000 // have the corresponding parameter variable. It doesn't make
2001 // sense to do it here because parameters are so messed up.
2002 switch (AI.getKind()) {
2003 case ABIArgInfo::Extend:
2004 if (AI.isSignExt())
2005 Attrs.addAttribute(llvm::Attribute::SExt);
2006 else
2007 Attrs.addAttribute(llvm::Attribute::ZExt);
2008 LLVM_FALLTHROUGH[[clang::fallthrough]];
2009 case ABIArgInfo::Direct:
2010 if (ArgNo == 0 && FI.isChainCall())
2011 Attrs.addAttribute(llvm::Attribute::Nest);
2012 else if (AI.getInReg())
2013 Attrs.addAttribute(llvm::Attribute::InReg);
2014 break;
2015
2016 case ABIArgInfo::Indirect: {
2017 if (AI.getInReg())
2018 Attrs.addAttribute(llvm::Attribute::InReg);
2019
2020 if (AI.getIndirectByVal())
2021 Attrs.addAttribute(llvm::Attribute::ByVal);
2022
2023 CharUnits Align = AI.getIndirectAlign();
2024
2025 // In a byval argument, it is important that the required
2026 // alignment of the type is honored, as LLVM might be creating a
2027 // *new* stack object, and needs to know what alignment to give
2028 // it. (Sometimes it can deduce a sensible alignment on its own,
2029 // but not if clang decides it must emit a packed struct, or the
2030 // user specifies increased alignment requirements.)
2031 //
2032 // This is different from indirect *not* byval, where the object
2033 // exists already, and the align attribute is purely
2034 // informative.
2035 assert(!Align.isZero())(static_cast <bool> (!Align.isZero()) ? void (0) : __assert_fail
("!Align.isZero()", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 2035, __extension__ __PRETTY_FUNCTION__))
;
2036
2037 // For now, only add this when we have a byval argument.
2038 // TODO: be less lazy about updating test cases.
2039 if (AI.getIndirectByVal())
2040 Attrs.addAlignmentAttr(Align.getQuantity());
2041
2042 // byval disables readnone and readonly.
2043 FuncAttrs.removeAttribute(llvm::Attribute::ReadOnly)
2044 .removeAttribute(llvm::Attribute::ReadNone);
2045 break;
2046 }
2047 case ABIArgInfo::Ignore:
2048 case ABIArgInfo::Expand:
2049 case ABIArgInfo::CoerceAndExpand:
2050 break;
2051
2052 case ABIArgInfo::InAlloca:
2053 // inalloca disables readnone and readonly.
2054 FuncAttrs.removeAttribute(llvm::Attribute::ReadOnly)
2055 .removeAttribute(llvm::Attribute::ReadNone);
2056 continue;
2057 }
2058
2059 if (const auto *RefTy = ParamType->getAs<ReferenceType>()) {
2060 QualType PTy = RefTy->getPointeeType();
2061 if (!PTy->isIncompleteType() && PTy->isConstantSizeType())
2062 Attrs.addDereferenceableAttr(getContext().getTypeSizeInChars(PTy)
2063 .getQuantity());
2064 else if (getContext().getTargetAddressSpace(PTy) == 0)
2065 Attrs.addAttribute(llvm::Attribute::NonNull);
2066 }
2067
2068 switch (FI.getExtParameterInfo(ArgNo).getABI()) {
2069 case ParameterABI::Ordinary:
2070 break;
2071
2072 case ParameterABI::SwiftIndirectResult: {
2073 // Add 'sret' if we haven't already used it for something, but
2074 // only if the result is void.
2075 if (!hasUsedSRet && RetTy->isVoidType()) {
2076 Attrs.addAttribute(llvm::Attribute::StructRet);
2077 hasUsedSRet = true;
2078 }
2079
2080 // Add 'noalias' in either case.
2081 Attrs.addAttribute(llvm::Attribute::NoAlias);
2082
2083 // Add 'dereferenceable' and 'alignment'.
2084 auto PTy = ParamType->getPointeeType();
2085 if (!PTy->isIncompleteType() && PTy->isConstantSizeType()) {
2086 auto info = getContext().getTypeInfoInChars(PTy);
2087 Attrs.addDereferenceableAttr(info.first.getQuantity());
2088 Attrs.addAttribute(llvm::Attribute::getWithAlignment(getLLVMContext(),
2089 info.second.getQuantity()));
2090 }
2091 break;
2092 }
2093
2094 case ParameterABI::SwiftErrorResult:
2095 Attrs.addAttribute(llvm::Attribute::SwiftError);
2096 break;
2097
2098 case ParameterABI::SwiftContext:
2099 Attrs.addAttribute(llvm::Attribute::SwiftSelf);
2100 break;
2101 }
2102
2103 if (FI.getExtParameterInfo(ArgNo).isNoEscape())
2104 Attrs.addAttribute(llvm::Attribute::NoCapture);
2105
2106 if (Attrs.hasAttributes()) {
2107 unsigned FirstIRArg, NumIRArgs;
2108 std::tie(FirstIRArg, NumIRArgs) = IRFunctionArgs.getIRArgs(ArgNo);
2109 for (unsigned i = 0; i < NumIRArgs; i++)
2110 ArgAttrs[FirstIRArg + i] =
2111 llvm::AttributeSet::get(getLLVMContext(), Attrs);
2112 }
2113 }
2114 assert(ArgNo == FI.arg_size())(static_cast <bool> (ArgNo == FI.arg_size()) ? void (0)
: __assert_fail ("ArgNo == FI.arg_size()", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 2114, __extension__ __PRETTY_FUNCTION__))
;
2115
2116 AttrList = llvm::AttributeList::get(
2117 getLLVMContext(), llvm::AttributeSet::get(getLLVMContext(), FuncAttrs),
2118 llvm::AttributeSet::get(getLLVMContext(), RetAttrs), ArgAttrs);
2119}
2120
2121/// An argument came in as a promoted argument; demote it back to its
2122/// declared type.
2123static llvm::Value *emitArgumentDemotion(CodeGenFunction &CGF,
2124 const VarDecl *var,
2125 llvm::Value *value) {
2126 llvm::Type *varType = CGF.ConvertType(var->getType());
2127
2128 // This can happen with promotions that actually don't change the
2129 // underlying type, like the enum promotions.
2130 if (value->getType() == varType) return value;
2131
2132 assert((varType->isIntegerTy() || varType->isFloatingPointTy())(static_cast <bool> ((varType->isIntegerTy() || varType
->isFloatingPointTy()) && "unexpected promotion type"
) ? void (0) : __assert_fail ("(varType->isIntegerTy() || varType->isFloatingPointTy()) && \"unexpected promotion type\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 2133, __extension__ __PRETTY_FUNCTION__))
2133 && "unexpected promotion type")(static_cast <bool> ((varType->isIntegerTy() || varType
->isFloatingPointTy()) && "unexpected promotion type"
) ? void (0) : __assert_fail ("(varType->isIntegerTy() || varType->isFloatingPointTy()) && \"unexpected promotion type\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 2133, __extension__ __PRETTY_FUNCTION__))
;
2134
2135 if (isa<llvm::IntegerType>(varType))
2136 return CGF.Builder.CreateTrunc(value, varType, "arg.unpromote");
2137
2138 return CGF.Builder.CreateFPCast(value, varType, "arg.unpromote");
2139}
2140
2141/// Returns the attribute (either parameter attribute, or function
2142/// attribute), which declares argument ArgNo to be non-null.
2143static const NonNullAttr *getNonNullAttr(const Decl *FD, const ParmVarDecl *PVD,
2144 QualType ArgType, unsigned ArgNo) {
2145 // FIXME: __attribute__((nonnull)) can also be applied to:
2146 // - references to pointers, where the pointee is known to be
2147 // nonnull (apparently a Clang extension)
2148 // - transparent unions containing pointers
2149 // In the former case, LLVM IR cannot represent the constraint. In
2150 // the latter case, we have no guarantee that the transparent union
2151 // is in fact passed as a pointer.
2152 if (!ArgType->isAnyPointerType() && !ArgType->isBlockPointerType())
2153 return nullptr;
2154 // First, check attribute on parameter itself.
2155 if (PVD) {
2156 if (auto ParmNNAttr = PVD->getAttr<NonNullAttr>())
2157 return ParmNNAttr;
2158 }
2159 // Check function attributes.
2160 if (!FD)
2161 return nullptr;
2162 for (const auto *NNAttr : FD->specific_attrs<NonNullAttr>()) {
2163 if (NNAttr->isNonNull(ArgNo))
2164 return NNAttr;
2165 }
2166 return nullptr;
2167}
2168
2169namespace {
2170 struct CopyBackSwiftError final : EHScopeStack::Cleanup {
2171 Address Temp;
2172 Address Arg;
2173 CopyBackSwiftError(Address temp, Address arg) : Temp(temp), Arg(arg) {}
2174 void Emit(CodeGenFunction &CGF, Flags flags) override {
2175 llvm::Value *errorValue = CGF.Builder.CreateLoad(Temp);
2176 CGF.Builder.CreateStore(errorValue, Arg);
2177 }
2178 };
2179}
2180
2181void CodeGenFunction::EmitFunctionProlog(const CGFunctionInfo &FI,
2182 llvm::Function *Fn,
2183 const FunctionArgList &Args) {
2184 if (CurCodeDecl && CurCodeDecl->hasAttr<NakedAttr>())
1
Assuming the condition is false
2185 // Naked functions don't have prologues.
2186 return;
2187
2188 // If this is an implicit-return-zero function, go ahead and
2189 // initialize the return value. TODO: it might be nice to have
2190 // a more general mechanism for this that didn't require synthesized
2191 // return statements.
2192 if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(CurCodeDecl)) {
2
Taking false branch
2193 if (FD->hasImplicitReturnZero()) {
2194 QualType RetTy = FD->getReturnType().getUnqualifiedType();
2195 llvm::Type* LLVMTy = CGM.getTypes().ConvertType(RetTy);
2196 llvm::Constant* Zero = llvm::Constant::getNullValue(LLVMTy);
2197 Builder.CreateStore(Zero, ReturnValue);
2198 }
2199 }
2200
2201 // FIXME: We no longer need the types from FunctionArgList; lift up and
2202 // simplify.
2203
2204 ClangToLLVMArgMapping IRFunctionArgs(CGM.getContext(), FI);
2205 // Flattened function arguments.
2206 SmallVector<llvm::Value *, 16> FnArgs;
2207 FnArgs.reserve(IRFunctionArgs.totalIRArgs());
2208 for (auto &Arg : Fn->args()) {
3
Assuming '__begin1' is equal to '__end1'
2209 FnArgs.push_back(&Arg);
2210 }
2211 assert(FnArgs.size() == IRFunctionArgs.totalIRArgs())(static_cast <bool> (FnArgs.size() == IRFunctionArgs.totalIRArgs
()) ? void (0) : __assert_fail ("FnArgs.size() == IRFunctionArgs.totalIRArgs()"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 2211, __extension__ __PRETTY_FUNCTION__))
;
2212
2213 // If we're using inalloca, all the memory arguments are GEPs off of the last
2214 // parameter, which is a pointer to the complete memory area.
2215 Address ArgStruct = Address::invalid();
2216 const llvm::StructLayout *ArgStructLayout = nullptr;
4
'ArgStructLayout' initialized to a null pointer value
2217 if (IRFunctionArgs.hasInallocaArg()) {
5
Taking false branch
2218 ArgStructLayout = CGM.getDataLayout().getStructLayout(FI.getArgStruct());
2219 ArgStruct = Address(FnArgs[IRFunctionArgs.getInallocaArgNo()],
2220 FI.getArgStructAlignment());
2221
2222 assert(ArgStruct.getType() == FI.getArgStruct()->getPointerTo())(static_cast <bool> (ArgStruct.getType() == FI.getArgStruct
()->getPointerTo()) ? void (0) : __assert_fail ("ArgStruct.getType() == FI.getArgStruct()->getPointerTo()"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 2222, __extension__ __PRETTY_FUNCTION__))
;
2223 }
2224
2225 // Name the struct return parameter.
2226 if (IRFunctionArgs.hasSRetArg()) {
6
Taking false branch
2227 auto AI = cast<llvm::Argument>(FnArgs[IRFunctionArgs.getSRetArgNo()]);
2228 AI->setName("agg.result");
2229 AI->addAttr(llvm::Attribute::NoAlias);
2230 }
2231
2232 // Track if we received the parameter as a pointer (indirect, byval, or
2233 // inalloca). If already have a pointer, EmitParmDecl doesn't need to copy it
2234 // into a local alloca for us.
2235 SmallVector<ParamValue, 16> ArgVals;
2236 ArgVals.reserve(Args.size());
2237
2238 // Create a pointer value for every parameter declaration. This usually
2239 // entails copying one or more LLVM IR arguments into an alloca. Don't push
2240 // any cleanups or do anything that might unwind. We do that separately, so
2241 // we can push the cleanups in the correct order for the ABI.
2242 assert(FI.arg_size() == Args.size() &&(static_cast <bool> (FI.arg_size() == Args.size() &&
"Mismatch between function signature & arguments.") ? void
(0) : __assert_fail ("FI.arg_size() == Args.size() && \"Mismatch between function signature & arguments.\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 2243, __extension__ __PRETTY_FUNCTION__))
2243 "Mismatch between function signature & arguments.")(static_cast <bool> (FI.arg_size() == Args.size() &&
"Mismatch between function signature & arguments.") ? void
(0) : __assert_fail ("FI.arg_size() == Args.size() && \"Mismatch between function signature & arguments.\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 2243, __extension__ __PRETTY_FUNCTION__))
;
2244 unsigned ArgNo = 0;
2245 CGFunctionInfo::const_arg_iterator info_it = FI.arg_begin();
2246 for (FunctionArgList::const_iterator i = Args.begin(), e = Args.end();
8
Loop condition is true. Entering loop body
2247 i != e; ++i, ++info_it, ++ArgNo) {
7
Assuming 'i' is not equal to 'e'
2248 const VarDecl *Arg = *i;
2249 const ABIArgInfo &ArgI = info_it->info;
2250
2251 bool isPromoted =
2252 isa<ParmVarDecl>(Arg) && cast<ParmVarDecl>(Arg)->isKNRPromoted();
2253 // We are converting from ABIArgInfo type to VarDecl type directly, unless
2254 // the parameter is promoted. In this case we convert to
2255 // CGFunctionInfo::ArgInfo type with subsequent argument demotion.
2256 QualType Ty = isPromoted ? info_it->type : Arg->getType();
9
'?' condition is false
2257 assert(hasScalarEvaluationKind(Ty) ==(static_cast <bool> (hasScalarEvaluationKind(Ty) == hasScalarEvaluationKind
(Arg->getType())) ? void (0) : __assert_fail ("hasScalarEvaluationKind(Ty) == hasScalarEvaluationKind(Arg->getType())"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 2258, __extension__ __PRETTY_FUNCTION__))
2258 hasScalarEvaluationKind(Arg->getType()))(static_cast <bool> (hasScalarEvaluationKind(Ty) == hasScalarEvaluationKind
(Arg->getType())) ? void (0) : __assert_fail ("hasScalarEvaluationKind(Ty) == hasScalarEvaluationKind(Arg->getType())"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 2258, __extension__ __PRETTY_FUNCTION__))
;
2259
2260 unsigned FirstIRArg, NumIRArgs;
2261 std::tie(FirstIRArg, NumIRArgs) = IRFunctionArgs.getIRArgs(ArgNo);
2262
2263 switch (ArgI.getKind()) {
10
Control jumps to 'case InAlloca:' at line 2264
2264 case ABIArgInfo::InAlloca: {
2265 assert(NumIRArgs == 0)(static_cast <bool> (NumIRArgs == 0) ? void (0) : __assert_fail
("NumIRArgs == 0", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 2265, __extension__ __PRETTY_FUNCTION__))
;
2266 auto FieldIndex = ArgI.getInAllocaFieldIndex();
2267 CharUnits FieldOffset =
2268 CharUnits::fromQuantity(ArgStructLayout->getElementOffset(FieldIndex));
11
Called C++ object pointer is null
2269 Address V = Builder.CreateStructGEP(ArgStruct, FieldIndex, FieldOffset,
2270 Arg->getName());
2271 ArgVals.push_back(ParamValue::forIndirect(V));
2272 break;
2273 }
2274
2275 case ABIArgInfo::Indirect: {
2276 assert(NumIRArgs == 1)(static_cast <bool> (NumIRArgs == 1) ? void (0) : __assert_fail
("NumIRArgs == 1", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 2276, __extension__ __PRETTY_FUNCTION__))
;
2277 Address ParamAddr = Address(FnArgs[FirstIRArg], ArgI.getIndirectAlign());
2278
2279 if (!hasScalarEvaluationKind(Ty)) {
2280 // Aggregates and complex variables are accessed by reference. All we
2281 // need to do is realign the value, if requested.
2282 Address V = ParamAddr;
2283 if (ArgI.getIndirectRealign()) {
2284 Address AlignedTemp = CreateMemTemp(Ty, "coerce");
2285
2286 // Copy from the incoming argument pointer to the temporary with the
2287 // appropriate alignment.
2288 //
2289 // FIXME: We should have a common utility for generating an aggregate
2290 // copy.
2291 CharUnits Size = getContext().getTypeSizeInChars(Ty);
2292 auto SizeVal = llvm::ConstantInt::get(IntPtrTy, Size.getQuantity());
2293 Address Dst = Builder.CreateBitCast(AlignedTemp, Int8PtrTy);
2294 Address Src = Builder.CreateBitCast(ParamAddr, Int8PtrTy);
2295 Builder.CreateMemCpy(Dst, Src, SizeVal, false);
2296 V = AlignedTemp;
2297 }
2298 ArgVals.push_back(ParamValue::forIndirect(V));
2299 } else {
2300 // Load scalar value from indirect argument.
2301 llvm::Value *V =
2302 EmitLoadOfScalar(ParamAddr, false, Ty, Arg->getLocStart());
2303
2304 if (isPromoted)
2305 V = emitArgumentDemotion(*this, Arg, V);
2306 ArgVals.push_back(ParamValue::forDirect(V));
2307 }
2308 break;
2309 }
2310
2311 case ABIArgInfo::Extend:
2312 case ABIArgInfo::Direct: {
2313
2314 // If we have the trivial case, handle it with no muss and fuss.
2315 if (!isa<llvm::StructType>(ArgI.getCoerceToType()) &&
2316 ArgI.getCoerceToType() == ConvertType(Ty) &&
2317 ArgI.getDirectOffset() == 0) {
2318 assert(NumIRArgs == 1)(static_cast <bool> (NumIRArgs == 1) ? void (0) : __assert_fail
("NumIRArgs == 1", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 2318, __extension__ __PRETTY_FUNCTION__))
;
2319 llvm::Value *V = FnArgs[FirstIRArg];
2320 auto AI = cast<llvm::Argument>(V);
2321
2322 if (const ParmVarDecl *PVD = dyn_cast<ParmVarDecl>(Arg)) {
2323 if (getNonNullAttr(CurCodeDecl, PVD, PVD->getType(),
2324 PVD->getFunctionScopeIndex()))
2325 AI->addAttr(llvm::Attribute::NonNull);
2326
2327 QualType OTy = PVD->getOriginalType();
2328 if (const auto *ArrTy =
2329 getContext().getAsConstantArrayType(OTy)) {
2330 // A C99 array parameter declaration with the static keyword also
2331 // indicates dereferenceability, and if the size is constant we can
2332 // use the dereferenceable attribute (which requires the size in
2333 // bytes).
2334 if (ArrTy->getSizeModifier() == ArrayType::Static) {
2335 QualType ETy = ArrTy->getElementType();
2336 uint64_t ArrSize = ArrTy->getSize().getZExtValue();
2337 if (!ETy->isIncompleteType() && ETy->isConstantSizeType() &&
2338 ArrSize) {
2339 llvm::AttrBuilder Attrs;
2340 Attrs.addDereferenceableAttr(
2341 getContext().getTypeSizeInChars(ETy).getQuantity()*ArrSize);
2342 AI->addAttrs(Attrs);
2343 } else if (getContext().getTargetAddressSpace(ETy) == 0) {
2344 AI->addAttr(llvm::Attribute::NonNull);
2345 }
2346 }
2347 } else if (const auto *ArrTy =
2348 getContext().getAsVariableArrayType(OTy)) {
2349 // For C99 VLAs with the static keyword, we don't know the size so
2350 // we can't use the dereferenceable attribute, but in addrspace(0)
2351 // we know that it must be nonnull.
2352 if (ArrTy->getSizeModifier() == VariableArrayType::Static &&
2353 !getContext().getTargetAddressSpace(ArrTy->getElementType()))
2354 AI->addAttr(llvm::Attribute::NonNull);
2355 }
2356
2357 const auto *AVAttr = PVD->getAttr<AlignValueAttr>();
2358 if (!AVAttr)
2359 if (const auto *TOTy = dyn_cast<TypedefType>(OTy))
2360 AVAttr = TOTy->getDecl()->getAttr<AlignValueAttr>();
2361 if (AVAttr) {
2362 llvm::Value *AlignmentValue =
2363 EmitScalarExpr(AVAttr->getAlignment());
2364 llvm::ConstantInt *AlignmentCI =
2365 cast<llvm::ConstantInt>(AlignmentValue);
2366 unsigned Alignment = std::min((unsigned)AlignmentCI->getZExtValue(),
2367 +llvm::Value::MaximumAlignment);
2368 AI->addAttrs(llvm::AttrBuilder().addAlignmentAttr(Alignment));
2369 }
2370 }
2371
2372 if (Arg->getType().isRestrictQualified())
2373 AI->addAttr(llvm::Attribute::NoAlias);
2374
2375 // LLVM expects swifterror parameters to be used in very restricted
2376 // ways. Copy the value into a less-restricted temporary.
2377 if (FI.getExtParameterInfo(ArgNo).getABI()
2378 == ParameterABI::SwiftErrorResult) {
2379 QualType pointeeTy = Ty->getPointeeType();
2380 assert(pointeeTy->isPointerType())(static_cast <bool> (pointeeTy->isPointerType()) ? void
(0) : __assert_fail ("pointeeTy->isPointerType()", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 2380, __extension__ __PRETTY_FUNCTION__))
;
2381 Address temp =
2382 CreateMemTemp(pointeeTy, getPointerAlign(), "swifterror.temp");
2383 Address arg = Address(V, getContext().getTypeAlignInChars(pointeeTy));
2384 llvm::Value *incomingErrorValue = Builder.CreateLoad(arg);
2385 Builder.CreateStore(incomingErrorValue, temp);
2386 V = temp.getPointer();
2387
2388 // Push a cleanup to copy the value back at the end of the function.
2389 // The convention does not guarantee that the value will be written
2390 // back if the function exits with an unwind exception.
2391 EHStack.pushCleanup<CopyBackSwiftError>(NormalCleanup, temp, arg);
2392 }
2393
2394 // Ensure the argument is the correct type.
2395 if (V->getType() != ArgI.getCoerceToType())
2396 V = Builder.CreateBitCast(V, ArgI.getCoerceToType());
2397
2398 if (isPromoted)
2399 V = emitArgumentDemotion(*this, Arg, V);
2400
2401 // Because of merging of function types from multiple decls it is
2402 // possible for the type of an argument to not match the corresponding
2403 // type in the function type. Since we are codegening the callee
2404 // in here, add a cast to the argument type.
2405 llvm::Type *LTy = ConvertType(Arg->getType());
2406 if (V->getType() != LTy)
2407 V = Builder.CreateBitCast(V, LTy);
2408
2409 ArgVals.push_back(ParamValue::forDirect(V));
2410 break;
2411 }
2412
2413 Address Alloca = CreateMemTemp(Ty, getContext().getDeclAlign(Arg),
2414 Arg->getName());
2415
2416 // Pointer to store into.
2417 Address Ptr = emitAddressAtOffset(*this, Alloca, ArgI);
2418
2419 // Fast-isel and the optimizer generally like scalar values better than
2420 // FCAs, so we flatten them if this is safe to do for this argument.
2421 llvm::StructType *STy = dyn_cast<llvm::StructType>(ArgI.getCoerceToType());
2422 if (ArgI.isDirect() && ArgI.getCanBeFlattened() && STy &&
2423 STy->getNumElements() > 1) {
2424 auto SrcLayout = CGM.getDataLayout().getStructLayout(STy);
2425 uint64_t SrcSize = CGM.getDataLayout().getTypeAllocSize(STy);
2426 llvm::Type *DstTy = Ptr.getElementType();
2427 uint64_t DstSize = CGM.getDataLayout().getTypeAllocSize(DstTy);
2428
2429 Address AddrToStoreInto = Address::invalid();
2430 if (SrcSize <= DstSize) {
2431 AddrToStoreInto = Builder.CreateElementBitCast(Ptr, STy);
2432 } else {
2433 AddrToStoreInto =
2434 CreateTempAlloca(STy, Alloca.getAlignment(), "coerce");
2435 }
2436
2437 assert(STy->getNumElements() == NumIRArgs)(static_cast <bool> (STy->getNumElements() == NumIRArgs
) ? void (0) : __assert_fail ("STy->getNumElements() == NumIRArgs"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 2437, __extension__ __PRETTY_FUNCTION__))
;
2438 for (unsigned i = 0, e = STy->getNumElements(); i != e; ++i) {
2439 auto AI = FnArgs[FirstIRArg + i];
2440 AI->setName(Arg->getName() + ".coerce" + Twine(i));
2441 auto Offset = CharUnits::fromQuantity(SrcLayout->getElementOffset(i));
2442 Address EltPtr =
2443 Builder.CreateStructGEP(AddrToStoreInto, i, Offset);
2444 Builder.CreateStore(AI, EltPtr);
2445 }
2446
2447 if (SrcSize > DstSize) {
2448 Builder.CreateMemCpy(Ptr, AddrToStoreInto, DstSize);
2449 }
2450
2451 } else {
2452 // Simple case, just do a coerced store of the argument into the alloca.
2453 assert(NumIRArgs == 1)(static_cast <bool> (NumIRArgs == 1) ? void (0) : __assert_fail
("NumIRArgs == 1", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 2453, __extension__ __PRETTY_FUNCTION__))
;
2454 auto AI = FnArgs[FirstIRArg];
2455 AI->setName(Arg->getName() + ".coerce");
2456 CreateCoercedStore(AI, Ptr, /*DestIsVolatile=*/false, *this);
2457 }
2458
2459 // Match to what EmitParmDecl is expecting for this type.
2460 if (CodeGenFunction::hasScalarEvaluationKind(Ty)) {
2461 llvm::Value *V =
2462 EmitLoadOfScalar(Alloca, false, Ty, Arg->getLocStart());
2463 if (isPromoted)
2464 V = emitArgumentDemotion(*this, Arg, V);
2465 ArgVals.push_back(ParamValue::forDirect(V));
2466 } else {
2467 ArgVals.push_back(ParamValue::forIndirect(Alloca));
2468 }
2469 break;
2470 }
2471
2472 case ABIArgInfo::CoerceAndExpand: {
2473 // Reconstruct into a temporary.
2474 Address alloca = CreateMemTemp(Ty, getContext().getDeclAlign(Arg));
2475 ArgVals.push_back(ParamValue::forIndirect(alloca));
2476
2477 auto coercionType = ArgI.getCoerceAndExpandType();
2478 alloca = Builder.CreateElementBitCast(alloca, coercionType);
2479 auto layout = CGM.getDataLayout().getStructLayout(coercionType);
2480
2481 unsigned argIndex = FirstIRArg;
2482 for (unsigned i = 0, e = coercionType->getNumElements(); i != e; ++i) {
2483 llvm::Type *eltType = coercionType->getElementType(i);
2484 if (ABIArgInfo::isPaddingForCoerceAndExpand(eltType))
2485 continue;
2486
2487 auto eltAddr = Builder.CreateStructGEP(alloca, i, layout);
2488 auto elt = FnArgs[argIndex++];
2489 Builder.CreateStore(elt, eltAddr);
2490 }
2491 assert(argIndex == FirstIRArg + NumIRArgs)(static_cast <bool> (argIndex == FirstIRArg + NumIRArgs
) ? void (0) : __assert_fail ("argIndex == FirstIRArg + NumIRArgs"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 2491, __extension__ __PRETTY_FUNCTION__))
;
2492 break;
2493 }
2494
2495 case ABIArgInfo::Expand: {
2496 // If this structure was expanded into multiple arguments then
2497 // we need to create a temporary and reconstruct it from the
2498 // arguments.
2499 Address Alloca = CreateMemTemp(Ty, getContext().getDeclAlign(Arg));
2500 LValue LV = MakeAddrLValue(Alloca, Ty);
2501 ArgVals.push_back(ParamValue::forIndirect(Alloca));
2502
2503 auto FnArgIter = FnArgs.begin() + FirstIRArg;
2504 ExpandTypeFromArgs(Ty, LV, FnArgIter);
2505 assert(FnArgIter == FnArgs.begin() + FirstIRArg + NumIRArgs)(static_cast <bool> (FnArgIter == FnArgs.begin() + FirstIRArg
+ NumIRArgs) ? void (0) : __assert_fail ("FnArgIter == FnArgs.begin() + FirstIRArg + NumIRArgs"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 2505, __extension__ __PRETTY_FUNCTION__))
;
2506 for (unsigned i = 0, e = NumIRArgs; i != e; ++i) {
2507 auto AI = FnArgs[FirstIRArg + i];
2508 AI->setName(Arg->getName() + "." + Twine(i));
2509 }
2510 break;
2511 }
2512
2513 case ABIArgInfo::Ignore:
2514 assert(NumIRArgs == 0)(static_cast <bool> (NumIRArgs == 0) ? void (0) : __assert_fail
("NumIRArgs == 0", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 2514, __extension__ __PRETTY_FUNCTION__))
;
2515 // Initialize the local variable appropriately.
2516 if (!hasScalarEvaluationKind(Ty)) {
2517 ArgVals.push_back(ParamValue::forIndirect(CreateMemTemp(Ty)));
2518 } else {
2519 llvm::Value *U = llvm::UndefValue::get(ConvertType(Arg->getType()));
2520 ArgVals.push_back(ParamValue::forDirect(U));
2521 }
2522 break;
2523 }
2524 }
2525
2526 if (getTarget().getCXXABI().areArgsDestroyedLeftToRightInCallee()) {
2527 for (int I = Args.size() - 1; I >= 0; --I)
2528 EmitParmDecl(*Args[I], ArgVals[I], I + 1);
2529 } else {
2530 for (unsigned I = 0, E = Args.size(); I != E; ++I)
2531 EmitParmDecl(*Args[I], ArgVals[I], I + 1);
2532 }
2533}
2534
2535static void eraseUnusedBitCasts(llvm::Instruction *insn) {
2536 while (insn->use_empty()) {
2537 llvm::BitCastInst *bitcast = dyn_cast<llvm::BitCastInst>(insn);
2538 if (!bitcast) return;
2539
2540 // This is "safe" because we would have used a ConstantExpr otherwise.
2541 insn = cast<llvm::Instruction>(bitcast->getOperand(0));
2542 bitcast->eraseFromParent();
2543 }
2544}
2545
2546/// Try to emit a fused autorelease of a return result.
2547static llvm::Value *tryEmitFusedAutoreleaseOfResult(CodeGenFunction &CGF,
2548 llvm::Value *result) {
2549 // We must be immediately followed the cast.
2550 llvm::BasicBlock *BB = CGF.Builder.GetInsertBlock();
2551 if (BB->empty()) return nullptr;
2552 if (&BB->back() != result) return nullptr;
2553
2554 llvm::Type *resultType = result->getType();
2555
2556 // result is in a BasicBlock and is therefore an Instruction.
2557 llvm::Instruction *generator = cast<llvm::Instruction>(result);
2558
2559 SmallVector<llvm::Instruction *, 4> InstsToKill;
2560
2561 // Look for:
2562 // %generator = bitcast %type1* %generator2 to %type2*
2563 while (llvm::BitCastInst *bitcast = dyn_cast<llvm::BitCastInst>(generator)) {
2564 // We would have emitted this as a constant if the operand weren't
2565 // an Instruction.
2566 generator = cast<llvm::Instruction>(bitcast->getOperand(0));
2567
2568 // Require the generator to be immediately followed by the cast.
2569 if (generator->getNextNode() != bitcast)
2570 return nullptr;
2571
2572 InstsToKill.push_back(bitcast);
2573 }
2574
2575 // Look for:
2576 // %generator = call i8* @objc_retain(i8* %originalResult)
2577 // or
2578 // %generator = call i8* @objc_retainAutoreleasedReturnValue(i8* %originalResult)
2579 llvm::CallInst *call = dyn_cast<llvm::CallInst>(generator);
2580 if (!call) return nullptr;
2581
2582 bool doRetainAutorelease;
2583
2584 if (call->getCalledValue() == CGF.CGM.getObjCEntrypoints().objc_retain) {
2585 doRetainAutorelease = true;
2586 } else if (call->getCalledValue() == CGF.CGM.getObjCEntrypoints()
2587 .objc_retainAutoreleasedReturnValue) {
2588 doRetainAutorelease = false;
2589
2590 // If we emitted an assembly marker for this call (and the
2591 // ARCEntrypoints field should have been set if so), go looking
2592 // for that call. If we can't find it, we can't do this
2593 // optimization. But it should always be the immediately previous
2594 // instruction, unless we needed bitcasts around the call.
2595 if (CGF.CGM.getObjCEntrypoints().retainAutoreleasedReturnValueMarker) {
2596 llvm::Instruction *prev = call->getPrevNode();
2597 assert(prev)(static_cast <bool> (prev) ? void (0) : __assert_fail (
"prev", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 2597, __extension__ __PRETTY_FUNCTION__))
;
2598 if (isa<llvm::BitCastInst>(prev)) {
2599 prev = prev->getPrevNode();
2600 assert(prev)(static_cast <bool> (prev) ? void (0) : __assert_fail (
"prev", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 2600, __extension__ __PRETTY_FUNCTION__))
;
2601 }
2602 assert(isa<llvm::CallInst>(prev))(static_cast <bool> (isa<llvm::CallInst>(prev)) ?
void (0) : __assert_fail ("isa<llvm::CallInst>(prev)",
"/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 2602, __extension__ __PRETTY_FUNCTION__))
;
2603 assert(cast<llvm::CallInst>(prev)->getCalledValue() ==(static_cast <bool> (cast<llvm::CallInst>(prev)->
getCalledValue() == CGF.CGM.getObjCEntrypoints().retainAutoreleasedReturnValueMarker
) ? void (0) : __assert_fail ("cast<llvm::CallInst>(prev)->getCalledValue() == CGF.CGM.getObjCEntrypoints().retainAutoreleasedReturnValueMarker"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 2604, __extension__ __PRETTY_FUNCTION__))
2604 CGF.CGM.getObjCEntrypoints().retainAutoreleasedReturnValueMarker)(static_cast <bool> (cast<llvm::CallInst>(prev)->
getCalledValue() == CGF.CGM.getObjCEntrypoints().retainAutoreleasedReturnValueMarker
) ? void (0) : __assert_fail ("cast<llvm::CallInst>(prev)->getCalledValue() == CGF.CGM.getObjCEntrypoints().retainAutoreleasedReturnValueMarker"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 2604, __extension__ __PRETTY_FUNCTION__))
;
2605 InstsToKill.push_back(prev);
2606 }
2607 } else {
2608 return nullptr;
2609 }
2610
2611 result = call->getArgOperand(0);
2612 InstsToKill.push_back(call);
2613
2614 // Keep killing bitcasts, for sanity. Note that we no longer care
2615 // about precise ordering as long as there's exactly one use.
2616 while (llvm::BitCastInst *bitcast = dyn_cast<llvm::BitCastInst>(result)) {
2617 if (!bitcast->hasOneUse()) break;
2618 InstsToKill.push_back(bitcast);
2619 result = bitcast->getOperand(0);
2620 }
2621
2622 // Delete all the unnecessary instructions, from latest to earliest.
2623 for (auto *I : InstsToKill)
2624 I->eraseFromParent();
2625
2626 // Do the fused retain/autorelease if we were asked to.
2627 if (doRetainAutorelease)
2628 result = CGF.EmitARCRetainAutoreleaseReturnValue(result);
2629
2630 // Cast back to the result type.
2631 return CGF.Builder.CreateBitCast(result, resultType);
2632}
2633
2634/// If this is a +1 of the value of an immutable 'self', remove it.
2635static llvm::Value *tryRemoveRetainOfSelf(CodeGenFunction &CGF,
2636 llvm::Value *result) {
2637 // This is only applicable to a method with an immutable 'self'.
2638 const ObjCMethodDecl *method =
2639 dyn_cast_or_null<ObjCMethodDecl>(CGF.CurCodeDecl);
2640 if (!method) return nullptr;
2641 const VarDecl *self = method->getSelfDecl();
2642 if (!self->getType().isConstQualified()) return nullptr;
2643
2644 // Look for a retain call.
2645 llvm::CallInst *retainCall =
2646 dyn_cast<llvm::CallInst>(result->stripPointerCasts());
2647 if (!retainCall ||
2648 retainCall->getCalledValue() != CGF.CGM.getObjCEntrypoints().objc_retain)
2649 return nullptr;
2650
2651 // Look for an ordinary load of 'self'.
2652 llvm::Value *retainedValue = retainCall->getArgOperand(0);
2653 llvm::LoadInst *load =
2654 dyn_cast<llvm::LoadInst>(retainedValue->stripPointerCasts());
2655 if (!load || load->isAtomic() || load->isVolatile() ||
2656 load->getPointerOperand() != CGF.GetAddrOfLocalVar(self).getPointer())
2657 return nullptr;
2658
2659 // Okay! Burn it all down. This relies for correctness on the
2660 // assumption that the retain is emitted as part of the return and
2661 // that thereafter everything is used "linearly".
2662 llvm::Type *resultType = result->getType();
2663 eraseUnusedBitCasts(cast<llvm::Instruction>(result));
2664 assert(retainCall->use_empty())(static_cast <bool> (retainCall->use_empty()) ? void
(0) : __assert_fail ("retainCall->use_empty()", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 2664, __extension__ __PRETTY_FUNCTION__))
;
2665 retainCall->eraseFromParent();
2666 eraseUnusedBitCasts(cast<llvm::Instruction>(retainedValue));
2667
2668 return CGF.Builder.CreateBitCast(load, resultType);
2669}
2670
2671/// Emit an ARC autorelease of the result of a function.
2672///
2673/// \return the value to actually return from the function
2674static llvm::Value *emitAutoreleaseOfResult(CodeGenFunction &CGF,
2675 llvm::Value *result) {
2676 // If we're returning 'self', kill the initial retain. This is a
2677 // heuristic attempt to "encourage correctness" in the really unfortunate
2678 // case where we have a return of self during a dealloc and we desperately
2679 // need to avoid the possible autorelease.
2680 if (llvm::Value *self = tryRemoveRetainOfSelf(CGF, result))
2681 return self;
2682
2683 // At -O0, try to emit a fused retain/autorelease.
2684 if (CGF.shouldUseFusedARCCalls())
2685 if (llvm::Value *fused = tryEmitFusedAutoreleaseOfResult(CGF, result))
2686 return fused;
2687
2688 return CGF.EmitARCAutoreleaseReturnValue(result);
2689}
2690
2691/// Heuristically search for a dominating store to the return-value slot.
2692static llvm::StoreInst *findDominatingStoreToReturnValue(CodeGenFunction &CGF) {
2693 // Check if a User is a store which pointerOperand is the ReturnValue.
2694 // We are looking for stores to the ReturnValue, not for stores of the
2695 // ReturnValue to some other location.
2696 auto GetStoreIfValid = [&CGF](llvm::User *U) -> llvm::StoreInst * {
2697 auto *SI = dyn_cast<llvm::StoreInst>(U);
2698 if (!SI || SI->getPointerOperand() != CGF.ReturnValue.getPointer())
2699 return nullptr;
2700 // These aren't actually possible for non-coerced returns, and we
2701 // only care about non-coerced returns on this code path.
2702 assert(!SI->isAtomic() && !SI->isVolatile())(static_cast <bool> (!SI->isAtomic() && !SI->
isVolatile()) ? void (0) : __assert_fail ("!SI->isAtomic() && !SI->isVolatile()"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 2702, __extension__ __PRETTY_FUNCTION__))
;
2703 return SI;
2704 };
2705 // If there are multiple uses of the return-value slot, just check
2706 // for something immediately preceding the IP. Sometimes this can
2707 // happen with how we generate implicit-returns; it can also happen
2708 // with noreturn cleanups.
2709 if (!CGF.ReturnValue.getPointer()->hasOneUse()) {
2710 llvm::BasicBlock *IP = CGF.Builder.GetInsertBlock();
2711 if (IP->empty()) return nullptr;
2712 llvm::Instruction *I = &IP->back();
2713
2714 // Skip lifetime markers
2715 for (llvm::BasicBlock::reverse_iterator II = IP->rbegin(),
2716 IE = IP->rend();
2717 II != IE; ++II) {
2718 if (llvm::IntrinsicInst *Intrinsic =
2719 dyn_cast<llvm::IntrinsicInst>(&*II)) {
2720 if (Intrinsic->getIntrinsicID() == llvm::Intrinsic::lifetime_end) {
2721 const llvm::Value *CastAddr = Intrinsic->getArgOperand(1);
2722 ++II;
2723 if (II == IE)
2724 break;
2725 if (isa<llvm::BitCastInst>(&*II) && (CastAddr == &*II))
2726 continue;
2727 }
2728 }
2729 I = &*II;
2730 break;
2731 }
2732
2733 return GetStoreIfValid(I);
2734 }
2735
2736 llvm::StoreInst *store =
2737 GetStoreIfValid(CGF.ReturnValue.getPointer()->user_back());
2738 if (!store) return nullptr;
2739
2740 // Now do a first-and-dirty dominance check: just walk up the
2741 // single-predecessors chain from the current insertion point.
2742 llvm::BasicBlock *StoreBB = store->getParent();
2743 llvm::BasicBlock *IP = CGF.Builder.GetInsertBlock();
2744 while (IP != StoreBB) {
2745 if (!(IP = IP->getSinglePredecessor()))
2746 return nullptr;
2747 }
2748
2749 // Okay, the store's basic block dominates the insertion point; we
2750 // can do our thing.
2751 return store;
2752}
2753
2754void CodeGenFunction::EmitFunctionEpilog(const CGFunctionInfo &FI,
2755 bool EmitRetDbgLoc,
2756 SourceLocation EndLoc) {
2757 if (FI.isNoReturn()) {
2758 // Noreturn functions don't return.
2759 EmitUnreachable(EndLoc);
2760 return;
2761 }
2762
2763 if (CurCodeDecl && CurCodeDecl->hasAttr<NakedAttr>()) {
2764 // Naked functions don't have epilogues.
2765 Builder.CreateUnreachable();
2766 return;
2767 }
2768
2769 // Functions with no result always return void.
2770 if (!ReturnValue.isValid()) {
2771 Builder.CreateRetVoid();
2772 return;
2773 }
2774
2775 llvm::DebugLoc RetDbgLoc;
2776 llvm::Value *RV = nullptr;
2777 QualType RetTy = FI.getReturnType();
2778 const ABIArgInfo &RetAI = FI.getReturnInfo();
2779
2780 switch (RetAI.getKind()) {
2781 case ABIArgInfo::InAlloca:
2782 // Aggregrates get evaluated directly into the destination. Sometimes we
2783 // need to return the sret value in a register, though.
2784 assert(hasAggregateEvaluationKind(RetTy))(static_cast <bool> (hasAggregateEvaluationKind(RetTy))
? void (0) : __assert_fail ("hasAggregateEvaluationKind(RetTy)"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 2784, __extension__ __PRETTY_FUNCTION__))
;
2785 if (RetAI.getInAllocaSRet()) {
2786 llvm::Function::arg_iterator EI = CurFn->arg_end();
2787 --EI;
2788 llvm::Value *ArgStruct = &*EI;
2789 llvm::Value *SRet = Builder.CreateStructGEP(
2790 nullptr, ArgStruct, RetAI.getInAllocaFieldIndex());
2791 RV = Builder.CreateAlignedLoad(SRet, getPointerAlign(), "sret");
2792 }
2793 break;
2794
2795 case ABIArgInfo::Indirect: {
2796 auto AI = CurFn->arg_begin();
2797 if (RetAI.isSRetAfterThis())
2798 ++AI;
2799 switch (getEvaluationKind(RetTy)) {
2800 case TEK_Complex: {
2801 ComplexPairTy RT =
2802 EmitLoadOfComplex(MakeAddrLValue(ReturnValue, RetTy), EndLoc);
2803 EmitStoreOfComplex(RT, MakeNaturalAlignAddrLValue(&*AI, RetTy),
2804 /*isInit*/ true);
2805 break;
2806 }
2807 case TEK_Aggregate:
2808 // Do nothing; aggregrates get evaluated directly into the destination.
2809 break;
2810 case TEK_Scalar:
2811 EmitStoreOfScalar(Builder.CreateLoad(ReturnValue),
2812 MakeNaturalAlignAddrLValue(&*AI, RetTy),
2813 /*isInit*/ true);
2814 break;
2815 }
2816 break;
2817 }
2818
2819 case ABIArgInfo::Extend:
2820 case ABIArgInfo::Direct:
2821 if (RetAI.getCoerceToType() == ConvertType(RetTy) &&
2822 RetAI.getDirectOffset() == 0) {
2823 // The internal return value temp always will have pointer-to-return-type
2824 // type, just do a load.
2825
2826 // If there is a dominating store to ReturnValue, we can elide
2827 // the load, zap the store, and usually zap the alloca.
2828 if (llvm::StoreInst *SI =
2829 findDominatingStoreToReturnValue(*this)) {
2830 // Reuse the debug location from the store unless there is
2831 // cleanup code to be emitted between the store and return
2832 // instruction.
2833 if (EmitRetDbgLoc && !AutoreleaseResult)
2834 RetDbgLoc = SI->getDebugLoc();
2835 // Get the stored value and nuke the now-dead store.
2836 RV = SI->getValueOperand();
2837 SI->eraseFromParent();
2838
2839 // If that was the only use of the return value, nuke it as well now.
2840 auto returnValueInst = ReturnValue.getPointer();
2841 if (returnValueInst->use_empty()) {
2842 if (auto alloca = dyn_cast<llvm::AllocaInst>(returnValueInst)) {
2843 alloca->eraseFromParent();
2844 ReturnValue = Address::invalid();
2845 }
2846 }
2847
2848 // Otherwise, we have to do a simple load.
2849 } else {
2850 RV = Builder.CreateLoad(ReturnValue);
2851 }
2852 } else {
2853 // If the value is offset in memory, apply the offset now.
2854 Address V = emitAddressAtOffset(*this, ReturnValue, RetAI);
2855
2856 RV = CreateCoercedLoad(V, RetAI.getCoerceToType(), *this);
2857 }
2858
2859 // In ARC, end functions that return a retainable type with a call
2860 // to objc_autoreleaseReturnValue.
2861 if (AutoreleaseResult) {
2862#ifndef NDEBUG
2863 // Type::isObjCRetainabletype has to be called on a QualType that hasn't
2864 // been stripped of the typedefs, so we cannot use RetTy here. Get the
2865 // original return type of FunctionDecl, CurCodeDecl, and BlockDecl from
2866 // CurCodeDecl or BlockInfo.
2867 QualType RT;
2868
2869 if (auto *FD = dyn_cast<FunctionDecl>(CurCodeDecl))
2870 RT = FD->getReturnType();
2871 else if (auto *MD = dyn_cast<ObjCMethodDecl>(CurCodeDecl))
2872 RT = MD->getReturnType();
2873 else if (isa<BlockDecl>(CurCodeDecl))
2874 RT = BlockInfo->BlockExpression->getFunctionType()->getReturnType();
2875 else
2876 llvm_unreachable("Unexpected function/method type")::llvm::llvm_unreachable_internal("Unexpected function/method type"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 2876)
;
2877
2878 assert(getLangOpts().ObjCAutoRefCount &&(static_cast <bool> (getLangOpts().ObjCAutoRefCount &&
!FI.isReturnsRetained() && RT->isObjCRetainableType
()) ? void (0) : __assert_fail ("getLangOpts().ObjCAutoRefCount && !FI.isReturnsRetained() && RT->isObjCRetainableType()"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 2880, __extension__ __PRETTY_FUNCTION__))
2879 !FI.isReturnsRetained() &&(static_cast <bool> (getLangOpts().ObjCAutoRefCount &&
!FI.isReturnsRetained() && RT->isObjCRetainableType
()) ? void (0) : __assert_fail ("getLangOpts().ObjCAutoRefCount && !FI.isReturnsRetained() && RT->isObjCRetainableType()"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 2880, __extension__ __PRETTY_FUNCTION__))
2880 RT->isObjCRetainableType())(static_cast <bool> (getLangOpts().ObjCAutoRefCount &&
!FI.isReturnsRetained() && RT->isObjCRetainableType
()) ? void (0) : __assert_fail ("getLangOpts().ObjCAutoRefCount && !FI.isReturnsRetained() && RT->isObjCRetainableType()"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 2880, __extension__ __PRETTY_FUNCTION__))
;
2881#endif
2882 RV = emitAutoreleaseOfResult(*this, RV);
2883 }
2884
2885 break;
2886
2887 case ABIArgInfo::Ignore:
2888 break;
2889
2890 case ABIArgInfo::CoerceAndExpand: {
2891 auto coercionType = RetAI.getCoerceAndExpandType();
2892 auto layout = CGM.getDataLayout().getStructLayout(coercionType);
2893
2894 // Load all of the coerced elements out into results.
2895 llvm::SmallVector<llvm::Value*, 4> results;
2896 Address addr = Builder.CreateElementBitCast(ReturnValue, coercionType);
2897 for (unsigned i = 0, e = coercionType->getNumElements(); i != e; ++i) {
2898 auto coercedEltType = coercionType->getElementType(i);
2899 if (ABIArgInfo::isPaddingForCoerceAndExpand(coercedEltType))
2900 continue;
2901
2902 auto eltAddr = Builder.CreateStructGEP(addr, i, layout);
2903 auto elt = Builder.CreateLoad(eltAddr);
2904 results.push_back(elt);
2905 }
2906
2907 // If we have one result, it's the single direct result type.
2908 if (results.size() == 1) {
2909 RV = results[0];
2910
2911 // Otherwise, we need to make a first-class aggregate.
2912 } else {
2913 // Construct a return type that lacks padding elements.
2914 llvm::Type *returnType = RetAI.getUnpaddedCoerceAndExpandType();
2915
2916 RV = llvm::UndefValue::get(returnType);
2917 for (unsigned i = 0, e = results.size(); i != e; ++i) {
2918 RV = Builder.CreateInsertValue(RV, results[i], i);
2919 }
2920 }
2921 break;
2922 }
2923
2924 case ABIArgInfo::Expand:
2925 llvm_unreachable("Invalid ABI kind for return argument")::llvm::llvm_unreachable_internal("Invalid ABI kind for return argument"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 2925)
;
2926 }
2927
2928 llvm::Instruction *Ret;
2929 if (RV) {
2930 EmitReturnValueCheck(RV);
2931 Ret = Builder.CreateRet(RV);
2932 } else {
2933 Ret = Builder.CreateRetVoid();
2934 }
2935
2936 if (RetDbgLoc)
2937 Ret->setDebugLoc(std::move(RetDbgLoc));
2938}
2939
2940void CodeGenFunction::EmitReturnValueCheck(llvm::Value *RV) {
2941 // A current decl may not be available when emitting vtable thunks.
2942 if (!CurCodeDecl)
2943 return;
2944
2945 ReturnsNonNullAttr *RetNNAttr = nullptr;
2946 if (SanOpts.has(SanitizerKind::ReturnsNonnullAttribute))
2947 RetNNAttr = CurCodeDecl->getAttr<ReturnsNonNullAttr>();
2948
2949 if (!RetNNAttr && !requiresReturnValueNullabilityCheck())
2950 return;
2951
2952 // Prefer the returns_nonnull attribute if it's present.
2953 SourceLocation AttrLoc;
2954 SanitizerMask CheckKind;
2955 SanitizerHandler Handler;
2956 if (RetNNAttr) {
2957 assert(!requiresReturnValueNullabilityCheck() &&(static_cast <bool> (!requiresReturnValueNullabilityCheck
() && "Cannot check nullability and the nonnull attribute"
) ? void (0) : __assert_fail ("!requiresReturnValueNullabilityCheck() && \"Cannot check nullability and the nonnull attribute\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 2958, __extension__ __PRETTY_FUNCTION__))
2958 "Cannot check nullability and the nonnull attribute")(static_cast <bool> (!requiresReturnValueNullabilityCheck
() && "Cannot check nullability and the nonnull attribute"
) ? void (0) : __assert_fail ("!requiresReturnValueNullabilityCheck() && \"Cannot check nullability and the nonnull attribute\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 2958, __extension__ __PRETTY_FUNCTION__))
;
2959 AttrLoc = RetNNAttr->getLocation();
2960 CheckKind = SanitizerKind::ReturnsNonnullAttribute;
2961 Handler = SanitizerHandler::NonnullReturn;
2962 } else {
2963 if (auto *DD = dyn_cast<DeclaratorDecl>(CurCodeDecl))
2964 if (auto *TSI = DD->getTypeSourceInfo())
2965 if (auto FTL = TSI->getTypeLoc().castAs<FunctionTypeLoc>())
2966 AttrLoc = FTL.getReturnLoc().findNullabilityLoc();
2967 CheckKind = SanitizerKind::NullabilityReturn;
2968 Handler = SanitizerHandler::NullabilityReturn;
2969 }
2970
2971 SanitizerScope SanScope(this);
2972
2973 // Make sure the "return" source location is valid. If we're checking a
2974 // nullability annotation, make sure the preconditions for the check are met.
2975 llvm::BasicBlock *Check = createBasicBlock("nullcheck");
2976 llvm::BasicBlock *NoCheck = createBasicBlock("no.nullcheck");
2977 llvm::Value *SLocPtr = Builder.CreateLoad(ReturnLocation, "return.sloc.load");
2978 llvm::Value *CanNullCheck = Builder.CreateIsNotNull(SLocPtr);
2979 if (requiresReturnValueNullabilityCheck())
2980 CanNullCheck =
2981 Builder.CreateAnd(CanNullCheck, RetValNullabilityPrecondition);
2982 Builder.CreateCondBr(CanNullCheck, Check, NoCheck);
2983 EmitBlock(Check);
2984
2985 // Now do the null check.
2986 llvm::Value *Cond = Builder.CreateIsNotNull(RV);
2987 llvm::Constant *StaticData[] = {EmitCheckSourceLocation(AttrLoc)};
2988 llvm::Value *DynamicData[] = {SLocPtr};
2989 EmitCheck(std::make_pair(Cond, CheckKind), Handler, StaticData, DynamicData);
2990
2991 EmitBlock(NoCheck);
2992
2993#ifndef NDEBUG
2994 // The return location should not be used after the check has been emitted.
2995 ReturnLocation = Address::invalid();
2996#endif
2997}
2998
2999static bool isInAllocaArgument(CGCXXABI &ABI, QualType type) {
3000 const CXXRecordDecl *RD = type->getAsCXXRecordDecl();
3001 return RD && ABI.getRecordArgABI(RD) == CGCXXABI::RAA_DirectInMemory;
3002}
3003
3004static AggValueSlot createPlaceholderSlot(CodeGenFunction &CGF,
3005 QualType Ty) {
3006 // FIXME: Generate IR in one pass, rather than going back and fixing up these
3007 // placeholders.
3008 llvm::Type *IRTy = CGF.ConvertTypeForMem(Ty);
3009 llvm::Type *IRPtrTy = IRTy->getPointerTo();
3010 llvm::Value *Placeholder = llvm::UndefValue::get(IRPtrTy->getPointerTo());
3011
3012 // FIXME: When we generate this IR in one pass, we shouldn't need
3013 // this win32-specific alignment hack.
3014 CharUnits Align = CharUnits::fromQuantity(4);
3015 Placeholder = CGF.Builder.CreateAlignedLoad(IRPtrTy, Placeholder, Align);
3016
3017 return AggValueSlot::forAddr(Address(Placeholder, Align),
3018 Ty.getQualifiers(),
3019 AggValueSlot::IsNotDestructed,
3020 AggValueSlot::DoesNotNeedGCBarriers,
3021 AggValueSlot::IsNotAliased,
3022 AggValueSlot::DoesNotOverlap);
3023}
3024
3025void CodeGenFunction::EmitDelegateCallArg(CallArgList &args,
3026 const VarDecl *param,
3027 SourceLocation loc) {
3028 // StartFunction converted the ABI-lowered parameter(s) into a
3029 // local alloca. We need to turn that into an r-value suitable
3030 // for EmitCall.
3031 Address local = GetAddrOfLocalVar(param);
3032
3033 QualType type = param->getType();
3034
3035 assert(!isInAllocaArgument(CGM.getCXXABI(), type) &&(static_cast <bool> (!isInAllocaArgument(CGM.getCXXABI(
), type) && "cannot emit delegate call arguments for inalloca arguments!"
) ? void (0) : __assert_fail ("!isInAllocaArgument(CGM.getCXXABI(), type) && \"cannot emit delegate call arguments for inalloca arguments!\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 3036, __extension__ __PRETTY_FUNCTION__))
3036 "cannot emit delegate call arguments for inalloca arguments!")(static_cast <bool> (!isInAllocaArgument(CGM.getCXXABI(
), type) && "cannot emit delegate call arguments for inalloca arguments!"
) ? void (0) : __assert_fail ("!isInAllocaArgument(CGM.getCXXABI(), type) && \"cannot emit delegate call arguments for inalloca arguments!\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 3036, __extension__ __PRETTY_FUNCTION__))
;
3037
3038 // GetAddrOfLocalVar returns a pointer-to-pointer for references,
3039 // but the argument needs to be the original pointer.
3040 if (type->isReferenceType()) {
3041 args.add(RValue::get(Builder.CreateLoad(local)), type);
3042
3043 // In ARC, move out of consumed arguments so that the release cleanup
3044 // entered by StartFunction doesn't cause an over-release. This isn't
3045 // optimal -O0 code generation, but it should get cleaned up when
3046 // optimization is enabled. This also assumes that delegate calls are
3047 // performed exactly once for a set of arguments, but that should be safe.
3048 } else if (getLangOpts().ObjCAutoRefCount &&
3049 param->hasAttr<NSConsumedAttr>() &&
3050 type->isObjCRetainableType()) {
3051 llvm::Value *ptr = Builder.CreateLoad(local);
3052 auto null =
3053 llvm::ConstantPointerNull::get(cast<llvm::PointerType>(ptr->getType()));
3054 Builder.CreateStore(null, local);
3055 args.add(RValue::get(ptr), type);
3056
3057 // For the most part, we just need to load the alloca, except that
3058 // aggregate r-values are actually pointers to temporaries.
3059 } else {
3060 args.add(convertTempToRValue(local, type, loc), type);
3061 }
3062}
3063
3064static bool isProvablyNull(llvm::Value *addr) {
3065 return isa<llvm::ConstantPointerNull>(addr);
3066}
3067
3068/// Emit the actual writing-back of a writeback.
3069static void emitWriteback(CodeGenFunction &CGF,
3070 const CallArgList::Writeback &writeback) {
3071 const LValue &srcLV = writeback.Source;
3072 Address srcAddr = srcLV.getAddress();
3073 assert(!isProvablyNull(srcAddr.getPointer()) &&(static_cast <bool> (!isProvablyNull(srcAddr.getPointer
()) && "shouldn't have writeback for provably null argument"
) ? void (0) : __assert_fail ("!isProvablyNull(srcAddr.getPointer()) && \"shouldn't have writeback for provably null argument\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 3074, __extension__ __PRETTY_FUNCTION__))
3074 "shouldn't have writeback for provably null argument")(static_cast <bool> (!isProvablyNull(srcAddr.getPointer
()) && "shouldn't have writeback for provably null argument"
) ? void (0) : __assert_fail ("!isProvablyNull(srcAddr.getPointer()) && \"shouldn't have writeback for provably null argument\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 3074, __extension__ __PRETTY_FUNCTION__))
;
3075
3076 llvm::BasicBlock *contBB = nullptr;
3077
3078 // If the argument wasn't provably non-null, we need to null check
3079 // before doing the store.
3080 bool provablyNonNull = llvm::isKnownNonZero(srcAddr.getPointer(),
3081 CGF.CGM.getDataLayout());
3082 if (!provablyNonNull) {
3083 llvm::BasicBlock *writebackBB = CGF.createBasicBlock("icr.writeback");
3084 contBB = CGF.createBasicBlock("icr.done");
3085
3086 llvm::Value *isNull =
3087 CGF.Builder.CreateIsNull(srcAddr.getPointer(), "icr.isnull");
3088 CGF.Builder.CreateCondBr(isNull, contBB, writebackBB);
3089 CGF.EmitBlock(writebackBB);
3090 }
3091
3092 // Load the value to writeback.
3093 llvm::Value *value = CGF.Builder.CreateLoad(writeback.Temporary);
3094
3095 // Cast it back, in case we're writing an id to a Foo* or something.
3096 value = CGF.Builder.CreateBitCast(value, srcAddr.getElementType(),
3097 "icr.writeback-cast");
3098
3099 // Perform the writeback.
3100
3101 // If we have a "to use" value, it's something we need to emit a use
3102 // of. This has to be carefully threaded in: if it's done after the
3103 // release it's potentially undefined behavior (and the optimizer
3104 // will ignore it), and if it happens before the retain then the
3105 // optimizer could move the release there.
3106 if (writeback.ToUse) {
3107 assert(srcLV.getObjCLifetime() == Qualifiers::OCL_Strong)(static_cast <bool> (srcLV.getObjCLifetime() == Qualifiers
::OCL_Strong) ? void (0) : __assert_fail ("srcLV.getObjCLifetime() == Qualifiers::OCL_Strong"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 3107, __extension__ __PRETTY_FUNCTION__))
;
3108
3109 // Retain the new value. No need to block-copy here: the block's
3110 // being passed up the stack.
3111 value = CGF.EmitARCRetainNonBlock(value);
3112
3113 // Emit the intrinsic use here.
3114 CGF.EmitARCIntrinsicUse(writeback.ToUse);
3115
3116 // Load the old value (primitively).
3117 llvm::Value *oldValue = CGF.EmitLoadOfScalar(srcLV, SourceLocation());
3118
3119 // Put the new value in place (primitively).
3120 CGF.EmitStoreOfScalar(value, srcLV, /*init*/ false);
3121
3122 // Release the old value.
3123 CGF.EmitARCRelease(oldValue, srcLV.isARCPreciseLifetime());
3124
3125 // Otherwise, we can just do a normal lvalue store.
3126 } else {
3127 CGF.EmitStoreThroughLValue(RValue::get(value), srcLV);
3128 }
3129
3130 // Jump to the continuation block.
3131 if (!provablyNonNull)
3132 CGF.EmitBlock(contBB);
3133}
3134
3135static void emitWritebacks(CodeGenFunction &CGF,
3136 const CallArgList &args) {
3137 for (const auto &I : args.writebacks())
3138 emitWriteback(CGF, I);
3139}
3140
3141static void deactivateArgCleanupsBeforeCall(CodeGenFunction &CGF,
3142 const CallArgList &CallArgs) {
3143 ArrayRef<CallArgList::CallArgCleanup> Cleanups =
3144 CallArgs.getCleanupsToDeactivate();
3145 // Iterate in reverse to increase the likelihood of popping the cleanup.
3146 for (const auto &I : llvm::reverse(Cleanups)) {
3147 CGF.DeactivateCleanupBlock(I.Cleanup, I.IsActiveIP);
3148 I.IsActiveIP->eraseFromParent();
3149 }
3150}
3151
3152static const Expr *maybeGetUnaryAddrOfOperand(const Expr *E) {
3153 if (const UnaryOperator *uop = dyn_cast<UnaryOperator>(E->IgnoreParens()))
3154 if (uop->getOpcode() == UO_AddrOf)
3155 return uop->getSubExpr();
3156 return nullptr;
3157}
3158
3159/// Emit an argument that's being passed call-by-writeback. That is,
3160/// we are passing the address of an __autoreleased temporary; it
3161/// might be copy-initialized with the current value of the given
3162/// address, but it will definitely be copied out of after the call.
3163static void emitWritebackArg(CodeGenFunction &CGF, CallArgList &args,
3164 const ObjCIndirectCopyRestoreExpr *CRE) {
3165 LValue srcLV;
3166
3167 // Make an optimistic effort to emit the address as an l-value.
3168 // This can fail if the argument expression is more complicated.
3169 if (const Expr *lvExpr = maybeGetUnaryAddrOfOperand(CRE->getSubExpr())) {
3170 srcLV = CGF.EmitLValue(lvExpr);
3171
3172 // Otherwise, just emit it as a scalar.
3173 } else {
3174 Address srcAddr = CGF.EmitPointerWithAlignment(CRE->getSubExpr());
3175
3176 QualType srcAddrType =
3177 CRE->getSubExpr()->getType()->castAs<PointerType>()->getPointeeType();
3178 srcLV = CGF.MakeAddrLValue(srcAddr, srcAddrType);
3179 }
3180 Address srcAddr = srcLV.getAddress();
3181
3182 // The dest and src types don't necessarily match in LLVM terms
3183 // because of the crazy ObjC compatibility rules.
3184
3185 llvm::PointerType *destType =
3186 cast<llvm::PointerType>(CGF.ConvertType(CRE->getType()));
3187
3188 // If the address is a constant null, just pass the appropriate null.
3189 if (isProvablyNull(srcAddr.getPointer())) {
3190 args.add(RValue::get(llvm::ConstantPointerNull::get(destType)),
3191 CRE->getType());
3192 return;
3193 }
3194
3195 // Create the temporary.
3196 Address temp = CGF.CreateTempAlloca(destType->getElementType(),
3197 CGF.getPointerAlign(),
3198 "icr.temp");
3199 // Loading an l-value can introduce a cleanup if the l-value is __weak,
3200 // and that cleanup will be conditional if we can't prove that the l-value
3201 // isn't null, so we need to register a dominating point so that the cleanups
3202 // system will make valid IR.
3203 CodeGenFunction::ConditionalEvaluation condEval(CGF);
3204
3205 // Zero-initialize it if we're not doing a copy-initialization.
3206 bool shouldCopy = CRE->shouldCopy();
3207 if (!shouldCopy) {
3208 llvm::Value *null =
3209 llvm::ConstantPointerNull::get(
3210 cast<llvm::PointerType>(destType->getElementType()));
3211 CGF.Builder.CreateStore(null, temp);
3212 }
3213
3214 llvm::BasicBlock *contBB = nullptr;
3215 llvm::BasicBlock *originBB = nullptr;
3216
3217 // If the address is *not* known to be non-null, we need to switch.
3218 llvm::Value *finalArgument;
3219
3220 bool provablyNonNull = llvm::isKnownNonZero(srcAddr.getPointer(),
3221 CGF.CGM.getDataLayout());
3222 if (provablyNonNull) {
3223 finalArgument = temp.getPointer();
3224 } else {
3225 llvm::Value *isNull =
3226 CGF.Builder.CreateIsNull(srcAddr.getPointer(), "icr.isnull");
3227
3228 finalArgument = CGF.Builder.CreateSelect(isNull,
3229 llvm::ConstantPointerNull::get(destType),
3230 temp.getPointer(), "icr.argument");
3231
3232 // If we need to copy, then the load has to be conditional, which
3233 // means we need control flow.
3234 if (shouldCopy) {
3235 originBB = CGF.Builder.GetInsertBlock();
3236 contBB = CGF.createBasicBlock("icr.cont");
3237 llvm::BasicBlock *copyBB = CGF.createBasicBlock("icr.copy");
3238 CGF.Builder.CreateCondBr(isNull, contBB, copyBB);
3239 CGF.EmitBlock(copyBB);
3240 condEval.begin(CGF);
3241 }
3242 }
3243
3244 llvm::Value *valueToUse = nullptr;
3245
3246 // Perform a copy if necessary.
3247 if (shouldCopy) {
3248 RValue srcRV = CGF.EmitLoadOfLValue(srcLV, SourceLocation());
3249 assert(srcRV.isScalar())(static_cast <bool> (srcRV.isScalar()) ? void (0) : __assert_fail
("srcRV.isScalar()", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 3249, __extension__ __PRETTY_FUNCTION__))
;
3250
3251 llvm::Value *src = srcRV.getScalarVal();
3252 src = CGF.Builder.CreateBitCast(src, destType->getElementType(),
3253 "icr.cast");
3254
3255 // Use an ordinary store, not a store-to-lvalue.
3256 CGF.Builder.CreateStore(src, temp);
3257
3258 // If optimization is enabled, and the value was held in a
3259 // __strong variable, we need to tell the optimizer that this
3260 // value has to stay alive until we're doing the store back.
3261 // This is because the temporary is effectively unretained,
3262 // and so otherwise we can violate the high-level semantics.
3263 if (CGF.CGM.getCodeGenOpts().OptimizationLevel != 0 &&
3264 srcLV.getObjCLifetime() == Qualifiers::OCL_Strong) {
3265 valueToUse = src;
3266 }
3267 }
3268
3269 // Finish the control flow if we needed it.
3270 if (shouldCopy && !provablyNonNull) {
3271 llvm::BasicBlock *copyBB = CGF.Builder.GetInsertBlock();
3272 CGF.EmitBlock(contBB);
3273
3274 // Make a phi for the value to intrinsically use.
3275 if (valueToUse) {
3276 llvm::PHINode *phiToUse = CGF.Builder.CreatePHI(valueToUse->getType(), 2,
3277 "icr.to-use");
3278 phiToUse->addIncoming(valueToUse, copyBB);
3279 phiToUse->addIncoming(llvm::UndefValue::get(valueToUse->getType()),
3280 originBB);
3281 valueToUse = phiToUse;
3282 }
3283
3284 condEval.end(CGF);
3285 }
3286
3287 args.addWriteback(srcLV, temp, valueToUse);
3288 args.add(RValue::get(finalArgument), CRE->getType());
3289}
3290
3291void CallArgList::allocateArgumentMemory(CodeGenFunction &CGF) {
3292 assert(!StackBase)(static_cast <bool> (!StackBase) ? void (0) : __assert_fail
("!StackBase", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 3292, __extension__ __PRETTY_FUNCTION__))
;
3293
3294 // Save the stack.
3295 llvm::Function *F = CGF.CGM.getIntrinsic(llvm::Intrinsic::stacksave);
3296 StackBase = CGF.Builder.CreateCall(F, {}, "inalloca.save");
3297}
3298
3299void CallArgList::freeArgumentMemory(CodeGenFunction &CGF) const {
3300 if (StackBase) {
3301 // Restore the stack after the call.
3302 llvm::Value *F = CGF.CGM.getIntrinsic(llvm::Intrinsic::stackrestore);
3303 CGF.Builder.CreateCall(F, StackBase);
3304 }
3305}
3306
3307void CodeGenFunction::EmitNonNullArgCheck(RValue RV, QualType ArgType,
3308 SourceLocation ArgLoc,
3309 AbstractCallee AC,
3310 unsigned ParmNum) {
3311 if (!AC.getDecl() || !(SanOpts.has(SanitizerKind::NonnullAttribute) ||
3312 SanOpts.has(SanitizerKind::NullabilityArg)))
3313 return;
3314
3315 // The param decl may be missing in a variadic function.
3316 auto PVD = ParmNum < AC.getNumParams() ? AC.getParamDecl(ParmNum) : nullptr;
3317 unsigned ArgNo = PVD ? PVD->getFunctionScopeIndex() : ParmNum;
3318
3319 // Prefer the nonnull attribute if it's present.
3320 const NonNullAttr *NNAttr = nullptr;
3321 if (SanOpts.has(SanitizerKind::NonnullAttribute))
3322 NNAttr = getNonNullAttr(AC.getDecl(), PVD, ArgType, ArgNo);
3323
3324 bool CanCheckNullability = false;
3325 if (SanOpts.has(SanitizerKind::NullabilityArg) && !NNAttr && PVD) {
3326 auto Nullability = PVD->getType()->getNullability(getContext());
3327 CanCheckNullability = Nullability &&
3328 *Nullability == NullabilityKind::NonNull &&
3329 PVD->getTypeSourceInfo();
3330 }
3331
3332 if (!NNAttr && !CanCheckNullability)
3333 return;
3334
3335 SourceLocation AttrLoc;
3336 SanitizerMask CheckKind;
3337 SanitizerHandler Handler;
3338 if (NNAttr) {
3339 AttrLoc = NNAttr->getLocation();
3340 CheckKind = SanitizerKind::NonnullAttribute;
3341 Handler = SanitizerHandler::NonnullArg;
3342 } else {
3343 AttrLoc = PVD->getTypeSourceInfo()->getTypeLoc().findNullabilityLoc();
3344 CheckKind = SanitizerKind::NullabilityArg;
3345 Handler = SanitizerHandler::NullabilityArg;
3346 }
3347
3348 SanitizerScope SanScope(this);
3349 assert(RV.isScalar())(static_cast <bool> (RV.isScalar()) ? void (0) : __assert_fail
("RV.isScalar()", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 3349, __extension__ __PRETTY_FUNCTION__))
;
3350 llvm::Value *V = RV.getScalarVal();
3351 llvm::Value *Cond =
3352 Builder.CreateICmpNE(V, llvm::Constant::getNullValue(V->getType()));
3353 llvm::Constant *StaticData[] = {
3354 EmitCheckSourceLocation(ArgLoc), EmitCheckSourceLocation(AttrLoc),
3355 llvm::ConstantInt::get(Int32Ty, ArgNo + 1),
3356 };
3357 EmitCheck(std::make_pair(Cond, CheckKind), Handler, StaticData, None);
3358}
3359
3360void CodeGenFunction::EmitCallArgs(
3361 CallArgList &Args, ArrayRef<QualType> ArgTypes,
3362 llvm::iterator_range<CallExpr::const_arg_iterator> ArgRange,
3363 AbstractCallee AC, unsigned ParamsToSkip, EvaluationOrder Order) {
3364 assert((int)ArgTypes.size() == (ArgRange.end() - ArgRange.begin()))(static_cast <bool> ((int)ArgTypes.size() == (ArgRange.
end() - ArgRange.begin())) ? void (0) : __assert_fail ("(int)ArgTypes.size() == (ArgRange.end() - ArgRange.begin())"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 3364, __extension__ __PRETTY_FUNCTION__))
;
3365
3366 // We *have* to evaluate arguments from right to left in the MS C++ ABI,
3367 // because arguments are destroyed left to right in the callee. As a special
3368 // case, there are certain language constructs that require left-to-right
3369 // evaluation, and in those cases we consider the evaluation order requirement
3370 // to trump the "destruction order is reverse construction order" guarantee.
3371 bool LeftToRight =
3372 CGM.getTarget().getCXXABI().areArgsDestroyedLeftToRightInCallee()
3373 ? Order == EvaluationOrder::ForceLeftToRight
3374 : Order != EvaluationOrder::ForceRightToLeft;
3375
3376 auto MaybeEmitImplicitObjectSize = [&](unsigned I, const Expr *Arg,
3377 RValue EmittedArg) {
3378 if (!AC.hasFunctionDecl() || I >= AC.getNumParams())
3379 return;
3380 auto *PS = AC.getParamDecl(I)->getAttr<PassObjectSizeAttr>();
3381 if (PS == nullptr)
3382 return;
3383
3384 const auto &Context = getContext();
3385 auto SizeTy = Context.getSizeType();
3386 auto T = Builder.getIntNTy(Context.getTypeSize(SizeTy));
3387 assert(EmittedArg.getScalarVal() && "We emitted nothing for the arg?")(static_cast <bool> (EmittedArg.getScalarVal() &&
"We emitted nothing for the arg?") ? void (0) : __assert_fail
("EmittedArg.getScalarVal() && \"We emitted nothing for the arg?\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 3387, __extension__ __PRETTY_FUNCTION__))
;
3388 llvm::Value *V = evaluateOrEmitBuiltinObjectSize(Arg, PS->getType(), T,
3389 EmittedArg.getScalarVal());
3390 Args.add(RValue::get(V), SizeTy);
3391 // If we're emitting args in reverse, be sure to do so with
3392 // pass_object_size, as well.
3393 if (!LeftToRight)
3394 std::swap(Args.back(), *(&Args.back() - 1));
3395 };
3396
3397 // Insert a stack save if we're going to need any inalloca args.
3398 bool HasInAllocaArgs = false;
3399 if (CGM.getTarget().getCXXABI().isMicrosoft()) {
3400 for (ArrayRef<QualType>::iterator I = ArgTypes.begin(), E = ArgTypes.end();
3401 I != E && !HasInAllocaArgs; ++I)
3402 HasInAllocaArgs = isInAllocaArgument(CGM.getCXXABI(), *I);
3403 if (HasInAllocaArgs) {
3404 assert(getTarget().getTriple().getArch() == llvm::Triple::x86)(static_cast <bool> (getTarget().getTriple().getArch() ==
llvm::Triple::x86) ? void (0) : __assert_fail ("getTarget().getTriple().getArch() == llvm::Triple::x86"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 3404, __extension__ __PRETTY_FUNCTION__))
;
3405 Args.allocateArgumentMemory(*this);
3406 }
3407 }
3408
3409 // Evaluate each argument in the appropriate order.
3410 size_t CallArgsStart = Args.size();
3411 for (unsigned I = 0, E = ArgTypes.size(); I != E; ++I) {
3412 unsigned Idx = LeftToRight ? I : E - I - 1;
3413 CallExpr::const_arg_iterator Arg = ArgRange.begin() + Idx;
3414 unsigned InitialArgSize = Args.size();
3415 // If *Arg is an ObjCIndirectCopyRestoreExpr, check that either the types of
3416 // the argument and parameter match or the objc method is parameterized.
3417 assert((!isa<ObjCIndirectCopyRestoreExpr>(*Arg) ||(static_cast <bool> ((!isa<ObjCIndirectCopyRestoreExpr
>(*Arg) || getContext().hasSameUnqualifiedType((*Arg)->
getType(), ArgTypes[Idx]) || (isa<ObjCMethodDecl>(AC.getDecl
()) && isObjCMethodWithTypeParams(cast<ObjCMethodDecl
>(AC.getDecl())))) && "Argument and parameter types don't match"
) ? void (0) : __assert_fail ("(!isa<ObjCIndirectCopyRestoreExpr>(*Arg) || getContext().hasSameUnqualifiedType((*Arg)->getType(), ArgTypes[Idx]) || (isa<ObjCMethodDecl>(AC.getDecl()) && isObjCMethodWithTypeParams(cast<ObjCMethodDecl>(AC.getDecl())))) && \"Argument and parameter types don't match\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 3422, __extension__ __PRETTY_FUNCTION__))
3418 getContext().hasSameUnqualifiedType((*Arg)->getType(),(static_cast <bool> ((!isa<ObjCIndirectCopyRestoreExpr
>(*Arg) || getContext().hasSameUnqualifiedType((*Arg)->
getType(), ArgTypes[Idx]) || (isa<ObjCMethodDecl>(AC.getDecl
()) && isObjCMethodWithTypeParams(cast<ObjCMethodDecl
>(AC.getDecl())))) && "Argument and parameter types don't match"
) ? void (0) : __assert_fail ("(!isa<ObjCIndirectCopyRestoreExpr>(*Arg) || getContext().hasSameUnqualifiedType((*Arg)->getType(), ArgTypes[Idx]) || (isa<ObjCMethodDecl>(AC.getDecl()) && isObjCMethodWithTypeParams(cast<ObjCMethodDecl>(AC.getDecl())))) && \"Argument and parameter types don't match\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 3422, __extension__ __PRETTY_FUNCTION__))
3419 ArgTypes[Idx]) ||(static_cast <bool> ((!isa<ObjCIndirectCopyRestoreExpr
>(*Arg) || getContext().hasSameUnqualifiedType((*Arg)->
getType(), ArgTypes[Idx]) || (isa<ObjCMethodDecl>(AC.getDecl
()) && isObjCMethodWithTypeParams(cast<ObjCMethodDecl
>(AC.getDecl())))) && "Argument and parameter types don't match"
) ? void (0) : __assert_fail ("(!isa<ObjCIndirectCopyRestoreExpr>(*Arg) || getContext().hasSameUnqualifiedType((*Arg)->getType(), ArgTypes[Idx]) || (isa<ObjCMethodDecl>(AC.getDecl()) && isObjCMethodWithTypeParams(cast<ObjCMethodDecl>(AC.getDecl())))) && \"Argument and parameter types don't match\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 3422, __extension__ __PRETTY_FUNCTION__))
3420 (isa<ObjCMethodDecl>(AC.getDecl()) &&(static_cast <bool> ((!isa<ObjCIndirectCopyRestoreExpr
>(*Arg) || getContext().hasSameUnqualifiedType((*Arg)->
getType(), ArgTypes[Idx]) || (isa<ObjCMethodDecl>(AC.getDecl
()) && isObjCMethodWithTypeParams(cast<ObjCMethodDecl
>(AC.getDecl())))) && "Argument and parameter types don't match"
) ? void (0) : __assert_fail ("(!isa<ObjCIndirectCopyRestoreExpr>(*Arg) || getContext().hasSameUnqualifiedType((*Arg)->getType(), ArgTypes[Idx]) || (isa<ObjCMethodDecl>(AC.getDecl()) && isObjCMethodWithTypeParams(cast<ObjCMethodDecl>(AC.getDecl())))) && \"Argument and parameter types don't match\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 3422, __extension__ __PRETTY_FUNCTION__))
3421 isObjCMethodWithTypeParams(cast<ObjCMethodDecl>(AC.getDecl())))) &&(static_cast <bool> ((!isa<ObjCIndirectCopyRestoreExpr
>(*Arg) || getContext().hasSameUnqualifiedType((*Arg)->
getType(), ArgTypes[Idx]) || (isa<ObjCMethodDecl>(AC.getDecl
()) && isObjCMethodWithTypeParams(cast<ObjCMethodDecl
>(AC.getDecl())))) && "Argument and parameter types don't match"
) ? void (0) : __assert_fail ("(!isa<ObjCIndirectCopyRestoreExpr>(*Arg) || getContext().hasSameUnqualifiedType((*Arg)->getType(), ArgTypes[Idx]) || (isa<ObjCMethodDecl>(AC.getDecl()) && isObjCMethodWithTypeParams(cast<ObjCMethodDecl>(AC.getDecl())))) && \"Argument and parameter types don't match\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 3422, __extension__ __PRETTY_FUNCTION__))
3422 "Argument and parameter types don't match")(static_cast <bool> ((!isa<ObjCIndirectCopyRestoreExpr
>(*Arg) || getContext().hasSameUnqualifiedType((*Arg)->
getType(), ArgTypes[Idx]) || (isa<ObjCMethodDecl>(AC.getDecl
()) && isObjCMethodWithTypeParams(cast<ObjCMethodDecl
>(AC.getDecl())))) && "Argument and parameter types don't match"
) ? void (0) : __assert_fail ("(!isa<ObjCIndirectCopyRestoreExpr>(*Arg) || getContext().hasSameUnqualifiedType((*Arg)->getType(), ArgTypes[Idx]) || (isa<ObjCMethodDecl>(AC.getDecl()) && isObjCMethodWithTypeParams(cast<ObjCMethodDecl>(AC.getDecl())))) && \"Argument and parameter types don't match\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 3422, __extension__ __PRETTY_FUNCTION__))
;
3423 EmitCallArg(Args, *Arg, ArgTypes[Idx]);
3424 // In particular, we depend on it being the last arg in Args, and the
3425 // objectsize bits depend on there only being one arg if !LeftToRight.
3426 assert(InitialArgSize + 1 == Args.size() &&(static_cast <bool> (InitialArgSize + 1 == Args.size() &&
"The code below depends on only adding one arg per EmitCallArg"
) ? void (0) : __assert_fail ("InitialArgSize + 1 == Args.size() && \"The code below depends on only adding one arg per EmitCallArg\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 3427, __extension__ __PRETTY_FUNCTION__))
3427 "The code below depends on only adding one arg per EmitCallArg")(static_cast <bool> (InitialArgSize + 1 == Args.size() &&
"The code below depends on only adding one arg per EmitCallArg"
) ? void (0) : __assert_fail ("InitialArgSize + 1 == Args.size() && \"The code below depends on only adding one arg per EmitCallArg\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 3427, __extension__ __PRETTY_FUNCTION__))
;
3428 (void)InitialArgSize;
3429 // Since pointer argument are never emitted as LValue, it is safe to emit
3430 // non-null argument check for r-value only.
3431 if (!Args.back().hasLValue()) {
3432 RValue RVArg = Args.back().getKnownRValue();
3433 EmitNonNullArgCheck(RVArg, ArgTypes[Idx], (*Arg)->getExprLoc(), AC,
3434 ParamsToSkip + Idx);
3435 // @llvm.objectsize should never have side-effects and shouldn't need
3436 // destruction/cleanups, so we can safely "emit" it after its arg,
3437 // regardless of right-to-leftness
3438 MaybeEmitImplicitObjectSize(Idx, *Arg, RVArg);
3439 }
3440 }
3441
3442 if (!LeftToRight) {
3443 // Un-reverse the arguments we just evaluated so they match up with the LLVM
3444 // IR function.
3445 std::reverse(Args.begin() + CallArgsStart, Args.end());
3446 }
3447}
3448
3449namespace {
3450
3451struct DestroyUnpassedArg final : EHScopeStack::Cleanup {
3452 DestroyUnpassedArg(Address Addr, QualType Ty)
3453 : Addr(Addr), Ty(Ty) {}
3454
3455 Address Addr;
3456 QualType Ty;
3457
3458 void Emit(CodeGenFunction &CGF, Flags flags) override {
3459 QualType::DestructionKind DtorKind = Ty.isDestructedType();
3460 if (DtorKind == QualType::DK_cxx_destructor) {
3461 const CXXDestructorDecl *Dtor = Ty->getAsCXXRecordDecl()->getDestructor();
3462 assert(!Dtor->isTrivial())(static_cast <bool> (!Dtor->isTrivial()) ? void (0) :
__assert_fail ("!Dtor->isTrivial()", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 3462, __extension__ __PRETTY_FUNCTION__))
;
3463 CGF.EmitCXXDestructorCall(Dtor, Dtor_Complete, /*for vbase*/ false,
3464 /*Delegating=*/false, Addr);
3465 } else {
3466 CGF.callCStructDestructor(CGF.MakeAddrLValue(Addr, Ty));
3467 }
3468 }
3469};
3470
3471struct DisableDebugLocationUpdates {
3472 CodeGenFunction &CGF;
3473 bool disabledDebugInfo;
3474 DisableDebugLocationUpdates(CodeGenFunction &CGF, const Expr *E) : CGF(CGF) {
3475 if ((disabledDebugInfo = isa<CXXDefaultArgExpr>(E) && CGF.getDebugInfo()))
3476 CGF.disableDebugInfo();
3477 }
3478 ~DisableDebugLocationUpdates() {
3479 if (disabledDebugInfo)
3480 CGF.enableDebugInfo();
3481 }
3482};
3483
3484} // end anonymous namespace
3485
3486RValue CallArg::getRValue(CodeGenFunction &CGF) const {
3487 if (!HasLV)
3488 return RV;
3489 LValue Copy = CGF.MakeAddrLValue(CGF.CreateMemTemp(Ty), Ty);
3490 CGF.EmitAggregateCopy(Copy, LV, Ty, AggValueSlot::DoesNotOverlap,
3491 LV.isVolatile());
3492 IsUsed = true;
3493 return RValue::getAggregate(Copy.getAddress());
3494}
3495
3496void CallArg::copyInto(CodeGenFunction &CGF, Address Addr) const {
3497 LValue Dst = CGF.MakeAddrLValue(Addr, Ty);
3498 if (!HasLV && RV.isScalar())
3499 CGF.EmitStoreOfScalar(RV.getScalarVal(), Dst, /*init=*/true);
3500 else if (!HasLV && RV.isComplex())
3501 CGF.EmitStoreOfComplex(RV.getComplexVal(), Dst, /*init=*/true);
3502 else {
3503 auto Addr = HasLV ? LV.getAddress() : RV.getAggregateAddress();
3504 LValue SrcLV = CGF.MakeAddrLValue(Addr, Ty);
3505 // We assume that call args are never copied into subobjects.
3506 CGF.EmitAggregateCopy(Dst, SrcLV, Ty, AggValueSlot::DoesNotOverlap,
3507 HasLV ? LV.isVolatileQualified()
3508 : RV.isVolatileQualified());
3509 }
3510 IsUsed = true;
3511}
3512
3513void CodeGenFunction::EmitCallArg(CallArgList &args, const Expr *E,
3514 QualType type) {
3515 DisableDebugLocationUpdates Dis(*this, E);
3516 if (const ObjCIndirectCopyRestoreExpr *CRE
3517 = dyn_cast<ObjCIndirectCopyRestoreExpr>(E)) {
3518 assert(getLangOpts().ObjCAutoRefCount)(static_cast <bool> (getLangOpts().ObjCAutoRefCount) ? void
(0) : __assert_fail ("getLangOpts().ObjCAutoRefCount", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 3518, __extension__ __PRETTY_FUNCTION__))
;
3519 return emitWritebackArg(*this, args, CRE);
3520 }
3521
3522 assert(type->isReferenceType() == E->isGLValue() &&(static_cast <bool> (type->isReferenceType() == E->
isGLValue() && "reference binding to unmaterialized r-value!"
) ? void (0) : __assert_fail ("type->isReferenceType() == E->isGLValue() && \"reference binding to unmaterialized r-value!\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 3523, __extension__ __PRETTY_FUNCTION__))
3523 "reference binding to unmaterialized r-value!")(static_cast <bool> (type->isReferenceType() == E->
isGLValue() && "reference binding to unmaterialized r-value!"
) ? void (0) : __assert_fail ("type->isReferenceType() == E->isGLValue() && \"reference binding to unmaterialized r-value!\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 3523, __extension__ __PRETTY_FUNCTION__))
;
3524
3525 if (E->isGLValue()) {
3526 assert(E->getObjectKind() == OK_Ordinary)(static_cast <bool> (E->getObjectKind() == OK_Ordinary
) ? void (0) : __assert_fail ("E->getObjectKind() == OK_Ordinary"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 3526, __extension__ __PRETTY_FUNCTION__))
;
3527 return args.add(EmitReferenceBindingToExpr(E), type);
3528 }
3529
3530 bool HasAggregateEvalKind = hasAggregateEvaluationKind(type);
3531
3532 // In the Microsoft C++ ABI, aggregate arguments are destructed by the callee.
3533 // However, we still have to push an EH-only cleanup in case we unwind before
3534 // we make it to the call.
3535 if (HasAggregateEvalKind && getContext().isParamDestroyedInCallee(type)) {
3536 // If we're using inalloca, use the argument memory. Otherwise, use a
3537 // temporary.
3538 AggValueSlot Slot;
3539 if (args.isUsingInAlloca())
3540 Slot = createPlaceholderSlot(*this, type);
3541 else
3542 Slot = CreateAggTemp(type, "agg.tmp");
3543
3544 Slot.setExternallyDestructed();
3545
3546 EmitAggExpr(E, Slot);
3547 RValue RV = Slot.asRValue();
3548 args.add(RV, type);
3549
3550 if (type->getAsCXXRecordDecl() || needsEHCleanup(type.isDestructedType())) {
3551 // Create a no-op GEP between the placeholder and the cleanup so we can
3552 // RAUW it successfully. It also serves as a marker of the first
3553 // instruction where the cleanup is active.
3554 pushFullExprCleanup<DestroyUnpassedArg>(EHCleanup, Slot.getAddress(),
3555 type);
3556 // This unreachable is a temporary marker which will be removed later.
3557 llvm::Instruction *IsActive = Builder.CreateUnreachable();
3558 args.addArgCleanupDeactivation(EHStack.getInnermostEHScope(), IsActive);
3559 }
3560 return;
3561 }
3562
3563 if (HasAggregateEvalKind && isa<ImplicitCastExpr>(E) &&
3564 cast<CastExpr>(E)->getCastKind() == CK_LValueToRValue) {
3565 LValue L = EmitLValue(cast<CastExpr>(E)->getSubExpr());
3566 assert(L.isSimple())(static_cast <bool> (L.isSimple()) ? void (0) : __assert_fail
("L.isSimple()", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 3566, __extension__ __PRETTY_FUNCTION__))
;
3567 args.addUncopiedAggregate(L, type);
3568 return;
3569 }
3570
3571 args.add(EmitAnyExprToTemp(E), type);
3572}
3573
3574QualType CodeGenFunction::getVarArgType(const Expr *Arg) {
3575 // System headers on Windows define NULL to 0 instead of 0LL on Win64. MSVC
3576 // implicitly widens null pointer constants that are arguments to varargs
3577 // functions to pointer-sized ints.
3578 if (!getTarget().getTriple().isOSWindows())
3579 return Arg->getType();
3580
3581 if (Arg->getType()->isIntegerType() &&
3582 getContext().getTypeSize(Arg->getType()) <
3583 getContext().getTargetInfo().getPointerWidth(0) &&
3584 Arg->isNullPointerConstant(getContext(),
3585 Expr::NPC_ValueDependentIsNotNull)) {
3586 return getContext().getIntPtrType();
3587 }
3588
3589 return Arg->getType();
3590}
3591
3592// In ObjC ARC mode with no ObjC ARC exception safety, tell the ARC
3593// optimizer it can aggressively ignore unwind edges.
3594void
3595CodeGenFunction::AddObjCARCExceptionMetadata(llvm::Instruction *Inst) {
3596 if (CGM.getCodeGenOpts().OptimizationLevel != 0 &&
3597 !CGM.getCodeGenOpts().ObjCAutoRefCountExceptions)
3598 Inst->setMetadata("clang.arc.no_objc_arc_exceptions",
3599 CGM.getNoObjCARCExceptionsMetadata());
3600}
3601
3602/// Emits a call to the given no-arguments nounwind runtime function.
3603llvm::CallInst *
3604CodeGenFunction::EmitNounwindRuntimeCall(llvm::Value *callee,
3605 const llvm::Twine &name) {
3606 return EmitNounwindRuntimeCall(callee, None, name);
3607}
3608
3609/// Emits a call to the given nounwind runtime function.
3610llvm::CallInst *
3611CodeGenFunction::EmitNounwindRuntimeCall(llvm::Value *callee,
3612 ArrayRef<llvm::Value*> args,
3613 const llvm::Twine &name) {
3614 llvm::CallInst *call = EmitRuntimeCall(callee, args, name);
3615 call->setDoesNotThrow();
3616 return call;
3617}
3618
3619/// Emits a simple call (never an invoke) to the given no-arguments
3620/// runtime function.
3621llvm::CallInst *
3622CodeGenFunction::EmitRuntimeCall(llvm::Value *callee,
3623 const llvm::Twine &name) {
3624 return EmitRuntimeCall(callee, None, name);
3625}
3626
3627// Calls which may throw must have operand bundles indicating which funclet
3628// they are nested within.
3629SmallVector<llvm::OperandBundleDef, 1>
3630CodeGenFunction::getBundlesForFunclet(llvm::Value *Callee) {
3631 SmallVector<llvm::OperandBundleDef, 1> BundleList;
3632 // There is no need for a funclet operand bundle if we aren't inside a
3633 // funclet.
3634 if (!CurrentFuncletPad)
3635 return BundleList;
3636
3637 // Skip intrinsics which cannot throw.
3638 auto *CalleeFn = dyn_cast<llvm::Function>(Callee->stripPointerCasts());
3639 if (CalleeFn && CalleeFn->isIntrinsic() && CalleeFn->doesNotThrow())
3640 return BundleList;
3641
3642 BundleList.emplace_back("funclet", CurrentFuncletPad);
3643 return BundleList;
3644}
3645
3646/// Emits a simple call (never an invoke) to the given runtime function.
3647llvm::CallInst *
3648CodeGenFunction::EmitRuntimeCall(llvm::Value *callee,
3649 ArrayRef<llvm::Value*> args,
3650 const llvm::Twine &name) {
3651 llvm::CallInst *call =
3652 Builder.CreateCall(callee, args, getBundlesForFunclet(callee), name);
3653 call->setCallingConv(getRuntimeCC());
3654 return call;
3655}
3656
3657/// Emits a call or invoke to the given noreturn runtime function.
3658void CodeGenFunction::EmitNoreturnRuntimeCallOrInvoke(llvm::Value *callee,
3659 ArrayRef<llvm::Value*> args) {
3660 SmallVector<llvm::OperandBundleDef, 1> BundleList =
3661 getBundlesForFunclet(callee);
3662
3663 if (getInvokeDest()) {
3664 llvm::InvokeInst *invoke =
3665 Builder.CreateInvoke(callee,
3666 getUnreachableBlock(),
3667 getInvokeDest(),
3668 args,
3669 BundleList);
3670 invoke->setDoesNotReturn();
3671 invoke->setCallingConv(getRuntimeCC());
3672 } else {
3673 llvm::CallInst *call = Builder.CreateCall(callee, args, BundleList);
3674 call->setDoesNotReturn();
3675 call->setCallingConv(getRuntimeCC());
3676 Builder.CreateUnreachable();
3677 }
3678}
3679
3680/// Emits a call or invoke instruction to the given nullary runtime function.
3681llvm::CallSite
3682CodeGenFunction::EmitRuntimeCallOrInvoke(llvm::Value *callee,
3683 const Twine &name) {
3684 return EmitRuntimeCallOrInvoke(callee, None, name);
3685}
3686
3687/// Emits a call or invoke instruction to the given runtime function.
3688llvm::CallSite
3689CodeGenFunction::EmitRuntimeCallOrInvoke(llvm::Value *callee,
3690 ArrayRef<llvm::Value*> args,
3691 const Twine &name) {
3692 llvm::CallSite callSite = EmitCallOrInvoke(callee, args, name);
3693 callSite.setCallingConv(getRuntimeCC());
3694 return callSite;
3695}
3696
3697/// Emits a call or invoke instruction to the given function, depending
3698/// on the current state of the EH stack.
3699llvm::CallSite
3700CodeGenFunction::EmitCallOrInvoke(llvm::Value *Callee,
3701 ArrayRef<llvm::Value *> Args,
3702 const Twine &Name) {
3703 llvm::BasicBlock *InvokeDest = getInvokeDest();
3704 SmallVector<llvm::OperandBundleDef, 1> BundleList =
3705 getBundlesForFunclet(Callee);
3706
3707 llvm::Instruction *Inst;
3708 if (!InvokeDest)
3709 Inst = Builder.CreateCall(Callee, Args, BundleList, Name);
3710 else {
3711 llvm::BasicBlock *ContBB = createBasicBlock("invoke.cont");
3712 Inst = Builder.CreateInvoke(Callee, ContBB, InvokeDest, Args, BundleList,
3713 Name);
3714 EmitBlock(ContBB);
3715 }
3716
3717 // In ObjC ARC mode with no ObjC ARC exception safety, tell the ARC
3718 // optimizer it can aggressively ignore unwind edges.
3719 if (CGM.getLangOpts().ObjCAutoRefCount)
3720 AddObjCARCExceptionMetadata(Inst);
3721
3722 return llvm::CallSite(Inst);
3723}
3724
3725void CodeGenFunction::deferPlaceholderReplacement(llvm::Instruction *Old,
3726 llvm::Value *New) {
3727 DeferredReplacements.push_back(std::make_pair(Old, New));
3728}
3729
3730RValue CodeGenFunction::EmitCall(const CGFunctionInfo &CallInfo,
3731 const CGCallee &Callee,
3732 ReturnValueSlot ReturnValue,
3733 const CallArgList &CallArgs,
3734 llvm::Instruction **callOrInvoke,
3735 SourceLocation Loc) {
3736 // FIXME: We no longer need the types from CallArgs; lift up and simplify.
3737
3738 assert(Callee.isOrdinary() || Callee.isVirtual())(static_cast <bool> (Callee.isOrdinary() || Callee.isVirtual
()) ? void (0) : __assert_fail ("Callee.isOrdinary() || Callee.isVirtual()"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 3738, __extension__ __PRETTY_FUNCTION__))
;
3739
3740 // Handle struct-return functions by passing a pointer to the
3741 // location that we would like to return into.
3742 QualType RetTy = CallInfo.getReturnType();
3743 const ABIArgInfo &RetAI = CallInfo.getReturnInfo();
3744
3745 llvm::FunctionType *IRFuncTy = Callee.getFunctionType();
3746
3747 // 1. Set up the arguments.
3748
3749 // If we're using inalloca, insert the allocation after the stack save.
3750 // FIXME: Do this earlier rather than hacking it in here!
3751 Address ArgMemory = Address::invalid();
3752 const llvm::StructLayout *ArgMemoryLayout = nullptr;
3753 if (llvm::StructType *ArgStruct = CallInfo.getArgStruct()) {
3754 const llvm::DataLayout &DL = CGM.getDataLayout();
3755 ArgMemoryLayout = DL.getStructLayout(ArgStruct);
3756 llvm::Instruction *IP = CallArgs.getStackBase();
3757 llvm::AllocaInst *AI;
3758 if (IP) {
3759 IP = IP->getNextNode();
3760 AI = new llvm::AllocaInst(ArgStruct, DL.getAllocaAddrSpace(),
3761 "argmem", IP);
3762 } else {
3763 AI = CreateTempAlloca(ArgStruct, "argmem");
3764 }
3765 auto Align = CallInfo.getArgStructAlignment();
3766 AI->setAlignment(Align.getQuantity());
3767 AI->setUsedWithInAlloca(true);
3768 assert(AI->isUsedWithInAlloca() && !AI->isStaticAlloca())(static_cast <bool> (AI->isUsedWithInAlloca() &&
!AI->isStaticAlloca()) ? void (0) : __assert_fail ("AI->isUsedWithInAlloca() && !AI->isStaticAlloca()"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 3768, __extension__ __PRETTY_FUNCTION__))
;
3769 ArgMemory = Address(AI, Align);
3770 }
3771
3772 // Helper function to drill into the inalloca allocation.
3773 auto createInAllocaStructGEP = [&](unsigned FieldIndex) -> Address {
3774 auto FieldOffset =
3775 CharUnits::fromQuantity(ArgMemoryLayout->getElementOffset(FieldIndex));
3776 return Builder.CreateStructGEP(ArgMemory, FieldIndex, FieldOffset);
3777 };
3778
3779 ClangToLLVMArgMapping IRFunctionArgs(CGM.getContext(), CallInfo);
3780 SmallVector<llvm::Value *, 16> IRCallArgs(IRFunctionArgs.totalIRArgs());
3781
3782 // If the call returns a temporary with struct return, create a temporary
3783 // alloca to hold the result, unless one is given to us.
3784 Address SRetPtr = Address::invalid();
3785 llvm::Value *UnusedReturnSizePtr = nullptr;
3786 if (RetAI.isIndirect() || RetAI.isInAlloca() || RetAI.isCoerceAndExpand()) {
3787 if (!ReturnValue.isNull()) {
3788 SRetPtr = ReturnValue.getValue();
3789 } else {
3790 SRetPtr = CreateMemTemp(RetTy);
3791 if (HaveInsertPoint() && ReturnValue.isUnused()) {
3792 uint64_t size =
3793 CGM.getDataLayout().getTypeAllocSize(ConvertTypeForMem(RetTy));
3794 UnusedReturnSizePtr = EmitLifetimeStart(size, SRetPtr.getPointer());
3795 }
3796 }
3797 if (IRFunctionArgs.hasSRetArg()) {
3798 IRCallArgs[IRFunctionArgs.getSRetArgNo()] = SRetPtr.getPointer();
3799 } else if (RetAI.isInAlloca()) {
3800 Address Addr = createInAllocaStructGEP(RetAI.getInAllocaFieldIndex());
3801 Builder.CreateStore(SRetPtr.getPointer(), Addr);
3802 }
3803 }
3804
3805 Address swiftErrorTemp = Address::invalid();
3806 Address swiftErrorArg = Address::invalid();
3807
3808 // Translate all of the arguments as necessary to match the IR lowering.
3809 assert(CallInfo.arg_size() == CallArgs.size() &&(static_cast <bool> (CallInfo.arg_size() == CallArgs.size
() && "Mismatch between function signature & arguments."
) ? void (0) : __assert_fail ("CallInfo.arg_size() == CallArgs.size() && \"Mismatch between function signature & arguments.\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 3810, __extension__ __PRETTY_FUNCTION__))
3810 "Mismatch between function signature & arguments.")(static_cast <bool> (CallInfo.arg_size() == CallArgs.size
() && "Mismatch between function signature & arguments."
) ? void (0) : __assert_fail ("CallInfo.arg_size() == CallArgs.size() && \"Mismatch between function signature & arguments.\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 3810, __extension__ __PRETTY_FUNCTION__))
;
3811 unsigned ArgNo = 0;
3812 CGFunctionInfo::const_arg_iterator info_it = CallInfo.arg_begin();
3813 for (CallArgList::const_iterator I = CallArgs.begin(), E = CallArgs.end();
3814 I != E; ++I, ++info_it, ++ArgNo) {
3815 const ABIArgInfo &ArgInfo = info_it->info;
3816
3817 // Insert a padding argument to ensure proper alignment.
3818 if (IRFunctionArgs.hasPaddingArg(ArgNo))
3819 IRCallArgs[IRFunctionArgs.getPaddingArgNo(ArgNo)] =
3820 llvm::UndefValue::get(ArgInfo.getPaddingType());
3821
3822 unsigned FirstIRArg, NumIRArgs;
3823 std::tie(FirstIRArg, NumIRArgs) = IRFunctionArgs.getIRArgs(ArgNo);
3824
3825 switch (ArgInfo.getKind()) {
3826 case ABIArgInfo::InAlloca: {
3827 assert(NumIRArgs == 0)(static_cast <bool> (NumIRArgs == 0) ? void (0) : __assert_fail
("NumIRArgs == 0", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 3827, __extension__ __PRETTY_FUNCTION__))
;
3828 assert(getTarget().getTriple().getArch() == llvm::Triple::x86)(static_cast <bool> (getTarget().getTriple().getArch() ==
llvm::Triple::x86) ? void (0) : __assert_fail ("getTarget().getTriple().getArch() == llvm::Triple::x86"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 3828, __extension__ __PRETTY_FUNCTION__))
;
3829 if (I->isAggregate()) {
3830 // Replace the placeholder with the appropriate argument slot GEP.
3831 Address Addr = I->hasLValue()
3832 ? I->getKnownLValue().getAddress()
3833 : I->getKnownRValue().getAggregateAddress();
3834 llvm::Instruction *Placeholder =
3835 cast<llvm::Instruction>(Addr.getPointer());
3836 CGBuilderTy::InsertPoint IP = Builder.saveIP();
3837 Builder.SetInsertPoint(Placeholder);
3838 Addr = createInAllocaStructGEP(ArgInfo.getInAllocaFieldIndex());
3839 Builder.restoreIP(IP);
3840 deferPlaceholderReplacement(Placeholder, Addr.getPointer());
3841 } else {
3842 // Store the RValue into the argument struct.
3843 Address Addr = createInAllocaStructGEP(ArgInfo.getInAllocaFieldIndex());
3844 unsigned AS = Addr.getType()->getPointerAddressSpace();
3845 llvm::Type *MemType = ConvertTypeForMem(I->Ty)->getPointerTo(AS);
3846 // There are some cases where a trivial bitcast is not avoidable. The
3847 // definition of a type later in a translation unit may change it's type
3848 // from {}* to (%struct.foo*)*.
3849 if (Addr.getType() != MemType)
3850 Addr = Builder.CreateBitCast(Addr, MemType);
3851 I->copyInto(*this, Addr);
3852 }
3853 break;
3854 }
3855
3856 case ABIArgInfo::Indirect: {
3857 assert(NumIRArgs == 1)(static_cast <bool> (NumIRArgs == 1) ? void (0) : __assert_fail
("NumIRArgs == 1", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 3857, __extension__ __PRETTY_FUNCTION__))
;
3858 if (!I->isAggregate()) {
3859 // Make a temporary alloca to pass the argument.
3860 Address Addr = CreateMemTemp(I->Ty, ArgInfo.getIndirectAlign(),
3861 "indirect-arg-temp", false);
3862 IRCallArgs[FirstIRArg] = Addr.getPointer();
3863
3864 I->copyInto(*this, Addr);
3865 } else {
3866 // We want to avoid creating an unnecessary temporary+copy here;
3867 // however, we need one in three cases:
3868 // 1. If the argument is not byval, and we are required to copy the
3869 // source. (This case doesn't occur on any common architecture.)
3870 // 2. If the argument is byval, RV is not sufficiently aligned, and
3871 // we cannot force it to be sufficiently aligned.
3872 // 3. If the argument is byval, but RV is not located in default
3873 // or alloca address space.
3874 Address Addr = I->hasLValue()
3875 ? I->getKnownLValue().getAddress()
3876 : I->getKnownRValue().getAggregateAddress();
3877 llvm::Value *V = Addr.getPointer();
3878 CharUnits Align = ArgInfo.getIndirectAlign();
3879 const llvm::DataLayout *TD = &CGM.getDataLayout();
3880
3881 assert((FirstIRArg >= IRFuncTy->getNumParams() ||(static_cast <bool> ((FirstIRArg >= IRFuncTy->getNumParams
() || IRFuncTy->getParamType(FirstIRArg)->getPointerAddressSpace
() == TD->getAllocaAddrSpace()) && "indirect argument must be in alloca address space"
) ? void (0) : __assert_fail ("(FirstIRArg >= IRFuncTy->getNumParams() || IRFuncTy->getParamType(FirstIRArg)->getPointerAddressSpace() == TD->getAllocaAddrSpace()) && \"indirect argument must be in alloca address space\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 3884, __extension__ __PRETTY_FUNCTION__))
3882 IRFuncTy->getParamType(FirstIRArg)->getPointerAddressSpace() ==(static_cast <bool> ((FirstIRArg >= IRFuncTy->getNumParams
() || IRFuncTy->getParamType(FirstIRArg)->getPointerAddressSpace
() == TD->getAllocaAddrSpace()) && "indirect argument must be in alloca address space"
) ? void (0) : __assert_fail ("(FirstIRArg >= IRFuncTy->getNumParams() || IRFuncTy->getParamType(FirstIRArg)->getPointerAddressSpace() == TD->getAllocaAddrSpace()) && \"indirect argument must be in alloca address space\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 3884, __extension__ __PRETTY_FUNCTION__))
3883 TD->getAllocaAddrSpace()) &&(static_cast <bool> ((FirstIRArg >= IRFuncTy->getNumParams
() || IRFuncTy->getParamType(FirstIRArg)->getPointerAddressSpace
() == TD->getAllocaAddrSpace()) && "indirect argument must be in alloca address space"
) ? void (0) : __assert_fail ("(FirstIRArg >= IRFuncTy->getNumParams() || IRFuncTy->getParamType(FirstIRArg)->getPointerAddressSpace() == TD->getAllocaAddrSpace()) && \"indirect argument must be in alloca address space\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 3884, __extension__ __PRETTY_FUNCTION__))
3884 "indirect argument must be in alloca address space")(static_cast <bool> ((FirstIRArg >= IRFuncTy->getNumParams
() || IRFuncTy->getParamType(FirstIRArg)->getPointerAddressSpace
() == TD->getAllocaAddrSpace()) && "indirect argument must be in alloca address space"
) ? void (0) : __assert_fail ("(FirstIRArg >= IRFuncTy->getNumParams() || IRFuncTy->getParamType(FirstIRArg)->getPointerAddressSpace() == TD->getAllocaAddrSpace()) && \"indirect argument must be in alloca address space\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 3884, __extension__ __PRETTY_FUNCTION__))
;
3885
3886 bool NeedCopy = false;
3887
3888 if (Addr.getAlignment() < Align &&
3889 llvm::getOrEnforceKnownAlignment(V, Align.getQuantity(), *TD) <
3890 Align.getQuantity()) {
3891 NeedCopy = true;
3892 } else if (I->hasLValue()) {
3893 auto LV = I->getKnownLValue();
3894 auto AS = LV.getAddressSpace();
3895 if ((!ArgInfo.getIndirectByVal() &&
3896 (LV.getAlignment() >=
3897 getContext().getTypeAlignInChars(I->Ty))) ||
3898 (ArgInfo.getIndirectByVal() &&
3899 ((AS != LangAS::Default && AS != LangAS::opencl_private &&
3900 AS != CGM.getASTAllocaAddressSpace())))) {
3901 NeedCopy = true;
3902 }
3903 }
3904 if (NeedCopy) {
3905 // Create an aligned temporary, and copy to it.
3906 Address AI = CreateMemTemp(I->Ty, ArgInfo.getIndirectAlign(),
3907 "byval-temp", false);
3908 IRCallArgs[FirstIRArg] = AI.getPointer();
3909 I->copyInto(*this, AI);
3910 } else {
3911 // Skip the extra memcpy call.
3912 auto *T = V->getType()->getPointerElementType()->getPointerTo(
3913 CGM.getDataLayout().getAllocaAddrSpace());
3914 IRCallArgs[FirstIRArg] = getTargetHooks().performAddrSpaceCast(
3915 *this, V, LangAS::Default, CGM.getASTAllocaAddressSpace(), T,
3916 true);
3917 }
3918 }
3919 break;
3920 }
3921
3922 case ABIArgInfo::Ignore:
3923 assert(NumIRArgs == 0)(static_cast <bool> (NumIRArgs == 0) ? void (0) : __assert_fail
("NumIRArgs == 0", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 3923, __extension__ __PRETTY_FUNCTION__))
;
3924 break;
3925
3926 case ABIArgInfo::Extend:
3927 case ABIArgInfo::Direct: {
3928 if (!isa<llvm::StructType>(ArgInfo.getCoerceToType()) &&
3929 ArgInfo.getCoerceToType() == ConvertType(info_it->type) &&
3930 ArgInfo.getDirectOffset() == 0) {
3931 assert(NumIRArgs == 1)(static_cast <bool> (NumIRArgs == 1) ? void (0) : __assert_fail
("NumIRArgs == 1", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 3931, __extension__ __PRETTY_FUNCTION__))
;
3932 llvm::Value *V;
3933 if (!I->isAggregate())
3934 V = I->getKnownRValue().getScalarVal();
3935 else
3936 V = Builder.CreateLoad(
3937 I->hasLValue() ? I->getKnownLValue().getAddress()
3938 : I->getKnownRValue().getAggregateAddress());
3939
3940 // Implement swifterror by copying into a new swifterror argument.
3941 // We'll write back in the normal path out of the call.
3942 if (CallInfo.getExtParameterInfo(ArgNo).getABI()
3943 == ParameterABI::SwiftErrorResult) {
3944 assert(!swiftErrorTemp.isValid() && "multiple swifterror args")(static_cast <bool> (!swiftErrorTemp.isValid() &&
"multiple swifterror args") ? void (0) : __assert_fail ("!swiftErrorTemp.isValid() && \"multiple swifterror args\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 3944, __extension__ __PRETTY_FUNCTION__))
;
3945
3946 QualType pointeeTy = I->Ty->getPointeeType();
3947 swiftErrorArg =
3948 Address(V, getContext().getTypeAlignInChars(pointeeTy));
3949
3950 swiftErrorTemp =
3951 CreateMemTemp(pointeeTy, getPointerAlign(), "swifterror.temp");
3952 V = swiftErrorTemp.getPointer();
3953 cast<llvm::AllocaInst>(V)->setSwiftError(true);
3954
3955 llvm::Value *errorValue = Builder.CreateLoad(swiftErrorArg);
3956 Builder.CreateStore(errorValue, swiftErrorTemp);
3957 }
3958
3959 // We might have to widen integers, but we should never truncate.
3960 if (ArgInfo.getCoerceToType() != V->getType() &&
3961 V->getType()->isIntegerTy())
3962 V = Builder.CreateZExt(V, ArgInfo.getCoerceToType());
3963
3964 // If the argument doesn't match, perform a bitcast to coerce it. This
3965 // can happen due to trivial type mismatches.
3966 if (FirstIRArg < IRFuncTy->getNumParams() &&
3967 V->getType() != IRFuncTy->getParamType(FirstIRArg))
3968 V = Builder.CreateBitCast(V, IRFuncTy->getParamType(FirstIRArg));
3969
3970 IRCallArgs[FirstIRArg] = V;
3971 break;
3972 }
3973
3974 // FIXME: Avoid the conversion through memory if possible.
3975 Address Src = Address::invalid();
3976 if (!I->isAggregate()) {
3977 Src = CreateMemTemp(I->Ty, "coerce");
3978 I->copyInto(*this, Src);
3979 } else {
3980 Src = I->hasLValue() ? I->getKnownLValue().getAddress()
3981 : I->getKnownRValue().getAggregateAddress();
3982 }
3983
3984 // If the value is offset in memory, apply the offset now.
3985 Src = emitAddressAtOffset(*this, Src, ArgInfo);
3986
3987 // Fast-isel and the optimizer generally like scalar values better than
3988 // FCAs, so we flatten them if this is safe to do for this argument.
3989 llvm::StructType *STy =
3990 dyn_cast<llvm::StructType>(ArgInfo.getCoerceToType());
3991 if (STy && ArgInfo.isDirect() && ArgInfo.getCanBeFlattened()) {
3992 llvm::Type *SrcTy = Src.getType()->getElementType();
3993 uint64_t SrcSize = CGM.getDataLayout().getTypeAllocSize(SrcTy);
3994 uint64_t DstSize = CGM.getDataLayout().getTypeAllocSize(STy);
3995
3996 // If the source type is smaller than the destination type of the
3997 // coerce-to logic, copy the source value into a temp alloca the size
3998 // of the destination type to allow loading all of it. The bits past
3999 // the source value are left undef.
4000 if (SrcSize < DstSize) {
4001 Address TempAlloca
4002 = CreateTempAlloca(STy, Src.getAlignment(),
4003 Src.getName() + ".coerce");
4004 Builder.CreateMemCpy(TempAlloca, Src, SrcSize);
4005 Src = TempAlloca;
4006 } else {
4007 Src = Builder.CreateBitCast(Src,
4008 STy->getPointerTo(Src.getAddressSpace()));
4009 }
4010
4011 auto SrcLayout = CGM.getDataLayout().getStructLayout(STy);
4012 assert(NumIRArgs == STy->getNumElements())(static_cast <bool> (NumIRArgs == STy->getNumElements
()) ? void (0) : __assert_fail ("NumIRArgs == STy->getNumElements()"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 4012, __extension__ __PRETTY_FUNCTION__))
;
4013 for (unsigned i = 0, e = STy->getNumElements(); i != e; ++i) {
4014 auto Offset = CharUnits::fromQuantity(SrcLayout->getElementOffset(i));
4015 Address EltPtr = Builder.CreateStructGEP(Src, i, Offset);
4016 llvm::Value *LI = Builder.CreateLoad(EltPtr);
4017 IRCallArgs[FirstIRArg + i] = LI;
4018 }
4019 } else {
4020 // In the simple case, just pass the coerced loaded value.
4021 assert(NumIRArgs == 1)(static_cast <bool> (NumIRArgs == 1) ? void (0) : __assert_fail
("NumIRArgs == 1", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 4021, __extension__ __PRETTY_FUNCTION__))
;
4022 IRCallArgs[FirstIRArg] =
4023 CreateCoercedLoad(Src, ArgInfo.getCoerceToType(), *this);
4024 }
4025
4026 break;
4027 }
4028
4029 case ABIArgInfo::CoerceAndExpand: {
4030 auto coercionType = ArgInfo.getCoerceAndExpandType();
4031 auto layout = CGM.getDataLayout().getStructLayout(coercionType);
4032
4033 llvm::Value *tempSize = nullptr;
4034 Address addr = Address::invalid();
4035 if (I->isAggregate()) {
4036 addr = I->hasLValue() ? I->getKnownLValue().getAddress()
4037 : I->getKnownRValue().getAggregateAddress();
4038
4039 } else {
4040 RValue RV = I->getKnownRValue();
4041 assert(RV.isScalar())(static_cast <bool> (RV.isScalar()) ? void (0) : __assert_fail
("RV.isScalar()", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 4041, __extension__ __PRETTY_FUNCTION__))
; // complex should always just be direct
4042
4043 llvm::Type *scalarType = RV.getScalarVal()->getType();
4044 auto scalarSize = CGM.getDataLayout().getTypeAllocSize(scalarType);
4045 auto scalarAlign = CGM.getDataLayout().getPrefTypeAlignment(scalarType);
4046
4047 // Materialize to a temporary.
4048 addr = CreateTempAlloca(RV.getScalarVal()->getType(),
4049 CharUnits::fromQuantity(std::max(layout->getAlignment(),
4050 scalarAlign)));
4051 tempSize = EmitLifetimeStart(scalarSize, addr.getPointer());
4052
4053 Builder.CreateStore(RV.getScalarVal(), addr);
4054 }
4055
4056 addr = Builder.CreateElementBitCast(addr, coercionType);
4057
4058 unsigned IRArgPos = FirstIRArg;
4059 for (unsigned i = 0, e = coercionType->getNumElements(); i != e; ++i) {
4060 llvm::Type *eltType = coercionType->getElementType(i);
4061 if (ABIArgInfo::isPaddingForCoerceAndExpand(eltType)) continue;
4062 Address eltAddr = Builder.CreateStructGEP(addr, i, layout);
4063 llvm::Value *elt = Builder.CreateLoad(eltAddr);
4064 IRCallArgs[IRArgPos++] = elt;
4065 }
4066 assert(IRArgPos == FirstIRArg + NumIRArgs)(static_cast <bool> (IRArgPos == FirstIRArg + NumIRArgs
) ? void (0) : __assert_fail ("IRArgPos == FirstIRArg + NumIRArgs"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 4066, __extension__ __PRETTY_FUNCTION__))
;
4067
4068 if (tempSize) {
4069 EmitLifetimeEnd(tempSize, addr.getPointer());
4070 }
4071
4072 break;
4073 }
4074
4075 case ABIArgInfo::Expand:
4076 unsigned IRArgPos = FirstIRArg;
4077 ExpandTypeToArgs(I->Ty, *I, IRFuncTy, IRCallArgs, IRArgPos);
4078 assert(IRArgPos == FirstIRArg + NumIRArgs)(static_cast <bool> (IRArgPos == FirstIRArg + NumIRArgs
) ? void (0) : __assert_fail ("IRArgPos == FirstIRArg + NumIRArgs"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 4078, __extension__ __PRETTY_FUNCTION__))
;
4079 break;
4080 }
4081 }
4082
4083 const CGCallee &ConcreteCallee = Callee.prepareConcreteCallee(*this);
4084 llvm::Value *CalleePtr = ConcreteCallee.getFunctionPointer();
4085
4086 // If we're using inalloca, set up that argument.
4087 if (ArgMemory.isValid()) {
4088 llvm::Value *Arg = ArgMemory.getPointer();
4089 if (CallInfo.isVariadic()) {
4090 // When passing non-POD arguments by value to variadic functions, we will
4091 // end up with a variadic prototype and an inalloca call site. In such
4092 // cases, we can't do any parameter mismatch checks. Give up and bitcast
4093 // the callee.
4094 unsigned CalleeAS = CalleePtr->getType()->getPointerAddressSpace();
4095 auto FnTy = getTypes().GetFunctionType(CallInfo)->getPointerTo(CalleeAS);
4096 CalleePtr = Builder.CreateBitCast(CalleePtr, FnTy);
4097 } else {
4098 llvm::Type *LastParamTy =
4099 IRFuncTy->getParamType(IRFuncTy->getNumParams() - 1);
4100 if (Arg->getType() != LastParamTy) {
4101#ifndef NDEBUG
4102 // Assert that these structs have equivalent element types.
4103 llvm::StructType *FullTy = CallInfo.getArgStruct();
4104 llvm::StructType *DeclaredTy = cast<llvm::StructType>(
4105 cast<llvm::PointerType>(LastParamTy)->getElementType());
4106 assert(DeclaredTy->getNumElements() == FullTy->getNumElements())(static_cast <bool> (DeclaredTy->getNumElements() ==
FullTy->getNumElements()) ? void (0) : __assert_fail ("DeclaredTy->getNumElements() == FullTy->getNumElements()"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 4106, __extension__ __PRETTY_FUNCTION__))
;
4107 for (llvm::StructType::element_iterator DI = DeclaredTy->element_begin(),
4108 DE = DeclaredTy->element_end(),
4109 FI = FullTy->element_begin();
4110 DI != DE; ++DI, ++FI)
4111 assert(*DI == *FI)(static_cast <bool> (*DI == *FI) ? void (0) : __assert_fail
("*DI == *FI", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 4111, __extension__ __PRETTY_FUNCTION__))
;
4112#endif
4113 Arg = Builder.CreateBitCast(Arg, LastParamTy);
4114 }
4115 }
4116 assert(IRFunctionArgs.hasInallocaArg())(static_cast <bool> (IRFunctionArgs.hasInallocaArg()) ?
void (0) : __assert_fail ("IRFunctionArgs.hasInallocaArg()",
"/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 4116, __extension__ __PRETTY_FUNCTION__))
;
4117 IRCallArgs[IRFunctionArgs.getInallocaArgNo()] = Arg;
4118 }
4119
4120 // 2. Prepare the function pointer.
4121
4122 // If the callee is a bitcast of a non-variadic function to have a
4123 // variadic function pointer type, check to see if we can remove the
4124 // bitcast. This comes up with unprototyped functions.
4125 //
4126 // This makes the IR nicer, but more importantly it ensures that we
4127 // can inline the function at -O0 if it is marked always_inline.
4128 auto simplifyVariadicCallee = [](llvm::Value *Ptr) -> llvm::Value* {
4129 llvm::FunctionType *CalleeFT =
4130 cast<llvm::FunctionType>(Ptr->getType()->getPointerElementType());
4131 if (!CalleeFT->isVarArg())
4132 return Ptr;
4133
4134 llvm::ConstantExpr *CE = dyn_cast<llvm::ConstantExpr>(Ptr);
4135 if (!CE || CE->getOpcode() != llvm::Instruction::BitCast)
4136 return Ptr;
4137
4138 llvm::Function *OrigFn = dyn_cast<llvm::Function>(CE->getOperand(0));
4139 if (!OrigFn)
4140 return Ptr;
4141
4142 llvm::FunctionType *OrigFT = OrigFn->getFunctionType();
4143
4144 // If the original type is variadic, or if any of the component types
4145 // disagree, we cannot remove the cast.
4146 if (OrigFT->isVarArg() ||
4147 OrigFT->getNumParams() != CalleeFT->getNumParams() ||
4148 OrigFT->getReturnType() != CalleeFT->getReturnType())
4149 return Ptr;
4150
4151 for (unsigned i = 0, e = OrigFT->getNumParams(); i != e; ++i)
4152 if (OrigFT->getParamType(i) != CalleeFT->getParamType(i))
4153 return Ptr;
4154
4155 return OrigFn;
4156 };
4157 CalleePtr = simplifyVariadicCallee(CalleePtr);
4158
4159 // 3. Perform the actual call.
4160
4161 // Deactivate any cleanups that we're supposed to do immediately before
4162 // the call.
4163 if (!CallArgs.getCleanupsToDeactivate().empty())
4164 deactivateArgCleanupsBeforeCall(*this, CallArgs);
4165
4166 // Assert that the arguments we computed match up. The IR verifier
4167 // will catch this, but this is a common enough source of problems
4168 // during IRGen changes that it's way better for debugging to catch
4169 // it ourselves here.
4170#ifndef NDEBUG
4171 assert(IRCallArgs.size() == IRFuncTy->getNumParams() || IRFuncTy->isVarArg())(static_cast <bool> (IRCallArgs.size() == IRFuncTy->
getNumParams() || IRFuncTy->isVarArg()) ? void (0) : __assert_fail
("IRCallArgs.size() == IRFuncTy->getNumParams() || IRFuncTy->isVarArg()"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 4171, __extension__ __PRETTY_FUNCTION__))
;
4172 for (unsigned i = 0; i < IRCallArgs.size(); ++i) {
4173 // Inalloca argument can have different type.
4174 if (IRFunctionArgs.hasInallocaArg() &&
4175 i == IRFunctionArgs.getInallocaArgNo())
4176 continue;
4177 if (i < IRFuncTy->getNumParams())
4178 assert(IRCallArgs[i]->getType() == IRFuncTy->getParamType(i))(static_cast <bool> (IRCallArgs[i]->getType() == IRFuncTy
->getParamType(i)) ? void (0) : __assert_fail ("IRCallArgs[i]->getType() == IRFuncTy->getParamType(i)"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 4178, __extension__ __PRETTY_FUNCTION__))
;
4179 }
4180#endif
4181
4182 // Compute the calling convention and attributes.
4183 unsigned CallingConv;
4184 llvm::AttributeList Attrs;
4185 CGM.ConstructAttributeList(CalleePtr->getName(), CallInfo,
4186 Callee.getAbstractInfo(), Attrs, CallingConv,
4187 /*AttrOnCallSite=*/true);
4188
4189 // Apply some call-site-specific attributes.
4190 // TODO: work this into building the attribute set.
4191
4192 // Apply always_inline to all calls within flatten functions.
4193 // FIXME: should this really take priority over __try, below?
4194 if (CurCodeDecl && CurCodeDecl->hasAttr<FlattenAttr>() &&
4195 !(Callee.getAbstractInfo().getCalleeDecl() &&
4196 Callee.getAbstractInfo().getCalleeDecl()->hasAttr<NoInlineAttr>())) {
4197 Attrs =
4198 Attrs.addAttribute(getLLVMContext(), llvm::AttributeList::FunctionIndex,
4199 llvm::Attribute::AlwaysInline);
4200 }
4201
4202 // Disable inlining inside SEH __try blocks.
4203 if (isSEHTryScope()) {
4204 Attrs =
4205 Attrs.addAttribute(getLLVMContext(), llvm::AttributeList::FunctionIndex,
4206 llvm::Attribute::NoInline);
4207 }
4208
4209 // Decide whether to use a call or an invoke.
4210 bool CannotThrow;
4211 if (currentFunctionUsesSEHTry()) {
4212 // SEH cares about asynchronous exceptions, so everything can "throw."
4213 CannotThrow = false;
4214 } else if (isCleanupPadScope() &&
4215 EHPersonality::get(*this).isMSVCXXPersonality()) {
4216 // The MSVC++ personality will implicitly terminate the program if an
4217 // exception is thrown during a cleanup outside of a try/catch.
4218 // We don't need to model anything in IR to get this behavior.
4219 CannotThrow = true;
4220 } else {
4221 // Otherwise, nounwind call sites will never throw.
4222 CannotThrow = Attrs.hasAttribute(llvm::AttributeList::FunctionIndex,
4223 llvm::Attribute::NoUnwind);
4224 }
4225
4226 // If we made a temporary, be sure to clean up after ourselves. Note that we
4227 // can't depend on being inside of an ExprWithCleanups, so we need to manually
4228 // pop this cleanup later on. Being eager about this is OK, since this
4229 // temporary is 'invisible' outside of the callee.
4230 if (UnusedReturnSizePtr)
4231 pushFullExprCleanup<CallLifetimeEnd>(NormalEHLifetimeMarker, SRetPtr,
4232 UnusedReturnSizePtr);
4233
4234 llvm::BasicBlock *InvokeDest = CannotThrow ? nullptr : getInvokeDest();
4235
4236 SmallVector<llvm::OperandBundleDef, 1> BundleList =
4237 getBundlesForFunclet(CalleePtr);
4238
4239 // Emit the actual call/invoke instruction.
4240 llvm::CallSite CS;
4241 if (!InvokeDest) {
4242 CS = Builder.CreateCall(CalleePtr, IRCallArgs, BundleList);
4243 } else {
4244 llvm::BasicBlock *Cont = createBasicBlock("invoke.cont");
4245 CS = Builder.CreateInvoke(CalleePtr, Cont, InvokeDest, IRCallArgs,
4246 BundleList);
4247 EmitBlock(Cont);
4248 }
4249 llvm::Instruction *CI = CS.getInstruction();
4250 if (callOrInvoke)
4251 *callOrInvoke = CI;
4252
4253 // Apply the attributes and calling convention.
4254 CS.setAttributes(Attrs);
4255 CS.setCallingConv(static_cast<llvm::CallingConv::ID>(CallingConv));
4256
4257 // Apply various metadata.
4258
4259 if (!CI->getType()->isVoidTy())
4260 CI->setName("call");
4261
4262 // Insert instrumentation or attach profile metadata at indirect call sites.
4263 // For more details, see the comment before the definition of
4264 // IPVK_IndirectCallTarget in InstrProfData.inc.
4265 if (!CS.getCalledFunction())
4266 PGO.valueProfile(Builder, llvm::IPVK_IndirectCallTarget,
4267 CI, CalleePtr);
4268
4269 // In ObjC ARC mode with no ObjC ARC exception safety, tell the ARC
4270 // optimizer it can aggressively ignore unwind edges.
4271 if (CGM.getLangOpts().ObjCAutoRefCount)
4272 AddObjCARCExceptionMetadata(CI);
4273
4274 // Suppress tail calls if requested.
4275 if (llvm::CallInst *Call = dyn_cast<llvm::CallInst>(CI)) {
4276 const Decl *TargetDecl = Callee.getAbstractInfo().getCalleeDecl();
4277 if (TargetDecl && TargetDecl->hasAttr<NotTailCalledAttr>())
4278 Call->setTailCallKind(llvm::CallInst::TCK_NoTail);
4279 }
4280
4281 // 4. Finish the call.
4282
4283 // If the call doesn't return, finish the basic block and clear the
4284 // insertion point; this allows the rest of IRGen to discard
4285 // unreachable code.
4286 if (CS.doesNotReturn()) {
4287 if (UnusedReturnSizePtr)
4288 PopCleanupBlock();
4289
4290 // Strip away the noreturn attribute to better diagnose unreachable UB.
4291 if (SanOpts.has(SanitizerKind::Unreachable)) {
4292 if (auto *F = CS.getCalledFunction())
4293 F->removeFnAttr(llvm::Attribute::NoReturn);
4294 CS.removeAttribute(llvm::AttributeList::FunctionIndex,
4295 llvm::Attribute::NoReturn);
4296 }
4297
4298 EmitUnreachable(Loc);
4299 Builder.ClearInsertionPoint();
4300
4301 // FIXME: For now, emit a dummy basic block because expr emitters in
4302 // generally are not ready to handle emitting expressions at unreachable
4303 // points.
4304 EnsureInsertPoint();
4305
4306 // Return a reasonable RValue.
4307 return GetUndefRValue(RetTy);
4308 }
4309
4310 // Perform the swifterror writeback.
4311 if (swiftErrorTemp.isValid()) {
4312 llvm::Value *errorResult = Builder.CreateLoad(swiftErrorTemp);
4313 Builder.CreateStore(errorResult, swiftErrorArg);
4314 }
4315
4316 // Emit any call-associated writebacks immediately. Arguably this
4317 // should happen after any return-value munging.
4318 if (CallArgs.hasWritebacks())
4319 emitWritebacks(*this, CallArgs);
4320
4321 // The stack cleanup for inalloca arguments has to run out of the normal
4322 // lexical order, so deactivate it and run it manually here.
4323 CallArgs.freeArgumentMemory(*this);
4324
4325 // Extract the return value.
4326 RValue Ret = [&] {
4327 switch (RetAI.getKind()) {
4328 case ABIArgInfo::CoerceAndExpand: {
4329 auto coercionType = RetAI.getCoerceAndExpandType();
4330 auto layout = CGM.getDataLayout().getStructLayout(coercionType);
4331
4332 Address addr = SRetPtr;
4333 addr = Builder.CreateElementBitCast(addr, coercionType);
4334
4335 assert(CI->getType() == RetAI.getUnpaddedCoerceAndExpandType())(static_cast <bool> (CI->getType() == RetAI.getUnpaddedCoerceAndExpandType
()) ? void (0) : __assert_fail ("CI->getType() == RetAI.getUnpaddedCoerceAndExpandType()"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 4335, __extension__ __PRETTY_FUNCTION__))
;
4336 bool requiresExtract = isa<llvm::StructType>(CI->getType());
4337
4338 unsigned unpaddedIndex = 0;
4339 for (unsigned i = 0, e = coercionType->getNumElements(); i != e; ++i) {
4340 llvm::Type *eltType = coercionType->getElementType(i);
4341 if (ABIArgInfo::isPaddingForCoerceAndExpand(eltType)) continue;
4342 Address eltAddr = Builder.CreateStructGEP(addr, i, layout);
4343 llvm::Value *elt = CI;
4344 if (requiresExtract)
4345 elt = Builder.CreateExtractValue(elt, unpaddedIndex++);
4346 else
4347 assert(unpaddedIndex == 0)(static_cast <bool> (unpaddedIndex == 0) ? void (0) : __assert_fail
("unpaddedIndex == 0", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 4347, __extension__ __PRETTY_FUNCTION__))
;
4348 Builder.CreateStore(elt, eltAddr);
4349 }
4350 // FALLTHROUGH
4351 LLVM_FALLTHROUGH[[clang::fallthrough]];
4352 }
4353
4354 case ABIArgInfo::InAlloca:
4355 case ABIArgInfo::Indirect: {
4356 RValue ret = convertTempToRValue(SRetPtr, RetTy, SourceLocation());
4357 if (UnusedReturnSizePtr)
4358 PopCleanupBlock();
4359 return ret;
4360 }
4361
4362 case ABIArgInfo::Ignore:
4363 // If we are ignoring an argument that had a result, make sure to
4364 // construct the appropriate return value for our caller.
4365 return GetUndefRValue(RetTy);
4366
4367 case ABIArgInfo::Extend:
4368 case ABIArgInfo::Direct: {
4369 llvm::Type *RetIRTy = ConvertType(RetTy);
4370 if (RetAI.getCoerceToType() == RetIRTy && RetAI.getDirectOffset() == 0) {
4371 switch (getEvaluationKind(RetTy)) {
4372 case TEK_Complex: {
4373 llvm::Value *Real = Builder.CreateExtractValue(CI, 0);
4374 llvm::Value *Imag = Builder.CreateExtractValue(CI, 1);
4375 return RValue::getComplex(std::make_pair(Real, Imag));
4376 }
4377 case TEK_Aggregate: {
4378 Address DestPtr = ReturnValue.getValue();
4379 bool DestIsVolatile = ReturnValue.isVolatile();
4380
4381 if (!DestPtr.isValid()) {
4382 DestPtr = CreateMemTemp(RetTy, "agg.tmp");
4383 DestIsVolatile = false;
4384 }
4385 BuildAggStore(*this, CI, DestPtr, DestIsVolatile);
4386 return RValue::getAggregate(DestPtr);
4387 }
4388 case TEK_Scalar: {
4389 // If the argument doesn't match, perform a bitcast to coerce it. This
4390 // can happen due to trivial type mismatches.
4391 llvm::Value *V = CI;
4392 if (V->getType() != RetIRTy)
4393 V = Builder.CreateBitCast(V, RetIRTy);
4394 return RValue::get(V);
4395 }
4396 }
4397 llvm_unreachable("bad evaluation kind")::llvm::llvm_unreachable_internal("bad evaluation kind", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 4397)
;
4398 }
4399
4400 Address DestPtr = ReturnValue.getValue();
4401 bool DestIsVolatile = ReturnValue.isVolatile();
4402
4403 if (!DestPtr.isValid()) {
4404 DestPtr = CreateMemTemp(RetTy, "coerce");
4405 DestIsVolatile = false;
4406 }
4407
4408 // If the value is offset in memory, apply the offset now.
4409 Address StorePtr = emitAddressAtOffset(*this, DestPtr, RetAI);
4410 CreateCoercedStore(CI, StorePtr, DestIsVolatile, *this);
4411
4412 return convertTempToRValue(DestPtr, RetTy, SourceLocation());
4413 }
4414
4415 case ABIArgInfo::Expand:
4416 llvm_unreachable("Invalid ABI kind for return argument")::llvm::llvm_unreachable_internal("Invalid ABI kind for return argument"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 4416)
;
4417 }
4418
4419 llvm_unreachable("Unhandled ABIArgInfo::Kind")::llvm::llvm_unreachable_internal("Unhandled ABIArgInfo::Kind"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/CodeGen/CGCall.cpp"
, 4419)
;
4420 } ();
4421
4422 // Emit the assume_aligned check on the return value.
4423 const Decl *TargetDecl = Callee.getAbstractInfo().getCalleeDecl();
4424 if (Ret.isScalar() && TargetDecl) {
4425 if (const auto *AA = TargetDecl->getAttr<AssumeAlignedAttr>()) {
4426 llvm::Value *OffsetValue = nullptr;
4427 if (const auto *Offset = AA->getOffset())
4428 OffsetValue = EmitScalarExpr(Offset);
4429
4430 llvm::Value *Alignment = EmitScalarExpr(AA->getAlignment());
4431 llvm::ConstantInt *AlignmentCI = cast<llvm::ConstantInt>(Alignment);
4432 EmitAlignmentAssumption(Ret.getScalarVal(), AlignmentCI->getZExtValue(),
4433 OffsetValue);
4434 } else if (const auto *AA = TargetDecl->getAttr<AllocAlignAttr>()) {
4435 llvm::Value *ParamVal =
4436 CallArgs[AA->getParamIndex().getLLVMIndex()].getRValue(
4437 *this).getScalarVal();
4438 EmitAlignmentAssumption(Ret.getScalarVal(), ParamVal);
4439 }
4440 }
4441
4442 return Ret;
4443}
4444
4445CGCallee CGCallee::prepareConcreteCallee(CodeGenFunction &CGF) const {
4446 if (isVirtual()) {
4447 const CallExpr *CE = getVirtualCallExpr();
4448 return CGF.CGM.getCXXABI().getVirtualFunctionPointer(
4449 CGF, getVirtualMethodDecl(), getThisAddress(),
4450 getFunctionType(), CE ? CE->getLocStart() : SourceLocation());
4451 }
4452
4453 return *this;
4454}
4455
4456/* VarArg handling */
4457
4458Address CodeGenFunction::EmitVAArg(VAArgExpr *VE, Address &VAListAddr) {
4459 VAListAddr = VE->isMicrosoftABI()
4460 ? EmitMSVAListRef(VE->getSubExpr())
4461 : EmitVAListRef(VE->getSubExpr());
4462 QualType Ty = VE->getType();
4463 if (VE->isMicrosoftABI())
4464 return CGM.getTypes().getABIInfo().EmitMSVAArg(*this, VAListAddr, Ty);
4465 return CGM.getTypes().getABIInfo().EmitVAArg(*this, VAListAddr, Ty);
4466}