clang  7.0.0
Classes | Functions
CGDecl.cpp File Reference
#include "CGBlocks.h"
#include "CGCXXABI.h"
#include "CGCleanup.h"
#include "CGDebugInfo.h"
#include "CGOpenCLRuntime.h"
#include "CGOpenMPRuntime.h"
#include "CodeGenFunction.h"
#include "CodeGenModule.h"
#include "ConstantEmitter.h"
#include "TargetInfo.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/CharUnits.h"
#include "clang/AST/Decl.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/DeclOpenMP.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Basic/TargetInfo.h"
#include "clang/CodeGen/CGFunctionInfo.h"
#include "clang/Frontend/CodeGenOptions.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/GlobalVariable.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/Type.h"
Include dependency graph for CGDecl.cpp:

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Classes

class  BytePattern
 A byte pattern. More...
 

Functions

static std::string getStaticDeclName (CodeGenModule &CGM, const VarDecl &D)
 
static bool hasNontrivialDestruction (QualType T)
 hasNontrivialDestruction - Determine whether a type's destruction is non-trivial. More...
 
static void EmitAutoVarWithLifetime (CodeGenFunction &CGF, const VarDecl &var, Address addr, Qualifiers::ObjCLifetime lifetime)
 EmitAutoVarWithLifetime - Does the setup required for an automatic variable with lifetime. More...
 
static bool isAccessedBy (const VarDecl &var, const Stmt *s)
 
static bool isAccessedBy (const ValueDecl *decl, const Expr *e)
 
static bool tryEmitARCCopyWeakInit (CodeGenFunction &CGF, const LValue &destLV, const Expr *init)
 
static void drillIntoBlockVariable (CodeGenFunction &CGF, LValue &lvalue, const VarDecl *var)
 
static bool canEmitInitWithFewStoresAfterBZero (llvm::Constant *Init, unsigned &NumStores)
 Decide whether we can emit the non-zero parts of the specified initializer with equal or fewer than NumStores scalar stores. More...
 
static void emitStoresForInitAfterBZero (CodeGenModule &CGM, llvm::Constant *Init, Address Loc, bool isVolatile, CGBuilderTy &Builder)
 For inits that canEmitInitWithFewStoresAfterBZero returned true for, emit the scalar stores that would be required. More...
 
static bool shouldUseBZeroPlusStoresToInitialize (llvm::Constant *Init, uint64_t GlobalSize)
 Decide whether we should use bzero plus some stores to initialize a local variable instead of using a memcpy from a constant global. More...
 
static BytePattern constantIsRepeatedBytePattern (llvm::Constant *C)
 Figures out whether the constant can be initialized with memset. More...
 
static BytePattern shouldUseMemSetToInitialize (llvm::Constant *Init, uint64_t GlobalSize)
 Decide whether we should use memset to initialize a local variable instead of using a memcpy from a constant global. More...
 
static bool isCapturedBy (const VarDecl &Var, const Expr *E)
 Determines whether the given __block variable is potentially captured by the given expression. More...
 
static bool isCapturedBy (const VarDecl &Var, const Stmt *S)
 Determines whether the given __block variable is potentially captured by the given statement. More...
 
static void emitPartialArrayDestroy (CodeGenFunction &CGF, llvm::Value *begin, llvm::Value *end, QualType type, CharUnits elementAlign, CodeGenFunction::Destroyer *destroyer)
 Perform partial array destruction as if in an EH cleanup. More...
 

Function Documentation

◆ canEmitInitWithFewStoresAfterBZero()

static bool canEmitInitWithFewStoresAfterBZero ( llvm::Constant *  Init,
unsigned &  NumStores 
)
static

Decide whether we can emit the non-zero parts of the specified initializer with equal or fewer than NumStores scalar stores.

Definition at line 851 of file CGDecl.cpp.

Referenced by shouldUseBZeroPlusStoresToInitialize().

◆ constantIsRepeatedBytePattern()

static BytePattern constantIsRepeatedBytePattern ( llvm::Constant *  C)
static

Figures out whether the constant can be initialized with memset.

Definition at line 985 of file CGDecl.cpp.

References BytePattern::Any(), BytePattern::getValue(), and BytePattern::None().

Referenced by shouldUseMemSetToInitialize().

◆ drillIntoBlockVariable()

static void drillIntoBlockVariable ( CodeGenFunction CGF,
LValue lvalue,
const VarDecl var 
)
static

◆ EmitAutoVarWithLifetime()

static void EmitAutoVarWithLifetime ( CodeGenFunction CGF,
const VarDecl var,
Address  addr,
Qualifiers::ObjCLifetime  lifetime 
)
static

◆ emitPartialArrayDestroy()

static void emitPartialArrayDestroy ( CodeGenFunction CGF,
llvm::Value begin,
llvm::Value end,
QualType  type,
CharUnits  elementAlign,
CodeGenFunction::Destroyer *  destroyer 
)
static

◆ emitStoresForInitAfterBZero()

static void emitStoresForInitAfterBZero ( CodeGenModule CGM,
llvm::Constant *  Init,
Address  Loc,
bool  isVolatile,
CGBuilderTy Builder 
)
static

For inits that canEmitInitWithFewStoresAfterBZero returned true for, emit the scalar stores that would be required.

Definition at line 889 of file CGDecl.cpp.

References clang::CodeGen::CGBuilderTy::CreateConstInBoundsGEP2_32(), clang::CodeGen::CGBuilderTy::CreateStore(), and clang::CodeGen::CodeGenModule::getDataLayout().

Referenced by clang::CodeGen::CodeGenFunction::EmitAutoVarInit().

◆ getStaticDeclName()

static std::string getStaticDeclName ( CodeGenModule CGM,
const VarDecl D 
)
static

◆ hasNontrivialDestruction()

static bool hasNontrivialDestruction ( QualType  T)
static

hasNontrivialDestruction - Determine whether a type's destruction is non-trivial.

If so, and the variable uses static initialization, we must register its destructor to run on exit.

Definition at line 302 of file CGDecl.cpp.

References clang::Type::getAsCXXRecordDecl(), clang::Type::getBaseElementTypeUnsafe(), and clang::CXXRecordDecl::hasTrivialDestructor().

Referenced by clang::CodeGen::CodeGenFunction::AddInitializerToStaticVarDecl().

◆ isAccessedBy() [1/2]

static bool isAccessedBy ( const VarDecl var,
const Stmt s 
)
static

Definition at line 629 of file CGDecl.cpp.

Referenced by clang::CodeGen::CodeGenFunction::EmitScalarInit(), and isAccessedBy().

◆ isAccessedBy() [2/2]

static bool isAccessedBy ( const ValueDecl decl,
const Expr e 
)
static

Definition at line 654 of file CGDecl.cpp.

References clang::ast_matchers::decl, and isAccessedBy().

◆ isCapturedBy() [1/2]

static bool isCapturedBy ( const VarDecl Var,
const Expr E 
)
static

Determines whether the given __block variable is potentially captured by the given expression.

Definition at line 1369 of file CGDecl.cpp.

Referenced by clang::CodeGen::CodeGenFunction::EmitAutoVarInit().

◆ isCapturedBy() [2/2]

static bool isCapturedBy ( const VarDecl Var,
const Stmt S 
)
static

Determines whether the given __block variable is potentially captured by the given statement.

Definition at line 1358 of file CGDecl.cpp.

◆ shouldUseBZeroPlusStoresToInitialize()

static bool shouldUseBZeroPlusStoresToInitialize ( llvm::Constant *  Init,
uint64_t  GlobalSize 
)
static

Decide whether we should use bzero plus some stores to initialize a local variable instead of using a memcpy from a constant global.

It is beneficial to use bzero if the global is all zeros, or mostly zeros and large.

Definition at line 935 of file CGDecl.cpp.

References canEmitInitWithFewStoresAfterBZero().

Referenced by clang::CodeGen::CodeGenFunction::EmitAutoVarInit().

◆ shouldUseMemSetToInitialize()

static BytePattern shouldUseMemSetToInitialize ( llvm::Constant *  Init,
uint64_t  GlobalSize 
)
static

Decide whether we should use memset to initialize a local variable instead of using a memcpy from a constant global.

Assumes we've already decided to not user bzero. FIXME We could be more clever, as we are for bzero above, and generate memset followed by stores. It's unclear that's worth the effort.

Definition at line 1050 of file CGDecl.cpp.

References constantIsRepeatedBytePattern(), and BytePattern::None().

Referenced by clang::CodeGen::CodeGenFunction::EmitAutoVarInit().

◆ tryEmitARCCopyWeakInit()

static bool tryEmitARCCopyWeakInit ( CodeGenFunction CGF,
const LValue destLV,
const Expr init 
)
static