clang 17.0.0git
Enumerations | 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 "PatternInit.h"
#include "TargetInfo.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/Attr.h"
#include "clang/AST/CharUnits.h"
#include "clang/AST/Decl.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/DeclOpenMP.h"
#include "clang/Basic/CodeGenOptions.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Basic/TargetInfo.h"
#include "clang/CodeGen/CGFunctionInfo.h"
#include "clang/Sema/Sema.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/GlobalVariable.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/Type.h"
#include <optional>
Include dependency graph for CGDecl.cpp:

Go to the source code of this file.

Enumerations

enum class  IsPattern { No , Yes }
 

Functions

static std::string getStaticDeclName (CodeGenModule &CGM, const VarDecl &D)
 
static void EmitAutoVarWithLifetime (CodeGenFunction &CGF, const VarDecl &var, Address addr, Qualifiers::ObjCLifetime lifetime)
 EmitAutoVarWithLifetime - Does the setup required for an automatic variable with lifetime.
 
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.
 
static void emitStoresForInitAfterBZero (CodeGenModule &CGM, llvm::Constant *Init, Address Loc, bool isVolatile, CGBuilderTy &Builder, bool IsAutoInit)
 For inits that canEmitInitWithFewStoresAfterBZero returned true for, emit the scalar stores that would be required.
 
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.
 
static llvm::Value * shouldUseMemSetToInitialize (llvm::Constant *Init, uint64_t GlobalSize, const llvm::DataLayout &DL)
 Decide whether we should use memset to initialize a local variable instead of using a memcpy from a constant global.
 
static bool shouldSplitConstantStore (CodeGenModule &CGM, uint64_t GlobalByteSize)
 Decide whether we want to split a constant structure or array store into a sequence of its fields' stores.
 
static llvm::Constant * patternOrZeroFor (CodeGenModule &CGM, IsPattern isPattern, llvm::Type *Ty)
 Generate a constant filled with either a pattern or zeroes.
 
static llvm::Constant * constWithPadding (CodeGenModule &CGM, IsPattern isPattern, llvm::Constant *constant)
 Replace all padding bytes in a given constant with either a pattern byte or 0x00.
 
static llvm::Constant * constStructWithPadding (CodeGenModule &CGM, IsPattern isPattern, llvm::StructType *STy, llvm::Constant *constant)
 Helper function for constWithPadding() to deal with padding in structures.
 
static Address createUnnamedGlobalForMemcpyFrom (CodeGenModule &CGM, const VarDecl &D, CGBuilderTy &Builder, llvm::Constant *Constant, CharUnits Align)
 
static void emitStoresForConstant (CodeGenModule &CGM, const VarDecl &D, Address Loc, bool isVolatile, CGBuilderTy &Builder, llvm::Constant *constant, bool IsAutoInit)
 
static void emitStoresForZeroInit (CodeGenModule &CGM, const VarDecl &D, Address Loc, bool isVolatile, CGBuilderTy &Builder)
 
static void emitStoresForPatternInit (CodeGenModule &CGM, const VarDecl &D, Address Loc, bool isVolatile, CGBuilderTy &Builder)
 
static bool containsUndef (llvm::Constant *constant)
 
static llvm::Constant * replaceUndef (CodeGenModule &CGM, IsPattern isPattern, llvm::Constant *constant)
 
static bool isCapturedBy (const VarDecl &Var, const Expr *E)
 Determines whether the given __block variable is potentially captured by the given expression.
 
static bool isCapturedBy (const VarDecl &Var, const Stmt *S)
 Determines whether the given __block variable is potentially captured by the given statement.
 
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.
 

Enumeration Type Documentation

◆ IsPattern

enum class IsPattern
strong
Enumerator
No 
Yes 

Definition at line 1028 of file CGDecl.cpp.

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 899 of file CGDecl.cpp.

References canEmitInitWithFewStoresAfterBZero().

Referenced by canEmitInitWithFewStoresAfterBZero(), and shouldUseBZeroPlusStoresToInitialize().

◆ constStructWithPadding()

static llvm::Constant * constStructWithPadding ( CodeGenModule &  CGM,
IsPattern  isPattern,
llvm::StructType *  STy,
llvm::Constant *  constant 
)
static

Helper function for constWithPadding() to deal with padding in structures.

Definition at line 1043 of file CGDecl.cpp.

References constWithPadding(), clang::CodeGen::CodeGenModule::getDataLayout(), clang::CodeGen::CodeGenModule::getLLVMContext(), and patternOrZeroFor().

Referenced by constWithPadding().

◆ constWithPadding()

static llvm::Constant * constWithPadding ( CodeGenModule &  CGM,
IsPattern  isPattern,
llvm::Constant *  constant 
)
static

Replace all padding bytes in a given constant with either a pattern byte or 0x00.

Definition at line 1083 of file CGDecl.cpp.

References constStructWithPadding(), and constWithPadding().

Referenced by constStructWithPadding(), constWithPadding(), emitStoresForPatternInit(), and emitStoresForZeroInit().

◆ containsUndef()

static bool containsUndef ( llvm::Constant *  constant)
static

Definition at line 1293 of file CGDecl.cpp.

References containsUndef().

Referenced by containsUndef(), and replaceUndef().

◆ createUnnamedGlobalForMemcpyFrom()

static Address createUnnamedGlobalForMemcpyFrom ( CodeGenModule &  CGM,
const VarDecl &  D,
CGBuilderTy &  Builder,
llvm::Constant *  Constant,
CharUnits  Align 
)
static

Definition at line 1169 of file CGDecl.cpp.

References clang::CodeGen::CodeGenModule::createUnnamedGlobalFrom(), and clang::CodeGen::CodeGenTypeCache::Int8Ty.

Referenced by emitStoresForConstant().

◆ drillIntoBlockVariable()

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

Definition at line 753 of file CGDecl.cpp.

References clang::CodeGen::CodeGenFunction::emitBlockByrefAddress(), clang::CodeGen::LValue::getAddress(), and clang::CodeGen::LValue::setAddress().

◆ EmitAutoVarWithLifetime()

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

EmitAutoVarWithLifetime - Does the setup required for an automatic variable with lifetime.

Definition at line 635 of file CGDecl.cpp.

References clang::CodeGen::CodeGenFunction::destroyARCStrongImprecise, clang::CodeGen::CodeGenFunction::destroyARCStrongPrecise, clang::CodeGen::CodeGenFunction::destroyARCWeak, clang::CodeGen::EHCleanup, clang::CodeGen::CodeGenFunction::getARCCleanupKind(), clang::ValueDecl::getType(), clang::Decl::hasAttr(), clang::CodeGen::NormalAndEHCleanup, clang::Qualifiers::OCL_Autoreleasing, clang::Qualifiers::OCL_ExplicitNone, clang::Qualifiers::OCL_None, clang::Qualifiers::OCL_Strong, clang::Qualifiers::OCL_Weak, and clang::CodeGen::CodeGenFunction::pushDestroy().

◆ emitPartialArrayDestroy()

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

Perform partial array destruction as if in an EH cleanup.

Unlike emitArrayDestroy, the element type here may still be an array type.

Definition at line 2295 of file CGDecl.cpp.

References clang::ast_matchers::arrayType, clang::CodeGen::CodeGenFunction::Builder, clang::CodeGen::CodeGenFunction::ConvertTypeForMem(), clang::CodeGen::CodeGenFunction::emitArrayDestroy(), clang::ASTContext::getAsArrayType(), clang::CodeGen::CodeGenFunction::getContext(), clang::CodeGen::CodeGenTypeCache::SizeTy, and clang::ast_matchers::type.

◆ emitStoresForConstant()

static void emitStoresForConstant ( CodeGenModule &  CGM,
const VarDecl &  D,
Address  Loc,
bool  isVolatile,
CGBuilderTy &  Builder,
llvm::Constant *  constant,
bool  IsAutoInit 
)
static

Definition at line 1178 of file CGDecl.cpp.

References createUnnamedGlobalForMemcpyFrom(), emitStoresForConstant(), emitStoresForInitAfterBZero(), clang::CodeGen::Address::getAlignment(), clang::CodeGen::CodeGenModule::getDataLayout(), clang::CodeGen::Address::getElementType(), clang::CodeGen::CodeGenTypeCache::Int8Ty, clang::CodeGen::CodeGenTypeCache::IntPtrTy, shouldSplitConstantStore(), shouldUseBZeroPlusStoresToInitialize(), and shouldUseMemSetToInitialize().

Referenced by emitStoresForConstant(), emitStoresForPatternInit(), and emitStoresForZeroInit().

◆ emitStoresForInitAfterBZero()

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

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

Definition at line 937 of file CGDecl.cpp.

References emitStoresForInitAfterBZero().

Referenced by emitStoresForConstant(), and emitStoresForInitAfterBZero().

◆ emitStoresForPatternInit()

static void emitStoresForPatternInit ( CodeGenModule &  CGM,
const VarDecl &  D,
Address  Loc,
bool  isVolatile,
CGBuilderTy &  Builder 
)
static

Definition at line 1282 of file CGDecl.cpp.

References constWithPadding(), emitStoresForConstant(), clang::CodeGen::Address::getElementType(), and clang::CodeGen::initializationPatternFor().

◆ emitStoresForZeroInit()

static void emitStoresForZeroInit ( CodeGenModule &  CGM,
const VarDecl &  D,
Address  Loc,
bool  isVolatile,
CGBuilderTy &  Builder 
)
static

Definition at line 1272 of file CGDecl.cpp.

References constWithPadding(), emitStoresForConstant(), and clang::CodeGen::Address::getElementType().

◆ getStaticDeclName()

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

Definition at line 221 of file CGDecl.cpp.

References clang::CodeGen::CodeGenModule::getBlockMangledName(), clang::Decl::getDeclContext(), clang::CodeGen::CodeGenModule::getLangOpts(), clang::CodeGen::CodeGenModule::getMangledName(), clang::NamedDecl::getNameAsString(), and clang::NamedDecl::isExternallyVisible().

Referenced by clang::CodeGen::CodeGenModule::getOrCreateStaticVarDecl().

◆ isAccessedBy() [1/2]

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

Definition at line 696 of file CGDecl.cpp.

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

◆ isAccessedBy() [2/2]

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

Definition at line 671 of file CGDecl.cpp.

References clang::BlockDecl::captures(), isAccessedBy(), and s.

Referenced by 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 1663 of file CGDecl.cpp.

References clang::Block, clang::CompoundStmt::body(), clang::Stmt::children(), clang::VarDecl::getInit(), clang::Expr::IgnoreParenCasts(), and isCapturedBy().

Referenced by isCapturedBy().

◆ 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 1652 of file CGDecl.cpp.

References isCapturedBy().

◆ patternOrZeroFor()

static llvm::Constant * patternOrZeroFor ( CodeGenModule &  CGM,
IsPattern  isPattern,
llvm::Type *  Ty 
)
static

Generate a constant filled with either a pattern or zeroes.

Definition at line 1031 of file CGDecl.cpp.

References clang::CodeGen::initializationPatternFor().

Referenced by constStructWithPadding(), and replaceUndef().

◆ replaceUndef()

static llvm::Constant * replaceUndef ( CodeGenModule &  CGM,
IsPattern  isPattern,
llvm::Constant *  constant 
)
static

Definition at line 1304 of file CGDecl.cpp.

References containsUndef(), patternOrZeroFor(), and replaceUndef().

Referenced by replaceUndef().

◆ shouldSplitConstantStore()

static bool shouldSplitConstantStore ( CodeGenModule &  CGM,
uint64_t  GlobalByteSize 
)
static

Decide whether we want to split a constant structure or array store into a sequence of its fields' stores.

This may cost us code size and compilation speed, but plays better with store optimizations.

Definition at line 1017 of file CGDecl.cpp.

References clang::CodeGen::CodeGenModule::getCodeGenOpts().

Referenced by emitStoresForConstant().

◆ 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 984 of file CGDecl.cpp.

References canEmitInitWithFewStoresAfterBZero().

Referenced by emitStoresForConstant().

◆ shouldUseMemSetToInitialize()

static llvm::Value * shouldUseMemSetToInitialize ( llvm::Constant *  Init,
uint64_t  GlobalSize,
const llvm::DataLayout &  DL 
)
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 1005 of file CGDecl.cpp.

Referenced by emitStoresForConstant().

◆ tryEmitARCCopyWeakInit()

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

Definition at line 703 of file CGDecl.cpp.

References clang::CodeGen::CodeGenFunction::Builder, clang::ast_matchers::castExpr, clang::CodeGen::CGBuilderTy::CreateElementBitCast(), clang::CodeGen::CodeGenFunction::EmitARCCopyWeak(), clang::CodeGen::CodeGenFunction::EmitARCMoveWeak(), clang::CodeGen::CodeGenFunction::EmitLValue(), clang::CodeGen::LValue::getAddress(), clang::CodeGen::Address::getElementType(), clang::QualType::getObjCLifetime(), clang::Expr::getType(), clang::Expr::IgnoreParens(), clang::Expr::isLValue(), clang::Expr::isXValue(), and clang::Qualifiers::OCL_Weak.

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