CGExprAgg.cpp File Reference

#include "CodeGenFunction.h"
#include "CGObjCRuntime.h"
#include "CodeGenModule.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/DeclCXX.h"
#include "clang/AST/DeclTemplate.h"
#include "clang/AST/StmtVisitor.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/GlobalVariable.h"
#include "llvm/IR/Intrinsics.h"

Include dependency graph for CGExprAgg.cpp:

Go to the source code of this file.

Functions
static bool	isTrivialFiller (Expr *E)
	Determine if E is a trivial array filler, that is, one that is equivalent to zero-initialization.
static Expr *	findPeephole (Expr *op, CastKind kind)
static bool	isBlockVarRef (const Expr *E)
static bool	isSimpleZero (const Expr *E, CodeGenFunction &CGF)
static CharUnits	GetNumNonZeroBytesInInit (const Expr *E, CodeGenFunction &CGF)
static void	CheckAggExprForMemSetUse (AggValueSlot &Slot, const Expr *E, CodeGenFunction &CGF)

---

Function Documentation

static void CheckAggExprForMemSetUse	(	AggValueSlot &	Slot,
		const Expr *	E,
		CodeGenFunction &	CGF
	)		[static]

CheckAggExprForMemSetUse - If the initializer is large and has a lot of zeros in it, emit a memset and avoid storing the individual zeros.

Definition at line 1327 of file CGExprAgg.cpp.

References clang::CodeGen::CodeGenFunction::Builder, clang::CharUnits::fromQuantity(), clang::CodeGen::AggValueSlot::getAddr(), clang::ASTContext::getBaseElementType(), clang::CodeGen::CodeGenFunction::getContext(), clang::CodeGen::CodeGenFunction::getLangOpts(), GetNumNonZeroBytesInInit(), clang::CharUnits::getQuantity(), clang::Expr::getType(), clang::ASTContext::getTypeInfoInChars(), clang::CXXRecordDecl::hasUserDeclaredConstructor(), clang::CodeGen::CodeGenTypeCache::Int8PtrTy, clang::CodeGen::AggValueSlot::isVolatile(), clang::CodeGen::AggValueSlot::isZeroed(), and clang::CodeGen::AggValueSlot::setZeroed().

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

static Expr* findPeephole	(	Expr *	op,
		CastKind	kind
	)		[static]

Attempt to look through various unimportant expressions to find a cast of the given kind.

Definition at line 550 of file CGExprAgg.cpp.

References clang::CK_NoOp, and clang::Expr::IgnoreParens().

static CharUnits GetNumNonZeroBytesInInit	(	const Expr *	E,
		CodeGenFunction &	CGF
	)		[static]

GetNumNonZeroBytesInInit - Get an approximate count of the number of non-zero bytes that will be stored when outputting the initializer for the specified initializer expression.

Definition at line 1273 of file CGExprAgg.cpp.

References clang::Type::getAs(), clang::CodeGen::CodeGenFunction::getContext(), clang::InitListExpr::getInit(), clang::InitListExpr::getNumInits(), clang::TargetInfo::getPointerWidth(), clang::CodeGen::CodeGenFunction::getTarget(), clang::Expr::getType(), clang::ValueDecl::getType(), clang::CodeGen::CodeGenFunction::getTypes(), clang::ASTContext::getTypeSizeInChars(), clang::Expr::IgnoreParens(), clang::Type::isIncompleteArrayType(), clang::Type::isReferenceType(), isSimpleZero(), clang::FieldDecl::isUnnamedBitfield(), clang::CodeGen::CodeGenTypes::isZeroInitializable(), clang::ASTContext::toCharUnitsFromBits(), and clang::CharUnits::Zero().

Referenced by CheckAggExprForMemSetUse().

static bool isBlockVarRef

(

const Expr *

E

)

[static]

Is the value of the given expression possibly a reference to or into a __block variable?

Definition at line 778 of file CGExprAgg.cpp.

References clang::BO_Comma, clang::CK_LValueToRValue, clang::Decl::hasAttr(), and clang::Expr::IgnoreParens().

static bool isSimpleZero	(	const Expr *	E,
		CodeGenFunction &	CGF
	)		[static]

isSimpleZero - If emitting this value will obviously just cause a store of zero to memory, return true. This can return false if uncertain, so it just handles simple cases.

Definition at line 1011 of file CGExprAgg.cpp.

References clang::CK_NullToPointer, clang::Expr::getType(), clang::CodeGen::CodeGenFunction::getTypes(), clang::Expr::IgnoreParens(), and clang::CodeGen::CodeGenTypes::isZeroInitializable().

Referenced by GetNumNonZeroBytesInInit().

static bool isTrivialFiller

(

Expr *

E

)

[static]

Determine if E is a trivial array filler, that is, one that is equivalent to zero-initialization.

Definition at line 375 of file CGExprAgg.cpp.