llvm::ObjectSizeOffsetVisitor Class Reference

Evaluate the size and offset of an object pointed to by a Value* statically. Fails if size or offset are not known at compile time. More...

#include <MemoryBuiltins.h>

Inheritance diagram for llvm::ObjectSizeOffsetVisitor:

Collaboration diagram for llvm::ObjectSizeOffsetVisitor:

List of all members.

Public Member Functions
	ObjectSizeOffsetVisitor (const DataLayout *DL, const TargetLibraryInfo *TLI, LLVMContext &Context, bool RoundToAlign=false)
SizeOffsetType	compute (Value *V)
bool	knownSize (SizeOffsetType &SizeOffset)
bool	knownOffset (SizeOffsetType &SizeOffset)
bool	bothKnown (SizeOffsetType &SizeOffset)
SizeOffsetType	visitAllocaInst (AllocaInst &I)
SizeOffsetType	visitArgument (Argument &A)
SizeOffsetType	visitCallSite (CallSite CS)
SizeOffsetType	visitConstantPointerNull (ConstantPointerNull &)
SizeOffsetType	visitExtractElementInst (ExtractElementInst &I)
SizeOffsetType	visitExtractValueInst (ExtractValueInst &I)
SizeOffsetType	visitGEPOperator (GEPOperator &GEP)
SizeOffsetType	visitGlobalAlias (GlobalAlias &GA)
SizeOffsetType	visitGlobalVariable (GlobalVariable &GV)
SizeOffsetType	visitIntToPtrInst (IntToPtrInst &)
SizeOffsetType	visitLoadInst (LoadInst &I)
SizeOffsetType	visitPHINode (PHINode &)
SizeOffsetType	visitSelectInst (SelectInst &I)
SizeOffsetType	visitUndefValue (UndefValue &)
SizeOffsetType	visitInstruction (Instruction &I)

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Detailed Description

Evaluate the size and offset of an object pointed to by a Value* statically. Fails if size or offset are not known at compile time.

Definition at line 159 of file MemoryBuiltins.h.

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Constructor & Destructor Documentation

ObjectSizeOffsetVisitor::ObjectSizeOffsetVisitor	(	const DataLayout *	DL,
		const TargetLibraryInfo *	TLI,
		LLVMContext &	Context,
		bool	RoundToAlign = false
	)

Definition at line 398 of file MemoryBuiltins.cpp.

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Member Function Documentation

bool llvm::ObjectSizeOffsetVisitor::bothKnown

(

SizeOffsetType &

SizeOffset

)

[inline]

Definition at line 189 of file MemoryBuiltins.h.

References knownOffset(), and knownSize().

Referenced by visitGEPOperator(), and visitSelectInst().

SizeOffsetType ObjectSizeOffsetVisitor::compute

(

Value *

V

)

Definition at line 407 of file MemoryBuiltins.cpp.

References llvm::ARM_PROC::A, llvm::WinEH::CE, llvm::dbgs(), DEBUG, llvm::APInt::getNullValue(), llvm::DataLayout::getPointerTypeSizeInBits(), llvm::Value::getType(), I, llvm::SmallPtrSetImpl< PtrType >::insert(), llvm::InstVisitor< ObjectSizeOffsetVisitor, SizeOffsetType >::IntToPtr, P, llvm::Value::stripPointerCasts(), llvm::InstVisitor< ObjectSizeOffsetVisitor, SizeOffsetType >::visit(), visitArgument(), visitConstantPointerNull(), visitGEPOperator(), visitGlobalAlias(), visitGlobalVariable(), and visitUndefValue().

Referenced by llvm::getObjectSize(), visitGEPOperator(), visitGlobalAlias(), and visitSelectInst().

bool llvm::ObjectSizeOffsetVisitor::knownOffset

(

SizeOffsetType &

SizeOffset

)

[inline]

Definition at line 185 of file MemoryBuiltins.h.

Referenced by bothKnown().

bool llvm::ObjectSizeOffsetVisitor::knownSize

(

SizeOffsetType &

SizeOffset

)

[inline]

Definition at line 181 of file MemoryBuiltins.h.

Referenced by bothKnown().

SizeOffsetType ObjectSizeOffsetVisitor::visitAllocaInst

(

AllocaInst &

I

)

Reimplemented from llvm::InstVisitor< ObjectSizeOffsetVisitor, SizeOffsetType >.

Definition at line 444 of file MemoryBuiltins.cpp.

References llvm::CallingConv::C, llvm::AllocaInst::getAlignment(), llvm::AllocaInst::getAllocatedType(), llvm::AllocaInst::getArraySize(), llvm::DataLayout::getTypeAllocSize(), llvm::AllocaInst::isArrayAllocation(), and llvm::Type::isSized().

SizeOffsetType ObjectSizeOffsetVisitor::visitArgument

(

Argument &

A

)

Definition at line 460 of file MemoryBuiltins.cpp.

References llvm::SequentialType::getElementType(), llvm::Argument::getParamAlignment(), llvm::Value::getType(), llvm::DataLayout::getTypeAllocSize(), and llvm::Argument::hasByValOrInAllocaAttr().

Referenced by compute().

SizeOffsetType ObjectSizeOffsetVisitor::visitCallSite

(

CallSite

CS

)

Reimplemented from llvm::InstVisitor< ObjectSizeOffsetVisitor, SizeOffsetType >.

Definition at line 471 of file MemoryBuiltins.cpp.

References AllocFnsTy::AllocTy, AnyAlloc, llvm::dyn_cast(), AllocFnsTy::FstParam, getAllocationData(), llvm::CallSiteBase< FunTy, ValTy, UserTy, InstrTy, CallTy, InvokeTy, IterTy >::getArgument(), llvm::CallSiteBase< FunTy, ValTy, UserTy, InstrTy, CallTy, InvokeTy, IterTy >::getInstruction(), llvm::GetStringLength(), llvm::ConstantInt::getValue(), AllocFnsTy::SndParam, StrDupLike, llvm::APInt::ugt(), and llvm::APInt::zextOrSelf().

SizeOffsetType ObjectSizeOffsetVisitor::visitConstantPointerNull

(

ConstantPointerNull &

)

Definition at line 522 of file MemoryBuiltins.cpp.

Referenced by compute().

SizeOffsetType ObjectSizeOffsetVisitor::visitExtractElementInst

(

ExtractElementInst &

I

)

Reimplemented from llvm::InstVisitor< ObjectSizeOffsetVisitor, SizeOffsetType >.

Definition at line 527 of file MemoryBuiltins.cpp.

SizeOffsetType ObjectSizeOffsetVisitor::visitExtractValueInst

(

ExtractValueInst &

I

)

Reimplemented from llvm::InstVisitor< ObjectSizeOffsetVisitor, SizeOffsetType >.

Definition at line 532 of file MemoryBuiltins.cpp.

SizeOffsetType ObjectSizeOffsetVisitor::visitGEPOperator

(

GEPOperator &

GEP

)

Definition at line 537 of file MemoryBuiltins.cpp.

References llvm::GEPOperator::accumulateConstantOffset(), bothKnown(), compute(), and llvm::GEPOperator::getPointerOperand().

Referenced by compute().

SizeOffsetType ObjectSizeOffsetVisitor::visitGlobalAlias

(

GlobalAlias &

GA

)

Definition at line 546 of file MemoryBuiltins.cpp.

References compute(), llvm::GlobalAlias::getAliasee(), and llvm::GlobalValue::mayBeOverridden().

Referenced by compute().

SizeOffsetType ObjectSizeOffsetVisitor::visitGlobalVariable

(

GlobalVariable &

GV

)

Definition at line 552 of file MemoryBuiltins.cpp.

References llvm::GlobalObject::getAlignment(), llvm::SequentialType::getElementType(), llvm::GlobalValue::getType(), llvm::DataLayout::getTypeAllocSize(), and llvm::GlobalVariable::hasDefinitiveInitializer().

Referenced by compute().

SizeOffsetType ObjectSizeOffsetVisitor::visitInstruction

(

Instruction &

I

)

Reimplemented from llvm::InstVisitor< ObjectSizeOffsetVisitor, SizeOffsetType >.

Definition at line 587 of file MemoryBuiltins.cpp.

References llvm::dbgs(), and DEBUG.

SizeOffsetType ObjectSizeOffsetVisitor::visitIntToPtrInst

(

IntToPtrInst &

)

Reimplemented from llvm::InstVisitor< ObjectSizeOffsetVisitor, SizeOffsetType >.

Definition at line 560 of file MemoryBuiltins.cpp.

SizeOffsetType ObjectSizeOffsetVisitor::visitLoadInst

(

LoadInst &

I

)

Reimplemented from llvm::InstVisitor< ObjectSizeOffsetVisitor, SizeOffsetType >.

Definition at line 565 of file MemoryBuiltins.cpp.

SizeOffsetType ObjectSizeOffsetVisitor::visitPHINode

(

PHINode &

)

Reimplemented from llvm::InstVisitor< ObjectSizeOffsetVisitor, SizeOffsetType >.

Definition at line 570 of file MemoryBuiltins.cpp.

SizeOffsetType ObjectSizeOffsetVisitor::visitSelectInst

(

SelectInst &

I

)

Reimplemented from llvm::InstVisitor< ObjectSizeOffsetVisitor, SizeOffsetType >.

Definition at line 575 of file MemoryBuiltins.cpp.

References bothKnown(), compute(), llvm::SelectInst::getFalseValue(), and llvm::SelectInst::getTrueValue().

SizeOffsetType ObjectSizeOffsetVisitor::visitUndefValue

(

UndefValue &

)

Definition at line 583 of file MemoryBuiltins.cpp.

Referenced by compute().

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The documentation for this class was generated from the following files:

• MemoryBuiltins.h
• MemoryBuiltins.cpp