PoisonChecking.cpp File Reference

#include "llvm/Transforms/Instrumentation/PoisonChecking.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/Support/CommandLine.h"

Go to the source code of this file.

Macros
#define	DEBUG_TYPE   "poison-checking"

Functions
static bool	isConstantFalse (Value *V)
static Value *	buildOrChain (IRBuilder<> &B, ArrayRef< Value * > Ops)
static void	generateCreationChecksForBinOp (Instruction &I, SmallVectorImpl< Value * > &Checks)
static void	generateCreationChecks (Instruction &I, SmallVectorImpl< Value * > &Checks)
	Given an instruction which can produce poison on non-poison inputs (i.e.
static Value *	getPoisonFor (DenseMap< Value *, Value * > &ValToPoison, Value *V)
static void	CreateAssert (IRBuilder<> &B, Value *Cond)
static void	CreateAssertNot (IRBuilder<> &B, Value *Cond)
static bool	rewrite (Function &F)

Variables
static cl::opt< bool >	LocalCheck ("poison-checking-function-local", cl::init(false), cl::desc("Check that returns are non-poison (for testing)"))

Macro Definition Documentation

DEBUG_TYPE

#define DEBUG_TYPE   "poison-checking"

Definition at line 69 of file PoisonChecking.cpp.

Function Documentation

buildOrChain()

static Value * buildOrChain ( IRBuilder<> &  B, ArrayRef< Value * >  Ops  )

static

Definition at line 84 of file PoisonChecking.cpp.

References B, llvm::drop_begin(), isConstantFalse(), and llvm::ArrayRef< T >::size().

Referenced by rewrite().

CreateAssert()

static void CreateAssert ( IRBuilder<> &  B, Value *  Cond  )

static

Definition at line 236 of file PoisonChecking.cpp.

References assert(), B, Cond, llvm::Type::getInt1Ty(), and llvm::Type::getVoidTy().

Referenced by CreateAssertNot().

CreateAssertNot()

static void CreateAssertNot ( IRBuilder<> &  B, Value *  Cond  )

static

Definition at line 250 of file PoisonChecking.cpp.

References assert(), B, Cond, and CreateAssert().

Referenced by rewrite().

generateCreationChecks()

static void generateCreationChecks ( Instruction &  I, SmallVectorImpl< Value * > &  Checks  )

static

Given an instruction which can produce poison on non-poison inputs (i.e.

canCreatePoison returns true), generate runtime checks to produce boolean indicators of when poison would result.

Definition at line 181 of file PoisonChecking.cpp.

References B, Check, generateCreationChecksForBinOp(), llvm::Value::getType(), I, Idx, and llvm::SmallVectorTemplateBase< T, bool >::push_back().

Referenced by rewrite().

generateCreationChecksForBinOp()

static void generateCreationChecksForBinOp ( Instruction &  I, SmallVectorImpl< Value * > &  Checks  )

static

Definition at line 98 of file PoisonChecking.cpp.

References assert(), B, Check, llvm::Type::getScalarSizeInBits(), llvm::Value::getType(), I, LHS, llvm::SmallVectorTemplateBase< T, bool >::push_back(), and RHS.

Referenced by generateCreationChecks().

getPoisonFor()

static Value * getPoisonFor ( DenseMap< Value *, Value * > &  ValToPoison, Value *  V  )

static

Definition at line 222 of file PoisonChecking.cpp.

References llvm::DenseMapBase< DerivedT, KeyT, ValueT, KeyInfoT, BucketT >::end(), llvm::DenseMapBase< DerivedT, KeyT, ValueT, KeyInfoT, BucketT >::find(), and llvm::ConstantInt::getFalse().

Referenced by rewrite().

isConstantFalse()

static bool isConstantFalse ( Value *  V )

static

Definition at line 77 of file PoisonChecking.cpp.

References assert().

Referenced by buildOrChain().

rewrite()

static bool rewrite ( Function &  F )

static

Definition at line 255 of file PoisonChecking.cpp.

References B, buildOrChain(), llvm::canCreatePoison(), llvm::DenseMapBase< DerivedT, KeyT, ValueT, KeyInfoT, BucketT >::count(), llvm::PHINode::Create(), CreateAssertNot(), F, generateCreationChecks(), llvm::UndefValue::get(), llvm::getGuaranteedNonPoisonOps(), llvm::Type::getInt1Ty(), getPoisonFor(), I, llvm::SmallPtrSetImpl< PtrType >::insert(), LocalCheck, llvm::propagatesPoison(), and llvm::SmallVectorTemplateBase< T, bool >::push_back().

Referenced by llvm::ScalarEvolution::getLosslessPtrToIntExpr(), and llvm::PoisonCheckingPass::run().

Variable Documentation

LocalCheck

cl::opt< bool > LocalCheck("poison-checking-function-local", cl::init(false), cl::desc("Check that returns are non-poison (for testing)")) ( "poison-checking-function-local"  , cl::init(false)  , cl::desc("Check that returns are non-poison (for testing)")    )

static

Referenced by rewrite().