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Changes (* location in pointer variables, avoiding include, and using APInt::getLimitedValue) based on feedback to r85814 

llvm-svn: 85933
This commit is contained in:
Victor Hernandez 2009-11-03 20:02:35 +00:00
parent e9d7d78ab3
commit 5cd73a3470
1 changed files with 34 additions and 39 deletions
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73
llvm/lib/Analysis/MemoryBuiltins.cpp
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@ -16,7 +16,6 @@
#include "llvm/Constants.h" #include "llvm/Constants.h"
#include "llvm/Instructions.h" #include "llvm/Instructions.h"
#include "llvm/Module.h" #include "llvm/Module.h"
#include "llvm/ADT/APInt.h"
#include "llvm/Analysis/ConstantFolding.h" #include "llvm/Analysis/ConstantFolding.h"
using namespace llvm; using namespace llvm;
@ -26,7 +25,7 @@ using namespace llvm;
/// isMalloc - Returns true if the the value is either a malloc call or a /// isMalloc - Returns true if the the value is either a malloc call or a
/// bitcast of the result of a malloc call. /// bitcast of the result of a malloc call.
bool llvm::isMalloc(const Value* I) { bool llvm::isMalloc(const Value *I) {
return extractMallocCall(I) || extractMallocCallFromBitCast(I); return extractMallocCall(I) || extractMallocCallFromBitCast(I);
} }
@ -34,7 +33,7 @@ static bool isMallocCall(const CallInst *CI) {
if (!CI) if (!CI)
return false; return false;
const Module* M = CI->getParent()->getParent()->getParent(); const Module *M = CI->getParent()->getParent()->getParent();
Function *MallocFunc = M->getFunction("malloc"); Function *MallocFunc = M->getFunction("malloc");
if (CI->getOperand(0) != MallocFunc) if (CI->getOperand(0) != MallocFunc)
@ -58,17 +57,17 @@ static bool isMallocCall(const CallInst *CI) {
/// extractMallocCall - Returns the corresponding CallInst if the instruction /// extractMallocCall - Returns the corresponding CallInst if the instruction
/// is a malloc call. Since CallInst::CreateMalloc() only creates calls, we /// is a malloc call. Since CallInst::CreateMalloc() only creates calls, we
/// ignore InvokeInst here. /// ignore InvokeInst here.
const CallInst* llvm::extractMallocCall(const Value* I) { const CallInst *llvm::extractMallocCall(const Value *I) {
const CallInst *CI = dyn_cast<CallInst>(I); const CallInst *CI = dyn_cast<CallInst>(I);
return (isMallocCall(CI)) ? CI : NULL; return (isMallocCall(CI)) ? CI : NULL;
} }
CallInst* llvm::extractMallocCall(Value* I) { CallInst *llvm::extractMallocCall(Value *I) {
CallInst *CI = dyn_cast<CallInst>(I); CallInst *CI = dyn_cast<CallInst>(I);
return (isMallocCall(CI)) ? CI : NULL; return (isMallocCall(CI)) ? CI : NULL;
} }
static bool isBitCastOfMallocCall(const BitCastInst* BCI) { static bool isBitCastOfMallocCall(const BitCastInst *BCI) {
if (!BCI) if (!BCI)
return false; return false;
@ -77,13 +76,13 @@ static bool isBitCastOfMallocCall(const BitCastInst* BCI) {
/// extractMallocCallFromBitCast - Returns the corresponding CallInst if the /// extractMallocCallFromBitCast - Returns the corresponding CallInst if the
/// instruction is a bitcast of the result of a malloc call. /// instruction is a bitcast of the result of a malloc call.
CallInst* llvm::extractMallocCallFromBitCast(Value* I) { CallInst *llvm::extractMallocCallFromBitCast(Value *I) {
BitCastInst *BCI = dyn_cast<BitCastInst>(I); BitCastInst *BCI = dyn_cast<BitCastInst>(I);
return (isBitCastOfMallocCall(BCI)) ? cast<CallInst>(BCI->getOperand(0)) return (isBitCastOfMallocCall(BCI)) ? cast<CallInst>(BCI->getOperand(0))
: NULL; : NULL;
} }
const CallInst* llvm::extractMallocCallFromBitCast(const Value* I) { const CallInst *llvm::extractMallocCallFromBitCast(const Value *I) {
const BitCastInst *BCI = dyn_cast<BitCastInst>(I); const BitCastInst *BCI = dyn_cast<BitCastInst>(I);
return (isBitCastOfMallocCall(BCI)) ? cast<CallInst>(BCI->getOperand(0)) return (isBitCastOfMallocCall(BCI)) ? cast<CallInst>(BCI->getOperand(0))
: NULL; : NULL;
@ -94,21 +93,21 @@ static bool isConstantOne(Value *val) {
return isa<ConstantInt>(val) && cast<ConstantInt>(val)->isOne(); return isa<ConstantInt>(val) && cast<ConstantInt>(val)->isOne();
} }
static Value* isArrayMallocHelper(const CallInst *CI, LLVMContext &Context, static Value *isArrayMallocHelper(const CallInst *CI, LLVMContext &Context,
const TargetData* TD) { const TargetData *TD) {
if (!CI) if (!CI)
return NULL; return NULL;
// Type must be known to determine array size. // Type must be known to determine array size.
const Type* T = getMallocAllocatedType(CI); const Type *T = getMallocAllocatedType(CI);
if (!T) if (!T)
return NULL; return NULL;
Value* MallocArg = CI->getOperand(1); Value *MallocArg = CI->getOperand(1);
ConstantExpr* CO = dyn_cast<ConstantExpr>(MallocArg); ConstantExpr *CO = dyn_cast<ConstantExpr>(MallocArg);
BinaryOperator* BO = dyn_cast<BinaryOperator>(MallocArg); BinaryOperator *BO = dyn_cast<BinaryOperator>(MallocArg);
Constant* ElementSize = ConstantExpr::getSizeOf(T); Constant *ElementSize = ConstantExpr::getSizeOf(T);
ElementSize = ConstantExpr::getTruncOrBitCast(ElementSize, ElementSize = ConstantExpr::getTruncOrBitCast(ElementSize,
MallocArg->getType()); MallocArg->getType());
Constant *FoldedElementSize = Constant *FoldedElementSize =
@ -128,8 +127,8 @@ static Value* isArrayMallocHelper(const CallInst *CI, LLVMContext &Context,
if (!CO && !BO) if (!CO && !BO)
return NULL; return NULL;
Value* Op0 = NULL; Value *Op0 = NULL;
Value* Op1 = NULL; Value *Op1 = NULL;
unsigned Opcode = 0; unsigned Opcode = 0;
if (CO && ((CO->getOpcode() == Instruction::Mul) || if (CO && ((CO->getOpcode() == Instruction::Mul) ||
(CO->getOpcode() == Instruction::Shl))) { (CO->getOpcode() == Instruction::Shl))) {
@ -157,17 +156,13 @@ static Value* isArrayMallocHelper(const CallInst *CI, LLVMContext &Context,
return Op1; return Op1;
} }
if (Opcode == Instruction::Shl) { if (Opcode == Instruction::Shl) {
ConstantInt* Op1CI = dyn_cast<ConstantInt>(Op1); ConstantInt *Op1CI = dyn_cast<ConstantInt>(Op1);
if (!Op1CI) return NULL; if (!Op1CI) return NULL;
APInt Op1Int = Op1CI->getValue(); APInt Op1Int = Op1CI->getValue();
unsigned Op1Width = Op1Int.getBitWidth(); uint64_t BitToSet = Op1Int.getLimitedValue(Op1Int.getBitWidth() - 1);
// check for overflow Value *Op1Pow = ConstantInt::get(Context,
if (Op1Int.getActiveBits() > 64 || Op1Int.getZExtValue() > Op1Width) APInt(Op1Int.getBitWidth(), 0).set(BitToSet));
return NULL;
Value* Op1Pow = ConstantInt::get(Context,
APInt(Op1Width, 0).set(Op1Int.getZExtValue()));
if (Op0 == ElementSize || (FoldedElementSize && Op0 == FoldedElementSize)) if (Op0 == ElementSize || (FoldedElementSize && Op0 == FoldedElementSize))
// ArraySize << log2(ElementSize) // ArraySize << log2(ElementSize)
return Op1Pow; return Op1Pow;
@ -185,10 +180,10 @@ static Value* isArrayMallocHelper(const CallInst *CI, LLVMContext &Context,
/// isArrayMalloc - Returns the corresponding CallInst if the instruction /// isArrayMalloc - Returns the corresponding CallInst if the instruction
/// is a call to malloc whose array size can be determined and the array size /// is a call to malloc whose array size can be determined and the array size
/// is not constant 1. Otherwise, return NULL. /// is not constant 1. Otherwise, return NULL.
CallInst* llvm::isArrayMalloc(Value* I, LLVMContext &Context, CallInst *llvm::isArrayMalloc(Value *I, LLVMContext &Context,
const TargetData* TD) { const TargetData *TD) {
CallInst *CI = extractMallocCall(I); CallInst *CI = extractMallocCall(I);
Value* ArraySize = isArrayMallocHelper(CI, Context, TD); Value *ArraySize = isArrayMallocHelper(CI, Context, TD);
if (ArraySize && if (ArraySize &&
ArraySize != ConstantInt::get(CI->getOperand(1)->getType(), 1)) ArraySize != ConstantInt::get(CI->getOperand(1)->getType(), 1))
@ -198,10 +193,10 @@ CallInst* llvm::isArrayMalloc(Value* I, LLVMContext &Context,
return NULL; return NULL;
} }
const CallInst* llvm::isArrayMalloc(const Value* I, LLVMContext &Context, const CallInst *llvm::isArrayMalloc(const Value *I, LLVMContext &Context,
const TargetData* TD) { const TargetData *TD) {
const CallInst *CI = extractMallocCall(I); const CallInst *CI = extractMallocCall(I);
Value* ArraySize = isArrayMallocHelper(CI, Context, TD); Value *ArraySize = isArrayMallocHelper(CI, Context, TD);
if (ArraySize && if (ArraySize &&
ArraySize != ConstantInt::get(CI->getOperand(1)->getType(), 1)) ArraySize != ConstantInt::get(CI->getOperand(1)->getType(), 1))
@ -214,10 +209,10 @@ const CallInst* llvm::isArrayMalloc(const Value* I, LLVMContext &Context,
/// getMallocType - Returns the PointerType resulting from the malloc call. /// getMallocType - Returns the PointerType resulting from the malloc call.
/// This PointerType is the result type of the call's only bitcast use. /// This PointerType is the result type of the call's only bitcast use.
/// If there is no unique bitcast use, then return NULL. /// If there is no unique bitcast use, then return NULL.
const PointerType* llvm::getMallocType(const CallInst* CI) { const PointerType *llvm::getMallocType(const CallInst *CI) {
assert(isMalloc(CI) && "GetMallocType and not malloc call"); assert(isMalloc(CI) && "GetMallocType and not malloc call");
const BitCastInst* BCI = NULL; const BitCastInst *BCI = NULL;
// Determine if CallInst has a bitcast use. // Determine if CallInst has a bitcast use.
for (Value::use_const_iterator UI = CI->use_begin(), E = CI->use_end(); for (Value::use_const_iterator UI = CI->use_begin(), E = CI->use_end();
@ -241,8 +236,8 @@ const PointerType* llvm::getMallocType(const CallInst* CI) {
/// getMallocAllocatedType - Returns the Type allocated by malloc call. This /// getMallocAllocatedType - Returns the Type allocated by malloc call. This
/// Type is the result type of the call's only bitcast use. If there is no /// Type is the result type of the call's only bitcast use. If there is no
/// unique bitcast use, then return NULL. /// unique bitcast use, then return NULL.
const Type* llvm::getMallocAllocatedType(const CallInst* CI) { const Type *llvm::getMallocAllocatedType(const CallInst *CI) {
const PointerType* PT = getMallocType(CI); const PointerType *PT = getMallocType(CI);
return PT ? PT->getElementType() : NULL; return PT ? PT->getElementType() : NULL;
} }
@ -251,8 +246,8 @@ const Type* llvm::getMallocAllocatedType(const CallInst* CI) {
/// then return that multiple. For non-array mallocs, the multiple is /// then return that multiple. For non-array mallocs, the multiple is
/// constant 1. Otherwise, return NULL for mallocs whose array size cannot be /// constant 1. Otherwise, return NULL for mallocs whose array size cannot be
/// determined. /// determined.
Value* llvm::getMallocArraySize(CallInst* CI, LLVMContext &Context, Value *llvm::getMallocArraySize(CallInst *CI, LLVMContext &Context,
const TargetData* TD) { const TargetData *TD) {
return isArrayMallocHelper(CI, Context, TD); return isArrayMallocHelper(CI, Context, TD);
} }
@ -261,12 +256,12 @@ Value* llvm::getMallocArraySize(CallInst* CI, LLVMContext &Context,
// //
/// isFreeCall - Returns true if the the value is a call to the builtin free() /// isFreeCall - Returns true if the the value is a call to the builtin free()
bool llvm::isFreeCall(const Value* I) { bool llvm::isFreeCall(const Value *I) {
const CallInst *CI = dyn_cast<CallInst>(I); const CallInst *CI = dyn_cast<CallInst>(I);
if (!CI) if (!CI)
return false; return false;
const Module* M = CI->getParent()->getParent()->getParent(); const Module *M = CI->getParent()->getParent()->getParent();
Function *FreeFunc = M->getFunction("free"); Function *FreeFunc = M->getFunction("free");
if (CI->getOperand(0) != FreeFunc) if (CI->getOperand(0) != FreeFunc)