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-rw-r--r--contrib/llvm/lib/Analysis/MemoryBuiltins.cpp114
1 files changed, 67 insertions, 47 deletions
diff --git a/contrib/llvm/lib/Analysis/MemoryBuiltins.cpp b/contrib/llvm/lib/Analysis/MemoryBuiltins.cpp
index 9c0d8ac..1db0f63 100644
--- a/contrib/llvm/lib/Analysis/MemoryBuiltins.cpp
+++ b/contrib/llvm/lib/Analysis/MemoryBuiltins.cpp
@@ -31,12 +31,13 @@
using namespace llvm;
enum AllocType {
- MallocLike = 1<<0, // allocates
- CallocLike = 1<<1, // allocates + bzero
- ReallocLike = 1<<2, // reallocates
- StrDupLike = 1<<3,
+ OpNewLike = 1<<0, // allocates; never returns null
+ MallocLike = 1<<1 | OpNewLike, // allocates; may return null
+ CallocLike = 1<<2, // allocates + bzero
+ ReallocLike = 1<<3, // reallocates
+ StrDupLike = 1<<4,
AllocLike = MallocLike | CallocLike | StrDupLike,
- AnyAlloc = MallocLike | CallocLike | ReallocLike | StrDupLike
+ AnyAlloc = AllocLike | ReallocLike
};
struct AllocFnsTy {
@@ -52,20 +53,20 @@ struct AllocFnsTy {
static const AllocFnsTy AllocationFnData[] = {
{LibFunc::malloc, MallocLike, 1, 0, -1},
{LibFunc::valloc, MallocLike, 1, 0, -1},
- {LibFunc::Znwj, MallocLike, 1, 0, -1}, // new(unsigned int)
+ {LibFunc::Znwj, OpNewLike, 1, 0, -1}, // new(unsigned int)
{LibFunc::ZnwjRKSt9nothrow_t, MallocLike, 2, 0, -1}, // new(unsigned int, nothrow)
- {LibFunc::Znwm, MallocLike, 1, 0, -1}, // new(unsigned long)
+ {LibFunc::Znwm, OpNewLike, 1, 0, -1}, // new(unsigned long)
{LibFunc::ZnwmRKSt9nothrow_t, MallocLike, 2, 0, -1}, // new(unsigned long, nothrow)
- {LibFunc::Znaj, MallocLike, 1, 0, -1}, // new[](unsigned int)
+ {LibFunc::Znaj, OpNewLike, 1, 0, -1}, // new[](unsigned int)
{LibFunc::ZnajRKSt9nothrow_t, MallocLike, 2, 0, -1}, // new[](unsigned int, nothrow)
- {LibFunc::Znam, MallocLike, 1, 0, -1}, // new[](unsigned long)
+ {LibFunc::Znam, OpNewLike, 1, 0, -1}, // new[](unsigned long)
{LibFunc::ZnamRKSt9nothrow_t, MallocLike, 2, 0, -1}, // new[](unsigned long, nothrow)
- {LibFunc::posix_memalign, MallocLike, 3, 2, -1},
{LibFunc::calloc, CallocLike, 2, 0, 1},
{LibFunc::realloc, ReallocLike, 2, 1, -1},
{LibFunc::reallocf, ReallocLike, 2, 1, -1},
{LibFunc::strdup, StrDupLike, 1, -1, -1},
{LibFunc::strndup, StrDupLike, 2, 1, -1}
+ // TODO: Handle "int posix_memalign(void **, size_t, size_t)"
};
@@ -77,6 +78,9 @@ static Function *getCalledFunction(const Value *V, bool LookThroughBitCast) {
if (!CS.getInstruction())
return 0;
+ if (CS.isNoBuiltin())
+ return 0;
+
Function *Callee = CS.getCalledFunction();
if (!Callee || !Callee->isDeclaration())
return 0;
@@ -114,7 +118,7 @@ static const AllocFnsTy *getAllocationData(const Value *V, AllocType AllocTy,
return 0;
const AllocFnsTy *FnData = &AllocationFnData[i];
- if ((FnData->AllocTy & AllocTy) == 0)
+ if ((FnData->AllocTy & AllocTy) != FnData->AllocTy)
return 0;
// Check function prototype.
@@ -186,6 +190,13 @@ bool llvm::isReallocLikeFn(const Value *V, const TargetLibraryInfo *TLI,
return getAllocationData(V, ReallocLike, TLI, LookThroughBitCast);
}
+/// \brief Tests if a value is a call or invoke to a library function that
+/// allocates memory and never returns null (such as operator new).
+bool llvm::isOperatorNewLikeFn(const Value *V, const TargetLibraryInfo *TLI,
+ bool LookThroughBitCast) {
+ return getAllocationData(V, OpNewLike, TLI, LookThroughBitCast);
+}
+
/// extractMallocCall - Returns the corresponding CallInst if the instruction
/// is a malloc call. Since CallInst::CreateMalloc() only creates calls, we
/// ignore InvokeInst here.
@@ -194,7 +205,7 @@ const CallInst *llvm::extractMallocCall(const Value *I,
return isMallocLikeFn(I, TLI) ? dyn_cast<CallInst>(I) : 0;
}
-static Value *computeArraySize(const CallInst *CI, const DataLayout *TD,
+static Value *computeArraySize(const CallInst *CI, const DataLayout *DL,
const TargetLibraryInfo *TLI,
bool LookThroughSExt = false) {
if (!CI)
@@ -202,12 +213,12 @@ static Value *computeArraySize(const CallInst *CI, const DataLayout *TD,
// The size of the malloc's result type must be known to determine array size.
Type *T = getMallocAllocatedType(CI, TLI);
- if (!T || !T->isSized() || !TD)
+ if (!T || !T->isSized() || !DL)
return 0;
- unsigned ElementSize = TD->getTypeAllocSize(T);
+ unsigned ElementSize = DL->getTypeAllocSize(T);
if (StructType *ST = dyn_cast<StructType>(T))
- ElementSize = TD->getStructLayout(ST)->getSizeInBytes();
+ ElementSize = DL->getStructLayout(ST)->getSizeInBytes();
// If malloc call's arg can be determined to be a multiple of ElementSize,
// return the multiple. Otherwise, return NULL.
@@ -224,10 +235,10 @@ static Value *computeArraySize(const CallInst *CI, const DataLayout *TD,
/// is a call to malloc whose array size can be determined and the array size
/// is not constant 1. Otherwise, return NULL.
const CallInst *llvm::isArrayMalloc(const Value *I,
- const DataLayout *TD,
+ const DataLayout *DL,
const TargetLibraryInfo *TLI) {
const CallInst *CI = extractMallocCall(I, TLI);
- Value *ArraySize = computeArraySize(CI, TD, TLI);
+ Value *ArraySize = computeArraySize(CI, DL, TLI);
if (ConstantInt *ConstSize = dyn_cast_or_null<ConstantInt>(ArraySize))
if (ConstSize->isOne())
@@ -285,11 +296,11 @@ Type *llvm::getMallocAllocatedType(const CallInst *CI,
/// then return that multiple. For non-array mallocs, the multiple is
/// constant 1. Otherwise, return NULL for mallocs whose array size cannot be
/// determined.
-Value *llvm::getMallocArraySize(CallInst *CI, const DataLayout *TD,
+Value *llvm::getMallocArraySize(CallInst *CI, const DataLayout *DL,
const TargetLibraryInfo *TLI,
bool LookThroughSExt) {
assert(isMallocLikeFn(CI, TLI) && "getMallocArraySize and not malloc call");
- return computeArraySize(CI, TD, TLI, LookThroughSExt);
+ return computeArraySize(CI, DL, TLI, LookThroughSExt);
}
@@ -315,9 +326,15 @@ const CallInst *llvm::isFreeCall(const Value *I, const TargetLibraryInfo *TLI) {
if (!TLI || !TLI->getLibFunc(FnName, TLIFn) || !TLI->has(TLIFn))
return 0;
- if (TLIFn != LibFunc::free &&
- TLIFn != LibFunc::ZdlPv && // operator delete(void*)
- TLIFn != LibFunc::ZdaPv) // operator delete[](void*)
+ unsigned ExpectedNumParams;
+ if (TLIFn == LibFunc::free ||
+ TLIFn == LibFunc::ZdlPv || // operator delete(void*)
+ TLIFn == LibFunc::ZdaPv) // operator delete[](void*)
+ ExpectedNumParams = 1;
+ else if (TLIFn == LibFunc::ZdlPvRKSt9nothrow_t || // delete(void*, nothrow)
+ TLIFn == LibFunc::ZdaPvRKSt9nothrow_t) // delete[](void*, nothrow)
+ ExpectedNumParams = 2;
+ else
return 0;
// Check free prototype.
@@ -326,7 +343,7 @@ const CallInst *llvm::isFreeCall(const Value *I, const TargetLibraryInfo *TLI) {
FunctionType *FTy = Callee->getFunctionType();
if (!FTy->getReturnType()->isVoidTy())
return 0;
- if (FTy->getNumParams() != 1)
+ if (FTy->getNumParams() != ExpectedNumParams)
return 0;
if (FTy->getParamType(0) != Type::getInt8PtrTy(Callee->getContext()))
return 0;
@@ -345,12 +362,12 @@ const CallInst *llvm::isFreeCall(const Value *I, const TargetLibraryInfo *TLI) {
/// object size in Size if successful, and false otherwise.
/// If RoundToAlign is true, then Size is rounded up to the aligment of allocas,
/// byval arguments, and global variables.
-bool llvm::getObjectSize(const Value *Ptr, uint64_t &Size, const DataLayout *TD,
+bool llvm::getObjectSize(const Value *Ptr, uint64_t &Size, const DataLayout *DL,
const TargetLibraryInfo *TLI, bool RoundToAlign) {
- if (!TD)
+ if (!DL)
return false;
- ObjectSizeOffsetVisitor Visitor(TD, TLI, Ptr->getContext(), RoundToAlign);
+ ObjectSizeOffsetVisitor Visitor(DL, TLI, Ptr->getContext(), RoundToAlign);
SizeOffsetType Data = Visitor.compute(const_cast<Value*>(Ptr));
if (!Visitor.bothKnown(Data))
return false;
@@ -377,12 +394,12 @@ APInt ObjectSizeOffsetVisitor::align(APInt Size, uint64_t Align) {
return Size;
}
-ObjectSizeOffsetVisitor::ObjectSizeOffsetVisitor(const DataLayout *TD,
+ObjectSizeOffsetVisitor::ObjectSizeOffsetVisitor(const DataLayout *DL,
const TargetLibraryInfo *TLI,
LLVMContext &Context,
bool RoundToAlign)
-: TD(TD), TLI(TLI), RoundToAlign(RoundToAlign) {
- IntegerType *IntTy = TD->getIntPtrType(Context);
+: DL(DL), TLI(TLI), RoundToAlign(RoundToAlign) {
+ IntegerType *IntTy = DL->getIntPtrType(Context);
IntTyBits = IntTy->getBitWidth();
Zero = APInt::getNullValue(IntTyBits);
}
@@ -425,7 +442,7 @@ SizeOffsetType ObjectSizeOffsetVisitor::visitAllocaInst(AllocaInst &I) {
if (!I.getAllocatedType()->isSized())
return unknown();
- APInt Size(IntTyBits, TD->getTypeAllocSize(I.getAllocatedType()));
+ APInt Size(IntTyBits, DL->getTypeAllocSize(I.getAllocatedType()));
if (!I.isArrayAllocation())
return std::make_pair(align(Size, I.getAlignment()), Zero);
@@ -444,7 +461,7 @@ SizeOffsetType ObjectSizeOffsetVisitor::visitArgument(Argument &A) {
return unknown();
}
PointerType *PT = cast<PointerType>(A.getType());
- APInt Size(IntTyBits, TD->getTypeAllocSize(PT->getElementType()));
+ APInt Size(IntTyBits, DL->getTypeAllocSize(PT->getElementType()));
return std::make_pair(align(Size, A.getParamAlignment()), Zero);
}
@@ -517,7 +534,7 @@ ObjectSizeOffsetVisitor::visitExtractValueInst(ExtractValueInst&) {
SizeOffsetType ObjectSizeOffsetVisitor::visitGEPOperator(GEPOperator &GEP) {
SizeOffsetType PtrData = compute(GEP.getPointerOperand());
APInt Offset(IntTyBits, 0);
- if (!bothKnown(PtrData) || !GEP.accumulateConstantOffset(*TD, Offset))
+ if (!bothKnown(PtrData) || !GEP.accumulateConstantOffset(*DL, Offset))
return unknown();
return std::make_pair(PtrData.first, PtrData.second + Offset);
@@ -533,7 +550,7 @@ SizeOffsetType ObjectSizeOffsetVisitor::visitGlobalVariable(GlobalVariable &GV){
if (!GV.hasDefinitiveInitializer())
return unknown();
- APInt Size(IntTyBits, TD->getTypeAllocSize(GV.getType()->getElementType()));
+ APInt Size(IntTyBits, DL->getTypeAllocSize(GV.getType()->getElementType()));
return std::make_pair(align(Size, GV.getAlignment()), Zero);
}
@@ -569,12 +586,13 @@ SizeOffsetType ObjectSizeOffsetVisitor::visitInstruction(Instruction &I) {
return unknown();
}
-
-ObjectSizeOffsetEvaluator::ObjectSizeOffsetEvaluator(const DataLayout *TD,
- const TargetLibraryInfo *TLI,
- LLVMContext &Context)
-: TD(TD), TLI(TLI), Context(Context), Builder(Context, TargetFolder(TD)) {
- IntTy = TD->getIntPtrType(Context);
+ObjectSizeOffsetEvaluator::ObjectSizeOffsetEvaluator(const DataLayout *DL,
+ const TargetLibraryInfo *TLI,
+ LLVMContext &Context,
+ bool RoundToAlign)
+: DL(DL), TLI(TLI), Context(Context), Builder(Context, TargetFolder(DL)),
+ RoundToAlign(RoundToAlign) {
+ IntTy = DL->getIntPtrType(Context);
Zero = ConstantInt::get(IntTy, 0);
}
@@ -598,7 +616,7 @@ SizeOffsetEvalType ObjectSizeOffsetEvaluator::compute(Value *V) {
}
SizeOffsetEvalType ObjectSizeOffsetEvaluator::compute_(Value *V) {
- ObjectSizeOffsetVisitor Visitor(TD, TLI, Context);
+ ObjectSizeOffsetVisitor Visitor(DL, TLI, Context, RoundToAlign);
SizeOffsetType Const = Visitor.compute(V);
if (Visitor.bothKnown(Const))
return std::make_pair(ConstantInt::get(Context, Const.first),
@@ -617,13 +635,15 @@ SizeOffsetEvalType ObjectSizeOffsetEvaluator::compute_(Value *V) {
if (Instruction *I = dyn_cast<Instruction>(V))
Builder.SetInsertPoint(I);
- // record the pointers that were handled in this run, so that they can be
- // cleaned later if something fails
- SeenVals.insert(V);
-
// now compute the size and offset
SizeOffsetEvalType Result;
- if (GEPOperator *GEP = dyn_cast<GEPOperator>(V)) {
+
+ // Record the pointers that were handled in this run, so that they can be
+ // cleaned later if something fails. We also use this set to break cycles that
+ // can occur in dead code.
+ if (!SeenVals.insert(V)) {
+ Result = unknown();
+ } else if (GEPOperator *GEP = dyn_cast<GEPOperator>(V)) {
Result = visitGEPOperator(*GEP);
} else if (Instruction *I = dyn_cast<Instruction>(V)) {
Result = visit(*I);
@@ -656,7 +676,7 @@ SizeOffsetEvalType ObjectSizeOffsetEvaluator::visitAllocaInst(AllocaInst &I) {
assert(I.isArrayAllocation());
Value *ArraySize = I.getArraySize();
Value *Size = ConstantInt::get(ArraySize->getType(),
- TD->getTypeAllocSize(I.getAllocatedType()));
+ DL->getTypeAllocSize(I.getAllocatedType()));
Size = Builder.CreateMul(Size, ArraySize);
return std::make_pair(Size, Zero);
}
@@ -708,7 +728,7 @@ ObjectSizeOffsetEvaluator::visitGEPOperator(GEPOperator &GEP) {
if (!bothKnown(PtrData))
return unknown();
- Value *Offset = EmitGEPOffset(&Builder, *TD, &GEP, /*NoAssumptions=*/true);
+ Value *Offset = EmitGEPOffset(&Builder, *DL, &GEP, /*NoAssumptions=*/true);
Offset = Builder.CreateAdd(PtrData.second, Offset);
return std::make_pair(PtrData.first, Offset);
}
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