//===----------------------------------------------------------------------===//
//
// This family of functions identifies calls to builtin functions that allocate
-// or free memory.
+// or free memory.
//
//===----------------------------------------------------------------------===//
-#define DEBUG_TYPE "memory-builtins"
-#include "llvm/ADT/Statistic.h"
-#include "llvm/ADT/STLExtras.h"
#include "llvm/Analysis/MemoryBuiltins.h"
-#include "llvm/GlobalVariable.h"
-#include "llvm/Instructions.h"
-#include "llvm/Intrinsics.h"
-#include "llvm/Metadata.h"
-#include "llvm/Module.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/Statistic.h"
+#include "llvm/Analysis/TargetLibraryInfo.h"
#include "llvm/Analysis/ValueTracking.h"
+#include "llvm/IR/DataLayout.h"
+#include "llvm/IR/GlobalVariable.h"
+#include "llvm/IR/Instructions.h"
+#include "llvm/IR/Intrinsics.h"
+#include "llvm/IR/Metadata.h"
+#include "llvm/IR/Module.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/raw_ostream.h"
-#include "llvm/Target/TargetData.h"
#include "llvm/Transforms/Utils/Local.h"
using namespace llvm;
-enum AllocType {
- MallocLike = 1<<0, // allocates
- CallocLike = 1<<1, // allocates + bzero
- ReallocLike = 1<<2, // reallocates
- StrDupLike = 1<<3,
+#define DEBUG_TYPE "memory-builtins"
+
+enum AllocType : uint8_t {
+ 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 {
- const char *Name;
+ LibFunc::Func Func;
AllocType AllocTy;
unsigned char NumParams;
// First and Second size parameters (or -1 if unused)
// FIXME: certain users need more information. E.g., SimplifyLibCalls needs to
// know which functions are nounwind, noalias, nocapture parameters, etc.
static const AllocFnsTy AllocationFnData[] = {
- {"malloc", MallocLike, 1, 0, -1},
- {"valloc", MallocLike, 1, 0, -1},
- {"_Znwj", MallocLike, 1, 0, -1}, // new(unsigned int)
- {"_ZnwjRKSt9nothrow_t", MallocLike, 2, 0, -1}, // new(unsigned int, nothrow)
- {"_Znwm", MallocLike, 1, 0, -1}, // new(unsigned long)
- {"_ZnwmRKSt9nothrow_t", MallocLike, 2, 0, -1}, // new(unsigned long, nothrow)
- {"_Znaj", MallocLike, 1, 0, -1}, // new[](unsigned int)
- {"_ZnajRKSt9nothrow_t", MallocLike, 2, 0, -1}, // new[](unsigned int, nothrow)
- {"_Znam", MallocLike, 1, 0, -1}, // new[](unsigned long)
- {"_ZnamRKSt9nothrow_t", MallocLike, 2, 0, -1}, // new[](unsigned long, nothrow)
- {"posix_memalign", MallocLike, 3, 2, -1},
- {"calloc", CallocLike, 2, 0, 1},
- {"realloc", ReallocLike, 2, 1, -1},
- {"reallocf", ReallocLike, 2, 1, -1},
- {"strdup", StrDupLike, 1, -1, -1},
- {"strndup", StrDupLike, 2, 1, -1}
+ {LibFunc::malloc, MallocLike, 1, 0, -1},
+ {LibFunc::valloc, MallocLike, 1, 0, -1},
+ {LibFunc::Znwj, OpNewLike, 1, 0, -1}, // new(unsigned int)
+ {LibFunc::ZnwjRKSt9nothrow_t, MallocLike, 2, 0, -1}, // new(unsigned int, nothrow)
+ {LibFunc::Znwm, OpNewLike, 1, 0, -1}, // new(unsigned long)
+ {LibFunc::ZnwmRKSt9nothrow_t, MallocLike, 2, 0, -1}, // new(unsigned long, nothrow)
+ {LibFunc::Znaj, OpNewLike, 1, 0, -1}, // new[](unsigned int)
+ {LibFunc::ZnajRKSt9nothrow_t, MallocLike, 2, 0, -1}, // new[](unsigned int, nothrow)
+ {LibFunc::Znam, OpNewLike, 1, 0, -1}, // new[](unsigned long)
+ {LibFunc::ZnamRKSt9nothrow_t, MallocLike, 2, 0, -1}, // new[](unsigned long, nothrow)
+ {LibFunc::msvc_new_int, OpNewLike, 1, 0, -1}, // new(unsigned int)
+ {LibFunc::msvc_new_int_nothrow, MallocLike, 2, 0, -1}, // new(unsigned int, nothrow)
+ {LibFunc::msvc_new_longlong, OpNewLike, 1, 0, -1}, // new(unsigned long long)
+ {LibFunc::msvc_new_longlong_nothrow, MallocLike, 2, 0, -1}, // new(unsigned long long, nothrow)
+ {LibFunc::msvc_new_array_int, OpNewLike, 1, 0, -1}, // new[](unsigned int)
+ {LibFunc::msvc_new_array_int_nothrow, MallocLike, 2, 0, -1}, // new[](unsigned int, nothrow)
+ {LibFunc::msvc_new_array_longlong, OpNewLike, 1, 0, -1}, // new[](unsigned long long)
+ {LibFunc::msvc_new_array_longlong_nothrow, MallocLike, 2, 0, -1}, // new[](unsigned long long, nothrow)
+ {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)"
};
CallSite CS(const_cast<Value*>(V));
if (!CS.getInstruction())
- return 0;
+ return nullptr;
+
+ if (CS.isNoBuiltin())
+ return nullptr;
Function *Callee = CS.getCalledFunction();
if (!Callee || !Callee->isDeclaration())
- return 0;
+ return nullptr;
return Callee;
}
/// \brief Returns the allocation data for the given value if it is a call to a
/// known allocation function, and NULL otherwise.
static const AllocFnsTy *getAllocationData(const Value *V, AllocType AllocTy,
+ const TargetLibraryInfo *TLI,
bool LookThroughBitCast = false) {
+ // Skip intrinsics
+ if (isa<IntrinsicInst>(V))
+ return nullptr;
+
Function *Callee = getCalledFunction(V, LookThroughBitCast);
if (!Callee)
- return 0;
-
- unsigned i = 0;
- bool found = false;
- for ( ; i < array_lengthof(AllocationFnData); ++i) {
- if (Callee->getName() == AllocationFnData[i].Name) {
- found = true;
- break;
- }
- }
- if (!found)
- return 0;
+ return nullptr;
+
+ // Make sure that the function is available.
+ StringRef FnName = Callee->getName();
+ LibFunc::Func TLIFn;
+ if (!TLI || !TLI->getLibFunc(FnName, TLIFn) || !TLI->has(TLIFn))
+ return nullptr;
+
+ const AllocFnsTy *FnData =
+ std::find_if(std::begin(AllocationFnData), std::end(AllocationFnData),
+ [TLIFn](const AllocFnsTy &Fn) { return Fn.Func == TLIFn; });
- const AllocFnsTy *FnData = &AllocationFnData[i];
- if ((FnData->AllocTy & AllocTy) == 0)
- return 0;
+ if (FnData == std::end(AllocationFnData))
+ return nullptr;
+
+ if ((FnData->AllocTy & AllocTy) != FnData->AllocTy)
+ return nullptr;
// Check function prototype.
- // FIXME: Check the nobuiltin metadata?? (PR5130)
int FstParam = FnData->FstParam;
int SndParam = FnData->SndParam;
FunctionType *FTy = Callee->getFunctionType();
FTy->getParamType(SndParam)->isIntegerTy(32) ||
FTy->getParamType(SndParam)->isIntegerTy(64)))
return FnData;
- return 0;
+ return nullptr;
}
static bool hasNoAliasAttr(const Value *V, bool LookThroughBitCast) {
/// \brief Tests if a value is a call or invoke to a library function that
/// allocates or reallocates memory (either malloc, calloc, realloc, or strdup
/// like).
-bool llvm::isAllocationFn(const Value *V, bool LookThroughBitCast) {
- return getAllocationData(V, AnyAlloc, LookThroughBitCast);
+bool llvm::isAllocationFn(const Value *V, const TargetLibraryInfo *TLI,
+ bool LookThroughBitCast) {
+ return getAllocationData(V, AnyAlloc, TLI, LookThroughBitCast);
}
/// \brief Tests if a value is a call or invoke to a function that returns a
/// NoAlias pointer (including malloc/calloc/realloc/strdup-like functions).
-bool llvm::isNoAliasFn(const Value *V, bool LookThroughBitCast) {
+bool llvm::isNoAliasFn(const Value *V, const TargetLibraryInfo *TLI,
+ bool LookThroughBitCast) {
// it's safe to consider realloc as noalias since accessing the original
// pointer is undefined behavior
- return isAllocationFn(V, LookThroughBitCast) ||
+ return isAllocationFn(V, TLI, LookThroughBitCast) ||
hasNoAliasAttr(V, LookThroughBitCast);
}
/// \brief Tests if a value is a call or invoke to a library function that
/// allocates uninitialized memory (such as malloc).
-bool llvm::isMallocLikeFn(const Value *V, bool LookThroughBitCast) {
- return getAllocationData(V, MallocLike, LookThroughBitCast);
+bool llvm::isMallocLikeFn(const Value *V, const TargetLibraryInfo *TLI,
+ bool LookThroughBitCast) {
+ return getAllocationData(V, MallocLike, TLI, LookThroughBitCast);
}
/// \brief Tests if a value is a call or invoke to a library function that
/// allocates zero-filled memory (such as calloc).
-bool llvm::isCallocLikeFn(const Value *V, bool LookThroughBitCast) {
- return getAllocationData(V, CallocLike, LookThroughBitCast);
+bool llvm::isCallocLikeFn(const Value *V, const TargetLibraryInfo *TLI,
+ bool LookThroughBitCast) {
+ return getAllocationData(V, CallocLike, TLI, LookThroughBitCast);
}
/// \brief Tests if a value is a call or invoke to a library function that
/// allocates memory (either malloc, calloc, or strdup like).
-bool llvm::isAllocLikeFn(const Value *V, bool LookThroughBitCast) {
- return getAllocationData(V, AllocLike, LookThroughBitCast);
-}
-
-/// \brief Tests if a value is a call or invoke to a library function that
-/// reallocates memory (such as realloc).
-bool llvm::isReallocLikeFn(const Value *V, bool LookThroughBitCast) {
- return getAllocationData(V, ReallocLike, LookThroughBitCast);
+bool llvm::isAllocLikeFn(const Value *V, const TargetLibraryInfo *TLI,
+ bool LookThroughBitCast) {
+ return getAllocationData(V, AllocLike, TLI, LookThroughBitCast);
}
/// extractMallocCall - Returns the corresponding CallInst if the instruction
/// is a malloc call. Since CallInst::CreateMalloc() only creates calls, we
/// ignore InvokeInst here.
-const CallInst *llvm::extractMallocCall(const Value *I) {
- return isMallocLikeFn(I) ? dyn_cast<CallInst>(I) : 0;
+const CallInst *llvm::extractMallocCall(const Value *I,
+ const TargetLibraryInfo *TLI) {
+ return isMallocLikeFn(I, TLI) ? dyn_cast<CallInst>(I) : nullptr;
}
-static Value *computeArraySize(const CallInst *CI, const TargetData *TD,
+static Value *computeArraySize(const CallInst *CI, const DataLayout &DL,
+ const TargetLibraryInfo *TLI,
bool LookThroughSExt = false) {
if (!CI)
- return NULL;
+ return nullptr;
// The size of the malloc's result type must be known to determine array size.
- Type *T = getMallocAllocatedType(CI);
- if (!T || !T->isSized() || !TD)
- return NULL;
+ Type *T = getMallocAllocatedType(CI, TLI);
+ if (!T || !T->isSized())
+ return nullptr;
- 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.
Value *MallocArg = CI->getArgOperand(0);
- Value *Multiple = NULL;
+ Value *Multiple = nullptr;
if (ComputeMultiple(MallocArg, ElementSize, Multiple,
LookThroughSExt))
return Multiple;
- return NULL;
-}
-
-/// isArrayMalloc - Returns the corresponding CallInst if the instruction
-/// 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 TargetData *TD) {
- const CallInst *CI = extractMallocCall(I);
- Value *ArraySize = computeArraySize(CI, TD);
-
- if (ArraySize &&
- ArraySize != ConstantInt::get(CI->getArgOperand(0)->getType(), 1))
- return CI;
-
- // CI is a non-array malloc or we can't figure out that it is an array malloc.
- return NULL;
+ return nullptr;
}
/// getMallocType - Returns the PointerType resulting from the malloc call.
/// 0: PointerType is the calls' return type.
/// 1: PointerType is the bitcast's result type.
/// >1: Unique PointerType cannot be determined, return NULL.
-PointerType *llvm::getMallocType(const CallInst *CI) {
- assert(isMallocLikeFn(CI) && "getMallocType and not malloc call");
-
- PointerType *MallocType = NULL;
+PointerType *llvm::getMallocType(const CallInst *CI,
+ const TargetLibraryInfo *TLI) {
+ assert(isMallocLikeFn(CI, TLI) && "getMallocType and not malloc call");
+
+ PointerType *MallocType = nullptr;
unsigned NumOfBitCastUses = 0;
// Determine if CallInst has a bitcast use.
- for (Value::const_use_iterator UI = CI->use_begin(), E = CI->use_end();
- UI != E; )
+ for (Value::const_user_iterator UI = CI->user_begin(), E = CI->user_end();
+ UI != E;)
if (const BitCastInst *BCI = dyn_cast<BitCastInst>(*UI++)) {
MallocType = cast<PointerType>(BCI->getDestTy());
NumOfBitCastUses++;
return cast<PointerType>(CI->getType());
// Type could not be determined.
- return NULL;
+ return nullptr;
}
/// getMallocAllocatedType - Returns the Type allocated by malloc call.
/// 0: PointerType is the malloc calls' return type.
/// 1: PointerType is the bitcast's result type.
/// >1: Unique PointerType cannot be determined, return NULL.
-Type *llvm::getMallocAllocatedType(const CallInst *CI) {
- PointerType *PT = getMallocType(CI);
- return PT ? PT->getElementType() : NULL;
+Type *llvm::getMallocAllocatedType(const CallInst *CI,
+ const TargetLibraryInfo *TLI) {
+ PointerType *PT = getMallocType(CI, TLI);
+ return PT ? PT->getElementType() : nullptr;
}
-/// getMallocArraySize - Returns the array size of a malloc call. If the
+/// getMallocArraySize - Returns the array size of a malloc call. If the
/// argument passed to malloc is a multiple of the size of the malloced type,
/// 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 TargetData *TD,
+Value *llvm::getMallocArraySize(CallInst *CI, const DataLayout &DL,
+ const TargetLibraryInfo *TLI,
bool LookThroughSExt) {
- assert(isMallocLikeFn(CI) && "getMallocArraySize and not malloc call");
- return computeArraySize(CI, TD, LookThroughSExt);
+ assert(isMallocLikeFn(CI, TLI) && "getMallocArraySize and not malloc call");
+ return computeArraySize(CI, DL, TLI, LookThroughSExt);
}
/// extractCallocCall - Returns the corresponding CallInst if the instruction
/// is a calloc call.
-const CallInst *llvm::extractCallocCall(const Value *I) {
- return isCallocLikeFn(I) ? cast<CallInst>(I) : 0;
+const CallInst *llvm::extractCallocCall(const Value *I,
+ const TargetLibraryInfo *TLI) {
+ return isCallocLikeFn(I, TLI) ? cast<CallInst>(I) : nullptr;
}
/// isFreeCall - Returns non-null if the value is a call to the builtin free()
-const CallInst *llvm::isFreeCall(const Value *I) {
+const CallInst *llvm::isFreeCall(const Value *I, const TargetLibraryInfo *TLI) {
const CallInst *CI = dyn_cast<CallInst>(I);
- if (!CI)
- return 0;
+ if (!CI || isa<IntrinsicInst>(CI))
+ return nullptr;
Function *Callee = CI->getCalledFunction();
- if (Callee == 0 || !Callee->isDeclaration())
- return 0;
-
- if (Callee->getName() != "free" &&
- Callee->getName() != "_ZdlPv" && // operator delete(void*)
- Callee->getName() != "_ZdaPv") // operator delete[](void*)
- return 0;
+ if (Callee == nullptr)
+ return nullptr;
+
+ StringRef FnName = Callee->getName();
+ LibFunc::Func TLIFn;
+ if (!TLI || !TLI->getLibFunc(FnName, TLIFn) || !TLI->has(TLIFn))
+ return nullptr;
+
+ unsigned ExpectedNumParams;
+ if (TLIFn == LibFunc::free ||
+ TLIFn == LibFunc::ZdlPv || // operator delete(void*)
+ TLIFn == LibFunc::ZdaPv || // operator delete[](void*)
+ TLIFn == LibFunc::msvc_delete_ptr32 || // operator delete(void*)
+ TLIFn == LibFunc::msvc_delete_ptr64 || // operator delete(void*)
+ TLIFn == LibFunc::msvc_delete_array_ptr32 || // operator delete[](void*)
+ TLIFn == LibFunc::msvc_delete_array_ptr64) // operator delete[](void*)
+ ExpectedNumParams = 1;
+ else if (TLIFn == LibFunc::ZdlPvj || // delete(void*, uint)
+ TLIFn == LibFunc::ZdlPvm || // delete(void*, ulong)
+ TLIFn == LibFunc::ZdlPvRKSt9nothrow_t || // delete(void*, nothrow)
+ TLIFn == LibFunc::ZdaPvj || // delete[](void*, uint)
+ TLIFn == LibFunc::ZdaPvm || // delete[](void*, ulong)
+ TLIFn == LibFunc::ZdaPvRKSt9nothrow_t || // delete[](void*, nothrow)
+ TLIFn == LibFunc::msvc_delete_ptr32_int || // delete(void*, uint)
+ TLIFn == LibFunc::msvc_delete_ptr64_longlong || // delete(void*, ulonglong)
+ TLIFn == LibFunc::msvc_delete_ptr32_nothrow || // delete(void*, nothrow)
+ TLIFn == LibFunc::msvc_delete_ptr64_nothrow || // delete(void*, nothrow)
+ TLIFn == LibFunc::msvc_delete_array_ptr32_int || // delete[](void*, uint)
+ TLIFn == LibFunc::msvc_delete_array_ptr64_longlong || // delete[](void*, ulonglong)
+ TLIFn == LibFunc::msvc_delete_array_ptr32_nothrow || // delete[](void*, nothrow)
+ TLIFn == LibFunc::msvc_delete_array_ptr64_nothrow) // delete[](void*, nothrow)
+ ExpectedNumParams = 2;
+ else
+ return nullptr;
// Check free prototype.
- // FIXME: workaround for PR5130, this will be obsolete when a nobuiltin
+ // FIXME: workaround for PR5130, this will be obsolete when a nobuiltin
// attribute will exist.
FunctionType *FTy = Callee->getFunctionType();
if (!FTy->getReturnType()->isVoidTy())
- return 0;
- if (FTy->getNumParams() != 1)
- return 0;
+ return nullptr;
+ if (FTy->getNumParams() != ExpectedNumParams)
+ return nullptr;
if (FTy->getParamType(0) != Type::getInt8PtrTy(Callee->getContext()))
- return 0;
+ return nullptr;
return CI;
}
/// 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 TargetData *TD,
- bool RoundToAlign) {
- if (!TD)
- return false;
-
- ObjectSizeOffsetVisitor Visitor(TD, Ptr->getContext(), RoundToAlign);
+bool llvm::getObjectSize(const Value *Ptr, uint64_t &Size, const DataLayout &DL,
+ const TargetLibraryInfo *TLI, bool RoundToAlign) {
+ ObjectSizeOffsetVisitor Visitor(DL, TLI, Ptr->getContext(), RoundToAlign);
SizeOffsetType Data = Visitor.compute(const_cast<Value*>(Ptr));
if (!Visitor.bothKnown(Data))
return false;
return Size;
}
-ObjectSizeOffsetVisitor::ObjectSizeOffsetVisitor(const TargetData *TD,
+ObjectSizeOffsetVisitor::ObjectSizeOffsetVisitor(const DataLayout &DL,
+ const TargetLibraryInfo *TLI,
LLVMContext &Context,
bool RoundToAlign)
-: TD(TD), RoundToAlign(RoundToAlign) {
- IntegerType *IntTy = TD->getIntPtrType(Context);
- IntTyBits = IntTy->getBitWidth();
- Zero = APInt::getNullValue(IntTyBits);
+ : DL(DL), TLI(TLI), RoundToAlign(RoundToAlign) {
+ // Pointer size must be rechecked for each object visited since it could have
+ // a different address space.
}
SizeOffsetType ObjectSizeOffsetVisitor::compute(Value *V) {
+ IntTyBits = DL.getPointerTypeSizeInBits(V->getType());
+ Zero = APInt::getNullValue(IntTyBits);
+
V = V->stripPointerCasts();
+ if (Instruction *I = dyn_cast<Instruction>(V)) {
+ // If we have already seen this instruction, bail out. Cycles can happen in
+ // unreachable code after constant propagation.
+ if (!SeenInsts.insert(I).second)
+ return unknown();
- if (GEPOperator *GEP = dyn_cast<GEPOperator>(V))
- return visitGEPOperator(*GEP);
- if (Instruction *I = dyn_cast<Instruction>(V))
+ if (GEPOperator *GEP = dyn_cast<GEPOperator>(V))
+ return visitGEPOperator(*GEP);
return visit(*I);
+ }
if (Argument *A = dyn_cast<Argument>(V))
return visitArgument(*A);
if (ConstantPointerNull *P = dyn_cast<ConstantPointerNull>(V))
return visitConstantPointerNull(*P);
+ if (GlobalAlias *GA = dyn_cast<GlobalAlias>(V))
+ return visitGlobalAlias(*GA);
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(V))
return visitGlobalVariable(*GV);
if (UndefValue *UV = dyn_cast<UndefValue>(V))
return visitUndefValue(*UV);
- if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V))
+ if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V)) {
if (CE->getOpcode() == Instruction::IntToPtr)
return unknown(); // clueless
+ if (CE->getOpcode() == Instruction::GetElementPtr)
+ return visitGEPOperator(cast<GEPOperator>(*CE));
+ }
DEBUG(dbgs() << "ObjectSizeOffsetVisitor::compute() unhandled value: " << *V
<< '\n');
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);
SizeOffsetType ObjectSizeOffsetVisitor::visitArgument(Argument &A) {
// no interprocedural analysis is done at the moment
- if (!A.hasByValAttr()) {
+ if (!A.hasByValOrInAllocaAttr()) {
++ObjectVisitorArgument;
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);
}
SizeOffsetType ObjectSizeOffsetVisitor::visitCallSite(CallSite CS) {
- const AllocFnsTy *FnData = getAllocationData(CS.getInstruction(), AnyAlloc);
+ const AllocFnsTy *FnData = getAllocationData(CS.getInstruction(), AnyAlloc,
+ TLI);
if (!FnData)
return unknown();
SizeOffsetType ObjectSizeOffsetVisitor::visitGEPOperator(GEPOperator &GEP) {
SizeOffsetType PtrData = compute(GEP.getPointerOperand());
- if (!bothKnown(PtrData) || !GEP.hasAllConstantIndices())
+ APInt Offset(IntTyBits, 0);
+ if (!bothKnown(PtrData) || !GEP.accumulateConstantOffset(DL, Offset))
return unknown();
- SmallVector<Value*, 8> Ops(GEP.idx_begin(), GEP.idx_end());
- APInt Offset(IntTyBits,TD->getIndexedOffset(GEP.getPointerOperandType(),Ops));
return std::make_pair(PtrData.first, PtrData.second + Offset);
}
+SizeOffsetType ObjectSizeOffsetVisitor::visitGlobalAlias(GlobalAlias &GA) {
+ if (GA.mayBeOverridden())
+ return unknown();
+ return compute(GA.getAliasee());
+}
+
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);
}
}
SizeOffsetType ObjectSizeOffsetVisitor::visitSelectInst(SelectInst &I) {
- // ignore malformed self-looping selects
- if (I.getTrueValue() == &I || I.getFalseValue() == &I)
- return unknown();
-
SizeOffsetType TrueSide = compute(I.getTrueValue());
SizeOffsetType FalseSide = compute(I.getFalseValue());
if (bothKnown(TrueSide) && bothKnown(FalseSide) && TrueSide == FalseSide)
return unknown();
}
-
-ObjectSizeOffsetEvaluator::ObjectSizeOffsetEvaluator(const TargetData *TD,
- LLVMContext &Context)
-: TD(TD), Context(Context), Builder(Context, TargetFolder(TD)),
-Visitor(TD, Context) {
- IntTy = TD->getIntPtrType(Context);
- Zero = ConstantInt::get(IntTy, 0);
+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 and Zero must be set for each compute() since the address space may
+ // be different for later objects.
}
SizeOffsetEvalType ObjectSizeOffsetEvaluator::compute(Value *V) {
+ // XXX - Are vectors of pointers possible here?
+ IntTy = cast<IntegerType>(DL.getIntPtrType(V->getType()));
+ Zero = ConstantInt::get(IntTy, 0);
+
SizeOffsetEvalType Result = compute_(V);
if (!bothKnown(Result)) {
}
SizeOffsetEvalType ObjectSizeOffsetEvaluator::compute_(Value *V) {
+ ObjectSizeOffsetVisitor Visitor(DL, TLI, Context, RoundToAlign);
SizeOffsetType Const = Visitor.compute(V);
if (Visitor.bothKnown(Const))
return std::make_pair(ConstantInt::get(Context, Const.first),
// always generate code immediately before the instruction being
// processed, so that the generated code dominates the same BBs
- Instruction *PrevInsertPoint = Builder.GetInsertPoint();
+ BuilderTy::InsertPointGuard Guard(Builder);
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).second) {
+ Result = unknown();
+ } else if (GEPOperator *GEP = dyn_cast<GEPOperator>(V)) {
Result = visitGEPOperator(*GEP);
} else if (Instruction *I = dyn_cast<Instruction>(V)) {
Result = visit(*I);
} else if (isa<Argument>(V) ||
(isa<ConstantExpr>(V) &&
cast<ConstantExpr>(V)->getOpcode() == Instruction::IntToPtr) ||
+ isa<GlobalAlias>(V) ||
isa<GlobalVariable>(V)) {
// ignore values where we cannot do more than what ObjectSizeVisitor can
Result = unknown();
Result = unknown();
}
- if (PrevInsertPoint)
- Builder.SetInsertPoint(PrevInsertPoint);
-
// Don't reuse CacheIt since it may be invalid at this point.
CacheMap[V] = Result;
return Result;
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);
}
SizeOffsetEvalType ObjectSizeOffsetEvaluator::visitCallSite(CallSite CS) {
- const AllocFnsTy *FnData = getAllocationData(CS.getInstruction(), AnyAlloc);
+ const AllocFnsTy *FnData = getAllocationData(CS.getInstruction(), AnyAlloc,
+ TLI);
if (!FnData)
return unknown();
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);
}
// compute offset/size for each PHI incoming pointer
for (unsigned i = 0, e = PHI.getNumIncomingValues(); i != e; ++i) {
- Builder.SetInsertPoint(PHI.getIncomingBlock(i)->getFirstInsertionPt());
+ Builder.SetInsertPoint(&*PHI.getIncomingBlock(i)->getFirstInsertionPt());
SizeOffsetEvalType EdgeData = compute_(PHI.getIncomingValue(i));
if (!bothKnown(EdgeData)) {
}
SizeOffsetEvalType ObjectSizeOffsetEvaluator::visitSelectInst(SelectInst &I) {
- // ignore malformed self-looping selects
- if (I.getTrueValue() == &I || I.getFalseValue() == &I)
- return unknown();
-
SizeOffsetEvalType TrueSide = compute_(I.getTrueValue());
SizeOffsetEvalType FalseSide = compute_(I.getFalseValue());