//===----------------------------------------------------------------------===//
//
// This family of functions identifies calls to builtin functions that allocate
-// or free memory.
+// or free memory.
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/SmallPtrSet.h"
+#include "llvm/Analysis/TargetFolder.h"
#include "llvm/IR/IRBuilder.h"
+#include "llvm/IR/InstVisitor.h"
#include "llvm/IR/Operator.h"
-#include "llvm/InstVisitor.h"
+#include "llvm/IR/ValueHandle.h"
#include "llvm/Support/DataTypes.h"
-#include "llvm/Support/TargetFolder.h"
-#include "llvm/Support/ValueHandle.h"
namespace llvm {
class CallInst;
bool isReallocLikeFn(const Value *V, const TargetLibraryInfo *TLI,
bool LookThroughBitCast = false);
+/// \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 isOperatorNewLikeFn(const Value *V, const TargetLibraryInfo *TLI,
+ bool LookThroughBitCast = false);
//===----------------------------------------------------------------------===//
// malloc Call Utility Functions.
return const_cast<CallInst*>(extractMallocCall((const Value*)I, TLI));
}
-/// 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 *isArrayMalloc(const Value *I, const DataLayout *TD,
- const TargetLibraryInfo *TLI);
-
/// getMallocType - Returns the PointerType resulting from the malloc call.
/// The PointerType depends on the number of bitcast uses of the malloc call:
/// 0: PointerType is the malloc calls' return type.
/// >1: Unique PointerType cannot be determined, return NULL.
Type *getMallocAllocatedType(const CallInst *CI, const TargetLibraryInfo *TLI);
-/// 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 *getMallocArraySize(CallInst *CI, const DataLayout *TD,
+Value *getMallocArraySize(CallInst *CI, const DataLayout &DL,
const TargetLibraryInfo *TLI,
bool LookThroughSExt = false);
-
//===----------------------------------------------------------------------===//
// calloc Call Utility Functions.
//
/// isFreeCall - Returns non-null if the value is a call to the builtin free()
const CallInst *isFreeCall(const Value *I, const TargetLibraryInfo *TLI);
-
+
static inline CallInst *isFreeCall(Value *I, const TargetLibraryInfo *TLI) {
return const_cast<CallInst*>(isFreeCall((const Value*)I, TLI));
}
-
+
//===----------------------------------------------------------------------===//
// Utility functions to compute size of objects.
//
/// \brief Compute the size of the object pointed by Ptr. Returns true and the
-/// object size in Size if successful, and false otherwise.
+/// object size in Size if successful, and false otherwise. In this context, by
+/// object we mean the region of memory starting at Ptr to the end of the
+/// underlying object pointed to by Ptr.
/// If RoundToAlign is true, then Size is rounded up to the aligment of allocas,
/// byval arguments, and global variables.
-bool getObjectSize(const Value *Ptr, uint64_t &Size, const DataLayout *TD,
+bool getObjectSize(const Value *Ptr, uint64_t &Size, const DataLayout &DL,
const TargetLibraryInfo *TLI, bool RoundToAlign = false);
-/// \brief Compute the size of the underlying object pointed by Ptr. Returns
-/// true and the 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 getUnderlyingObjectSize(const Value *Ptr, uint64_t &Size,
- const DataLayout *TD, const TargetLibraryInfo *TLI,
- bool RoundToAlign = false);
-
-
-
typedef std::pair<APInt, APInt> SizeOffsetType;
-/// \brief Evaluate the size and offset of an object ponted by a Value*
+/// \brief 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.
class ObjectSizeOffsetVisitor
: public InstVisitor<ObjectSizeOffsetVisitor, SizeOffsetType> {
- typedef DenseMap<const Value*, SizeOffsetType> CacheMapTy;
-
- const DataLayout *TD;
+ const DataLayout &DL;
const TargetLibraryInfo *TLI;
bool RoundToAlign;
unsigned IntTyBits;
APInt Zero;
- CacheMapTy CacheMap;
+ SmallPtrSet<Instruction *, 8> SeenInsts;
APInt align(APInt Size, uint64_t Align);
}
public:
- ObjectSizeOffsetVisitor(const DataLayout *TD, const TargetLibraryInfo *TLI,
+ ObjectSizeOffsetVisitor(const DataLayout &DL, const TargetLibraryInfo *TLI,
LLVMContext &Context, bool RoundToAlign = false);
SizeOffsetType compute(Value *V);
return knownSize(SizeOffset) && knownOffset(SizeOffset);
}
+ // These are "private", except they can't actually be made private. Only
+ // compute() should be used by external users.
SizeOffsetType visitAllocaInst(AllocaInst &I);
SizeOffsetType visitArgument(Argument &A);
SizeOffsetType visitCallSite(CallSite CS);
typedef std::pair<Value*, Value*> SizeOffsetEvalType;
-/// \brief Evaluate the size and offset of an object ponted by a Value*.
+/// \brief Evaluate the size and offset of an object pointed to by a Value*.
/// May create code to compute the result at run-time.
class ObjectSizeOffsetEvaluator
: public InstVisitor<ObjectSizeOffsetEvaluator, SizeOffsetEvalType> {
typedef DenseMap<const Value*, WeakEvalType> CacheMapTy;
typedef SmallPtrSet<const Value*, 8> PtrSetTy;
- const DataLayout *TD;
+ const DataLayout &DL;
const TargetLibraryInfo *TLI;
LLVMContext &Context;
BuilderTy Builder;
Value *Zero;
CacheMapTy CacheMap;
PtrSetTy SeenVals;
+ bool RoundToAlign;
SizeOffsetEvalType unknown() {
- return std::make_pair((Value*)0, (Value*)0);
+ return std::make_pair(nullptr, nullptr);
}
SizeOffsetEvalType compute_(Value *V);
public:
- ObjectSizeOffsetEvaluator(const DataLayout *TD, const TargetLibraryInfo *TLI,
- LLVMContext &Context);
+ ObjectSizeOffsetEvaluator(const DataLayout &DL, const TargetLibraryInfo *TLI,
+ LLVMContext &Context, bool RoundToAlign = false);
SizeOffsetEvalType compute(Value *V);
bool knownSize(SizeOffsetEvalType SizeOffset) {
return knownSize(SizeOffset) && knownOffset(SizeOffset);
}
+ // The individual instruction visitors should be treated as private.
SizeOffsetEvalType visitAllocaInst(AllocaInst &I);
SizeOffsetEvalType visitCallSite(CallSite CS);
SizeOffsetEvalType visitExtractElementInst(ExtractElementInst &I);
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