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Diffstat (limited to 'include/llvm/Analysis/MallocHelper.h')
-rw-r--r-- | include/llvm/Analysis/MallocHelper.h | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/include/llvm/Analysis/MallocHelper.h b/include/llvm/Analysis/MallocHelper.h new file mode 100644 index 0000000..0588dff --- /dev/null +++ b/include/llvm/Analysis/MallocHelper.h @@ -0,0 +1,86 @@ +//===- llvm/Analysis/MallocHelper.h ---- Identify malloc calls --*- C++ -*-===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This family of functions identifies calls to malloc, bitcasts of malloc +// calls, and the types and array sizes associated with them. +// +//===----------------------------------------------------------------------===// + +#ifndef LLVM_ANALYSIS_MALLOCHELPER_H +#define LLVM_ANALYSIS_MALLOCHELPER_H + +namespace llvm { +class CallInst; +class LLVMContext; +class PointerType; +class TargetData; +class Type; +class Value; + +//===----------------------------------------------------------------------===// +// malloc Call Utility Functions. +// + +/// isMalloc - Returns true if the the value is either a malloc call or a +/// bitcast of the result of a malloc call +bool isMalloc(const Value* I); + +/// extractMallocCall - Returns the corresponding CallInst if the instruction +/// is a malloc call. Since CallInst::CreateMalloc() only creates calls, we +/// ignore InvokeInst here. +const CallInst* extractMallocCall(const Value* I); +CallInst* extractMallocCall(Value* I); + +/// extractMallocCallFromBitCast - Returns the corresponding CallInst if the +/// instruction is a bitcast of the result of a malloc call. +const CallInst* extractMallocCallFromBitCast(const Value* I); +CallInst* extractMallocCallFromBitCast(Value* I); + +/// isArrayMalloc - Returns the corresponding CallInst if the instruction +/// matches the malloc call IR generated by CallInst::CreateMalloc(). This +/// means that it is a malloc call with one bitcast use AND the malloc call's +/// size argument is: +/// 1. a constant not equal to the malloc's allocated type +/// or +/// 2. the result of a multiplication by the malloc's allocated type +/// Otherwise it returns NULL. +/// The unique bitcast is needed to determine the type/size of the array +/// allocation. +CallInst* isArrayMalloc(Value* I, LLVMContext &Context, const TargetData* TD); +const CallInst* isArrayMalloc(const Value* I, LLVMContext &Context, + const TargetData* TD); + +/// getMallocType - Returns the PointerType resulting from the malloc call. +/// This PointerType is the result type of the call's only bitcast use. +/// If there is no unique bitcast use, then return NULL. +const PointerType* getMallocType(const CallInst* CI); + +/// 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 +/// unique bitcast use, then return NULL. +const Type* getMallocAllocatedType(const CallInst* CI); + +/// getMallocArraySize - Returns the array size of a malloc call. The array +/// size is computated in 1 of 3 ways: +/// 1. If the element type if of size 1, then array size is the argument to +/// malloc. +/// 2. Else if the malloc's argument is a constant, the array size is that +/// argument divided by the element type's size. +/// 3. Else the malloc argument must be a multiplication and the array size is +/// the first operand of the multiplication. +/// This function returns constant 1 if: +/// 1. The malloc call's allocated type cannot be determined. +/// 2. IR wasn't created by a call to CallInst::CreateMalloc() with a non-NULL +/// ArraySize. +Value* getMallocArraySize(CallInst* CI, LLVMContext &Context, + const TargetData* TD); + +} // End llvm namespace + +#endif |