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Extend getMallocArraySize() to determine the array size if the malloc argument is:

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ArraySize * ElementSize
ElementSize * ArraySize
ArraySize << log2(ElementSize)
ElementSize << log2(ArraySize)

Refactor isArrayMallocHelper and delete isSafeToGetMallocArraySize, so that there is only 1 copy of the malloc array determining logic.
Update users of getMallocArraySize() to not bother calling isArrayMalloc() as well.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85421 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Victor Hernandez
2009-10-28 20:18:55 +00:00
parent 5c00b4af61
commit 90f48e7c91
5 changed files with 191 additions and 140 deletions
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25
include/llvm/Analysis/MemoryBuiltins.h
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@@ -43,15 +43,8 @@ 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 size of the malloced type
/// or
/// 2. the result of a multiplication by the size of the malloced type
/// Otherwise it returns NULL.
/// The unique bitcast is needed to determine the type/size of the array
/// allocation.
/// is a call to malloc whose array size can be determined and the array size
/// is not constant 1. Otherwise, return NULL.
CallInst* isArrayMalloc(Value* I, LLVMContext &Context, const TargetData* TD);
const CallInst* isArrayMalloc(const Value* I, LLVMContext &Context,
const TargetData* TD);
@@ -66,16 +59,10 @@ const PointerType* getMallocType(const CallInst* CI);
/// unique bitcast use, then return NULL.
const Type* getMallocAllocatedType(const CallInst* CI);
/// getMallocArraySize - Returns the array size of a malloc call. For array
/// mallocs, the size is computated in 1 of 3 ways:
/// 1. If the element type is 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.
/// For non-array mallocs, the computed size is constant 1.
/// This function returns NULL for all mallocs whose array size cannot be
/// 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, LLVMContext &Context,
const TargetData* TD);