Hello,
Is anyone familiar with the ExecutionEngine, particularly the handling of
GVMemoryBlocks?
Line 114 in Create(GV,TD) is suspicious [1]:
static char *Create(const GlobalVariable *GV, const DataLayout& TD) {
Type *ElTy = GV->getValueType();
size_t GVSize = (size_t)TD.getTypeAllocSize(ElTy);
void *RawMemory = ::operator new(
alignTo(sizeof(GVMemoryBlock), TD.getPreferredAlignment(GV)) + GVSize);
new(RawMemory) GVMemoryBlock(GV);
return static_cast<char*>(RawMemory) + sizeof(GVMemoryBlock); // <—
[1]
}
Example:
Suppose sizeof(GVMemoryBlock) == 3 bytes. Further, assume the preferred
TD-alignment is on 4-byte boundaries. Finally, for sake of argument, assume
RawMemory points to address 4. Then Create(GV, TD) returns 7, a non-aligned
address with respect to the preferred TD-alignment.
Is this expected?
Many thanks for your time!
- Alex
[1]
https://github.com/llvm-mirror/llvm/blob/91b6092209489b4790826efc66fce178a6ec7f46/lib/ExecutionEngine/ExecutionEngine.cpp#L114
PS
Also, if anyone happens to know, why is the empty ~GVMemoryBlock() destructor
explicitly called in the deleted() callback? The last comment left there seems
to indicate someone else before me was also puzzled by this :)
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