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fix a tricky bug in the JIT global variable emitter, that was triggered when JITing a variable independently of a function. This lead to sharing memory memory between functions and GVs thus changing the value of a GV could change the code in execution. more details on the ML.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57900 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nuno Lopes
2008-10-21 11:42:16 +00:00
parent e06e91122f
commit cef7527a85
4 changed files with 44 additions and 7 deletions
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19
lib/ExecutionEngine/JIT/JITMemoryManager.cpp
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@ -298,7 +298,24 @@ namespace {
// Release the memory at the end of this block that isn't needed.
FreeMemoryList =CurBlock->TrimAllocationToSize(FreeMemoryList, BlockSize);
}
/// allocateSpace - Allocate a memory block of the given size.
unsigned char *allocateSpace(intptr_t Size, unsigned Alignment) {
CurBlock = FreeMemoryList;
FreeMemoryList = FreeMemoryList->AllocateBlock();
unsigned char *result = (unsigned char *)CurBlock+1;
if (Alignment == 0) Alignment = 1;
result = (unsigned char*)(((intptr_t)result+Alignment-1) &
~(intptr_t)(Alignment-1));
uintptr_t BlockSize = result + Size - (unsigned char *)CurBlock;
FreeMemoryList =CurBlock->TrimAllocationToSize(FreeMemoryList, BlockSize);
return result;
}
/// startExceptionTable - Use startFunctionBody to allocate memory for the
/// function's exception table.
unsigned char* startExceptionTable(const Function* F,