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Fix PR3724 by searching for the largest free block when

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allocating memory in the JIT.  This is insanely inefficient, but
hey, most people implement their own memory managers anyway.

Patch by Eric Yew!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66472 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-03-09 21:34:10 +00:00
parent d07128c906
commit 96c96b46e9
1 changed files with 19 additions and 2 deletions
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21
lib/ExecutionEngine/JIT/JITMemoryManager.cpp
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@ -278,10 +278,27 @@ namespace {
/// startFunctionBody - When a function starts, allocate a block of free
/// executable memory, returning a pointer to it and its actual size.
unsigned char *startFunctionBody(const Function *F, uintptr_t &ActualSize) {
CurBlock = FreeMemoryList;
FreeRangeHeader* candidateBlock = FreeMemoryList;
FreeRangeHeader* head = FreeMemoryList;
FreeRangeHeader* iter = head->Next;
uintptr_t largest = candidateBlock->BlockSize;
// Search for the largest free block
while (iter != head) {
if (iter->BlockSize > largest) {
largest = iter->BlockSize;
candidateBlock = iter;
}
iter = iter->Next;
}
// Select this candidate block for allocation
CurBlock = candidateBlock;
// Allocate the entire memory block.
FreeMemoryList = FreeMemoryList->AllocateBlock();
FreeMemoryList = candidateBlock->AllocateBlock();
ActualSize = CurBlock->BlockSize-sizeof(MemoryRangeHeader);
return (unsigned char *)(CurBlock+1);
}