diff options
| -rw-r--r-- | lib/ExecutionEngine/JIT/JITMemoryManager.cpp | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/lib/ExecutionEngine/JIT/JITMemoryManager.cpp b/lib/ExecutionEngine/JIT/JITMemoryManager.cpp index 0dcc71f..b2bf852 100644 --- a/lib/ExecutionEngine/JIT/JITMemoryManager.cpp +++ b/lib/ExecutionEngine/JIT/JITMemoryManager.cpp @@ -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); } |