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For some targets, it's not possible to place GVs in the same memory buffer as the MachineCodeEmitter allocated memory. Code and data has different read / write / execution privilege requirements.

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This is a short term workaround. The current solution is for the JIT memory manager to manage code and data memory separately.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58688 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2008-11-04 09:30:48 +00:00
parent c40b75b55a
commit b0b53491ef
3 changed files with 26 additions and 0 deletions
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10
lib/ExecutionEngine/JIT/JIT.cpp
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@ -565,6 +565,16 @@ void *JIT::getOrEmitGlobalVariable(const GlobalVariable *GV) {
if (GV->isThreadLocal()) {
MutexGuard locked(lock);
Ptr = TJI.allocateThreadLocalMemory(S);
} else if (TJI.allocateSeparateGVMemory()) {
if (A <= 8) {
Ptr = malloc(S);
} else {
// Allocate S+A bytes of memory, then use an aligned pointer within that
// space.
Ptr = malloc(S+A);
unsigned MisAligned = ((intptr_t)Ptr & (A-1));
Ptr = (char*)Ptr + (MisAligned ? (A-MisAligned) : 0);
}
} else {
Ptr = MCE->allocateSpace(S, A);
}