On Darwin ARM, memory needs special handling to do JIT. This patch expands
this handling to work properly for modifying stub functions, relocations
back to entry points after JIT compilation, etc..
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57013 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/ExecutionEngine/JIT/JITEmitter.cpp b/lib/ExecutionEngine/JIT/JITEmitter.cpp
index ffaeb1c..a90a6a5 100644
--- a/lib/ExecutionEngine/JIT/JITEmitter.cpp
+++ b/lib/ExecutionEngine/JIT/JITEmitter.cpp
@@ -560,6 +560,10 @@
if (ExceptionHandling) DE->setModuleInfo(Info);
}
+ void setMemoryExecutable(void) {
+ MemMgr->setMemoryExecutable();
+ }
+
private:
void *getPointerToGlobal(GlobalValue *GV, void *Reference, bool NoNeedStub);
void *getPointerToGVLazyPtr(GlobalValue *V, void *Reference,
@@ -791,6 +795,8 @@
void JITEmitter::startFunction(MachineFunction &F) {
uintptr_t ActualSize = 0;
+ // Set the memory writable, if it's not already
+ MemMgr->setMemoryWritable();
if (MemMgr->NeedsExactSize()) {
DOUT << "ExactSize\n";
const TargetInstrInfo* TII = F.getTarget().getInstrInfo();
@@ -938,7 +944,7 @@
Relocations.clear();
// Mark code region readable and executable if it's not so already.
- sys::Memory::SetRXPrivilege(FnStart, FnEnd-FnStart);
+ MemMgr->setMemoryExecutable();
#ifndef NDEBUG
{
@@ -1086,6 +1092,10 @@
void *JITEmitter::finishFunctionStub(const GlobalValue* F) {
NumBytes += getCurrentPCOffset();
+
+ // Invalidate the icache if necessary.
+ sys::Memory::InvalidateInstructionCache(BufferBegin, NumBytes);
+
std::swap(SavedBufferBegin, BufferBegin);
BufferEnd = SavedBufferEnd;
CurBufferPtr = SavedCurBufferPtr;