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Allow target to specify alignment for function stub.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31788 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2006-11-16 20:04:54 +00:00
parent ce9a576f29
commit 9a1e9b9140
2 changed files with 12 additions and 6 deletions
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2
include/llvm/CodeGen/MachineCodeEmitter.h
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@ -80,7 +80,7 @@ public:
/// have constant pools, the can only use the other emitByte*/emitWord*
/// methods.
///
virtual void startFunctionStub(unsigned StubSize) = 0;
virtual void startFunctionStub(unsigned StubSize, unsigned Alignment = 1) = 0;
/// finishFunctionStub - This callback is invoked to terminate a function
/// stub.

16
lib/ExecutionEngine/JIT/JITEmitter.cpp
View File

@ -275,7 +275,7 @@ namespace {
JITMemoryManager(bool useGOT);
~JITMemoryManager();
inline unsigned char *allocateStub(unsigned StubSize);
inline unsigned char *allocateStub(unsigned StubSize, unsigned Alignment);
/// startFunctionBody - When a function starts, allocate a block of free
/// executable memory, returning a pointer to it and its actual size.
@ -403,8 +403,11 @@ JITMemoryManager::~JITMemoryManager() {
Blocks.clear();
}
unsigned char *JITMemoryManager::allocateStub(unsigned StubSize) {
unsigned char *JITMemoryManager::allocateStub(unsigned StubSize,
unsigned Alignment) {
CurStubPtr -= StubSize;
CurStubPtr = (unsigned char*)(((intptr_t)CurStubPtr) &
~(intptr_t)(Alignment-1));
if (CurStubPtr < StubBase) {
// FIXME: allocate a new block
std::cerr << "JIT ran out of memory for function stubs!\n";
@ -700,7 +703,7 @@ public:
void initJumpTableInfo(MachineJumpTableInfo *MJTI);
void emitJumpTableInfo(MachineJumpTableInfo *MJTI);
virtual void startFunctionStub(unsigned StubSize);
virtual void startFunctionStub(unsigned StubSize, unsigned Alignment = 1);
virtual void* finishFunctionStub(const Function *F);
virtual void addRelocation(const MachineRelocation &MR) {
@ -769,6 +772,9 @@ void JITEmitter::startFunction(MachineFunction &F) {
BufferBegin = CurBufferPtr = MemMgr.startFunctionBody(ActualSize);
BufferEnd = BufferBegin+ActualSize;
// Ensure the constant pool/jump table info is at least 4-byte aligned.
emitAlignment(16);
emitConstantPool(F.getConstantPool());
initJumpTableInfo(F.getJumpTableInfo());
@ -928,12 +934,12 @@ void JITEmitter::emitJumpTableInfo(MachineJumpTableInfo *MJTI) {
}
}
void JITEmitter::startFunctionStub(unsigned StubSize) {
void JITEmitter::startFunctionStub(unsigned StubSize, unsigned Alignment) {
SavedBufferBegin = BufferBegin;
SavedBufferEnd = BufferEnd;
SavedCurBufferPtr = CurBufferPtr;
BufferBegin = CurBufferPtr = MemMgr.allocateStub(StubSize);
BufferBegin = CurBufferPtr = MemMgr.allocateStub(StubSize, Alignment);
BufferEnd = BufferBegin+StubSize+1;
}