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the JIT memory manager will construct a GOT if you want it too. Also, it places the constants in the allocated memory, rather than a malloc area

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22497 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Lenharth 2005-07-22 20:48:12 +00:00
parent 6a6b2dbd3a
commit 16ec33c6ef
1 changed files with 51 additions and 9 deletions
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60
lib/ExecutionEngine/JIT/JITEmitter.cpp
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@ -52,8 +52,9 @@ namespace {
unsigned char *FunctionBase; // Start of the function body area
unsigned char *ConstantPool; // Memory allocated for constant pools
unsigned char *CurStubPtr, *CurFunctionPtr, *CurConstantPtr;
unsigned char *GOTBase; //Target Specific reserved memory
public:
JITMemoryManager();
JITMemoryManager(bool useGOT);
~JITMemoryManager();
inline unsigned char *allocateStub(unsigned StubSize);
@ -61,26 +62,34 @@ namespace {
unsigned Alignment);
inline unsigned char *startFunctionBody();
inline void endFunctionBody(unsigned char *FunctionEnd);
inline unsigned char* getGOTBase() const;
inline bool isManagingGOT() const;
};
}
JITMemoryManager::JITMemoryManager() {
JITMemoryManager::JITMemoryManager(bool useGOT) {
// Allocate a 16M block of memory...
MemBlock = sys::Memory::AllocateRWX((16 << 20));
MemBase = reinterpret_cast<unsigned char*>(MemBlock.base());
FunctionBase = MemBase + 512*1024; // Use 512k for stubs
ConstantPool = MemBase;
GOTBase = ConstantPool + 512*1024; //512 for constants
//8k number of entries in the GOT
FunctionBase = GOTBase + 8192 * sizeof(void*) + 512*1024; // Use 512k for stubs
//make it easier to tell if we are managing the GOT
if (!useGOT)
GOTBase = NULL;
// Allocate stubs backwards from the function base, allocate functions forward
// from the function base.
CurStubPtr = CurFunctionPtr = FunctionBase;
ConstantPool = new unsigned char [512*1024]; // Use 512k for constant pools
CurConstantPtr = ConstantPool + 512*1024;
}
JITMemoryManager::~JITMemoryManager() {
sys::Memory::ReleaseRWX(MemBlock);
delete[] ConstantPool;
}
unsigned char *JITMemoryManager::allocateStub(unsigned StubSize) {
@ -117,6 +126,14 @@ void JITMemoryManager::endFunctionBody(unsigned char *FunctionEnd) {
CurFunctionPtr = FunctionEnd;
}
unsigned char* JITMemoryManager::getGOTBase() const {
return GOTBase;
}
bool JITMemoryManager::isManagingGOT() const {
return GOTBase != NULL;
}
//===----------------------------------------------------------------------===//
// JIT lazy compilation code.
//
@ -320,8 +337,17 @@ namespace {
/// Relocations - These are the relocations that the function needs, as
/// emitted.
std::vector<MachineRelocation> Relocations;
public:
JITEmitter(JIT &jit) { TheJIT = &jit; }
JITEmitter(JIT &jit)
:MemMgr(jit.getJITInfo().needsGOT()),
nextGOTIndex(0)
{
TheJIT = &jit;
DEBUG(std::cerr <<
(MemMgr.isManagingGOT() ? "JIT is managing GOT\n"
: "JIT is not managing GOT\n"));
}
virtual void startFunction(MachineFunction &F);
virtual void finishFunction(MachineFunction &F);
@ -342,6 +368,8 @@ namespace {
private:
void *getPointerToGlobal(GlobalValue *GV, void *Reference, bool NoNeedStub);
unsigned nextGOTIndex;
std::map<void*, unsigned> revGOTMap;
};
}
@ -388,7 +416,6 @@ void JITEmitter::startFunction(MachineFunction &F) {
void JITEmitter::finishFunction(MachineFunction &F) {
MemMgr.endFunctionBody(CurByte);
ConstantPoolAddresses.clear();
NumBytes += CurByte-CurBlock;
if (!Relocations.empty()) {
@ -404,15 +431,29 @@ void JITEmitter::finishFunction(MachineFunction &F) {
// If the target REALLY wants a stub for this function, emit it now.
if (!MR.doesntNeedFunctionStub())
ResultPtr = getJITResolver(this).getExternalFunctionStub(ResultPtr);
} else
} else if (MR.isGlobalValue())
ResultPtr = getPointerToGlobal(MR.getGlobalValue(),
CurBlock+MR.getMachineCodeOffset(),
MR.doesntNeedFunctionStub());
else //ConstantPoolIndex
ResultPtr =
(void*)getConstantPoolEntryAddress(MR.getConstantPoolIndex());
MR.setResultPointer(ResultPtr);
// if we are managing the got, check to see if this pointer has all ready
// been allocated a GOT entry. If not, give it the next one.
if (MemMgr.isManagingGOT()) {
if (!revGOTMap[ResultPtr])
revGOTMap[ResultPtr] = ++nextGOTIndex;
((void**)MemMgr.getGOTBase())[revGOTMap[ResultPtr]] = ResultPtr;
if(MR.isGOTRelative())
MR.setGOTIndex(revGOTMap[ResultPtr]);
}
}
TheJIT->getJITInfo().relocate(CurBlock, &Relocations[0],
Relocations.size());
Relocations.size(), MemMgr.getGOTBase());
}
DEBUG(std::cerr << "JIT: Finished CodeGen of [" << (void*)CurBlock
@ -420,6 +461,7 @@ void JITEmitter::finishFunction(MachineFunction &F) {
<< ": " << CurByte-CurBlock << " bytes of text, "
<< Relocations.size() << " relocations\n");
Relocations.clear();
ConstantPoolAddresses.clear();
}
void JITEmitter::emitConstantPool(MachineConstantPool *MCP) {