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Rework constant pool handling so that function constant pools are no longer

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leaked to the system.  Now they are destroyed with the JITMemoryManager is
destroyed.

llvm-svn: 19434
This commit is contained in:
Chris Lattner 2005-01-10 18:23:22 +00:00
parent 8b03a55724
commit b35b30c283
1 changed files with 24 additions and 21 deletions
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43
lib/ExecutionEngine/JIT/JITEmitter.cpp
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@ -48,12 +48,15 @@ namespace {
sys::MemoryBlock MemBlock; // Virtual memory block allocated RWX
unsigned char *MemBase; // Base of block of memory, start of stub mem
unsigned char *FunctionBase; // Start of the function body area
unsigned char *CurStubPtr, *CurFunctionPtr;
unsigned char *ConstantPool; // Memory allocated for constant pools
unsigned char *CurStubPtr, *CurFunctionPtr, *CurConstantPtr;
public:
JITMemoryManager();
~JITMemoryManager();
inline unsigned char *allocateStub(unsigned StubSize);
inline unsigned char *allocateConstant(unsigned ConstantSize,
unsigned Alignment);
inline unsigned char *startFunctionBody();
inline void endFunctionBody(unsigned char *FunctionEnd);
};
@ -68,10 +71,14 @@ JITMemoryManager::JITMemoryManager() {
// 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) {
@ -83,6 +90,20 @@ unsigned char *JITMemoryManager::allocateStub(unsigned StubSize) {
return CurStubPtr;
}
unsigned char *JITMemoryManager::allocateConstant(unsigned ConstantSize,
unsigned Alignment) {
// Reserve space and align pointer.
CurConstantPtr -= ConstantSize;
CurConstantPtr =
(unsigned char *)((intptr_t)CurConstantPtr & ~((intptr_t)Alignment - 1));
if (CurConstantPtr < ConstantPool) {
std::cerr << "JIT ran out of memory for constant pools!\n";
abort();
}
return CurConstantPtr;
}
unsigned char *JITMemoryManager::startFunctionBody() {
// Round up to an even multiple of 8 bytes, this should eventually be target
// specific.
@ -352,30 +373,12 @@ void JITEmitter::emitConstantPool(MachineConstantPool *MCP) {
const std::vector<Constant*> &Constants = MCP->getConstants();
if (Constants.empty()) return;
std::vector<unsigned> ConstantOffset;
ConstantOffset.reserve(Constants.size());
// Calculate how much space we will need for all the constants, and the offset
// each one will live in.
unsigned TotalSize = 0;
for (unsigned i = 0, e = Constants.size(); i != e; ++i) {
const Type *Ty = Constants[i]->getType();
unsigned Size = (unsigned)TheJIT->getTargetData().getTypeSize(Ty);
unsigned Alignment = TheJIT->getTargetData().getTypeAlignment(Ty);
// Make sure to take into account the alignment requirements of the type.
TotalSize = (TotalSize + Alignment-1) & ~(Alignment-1);
// Remember the offset this element lives at.
ConstantOffset.push_back(TotalSize);
TotalSize += Size; // Reserve space for the constant.
}
// Now that we know how much memory to allocate, do so.
char *Pool = new char[TotalSize];
// Actually output all of the constants, and remember their addresses.
for (unsigned i = 0, e = Constants.size(); i != e; ++i) {
void *Addr = Pool + ConstantOffset[i];
void *Addr = MemMgr.allocateConstant(Size, Alignment);
TheJIT->InitializeMemory(Constants[i], Addr);
ConstantPoolAddresses.push_back(Addr);
}