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Merged in tools/lli/JIT/SparcEmitter.cpp, coupled with the JITResolver taken 

from lib/Target/X86/X86CodeEmitter.cpp .

llvm-svn: 6530
This commit is contained in:
Misha Brukman 2003-06-02 04:12:39 +00:00
parent 6fd0681010
commit ce62d36615
2 changed files with 275 additions and 19 deletions
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267
llvm/lib/Target/Sparc/SparcV9CodeEmitter.cpp
View File

@ -3,28 +3,132 @@
//
//===----------------------------------------------------------------------===//
#include "llvm/Constants.h"
#include "llvm/Function.h"
#include "llvm/GlobalVariable.h"
#include "llvm/PassManager.h"
#include "llvm/CodeGen/MachineCodeEmitter.h"
#include "llvm/CodeGen/MachineFunctionInfo.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetData.h"
#include "Support/hash_set"
#include "SparcInternals.h"
#include "SparcV9CodeEmitter.h"
MachineCodeEmitter * SparcV9CodeEmitter::MCE = 0;
TargetMachine * SparcV9CodeEmitter::TM = 0;
bool UltraSparc::addPassesToEmitMachineCode(PassManager &PM,
MachineCodeEmitter &MCE) {
//PM.add(new SparcV9CodeEmitter(MCE));
//MachineCodeEmitter *M = MachineCodeEmitter::createDebugMachineCodeEmitter();
MachineCodeEmitter *M =
MachineCodeEmitter::createFilePrinterMachineCodeEmitter(MCE);
MachineCodeEmitter *M = MachineCodeEmitter::createFilePrinterEmitter(MCE);
PM.add(new SparcV9CodeEmitter(this, *M));
PM.add(createMachineCodeDestructionPass()); // Free stuff no longer needed
return false;
}
namespace {
class JITResolver {
MachineCodeEmitter &MCE;
// LazyCodeGenMap - Keep track of call sites for functions that are to be
// lazily resolved.
std::map<unsigned, Function*> LazyCodeGenMap;
// LazyResolverMap - Keep track of the lazy resolver created for a
// particular function so that we can reuse them if necessary.
std::map<Function*, unsigned> LazyResolverMap;
public:
JITResolver(MachineCodeEmitter &mce) : MCE(mce) {}
unsigned getLazyResolver(Function *F);
unsigned addFunctionReference(unsigned Address, Function *F);
private:
unsigned emitStubForFunction(Function *F);
static void CompilationCallback();
unsigned resolveFunctionReference(unsigned RetAddr);
};
JITResolver *TheJITResolver;
}
/// addFunctionReference - This method is called when we need to emit the
/// address of a function that has not yet been emitted, so we don't know the
/// address. Instead, we emit a call to the CompilationCallback method, and
/// keep track of where we are.
///
unsigned JITResolver::addFunctionReference(unsigned Address, Function *F) {
LazyCodeGenMap[Address] = F;
return (intptr_t)&JITResolver::CompilationCallback;
}
unsigned JITResolver::resolveFunctionReference(unsigned RetAddr) {
std::map<unsigned, Function*>::iterator I = LazyCodeGenMap.find(RetAddr);
assert(I != LazyCodeGenMap.end() && "Not in map!");
Function *F = I->second;
LazyCodeGenMap.erase(I);
return MCE.forceCompilationOf(F);
}
unsigned JITResolver::getLazyResolver(Function *F) {
std::map<Function*, unsigned>::iterator I = LazyResolverMap.lower_bound(F);
if (I != LazyResolverMap.end() && I->first == F) return I->second;
//std::cerr << "Getting lazy resolver for : " << ((Value*)F)->getName() << "\n";
unsigned Stub = emitStubForFunction(F);
LazyResolverMap.insert(I, std::make_pair(F, Stub));
return Stub;
}
void JITResolver::CompilationCallback() {
uint64_t *StackPtr = (uint64_t*)__builtin_frame_address(0);
uint64_t RetAddr = (uint64_t)(intptr_t)__builtin_return_address(0);
#if 0
std::cerr << "In callback! Addr=0x" << std::hex << RetAddr
<< " SP=0x" << (unsigned)StackPtr << std::dec
<< ": Resolving call to function: "
<< TheVM->getFunctionReferencedName((void*)RetAddr) << "\n";
#endif
std::cerr << "Sparc's JIT Resolver not implemented!\n";
abort();
#if 0
unsigned NewVal = TheJITResolver->resolveFunctionReference((void*)RetAddr);
// Rewrite the call target... so that we don't fault every time we execute
// the call.
*(unsigned*)RetAddr = NewVal;
// Change the return address to reexecute the call instruction...
StackPtr[1] -= 4;
#endif
}
/// emitStubForFunction - This method is used by the JIT when it needs to emit
/// the address of a function for a function whose code has not yet been
/// generated. In order to do this, it generates a stub which jumps to the lazy
/// function compiler, which will eventually get fixed to call the function
/// directly.
///
unsigned JITResolver::emitStubForFunction(Function *F) {
#if 0
MCE.startFunctionStub(*F, 6);
MCE.emitByte(0xE8); // Call with 32 bit pc-rel destination...
unsigned Address = addFunctionReference(MCE.getCurrentPCValue(), F);
MCE.emitWord(Address-MCE.getCurrentPCValue()-4);
MCE.emitByte(0xCD); // Interrupt - Just a marker identifying the stub!
return (intptr_t)MCE.finishFunctionStub(*F);
#endif
std::cerr << "Sparc's JITResolver::emitStubForFunction() not implemented!\n";
abort();
}
void SparcV9CodeEmitter::emitConstant(unsigned Val, unsigned Size) {
// Output the constant in big endian byte order...
unsigned byteVal;
@ -90,16 +194,19 @@ int64_t SparcV9CodeEmitter::getMachineOpValue(MachineInstr &MI,
fakeReg = TM->getRegInfo().getClassRegNum(fakeReg, regClass);
// Find the real register number for use in an instruction
realReg = getRealRegNum(fakeReg, regClass);
std::cerr << "Reg[" << fakeReg << "] = " << realReg << "\n";
std::cerr << "Reg[" << std::dec << fakeReg << "] = " << realReg << "\n";
rv = realReg;
} else if (MO.isImmediate()) {
rv = MO.getImmedValue();
} else if (MO.isPCRelativeDisp()) {
std::cerr << "Saving reference to BB (PCRelDisp)\n";
MCE->saveBBreference((BasicBlock*)MO.getVRegValue(), MI);
} else if (MO.isPCRelativeDisp()) { // this is not always a call!! (fp const)
std::cerr << "Saving reference to func (call - PCRelDisp)\n";
rv = (int64_t)
(intptr_t)getGlobalAddress(cast<GlobalValue>(MO.getVRegValue()),
MI,true);
} else if (MO.isMachineBasicBlock()) {
std::cerr << "Saving reference to BB (MBB)\n";
MCE->saveBBreference(MO.getMachineBasicBlock()->getBasicBlock(), MI);
std::cerr << "Saving reference to MBB\n";
BBRefs.push_back(std::make_pair(MO.getMachineBasicBlock()->getBasicBlock(),
std::make_pair((unsigned*)(intptr_t)MCE->getCurrentPCValue(),&MI)));
} else if (MO.isFrameIndex()) {
std::cerr << "ERROR: Frame index unhandled.\n";
} else if (MO.isConstantPoolIndex()) {
@ -134,19 +241,98 @@ unsigned SparcV9CodeEmitter::getValueBit(int64_t Val, unsigned bit) {
return (Val & 1);
}
void* SparcV9CodeEmitter::convertAddress(intptr_t Addr, bool isPCRelative) {
if (isPCRelative) {
return (void*)(Addr - (intptr_t)MCE->getCurrentPCValue());
} else {
return (void*)Addr;
}
}
bool SparcV9CodeEmitter::runOnMachineFunction(MachineFunction &MF) {
std::cerr << "Starting function " << MF.getFunction()->getName()
<< ", address: " << "0x" << std::hex
<< (long)MCE->getCurrentPCValue() << "\n";
MCE->startFunction(MF);
MCE->emitConstantPool(MF.getConstantPool());
// FIXME: the Sparc backend does not use the ConstantPool!!
//MCE->emitConstantPool(MF.getConstantPool());
// Instead, the Sparc backend has its own constant pool implementation:
const hash_set<const Constant*> &pool = MF.getInfo()->getConstantPoolValues();
for (hash_set<const Constant*>::const_iterator I = pool.begin(),
E = pool.end(); I != E; ++I)
{
const Constant *C = *I;
// For now we just allocate some memory on the heap, this can be
// dramatically improved.
const Type *Ty = ((Value*)C)->getType();
void *Addr = malloc(TM->getTargetData().getTypeSize(Ty));
//FIXME
//TheVM.InitializeMemory(C, Addr);
std::cerr << "Adding ConstantMap[" << C << "]=" << std::dec << Addr << "\n";
ConstantMap[C] = Addr;
}
for (MachineFunction::iterator I = MF.begin(), E = MF.end(); I != E; ++I)
emitBasicBlock(*I);
MCE->finishFunction(MF);
std::cerr << "Finishing function " << MF.getFunction()->getName() << "\n";
ConstantMap.clear();
for (unsigned i = 0, e = BBRefs.size(); i != e; ++i) {
long Location = BBLocations[BBRefs[i].first];
unsigned *Ref = BBRefs[i].second.first;
MachineInstr *MI = BBRefs[i].second.second;
std::cerr << "Fixup @" << std::hex << Ref << " to " << Location
<< " in instr: " << std::dec << *MI << "\n";
}
// Resolve branches to BasicBlocks for the entire function
for (unsigned i = 0, e = BBRefs.size(); i != e; ++i) {
long Location = BBLocations[BBRefs[i].first];
unsigned *Ref = BBRefs[i].second.first;
MachineInstr *MI = BBRefs[i].second.second;
std::cerr << "attempting to resolve BB: " << i << "\n";
for (unsigned ii = 0, ee = MI->getNumOperands(); ii != ee; ++ii) {
MachineOperand &op = MI->getOperand(ii);
if (op.isPCRelativeDisp()) {
// the instruction's branch target is made such that it branches to
// PC + (br target * 4), so undo that arithmetic here:
// Location is the target of the branch
// Ref is the location of the instruction, and hence the PC
unsigned branchTarget = (Location - (long)Ref) >> 2;
// Save the flags.
bool loBits32=false, hiBits32=false, loBits64=false, hiBits64=false;
if (op.opLoBits32()) { loBits32=true; }
if (op.opHiBits32()) { hiBits32=true; }
if (op.opLoBits64()) { loBits64=true; }
if (op.opHiBits64()) { hiBits64=true; }
MI->SetMachineOperandConst(ii, MachineOperand::MO_SignExtendedImmed,
branchTarget);
if (loBits32) { MI->setOperandLo32(ii); }
else if (hiBits32) { MI->setOperandHi32(ii); }
else if (loBits64) { MI->setOperandLo64(ii); }
else if (hiBits64) { MI->setOperandHi64(ii); }
std::cerr << "Rewrote BB ref: ";
unsigned fixedInstr = SparcV9CodeEmitter::getBinaryCodeForInstr(*MI);
*Ref = fixedInstr;
break;
}
}
}
BBRefs.clear();
BBLocations.clear();
return false;
}
void SparcV9CodeEmitter::emitBasicBlock(MachineBasicBlock &MBB) {
currBB = MBB.getBasicBlock();
MCE->startBasicBlock(MBB);
BBLocations[currBB] = MCE->getCurrentPCValue();
for (MachineBasicBlock::iterator I = MBB.begin(), E = MBB.end(); I != E; ++I)
emitInstruction(**I);
}
@ -155,4 +341,59 @@ void SparcV9CodeEmitter::emitInstruction(MachineInstr &MI) {
emitConstant(getBinaryCodeForInstr(MI), 4);
}
void* SparcV9CodeEmitter::getGlobalAddress(GlobalValue *V, MachineInstr &MI,
bool isPCRelative)
{
if (isPCRelative) { // must be a call, this is a major hack!
// Try looking up the function to see if it is already compiled!
if (void *Addr = (void*)(intptr_t)MCE->getGlobalValueAddress(V)) {
intptr_t CurByte = MCE->getCurrentPCValue();
// The real target of the call is Addr = PC + (target * 4)
// CurByte is the PC, Addr we just received
return (void*) (((long)Addr - (long)CurByte) >> 2);
} else {
if (Function *F = dyn_cast<Function>(V)) {
// Function has not yet been code generated!
TheJITResolver->addFunctionReference(MCE->getCurrentPCValue(),
cast<Function>(V));
// Delayed resolution...
return (void*)TheJITResolver->getLazyResolver(cast<Function>(V));
} else if (Constant *C = ConstantPointerRef::get(V)) {
if (ConstantMap.find(C) != ConstantMap.end()) {
return ConstantMap[C];
} else {
std::cerr << "Constant: 0x" << std::hex << &*C << std::dec
<< ", " << *V << " not found in ConstantMap!\n";
abort();
}
#if 0
} else if (const GlobalVariable *G = dyn_cast<GlobalVariable>(V)) {
if (G->isConstant()) {
const Constant* C = G->getInitializer();
if (ConstantMap.find(C) != ConstantMap.end()) {
return ConstantMap[C];
} else {
std::cerr << "Constant: " << *G << " not found in ConstantMap!\n";
abort();
}
} else {
std::cerr << "Variable: " << *G << " address not found!\n";
abort();
}
#endif
} else {
std::cerr << "Unhandled global: " << *V << "\n";
abort();
}
}
} else {
return convertAddress((intptr_t)MCE->getGlobalValueAddress(V),
isPCRelative);
}
}
#include "SparcV9CodeEmitter.inc"

27
llvm/lib/Target/Sparc/SparcV9CodeEmitter.h
View File

@ -9,14 +9,25 @@
#include "llvm/BasicBlock.h"
#include "llvm/CodeGen/MachineCodeEmitter.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/Target/TargetMachine.h"
class GlobalValue;
class MachineInstr;
class MachineOperand;
class SparcV9CodeEmitter : public MachineFunctionPass {
static MachineCodeEmitter *MCE;
static TargetMachine *TM;
MachineCodeEmitter *MCE;
TargetMachine *TM;
BasicBlock *currBB;
// Tracks which instruction references which BasicBlock
std::vector<std::pair<BasicBlock*,
std::pair<unsigned*,MachineInstr*> > > BBRefs;
// Tracks where each BasicBlock starts
std::map<BasicBlock*, long> BBLocations;
// Tracks locations of Constants which are laid out in memory (e.g. FP)
std::map<const Constant*, void*> ConstantMap;
public:
SparcV9CodeEmitter(TargetMachine *tm, MachineCodeEmitter &M) {
MCE = &M;
@ -27,17 +38,21 @@ public:
/// Function generated by the CodeEmitterGenerator using TableGen
///
static unsigned getBinaryCodeForInstr(MachineInstr &MI);
unsigned getBinaryCodeForInstr(MachineInstr &MI);
private:
static int64_t getMachineOpValue(MachineInstr &MI, MachineOperand &MO);
static unsigned getValueBit(int64_t Val, unsigned bit);
int64_t getMachineOpValue(MachineInstr &MI, MachineOperand &MO);
unsigned getValueBit(int64_t Val, unsigned bit);
void emitConstant(unsigned Val, unsigned Size);
void emitBasicBlock(MachineBasicBlock &MBB);
void emitInstruction(MachineInstr &MI);
void* convertAddress(intptr_t Addr, bool isPCRelative);
void* getGlobalAddress(GlobalValue *V, MachineInstr &MI,
bool isPCRelative);
};
#endif