#include "PPC32JITInfo.h"
#include "PPC32TargetMachine.h"
+#include "llvm/Module.h"
#include "llvm/CodeGen/MachineCodeEmitter.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/Passes.h"
namespace llvm {
+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);
+ };
+
+ static JITResolver &getResolver(MachineCodeEmitter &MCE) {
+ static JITResolver *TheJITResolver = 0;
+ if (TheJITResolver == 0)
+ TheJITResolver = new JITResolver(MCE);
+ return *TheJITResolver;
+ }
+}
+
+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;
+
+ unsigned Stub = emitStubForFunction(F);
+ LazyResolverMap.insert(I, std::make_pair(F, Stub));
+ return Stub;
+}
+
+/// 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);
+}
+
+/// 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) {
+ std::cerr << "PPC32CodeEmitter::emitStubForFunction() unimplemented!\n";
+ abort();
+ return 0;
+}
+
+void JITResolver::CompilationCallback() {
+ std::cerr << "PPC32CodeEmitter: CompilationCallback() unimplemented!";
+ abort();
+}
+
namespace {
class PPC32CodeEmitter : public MachineFunctionPass {
TargetMachine &TM;
MachineCodeEmitter &MCE;
+ // Tracks which instruction references which BasicBlock
+ std::vector<std::pair<const BasicBlock*,
+ std::pair<unsigned*,MachineInstr*> > > BBRefs;
+ // Tracks where each BasicBlock starts
+ std::map<const BasicBlock*, long> BBLocations;
+
+ /// getMachineOpValue - evaluates the MachineOperand of a given MachineInstr
+ ///
int64_t getMachineOpValue(MachineInstr &MI, MachineOperand &MO);
+ unsigned getAddressOfExternalFunction(Function *F);
+
public:
PPC32CodeEmitter(TargetMachine &T, MachineCodeEmitter &M)
: TM(T), MCE(M) {}
///
unsigned getValueBit(int64_t Val, unsigned bit) { return (Val >> bit) & 1; }
- /// getBinaryCodeForInstr - returns the assembled code for an instruction
+ /// getBinaryCodeForInstr - This function, generated by the
+ /// CodeEmitterGenerator using TableGen, produces the binary encoding for
+ /// machine instructions.
///
unsigned getBinaryCodeForInstr(MachineInstr &MI);
};
///
bool PPC32TargetMachine::addPassesToEmitMachineCode(FunctionPassManager &PM,
MachineCodeEmitter &MCE) {
+ // Keep as `true' until this is a functional JIT to allow llvm-gcc to build
+ return true;
+
// Machine code emitter pass for PowerPC
- PM.add(new PPC32CodeEmitter(*this, MCE));
+ MachineCodeEmitter *M = &MCE;
+ DEBUG(M = MachineCodeEmitter::createDebugEmitter(MCE));
+ PM.add(new PPC32CodeEmitter(*this, *M));
// Delete machine code for this function after emitting it
PM.add(createMachineCodeDeleter());
return false;
bool PPC32CodeEmitter::runOnMachineFunction(MachineFunction &MF) {
MCE.startFunction(MF);
MCE.emitConstantPool(MF.getConstantPool());
- for (MachineFunction::iterator I = MF.begin(), E = MF.end(); I != E; ++I)
- emitBasicBlock(*I);
+ for (MachineFunction::iterator BB = MF.begin(), E = MF.end(); BB != E; ++BB)
+ emitBasicBlock(*BB);
MCE.finishFunction(MF);
+
+ // 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;
+ DEBUG(std::cerr << "Fixup @ " << std::hex << Ref << " to 0x" << Location
+ << " in instr: " << std::dec << *MI);
+ 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 + (branchTarget * 4), so undo that arithmetic here:
+ // Location is the target of the branch
+ // Ref is the location of the instruction, and hence the PC
+ int64_t branchTarget = (Location - (long)Ref) >> 2;
+ MI->SetMachineOperandConst(ii, MachineOperand::MO_SignExtendedImmed,
+ branchTarget);
+ unsigned fixedInstr = PPC32CodeEmitter::getBinaryCodeForInstr(*MI);
+ MCE.emitWordAt(fixedInstr, Ref);
+ break;
+ }
+ }
+ }
+ BBRefs.clear();
+ BBLocations.clear();
+
return false;
}
emitWord(getBinaryCodeForInstr(*I));
}
+unsigned PPC32CodeEmitter::getAddressOfExternalFunction(Function *F) {
+ static std::map<Function*, unsigned> ExternalFn2Addr;
+ std::map<Function*, unsigned>::iterator Addr = ExternalFn2Addr.find(F);
+
+ if (Addr == ExternalFn2Addr.end())
+ ExternalFn2Addr[F] = MCE.forceCompilationOf(F);
+ return ExternalFn2Addr[F];
+}
+
int64_t PPC32CodeEmitter::getMachineOpValue(MachineInstr &MI,
MachineOperand &MO) {
int64_t rv = 0; // Return value; defaults to 0 for unhandled cases
// or things that get fixed up later by the JIT.
- if (MO.isPCRelativeDisp()) {
- std::cerr << "PPC32CodeEmitter: PC-relative disp unhandled\n";
- abort();
- } else if (MO.isRegister()) {
+ if (MO.isRegister()) {
rv = MO.getReg();
} else if (MO.isImmediate()) {
rv = MO.getImmedValue();
-#if 0
} else if (MO.isGlobalAddress()) {
+ GlobalValue *GV = MO.getGlobal();
+ intptr_t Addr = (intptr_t)MCE.getGlobalValueAddress(GV);
+ if (Addr == 0) {
+ if (Function *F = dyn_cast<Function>(GV)) {
+ if (F->isExternal())
+ rv = getAddressOfExternalFunction(F);
+ else {
+ // Function has not yet been code generated!
+ getResolver(MCE).addFunctionReference(MCE.getCurrentPCValue(), F);
+ // Delayed resolution...
+ return (intptr_t)getResolver(MCE).getLazyResolver(F);
+ }
+ } else if (GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV)) {
+ if (GVar->isExternal())
+ rv = MCE.getGlobalValueAddress(MO.getSymbolName());
+ else {
+ std::cerr << "PPC32CodeEmitter: External global addr not found: "
+ << *GVar;
+ abort();
+ }
+ }
+ }
+ if (MO.isPCRelative()) { // Global variable reference
+ rv = (Addr - MCE.getCurrentPCValue()) >> 2;
+ }
} else if (MO.isMachineBasicBlock()) {
- MachineBasicBlock *MBB = MO.getMachineBasicBlock();
- } else if (MO.isExternalSymbol()) {
- } else if (MO.isFrameIndex()) {
- unsigned index = MO.getFrameIndex();
+ const BasicBlock *BB = MO.getMachineBasicBlock()->getBasicBlock();
+ unsigned* CurrPC = (unsigned*)(intptr_t)MCE.getCurrentPCValue();
+ BBRefs.push_back(std::make_pair(BB, std::make_pair(CurrPC, &MI)));
} else if (MO.isConstantPoolIndex()) {
- unsigned index = MO.getCosntantPoolIndex();
-#endif
+ unsigned index = MO.getConstantPoolIndex();
+ rv = MCE.getConstantPoolEntryAddress(index);
+ } else if (MO.isFrameIndex()) {
+ std::cerr << "PPC32CodeEmitter: error: Frame index unhandled!\n";
+ abort();
} else {
std::cerr << "ERROR: Unknown type of MachineOperand: " << MO << "\n";
abort();
}
-void *PPC32JITInfo::getJITStubForFunction(Function *F,
- MachineCodeEmitter &MCE) {
- std::cerr << "PPC32JITInfo::getJITStubForFunction not implemented\n";
- abort();
- return 0;
+void *PPC32JITInfo::getJITStubForFunction(Function *F, MachineCodeEmitter &MCE){
+ return (void*)((unsigned long)getResolver(MCE).getLazyResolver(F));
}
void PPC32JITInfo::replaceMachineCodeForFunction (void *Old, void *New) {
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