-//===-- PPC32CodeEmitter.cpp - JIT Code Emitter for PowerPC32 -----*- C++ -*-=//
-//
+//===-- PPCCodeEmitter.cpp - JIT Code Emitter for PowerPC32 -------*- C++ -*-=//
+//
// The LLVM Compiler Infrastructure
//
-// This file was developed by the LLVM research group and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
-//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
//===----------------------------------------------------------------------===//
-//
+//
// This file defines the PowerPC 32-bit CodeEmitter and associated machinery to
-// JIT-compile bytecode to native PowerPC.
+// JIT-compile bitcode to native PowerPC.
//
//===----------------------------------------------------------------------===//
-#include "PPC32JITInfo.h"
-#include "PPC32TargetMachine.h"
-#include "PowerPC.h"
+#include "PPCTargetMachine.h"
+#include "PPCRelocations.h"
+#include "PPC.h"
#include "llvm/Module.h"
+#include "llvm/PassManager.h"
#include "llvm/CodeGen/MachineCodeEmitter.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
+#include "llvm/CodeGen/MachineInstrBuilder.h"
+#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/Passes.h"
-#include "llvm/Support/Debug.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();
-}
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/Compiler.h"
+#include "llvm/Target/TargetOptions.h"
+using namespace llvm;
namespace {
- class PPC32CodeEmitter : public MachineFunctionPass {
+ class VISIBILITY_HIDDEN PPCCodeEmitter : 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;
-
+ /// MovePCtoLROffset - When/if we see a MovePCtoLR instruction, we record
+ /// its address in the function into this pointer.
+ void *MovePCtoLROffset;
+
/// getMachineOpValue - evaluates the MachineOperand of a given MachineInstr
///
- int64_t getMachineOpValue(MachineInstr &MI, MachineOperand &MO);
-
- unsigned getAddressOfExternalFunction(Function *F);
+ unsigned getMachineOpValue(const MachineInstr &MI, const MachineOperand &MO);
+
+ void getAnalysisUsage(AnalysisUsage &AU) const {
+ AU.addRequired<MachineModuleInfo>();
+ MachineFunctionPass::getAnalysisUsage(AU);
+ }
public:
- PPC32CodeEmitter(TargetMachine &T, MachineCodeEmitter &M)
- : TM(T), MCE(M) {}
+ static char ID;
+ PPCCodeEmitter(TargetMachine &T, MachineCodeEmitter &M)
+ : MachineFunctionPass(&ID), TM(T), MCE(M) {}
const char *getPassName() const { return "PowerPC Machine Code Emitter"; }
///
void emitBasicBlock(MachineBasicBlock &MBB);
- /// emitWord - write a 32-bit word to memory at the current PC
- ///
- void emitWord(unsigned w) { MCE.emitWord(w); }
-
/// getValueBit - return the particular bit of Val
///
unsigned getValueBit(int64_t Val, unsigned bit) { return (Val >> bit) & 1; }
/// CodeEmitterGenerator using TableGen, produces the binary encoding for
/// machine instructions.
///
- unsigned getBinaryCodeForInstr(MachineInstr &MI);
+ unsigned getBinaryCodeForInstr(const MachineInstr &MI);
};
+ char PPCCodeEmitter::ID = 0;
}
-/// addPassesToEmitMachineCode - Add passes to the specified pass manager to get
-/// machine code emitted. This uses a MachineCodeEmitter object to handle
-/// actually outputting the machine code and resolving things like the address
-/// of functions. This method should returns true if machine code emission is
-/// not supported.
-///
-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));
- // Delete machine code for this function after emitting it
- PM.add(createMachineCodeDeleter());
- return false;
+/// createPPCCodeEmitterPass - Return a pass that emits the collected PPC code
+/// to the specified MCE object.
+FunctionPass *llvm::createPPCCodeEmitterPass(PPCTargetMachine &TM,
+ MachineCodeEmitter &MCE) {
+ return new PPCCodeEmitter(TM, MCE);
}
-bool PPC32CodeEmitter::runOnMachineFunction(MachineFunction &MF) {
- MCE.startFunction(MF);
- MCE.emitConstantPool(MF.getConstantPool());
- for (MachineFunction::iterator BB = MF.begin(), E = MF.end(); BB != E; ++BB)
- emitBasicBlock(*BB);
- MCE.finishFunction(MF);
+bool PPCCodeEmitter::runOnMachineFunction(MachineFunction &MF) {
+ assert((MF.getTarget().getRelocationModel() != Reloc::Default ||
+ MF.getTarget().getRelocationModel() != Reloc::Static) &&
+ "JIT relocation model must be set to static or default!");
- // 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();
+ MCE.setModuleInfo(&getAnalysis<MachineModuleInfo>());
+ do {
+ MovePCtoLROffset = 0;
+ MCE.startFunction(MF);
+ for (MachineFunction::iterator BB = MF.begin(), E = MF.end(); BB != E; ++BB)
+ emitBasicBlock(*BB);
+ } while (MCE.finishFunction(MF));
return false;
}
-void PPC32CodeEmitter::emitBasicBlock(MachineBasicBlock &MBB) {
- BBLocations[MBB.getBasicBlock()] = MCE.getCurrentPCValue();
+void PPCCodeEmitter::emitBasicBlock(MachineBasicBlock &MBB) {
+ MCE.StartMachineBasicBlock(&MBB);
+
for (MachineBasicBlock::iterator I = MBB.begin(), E = MBB.end(); I != E; ++I){
- MachineInstr &MI = *I;
- unsigned Opcode = MI.getOpcode();
- if (Opcode == PPC::IMPLICIT_DEF) continue;
-
- emitWord(getBinaryCodeForInstr(*I));
+ const MachineInstr &MI = *I;
+ switch (MI.getOpcode()) {
+ default:
+ MCE.emitWordBE(getBinaryCodeForInstr(MI));
+ break;
+ case TargetInstrInfo::DBG_LABEL:
+ case TargetInstrInfo::EH_LABEL:
+ MCE.emitLabel(MI.getOperand(0).getImm());
+ break;
+ case TargetInstrInfo::IMPLICIT_DEF:
+ break; // pseudo opcode, no side effects
+ case PPC::MovePCtoLR:
+ case PPC::MovePCtoLR8:
+ assert(TM.getRelocationModel() == Reloc::PIC_);
+ MovePCtoLROffset = (void*)MCE.getCurrentPCValue();
+ MCE.emitWordBE(0x48000005); // bl 1
+ break;
+ }
}
}
-unsigned PPC32CodeEmitter::getAddressOfExternalFunction(Function *F) {
- static std::map<Function*, unsigned> ExternalFn2Addr;
- std::map<Function*, unsigned>::iterator Addr = ExternalFn2Addr.find(F);
+unsigned PPCCodeEmitter::getMachineOpValue(const MachineInstr &MI,
+ const MachineOperand &MO) {
- if (Addr == ExternalFn2Addr.end())
- ExternalFn2Addr[F] = MCE.forceCompilationOf(F);
- return ExternalFn2Addr[F];
-}
+ unsigned rv = 0; // Return value; defaults to 0 for unhandled cases
+ // or things that get fixed up later by the JIT.
+ if (MO.isReg()) {
+ rv = PPCRegisterInfo::getRegisterNumbering(MO.getReg());
-static unsigned enumRegToMachineReg(unsigned enumReg) {
- switch (enumReg) {
- case PPC::R0 : case PPC::F0 : return 0;
- case PPC::R1 : case PPC::F1 : return 1;
- case PPC::R2 : case PPC::F2 : return 2;
- case PPC::R3 : case PPC::F3 : return 3;
- case PPC::R4 : case PPC::F4 : return 4;
- case PPC::R5 : case PPC::F5 : return 5;
- case PPC::R6 : case PPC::F6 : return 6;
- case PPC::R7 : case PPC::F7 : return 7;
- case PPC::R8 : case PPC::F8 : return 8;
- case PPC::R9 : case PPC::F9 : return 9;
- case PPC::R10: case PPC::F10: return 10;
- case PPC::R11: case PPC::F11: return 11;
- case PPC::R12: case PPC::F12: return 12;
- case PPC::R13: case PPC::F13: return 13;
- case PPC::R14: case PPC::F14: return 14;
- case PPC::R15: case PPC::F15: return 15;
- case PPC::R16: case PPC::F16: return 16;
- case PPC::R17: case PPC::F17: return 17;
- case PPC::R18: case PPC::F18: return 18;
- case PPC::R19: case PPC::F19: return 19;
- case PPC::R20: case PPC::F20: return 20;
- case PPC::R21: case PPC::F21: return 21;
- case PPC::R22: case PPC::F22: return 22;
- case PPC::R23: case PPC::F23: return 23;
- case PPC::R24: case PPC::F24: return 24;
- case PPC::R25: case PPC::F25: return 25;
- case PPC::R26: case PPC::F26: return 26;
- case PPC::R27: case PPC::F27: return 27;
- case PPC::R28: case PPC::F28: return 28;
- case PPC::R29: case PPC::F29: return 29;
- case PPC::R30: case PPC::F30: return 30;
- case PPC::R31: case PPC::F31: return 31;
- default:
- std::cerr << "Unhandled reg in enumRegToRealReg!\n";
- abort();
- }
-}
+ // Special encoding for MTCRF and MFOCRF, which uses a bit mask for the
+ // register, not the register number directly.
+ if ((MI.getOpcode() == PPC::MTCRF || MI.getOpcode() == PPC::MFOCRF) &&
+ (MO.getReg() >= PPC::CR0 && MO.getReg() <= PPC::CR7)) {
+ rv = 0x80 >> rv;
+ }
+ } else if (MO.isImm()) {
+ rv = MO.getImm();
+ } else if (MO.isGlobal() || MO.isSymbol() ||
+ MO.isCPI() || MO.isJTI()) {
+ unsigned Reloc = 0;
+ if (MI.getOpcode() == PPC::BL_Macho || MI.getOpcode() == PPC::BL8_Macho ||
+ MI.getOpcode() == PPC::BL_ELF || MI.getOpcode() == PPC::BL8_ELF ||
+ MI.getOpcode() == PPC::TAILB || MI.getOpcode() == PPC::TAILB8)
+ Reloc = PPC::reloc_pcrel_bx;
+ else {
+ if (TM.getRelocationModel() == Reloc::PIC_) {
+ assert(MovePCtoLROffset && "MovePCtoLR not seen yet?");
+ }
+ switch (MI.getOpcode()) {
+ default: MI.dump(); assert(0 && "Unknown instruction for relocation!");
+ case PPC::LIS:
+ case PPC::LIS8:
+ case PPC::ADDIS:
+ case PPC::ADDIS8:
+ Reloc = PPC::reloc_absolute_high; // Pointer to symbol
+ break;
+ case PPC::LI:
+ case PPC::LI8:
+ case PPC::LA:
+ // Loads.
+ case PPC::LBZ:
+ case PPC::LBZ8:
+ case PPC::LHA:
+ case PPC::LHA8:
+ case PPC::LHZ:
+ case PPC::LHZ8:
+ case PPC::LWZ:
+ case PPC::LWZ8:
+ case PPC::LFS:
+ case PPC::LFD:
+
+ // Stores.
+ case PPC::STB:
+ case PPC::STB8:
+ case PPC::STH:
+ case PPC::STH8:
+ case PPC::STW:
+ case PPC::STW8:
+ case PPC::STFS:
+ case PPC::STFD:
+ Reloc = PPC::reloc_absolute_low;
+ break;
-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.isRegister()) {
- rv = enumRegToMachineReg(MO.getReg());
- } else if (MO.isImmediate()) {
- rv = MO.getImmedValue();
- } 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());
- if (!rv) {
- std::cerr << "PPC32CodeEmitter: External global addr not found: "
- << *GVar;
- abort();
- }
- } else {
- std::cerr << "PPC32CodeEmitter: global addr not found: " << *GVar;
- abort();
- }
+ case PPC::LWA:
+ case PPC::LD:
+ case PPC::STD:
+ case PPC::STD_32:
+ Reloc = PPC::reloc_absolute_low_ix;
+ break;
}
}
- if (MO.isPCRelative()) { // Global variable reference
- rv = (Addr - MCE.getCurrentPCValue()) >> 2;
+
+ MachineRelocation R;
+ if (MO.isGlobal()) {
+ R = MachineRelocation::getGV(MCE.getCurrentPCOffset(), Reloc,
+ MO.getGlobal(), 0,
+ isa<Function>(MO.getGlobal()));
+ } else if (MO.isSymbol()) {
+ R = MachineRelocation::getExtSym(MCE.getCurrentPCOffset(),
+ Reloc, MO.getSymbolName(), 0);
+ } else if (MO.isCPI()) {
+ R = MachineRelocation::getConstPool(MCE.getCurrentPCOffset(),
+ Reloc, MO.getIndex(), 0);
+ } else {
+ assert(MO.isJTI());
+ R = MachineRelocation::getJumpTable(MCE.getCurrentPCOffset(),
+ Reloc, MO.getIndex(), 0);
}
- } else if (MO.isMachineBasicBlock()) {
- 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.getConstantPoolIndex();
- rv = MCE.getConstantPoolEntryAddress(index);
- } else if (MO.isFrameIndex()) {
- std::cerr << "PPC32CodeEmitter: error: Frame index unhandled!\n";
- abort();
+
+ // If in PIC mode, we need to encode the negated address of the
+ // 'movepctolr' into the unrelocated field. After relocation, we'll have
+ // &gv-&movepctolr-4 in the imm field. Once &movepctolr is added to the imm
+ // field, we get &gv. This doesn't happen for branch relocations, which are
+ // always implicitly pc relative.
+ if (TM.getRelocationModel() == Reloc::PIC_ && Reloc != PPC::reloc_pcrel_bx){
+ assert(MovePCtoLROffset && "MovePCtoLR not seen yet?");
+ R.setConstantVal(-(intptr_t)MovePCtoLROffset - 4);
+ }
+ MCE.addRelocation(R);
+
+ } else if (MO.isMBB()) {
+ unsigned Reloc = 0;
+ unsigned Opcode = MI.getOpcode();
+ if (Opcode == PPC::B || Opcode == PPC::BL_Macho ||
+ Opcode == PPC::BLA_Macho || Opcode == PPC::BL_ELF ||
+ Opcode == PPC::BLA_ELF)
+ Reloc = PPC::reloc_pcrel_bx;
+ else // BCC instruction
+ Reloc = PPC::reloc_pcrel_bcx;
+ MCE.addRelocation(MachineRelocation::getBB(MCE.getCurrentPCOffset(),
+ Reloc, MO.getMBB()));
} else {
- std::cerr << "ERROR: Unknown type of MachineOperand: " << MO << "\n";
+ cerr << "ERROR: Unknown type of MachineOperand: " << MO << "\n";
abort();
}
- // Special treatment for global symbols: constants and vars
- if (MO.isConstantPoolIndex() || MO.isGlobalAddress()) {
- unsigned Opcode = MI.getOpcode();
- int64_t MBBLoc = BBLocations[MI.getParent()->getBasicBlock()];
- if (Opcode == PPC::LOADHiAddr) {
- // LoadHiAddr wants hi16(addr - mbb)
- rv = (rv - MBBLoc) >> 16;
- } else if (Opcode == PPC::LWZ || Opcode == PPC::LA ||
- Opcode == PPC::LFS || Opcode == PPC::LFD) {
- // These load opcodes want lo16(addr - mbb)
- rv = (rv - MBBLoc) & 0xffff;
- }
- }
-
return rv;
}
-
-void *PPC32JITInfo::getJITStubForFunction(Function *F, MachineCodeEmitter &MCE){
- return (void*)((unsigned long)getResolver(MCE).getLazyResolver(F));
-}
-
-void PPC32JITInfo::replaceMachineCodeForFunction (void *Old, void *New) {
- std::cerr << "PPC32JITInfo::replaceMachineCodeForFunction not implemented\n";
- abort();
-}
-
-#include "PPC32GenCodeEmitter.inc"
-
-} // end llvm namespace
+#include "PPCGenCodeEmitter.inc"
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