| //===-- PPCCodeEmitter.cpp - JIT Code Emitter for PowerPC32 -------*- C++ -*-=// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // 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 bitcode to native PowerPC. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #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" |
| #include "llvm/Support/Compiler.h" |
| #include "llvm/Target/TargetOptions.h" |
| using namespace llvm; |
| |
| namespace { |
| class VISIBILITY_HIDDEN PPCCodeEmitter : public MachineFunctionPass { |
| TargetMachine &TM; |
| MachineCodeEmitter &MCE; |
| |
| /// 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 |
| /// |
| int getMachineOpValue(MachineInstr &MI, MachineOperand &MO); |
| |
| void getAnalysisUsage(AnalysisUsage &AU) const { |
| AU.addRequired<MachineModuleInfo>(); |
| MachineFunctionPass::getAnalysisUsage(AU); |
| } |
| |
| public: |
| static char ID; |
| PPCCodeEmitter(TargetMachine &T, MachineCodeEmitter &M) |
| : MachineFunctionPass((intptr_t)&ID), TM(T), MCE(M) {} |
| |
| const char *getPassName() const { return "PowerPC Machine Code Emitter"; } |
| |
| /// runOnMachineFunction - emits the given MachineFunction to memory |
| /// |
| bool runOnMachineFunction(MachineFunction &MF); |
| |
| /// emitBasicBlock - emits the given MachineBasicBlock to memory |
| /// |
| void emitBasicBlock(MachineBasicBlock &MBB); |
| |
| /// getValueBit - return the particular bit of Val |
| /// |
| unsigned getValueBit(int64_t Val, unsigned bit) { return (Val >> bit) & 1; } |
| |
| /// getBinaryCodeForInstr - This function, generated by the |
| /// CodeEmitterGenerator using TableGen, produces the binary encoding for |
| /// machine instructions. |
| /// |
| unsigned getBinaryCodeForInstr(MachineInstr &MI); |
| }; |
| char PPCCodeEmitter::ID = 0; |
| } |
| |
| /// 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 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!"); |
| |
| 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 PPCCodeEmitter::emitBasicBlock(MachineBasicBlock &MBB) { |
| MCE.StartMachineBasicBlock(&MBB); |
| |
| for (MachineBasicBlock::iterator I = MBB.begin(), E = MBB.end(); I != E; ++I){ |
| MachineInstr &MI = *I; |
| switch (MI.getOpcode()) { |
| default: |
| MCE.emitWordBE(getBinaryCodeForInstr(*I)); |
| break; |
| case TargetInstrInfo::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; |
| } |
| } |
| } |
| |
| int PPCCodeEmitter::getMachineOpValue(MachineInstr &MI, MachineOperand &MO) { |
| |
| intptr_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 = PPCRegisterInfo::getRegisterNumbering(MO.getReg()); |
| |
| // 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.isImmediate()) { |
| rv = MO.getImm(); |
| } else if (MO.isGlobalAddress() || MO.isExternalSymbol() || |
| MO.isConstantPoolIndex() || MO.isJumpTableIndex()) { |
| 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; |
| |
| case PPC::LWA: |
| case PPC::LD: |
| case PPC::STD: |
| case PPC::STD_32: |
| Reloc = PPC::reloc_absolute_low_ix; |
| break; |
| } |
| } |
| |
| MachineRelocation R; |
| if (MO.isGlobalAddress()) { |
| R = MachineRelocation::getGV(MCE.getCurrentPCOffset(), Reloc, |
| MO.getGlobal(), 0, |
| isa<Function>(MO.getGlobal())); |
| } else if (MO.isExternalSymbol()) { |
| R = MachineRelocation::getExtSym(MCE.getCurrentPCOffset(), |
| Reloc, MO.getSymbolName(), 0); |
| } else if (MO.isConstantPoolIndex()) { |
| R = MachineRelocation::getConstPool(MCE.getCurrentPCOffset(), |
| Reloc, MO.getIndex(), 0); |
| } else { |
| assert(MO.isJumpTableIndex()); |
| R = MachineRelocation::getJumpTable(MCE.getCurrentPCOffset(), |
| Reloc, MO.getIndex(), 0); |
| } |
| |
| // 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.isMachineBasicBlock()) { |
| 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 { |
| cerr << "ERROR: Unknown type of MachineOperand: " << MO << "\n"; |
| abort(); |
| } |
| |
| return rv; |
| } |
| |
| #include "PPCGenCodeEmitter.inc" |
| |