| //===-- Alpha/AlphaCodeEmitter.cpp - Convert Alpha code to machine code ---===// |
| // |
| // 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 contains the pass that transforms the Alpha machine instructions |
| // into relocatable machine code. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #define DEBUG_TYPE "alpha-emitter" |
| #include "AlphaTargetMachine.h" |
| #include "AlphaRelocations.h" |
| #include "Alpha.h" |
| #include "llvm/PassManager.h" |
| #include "llvm/CodeGen/MachineCodeEmitter.h" |
| #include "llvm/CodeGen/MachineFunctionPass.h" |
| #include "llvm/CodeGen/MachineInstr.h" |
| #include "llvm/CodeGen/Passes.h" |
| #include "llvm/Function.h" |
| #include "llvm/Support/Debug.h" |
| using namespace llvm; |
| |
| namespace { |
| class AlphaCodeEmitter : public MachineFunctionPass { |
| const AlphaInstrInfo *II; |
| TargetMachine &TM; |
| MachineCodeEmitter &MCE; |
| |
| /// getMachineOpValue - evaluates the MachineOperand of a given MachineInstr |
| /// |
| int getMachineOpValue(MachineInstr &MI, MachineOperand &MO); |
| |
| public: |
| static char ID; |
| explicit AlphaCodeEmitter(TargetMachine &tm, MachineCodeEmitter &mce) |
| : MachineFunctionPass((intptr_t)&ID), II(0), TM(tm), MCE(mce) {} |
| AlphaCodeEmitter(TargetMachine &tm, MachineCodeEmitter &mce, |
| const AlphaInstrInfo& ii) |
| : MachineFunctionPass((intptr_t)&ID), II(&ii), TM(tm), MCE(mce) {} |
| |
| bool runOnMachineFunction(MachineFunction &MF); |
| |
| virtual const char *getPassName() const { |
| return "Alpha Machine Code Emitter"; |
| } |
| |
| void emitInstruction(const MachineInstr &MI); |
| |
| /// getBinaryCodeForInstr - This function, generated by the |
| /// CodeEmitterGenerator using TableGen, produces the binary encoding for |
| /// machine instructions. |
| /// |
| unsigned getBinaryCodeForInstr(MachineInstr &MI); |
| |
| private: |
| void emitBasicBlock(MachineBasicBlock &MBB); |
| |
| }; |
| char AlphaCodeEmitter::ID = 0; |
| } |
| |
| /// createAlphaCodeEmitterPass - Return a pass that emits the collected Alpha code |
| /// to the specified MCE object. |
| FunctionPass *llvm::createAlphaCodeEmitterPass(AlphaTargetMachine &TM, |
| MachineCodeEmitter &MCE) { |
| return new AlphaCodeEmitter(TM, MCE); |
| } |
| |
| bool AlphaCodeEmitter::runOnMachineFunction(MachineFunction &MF) { |
| II = ((AlphaTargetMachine&)MF.getTarget()).getInstrInfo(); |
| |
| do { |
| MCE.startFunction(MF); |
| for (MachineFunction::iterator I = MF.begin(), E = MF.end(); I != E; ++I) |
| emitBasicBlock(*I); |
| } while (MCE.finishFunction(MF)); |
| |
| return false; |
| } |
| |
| void AlphaCodeEmitter::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.emitWordLE(getBinaryCodeForInstr(*I)); |
| break; |
| case Alpha::ALTENT: |
| case Alpha::PCLABEL: |
| case Alpha::MEMLABEL: |
| case Alpha::IDEF_I: |
| case Alpha::IDEF_F32: |
| case Alpha::IDEF_F64: |
| break; //skip these |
| } |
| } |
| } |
| |
| static unsigned getAlphaRegNumber(unsigned Reg) { |
| switch (Reg) { |
| case Alpha::R0 : case Alpha::F0 : return 0; |
| case Alpha::R1 : case Alpha::F1 : return 1; |
| case Alpha::R2 : case Alpha::F2 : return 2; |
| case Alpha::R3 : case Alpha::F3 : return 3; |
| case Alpha::R4 : case Alpha::F4 : return 4; |
| case Alpha::R5 : case Alpha::F5 : return 5; |
| case Alpha::R6 : case Alpha::F6 : return 6; |
| case Alpha::R7 : case Alpha::F7 : return 7; |
| case Alpha::R8 : case Alpha::F8 : return 8; |
| case Alpha::R9 : case Alpha::F9 : return 9; |
| case Alpha::R10 : case Alpha::F10 : return 10; |
| case Alpha::R11 : case Alpha::F11 : return 11; |
| case Alpha::R12 : case Alpha::F12 : return 12; |
| case Alpha::R13 : case Alpha::F13 : return 13; |
| case Alpha::R14 : case Alpha::F14 : return 14; |
| case Alpha::R15 : case Alpha::F15 : return 15; |
| case Alpha::R16 : case Alpha::F16 : return 16; |
| case Alpha::R17 : case Alpha::F17 : return 17; |
| case Alpha::R18 : case Alpha::F18 : return 18; |
| case Alpha::R19 : case Alpha::F19 : return 19; |
| case Alpha::R20 : case Alpha::F20 : return 20; |
| case Alpha::R21 : case Alpha::F21 : return 21; |
| case Alpha::R22 : case Alpha::F22 : return 22; |
| case Alpha::R23 : case Alpha::F23 : return 23; |
| case Alpha::R24 : case Alpha::F24 : return 24; |
| case Alpha::R25 : case Alpha::F25 : return 25; |
| case Alpha::R26 : case Alpha::F26 : return 26; |
| case Alpha::R27 : case Alpha::F27 : return 27; |
| case Alpha::R28 : case Alpha::F28 : return 28; |
| case Alpha::R29 : case Alpha::F29 : return 29; |
| case Alpha::R30 : case Alpha::F30 : return 30; |
| case Alpha::R31 : case Alpha::F31 : return 31; |
| default: |
| assert(0 && "Unhandled reg"); |
| abort(); |
| } |
| } |
| |
| int AlphaCodeEmitter::getMachineOpValue(MachineInstr &MI, MachineOperand &MO) { |
| |
| int rv = 0; // Return value; defaults to 0 for unhandled cases |
| // or things that get fixed up later by the JIT. |
| |
| if (MO.isRegister()) { |
| rv = getAlphaRegNumber(MO.getReg()); |
| } else if (MO.isImmediate()) { |
| rv = MO.getImmedValue(); |
| } else if (MO.isGlobalAddress() || MO.isExternalSymbol() |
| || MO.isConstantPoolIndex()) { |
| DOUT << MO << " is a relocated op for " << MI << "\n"; |
| unsigned Reloc = 0; |
| int Offset = 0; |
| bool useGOT = false; |
| switch (MI.getOpcode()) { |
| case Alpha::BSR: |
| Reloc = Alpha::reloc_bsr; |
| break; |
| case Alpha::LDLr: |
| case Alpha::LDQr: |
| case Alpha::LDBUr: |
| case Alpha::LDWUr: |
| case Alpha::LDSr: |
| case Alpha::LDTr: |
| case Alpha::LDAr: |
| case Alpha::STQr: |
| case Alpha::STLr: |
| case Alpha::STWr: |
| case Alpha::STBr: |
| case Alpha::STSr: |
| case Alpha::STTr: |
| Reloc = Alpha::reloc_gprellow; |
| break; |
| case Alpha::LDAHr: |
| Reloc = Alpha::reloc_gprelhigh; |
| break; |
| case Alpha::LDQl: |
| Reloc = Alpha::reloc_literal; |
| useGOT = true; |
| break; |
| case Alpha::LDAg: |
| case Alpha::LDAHg: |
| Reloc = Alpha::reloc_gpdist; |
| Offset = MI.getOperand(3).getImmedValue(); |
| break; |
| default: |
| assert(0 && "unknown relocatable instruction"); |
| abort(); |
| } |
| if (MO.isGlobalAddress()) |
| MCE.addRelocation(MachineRelocation::getGV(MCE.getCurrentPCOffset(), |
| Reloc, MO.getGlobal(), Offset, |
| false, useGOT)); |
| else if (MO.isExternalSymbol()) |
| MCE.addRelocation(MachineRelocation::getExtSym(MCE.getCurrentPCOffset(), |
| Reloc, MO.getSymbolName(), Offset, |
| true)); |
| else |
| MCE.addRelocation(MachineRelocation::getConstPool(MCE.getCurrentPCOffset(), |
| Reloc, MO.getConstantPoolIndex(), |
| Offset)); |
| } else if (MO.isMachineBasicBlock()) { |
| MCE.addRelocation(MachineRelocation::getBB(MCE.getCurrentPCOffset(), |
| Alpha::reloc_bsr, |
| MO.getMachineBasicBlock())); |
| }else { |
| cerr << "ERROR: Unknown type of MachineOperand: " << MO << "\n"; |
| abort(); |
| } |
| |
| return rv; |
| } |
| |
| |
| #include "AlphaGenCodeEmitter.inc" |
| |
