1//===-- Mips/MipsCodeEmitter.cpp - Convert Mips code to machine code -----===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===---------------------------------------------------------------------===// 9// 10// This file contains the pass that transforms the Mips machine instructions 11// into relocatable machine code. 12// 13//===---------------------------------------------------------------------===// 14 15#define DEBUG_TYPE "jit" 16#include "Mips.h" 17#include "MipsInstrInfo.h" 18#include "MipsRelocations.h" 19#include "MipsSubtarget.h" 20#include "MipsTargetMachine.h" 21#include "llvm/Constants.h" 22#include "llvm/DerivedTypes.h" 23#include "llvm/Function.h" 24#include "llvm/PassManager.h" 25#include "llvm/CodeGen/JITCodeEmitter.h" 26#include "llvm/CodeGen/MachineConstantPool.h" 27#include "llvm/CodeGen/MachineFunctionPass.h" 28#include "llvm/CodeGen/MachineInstr.h" 29#include "llvm/CodeGen/MachineJumpTableInfo.h" 30#include "llvm/CodeGen/MachineModuleInfo.h" 31#include "llvm/CodeGen/Passes.h" 32#include "llvm/ADT/Statistic.h" 33#include "llvm/Support/Debug.h" 34#include "llvm/Support/ErrorHandling.h" 35#include "llvm/Support/raw_ostream.h" 36#ifndef NDEBUG 37#include <iomanip> 38#endif 39 40#include "llvm/CodeGen/MachineOperand.h" 41 42using namespace llvm; 43 44STATISTIC(NumEmitted, "Number of machine instructions emitted"); 45 46namespace { 47 48class MipsCodeEmitter : public MachineFunctionPass { 49 MipsJITInfo *JTI; 50 const MipsInstrInfo *II; 51 const TargetData *TD; 52 const MipsSubtarget *Subtarget; 53 TargetMachine &TM; 54 JITCodeEmitter &MCE; 55 const std::vector<MachineConstantPoolEntry> *MCPEs; 56 const std::vector<MachineJumpTableEntry> *MJTEs; 57 bool IsPIC; 58 59 void getAnalysisUsage(AnalysisUsage &AU) const { 60 AU.addRequired<MachineModuleInfo> (); 61 MachineFunctionPass::getAnalysisUsage(AU); 62 } 63 64 static char ID; 65 66 public: 67 MipsCodeEmitter(TargetMachine &tm, JITCodeEmitter &mce) : 68 MachineFunctionPass(ID), JTI(0), 69 II((const MipsInstrInfo *) tm.getInstrInfo()), 70 TD(tm.getTargetData()), TM(tm), MCE(mce), MCPEs(0), MJTEs(0), 71 IsPIC(TM.getRelocationModel() == Reloc::PIC_) { 72 } 73 74 bool runOnMachineFunction(MachineFunction &MF); 75 76 virtual const char *getPassName() const { 77 return "Mips Machine Code Emitter"; 78 } 79 80 /// getBinaryCodeForInstr - This function, generated by the 81 /// CodeEmitterGenerator using TableGen, produces the binary encoding for 82 /// machine instructions. 83 unsigned getBinaryCodeForInstr(const MachineInstr &MI) const; 84 85 void emitInstruction(const MachineInstr &MI); 86 87 private: 88 89 void emitWordLE(unsigned Word); 90 91 /// Routines that handle operands which add machine relocations which are 92 /// fixed up by the relocation stage. 93 void emitGlobalAddress(const GlobalValue *GV, unsigned Reloc, 94 bool MayNeedFarStub) const; 95 void emitExternalSymbolAddress(const char *ES, unsigned Reloc) const; 96 void emitConstPoolAddress(unsigned CPI, unsigned Reloc) const; 97 void emitJumpTableAddress(unsigned JTIndex, unsigned Reloc) const; 98 void emitMachineBasicBlock(MachineBasicBlock *BB, unsigned Reloc) const; 99 100 /// getMachineOpValue - Return binary encoding of operand. If the machine 101 /// operand requires relocation, record the relocation and return zero. 102 unsigned getMachineOpValue(const MachineInstr &MI, 103 const MachineOperand &MO) const; 104 105 unsigned getRelocation(const MachineInstr &MI, 106 const MachineOperand &MO) const; 107 108 unsigned getMemEncoding(const MachineInstr &MI, unsigned OpNo) const; 109 unsigned getSizeExtEncoding(const MachineInstr &MI, unsigned OpNo) const; 110 unsigned getSizeInsEncoding(const MachineInstr &MI, unsigned OpNo) const; 111 }; 112} 113 114char MipsCodeEmitter::ID = 0; 115 116bool MipsCodeEmitter::runOnMachineFunction(MachineFunction &MF) { 117 JTI = ((MipsTargetMachine&) MF.getTarget()).getJITInfo(); 118 II = ((const MipsTargetMachine&) MF.getTarget()).getInstrInfo(); 119 TD = ((const MipsTargetMachine&) MF.getTarget()).getTargetData(); 120 Subtarget = &TM.getSubtarget<MipsSubtarget> (); 121 MCPEs = &MF.getConstantPool()->getConstants(); 122 MJTEs = 0; 123 if (MF.getJumpTableInfo()) MJTEs = &MF.getJumpTableInfo()->getJumpTables(); 124 JTI->Initialize(MF, IsPIC); 125 MCE.setModuleInfo(&getAnalysis<MachineModuleInfo> ()); 126 127 do { 128 DEBUG(errs() << "JITTing function '" 129 << MF.getFunction()->getName() << "'\n"); 130 MCE.startFunction(MF); 131 132 for (MachineFunction::iterator MBB = MF.begin(), E = MF.end(); 133 MBB != E; ++MBB){ 134 MCE.StartMachineBasicBlock(MBB); 135 for (MachineBasicBlock::const_iterator I = MBB->begin(), E = MBB->end(); 136 I != E; ++I) 137 emitInstruction(*I); 138 } 139 } while (MCE.finishFunction(MF)); 140 141 return false; 142} 143 144unsigned MipsCodeEmitter::getRelocation(const MachineInstr &MI, 145 const MachineOperand &MO) const { 146 // NOTE: This relocations are for static. 147 uint64_t TSFlags = MI.getDesc().TSFlags; 148 uint64_t Form = TSFlags & MipsII::FormMask; 149 if (Form == MipsII::FrmJ) 150 return Mips::reloc_mips_26; 151 if ((Form == MipsII::FrmI || Form == MipsII::FrmFI) 152 && MI.getDesc().isBranch()) 153 return Mips::reloc_mips_branch; 154 if (Form == MipsII::FrmI && MI.getOpcode() == Mips::LUi) 155 return Mips::reloc_mips_hi; 156 return Mips::reloc_mips_lo; 157} 158 159unsigned MipsCodeEmitter::getMemEncoding(const MachineInstr &MI, 160 unsigned OpNo) const { 161 // Base register is encoded in bits 20-16, offset is encoded in bits 15-0. 162 assert(MI.getOperand(OpNo).isReg()); 163 unsigned RegBits = getMachineOpValue(MI, MI.getOperand(OpNo)) << 16; 164 return 165 (getMachineOpValue(MI, MI.getOperand(OpNo+1)) & 0xFFFF) | RegBits; 166} 167 168unsigned MipsCodeEmitter::getSizeExtEncoding(const MachineInstr &MI, 169 unsigned OpNo) const { 170 // size is encoded as size-1. 171 return getMachineOpValue(MI, MI.getOperand(OpNo)) - 1; 172} 173 174unsigned MipsCodeEmitter::getSizeInsEncoding(const MachineInstr &MI, 175 unsigned OpNo) const { 176 // size is encoded as pos+size-1. 177 return getMachineOpValue(MI, MI.getOperand(OpNo-1)) + 178 getMachineOpValue(MI, MI.getOperand(OpNo)) - 1; 179} 180 181/// getMachineOpValue - Return binary encoding of operand. If the machine 182/// operand requires relocation, record the relocation and return zero. 183unsigned MipsCodeEmitter::getMachineOpValue(const MachineInstr &MI, 184 const MachineOperand &MO) const { 185 if (MO.isReg()) 186 return MipsRegisterInfo::getRegisterNumbering(MO.getReg()); 187 else if (MO.isImm()) 188 return static_cast<unsigned>(MO.getImm()); 189 else if (MO.isGlobal()) 190 emitGlobalAddress(MO.getGlobal(), getRelocation(MI, MO), true); 191 else if (MO.isSymbol()) 192 emitExternalSymbolAddress(MO.getSymbolName(), getRelocation(MI, MO)); 193 else if (MO.isCPI()) 194 emitConstPoolAddress(MO.getIndex(), getRelocation(MI, MO)); 195 else if (MO.isJTI()) 196 emitJumpTableAddress(MO.getIndex(), getRelocation(MI, MO)); 197 else if (MO.isMBB()) 198 emitMachineBasicBlock(MO.getMBB(), getRelocation(MI, MO)); 199 else 200 llvm_unreachable("Unable to encode MachineOperand!"); 201 return 0; 202} 203 204void MipsCodeEmitter::emitGlobalAddress(const GlobalValue *GV, unsigned Reloc, 205 bool MayNeedFarStub) const { 206 MCE.addRelocation(MachineRelocation::getGV(MCE.getCurrentPCOffset(), Reloc, 207 const_cast<GlobalValue *>(GV), 0, MayNeedFarStub)); 208} 209 210void MipsCodeEmitter:: 211emitExternalSymbolAddress(const char *ES, unsigned Reloc) const { 212 MCE.addRelocation(MachineRelocation::getExtSym(MCE.getCurrentPCOffset(), 213 Reloc, ES, 0, 0, false)); 214} 215 216void MipsCodeEmitter::emitConstPoolAddress(unsigned CPI, unsigned Reloc) const { 217 MCE.addRelocation(MachineRelocation::getConstPool(MCE.getCurrentPCOffset(), 218 Reloc, CPI, 0, false)); 219} 220 221void MipsCodeEmitter:: 222emitJumpTableAddress(unsigned JTIndex, unsigned Reloc) const { 223 MCE.addRelocation(MachineRelocation::getJumpTable(MCE.getCurrentPCOffset(), 224 Reloc, JTIndex, 0, false)); 225} 226 227void MipsCodeEmitter::emitMachineBasicBlock(MachineBasicBlock *BB, 228 unsigned Reloc) const { 229 MCE.addRelocation(MachineRelocation::getBB(MCE.getCurrentPCOffset(), 230 Reloc, BB)); 231} 232 233void MipsCodeEmitter::emitInstruction(const MachineInstr &MI) { 234 DEBUG(errs() << "JIT: " << (void*)MCE.getCurrentPCValue() << ":\t" << MI); 235 236 MCE.processDebugLoc(MI.getDebugLoc(), true); 237 238 // Skip pseudo instructions. 239 if ((MI.getDesc().TSFlags & MipsII::FormMask) == MipsII::Pseudo) 240 return; 241 242 ++NumEmitted; // Keep track of the # of mi's emitted 243 244 switch (MI.getOpcode()) { 245 default: 246 emitWordLE(getBinaryCodeForInstr(MI)); 247 break; 248 } 249 250 MCE.processDebugLoc(MI.getDebugLoc(), false); 251} 252 253void MipsCodeEmitter::emitWordLE(unsigned Word) { 254 DEBUG(errs() << " 0x"; 255 errs().write_hex(Word) << "\n"); 256 MCE.emitWordLE(Word); 257} 258 259/// createMipsJITCodeEmitterPass - Return a pass that emits the collected Mips 260/// code to the specified MCE object. 261FunctionPass *llvm::createMipsJITCodeEmitterPass(MipsTargetMachine &TM, 262 JITCodeEmitter &JCE) { 263 return new MipsCodeEmitter(TM, JCE); 264} 265 266#include "MipsGenCodeEmitter.inc" 267