1 //===-- Mips/MipsCodeEmitter.cpp - Convert Mips Code to Machine Code ------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===---------------------------------------------------------------------===//
10 // This file contains the pass that transforms the Mips machine instructions
11 // into relocatable machine code.
13 //===---------------------------------------------------------------------===//
15 #define DEBUG_TYPE "jit"
17 #include "MCTargetDesc/MipsBaseInfo.h"
18 #include "MipsInstrInfo.h"
19 #include "MipsRelocations.h"
20 #include "MipsSubtarget.h"
21 #include "MipsTargetMachine.h"
22 #include "llvm/ADT/Statistic.h"
23 #include "llvm/CodeGen/JITCodeEmitter.h"
24 #include "llvm/CodeGen/MachineConstantPool.h"
25 #include "llvm/CodeGen/MachineFunctionPass.h"
26 #include "llvm/CodeGen/MachineInstr.h"
27 #include "llvm/CodeGen/MachineJumpTableInfo.h"
28 #include "llvm/CodeGen/MachineModuleInfo.h"
29 #include "llvm/CodeGen/MachineOperand.h"
30 #include "llvm/CodeGen/Passes.h"
31 #include "llvm/Constants.h"
32 #include "llvm/DerivedTypes.h"
33 #include "llvm/PassManager.h"
34 #include "llvm/Support/Debug.h"
35 #include "llvm/Support/ErrorHandling.h"
36 #include "llvm/Support/raw_ostream.h"
43 STATISTIC(NumEmitted, "Number of machine instructions emitted");
47 class MipsCodeEmitter : public MachineFunctionPass {
49 const MipsInstrInfo *II;
51 const MipsSubtarget *Subtarget;
54 const std::vector<MachineConstantPoolEntry> *MCPEs;
55 const std::vector<MachineJumpTableEntry> *MJTEs;
58 void getAnalysisUsage(AnalysisUsage &AU) const {
59 AU.addRequired<MachineModuleInfo> ();
60 MachineFunctionPass::getAnalysisUsage(AU);
66 MipsCodeEmitter(TargetMachine &tm, JITCodeEmitter &mce) :
67 MachineFunctionPass(ID), JTI(0),
68 II((const MipsInstrInfo *) tm.getInstrInfo()),
69 TD(tm.getDataLayout()), TM(tm), MCE(mce), MCPEs(0), MJTEs(0),
70 IsPIC(TM.getRelocationModel() == Reloc::PIC_) {
73 bool runOnMachineFunction(MachineFunction &MF);
75 virtual const char *getPassName() const {
76 return "Mips Machine Code Emitter";
79 /// getBinaryCodeForInstr - This function, generated by the
80 /// CodeEmitterGenerator using TableGen, produces the binary encoding for
81 /// machine instructions.
82 uint64_t getBinaryCodeForInstr(const MachineInstr &MI) const;
84 void emitInstruction(const MachineInstr &MI);
88 void emitWord(unsigned Word);
90 /// Routines that handle operands which add machine relocations which are
91 /// fixed up by the relocation stage.
92 void emitGlobalAddress(const GlobalValue *GV, unsigned Reloc,
93 bool MayNeedFarStub) const;
94 void emitExternalSymbolAddress(const char *ES, unsigned Reloc) const;
95 void emitConstPoolAddress(unsigned CPI, unsigned Reloc) const;
96 void emitJumpTableAddress(unsigned JTIndex, unsigned Reloc) const;
97 void emitMachineBasicBlock(MachineBasicBlock *BB, unsigned Reloc) const;
99 /// getMachineOpValue - Return binary encoding of operand. If the machine
100 /// operand requires relocation, record the relocation and return zero.
101 unsigned getMachineOpValue(const MachineInstr &MI,
102 const MachineOperand &MO) const;
104 unsigned getRelocation(const MachineInstr &MI,
105 const MachineOperand &MO) const;
107 unsigned getJumpTargetOpValue(const MachineInstr &MI, unsigned OpNo) const;
109 unsigned getBranchTargetOpValue(const MachineInstr &MI,
110 unsigned OpNo) const;
111 unsigned getMemEncoding(const MachineInstr &MI, unsigned OpNo) const;
112 unsigned getSizeExtEncoding(const MachineInstr &MI, unsigned OpNo) const;
113 unsigned getSizeInsEncoding(const MachineInstr &MI, unsigned OpNo) const;
115 void emitGlobalAddressUnaligned(const GlobalValue *GV, unsigned Reloc,
120 char MipsCodeEmitter::ID = 0;
122 bool MipsCodeEmitter::runOnMachineFunction(MachineFunction &MF) {
123 JTI = ((MipsTargetMachine&) MF.getTarget()).getJITInfo();
124 II = ((const MipsTargetMachine&) MF.getTarget()).getInstrInfo();
125 TD = ((const MipsTargetMachine&) MF.getTarget()).getDataLayout();
126 Subtarget = &TM.getSubtarget<MipsSubtarget> ();
127 MCPEs = &MF.getConstantPool()->getConstants();
129 if (MF.getJumpTableInfo()) MJTEs = &MF.getJumpTableInfo()->getJumpTables();
130 JTI->Initialize(MF, IsPIC, Subtarget->isLittle());
131 MCE.setModuleInfo(&getAnalysis<MachineModuleInfo> ());
134 DEBUG(errs() << "JITTing function '"
135 << MF.getName() << "'\n");
136 MCE.startFunction(MF);
138 for (MachineFunction::iterator MBB = MF.begin(), E = MF.end();
140 MCE.StartMachineBasicBlock(MBB);
141 for (MachineBasicBlock::instr_iterator I = MBB->instr_begin(),
142 E = MBB->instr_end(); I != E; ++I)
145 } while (MCE.finishFunction(MF));
150 unsigned MipsCodeEmitter::getRelocation(const MachineInstr &MI,
151 const MachineOperand &MO) const {
152 // NOTE: This relocations are for static.
153 uint64_t TSFlags = MI.getDesc().TSFlags;
154 uint64_t Form = TSFlags & MipsII::FormMask;
155 if (Form == MipsII::FrmJ)
156 return Mips::reloc_mips_26;
157 if ((Form == MipsII::FrmI || Form == MipsII::FrmFI)
159 return Mips::reloc_mips_pc16;
160 if (Form == MipsII::FrmI && MI.getOpcode() == Mips::LUi)
161 return Mips::reloc_mips_hi;
162 return Mips::reloc_mips_lo;
165 unsigned MipsCodeEmitter::getJumpTargetOpValue(const MachineInstr &MI,
166 unsigned OpNo) const {
167 MachineOperand MO = MI.getOperand(OpNo);
169 emitGlobalAddress(MO.getGlobal(), getRelocation(MI, MO), true);
170 else if (MO.isSymbol())
171 emitExternalSymbolAddress(MO.getSymbolName(), getRelocation(MI, MO));
173 emitMachineBasicBlock(MO.getMBB(), getRelocation(MI, MO));
175 llvm_unreachable("Unexpected jump target operand kind.");
179 unsigned MipsCodeEmitter::getBranchTargetOpValue(const MachineInstr &MI,
180 unsigned OpNo) const {
181 MachineOperand MO = MI.getOperand(OpNo);
182 emitMachineBasicBlock(MO.getMBB(), getRelocation(MI, MO));
186 unsigned MipsCodeEmitter::getMemEncoding(const MachineInstr &MI,
187 unsigned OpNo) const {
188 // Base register is encoded in bits 20-16, offset is encoded in bits 15-0.
189 assert(MI.getOperand(OpNo).isReg());
190 unsigned RegBits = getMachineOpValue(MI, MI.getOperand(OpNo)) << 16;
191 return (getMachineOpValue(MI, MI.getOperand(OpNo+1)) & 0xFFFF) | RegBits;
194 unsigned MipsCodeEmitter::getSizeExtEncoding(const MachineInstr &MI,
195 unsigned OpNo) const {
196 // size is encoded as size-1.
197 return getMachineOpValue(MI, MI.getOperand(OpNo)) - 1;
200 unsigned MipsCodeEmitter::getSizeInsEncoding(const MachineInstr &MI,
201 unsigned OpNo) const {
202 // size is encoded as pos+size-1.
203 return getMachineOpValue(MI, MI.getOperand(OpNo-1)) +
204 getMachineOpValue(MI, MI.getOperand(OpNo)) - 1;
207 /// getMachineOpValue - Return binary encoding of operand. If the machine
208 /// operand requires relocation, record the relocation and return zero.
209 unsigned MipsCodeEmitter::getMachineOpValue(const MachineInstr &MI,
210 const MachineOperand &MO) const {
212 return TM.getRegisterInfo()->getEncodingValue(MO.getReg());
214 return static_cast<unsigned>(MO.getImm());
215 else if (MO.isGlobal())
216 emitGlobalAddress(MO.getGlobal(), getRelocation(MI, MO), true);
217 else if (MO.isSymbol())
218 emitExternalSymbolAddress(MO.getSymbolName(), getRelocation(MI, MO));
220 emitConstPoolAddress(MO.getIndex(), getRelocation(MI, MO));
222 emitJumpTableAddress(MO.getIndex(), getRelocation(MI, MO));
224 emitMachineBasicBlock(MO.getMBB(), getRelocation(MI, MO));
226 llvm_unreachable("Unable to encode MachineOperand!");
230 void MipsCodeEmitter::emitGlobalAddress(const GlobalValue *GV, unsigned Reloc,
231 bool MayNeedFarStub) const {
232 MCE.addRelocation(MachineRelocation::getGV(MCE.getCurrentPCOffset(), Reloc,
233 const_cast<GlobalValue *>(GV), 0,
237 void MipsCodeEmitter::emitGlobalAddressUnaligned(const GlobalValue *GV,
238 unsigned Reloc, int Offset) const {
239 MCE.addRelocation(MachineRelocation::getGV(MCE.getCurrentPCOffset(), Reloc,
240 const_cast<GlobalValue *>(GV), 0, false));
241 MCE.addRelocation(MachineRelocation::getGV(MCE.getCurrentPCOffset() + Offset,
242 Reloc, const_cast<GlobalValue *>(GV), 0, false));
245 void MipsCodeEmitter::
246 emitExternalSymbolAddress(const char *ES, unsigned Reloc) const {
247 MCE.addRelocation(MachineRelocation::getExtSym(MCE.getCurrentPCOffset(),
251 void MipsCodeEmitter::emitConstPoolAddress(unsigned CPI, unsigned Reloc) const {
252 MCE.addRelocation(MachineRelocation::getConstPool(MCE.getCurrentPCOffset(),
253 Reloc, CPI, 0, false));
256 void MipsCodeEmitter::
257 emitJumpTableAddress(unsigned JTIndex, unsigned Reloc) const {
258 MCE.addRelocation(MachineRelocation::getJumpTable(MCE.getCurrentPCOffset(),
259 Reloc, JTIndex, 0, false));
262 void MipsCodeEmitter::emitMachineBasicBlock(MachineBasicBlock *BB,
263 unsigned Reloc) const {
264 MCE.addRelocation(MachineRelocation::getBB(MCE.getCurrentPCOffset(),
268 void MipsCodeEmitter::emitInstruction(const MachineInstr &MI) {
269 DEBUG(errs() << "JIT: " << (void*)MCE.getCurrentPCValue() << ":\t" << MI);
271 MCE.processDebugLoc(MI.getDebugLoc(), true);
273 // Skip pseudo instructions.
274 if ((MI.getDesc().TSFlags & MipsII::FormMask) == MipsII::Pseudo)
277 emitWord(getBinaryCodeForInstr(MI));
278 ++NumEmitted; // Keep track of the # of mi's emitted
280 MCE.processDebugLoc(MI.getDebugLoc(), false);
283 void MipsCodeEmitter::emitWord(unsigned Word) {
284 DEBUG(errs() << " 0x";
285 errs().write_hex(Word) << "\n");
286 if (Subtarget->isLittle())
287 MCE.emitWordLE(Word);
289 MCE.emitWordBE(Word);
292 /// createMipsJITCodeEmitterPass - Return a pass that emits the collected Mips
293 /// code to the specified MCE object.
294 FunctionPass *llvm::createMipsJITCodeEmitterPass(MipsTargetMachine &TM,
295 JITCodeEmitter &JCE) {
296 return new MipsCodeEmitter(TM, JCE);
299 #include "MipsGenCodeEmitter.inc"