1 //===-- Alpha/AlphaCodeEmitter.cpp - Convert Alpha 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 Alpha machine instructions
11 // into relocatable machine code.
13 //===----------------------------------------------------------------------===//
15 #define DEBUG_TYPE "alpha-emitter"
16 #include "AlphaTargetMachine.h"
17 #include "AlphaRelocations.h"
19 #include "llvm/PassManager.h"
20 #include "llvm/CodeGen/MachineCodeEmitter.h"
21 #include "llvm/CodeGen/JITCodeEmitter.h"
22 #include "llvm/CodeGen/ObjectCodeEmitter.h"
23 #include "llvm/CodeGen/MachineFunctionPass.h"
24 #include "llvm/CodeGen/MachineInstr.h"
25 #include "llvm/CodeGen/Passes.h"
26 #include "llvm/Function.h"
27 #include "llvm/Support/Compiler.h"
28 #include "llvm/Support/Debug.h"
29 #include "llvm/Support/ErrorHandling.h"
30 #include "llvm/Support/raw_ostream.h"
35 class AlphaCodeEmitter {
36 MachineCodeEmitter &MCE;
38 AlphaCodeEmitter(MachineCodeEmitter &mce) : MCE(mce) {}
40 /// getBinaryCodeForInstr - This function, generated by the
41 /// CodeEmitterGenerator using TableGen, produces the binary encoding for
42 /// machine instructions.
44 unsigned getBinaryCodeForInstr(const MachineInstr &MI);
46 /// getMachineOpValue - evaluates the MachineOperand of a given MachineInstr
48 unsigned getMachineOpValue(const MachineInstr &MI,
49 const MachineOperand &MO);
52 template <class CodeEmitter>
53 class VISIBILITY_HIDDEN Emitter : public MachineFunctionPass,
54 public AlphaCodeEmitter
56 const AlphaInstrInfo *II;
62 explicit Emitter(TargetMachine &tm, CodeEmitter &mce)
63 : MachineFunctionPass(&ID), AlphaCodeEmitter(mce),
64 II(0), TM(tm), MCE(mce) {}
65 Emitter(TargetMachine &tm, CodeEmitter &mce, const AlphaInstrInfo& ii)
66 : MachineFunctionPass(&ID), AlphaCodeEmitter(mce),
67 II(&ii), TM(tm), MCE(mce) {}
69 bool runOnMachineFunction(MachineFunction &MF);
71 virtual const char *getPassName() const {
72 return "Alpha Machine Code Emitter";
75 void emitInstruction(const MachineInstr &MI);
78 void emitBasicBlock(MachineBasicBlock &MBB);
81 template <class CodeEmitter>
82 char Emitter<CodeEmitter>::ID = 0;
85 /// createAlphaCodeEmitterPass - Return a pass that emits the collected Alpha
86 /// code to the specified MCE object.
88 FunctionPass *llvm::createAlphaCodeEmitterPass(AlphaTargetMachine &TM,
89 MachineCodeEmitter &MCE) {
90 return new Emitter<MachineCodeEmitter>(TM, MCE);
93 FunctionPass *llvm::createAlphaJITCodeEmitterPass(AlphaTargetMachine &TM,
94 JITCodeEmitter &JCE) {
95 return new Emitter<JITCodeEmitter>(TM, JCE);
97 FunctionPass *llvm::createAlphaObjectCodeEmitterPass(AlphaTargetMachine &TM,
98 ObjectCodeEmitter &OCE) {
99 return new Emitter<ObjectCodeEmitter>(TM, OCE);
102 template <class CodeEmitter>
103 bool Emitter<CodeEmitter>::runOnMachineFunction(MachineFunction &MF) {
104 II = ((AlphaTargetMachine&)MF.getTarget()).getInstrInfo();
107 MCE.startFunction(MF);
108 for (MachineFunction::iterator I = MF.begin(), E = MF.end(); I != E; ++I)
110 } while (MCE.finishFunction(MF));
115 template <class CodeEmitter>
116 void Emitter<CodeEmitter>::emitBasicBlock(MachineBasicBlock &MBB) {
117 MCE.StartMachineBasicBlock(&MBB);
118 for (MachineBasicBlock::iterator I = MBB.begin(), E = MBB.end();
120 const MachineInstr &MI = *I;
121 switch(MI.getOpcode()) {
123 MCE.emitWordLE(getBinaryCodeForInstr(*I));
127 case Alpha::MEMLABEL:
128 case TargetInstrInfo::IMPLICIT_DEF:
134 static unsigned getAlphaRegNumber(unsigned Reg) {
136 case Alpha::R0 : case Alpha::F0 : return 0;
137 case Alpha::R1 : case Alpha::F1 : return 1;
138 case Alpha::R2 : case Alpha::F2 : return 2;
139 case Alpha::R3 : case Alpha::F3 : return 3;
140 case Alpha::R4 : case Alpha::F4 : return 4;
141 case Alpha::R5 : case Alpha::F5 : return 5;
142 case Alpha::R6 : case Alpha::F6 : return 6;
143 case Alpha::R7 : case Alpha::F7 : return 7;
144 case Alpha::R8 : case Alpha::F8 : return 8;
145 case Alpha::R9 : case Alpha::F9 : return 9;
146 case Alpha::R10 : case Alpha::F10 : return 10;
147 case Alpha::R11 : case Alpha::F11 : return 11;
148 case Alpha::R12 : case Alpha::F12 : return 12;
149 case Alpha::R13 : case Alpha::F13 : return 13;
150 case Alpha::R14 : case Alpha::F14 : return 14;
151 case Alpha::R15 : case Alpha::F15 : return 15;
152 case Alpha::R16 : case Alpha::F16 : return 16;
153 case Alpha::R17 : case Alpha::F17 : return 17;
154 case Alpha::R18 : case Alpha::F18 : return 18;
155 case Alpha::R19 : case Alpha::F19 : return 19;
156 case Alpha::R20 : case Alpha::F20 : return 20;
157 case Alpha::R21 : case Alpha::F21 : return 21;
158 case Alpha::R22 : case Alpha::F22 : return 22;
159 case Alpha::R23 : case Alpha::F23 : return 23;
160 case Alpha::R24 : case Alpha::F24 : return 24;
161 case Alpha::R25 : case Alpha::F25 : return 25;
162 case Alpha::R26 : case Alpha::F26 : return 26;
163 case Alpha::R27 : case Alpha::F27 : return 27;
164 case Alpha::R28 : case Alpha::F28 : return 28;
165 case Alpha::R29 : case Alpha::F29 : return 29;
166 case Alpha::R30 : case Alpha::F30 : return 30;
167 case Alpha::R31 : case Alpha::F31 : return 31;
169 llvm_unreachable("Unhandled reg");
173 unsigned AlphaCodeEmitter::getMachineOpValue(const MachineInstr &MI,
174 const MachineOperand &MO) {
176 unsigned rv = 0; // Return value; defaults to 0 for unhandled cases
177 // or things that get fixed up later by the JIT.
180 rv = getAlphaRegNumber(MO.getReg());
181 } else if (MO.isImm()) {
183 } else if (MO.isGlobal() || MO.isSymbol() || MO.isCPI()) {
184 DOUT << MO << " is a relocated op for " << MI << "\n";
188 switch (MI.getOpcode()) {
190 Reloc = Alpha::reloc_bsr;
205 Reloc = Alpha::reloc_gprellow;
208 Reloc = Alpha::reloc_gprelhigh;
211 Reloc = Alpha::reloc_literal;
216 Reloc = Alpha::reloc_gpdist;
217 Offset = MI.getOperand(3).getImm();
220 llvm_unreachable("unknown relocatable instruction");
223 MCE.addRelocation(MachineRelocation::getGV(MCE.getCurrentPCOffset(),
224 Reloc, MO.getGlobal(), Offset,
225 isa<Function>(MO.getGlobal()),
227 else if (MO.isSymbol())
228 MCE.addRelocation(MachineRelocation::getExtSym(MCE.getCurrentPCOffset(),
229 Reloc, MO.getSymbolName(),
232 MCE.addRelocation(MachineRelocation::getConstPool(MCE.getCurrentPCOffset(),
233 Reloc, MO.getIndex(), Offset));
234 } else if (MO.isMBB()) {
235 MCE.addRelocation(MachineRelocation::getBB(MCE.getCurrentPCOffset(),
236 Alpha::reloc_bsr, MO.getMBB()));
239 cerr << "ERROR: Unknown type of MachineOperand: " << MO << "\n";
247 #include "AlphaGenCodeEmitter.inc"