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//===-- Alpha/AlphaCodeEmitter.cpp - Convert Alpha code to machine code ---===//
//
// The LLVM Compiler Infrastructure
//
// This file 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/JITCodeEmitter.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/Function.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/Debug.h"
using namespace llvm;
namespace {
class AlphaCodeEmitter {
MachineCodeEmitter &MCE;
public:
AlphaCodeEmitter(MachineCodeEmitter &mce) : MCE(mce) {}
/// getBinaryCodeForInstr - This function, generated by the
/// CodeEmitterGenerator using TableGen, produces the binary encoding for
/// machine instructions.
unsigned getBinaryCodeForInstr(const MachineInstr &MI);
/// getMachineOpValue - evaluates the MachineOperand of a given MachineInstr
unsigned getMachineOpValue(const MachineInstr &MI,
const MachineOperand &MO);
};
template <class CodeEmitter>
class VISIBILITY_HIDDEN Emitter : public MachineFunctionPass,
public AlphaCodeEmitter
{
const AlphaInstrInfo *II;
TargetMachine &TM;
CodeEmitter &MCE;
public:
static char ID;
explicit Emitter(TargetMachine &tm, CodeEmitter &mce)
: MachineFunctionPass(&ID), AlphaCodeEmitter(mce),
II(0), TM(tm), MCE(mce) {}
Emitter(TargetMachine &tm, CodeEmitter &mce, const AlphaInstrInfo& ii)
: MachineFunctionPass(&ID), AlphaCodeEmitter(mce),
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);
private:
void emitBasicBlock(MachineBasicBlock &MBB);
};
template <class CodeEmitter>
char Emitter<CodeEmitter>::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 Emitter<MachineCodeEmitter>(TM, MCE);
}
FunctionPass *llvm::createAlphaJITCodeEmitterPass(AlphaTargetMachine &TM,
JITCodeEmitter &JCE) {
return new Emitter<JITCodeEmitter>(TM, JCE);
}
template <class CodeEmitter>
bool Emitter<CodeEmitter>::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;
}
template <class CodeEmitter>
void Emitter<CodeEmitter>::emitBasicBlock(MachineBasicBlock &MBB) {
MCE.StartMachineBasicBlock(&MBB);
for (MachineBasicBlock::iterator I = MBB.begin(), E = MBB.end();
I != E; ++I) {
const MachineInstr &MI = *I;
switch(MI.getOpcode()) {
default:
MCE.emitWordLE(getBinaryCodeForInstr(*I));
break;
case Alpha::ALTENT:
case Alpha::PCLABEL:
case Alpha::MEMLABEL:
case TargetInstrInfo::IMPLICIT_DEF:
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();
}
}
unsigned AlphaCodeEmitter::getMachineOpValue(const MachineInstr &MI,
const MachineOperand &MO) {
unsigned rv = 0; // Return value; defaults to 0 for unhandled cases
// or things that get fixed up later by the JIT.
if (MO.isReg()) {
rv = getAlphaRegNumber(MO.getReg());
} else if (MO.isImm()) {
rv = MO.getImm();
} else if (MO.isGlobal() || MO.isSymbol() || MO.isCPI()) {
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).getImm();
break;
default:
assert(0 && "unknown relocatable instruction");
abort();
}
if (MO.isGlobal())
MCE.addRelocation(MachineRelocation::getGV(MCE.getCurrentPCOffset(),
Reloc, MO.getGlobal(), Offset,
isa<Function>(MO.getGlobal()),
useGOT));
else if (MO.isSymbol())
MCE.addRelocation(MachineRelocation::getExtSym(MCE.getCurrentPCOffset(),
Reloc, MO.getSymbolName(),
Offset, true));
else
MCE.addRelocation(MachineRelocation::getConstPool(MCE.getCurrentPCOffset(),
Reloc, MO.getIndex(), Offset));
} else if (MO.isMBB()) {
MCE.addRelocation(MachineRelocation::getBB(MCE.getCurrentPCOffset(),
Alpha::reloc_bsr, MO.getMBB()));
}else {
cerr << "ERROR: Unknown type of MachineOperand: " << MO << "\n";
abort();
}
return rv;
}
#include "AlphaGenCodeEmitter.inc"
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