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//===-- MachOWriter.cpp - Target-independent Mach-O Writer code -----------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the target-independent Mach-O writer. This file writes
// out the Mach-O file in the following order:
//
// #1 FatHeader (universal-only)
// #2 FatArch (universal-only, 1 per universal arch)
// Per arch:
// #3 Header
// #4 Load Commands
// #5 Sections
// #6 Relocations
// #7 Symbols
// #8 Strings
//
//===----------------------------------------------------------------------===//
#include "MachOWriter.h"
#include "llvm/Function.h"
#include "llvm/CodeGen/FileWriters.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCCodeEmitter.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/Mangler.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetLowering.h"
#include "llvm/Target/TargetLoweringObjectFile.h"
using namespace llvm;
namespace llvm {
MachineFunctionPass *createMachOWriter(formatted_raw_ostream &O,
TargetMachine &TM,
const MCAsmInfo *T,
MCCodeEmitter *MCE) {
return new MachOWriter(O, TM, T, MCE);
}
}
//===----------------------------------------------------------------------===//
// MachOWriter Implementation
//===----------------------------------------------------------------------===//
char MachOWriter::ID = 0;
MachOWriter::MachOWriter(formatted_raw_ostream &o, TargetMachine &tm,
const MCAsmInfo *T, MCCodeEmitter *MCE)
: MachineFunctionPass(&ID), O(o), TM(tm), MAI(T), MCCE(MCE),
OutContext(*new MCContext()),
OutStreamer(*createMachOStreamer(OutContext, O, MCCE)) {
}
MachOWriter::~MachOWriter() {
delete &OutStreamer;
delete &OutContext;
delete MCCE;
}
bool MachOWriter::doInitialization(Module &M) {
// Initialize TargetLoweringObjectFile.
TM.getTargetLowering()->getObjFileLowering().Initialize(OutContext, TM);
return false;
}
/// doFinalization - Now that the module has been completely processed, emit
/// the Mach-O file to 'O'.
bool MachOWriter::doFinalization(Module &M) {
OutStreamer.Finish();
return false;
}
bool MachOWriter::runOnMachineFunction(MachineFunction &MF) {
const Function *F = MF.getFunction();
TargetLoweringObjectFile &TLOF = TM.getTargetLowering()->getObjFileLowering();
const MCSection *S = TLOF.SectionForGlobal(F, Mang, TM);
OutStreamer.SwitchSection(S);
for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
I != E; ++I) {
// Print a label for the basic block.
for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
II != IE; ++II) {
const MachineInstr *MI = II;
MCInst OutMI;
OutMI.setOpcode(MI->getOpcode());
for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
const MachineOperand &MO = MI->getOperand(i);
MCOperand MCOp;
switch (MO.getType()) {
default:
MI->dump();
llvm_unreachable("unknown operand type");
case MachineOperand::MO_Register:
// Ignore all implicit register operands.
if (MO.isImplicit()) continue;
MCOp = MCOperand::CreateReg(MO.getReg());
break;
case MachineOperand::MO_Immediate:
MCOp = MCOperand::CreateImm(MO.getImm());
break;
}
OutMI.addOperand(MCOp);
}
OutStreamer.EmitInstruction(OutMI);
}
}
return false;
}
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