forked from OSchip/llvm-project
144 lines
3.9 KiB
C++
144 lines
3.9 KiB
C++
//===- lib/MC/MCAsmStreamer.cpp - Text Assembly Output --------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/MC/MCAtom.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCSection.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/MC/MCValue.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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namespace {
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class MCAsmStreamer : public MCStreamer {
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raw_ostream &OS;
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MCSection *CurSection;
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public:
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MCAsmStreamer(MCContext &Context, raw_ostream &_OS)
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: MCStreamer(Context), OS(_OS) {}
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~MCAsmStreamer() {}
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/// @name MCStreamer Interface
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/// @{
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virtual void SwitchSection(MCSection *Section);
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virtual void EmitLabel(MCSymbol *Symbol);
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virtual void EmitAssignment(MCSymbol *Symbol, const MCValue &Value,
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bool MakeAbsolute = false);
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virtual void EmitSymbolAttribute(MCSymbol *Symbol, SymbolAttr Attribute);
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virtual void EmitBytes(const char *Data, unsigned Length);
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virtual void EmitValue(const MCValue &Value, unsigned Size);
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virtual void EmitInstruction(const MCInst &Inst);
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virtual void Finish();
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/// @}
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};
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}
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/// Allow printing values directly to a raw_ostream.
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inline raw_ostream &operator<<(raw_ostream &os, const MCValue &Value) {
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if (Value.getSymA()) {
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os << Value.getSymA()->getName();
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if (Value.getSymB())
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os << " - " << Value.getSymB()->getName();
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if (Value.getCst())
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os << " + " << Value.getCst();
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} else {
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assert(!Value.getSymB() && "Invalid machine code value!");
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os << Value.getCst();
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}
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return os;
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}
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void MCAsmStreamer::SwitchSection(MCSection *Section) {
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if (Section != CurSection) {
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CurSection = Section;
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// FIXME: Really we would like the segment, flags, etc. to be separate
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// values instead of embedded in the name. Not all assemblers understand all
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// this stuff though.
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OS << ".section " << Section->getName() << "\n";
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}
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}
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void MCAsmStreamer::EmitLabel(MCSymbol *Symbol) {
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// FIXME: We need to enforce that we aren't printing atoms which are more
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// complicated than the assembler understands.
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//assert(Symbol->getAtom()->getSection() == CurSection &&
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// "The label for a symbol must match its section!");
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OS << Symbol->getName() << ":\n";
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}
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void MCAsmStreamer::EmitAssignment(MCSymbol *Symbol, const MCValue &Value,
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bool MakeAbsolute) {
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if (MakeAbsolute) {
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OS << ".set " << Symbol->getName() << ", " << Value << '\n';
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} else {
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OS << Symbol->getName() << " = " << Value << '\n';
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}
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}
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void MCAsmStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
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SymbolAttr Attribute) {
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switch (Attribute) {
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case Global: OS << ".globl"; break;
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case Weak: OS << ".weak"; break;
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case PrivateExtern: OS << ".private_extern"; break;
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}
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OS << ' ' << Symbol->getName() << '\n';
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}
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void MCAsmStreamer::EmitBytes(const char *Data, unsigned Length) {
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for (unsigned i = 0; i != Length; ++i) {
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OS << ".byte " << (unsigned) Data[i] << '\n';
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}
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}
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void MCAsmStreamer::EmitValue(const MCValue &Value, unsigned Size) {
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// Need target hooks to know how to print this.
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switch (Size) {
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default:
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assert(0 && "Invalid size for machine code value!");
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case 1: OS << ".byte"; break;
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case 2: OS << ".hword"; break;
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case 4: OS << ".long"; break;
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case 8: OS << ".quad"; break;
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}
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OS << ' ' << Value << '\n';
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}
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void MCAsmStreamer::EmitInstruction(const MCInst &Inst) {
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// FIXME: Implement.
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OS << "# FIXME: Implement instruction printing!\n";
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}
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void MCAsmStreamer::Finish() {
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OS.flush();
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}
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MCStreamer *llvm::createAsmStreamer(MCContext &Context, raw_ostream &OS) {
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return new MCAsmStreamer(Context, OS);
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}
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