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299 lines
9.4 KiB
C++
299 lines
9.4 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/ADT/SmallString.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCCodeEmitter.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCInst.h"
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#include "llvm/MC/MCInstPrinter.h"
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#include "llvm/MC/MCSectionMachO.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/MathExtras.h"
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#include "llvm/Support/Format.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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const MCAsmInfo &MAI;
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MCInstPrinter *InstPrinter;
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MCCodeEmitter *Emitter;
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public:
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MCAsmStreamer(MCContext &Context, raw_ostream &_OS, const MCAsmInfo &tai,
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MCInstPrinter *_Printer, MCCodeEmitter *_Emitter)
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: MCStreamer(Context), OS(_OS), MAI(tai), InstPrinter(_Printer),
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Emitter(_Emitter) {}
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~MCAsmStreamer() {}
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/// @name MCStreamer Interface
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/// @{
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virtual void SwitchSection(const MCSection *Section);
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virtual void EmitLabel(MCSymbol *Symbol);
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virtual void EmitAssemblerFlag(AssemblerFlag Flag);
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virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value);
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virtual void EmitSymbolAttribute(MCSymbol *Symbol, SymbolAttr Attribute);
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virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue);
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virtual void EmitCommonSymbol(MCSymbol *Symbol, unsigned Size,
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unsigned ByteAlignment);
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virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = 0,
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unsigned Size = 0, unsigned ByteAlignment = 0);
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virtual void EmitBytes(StringRef Data);
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virtual void EmitValue(const MCExpr *Value, unsigned Size);
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virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
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unsigned ValueSize = 1,
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unsigned MaxBytesToEmit = 0);
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virtual void EmitValueToOffset(const MCExpr *Offset,
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unsigned char Value = 0);
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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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} // end anonymous namespace.
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static inline int64_t truncateToSize(int64_t Value, unsigned Bytes) {
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assert(Bytes && "Invalid size!");
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return Value & ((uint64_t) (int64_t) -1 >> (64 - Bytes * 8));
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}
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static inline const MCExpr *truncateToSize(const MCExpr *Value,
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unsigned Bytes) {
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// FIXME: Do we really need this routine?
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return Value;
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}
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void MCAsmStreamer::SwitchSection(const MCSection *Section) {
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assert(Section && "Cannot switch to a null section!");
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if (Section != CurSection) {
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CurSection = Section;
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Section->PrintSwitchToSection(MAI, OS);
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}
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}
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void MCAsmStreamer::EmitLabel(MCSymbol *Symbol) {
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assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
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assert(CurSection && "Cannot emit before setting section!");
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OS << *Symbol << ":\n";
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Symbol->setSection(*CurSection);
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}
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void MCAsmStreamer::EmitAssemblerFlag(AssemblerFlag Flag) {
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switch (Flag) {
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default: assert(0 && "Invalid flag!");
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case SubsectionsViaSymbols: OS << ".subsections_via_symbols"; break;
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}
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OS << '\n';
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}
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void MCAsmStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
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// Only absolute symbols can be redefined.
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assert((Symbol->isUndefined() || Symbol->isAbsolute()) &&
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"Cannot define a symbol twice!");
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OS << *Symbol << " = " << *Value << '\n';
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// FIXME: Lift context changes into super class.
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// FIXME: Set associated section.
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Symbol->setValue(Value);
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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 Hidden: OS << ".hidden"; break;
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case IndirectSymbol: OS << ".indirect_symbol"; break;
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case Internal: OS << ".internal"; break;
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case LazyReference: OS << ".lazy_reference"; break;
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case NoDeadStrip: OS << ".no_dead_strip"; break;
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case PrivateExtern: OS << ".private_extern"; break;
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case Protected: OS << ".protected"; break;
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case Reference: OS << ".reference"; break;
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case Weak: OS << ".weak"; break;
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case WeakDefinition: OS << ".weak_definition"; break;
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case WeakReference: OS << ".weak_reference"; break;
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}
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OS << ' ' << *Symbol << '\n';
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}
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void MCAsmStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
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OS << ".desc" << ' ' << *Symbol << ',' << DescValue << '\n';
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}
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void MCAsmStreamer::EmitCommonSymbol(MCSymbol *Symbol, unsigned Size,
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unsigned ByteAlignment) {
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OS << MAI.getCOMMDirective() << *Symbol << ',' << Size;
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if (ByteAlignment != 0 && MAI.getCOMMDirectiveTakesAlignment()) {
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if (MAI.getAlignmentIsInBytes())
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OS << ',' << ByteAlignment;
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else
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OS << ',' << Log2_32(ByteAlignment);
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}
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OS << '\n';
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}
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void MCAsmStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
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unsigned Size, unsigned ByteAlignment) {
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// Note: a .zerofill directive does not switch sections.
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OS << ".zerofill ";
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// This is a mach-o specific directive.
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const MCSectionMachO *MOSection = ((const MCSectionMachO*)Section);
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OS << MOSection->getSegmentName() << "," << MOSection->getSectionName();
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if (Symbol != NULL) {
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OS << ',' << *Symbol << ',' << Size;
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if (ByteAlignment != 0)
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OS << ',' << Log2_32(ByteAlignment);
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}
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OS << '\n';
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}
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void MCAsmStreamer::EmitBytes(StringRef Data) {
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assert(CurSection && "Cannot emit contents before setting section!");
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for (unsigned i = 0, e = Data.size(); i != e; ++i)
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OS << ".byte " << (unsigned) (unsigned char) Data[i] << '\n';
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}
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void MCAsmStreamer::EmitValue(const MCExpr *Value, unsigned Size) {
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assert(CurSection && "Cannot emit contents before setting section!");
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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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llvm_unreachable("Invalid size for machine code value!");
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case 1: OS << ".byte"; break;
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case 2: OS << ".short"; 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 << ' ' << *truncateToSize(Value, Size) << '\n';
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}
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void MCAsmStreamer::EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
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unsigned ValueSize,
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unsigned MaxBytesToEmit) {
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// Some assemblers don't support non-power of two alignments, so we always
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// emit alignments as a power of two if possible.
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if (isPowerOf2_32(ByteAlignment)) {
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switch (ValueSize) {
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default: llvm_unreachable("Invalid size for machine code value!");
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case 1: OS << MAI.getAlignDirective(); break;
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// FIXME: use MAI for this!
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case 2: OS << ".p2alignw "; break;
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case 4: OS << ".p2alignl "; break;
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case 8: llvm_unreachable("Unsupported alignment size!");
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}
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if (MAI.getAlignmentIsInBytes())
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OS << ByteAlignment;
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else
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OS << Log2_32(ByteAlignment);
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if (Value || MaxBytesToEmit) {
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OS << ", 0x";
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OS.write_hex(truncateToSize(Value, ValueSize));
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if (MaxBytesToEmit)
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OS << ", " << MaxBytesToEmit;
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}
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OS << '\n';
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return;
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}
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// Non-power of two alignment. This is not widely supported by assemblers.
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// FIXME: Parameterize this based on MAI.
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switch (ValueSize) {
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default: llvm_unreachable("Invalid size for machine code value!");
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case 1: OS << ".balign"; break;
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case 2: OS << ".balignw"; break;
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case 4: OS << ".balignl"; break;
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case 8: llvm_unreachable("Unsupported alignment size!");
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}
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OS << ' ' << ByteAlignment;
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OS << ", " << truncateToSize(Value, ValueSize);
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if (MaxBytesToEmit)
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OS << ", " << MaxBytesToEmit;
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OS << '\n';
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}
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void MCAsmStreamer::EmitValueToOffset(const MCExpr *Offset,
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unsigned char Value) {
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// FIXME: Verify that Offset is associated with the current section.
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OS << ".org " << *Offset << ", " << (unsigned) Value << '\n';
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}
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void MCAsmStreamer::EmitInstruction(const MCInst &Inst) {
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assert(CurSection && "Cannot emit contents before setting section!");
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// If we have an AsmPrinter, use that to print.
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if (InstPrinter) {
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InstPrinter->printInst(&Inst);
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OS << '\n';
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// Show the encoding if we have a code emitter.
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if (Emitter) {
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SmallString<256> Code;
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raw_svector_ostream VecOS(Code);
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Emitter->EncodeInstruction(Inst, VecOS);
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VecOS.flush();
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OS.indent(20);
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OS << " # encoding: [";
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for (unsigned i = 0, e = Code.size(); i != e; ++i) {
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if (i)
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OS << ',';
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OS << format("%#04x", uint8_t(Code[i]));
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}
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OS << "]\n";
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}
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return;
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}
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// Otherwise fall back to a structural printing for now. Eventually we should
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// always have access to the target specific printer.
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Inst.print(OS, &MAI);
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OS << '\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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const MCAsmInfo &MAI, MCInstPrinter *IP,
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MCCodeEmitter *CE) {
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return new MCAsmStreamer(Context, OS, MAI, IP, CE);
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}
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