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321 lines
10 KiB
C++
321 lines
10 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/CodeGen/AsmPrinter.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCInst.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/MC/MCValue.h"
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#include "llvm/Target/TargetAsmInfo.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/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 TargetAsmInfo &TAI;
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AsmPrinter *Printer;
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public:
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MCAsmStreamer(MCContext &Context, raw_ostream &_OS, const TargetAsmInfo &tai,
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AsmPrinter *_AsmPrinter)
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: MCStreamer(Context), OS(_OS), TAI(tai), Printer(_AsmPrinter) {}
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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 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 EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue);
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virtual void EmitLocalSymbol(MCSymbol *Symbol, const MCValue &Value);
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virtual void EmitCommonSymbol(MCSymbol *Symbol, unsigned Size,
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unsigned Pow2Alignment, bool IsLocal);
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virtual void EmitZerofill(MCSection *Section, MCSymbol *Symbol = NULL,
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unsigned Size = 0, unsigned Pow2Alignment = 0);
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virtual void EmitBytes(const StringRef &Data);
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virtual void EmitValue(const MCValue &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 MCValue &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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/// Allow printing symbols directly to a raw_ostream with proper quoting.
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static inline raw_ostream &operator<<(raw_ostream &os, const MCSymbol *S) {
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S->print(os);
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return os;
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}
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/// Allow printing values directly to a raw_ostream.
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static inline raw_ostream &operator<<(raw_ostream &os, const MCValue &Value) {
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Value.print(os);
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return os;
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}
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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 MCValue truncateToSize(const MCValue &Value, unsigned Bytes) {
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return MCValue::get(Value.getSymA(), Value.getSymB(),
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truncateToSize(Value.getConstant(), Bytes));
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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(TAI, OS);
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}
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}
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void MCAsmStreamer::EmitLabel(MCSymbol *Symbol) {
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assert(Symbol->getSection() == 0 && "Cannot emit a symbol twice!");
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assert(CurSection && "Cannot emit before setting section!");
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assert(!getContext().GetSymbolValue(Symbol) &&
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"Cannot emit symbol which was directly assigned to!");
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OS << Symbol << ":\n";
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Symbol->setSection(CurSection);
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Symbol->setExternal(false);
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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 MCValue &Value,
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bool MakeAbsolute) {
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assert(!Symbol->getSection() && "Cannot assign to a label!");
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if (MakeAbsolute) {
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OS << ".set " << Symbol << ", " << Value << '\n';
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// HACK: If the value isn't already absolute, set the symbol value to
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// itself, we want to use the .set absolute value, not the actual
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// expression.
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if (!Value.isAbsolute())
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getContext().SetSymbolValue(Symbol, MCValue::get(Symbol));
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else
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getContext().SetSymbolValue(Symbol, Value);
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} else {
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OS << Symbol << " = " << Value << '\n';
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getContext().SetSymbolValue(Symbol, Value);
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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 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::EmitLocalSymbol(MCSymbol *Symbol, const MCValue &Value) {
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OS << ".lsym" << ' ' << Symbol << ',' << Value << '\n';
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}
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void MCAsmStreamer::EmitCommonSymbol(MCSymbol *Symbol, unsigned Size,
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unsigned Pow2Alignment, bool IsLocal) {
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if (IsLocal)
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OS << ".lcomm";
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else
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OS << ".comm";
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OS << ' ' << Symbol << ',' << Size;
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if (Pow2Alignment != 0)
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OS << ',' << Pow2Alignment;
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OS << '\n';
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}
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void MCAsmStreamer::EmitZerofill(MCSection *Section, MCSymbol *Symbol,
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unsigned Size, unsigned Pow2Alignment) {
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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 (Pow2Alignment != 0)
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OS << ',' << Pow2Alignment;
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}
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OS << '\n';
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}
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void MCAsmStreamer::EmitBytes(const 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 MCValue &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 << TAI.getAlignDirective(); break;
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// FIXME: use TAI 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 (TAI.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 << ", " << 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 TAI.
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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 MCValue &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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static raw_ostream &operator<<(raw_ostream &OS, const MCOperand &Op) {
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if (Op.isReg())
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return OS << "reg:" << Op.getReg();
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if (Op.isImm())
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return OS << "imm:" << Op.getImm();
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if (Op.isMBBLabel())
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return OS << "mbblabel:("
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<< Op.getMBBLabelFunction() << ", " << Op.getMBBLabelBlock();
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assert(Op.isMCValue() && "Invalid operand!");
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return OS << "val:" << Op.getMCValue();
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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 (Printer) {
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Printer->printMCInst(&Inst);
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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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OS << "MCInst("
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<< "opcode=" << Inst.getOpcode() << ", "
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<< "operands=[";
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for (unsigned i = 0, e = Inst.getNumOperands(); i != e; ++i) {
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if (i)
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OS << ", ";
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OS << Inst.getOperand(i);
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}
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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 TargetAsmInfo &TAI, AsmPrinter *AP) {
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return new MCAsmStreamer(Context, OS, TAI, AP);
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}
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