1 //===- lib/MC/MCAsmStreamer.cpp - Text Assembly Output --------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #include "llvm/MC/MCStreamer.h"
12 #include "llvm/MC/MCContext.h"
13 #include "llvm/MC/MCSection.h"
14 #include "llvm/MC/MCSymbol.h"
15 #include "llvm/MC/MCValue.h"
16 #include "llvm/Support/raw_ostream.h"
21 class MCAsmStreamer : public MCStreamer {
24 MCSection *CurSection;
27 MCAsmStreamer(MCContext &Context, raw_ostream &_OS)
28 : MCStreamer(Context), OS(_OS) {}
31 /// @name MCStreamer Interface
34 virtual void SwitchSection(MCSection *Section);
36 virtual void EmitLabel(MCSymbol *Symbol);
38 virtual void EmitAssignment(MCSymbol *Symbol, const MCValue &Value,
39 bool MakeAbsolute = false);
41 virtual void EmitSymbolAttribute(MCSymbol *Symbol, SymbolAttr Attribute);
43 virtual void EmitBytes(const char *Data, unsigned Length);
45 virtual void EmitValue(const MCValue &Value, unsigned Size);
47 virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
48 unsigned ValueSize = 1,
49 unsigned MaxBytesToEmit = 0);
51 virtual void EmitValueToOffset(const MCValue &Offset,
52 unsigned char Value = 0);
54 virtual void EmitInstruction(const MCInst &Inst);
56 virtual void Finish();
63 /// Allow printing values directly to a raw_ostream.
64 static inline raw_ostream &operator<<(raw_ostream &os, const MCValue &Value) {
65 if (Value.getSymA()) {
66 os << Value.getSymA()->getName();
68 os << " - " << Value.getSymB()->getName();
69 if (Value.getConstant())
70 os << " + " << Value.getConstant();
72 assert(!Value.getSymB() && "Invalid machine code value!");
73 os << Value.getConstant();
79 static inline int64_t truncateToSize(int64_t Value, unsigned Bytes) {
80 assert(Bytes && "Invalid size!");
81 return Value & ((uint64_t) (int64_t) -1 >> (64 - Bytes * 8));
84 static inline MCValue truncateToSize(const MCValue &Value, unsigned Bytes) {
85 return MCValue::get(Value.getSymA(), Value.getSymB(),
86 truncateToSize(Value.getConstant(), Bytes));
89 void MCAsmStreamer::SwitchSection(MCSection *Section) {
90 if (Section != CurSection) {
93 // FIXME: Really we would like the segment, flags, etc. to be separate
94 // values instead of embedded in the name. Not all assemblers understand all
96 OS << ".section " << Section->getName() << "\n";
100 void MCAsmStreamer::EmitLabel(MCSymbol *Symbol) {
101 assert(Symbol->getSection() == 0 && "Cannot emit a symbol twice!");
102 assert(CurSection && "Cannot emit before setting section!");
103 assert(!getContext().GetSymbolValue(Symbol) &&
104 "Cannot emit symbol which was directly assigned to!");
106 OS << Symbol->getName() << ":\n";
107 Symbol->setSection(CurSection);
110 void MCAsmStreamer::EmitAssignment(MCSymbol *Symbol, const MCValue &Value,
112 assert(!Symbol->getSection() && "Cannot assign to a label!");
115 OS << ".set " << Symbol->getName() << ", " << Value << '\n';
117 OS << Symbol->getName() << " = " << Value << '\n';
120 getContext().SetSymbolValue(Symbol, Value);
123 void MCAsmStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
124 SymbolAttr Attribute) {
126 case Global: OS << ".globl"; break;
127 case Hidden: OS << ".hidden"; break;
128 case IndirectSymbol: OS << ".indirect_symbol"; break;
129 case Internal: OS << ".internal"; break;
130 case LazyReference: OS << ".lazy_reference"; break;
131 case NoDeadStrip: OS << ".no_dead_strip"; break;
132 case PrivateExtern: OS << ".private_extern"; break;
133 case Protected: OS << ".protected"; break;
134 case Reference: OS << ".reference"; break;
135 case Weak: OS << ".weak"; break;
136 case WeakDefinition: OS << ".weak_definition"; break;
137 case WeakReference: OS << ".weak_reference"; break;
140 OS << ' ' << Symbol->getName() << '\n';
143 void MCAsmStreamer::EmitBytes(const char *Data, unsigned Length) {
144 assert(CurSection && "Cannot emit contents before setting section!");
145 for (unsigned i = 0; i != Length; ++i)
146 OS << ".byte " << (unsigned) Data[i] << '\n';
149 void MCAsmStreamer::EmitValue(const MCValue &Value, unsigned Size) {
150 assert(CurSection && "Cannot emit contents before setting section!");
151 // Need target hooks to know how to print this.
154 assert(0 && "Invalid size for machine code value!");
155 case 1: OS << ".byte"; break;
156 case 2: OS << ".short"; break;
157 case 4: OS << ".long"; break;
158 case 8: OS << ".quad"; break;
161 OS << ' ' << truncateToSize(Value, Size) << '\n';
164 void MCAsmStreamer::EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
166 unsigned MaxBytesToEmit) {
167 unsigned Pow2 = Log2_32(ByteAlignment);
168 assert((1U << Pow2) == ByteAlignment && "Invalid alignment!");
172 assert(0 && "Invalid size for machine code value!");
174 assert(0 && "Unsupported alignment size!");
175 case 1: OS << ".p2align"; break;
176 case 2: OS << ".p2alignw"; break;
177 case 4: OS << ".p2alignl"; break;
182 OS << ", " << truncateToSize(Value, ValueSize);
184 OS << ", " << MaxBytesToEmit;
188 void MCAsmStreamer::EmitValueToOffset(const MCValue &Offset,
189 unsigned char Value) {
190 // FIXME: Verify that Offset is associated with the current section.
191 OS << ".org " << Offset << ", " << (unsigned) Value << '\n';
194 void MCAsmStreamer::EmitInstruction(const MCInst &Inst) {
195 assert(CurSection && "Cannot emit contents before setting section!");
197 OS << "# FIXME: Implement instruction printing!\n";
200 void MCAsmStreamer::Finish() {
204 MCStreamer *llvm::createAsmStreamer(MCContext &Context, raw_ostream &OS) {
205 return new MCAsmStreamer(Context, OS);