1 //===- lib/MC/MCStreamer.cpp - Streaming Machine Code 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/MCAsmInfo.h"
11 #include "llvm/MC/MCContext.h"
12 #include "llvm/MC/MCStreamer.h"
13 #include "llvm/MC/MCExpr.h"
14 #include "llvm/MC/MCObjectWriter.h"
15 #include "llvm/Support/ErrorHandling.h"
16 #include "llvm/Support/raw_ostream.h"
17 #include "llvm/ADT/SmallString.h"
18 #include "llvm/ADT/Twine.h"
22 MCStreamer::MCStreamer(MCContext &Ctx) : Context(Ctx), CurSection(0),
26 MCStreamer::~MCStreamer() {
29 raw_ostream &MCStreamer::GetCommentOS() {
30 // By default, discard comments.
34 void MCStreamer::EmitDwarfSetLineAddr(int64_t LineDelta,
35 const MCSymbol *Label, int PointerSize) {
36 // emit the sequence to set the address
37 EmitIntValue(dwarf::DW_LNS_extended_op, 1);
38 EmitULEB128IntValue(PointerSize + 1);
39 EmitIntValue(dwarf::DW_LNE_set_address, 1);
40 EmitSymbolValue(Label, PointerSize);
42 // emit the sequence for the LineDelta (from 1) and a zero address delta.
43 MCDwarfLineAddr::Emit(this, LineDelta, 0);
46 /// EmitIntValue - Special case of EmitValue that avoids the client having to
47 /// pass in a MCExpr for constant integers.
48 void MCStreamer::EmitIntValue(uint64_t Value, unsigned Size,
52 // FIXME: Endianness assumption.
53 for (unsigned i = 0; i != Size; ++i)
54 buf[i] = uint8_t(Value >> (i * 8));
55 EmitBytes(StringRef(buf, Size), AddrSpace);
58 /// EmitULEB128Value - Special case of EmitULEB128Value that avoids the
59 /// client having to pass in a MCExpr for constant integers.
60 void MCStreamer::EmitULEB128IntValue(uint64_t Value, unsigned AddrSpace) {
62 raw_svector_ostream OSE(Tmp);
63 MCObjectWriter::EncodeULEB128(Value, OSE);
64 EmitBytes(OSE.str(), AddrSpace);
67 /// EmitSLEB128Value - Special case of EmitSLEB128Value that avoids the
68 /// client having to pass in a MCExpr for constant integers.
69 void MCStreamer::EmitSLEB128IntValue(int64_t Value, unsigned AddrSpace) {
71 raw_svector_ostream OSE(Tmp);
72 MCObjectWriter::EncodeSLEB128(Value, OSE);
73 EmitBytes(OSE.str(), AddrSpace);
76 void MCStreamer::EmitAbsValue(const MCExpr *Value, unsigned Size,
78 if (!getContext().getAsmInfo().needsSetToChangeDiffSize()) {
79 EmitValue(Value, Size, AddrSpace);
82 MCSymbol *ABS = getContext().CreateTempSymbol();
83 EmitAssignment(ABS, Value);
84 EmitSymbolValue(ABS, Size, AddrSpace);
87 void MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size,
89 EmitValue(MCSymbolRefExpr::Create(Sym, getContext()), Size, AddrSpace);
92 void MCStreamer::EmitGPRel32Value(const MCExpr *Value) {
93 report_fatal_error("unsupported directive in streamer");
96 /// EmitFill - Emit NumBytes bytes worth of the value specified by
97 /// FillValue. This implements directives such as '.space'.
98 void MCStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue,
100 const MCExpr *E = MCConstantExpr::Create(FillValue, getContext());
101 for (uint64_t i = 0, e = NumBytes; i != e; ++i)
102 EmitValue(E, 1, AddrSpace);
105 bool MCStreamer::EmitDwarfFileDirective(unsigned FileNo,
106 StringRef Filename) {
107 return getContext().GetDwarfFile(Filename, FileNo) == 0;
110 void MCStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
111 unsigned Column, unsigned Flags,
113 unsigned Discriminator) {
114 getContext().setCurrentDwarfLoc(FileNo, Line, Column, Flags, Isa,
118 bool MCStreamer::EmitCFIStartProc() {
122 bool MCStreamer::EmitCFIEndProc() {
126 bool MCStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
130 bool MCStreamer::EmitCFIDefCfaRegister(int64_t Register) {
134 bool MCStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) {
138 bool MCStreamer::EmitCFIPersonality(const MCSymbol *Sym) {
142 bool MCStreamer::EmitCFILsda(const MCSymbol *Sym) {
146 /// EmitRawText - If this file is backed by an assembly streamer, this dumps
147 /// the specified string in the output .s file. This capability is
148 /// indicated by the hasRawTextSupport() predicate.
149 void MCStreamer::EmitRawText(StringRef String) {
150 errs() << "EmitRawText called on an MCStreamer that doesn't support it, "
151 " something must not be fully mc'ized\n";
155 void MCStreamer::EmitRawText(const Twine &T) {
156 SmallString<128> Str;
158 EmitRawText(Str.str());