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/MCContext.h"
11 #include "llvm/MC/MCStreamer.h"
12 #include "llvm/MC/MCExpr.h"
13 #include "llvm/MC/MCObjectWriter.h"
14 #include "llvm/Support/ErrorHandling.h"
15 #include "llvm/Support/raw_ostream.h"
16 #include "llvm/ADT/SmallString.h"
17 #include "llvm/ADT/Twine.h"
21 MCStreamer::MCStreamer(MCContext &Ctx) : Context(Ctx), CurSection(0),
25 MCStreamer::~MCStreamer() {
28 raw_ostream &MCStreamer::GetCommentOS() {
29 // By default, discard comments.
33 void MCStreamer::EmitDwarfSetLineAddr(int64_t LineDelta,
34 const MCSymbol *Label, int PointerSize) {
35 // emit the sequence to set the address
36 EmitIntValue(dwarf::DW_LNS_extended_op, 1);
37 EmitULEB128IntValue(PointerSize + 1);
38 EmitIntValue(dwarf::DW_LNE_set_address, 1);
39 EmitSymbolValue(Label, PointerSize);
41 // emit the sequence for the LineDelta (from 1) and a zero address delta.
42 MCDwarfLineAddr::Emit(this, LineDelta, 0);
45 /// EmitIntValue - Special case of EmitValue that avoids the client having to
46 /// pass in a MCExpr for constant integers.
47 void MCStreamer::EmitIntValue(uint64_t Value, unsigned Size,
49 EmitValue(MCConstantExpr::Create(Value, getContext()), Size, AddrSpace);
52 /// EmitULEB128Value - Special case of EmitULEB128Value that avoids the
53 /// client having to pass in a MCExpr for constant integers.
54 void MCStreamer::EmitULEB128IntValue(uint64_t Value, unsigned AddrSpace) {
56 raw_svector_ostream OSE(Tmp);
57 MCObjectWriter::EncodeULEB128(Value, OSE);
58 EmitBytes(OSE.str(), AddrSpace);
61 /// EmitSLEB128Value - Special case of EmitSLEB128Value that avoids the
62 /// client having to pass in a MCExpr for constant integers.
63 void MCStreamer::EmitSLEB128IntValue(int64_t Value, unsigned AddrSpace) {
65 raw_svector_ostream OSE(Tmp);
66 MCObjectWriter::EncodeSLEB128(Value, OSE);
67 EmitBytes(OSE.str(), AddrSpace);
70 void MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size,
72 EmitValue(MCSymbolRefExpr::Create(Sym, getContext()), Size, AddrSpace);
75 void MCStreamer::EmitGPRel32Value(const MCExpr *Value) {
76 report_fatal_error("unsupported directive in streamer");
79 /// EmitFill - Emit NumBytes bytes worth of the value specified by
80 /// FillValue. This implements directives such as '.space'.
81 void MCStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue,
83 const MCExpr *E = MCConstantExpr::Create(FillValue, getContext());
84 for (uint64_t i = 0, e = NumBytes; i != e; ++i)
85 EmitValue(E, 1, AddrSpace);
88 bool MCStreamer::EmitDwarfFileDirective(unsigned FileNo,
90 return getContext().GetDwarfFile(Filename, FileNo) == 0;
93 void MCStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
94 unsigned Column, unsigned Flags,
96 unsigned Discriminator) {
97 getContext().setCurrentDwarfLoc(FileNo, Line, Column, Flags, Isa,
101 bool MCStreamer::EmitCFIStartProc() {
105 bool MCStreamer::EmitCFIEndProc() {
109 bool MCStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
113 bool MCStreamer::EmitCFIDefCfaRegister(int64_t Register) {
117 bool MCStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) {
121 bool MCStreamer::EmitCFIPersonality(const MCSymbol *Sym) {
125 bool MCStreamer::EmitCFILsda(const MCSymbol *Sym) {
129 /// EmitRawText - If this file is backed by an assembly streamer, this dumps
130 /// the specified string in the output .s file. This capability is
131 /// indicated by the hasRawTextSupport() predicate.
132 void MCStreamer::EmitRawText(StringRef String) {
133 errs() << "EmitRawText called on an MCStreamer that doesn't support it, "
134 " something must not be fully mc'ized\n";
138 void MCStreamer::EmitRawText(const Twine &T) {
139 SmallString<128> Str;
141 EmitRawText(Str.str());