MCStreamer.cpp revision cdfecc8759941c2996214070478d30084b79d463
1//===- lib/MC/MCStreamer.cpp - Streaming Machine Code Output --------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9 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" 18#include <cstdlib> 19using namespace llvm; 20 21MCStreamer::MCStreamer(MCContext &Ctx) : Context(Ctx), CurSection(0), 22 PrevSection(0) { 23} 24 25MCStreamer::~MCStreamer() { 26} 27 28raw_ostream &MCStreamer::GetCommentOS() { 29 // By default, discard comments. 30 return nulls(); 31} 32 33 34/// EmitIntValue - Special case of EmitValue that avoids the client having to 35/// pass in a MCExpr for constant integers. 36void MCStreamer::EmitIntValue(uint64_t Value, unsigned Size, 37 unsigned AddrSpace) { 38 EmitValue(MCConstantExpr::Create(Value, getContext()), Size, AddrSpace); 39} 40 41/// EmitULEB128Value - Special case of EmitULEB128Value that avoids the 42/// client having to pass in a MCExpr for constant integers. 43void MCStreamer::EmitULEB128IntValue(uint64_t Value, unsigned AddrSpace) { 44 EmitULEB128Value(MCConstantExpr::Create(Value, getContext()), AddrSpace); 45} 46 47/// EmitSLEB128Value - Special case of EmitSLEB128Value that avoids the 48/// client having to pass in a MCExpr for constant integers. 49void MCStreamer::EmitSLEB128IntValue(int64_t Value, unsigned AddrSpace) { 50 EmitSLEB128Value(MCConstantExpr::Create(Value, getContext()), AddrSpace); 51} 52 53void MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size, 54 unsigned AddrSpace) { 55 EmitValue(MCSymbolRefExpr::Create(Sym, getContext()), Size, AddrSpace); 56} 57 58/// EmitFill - Emit NumBytes bytes worth of the value specified by 59/// FillValue. This implements directives such as '.space'. 60void MCStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue, 61 unsigned AddrSpace) { 62 const MCExpr *E = MCConstantExpr::Create(FillValue, getContext()); 63 for (uint64_t i = 0, e = NumBytes; i != e; ++i) 64 EmitValue(E, 1, AddrSpace); 65} 66 67bool MCStreamer::EmitDwarfFileDirective(unsigned FileNo, 68 StringRef Filename) { 69 return getContext().GetDwarfFile(Filename, FileNo) == 0; 70} 71 72void MCStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line, 73 unsigned Column, unsigned Flags, 74 unsigned Isa, 75 unsigned Discriminator) { 76 getContext().setCurrentDwarfLoc(FileNo, Line, Column, Flags, Isa, 77 Discriminator); 78} 79 80bool MCStreamer::EmitCFIStartProc() { 81 return false; 82} 83 84bool MCStreamer::EmitCFIEndProc() { 85 return false; 86} 87 88bool MCStreamer::EmitCFIDefCfaOffset(int64_t Offset) { 89 return false; 90} 91 92bool MCStreamer::EmitCFIDefCfaRegister(int64_t Register) { 93 return false; 94} 95 96bool MCStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) { 97 return false; 98} 99 100bool MCStreamer::EmitCFIPersonality(const MCSymbol *Sym) { 101 return false; 102} 103 104bool MCStreamer::EmitCFILsda(const MCSymbol *Sym) { 105 return false; 106} 107 108/// EmitRawText - If this file is backed by an assembly streamer, this dumps 109/// the specified string in the output .s file. This capability is 110/// indicated by the hasRawTextSupport() predicate. 111void MCStreamer::EmitRawText(StringRef String) { 112 errs() << "EmitRawText called on an MCStreamer that doesn't support it, " 113 " something must not be fully mc'ized\n"; 114 abort(); 115} 116 117void MCStreamer::EmitRawText(const Twine &T) { 118 SmallString<128> Str; 119 T.toVector(Str); 120 EmitRawText(Str.str()); 121} 122