MCStreamer.cpp revision 3e03211625bba5bbb70a193c140ebf4dd8388bb7
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 58void MCStreamer::EmitGPRel32Value(const MCExpr *Value) { 59 report_fatal_error("unsupported directive in streamer"); 60} 61 62/// EmitFill - Emit NumBytes bytes worth of the value specified by 63/// FillValue. This implements directives such as '.space'. 64void MCStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue, 65 unsigned AddrSpace) { 66 const MCExpr *E = MCConstantExpr::Create(FillValue, getContext()); 67 for (uint64_t i = 0, e = NumBytes; i != e; ++i) 68 EmitValue(E, 1, AddrSpace); 69} 70 71bool MCStreamer::EmitDwarfFileDirective(unsigned FileNo, 72 StringRef Filename) { 73 return getContext().GetDwarfFile(Filename, FileNo) == 0; 74} 75 76void MCStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line, 77 unsigned Column, unsigned Flags, 78 unsigned Isa, 79 unsigned Discriminator) { 80 getContext().setCurrentDwarfLoc(FileNo, Line, Column, Flags, Isa, 81 Discriminator); 82} 83 84bool MCStreamer::EmitCFIStartProc() { 85 return false; 86} 87 88bool MCStreamer::EmitCFIEndProc() { 89 return false; 90} 91 92bool MCStreamer::EmitCFIDefCfaOffset(int64_t Offset) { 93 return false; 94} 95 96bool MCStreamer::EmitCFIDefCfaRegister(int64_t Register) { 97 return false; 98} 99 100bool MCStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) { 101 return false; 102} 103 104bool MCStreamer::EmitCFIPersonality(const MCSymbol *Sym) { 105 return false; 106} 107 108bool MCStreamer::EmitCFILsda(const MCSymbol *Sym) { 109 return false; 110} 111 112/// EmitRawText - If this file is backed by an assembly streamer, this dumps 113/// the specified string in the output .s file. This capability is 114/// indicated by the hasRawTextSupport() predicate. 115void MCStreamer::EmitRawText(StringRef String) { 116 errs() << "EmitRawText called on an MCStreamer that doesn't support it, " 117 " something must not be fully mc'ized\n"; 118 abort(); 119} 120 121void MCStreamer::EmitRawText(const Twine &T) { 122 SmallString<128> Str; 123 T.toVector(Str); 124 EmitRawText(Str.str()); 125} 126