MCStreamer.cpp revision 3f3bf9387b75f4c932e4c59bd7af719d26ae4b99
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/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" 19#include <cstdlib> 20using namespace llvm; 21 22MCStreamer::MCStreamer(MCContext &Ctx) : Context(Ctx) { 23 const MCSection *section = NULL; 24 SectionStack.push_back(std::make_pair(section, section)); 25} 26 27MCStreamer::~MCStreamer() { 28} 29 30raw_ostream &MCStreamer::GetCommentOS() { 31 // By default, discard comments. 32 return nulls(); 33} 34 35void MCStreamer::EmitDwarfSetLineAddr(int64_t LineDelta, 36 const MCSymbol *Label, int PointerSize) { 37 // emit the sequence to set the address 38 EmitIntValue(dwarf::DW_LNS_extended_op, 1); 39 EmitULEB128IntValue(PointerSize + 1); 40 EmitIntValue(dwarf::DW_LNE_set_address, 1); 41 EmitSymbolValue(Label, PointerSize); 42 43 // emit the sequence for the LineDelta (from 1) and a zero address delta. 44 MCDwarfLineAddr::Emit(this, LineDelta, 0); 45} 46 47/// EmitIntValue - Special case of EmitValue that avoids the client having to 48/// pass in a MCExpr for constant integers. 49void MCStreamer::EmitIntValue(uint64_t Value, unsigned Size, 50 unsigned AddrSpace) { 51 assert(Size <= 8 && "Invalid size"); 52 assert((isUIntN(8 * Size, Value) || isIntN(8 * Size, Value)) && 53 "Invalid size"); 54 char buf[8]; 55 // FIXME: Endianness assumption. 56 for (unsigned i = 0; i != Size; ++i) 57 buf[i] = uint8_t(Value >> (i * 8)); 58 EmitBytes(StringRef(buf, Size), AddrSpace); 59} 60 61/// EmitULEB128Value - Special case of EmitULEB128Value that avoids the 62/// client having to pass in a MCExpr for constant integers. 63void MCStreamer::EmitULEB128IntValue(uint64_t Value, unsigned AddrSpace) { 64 SmallString<32> Tmp; 65 raw_svector_ostream OSE(Tmp); 66 MCObjectWriter::EncodeULEB128(Value, OSE); 67 EmitBytes(OSE.str(), AddrSpace); 68} 69 70/// EmitSLEB128Value - Special case of EmitSLEB128Value that avoids the 71/// client having to pass in a MCExpr for constant integers. 72void MCStreamer::EmitSLEB128IntValue(int64_t Value, unsigned AddrSpace) { 73 SmallString<32> Tmp; 74 raw_svector_ostream OSE(Tmp); 75 MCObjectWriter::EncodeSLEB128(Value, OSE); 76 EmitBytes(OSE.str(), AddrSpace); 77} 78 79void MCStreamer::EmitAbsValue(const MCExpr *Value, unsigned Size, 80 unsigned AddrSpace) { 81 if (getContext().getAsmInfo().hasAggressiveSymbolFolding()) { 82 EmitValue(Value, Size, AddrSpace); 83 return; 84 } 85 MCSymbol *ABS = getContext().CreateTempSymbol(); 86 EmitAssignment(ABS, Value); 87 EmitSymbolValue(ABS, Size, AddrSpace); 88} 89 90 91void MCStreamer::EmitValue(const MCExpr *Value, unsigned Size, 92 unsigned AddrSpace) { 93 EmitValueImpl(Value, Size, false, AddrSpace); 94} 95 96void MCStreamer::EmitPCRelValue(const MCExpr *Value, unsigned Size, 97 unsigned AddrSpace) { 98 EmitValueImpl(Value, Size, true, AddrSpace); 99} 100 101void MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size, 102 bool isPCRel, unsigned AddrSpace) { 103 EmitValueImpl(MCSymbolRefExpr::Create(Sym, getContext()), Size, isPCRel, 104 AddrSpace); 105} 106 107void MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size, 108 unsigned AddrSpace) { 109 EmitSymbolValue(Sym, Size, false, AddrSpace); 110} 111 112void MCStreamer::EmitPCRelSymbolValue(const MCSymbol *Sym, unsigned Size, 113 unsigned AddrSpace) { 114 EmitSymbolValue(Sym, Size, true, AddrSpace); 115} 116 117void MCStreamer::EmitGPRel32Value(const MCExpr *Value) { 118 report_fatal_error("unsupported directive in streamer"); 119} 120 121/// EmitFill - Emit NumBytes bytes worth of the value specified by 122/// FillValue. This implements directives such as '.space'. 123void MCStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue, 124 unsigned AddrSpace) { 125 const MCExpr *E = MCConstantExpr::Create(FillValue, getContext()); 126 for (uint64_t i = 0, e = NumBytes; i != e; ++i) 127 EmitValue(E, 1, AddrSpace); 128} 129 130bool MCStreamer::EmitDwarfFileDirective(unsigned FileNo, 131 StringRef Filename) { 132 return getContext().GetDwarfFile(Filename, FileNo) == 0; 133} 134 135void MCStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line, 136 unsigned Column, unsigned Flags, 137 unsigned Isa, 138 unsigned Discriminator, 139 StringRef FileName) { 140 getContext().setCurrentDwarfLoc(FileNo, Line, Column, Flags, Isa, 141 Discriminator); 142} 143 144MCDwarfFrameInfo *MCStreamer::getCurrentFrameInfo() { 145 if (FrameInfos.empty()) 146 return NULL; 147 return &FrameInfos.back(); 148} 149 150void MCStreamer::EnsureValidFrame() { 151 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 152 if (!CurFrame || CurFrame->End) 153 report_fatal_error("No open frame"); 154} 155 156void MCStreamer::EmitCFIStartProc() { 157 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 158 if (CurFrame && !CurFrame->End) 159 report_fatal_error("Starting a frame before finishing the previous one!"); 160 MCDwarfFrameInfo Frame; 161 Frame.Begin = getContext().CreateTempSymbol(); 162 EmitLabel(Frame.Begin); 163 FrameInfos.push_back(Frame); 164} 165 166void MCStreamer::EmitCFIEndProc() { 167 EnsureValidFrame(); 168 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 169 CurFrame->End = getContext().CreateTempSymbol(); 170 EmitLabel(CurFrame->End); 171} 172 173void MCStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) { 174 EnsureValidFrame(); 175 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 176 MCSymbol *Label = getContext().CreateTempSymbol(); 177 EmitLabel(Label); 178 MachineLocation Dest(MachineLocation::VirtualFP); 179 MachineLocation Source(Register, -Offset); 180 MCCFIInstruction Instruction(Label, Dest, Source); 181 CurFrame->Instructions.push_back(Instruction); 182} 183 184void MCStreamer::EmitCFIDefCfaOffset(int64_t Offset) { 185 EnsureValidFrame(); 186 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 187 MCSymbol *Label = getContext().CreateTempSymbol(); 188 EmitLabel(Label); 189 MachineLocation Dest(MachineLocation::VirtualFP); 190 MachineLocation Source(MachineLocation::VirtualFP, -Offset); 191 MCCFIInstruction Instruction(Label, Dest, Source); 192 CurFrame->Instructions.push_back(Instruction); 193} 194 195void MCStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) { 196 EnsureValidFrame(); 197 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 198 MCSymbol *Label = getContext().CreateTempSymbol(); 199 EmitLabel(Label); 200 MachineLocation Dest(MachineLocation::VirtualFP); 201 MachineLocation Source(MachineLocation::VirtualFP, Adjustment); 202 MCCFIInstruction Instruction(MCCFIInstruction::RelMove, Label, Dest, Source); 203 CurFrame->Instructions.push_back(Instruction); 204} 205 206void MCStreamer::EmitCFIDefCfaRegister(int64_t Register) { 207 EnsureValidFrame(); 208 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 209 MCSymbol *Label = getContext().CreateTempSymbol(); 210 EmitLabel(Label); 211 MachineLocation Dest(Register); 212 MachineLocation Source(MachineLocation::VirtualFP); 213 MCCFIInstruction Instruction(Label, Dest, Source); 214 CurFrame->Instructions.push_back(Instruction); 215} 216 217void MCStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) { 218 EnsureValidFrame(); 219 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 220 MCSymbol *Label = getContext().CreateTempSymbol(); 221 EmitLabel(Label); 222 MachineLocation Dest(Register, Offset); 223 MachineLocation Source(Register, Offset); 224 MCCFIInstruction Instruction(Label, Dest, Source); 225 CurFrame->Instructions.push_back(Instruction); 226} 227 228void MCStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset) { 229 EnsureValidFrame(); 230 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 231 MCSymbol *Label = getContext().CreateTempSymbol(); 232 EmitLabel(Label); 233 MachineLocation Dest(Register, Offset); 234 MachineLocation Source(Register, Offset); 235 MCCFIInstruction Instruction(MCCFIInstruction::RelMove, Label, Dest, Source); 236 CurFrame->Instructions.push_back(Instruction); 237} 238 239void MCStreamer::EmitCFIPersonality(const MCSymbol *Sym, 240 unsigned Encoding) { 241 EnsureValidFrame(); 242 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 243 CurFrame->Personality = Sym; 244 CurFrame->PersonalityEncoding = Encoding; 245} 246 247void MCStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) { 248 EnsureValidFrame(); 249 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 250 CurFrame->Lsda = Sym; 251 CurFrame->LsdaEncoding = Encoding; 252} 253 254void MCStreamer::EmitCFIRememberState() { 255 EnsureValidFrame(); 256 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 257 MCSymbol *Label = getContext().CreateTempSymbol(); 258 EmitLabel(Label); 259 MCCFIInstruction Instruction(MCCFIInstruction::Remember, Label); 260 CurFrame->Instructions.push_back(Instruction); 261} 262 263void MCStreamer::EmitCFIRestoreState() { 264 // FIXME: Error if there is no matching cfi_remember_state. 265 EnsureValidFrame(); 266 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 267 MCSymbol *Label = getContext().CreateTempSymbol(); 268 EmitLabel(Label); 269 MCCFIInstruction Instruction(MCCFIInstruction::Restore, Label); 270 CurFrame->Instructions.push_back(Instruction); 271} 272 273void MCStreamer::EmitCFISameValue(int64_t Register) { 274 EnsureValidFrame(); 275 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 276 MCSymbol *Label = getContext().CreateTempSymbol(); 277 EmitLabel(Label); 278 MCCFIInstruction Instruction(MCCFIInstruction::SameValue, Label, Register); 279 CurFrame->Instructions.push_back(Instruction); 280} 281 282void MCStreamer::EmitFnStart() { 283 errs() << "Not implemented yet\n"; 284 abort(); 285} 286 287void MCStreamer::EmitFnEnd() { 288 errs() << "Not implemented yet\n"; 289 abort(); 290} 291 292void MCStreamer::EmitCantUnwind() { 293 errs() << "Not implemented yet\n"; 294 abort(); 295} 296 297void MCStreamer::EmitHandlerData() { 298 errs() << "Not implemented yet\n"; 299 abort(); 300} 301 302void MCStreamer::EmitPersonality(const MCSymbol *Personality) { 303 errs() << "Not implemented yet\n"; 304 abort(); 305} 306 307void MCStreamer::EmitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset) { 308 errs() << "Not implemented yet\n"; 309 abort(); 310} 311 312void MCStreamer::EmitPad(int64_t Offset) { 313 errs() << "Not implemented yet\n"; 314 abort(); 315} 316 317void MCStreamer::EmitRegSave(const SmallVectorImpl<unsigned> &RegList, bool) { 318 errs() << "Not implemented yet\n"; 319 abort(); 320} 321 322/// EmitRawText - If this file is backed by an assembly streamer, this dumps 323/// the specified string in the output .s file. This capability is 324/// indicated by the hasRawTextSupport() predicate. 325void MCStreamer::EmitRawText(StringRef String) { 326 errs() << "EmitRawText called on an MCStreamer that doesn't support it, " 327 " something must not be fully mc'ized\n"; 328 abort(); 329} 330 331void MCStreamer::EmitRawText(const Twine &T) { 332 SmallString<128> Str; 333 T.toVector(Str); 334 EmitRawText(Str.str()); 335} 336