MCStreamer.cpp revision 91d9a1c0f7c598d51c50f80bc9e8dfc1494f78c1
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/MC/MCSymbol.h" 16#include "llvm/Support/ErrorHandling.h" 17#include "llvm/Support/raw_ostream.h" 18#include "llvm/ADT/SmallString.h" 19#include "llvm/ADT/Twine.h" 20#include <cstdlib> 21using namespace llvm; 22 23MCStreamer::MCStreamer(MCContext &Ctx) : Context(Ctx), EmitEHFrame(true), 24 EmitDebugFrame(false) { 25 const MCSection *section = NULL; 26 SectionStack.push_back(std::make_pair(section, section)); 27} 28 29MCStreamer::~MCStreamer() { 30} 31 32const MCExpr *MCStreamer::BuildSymbolDiff(MCContext &Context, 33 const MCSymbol *A, 34 const MCSymbol *B) { 35 MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None; 36 const MCExpr *ARef = 37 MCSymbolRefExpr::Create(A, Variant, Context); 38 const MCExpr *BRef = 39 MCSymbolRefExpr::Create(B, Variant, Context); 40 const MCExpr *AddrDelta = 41 MCBinaryExpr::Create(MCBinaryExpr::Sub, ARef, BRef, Context); 42 return AddrDelta; 43} 44 45const MCExpr *MCStreamer::ForceExpAbs(MCStreamer *Streamer, 46 MCContext &Context, const MCExpr* Expr) { 47 if (Context.getAsmInfo().hasAggressiveSymbolFolding()) 48 return Expr; 49 50 MCSymbol *ABS = Context.CreateTempSymbol(); 51 Streamer->EmitAssignment(ABS, Expr); 52 return MCSymbolRefExpr::Create(ABS, Context); 53} 54 55raw_ostream &MCStreamer::GetCommentOS() { 56 // By default, discard comments. 57 return nulls(); 58} 59 60void MCStreamer::EmitDwarfSetLineAddr(int64_t LineDelta, 61 const MCSymbol *Label, int PointerSize) { 62 // emit the sequence to set the address 63 EmitIntValue(dwarf::DW_LNS_extended_op, 1); 64 EmitULEB128IntValue(PointerSize + 1); 65 EmitIntValue(dwarf::DW_LNE_set_address, 1); 66 EmitSymbolValue(Label, PointerSize); 67 68 // emit the sequence for the LineDelta (from 1) and a zero address delta. 69 MCDwarfLineAddr::Emit(this, LineDelta, 0); 70} 71 72/// EmitIntValue - Special case of EmitValue that avoids the client having to 73/// pass in a MCExpr for constant integers. 74void MCStreamer::EmitIntValue(uint64_t Value, unsigned Size, 75 unsigned AddrSpace) { 76 assert(Size <= 8 && "Invalid size"); 77 assert((isUIntN(8 * Size, Value) || isIntN(8 * Size, Value)) && 78 "Invalid size"); 79 char buf[8]; 80 // FIXME: Endianness assumption. 81 for (unsigned i = 0; i != Size; ++i) 82 buf[i] = uint8_t(Value >> (i * 8)); 83 EmitBytes(StringRef(buf, Size), AddrSpace); 84} 85 86/// EmitULEB128Value - Special case of EmitULEB128Value that avoids the 87/// client having to pass in a MCExpr for constant integers. 88void MCStreamer::EmitULEB128IntValue(uint64_t Value, unsigned AddrSpace) { 89 SmallString<32> Tmp; 90 raw_svector_ostream OSE(Tmp); 91 MCObjectWriter::EncodeULEB128(Value, OSE); 92 EmitBytes(OSE.str(), AddrSpace); 93} 94 95/// EmitSLEB128Value - Special case of EmitSLEB128Value that avoids the 96/// client having to pass in a MCExpr for constant integers. 97void MCStreamer::EmitSLEB128IntValue(int64_t Value, unsigned AddrSpace) { 98 SmallString<32> Tmp; 99 raw_svector_ostream OSE(Tmp); 100 MCObjectWriter::EncodeSLEB128(Value, OSE); 101 EmitBytes(OSE.str(), AddrSpace); 102} 103 104void MCStreamer::EmitAbsValue(const MCExpr *Value, unsigned Size, 105 unsigned AddrSpace) { 106 if (getContext().getAsmInfo().hasAggressiveSymbolFolding()) { 107 EmitValue(Value, Size, AddrSpace); 108 return; 109 } 110 MCSymbol *ABS = getContext().CreateTempSymbol(); 111 EmitAssignment(ABS, Value); 112 EmitSymbolValue(ABS, Size, AddrSpace); 113} 114 115 116void MCStreamer::EmitValue(const MCExpr *Value, unsigned Size, 117 unsigned AddrSpace) { 118 EmitValueImpl(Value, Size, AddrSpace); 119} 120 121void MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size, 122 unsigned AddrSpace) { 123 EmitValueImpl(MCSymbolRefExpr::Create(Sym, getContext()), Size, 124 AddrSpace); 125} 126 127void MCStreamer::EmitGPRel32Value(const MCExpr *Value) { 128 report_fatal_error("unsupported directive in streamer"); 129} 130 131/// EmitFill - Emit NumBytes bytes worth of the value specified by 132/// FillValue. This implements directives such as '.space'. 133void MCStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue, 134 unsigned AddrSpace) { 135 const MCExpr *E = MCConstantExpr::Create(FillValue, getContext()); 136 for (uint64_t i = 0, e = NumBytes; i != e; ++i) 137 EmitValue(E, 1, AddrSpace); 138} 139 140bool MCStreamer::EmitDwarfFileDirective(unsigned FileNo, 141 StringRef Filename) { 142 return getContext().GetDwarfFile(Filename, FileNo) == 0; 143} 144 145void MCStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line, 146 unsigned Column, unsigned Flags, 147 unsigned Isa, 148 unsigned Discriminator, 149 StringRef FileName) { 150 getContext().setCurrentDwarfLoc(FileNo, Line, Column, Flags, Isa, 151 Discriminator); 152} 153 154MCDwarfFrameInfo *MCStreamer::getCurrentFrameInfo() { 155 if (FrameInfos.empty()) 156 return NULL; 157 return &FrameInfos.back(); 158} 159 160void MCStreamer::EnsureValidFrame() { 161 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 162 if (!CurFrame || CurFrame->End) 163 report_fatal_error("No open frame"); 164} 165 166void MCStreamer::EmitEHSymAttributes(const MCSymbol *Symbol, 167 MCSymbol *EHSymbol) { 168} 169 170void MCStreamer::EmitLabel(MCSymbol *Symbol) { 171 assert(!Symbol->isVariable() && "Cannot emit a variable symbol!"); 172 assert(getCurrentSection() && "Cannot emit before setting section!"); 173 Symbol->setSection(*getCurrentSection()); 174 175 StringRef Prefix = getContext().getAsmInfo().getPrivateGlobalPrefix(); 176 if (!Symbol->getName().startswith(Prefix)) 177 LastNonPrivate = Symbol; 178} 179 180void MCStreamer::EmitCFISections(bool EH, bool Debug) { 181 assert(EH || Debug); 182 EmitEHFrame = EH; 183 EmitDebugFrame = Debug; 184} 185 186void MCStreamer::EmitCFIStartProc() { 187 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 188 if (CurFrame && !CurFrame->End) 189 report_fatal_error("Starting a frame before finishing the previous one!"); 190 MCDwarfFrameInfo Frame; 191 Frame.Begin = getContext().CreateTempSymbol(); 192 Frame.Function = LastNonPrivate; 193 EmitLabel(Frame.Begin); 194 FrameInfos.push_back(Frame); 195} 196 197void MCStreamer::EmitCFIEndProc() { 198 EnsureValidFrame(); 199 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 200 CurFrame->End = getContext().CreateTempSymbol(); 201 EmitLabel(CurFrame->End); 202} 203 204void MCStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) { 205 EnsureValidFrame(); 206 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 207 MCSymbol *Label = getContext().CreateTempSymbol(); 208 EmitLabel(Label); 209 MachineLocation Dest(MachineLocation::VirtualFP); 210 MachineLocation Source(Register, -Offset); 211 MCCFIInstruction Instruction(Label, Dest, Source); 212 CurFrame->Instructions.push_back(Instruction); 213} 214 215void MCStreamer::EmitCFIDefCfaOffset(int64_t Offset) { 216 EnsureValidFrame(); 217 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 218 MCSymbol *Label = getContext().CreateTempSymbol(); 219 EmitLabel(Label); 220 MachineLocation Dest(MachineLocation::VirtualFP); 221 MachineLocation Source(MachineLocation::VirtualFP, -Offset); 222 MCCFIInstruction Instruction(Label, Dest, Source); 223 CurFrame->Instructions.push_back(Instruction); 224} 225 226void MCStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) { 227 EnsureValidFrame(); 228 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 229 MCSymbol *Label = getContext().CreateTempSymbol(); 230 EmitLabel(Label); 231 MachineLocation Dest(MachineLocation::VirtualFP); 232 MachineLocation Source(MachineLocation::VirtualFP, Adjustment); 233 MCCFIInstruction Instruction(MCCFIInstruction::RelMove, Label, Dest, Source); 234 CurFrame->Instructions.push_back(Instruction); 235} 236 237void MCStreamer::EmitCFIDefCfaRegister(int64_t Register) { 238 EnsureValidFrame(); 239 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 240 MCSymbol *Label = getContext().CreateTempSymbol(); 241 EmitLabel(Label); 242 MachineLocation Dest(Register); 243 MachineLocation Source(MachineLocation::VirtualFP); 244 MCCFIInstruction Instruction(Label, Dest, Source); 245 CurFrame->Instructions.push_back(Instruction); 246} 247 248void MCStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) { 249 EnsureValidFrame(); 250 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 251 MCSymbol *Label = getContext().CreateTempSymbol(); 252 EmitLabel(Label); 253 MachineLocation Dest(Register, Offset); 254 MachineLocation Source(Register, Offset); 255 MCCFIInstruction Instruction(Label, Dest, Source); 256 CurFrame->Instructions.push_back(Instruction); 257} 258 259void MCStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset) { 260 EnsureValidFrame(); 261 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 262 MCSymbol *Label = getContext().CreateTempSymbol(); 263 EmitLabel(Label); 264 MachineLocation Dest(Register, Offset); 265 MachineLocation Source(Register, Offset); 266 MCCFIInstruction Instruction(MCCFIInstruction::RelMove, Label, Dest, Source); 267 CurFrame->Instructions.push_back(Instruction); 268} 269 270void MCStreamer::EmitCFIPersonality(const MCSymbol *Sym, 271 unsigned Encoding) { 272 EnsureValidFrame(); 273 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 274 CurFrame->Personality = Sym; 275 CurFrame->PersonalityEncoding = Encoding; 276} 277 278void MCStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) { 279 EnsureValidFrame(); 280 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 281 CurFrame->Lsda = Sym; 282 CurFrame->LsdaEncoding = Encoding; 283} 284 285void MCStreamer::EmitCFIRememberState() { 286 EnsureValidFrame(); 287 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 288 MCSymbol *Label = getContext().CreateTempSymbol(); 289 EmitLabel(Label); 290 MCCFIInstruction Instruction(MCCFIInstruction::Remember, Label); 291 CurFrame->Instructions.push_back(Instruction); 292} 293 294void MCStreamer::EmitCFIRestoreState() { 295 // FIXME: Error if there is no matching cfi_remember_state. 296 EnsureValidFrame(); 297 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 298 MCSymbol *Label = getContext().CreateTempSymbol(); 299 EmitLabel(Label); 300 MCCFIInstruction Instruction(MCCFIInstruction::Restore, Label); 301 CurFrame->Instructions.push_back(Instruction); 302} 303 304void MCStreamer::EmitCFISameValue(int64_t Register) { 305 EnsureValidFrame(); 306 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 307 MCSymbol *Label = getContext().CreateTempSymbol(); 308 EmitLabel(Label); 309 MCCFIInstruction Instruction(MCCFIInstruction::SameValue, Label, Register); 310 CurFrame->Instructions.push_back(Instruction); 311} 312 313void MCStreamer::setCurrentW64UnwindInfo(MCWin64EHUnwindInfo *Frame) { 314 W64UnwindInfos.push_back(*Frame); 315 CurrentW64UnwindInfo = &W64UnwindInfos.back(); 316} 317 318void MCStreamer::EnsureValidW64UnwindInfo() { 319 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo; 320 if (!CurFrame || CurFrame->End) 321 report_fatal_error("No open Win64 EH frame function!"); 322} 323 324void MCStreamer::EmitWin64EHStartProc(MCSymbol *Symbol, MCSymbol *EHandler) { 325 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo; 326 if (CurFrame && !CurFrame->End) 327 report_fatal_error("Starting a function before ending the previous one!"); 328 MCWin64EHUnwindInfo Frame; 329 Frame.Begin = getContext().CreateTempSymbol(); 330 Frame.Function = Symbol; 331 Frame.ExceptionHandler = EHandler; 332 EmitLabel(Frame.Begin); 333 setCurrentW64UnwindInfo(&Frame); 334} 335 336void MCStreamer::EmitWin64EHEndProc() { 337 EnsureValidW64UnwindInfo(); 338 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo; 339 if (CurFrame->ChainedParent) 340 report_fatal_error("Not all chained regions terminated!"); 341 CurFrame->End = getContext().CreateTempSymbol(); 342 EmitLabel(CurFrame->End); 343} 344 345void MCStreamer::EmitWin64EHStartChained() 346{ 347 EnsureValidW64UnwindInfo(); 348 MCWin64EHUnwindInfo Frame; 349 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo; 350 Frame.Begin = getContext().CreateTempSymbol(); 351 Frame.Function = CurFrame->Function; 352 Frame.ChainedParent = CurFrame; 353 EmitLabel(Frame.Begin); 354 setCurrentW64UnwindInfo(&Frame); 355} 356 357void MCStreamer::EmitWin64EHEndChained() 358{ 359 EnsureValidW64UnwindInfo(); 360 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo; 361 if (!CurFrame->ChainedParent) 362 report_fatal_error("End of a chained region outside a chained region!"); 363 CurFrame->End = getContext().CreateTempSymbol(); 364 EmitLabel(CurFrame->End); 365 CurrentW64UnwindInfo = CurFrame->ChainedParent; 366} 367 368void MCStreamer::EmitWin64EHUnwindOnly() 369{ 370 errs() << "Not implemented yet\n"; 371 abort(); 372} 373 374void MCStreamer::EmitWin64EHLsda(const MCSymbol *Sym, int64_t Size) 375{ 376 errs() << "Not implemented yet\n"; 377 abort(); 378} 379 380void MCStreamer::EmitWin64EHPushReg(int64_t Register) 381{ 382 errs() << "Not implemented yet\n"; 383 abort(); 384} 385 386void MCStreamer::EmitWin64EHSetFrame(int64_t Register, int64_t Offset) 387{ 388 errs() << "Not implemented yet\n"; 389 abort(); 390} 391 392void MCStreamer::EmitWin64EHAllocStack(int64_t Size) 393{ 394 errs() << "Not implemented yet\n"; 395 abort(); 396} 397 398void MCStreamer::EmitWin64EHSaveReg(int64_t Register, int64_t Offset) 399{ 400 errs() << "Not implemented yet\n"; 401 abort(); 402} 403 404void MCStreamer::EmitWin64EHPushFrame(bool Code) 405{ 406 errs() << "Not implemented yet\n"; 407 abort(); 408} 409 410void MCStreamer::EmitWin64EHEndProlog() 411{ 412 errs() << "Not implemented yet\n"; 413 abort(); 414} 415 416void MCStreamer::EmitFnStart() { 417 errs() << "Not implemented yet\n"; 418 abort(); 419} 420 421void MCStreamer::EmitFnEnd() { 422 errs() << "Not implemented yet\n"; 423 abort(); 424} 425 426void MCStreamer::EmitCantUnwind() { 427 errs() << "Not implemented yet\n"; 428 abort(); 429} 430 431void MCStreamer::EmitHandlerData() { 432 errs() << "Not implemented yet\n"; 433 abort(); 434} 435 436void MCStreamer::EmitPersonality(const MCSymbol *Personality) { 437 errs() << "Not implemented yet\n"; 438 abort(); 439} 440 441void MCStreamer::EmitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset) { 442 errs() << "Not implemented yet\n"; 443 abort(); 444} 445 446void MCStreamer::EmitPad(int64_t Offset) { 447 errs() << "Not implemented yet\n"; 448 abort(); 449} 450 451void MCStreamer::EmitRegSave(const SmallVectorImpl<unsigned> &RegList, bool) { 452 errs() << "Not implemented yet\n"; 453 abort(); 454} 455 456/// EmitRawText - If this file is backed by an assembly streamer, this dumps 457/// the specified string in the output .s file. This capability is 458/// indicated by the hasRawTextSupport() predicate. 459void MCStreamer::EmitRawText(StringRef String) { 460 errs() << "EmitRawText called on an MCStreamer that doesn't support it, " 461 " something must not be fully mc'ized\n"; 462 abort(); 463} 464 465void MCStreamer::EmitRawText(const Twine &T) { 466 SmallString<128> Str; 467 T.toVector(Str); 468 EmitRawText(Str.str()); 469} 470 471void MCStreamer::EmitFrames(bool usingCFI) { 472 if (!getNumFrameInfos()) 473 return; 474 475 if (EmitEHFrame) 476 MCDwarfFrameEmitter::Emit(*this, usingCFI, true); 477 478 if (EmitDebugFrame) 479 MCDwarfFrameEmitter::Emit(*this, usingCFI, false); 480} 481