MCStreamer.cpp revision d0b76d00048352affac4fad0ef005e28f5340b76
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(const MCExpr* Expr) { 46 if (Context.getAsmInfo().hasAggressiveSymbolFolding() || 47 isa<MCSymbolRefExpr>(Expr)) 48 return Expr; 49 50 MCSymbol *ABS = Context.CreateTempSymbol(); 51 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 const MCExpr *ABS = ForceExpAbs(Value); 107 EmitValue(ABS, Size, AddrSpace); 108} 109 110 111void MCStreamer::EmitValue(const MCExpr *Value, unsigned Size, 112 unsigned AddrSpace) { 113 EmitValueImpl(Value, Size, AddrSpace); 114} 115 116void MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size, 117 unsigned AddrSpace) { 118 EmitValueImpl(MCSymbolRefExpr::Create(Sym, getContext()), Size, 119 AddrSpace); 120} 121 122void MCStreamer::EmitGPRel32Value(const MCExpr *Value) { 123 report_fatal_error("unsupported directive in streamer"); 124} 125 126/// EmitFill - Emit NumBytes bytes worth of the value specified by 127/// FillValue. This implements directives such as '.space'. 128void MCStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue, 129 unsigned AddrSpace) { 130 const MCExpr *E = MCConstantExpr::Create(FillValue, getContext()); 131 for (uint64_t i = 0, e = NumBytes; i != e; ++i) 132 EmitValue(E, 1, AddrSpace); 133} 134 135bool MCStreamer::EmitDwarfFileDirective(unsigned FileNo, 136 StringRef Filename) { 137 return getContext().GetDwarfFile(Filename, FileNo) == 0; 138} 139 140void MCStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line, 141 unsigned Column, unsigned Flags, 142 unsigned Isa, 143 unsigned Discriminator, 144 StringRef FileName) { 145 getContext().setCurrentDwarfLoc(FileNo, Line, Column, Flags, Isa, 146 Discriminator); 147} 148 149MCDwarfFrameInfo *MCStreamer::getCurrentFrameInfo() { 150 if (FrameInfos.empty()) 151 return NULL; 152 return &FrameInfos.back(); 153} 154 155void MCStreamer::EnsureValidFrame() { 156 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 157 if (!CurFrame || CurFrame->End) 158 report_fatal_error("No open frame"); 159} 160 161void MCStreamer::EmitEHSymAttributes(const MCSymbol *Symbol, 162 MCSymbol *EHSymbol) { 163} 164 165void MCStreamer::EmitLabel(MCSymbol *Symbol) { 166 assert(!Symbol->isVariable() && "Cannot emit a variable symbol!"); 167 assert(getCurrentSection() && "Cannot emit before setting section!"); 168 Symbol->setSection(*getCurrentSection()); 169 170 StringRef Prefix = getContext().getAsmInfo().getPrivateGlobalPrefix(); 171 if (!Symbol->getName().startswith(Prefix)) 172 LastNonPrivate = Symbol; 173} 174 175void MCStreamer::EmitCFISections(bool EH, bool Debug) { 176 assert(EH || Debug); 177 EmitEHFrame = EH; 178 EmitDebugFrame = Debug; 179} 180 181void MCStreamer::EmitCFIStartProc() { 182 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 183 if (CurFrame && !CurFrame->End) 184 report_fatal_error("Starting a frame before finishing the previous one!"); 185 MCDwarfFrameInfo Frame; 186 Frame.Begin = getContext().CreateTempSymbol(); 187 Frame.Function = LastNonPrivate; 188 EmitLabel(Frame.Begin); 189 FrameInfos.push_back(Frame); 190} 191 192void MCStreamer::EmitCFIEndProc() { 193 EnsureValidFrame(); 194 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 195 CurFrame->End = getContext().CreateTempSymbol(); 196 EmitLabel(CurFrame->End); 197} 198 199void MCStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) { 200 EnsureValidFrame(); 201 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 202 MCSymbol *Label = getContext().CreateTempSymbol(); 203 EmitLabel(Label); 204 MachineLocation Dest(MachineLocation::VirtualFP); 205 MachineLocation Source(Register, -Offset); 206 MCCFIInstruction Instruction(Label, Dest, Source); 207 CurFrame->Instructions.push_back(Instruction); 208} 209 210void MCStreamer::EmitCFIDefCfaOffset(int64_t Offset) { 211 EnsureValidFrame(); 212 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 213 MCSymbol *Label = getContext().CreateTempSymbol(); 214 EmitLabel(Label); 215 MachineLocation Dest(MachineLocation::VirtualFP); 216 MachineLocation Source(MachineLocation::VirtualFP, -Offset); 217 MCCFIInstruction Instruction(Label, Dest, Source); 218 CurFrame->Instructions.push_back(Instruction); 219} 220 221void MCStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) { 222 EnsureValidFrame(); 223 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 224 MCSymbol *Label = getContext().CreateTempSymbol(); 225 EmitLabel(Label); 226 MachineLocation Dest(MachineLocation::VirtualFP); 227 MachineLocation Source(MachineLocation::VirtualFP, Adjustment); 228 MCCFIInstruction Instruction(MCCFIInstruction::RelMove, Label, Dest, Source); 229 CurFrame->Instructions.push_back(Instruction); 230} 231 232void MCStreamer::EmitCFIDefCfaRegister(int64_t Register) { 233 EnsureValidFrame(); 234 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 235 MCSymbol *Label = getContext().CreateTempSymbol(); 236 EmitLabel(Label); 237 MachineLocation Dest(Register); 238 MachineLocation Source(MachineLocation::VirtualFP); 239 MCCFIInstruction Instruction(Label, Dest, Source); 240 CurFrame->Instructions.push_back(Instruction); 241} 242 243void MCStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) { 244 EnsureValidFrame(); 245 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 246 MCSymbol *Label = getContext().CreateTempSymbol(); 247 EmitLabel(Label); 248 MachineLocation Dest(Register, Offset); 249 MachineLocation Source(Register, Offset); 250 MCCFIInstruction Instruction(Label, Dest, Source); 251 CurFrame->Instructions.push_back(Instruction); 252} 253 254void MCStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset) { 255 EnsureValidFrame(); 256 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 257 MCSymbol *Label = getContext().CreateTempSymbol(); 258 EmitLabel(Label); 259 MachineLocation Dest(Register, Offset); 260 MachineLocation Source(Register, Offset); 261 MCCFIInstruction Instruction(MCCFIInstruction::RelMove, Label, Dest, Source); 262 CurFrame->Instructions.push_back(Instruction); 263} 264 265void MCStreamer::EmitCFIPersonality(const MCSymbol *Sym, 266 unsigned Encoding) { 267 EnsureValidFrame(); 268 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 269 CurFrame->Personality = Sym; 270 CurFrame->PersonalityEncoding = Encoding; 271} 272 273void MCStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) { 274 EnsureValidFrame(); 275 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 276 CurFrame->Lsda = Sym; 277 CurFrame->LsdaEncoding = Encoding; 278} 279 280void MCStreamer::EmitCFIRememberState() { 281 EnsureValidFrame(); 282 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 283 MCSymbol *Label = getContext().CreateTempSymbol(); 284 EmitLabel(Label); 285 MCCFIInstruction Instruction(MCCFIInstruction::Remember, Label); 286 CurFrame->Instructions.push_back(Instruction); 287} 288 289void MCStreamer::EmitCFIRestoreState() { 290 // FIXME: Error if there is no matching cfi_remember_state. 291 EnsureValidFrame(); 292 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 293 MCSymbol *Label = getContext().CreateTempSymbol(); 294 EmitLabel(Label); 295 MCCFIInstruction Instruction(MCCFIInstruction::Restore, Label); 296 CurFrame->Instructions.push_back(Instruction); 297} 298 299void MCStreamer::EmitCFISameValue(int64_t Register) { 300 EnsureValidFrame(); 301 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); 302 MCSymbol *Label = getContext().CreateTempSymbol(); 303 EmitLabel(Label); 304 MCCFIInstruction Instruction(MCCFIInstruction::SameValue, Label, Register); 305 CurFrame->Instructions.push_back(Instruction); 306} 307 308void MCStreamer::setCurrentW64UnwindInfo(MCWin64EHUnwindInfo *Frame) { 309 W64UnwindInfos.push_back(*Frame); 310 CurrentW64UnwindInfo = &W64UnwindInfos.back(); 311} 312 313void MCStreamer::EnsureValidW64UnwindInfo() { 314 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo; 315 if (!CurFrame || CurFrame->End) 316 report_fatal_error("No open Win64 EH frame function!"); 317} 318 319void MCStreamer::EmitWin64EHStartProc(MCSymbol *Symbol) { 320 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo; 321 if (CurFrame && !CurFrame->End) 322 report_fatal_error("Starting a function before ending the previous one!"); 323 MCWin64EHUnwindInfo Frame; 324 Frame.Begin = getContext().CreateTempSymbol(); 325 Frame.Function = Symbol; 326 EmitLabel(Frame.Begin); 327 setCurrentW64UnwindInfo(&Frame); 328} 329 330void MCStreamer::EmitWin64EHEndProc() { 331 EnsureValidW64UnwindInfo(); 332 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo; 333 if (CurFrame->ChainedParent) 334 report_fatal_error("Not all chained regions terminated!"); 335 CurFrame->End = getContext().CreateTempSymbol(); 336 EmitLabel(CurFrame->End); 337} 338 339void MCStreamer::EmitWin64EHStartChained() { 340 EnsureValidW64UnwindInfo(); 341 MCWin64EHUnwindInfo Frame; 342 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo; 343 Frame.Begin = getContext().CreateTempSymbol(); 344 Frame.Function = CurFrame->Function; 345 Frame.ChainedParent = CurFrame; 346 EmitLabel(Frame.Begin); 347 setCurrentW64UnwindInfo(&Frame); 348} 349 350void MCStreamer::EmitWin64EHEndChained() { 351 EnsureValidW64UnwindInfo(); 352 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo; 353 if (!CurFrame->ChainedParent) 354 report_fatal_error("End of a chained region outside a chained region!"); 355 CurFrame->End = getContext().CreateTempSymbol(); 356 EmitLabel(CurFrame->End); 357 CurrentW64UnwindInfo = CurFrame->ChainedParent; 358} 359 360void MCStreamer::EmitWin64EHHandler(const MCSymbol *Sym, bool Unwind, 361 bool Except) { 362 EnsureValidW64UnwindInfo(); 363 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo; 364 CurFrame->ExceptionHandler = Sym; 365 if (Unwind) 366 CurFrame->UnwindOnly = true; 367 else if (!Except) 368 report_fatal_error("Don't know what kind of handler this is!"); 369} 370 371void MCStreamer::EmitWin64EHHandlerData() { 372 EnsureValidW64UnwindInfo(); 373} 374 375void MCStreamer::EmitWin64EHPushReg(unsigned Register) { 376 EnsureValidW64UnwindInfo(); 377 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo; 378 MCWin64EHInstruction Inst(Win64EH::UOP_PushNonVol, Register); 379 CurFrame->Instructions.push_back(Inst); 380} 381 382void MCStreamer::EmitWin64EHSetFrame(unsigned Register, unsigned Offset) { 383 EnsureValidW64UnwindInfo(); 384 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo; 385 MCWin64EHInstruction Inst(Win64EH::UOP_SetFPReg, Register, Offset); 386 CurFrame->Instructions.push_back(Inst); 387} 388 389void MCStreamer::EmitWin64EHAllocStack(unsigned Size) { 390 EnsureValidW64UnwindInfo(); 391 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo; 392 MCWin64EHInstruction Inst(Size); 393 CurFrame->Instructions.push_back(Inst); 394} 395 396void MCStreamer::EmitWin64EHSaveReg(unsigned Register, unsigned Offset) { 397 EnsureValidW64UnwindInfo(); 398 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo; 399 MCWin64EHInstruction Inst( 400 Offset > 0xFFFF ? Win64EH::UOP_SaveNonVol : Win64EH::UOP_SaveNonVolBig, 401 Register, Offset); 402 CurFrame->Instructions.push_back(Inst); 403} 404 405void MCStreamer::EmitWin64EHSaveXMM(unsigned Register, unsigned Offset) { 406 EnsureValidW64UnwindInfo(); 407 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo; 408 MCWin64EHInstruction Inst( 409 Offset > 0xFFFF ? Win64EH::UOP_SaveXMM128 : Win64EH::UOP_SaveXMM128Big, 410 Register, Offset); 411 CurFrame->Instructions.push_back(Inst); 412} 413 414void MCStreamer::EmitWin64EHPushFrame(bool Code) { 415 EnsureValidW64UnwindInfo(); 416 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo; 417 MCWin64EHInstruction Inst(Win64EH::UOP_PushMachFrame, Code); 418 CurFrame->Instructions.push_back(Inst); 419} 420 421void MCStreamer::EmitWin64EHEndProlog() { 422 EnsureValidW64UnwindInfo(); 423 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo; 424 CurFrame->PrologEnd = getContext().CreateTempSymbol(); 425 EmitLabel(CurFrame->PrologEnd); 426} 427 428void MCStreamer::EmitFnStart() { 429 errs() << "Not implemented yet\n"; 430 abort(); 431} 432 433void MCStreamer::EmitFnEnd() { 434 errs() << "Not implemented yet\n"; 435 abort(); 436} 437 438void MCStreamer::EmitCantUnwind() { 439 errs() << "Not implemented yet\n"; 440 abort(); 441} 442 443void MCStreamer::EmitHandlerData() { 444 errs() << "Not implemented yet\n"; 445 abort(); 446} 447 448void MCStreamer::EmitPersonality(const MCSymbol *Personality) { 449 errs() << "Not implemented yet\n"; 450 abort(); 451} 452 453void MCStreamer::EmitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset) { 454 errs() << "Not implemented yet\n"; 455 abort(); 456} 457 458void MCStreamer::EmitPad(int64_t Offset) { 459 errs() << "Not implemented yet\n"; 460 abort(); 461} 462 463void MCStreamer::EmitRegSave(const SmallVectorImpl<unsigned> &RegList, bool) { 464 errs() << "Not implemented yet\n"; 465 abort(); 466} 467 468/// EmitRawText - If this file is backed by an assembly streamer, this dumps 469/// the specified string in the output .s file. This capability is 470/// indicated by the hasRawTextSupport() predicate. 471void MCStreamer::EmitRawText(StringRef String) { 472 errs() << "EmitRawText called on an MCStreamer that doesn't support it, " 473 " something must not be fully mc'ized\n"; 474 abort(); 475} 476 477void MCStreamer::EmitRawText(const Twine &T) { 478 SmallString<128> Str; 479 T.toVector(Str); 480 EmitRawText(Str.str()); 481} 482 483void MCStreamer::EmitFrames(bool usingCFI) { 484 if (!getNumFrameInfos()) 485 return; 486 487 if (EmitEHFrame) 488 MCDwarfFrameEmitter::Emit(*this, usingCFI, true); 489 490 if (EmitDebugFrame) 491 MCDwarfFrameEmitter::Emit(*this, usingCFI, false); 492} 493