1 //===- lib/MC/MCStreamer.cpp - Streaming Machine Code Output --------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
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"
23 MCStreamer::MCStreamer(MCContext &Ctx) : Context(Ctx), EmitEHFrame(true),
24 EmitDebugFrame(false) {
25 const MCSection *section = NULL;
26 SectionStack.push_back(std::make_pair(section, section));
29 MCStreamer::~MCStreamer() {
32 const MCExpr *MCStreamer::BuildSymbolDiff(MCContext &Context,
35 MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
37 MCSymbolRefExpr::Create(A, Variant, Context);
39 MCSymbolRefExpr::Create(B, Variant, Context);
40 const MCExpr *AddrDelta =
41 MCBinaryExpr::Create(MCBinaryExpr::Sub, ARef, BRef, Context);
45 const MCExpr *MCStreamer::ForceExpAbs(const MCExpr* Expr) {
46 if (Context.getAsmInfo().hasAggressiveSymbolFolding())
49 MCSymbol *ABS = Context.CreateTempSymbol();
50 EmitAssignment(ABS, Expr);
51 return MCSymbolRefExpr::Create(ABS, Context);
54 raw_ostream &MCStreamer::GetCommentOS() {
55 // By default, discard comments.
59 void MCStreamer::EmitDwarfSetLineAddr(int64_t LineDelta,
60 const MCSymbol *Label, int PointerSize) {
61 // emit the sequence to set the address
62 EmitIntValue(dwarf::DW_LNS_extended_op, 1);
63 EmitULEB128IntValue(PointerSize + 1);
64 EmitIntValue(dwarf::DW_LNE_set_address, 1);
65 EmitSymbolValue(Label, PointerSize);
67 // emit the sequence for the LineDelta (from 1) and a zero address delta.
68 MCDwarfLineAddr::Emit(this, LineDelta, 0);
71 /// EmitIntValue - Special case of EmitValue that avoids the client having to
72 /// pass in a MCExpr for constant integers.
73 void MCStreamer::EmitIntValue(uint64_t Value, unsigned Size,
75 assert(Size <= 8 && "Invalid size");
76 assert((isUIntN(8 * Size, Value) || isIntN(8 * Size, Value)) &&
79 // FIXME: Endianness assumption.
80 for (unsigned i = 0; i != Size; ++i)
81 buf[i] = uint8_t(Value >> (i * 8));
82 EmitBytes(StringRef(buf, Size), AddrSpace);
85 /// EmitULEB128Value - Special case of EmitULEB128Value that avoids the
86 /// client having to pass in a MCExpr for constant integers.
87 void MCStreamer::EmitULEB128IntValue(uint64_t Value, unsigned AddrSpace) {
89 raw_svector_ostream OSE(Tmp);
90 MCObjectWriter::EncodeULEB128(Value, OSE);
91 EmitBytes(OSE.str(), AddrSpace);
94 /// EmitSLEB128Value - Special case of EmitSLEB128Value that avoids the
95 /// client having to pass in a MCExpr for constant integers.
96 void MCStreamer::EmitSLEB128IntValue(int64_t Value, unsigned AddrSpace) {
98 raw_svector_ostream OSE(Tmp);
99 MCObjectWriter::EncodeSLEB128(Value, OSE);
100 EmitBytes(OSE.str(), AddrSpace);
103 void MCStreamer::EmitAbsValue(const MCExpr *Value, unsigned Size,
104 unsigned AddrSpace) {
105 const MCExpr *ABS = ForceExpAbs(Value);
106 EmitValue(ABS, Size, AddrSpace);
110 void MCStreamer::EmitValue(const MCExpr *Value, unsigned Size,
111 unsigned AddrSpace) {
112 EmitValueImpl(Value, Size, AddrSpace);
115 void MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size,
116 unsigned AddrSpace) {
117 EmitValueImpl(MCSymbolRefExpr::Create(Sym, getContext()), Size,
121 void MCStreamer::EmitGPRel32Value(const MCExpr *Value) {
122 report_fatal_error("unsupported directive in streamer");
125 /// EmitFill - Emit NumBytes bytes worth of the value specified by
126 /// FillValue. This implements directives such as '.space'.
127 void MCStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue,
128 unsigned AddrSpace) {
129 const MCExpr *E = MCConstantExpr::Create(FillValue, getContext());
130 for (uint64_t i = 0, e = NumBytes; i != e; ++i)
131 EmitValue(E, 1, AddrSpace);
134 bool MCStreamer::EmitDwarfFileDirective(unsigned FileNo,
135 StringRef Filename) {
136 return getContext().GetDwarfFile(Filename, FileNo) == 0;
139 void MCStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
140 unsigned Column, unsigned Flags,
142 unsigned Discriminator,
143 StringRef FileName) {
144 getContext().setCurrentDwarfLoc(FileNo, Line, Column, Flags, Isa,
148 MCDwarfFrameInfo *MCStreamer::getCurrentFrameInfo() {
149 if (FrameInfos.empty())
151 return &FrameInfos.back();
154 void MCStreamer::EnsureValidFrame() {
155 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
156 if (!CurFrame || CurFrame->End)
157 report_fatal_error("No open frame");
160 void MCStreamer::EmitEHSymAttributes(const MCSymbol *Symbol,
161 MCSymbol *EHSymbol) {
164 void MCStreamer::EmitLabel(MCSymbol *Symbol) {
165 assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
166 assert(getCurrentSection() && "Cannot emit before setting section!");
167 Symbol->setSection(*getCurrentSection());
169 StringRef Prefix = getContext().getAsmInfo().getPrivateGlobalPrefix();
170 if (!Symbol->getName().startswith(Prefix))
171 LastNonPrivate = Symbol;
174 void MCStreamer::EmitCFISections(bool EH, bool Debug) {
177 EmitDebugFrame = Debug;
180 void MCStreamer::EmitCFIStartProc() {
181 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
182 if (CurFrame && !CurFrame->End)
183 report_fatal_error("Starting a frame before finishing the previous one!");
184 MCDwarfFrameInfo Frame;
185 Frame.Begin = getContext().CreateTempSymbol();
186 Frame.Function = LastNonPrivate;
187 EmitLabel(Frame.Begin);
188 FrameInfos.push_back(Frame);
191 void MCStreamer::EmitCFIEndProc() {
193 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
194 CurFrame->End = getContext().CreateTempSymbol();
195 EmitLabel(CurFrame->End);
198 void MCStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) {
200 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
201 MCSymbol *Label = getContext().CreateTempSymbol();
203 MachineLocation Dest(MachineLocation::VirtualFP);
204 MachineLocation Source(Register, -Offset);
205 MCCFIInstruction Instruction(Label, Dest, Source);
206 CurFrame->Instructions.push_back(Instruction);
209 void MCStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
211 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
212 MCSymbol *Label = getContext().CreateTempSymbol();
214 MachineLocation Dest(MachineLocation::VirtualFP);
215 MachineLocation Source(MachineLocation::VirtualFP, -Offset);
216 MCCFIInstruction Instruction(Label, Dest, Source);
217 CurFrame->Instructions.push_back(Instruction);
220 void MCStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) {
222 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
223 MCSymbol *Label = getContext().CreateTempSymbol();
225 MachineLocation Dest(MachineLocation::VirtualFP);
226 MachineLocation Source(MachineLocation::VirtualFP, Adjustment);
227 MCCFIInstruction Instruction(MCCFIInstruction::RelMove, Label, Dest, Source);
228 CurFrame->Instructions.push_back(Instruction);
231 void MCStreamer::EmitCFIDefCfaRegister(int64_t Register) {
233 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
234 MCSymbol *Label = getContext().CreateTempSymbol();
236 MachineLocation Dest(Register);
237 MachineLocation Source(MachineLocation::VirtualFP);
238 MCCFIInstruction Instruction(Label, Dest, Source);
239 CurFrame->Instructions.push_back(Instruction);
242 void MCStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) {
244 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
245 MCSymbol *Label = getContext().CreateTempSymbol();
247 MachineLocation Dest(Register, Offset);
248 MachineLocation Source(Register, Offset);
249 MCCFIInstruction Instruction(Label, Dest, Source);
250 CurFrame->Instructions.push_back(Instruction);
253 void MCStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset) {
255 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
256 MCSymbol *Label = getContext().CreateTempSymbol();
258 MachineLocation Dest(Register, Offset);
259 MachineLocation Source(Register, Offset);
260 MCCFIInstruction Instruction(MCCFIInstruction::RelMove, Label, Dest, Source);
261 CurFrame->Instructions.push_back(Instruction);
264 void MCStreamer::EmitCFIPersonality(const MCSymbol *Sym,
267 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
268 CurFrame->Personality = Sym;
269 CurFrame->PersonalityEncoding = Encoding;
272 void MCStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) {
274 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
275 CurFrame->Lsda = Sym;
276 CurFrame->LsdaEncoding = Encoding;
279 void MCStreamer::EmitCFIRememberState() {
281 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
282 MCSymbol *Label = getContext().CreateTempSymbol();
284 MCCFIInstruction Instruction(MCCFIInstruction::Remember, Label);
285 CurFrame->Instructions.push_back(Instruction);
288 void MCStreamer::EmitCFIRestoreState() {
289 // FIXME: Error if there is no matching cfi_remember_state.
291 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
292 MCSymbol *Label = getContext().CreateTempSymbol();
294 MCCFIInstruction Instruction(MCCFIInstruction::Restore, Label);
295 CurFrame->Instructions.push_back(Instruction);
298 void MCStreamer::EmitCFISameValue(int64_t Register) {
300 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
301 MCSymbol *Label = getContext().CreateTempSymbol();
303 MCCFIInstruction Instruction(MCCFIInstruction::SameValue, Label, Register);
304 CurFrame->Instructions.push_back(Instruction);
307 void MCStreamer::setCurrentW64UnwindInfo(MCWin64EHUnwindInfo *Frame) {
308 W64UnwindInfos.push_back(*Frame);
309 CurrentW64UnwindInfo = &W64UnwindInfos.back();
312 void MCStreamer::EnsureValidW64UnwindInfo() {
313 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
314 if (!CurFrame || CurFrame->End)
315 report_fatal_error("No open Win64 EH frame function!");
318 void MCStreamer::EmitWin64EHStartProc(MCSymbol *Symbol) {
319 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
320 if (CurFrame && !CurFrame->End)
321 report_fatal_error("Starting a function before ending the previous one!");
322 MCWin64EHUnwindInfo Frame;
323 Frame.Begin = getContext().CreateTempSymbol();
324 Frame.Function = Symbol;
325 EmitLabel(Frame.Begin);
326 setCurrentW64UnwindInfo(&Frame);
329 void MCStreamer::EmitWin64EHEndProc() {
330 EnsureValidW64UnwindInfo();
331 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
332 if (CurFrame->ChainedParent)
333 report_fatal_error("Not all chained regions terminated!");
334 CurFrame->End = getContext().CreateTempSymbol();
335 EmitLabel(CurFrame->End);
338 void MCStreamer::EmitWin64EHStartChained() {
339 EnsureValidW64UnwindInfo();
340 MCWin64EHUnwindInfo Frame;
341 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
342 Frame.Begin = getContext().CreateTempSymbol();
343 Frame.Function = CurFrame->Function;
344 Frame.ChainedParent = CurFrame;
345 EmitLabel(Frame.Begin);
346 setCurrentW64UnwindInfo(&Frame);
349 void MCStreamer::EmitWin64EHEndChained() {
350 EnsureValidW64UnwindInfo();
351 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
352 if (!CurFrame->ChainedParent)
353 report_fatal_error("End of a chained region outside a chained region!");
354 CurFrame->End = getContext().CreateTempSymbol();
355 EmitLabel(CurFrame->End);
356 CurrentW64UnwindInfo = CurFrame->ChainedParent;
359 void MCStreamer::EmitWin64EHHandler(const MCSymbol *Sym, bool Unwind,
361 EnsureValidW64UnwindInfo();
362 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
363 CurFrame->ExceptionHandler = Sym;
365 CurFrame->UnwindOnly = true;
367 report_fatal_error("Don't know what kind of handler this is!");
370 void MCStreamer::EmitWin64EHHandlerData() {
371 errs() << "Not implemented yet\n";
375 void MCStreamer::EmitWin64EHPushReg(unsigned Register) {
376 EnsureValidW64UnwindInfo();
377 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
378 MCWin64EHInstruction Inst(Win64EH::UOP_PushNonVol, Register);
379 CurFrame->Instructions.push_back(Inst);
382 void 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);
389 void MCStreamer::EmitWin64EHAllocStack(unsigned Size) {
390 EnsureValidW64UnwindInfo();
391 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
392 MCWin64EHInstruction Inst(Size);
393 CurFrame->Instructions.push_back(Inst);
396 void MCStreamer::EmitWin64EHSaveReg(unsigned Register, unsigned Offset) {
397 EnsureValidW64UnwindInfo();
398 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
399 MCWin64EHInstruction Inst(
400 Offset > 0xFFFF ? Win64EH::UOP_SaveNonVol : Win64EH::UOP_SaveNonVolBig,
402 CurFrame->Instructions.push_back(Inst);
405 void MCStreamer::EmitWin64EHSaveXMM(unsigned Register, unsigned Offset) {
406 EnsureValidW64UnwindInfo();
407 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
408 MCWin64EHInstruction Inst(
409 Offset > 0xFFFF ? Win64EH::UOP_SaveXMM128 : Win64EH::UOP_SaveXMM128Big,
411 CurFrame->Instructions.push_back(Inst);
414 void MCStreamer::EmitWin64EHPushFrame(bool Code) {
415 EnsureValidW64UnwindInfo();
416 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
417 MCWin64EHInstruction Inst(Win64EH::UOP_PushMachFrame, Code);
418 CurFrame->Instructions.push_back(Inst);
421 void MCStreamer::EmitWin64EHEndProlog() {
422 EnsureValidW64UnwindInfo();
423 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
424 CurFrame->PrologEnd = getContext().CreateTempSymbol();
425 EmitLabel(CurFrame->PrologEnd);
428 void MCStreamer::EmitFnStart() {
429 errs() << "Not implemented yet\n";
433 void MCStreamer::EmitFnEnd() {
434 errs() << "Not implemented yet\n";
438 void MCStreamer::EmitCantUnwind() {
439 errs() << "Not implemented yet\n";
443 void MCStreamer::EmitHandlerData() {
444 errs() << "Not implemented yet\n";
448 void MCStreamer::EmitPersonality(const MCSymbol *Personality) {
449 errs() << "Not implemented yet\n";
453 void MCStreamer::EmitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset) {
454 errs() << "Not implemented yet\n";
458 void MCStreamer::EmitPad(int64_t Offset) {
459 errs() << "Not implemented yet\n";
463 void MCStreamer::EmitRegSave(const SmallVectorImpl<unsigned> &RegList, bool) {
464 errs() << "Not implemented yet\n";
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.
471 void 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";
477 void MCStreamer::EmitRawText(const Twine &T) {
478 SmallString<128> Str;
480 EmitRawText(Str.str());
483 void MCStreamer::EmitFrames(bool usingCFI) {
484 if (!getNumFrameInfos())
488 MCDwarfFrameEmitter::Emit(*this, usingCFI, true);
491 MCDwarfFrameEmitter::Emit(*this, usingCFI, false);