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>
21 using namespace llvm;
22
MCStreamer(MCContext & Ctx)23 MCStreamer::MCStreamer(MCContext &Ctx) : Context(Ctx), EmitEHFrame(true),
24 EmitDebugFrame(false),
25 CurrentW64UnwindInfo(0),
26 LastSymbol(0),
27 UniqueCodeBeginSuffix(0),
28 UniqueDataBeginSuffix(0) {
29 const MCSection *section = NULL;
30 SectionStack.push_back(std::make_pair(section, section));
31 }
32
~MCStreamer()33 MCStreamer::~MCStreamer() {
34 for (unsigned i = 0; i < getNumW64UnwindInfos(); ++i)
35 delete W64UnwindInfos[i];
36 }
37
BuildSymbolDiff(MCContext & Context,const MCSymbol * A,const MCSymbol * B)38 const MCExpr *MCStreamer::BuildSymbolDiff(MCContext &Context,
39 const MCSymbol *A,
40 const MCSymbol *B) {
41 MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
42 const MCExpr *ARef =
43 MCSymbolRefExpr::Create(A, Variant, Context);
44 const MCExpr *BRef =
45 MCSymbolRefExpr::Create(B, Variant, Context);
46 const MCExpr *AddrDelta =
47 MCBinaryExpr::Create(MCBinaryExpr::Sub, ARef, BRef, Context);
48 return AddrDelta;
49 }
50
ForceExpAbs(const MCExpr * Expr)51 const MCExpr *MCStreamer::ForceExpAbs(const MCExpr* Expr) {
52 if (Context.getAsmInfo().hasAggressiveSymbolFolding() ||
53 isa<MCSymbolRefExpr>(Expr))
54 return Expr;
55
56 MCSymbol *ABS = Context.CreateTempSymbol();
57 EmitAssignment(ABS, Expr);
58 return MCSymbolRefExpr::Create(ABS, Context);
59 }
60
GetCommentOS()61 raw_ostream &MCStreamer::GetCommentOS() {
62 // By default, discard comments.
63 return nulls();
64 }
65
EmitDwarfSetLineAddr(int64_t LineDelta,const MCSymbol * Label,int PointerSize)66 void MCStreamer::EmitDwarfSetLineAddr(int64_t LineDelta,
67 const MCSymbol *Label, int PointerSize) {
68 // emit the sequence to set the address
69 EmitIntValue(dwarf::DW_LNS_extended_op, 1);
70 EmitULEB128IntValue(PointerSize + 1);
71 EmitIntValue(dwarf::DW_LNE_set_address, 1);
72 EmitSymbolValue(Label, PointerSize);
73
74 // emit the sequence for the LineDelta (from 1) and a zero address delta.
75 MCDwarfLineAddr::Emit(this, LineDelta, 0);
76 }
77
78 /// EmitIntValue - Special case of EmitValue that avoids the client having to
79 /// pass in a MCExpr for constant integers.
EmitIntValue(uint64_t Value,unsigned Size,unsigned AddrSpace)80 void MCStreamer::EmitIntValue(uint64_t Value, unsigned Size,
81 unsigned AddrSpace) {
82 assert(Size <= 8 && "Invalid size");
83 assert((isUIntN(8 * Size, Value) || isIntN(8 * Size, Value)) &&
84 "Invalid size");
85 char buf[8];
86 const bool isLittleEndian = Context.getAsmInfo().isLittleEndian();
87 for (unsigned i = 0; i != Size; ++i) {
88 unsigned index = isLittleEndian ? i : (Size - i - 1);
89 buf[i] = uint8_t(Value >> (index * 8));
90 }
91 EmitBytes(StringRef(buf, Size), AddrSpace);
92 }
93
94 /// EmitULEB128Value - Special case of EmitULEB128Value that avoids the
95 /// client having to pass in a MCExpr for constant integers.
EmitULEB128IntValue(uint64_t Value,unsigned AddrSpace,unsigned Padding)96 void MCStreamer::EmitULEB128IntValue(uint64_t Value, unsigned AddrSpace,
97 unsigned Padding) {
98 SmallString<128> Tmp;
99 raw_svector_ostream OSE(Tmp);
100 MCObjectWriter::EncodeULEB128(Value, OSE, Padding);
101 EmitBytes(OSE.str(), AddrSpace);
102 }
103
104 /// EmitSLEB128Value - Special case of EmitSLEB128Value that avoids the
105 /// client having to pass in a MCExpr for constant integers.
EmitSLEB128IntValue(int64_t Value,unsigned AddrSpace)106 void MCStreamer::EmitSLEB128IntValue(int64_t Value, unsigned AddrSpace) {
107 SmallString<128> Tmp;
108 raw_svector_ostream OSE(Tmp);
109 MCObjectWriter::EncodeSLEB128(Value, OSE);
110 EmitBytes(OSE.str(), AddrSpace);
111 }
112
EmitAbsValue(const MCExpr * Value,unsigned Size,unsigned AddrSpace)113 void MCStreamer::EmitAbsValue(const MCExpr *Value, unsigned Size,
114 unsigned AddrSpace) {
115 const MCExpr *ABS = ForceExpAbs(Value);
116 EmitValue(ABS, Size, AddrSpace);
117 }
118
119
EmitValue(const MCExpr * Value,unsigned Size,unsigned AddrSpace)120 void MCStreamer::EmitValue(const MCExpr *Value, unsigned Size,
121 unsigned AddrSpace) {
122 EmitValueImpl(Value, Size, AddrSpace);
123 }
124
EmitSymbolValue(const MCSymbol * Sym,unsigned Size,unsigned AddrSpace)125 void MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size,
126 unsigned AddrSpace) {
127 EmitValueImpl(MCSymbolRefExpr::Create(Sym, getContext()), Size,
128 AddrSpace);
129 }
130
EmitGPRel64Value(const MCExpr * Value)131 void MCStreamer::EmitGPRel64Value(const MCExpr *Value) {
132 report_fatal_error("unsupported directive in streamer");
133 }
134
EmitGPRel32Value(const MCExpr * Value)135 void MCStreamer::EmitGPRel32Value(const MCExpr *Value) {
136 report_fatal_error("unsupported directive in streamer");
137 }
138
139 /// EmitFill - Emit NumBytes bytes worth of the value specified by
140 /// FillValue. This implements directives such as '.space'.
EmitFill(uint64_t NumBytes,uint8_t FillValue,unsigned AddrSpace)141 void MCStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue,
142 unsigned AddrSpace) {
143 const MCExpr *E = MCConstantExpr::Create(FillValue, getContext());
144 for (uint64_t i = 0, e = NumBytes; i != e; ++i)
145 EmitValue(E, 1, AddrSpace);
146 }
147
EmitDwarfFileDirective(unsigned FileNo,StringRef Directory,StringRef Filename)148 bool MCStreamer::EmitDwarfFileDirective(unsigned FileNo,
149 StringRef Directory,
150 StringRef Filename) {
151 return getContext().GetDwarfFile(Directory, Filename, FileNo) == 0;
152 }
153
EmitDwarfLocDirective(unsigned FileNo,unsigned Line,unsigned Column,unsigned Flags,unsigned Isa,unsigned Discriminator,StringRef FileName)154 void MCStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
155 unsigned Column, unsigned Flags,
156 unsigned Isa,
157 unsigned Discriminator,
158 StringRef FileName) {
159 getContext().setCurrentDwarfLoc(FileNo, Line, Column, Flags, Isa,
160 Discriminator);
161 }
162
getCurrentFrameInfo()163 MCDwarfFrameInfo *MCStreamer::getCurrentFrameInfo() {
164 if (FrameInfos.empty())
165 return NULL;
166 return &FrameInfos.back();
167 }
168
EnsureValidFrame()169 void MCStreamer::EnsureValidFrame() {
170 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
171 if (!CurFrame || CurFrame->End)
172 report_fatal_error("No open frame");
173 }
174
EmitEHSymAttributes(const MCSymbol * Symbol,MCSymbol * EHSymbol)175 void MCStreamer::EmitEHSymAttributes(const MCSymbol *Symbol,
176 MCSymbol *EHSymbol) {
177 }
178
EmitLabel(MCSymbol * Symbol)179 void MCStreamer::EmitLabel(MCSymbol *Symbol) {
180 assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
181 assert(getCurrentSection() && "Cannot emit before setting section!");
182 Symbol->setSection(*getCurrentSection());
183 LastSymbol = Symbol;
184 }
185
EmitDataRegion()186 void MCStreamer::EmitDataRegion() {
187 if (RegionIndicator == Data) return;
188
189 MCContext &Context = getContext();
190 const MCAsmInfo &MAI = Context.getAsmInfo();
191 if (!MAI.getSupportsDataRegions()) return;
192
193 // Generate a unique symbol name.
194 MCSymbol *NewSym = Context.GetOrCreateSymbol(MAI.getDataBeginLabelName() +
195 Twine(UniqueDataBeginSuffix++));
196 EmitLabel(NewSym);
197
198 RegionIndicator = Data;
199 }
200
EmitCodeRegion()201 void MCStreamer::EmitCodeRegion() {
202 if (RegionIndicator == Code) return;
203
204 MCContext &Context = getContext();
205 const MCAsmInfo &MAI = Context.getAsmInfo();
206 if (!MAI.getSupportsDataRegions()) return;
207
208 // Generate a unique symbol name.
209 MCSymbol *NewSym = Context.GetOrCreateSymbol(MAI.getCodeBeginLabelName() +
210 Twine(UniqueCodeBeginSuffix++));
211 EmitLabel(NewSym);
212
213 RegionIndicator = Code;
214 }
215
EmitJumpTable8Region()216 void MCStreamer::EmitJumpTable8Region() {
217 if (RegionIndicator == JumpTable8) return;
218
219 MCContext &Context = getContext();
220 const MCAsmInfo &MAI = Context.getAsmInfo();
221 if (!MAI.getSupportsDataRegions()) return;
222
223 // Generate a unique symbol name.
224 MCSymbol *NewSym =
225 Context.GetOrCreateSymbol(MAI.getJumpTable8BeginLabelName() +
226 Twine(UniqueDataBeginSuffix++));
227 EmitLabel(NewSym);
228
229 RegionIndicator = JumpTable8;
230 }
231
EmitJumpTable16Region()232 void MCStreamer::EmitJumpTable16Region() {
233 if (RegionIndicator == JumpTable16) return;
234
235 MCContext &Context = getContext();
236 const MCAsmInfo &MAI = Context.getAsmInfo();
237 if (!MAI.getSupportsDataRegions()) return;
238
239 // Generate a unique symbol name.
240 MCSymbol *NewSym =
241 Context.GetOrCreateSymbol(MAI.getJumpTable16BeginLabelName() +
242 Twine(UniqueDataBeginSuffix++));
243 EmitLabel(NewSym);
244
245 RegionIndicator = JumpTable16;
246 }
247
248
EmitJumpTable32Region()249 void MCStreamer::EmitJumpTable32Region() {
250 if (RegionIndicator == JumpTable32) return;
251
252 MCContext &Context = getContext();
253 const MCAsmInfo &MAI = Context.getAsmInfo();
254 if (!MAI.getSupportsDataRegions()) return;
255
256 // Generate a unique symbol name.
257 MCSymbol *NewSym =
258 Context.GetOrCreateSymbol(MAI.getJumpTable32BeginLabelName() +
259 Twine(UniqueDataBeginSuffix++));
260 EmitLabel(NewSym);
261
262 RegionIndicator = JumpTable32;
263 }
264
EmitCompactUnwindEncoding(uint32_t CompactUnwindEncoding)265 void MCStreamer::EmitCompactUnwindEncoding(uint32_t CompactUnwindEncoding) {
266 EnsureValidFrame();
267 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
268 CurFrame->CompactUnwindEncoding = CompactUnwindEncoding;
269 }
270
EmitCFISections(bool EH,bool Debug)271 void MCStreamer::EmitCFISections(bool EH, bool Debug) {
272 assert(EH || Debug);
273 EmitEHFrame = EH;
274 EmitDebugFrame = Debug;
275 }
276
EmitCFIStartProc()277 void MCStreamer::EmitCFIStartProc() {
278 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
279 if (CurFrame && !CurFrame->End)
280 report_fatal_error("Starting a frame before finishing the previous one!");
281
282 MCDwarfFrameInfo Frame;
283 EmitCFIStartProcImpl(Frame);
284
285 FrameInfos.push_back(Frame);
286 RegionIndicator = Code;
287 }
288
EmitCFIStartProcImpl(MCDwarfFrameInfo & Frame)289 void MCStreamer::EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame) {
290 }
291
RecordProcStart(MCDwarfFrameInfo & Frame)292 void MCStreamer::RecordProcStart(MCDwarfFrameInfo &Frame) {
293 Frame.Function = LastSymbol;
294 // If the function is externally visible, we need to create a local
295 // symbol to avoid relocations.
296 StringRef Prefix = getContext().getAsmInfo().getPrivateGlobalPrefix();
297 if (LastSymbol && LastSymbol->getName().startswith(Prefix)) {
298 Frame.Begin = LastSymbol;
299 } else {
300 Frame.Begin = getContext().CreateTempSymbol();
301 EmitLabel(Frame.Begin);
302 }
303 }
304
EmitCFIEndProc()305 void MCStreamer::EmitCFIEndProc() {
306 EnsureValidFrame();
307 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
308 EmitCFIEndProcImpl(*CurFrame);
309 }
310
EmitCFIEndProcImpl(MCDwarfFrameInfo & Frame)311 void MCStreamer::EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {
312 }
313
RecordProcEnd(MCDwarfFrameInfo & Frame)314 void MCStreamer::RecordProcEnd(MCDwarfFrameInfo &Frame) {
315 Frame.End = getContext().CreateTempSymbol();
316 EmitLabel(Frame.End);
317 }
318
EmitCFIDefCfa(int64_t Register,int64_t Offset)319 void MCStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) {
320 EnsureValidFrame();
321 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
322 MCSymbol *Label = getContext().CreateTempSymbol();
323 EmitLabel(Label);
324 MachineLocation Dest(MachineLocation::VirtualFP);
325 MachineLocation Source(Register, -Offset);
326 MCCFIInstruction Instruction(Label, Dest, Source);
327 CurFrame->Instructions.push_back(Instruction);
328 }
329
EmitCFIDefCfaOffset(int64_t Offset)330 void MCStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
331 EnsureValidFrame();
332 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
333 MCSymbol *Label = getContext().CreateTempSymbol();
334 EmitLabel(Label);
335 MachineLocation Dest(MachineLocation::VirtualFP);
336 MachineLocation Source(MachineLocation::VirtualFP, -Offset);
337 MCCFIInstruction Instruction(Label, Dest, Source);
338 CurFrame->Instructions.push_back(Instruction);
339 }
340
EmitCFIAdjustCfaOffset(int64_t Adjustment)341 void MCStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) {
342 EnsureValidFrame();
343 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
344 MCSymbol *Label = getContext().CreateTempSymbol();
345 EmitLabel(Label);
346 MachineLocation Dest(MachineLocation::VirtualFP);
347 MachineLocation Source(MachineLocation::VirtualFP, Adjustment);
348 MCCFIInstruction Instruction(MCCFIInstruction::RelMove, Label, Dest, Source);
349 CurFrame->Instructions.push_back(Instruction);
350 }
351
EmitCFIDefCfaRegister(int64_t Register)352 void MCStreamer::EmitCFIDefCfaRegister(int64_t Register) {
353 EnsureValidFrame();
354 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
355 MCSymbol *Label = getContext().CreateTempSymbol();
356 EmitLabel(Label);
357 MachineLocation Dest(Register);
358 MachineLocation Source(MachineLocation::VirtualFP);
359 MCCFIInstruction Instruction(Label, Dest, Source);
360 CurFrame->Instructions.push_back(Instruction);
361 }
362
EmitCFIOffset(int64_t Register,int64_t Offset)363 void MCStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) {
364 EnsureValidFrame();
365 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
366 MCSymbol *Label = getContext().CreateTempSymbol();
367 EmitLabel(Label);
368 MachineLocation Dest(Register, Offset);
369 MachineLocation Source(Register, Offset);
370 MCCFIInstruction Instruction(Label, Dest, Source);
371 CurFrame->Instructions.push_back(Instruction);
372 }
373
EmitCFIRelOffset(int64_t Register,int64_t Offset)374 void MCStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset) {
375 EnsureValidFrame();
376 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
377 MCSymbol *Label = getContext().CreateTempSymbol();
378 EmitLabel(Label);
379 MachineLocation Dest(Register, Offset);
380 MachineLocation Source(Register, Offset);
381 MCCFIInstruction Instruction(MCCFIInstruction::RelMove, Label, Dest, Source);
382 CurFrame->Instructions.push_back(Instruction);
383 }
384
EmitCFIPersonality(const MCSymbol * Sym,unsigned Encoding)385 void MCStreamer::EmitCFIPersonality(const MCSymbol *Sym,
386 unsigned Encoding) {
387 EnsureValidFrame();
388 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
389 CurFrame->Personality = Sym;
390 CurFrame->PersonalityEncoding = Encoding;
391 }
392
EmitCFILsda(const MCSymbol * Sym,unsigned Encoding)393 void MCStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) {
394 EnsureValidFrame();
395 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
396 CurFrame->Lsda = Sym;
397 CurFrame->LsdaEncoding = Encoding;
398 }
399
EmitCFIRememberState()400 void MCStreamer::EmitCFIRememberState() {
401 EnsureValidFrame();
402 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
403 MCSymbol *Label = getContext().CreateTempSymbol();
404 EmitLabel(Label);
405 MCCFIInstruction Instruction(MCCFIInstruction::RememberState, Label);
406 CurFrame->Instructions.push_back(Instruction);
407 }
408
EmitCFIRestoreState()409 void MCStreamer::EmitCFIRestoreState() {
410 // FIXME: Error if there is no matching cfi_remember_state.
411 EnsureValidFrame();
412 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
413 MCSymbol *Label = getContext().CreateTempSymbol();
414 EmitLabel(Label);
415 MCCFIInstruction Instruction(MCCFIInstruction::RestoreState, Label);
416 CurFrame->Instructions.push_back(Instruction);
417 }
418
EmitCFISameValue(int64_t Register)419 void MCStreamer::EmitCFISameValue(int64_t Register) {
420 EnsureValidFrame();
421 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
422 MCSymbol *Label = getContext().CreateTempSymbol();
423 EmitLabel(Label);
424 MCCFIInstruction Instruction(MCCFIInstruction::SameValue, Label, Register);
425 CurFrame->Instructions.push_back(Instruction);
426 }
427
EmitCFIRestore(int64_t Register)428 void MCStreamer::EmitCFIRestore(int64_t Register) {
429 EnsureValidFrame();
430 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
431 MCSymbol *Label = getContext().CreateTempSymbol();
432 EmitLabel(Label);
433 MCCFIInstruction Instruction(MCCFIInstruction::Restore, Label, Register);
434 CurFrame->Instructions.push_back(Instruction);
435 }
436
EmitCFIEscape(StringRef Values)437 void MCStreamer::EmitCFIEscape(StringRef Values) {
438 EnsureValidFrame();
439 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
440 MCSymbol *Label = getContext().CreateTempSymbol();
441 EmitLabel(Label);
442 MCCFIInstruction Instruction(MCCFIInstruction::Escape, Label, Values);
443 CurFrame->Instructions.push_back(Instruction);
444 }
445
EmitCFISignalFrame()446 void MCStreamer::EmitCFISignalFrame() {
447 EnsureValidFrame();
448 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
449 CurFrame->IsSignalFrame = true;
450 }
451
setCurrentW64UnwindInfo(MCWin64EHUnwindInfo * Frame)452 void MCStreamer::setCurrentW64UnwindInfo(MCWin64EHUnwindInfo *Frame) {
453 W64UnwindInfos.push_back(Frame);
454 CurrentW64UnwindInfo = W64UnwindInfos.back();
455 }
456
EnsureValidW64UnwindInfo()457 void MCStreamer::EnsureValidW64UnwindInfo() {
458 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
459 if (!CurFrame || CurFrame->End)
460 report_fatal_error("No open Win64 EH frame function!");
461 }
462
EmitWin64EHStartProc(const MCSymbol * Symbol)463 void MCStreamer::EmitWin64EHStartProc(const MCSymbol *Symbol) {
464 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
465 if (CurFrame && !CurFrame->End)
466 report_fatal_error("Starting a function before ending the previous one!");
467 MCWin64EHUnwindInfo *Frame = new MCWin64EHUnwindInfo;
468 Frame->Begin = getContext().CreateTempSymbol();
469 Frame->Function = Symbol;
470 EmitLabel(Frame->Begin);
471 setCurrentW64UnwindInfo(Frame);
472 }
473
EmitWin64EHEndProc()474 void MCStreamer::EmitWin64EHEndProc() {
475 EnsureValidW64UnwindInfo();
476 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
477 if (CurFrame->ChainedParent)
478 report_fatal_error("Not all chained regions terminated!");
479 CurFrame->End = getContext().CreateTempSymbol();
480 EmitLabel(CurFrame->End);
481 }
482
EmitWin64EHStartChained()483 void MCStreamer::EmitWin64EHStartChained() {
484 EnsureValidW64UnwindInfo();
485 MCWin64EHUnwindInfo *Frame = new MCWin64EHUnwindInfo;
486 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
487 Frame->Begin = getContext().CreateTempSymbol();
488 Frame->Function = CurFrame->Function;
489 Frame->ChainedParent = CurFrame;
490 EmitLabel(Frame->Begin);
491 setCurrentW64UnwindInfo(Frame);
492 }
493
EmitWin64EHEndChained()494 void MCStreamer::EmitWin64EHEndChained() {
495 EnsureValidW64UnwindInfo();
496 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
497 if (!CurFrame->ChainedParent)
498 report_fatal_error("End of a chained region outside a chained region!");
499 CurFrame->End = getContext().CreateTempSymbol();
500 EmitLabel(CurFrame->End);
501 CurrentW64UnwindInfo = CurFrame->ChainedParent;
502 }
503
EmitWin64EHHandler(const MCSymbol * Sym,bool Unwind,bool Except)504 void MCStreamer::EmitWin64EHHandler(const MCSymbol *Sym, bool Unwind,
505 bool Except) {
506 EnsureValidW64UnwindInfo();
507 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
508 if (CurFrame->ChainedParent)
509 report_fatal_error("Chained unwind areas can't have handlers!");
510 CurFrame->ExceptionHandler = Sym;
511 if (!Except && !Unwind)
512 report_fatal_error("Don't know what kind of handler this is!");
513 if (Unwind)
514 CurFrame->HandlesUnwind = true;
515 if (Except)
516 CurFrame->HandlesExceptions = true;
517 }
518
EmitWin64EHHandlerData()519 void MCStreamer::EmitWin64EHHandlerData() {
520 EnsureValidW64UnwindInfo();
521 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
522 if (CurFrame->ChainedParent)
523 report_fatal_error("Chained unwind areas can't have handlers!");
524 }
525
EmitWin64EHPushReg(unsigned Register)526 void MCStreamer::EmitWin64EHPushReg(unsigned Register) {
527 EnsureValidW64UnwindInfo();
528 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
529 MCSymbol *Label = getContext().CreateTempSymbol();
530 MCWin64EHInstruction Inst(Win64EH::UOP_PushNonVol, Label, Register);
531 EmitLabel(Label);
532 CurFrame->Instructions.push_back(Inst);
533 }
534
EmitWin64EHSetFrame(unsigned Register,unsigned Offset)535 void MCStreamer::EmitWin64EHSetFrame(unsigned Register, unsigned Offset) {
536 EnsureValidW64UnwindInfo();
537 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
538 if (CurFrame->LastFrameInst >= 0)
539 report_fatal_error("Frame register and offset already specified!");
540 if (Offset & 0x0F)
541 report_fatal_error("Misaligned frame pointer offset!");
542 MCWin64EHInstruction Inst(Win64EH::UOP_SetFPReg, NULL, Register, Offset);
543 CurFrame->LastFrameInst = CurFrame->Instructions.size();
544 CurFrame->Instructions.push_back(Inst);
545 }
546
EmitWin64EHAllocStack(unsigned Size)547 void MCStreamer::EmitWin64EHAllocStack(unsigned Size) {
548 EnsureValidW64UnwindInfo();
549 if (Size & 7)
550 report_fatal_error("Misaligned stack allocation!");
551 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
552 MCSymbol *Label = getContext().CreateTempSymbol();
553 MCWin64EHInstruction Inst(Label, Size);
554 EmitLabel(Label);
555 CurFrame->Instructions.push_back(Inst);
556 }
557
EmitWin64EHSaveReg(unsigned Register,unsigned Offset)558 void MCStreamer::EmitWin64EHSaveReg(unsigned Register, unsigned Offset) {
559 EnsureValidW64UnwindInfo();
560 if (Offset & 7)
561 report_fatal_error("Misaligned saved register offset!");
562 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
563 MCSymbol *Label = getContext().CreateTempSymbol();
564 MCWin64EHInstruction Inst(
565 Offset > 512*1024-8 ? Win64EH::UOP_SaveNonVolBig : Win64EH::UOP_SaveNonVol,
566 Label, Register, Offset);
567 EmitLabel(Label);
568 CurFrame->Instructions.push_back(Inst);
569 }
570
EmitWin64EHSaveXMM(unsigned Register,unsigned Offset)571 void MCStreamer::EmitWin64EHSaveXMM(unsigned Register, unsigned Offset) {
572 EnsureValidW64UnwindInfo();
573 if (Offset & 0x0F)
574 report_fatal_error("Misaligned saved vector register offset!");
575 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
576 MCSymbol *Label = getContext().CreateTempSymbol();
577 MCWin64EHInstruction Inst(
578 Offset > 512*1024-16 ? Win64EH::UOP_SaveXMM128Big : Win64EH::UOP_SaveXMM128,
579 Label, Register, Offset);
580 EmitLabel(Label);
581 CurFrame->Instructions.push_back(Inst);
582 }
583
EmitWin64EHPushFrame(bool Code)584 void MCStreamer::EmitWin64EHPushFrame(bool Code) {
585 EnsureValidW64UnwindInfo();
586 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
587 if (CurFrame->Instructions.size() > 0)
588 report_fatal_error("If present, PushMachFrame must be the first UOP");
589 MCSymbol *Label = getContext().CreateTempSymbol();
590 MCWin64EHInstruction Inst(Win64EH::UOP_PushMachFrame, Label, Code);
591 EmitLabel(Label);
592 CurFrame->Instructions.push_back(Inst);
593 }
594
EmitWin64EHEndProlog()595 void MCStreamer::EmitWin64EHEndProlog() {
596 EnsureValidW64UnwindInfo();
597 MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
598 CurFrame->PrologEnd = getContext().CreateTempSymbol();
599 EmitLabel(CurFrame->PrologEnd);
600 }
601
EmitCOFFSecRel32(MCSymbol const * Symbol)602 void MCStreamer::EmitCOFFSecRel32(MCSymbol const *Symbol) {
603 llvm_unreachable("This file format doesn't support this directive");
604 }
605
EmitFnStart()606 void MCStreamer::EmitFnStart() {
607 errs() << "Not implemented yet\n";
608 abort();
609 }
610
EmitFnEnd()611 void MCStreamer::EmitFnEnd() {
612 errs() << "Not implemented yet\n";
613 abort();
614 }
615
EmitCantUnwind()616 void MCStreamer::EmitCantUnwind() {
617 errs() << "Not implemented yet\n";
618 abort();
619 }
620
EmitHandlerData()621 void MCStreamer::EmitHandlerData() {
622 errs() << "Not implemented yet\n";
623 abort();
624 }
625
EmitPersonality(const MCSymbol * Personality)626 void MCStreamer::EmitPersonality(const MCSymbol *Personality) {
627 errs() << "Not implemented yet\n";
628 abort();
629 }
630
EmitSetFP(unsigned FpReg,unsigned SpReg,int64_t Offset)631 void MCStreamer::EmitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset) {
632 errs() << "Not implemented yet\n";
633 abort();
634 }
635
EmitPad(int64_t Offset)636 void MCStreamer::EmitPad(int64_t Offset) {
637 errs() << "Not implemented yet\n";
638 abort();
639 }
640
EmitRegSave(const SmallVectorImpl<unsigned> & RegList,bool)641 void MCStreamer::EmitRegSave(const SmallVectorImpl<unsigned> &RegList, bool) {
642 errs() << "Not implemented yet\n";
643 abort();
644 }
645
646 /// EmitRawText - If this file is backed by an assembly streamer, this dumps
647 /// the specified string in the output .s file. This capability is
648 /// indicated by the hasRawTextSupport() predicate.
EmitRawText(StringRef String)649 void MCStreamer::EmitRawText(StringRef String) {
650 errs() << "EmitRawText called on an MCStreamer that doesn't support it, "
651 " something must not be fully mc'ized\n";
652 abort();
653 }
654
EmitRawText(const Twine & T)655 void MCStreamer::EmitRawText(const Twine &T) {
656 SmallString<128> Str;
657 T.toVector(Str);
658 EmitRawText(Str.str());
659 }
660
EmitFrames(bool usingCFI)661 void MCStreamer::EmitFrames(bool usingCFI) {
662 if (!getNumFrameInfos())
663 return;
664
665 if (EmitEHFrame)
666 MCDwarfFrameEmitter::Emit(*this, usingCFI, true);
667
668 if (EmitDebugFrame)
669 MCDwarfFrameEmitter::Emit(*this, usingCFI, false);
670 }
671
EmitW64Tables()672 void MCStreamer::EmitW64Tables() {
673 if (!getNumW64UnwindInfos())
674 return;
675
676 MCWin64EHUnwindEmitter::Emit(*this);
677 }
678
Finish()679 void MCStreamer::Finish() {
680 if (!FrameInfos.empty() && !FrameInfos.back().End)
681 report_fatal_error("Unfinished frame!");
682
683 FinishImpl();
684 }
685