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MCWin64EH.cpp
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1 //===- lib/MC/MCWin64EH.cpp - MCWin64EH implementation --------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #include "llvm/MC/MCWin64EH.h"
10 #include "llvm/ADT/Twine.h"
11 #include "llvm/MC/MCContext.h"
12 #include "llvm/MC/MCExpr.h"
15 #include "llvm/MC/MCSectionCOFF.h"
16 #include "llvm/MC/MCStreamer.h"
17 #include "llvm/MC/MCSymbol.h"
18 #include "llvm/Support/Win64EH.h"
19 
20 using namespace llvm;
21 
22 // NOTE: All relocations generated here are 4-byte image-relative.
23 
24 static uint8_t CountOfUnwindCodes(std::vector<WinEH::Instruction> &Insns) {
25  uint8_t Count = 0;
26  for (const auto &I : Insns) {
27  switch (static_cast<Win64EH::UnwindOpcodes>(I.Operation)) {
28  default:
29  llvm_unreachable("Unsupported unwind code");
34  Count += 1;
35  break;
38  Count += 2;
39  break;
42  Count += 3;
43  break;
45  Count += (I.Offset > 512 * 1024 - 8) ? 3 : 2;
46  break;
47  }
48  }
49  return Count;
50 }
51 
52 static void EmitAbsDifference(MCStreamer &Streamer, const MCSymbol *LHS,
53  const MCSymbol *RHS) {
54  MCContext &Context = Streamer.getContext();
55  const MCExpr *Diff =
57  MCSymbolRefExpr::create(RHS, Context), Context);
58  Streamer.EmitValue(Diff, 1);
59 }
60 
61 static void EmitUnwindCode(MCStreamer &streamer, const MCSymbol *begin,
62  WinEH::Instruction &inst) {
63  uint8_t b2;
64  uint16_t w;
65  b2 = (inst.Operation & 0x0F);
66  switch (static_cast<Win64EH::UnwindOpcodes>(inst.Operation)) {
67  default:
68  llvm_unreachable("Unsupported unwind code");
70  EmitAbsDifference(streamer, inst.Label, begin);
71  b2 |= (inst.Register & 0x0F) << 4;
72  streamer.EmitIntValue(b2, 1);
73  break;
75  EmitAbsDifference(streamer, inst.Label, begin);
76  if (inst.Offset > 512 * 1024 - 8) {
77  b2 |= 0x10;
78  streamer.EmitIntValue(b2, 1);
79  w = inst.Offset & 0xFFF8;
80  streamer.EmitIntValue(w, 2);
81  w = inst.Offset >> 16;
82  } else {
83  streamer.EmitIntValue(b2, 1);
84  w = inst.Offset >> 3;
85  }
86  streamer.EmitIntValue(w, 2);
87  break;
89  b2 |= (((inst.Offset - 8) >> 3) & 0x0F) << 4;
90  EmitAbsDifference(streamer, inst.Label, begin);
91  streamer.EmitIntValue(b2, 1);
92  break;
94  EmitAbsDifference(streamer, inst.Label, begin);
95  streamer.EmitIntValue(b2, 1);
96  break;
99  b2 |= (inst.Register & 0x0F) << 4;
100  EmitAbsDifference(streamer, inst.Label, begin);
101  streamer.EmitIntValue(b2, 1);
102  w = inst.Offset >> 3;
104  w >>= 1;
105  streamer.EmitIntValue(w, 2);
106  break;
109  b2 |= (inst.Register & 0x0F) << 4;
110  EmitAbsDifference(streamer, inst.Label, begin);
111  streamer.EmitIntValue(b2, 1);
113  w = inst.Offset & 0xFFF0;
114  else
115  w = inst.Offset & 0xFFF8;
116  streamer.EmitIntValue(w, 2);
117  w = inst.Offset >> 16;
118  streamer.EmitIntValue(w, 2);
119  break;
121  if (inst.Offset == 1)
122  b2 |= 0x10;
123  EmitAbsDifference(streamer, inst.Label, begin);
124  streamer.EmitIntValue(b2, 1);
125  break;
126  }
127 }
128 
129 static void EmitSymbolRefWithOfs(MCStreamer &streamer,
130  const MCSymbol *Base,
131  const MCSymbol *Other) {
132  MCContext &Context = streamer.getContext();
133  const MCSymbolRefExpr *BaseRef = MCSymbolRefExpr::create(Base, Context);
134  const MCSymbolRefExpr *OtherRef = MCSymbolRefExpr::create(Other, Context);
135  const MCExpr *Ofs = MCBinaryExpr::createSub(OtherRef, BaseRef, Context);
136  const MCSymbolRefExpr *BaseRefRel = MCSymbolRefExpr::create(Base,
138  Context);
139  streamer.EmitValue(MCBinaryExpr::createAdd(BaseRefRel, Ofs, Context), 4);
140 }
141 
142 static void EmitRuntimeFunction(MCStreamer &streamer,
143  const WinEH::FrameInfo *info) {
144  MCContext &context = streamer.getContext();
145 
146  streamer.EmitValueToAlignment(4);
147  EmitSymbolRefWithOfs(streamer, info->Function, info->Begin);
148  EmitSymbolRefWithOfs(streamer, info->Function, info->End);
151  context), 4);
152 }
153 
154 static void EmitUnwindInfo(MCStreamer &streamer, WinEH::FrameInfo *info) {
155  // If this UNWIND_INFO already has a symbol, it's already been emitted.
156  if (info->Symbol)
157  return;
158 
159  MCContext &context = streamer.getContext();
160  MCSymbol *Label = context.createTempSymbol();
161 
162  streamer.EmitValueToAlignment(4);
163  streamer.EmitLabel(Label);
164  info->Symbol = Label;
165 
166  // Upper 3 bits are the version number (currently 1).
167  uint8_t flags = 0x01;
168  if (info->ChainedParent)
169  flags |= Win64EH::UNW_ChainInfo << 3;
170  else {
171  if (info->HandlesUnwind)
172  flags |= Win64EH::UNW_TerminateHandler << 3;
173  if (info->HandlesExceptions)
174  flags |= Win64EH::UNW_ExceptionHandler << 3;
175  }
176  streamer.EmitIntValue(flags, 1);
177 
178  if (info->PrologEnd)
179  EmitAbsDifference(streamer, info->PrologEnd, info->Begin);
180  else
181  streamer.EmitIntValue(0, 1);
182 
183  uint8_t numCodes = CountOfUnwindCodes(info->Instructions);
184  streamer.EmitIntValue(numCodes, 1);
185 
186  uint8_t frame = 0;
187  if (info->LastFrameInst >= 0) {
188  WinEH::Instruction &frameInst = info->Instructions[info->LastFrameInst];
189  assert(frameInst.Operation == Win64EH::UOP_SetFPReg);
190  frame = (frameInst.Register & 0x0F) | (frameInst.Offset & 0xF0);
191  }
192  streamer.EmitIntValue(frame, 1);
193 
194  // Emit unwind instructions (in reverse order).
195  uint8_t numInst = info->Instructions.size();
196  for (uint8_t c = 0; c < numInst; ++c) {
197  WinEH::Instruction inst = info->Instructions.back();
198  info->Instructions.pop_back();
199  EmitUnwindCode(streamer, info->Begin, inst);
200  }
201 
202  // For alignment purposes, the instruction array will always have an even
203  // number of entries, with the final entry potentially unused (in which case
204  // the array will be one longer than indicated by the count of unwind codes
205  // field).
206  if (numCodes & 1) {
207  streamer.EmitIntValue(0, 2);
208  }
209 
210  if (flags & (Win64EH::UNW_ChainInfo << 3))
211  EmitRuntimeFunction(streamer, info->ChainedParent);
212  else if (flags &
216  context), 4);
217  else if (numCodes == 0) {
218  // The minimum size of an UNWIND_INFO struct is 8 bytes. If we're not
219  // a chained unwind info, if there is no handler, and if there are fewer
220  // than 2 slots used in the unwind code array, we have to pad to 8 bytes.
221  streamer.EmitIntValue(0, 4);
222  }
223 }
224 
226  // Emit the unwind info structs first.
227  for (const auto &CFI : Streamer.getWinFrameInfos()) {
228  MCSection *XData = Streamer.getAssociatedXDataSection(CFI->TextSection);
229  Streamer.SwitchSection(XData);
230  ::EmitUnwindInfo(Streamer, CFI.get());
231  }
232 
233  // Now emit RUNTIME_FUNCTION entries.
234  for (const auto &CFI : Streamer.getWinFrameInfos()) {
235  MCSection *PData = Streamer.getAssociatedPDataSection(CFI->TextSection);
236  Streamer.SwitchSection(PData);
237  EmitRuntimeFunction(Streamer, CFI.get());
238  }
239 }
240 
242  MCStreamer &Streamer, WinEH::FrameInfo *info) const {
243  // Switch sections (the static function above is meant to be called from
244  // here and from Emit().
245  MCSection *XData = Streamer.getAssociatedXDataSection(info->TextSection);
246  Streamer.SwitchSection(XData);
247 
248  ::EmitUnwindInfo(Streamer, info);
249 }
250 
251 static int64_t GetAbsDifference(MCStreamer &Streamer, const MCSymbol *LHS,
252  const MCSymbol *RHS) {
253  MCContext &Context = Streamer.getContext();
254  const MCExpr *Diff =
256  MCSymbolRefExpr::create(RHS, Context), Context);
257  MCObjectStreamer *OS = (MCObjectStreamer *)(&Streamer);
258  int64_t value;
259  Diff->evaluateAsAbsolute(value, OS->getAssembler());
260  return value;
261 }
262 
263 static uint32_t
264 ARM64CountOfUnwindCodes(const std::vector<WinEH::Instruction> &Insns) {
265  uint32_t Count = 0;
266  for (const auto &I : Insns) {
267  switch (static_cast<Win64EH::UnwindOpcodes>(I.Operation)) {
268  default:
269  llvm_unreachable("Unsupported ARM64 unwind code");
271  Count += 1;
272  break;
274  Count += 2;
275  break;
277  Count += 4;
278  break;
280  Count += 1;
281  break;
283  Count += 1;
284  break;
286  Count += 2;
287  break;
289  Count += 2;
290  break;
292  Count += 2;
293  break;
295  Count += 2;
296  break;
298  Count += 2;
299  break;
301  Count += 2;
302  break;
304  Count += 2;
305  break;
307  Count += 2;
308  break;
309  case Win64EH::UOP_SetFP:
310  Count += 1;
311  break;
312  case Win64EH::UOP_AddFP:
313  Count += 2;
314  break;
315  case Win64EH::UOP_Nop:
316  Count += 1;
317  break;
318  case Win64EH::UOP_End:
319  Count += 1;
320  break;
321  }
322  }
323  return Count;
324 }
325 
326 // Unwind opcode encodings and restrictions are documented at
327 // https://docs.microsoft.com/en-us/cpp/build/arm64-exception-handling
328 static void ARM64EmitUnwindCode(MCStreamer &streamer, const MCSymbol *begin,
329  WinEH::Instruction &inst) {
330  uint8_t b, reg;
331  switch (static_cast<Win64EH::UnwindOpcodes>(inst.Operation)) {
332  default:
333  llvm_unreachable("Unsupported ARM64 unwind code");
335  b = (inst.Offset >> 4) & 0x1F;
336  streamer.EmitIntValue(b, 1);
337  break;
339  uint16_t hw = (inst.Offset >> 4) & 0x7FF;
340  b = 0xC0;
341  b |= (hw >> 8);
342  streamer.EmitIntValue(b, 1);
343  b = hw & 0xFF;
344  streamer.EmitIntValue(b, 1);
345  break;
346  }
348  uint32_t w;
349  b = 0xE0;
350  streamer.EmitIntValue(b, 1);
351  w = inst.Offset >> 4;
352  b = (w & 0x00FF0000) >> 16;
353  streamer.EmitIntValue(b, 1);
354  b = (w & 0x0000FF00) >> 8;
355  streamer.EmitIntValue(b, 1);
356  b = w & 0x000000FF;
357  streamer.EmitIntValue(b, 1);
358  break;
359  }
360  case Win64EH::UOP_SetFP:
361  b = 0xE1;
362  streamer.EmitIntValue(b, 1);
363  break;
364  case Win64EH::UOP_AddFP:
365  b = 0xE2;
366  streamer.EmitIntValue(b, 1);
367  b = (inst.Offset >> 3);
368  streamer.EmitIntValue(b, 1);
369  break;
370  case Win64EH::UOP_Nop:
371  b = 0xE3;
372  streamer.EmitIntValue(b, 1);
373  break;
375  b = 0x80;
376  b |= ((inst.Offset - 1) >> 3) & 0x3F;
377  streamer.EmitIntValue(b, 1);
378  break;
380  b = 0x40;
381  b |= (inst.Offset >> 3) & 0x3F;
382  streamer.EmitIntValue(b, 1);
383  break;
385  assert(inst.Register >= 19 && "Saved reg must be >= 19");
386  reg = inst.Register - 19;
387  b = 0xD0 | ((reg & 0xC) >> 2);
388  streamer.EmitIntValue(b, 1);
389  b = ((reg & 0x3) << 6) | (inst.Offset >> 3);
390  streamer.EmitIntValue(b, 1);
391  break;
393  assert(inst.Register >= 19 && "Saved reg must be >= 19");
394  reg = inst.Register - 19;
395  b = 0xD4 | ((reg & 0x8) >> 3);
396  streamer.EmitIntValue(b, 1);
397  b = ((reg & 0x7) << 5) | ((inst.Offset >> 3) - 1);
398  streamer.EmitIntValue(b, 1);
399  break;
401  assert(inst.Register >= 19 && "Saved registers must be >= 19");
402  reg = inst.Register - 19;
403  b = 0xC8 | ((reg & 0xC) >> 2);
404  streamer.EmitIntValue(b, 1);
405  b = ((reg & 0x3) << 6) | (inst.Offset >> 3);
406  streamer.EmitIntValue(b, 1);
407  break;
409  assert(inst.Register >= 19 && "Saved registers must be >= 19");
410  reg = inst.Register - 19;
411  b = 0xCC | ((reg & 0xC) >> 2);
412  streamer.EmitIntValue(b, 1);
413  b = ((reg & 0x3) << 6) | ((inst.Offset >> 3) - 1);
414  streamer.EmitIntValue(b, 1);
415  break;
417  assert(inst.Register >= 8 && "Saved dreg must be >= 8");
418  reg = inst.Register - 8;
419  b = 0xDC | ((reg & 0x4) >> 2);
420  streamer.EmitIntValue(b, 1);
421  b = ((reg & 0x3) << 6) | (inst.Offset >> 3);
422  streamer.EmitIntValue(b, 1);
423  break;
425  assert(inst.Register >= 8 && "Saved dreg must be >= 8");
426  reg = inst.Register - 8;
427  b = 0xDE;
428  streamer.EmitIntValue(b, 1);
429  b = ((reg & 0x7) << 5) | ((inst.Offset >> 3) - 1);
430  streamer.EmitIntValue(b, 1);
431  break;
433  assert(inst.Register >= 8 && "Saved dregs must be >= 8");
434  reg = inst.Register - 8;
435  b = 0xD8 | ((reg & 0x4) >> 2);
436  streamer.EmitIntValue(b, 1);
437  b = ((reg & 0x3) << 6) | (inst.Offset >> 3);
438  streamer.EmitIntValue(b, 1);
439  break;
441  assert(inst.Register >= 8 && "Saved dregs must be >= 8");
442  reg = inst.Register - 8;
443  b = 0xDA | ((reg & 0x4) >> 2);
444  streamer.EmitIntValue(b, 1);
445  b = ((reg & 0x3) << 6) | ((inst.Offset >> 3) - 1);
446  streamer.EmitIntValue(b, 1);
447  break;
448  case Win64EH::UOP_End:
449  b = 0xE4;
450  streamer.EmitIntValue(b, 1);
451  break;
452  }
453 }
454 
455 // Returns the epilog symbol of an epilog with the exact same unwind code
456 // sequence, if it exists. Otherwise, returns nulltpr.
457 // EpilogInstrs - Unwind codes for the current epilog.
458 // Epilogs - Epilogs that potentialy match the current epilog.
459 static MCSymbol*
460 FindMatchingEpilog(const std::vector<WinEH::Instruction>& EpilogInstrs,
461  const std::vector<MCSymbol *>& Epilogs,
462  const WinEH::FrameInfo *info) {
463  for (auto *EpilogStart : Epilogs) {
464  auto InstrsIter = info->EpilogMap.find(EpilogStart);
465  assert(InstrsIter != info->EpilogMap.end() &&
466  "Epilog not found in EpilogMap");
467  const auto &Instrs = InstrsIter->second;
468 
469  if (Instrs.size() != EpilogInstrs.size())
470  continue;
471 
472  bool Match = true;
473  for (unsigned i = 0; i < Instrs.size(); ++i)
474  if (Instrs[i].Operation != EpilogInstrs[i].Operation ||
475  Instrs[i].Offset != EpilogInstrs[i].Offset ||
476  Instrs[i].Register != EpilogInstrs[i].Register) {
477  Match = false;
478  break;
479  }
480 
481  if (Match)
482  return EpilogStart;
483  }
484  return nullptr;
485 }
486 
487 // Populate the .xdata section. The format of .xdata on ARM64 is documented at
488 // https://docs.microsoft.com/en-us/cpp/build/arm64-exception-handling
490  // If this UNWIND_INFO already has a symbol, it's already been emitted.
491  if (info->Symbol)
492  return;
493 
494  MCContext &context = streamer.getContext();
495  MCSymbol *Label = context.createTempSymbol();
496 
497  streamer.EmitValueToAlignment(4);
498  streamer.EmitLabel(Label);
499  info->Symbol = Label;
500 
501  uint32_t FuncLength = 0x0;
502  if (info->FuncletOrFuncEnd)
503  FuncLength = (uint32_t)GetAbsDifference(streamer, info->FuncletOrFuncEnd,
504  info->Begin);
505  FuncLength /= 4;
506  uint32_t PrologCodeBytes = ARM64CountOfUnwindCodes(info->Instructions);
507  uint32_t TotalCodeBytes = PrologCodeBytes;
508 
509  // Process epilogs.
511  // Epilogs processed so far.
512  std::vector<MCSymbol *> AddedEpilogs;
513 
514  for (auto &I : info->EpilogMap) {
515  MCSymbol *EpilogStart = I.first;
516  auto &EpilogInstrs = I.second;
517  uint32_t CodeBytes = ARM64CountOfUnwindCodes(EpilogInstrs);
518 
519  MCSymbol* MatchingEpilog =
520  FindMatchingEpilog(EpilogInstrs, AddedEpilogs, info);
521  if (MatchingEpilog) {
522  assert(EpilogInfo.find(MatchingEpilog) != EpilogInfo.end() &&
523  "Duplicate epilog not found");
524  EpilogInfo[EpilogStart] = EpilogInfo.lookup(MatchingEpilog);
525  // Clear the unwind codes in the EpilogMap, so that they don't get output
526  // in the logic below.
527  EpilogInstrs.clear();
528  } else {
529  EpilogInfo[EpilogStart] = TotalCodeBytes;
530  TotalCodeBytes += CodeBytes;
531  AddedEpilogs.push_back(EpilogStart);
532  }
533  }
534 
535  // Code Words, Epilog count, E, X, Vers, Function Length
536  uint32_t row1 = 0x0;
537  uint32_t CodeWords = TotalCodeBytes / 4;
538  uint32_t CodeWordsMod = TotalCodeBytes % 4;
539  if (CodeWordsMod)
540  CodeWords++;
541  uint32_t EpilogCount = info->EpilogMap.size();
542  bool ExtensionWord = EpilogCount > 31 || TotalCodeBytes > 124;
543  if (!ExtensionWord) {
544  row1 |= (EpilogCount & 0x1F) << 22;
545  row1 |= (CodeWords & 0x1F) << 27;
546  }
547  // E is always 0 right now, TODO: packed epilog setup
548  if (info->HandlesExceptions) // X
549  row1 |= 1 << 20;
550  row1 |= FuncLength & 0x3FFFF;
551  streamer.EmitIntValue(row1, 4);
552 
553  // Extended Code Words, Extended Epilog Count
554  if (ExtensionWord) {
555  // FIXME: We should be able to split unwind info into multiple sections.
556  // FIXME: We should share epilog codes across epilogs, where possible,
557  // which would make this issue show up less frequently.
558  if (CodeWords > 0xFF || EpilogCount > 0xFFFF)
559  report_fatal_error("SEH unwind data splitting not yet implemented");
560  uint32_t row2 = 0x0;
561  row2 |= (CodeWords & 0xFF) << 16;
562  row2 |= (EpilogCount & 0xFFFF);
563  streamer.EmitIntValue(row2, 4);
564  }
565 
566  // Epilog Start Index, Epilog Start Offset
567  for (auto &I : EpilogInfo) {
568  MCSymbol *EpilogStart = I.first;
569  uint32_t EpilogIndex = I.second;
570  uint32_t EpilogOffset =
571  (uint32_t)GetAbsDifference(streamer, EpilogStart, info->Begin);
572  if (EpilogOffset)
573  EpilogOffset /= 4;
574  uint32_t row3 = EpilogOffset;
575  row3 |= (EpilogIndex & 0x3FF) << 22;
576  streamer.EmitIntValue(row3, 4);
577  }
578 
579  // Emit prolog unwind instructions (in reverse order).
580  uint8_t numInst = info->Instructions.size();
581  for (uint8_t c = 0; c < numInst; ++c) {
582  WinEH::Instruction inst = info->Instructions.back();
583  info->Instructions.pop_back();
584  ARM64EmitUnwindCode(streamer, info->Begin, inst);
585  }
586 
587  // Emit epilog unwind instructions
588  for (auto &I : info->EpilogMap) {
589  auto &EpilogInstrs = I.second;
590  for (uint32_t i = 0; i < EpilogInstrs.size(); i++) {
591  WinEH::Instruction inst = EpilogInstrs[i];
592  ARM64EmitUnwindCode(streamer, info->Begin, inst);
593  }
594  }
595 
596  int32_t BytesMod = CodeWords * 4 - TotalCodeBytes;
597  assert(BytesMod >= 0);
598  for (int i = 0; i < BytesMod; i++)
599  streamer.EmitIntValue(0xE3, 1);
600 
601  if (info->HandlesExceptions)
602  streamer.EmitValue(
605  4);
606 }
607 
608 static void ARM64EmitRuntimeFunction(MCStreamer &streamer,
609  const WinEH::FrameInfo *info) {
610  MCContext &context = streamer.getContext();
611 
612  streamer.EmitValueToAlignment(4);
613  EmitSymbolRefWithOfs(streamer, info->Function, info->Begin);
616  context),
617  4);
618 }
619 
621  // Emit the unwind info structs first.
622  for (const auto &CFI : Streamer.getWinFrameInfos()) {
623  MCSection *XData = Streamer.getAssociatedXDataSection(CFI->TextSection);
624  Streamer.SwitchSection(XData);
625  ARM64EmitUnwindInfo(Streamer, CFI.get());
626  }
627 
628  // Now emit RUNTIME_FUNCTION entries.
629  for (const auto &CFI : Streamer.getWinFrameInfos()) {
630  MCSection *PData = Streamer.getAssociatedPDataSection(CFI->TextSection);
631  Streamer.SwitchSection(PData);
632  ARM64EmitRuntimeFunction(Streamer, CFI.get());
633  }
634 }
635 
637  MCStreamer &Streamer, WinEH::FrameInfo *info) const {
638  // Switch sections (the static function above is meant to be called from
639  // here and from Emit().
640  MCSection *XData = Streamer.getAssociatedXDataSection(info->TextSection);
641  Streamer.SwitchSection(XData);
642  ARM64EmitUnwindInfo(Streamer, info);
643 }
Instances of this class represent a uniqued identifier for a section in the current translation unit...
Definition: MCSection.h:38
UNW_TerminateHandler - Specifies that this function has a termination handler.
Definition: Win64EH.h:78
LLVMContext & Context
const_iterator begin(StringRef path, Style style=Style::native)
Get begin iterator over path.
Definition: Path.cpp:224
static const MCSymbolRefExpr * create(const MCSymbol *Symbol, MCContext &Ctx)
Definition: MCExpr.h:319
LLVM_ATTRIBUTE_NORETURN void report_fatal_error(Error Err, bool gen_crash_diag=true)
Report a serious error, calling any installed error handler.
Definition: Error.cpp:139
This class represents lattice values for constants.
Definition: AllocatorList.h:23
MCSymbol - Instances of this class represent a symbol name in the MC file, and MCSymbols are created ...
Definition: MCSymbol.h:41
static void ARM64EmitRuntimeFunction(MCStreamer &streamer, const WinEH::FrameInfo *info)
Definition: MCWin64EH.cpp:608
const MCSymbol * End
Definition: MCWinEH.h:33
static void EmitUnwindCode(MCStreamer &streamer, const MCSymbol *begin, WinEH::Instruction &inst)
Definition: MCWin64EH.cpp:61
This class implements a map that also provides access to all stored values in a deterministic order...
Definition: MapVector.h:37
std::vector< Instruction > Instructions
Definition: MCWinEH.h:46
static void ARM64EmitUnwindInfo(MCStreamer &streamer, WinEH::FrameInfo *info)
Definition: MCWin64EH.cpp:489
MCContext & getContext() const
Definition: MCStreamer.h:250
UNW_ChainInfo - Specifies that this UnwindInfo structure is chained to another one.
Definition: Win64EH.h:81
Base class for the full range of assembler expressions which are needed for parsing.
Definition: MCExpr.h:35
Represent a reference to a symbol from inside an expression.
Definition: MCExpr.h:165
static void EmitAbsDifference(MCStreamer &Streamer, const MCSymbol *LHS, const MCSymbol *RHS)
Definition: MCWin64EH.cpp:52
ArrayRef< std::unique_ptr< WinEH::FrameInfo > > getWinFrameInfos() const
Definition: MCStreamer.h:277
Context object for machine code objects.
Definition: MCContext.h:62
static const MCBinaryExpr * createSub(const MCExpr *LHS, const MCExpr *RHS, MCContext &Ctx)
Definition: MCExpr.h:542
Streaming object file generation interface.
static const MCBinaryExpr * createAdd(const MCExpr *LHS, const MCExpr *RHS, MCContext &Ctx)
Definition: MCExpr.h:457
iterator find(const KeyT &Key)
Definition: MapVector.h:147
virtual void EmitIntValue(uint64_t Value, unsigned Size)
Special case of EmitValue that avoids the client having to pass in a MCExpr for constant integers...
Definition: MCStreamer.cpp:123
void EmitValue(const MCExpr *Value, unsigned Size, SMLoc Loc=SMLoc())
Definition: MCStreamer.cpp:154
static uint32_t ARM64CountOfUnwindCodes(const std::vector< WinEH::Instruction > &Insns)
Definition: MCWin64EH.cpp:264
static void EmitSymbolRefWithOfs(MCStreamer &streamer, const MCSymbol *Base, const MCSymbol *Other)
Definition: MCWin64EH.cpp:129
Streaming machine code generation interface.
Definition: MCStreamer.h:188
MCSymbol * createTempSymbol(bool CanBeUnnamed=true)
Create and return a new assembler temporary symbol with a unique but unspecified name.
Definition: MCContext.cpp:220
const FrameInfo * ChainedParent
Definition: MCWinEH.h:45
static void EmitRuntimeFunction(MCStreamer &streamer, const WinEH::FrameInfo *info)
Definition: MCWin64EH.cpp:142
PowerPC Reduce CR logical Operation
virtual void SwitchSection(MCSection *Section, const MCExpr *Subsection=nullptr)
Set the current section where code is being emitted to Section.
MCAssembler & getAssembler()
MCSection * getAssociatedPDataSection(const MCSection *TextSec)
Get the .pdata section used for the given section.
Definition: MCStreamer.cpp:747
virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value=0, unsigned ValueSize=1, unsigned MaxBytesToEmit=0)
Emit some number of copies of Value until the byte alignment ByteAlignment is reached.
void EmitUnwindInfo(MCStreamer &Streamer, WinEH::FrameInfo *FI) const override
Definition: MCWin64EH.cpp:241
const MCSymbol * Symbol
Definition: MCWinEH.h:38
UNW_ExceptionHandler - Specifies that this function has an exception handler.
Definition: Win64EH.h:75
lazy value info
const MCSymbol * Begin
Definition: MCWinEH.h:32
#define llvm_unreachable(msg)
Marks that the current location is not supposed to be reachable.
const MCSymbol * PrologEnd
Definition: MCWinEH.h:37
const MCSection * TextSection
Definition: MCWinEH.h:39
const MCSymbol * Label
Definition: MCWinEH.h:22
void Emit(MCStreamer &Streamer) const override
This emits the unwind info sections (.pdata and .xdata in PE/COFF).
Definition: MCWin64EH.cpp:620
Promote Memory to Register
Definition: Mem2Reg.cpp:109
MapVector< MCSymbol *, std::vector< Instruction > > EpilogMap
Definition: MCWinEH.h:47
const MCSymbol * Function
Definition: MCWinEH.h:36
ValueT lookup(const KeyT &Key) const
Definition: MapVector.h:110
static MCSymbol * FindMatchingEpilog(const std::vector< WinEH::Instruction > &EpilogInstrs, const std::vector< MCSymbol *> &Epilogs, const WinEH::FrameInfo *info)
Definition: MCWin64EH.cpp:460
const MCSymbol * FuncletOrFuncEnd
Definition: MCWinEH.h:34
#define I(x, y, z)
Definition: MD5.cpp:58
static uint8_t CountOfUnwindCodes(std::vector< WinEH::Instruction > &Insns)
Definition: MCWin64EH.cpp:24
iterator end()
Definition: MapVector.h:71
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())
static int64_t GetAbsDifference(MCStreamer &Streamer, const MCSymbol *LHS, const MCSymbol *RHS)
Definition: MCWin64EH.cpp:251
static void ARM64EmitUnwindCode(MCStreamer &streamer, const MCSymbol *begin, WinEH::Instruction &inst)
Definition: MCWin64EH.cpp:328
void EmitUnwindInfo(MCStreamer &Streamer, WinEH::FrameInfo *FI) const override
Definition: MCWin64EH.cpp:636
virtual void EmitLabel(MCSymbol *Symbol, SMLoc Loc=SMLoc())
Emit a label for Symbol into the current section.
Definition: MCStreamer.cpp:346
static void EmitUnwindInfo(MCStreamer &streamer, WinEH::FrameInfo *info)
Definition: MCWin64EH.cpp:154
const MCSymbol * ExceptionHandler
Definition: MCWinEH.h:35
void Emit(MCStreamer &Streamer) const override
This emits the unwind info sections (.pdata and .xdata in PE/COFF).
Definition: MCWin64EH.cpp:225
MCSection * getAssociatedXDataSection(const MCSection *TextSec)
Get the .xdata section used for the given section.
Definition: MCStreamer.cpp:753