LLVM  8.0.0svn
AsmPrinterInlineAsm.cpp
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1 //===-- AsmPrinterInlineAsm.cpp - AsmPrinter Inline Asm Handling ----------===//
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 // This file implements the inline assembler pieces of the AsmPrinter class.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "llvm/ADT/SmallString.h"
15 #include "llvm/ADT/Twine.h"
23 #include "llvm/IR/Constants.h"
24 #include "llvm/IR/DataLayout.h"
25 #include "llvm/IR/InlineAsm.h"
26 #include "llvm/IR/LLVMContext.h"
27 #include "llvm/IR/Module.h"
28 #include "llvm/MC/MCAsmInfo.h"
30 #include "llvm/MC/MCStreamer.h"
32 #include "llvm/MC/MCSymbol.h"
35 #include "llvm/Support/SourceMgr.h"
39 using namespace llvm;
40 
41 #define DEBUG_TYPE "asm-printer"
42 
43 /// srcMgrDiagHandler - This callback is invoked when the SourceMgr for an
44 /// inline asm has an error in it. diagInfo is a pointer to the SrcMgrDiagInfo
45 /// struct above.
46 static void srcMgrDiagHandler(const SMDiagnostic &Diag, void *diagInfo) {
47  AsmPrinter::SrcMgrDiagInfo *DiagInfo =
48  static_cast<AsmPrinter::SrcMgrDiagInfo *>(diagInfo);
49  assert(DiagInfo && "Diagnostic context not passed down?");
50 
51  // Look up a LocInfo for the buffer this diagnostic is coming from.
52  unsigned BufNum = DiagInfo->SrcMgr.FindBufferContainingLoc(Diag.getLoc());
53  const MDNode *LocInfo = nullptr;
54  if (BufNum > 0 && BufNum <= DiagInfo->LocInfos.size())
55  LocInfo = DiagInfo->LocInfos[BufNum-1];
56 
57  // If the inline asm had metadata associated with it, pull out a location
58  // cookie corresponding to which line the error occurred on.
59  unsigned LocCookie = 0;
60  if (LocInfo) {
61  unsigned ErrorLine = Diag.getLineNo()-1;
62  if (ErrorLine >= LocInfo->getNumOperands())
63  ErrorLine = 0;
64 
65  if (LocInfo->getNumOperands() != 0)
66  if (const ConstantInt *CI =
67  mdconst::dyn_extract<ConstantInt>(LocInfo->getOperand(ErrorLine)))
68  LocCookie = CI->getZExtValue();
69  }
70 
71  DiagInfo->DiagHandler(Diag, DiagInfo->DiagContext, LocCookie);
72 }
73 
74 unsigned AsmPrinter::addInlineAsmDiagBuffer(StringRef AsmStr,
75  const MDNode *LocMDNode) const {
76  if (!DiagInfo) {
77  DiagInfo = make_unique<SrcMgrDiagInfo>();
78 
80  Context.setInlineSourceManager(&DiagInfo->SrcMgr);
81 
82  LLVMContext &LLVMCtx = MMI->getModule()->getContext();
83  if (LLVMCtx.getInlineAsmDiagnosticHandler()) {
84  DiagInfo->DiagHandler = LLVMCtx.getInlineAsmDiagnosticHandler();
85  DiagInfo->DiagContext = LLVMCtx.getInlineAsmDiagnosticContext();
86  DiagInfo->SrcMgr.setDiagHandler(srcMgrDiagHandler, DiagInfo.get());
87  }
88  }
89 
90  SourceMgr &SrcMgr = DiagInfo->SrcMgr;
91 
92  std::unique_ptr<MemoryBuffer> Buffer;
93  // The inline asm source manager will outlive AsmStr, so make a copy of the
94  // string for SourceMgr to own.
95  Buffer = MemoryBuffer::getMemBufferCopy(AsmStr, "<inline asm>");
96 
97  // Tell SrcMgr about this buffer, it takes ownership of the buffer.
98  unsigned BufNum = SrcMgr.AddNewSourceBuffer(std::move(Buffer), SMLoc());
99 
100  // Store LocMDNode in DiagInfo, using BufNum as an identifier.
101  if (LocMDNode) {
102  DiagInfo->LocInfos.resize(BufNum);
103  DiagInfo->LocInfos[BufNum - 1] = LocMDNode;
104  }
105 
106  return BufNum;
107 }
108 
109 
110 /// EmitInlineAsm - Emit a blob of inline asm to the output streamer.
111 void AsmPrinter::EmitInlineAsm(StringRef Str, const MCSubtargetInfo &STI,
112  const MCTargetOptions &MCOptions,
113  const MDNode *LocMDNode,
114  InlineAsm::AsmDialect Dialect) const {
115  assert(!Str.empty() && "Can't emit empty inline asm block");
116 
117  // Remember if the buffer is nul terminated or not so we can avoid a copy.
118  bool isNullTerminated = Str.back() == 0;
119  if (isNullTerminated)
120  Str = Str.substr(0, Str.size()-1);
121 
122  // If the output streamer does not have mature MC support or the integrated
123  // assembler has been disabled, just emit the blob textually.
124  // Otherwise parse the asm and emit it via MC support.
125  // This is useful in case the asm parser doesn't handle something but the
126  // system assembler does.
127  const MCAsmInfo *MCAI = TM.getMCAsmInfo();
128  assert(MCAI && "No MCAsmInfo");
129  if (!MCAI->useIntegratedAssembler() &&
130  !OutStreamer->isIntegratedAssemblerRequired()) {
132  OutStreamer->EmitRawText(Str);
133  emitInlineAsmEnd(STI, nullptr);
134  return;
135  }
136 
137  unsigned BufNum = addInlineAsmDiagBuffer(Str, LocMDNode);
138  DiagInfo->SrcMgr.setIncludeDirs(MCOptions.IASSearchPaths);
139 
140  std::unique_ptr<MCAsmParser> Parser(createMCAsmParser(
141  DiagInfo->SrcMgr, OutContext, *OutStreamer, *MAI, BufNum));
142 
143  // Do not use assembler-level information for parsing inline assembly.
144  OutStreamer->setUseAssemblerInfoForParsing(false);
145 
146  // We create a new MCInstrInfo here since we might be at the module level
147  // and not have a MachineFunction to initialize the TargetInstrInfo from and
148  // we only need MCInstrInfo for asm parsing. We create one unconditionally
149  // because it's not subtarget dependent.
150  std::unique_ptr<MCInstrInfo> MII(TM.getTarget().createMCInstrInfo());
151  std::unique_ptr<MCTargetAsmParser> TAP(TM.getTarget().createMCAsmParser(
152  STI, *Parser, *MII, MCOptions));
153  if (!TAP)
154  report_fatal_error("Inline asm not supported by this streamer because"
155  " we don't have an asm parser for this target\n");
156  Parser->setAssemblerDialect(Dialect);
157  Parser->setTargetParser(*TAP.get());
158  Parser->setEnablePrintSchedInfo(EnablePrintSchedInfo);
159  if (Dialect == InlineAsm::AD_Intel)
160  // We need this flag to be able to parse numbers like "0bH"
161  Parser->setParsingInlineAsm(true);
162  if (MF) {
164  TAP->SetFrameRegister(TRI->getFrameRegister(*MF));
165  }
166 
168  // Don't implicitly switch to the text section before the asm.
169  int Res = Parser->Run(/*NoInitialTextSection*/ true,
170  /*NoFinalize*/ true);
171  emitInlineAsmEnd(STI, &TAP->getSTI());
172 
173  if (Res && !DiagInfo->DiagHandler)
174  report_fatal_error("Error parsing inline asm\n");
175 }
176 
177 static void EmitMSInlineAsmStr(const char *AsmStr, const MachineInstr *MI,
178  MachineModuleInfo *MMI, int InlineAsmVariant,
179  AsmPrinter *AP, unsigned LocCookie,
180  raw_ostream &OS) {
181  // Switch to the inline assembly variant.
182  OS << "\t.intel_syntax\n\t";
183 
184  const char *LastEmitted = AsmStr; // One past the last character emitted.
185  unsigned NumOperands = MI->getNumOperands();
186 
187  while (*LastEmitted) {
188  switch (*LastEmitted) {
189  default: {
190  // Not a special case, emit the string section literally.
191  const char *LiteralEnd = LastEmitted+1;
192  while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
193  *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
194  ++LiteralEnd;
195 
196  OS.write(LastEmitted, LiteralEnd-LastEmitted);
197  LastEmitted = LiteralEnd;
198  break;
199  }
200  case '\n':
201  ++LastEmitted; // Consume newline character.
202  OS << '\n'; // Indent code with newline.
203  break;
204  case '$': {
205  ++LastEmitted; // Consume '$' character.
206  bool Done = true;
207 
208  // Handle escapes.
209  switch (*LastEmitted) {
210  default: Done = false; break;
211  case '$':
212  ++LastEmitted; // Consume second '$' character.
213  break;
214  }
215  if (Done) break;
216 
217  // If we have ${:foo}, then this is not a real operand reference, it is a
218  // "magic" string reference, just like in .td files. Arrange to call
219  // PrintSpecial.
220  if (LastEmitted[0] == '{' && LastEmitted[1] == ':') {
221  LastEmitted += 2;
222  const char *StrStart = LastEmitted;
223  const char *StrEnd = strchr(StrStart, '}');
224  if (!StrEnd)
225  report_fatal_error("Unterminated ${:foo} operand in inline asm"
226  " string: '" + Twine(AsmStr) + "'");
227 
228  std::string Val(StrStart, StrEnd);
229  AP->PrintSpecial(MI, OS, Val.c_str());
230  LastEmitted = StrEnd+1;
231  break;
232  }
233 
234  const char *IDStart = LastEmitted;
235  const char *IDEnd = IDStart;
236  while (*IDEnd >= '0' && *IDEnd <= '9') ++IDEnd;
237 
238  unsigned Val;
239  if (StringRef(IDStart, IDEnd-IDStart).getAsInteger(10, Val))
240  report_fatal_error("Bad $ operand number in inline asm string: '" +
241  Twine(AsmStr) + "'");
242  LastEmitted = IDEnd;
243 
244  if (Val >= NumOperands-1)
245  report_fatal_error("Invalid $ operand number in inline asm string: '" +
246  Twine(AsmStr) + "'");
247 
248  // Okay, we finally have a value number. Ask the target to print this
249  // operand!
250  unsigned OpNo = InlineAsm::MIOp_FirstOperand;
251 
252  bool Error = false;
253 
254  // Scan to find the machine operand number for the operand.
255  for (; Val; --Val) {
256  if (OpNo >= MI->getNumOperands()) break;
257  unsigned OpFlags = MI->getOperand(OpNo).getImm();
258  OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1;
259  }
260 
261  // We may have a location metadata attached to the end of the
262  // instruction, and at no point should see metadata at any
263  // other point while processing. It's an error if so.
264  if (OpNo >= MI->getNumOperands() ||
265  MI->getOperand(OpNo).isMetadata()) {
266  Error = true;
267  } else {
268  unsigned OpFlags = MI->getOperand(OpNo).getImm();
269  ++OpNo; // Skip over the ID number.
270 
271  if (InlineAsm::isMemKind(OpFlags)) {
272  Error = AP->PrintAsmMemoryOperand(MI, OpNo, InlineAsmVariant,
273  /*Modifier*/ nullptr, OS);
274  } else {
275  Error = AP->PrintAsmOperand(MI, OpNo, InlineAsmVariant,
276  /*Modifier*/ nullptr, OS);
277  }
278  }
279  if (Error) {
280  std::string msg;
281  raw_string_ostream Msg(msg);
282  Msg << "invalid operand in inline asm: '" << AsmStr << "'";
283  MMI->getModule()->getContext().emitError(LocCookie, Msg.str());
284  }
285  break;
286  }
287  }
288  }
289  OS << "\n\t.att_syntax\n" << (char)0; // null terminate string.
290 }
291 
292 static void EmitGCCInlineAsmStr(const char *AsmStr, const MachineInstr *MI,
293  MachineModuleInfo *MMI, int InlineAsmVariant,
294  int AsmPrinterVariant, AsmPrinter *AP,
295  unsigned LocCookie, raw_ostream &OS) {
296  int CurVariant = -1; // The number of the {.|.|.} region we are in.
297  const char *LastEmitted = AsmStr; // One past the last character emitted.
298  unsigned NumOperands = MI->getNumOperands();
299 
300  OS << '\t';
301 
302  while (*LastEmitted) {
303  switch (*LastEmitted) {
304  default: {
305  // Not a special case, emit the string section literally.
306  const char *LiteralEnd = LastEmitted+1;
307  while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
308  *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
309  ++LiteralEnd;
310  if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
311  OS.write(LastEmitted, LiteralEnd-LastEmitted);
312  LastEmitted = LiteralEnd;
313  break;
314  }
315  case '\n':
316  ++LastEmitted; // Consume newline character.
317  OS << '\n'; // Indent code with newline.
318  break;
319  case '$': {
320  ++LastEmitted; // Consume '$' character.
321  bool Done = true;
322 
323  // Handle escapes.
324  switch (*LastEmitted) {
325  default: Done = false; break;
326  case '$': // $$ -> $
327  if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
328  OS << '$';
329  ++LastEmitted; // Consume second '$' character.
330  break;
331  case '(': // $( -> same as GCC's { character.
332  ++LastEmitted; // Consume '(' character.
333  if (CurVariant != -1)
334  report_fatal_error("Nested variants found in inline asm string: '" +
335  Twine(AsmStr) + "'");
336  CurVariant = 0; // We're in the first variant now.
337  break;
338  case '|':
339  ++LastEmitted; // consume '|' character.
340  if (CurVariant == -1)
341  OS << '|'; // this is gcc's behavior for | outside a variant
342  else
343  ++CurVariant; // We're in the next variant.
344  break;
345  case ')': // $) -> same as GCC's } char.
346  ++LastEmitted; // consume ')' character.
347  if (CurVariant == -1)
348  OS << '}'; // this is gcc's behavior for } outside a variant
349  else
350  CurVariant = -1;
351  break;
352  }
353  if (Done) break;
354 
355  bool HasCurlyBraces = false;
356  if (*LastEmitted == '{') { // ${variable}
357  ++LastEmitted; // Consume '{' character.
358  HasCurlyBraces = true;
359  }
360 
361  // If we have ${:foo}, then this is not a real operand reference, it is a
362  // "magic" string reference, just like in .td files. Arrange to call
363  // PrintSpecial.
364  if (HasCurlyBraces && *LastEmitted == ':') {
365  ++LastEmitted;
366  const char *StrStart = LastEmitted;
367  const char *StrEnd = strchr(StrStart, '}');
368  if (!StrEnd)
369  report_fatal_error("Unterminated ${:foo} operand in inline asm"
370  " string: '" + Twine(AsmStr) + "'");
371 
372  std::string Val(StrStart, StrEnd);
373  AP->PrintSpecial(MI, OS, Val.c_str());
374  LastEmitted = StrEnd+1;
375  break;
376  }
377 
378  const char *IDStart = LastEmitted;
379  const char *IDEnd = IDStart;
380  while (*IDEnd >= '0' && *IDEnd <= '9') ++IDEnd;
381 
382  unsigned Val;
383  if (StringRef(IDStart, IDEnd-IDStart).getAsInteger(10, Val))
384  report_fatal_error("Bad $ operand number in inline asm string: '" +
385  Twine(AsmStr) + "'");
386  LastEmitted = IDEnd;
387 
388  char Modifier[2] = { 0, 0 };
389 
390  if (HasCurlyBraces) {
391  // If we have curly braces, check for a modifier character. This
392  // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
393  if (*LastEmitted == ':') {
394  ++LastEmitted; // Consume ':' character.
395  if (*LastEmitted == 0)
396  report_fatal_error("Bad ${:} expression in inline asm string: '" +
397  Twine(AsmStr) + "'");
398 
399  Modifier[0] = *LastEmitted;
400  ++LastEmitted; // Consume modifier character.
401  }
402 
403  if (*LastEmitted != '}')
404  report_fatal_error("Bad ${} expression in inline asm string: '" +
405  Twine(AsmStr) + "'");
406  ++LastEmitted; // Consume '}' character.
407  }
408 
409  if (Val >= NumOperands-1)
410  report_fatal_error("Invalid $ operand number in inline asm string: '" +
411  Twine(AsmStr) + "'");
412 
413  // Okay, we finally have a value number. Ask the target to print this
414  // operand!
415  if (CurVariant == -1 || CurVariant == AsmPrinterVariant) {
416  unsigned OpNo = InlineAsm::MIOp_FirstOperand;
417 
418  bool Error = false;
419 
420  // Scan to find the machine operand number for the operand.
421  for (; Val; --Val) {
422  if (OpNo >= MI->getNumOperands()) break;
423  unsigned OpFlags = MI->getOperand(OpNo).getImm();
424  OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1;
425  }
426 
427  // We may have a location metadata attached to the end of the
428  // instruction, and at no point should see metadata at any
429  // other point while processing. It's an error if so.
430  if (OpNo >= MI->getNumOperands() ||
431  MI->getOperand(OpNo).isMetadata()) {
432  Error = true;
433  } else {
434  unsigned OpFlags = MI->getOperand(OpNo).getImm();
435  ++OpNo; // Skip over the ID number.
436 
437  if (Modifier[0] == 'l') { // Labels are target independent.
438  // FIXME: What if the operand isn't an MBB, report error?
439  const MCSymbol *Sym = MI->getOperand(OpNo).getMBB()->getSymbol();
440  Sym->print(OS, AP->MAI);
441  } else {
442  if (InlineAsm::isMemKind(OpFlags)) {
443  Error = AP->PrintAsmMemoryOperand(MI, OpNo, InlineAsmVariant,
444  Modifier[0] ? Modifier : nullptr,
445  OS);
446  } else {
447  Error = AP->PrintAsmOperand(MI, OpNo, InlineAsmVariant,
448  Modifier[0] ? Modifier : nullptr, OS);
449  }
450  }
451  }
452  if (Error) {
453  std::string msg;
454  raw_string_ostream Msg(msg);
455  Msg << "invalid operand in inline asm: '" << AsmStr << "'";
456  MMI->getModule()->getContext().emitError(LocCookie, Msg.str());
457  }
458  }
459  break;
460  }
461  }
462  }
463  OS << '\n' << (char)0; // null terminate string.
464 }
465 
466 /// EmitInlineAsm - This method formats and emits the specified machine
467 /// instruction that is an inline asm.
468 void AsmPrinter::EmitInlineAsm(const MachineInstr *MI) const {
469  assert(MI->isInlineAsm() && "printInlineAsm only works on inline asms");
470 
471  // Count the number of register definitions to find the asm string.
472  unsigned NumDefs = 0;
473  for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef();
474  ++NumDefs)
475  assert(NumDefs != MI->getNumOperands()-2 && "No asm string?");
476 
477  assert(MI->getOperand(NumDefs).isSymbol() && "No asm string?");
478 
479  // Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
480  const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
481 
482  // If this asmstr is empty, just print the #APP/#NOAPP markers.
483  // These are useful to see where empty asm's wound up.
484  if (AsmStr[0] == 0) {
485  OutStreamer->emitRawComment(MAI->getInlineAsmStart());
486  OutStreamer->emitRawComment(MAI->getInlineAsmEnd());
487  return;
488  }
489 
490  // Emit the #APP start marker. This has to happen even if verbose-asm isn't
491  // enabled, so we use emitRawComment.
492  OutStreamer->emitRawComment(MAI->getInlineAsmStart());
493 
494  // Get the !srcloc metadata node if we have it, and decode the loc cookie from
495  // it.
496  unsigned LocCookie = 0;
497  const MDNode *LocMD = nullptr;
498  for (unsigned i = MI->getNumOperands(); i != 0; --i) {
499  if (MI->getOperand(i-1).isMetadata() &&
500  (LocMD = MI->getOperand(i-1).getMetadata()) &&
501  LocMD->getNumOperands() != 0) {
502  if (const ConstantInt *CI =
503  mdconst::dyn_extract<ConstantInt>(LocMD->getOperand(0))) {
504  LocCookie = CI->getZExtValue();
505  break;
506  }
507  }
508  }
509 
510  // Emit the inline asm to a temporary string so we can emit it through
511  // EmitInlineAsm.
512  SmallString<256> StringData;
513  raw_svector_ostream OS(StringData);
514 
515  // The variant of the current asmprinter.
516  int AsmPrinterVariant = MAI->getAssemblerDialect();
517  InlineAsm::AsmDialect InlineAsmVariant = MI->getInlineAsmDialect();
518  AsmPrinter *AP = const_cast<AsmPrinter*>(this);
519  if (InlineAsmVariant == InlineAsm::AD_ATT)
520  EmitGCCInlineAsmStr(AsmStr, MI, MMI, InlineAsmVariant, AsmPrinterVariant,
521  AP, LocCookie, OS);
522  else
523  EmitMSInlineAsmStr(AsmStr, MI, MMI, InlineAsmVariant, AP, LocCookie, OS);
524 
525  // Reset SanitizeAddress based on the function's attribute.
526  MCTargetOptions MCOptions = TM.Options.MCOptions;
527  MCOptions.SanitizeAddress =
528  MF->getFunction().hasFnAttribute(Attribute::SanitizeAddress);
529 
530  // Emit warnings if we use reserved registers on the clobber list, as
531  // that might give surprising results.
532  std::vector<std::string> RestrRegs;
533  // Start with the first operand descriptor, and iterate over them.
534  for (unsigned I = InlineAsm::MIOp_FirstOperand, NumOps = MI->getNumOperands();
535  I < NumOps; ++I) {
536  const MachineOperand &MO = MI->getOperand(I);
537  if (MO.isImm()) {
538  unsigned Flags = MO.getImm();
541  !TRI->isAsmClobberable(*MF, MI->getOperand(I + 1).getReg())) {
542  RestrRegs.push_back(TRI->getName(MI->getOperand(I + 1).getReg()));
543  }
544  // Skip to one before the next operand descriptor, if it exists.
546  }
547  }
548 
549  if (!RestrRegs.empty()) {
550  unsigned BufNum = addInlineAsmDiagBuffer(OS.str(), LocMD);
551  auto &SrcMgr = DiagInfo->SrcMgr;
553  SrcMgr.getMemoryBuffer(BufNum)->getBuffer().begin());
554 
555  std::string Msg = "inline asm clobber list contains reserved registers: ";
556  for (auto I = RestrRegs.begin(), E = RestrRegs.end(); I != E; I++) {
557  if(I != RestrRegs.begin())
558  Msg += ", ";
559  Msg += *I;
560  }
561  std::string Note = "Reserved registers on the clobber list may not be "
562  "preserved across the asm statement, and clobbering them may "
563  "lead to undefined behaviour.";
564  SrcMgr.PrintMessage(Loc, SourceMgr::DK_Warning, Msg);
565  SrcMgr.PrintMessage(Loc, SourceMgr::DK_Note, Note);
566  }
567 
568  EmitInlineAsm(OS.str(), getSubtargetInfo(), MCOptions, LocMD,
569  MI->getInlineAsmDialect());
570 
571  // Emit the #NOAPP end marker. This has to happen even if verbose-asm isn't
572  // enabled, so we use emitRawComment.
573  OutStreamer->emitRawComment(MAI->getInlineAsmEnd());
574 }
575 
576 
577 /// PrintSpecial - Print information related to the specified machine instr
578 /// that is independent of the operand, and may be independent of the instr
579 /// itself. This can be useful for portably encoding the comment character
580 /// or other bits of target-specific knowledge into the asmstrings. The
581 /// syntax used is ${:comment}. Targets can override this to add support
582 /// for their own strange codes.
584  const char *Code) const {
585  if (!strcmp(Code, "private")) {
586  const DataLayout &DL = MF->getDataLayout();
587  OS << DL.getPrivateGlobalPrefix();
588  } else if (!strcmp(Code, "comment")) {
589  OS << MAI->getCommentString();
590  } else if (!strcmp(Code, "uid")) {
591  // Comparing the address of MI isn't sufficient, because machineinstrs may
592  // be allocated to the same address across functions.
593 
594  // If this is a new LastFn instruction, bump the counter.
595  if (LastMI != MI || LastFn != getFunctionNumber()) {
596  ++Counter;
597  LastMI = MI;
598  LastFn = getFunctionNumber();
599  }
600  OS << Counter;
601  } else {
602  std::string msg;
603  raw_string_ostream Msg(msg);
604  Msg << "Unknown special formatter '" << Code
605  << "' for machine instr: " << *MI;
606  report_fatal_error(Msg.str());
607  }
608 }
609 
610 /// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
611 /// instruction, using the specified assembler variant. Targets should
612 /// override this to format as appropriate.
613 bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
614  unsigned AsmVariant, const char *ExtraCode,
615  raw_ostream &O) {
616  // Does this asm operand have a single letter operand modifier?
617  if (ExtraCode && ExtraCode[0]) {
618  if (ExtraCode[1] != 0) return true; // Unknown modifier.
619 
620  const MachineOperand &MO = MI->getOperand(OpNo);
621  switch (ExtraCode[0]) {
622  default:
623  return true; // Unknown modifier.
624  case 'c': // Substitute immediate value without immediate syntax
626  return true;
627  O << MO.getImm();
628  return false;
629  case 'n': // Negate the immediate constant.
631  return true;
632  O << -MO.getImm();
633  return false;
634  case 's': // The GCC deprecated s modifier
636  return true;
637  O << ((32 - MO.getImm()) & 31);
638  return false;
639  }
640  }
641  return true;
642 }
643 
644 bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
645  unsigned AsmVariant,
646  const char *ExtraCode, raw_ostream &O) {
647  // Target doesn't support this yet!
648  return true;
649 }
650 
652 
654  const MCSubtargetInfo *EndInfo) const {}
virtual void emitInlineAsmStart() const
Let the target do anything it needs to do before emitting inlineasm.
A parsed version of the target data layout string in and methods for querying it. ...
Definition: DataLayout.h:111
const char * getInlineAsmStart() const
Definition: MCAsmInfo.h:504
unsigned FindBufferContainingLoc(SMLoc Loc) const
Return the ID of the buffer containing the specified location.
Definition: SourceMgr.cpp:61
LLVMContext & Context
MachineBasicBlock * getMBB() const
std::unique_ptr< MCStreamer > OutStreamer
This is the MCStreamer object for the file we are generating.
Definition: AsmPrinter.h:93
MCTargetOptions MCOptions
Machine level options.
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
Compute iterated dominance frontiers using a linear time algorithm.
Definition: AllocatorList.h:24
SMLoc getLoc() const
Definition: SourceMgr.h:286
StringRef getPrivateGlobalPrefix() const
Definition: DataLayout.h:294
MCSymbol - Instances of this class represent a symbol name in the MC file, and MCSymbols are created ...
Definition: MCSymbol.h:42
std::vector< std::string > IASSearchPaths
Additional paths to search for .include directives when using the integrated assembler.
MCContext & OutContext
This is the context for the output file that we are streaming.
Definition: AsmPrinter.h:88
virtual const TargetRegisterInfo * getRegisterInfo() const
getRegisterInfo - If register information is available, return it.
bool EnablePrintSchedInfo
Enable print [latency:throughput] in output.
Definition: AsmPrinter.h:125
const MCSubtargetInfo & getSubtargetInfo() const
Return information about subtarget.
Definition: AsmPrinter.cpp:224
unsigned getReg() const
getReg - Returns the register number.
LLVM_NODISCARD LLVM_ATTRIBUTE_ALWAYS_INLINE size_t size() const
size - Get the string size.
Definition: StringRef.h:138
SourceMgr SrcMgr
Definition: Error.cpp:24
bool SanitizeAddress
Enables AddressSanitizer instrumentation at machine level.
MCInstrInfo * createMCInstrInfo() const
createMCInstrInfo - Create a MCInstrInfo implementation.
bool isInlineAsm() const
void * getInlineAsmDiagnosticContext() const
getInlineAsmDiagnosticContext - Return the diagnostic context set by setInlineAsmDiagnosticHandler.
bool hasFnAttribute(Attribute::AttrKind Kind) const
Return true if the function has the attribute.
Definition: Function.h:321
A raw_ostream that writes to an SmallVector or SmallString.
Definition: raw_ostream.h:510
bool isMetadata() const
isMetadata - Tests if this is a MO_Metadata operand.
unsigned const TargetRegisterInfo * TRI
Metadata node.
Definition: Metadata.h:864
MachineFunction * MF
The current machine function.
Definition: AsmPrinter.h:96
const MDOperand & getOperand(unsigned I) const
Definition: Metadata.h:1069
const char * getInlineAsmEnd() const
Definition: MCAsmInfo.h:505
LLVMContext::InlineAsmDiagHandlerTy DiagHandler
Definition: AsmPrinter.h:163
bool isImm() const
isImm - Tests if this is a MO_Immediate operand.
MCAsmParser * createMCAsmParser(SourceMgr &, MCContext &, MCStreamer &, const MCAsmInfo &, unsigned CB=0)
Create an MCAsmParser instance.
Definition: AsmParser.cpp:5918
Twine - A lightweight data structure for efficiently representing the concatenation of temporary valu...
Definition: Twine.h:81
unsigned getNumOperands() const
Retuns the total number of operands.
Definition: MachineInstr.h:412
LLVMContext & getContext() const
Get the global data context.
Definition: Module.h:243
int getLineNo() const
Definition: SourceMgr.h:288
const char * getSymbolName() const
virtual unsigned getFrameRegister(const MachineFunction &MF) const =0
Debug information queries.
Context object for machine code objects.
Definition: MCContext.h:63
void emitError(unsigned LocCookie, const Twine &ErrorStr)
emitError - Emit an error message to the currently installed error handler with optional location inf...
const MCContext & getContext() const
unsigned AddNewSourceBuffer(std::unique_ptr< MemoryBuffer > F, SMLoc IncludeLoc)
Add a new source buffer to this source manager.
Definition: SourceMgr.h:152
LLVM_NODISCARD LLVM_ATTRIBUTE_ALWAYS_INLINE bool empty() const
empty - Check if the string is empty.
Definition: StringRef.h:133
virtual bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo, unsigned AsmVariant, const char *ExtraCode, raw_ostream &OS)
Print the specified operand of MI, an INLINEASM instruction, using the specified assembler variant as...
LLVM_NODISCARD LLVM_ATTRIBUTE_ALWAYS_INLINE StringRef substr(size_t Start, size_t N=npos) const
Return a reference to the substring from [Start, Start + N).
Definition: StringRef.h:598
MachineModuleInfo * MMI
This is a pointer to the current MachineModuleInfo.
Definition: AsmPrinter.h:99
const DataLayout & getDataLayout() const
Return the DataLayout attached to the Module associated to this MF.
const char * getName(unsigned RegNo) const
Return the human-readable symbolic target-specific name for the specified physical register...
This class is intended to be used as a base class for asm properties and features specific to the tar...
Definition: MCAsmInfo.h:56
void setInlineSourceManager(SourceMgr *SM)
Definition: MCContext.h:291
* if(!EatIfPresent(lltok::kw_thread_local)) return false
ParseOptionalThreadLocal := /*empty.
const MCAsmInfo * MAI
Target Asm Printer information.
Definition: AsmPrinter.h:84
const TargetSubtargetInfo & getSubtarget() const
getSubtarget - Return the subtarget for which this machine code is being compiled.
This is an important class for using LLVM in a threaded context.
Definition: LLVMContext.h:69
unsigned getAssemblerDialect() const
Definition: MCAsmInfo.h:509
static GCRegistry::Add< CoreCLRGC > E("coreclr", "CoreCLR-compatible GC")
This file contains the declarations for the subclasses of Constant, which represent the different fla...
virtual bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo, unsigned AsmVariant, const char *ExtraCode, raw_ostream &OS)
Print the specified operand of MI, an INLINEASM instruction, using the specified assembler variant...
const MCAsmInfo * getMCAsmInfo() const
Return target specific asm information.
TargetMachine & TM
Target machine description.
Definition: AsmPrinter.h:81
This class is intended to be used as a driving class for all asm writers.
Definition: AsmPrinter.h:78
static unsigned getNumOperandRegisters(unsigned Flag)
getNumOperandRegisters - Extract the number of registers field from the inline asm operand flag...
Definition: InlineAsm.h:336
StringRef getCommentString() const
Definition: MCAsmInfo.h:486
static unsigned getKind(unsigned Flags)
Definition: InlineAsm.h:325
static void srcMgrDiagHandler(const SMDiagnostic &Diag, void *diagInfo)
srcMgrDiagHandler - This callback is invoked when the SourceMgr for an inline asm has an error in it...
This owns the files read by a parser, handles include stacks, and handles diagnostic wrangling...
Definition: SourceMgr.h:42
const Target & getTarget() const
static bool isMemKind(unsigned Flag)
Definition: InlineAsm.h:277
MCTargetAsmParser * createMCAsmParser(const MCSubtargetInfo &STI, MCAsmParser &Parser, const MCInstrInfo &MII, const MCTargetOptions &Options) const
createMCAsmParser - Create a target specific assembly parser.
TargetRegisterInfo base class - We assume that the target defines a static array of TargetRegisterDes...
LLVM_NODISCARD char back() const
back - Get the last character in the string.
Definition: StringRef.h:149
std::string & str()
Flushes the stream contents to the target string and returns the string&#39;s reference.
Definition: raw_ostream.h:499
raw_ostream & write(unsigned char C)
std::enable_if< std::numeric_limits< T >::is_signed, bool >::type getAsInteger(unsigned Radix, T &Result) const
Parse the current string as an integer of the specified radix.
Definition: StringRef.h:497
unsigned getFunctionNumber() const
Return a unique ID for the current function.
Definition: AsmPrinter.cpp:206
InlineAsm::AsmDialect getInlineAsmDialect() const
This is the shared class of boolean and integer constants.
Definition: Constants.h:84
MachineOperand class - Representation of each machine instruction operand.
Module.h This file contains the declarations for the Module class.
virtual void emitInlineAsmEnd(const MCSubtargetInfo &StartInfo, const MCSubtargetInfo *EndInfo) const
Let the target do anything it needs to do after emitting inlineasm.
StringRef str()
Return a StringRef for the vector contents.
Definition: raw_ostream.h:535
int64_t getImm() const
const Function & getFunction() const
Return the LLVM function that this machine code represents.
static std::unique_ptr< MemoryBuffer > getMemBufferCopy(StringRef InputData, const Twine &BufferName="")
Open the specified memory range as a MemoryBuffer, copying the contents and taking ownership of it...
bool useIntegratedAssembler() const
Return true if assembly (inline or otherwise) should be parsed.
Definition: MCAsmInfo.h:610
static SMLoc getFromPointer(const char *Ptr)
Definition: SMLoc.h:37
Representation of each machine instruction.
Definition: MachineInstr.h:64
TargetOptions Options
Definition: TargetMachine.h:97
MCSymbol * getSymbol() const
Return the MCSymbol for this basic block.
#define I(x, y, z)
Definition: MD5.cpp:58
Generic base class for all target subtargets.
InlineAsmDiagHandlerTy getInlineAsmDiagnosticHandler() const
getInlineAsmDiagnosticHandler - Return the diagnostic handler set by setInlineAsmDiagnosticHandler.
bool isSymbol() const
isSymbol - Tests if this is a MO_ExternalSymbol operand.
const Module * getModule() const
bool isReg() const
isReg - Tests if this is a MO_Register operand.
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())
A raw_ostream that writes to an std::string.
Definition: raw_ostream.h:483
static void EmitGCCInlineAsmStr(const char *AsmStr, const MachineInstr *MI, MachineModuleInfo *MMI, int InlineAsmVariant, int AsmPrinterVariant, AsmPrinter *AP, unsigned LocCookie, raw_ostream &OS)
Lightweight error class with error context and mandatory checking.
Definition: Error.h:158
This class implements an extremely fast bulk output stream that can only output to a stream...
Definition: raw_ostream.h:46
IRTranslator LLVM IR MI
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:49
static void EmitMSInlineAsmStr(const char *AsmStr, const MachineInstr *MI, MachineModuleInfo *MMI, int InlineAsmVariant, AsmPrinter *AP, unsigned LocCookie, raw_ostream &OS)
virtual bool isAsmClobberable(const MachineFunction &MF, unsigned PhysReg) const
Returns false if we can&#39;t guarantee that Physreg, specified as an IR asm clobber constraint, will be preserved across the statement.
std::vector< const MDNode * > LocInfos
Definition: AsmPrinter.h:162
Represents a location in source code.
Definition: SMLoc.h:24
unsigned getNumOperands() const
Return number of MDNode operands.
Definition: Metadata.h:1075
const MachineOperand & getOperand(unsigned i) const
Definition: MachineInstr.h:414
MachineOperandType getType() const
getType - Returns the MachineOperandType for this operand.
virtual void PrintSpecial(const MachineInstr *MI, raw_ostream &OS, const char *Code) const
Print information related to the specified machine instr that is independent of the operand...
const MDNode * getMetadata() const
This class contains meta information specific to a module.
Instances of this class encapsulate one diagnostic report, allowing printing to a raw_ostream as a ca...
Definition: SourceMgr.h:260
void print(raw_ostream &OS, const MCAsmInfo *MAI) const
print - Print the value to the stream OS.
Definition: MCSymbol.cpp:60