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  // Enable lexing Masm binary and hex integer literals in intel inline
160  // assembly.
161  if (Dialect == InlineAsm::AD_Intel)
162  Parser->getLexer().setLexMasmIntegers(true);
163  if (MF) {
165  TAP->SetFrameRegister(TRI->getFrameRegister(*MF));
166  }
167 
169  // Don't implicitly switch to the text section before the asm.
170  int Res = Parser->Run(/*NoInitialTextSection*/ true,
171  /*NoFinalize*/ true);
172  emitInlineAsmEnd(STI, &TAP->getSTI());
173 
174  if (Res && !DiagInfo->DiagHandler)
175  report_fatal_error("Error parsing inline asm\n");
176 }
177 
178 static void EmitMSInlineAsmStr(const char *AsmStr, const MachineInstr *MI,
179  MachineModuleInfo *MMI, int InlineAsmVariant,
180  AsmPrinter *AP, unsigned LocCookie,
181  raw_ostream &OS) {
182  // Switch to the inline assembly variant.
183  OS << "\t.intel_syntax\n\t";
184 
185  const char *LastEmitted = AsmStr; // One past the last character emitted.
186  unsigned NumOperands = MI->getNumOperands();
187 
188  while (*LastEmitted) {
189  switch (*LastEmitted) {
190  default: {
191  // Not a special case, emit the string section literally.
192  const char *LiteralEnd = LastEmitted+1;
193  while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
194  *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
195  ++LiteralEnd;
196 
197  OS.write(LastEmitted, LiteralEnd-LastEmitted);
198  LastEmitted = LiteralEnd;
199  break;
200  }
201  case '\n':
202  ++LastEmitted; // Consume newline character.
203  OS << '\n'; // Indent code with newline.
204  break;
205  case '$': {
206  ++LastEmitted; // Consume '$' character.
207  bool Done = true;
208 
209  // Handle escapes.
210  switch (*LastEmitted) {
211  default: Done = false; break;
212  case '$':
213  ++LastEmitted; // Consume second '$' character.
214  break;
215  }
216  if (Done) break;
217 
218  // If we have ${:foo}, then this is not a real operand reference, it is a
219  // "magic" string reference, just like in .td files. Arrange to call
220  // PrintSpecial.
221  if (LastEmitted[0] == '{' && LastEmitted[1] == ':') {
222  LastEmitted += 2;
223  const char *StrStart = LastEmitted;
224  const char *StrEnd = strchr(StrStart, '}');
225  if (!StrEnd)
226  report_fatal_error("Unterminated ${:foo} operand in inline asm"
227  " string: '" + Twine(AsmStr) + "'");
228 
229  std::string Val(StrStart, StrEnd);
230  AP->PrintSpecial(MI, OS, Val.c_str());
231  LastEmitted = StrEnd+1;
232  break;
233  }
234 
235  const char *IDStart = LastEmitted;
236  const char *IDEnd = IDStart;
237  while (*IDEnd >= '0' && *IDEnd <= '9') ++IDEnd;
238 
239  unsigned Val;
240  if (StringRef(IDStart, IDEnd-IDStart).getAsInteger(10, Val))
241  report_fatal_error("Bad $ operand number in inline asm string: '" +
242  Twine(AsmStr) + "'");
243  LastEmitted = IDEnd;
244 
245  if (Val >= NumOperands-1)
246  report_fatal_error("Invalid $ operand number in inline asm string: '" +
247  Twine(AsmStr) + "'");
248 
249  // Okay, we finally have a value number. Ask the target to print this
250  // operand!
251  unsigned OpNo = InlineAsm::MIOp_FirstOperand;
252 
253  bool Error = false;
254 
255  // Scan to find the machine operand number for the operand.
256  for (; Val; --Val) {
257  if (OpNo >= MI->getNumOperands()) break;
258  unsigned OpFlags = MI->getOperand(OpNo).getImm();
259  OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1;
260  }
261 
262  // We may have a location metadata attached to the end of the
263  // instruction, and at no point should see metadata at any
264  // other point while processing. It's an error if so.
265  if (OpNo >= MI->getNumOperands() ||
266  MI->getOperand(OpNo).isMetadata()) {
267  Error = true;
268  } else {
269  unsigned OpFlags = MI->getOperand(OpNo).getImm();
270  ++OpNo; // Skip over the ID number.
271 
272  if (InlineAsm::isMemKind(OpFlags)) {
273  Error = AP->PrintAsmMemoryOperand(MI, OpNo, InlineAsmVariant,
274  /*Modifier*/ nullptr, OS);
275  } else {
276  Error = AP->PrintAsmOperand(MI, OpNo, InlineAsmVariant,
277  /*Modifier*/ nullptr, OS);
278  }
279  }
280  if (Error) {
281  std::string msg;
282  raw_string_ostream Msg(msg);
283  Msg << "invalid operand in inline asm: '" << AsmStr << "'";
284  MMI->getModule()->getContext().emitError(LocCookie, Msg.str());
285  }
286  break;
287  }
288  }
289  }
290  OS << "\n\t.att_syntax\n" << (char)0; // null terminate string.
291 }
292 
293 static void EmitGCCInlineAsmStr(const char *AsmStr, const MachineInstr *MI,
294  MachineModuleInfo *MMI, int InlineAsmVariant,
295  int AsmPrinterVariant, AsmPrinter *AP,
296  unsigned LocCookie, raw_ostream &OS) {
297  int CurVariant = -1; // The number of the {.|.|.} region we are in.
298  const char *LastEmitted = AsmStr; // One past the last character emitted.
299  unsigned NumOperands = MI->getNumOperands();
300 
301  OS << '\t';
302 
303  while (*LastEmitted) {
304  switch (*LastEmitted) {
305  default: {
306  // Not a special case, emit the string section literally.
307  const char *LiteralEnd = LastEmitted+1;
308  while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
309  *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
310  ++LiteralEnd;
311  if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
312  OS.write(LastEmitted, LiteralEnd-LastEmitted);
313  LastEmitted = LiteralEnd;
314  break;
315  }
316  case '\n':
317  ++LastEmitted; // Consume newline character.
318  OS << '\n'; // Indent code with newline.
319  break;
320  case '$': {
321  ++LastEmitted; // Consume '$' character.
322  bool Done = true;
323 
324  // Handle escapes.
325  switch (*LastEmitted) {
326  default: Done = false; break;
327  case '$': // $$ -> $
328  if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
329  OS << '$';
330  ++LastEmitted; // Consume second '$' character.
331  break;
332  case '(': // $( -> same as GCC's { character.
333  ++LastEmitted; // Consume '(' character.
334  if (CurVariant != -1)
335  report_fatal_error("Nested variants found in inline asm string: '" +
336  Twine(AsmStr) + "'");
337  CurVariant = 0; // We're in the first variant now.
338  break;
339  case '|':
340  ++LastEmitted; // consume '|' character.
341  if (CurVariant == -1)
342  OS << '|'; // this is gcc's behavior for | outside a variant
343  else
344  ++CurVariant; // We're in the next variant.
345  break;
346  case ')': // $) -> same as GCC's } char.
347  ++LastEmitted; // consume ')' character.
348  if (CurVariant == -1)
349  OS << '}'; // this is gcc's behavior for } outside a variant
350  else
351  CurVariant = -1;
352  break;
353  }
354  if (Done) break;
355 
356  bool HasCurlyBraces = false;
357  if (*LastEmitted == '{') { // ${variable}
358  ++LastEmitted; // Consume '{' character.
359  HasCurlyBraces = true;
360  }
361 
362  // If we have ${:foo}, then this is not a real operand reference, it is a
363  // "magic" string reference, just like in .td files. Arrange to call
364  // PrintSpecial.
365  if (HasCurlyBraces && *LastEmitted == ':') {
366  ++LastEmitted;
367  const char *StrStart = LastEmitted;
368  const char *StrEnd = strchr(StrStart, '}');
369  if (!StrEnd)
370  report_fatal_error("Unterminated ${:foo} operand in inline asm"
371  " string: '" + Twine(AsmStr) + "'");
372 
373  std::string Val(StrStart, StrEnd);
374  AP->PrintSpecial(MI, OS, Val.c_str());
375  LastEmitted = StrEnd+1;
376  break;
377  }
378 
379  const char *IDStart = LastEmitted;
380  const char *IDEnd = IDStart;
381  while (*IDEnd >= '0' && *IDEnd <= '9') ++IDEnd;
382 
383  unsigned Val;
384  if (StringRef(IDStart, IDEnd-IDStart).getAsInteger(10, Val))
385  report_fatal_error("Bad $ operand number in inline asm string: '" +
386  Twine(AsmStr) + "'");
387  LastEmitted = IDEnd;
388 
389  char Modifier[2] = { 0, 0 };
390 
391  if (HasCurlyBraces) {
392  // If we have curly braces, check for a modifier character. This
393  // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
394  if (*LastEmitted == ':') {
395  ++LastEmitted; // Consume ':' character.
396  if (*LastEmitted == 0)
397  report_fatal_error("Bad ${:} expression in inline asm string: '" +
398  Twine(AsmStr) + "'");
399 
400  Modifier[0] = *LastEmitted;
401  ++LastEmitted; // Consume modifier character.
402  }
403 
404  if (*LastEmitted != '}')
405  report_fatal_error("Bad ${} expression in inline asm string: '" +
406  Twine(AsmStr) + "'");
407  ++LastEmitted; // Consume '}' character.
408  }
409 
410  if (Val >= NumOperands-1)
411  report_fatal_error("Invalid $ operand number in inline asm string: '" +
412  Twine(AsmStr) + "'");
413 
414  // Okay, we finally have a value number. Ask the target to print this
415  // operand!
416  if (CurVariant == -1 || CurVariant == AsmPrinterVariant) {
417  unsigned OpNo = InlineAsm::MIOp_FirstOperand;
418 
419  bool Error = false;
420 
421  // Scan to find the machine operand number for the operand.
422  for (; Val; --Val) {
423  if (OpNo >= MI->getNumOperands()) break;
424  unsigned OpFlags = MI->getOperand(OpNo).getImm();
425  OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1;
426  }
427 
428  // We may have a location metadata attached to the end of the
429  // instruction, and at no point should see metadata at any
430  // other point while processing. It's an error if so.
431  if (OpNo >= MI->getNumOperands() ||
432  MI->getOperand(OpNo).isMetadata()) {
433  Error = true;
434  } else {
435  unsigned OpFlags = MI->getOperand(OpNo).getImm();
436  ++OpNo; // Skip over the ID number.
437 
438  if (Modifier[0] == 'l') { // Labels are target independent.
439  // FIXME: What if the operand isn't an MBB, report error?
440  const MCSymbol *Sym = MI->getOperand(OpNo).getMBB()->getSymbol();
441  Sym->print(OS, AP->MAI);
442  } else {
443  if (InlineAsm::isMemKind(OpFlags)) {
444  Error = AP->PrintAsmMemoryOperand(MI, OpNo, InlineAsmVariant,
445  Modifier[0] ? Modifier : nullptr,
446  OS);
447  } else {
448  Error = AP->PrintAsmOperand(MI, OpNo, InlineAsmVariant,
449  Modifier[0] ? Modifier : nullptr, OS);
450  }
451  }
452  }
453  if (Error) {
454  std::string msg;
455  raw_string_ostream Msg(msg);
456  Msg << "invalid operand in inline asm: '" << AsmStr << "'";
457  MMI->getModule()->getContext().emitError(LocCookie, Msg.str());
458  }
459  }
460  break;
461  }
462  }
463  }
464  OS << '\n' << (char)0; // null terminate string.
465 }
466 
467 /// EmitInlineAsm - This method formats and emits the specified machine
468 /// instruction that is an inline asm.
469 void AsmPrinter::EmitInlineAsm(const MachineInstr *MI) const {
470  assert(MI->isInlineAsm() && "printInlineAsm only works on inline asms");
471 
472  // Count the number of register definitions to find the asm string.
473  unsigned NumDefs = 0;
474  for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef();
475  ++NumDefs)
476  assert(NumDefs != MI->getNumOperands()-2 && "No asm string?");
477 
478  assert(MI->getOperand(NumDefs).isSymbol() && "No asm string?");
479 
480  // Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
481  const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
482 
483  // If this asmstr is empty, just print the #APP/#NOAPP markers.
484  // These are useful to see where empty asm's wound up.
485  if (AsmStr[0] == 0) {
486  OutStreamer->emitRawComment(MAI->getInlineAsmStart());
487  OutStreamer->emitRawComment(MAI->getInlineAsmEnd());
488  return;
489  }
490 
491  // Emit the #APP start marker. This has to happen even if verbose-asm isn't
492  // enabled, so we use emitRawComment.
493  OutStreamer->emitRawComment(MAI->getInlineAsmStart());
494 
495  // Get the !srcloc metadata node if we have it, and decode the loc cookie from
496  // it.
497  unsigned LocCookie = 0;
498  const MDNode *LocMD = nullptr;
499  for (unsigned i = MI->getNumOperands(); i != 0; --i) {
500  if (MI->getOperand(i-1).isMetadata() &&
501  (LocMD = MI->getOperand(i-1).getMetadata()) &&
502  LocMD->getNumOperands() != 0) {
503  if (const ConstantInt *CI =
504  mdconst::dyn_extract<ConstantInt>(LocMD->getOperand(0))) {
505  LocCookie = CI->getZExtValue();
506  break;
507  }
508  }
509  }
510 
511  // Emit the inline asm to a temporary string so we can emit it through
512  // EmitInlineAsm.
513  SmallString<256> StringData;
514  raw_svector_ostream OS(StringData);
515 
516  // The variant of the current asmprinter.
517  int AsmPrinterVariant = MAI->getAssemblerDialect();
518  InlineAsm::AsmDialect InlineAsmVariant = MI->getInlineAsmDialect();
519  AsmPrinter *AP = const_cast<AsmPrinter*>(this);
520  if (InlineAsmVariant == InlineAsm::AD_ATT)
521  EmitGCCInlineAsmStr(AsmStr, MI, MMI, InlineAsmVariant, AsmPrinterVariant,
522  AP, LocCookie, OS);
523  else
524  EmitMSInlineAsmStr(AsmStr, MI, MMI, InlineAsmVariant, AP, LocCookie, OS);
525 
526  // Reset SanitizeAddress based on the function's attribute.
527  MCTargetOptions MCOptions = TM.Options.MCOptions;
528  MCOptions.SanitizeAddress =
529  MF->getFunction().hasFnAttribute(Attribute::SanitizeAddress);
530 
531  // Emit warnings if we use reserved registers on the clobber list, as
532  // that might give surprising results.
533  std::vector<std::string> RestrRegs;
534  // Start with the first operand descriptor, and iterate over them.
535  for (unsigned I = InlineAsm::MIOp_FirstOperand, NumOps = MI->getNumOperands();
536  I < NumOps; ++I) {
537  const MachineOperand &MO = MI->getOperand(I);
538  if (MO.isImm()) {
539  unsigned Flags = MO.getImm();
542  !TRI->isAsmClobberable(*MF, MI->getOperand(I + 1).getReg())) {
543  RestrRegs.push_back(TRI->getName(MI->getOperand(I + 1).getReg()));
544  }
545  // Skip to one before the next operand descriptor, if it exists.
547  }
548  }
549 
550  if (!RestrRegs.empty()) {
551  unsigned BufNum = addInlineAsmDiagBuffer(OS.str(), LocMD);
552  auto &SrcMgr = DiagInfo->SrcMgr;
554  SrcMgr.getMemoryBuffer(BufNum)->getBuffer().begin());
555 
556  std::string Msg = "inline asm clobber list contains reserved registers: ";
557  for (auto I = RestrRegs.begin(), E = RestrRegs.end(); I != E; I++) {
558  if(I != RestrRegs.begin())
559  Msg += ", ";
560  Msg += *I;
561  }
562  std::string Note = "Reserved registers on the clobber list may not be "
563  "preserved across the asm statement, and clobbering them may "
564  "lead to undefined behaviour.";
565  SrcMgr.PrintMessage(Loc, SourceMgr::DK_Warning, Msg);
566  SrcMgr.PrintMessage(Loc, SourceMgr::DK_Note, Note);
567  }
568 
569  EmitInlineAsm(OS.str(), getSubtargetInfo(), MCOptions, LocMD,
570  MI->getInlineAsmDialect());
571 
572  // Emit the #NOAPP end marker. This has to happen even if verbose-asm isn't
573  // enabled, so we use emitRawComment.
574  OutStreamer->emitRawComment(MAI->getInlineAsmEnd());
575 }
576 
577 
578 /// PrintSpecial - Print information related to the specified machine instr
579 /// that is independent of the operand, and may be independent of the instr
580 /// itself. This can be useful for portably encoding the comment character
581 /// or other bits of target-specific knowledge into the asmstrings. The
582 /// syntax used is ${:comment}. Targets can override this to add support
583 /// for their own strange codes.
585  const char *Code) const {
586  if (!strcmp(Code, "private")) {
587  const DataLayout &DL = MF->getDataLayout();
588  OS << DL.getPrivateGlobalPrefix();
589  } else if (!strcmp(Code, "comment")) {
590  OS << MAI->getCommentString();
591  } else if (!strcmp(Code, "uid")) {
592  // Comparing the address of MI isn't sufficient, because machineinstrs may
593  // be allocated to the same address across functions.
594 
595  // If this is a new LastFn instruction, bump the counter.
596  if (LastMI != MI || LastFn != getFunctionNumber()) {
597  ++Counter;
598  LastMI = MI;
599  LastFn = getFunctionNumber();
600  }
601  OS << Counter;
602  } else {
603  std::string msg;
604  raw_string_ostream Msg(msg);
605  Msg << "Unknown special formatter '" << Code
606  << "' for machine instr: " << *MI;
607  report_fatal_error(Msg.str());
608  }
609 }
610 
611 /// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
612 /// instruction, using the specified assembler variant. Targets should
613 /// override this to format as appropriate.
614 bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
615  unsigned AsmVariant, const char *ExtraCode,
616  raw_ostream &O) {
617  // Does this asm operand have a single letter operand modifier?
618  if (ExtraCode && ExtraCode[0]) {
619  if (ExtraCode[1] != 0) return true; // Unknown modifier.
620 
621  const MachineOperand &MO = MI->getOperand(OpNo);
622  switch (ExtraCode[0]) {
623  default:
624  return true; // Unknown modifier.
625  case 'c': // Substitute immediate value without immediate syntax
627  return true;
628  O << MO.getImm();
629  return false;
630  case 'n': // Negate the immediate constant.
632  return true;
633  O << -MO.getImm();
634  return false;
635  case 's': // The GCC deprecated s modifier
637  return true;
638  O << ((32 - MO.getImm()) & 31);
639  return false;
640  }
641  }
642  return true;
643 }
644 
645 bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
646  unsigned AsmVariant,
647  const char *ExtraCode, raw_ostream &O) {
648  // Target doesn't support this yet!
649  return true;
650 }
651 
653 
655  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:62
LLVMContext & Context
MachineBasicBlock * getMBB() const
std::unique_ptr< MCStreamer > OutStreamer
This is the MCStreamer object for the file we are generating.
Definition: AsmPrinter.h:94
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
This class represents lattice values for constants.
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:89
virtual const TargetRegisterInfo * getRegisterInfo() const
getRegisterInfo - If register information is available, return it.
bool EnablePrintSchedInfo
Enable print [latency:throughput] in output.
Definition: AsmPrinter.h:126
const MCSubtargetInfo & getSubtargetInfo() const
Return information about subtarget.
Definition: AsmPrinter.cpp:226
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:97
const MDOperand & getOperand(unsigned I) const
Definition: Metadata.h:1069
const char * getInlineAsmEnd() const
Definition: MCAsmInfo.h:505
LLVMContext::InlineAsmDiagHandlerTy DiagHandler
Definition: AsmPrinter.h:164
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:5923
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:100
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:85
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:82
This class is intended to be used as a driving class for all asm writers.
Definition: AsmPrinter.h:79
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:208
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:163
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