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"
16 #include "llvm/CodeGen/AsmPrinter.h"
17 #include "llvm/CodeGen/MachineBasicBlock.h"
18 #include "llvm/CodeGen/MachineFunction.h"
19 #include "llvm/CodeGen/MachineModuleInfo.h"
20 #include "llvm/CodeGen/TargetInstrInfo.h"
21 #include "llvm/CodeGen/TargetRegisterInfo.h"
22 #include "llvm/CodeGen/TargetSubtargetInfo.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"
29 #include "llvm/MC/MCParser/MCTargetAsmParser.h"
30 #include "llvm/MC/MCStreamer.h"
31 #include "llvm/MC/MCSubtargetInfo.h"
32 #include "llvm/MC/MCSymbol.h"
33 #include "llvm/Support/ErrorHandling.h"
34 #include "llvm/Support/MemoryBuffer.h"
35 #include "llvm/Support/SourceMgr.h"
36 #include "llvm/Support/TargetRegistry.h"
37 #include "llvm/Support/raw_ostream.h"
38 #include "llvm/Target/TargetMachine.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.
srcMgrDiagHandler(const SMDiagnostic & Diag,void * diagInfo)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 /// EmitInlineAsm - Emit a blob of inline asm to the output streamer.
EmitInlineAsm(StringRef Str,const MCSubtargetInfo & STI,const MCTargetOptions & MCOptions,const MDNode * LocMDNode,InlineAsm::AsmDialect Dialect) const75 void AsmPrinter::EmitInlineAsm(StringRef Str, const MCSubtargetInfo &STI,
76 const MCTargetOptions &MCOptions,
77 const MDNode *LocMDNode,
78 InlineAsm::AsmDialect Dialect) const {
79 assert(!Str.empty() && "Can't emit empty inline asm block");
80
81 // Remember if the buffer is nul terminated or not so we can avoid a copy.
82 bool isNullTerminated = Str.back() == 0;
83 if (isNullTerminated)
84 Str = Str.substr(0, Str.size()-1);
85
86 // If the output streamer does not have mature MC support or the integrated
87 // assembler has been disabled, just emit the blob textually.
88 // Otherwise parse the asm and emit it via MC support.
89 // This is useful in case the asm parser doesn't handle something but the
90 // system assembler does.
91 const MCAsmInfo *MCAI = TM.getMCAsmInfo();
92 assert(MCAI && "No MCAsmInfo");
93 if (!MCAI->useIntegratedAssembler() &&
94 !OutStreamer->isIntegratedAssemblerRequired()) {
95 emitInlineAsmStart();
96 OutStreamer->EmitRawText(Str);
97 emitInlineAsmEnd(STI, nullptr);
98 return;
99 }
100
101 if (!DiagInfo) {
102 DiagInfo = make_unique<SrcMgrDiagInfo>();
103
104 MCContext &Context = MMI->getContext();
105 Context.setInlineSourceManager(&DiagInfo->SrcMgr);
106
107 LLVMContext &LLVMCtx = MMI->getModule()->getContext();
108 if (LLVMCtx.getInlineAsmDiagnosticHandler()) {
109 DiagInfo->DiagHandler = LLVMCtx.getInlineAsmDiagnosticHandler();
110 DiagInfo->DiagContext = LLVMCtx.getInlineAsmDiagnosticContext();
111 DiagInfo->SrcMgr.setDiagHandler(srcMgrDiagHandler, DiagInfo.get());
112 }
113 }
114
115 SourceMgr &SrcMgr = DiagInfo->SrcMgr;
116 SrcMgr.setIncludeDirs(MCOptions.IASSearchPaths);
117
118 std::unique_ptr<MemoryBuffer> Buffer;
119 // The inline asm source manager will outlive Str, so make a copy of the
120 // string for SourceMgr to own.
121 Buffer = MemoryBuffer::getMemBufferCopy(Str, "<inline asm>");
122
123 // Tell SrcMgr about this buffer, it takes ownership of the buffer.
124 unsigned BufNum = SrcMgr.AddNewSourceBuffer(std::move(Buffer), SMLoc());
125
126 // Store LocMDNode in DiagInfo, using BufNum as an identifier.
127 if (LocMDNode) {
128 DiagInfo->LocInfos.resize(BufNum);
129 DiagInfo->LocInfos[BufNum-1] = LocMDNode;
130 }
131
132 std::unique_ptr<MCAsmParser> Parser(
133 createMCAsmParser(SrcMgr, OutContext, *OutStreamer, *MAI, BufNum));
134
135 // Do not use assembler-level information for parsing inline assembly.
136 OutStreamer->setUseAssemblerInfoForParsing(false);
137
138 // We create a new MCInstrInfo here since we might be at the module level
139 // and not have a MachineFunction to initialize the TargetInstrInfo from and
140 // we only need MCInstrInfo for asm parsing. We create one unconditionally
141 // because it's not subtarget dependent.
142 std::unique_ptr<MCInstrInfo> MII(TM.getTarget().createMCInstrInfo());
143 std::unique_ptr<MCTargetAsmParser> TAP(TM.getTarget().createMCAsmParser(
144 STI, *Parser, *MII, MCOptions));
145 if (!TAP)
146 report_fatal_error("Inline asm not supported by this streamer because"
147 " we don't have an asm parser for this target\n");
148 Parser->setAssemblerDialect(Dialect);
149 Parser->setTargetParser(*TAP.get());
150 Parser->setEnablePrintSchedInfo(EnablePrintSchedInfo);
151 if (Dialect == InlineAsm::AD_Intel)
152 // We need this flag to be able to parse numbers like "0bH"
153 Parser->setParsingInlineAsm(true);
154 if (MF) {
155 const TargetRegisterInfo *TRI = MF->getSubtarget().getRegisterInfo();
156 TAP->SetFrameRegister(TRI->getFrameRegister(*MF));
157 }
158
159 emitInlineAsmStart();
160 // Don't implicitly switch to the text section before the asm.
161 int Res = Parser->Run(/*NoInitialTextSection*/ true,
162 /*NoFinalize*/ true);
163 emitInlineAsmEnd(STI, &TAP->getSTI());
164
165 if (Res && !DiagInfo->DiagHandler)
166 report_fatal_error("Error parsing inline asm\n");
167 }
168
EmitMSInlineAsmStr(const char * AsmStr,const MachineInstr * MI,MachineModuleInfo * MMI,int InlineAsmVariant,AsmPrinter * AP,unsigned LocCookie,raw_ostream & OS)169 static void EmitMSInlineAsmStr(const char *AsmStr, const MachineInstr *MI,
170 MachineModuleInfo *MMI, int InlineAsmVariant,
171 AsmPrinter *AP, unsigned LocCookie,
172 raw_ostream &OS) {
173 // Switch to the inline assembly variant.
174 OS << "\t.intel_syntax\n\t";
175
176 const char *LastEmitted = AsmStr; // One past the last character emitted.
177 unsigned NumOperands = MI->getNumOperands();
178
179 while (*LastEmitted) {
180 switch (*LastEmitted) {
181 default: {
182 // Not a special case, emit the string section literally.
183 const char *LiteralEnd = LastEmitted+1;
184 while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
185 *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
186 ++LiteralEnd;
187
188 OS.write(LastEmitted, LiteralEnd-LastEmitted);
189 LastEmitted = LiteralEnd;
190 break;
191 }
192 case '\n':
193 ++LastEmitted; // Consume newline character.
194 OS << '\n'; // Indent code with newline.
195 break;
196 case '$': {
197 ++LastEmitted; // Consume '$' character.
198 bool Done = true;
199
200 // Handle escapes.
201 switch (*LastEmitted) {
202 default: Done = false; break;
203 case '$':
204 ++LastEmitted; // Consume second '$' character.
205 break;
206 }
207 if (Done) break;
208
209 // If we have ${:foo}, then this is not a real operand reference, it is a
210 // "magic" string reference, just like in .td files. Arrange to call
211 // PrintSpecial.
212 if (LastEmitted[0] == '{' && LastEmitted[1] == ':') {
213 LastEmitted += 2;
214 const char *StrStart = LastEmitted;
215 const char *StrEnd = strchr(StrStart, '}');
216 if (!StrEnd)
217 report_fatal_error("Unterminated ${:foo} operand in inline asm"
218 " string: '" + Twine(AsmStr) + "'");
219
220 std::string Val(StrStart, StrEnd);
221 AP->PrintSpecial(MI, OS, Val.c_str());
222 LastEmitted = StrEnd+1;
223 break;
224 }
225
226 const char *IDStart = LastEmitted;
227 const char *IDEnd = IDStart;
228 while (*IDEnd >= '0' && *IDEnd <= '9') ++IDEnd;
229
230 unsigned Val;
231 if (StringRef(IDStart, IDEnd-IDStart).getAsInteger(10, Val))
232 report_fatal_error("Bad $ operand number in inline asm string: '" +
233 Twine(AsmStr) + "'");
234 LastEmitted = IDEnd;
235
236 if (Val >= NumOperands-1)
237 report_fatal_error("Invalid $ operand number in inline asm string: '" +
238 Twine(AsmStr) + "'");
239
240 // Okay, we finally have a value number. Ask the target to print this
241 // operand!
242 unsigned OpNo = InlineAsm::MIOp_FirstOperand;
243
244 bool Error = false;
245
246 // Scan to find the machine operand number for the operand.
247 for (; Val; --Val) {
248 if (OpNo >= MI->getNumOperands()) break;
249 unsigned OpFlags = MI->getOperand(OpNo).getImm();
250 OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1;
251 }
252
253 // We may have a location metadata attached to the end of the
254 // instruction, and at no point should see metadata at any
255 // other point while processing. It's an error if so.
256 if (OpNo >= MI->getNumOperands() ||
257 MI->getOperand(OpNo).isMetadata()) {
258 Error = true;
259 } else {
260 unsigned OpFlags = MI->getOperand(OpNo).getImm();
261 ++OpNo; // Skip over the ID number.
262
263 if (InlineAsm::isMemKind(OpFlags)) {
264 Error = AP->PrintAsmMemoryOperand(MI, OpNo, InlineAsmVariant,
265 /*Modifier*/ nullptr, OS);
266 } else {
267 Error = AP->PrintAsmOperand(MI, OpNo, InlineAsmVariant,
268 /*Modifier*/ nullptr, OS);
269 }
270 }
271 if (Error) {
272 std::string msg;
273 raw_string_ostream Msg(msg);
274 Msg << "invalid operand in inline asm: '" << AsmStr << "'";
275 MMI->getModule()->getContext().emitError(LocCookie, Msg.str());
276 }
277 break;
278 }
279 }
280 }
281 OS << "\n\t.att_syntax\n" << (char)0; // null terminate string.
282 }
283
EmitGCCInlineAsmStr(const char * AsmStr,const MachineInstr * MI,MachineModuleInfo * MMI,int InlineAsmVariant,int AsmPrinterVariant,AsmPrinter * AP,unsigned LocCookie,raw_ostream & OS)284 static void EmitGCCInlineAsmStr(const char *AsmStr, const MachineInstr *MI,
285 MachineModuleInfo *MMI, int InlineAsmVariant,
286 int AsmPrinterVariant, AsmPrinter *AP,
287 unsigned LocCookie, raw_ostream &OS) {
288 int CurVariant = -1; // The number of the {.|.|.} region we are in.
289 const char *LastEmitted = AsmStr; // One past the last character emitted.
290 unsigned NumOperands = MI->getNumOperands();
291
292 OS << '\t';
293
294 while (*LastEmitted) {
295 switch (*LastEmitted) {
296 default: {
297 // Not a special case, emit the string section literally.
298 const char *LiteralEnd = LastEmitted+1;
299 while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
300 *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
301 ++LiteralEnd;
302 if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
303 OS.write(LastEmitted, LiteralEnd-LastEmitted);
304 LastEmitted = LiteralEnd;
305 break;
306 }
307 case '\n':
308 ++LastEmitted; // Consume newline character.
309 OS << '\n'; // Indent code with newline.
310 break;
311 case '$': {
312 ++LastEmitted; // Consume '$' character.
313 bool Done = true;
314
315 // Handle escapes.
316 switch (*LastEmitted) {
317 default: Done = false; break;
318 case '$': // $$ -> $
319 if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
320 OS << '$';
321 ++LastEmitted; // Consume second '$' character.
322 break;
323 case '(': // $( -> same as GCC's { character.
324 ++LastEmitted; // Consume '(' character.
325 if (CurVariant != -1)
326 report_fatal_error("Nested variants found in inline asm string: '" +
327 Twine(AsmStr) + "'");
328 CurVariant = 0; // We're in the first variant now.
329 break;
330 case '|':
331 ++LastEmitted; // consume '|' character.
332 if (CurVariant == -1)
333 OS << '|'; // this is gcc's behavior for | outside a variant
334 else
335 ++CurVariant; // We're in the next variant.
336 break;
337 case ')': // $) -> same as GCC's } char.
338 ++LastEmitted; // consume ')' character.
339 if (CurVariant == -1)
340 OS << '}'; // this is gcc's behavior for } outside a variant
341 else
342 CurVariant = -1;
343 break;
344 }
345 if (Done) break;
346
347 bool HasCurlyBraces = false;
348 if (*LastEmitted == '{') { // ${variable}
349 ++LastEmitted; // Consume '{' character.
350 HasCurlyBraces = true;
351 }
352
353 // If we have ${:foo}, then this is not a real operand reference, it is a
354 // "magic" string reference, just like in .td files. Arrange to call
355 // PrintSpecial.
356 if (HasCurlyBraces && *LastEmitted == ':') {
357 ++LastEmitted;
358 const char *StrStart = LastEmitted;
359 const char *StrEnd = strchr(StrStart, '}');
360 if (!StrEnd)
361 report_fatal_error("Unterminated ${:foo} operand in inline asm"
362 " string: '" + Twine(AsmStr) + "'");
363
364 std::string Val(StrStart, StrEnd);
365 AP->PrintSpecial(MI, OS, Val.c_str());
366 LastEmitted = StrEnd+1;
367 break;
368 }
369
370 const char *IDStart = LastEmitted;
371 const char *IDEnd = IDStart;
372 while (*IDEnd >= '0' && *IDEnd <= '9') ++IDEnd;
373
374 unsigned Val;
375 if (StringRef(IDStart, IDEnd-IDStart).getAsInteger(10, Val))
376 report_fatal_error("Bad $ operand number in inline asm string: '" +
377 Twine(AsmStr) + "'");
378 LastEmitted = IDEnd;
379
380 char Modifier[2] = { 0, 0 };
381
382 if (HasCurlyBraces) {
383 // If we have curly braces, check for a modifier character. This
384 // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
385 if (*LastEmitted == ':') {
386 ++LastEmitted; // Consume ':' character.
387 if (*LastEmitted == 0)
388 report_fatal_error("Bad ${:} expression in inline asm string: '" +
389 Twine(AsmStr) + "'");
390
391 Modifier[0] = *LastEmitted;
392 ++LastEmitted; // Consume modifier character.
393 }
394
395 if (*LastEmitted != '}')
396 report_fatal_error("Bad ${} expression in inline asm string: '" +
397 Twine(AsmStr) + "'");
398 ++LastEmitted; // Consume '}' character.
399 }
400
401 if (Val >= NumOperands-1)
402 report_fatal_error("Invalid $ operand number in inline asm string: '" +
403 Twine(AsmStr) + "'");
404
405 // Okay, we finally have a value number. Ask the target to print this
406 // operand!
407 if (CurVariant == -1 || CurVariant == AsmPrinterVariant) {
408 unsigned OpNo = InlineAsm::MIOp_FirstOperand;
409
410 bool Error = false;
411
412 // Scan to find the machine operand number for the operand.
413 for (; Val; --Val) {
414 if (OpNo >= MI->getNumOperands()) break;
415 unsigned OpFlags = MI->getOperand(OpNo).getImm();
416 OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1;
417 }
418
419 // We may have a location metadata attached to the end of the
420 // instruction, and at no point should see metadata at any
421 // other point while processing. It's an error if so.
422 if (OpNo >= MI->getNumOperands() ||
423 MI->getOperand(OpNo).isMetadata()) {
424 Error = true;
425 } else {
426 unsigned OpFlags = MI->getOperand(OpNo).getImm();
427 ++OpNo; // Skip over the ID number.
428
429 if (Modifier[0] == 'l') { // Labels are target independent.
430 // FIXME: What if the operand isn't an MBB, report error?
431 const MCSymbol *Sym = MI->getOperand(OpNo).getMBB()->getSymbol();
432 Sym->print(OS, AP->MAI);
433 } else {
434 if (InlineAsm::isMemKind(OpFlags)) {
435 Error = AP->PrintAsmMemoryOperand(MI, OpNo, InlineAsmVariant,
436 Modifier[0] ? Modifier : nullptr,
437 OS);
438 } else {
439 Error = AP->PrintAsmOperand(MI, OpNo, InlineAsmVariant,
440 Modifier[0] ? Modifier : nullptr, OS);
441 }
442 }
443 }
444 if (Error) {
445 std::string msg;
446 raw_string_ostream Msg(msg);
447 Msg << "invalid operand in inline asm: '" << AsmStr << "'";
448 MMI->getModule()->getContext().emitError(LocCookie, Msg.str());
449 }
450 }
451 break;
452 }
453 }
454 }
455 OS << '\n' << (char)0; // null terminate string.
456 }
457
458 /// EmitInlineAsm - This method formats and emits the specified machine
459 /// instruction that is an inline asm.
EmitInlineAsm(const MachineInstr * MI) const460 void AsmPrinter::EmitInlineAsm(const MachineInstr *MI) const {
461 assert(MI->isInlineAsm() && "printInlineAsm only works on inline asms");
462
463 // Count the number of register definitions to find the asm string.
464 unsigned NumDefs = 0;
465 for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef();
466 ++NumDefs)
467 assert(NumDefs != MI->getNumOperands()-2 && "No asm string?");
468
469 assert(MI->getOperand(NumDefs).isSymbol() && "No asm string?");
470
471 // Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
472 const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
473
474 // If this asmstr is empty, just print the #APP/#NOAPP markers.
475 // These are useful to see where empty asm's wound up.
476 if (AsmStr[0] == 0) {
477 OutStreamer->emitRawComment(MAI->getInlineAsmStart());
478 OutStreamer->emitRawComment(MAI->getInlineAsmEnd());
479 return;
480 }
481
482 // Emit the #APP start marker. This has to happen even if verbose-asm isn't
483 // enabled, so we use emitRawComment.
484 OutStreamer->emitRawComment(MAI->getInlineAsmStart());
485
486 // Get the !srcloc metadata node if we have it, and decode the loc cookie from
487 // it.
488 unsigned LocCookie = 0;
489 const MDNode *LocMD = nullptr;
490 for (unsigned i = MI->getNumOperands(); i != 0; --i) {
491 if (MI->getOperand(i-1).isMetadata() &&
492 (LocMD = MI->getOperand(i-1).getMetadata()) &&
493 LocMD->getNumOperands() != 0) {
494 if (const ConstantInt *CI =
495 mdconst::dyn_extract<ConstantInt>(LocMD->getOperand(0))) {
496 LocCookie = CI->getZExtValue();
497 break;
498 }
499 }
500 }
501
502 // Emit the inline asm to a temporary string so we can emit it through
503 // EmitInlineAsm.
504 SmallString<256> StringData;
505 raw_svector_ostream OS(StringData);
506
507 // The variant of the current asmprinter.
508 int AsmPrinterVariant = MAI->getAssemblerDialect();
509 InlineAsm::AsmDialect InlineAsmVariant = MI->getInlineAsmDialect();
510 AsmPrinter *AP = const_cast<AsmPrinter*>(this);
511 if (InlineAsmVariant == InlineAsm::AD_ATT)
512 EmitGCCInlineAsmStr(AsmStr, MI, MMI, InlineAsmVariant, AsmPrinterVariant,
513 AP, LocCookie, OS);
514 else
515 EmitMSInlineAsmStr(AsmStr, MI, MMI, InlineAsmVariant, AP, LocCookie, OS);
516
517 // Reset SanitizeAddress based on the function's attribute.
518 MCTargetOptions MCOptions = TM.Options.MCOptions;
519 MCOptions.SanitizeAddress =
520 MF->getFunction().hasFnAttribute(Attribute::SanitizeAddress);
521
522 EmitInlineAsm(OS.str(), getSubtargetInfo(), MCOptions, LocMD,
523 MI->getInlineAsmDialect());
524
525 // Emit the #NOAPP end marker. This has to happen even if verbose-asm isn't
526 // enabled, so we use emitRawComment.
527 OutStreamer->emitRawComment(MAI->getInlineAsmEnd());
528 }
529
530
531 /// PrintSpecial - Print information related to the specified machine instr
532 /// that is independent of the operand, and may be independent of the instr
533 /// itself. This can be useful for portably encoding the comment character
534 /// or other bits of target-specific knowledge into the asmstrings. The
535 /// syntax used is ${:comment}. Targets can override this to add support
536 /// for their own strange codes.
PrintSpecial(const MachineInstr * MI,raw_ostream & OS,const char * Code) const537 void AsmPrinter::PrintSpecial(const MachineInstr *MI, raw_ostream &OS,
538 const char *Code) const {
539 if (!strcmp(Code, "private")) {
540 const DataLayout &DL = MF->getDataLayout();
541 OS << DL.getPrivateGlobalPrefix();
542 } else if (!strcmp(Code, "comment")) {
543 OS << MAI->getCommentString();
544 } else if (!strcmp(Code, "uid")) {
545 // Comparing the address of MI isn't sufficient, because machineinstrs may
546 // be allocated to the same address across functions.
547
548 // If this is a new LastFn instruction, bump the counter.
549 if (LastMI != MI || LastFn != getFunctionNumber()) {
550 ++Counter;
551 LastMI = MI;
552 LastFn = getFunctionNumber();
553 }
554 OS << Counter;
555 } else {
556 std::string msg;
557 raw_string_ostream Msg(msg);
558 Msg << "Unknown special formatter '" << Code
559 << "' for machine instr: " << *MI;
560 report_fatal_error(Msg.str());
561 }
562 }
563
564 /// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
565 /// instruction, using the specified assembler variant. Targets should
566 /// override this to format as appropriate.
PrintAsmOperand(const MachineInstr * MI,unsigned OpNo,unsigned AsmVariant,const char * ExtraCode,raw_ostream & O)567 bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
568 unsigned AsmVariant, const char *ExtraCode,
569 raw_ostream &O) {
570 // Does this asm operand have a single letter operand modifier?
571 if (ExtraCode && ExtraCode[0]) {
572 if (ExtraCode[1] != 0) return true; // Unknown modifier.
573
574 const MachineOperand &MO = MI->getOperand(OpNo);
575 switch (ExtraCode[0]) {
576 default:
577 return true; // Unknown modifier.
578 case 'c': // Substitute immediate value without immediate syntax
579 if (MO.getType() != MachineOperand::MO_Immediate)
580 return true;
581 O << MO.getImm();
582 return false;
583 case 'n': // Negate the immediate constant.
584 if (MO.getType() != MachineOperand::MO_Immediate)
585 return true;
586 O << -MO.getImm();
587 return false;
588 case 's': // The GCC deprecated s modifier
589 if (MO.getType() != MachineOperand::MO_Immediate)
590 return true;
591 O << ((32 - MO.getImm()) & 31);
592 return false;
593 }
594 }
595 return true;
596 }
597
PrintAsmMemoryOperand(const MachineInstr * MI,unsigned OpNo,unsigned AsmVariant,const char * ExtraCode,raw_ostream & O)598 bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
599 unsigned AsmVariant,
600 const char *ExtraCode, raw_ostream &O) {
601 // Target doesn't support this yet!
602 return true;
603 }
604
emitInlineAsmStart() const605 void AsmPrinter::emitInlineAsmStart() const {}
606
emitInlineAsmEnd(const MCSubtargetInfo & StartInfo,const MCSubtargetInfo * EndInfo) const607 void AsmPrinter::emitInlineAsmEnd(const MCSubtargetInfo &StartInfo,
608 const MCSubtargetInfo *EndInfo) const {}
609