1 //===--- TargetInfo.cpp - Information about Target machine ----------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file implements the TargetInfo and TargetInfoImpl interfaces.
10 //
11 //===----------------------------------------------------------------------===//
12
13 #include "clang/Basic/TargetInfo.h"
14 #include "clang/Basic/AddressSpaces.h"
15 #include "clang/Basic/CharInfo.h"
16 #include "clang/Basic/Diagnostic.h"
17 #include "clang/Basic/LangOptions.h"
18 #include "llvm/ADT/APFloat.h"
19 #include "llvm/ADT/STLExtras.h"
20 #include "llvm/Support/ErrorHandling.h"
21 #include "llvm/Support/TargetParser.h"
22 #include <cstdlib>
23 using namespace clang;
24
25 static const LangASMap DefaultAddrSpaceMap = {0};
26
27 // TargetInfo Constructor.
TargetInfo(const llvm::Triple & T)28 TargetInfo::TargetInfo(const llvm::Triple &T) : TargetOpts(), Triple(T) {
29 // Set defaults. Defaults are set for a 32-bit RISC platform, like PPC or
30 // SPARC. These should be overridden by concrete targets as needed.
31 BigEndian = !T.isLittleEndian();
32 TLSSupported = true;
33 VLASupported = true;
34 NoAsmVariants = false;
35 HasLegalHalfType = false;
36 HasFloat128 = false;
37 HasFloat16 = false;
38 HasBFloat16 = false;
39 HasStrictFP = false;
40 PointerWidth = PointerAlign = 32;
41 BoolWidth = BoolAlign = 8;
42 IntWidth = IntAlign = 32;
43 LongWidth = LongAlign = 32;
44 LongLongWidth = LongLongAlign = 64;
45
46 // Fixed point default bit widths
47 ShortAccumWidth = ShortAccumAlign = 16;
48 AccumWidth = AccumAlign = 32;
49 LongAccumWidth = LongAccumAlign = 64;
50 ShortFractWidth = ShortFractAlign = 8;
51 FractWidth = FractAlign = 16;
52 LongFractWidth = LongFractAlign = 32;
53
54 // Fixed point default integral and fractional bit sizes
55 // We give the _Accum 1 fewer fractional bits than their corresponding _Fract
56 // types by default to have the same number of fractional bits between _Accum
57 // and _Fract types.
58 PaddingOnUnsignedFixedPoint = false;
59 ShortAccumScale = 7;
60 AccumScale = 15;
61 LongAccumScale = 31;
62
63 SuitableAlign = 64;
64 DefaultAlignForAttributeAligned = 128;
65 MinGlobalAlign = 0;
66 // From the glibc documentation, on GNU systems, malloc guarantees 16-byte
67 // alignment on 64-bit systems and 8-byte alignment on 32-bit systems. See
68 // https://www.gnu.org/software/libc/manual/html_node/Malloc-Examples.html.
69 // This alignment guarantee also applies to Windows and Android. On Darwin,
70 // the alignment is 16 bytes on both 64-bit and 32-bit systems.
71 if (T.isGNUEnvironment() || T.isWindowsMSVCEnvironment() || T.isAndroid())
72 NewAlign = Triple.isArch64Bit() ? 128 : Triple.isArch32Bit() ? 64 : 0;
73 else if (T.isOSDarwin())
74 NewAlign = 128;
75 else
76 NewAlign = 0; // Infer from basic type alignment.
77 HalfWidth = 16;
78 HalfAlign = 16;
79 FloatWidth = 32;
80 FloatAlign = 32;
81 DoubleWidth = 64;
82 DoubleAlign = 64;
83 LongDoubleWidth = 64;
84 LongDoubleAlign = 64;
85 Float128Align = 128;
86 LargeArrayMinWidth = 0;
87 LargeArrayAlign = 0;
88 MaxAtomicPromoteWidth = MaxAtomicInlineWidth = 0;
89 MaxVectorAlign = 0;
90 MaxTLSAlign = 0;
91 SimdDefaultAlign = 0;
92 SizeType = UnsignedLong;
93 PtrDiffType = SignedLong;
94 IntMaxType = SignedLongLong;
95 IntPtrType = SignedLong;
96 WCharType = SignedInt;
97 WIntType = SignedInt;
98 Char16Type = UnsignedShort;
99 Char32Type = UnsignedInt;
100 Int64Type = SignedLongLong;
101 Int16Type = SignedShort;
102 SigAtomicType = SignedInt;
103 ProcessIDType = SignedInt;
104 UseSignedCharForObjCBool = true;
105 UseBitFieldTypeAlignment = true;
106 UseZeroLengthBitfieldAlignment = false;
107 UseLeadingZeroLengthBitfield = true;
108 UseExplicitBitFieldAlignment = true;
109 ZeroLengthBitfieldBoundary = 0;
110 MaxAlignedAttribute = 0;
111 HalfFormat = &llvm::APFloat::IEEEhalf();
112 FloatFormat = &llvm::APFloat::IEEEsingle();
113 DoubleFormat = &llvm::APFloat::IEEEdouble();
114 LongDoubleFormat = &llvm::APFloat::IEEEdouble();
115 Float128Format = &llvm::APFloat::IEEEquad();
116 MCountName = "mcount";
117 UserLabelPrefix = "_";
118 RegParmMax = 0;
119 SSERegParmMax = 0;
120 HasAlignMac68kSupport = false;
121 HasBuiltinMSVaList = false;
122 IsRenderScriptTarget = false;
123 HasAArch64SVETypes = false;
124 HasRISCVVTypes = false;
125 AllowAMDGPUUnsafeFPAtomics = false;
126 ARMCDECoprocMask = 0;
127
128 // Default to no types using fpret.
129 RealTypeUsesObjCFPRet = 0;
130
131 // Default to not using fp2ret for __Complex long double
132 ComplexLongDoubleUsesFP2Ret = false;
133
134 // Set the C++ ABI based on the triple.
135 TheCXXABI.set(Triple.isKnownWindowsMSVCEnvironment()
136 ? TargetCXXABI::Microsoft
137 : TargetCXXABI::GenericItanium);
138
139 // Default to an empty address space map.
140 AddrSpaceMap = &DefaultAddrSpaceMap;
141 UseAddrSpaceMapMangling = false;
142
143 // Default to an unknown platform name.
144 PlatformName = "unknown";
145 PlatformMinVersion = VersionTuple();
146
147 MaxOpenCLWorkGroupSize = 1024;
148 }
149
150 // Out of line virtual dtor for TargetInfo.
~TargetInfo()151 TargetInfo::~TargetInfo() {}
152
resetDataLayout(StringRef DL,const char * ULP)153 void TargetInfo::resetDataLayout(StringRef DL, const char *ULP) {
154 DataLayoutString = DL.str();
155 UserLabelPrefix = ULP;
156 }
157
158 bool
checkCFProtectionBranchSupported(DiagnosticsEngine & Diags) const159 TargetInfo::checkCFProtectionBranchSupported(DiagnosticsEngine &Diags) const {
160 Diags.Report(diag::err_opt_not_valid_on_target) << "cf-protection=branch";
161 return false;
162 }
163
164 bool
checkCFProtectionReturnSupported(DiagnosticsEngine & Diags) const165 TargetInfo::checkCFProtectionReturnSupported(DiagnosticsEngine &Diags) const {
166 Diags.Report(diag::err_opt_not_valid_on_target) << "cf-protection=return";
167 return false;
168 }
169
170 /// getTypeName - Return the user string for the specified integer type enum.
171 /// For example, SignedShort -> "short".
getTypeName(IntType T)172 const char *TargetInfo::getTypeName(IntType T) {
173 switch (T) {
174 default: llvm_unreachable("not an integer!");
175 case SignedChar: return "signed char";
176 case UnsignedChar: return "unsigned char";
177 case SignedShort: return "short";
178 case UnsignedShort: return "unsigned short";
179 case SignedInt: return "int";
180 case UnsignedInt: return "unsigned int";
181 case SignedLong: return "long int";
182 case UnsignedLong: return "long unsigned int";
183 case SignedLongLong: return "long long int";
184 case UnsignedLongLong: return "long long unsigned int";
185 }
186 }
187
188 /// getTypeConstantSuffix - Return the constant suffix for the specified
189 /// integer type enum. For example, SignedLong -> "L".
getTypeConstantSuffix(IntType T) const190 const char *TargetInfo::getTypeConstantSuffix(IntType T) const {
191 switch (T) {
192 default: llvm_unreachable("not an integer!");
193 case SignedChar:
194 case SignedShort:
195 case SignedInt: return "";
196 case SignedLong: return "L";
197 case SignedLongLong: return "LL";
198 case UnsignedChar:
199 if (getCharWidth() < getIntWidth())
200 return "";
201 LLVM_FALLTHROUGH;
202 case UnsignedShort:
203 if (getShortWidth() < getIntWidth())
204 return "";
205 LLVM_FALLTHROUGH;
206 case UnsignedInt: return "U";
207 case UnsignedLong: return "UL";
208 case UnsignedLongLong: return "ULL";
209 }
210 }
211
212 /// getTypeFormatModifier - Return the printf format modifier for the
213 /// specified integer type enum. For example, SignedLong -> "l".
214
getTypeFormatModifier(IntType T)215 const char *TargetInfo::getTypeFormatModifier(IntType T) {
216 switch (T) {
217 default: llvm_unreachable("not an integer!");
218 case SignedChar:
219 case UnsignedChar: return "hh";
220 case SignedShort:
221 case UnsignedShort: return "h";
222 case SignedInt:
223 case UnsignedInt: return "";
224 case SignedLong:
225 case UnsignedLong: return "l";
226 case SignedLongLong:
227 case UnsignedLongLong: return "ll";
228 }
229 }
230
231 /// getTypeWidth - Return the width (in bits) of the specified integer type
232 /// enum. For example, SignedInt -> getIntWidth().
getTypeWidth(IntType T) const233 unsigned TargetInfo::getTypeWidth(IntType T) const {
234 switch (T) {
235 default: llvm_unreachable("not an integer!");
236 case SignedChar:
237 case UnsignedChar: return getCharWidth();
238 case SignedShort:
239 case UnsignedShort: return getShortWidth();
240 case SignedInt:
241 case UnsignedInt: return getIntWidth();
242 case SignedLong:
243 case UnsignedLong: return getLongWidth();
244 case SignedLongLong:
245 case UnsignedLongLong: return getLongLongWidth();
246 };
247 }
248
getIntTypeByWidth(unsigned BitWidth,bool IsSigned) const249 TargetInfo::IntType TargetInfo::getIntTypeByWidth(
250 unsigned BitWidth, bool IsSigned) const {
251 if (getCharWidth() == BitWidth)
252 return IsSigned ? SignedChar : UnsignedChar;
253 if (getShortWidth() == BitWidth)
254 return IsSigned ? SignedShort : UnsignedShort;
255 if (getIntWidth() == BitWidth)
256 return IsSigned ? SignedInt : UnsignedInt;
257 if (getLongWidth() == BitWidth)
258 return IsSigned ? SignedLong : UnsignedLong;
259 if (getLongLongWidth() == BitWidth)
260 return IsSigned ? SignedLongLong : UnsignedLongLong;
261 return NoInt;
262 }
263
getLeastIntTypeByWidth(unsigned BitWidth,bool IsSigned) const264 TargetInfo::IntType TargetInfo::getLeastIntTypeByWidth(unsigned BitWidth,
265 bool IsSigned) const {
266 if (getCharWidth() >= BitWidth)
267 return IsSigned ? SignedChar : UnsignedChar;
268 if (getShortWidth() >= BitWidth)
269 return IsSigned ? SignedShort : UnsignedShort;
270 if (getIntWidth() >= BitWidth)
271 return IsSigned ? SignedInt : UnsignedInt;
272 if (getLongWidth() >= BitWidth)
273 return IsSigned ? SignedLong : UnsignedLong;
274 if (getLongLongWidth() >= BitWidth)
275 return IsSigned ? SignedLongLong : UnsignedLongLong;
276 return NoInt;
277 }
278
getRealTypeByWidth(unsigned BitWidth,bool ExplicitIEEE) const279 TargetInfo::RealType TargetInfo::getRealTypeByWidth(unsigned BitWidth,
280 bool ExplicitIEEE) const {
281 if (getFloatWidth() == BitWidth)
282 return Float;
283 if (getDoubleWidth() == BitWidth)
284 return Double;
285
286 switch (BitWidth) {
287 case 96:
288 if (&getLongDoubleFormat() == &llvm::APFloat::x87DoubleExtended())
289 return LongDouble;
290 break;
291 case 128:
292 // The caller explicitly asked for an IEEE compliant type but we still
293 // have to check if the target supports it.
294 if (ExplicitIEEE)
295 return hasFloat128Type() ? Float128 : NoFloat;
296 if (&getLongDoubleFormat() == &llvm::APFloat::PPCDoubleDouble() ||
297 &getLongDoubleFormat() == &llvm::APFloat::IEEEquad())
298 return LongDouble;
299 if (hasFloat128Type())
300 return Float128;
301 break;
302 }
303
304 return NoFloat;
305 }
306
307 /// getTypeAlign - Return the alignment (in bits) of the specified integer type
308 /// enum. For example, SignedInt -> getIntAlign().
getTypeAlign(IntType T) const309 unsigned TargetInfo::getTypeAlign(IntType T) const {
310 switch (T) {
311 default: llvm_unreachable("not an integer!");
312 case SignedChar:
313 case UnsignedChar: return getCharAlign();
314 case SignedShort:
315 case UnsignedShort: return getShortAlign();
316 case SignedInt:
317 case UnsignedInt: return getIntAlign();
318 case SignedLong:
319 case UnsignedLong: return getLongAlign();
320 case SignedLongLong:
321 case UnsignedLongLong: return getLongLongAlign();
322 };
323 }
324
325 /// isTypeSigned - Return whether an integer types is signed. Returns true if
326 /// the type is signed; false otherwise.
isTypeSigned(IntType T)327 bool TargetInfo::isTypeSigned(IntType T) {
328 switch (T) {
329 default: llvm_unreachable("not an integer!");
330 case SignedChar:
331 case SignedShort:
332 case SignedInt:
333 case SignedLong:
334 case SignedLongLong:
335 return true;
336 case UnsignedChar:
337 case UnsignedShort:
338 case UnsignedInt:
339 case UnsignedLong:
340 case UnsignedLongLong:
341 return false;
342 };
343 }
344
345 /// adjust - Set forced language options.
346 /// Apply changes to the target information with respect to certain
347 /// language options which change the target configuration and adjust
348 /// the language based on the target options where applicable.
adjust(LangOptions & Opts)349 void TargetInfo::adjust(LangOptions &Opts) {
350 if (Opts.NoBitFieldTypeAlign)
351 UseBitFieldTypeAlignment = false;
352
353 switch (Opts.WCharSize) {
354 default: llvm_unreachable("invalid wchar_t width");
355 case 0: break;
356 case 1: WCharType = Opts.WCharIsSigned ? SignedChar : UnsignedChar; break;
357 case 2: WCharType = Opts.WCharIsSigned ? SignedShort : UnsignedShort; break;
358 case 4: WCharType = Opts.WCharIsSigned ? SignedInt : UnsignedInt; break;
359 }
360
361 if (Opts.AlignDouble) {
362 DoubleAlign = LongLongAlign = 64;
363 LongDoubleAlign = 64;
364 }
365
366 if (Opts.OpenCL) {
367 // OpenCL C requires specific widths for types, irrespective of
368 // what these normally are for the target.
369 // We also define long long and long double here, although the
370 // OpenCL standard only mentions these as "reserved".
371 IntWidth = IntAlign = 32;
372 LongWidth = LongAlign = 64;
373 LongLongWidth = LongLongAlign = 128;
374 HalfWidth = HalfAlign = 16;
375 FloatWidth = FloatAlign = 32;
376
377 // Embedded 32-bit targets (OpenCL EP) might have double C type
378 // defined as float. Let's not override this as it might lead
379 // to generating illegal code that uses 64bit doubles.
380 if (DoubleWidth != FloatWidth) {
381 DoubleWidth = DoubleAlign = 64;
382 DoubleFormat = &llvm::APFloat::IEEEdouble();
383 }
384 LongDoubleWidth = LongDoubleAlign = 128;
385
386 unsigned MaxPointerWidth = getMaxPointerWidth();
387 assert(MaxPointerWidth == 32 || MaxPointerWidth == 64);
388 bool Is32BitArch = MaxPointerWidth == 32;
389 SizeType = Is32BitArch ? UnsignedInt : UnsignedLong;
390 PtrDiffType = Is32BitArch ? SignedInt : SignedLong;
391 IntPtrType = Is32BitArch ? SignedInt : SignedLong;
392
393 IntMaxType = SignedLongLong;
394 Int64Type = SignedLong;
395
396 HalfFormat = &llvm::APFloat::IEEEhalf();
397 FloatFormat = &llvm::APFloat::IEEEsingle();
398 LongDoubleFormat = &llvm::APFloat::IEEEquad();
399 }
400
401 if (Opts.DoubleSize) {
402 if (Opts.DoubleSize == 32) {
403 DoubleWidth = 32;
404 LongDoubleWidth = 32;
405 DoubleFormat = &llvm::APFloat::IEEEsingle();
406 LongDoubleFormat = &llvm::APFloat::IEEEsingle();
407 } else if (Opts.DoubleSize == 64) {
408 DoubleWidth = 64;
409 LongDoubleWidth = 64;
410 DoubleFormat = &llvm::APFloat::IEEEdouble();
411 LongDoubleFormat = &llvm::APFloat::IEEEdouble();
412 }
413 }
414
415 if (Opts.LongDoubleSize) {
416 if (Opts.LongDoubleSize == DoubleWidth) {
417 LongDoubleWidth = DoubleWidth;
418 LongDoubleAlign = DoubleAlign;
419 LongDoubleFormat = DoubleFormat;
420 } else if (Opts.LongDoubleSize == 128) {
421 LongDoubleWidth = LongDoubleAlign = 128;
422 LongDoubleFormat = &llvm::APFloat::IEEEquad();
423 }
424 }
425
426 if (Opts.NewAlignOverride)
427 NewAlign = Opts.NewAlignOverride * getCharWidth();
428
429 // Each unsigned fixed point type has the same number of fractional bits as
430 // its corresponding signed type.
431 PaddingOnUnsignedFixedPoint |= Opts.PaddingOnUnsignedFixedPoint;
432 CheckFixedPointBits();
433 }
434
initFeatureMap(llvm::StringMap<bool> & Features,DiagnosticsEngine & Diags,StringRef CPU,const std::vector<std::string> & FeatureVec) const435 bool TargetInfo::initFeatureMap(
436 llvm::StringMap<bool> &Features, DiagnosticsEngine &Diags, StringRef CPU,
437 const std::vector<std::string> &FeatureVec) const {
438 for (const auto &F : FeatureVec) {
439 StringRef Name = F;
440 // Apply the feature via the target.
441 bool Enabled = Name[0] == '+';
442 setFeatureEnabled(Features, Name.substr(1), Enabled);
443 }
444 return true;
445 }
446
447 TargetInfo::CallingConvKind
getCallingConvKind(bool ClangABICompat4) const448 TargetInfo::getCallingConvKind(bool ClangABICompat4) const {
449 if (getCXXABI() != TargetCXXABI::Microsoft &&
450 (ClangABICompat4 || getTriple().getOS() == llvm::Triple::PS4))
451 return CCK_ClangABI4OrPS4;
452 return CCK_Default;
453 }
454
getOpenCLTypeAddrSpace(OpenCLTypeKind TK) const455 LangAS TargetInfo::getOpenCLTypeAddrSpace(OpenCLTypeKind TK) const {
456 switch (TK) {
457 case OCLTK_Image:
458 case OCLTK_Pipe:
459 return LangAS::opencl_global;
460
461 case OCLTK_Sampler:
462 return LangAS::opencl_constant;
463
464 default:
465 return LangAS::Default;
466 }
467 }
468
469 //===----------------------------------------------------------------------===//
470
471
removeGCCRegisterPrefix(StringRef Name)472 static StringRef removeGCCRegisterPrefix(StringRef Name) {
473 if (Name[0] == '%' || Name[0] == '#')
474 Name = Name.substr(1);
475
476 return Name;
477 }
478
479 /// isValidClobber - Returns whether the passed in string is
480 /// a valid clobber in an inline asm statement. This is used by
481 /// Sema.
isValidClobber(StringRef Name) const482 bool TargetInfo::isValidClobber(StringRef Name) const {
483 return (isValidGCCRegisterName(Name) || Name == "memory" || Name == "cc" ||
484 Name == "unwind");
485 }
486
487 /// isValidGCCRegisterName - Returns whether the passed in string
488 /// is a valid register name according to GCC. This is used by Sema for
489 /// inline asm statements.
isValidGCCRegisterName(StringRef Name) const490 bool TargetInfo::isValidGCCRegisterName(StringRef Name) const {
491 if (Name.empty())
492 return false;
493
494 // Get rid of any register prefix.
495 Name = removeGCCRegisterPrefix(Name);
496 if (Name.empty())
497 return false;
498
499 ArrayRef<const char *> Names = getGCCRegNames();
500
501 // If we have a number it maps to an entry in the register name array.
502 if (isDigit(Name[0])) {
503 unsigned n;
504 if (!Name.getAsInteger(0, n))
505 return n < Names.size();
506 }
507
508 // Check register names.
509 if (llvm::is_contained(Names, Name))
510 return true;
511
512 // Check any additional names that we have.
513 for (const AddlRegName &ARN : getGCCAddlRegNames())
514 for (const char *AN : ARN.Names) {
515 if (!AN)
516 break;
517 // Make sure the register that the additional name is for is within
518 // the bounds of the register names from above.
519 if (AN == Name && ARN.RegNum < Names.size())
520 return true;
521 }
522
523 // Now check aliases.
524 for (const GCCRegAlias &GRA : getGCCRegAliases())
525 for (const char *A : GRA.Aliases) {
526 if (!A)
527 break;
528 if (A == Name)
529 return true;
530 }
531
532 return false;
533 }
534
getNormalizedGCCRegisterName(StringRef Name,bool ReturnCanonical) const535 StringRef TargetInfo::getNormalizedGCCRegisterName(StringRef Name,
536 bool ReturnCanonical) const {
537 assert(isValidGCCRegisterName(Name) && "Invalid register passed in");
538
539 // Get rid of any register prefix.
540 Name = removeGCCRegisterPrefix(Name);
541
542 ArrayRef<const char *> Names = getGCCRegNames();
543
544 // First, check if we have a number.
545 if (isDigit(Name[0])) {
546 unsigned n;
547 if (!Name.getAsInteger(0, n)) {
548 assert(n < Names.size() && "Out of bounds register number!");
549 return Names[n];
550 }
551 }
552
553 // Check any additional names that we have.
554 for (const AddlRegName &ARN : getGCCAddlRegNames())
555 for (const char *AN : ARN.Names) {
556 if (!AN)
557 break;
558 // Make sure the register that the additional name is for is within
559 // the bounds of the register names from above.
560 if (AN == Name && ARN.RegNum < Names.size())
561 return ReturnCanonical ? Names[ARN.RegNum] : Name;
562 }
563
564 // Now check aliases.
565 for (const GCCRegAlias &RA : getGCCRegAliases())
566 for (const char *A : RA.Aliases) {
567 if (!A)
568 break;
569 if (A == Name)
570 return RA.Register;
571 }
572
573 return Name;
574 }
575
validateOutputConstraint(ConstraintInfo & Info) const576 bool TargetInfo::validateOutputConstraint(ConstraintInfo &Info) const {
577 const char *Name = Info.getConstraintStr().c_str();
578 // An output constraint must start with '=' or '+'
579 if (*Name != '=' && *Name != '+')
580 return false;
581
582 if (*Name == '+')
583 Info.setIsReadWrite();
584
585 Name++;
586 while (*Name) {
587 switch (*Name) {
588 default:
589 if (!validateAsmConstraint(Name, Info)) {
590 // FIXME: We temporarily return false
591 // so we can add more constraints as we hit it.
592 // Eventually, an unknown constraint should just be treated as 'g'.
593 return false;
594 }
595 break;
596 case '&': // early clobber.
597 Info.setEarlyClobber();
598 break;
599 case '%': // commutative.
600 // FIXME: Check that there is a another register after this one.
601 break;
602 case 'r': // general register.
603 Info.setAllowsRegister();
604 break;
605 case 'm': // memory operand.
606 case 'o': // offsetable memory operand.
607 case 'V': // non-offsetable memory operand.
608 case '<': // autodecrement memory operand.
609 case '>': // autoincrement memory operand.
610 Info.setAllowsMemory();
611 break;
612 case 'g': // general register, memory operand or immediate integer.
613 case 'X': // any operand.
614 Info.setAllowsRegister();
615 Info.setAllowsMemory();
616 break;
617 case ',': // multiple alternative constraint. Pass it.
618 // Handle additional optional '=' or '+' modifiers.
619 if (Name[1] == '=' || Name[1] == '+')
620 Name++;
621 break;
622 case '#': // Ignore as constraint.
623 while (Name[1] && Name[1] != ',')
624 Name++;
625 break;
626 case '?': // Disparage slightly code.
627 case '!': // Disparage severely.
628 case '*': // Ignore for choosing register preferences.
629 case 'i': // Ignore i,n,E,F as output constraints (match from the other
630 // chars)
631 case 'n':
632 case 'E':
633 case 'F':
634 break; // Pass them.
635 }
636
637 Name++;
638 }
639
640 // Early clobber with a read-write constraint which doesn't permit registers
641 // is invalid.
642 if (Info.earlyClobber() && Info.isReadWrite() && !Info.allowsRegister())
643 return false;
644
645 // If a constraint allows neither memory nor register operands it contains
646 // only modifiers. Reject it.
647 return Info.allowsMemory() || Info.allowsRegister();
648 }
649
resolveSymbolicName(const char * & Name,ArrayRef<ConstraintInfo> OutputConstraints,unsigned & Index) const650 bool TargetInfo::resolveSymbolicName(const char *&Name,
651 ArrayRef<ConstraintInfo> OutputConstraints,
652 unsigned &Index) const {
653 assert(*Name == '[' && "Symbolic name did not start with '['");
654 Name++;
655 const char *Start = Name;
656 while (*Name && *Name != ']')
657 Name++;
658
659 if (!*Name) {
660 // Missing ']'
661 return false;
662 }
663
664 std::string SymbolicName(Start, Name - Start);
665
666 for (Index = 0; Index != OutputConstraints.size(); ++Index)
667 if (SymbolicName == OutputConstraints[Index].getName())
668 return true;
669
670 return false;
671 }
672
validateInputConstraint(MutableArrayRef<ConstraintInfo> OutputConstraints,ConstraintInfo & Info) const673 bool TargetInfo::validateInputConstraint(
674 MutableArrayRef<ConstraintInfo> OutputConstraints,
675 ConstraintInfo &Info) const {
676 const char *Name = Info.ConstraintStr.c_str();
677
678 if (!*Name)
679 return false;
680
681 while (*Name) {
682 switch (*Name) {
683 default:
684 // Check if we have a matching constraint
685 if (*Name >= '0' && *Name <= '9') {
686 const char *DigitStart = Name;
687 while (Name[1] >= '0' && Name[1] <= '9')
688 Name++;
689 const char *DigitEnd = Name;
690 unsigned i;
691 if (StringRef(DigitStart, DigitEnd - DigitStart + 1)
692 .getAsInteger(10, i))
693 return false;
694
695 // Check if matching constraint is out of bounds.
696 if (i >= OutputConstraints.size()) return false;
697
698 // A number must refer to an output only operand.
699 if (OutputConstraints[i].isReadWrite())
700 return false;
701
702 // If the constraint is already tied, it must be tied to the
703 // same operand referenced to by the number.
704 if (Info.hasTiedOperand() && Info.getTiedOperand() != i)
705 return false;
706
707 // The constraint should have the same info as the respective
708 // output constraint.
709 Info.setTiedOperand(i, OutputConstraints[i]);
710 } else if (!validateAsmConstraint(Name, Info)) {
711 // FIXME: This error return is in place temporarily so we can
712 // add more constraints as we hit it. Eventually, an unknown
713 // constraint should just be treated as 'g'.
714 return false;
715 }
716 break;
717 case '[': {
718 unsigned Index = 0;
719 if (!resolveSymbolicName(Name, OutputConstraints, Index))
720 return false;
721
722 // If the constraint is already tied, it must be tied to the
723 // same operand referenced to by the number.
724 if (Info.hasTiedOperand() && Info.getTiedOperand() != Index)
725 return false;
726
727 // A number must refer to an output only operand.
728 if (OutputConstraints[Index].isReadWrite())
729 return false;
730
731 Info.setTiedOperand(Index, OutputConstraints[Index]);
732 break;
733 }
734 case '%': // commutative
735 // FIXME: Fail if % is used with the last operand.
736 break;
737 case 'i': // immediate integer.
738 break;
739 case 'n': // immediate integer with a known value.
740 Info.setRequiresImmediate();
741 break;
742 case 'I': // Various constant constraints with target-specific meanings.
743 case 'J':
744 case 'K':
745 case 'L':
746 case 'M':
747 case 'N':
748 case 'O':
749 case 'P':
750 if (!validateAsmConstraint(Name, Info))
751 return false;
752 break;
753 case 'r': // general register.
754 Info.setAllowsRegister();
755 break;
756 case 'm': // memory operand.
757 case 'o': // offsettable memory operand.
758 case 'V': // non-offsettable memory operand.
759 case '<': // autodecrement memory operand.
760 case '>': // autoincrement memory operand.
761 Info.setAllowsMemory();
762 break;
763 case 'g': // general register, memory operand or immediate integer.
764 case 'X': // any operand.
765 Info.setAllowsRegister();
766 Info.setAllowsMemory();
767 break;
768 case 'E': // immediate floating point.
769 case 'F': // immediate floating point.
770 case 'p': // address operand.
771 break;
772 case ',': // multiple alternative constraint. Ignore comma.
773 break;
774 case '#': // Ignore as constraint.
775 while (Name[1] && Name[1] != ',')
776 Name++;
777 break;
778 case '?': // Disparage slightly code.
779 case '!': // Disparage severely.
780 case '*': // Ignore for choosing register preferences.
781 break; // Pass them.
782 }
783
784 Name++;
785 }
786
787 return true;
788 }
789
CheckFixedPointBits() const790 void TargetInfo::CheckFixedPointBits() const {
791 // Check that the number of fractional and integral bits (and maybe sign) can
792 // fit into the bits given for a fixed point type.
793 assert(ShortAccumScale + getShortAccumIBits() + 1 <= ShortAccumWidth);
794 assert(AccumScale + getAccumIBits() + 1 <= AccumWidth);
795 assert(LongAccumScale + getLongAccumIBits() + 1 <= LongAccumWidth);
796 assert(getUnsignedShortAccumScale() + getUnsignedShortAccumIBits() <=
797 ShortAccumWidth);
798 assert(getUnsignedAccumScale() + getUnsignedAccumIBits() <= AccumWidth);
799 assert(getUnsignedLongAccumScale() + getUnsignedLongAccumIBits() <=
800 LongAccumWidth);
801
802 assert(getShortFractScale() + 1 <= ShortFractWidth);
803 assert(getFractScale() + 1 <= FractWidth);
804 assert(getLongFractScale() + 1 <= LongFractWidth);
805 assert(getUnsignedShortFractScale() <= ShortFractWidth);
806 assert(getUnsignedFractScale() <= FractWidth);
807 assert(getUnsignedLongFractScale() <= LongFractWidth);
808
809 // Each unsigned fract type has either the same number of fractional bits
810 // as, or one more fractional bit than, its corresponding signed fract type.
811 assert(getShortFractScale() == getUnsignedShortFractScale() ||
812 getShortFractScale() == getUnsignedShortFractScale() - 1);
813 assert(getFractScale() == getUnsignedFractScale() ||
814 getFractScale() == getUnsignedFractScale() - 1);
815 assert(getLongFractScale() == getUnsignedLongFractScale() ||
816 getLongFractScale() == getUnsignedLongFractScale() - 1);
817
818 // When arranged in order of increasing rank (see 6.3.1.3a), the number of
819 // fractional bits is nondecreasing for each of the following sets of
820 // fixed-point types:
821 // - signed fract types
822 // - unsigned fract types
823 // - signed accum types
824 // - unsigned accum types.
825 assert(getLongFractScale() >= getFractScale() &&
826 getFractScale() >= getShortFractScale());
827 assert(getUnsignedLongFractScale() >= getUnsignedFractScale() &&
828 getUnsignedFractScale() >= getUnsignedShortFractScale());
829 assert(LongAccumScale >= AccumScale && AccumScale >= ShortAccumScale);
830 assert(getUnsignedLongAccumScale() >= getUnsignedAccumScale() &&
831 getUnsignedAccumScale() >= getUnsignedShortAccumScale());
832
833 // When arranged in order of increasing rank (see 6.3.1.3a), the number of
834 // integral bits is nondecreasing for each of the following sets of
835 // fixed-point types:
836 // - signed accum types
837 // - unsigned accum types
838 assert(getLongAccumIBits() >= getAccumIBits() &&
839 getAccumIBits() >= getShortAccumIBits());
840 assert(getUnsignedLongAccumIBits() >= getUnsignedAccumIBits() &&
841 getUnsignedAccumIBits() >= getUnsignedShortAccumIBits());
842
843 // Each signed accum type has at least as many integral bits as its
844 // corresponding unsigned accum type.
845 assert(getShortAccumIBits() >= getUnsignedShortAccumIBits());
846 assert(getAccumIBits() >= getUnsignedAccumIBits());
847 assert(getLongAccumIBits() >= getUnsignedLongAccumIBits());
848 }
849
copyAuxTarget(const TargetInfo * Aux)850 void TargetInfo::copyAuxTarget(const TargetInfo *Aux) {
851 auto *Target = static_cast<TransferrableTargetInfo*>(this);
852 auto *Src = static_cast<const TransferrableTargetInfo*>(Aux);
853 *Target = *Src;
854 }
855