1 //===--- TargetInfo.cpp - Information about Target machine ----------------===//
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 TargetInfo and TargetInfoImpl interfaces.
11 //
12 //===----------------------------------------------------------------------===//
13
14 #include "clang/Basic/TargetInfo.h"
15 #include "clang/Basic/AddressSpaces.h"
16 #include "clang/Basic/CharInfo.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 <cstdlib>
22 using namespace clang;
23
24 static const LangAS::Map DefaultAddrSpaceMap = { 0 };
25
26 // TargetInfo Constructor.
TargetInfo(const llvm::Triple & T)27 TargetInfo::TargetInfo(const llvm::Triple &T) : TargetOpts(), Triple(T) {
28 // Set defaults. Defaults are set for a 32-bit RISC platform, like PPC or
29 // SPARC. These should be overridden by concrete targets as needed.
30 BigEndian = true;
31 TLSSupported = true;
32 NoAsmVariants = false;
33 HasFloat128 = false;
34 PointerWidth = PointerAlign = 32;
35 BoolWidth = BoolAlign = 8;
36 IntWidth = IntAlign = 32;
37 LongWidth = LongAlign = 32;
38 LongLongWidth = LongLongAlign = 64;
39 SuitableAlign = 64;
40 DefaultAlignForAttributeAligned = 128;
41 MinGlobalAlign = 0;
42 HalfWidth = 16;
43 HalfAlign = 16;
44 FloatWidth = 32;
45 FloatAlign = 32;
46 DoubleWidth = 64;
47 DoubleAlign = 64;
48 LongDoubleWidth = 64;
49 LongDoubleAlign = 64;
50 Float128Align = 128;
51 LargeArrayMinWidth = 0;
52 LargeArrayAlign = 0;
53 MaxAtomicPromoteWidth = MaxAtomicInlineWidth = 0;
54 MaxVectorAlign = 0;
55 MaxTLSAlign = 0;
56 SimdDefaultAlign = 0;
57 SizeType = UnsignedLong;
58 PtrDiffType = SignedLong;
59 IntMaxType = SignedLongLong;
60 IntPtrType = SignedLong;
61 WCharType = SignedInt;
62 WIntType = SignedInt;
63 Char16Type = UnsignedShort;
64 Char32Type = UnsignedInt;
65 Int64Type = SignedLongLong;
66 SigAtomicType = SignedInt;
67 ProcessIDType = SignedInt;
68 UseSignedCharForObjCBool = true;
69 UseBitFieldTypeAlignment = true;
70 UseZeroLengthBitfieldAlignment = false;
71 UseExplicitBitFieldAlignment = true;
72 ZeroLengthBitfieldBoundary = 0;
73 HalfFormat = &llvm::APFloat::IEEEhalf;
74 FloatFormat = &llvm::APFloat::IEEEsingle;
75 DoubleFormat = &llvm::APFloat::IEEEdouble;
76 LongDoubleFormat = &llvm::APFloat::IEEEdouble;
77 Float128Format = &llvm::APFloat::IEEEquad;
78 MCountName = "mcount";
79 RegParmMax = 0;
80 SSERegParmMax = 0;
81 HasAlignMac68kSupport = false;
82 HasBuiltinMSVaList = false;
83 IsRenderScriptTarget = false;
84
85 // Default to no types using fpret.
86 RealTypeUsesObjCFPRet = 0;
87
88 // Default to not using fp2ret for __Complex long double
89 ComplexLongDoubleUsesFP2Ret = false;
90
91 // Set the C++ ABI based on the triple.
92 TheCXXABI.set(Triple.isKnownWindowsMSVCEnvironment()
93 ? TargetCXXABI::Microsoft
94 : TargetCXXABI::GenericItanium);
95
96 // Default to an empty address space map.
97 AddrSpaceMap = &DefaultAddrSpaceMap;
98 UseAddrSpaceMapMangling = false;
99
100 // Default to an unknown platform name.
101 PlatformName = "unknown";
102 PlatformMinVersion = VersionTuple();
103 }
104
105 // Out of line virtual dtor for TargetInfo.
~TargetInfo()106 TargetInfo::~TargetInfo() {}
107
108 /// getTypeName - Return the user string for the specified integer type enum.
109 /// For example, SignedShort -> "short".
getTypeName(IntType T)110 const char *TargetInfo::getTypeName(IntType T) {
111 switch (T) {
112 default: llvm_unreachable("not an integer!");
113 case SignedChar: return "signed char";
114 case UnsignedChar: return "unsigned char";
115 case SignedShort: return "short";
116 case UnsignedShort: return "unsigned short";
117 case SignedInt: return "int";
118 case UnsignedInt: return "unsigned int";
119 case SignedLong: return "long int";
120 case UnsignedLong: return "long unsigned int";
121 case SignedLongLong: return "long long int";
122 case UnsignedLongLong: return "long long unsigned int";
123 }
124 }
125
126 /// getTypeConstantSuffix - Return the constant suffix for the specified
127 /// integer type enum. For example, SignedLong -> "L".
getTypeConstantSuffix(IntType T) const128 const char *TargetInfo::getTypeConstantSuffix(IntType T) const {
129 switch (T) {
130 default: llvm_unreachable("not an integer!");
131 case SignedChar:
132 case SignedShort:
133 case SignedInt: return "";
134 case SignedLong: return "L";
135 case SignedLongLong: return "LL";
136 case UnsignedChar:
137 if (getCharWidth() < getIntWidth())
138 return "";
139 case UnsignedShort:
140 if (getShortWidth() < getIntWidth())
141 return "";
142 case UnsignedInt: return "U";
143 case UnsignedLong: return "UL";
144 case UnsignedLongLong: return "ULL";
145 }
146 }
147
148 /// getTypeFormatModifier - Return the printf format modifier for the
149 /// specified integer type enum. For example, SignedLong -> "l".
150
getTypeFormatModifier(IntType T)151 const char *TargetInfo::getTypeFormatModifier(IntType T) {
152 switch (T) {
153 default: llvm_unreachable("not an integer!");
154 case SignedChar:
155 case UnsignedChar: return "hh";
156 case SignedShort:
157 case UnsignedShort: return "h";
158 case SignedInt:
159 case UnsignedInt: return "";
160 case SignedLong:
161 case UnsignedLong: return "l";
162 case SignedLongLong:
163 case UnsignedLongLong: return "ll";
164 }
165 }
166
167 /// getTypeWidth - Return the width (in bits) of the specified integer type
168 /// enum. For example, SignedInt -> getIntWidth().
getTypeWidth(IntType T) const169 unsigned TargetInfo::getTypeWidth(IntType T) const {
170 switch (T) {
171 default: llvm_unreachable("not an integer!");
172 case SignedChar:
173 case UnsignedChar: return getCharWidth();
174 case SignedShort:
175 case UnsignedShort: return getShortWidth();
176 case SignedInt:
177 case UnsignedInt: return getIntWidth();
178 case SignedLong:
179 case UnsignedLong: return getLongWidth();
180 case SignedLongLong:
181 case UnsignedLongLong: return getLongLongWidth();
182 };
183 }
184
getIntTypeByWidth(unsigned BitWidth,bool IsSigned) const185 TargetInfo::IntType TargetInfo::getIntTypeByWidth(
186 unsigned BitWidth, bool IsSigned) const {
187 if (getCharWidth() == BitWidth)
188 return IsSigned ? SignedChar : UnsignedChar;
189 if (getShortWidth() == BitWidth)
190 return IsSigned ? SignedShort : UnsignedShort;
191 if (getIntWidth() == BitWidth)
192 return IsSigned ? SignedInt : UnsignedInt;
193 if (getLongWidth() == BitWidth)
194 return IsSigned ? SignedLong : UnsignedLong;
195 if (getLongLongWidth() == BitWidth)
196 return IsSigned ? SignedLongLong : UnsignedLongLong;
197 return NoInt;
198 }
199
getLeastIntTypeByWidth(unsigned BitWidth,bool IsSigned) const200 TargetInfo::IntType TargetInfo::getLeastIntTypeByWidth(unsigned BitWidth,
201 bool IsSigned) const {
202 if (getCharWidth() >= BitWidth)
203 return IsSigned ? SignedChar : UnsignedChar;
204 if (getShortWidth() >= BitWidth)
205 return IsSigned ? SignedShort : UnsignedShort;
206 if (getIntWidth() >= BitWidth)
207 return IsSigned ? SignedInt : UnsignedInt;
208 if (getLongWidth() >= BitWidth)
209 return IsSigned ? SignedLong : UnsignedLong;
210 if (getLongLongWidth() >= BitWidth)
211 return IsSigned ? SignedLongLong : UnsignedLongLong;
212 return NoInt;
213 }
214
getRealTypeByWidth(unsigned BitWidth) const215 TargetInfo::RealType TargetInfo::getRealTypeByWidth(unsigned BitWidth) const {
216 if (getFloatWidth() == BitWidth)
217 return Float;
218 if (getDoubleWidth() == BitWidth)
219 return Double;
220
221 switch (BitWidth) {
222 case 96:
223 if (&getLongDoubleFormat() == &llvm::APFloat::x87DoubleExtended)
224 return LongDouble;
225 break;
226 case 128:
227 if (&getLongDoubleFormat() == &llvm::APFloat::PPCDoubleDouble ||
228 &getLongDoubleFormat() == &llvm::APFloat::IEEEquad)
229 return LongDouble;
230 if (hasFloat128Type())
231 return Float128;
232 break;
233 }
234
235 return NoFloat;
236 }
237
238 /// getTypeAlign - Return the alignment (in bits) of the specified integer type
239 /// enum. For example, SignedInt -> getIntAlign().
getTypeAlign(IntType T) const240 unsigned TargetInfo::getTypeAlign(IntType T) const {
241 switch (T) {
242 default: llvm_unreachable("not an integer!");
243 case SignedChar:
244 case UnsignedChar: return getCharAlign();
245 case SignedShort:
246 case UnsignedShort: return getShortAlign();
247 case SignedInt:
248 case UnsignedInt: return getIntAlign();
249 case SignedLong:
250 case UnsignedLong: return getLongAlign();
251 case SignedLongLong:
252 case UnsignedLongLong: return getLongLongAlign();
253 };
254 }
255
256 /// isTypeSigned - Return whether an integer types is signed. Returns true if
257 /// the type is signed; false otherwise.
isTypeSigned(IntType T)258 bool TargetInfo::isTypeSigned(IntType T) {
259 switch (T) {
260 default: llvm_unreachable("not an integer!");
261 case SignedChar:
262 case SignedShort:
263 case SignedInt:
264 case SignedLong:
265 case SignedLongLong:
266 return true;
267 case UnsignedChar:
268 case UnsignedShort:
269 case UnsignedInt:
270 case UnsignedLong:
271 case UnsignedLongLong:
272 return false;
273 };
274 }
275
276 /// adjust - Set forced language options.
277 /// Apply changes to the target information with respect to certain
278 /// language options which change the target configuration.
adjust(const LangOptions & Opts)279 void TargetInfo::adjust(const LangOptions &Opts) {
280 if (Opts.NoBitFieldTypeAlign)
281 UseBitFieldTypeAlignment = false;
282 if (Opts.ShortWChar)
283 WCharType = UnsignedShort;
284 if (Opts.AlignDouble) {
285 DoubleAlign = LongLongAlign = 64;
286 LongDoubleAlign = 64;
287 }
288
289 if (Opts.OpenCL) {
290 // OpenCL C requires specific widths for types, irrespective of
291 // what these normally are for the target.
292 // We also define long long and long double here, although the
293 // OpenCL standard only mentions these as "reserved".
294 IntWidth = IntAlign = 32;
295 LongWidth = LongAlign = 64;
296 LongLongWidth = LongLongAlign = 128;
297 HalfWidth = HalfAlign = 16;
298 FloatWidth = FloatAlign = 32;
299
300 // Embedded 32-bit targets (OpenCL EP) might have double C type
301 // defined as float. Let's not override this as it might lead
302 // to generating illegal code that uses 64bit doubles.
303 if (DoubleWidth != FloatWidth) {
304 DoubleWidth = DoubleAlign = 64;
305 DoubleFormat = &llvm::APFloat::IEEEdouble;
306 }
307 LongDoubleWidth = LongDoubleAlign = 128;
308
309 assert(PointerWidth == 32 || PointerWidth == 64);
310 bool Is32BitArch = PointerWidth == 32;
311 SizeType = Is32BitArch ? UnsignedInt : UnsignedLong;
312 PtrDiffType = Is32BitArch ? SignedInt : SignedLong;
313 IntPtrType = Is32BitArch ? SignedInt : SignedLong;
314
315 IntMaxType = SignedLongLong;
316 Int64Type = SignedLong;
317
318 HalfFormat = &llvm::APFloat::IEEEhalf;
319 FloatFormat = &llvm::APFloat::IEEEsingle;
320 LongDoubleFormat = &llvm::APFloat::IEEEquad;
321 }
322 }
323
initFeatureMap(llvm::StringMap<bool> & Features,DiagnosticsEngine & Diags,StringRef CPU,const std::vector<std::string> & FeatureVec) const324 bool TargetInfo::initFeatureMap(
325 llvm::StringMap<bool> &Features, DiagnosticsEngine &Diags, StringRef CPU,
326 const std::vector<std::string> &FeatureVec) const {
327 for (const auto &F : FeatureVec) {
328 StringRef Name = F;
329 // Apply the feature via the target.
330 bool Enabled = Name[0] == '+';
331 setFeatureEnabled(Features, Name.substr(1), Enabled);
332 }
333 return true;
334 }
335
336 //===----------------------------------------------------------------------===//
337
338
removeGCCRegisterPrefix(StringRef Name)339 static StringRef removeGCCRegisterPrefix(StringRef Name) {
340 if (Name[0] == '%' || Name[0] == '#')
341 Name = Name.substr(1);
342
343 return Name;
344 }
345
346 /// isValidClobber - Returns whether the passed in string is
347 /// a valid clobber in an inline asm statement. This is used by
348 /// Sema.
isValidClobber(StringRef Name) const349 bool TargetInfo::isValidClobber(StringRef Name) const {
350 return (isValidGCCRegisterName(Name) ||
351 Name == "memory" || Name == "cc");
352 }
353
354 /// isValidGCCRegisterName - Returns whether the passed in string
355 /// is a valid register name according to GCC. This is used by Sema for
356 /// inline asm statements.
isValidGCCRegisterName(StringRef Name) const357 bool TargetInfo::isValidGCCRegisterName(StringRef Name) const {
358 if (Name.empty())
359 return false;
360
361 // Get rid of any register prefix.
362 Name = removeGCCRegisterPrefix(Name);
363 if (Name.empty())
364 return false;
365
366 ArrayRef<const char *> Names = getGCCRegNames();
367
368 // If we have a number it maps to an entry in the register name array.
369 if (isDigit(Name[0])) {
370 unsigned n;
371 if (!Name.getAsInteger(0, n))
372 return n < Names.size();
373 }
374
375 // Check register names.
376 if (std::find(Names.begin(), Names.end(), Name) != Names.end())
377 return true;
378
379 // Check any additional names that we have.
380 for (const AddlRegName &ARN : getGCCAddlRegNames())
381 for (const char *AN : ARN.Names) {
382 if (!AN)
383 break;
384 // Make sure the register that the additional name is for is within
385 // the bounds of the register names from above.
386 if (AN == Name && ARN.RegNum < Names.size())
387 return true;
388 }
389
390 // Now check aliases.
391 for (const GCCRegAlias &GRA : getGCCRegAliases())
392 for (const char *A : GRA.Aliases) {
393 if (!A)
394 break;
395 if (A == Name)
396 return true;
397 }
398
399 return false;
400 }
401
402 StringRef
getNormalizedGCCRegisterName(StringRef Name) const403 TargetInfo::getNormalizedGCCRegisterName(StringRef Name) const {
404 assert(isValidGCCRegisterName(Name) && "Invalid register passed in");
405
406 // Get rid of any register prefix.
407 Name = removeGCCRegisterPrefix(Name);
408
409 ArrayRef<const char *> Names = getGCCRegNames();
410
411 // First, check if we have a number.
412 if (isDigit(Name[0])) {
413 unsigned n;
414 if (!Name.getAsInteger(0, n)) {
415 assert(n < Names.size() && "Out of bounds register number!");
416 return Names[n];
417 }
418 }
419
420 // Check any additional names that we have.
421 for (const AddlRegName &ARN : getGCCAddlRegNames())
422 for (const char *AN : ARN.Names) {
423 if (!AN)
424 break;
425 // Make sure the register that the additional name is for is within
426 // the bounds of the register names from above.
427 if (AN == Name && ARN.RegNum < Names.size())
428 return Name;
429 }
430
431 // Now check aliases.
432 for (const GCCRegAlias &RA : getGCCRegAliases())
433 for (const char *A : RA.Aliases) {
434 if (!A)
435 break;
436 if (A == Name)
437 return RA.Register;
438 }
439
440 return Name;
441 }
442
validateOutputConstraint(ConstraintInfo & Info) const443 bool TargetInfo::validateOutputConstraint(ConstraintInfo &Info) const {
444 const char *Name = Info.getConstraintStr().c_str();
445 // An output constraint must start with '=' or '+'
446 if (*Name != '=' && *Name != '+')
447 return false;
448
449 if (*Name == '+')
450 Info.setIsReadWrite();
451
452 Name++;
453 while (*Name) {
454 switch (*Name) {
455 default:
456 if (!validateAsmConstraint(Name, Info)) {
457 // FIXME: We temporarily return false
458 // so we can add more constraints as we hit it.
459 // Eventually, an unknown constraint should just be treated as 'g'.
460 return false;
461 }
462 break;
463 case '&': // early clobber.
464 Info.setEarlyClobber();
465 break;
466 case '%': // commutative.
467 // FIXME: Check that there is a another register after this one.
468 break;
469 case 'r': // general register.
470 Info.setAllowsRegister();
471 break;
472 case 'm': // memory operand.
473 case 'o': // offsetable memory operand.
474 case 'V': // non-offsetable memory operand.
475 case '<': // autodecrement memory operand.
476 case '>': // autoincrement memory operand.
477 Info.setAllowsMemory();
478 break;
479 case 'g': // general register, memory operand or immediate integer.
480 case 'X': // any operand.
481 Info.setAllowsRegister();
482 Info.setAllowsMemory();
483 break;
484 case ',': // multiple alternative constraint. Pass it.
485 // Handle additional optional '=' or '+' modifiers.
486 if (Name[1] == '=' || Name[1] == '+')
487 Name++;
488 break;
489 case '#': // Ignore as constraint.
490 while (Name[1] && Name[1] != ',')
491 Name++;
492 break;
493 case '?': // Disparage slightly code.
494 case '!': // Disparage severely.
495 case '*': // Ignore for choosing register preferences.
496 break; // Pass them.
497 }
498
499 Name++;
500 }
501
502 // Early clobber with a read-write constraint which doesn't permit registers
503 // is invalid.
504 if (Info.earlyClobber() && Info.isReadWrite() && !Info.allowsRegister())
505 return false;
506
507 // If a constraint allows neither memory nor register operands it contains
508 // only modifiers. Reject it.
509 return Info.allowsMemory() || Info.allowsRegister();
510 }
511
resolveSymbolicName(const char * & Name,ArrayRef<ConstraintInfo> OutputConstraints,unsigned & Index) const512 bool TargetInfo::resolveSymbolicName(const char *&Name,
513 ArrayRef<ConstraintInfo> OutputConstraints,
514 unsigned &Index) const {
515 assert(*Name == '[' && "Symbolic name did not start with '['");
516 Name++;
517 const char *Start = Name;
518 while (*Name && *Name != ']')
519 Name++;
520
521 if (!*Name) {
522 // Missing ']'
523 return false;
524 }
525
526 std::string SymbolicName(Start, Name - Start);
527
528 for (Index = 0; Index != OutputConstraints.size(); ++Index)
529 if (SymbolicName == OutputConstraints[Index].getName())
530 return true;
531
532 return false;
533 }
534
validateInputConstraint(MutableArrayRef<ConstraintInfo> OutputConstraints,ConstraintInfo & Info) const535 bool TargetInfo::validateInputConstraint(
536 MutableArrayRef<ConstraintInfo> OutputConstraints,
537 ConstraintInfo &Info) const {
538 const char *Name = Info.ConstraintStr.c_str();
539
540 if (!*Name)
541 return false;
542
543 while (*Name) {
544 switch (*Name) {
545 default:
546 // Check if we have a matching constraint
547 if (*Name >= '0' && *Name <= '9') {
548 const char *DigitStart = Name;
549 while (Name[1] >= '0' && Name[1] <= '9')
550 Name++;
551 const char *DigitEnd = Name;
552 unsigned i;
553 if (StringRef(DigitStart, DigitEnd - DigitStart + 1)
554 .getAsInteger(10, i))
555 return false;
556
557 // Check if matching constraint is out of bounds.
558 if (i >= OutputConstraints.size()) return false;
559
560 // A number must refer to an output only operand.
561 if (OutputConstraints[i].isReadWrite())
562 return false;
563
564 // If the constraint is already tied, it must be tied to the
565 // same operand referenced to by the number.
566 if (Info.hasTiedOperand() && Info.getTiedOperand() != i)
567 return false;
568
569 // The constraint should have the same info as the respective
570 // output constraint.
571 Info.setTiedOperand(i, OutputConstraints[i]);
572 } else if (!validateAsmConstraint(Name, Info)) {
573 // FIXME: This error return is in place temporarily so we can
574 // add more constraints as we hit it. Eventually, an unknown
575 // constraint should just be treated as 'g'.
576 return false;
577 }
578 break;
579 case '[': {
580 unsigned Index = 0;
581 if (!resolveSymbolicName(Name, OutputConstraints, Index))
582 return false;
583
584 // If the constraint is already tied, it must be tied to the
585 // same operand referenced to by the number.
586 if (Info.hasTiedOperand() && Info.getTiedOperand() != Index)
587 return false;
588
589 // A number must refer to an output only operand.
590 if (OutputConstraints[Index].isReadWrite())
591 return false;
592
593 Info.setTiedOperand(Index, OutputConstraints[Index]);
594 break;
595 }
596 case '%': // commutative
597 // FIXME: Fail if % is used with the last operand.
598 break;
599 case 'i': // immediate integer.
600 case 'n': // immediate integer with a known value.
601 break;
602 case 'I': // Various constant constraints with target-specific meanings.
603 case 'J':
604 case 'K':
605 case 'L':
606 case 'M':
607 case 'N':
608 case 'O':
609 case 'P':
610 if (!validateAsmConstraint(Name, Info))
611 return false;
612 break;
613 case 'r': // general register.
614 Info.setAllowsRegister();
615 break;
616 case 'm': // memory operand.
617 case 'o': // offsettable memory operand.
618 case 'V': // non-offsettable memory operand.
619 case '<': // autodecrement memory operand.
620 case '>': // autoincrement memory operand.
621 Info.setAllowsMemory();
622 break;
623 case 'g': // general register, memory operand or immediate integer.
624 case 'X': // any operand.
625 Info.setAllowsRegister();
626 Info.setAllowsMemory();
627 break;
628 case 'E': // immediate floating point.
629 case 'F': // immediate floating point.
630 case 'p': // address operand.
631 break;
632 case ',': // multiple alternative constraint. Ignore comma.
633 break;
634 case '#': // Ignore as constraint.
635 while (Name[1] && Name[1] != ',')
636 Name++;
637 break;
638 case '?': // Disparage slightly code.
639 case '!': // Disparage severely.
640 case '*': // Ignore for choosing register preferences.
641 break; // Pass them.
642 }
643
644 Name++;
645 }
646
647 return true;
648 }
649