1//===--- Mips.h - Declare Mips target feature support -----------*- C++ -*-===//
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 declares Mips TargetInfo objects.
10//
11//===----------------------------------------------------------------------===//
12
13#ifndef LLVM_CLANG_LIB_BASIC_TARGETS_MIPS_H
14#define LLVM_CLANG_LIB_BASIC_TARGETS_MIPS_H
15
16#include "OSTargets.h"
17#include "clang/Basic/TargetInfo.h"
18#include "clang/Basic/TargetOptions.h"
19#include "llvm/Support/Compiler.h"
20#include "llvm/TargetParser/Triple.h"
21
22namespace clang {
23namespace targets {
24
25class LLVM_LIBRARY_VISIBILITY MipsTargetInfo : public TargetInfo {
26 void setDataLayout() {
27 StringRef Layout;
28
29 if (ABI == "o32")
30 Layout = "m:m-p:32:32-i8:8:32-i16:16:32-i64:64-n32-S64";
31 else if (ABI == "n32")
32 Layout = "m:e-p:32:32-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128";
33 else if (ABI == "n64")
34 Layout = "m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128";
35 else
36 llvm_unreachable("Invalid ABI");
37
38 if (BigEndian)
39 resetDataLayout(DL: ("E-" + Layout).str());
40 else
41 resetDataLayout(DL: ("e-" + Layout).str());
42 }
43
44 std::string CPU;
45 bool IsMips16;
46 bool IsMicromips;
47 bool IsNan2008;
48 bool IsAbs2008;
49 bool IsSingleFloat;
50 bool IsNoABICalls;
51 bool CanUseBSDABICalls;
52 enum MipsFloatABI { HardFloat, SoftFloat } FloatABI;
53 enum DspRevEnum { NoDSP, DSP1, DSP2 } DspRev;
54 bool HasMSA;
55 bool DisableMadd4;
56 bool UseIndirectJumpHazard;
57 bool NoOddSpreg;
58
59protected:
60 enum FPModeEnum { FPXX, FP32, FP64 } FPMode;
61 std::string ABI;
62
63public:
64 MipsTargetInfo(const llvm::Triple &Triple, const TargetOptions &)
65 : TargetInfo(Triple), IsMips16(false), IsMicromips(false),
66 IsNan2008(false), IsAbs2008(false), IsSingleFloat(false),
67 IsNoABICalls(false), CanUseBSDABICalls(false), FloatABI(HardFloat),
68 DspRev(NoDSP), HasMSA(false), DisableMadd4(false),
69 UseIndirectJumpHazard(false), FPMode(FPXX) {
70 TheCXXABI.set(TargetCXXABI::GenericMIPS);
71
72 if (Triple.isMIPS32())
73 setABI("o32");
74 else if (Triple.isABIN32())
75 setABI("n32");
76 else
77 setABI("n64");
78
79 CPU = ABI == "o32" ? "mips32r2" : "mips64r2";
80
81 CanUseBSDABICalls = Triple.isOSFreeBSD() ||
82 Triple.isOSOpenBSD();
83 }
84
85 bool isIEEE754_2008Default() const {
86 return CPU == "mips32r6" || CPU == "mips64r6";
87 }
88
89 enum FPModeEnum getDefaultFPMode() const {
90 if (CPU == "mips32r6" || ABI == "n32" || ABI == "n64" || ABI == "64")
91 return FP64;
92 else if (CPU == "mips1")
93 return FP32;
94 else
95 return FPXX;
96 }
97
98 bool isNan2008() const override { return IsNan2008; }
99
100 bool processorSupportsGPR64() const;
101
102 StringRef getABI() const override { return ABI; }
103
104 bool setABI(const std::string &Name) override {
105 if (Name == "o32") {
106 setO32ABITypes();
107 ABI = Name;
108 return true;
109 }
110
111 if (Name == "n32") {
112 setN32ABITypes();
113 ABI = Name;
114 return true;
115 }
116 if (Name == "n64") {
117 setN64ABITypes();
118 ABI = Name;
119 return true;
120 }
121 return false;
122 }
123
124 void setO32ABITypes() {
125 Int64Type = SignedLongLong;
126 IntMaxType = Int64Type;
127 LongDoubleFormat = &llvm::APFloat::IEEEdouble();
128 LongDoubleWidth = LongDoubleAlign = 64;
129 LongWidth = LongAlign = 32;
130 MaxAtomicPromoteWidth = MaxAtomicInlineWidth = 32;
131 PointerWidth = PointerAlign = 32;
132 PtrDiffType = SignedInt;
133 SizeType = UnsignedInt;
134 SuitableAlign = 64;
135 }
136
137 void setN32N64ABITypes() {
138 LongDoubleWidth = LongDoubleAlign = 128;
139 LongDoubleFormat = &llvm::APFloat::IEEEquad();
140 if (getTriple().isOSFreeBSD()) {
141 LongDoubleWidth = LongDoubleAlign = 64;
142 LongDoubleFormat = &llvm::APFloat::IEEEdouble();
143 }
144 MaxAtomicPromoteWidth = MaxAtomicInlineWidth = 64;
145 SuitableAlign = 128;
146 }
147
148 void setN64ABITypes() {
149 setN32N64ABITypes();
150 if (getTriple().isOSOpenBSD()) {
151 Int64Type = SignedLongLong;
152 } else {
153 Int64Type = SignedLong;
154 }
155 IntMaxType = Int64Type;
156 LongWidth = LongAlign = 64;
157 PointerWidth = PointerAlign = 64;
158 PtrDiffType = SignedLong;
159 SizeType = UnsignedLong;
160 }
161
162 void setN32ABITypes() {
163 setN32N64ABITypes();
164 Int64Type = SignedLongLong;
165 IntMaxType = Int64Type;
166 LongWidth = LongAlign = 32;
167 PointerWidth = PointerAlign = 32;
168 PtrDiffType = SignedInt;
169 SizeType = UnsignedInt;
170 }
171
172 bool isValidCPUName(StringRef Name) const override;
173 void fillValidCPUList(SmallVectorImpl<StringRef> &Values) const override;
174
175 bool setCPU(const std::string &Name) override {
176 CPU = Name;
177 return isValidCPUName(Name);
178 }
179
180 const std::string &getCPU() const { return CPU; }
181 bool
182 initFeatureMap(llvm::StringMap<bool> &Features, DiagnosticsEngine &Diags,
183 StringRef CPU,
184 const std::vector<std::string> &FeaturesVec) const override {
185 if (CPU.empty())
186 CPU = getCPU();
187 if (CPU == "octeon")
188 Features["mips64r2"] = Features["cnmips"] = true;
189 else if (CPU == "octeon+")
190 Features["mips64r2"] = Features["cnmips"] = Features["cnmipsp"] = true;
191 else
192 Features[CPU] = true;
193 return TargetInfo::initFeatureMap(Features, Diags, CPU, FeatureVec: FeaturesVec);
194 }
195
196 unsigned getISARev() const;
197
198 void getTargetDefines(const LangOptions &Opts,
199 MacroBuilder &Builder) const override;
200
201 llvm::SmallVector<Builtin::InfosShard> getTargetBuiltins() const override;
202
203 bool hasFeature(StringRef Feature) const override;
204
205 BuiltinVaListKind getBuiltinVaListKind() const override {
206 return TargetInfo::VoidPtrBuiltinVaList;
207 }
208
209 ArrayRef<const char *> getGCCRegNames() const override {
210 static const char *const GCCRegNames[] = {
211 // CPU register names
212 // Must match second column of GCCRegAliases
213 "$0", "$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8", "$9", "$10",
214 "$11", "$12", "$13", "$14", "$15", "$16", "$17", "$18", "$19", "$20",
215 "$21", "$22", "$23", "$24", "$25", "$26", "$27", "$28", "$29", "$30",
216 "$31",
217 // Floating point register names
218 "$f0", "$f1", "$f2", "$f3", "$f4", "$f5", "$f6", "$f7", "$f8", "$f9",
219 "$f10", "$f11", "$f12", "$f13", "$f14", "$f15", "$f16", "$f17", "$f18",
220 "$f19", "$f20", "$f21", "$f22", "$f23", "$f24", "$f25", "$f26", "$f27",
221 "$f28", "$f29", "$f30", "$f31",
222 // Hi/lo and condition register names
223 "hi", "lo", "", "$fcc0", "$fcc1", "$fcc2", "$fcc3", "$fcc4", "$fcc5",
224 "$fcc6", "$fcc7", "$ac1hi", "$ac1lo", "$ac2hi", "$ac2lo", "$ac3hi",
225 "$ac3lo",
226 // MSA register names
227 "$w0", "$w1", "$w2", "$w3", "$w4", "$w5", "$w6", "$w7", "$w8", "$w9",
228 "$w10", "$w11", "$w12", "$w13", "$w14", "$w15", "$w16", "$w17", "$w18",
229 "$w19", "$w20", "$w21", "$w22", "$w23", "$w24", "$w25", "$w26", "$w27",
230 "$w28", "$w29", "$w30", "$w31",
231 // MSA control register names
232 "$msair", "$msacsr", "$msaaccess", "$msasave", "$msamodify",
233 "$msarequest", "$msamap", "$msaunmap"
234 };
235 return llvm::ArrayRef(GCCRegNames);
236 }
237
238 bool validateAsmConstraint(const char *&Name,
239 TargetInfo::ConstraintInfo &Info) const override {
240 switch (*Name) {
241 default:
242 return false;
243 case 'r': // CPU registers.
244 case 'd': // Equivalent to "r" unless generating MIPS16 code.
245 case 'y': // Equivalent to "r", backward compatibility only.
246 case 'c': // $25 for indirect jumps
247 case 'l': // lo register
248 case 'x': // hilo register pair
249 Info.setAllowsRegister();
250 return true;
251 case 'f': // floating-point registers.
252 Info.setAllowsRegister();
253 return FloatABI != SoftFloat;
254 case 'I': // Signed 16-bit constant
255 case 'J': // Integer 0
256 case 'K': // Unsigned 16-bit constant
257 case 'L': // Signed 32-bit constant, lower 16-bit zeros (for lui)
258 case 'M': // Constants not loadable via lui, addiu, or ori
259 case 'N': // Constant -1 to -65535
260 case 'O': // A signed 15-bit constant
261 case 'P': // A constant between 1 go 65535
262 return true;
263 case 'R': // An address that can be used in a non-macro load or store
264 Info.setAllowsMemory();
265 return true;
266 case 'Z':
267 if (Name[1] == 'C') { // An address usable by ll, and sc.
268 Info.setAllowsMemory();
269 Name++; // Skip over 'Z'.
270 return true;
271 }
272 return false;
273 }
274 }
275
276 std::string convertConstraint(const char *&Constraint) const override {
277 std::string R;
278 switch (*Constraint) {
279 case 'Z': // Two-character constraint; add "^" hint for later parsing.
280 if (Constraint[1] == 'C') {
281 R = std::string("^") + std::string(Constraint, 2);
282 Constraint++;
283 return R;
284 }
285 break;
286 }
287 return TargetInfo::convertConstraint(Constraint);
288 }
289
290 std::string_view getClobbers() const override {
291 // In GCC, $1 is not widely used in generated code (it's used only in a few
292 // specific situations), so there is no real need for users to add it to
293 // the clobbers list if they want to use it in their inline assembly code.
294 //
295 // In LLVM, $1 is treated as a normal GPR and is always allocatable during
296 // code generation, so using it in inline assembly without adding it to the
297 // clobbers list can cause conflicts between the inline assembly code and
298 // the surrounding generated code.
299 //
300 // Another problem is that LLVM is allowed to choose $1 for inline assembly
301 // operands, which will conflict with the ".set at" assembler option (which
302 // we use only for inline assembly, in order to maintain compatibility with
303 // GCC) and will also conflict with the user's usage of $1.
304 //
305 // The easiest way to avoid these conflicts and keep $1 as an allocatable
306 // register for generated code is to automatically clobber $1 for all inline
307 // assembly code.
308 //
309 // FIXME: We should automatically clobber $1 only for inline assembly code
310 // which actually uses it. This would allow LLVM to use $1 for inline
311 // assembly operands if the user's assembly code doesn't use it.
312 return "~{$1}";
313 }
314
315 bool handleTargetFeatures(std::vector<std::string> &Features,
316 DiagnosticsEngine &Diags) override {
317 IsMips16 = false;
318 IsMicromips = false;
319 IsNan2008 = isIEEE754_2008Default();
320 IsAbs2008 = isIEEE754_2008Default();
321 IsSingleFloat = false;
322 FloatABI = HardFloat;
323 DspRev = NoDSP;
324 NoOddSpreg = false;
325 FPMode = getDefaultFPMode();
326 bool OddSpregGiven = false;
327 bool StrictAlign = false;
328 bool FpGiven = false;
329
330 for (const auto &Feature : Features) {
331 if (Feature == "+single-float")
332 IsSingleFloat = true;
333 else if (Feature == "+soft-float")
334 FloatABI = SoftFloat;
335 else if (Feature == "+mips16")
336 IsMips16 = true;
337 else if (Feature == "+micromips")
338 IsMicromips = true;
339 else if (Feature == "+mips32r6" || Feature == "+mips64r6")
340 HasUnalignedAccess = true;
341 // We cannot be sure that the order of strict-align vs mips32r6.
342 // Thus we need an extra variable here.
343 else if (Feature == "+strict-align")
344 StrictAlign = true;
345 else if (Feature == "+dsp")
346 DspRev = std::max(a: DspRev, b: DSP1);
347 else if (Feature == "+dspr2")
348 DspRev = std::max(a: DspRev, b: DSP2);
349 else if (Feature == "+msa")
350 HasMSA = true;
351 else if (Feature == "+nomadd4")
352 DisableMadd4 = true;
353 else if (Feature == "+fp64") {
354 FPMode = FP64;
355 FpGiven = true;
356 } else if (Feature == "-fp64") {
357 FPMode = FP32;
358 FpGiven = true;
359 } else if (Feature == "+fpxx") {
360 FPMode = FPXX;
361 FpGiven = true;
362 } else if (Feature == "+nan2008")
363 IsNan2008 = true;
364 else if (Feature == "-nan2008")
365 IsNan2008 = false;
366 else if (Feature == "+abs2008")
367 IsAbs2008 = true;
368 else if (Feature == "-abs2008")
369 IsAbs2008 = false;
370 else if (Feature == "+noabicalls")
371 IsNoABICalls = true;
372 else if (Feature == "+use-indirect-jump-hazard")
373 UseIndirectJumpHazard = true;
374 else if (Feature == "+nooddspreg") {
375 NoOddSpreg = true;
376 OddSpregGiven = false;
377 } else if (Feature == "-nooddspreg") {
378 NoOddSpreg = false;
379 OddSpregGiven = true;
380 }
381 }
382
383 if (FPMode == FPXX && !OddSpregGiven)
384 NoOddSpreg = true;
385
386 if (StrictAlign)
387 HasUnalignedAccess = false;
388
389 if (HasMSA && !FpGiven) {
390 FPMode = FP64;
391 Features.push_back(x: "+fp64");
392 }
393
394 setDataLayout();
395
396 return true;
397 }
398
399 int getEHDataRegisterNumber(unsigned RegNo) const override {
400 if (RegNo == 0)
401 return 4;
402 if (RegNo == 1)
403 return 5;
404 return -1;
405 }
406
407 bool isCLZForZeroUndef() const override { return false; }
408
409 ArrayRef<TargetInfo::GCCRegAlias> getGCCRegAliases() const override {
410 static const TargetInfo::GCCRegAlias O32RegAliases[] = {
411 {.Aliases: {"at"}, .Register: "$1"}, {.Aliases: {"v0"}, .Register: "$2"}, {.Aliases: {"v1"}, .Register: "$3"},
412 {.Aliases: {"a0"}, .Register: "$4"}, {.Aliases: {"a1"}, .Register: "$5"}, {.Aliases: {"a2"}, .Register: "$6"},
413 {.Aliases: {"a3"}, .Register: "$7"}, {.Aliases: {"t0"}, .Register: "$8"}, {.Aliases: {"t1"}, .Register: "$9"},
414 {.Aliases: {"t2"}, .Register: "$10"}, {.Aliases: {"t3"}, .Register: "$11"}, {.Aliases: {"t4"}, .Register: "$12"},
415 {.Aliases: {"t5"}, .Register: "$13"}, {.Aliases: {"t6"}, .Register: "$14"}, {.Aliases: {"t7"}, .Register: "$15"},
416 {.Aliases: {"s0"}, .Register: "$16"}, {.Aliases: {"s1"}, .Register: "$17"}, {.Aliases: {"s2"}, .Register: "$18"},
417 {.Aliases: {"s3"}, .Register: "$19"}, {.Aliases: {"s4"}, .Register: "$20"}, {.Aliases: {"s5"}, .Register: "$21"},
418 {.Aliases: {"s6"}, .Register: "$22"}, {.Aliases: {"s7"}, .Register: "$23"}, {.Aliases: {"t8"}, .Register: "$24"},
419 {.Aliases: {"t9"}, .Register: "$25"}, {.Aliases: {"k0"}, .Register: "$26"}, {.Aliases: {"k1"}, .Register: "$27"},
420 {.Aliases: {"gp"}, .Register: "$28"}, {.Aliases: {"sp", "$sp"}, .Register: "$29"}, {.Aliases: {"fp", "$fp"}, .Register: "$30"},
421 {.Aliases: {"ra"}, .Register: "$31"}
422 };
423 static const TargetInfo::GCCRegAlias NewABIRegAliases[] = {
424 {.Aliases: {"at"}, .Register: "$1"}, {.Aliases: {"v0"}, .Register: "$2"}, {.Aliases: {"v1"}, .Register: "$3"},
425 {.Aliases: {"a0"}, .Register: "$4"}, {.Aliases: {"a1"}, .Register: "$5"}, {.Aliases: {"a2"}, .Register: "$6"},
426 {.Aliases: {"a3"}, .Register: "$7"}, {.Aliases: {"a4"}, .Register: "$8"}, {.Aliases: {"a5"}, .Register: "$9"},
427 {.Aliases: {"a6"}, .Register: "$10"}, {.Aliases: {"a7"}, .Register: "$11"}, {.Aliases: {"t0"}, .Register: "$12"},
428 {.Aliases: {"t1"}, .Register: "$13"}, {.Aliases: {"t2"}, .Register: "$14"}, {.Aliases: {"t3"}, .Register: "$15"},
429 {.Aliases: {"s0"}, .Register: "$16"}, {.Aliases: {"s1"}, .Register: "$17"}, {.Aliases: {"s2"}, .Register: "$18"},
430 {.Aliases: {"s3"}, .Register: "$19"}, {.Aliases: {"s4"}, .Register: "$20"}, {.Aliases: {"s5"}, .Register: "$21"},
431 {.Aliases: {"s6"}, .Register: "$22"}, {.Aliases: {"s7"}, .Register: "$23"}, {.Aliases: {"t8"}, .Register: "$24"},
432 {.Aliases: {"t9"}, .Register: "$25"}, {.Aliases: {"k0"}, .Register: "$26"}, {.Aliases: {"k1"}, .Register: "$27"},
433 {.Aliases: {"gp"}, .Register: "$28"}, {.Aliases: {"sp", "$sp"}, .Register: "$29"}, {.Aliases: {"fp", "$fp"}, .Register: "$30"},
434 {.Aliases: {"ra"}, .Register: "$31"}
435 };
436 if (ABI == "o32")
437 return llvm::ArrayRef(O32RegAliases);
438 return llvm::ArrayRef(NewABIRegAliases);
439 }
440
441 bool hasInt128Type() const override {
442 return (ABI == "n32" || ABI == "n64") || getTargetOpts().ForceEnableInt128;
443 }
444
445 unsigned getUnwindWordWidth() const override;
446
447 bool validateTarget(DiagnosticsEngine &Diags) const override;
448 bool hasBitIntType() const override { return true; }
449
450 std::pair<unsigned, unsigned> hardwareInterferenceSizes() const override {
451 return std::make_pair(x: 32, y: 32);
452 }
453};
454
455class LLVM_LIBRARY_VISIBILITY WindowsMipsTargetInfo
456 : public WindowsTargetInfo<MipsTargetInfo> {
457 const llvm::Triple Triple;
458
459public:
460 WindowsMipsTargetInfo(const llvm::Triple &Triple, const TargetOptions &Opts);
461
462 void getVisualStudioDefines(const LangOptions &Opts,
463 MacroBuilder &Builder) const;
464
465 BuiltinVaListKind getBuiltinVaListKind() const override;
466
467 CallingConvCheckResult checkCallingConvention(CallingConv CC) const override;
468};
469
470// Windows MIPS, MS (C++) ABI
471class LLVM_LIBRARY_VISIBILITY MicrosoftMipsTargetInfo
472 : public WindowsMipsTargetInfo {
473public:
474 MicrosoftMipsTargetInfo(const llvm::Triple &Triple,
475 const TargetOptions &Opts);
476
477 void getTargetDefines(const LangOptions &Opts,
478 MacroBuilder &Builder) const override;
479};
480
481// MIPS MinGW target
482class LLVM_LIBRARY_VISIBILITY MinGWMipsTargetInfo
483 : public WindowsMipsTargetInfo {
484public:
485 MinGWMipsTargetInfo(const llvm::Triple &Triple, const TargetOptions &Opts);
486
487 void getTargetDefines(const LangOptions &Opts,
488 MacroBuilder &Builder) const override;
489};
490} // namespace targets
491} // namespace clang
492
493#endif // LLVM_CLANG_LIB_BASIC_TARGETS_MIPS_H
494

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source code of clang/lib/Basic/Targets/Mips.h