1 //===-- CommandFlags.cpp - Command Line Flags Interface ---------*- 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 contains codegen-specific flags that are shared between different
10 // command line tools. The tools "llc" and "opt" both use this file to prevent
11 // flag duplication.
12 //
13 //===----------------------------------------------------------------------===//
14
15 #include "llvm/CodeGen/CommandFlags.h"
16 #include "llvm/IR/Module.h"
17 #include "llvm/MC/SubtargetFeature.h"
18 #include "llvm/Support/CommandLine.h"
19 #include "llvm/Support/Host.h"
20
21 using namespace llvm;
22
23 #define CGOPT(TY, NAME) \
24 static cl::opt<TY> *NAME##View; \
25 TY codegen::get##NAME() { \
26 assert(NAME##View && "RegisterCodeGenFlags not created."); \
27 return *NAME##View; \
28 }
29
30 #define CGLIST(TY, NAME) \
31 static cl::list<TY> *NAME##View; \
32 std::vector<TY> codegen::get##NAME() { \
33 assert(NAME##View && "RegisterCodeGenFlags not created."); \
34 return *NAME##View; \
35 }
36
37 #define CGOPT_EXP(TY, NAME) \
38 CGOPT(TY, NAME) \
39 Optional<TY> codegen::getExplicit##NAME() { \
40 if (NAME##View->getNumOccurrences()) { \
41 TY res = *NAME##View; \
42 return res; \
43 } \
44 return None; \
45 }
46
CGOPT(std::string,MArch)47 CGOPT(std::string, MArch)
48 CGOPT(std::string, MCPU)
49 CGLIST(std::string, MAttrs)
50 CGOPT_EXP(Reloc::Model, RelocModel)
51 CGOPT(ThreadModel::Model, ThreadModel)
52 CGOPT_EXP(CodeModel::Model, CodeModel)
53 CGOPT(ExceptionHandling, ExceptionModel)
54 CGOPT_EXP(CodeGenFileType, FileType)
55 CGOPT(FramePointer::FP, FramePointerUsage)
56 CGOPT(bool, EnableUnsafeFPMath)
57 CGOPT(bool, EnableNoInfsFPMath)
58 CGOPT(bool, EnableNoNaNsFPMath)
59 CGOPT(bool, EnableNoSignedZerosFPMath)
60 CGOPT(bool, EnableNoTrappingFPMath)
61 CGOPT(bool, EnableAIXExtendedAltivecABI)
62 CGOPT(DenormalMode::DenormalModeKind, DenormalFPMath)
63 CGOPT(DenormalMode::DenormalModeKind, DenormalFP32Math)
64 CGOPT(bool, EnableHonorSignDependentRoundingFPMath)
65 CGOPT(FloatABI::ABIType, FloatABIForCalls)
66 CGOPT(FPOpFusion::FPOpFusionMode, FuseFPOps)
67 CGOPT(bool, DontPlaceZerosInBSS)
68 CGOPT(bool, EnableGuaranteedTailCallOpt)
69 CGOPT(bool, DisableTailCalls)
70 CGOPT(bool, StackSymbolOrdering)
71 CGOPT(unsigned, OverrideStackAlignment)
72 CGOPT(bool, StackRealign)
73 CGOPT(std::string, TrapFuncName)
74 CGOPT(bool, UseCtors)
75 CGOPT(bool, RelaxELFRelocations)
76 CGOPT_EXP(bool, DataSections)
77 CGOPT_EXP(bool, FunctionSections)
78 CGOPT(bool, IgnoreXCOFFVisibility)
79 CGOPT(std::string, BBSections)
80 CGOPT(std::string, StackProtectorGuard)
81 CGOPT(unsigned, StackProtectorGuardOffset)
82 CGOPT(std::string, StackProtectorGuardReg)
83 CGOPT(unsigned, TLSSize)
84 CGOPT(bool, EmulatedTLS)
85 CGOPT(bool, UniqueSectionNames)
86 CGOPT(bool, UniqueBasicBlockSectionNames)
87 CGOPT(EABI, EABIVersion)
88 CGOPT(DebuggerKind, DebuggerTuningOpt)
89 CGOPT(bool, EnableStackSizeSection)
90 CGOPT(bool, EnableAddrsig)
91 CGOPT(bool, EmitCallSiteInfo)
92 CGOPT(bool, EnableMachineFunctionSplitter)
93 CGOPT(bool, EnableDebugEntryValues)
94 CGOPT(bool, PseudoProbeForProfiling)
95 CGOPT(bool, ValueTrackingVariableLocations)
96 CGOPT(bool, ForceDwarfFrameSection)
97 CGOPT(bool, XRayOmitFunctionIndex)
98
99 codegen::RegisterCodeGenFlags::RegisterCodeGenFlags() {
100 #define CGBINDOPT(NAME) \
101 do { \
102 NAME##View = std::addressof(NAME); \
103 } while (0)
104
105 static cl::opt<std::string> MArch(
106 "march", cl::desc("Architecture to generate code for (see --version)"));
107 CGBINDOPT(MArch);
108
109 static cl::opt<std::string> MCPU(
110 "mcpu", cl::desc("Target a specific cpu type (-mcpu=help for details)"),
111 cl::value_desc("cpu-name"), cl::init(""));
112 CGBINDOPT(MCPU);
113
114 static cl::list<std::string> MAttrs(
115 "mattr", cl::CommaSeparated,
116 cl::desc("Target specific attributes (-mattr=help for details)"),
117 cl::value_desc("a1,+a2,-a3,..."));
118 CGBINDOPT(MAttrs);
119
120 static cl::opt<Reloc::Model> RelocModel(
121 "relocation-model", cl::desc("Choose relocation model"),
122 cl::values(
123 clEnumValN(Reloc::Static, "static", "Non-relocatable code"),
124 clEnumValN(Reloc::PIC_, "pic",
125 "Fully relocatable, position independent code"),
126 clEnumValN(Reloc::DynamicNoPIC, "dynamic-no-pic",
127 "Relocatable external references, non-relocatable code"),
128 clEnumValN(
129 Reloc::ROPI, "ropi",
130 "Code and read-only data relocatable, accessed PC-relative"),
131 clEnumValN(
132 Reloc::RWPI, "rwpi",
133 "Read-write data relocatable, accessed relative to static base"),
134 clEnumValN(Reloc::ROPI_RWPI, "ropi-rwpi",
135 "Combination of ropi and rwpi")));
136 CGBINDOPT(RelocModel);
137
138 static cl::opt<ThreadModel::Model> ThreadModel(
139 "thread-model", cl::desc("Choose threading model"),
140 cl::init(ThreadModel::POSIX),
141 cl::values(
142 clEnumValN(ThreadModel::POSIX, "posix", "POSIX thread model"),
143 clEnumValN(ThreadModel::Single, "single", "Single thread model")));
144 CGBINDOPT(ThreadModel);
145
146 static cl::opt<CodeModel::Model> CodeModel(
147 "code-model", cl::desc("Choose code model"),
148 cl::values(clEnumValN(CodeModel::Tiny, "tiny", "Tiny code model"),
149 clEnumValN(CodeModel::Small, "small", "Small code model"),
150 clEnumValN(CodeModel::Kernel, "kernel", "Kernel code model"),
151 clEnumValN(CodeModel::Medium, "medium", "Medium code model"),
152 clEnumValN(CodeModel::Large, "large", "Large code model")));
153 CGBINDOPT(CodeModel);
154
155 static cl::opt<ExceptionHandling> ExceptionModel(
156 "exception-model", cl::desc("exception model"),
157 cl::init(ExceptionHandling::None),
158 cl::values(
159 clEnumValN(ExceptionHandling::None, "default",
160 "default exception handling model"),
161 clEnumValN(ExceptionHandling::DwarfCFI, "dwarf",
162 "DWARF-like CFI based exception handling"),
163 clEnumValN(ExceptionHandling::SjLj, "sjlj",
164 "SjLj exception handling"),
165 clEnumValN(ExceptionHandling::ARM, "arm", "ARM EHABI exceptions"),
166 clEnumValN(ExceptionHandling::WinEH, "wineh",
167 "Windows exception model"),
168 clEnumValN(ExceptionHandling::Wasm, "wasm",
169 "WebAssembly exception handling")));
170 CGBINDOPT(ExceptionModel);
171
172 static cl::opt<CodeGenFileType> FileType(
173 "filetype", cl::init(CGFT_AssemblyFile),
174 cl::desc(
175 "Choose a file type (not all types are supported by all targets):"),
176 cl::values(
177 clEnumValN(CGFT_AssemblyFile, "asm", "Emit an assembly ('.s') file"),
178 clEnumValN(CGFT_ObjectFile, "obj",
179 "Emit a native object ('.o') file"),
180 clEnumValN(CGFT_Null, "null",
181 "Emit nothing, for performance testing")));
182 CGBINDOPT(FileType);
183
184 static cl::opt<FramePointer::FP> FramePointerUsage(
185 "frame-pointer",
186 cl::desc("Specify frame pointer elimination optimization"),
187 cl::init(FramePointer::None),
188 cl::values(
189 clEnumValN(FramePointer::All, "all",
190 "Disable frame pointer elimination"),
191 clEnumValN(FramePointer::NonLeaf, "non-leaf",
192 "Disable frame pointer elimination for non-leaf frame"),
193 clEnumValN(FramePointer::None, "none",
194 "Enable frame pointer elimination")));
195 CGBINDOPT(FramePointerUsage);
196
197 static cl::opt<bool> EnableUnsafeFPMath(
198 "enable-unsafe-fp-math",
199 cl::desc("Enable optimizations that may decrease FP precision"),
200 cl::init(false));
201 CGBINDOPT(EnableUnsafeFPMath);
202
203 static cl::opt<bool> EnableNoInfsFPMath(
204 "enable-no-infs-fp-math",
205 cl::desc("Enable FP math optimizations that assume no +-Infs"),
206 cl::init(false));
207 CGBINDOPT(EnableNoInfsFPMath);
208
209 static cl::opt<bool> EnableNoNaNsFPMath(
210 "enable-no-nans-fp-math",
211 cl::desc("Enable FP math optimizations that assume no NaNs"),
212 cl::init(false));
213 CGBINDOPT(EnableNoNaNsFPMath);
214
215 static cl::opt<bool> EnableNoSignedZerosFPMath(
216 "enable-no-signed-zeros-fp-math",
217 cl::desc("Enable FP math optimizations that assume "
218 "the sign of 0 is insignificant"),
219 cl::init(false));
220 CGBINDOPT(EnableNoSignedZerosFPMath);
221
222 static cl::opt<bool> EnableNoTrappingFPMath(
223 "enable-no-trapping-fp-math",
224 cl::desc("Enable setting the FP exceptions build "
225 "attribute not to use exceptions"),
226 cl::init(false));
227 CGBINDOPT(EnableNoTrappingFPMath);
228
229 static const auto DenormFlagEnumOptions =
230 cl::values(clEnumValN(DenormalMode::IEEE, "ieee",
231 "IEEE 754 denormal numbers"),
232 clEnumValN(DenormalMode::PreserveSign, "preserve-sign",
233 "the sign of a flushed-to-zero number is preserved "
234 "in the sign of 0"),
235 clEnumValN(DenormalMode::PositiveZero, "positive-zero",
236 "denormals are flushed to positive zero"));
237
238 // FIXME: Doesn't have way to specify separate input and output modes.
239 static cl::opt<DenormalMode::DenormalModeKind> DenormalFPMath(
240 "denormal-fp-math",
241 cl::desc("Select which denormal numbers the code is permitted to require"),
242 cl::init(DenormalMode::IEEE),
243 DenormFlagEnumOptions);
244 CGBINDOPT(DenormalFPMath);
245
246 static cl::opt<DenormalMode::DenormalModeKind> DenormalFP32Math(
247 "denormal-fp-math-f32",
248 cl::desc("Select which denormal numbers the code is permitted to require for float"),
249 cl::init(DenormalMode::Invalid),
250 DenormFlagEnumOptions);
251 CGBINDOPT(DenormalFP32Math);
252
253 static cl::opt<bool> EnableHonorSignDependentRoundingFPMath(
254 "enable-sign-dependent-rounding-fp-math", cl::Hidden,
255 cl::desc("Force codegen to assume rounding mode can change dynamically"),
256 cl::init(false));
257 CGBINDOPT(EnableHonorSignDependentRoundingFPMath);
258
259 static cl::opt<FloatABI::ABIType> FloatABIForCalls(
260 "float-abi", cl::desc("Choose float ABI type"),
261 cl::init(FloatABI::Default),
262 cl::values(clEnumValN(FloatABI::Default, "default",
263 "Target default float ABI type"),
264 clEnumValN(FloatABI::Soft, "soft",
265 "Soft float ABI (implied by -soft-float)"),
266 clEnumValN(FloatABI::Hard, "hard",
267 "Hard float ABI (uses FP registers)")));
268 CGBINDOPT(FloatABIForCalls);
269
270 static cl::opt<FPOpFusion::FPOpFusionMode> FuseFPOps(
271 "fp-contract", cl::desc("Enable aggressive formation of fused FP ops"),
272 cl::init(FPOpFusion::Standard),
273 cl::values(
274 clEnumValN(FPOpFusion::Fast, "fast",
275 "Fuse FP ops whenever profitable"),
276 clEnumValN(FPOpFusion::Standard, "on", "Only fuse 'blessed' FP ops."),
277 clEnumValN(FPOpFusion::Strict, "off",
278 "Only fuse FP ops when the result won't be affected.")));
279 CGBINDOPT(FuseFPOps);
280
281 static cl::opt<bool> DontPlaceZerosInBSS(
282 "nozero-initialized-in-bss",
283 cl::desc("Don't place zero-initialized symbols into bss section"),
284 cl::init(false));
285 CGBINDOPT(DontPlaceZerosInBSS);
286
287 static cl::opt<bool> EnableAIXExtendedAltivecABI(
288 "vec-extabi", cl::desc("Enable the AIX Extended Altivec ABI."),
289 cl::init(false));
290 CGBINDOPT(EnableAIXExtendedAltivecABI);
291
292 static cl::opt<bool> EnableGuaranteedTailCallOpt(
293 "tailcallopt",
294 cl::desc(
295 "Turn fastcc calls into tail calls by (potentially) changing ABI."),
296 cl::init(false));
297 CGBINDOPT(EnableGuaranteedTailCallOpt);
298
299 static cl::opt<bool> DisableTailCalls(
300 "disable-tail-calls", cl::desc("Never emit tail calls"), cl::init(false));
301 CGBINDOPT(DisableTailCalls);
302
303 static cl::opt<bool> StackSymbolOrdering(
304 "stack-symbol-ordering", cl::desc("Order local stack symbols."),
305 cl::init(true));
306 CGBINDOPT(StackSymbolOrdering);
307
308 static cl::opt<unsigned> OverrideStackAlignment(
309 "stack-alignment", cl::desc("Override default stack alignment"),
310 cl::init(0));
311 CGBINDOPT(OverrideStackAlignment);
312
313 static cl::opt<bool> StackRealign(
314 "stackrealign",
315 cl::desc("Force align the stack to the minimum alignment"),
316 cl::init(false));
317 CGBINDOPT(StackRealign);
318
319 static cl::opt<std::string> TrapFuncName(
320 "trap-func", cl::Hidden,
321 cl::desc("Emit a call to trap function rather than a trap instruction"),
322 cl::init(""));
323 CGBINDOPT(TrapFuncName);
324
325 static cl::opt<bool> UseCtors("use-ctors",
326 cl::desc("Use .ctors instead of .init_array."),
327 cl::init(false));
328 CGBINDOPT(UseCtors);
329
330 static cl::opt<bool> RelaxELFRelocations(
331 "relax-elf-relocations",
332 cl::desc(
333 "Emit GOTPCRELX/REX_GOTPCRELX instead of GOTPCREL on x86-64 ELF"),
334 cl::init(false));
335 CGBINDOPT(RelaxELFRelocations);
336
337 static cl::opt<bool> DataSections(
338 "data-sections", cl::desc("Emit data into separate sections"),
339 cl::init(false));
340 CGBINDOPT(DataSections);
341
342 static cl::opt<bool> FunctionSections(
343 "function-sections", cl::desc("Emit functions into separate sections"),
344 cl::init(false));
345 CGBINDOPT(FunctionSections);
346
347 static cl::opt<bool> IgnoreXCOFFVisibility(
348 "ignore-xcoff-visibility",
349 cl::desc("Not emit the visibility attribute for asm in AIX OS or give "
350 "all symbols 'unspecified' visibility in XCOFF object file"),
351 cl::init(false));
352 CGBINDOPT(IgnoreXCOFFVisibility);
353
354 static cl::opt<std::string> BBSections(
355 "basic-block-sections",
356 cl::desc("Emit basic blocks into separate sections"),
357 cl::value_desc("all | <function list (file)> | labels | none"),
358 cl::init("none"));
359 CGBINDOPT(BBSections);
360
361 static cl::opt<std::string> StackProtectorGuard(
362 "stack-protector-guard", cl::desc("Stack protector guard mode"),
363 cl::init("none"));
364 CGBINDOPT(StackProtectorGuard);
365
366 static cl::opt<std::string> StackProtectorGuardReg(
367 "stack-protector-guard-reg", cl::desc("Stack protector guard register"),
368 cl::init("none"));
369 CGBINDOPT(StackProtectorGuardReg);
370
371 static cl::opt<unsigned> StackProtectorGuardOffset(
372 "stack-protector-guard-offset", cl::desc("Stack protector guard offset"),
373 cl::init((unsigned)-1));
374 CGBINDOPT(StackProtectorGuardOffset);
375
376 static cl::opt<unsigned> TLSSize(
377 "tls-size", cl::desc("Bit size of immediate TLS offsets"), cl::init(0));
378 CGBINDOPT(TLSSize);
379
380 static cl::opt<bool> EmulatedTLS(
381 "emulated-tls", cl::desc("Use emulated TLS model"), cl::init(false));
382 CGBINDOPT(EmulatedTLS);
383
384 static cl::opt<bool> UniqueSectionNames(
385 "unique-section-names", cl::desc("Give unique names to every section"),
386 cl::init(true));
387 CGBINDOPT(UniqueSectionNames);
388
389 static cl::opt<bool> UniqueBasicBlockSectionNames(
390 "unique-basic-block-section-names",
391 cl::desc("Give unique names to every basic block section"),
392 cl::init(false));
393 CGBINDOPT(UniqueBasicBlockSectionNames);
394
395 static cl::opt<EABI> EABIVersion(
396 "meabi", cl::desc("Set EABI type (default depends on triple):"),
397 cl::init(EABI::Default),
398 cl::values(
399 clEnumValN(EABI::Default, "default", "Triple default EABI version"),
400 clEnumValN(EABI::EABI4, "4", "EABI version 4"),
401 clEnumValN(EABI::EABI5, "5", "EABI version 5"),
402 clEnumValN(EABI::GNU, "gnu", "EABI GNU")));
403 CGBINDOPT(EABIVersion);
404
405 static cl::opt<DebuggerKind> DebuggerTuningOpt(
406 "debugger-tune", cl::desc("Tune debug info for a particular debugger"),
407 cl::init(DebuggerKind::Default),
408 cl::values(
409 clEnumValN(DebuggerKind::GDB, "gdb", "gdb"),
410 clEnumValN(DebuggerKind::LLDB, "lldb", "lldb"),
411 clEnumValN(DebuggerKind::SCE, "sce", "SCE targets (e.g. PS4)")));
412 CGBINDOPT(DebuggerTuningOpt);
413
414 static cl::opt<bool> EnableStackSizeSection(
415 "stack-size-section",
416 cl::desc("Emit a section containing stack size metadata"),
417 cl::init(false));
418 CGBINDOPT(EnableStackSizeSection);
419
420 static cl::opt<bool> EnableAddrsig(
421 "addrsig", cl::desc("Emit an address-significance table"),
422 cl::init(false));
423 CGBINDOPT(EnableAddrsig);
424
425 static cl::opt<bool> EmitCallSiteInfo(
426 "emit-call-site-info",
427 cl::desc(
428 "Emit call site debug information, if debug information is enabled."),
429 cl::init(false));
430 CGBINDOPT(EmitCallSiteInfo);
431
432 static cl::opt<bool> EnableDebugEntryValues(
433 "debug-entry-values",
434 cl::desc("Enable debug info for the debug entry values."),
435 cl::init(false));
436 CGBINDOPT(EnableDebugEntryValues);
437
438 static cl::opt<bool> PseudoProbeForProfiling(
439 "pseudo-probe-for-profiling", cl::desc("Emit pseudo probes for AutoFDO"),
440 cl::init(false));
441 CGBINDOPT(PseudoProbeForProfiling);
442
443 static cl::opt<bool> ValueTrackingVariableLocations(
444 "experimental-debug-variable-locations",
445 cl::desc("Use experimental new value-tracking variable locations"),
446 cl::init(false));
447 CGBINDOPT(ValueTrackingVariableLocations);
448
449 static cl::opt<bool> EnableMachineFunctionSplitter(
450 "split-machine-functions",
451 cl::desc("Split out cold basic blocks from machine functions based on "
452 "profile information"),
453 cl::init(false));
454 CGBINDOPT(EnableMachineFunctionSplitter);
455
456 static cl::opt<bool> ForceDwarfFrameSection(
457 "force-dwarf-frame-section",
458 cl::desc("Always emit a debug frame section."), cl::init(false));
459 CGBINDOPT(ForceDwarfFrameSection);
460
461 static cl::opt<bool> XRayOmitFunctionIndex(
462 "no-xray-index", cl::desc("Don't emit xray_fn_idx section"),
463 cl::init(false));
464 CGBINDOPT(XRayOmitFunctionIndex);
465
466 #undef CGBINDOPT
467
468 mc::RegisterMCTargetOptionsFlags();
469 }
470
471 llvm::BasicBlockSection
getBBSectionsMode(llvm::TargetOptions & Options)472 codegen::getBBSectionsMode(llvm::TargetOptions &Options) {
473 if (getBBSections() == "all")
474 return BasicBlockSection::All;
475 else if (getBBSections() == "labels")
476 return BasicBlockSection::Labels;
477 else if (getBBSections() == "none")
478 return BasicBlockSection::None;
479 else {
480 ErrorOr<std::unique_ptr<MemoryBuffer>> MBOrErr =
481 MemoryBuffer::getFile(getBBSections());
482 if (!MBOrErr) {
483 errs() << "Error loading basic block sections function list file: "
484 << MBOrErr.getError().message() << "\n";
485 } else {
486 Options.BBSectionsFuncListBuf = std::move(*MBOrErr);
487 }
488 return BasicBlockSection::List;
489 }
490 }
491
492 llvm::StackProtectorGuards
getStackProtectorGuardMode(llvm::TargetOptions & Options)493 codegen::getStackProtectorGuardMode(llvm::TargetOptions &Options) {
494 if (getStackProtectorGuard() == "tls")
495 return StackProtectorGuards::TLS;
496 if (getStackProtectorGuard() == "global")
497 return StackProtectorGuards::Global;
498 if (getStackProtectorGuard() != "none") {
499 ErrorOr<std::unique_ptr<MemoryBuffer>> MBOrErr =
500 MemoryBuffer::getFile(getStackProtectorGuard());
501 if (!MBOrErr)
502 errs() << "error illegal stack protector guard mode: "
503 << MBOrErr.getError().message() << "\n";
504 else
505 Options.BBSectionsFuncListBuf = std::move(*MBOrErr);
506 }
507 return StackProtectorGuards::None;
508 }
509
510 // Common utility function tightly tied to the options listed here. Initializes
511 // a TargetOptions object with CodeGen flags and returns it.
512 TargetOptions
InitTargetOptionsFromCodeGenFlags(const Triple & TheTriple)513 codegen::InitTargetOptionsFromCodeGenFlags(const Triple &TheTriple) {
514 TargetOptions Options;
515 Options.AllowFPOpFusion = getFuseFPOps();
516 Options.UnsafeFPMath = getEnableUnsafeFPMath();
517 Options.NoInfsFPMath = getEnableNoInfsFPMath();
518 Options.NoNaNsFPMath = getEnableNoNaNsFPMath();
519 Options.NoSignedZerosFPMath = getEnableNoSignedZerosFPMath();
520 Options.NoTrappingFPMath = getEnableNoTrappingFPMath();
521
522 DenormalMode::DenormalModeKind DenormKind = getDenormalFPMath();
523
524 // FIXME: Should have separate input and output flags
525 Options.setFPDenormalMode(DenormalMode(DenormKind, DenormKind));
526
527 Options.HonorSignDependentRoundingFPMathOption =
528 getEnableHonorSignDependentRoundingFPMath();
529 if (getFloatABIForCalls() != FloatABI::Default)
530 Options.FloatABIType = getFloatABIForCalls();
531 Options.EnableAIXExtendedAltivecABI = getEnableAIXExtendedAltivecABI();
532 Options.NoZerosInBSS = getDontPlaceZerosInBSS();
533 Options.GuaranteedTailCallOpt = getEnableGuaranteedTailCallOpt();
534 Options.StackAlignmentOverride = getOverrideStackAlignment();
535 Options.StackSymbolOrdering = getStackSymbolOrdering();
536 Options.UseInitArray = !getUseCtors();
537 Options.RelaxELFRelocations = getRelaxELFRelocations();
538 Options.DataSections =
539 getExplicitDataSections().getValueOr(TheTriple.hasDefaultDataSections());
540 Options.FunctionSections = getFunctionSections();
541 Options.IgnoreXCOFFVisibility = getIgnoreXCOFFVisibility();
542 Options.BBSections = getBBSectionsMode(Options);
543 Options.UniqueSectionNames = getUniqueSectionNames();
544 Options.UniqueBasicBlockSectionNames = getUniqueBasicBlockSectionNames();
545 Options.StackProtectorGuard = getStackProtectorGuardMode(Options);
546 Options.StackProtectorGuardOffset = getStackProtectorGuardOffset();
547 Options.StackProtectorGuardReg = getStackProtectorGuardReg();
548 Options.TLSSize = getTLSSize();
549 Options.EmulatedTLS = getEmulatedTLS();
550 Options.ExplicitEmulatedTLS = EmulatedTLSView->getNumOccurrences() > 0;
551 Options.ExceptionModel = getExceptionModel();
552 Options.EmitStackSizeSection = getEnableStackSizeSection();
553 Options.EnableMachineFunctionSplitter = getEnableMachineFunctionSplitter();
554 Options.EmitAddrsig = getEnableAddrsig();
555 Options.EmitCallSiteInfo = getEmitCallSiteInfo();
556 Options.EnableDebugEntryValues = getEnableDebugEntryValues();
557 Options.PseudoProbeForProfiling = getPseudoProbeForProfiling();
558 Options.ValueTrackingVariableLocations = getValueTrackingVariableLocations();
559 Options.ForceDwarfFrameSection = getForceDwarfFrameSection();
560 Options.XRayOmitFunctionIndex = getXRayOmitFunctionIndex();
561
562 Options.MCOptions = mc::InitMCTargetOptionsFromFlags();
563
564 Options.ThreadModel = getThreadModel();
565 Options.EABIVersion = getEABIVersion();
566 Options.DebuggerTuning = getDebuggerTuningOpt();
567
568 return Options;
569 }
570
getCPUStr()571 std::string codegen::getCPUStr() {
572 // If user asked for the 'native' CPU, autodetect here. If autodection fails,
573 // this will set the CPU to an empty string which tells the target to
574 // pick a basic default.
575 if (getMCPU() == "native")
576 return std::string(sys::getHostCPUName());
577
578 return getMCPU();
579 }
580
getFeaturesStr()581 std::string codegen::getFeaturesStr() {
582 SubtargetFeatures Features;
583
584 // If user asked for the 'native' CPU, we need to autodetect features.
585 // This is necessary for x86 where the CPU might not support all the
586 // features the autodetected CPU name lists in the target. For example,
587 // not all Sandybridge processors support AVX.
588 if (getMCPU() == "native") {
589 StringMap<bool> HostFeatures;
590 if (sys::getHostCPUFeatures(HostFeatures))
591 for (auto &F : HostFeatures)
592 Features.AddFeature(F.first(), F.second);
593 }
594
595 for (auto const &MAttr : getMAttrs())
596 Features.AddFeature(MAttr);
597
598 return Features.getString();
599 }
600
getFeatureList()601 std::vector<std::string> codegen::getFeatureList() {
602 SubtargetFeatures Features;
603
604 // If user asked for the 'native' CPU, we need to autodetect features.
605 // This is necessary for x86 where the CPU might not support all the
606 // features the autodetected CPU name lists in the target. For example,
607 // not all Sandybridge processors support AVX.
608 if (getMCPU() == "native") {
609 StringMap<bool> HostFeatures;
610 if (sys::getHostCPUFeatures(HostFeatures))
611 for (auto &F : HostFeatures)
612 Features.AddFeature(F.first(), F.second);
613 }
614
615 for (auto const &MAttr : getMAttrs())
616 Features.AddFeature(MAttr);
617
618 return Features.getFeatures();
619 }
620
renderBoolStringAttr(AttrBuilder & B,StringRef Name,bool Val)621 void codegen::renderBoolStringAttr(AttrBuilder &B, StringRef Name, bool Val) {
622 B.addAttribute(Name, Val ? "true" : "false");
623 }
624
625 #define HANDLE_BOOL_ATTR(CL, AttrName) \
626 do { \
627 if (CL->getNumOccurrences() > 0 && !F.hasFnAttribute(AttrName)) \
628 renderBoolStringAttr(NewAttrs, AttrName, *CL); \
629 } while (0)
630
631 /// Set function attributes of function \p F based on CPU, Features, and command
632 /// line flags.
setFunctionAttributes(StringRef CPU,StringRef Features,Function & F)633 void codegen::setFunctionAttributes(StringRef CPU, StringRef Features,
634 Function &F) {
635 auto &Ctx = F.getContext();
636 AttributeList Attrs = F.getAttributes();
637 AttrBuilder NewAttrs;
638
639 if (!CPU.empty() && !F.hasFnAttribute("target-cpu"))
640 NewAttrs.addAttribute("target-cpu", CPU);
641 if (!Features.empty()) {
642 // Append the command line features to any that are already on the function.
643 StringRef OldFeatures =
644 F.getFnAttribute("target-features").getValueAsString();
645 if (OldFeatures.empty())
646 NewAttrs.addAttribute("target-features", Features);
647 else {
648 SmallString<256> Appended(OldFeatures);
649 Appended.push_back(',');
650 Appended.append(Features);
651 NewAttrs.addAttribute("target-features", Appended);
652 }
653 }
654 if (FramePointerUsageView->getNumOccurrences() > 0 &&
655 !F.hasFnAttribute("frame-pointer")) {
656 if (getFramePointerUsage() == FramePointer::All)
657 NewAttrs.addAttribute("frame-pointer", "all");
658 else if (getFramePointerUsage() == FramePointer::NonLeaf)
659 NewAttrs.addAttribute("frame-pointer", "non-leaf");
660 else if (getFramePointerUsage() == FramePointer::None)
661 NewAttrs.addAttribute("frame-pointer", "none");
662 }
663 if (DisableTailCallsView->getNumOccurrences() > 0)
664 NewAttrs.addAttribute("disable-tail-calls",
665 toStringRef(getDisableTailCalls()));
666 if (getStackRealign())
667 NewAttrs.addAttribute("stackrealign");
668
669 HANDLE_BOOL_ATTR(EnableUnsafeFPMathView, "unsafe-fp-math");
670 HANDLE_BOOL_ATTR(EnableNoInfsFPMathView, "no-infs-fp-math");
671 HANDLE_BOOL_ATTR(EnableNoNaNsFPMathView, "no-nans-fp-math");
672 HANDLE_BOOL_ATTR(EnableNoSignedZerosFPMathView, "no-signed-zeros-fp-math");
673
674 if (DenormalFPMathView->getNumOccurrences() > 0 &&
675 !F.hasFnAttribute("denormal-fp-math")) {
676 DenormalMode::DenormalModeKind DenormKind = getDenormalFPMath();
677
678 // FIXME: Command line flag should expose separate input/output modes.
679 NewAttrs.addAttribute("denormal-fp-math",
680 DenormalMode(DenormKind, DenormKind).str());
681 }
682
683 if (DenormalFP32MathView->getNumOccurrences() > 0 &&
684 !F.hasFnAttribute("denormal-fp-math-f32")) {
685 // FIXME: Command line flag should expose separate input/output modes.
686 DenormalMode::DenormalModeKind DenormKind = getDenormalFP32Math();
687
688 NewAttrs.addAttribute(
689 "denormal-fp-math-f32",
690 DenormalMode(DenormKind, DenormKind).str());
691 }
692
693 if (TrapFuncNameView->getNumOccurrences() > 0)
694 for (auto &B : F)
695 for (auto &I : B)
696 if (auto *Call = dyn_cast<CallInst>(&I))
697 if (const auto *F = Call->getCalledFunction())
698 if (F->getIntrinsicID() == Intrinsic::debugtrap ||
699 F->getIntrinsicID() == Intrinsic::trap)
700 Call->addAttribute(
701 AttributeList::FunctionIndex,
702 Attribute::get(Ctx, "trap-func-name", getTrapFuncName()));
703
704 // Let NewAttrs override Attrs.
705 F.setAttributes(
706 Attrs.addAttributes(Ctx, AttributeList::FunctionIndex, NewAttrs));
707 }
708
709 /// Set function attributes of functions in Module M based on CPU,
710 /// Features, and command line flags.
setFunctionAttributes(StringRef CPU,StringRef Features,Module & M)711 void codegen::setFunctionAttributes(StringRef CPU, StringRef Features,
712 Module &M) {
713 for (Function &F : M)
714 setFunctionAttributes(CPU, Features, F);
715 }
716