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