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