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(unsigned, OverrideStackAlignment)
73 CGOPT(bool, StackRealign)
74 CGOPT(std::string, TrapFuncName)
75 CGOPT(bool, UseCtors)
76 CGOPT(bool, RelaxELFRelocations)
77 CGOPT_EXP(bool, DataSections)
78 CGOPT_EXP(bool, FunctionSections)
79 CGOPT(bool, IgnoreXCOFFVisibility)
80 CGOPT(bool, XCOFFTracebackTable)
81 CGOPT(std::string, BBSections)
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, PseudoProbeForProfiling)
94 CGOPT(bool, ValueTrackingVariableLocations)
95 CGOPT(bool, ForceDwarfFrameSection)
96 CGOPT(bool, XRayOmitFunctionIndex)
97 CGOPT(bool, DebugStrictDwarf)
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<FramePointerKind> FramePointerUsage(
185 "frame-pointer",
186 cl::desc("Specify frame pointer elimination optimization"),
187 cl::init(FramePointerKind::None),
188 cl::values(
189 clEnumValN(FramePointerKind::All, "all",
190 "Disable frame pointer elimination"),
191 clEnumValN(FramePointerKind::NonLeaf, "non-leaf",
192 "Disable frame pointer elimination for non-leaf frame"),
193 clEnumValN(FramePointerKind::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<bool> XCOFFTracebackTable(
355 "xcoff-traceback-table", cl::desc("Emit the XCOFF traceback table"),
356 cl::init(true));
357 CGBINDOPT(XCOFFTracebackTable);
358
359 static cl::opt<std::string> BBSections(
360 "basic-block-sections",
361 cl::desc("Emit basic blocks into separate sections"),
362 cl::value_desc("all | <function list (file)> | labels | none"),
363 cl::init("none"));
364 CGBINDOPT(BBSections);
365
366 static cl::opt<unsigned> TLSSize(
367 "tls-size", cl::desc("Bit size of immediate TLS offsets"), cl::init(0));
368 CGBINDOPT(TLSSize);
369
370 static cl::opt<bool> EmulatedTLS(
371 "emulated-tls", cl::desc("Use emulated TLS model"), cl::init(false));
372 CGBINDOPT(EmulatedTLS);
373
374 static cl::opt<bool> UniqueSectionNames(
375 "unique-section-names", cl::desc("Give unique names to every section"),
376 cl::init(true));
377 CGBINDOPT(UniqueSectionNames);
378
379 static cl::opt<bool> UniqueBasicBlockSectionNames(
380 "unique-basic-block-section-names",
381 cl::desc("Give unique names to every basic block section"),
382 cl::init(false));
383 CGBINDOPT(UniqueBasicBlockSectionNames);
384
385 static cl::opt<EABI> EABIVersion(
386 "meabi", cl::desc("Set EABI type (default depends on triple):"),
387 cl::init(EABI::Default),
388 cl::values(
389 clEnumValN(EABI::Default, "default", "Triple default EABI version"),
390 clEnumValN(EABI::EABI4, "4", "EABI version 4"),
391 clEnumValN(EABI::EABI5, "5", "EABI version 5"),
392 clEnumValN(EABI::GNU, "gnu", "EABI GNU")));
393 CGBINDOPT(EABIVersion);
394
395 static cl::opt<DebuggerKind> DebuggerTuningOpt(
396 "debugger-tune", cl::desc("Tune debug info for a particular debugger"),
397 cl::init(DebuggerKind::Default),
398 cl::values(
399 clEnumValN(DebuggerKind::GDB, "gdb", "gdb"),
400 clEnumValN(DebuggerKind::LLDB, "lldb", "lldb"),
401 clEnumValN(DebuggerKind::DBX, "dbx", "dbx"),
402 clEnumValN(DebuggerKind::SCE, "sce", "SCE targets (e.g. PS4)")));
403 CGBINDOPT(DebuggerTuningOpt);
404
405 static cl::opt<bool> EnableStackSizeSection(
406 "stack-size-section",
407 cl::desc("Emit a section containing stack size metadata"),
408 cl::init(false));
409 CGBINDOPT(EnableStackSizeSection);
410
411 static cl::opt<bool> EnableAddrsig(
412 "addrsig", cl::desc("Emit an address-significance table"),
413 cl::init(false));
414 CGBINDOPT(EnableAddrsig);
415
416 static cl::opt<bool> EmitCallSiteInfo(
417 "emit-call-site-info",
418 cl::desc(
419 "Emit call site debug information, if debug information is enabled."),
420 cl::init(false));
421 CGBINDOPT(EmitCallSiteInfo);
422
423 static cl::opt<bool> EnableDebugEntryValues(
424 "debug-entry-values",
425 cl::desc("Enable debug info for the debug entry values."),
426 cl::init(false));
427 CGBINDOPT(EnableDebugEntryValues);
428
429 static cl::opt<bool> PseudoProbeForProfiling(
430 "pseudo-probe-for-profiling", cl::desc("Emit pseudo probes for AutoFDO"),
431 cl::init(false));
432 CGBINDOPT(PseudoProbeForProfiling);
433
434 static cl::opt<bool> ValueTrackingVariableLocations(
435 "experimental-debug-variable-locations",
436 cl::desc("Use experimental new value-tracking variable locations"),
437 cl::init(false));
438 CGBINDOPT(ValueTrackingVariableLocations);
439
440 static cl::opt<bool> EnableMachineFunctionSplitter(
441 "split-machine-functions",
442 cl::desc("Split out cold basic blocks from machine functions based on "
443 "profile information"),
444 cl::init(false));
445 CGBINDOPT(EnableMachineFunctionSplitter);
446
447 static cl::opt<bool> ForceDwarfFrameSection(
448 "force-dwarf-frame-section",
449 cl::desc("Always emit a debug frame section."), cl::init(false));
450 CGBINDOPT(ForceDwarfFrameSection);
451
452 static cl::opt<bool> XRayOmitFunctionIndex(
453 "no-xray-index", cl::desc("Don't emit xray_fn_idx section"),
454 cl::init(false));
455 CGBINDOPT(XRayOmitFunctionIndex);
456
457 static cl::opt<bool> DebugStrictDwarf(
458 "strict-dwarf", cl::desc("use strict dwarf"), cl::init(false));
459 CGBINDOPT(DebugStrictDwarf);
460
461 #undef CGBINDOPT
462
463 mc::RegisterMCTargetOptionsFlags();
464 }
465
466 llvm::BasicBlockSection
getBBSectionsMode(llvm::TargetOptions & Options)467 codegen::getBBSectionsMode(llvm::TargetOptions &Options) {
468 if (getBBSections() == "all")
469 return BasicBlockSection::All;
470 else if (getBBSections() == "labels")
471 return BasicBlockSection::Labels;
472 else if (getBBSections() == "none")
473 return BasicBlockSection::None;
474 else {
475 ErrorOr<std::unique_ptr<MemoryBuffer>> MBOrErr =
476 MemoryBuffer::getFile(getBBSections());
477 if (!MBOrErr) {
478 errs() << "Error loading basic block sections function list file: "
479 << MBOrErr.getError().message() << "\n";
480 } else {
481 Options.BBSectionsFuncListBuf = std::move(*MBOrErr);
482 }
483 return BasicBlockSection::List;
484 }
485 }
486
487 // Common utility function tightly tied to the options listed here. Initializes
488 // a TargetOptions object with CodeGen flags and returns it.
489 TargetOptions
InitTargetOptionsFromCodeGenFlags(const Triple & TheTriple)490 codegen::InitTargetOptionsFromCodeGenFlags(const Triple &TheTriple) {
491 TargetOptions Options;
492 Options.AllowFPOpFusion = getFuseFPOps();
493 Options.UnsafeFPMath = getEnableUnsafeFPMath();
494 Options.NoInfsFPMath = getEnableNoInfsFPMath();
495 Options.NoNaNsFPMath = getEnableNoNaNsFPMath();
496 Options.NoSignedZerosFPMath = getEnableNoSignedZerosFPMath();
497 Options.NoTrappingFPMath = getEnableNoTrappingFPMath();
498
499 DenormalMode::DenormalModeKind DenormKind = getDenormalFPMath();
500
501 // FIXME: Should have separate input and output flags
502 Options.setFPDenormalMode(DenormalMode(DenormKind, DenormKind));
503
504 Options.HonorSignDependentRoundingFPMathOption =
505 getEnableHonorSignDependentRoundingFPMath();
506 if (getFloatABIForCalls() != FloatABI::Default)
507 Options.FloatABIType = getFloatABIForCalls();
508 Options.EnableAIXExtendedAltivecABI = getEnableAIXExtendedAltivecABI();
509 Options.NoZerosInBSS = getDontPlaceZerosInBSS();
510 Options.GuaranteedTailCallOpt = getEnableGuaranteedTailCallOpt();
511 Options.StackAlignmentOverride = getOverrideStackAlignment();
512 Options.StackSymbolOrdering = getStackSymbolOrdering();
513 Options.UseInitArray = !getUseCtors();
514 Options.RelaxELFRelocations = getRelaxELFRelocations();
515 Options.DataSections =
516 getExplicitDataSections().getValueOr(TheTriple.hasDefaultDataSections());
517 Options.FunctionSections = getFunctionSections();
518 Options.IgnoreXCOFFVisibility = getIgnoreXCOFFVisibility();
519 Options.XCOFFTracebackTable = getXCOFFTracebackTable();
520 Options.BBSections = getBBSectionsMode(Options);
521 Options.UniqueSectionNames = getUniqueSectionNames();
522 Options.UniqueBasicBlockSectionNames = getUniqueBasicBlockSectionNames();
523 Options.TLSSize = getTLSSize();
524 Options.EmulatedTLS = getEmulatedTLS();
525 Options.ExplicitEmulatedTLS = EmulatedTLSView->getNumOccurrences() > 0;
526 Options.ExceptionModel = getExceptionModel();
527 Options.EmitStackSizeSection = getEnableStackSizeSection();
528 Options.EnableMachineFunctionSplitter = getEnableMachineFunctionSplitter();
529 Options.EmitAddrsig = getEnableAddrsig();
530 Options.EmitCallSiteInfo = getEmitCallSiteInfo();
531 Options.EnableDebugEntryValues = getEnableDebugEntryValues();
532 Options.PseudoProbeForProfiling = getPseudoProbeForProfiling();
533 Options.ValueTrackingVariableLocations = getValueTrackingVariableLocations();
534 Options.ForceDwarfFrameSection = getForceDwarfFrameSection();
535 Options.XRayOmitFunctionIndex = getXRayOmitFunctionIndex();
536 Options.DebugStrictDwarf = getDebugStrictDwarf();
537
538 Options.MCOptions = mc::InitMCTargetOptionsFromFlags();
539
540 Options.ThreadModel = getThreadModel();
541 Options.EABIVersion = getEABIVersion();
542 Options.DebuggerTuning = getDebuggerTuningOpt();
543
544 return Options;
545 }
546
getCPUStr()547 std::string codegen::getCPUStr() {
548 // If user asked for the 'native' CPU, autodetect here. If autodection fails,
549 // this will set the CPU to an empty string which tells the target to
550 // pick a basic default.
551 if (getMCPU() == "native")
552 return std::string(sys::getHostCPUName());
553
554 return getMCPU();
555 }
556
getFeaturesStr()557 std::string codegen::getFeaturesStr() {
558 SubtargetFeatures Features;
559
560 // If user asked for the 'native' CPU, we need to autodetect features.
561 // This is necessary for x86 where the CPU might not support all the
562 // features the autodetected CPU name lists in the target. For example,
563 // not all Sandybridge processors support AVX.
564 if (getMCPU() == "native") {
565 StringMap<bool> HostFeatures;
566 if (sys::getHostCPUFeatures(HostFeatures))
567 for (auto &F : HostFeatures)
568 Features.AddFeature(F.first(), F.second);
569 }
570
571 for (auto const &MAttr : getMAttrs())
572 Features.AddFeature(MAttr);
573
574 return Features.getString();
575 }
576
getFeatureList()577 std::vector<std::string> codegen::getFeatureList() {
578 SubtargetFeatures Features;
579
580 // If user asked for the 'native' CPU, we need to autodetect features.
581 // This is necessary for x86 where the CPU might not support all the
582 // features the autodetected CPU name lists in the target. For example,
583 // not all Sandybridge processors support AVX.
584 if (getMCPU() == "native") {
585 StringMap<bool> HostFeatures;
586 if (sys::getHostCPUFeatures(HostFeatures))
587 for (auto &F : HostFeatures)
588 Features.AddFeature(F.first(), F.second);
589 }
590
591 for (auto const &MAttr : getMAttrs())
592 Features.AddFeature(MAttr);
593
594 return Features.getFeatures();
595 }
596
renderBoolStringAttr(AttrBuilder & B,StringRef Name,bool Val)597 void codegen::renderBoolStringAttr(AttrBuilder &B, StringRef Name, bool Val) {
598 B.addAttribute(Name, Val ? "true" : "false");
599 }
600
601 #define HANDLE_BOOL_ATTR(CL, AttrName) \
602 do { \
603 if (CL->getNumOccurrences() > 0 && !F.hasFnAttribute(AttrName)) \
604 renderBoolStringAttr(NewAttrs, AttrName, *CL); \
605 } while (0)
606
607 /// Set function attributes of function \p F based on CPU, Features, and command
608 /// line flags.
setFunctionAttributes(StringRef CPU,StringRef Features,Function & F)609 void codegen::setFunctionAttributes(StringRef CPU, StringRef Features,
610 Function &F) {
611 auto &Ctx = F.getContext();
612 AttributeList Attrs = F.getAttributes();
613 AttrBuilder NewAttrs;
614
615 if (!CPU.empty() && !F.hasFnAttribute("target-cpu"))
616 NewAttrs.addAttribute("target-cpu", CPU);
617 if (!Features.empty()) {
618 // Append the command line features to any that are already on the function.
619 StringRef OldFeatures =
620 F.getFnAttribute("target-features").getValueAsString();
621 if (OldFeatures.empty())
622 NewAttrs.addAttribute("target-features", Features);
623 else {
624 SmallString<256> Appended(OldFeatures);
625 Appended.push_back(',');
626 Appended.append(Features);
627 NewAttrs.addAttribute("target-features", Appended);
628 }
629 }
630 if (FramePointerUsageView->getNumOccurrences() > 0 &&
631 !F.hasFnAttribute("frame-pointer")) {
632 if (getFramePointerUsage() == FramePointerKind::All)
633 NewAttrs.addAttribute("frame-pointer", "all");
634 else if (getFramePointerUsage() == FramePointerKind::NonLeaf)
635 NewAttrs.addAttribute("frame-pointer", "non-leaf");
636 else if (getFramePointerUsage() == FramePointerKind::None)
637 NewAttrs.addAttribute("frame-pointer", "none");
638 }
639 if (DisableTailCallsView->getNumOccurrences() > 0)
640 NewAttrs.addAttribute("disable-tail-calls",
641 toStringRef(getDisableTailCalls()));
642 if (getStackRealign())
643 NewAttrs.addAttribute("stackrealign");
644
645 HANDLE_BOOL_ATTR(EnableUnsafeFPMathView, "unsafe-fp-math");
646 HANDLE_BOOL_ATTR(EnableNoInfsFPMathView, "no-infs-fp-math");
647 HANDLE_BOOL_ATTR(EnableNoNaNsFPMathView, "no-nans-fp-math");
648 HANDLE_BOOL_ATTR(EnableNoSignedZerosFPMathView, "no-signed-zeros-fp-math");
649
650 if (DenormalFPMathView->getNumOccurrences() > 0 &&
651 !F.hasFnAttribute("denormal-fp-math")) {
652 DenormalMode::DenormalModeKind DenormKind = getDenormalFPMath();
653
654 // FIXME: Command line flag should expose separate input/output modes.
655 NewAttrs.addAttribute("denormal-fp-math",
656 DenormalMode(DenormKind, DenormKind).str());
657 }
658
659 if (DenormalFP32MathView->getNumOccurrences() > 0 &&
660 !F.hasFnAttribute("denormal-fp-math-f32")) {
661 // FIXME: Command line flag should expose separate input/output modes.
662 DenormalMode::DenormalModeKind DenormKind = getDenormalFP32Math();
663
664 NewAttrs.addAttribute(
665 "denormal-fp-math-f32",
666 DenormalMode(DenormKind, DenormKind).str());
667 }
668
669 if (TrapFuncNameView->getNumOccurrences() > 0)
670 for (auto &B : F)
671 for (auto &I : B)
672 if (auto *Call = dyn_cast<CallInst>(&I))
673 if (const auto *F = Call->getCalledFunction())
674 if (F->getIntrinsicID() == Intrinsic::debugtrap ||
675 F->getIntrinsicID() == Intrinsic::trap)
676 Call->addAttribute(
677 AttributeList::FunctionIndex,
678 Attribute::get(Ctx, "trap-func-name", getTrapFuncName()));
679
680 // Let NewAttrs override Attrs.
681 F.setAttributes(
682 Attrs.addAttributes(Ctx, AttributeList::FunctionIndex, NewAttrs));
683 }
684
685 /// Set function attributes of functions in Module M based on CPU,
686 /// Features, and command line flags.
setFunctionAttributes(StringRef CPU,StringRef Features,Module & M)687 void codegen::setFunctionAttributes(StringRef CPU, StringRef Features,
688 Module &M) {
689 for (Function &F : M)
690 setFunctionAttributes(CPU, Features, F);
691 }
692