xref: /openbsd-src/gnu/llvm/llvm/tools/lto/lto.cpp (revision 53555c846a0a6f917dbd0a191f826da995ab1c42) 
1 //===-lto.cpp - LLVM Link Time Optimizer ----------------------------------===//
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 implements the Link Time Optimization library. This library is
10 // intended to be used by linker to optimize code at link time.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "llvm-c/lto.h"
15 #include "llvm/ADT/STLExtras.h"
16 #include "llvm/ADT/StringExtras.h"
17 #include "llvm/Bitcode/BitcodeReader.h"
18 #include "llvm/CodeGen/CommandFlags.h"
19 #include "llvm/IR/DiagnosticInfo.h"
20 #include "llvm/IR/DiagnosticPrinter.h"
21 #include "llvm/IR/LLVMContext.h"
22 #include "llvm/LTO/LTO.h"
23 #include "llvm/LTO/legacy/LTOCodeGenerator.h"
24 #include "llvm/LTO/legacy/LTOModule.h"
25 #include "llvm/LTO/legacy/ThinLTOCodeGenerator.h"
26 #include "llvm/Support/MemoryBuffer.h"
27 #include "llvm/Support/Signals.h"
28 #include "llvm/Support/TargetSelect.h"
29 #include "llvm/Support/raw_ostream.h"
30 
31 using namespace llvm;
32 
33 static codegen::RegisterCodeGenFlags CGF;
34 
35 // extra command-line flags needed for LTOCodeGenerator
36 static cl::opt<char>
37     OptLevel("O",
38              cl::desc("Optimization level. [-O0, -O1, -O2, or -O3] "
39                       "(default = '-O2')"),
40              cl::Prefix, cl::init('2'));
41 
42 static cl::opt<bool> EnableFreestanding(
43     "lto-freestanding", cl::init(false),
44     cl::desc("Enable Freestanding (disable builtins / TLI) during LTO"));
45 
46 #ifdef NDEBUG
47 static bool VerifyByDefault = false;
48 #else
49 static bool VerifyByDefault = true;
50 #endif
51 
52 static cl::opt<bool> DisableVerify(
53     "disable-llvm-verifier", cl::init(!VerifyByDefault),
54     cl::desc("Don't run the LLVM verifier during the optimization pipeline"));
55 
56 // Holds most recent error string.
57 // *** Not thread safe ***
58 static std::string sLastErrorString;
59 
60 // Holds the initialization state of the LTO module.
61 // *** Not thread safe ***
62 static bool initialized = false;
63 
64 // Represent the state of parsing command line debug options.
65 static enum class OptParsingState {
66   NotParsed, // Initial state.
67   Early,     // After lto_set_debug_options is called.
68   Done       // After maybeParseOptions is called.
69 } optionParsingState = OptParsingState::NotParsed;
70 
71 static LLVMContext *LTOContext = nullptr;
72 
73 struct LTOToolDiagnosticHandler : public DiagnosticHandler {
74   bool handleDiagnostics(const DiagnosticInfo &DI) override {
75     if (DI.getSeverity() != DS_Error) {
76       DiagnosticPrinterRawOStream DP(errs());
77       DI.print(DP);
78       errs() << '\n';
79       return true;
80     }
81     sLastErrorString = "";
82     {
83       raw_string_ostream Stream(sLastErrorString);
84       DiagnosticPrinterRawOStream DP(Stream);
85       DI.print(DP);
86     }
87     return true;
88   }
89 };
90 
91 // Initialize the configured targets if they have not been initialized.
92 static void lto_initialize() {
93   if (!initialized) {
94 #ifdef _WIN32
95     // Dialog box on crash disabling doesn't work across DLL boundaries, so do
96     // it here.
97     llvm::sys::DisableSystemDialogsOnCrash();
98 #endif
99 
100     InitializeAllTargetInfos();
101     InitializeAllTargets();
102     InitializeAllTargetMCs();
103     InitializeAllAsmParsers();
104     InitializeAllAsmPrinters();
105     InitializeAllDisassemblers();
106 
107     static LLVMContext Context;
108     LTOContext = &Context;
109     LTOContext->setDiagnosticHandler(
110         std::make_unique<LTOToolDiagnosticHandler>(), true);
111     initialized = true;
112   }
113 }
114 
115 namespace {
116 
117 static void handleLibLTODiagnostic(lto_codegen_diagnostic_severity_t Severity,
118                                    const char *Msg, void *) {
119   sLastErrorString = Msg;
120 }
121 
122 // This derived class owns the native object file. This helps implement the
123 // libLTO API semantics, which require that the code generator owns the object
124 // file.
125 struct LibLTOCodeGenerator : LTOCodeGenerator {
126   LibLTOCodeGenerator() : LTOCodeGenerator(*LTOContext) { init(); }
127   LibLTOCodeGenerator(std::unique_ptr<LLVMContext> Context)
128       : LTOCodeGenerator(*Context), OwnedContext(std::move(Context)) {
129     init();
130   }
131 
132   // Reset the module first in case MergedModule is created in OwnedContext.
133   // Module must be destructed before its context gets destructed.
134   ~LibLTOCodeGenerator() { resetMergedModule(); }
135 
136   void init() { setDiagnosticHandler(handleLibLTODiagnostic, nullptr); }
137 
138   std::unique_ptr<MemoryBuffer> NativeObjectFile;
139   std::unique_ptr<LLVMContext> OwnedContext;
140 };
141 
142 }
143 
144 DEFINE_SIMPLE_CONVERSION_FUNCTIONS(LibLTOCodeGenerator, lto_code_gen_t)
145 DEFINE_SIMPLE_CONVERSION_FUNCTIONS(ThinLTOCodeGenerator, thinlto_code_gen_t)
146 DEFINE_SIMPLE_CONVERSION_FUNCTIONS(LTOModule, lto_module_t)
147 
148 // Convert the subtarget features into a string to pass to LTOCodeGenerator.
149 static void lto_add_attrs(lto_code_gen_t cg) {
150   LTOCodeGenerator *CG = unwrap(cg);
151   CG->setAttrs(codegen::getMAttrs());
152 
153   if (OptLevel < '0' || OptLevel > '3')
154     report_fatal_error("Optimization level must be between 0 and 3");
155   CG->setOptLevel(OptLevel - '0');
156   CG->setFreestanding(EnableFreestanding);
157   CG->setDisableVerify(DisableVerify);
158 }
159 
160 extern const char* lto_get_version() {
161   return LTOCodeGenerator::getVersionString();
162 }
163 
164 const char* lto_get_error_message() {
165   return sLastErrorString.c_str();
166 }
167 
168 bool lto_module_is_object_file(const char* path) {
169   return LTOModule::isBitcodeFile(StringRef(path));
170 }
171 
172 bool lto_module_is_object_file_for_target(const char* path,
173                                           const char* target_triplet_prefix) {
174   ErrorOr<std::unique_ptr<MemoryBuffer>> Buffer = MemoryBuffer::getFile(path);
175   if (!Buffer)
176     return false;
177   return LTOModule::isBitcodeForTarget(Buffer->get(),
178                                        StringRef(target_triplet_prefix));
179 }
180 
181 bool lto_module_has_objc_category(const void *mem, size_t length) {
182   std::unique_ptr<MemoryBuffer> Buffer(LTOModule::makeBuffer(mem, length));
183   if (!Buffer)
184     return false;
185   LLVMContext Ctx;
186   ErrorOr<bool> Result = expectedToErrorOrAndEmitErrors(
187       Ctx, llvm::isBitcodeContainingObjCCategory(*Buffer));
188   return Result && *Result;
189 }
190 
191 bool lto_module_is_object_file_in_memory(const void* mem, size_t length) {
192   return LTOModule::isBitcodeFile(mem, length);
193 }
194 
195 bool
196 lto_module_is_object_file_in_memory_for_target(const void* mem,
197                                             size_t length,
198                                             const char* target_triplet_prefix) {
199   std::unique_ptr<MemoryBuffer> buffer(LTOModule::makeBuffer(mem, length));
200   if (!buffer)
201     return false;
202   return LTOModule::isBitcodeForTarget(buffer.get(),
203                                        StringRef(target_triplet_prefix));
204 }
205 
206 lto_module_t lto_module_create(const char* path) {
207   lto_initialize();
208   llvm::TargetOptions Options =
209       codegen::InitTargetOptionsFromCodeGenFlags(Triple());
210   ErrorOr<std::unique_ptr<LTOModule>> M =
211       LTOModule::createFromFile(*LTOContext, StringRef(path), Options);
212   if (!M)
213     return nullptr;
214   return wrap(M->release());
215 }
216 
217 lto_module_t lto_module_create_from_fd(int fd, const char *path, size_t size) {
218   lto_initialize();
219   llvm::TargetOptions Options =
220       codegen::InitTargetOptionsFromCodeGenFlags(Triple());
221   ErrorOr<std::unique_ptr<LTOModule>> M = LTOModule::createFromOpenFile(
222       *LTOContext, fd, StringRef(path), size, Options);
223   if (!M)
224     return nullptr;
225   return wrap(M->release());
226 }
227 
228 lto_module_t lto_module_create_from_fd_at_offset(int fd, const char *path,
229                                                  size_t file_size,
230                                                  size_t map_size,
231                                                  off_t offset) {
232   lto_initialize();
233   llvm::TargetOptions Options =
234       codegen::InitTargetOptionsFromCodeGenFlags(Triple());
235   ErrorOr<std::unique_ptr<LTOModule>> M = LTOModule::createFromOpenFileSlice(
236       *LTOContext, fd, StringRef(path), map_size, offset, Options);
237   if (!M)
238     return nullptr;
239   return wrap(M->release());
240 }
241 
242 lto_module_t lto_module_create_from_memory(const void* mem, size_t length) {
243   lto_initialize();
244   llvm::TargetOptions Options =
245       codegen::InitTargetOptionsFromCodeGenFlags(Triple());
246   ErrorOr<std::unique_ptr<LTOModule>> M =
247       LTOModule::createFromBuffer(*LTOContext, mem, length, Options);
248   if (!M)
249     return nullptr;
250   return wrap(M->release());
251 }
252 
253 lto_module_t lto_module_create_from_memory_with_path(const void* mem,
254                                                      size_t length,
255                                                      const char *path) {
256   lto_initialize();
257   llvm::TargetOptions Options =
258       codegen::InitTargetOptionsFromCodeGenFlags(Triple());
259   ErrorOr<std::unique_ptr<LTOModule>> M = LTOModule::createFromBuffer(
260       *LTOContext, mem, length, Options, StringRef(path));
261   if (!M)
262     return nullptr;
263   return wrap(M->release());
264 }
265 
266 lto_module_t lto_module_create_in_local_context(const void *mem, size_t length,
267                                                 const char *path) {
268   lto_initialize();
269   llvm::TargetOptions Options =
270       codegen::InitTargetOptionsFromCodeGenFlags(Triple());
271 
272   // Create a local context. Ownership will be transferred to LTOModule.
273   std::unique_ptr<LLVMContext> Context = std::make_unique<LLVMContext>();
274   Context->setDiagnosticHandler(std::make_unique<LTOToolDiagnosticHandler>(),
275                                 true);
276 
277   ErrorOr<std::unique_ptr<LTOModule>> M = LTOModule::createInLocalContext(
278       std::move(Context), mem, length, Options, StringRef(path));
279   if (!M)
280     return nullptr;
281   return wrap(M->release());
282 }
283 
284 lto_module_t lto_module_create_in_codegen_context(const void *mem,
285                                                   size_t length,
286                                                   const char *path,
287                                                   lto_code_gen_t cg) {
288   lto_initialize();
289   llvm::TargetOptions Options =
290       codegen::InitTargetOptionsFromCodeGenFlags(Triple());
291   ErrorOr<std::unique_ptr<LTOModule>> M = LTOModule::createFromBuffer(
292       unwrap(cg)->getContext(), mem, length, Options, StringRef(path));
293   if (!M)
294     return nullptr;
295   return wrap(M->release());
296 }
297 
298 void lto_module_dispose(lto_module_t mod) { delete unwrap(mod); }
299 
300 const char* lto_module_get_target_triple(lto_module_t mod) {
301   return unwrap(mod)->getTargetTriple().c_str();
302 }
303 
304 void lto_module_set_target_triple(lto_module_t mod, const char *triple) {
305   return unwrap(mod)->setTargetTriple(StringRef(triple));
306 }
307 
308 unsigned int lto_module_get_num_symbols(lto_module_t mod) {
309   return unwrap(mod)->getSymbolCount();
310 }
311 
312 const char* lto_module_get_symbol_name(lto_module_t mod, unsigned int index) {
313   return unwrap(mod)->getSymbolName(index).data();
314 }
315 
316 lto_symbol_attributes lto_module_get_symbol_attribute(lto_module_t mod,
317                                                       unsigned int index) {
318   return unwrap(mod)->getSymbolAttributes(index);
319 }
320 
321 const char* lto_module_get_linkeropts(lto_module_t mod) {
322   return unwrap(mod)->getLinkerOpts().data();
323 }
324 
325 lto_bool_t lto_module_get_macho_cputype(lto_module_t mod,
326                                         unsigned int *out_cputype,
327                                         unsigned int *out_cpusubtype) {
328   LTOModule *M = unwrap(mod);
329   Expected<uint32_t> CPUType = M->getMachOCPUType();
330   if (!CPUType) {
331     sLastErrorString = toString(CPUType.takeError());
332     return true;
333   }
334   *out_cputype = *CPUType;
335 
336   Expected<uint32_t> CPUSubType = M->getMachOCPUSubType();
337   if (!CPUSubType) {
338     sLastErrorString = toString(CPUSubType.takeError());
339     return true;
340   }
341   *out_cpusubtype = *CPUSubType;
342 
343   return false;
344 }
345 
346 void lto_codegen_set_diagnostic_handler(lto_code_gen_t cg,
347                                         lto_diagnostic_handler_t diag_handler,
348                                         void *ctxt) {
349   unwrap(cg)->setDiagnosticHandler(diag_handler, ctxt);
350 }
351 
352 static lto_code_gen_t createCodeGen(bool InLocalContext) {
353   lto_initialize();
354 
355   TargetOptions Options = codegen::InitTargetOptionsFromCodeGenFlags(Triple());
356 
357   LibLTOCodeGenerator *CodeGen =
358       InLocalContext ? new LibLTOCodeGenerator(std::make_unique<LLVMContext>())
359                      : new LibLTOCodeGenerator();
360   CodeGen->setTargetOptions(Options);
361   return wrap(CodeGen);
362 }
363 
364 lto_code_gen_t lto_codegen_create(void) {
365   return createCodeGen(/* InLocalContext */ false);
366 }
367 
368 lto_code_gen_t lto_codegen_create_in_local_context(void) {
369   return createCodeGen(/* InLocalContext */ true);
370 }
371 
372 void lto_codegen_dispose(lto_code_gen_t cg) { delete unwrap(cg); }
373 
374 bool lto_codegen_add_module(lto_code_gen_t cg, lto_module_t mod) {
375   return !unwrap(cg)->addModule(unwrap(mod));
376 }
377 
378 void lto_codegen_set_module(lto_code_gen_t cg, lto_module_t mod) {
379   unwrap(cg)->setModule(std::unique_ptr<LTOModule>(unwrap(mod)));
380 }
381 
382 bool lto_codegen_set_debug_model(lto_code_gen_t cg, lto_debug_model debug) {
383   unwrap(cg)->setDebugInfo(debug);
384   return false;
385 }
386 
387 bool lto_codegen_set_pic_model(lto_code_gen_t cg, lto_codegen_model model) {
388   switch (model) {
389   case LTO_CODEGEN_PIC_MODEL_STATIC:
390     unwrap(cg)->setCodePICModel(Reloc::Static);
391     return false;
392   case LTO_CODEGEN_PIC_MODEL_DYNAMIC:
393     unwrap(cg)->setCodePICModel(Reloc::PIC_);
394     return false;
395   case LTO_CODEGEN_PIC_MODEL_DYNAMIC_NO_PIC:
396     unwrap(cg)->setCodePICModel(Reloc::DynamicNoPIC);
397     return false;
398   case LTO_CODEGEN_PIC_MODEL_DEFAULT:
399     unwrap(cg)->setCodePICModel(std::nullopt);
400     return false;
401   }
402   sLastErrorString = "Unknown PIC model";
403   return true;
404 }
405 
406 void lto_codegen_set_cpu(lto_code_gen_t cg, const char *cpu) {
407   return unwrap(cg)->setCpu(cpu);
408 }
409 
410 void lto_codegen_set_assembler_path(lto_code_gen_t cg, const char *path) {
411   // In here only for backwards compatibility. We use MC now.
412 }
413 
414 void lto_codegen_set_assembler_args(lto_code_gen_t cg, const char **args,
415                                     int nargs) {
416   // In here only for backwards compatibility. We use MC now.
417 }
418 
419 void lto_codegen_add_must_preserve_symbol(lto_code_gen_t cg,
420                                           const char *symbol) {
421   unwrap(cg)->addMustPreserveSymbol(symbol);
422 }
423 
424 static void maybeParseOptions(lto_code_gen_t cg) {
425   if (optionParsingState != OptParsingState::Done) {
426     // Parse options if any were set by the lto_codegen_debug_options* function.
427     unwrap(cg)->parseCodeGenDebugOptions();
428     lto_add_attrs(cg);
429     optionParsingState = OptParsingState::Done;
430   }
431 }
432 
433 bool lto_codegen_write_merged_modules(lto_code_gen_t cg, const char *path) {
434   maybeParseOptions(cg);
435   return !unwrap(cg)->writeMergedModules(path);
436 }
437 
438 const void *lto_codegen_compile(lto_code_gen_t cg, size_t *length) {
439   maybeParseOptions(cg);
440   LibLTOCodeGenerator *CG = unwrap(cg);
441   CG->NativeObjectFile = CG->compile();
442   if (!CG->NativeObjectFile)
443     return nullptr;
444   *length = CG->NativeObjectFile->getBufferSize();
445   return CG->NativeObjectFile->getBufferStart();
446 }
447 
448 bool lto_codegen_optimize(lto_code_gen_t cg) {
449   maybeParseOptions(cg);
450   return !unwrap(cg)->optimize();
451 }
452 
453 const void *lto_codegen_compile_optimized(lto_code_gen_t cg, size_t *length) {
454   maybeParseOptions(cg);
455   LibLTOCodeGenerator *CG = unwrap(cg);
456   CG->NativeObjectFile = CG->compileOptimized();
457   if (!CG->NativeObjectFile)
458     return nullptr;
459   *length = CG->NativeObjectFile->getBufferSize();
460   return CG->NativeObjectFile->getBufferStart();
461 }
462 
463 bool lto_codegen_compile_to_file(lto_code_gen_t cg, const char **name) {
464   maybeParseOptions(cg);
465   return !unwrap(cg)->compile_to_file(name);
466 }
467 
468 void lto_set_debug_options(const char *const *options, int number) {
469   assert(optionParsingState == OptParsingState::NotParsed &&
470          "option processing already happened");
471   // Need to put each suboption in a null-terminated string before passing to
472   // parseCommandLineOptions().
473   std::vector<std::string> Options;
474   for (int i = 0; i < number; ++i)
475     Options.push_back(options[i]);
476 
477   llvm::parseCommandLineOptions(Options);
478   optionParsingState = OptParsingState::Early;
479 }
480 
481 void lto_codegen_debug_options(lto_code_gen_t cg, const char *opt) {
482   assert(optionParsingState != OptParsingState::Early &&
483          "early option processing already happened");
484   SmallVector<StringRef, 4> Options;
485   for (std::pair<StringRef, StringRef> o = getToken(opt); !o.first.empty();
486        o = getToken(o.second))
487     Options.push_back(o.first);
488 
489   unwrap(cg)->setCodeGenDebugOptions(Options);
490 }
491 
492 void lto_codegen_debug_options_array(lto_code_gen_t cg,
493                                      const char *const *options, int number) {
494   assert(optionParsingState != OptParsingState::Early &&
495          "early option processing already happened");
496   SmallVector<StringRef, 4> Options;
497   for (int i = 0; i < number; ++i)
498     Options.push_back(options[i]);
499   unwrap(cg)->setCodeGenDebugOptions(ArrayRef(Options));
500 }
501 
502 unsigned int lto_api_version() { return LTO_API_VERSION; }
503 
504 void lto_codegen_set_should_internalize(lto_code_gen_t cg,
505                                         bool ShouldInternalize) {
506   unwrap(cg)->setShouldInternalize(ShouldInternalize);
507 }
508 
509 void lto_codegen_set_should_embed_uselists(lto_code_gen_t cg,
510                                            lto_bool_t ShouldEmbedUselists) {
511   unwrap(cg)->setShouldEmbedUselists(ShouldEmbedUselists);
512 }
513 
514 lto_bool_t lto_module_has_ctor_dtor(lto_module_t mod) {
515   return unwrap(mod)->hasCtorDtor();
516 }
517 
518 // ThinLTO API below
519 
520 thinlto_code_gen_t thinlto_create_codegen(void) {
521   lto_initialize();
522   ThinLTOCodeGenerator *CodeGen = new ThinLTOCodeGenerator();
523   CodeGen->setTargetOptions(
524       codegen::InitTargetOptionsFromCodeGenFlags(Triple()));
525   CodeGen->setFreestanding(EnableFreestanding);
526 
527   if (OptLevel.getNumOccurrences()) {
528     if (OptLevel < '0' || OptLevel > '3')
529       report_fatal_error("Optimization level must be between 0 and 3");
530     CodeGen->setOptLevel(OptLevel - '0');
531     std::optional<CodeGenOpt::Level> CGOptLevelOrNone =
532         CodeGenOpt::getLevel(OptLevel - '0');
533     assert(CGOptLevelOrNone);
534     CodeGen->setCodeGenOptLevel(*CGOptLevelOrNone);
535   }
536   return wrap(CodeGen);
537 }
538 
539 void thinlto_codegen_dispose(thinlto_code_gen_t cg) { delete unwrap(cg); }
540 
541 void thinlto_codegen_add_module(thinlto_code_gen_t cg, const char *Identifier,
542                                 const char *Data, int Length) {
543   unwrap(cg)->addModule(Identifier, StringRef(Data, Length));
544 }
545 
546 void thinlto_codegen_process(thinlto_code_gen_t cg) { unwrap(cg)->run(); }
547 
548 unsigned int thinlto_module_get_num_objects(thinlto_code_gen_t cg) {
549   return unwrap(cg)->getProducedBinaries().size();
550 }
551 LTOObjectBuffer thinlto_module_get_object(thinlto_code_gen_t cg,
552                                           unsigned int index) {
553   assert(index < unwrap(cg)->getProducedBinaries().size() && "Index overflow");
554   auto &MemBuffer = unwrap(cg)->getProducedBinaries()[index];
555   return LTOObjectBuffer{MemBuffer->getBufferStart(),
556                          MemBuffer->getBufferSize()};
557 }
558 
559 unsigned int thinlto_module_get_num_object_files(thinlto_code_gen_t cg) {
560   return unwrap(cg)->getProducedBinaryFiles().size();
561 }
562 const char *thinlto_module_get_object_file(thinlto_code_gen_t cg,
563                                            unsigned int index) {
564   assert(index < unwrap(cg)->getProducedBinaryFiles().size() &&
565          "Index overflow");
566   return unwrap(cg)->getProducedBinaryFiles()[index].c_str();
567 }
568 
569 void thinlto_codegen_disable_codegen(thinlto_code_gen_t cg,
570                                      lto_bool_t disable) {
571   unwrap(cg)->disableCodeGen(disable);
572 }
573 
574 void thinlto_codegen_set_codegen_only(thinlto_code_gen_t cg,
575                                       lto_bool_t CodeGenOnly) {
576   unwrap(cg)->setCodeGenOnly(CodeGenOnly);
577 }
578 
579 void thinlto_debug_options(const char *const *options, int number) {
580   // if options were requested, set them
581   if (number && options) {
582     std::vector<const char *> CodegenArgv(1, "libLTO");
583     append_range(CodegenArgv, ArrayRef<const char *>(options, number));
584     cl::ParseCommandLineOptions(CodegenArgv.size(), CodegenArgv.data());
585   }
586 }
587 
588 lto_bool_t lto_module_is_thinlto(lto_module_t mod) {
589   return unwrap(mod)->isThinLTO();
590 }
591 
592 void thinlto_codegen_add_must_preserve_symbol(thinlto_code_gen_t cg,
593                                               const char *Name, int Length) {
594   unwrap(cg)->preserveSymbol(StringRef(Name, Length));
595 }
596 
597 void thinlto_codegen_add_cross_referenced_symbol(thinlto_code_gen_t cg,
598                                                  const char *Name, int Length) {
599   unwrap(cg)->crossReferenceSymbol(StringRef(Name, Length));
600 }
601 
602 void thinlto_codegen_set_cpu(thinlto_code_gen_t cg, const char *cpu) {
603   return unwrap(cg)->setCpu(cpu);
604 }
605 
606 void thinlto_codegen_set_cache_dir(thinlto_code_gen_t cg,
607                                    const char *cache_dir) {
608   return unwrap(cg)->setCacheDir(cache_dir);
609 }
610 
611 void thinlto_codegen_set_cache_pruning_interval(thinlto_code_gen_t cg,
612                                                 int interval) {
613   return unwrap(cg)->setCachePruningInterval(interval);
614 }
615 
616 void thinlto_codegen_set_cache_entry_expiration(thinlto_code_gen_t cg,
617                                                 unsigned expiration) {
618   return unwrap(cg)->setCacheEntryExpiration(expiration);
619 }
620 
621 void thinlto_codegen_set_final_cache_size_relative_to_available_space(
622     thinlto_code_gen_t cg, unsigned Percentage) {
623   return unwrap(cg)->setMaxCacheSizeRelativeToAvailableSpace(Percentage);
624 }
625 
626 void thinlto_codegen_set_cache_size_bytes(
627     thinlto_code_gen_t cg, unsigned MaxSizeBytes) {
628   return unwrap(cg)->setCacheMaxSizeBytes(MaxSizeBytes);
629 }
630 
631 void thinlto_codegen_set_cache_size_megabytes(
632     thinlto_code_gen_t cg, unsigned MaxSizeMegabytes) {
633   uint64_t MaxSizeBytes = MaxSizeMegabytes;
634   MaxSizeBytes *= 1024 * 1024;
635   return unwrap(cg)->setCacheMaxSizeBytes(MaxSizeBytes);
636 }
637 
638 void thinlto_codegen_set_cache_size_files(
639     thinlto_code_gen_t cg, unsigned MaxSizeFiles) {
640   return unwrap(cg)->setCacheMaxSizeFiles(MaxSizeFiles);
641 }
642 
643 void thinlto_codegen_set_savetemps_dir(thinlto_code_gen_t cg,
644                                        const char *save_temps_dir) {
645   return unwrap(cg)->setSaveTempsDir(save_temps_dir);
646 }
647 
648 void thinlto_set_generated_objects_dir(thinlto_code_gen_t cg,
649                                        const char *save_temps_dir) {
650   unwrap(cg)->setGeneratedObjectsDirectory(save_temps_dir);
651 }
652 
653 lto_bool_t thinlto_codegen_set_pic_model(thinlto_code_gen_t cg,
654                                          lto_codegen_model model) {
655   switch (model) {
656   case LTO_CODEGEN_PIC_MODEL_STATIC:
657     unwrap(cg)->setCodePICModel(Reloc::Static);
658     return false;
659   case LTO_CODEGEN_PIC_MODEL_DYNAMIC:
660     unwrap(cg)->setCodePICModel(Reloc::PIC_);
661     return false;
662   case LTO_CODEGEN_PIC_MODEL_DYNAMIC_NO_PIC:
663     unwrap(cg)->setCodePICModel(Reloc::DynamicNoPIC);
664     return false;
665   case LTO_CODEGEN_PIC_MODEL_DEFAULT:
666     unwrap(cg)->setCodePICModel(std::nullopt);
667     return false;
668   }
669   sLastErrorString = "Unknown PIC model";
670   return true;
671 }
672 
673 DEFINE_SIMPLE_CONVERSION_FUNCTIONS(lto::InputFile, lto_input_t)
674 
675 lto_input_t lto_input_create(const void *buffer, size_t buffer_size, const char *path) {
676   return wrap(LTOModule::createInputFile(buffer, buffer_size, path, sLastErrorString));
677 }
678 
679 void lto_input_dispose(lto_input_t input) {
680   delete unwrap(input);
681 }
682 
683 extern unsigned lto_input_get_num_dependent_libraries(lto_input_t input) {
684   return LTOModule::getDependentLibraryCount(unwrap(input));
685 }
686 
687 extern const char *lto_input_get_dependent_library(lto_input_t input,
688                                                    size_t index,
689                                                    size_t *size) {
690   return LTOModule::getDependentLibrary(unwrap(input), index, size);
691 }
692 
693 extern const char *const *lto_runtime_lib_symbols_list(size_t *size) {
694   auto symbols = lto::LTO::getRuntimeLibcallSymbols();
695   *size = symbols.size();
696   return symbols.data();
697 }
698