1 /*===-- llvm-c/lto.h - LTO Public C Interface ---------------------*- C -*-===*\
3 |* Part of the LLVM Project, under the Apache License v2.0 with LLVM *|
5 |* See https://llvm.org/LICENSE.txt for license information. *|
6 |* SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception *|
8 |*===----------------------------------------------------------------------===*|
10 |* This header provides public interface to an abstract link time optimization*|
11 |* library. LLVM provides an implementation of this interface for use with *|
12 |* llvm bitcode files. *|
14 \*===----------------------------------------------------------------------===*/
19 #include "llvm-c/ExternC.h"
26 #include <sys/types.h>
29 #if !defined(_MSC_VER)
31 typedef bool lto_bool_t;
33 /* MSVC in particular does not have anything like _Bool or bool in C, but we can
34 at least make sure the type is the same size. The implementation side will
36 typedef unsigned char lto_bool_t;
39 typedef bool lto_bool_t;
43 * @defgroup LLVMCLTO LTO
49 #define LTO_API_VERSION 27
52 * \since prior to LTO_API_VERSION=3
55 LTO_SYMBOL_ALIGNMENT_MASK = 0x0000001F, /* log2 of alignment */
56 LTO_SYMBOL_PERMISSIONS_MASK = 0x000000E0,
57 LTO_SYMBOL_PERMISSIONS_CODE = 0x000000A0,
58 LTO_SYMBOL_PERMISSIONS_DATA = 0x000000C0,
59 LTO_SYMBOL_PERMISSIONS_RODATA = 0x00000080,
60 LTO_SYMBOL_DEFINITION_MASK = 0x00000700,
61 LTO_SYMBOL_DEFINITION_REGULAR = 0x00000100,
62 LTO_SYMBOL_DEFINITION_TENTATIVE = 0x00000200,
63 LTO_SYMBOL_DEFINITION_WEAK = 0x00000300,
64 LTO_SYMBOL_DEFINITION_UNDEFINED = 0x00000400,
65 LTO_SYMBOL_DEFINITION_WEAKUNDEF = 0x00000500,
66 LTO_SYMBOL_SCOPE_MASK = 0x00003800,
67 LTO_SYMBOL_SCOPE_INTERNAL = 0x00000800,
68 LTO_SYMBOL_SCOPE_HIDDEN = 0x00001000,
69 LTO_SYMBOL_SCOPE_PROTECTED = 0x00002000,
70 LTO_SYMBOL_SCOPE_DEFAULT = 0x00001800,
71 LTO_SYMBOL_SCOPE_DEFAULT_CAN_BE_HIDDEN = 0x00002800,
72 LTO_SYMBOL_COMDAT = 0x00004000,
73 LTO_SYMBOL_ALIAS = 0x00008000
74 } lto_symbol_attributes;
77 * \since prior to LTO_API_VERSION=3
80 LTO_DEBUG_MODEL_NONE = 0,
81 LTO_DEBUG_MODEL_DWARF = 1
85 * \since prior to LTO_API_VERSION=3
88 LTO_CODEGEN_PIC_MODEL_STATIC = 0,
89 LTO_CODEGEN_PIC_MODEL_DYNAMIC = 1,
90 LTO_CODEGEN_PIC_MODEL_DYNAMIC_NO_PIC = 2,
91 LTO_CODEGEN_PIC_MODEL_DEFAULT = 3
94 /** opaque reference to a loaded object module */
95 typedef struct LLVMOpaqueLTOModule *lto_module_t;
97 /** opaque reference to a code generator */
98 typedef struct LLVMOpaqueLTOCodeGenerator *lto_code_gen_t;
100 /** opaque reference to a thin code generator */
101 typedef struct LLVMOpaqueThinLTOCodeGenerator *thinlto_code_gen_t;
103 LLVM_C_EXTERN_C_BEGIN
106 * Returns a printable string.
108 * \since prior to LTO_API_VERSION=3
111 lto_get_version(void);
114 * Returns the last error string or NULL if last operation was successful.
116 * \since prior to LTO_API_VERSION=3
119 lto_get_error_message(void);
122 * Checks if a file is a loadable object file.
124 * \since prior to LTO_API_VERSION=3
127 lto_module_is_object_file(const char* path);
130 * Checks if a file is a loadable object compiled for requested target.
132 * \since prior to LTO_API_VERSION=3
135 lto_module_is_object_file_for_target(const char* path,
136 const char* target_triple_prefix);
139 * Return true if \p Buffer contains a bitcode file with ObjC code (category
142 * \since LTO_API_VERSION=20
145 lto_module_has_objc_category(const void *mem, size_t length);
148 * Checks if a buffer is a loadable object file.
150 * \since prior to LTO_API_VERSION=3
152 extern lto_bool_t lto_module_is_object_file_in_memory(const void *mem,
156 * Checks if a buffer is a loadable object compiled for requested target.
158 * \since prior to LTO_API_VERSION=3
161 lto_module_is_object_file_in_memory_for_target(const void* mem, size_t length,
162 const char* target_triple_prefix);
165 * Loads an object file from disk.
166 * Returns NULL on error (check lto_get_error_message() for details).
168 * \since prior to LTO_API_VERSION=3
171 lto_module_create(const char* path);
174 * Loads an object file from memory.
175 * Returns NULL on error (check lto_get_error_message() for details).
177 * \since prior to LTO_API_VERSION=3
180 lto_module_create_from_memory(const void* mem, size_t length);
183 * Loads an object file from memory with an extra path argument.
184 * Returns NULL on error (check lto_get_error_message() for details).
186 * \since LTO_API_VERSION=9
189 lto_module_create_from_memory_with_path(const void* mem, size_t length,
193 * Loads an object file in its own context.
195 * Loads an object file in its own LLVMContext. This function call is
196 * thread-safe. However, modules created this way should not be merged into an
197 * lto_code_gen_t using \a lto_codegen_add_module().
199 * Returns NULL on error (check lto_get_error_message() for details).
201 * \since LTO_API_VERSION=11
204 lto_module_create_in_local_context(const void *mem, size_t length,
208 * Loads an object file in the codegen context.
210 * Loads an object file into the same context as \c cg. The module is safe to
211 * add using \a lto_codegen_add_module().
213 * Returns NULL on error (check lto_get_error_message() for details).
215 * \since LTO_API_VERSION=11
218 lto_module_create_in_codegen_context(const void *mem, size_t length,
219 const char *path, lto_code_gen_t cg);
222 * Loads an object file from disk. The seek point of fd is not preserved.
223 * Returns NULL on error (check lto_get_error_message() for details).
225 * \since LTO_API_VERSION=5
228 lto_module_create_from_fd(int fd, const char *path, size_t file_size);
231 * Loads an object file from disk. The seek point of fd is not preserved.
232 * Returns NULL on error (check lto_get_error_message() for details).
234 * \since LTO_API_VERSION=5
237 lto_module_create_from_fd_at_offset(int fd, const char *path, size_t file_size,
238 size_t map_size, off_t offset);
241 * Frees all memory internally allocated by the module.
242 * Upon return the lto_module_t is no longer valid.
244 * \since prior to LTO_API_VERSION=3
247 lto_module_dispose(lto_module_t mod);
250 * Returns triple string which the object module was compiled under.
252 * \since prior to LTO_API_VERSION=3
255 lto_module_get_target_triple(lto_module_t mod);
258 * Sets triple string with which the object will be codegened.
260 * \since LTO_API_VERSION=4
263 lto_module_set_target_triple(lto_module_t mod, const char *triple);
266 * Returns the number of symbols in the object module.
268 * \since prior to LTO_API_VERSION=3
271 lto_module_get_num_symbols(lto_module_t mod);
274 * Returns the name of the ith symbol in the object module.
276 * \since prior to LTO_API_VERSION=3
279 lto_module_get_symbol_name(lto_module_t mod, unsigned int index);
282 * Returns the attributes of the ith symbol in the object module.
284 * \since prior to LTO_API_VERSION=3
286 extern lto_symbol_attributes
287 lto_module_get_symbol_attribute(lto_module_t mod, unsigned int index);
290 * Returns the module's linker options.
292 * The linker options may consist of multiple flags. It is the linker's
293 * responsibility to split the flags using a platform-specific mechanism.
295 * \since LTO_API_VERSION=16
298 lto_module_get_linkeropts(lto_module_t mod);
301 * If targeting mach-o on darwin, this function gets the CPU type and subtype
302 * that will end up being encoded in the mach-o header. These are the values
303 * that can be found in mach/machine.h.
305 * \p out_cputype and \p out_cpusubtype must be non-NULL.
307 * Returns true on error (check lto_get_error_message() for details).
309 * \since LTO_API_VERSION=27
311 extern lto_bool_t lto_module_get_macho_cputype(lto_module_t mod,
312 unsigned int *out_cputype,
313 unsigned int *out_cpusubtype);
316 * Diagnostic severity.
318 * \since LTO_API_VERSION=7
323 LTO_DS_REMARK = 3, // Added in LTO_API_VERSION=10.
325 } lto_codegen_diagnostic_severity_t;
328 * Diagnostic handler type.
329 * \p severity defines the severity.
330 * \p diag is the actual diagnostic.
331 * The diagnostic is not prefixed by any of severity keyword, e.g., 'error: '.
332 * \p ctxt is used to pass the context set with the diagnostic handler.
334 * \since LTO_API_VERSION=7
336 typedef void (*lto_diagnostic_handler_t)(
337 lto_codegen_diagnostic_severity_t severity, const char *diag, void *ctxt);
340 * Set a diagnostic handler and the related context (void *).
341 * This is more general than lto_get_error_message, as the diagnostic handler
342 * can be called at anytime within lto.
344 * \since LTO_API_VERSION=7
346 extern void lto_codegen_set_diagnostic_handler(lto_code_gen_t,
347 lto_diagnostic_handler_t,
351 * Instantiates a code generator.
352 * Returns NULL on error (check lto_get_error_message() for details).
354 * All modules added using \a lto_codegen_add_module() must have been created
355 * in the same context as the codegen.
357 * \since prior to LTO_API_VERSION=3
359 extern lto_code_gen_t
360 lto_codegen_create(void);
363 * Instantiate a code generator in its own context.
365 * Instantiates a code generator in its own context. Modules added via \a
366 * lto_codegen_add_module() must have all been created in the same context,
367 * using \a lto_module_create_in_codegen_context().
369 * \since LTO_API_VERSION=11
371 extern lto_code_gen_t
372 lto_codegen_create_in_local_context(void);
375 * Frees all code generator and all memory it internally allocated.
376 * Upon return the lto_code_gen_t is no longer valid.
378 * \since prior to LTO_API_VERSION=3
381 lto_codegen_dispose(lto_code_gen_t);
384 * Add an object module to the set of modules for which code will be generated.
385 * Returns true on error (check lto_get_error_message() for details).
387 * \c cg and \c mod must both be in the same context. See \a
388 * lto_codegen_create_in_local_context() and \a
389 * lto_module_create_in_codegen_context().
391 * \since prior to LTO_API_VERSION=3
394 lto_codegen_add_module(lto_code_gen_t cg, lto_module_t mod);
397 * Sets the object module for code generation. This will transfer the ownership
398 * of the module to the code generator.
400 * \c cg and \c mod must both be in the same context.
402 * \since LTO_API_VERSION=13
405 lto_codegen_set_module(lto_code_gen_t cg, lto_module_t mod);
408 * Sets if debug info should be generated.
409 * Returns true on error (check lto_get_error_message() for details).
411 * \since prior to LTO_API_VERSION=3
414 lto_codegen_set_debug_model(lto_code_gen_t cg, lto_debug_model);
417 * Sets which PIC code model to generated.
418 * Returns true on error (check lto_get_error_message() for details).
420 * \since prior to LTO_API_VERSION=3
423 lto_codegen_set_pic_model(lto_code_gen_t cg, lto_codegen_model);
426 * Sets the cpu to generate code for.
428 * \since LTO_API_VERSION=4
431 lto_codegen_set_cpu(lto_code_gen_t cg, const char *cpu);
434 * Sets the location of the assembler tool to run. If not set, libLTO
435 * will use gcc to invoke the assembler.
437 * \since LTO_API_VERSION=3
440 lto_codegen_set_assembler_path(lto_code_gen_t cg, const char* path);
443 * Sets extra arguments that libLTO should pass to the assembler.
445 * \since LTO_API_VERSION=4
448 lto_codegen_set_assembler_args(lto_code_gen_t cg, const char **args,
452 * Adds to a list of all global symbols that must exist in the final generated
453 * code. If a function is not listed there, it might be inlined into every usage
454 * and optimized away.
456 * \since prior to LTO_API_VERSION=3
459 lto_codegen_add_must_preserve_symbol(lto_code_gen_t cg, const char* symbol);
462 * Writes a new object file at the specified path that contains the
463 * merged contents of all modules added so far.
464 * Returns true on error (check lto_get_error_message() for details).
466 * \since LTO_API_VERSION=5
469 lto_codegen_write_merged_modules(lto_code_gen_t cg, const char* path);
472 * Generates code for all added modules into one native object file.
473 * This calls lto_codegen_optimize then lto_codegen_compile_optimized.
475 * On success returns a pointer to a generated mach-o/ELF buffer and
476 * length set to the buffer size. The buffer is owned by the
477 * lto_code_gen_t and will be freed when lto_codegen_dispose()
478 * is called, or lto_codegen_compile() is called again.
479 * On failure, returns NULL (check lto_get_error_message() for details).
481 * \since prior to LTO_API_VERSION=3
484 lto_codegen_compile(lto_code_gen_t cg, size_t* length);
487 * Generates code for all added modules into one native object file.
488 * This calls lto_codegen_optimize then lto_codegen_compile_optimized (instead
489 * of returning a generated mach-o/ELF buffer, it writes to a file).
491 * The name of the file is written to name. Returns true on error.
493 * \since LTO_API_VERSION=5
496 lto_codegen_compile_to_file(lto_code_gen_t cg, const char** name);
499 * Runs optimization for the merged module. Returns true on error.
501 * \since LTO_API_VERSION=12
504 lto_codegen_optimize(lto_code_gen_t cg);
507 * Generates code for the optimized merged module into one native object file.
508 * It will not run any IR optimizations on the merged module.
510 * On success returns a pointer to a generated mach-o/ELF buffer and length set
511 * to the buffer size. The buffer is owned by the lto_code_gen_t and will be
512 * freed when lto_codegen_dispose() is called, or
513 * lto_codegen_compile_optimized() is called again. On failure, returns NULL
514 * (check lto_get_error_message() for details).
516 * \since LTO_API_VERSION=12
519 lto_codegen_compile_optimized(lto_code_gen_t cg, size_t* length);
522 * Returns the runtime API version.
524 * \since LTO_API_VERSION=12
527 lto_api_version(void);
530 * Sets options to help debug codegen bugs.
532 * This function takes one or more options separated by spaces.
533 * Warning: passing file paths through this function may confuse the argument
534 * parser if the paths contain spaces.
536 * \since prior to LTO_API_VERSION=3
539 lto_codegen_debug_options(lto_code_gen_t cg, const char *);
542 * Same as the previous function, but takes every option separately through an
545 * \since prior to LTO_API_VERSION=26
547 extern void lto_codegen_debug_options_array(lto_code_gen_t cg,
548 const char *const *, int number);
551 * Initializes LLVM disassemblers.
552 * FIXME: This doesn't really belong here.
554 * \since LTO_API_VERSION=5
557 lto_initialize_disassembler(void);
560 * Sets if we should run internalize pass during optimization and code
563 * \since LTO_API_VERSION=14
566 lto_codegen_set_should_internalize(lto_code_gen_t cg,
567 lto_bool_t ShouldInternalize);
570 * Set whether to embed uselists in bitcode.
572 * Sets whether \a lto_codegen_write_merged_modules() should embed uselists in
573 * output bitcode. This should be turned on for all -save-temps output.
575 * \since LTO_API_VERSION=15
578 lto_codegen_set_should_embed_uselists(lto_code_gen_t cg,
579 lto_bool_t ShouldEmbedUselists);
581 /** Opaque reference to an LTO input file */
582 typedef struct LLVMOpaqueLTOInput *lto_input_t;
585 * Creates an LTO input file from a buffer. The path
586 * argument is used for diagnotics as this function
587 * otherwise does not know which file the given buffer
588 * is associated with.
590 * \since LTO_API_VERSION=24
592 extern lto_input_t lto_input_create(const void *buffer,
597 * Frees all memory internally allocated by the LTO input file.
598 * Upon return the lto_module_t is no longer valid.
600 * \since LTO_API_VERSION=24
602 extern void lto_input_dispose(lto_input_t input);
605 * Returns the number of dependent library specifiers
606 * for the given LTO input file.
608 * \since LTO_API_VERSION=24
610 extern unsigned lto_input_get_num_dependent_libraries(lto_input_t input);
613 * Returns the ith dependent library specifier
614 * for the given LTO input file. The returned
615 * string is not null-terminated.
617 * \since LTO_API_VERSION=24
619 extern const char * lto_input_get_dependent_library(lto_input_t input,
624 * Returns the list of libcall symbols that can be generated by LTO
625 * that might not be visible from the symbol table of bitcode files.
627 * \since prior to LTO_API_VERSION=25
629 extern const char *const *lto_runtime_lib_symbols_list(size_t *size);
632 * @} // endgoup LLVMCLTO
633 * @defgroup LLVMCTLTO ThinLTO
640 * Type to wrap a single object returned by ThinLTO.
642 * \since LTO_API_VERSION=18
650 * Instantiates a ThinLTO code generator.
651 * Returns NULL on error (check lto_get_error_message() for details).
654 * The ThinLTOCodeGenerator is not intended to be reuse for multiple
655 * compilation: the model is that the client adds modules to the generator and
656 * ask to perform the ThinLTO optimizations / codegen, and finally destroys the
659 * \since LTO_API_VERSION=18
661 extern thinlto_code_gen_t thinlto_create_codegen(void);
664 * Frees the generator and all memory it internally allocated.
665 * Upon return the thinlto_code_gen_t is no longer valid.
667 * \since LTO_API_VERSION=18
669 extern void thinlto_codegen_dispose(thinlto_code_gen_t cg);
672 * Add a module to a ThinLTO code generator. Identifier has to be unique among
673 * all the modules in a code generator. The data buffer stays owned by the
674 * client, and is expected to be available for the entire lifetime of the
675 * thinlto_code_gen_t it is added to.
677 * On failure, returns NULL (check lto_get_error_message() for details).
680 * \since LTO_API_VERSION=18
682 extern void thinlto_codegen_add_module(thinlto_code_gen_t cg,
683 const char *identifier, const char *data,
687 * Optimize and codegen all the modules added to the codegenerator using
688 * ThinLTO. Resulting objects are accessible using thinlto_module_get_object().
690 * \since LTO_API_VERSION=18
692 extern void thinlto_codegen_process(thinlto_code_gen_t cg);
695 * Returns the number of object files produced by the ThinLTO CodeGenerator.
697 * It usually matches the number of input files, but this is not a guarantee of
698 * the API and may change in future implementation, so the client should not
701 * \since LTO_API_VERSION=18
703 extern unsigned int thinlto_module_get_num_objects(thinlto_code_gen_t cg);
706 * Returns a reference to the ith object file produced by the ThinLTO
709 * Client should use \p thinlto_module_get_num_objects() to get the number of
712 * \since LTO_API_VERSION=18
714 extern LTOObjectBuffer thinlto_module_get_object(thinlto_code_gen_t cg,
718 * Returns the number of object files produced by the ThinLTO CodeGenerator.
720 * It usually matches the number of input files, but this is not a guarantee of
721 * the API and may change in future implementation, so the client should not
724 * \since LTO_API_VERSION=21
726 unsigned int thinlto_module_get_num_object_files(thinlto_code_gen_t cg);
729 * Returns the path to the ith object file produced by the ThinLTO
732 * Client should use \p thinlto_module_get_num_object_files() to get the number
733 * of available objects.
735 * \since LTO_API_VERSION=21
737 const char *thinlto_module_get_object_file(thinlto_code_gen_t cg,
741 * Sets which PIC code model to generate.
742 * Returns true on error (check lto_get_error_message() for details).
744 * \since LTO_API_VERSION=18
746 extern lto_bool_t thinlto_codegen_set_pic_model(thinlto_code_gen_t cg,
750 * Sets the path to a directory to use as a storage for temporary bitcode files.
751 * The intention is to make the bitcode files available for debugging at various
752 * stage of the pipeline.
754 * \since LTO_API_VERSION=18
756 extern void thinlto_codegen_set_savetemps_dir(thinlto_code_gen_t cg,
757 const char *save_temps_dir);
760 * Set the path to a directory where to save generated object files. This
761 * path can be used by a linker to request on-disk files instead of in-memory
762 * buffers. When set, results are available through
763 * thinlto_module_get_object_file() instead of thinlto_module_get_object().
765 * \since LTO_API_VERSION=21
767 void thinlto_set_generated_objects_dir(thinlto_code_gen_t cg,
768 const char *save_temps_dir);
771 * Sets the cpu to generate code for.
773 * \since LTO_API_VERSION=18
775 extern void thinlto_codegen_set_cpu(thinlto_code_gen_t cg, const char *cpu);
778 * Disable CodeGen, only run the stages till codegen and stop. The output will
781 * \since LTO_API_VERSION=19
783 extern void thinlto_codegen_disable_codegen(thinlto_code_gen_t cg,
787 * Perform CodeGen only: disable all other stages.
789 * \since LTO_API_VERSION=19
791 extern void thinlto_codegen_set_codegen_only(thinlto_code_gen_t cg,
792 lto_bool_t codegen_only);
795 * Parse -mllvm style debug options.
797 * \since LTO_API_VERSION=18
799 extern void thinlto_debug_options(const char *const *options, int number);
802 * Test if a module has support for ThinLTO linking.
804 * \since LTO_API_VERSION=18
806 extern lto_bool_t lto_module_is_thinlto(lto_module_t mod);
809 * Adds a symbol to the list of global symbols that must exist in the final
810 * generated code. If a function is not listed there, it might be inlined into
811 * every usage and optimized away. For every single module, the functions
812 * referenced from code outside of the ThinLTO modules need to be added here.
814 * \since LTO_API_VERSION=18
816 extern void thinlto_codegen_add_must_preserve_symbol(thinlto_code_gen_t cg,
821 * Adds a symbol to the list of global symbols that are cross-referenced between
822 * ThinLTO files. If the ThinLTO CodeGenerator can ensure that every
823 * references from a ThinLTO module to this symbol is optimized away, then
824 * the symbol can be discarded.
826 * \since LTO_API_VERSION=18
828 extern void thinlto_codegen_add_cross_referenced_symbol(thinlto_code_gen_t cg,
833 * @} // endgoup LLVMCTLTO
834 * @defgroup LLVMCTLTO_CACHING ThinLTO Cache Control
837 * These entry points control the ThinLTO cache. The cache is intended to
838 * support incremental builds, and thus needs to be persistent across builds.
839 * The client enables the cache by supplying a path to an existing directory.
840 * The code generator will use this to store objects files that may be reused
841 * during a subsequent build.
842 * To avoid filling the disk space, a few knobs are provided:
843 * - The pruning interval limits the frequency at which the garbage collector
844 * will try to scan the cache directory to prune expired entries.
845 * Setting to a negative number disables the pruning.
846 * - The pruning expiration time indicates to the garbage collector how old an
847 * entry needs to be to be removed.
848 * - Finally, the garbage collector can be instructed to prune the cache until
849 * the occupied space goes below a threshold.
854 * Sets the path to a directory to use as a cache storage for incremental build.
855 * Setting this activates caching.
857 * \since LTO_API_VERSION=18
859 extern void thinlto_codegen_set_cache_dir(thinlto_code_gen_t cg,
860 const char *cache_dir);
863 * Sets the cache pruning interval (in seconds). A negative value disables the
864 * pruning. An unspecified default value will be applied, and a value of 0 will
865 * force prunning to occur.
867 * \since LTO_API_VERSION=18
869 extern void thinlto_codegen_set_cache_pruning_interval(thinlto_code_gen_t cg,
873 * Sets the maximum cache size that can be persistent across build, in terms of
874 * percentage of the available space on the disk. Set to 100 to indicate
875 * no limit, 50 to indicate that the cache size will not be left over half the
876 * available space. A value over 100 will be reduced to 100, a value of 0 will
877 * be ignored. An unspecified default value will be applied.
879 * The formula looks like:
880 * AvailableSpace = FreeSpace + ExistingCacheSize
881 * NewCacheSize = AvailableSpace * P/100
883 * \since LTO_API_VERSION=18
885 extern void thinlto_codegen_set_final_cache_size_relative_to_available_space(
886 thinlto_code_gen_t cg, unsigned percentage);
889 * Sets the expiration (in seconds) for an entry in the cache. An unspecified
890 * default value will be applied. A value of 0 will be ignored.
892 * \since LTO_API_VERSION=18
894 extern void thinlto_codegen_set_cache_entry_expiration(thinlto_code_gen_t cg,
895 unsigned expiration);
898 * Sets the maximum size of the cache directory (in bytes). A value over the
899 * amount of available space on the disk will be reduced to the amount of
900 * available space. An unspecified default value will be applied. A value of 0
903 * \since LTO_API_VERSION=22
905 extern void thinlto_codegen_set_cache_size_bytes(thinlto_code_gen_t cg,
906 unsigned max_size_bytes);
909 * Same as thinlto_codegen_set_cache_size_bytes, except the maximum size is in
910 * megabytes (2^20 bytes).
912 * \since LTO_API_VERSION=23
915 thinlto_codegen_set_cache_size_megabytes(thinlto_code_gen_t cg,
916 unsigned max_size_megabytes);
919 * Sets the maximum number of files in the cache directory. An unspecified
920 * default value will be applied. A value of 0 will be ignored.
922 * \since LTO_API_VERSION=22
924 extern void thinlto_codegen_set_cache_size_files(thinlto_code_gen_t cg,
925 unsigned max_size_files);
928 * @} // endgroup LLVMCTLTO_CACHING
933 #endif /* LLVM_C_LTO_H */