1 /*===-- llvm-c/lto.h - LTO Public C Interface ---------------------*- C -*-===*\
3 |* The LLVM Compiler Infrastructure *|
5 |* This file is distributed under the University of Illinois Open Source *|
6 |* License. See LICENSE.TXT for details. *|
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 \*===----------------------------------------------------------------------===*/
20 #include <sys/types.h>
23 * @defgroup LLVMCLTO LTO
29 #define LTO_API_VERSION 5
32 LTO_SYMBOL_ALIGNMENT_MASK = 0x0000001F, /* log2 of alignment */
33 LTO_SYMBOL_PERMISSIONS_MASK = 0x000000E0,
34 LTO_SYMBOL_PERMISSIONS_CODE = 0x000000A0,
35 LTO_SYMBOL_PERMISSIONS_DATA = 0x000000C0,
36 LTO_SYMBOL_PERMISSIONS_RODATA = 0x00000080,
37 LTO_SYMBOL_DEFINITION_MASK = 0x00000700,
38 LTO_SYMBOL_DEFINITION_REGULAR = 0x00000100,
39 LTO_SYMBOL_DEFINITION_TENTATIVE = 0x00000200,
40 LTO_SYMBOL_DEFINITION_WEAK = 0x00000300,
41 LTO_SYMBOL_DEFINITION_UNDEFINED = 0x00000400,
42 LTO_SYMBOL_DEFINITION_WEAKUNDEF = 0x00000500,
43 LTO_SYMBOL_SCOPE_MASK = 0x00003800,
44 LTO_SYMBOL_SCOPE_INTERNAL = 0x00000800,
45 LTO_SYMBOL_SCOPE_HIDDEN = 0x00001000,
46 LTO_SYMBOL_SCOPE_PROTECTED = 0x00002000,
47 LTO_SYMBOL_SCOPE_DEFAULT = 0x00001800,
48 LTO_SYMBOL_SCOPE_DEFAULT_CAN_BE_HIDDEN = 0x00002800
49 } lto_symbol_attributes;
52 LTO_DEBUG_MODEL_NONE = 0,
53 LTO_DEBUG_MODEL_DWARF = 1
57 LTO_CODEGEN_PIC_MODEL_STATIC = 0,
58 LTO_CODEGEN_PIC_MODEL_DYNAMIC = 1,
59 LTO_CODEGEN_PIC_MODEL_DYNAMIC_NO_PIC = 2
63 /** opaque reference to a loaded object module */
64 typedef struct LTOModule* lto_module_t;
66 /** opaque reference to a code generator */
67 typedef struct LTOCodeGenerator* lto_code_gen_t;
74 * Returns a printable string.
77 lto_get_version(void);
81 * Returns the last error string or NULL if last operation was successful.
84 lto_get_error_message(void);
87 * Checks if a file is a loadable object file.
90 lto_module_is_object_file(const char* path);
94 * Checks if a file is a loadable object compiled for requested target.
97 lto_module_is_object_file_for_target(const char* path,
98 const char* target_triple_prefix);
102 * Checks if a buffer is a loadable object file.
105 lto_module_is_object_file_in_memory(const void* mem, size_t length);
109 * Checks if a buffer is a loadable object compiled for requested target.
112 lto_module_is_object_file_in_memory_for_target(const void* mem, size_t length,
113 const char* target_triple_prefix);
117 * Loads an object file from disk.
118 * Returns NULL on error (check lto_get_error_message() for details).
121 lto_module_create(const char* path);
125 * Loads an object file from memory.
126 * Returns NULL on error (check lto_get_error_message() for details).
129 lto_module_create_from_memory(const void* mem, size_t length);
132 * Loads an object file from disk. The seek point of fd is not preserved.
133 * Returns NULL on error (check lto_get_error_message() for details).
136 lto_module_create_from_fd(int fd, const char *path, size_t file_size);
139 * Loads an object file from disk. The seek point of fd is not preserved.
140 * Returns NULL on error (check lto_get_error_message() for details).
143 lto_module_create_from_fd_at_offset(int fd, const char *path, size_t file_size,
144 size_t map_size, off_t offset);
148 * Frees all memory internally allocated by the module.
149 * Upon return the lto_module_t is no longer valid.
152 lto_module_dispose(lto_module_t mod);
156 * Returns triple string which the object module was compiled under.
159 lto_module_get_target_triple(lto_module_t mod);
162 * Sets triple string with which the object will be codegened.
165 lto_module_set_target_triple(lto_module_t mod, const char *triple);
169 * Returns the number of symbols in the object module.
172 lto_module_get_num_symbols(lto_module_t mod);
176 * Returns the name of the ith symbol in the object module.
179 lto_module_get_symbol_name(lto_module_t mod, unsigned int index);
183 * Returns the attributes of the ith symbol in the object module.
185 extern lto_symbol_attributes
186 lto_module_get_symbol_attribute(lto_module_t mod, unsigned int index);
190 * Instantiates a code generator.
191 * Returns NULL on error (check lto_get_error_message() for details).
193 extern lto_code_gen_t
194 lto_codegen_create(void);
198 * Frees all code generator and all memory it internally allocated.
199 * Upon return the lto_code_gen_t is no longer valid.
202 lto_codegen_dispose(lto_code_gen_t);
207 * Add an object module to the set of modules for which code will be generated.
208 * Returns true on error (check lto_get_error_message() for details).
211 lto_codegen_add_module(lto_code_gen_t cg, lto_module_t mod);
216 * Sets if debug info should be generated.
217 * Returns true on error (check lto_get_error_message() for details).
220 lto_codegen_set_debug_model(lto_code_gen_t cg, lto_debug_model);
224 * Sets which PIC code model to generated.
225 * Returns true on error (check lto_get_error_message() for details).
228 lto_codegen_set_pic_model(lto_code_gen_t cg, lto_codegen_model);
232 * Sets the cpu to generate code for.
235 lto_codegen_set_cpu(lto_code_gen_t cg, const char *cpu);
239 * Sets the location of the assembler tool to run. If not set, libLTO
240 * will use gcc to invoke the assembler.
243 lto_codegen_set_assembler_path(lto_code_gen_t cg, const char* path);
246 * Sets extra arguments that libLTO should pass to the assembler.
249 lto_codegen_set_assembler_args(lto_code_gen_t cg, const char **args,
253 * Tells LTO optimization passes that this symbol must be preserved
254 * because it is referenced by native code or a command line option.
257 lto_codegen_add_must_preserve_symbol(lto_code_gen_t cg, const char* symbol);
261 * Tells LTO optimization passes that a dynamic shared library is being
262 * built and this symbol may be exported. Unless IR semantics allow the symbol
263 * to be made local to the library, it should remain so it can be exported by
264 * the shared library.
266 extern void lto_codegen_add_dso_symbol(lto_code_gen_t cg, const char *symbol);
269 * Writes a new object file at the specified path that contains the
270 * merged contents of all modules added so far.
271 * Returns true on error (check lto_get_error_message() for details).
274 lto_codegen_write_merged_modules(lto_code_gen_t cg, const char* path);
277 * Generates code for all added modules into one native object file.
278 * On success returns a pointer to a generated mach-o/ELF buffer and
279 * length set to the buffer size. The buffer is owned by the
280 * lto_code_gen_t and will be freed when lto_codegen_dispose()
281 * is called, or lto_codegen_compile() is called again.
282 * On failure, returns NULL (check lto_get_error_message() for details).
285 lto_codegen_compile(lto_code_gen_t cg, size_t* length);
288 * Generates code for all added modules into one native object file.
289 * The name of the file is written to name. Returns true on error.
292 lto_codegen_compile_to_file(lto_code_gen_t cg, const char** name);
296 * Sets options to help debug codegen bugs.
299 lto_codegen_debug_options(lto_code_gen_t cg, const char *);
302 * Initializes LLVM disassemblers.
303 * FIXME: This doesn't really belong here.
306 lto_initialize_disassembler(void);