LLVM  3.7.0
lto.h
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1 /*===-- llvm-c/lto.h - LTO Public C Interface ---------------------*- C -*-===*\
2 |* *|
3 |* The LLVM Compiler Infrastructure *|
4 |* *|
5 |* This file is distributed under the University of Illinois Open Source *|
6 |* License. See LICENSE.TXT for details. *|
7 |* *|
8 |*===----------------------------------------------------------------------===*|
9 |* *|
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. *|
13 |* *|
14 \*===----------------------------------------------------------------------===*/
15 
16 #ifndef LLVM_C_LTO_H
17 #define LLVM_C_LTO_H
18 
19 #include <stddef.h>
20 #include <sys/types.h>
21 
22 #ifndef __cplusplus
23 #if !defined(_MSC_VER)
24 #include <stdbool.h>
25 typedef bool lto_bool_t;
26 #else
27 /* MSVC in particular does not have anything like _Bool or bool in C, but we can
28  at least make sure the type is the same size. The implementation side will
29  use C++ bool. */
30 typedef unsigned char lto_bool_t;
31 #endif
32 #else
33 typedef bool lto_bool_t;
34 #endif
35 
36 /**
37  * @defgroup LLVMCLTO LTO
38  * @ingroup LLVMC
39  *
40  * @{
41  */
42 
43 #define LTO_API_VERSION 17
44 
45 /**
46  * \since prior to LTO_API_VERSION=3
47  */
48 typedef enum {
49  LTO_SYMBOL_ALIGNMENT_MASK = 0x0000001F, /* log2 of alignment */
60  LTO_SYMBOL_SCOPE_MASK = 0x00003800,
66  LTO_SYMBOL_COMDAT = 0x00004000,
67  LTO_SYMBOL_ALIAS = 0x00008000
69 
70 /**
71  * \since prior to LTO_API_VERSION=3
72  */
73 typedef enum {
77 
78 /**
79  * \since prior to LTO_API_VERSION=3
80  */
81 typedef enum {
87 
88 /** opaque reference to a loaded object module */
89 typedef struct LLVMOpaqueLTOModule *lto_module_t;
90 
91 /** opaque reference to a code generator */
92 typedef struct LLVMOpaqueLTOCodeGenerator *lto_code_gen_t;
93 
94 #ifdef __cplusplus
95 extern "C" {
96 #endif
97 
98 /**
99  * Returns a printable string.
100  *
101  * \since prior to LTO_API_VERSION=3
102  */
103 extern const char*
104 lto_get_version(void);
105 
106 
107 /**
108  * Returns the last error string or NULL if last operation was successful.
109  *
110  * \since prior to LTO_API_VERSION=3
111  */
112 extern const char*
114 
115 /**
116  * Checks if a file is a loadable object file.
117  *
118  * \since prior to LTO_API_VERSION=3
119  */
120 extern lto_bool_t
121 lto_module_is_object_file(const char* path);
122 
123 
124 /**
125  * Checks if a file is a loadable object compiled for requested target.
126  *
127  * \since prior to LTO_API_VERSION=3
128  */
129 extern lto_bool_t
130 lto_module_is_object_file_for_target(const char* path,
131  const char* target_triple_prefix);
132 
133 
134 /**
135  * Checks if a buffer is a loadable object file.
136  *
137  * \since prior to LTO_API_VERSION=3
138  */
139 extern lto_bool_t
140 lto_module_is_object_file_in_memory(const void* mem, size_t length);
141 
142 
143 /**
144  * Checks if a buffer is a loadable object compiled for requested target.
145  *
146  * \since prior to LTO_API_VERSION=3
147  */
148 extern lto_bool_t
149 lto_module_is_object_file_in_memory_for_target(const void* mem, size_t length,
150  const char* target_triple_prefix);
151 
152 
153 /**
154  * Loads an object file from disk.
155  * Returns NULL on error (check lto_get_error_message() for details).
156  *
157  * \since prior to LTO_API_VERSION=3
158  */
159 extern lto_module_t
160 lto_module_create(const char* path);
161 
162 
163 /**
164  * Loads an object file from memory.
165  * Returns NULL on error (check lto_get_error_message() for details).
166  *
167  * \since prior to LTO_API_VERSION=3
168  */
169 extern lto_module_t
170 lto_module_create_from_memory(const void* mem, size_t length);
171 
172 /**
173  * Loads an object file from memory with an extra path argument.
174  * Returns NULL on error (check lto_get_error_message() for details).
175  *
176  * \since LTO_API_VERSION=9
177  */
178 extern lto_module_t
179 lto_module_create_from_memory_with_path(const void* mem, size_t length,
180  const char *path);
181 
182 /**
183  * \brief Loads an object file in its own context.
184  *
185  * Loads an object file in its own LLVMContext. This function call is
186  * thread-safe. However, modules created this way should not be merged into an
187  * lto_code_gen_t using \a lto_codegen_add_module().
188  *
189  * Returns NULL on error (check lto_get_error_message() for details).
190  *
191  * \since LTO_API_VERSION=11
192  */
193 extern lto_module_t
194 lto_module_create_in_local_context(const void *mem, size_t length,
195  const char *path);
196 
197 /**
198  * \brief Loads an object file in the codegen context.
199  *
200  * Loads an object file into the same context as \c cg. The module is safe to
201  * add using \a lto_codegen_add_module().
202  *
203  * Returns NULL on error (check lto_get_error_message() for details).
204  *
205  * \since LTO_API_VERSION=11
206  */
207 extern lto_module_t
208 lto_module_create_in_codegen_context(const void *mem, size_t length,
209  const char *path, lto_code_gen_t cg);
210 
211 /**
212  * Loads an object file from disk. The seek point of fd is not preserved.
213  * Returns NULL on error (check lto_get_error_message() for details).
214  *
215  * \since LTO_API_VERSION=5
216  */
217 extern lto_module_t
218 lto_module_create_from_fd(int fd, const char *path, size_t file_size);
219 
220 /**
221  * Loads an object file from disk. The seek point of fd is not preserved.
222  * Returns NULL on error (check lto_get_error_message() for details).
223  *
224  * \since LTO_API_VERSION=5
225  */
226 extern lto_module_t
227 lto_module_create_from_fd_at_offset(int fd, const char *path, size_t file_size,
228  size_t map_size, off_t offset);
229 
230 /**
231  * Frees all memory internally allocated by the module.
232  * Upon return the lto_module_t is no longer valid.
233  *
234  * \since prior to LTO_API_VERSION=3
235  */
236 extern void
238 
239 /**
240  * Returns triple string which the object module was compiled under.
241  *
242  * \since prior to LTO_API_VERSION=3
243  */
244 extern const char*
246 
247 /**
248  * Sets triple string with which the object will be codegened.
249  *
250  * \since LTO_API_VERSION=4
251  */
252 extern void
253 lto_module_set_target_triple(lto_module_t mod, const char *triple);
254 
255 
256 /**
257  * Returns the number of symbols in the object module.
258  *
259  * \since prior to LTO_API_VERSION=3
260  */
261 extern unsigned int
263 
264 
265 /**
266  * Returns the name of the ith symbol in the object module.
267  *
268  * \since prior to LTO_API_VERSION=3
269  */
270 extern const char*
271 lto_module_get_symbol_name(lto_module_t mod, unsigned int index);
272 
273 
274 /**
275  * Returns the attributes of the ith symbol in the object module.
276  *
277  * \since prior to LTO_API_VERSION=3
278  */
280 lto_module_get_symbol_attribute(lto_module_t mod, unsigned int index);
281 
282 
283 /**
284  * Returns the module's linker options.
285  *
286  * The linker options may consist of multiple flags. It is the linker's
287  * responsibility to split the flags using a platform-specific mechanism.
288  *
289  * \since LTO_API_VERSION=16
290  */
291 extern const char*
293 
294 
295 /**
296  * Diagnostic severity.
297  *
298  * \since LTO_API_VERSION=7
299  */
300 typedef enum {
303  LTO_DS_REMARK = 3, // Added in LTO_API_VERSION=10.
306 
307 /**
308  * Diagnostic handler type.
309  * \p severity defines the severity.
310  * \p diag is the actual diagnostic.
311  * The diagnostic is not prefixed by any of severity keyword, e.g., 'error: '.
312  * \p ctxt is used to pass the context set with the diagnostic handler.
313  *
314  * \since LTO_API_VERSION=7
315  */
316 typedef void (*lto_diagnostic_handler_t)(
317  lto_codegen_diagnostic_severity_t severity, const char *diag, void *ctxt);
318 
319 /**
320  * Set a diagnostic handler and the related context (void *).
321  * This is more general than lto_get_error_message, as the diagnostic handler
322  * can be called at anytime within lto.
323  *
324  * \since LTO_API_VERSION=7
325  */
328  void *);
329 
330 /**
331  * Instantiates a code generator.
332  * Returns NULL on error (check lto_get_error_message() for details).
333  *
334  * All modules added using \a lto_codegen_add_module() must have been created
335  * in the same context as the codegen.
336  *
337  * \since prior to LTO_API_VERSION=3
338  */
339 extern lto_code_gen_t
340 lto_codegen_create(void);
341 
342 /**
343  * \brief Instantiate a code generator in its own context.
344  *
345  * Instantiates a code generator in its own context. Modules added via \a
346  * lto_codegen_add_module() must have all been created in the same context,
347  * using \a lto_module_create_in_codegen_context().
348  *
349  * \since LTO_API_VERSION=11
350  */
351 extern lto_code_gen_t
353 
354 /**
355  * Frees all code generator and all memory it internally allocated.
356  * Upon return the lto_code_gen_t is no longer valid.
357  *
358  * \since prior to LTO_API_VERSION=3
359  */
360 extern void
362 
363 /**
364  * Add an object module to the set of modules for which code will be generated.
365  * Returns true on error (check lto_get_error_message() for details).
366  *
367  * \c cg and \c mod must both be in the same context. See \a
368  * lto_codegen_create_in_local_context() and \a
369  * lto_module_create_in_codegen_context().
370  *
371  * \since prior to LTO_API_VERSION=3
372  */
373 extern lto_bool_t
375 
376 /**
377  * Sets the object module for code generation. This will transfer the ownship of
378  * the module to code generator.
379  *
380  * \c cg and \c mod must both be in the same context.
381  *
382  * \since LTO_API_VERSION=13
383  */
384 extern void
386 
387 /**
388  * Sets if debug info should be generated.
389  * Returns true on error (check lto_get_error_message() for details).
390  *
391  * \since prior to LTO_API_VERSION=3
392  */
393 extern lto_bool_t
395 
396 
397 /**
398  * Sets which PIC code model to generated.
399  * Returns true on error (check lto_get_error_message() for details).
400  *
401  * \since prior to LTO_API_VERSION=3
402  */
403 extern lto_bool_t
405 
406 
407 /**
408  * Sets the cpu to generate code for.
409  *
410  * \since LTO_API_VERSION=4
411  */
412 extern void
413 lto_codegen_set_cpu(lto_code_gen_t cg, const char *cpu);
414 
415 
416 /**
417  * Sets the location of the assembler tool to run. If not set, libLTO
418  * will use gcc to invoke the assembler.
419  *
420  * \since LTO_API_VERSION=3
421  */
422 extern void
423 lto_codegen_set_assembler_path(lto_code_gen_t cg, const char* path);
424 
425 /**
426  * Sets extra arguments that libLTO should pass to the assembler.
427  *
428  * \since LTO_API_VERSION=4
429  */
430 extern void
431 lto_codegen_set_assembler_args(lto_code_gen_t cg, const char **args,
432  int nargs);
433 
434 /**
435  * Adds to a list of all global symbols that must exist in the final generated
436  * code. If a function is not listed there, it might be inlined into every usage
437  * and optimized away.
438  *
439  * \since prior to LTO_API_VERSION=3
440  */
441 extern void
443 
444 /**
445  * Writes a new object file at the specified path that contains the
446  * merged contents of all modules added so far.
447  * Returns true on error (check lto_get_error_message() for details).
448  *
449  * \since LTO_API_VERSION=5
450  */
451 extern lto_bool_t
453 
454 /**
455  * Generates code for all added modules into one native object file.
456  * This calls lto_codegen_optimize then lto_codegen_compile_optimized.
457  *
458  * On success returns a pointer to a generated mach-o/ELF buffer and
459  * length set to the buffer size. The buffer is owned by the
460  * lto_code_gen_t and will be freed when lto_codegen_dispose()
461  * is called, or lto_codegen_compile() is called again.
462  * On failure, returns NULL (check lto_get_error_message() for details).
463  *
464  * \since prior to LTO_API_VERSION=3
465  */
466 extern const void*
467 lto_codegen_compile(lto_code_gen_t cg, size_t* length);
468 
469 /**
470  * Generates code for all added modules into one native object file.
471  * This calls lto_codegen_optimize then lto_codegen_compile_optimized (instead
472  * of returning a generated mach-o/ELF buffer, it writes to a file).
473  *
474  * The name of the file is written to name. Returns true on error.
475  *
476  * \since LTO_API_VERSION=5
477  */
478 extern lto_bool_t
480 
481 /**
482  * Runs optimization for the merged module. Returns true on error.
483  *
484  * \since LTO_API_VERSION=12
485  */
486 extern lto_bool_t
488 
489 /**
490  * Generates code for the optimized merged module into one native object file.
491  * It will not run any IR optimizations on the merged module.
492  *
493  * On success returns a pointer to a generated mach-o/ELF buffer and length set
494  * to the buffer size. The buffer is owned by the lto_code_gen_t and will be
495  * freed when lto_codegen_dispose() is called, or
496  * lto_codegen_compile_optimized() is called again. On failure, returns NULL
497  * (check lto_get_error_message() for details).
498  *
499  * \since LTO_API_VERSION=12
500  */
501 extern const void*
503 
504 /**
505  * Returns the runtime API version.
506  *
507  * \since LTO_API_VERSION=12
508  */
509 extern unsigned int
510 lto_api_version(void);
511 
512 /**
513  * Sets options to help debug codegen bugs.
514  *
515  * \since prior to LTO_API_VERSION=3
516  */
517 extern void
518 lto_codegen_debug_options(lto_code_gen_t cg, const char *);
519 
520 /**
521  * Initializes LLVM disassemblers.
522  * FIXME: This doesn't really belong here.
523  *
524  * \since LTO_API_VERSION=5
525  */
526 extern void
528 
529 /**
530  * Sets if we should run internalize pass during optimization and code
531  * generation.
532  *
533  * \since LTO_API_VERSION=14
534  */
535 extern void
537  lto_bool_t ShouldInternalize);
538 
539 /**
540  * \brief Set whether to embed uselists in bitcode.
541  *
542  * Sets whether \a lto_codegen_write_merged_modules() should embed uselists in
543  * output bitcode. This should be turned on for all -save-temps output.
544  *
545  * \since LTO_API_VERSION=15
546  */
547 extern void
549  lto_bool_t ShouldEmbedUselists);
550 
551 #ifdef __cplusplus
552 }
553 #endif
554 
555 /**
556  * @}
557  */
558 
559 #endif
void lto_codegen_set_diagnostic_handler(lto_code_gen_t, lto_diagnostic_handler_t, void *)
Set a diagnostic handler and the related context (void *).
lto_module_t lto_module_create_in_local_context(const void *mem, size_t length, const char *path)
Loads an object file in its own context.
lto_code_gen_t lto_codegen_create(void)
Instantiates a code generator.
lto_bool_t lto_module_is_object_file_in_memory(const void *mem, size_t length)
Checks if a buffer is a loadable object file.
struct LLVMOpaqueLTOModule * lto_module_t
opaque reference to a loaded object module
Definition: lto.h:89
lto_module_t lto_module_create(const char *path)
Loads an object file from disk.
lto_codegen_diagnostic_severity_t
Diagnostic severity.
Definition: lto.h:300
void lto_codegen_set_should_internalize(lto_code_gen_t cg, lto_bool_t ShouldInternalize)
Sets if we should run internalize pass during optimization and code generation.
lto_symbol_attributes lto_module_get_symbol_attribute(lto_module_t mod, unsigned int index)
Returns the attributes of the ith symbol in the object module.
lto_module_t lto_module_create_from_fd_at_offset(int fd, const char *path, size_t file_size, size_t map_size, off_t offset)
Loads an object file from disk.
lto_bool_t lto_module_is_object_file_in_memory_for_target(const void *mem, size_t length, const char *target_triple_prefix)
Checks if a buffer is a loadable object compiled for requested target.
const void * lto_codegen_compile(lto_code_gen_t cg, size_t *length)
Generates code for all added modules into one native object file.
bool lto_bool_t
Definition: lto.h:25
void lto_codegen_set_module(lto_code_gen_t cg, lto_module_t mod)
Sets the object module for code generation.
std::error_code file_size(const Twine &Path, uint64_t &Result)
Get file size.
Definition: FileSystem.h:500
void lto_codegen_set_assembler_path(lto_code_gen_t cg, const char *path)
Sets the location of the assembler tool to run.
void lto_codegen_set_assembler_args(lto_code_gen_t cg, const char **args, int nargs)
Sets extra arguments that libLTO should pass to the assembler.
void lto_codegen_set_should_embed_uselists(lto_code_gen_t cg, lto_bool_t ShouldEmbedUselists)
Set whether to embed uselists in bitcode.
unsigned int lto_module_get_num_symbols(lto_module_t mod)
Returns the number of symbols in the object module.
lto_module_t lto_module_create_in_codegen_context(const void *mem, size_t length, const char *path, lto_code_gen_t cg)
Loads an object file in the codegen context.
lto_debug_model
Definition: lto.h:73
lto_bool_t lto_codegen_set_pic_model(lto_code_gen_t cg, lto_codegen_model)
Sets which PIC code model to generated.
lto_bool_t lto_module_is_object_file_for_target(const char *path, const char *target_triple_prefix)
Checks if a file is a loadable object compiled for requested target.
unsigned int lto_api_version(void)
Returns the runtime API version.
lto_module_t lto_module_create_from_memory_with_path(const void *mem, size_t length, const char *path)
Loads an object file from memory with an extra path argument.
lto_bool_t lto_codegen_compile_to_file(lto_code_gen_t cg, const char **name)
Generates code for all added modules into one native object file.
void lto_module_set_target_triple(lto_module_t mod, const char *triple)
Sets triple string with which the object will be codegened.
struct LLVMOpaqueLTOCodeGenerator * lto_code_gen_t
opaque reference to a code generator
Definition: lto.h:92
lto_module_t lto_module_create_from_memory(const void *mem, size_t length)
Loads an object file from memory.
void(* lto_diagnostic_handler_t)(lto_codegen_diagnostic_severity_t severity, const char *diag, void *ctxt)
Diagnostic handler type.
Definition: lto.h:316
void lto_codegen_debug_options(lto_code_gen_t cg, const char *)
Sets options to help debug codegen bugs.
lto_bool_t lto_codegen_optimize(lto_code_gen_t cg)
Runs optimization for the merged module.
lto_code_gen_t lto_codegen_create_in_local_context(void)
Instantiate a code generator in its own context.
lto_bool_t lto_module_is_object_file(const char *path)
Checks if a file is a loadable object file.
const char * lto_get_version(void)
Returns a printable string.
lto_codegen_model
Definition: lto.h:81
const char * lto_get_error_message(void)
Returns the last error string or NULL if last operation was successful.
void lto_codegen_set_cpu(lto_code_gen_t cg, const char *cpu)
Sets the cpu to generate code for.
lto_module_t lto_module_create_from_fd(int fd, const char *path, size_t file_size)
Loads an object file from disk.
void lto_codegen_add_must_preserve_symbol(lto_code_gen_t cg, const char *symbol)
Adds to a list of all global symbols that must exist in the final generated code. ...
void lto_initialize_disassembler(void)
Initializes LLVM disassemblers.
lto_symbol_attributes
Definition: lto.h:48
void lto_module_dispose(lto_module_t mod)
Frees all memory internally allocated by the module.
lto_bool_t lto_codegen_add_module(lto_code_gen_t cg, lto_module_t mod)
Add an object module to the set of modules for which code will be generated.
lto_bool_t lto_codegen_set_debug_model(lto_code_gen_t cg, lto_debug_model)
Sets if debug info should be generated.
const char * lto_module_get_linkeropts(lto_module_t mod)
Returns the module's linker options.
void lto_codegen_dispose(lto_code_gen_t)
Frees all code generator and all memory it internally allocated.
static const char * name
const char * lto_module_get_target_triple(lto_module_t mod)
Returns triple string which the object module was compiled under.
lto_bool_t lto_codegen_write_merged_modules(lto_code_gen_t cg, const char *path)
Writes a new object file at the specified path that contains the merged contents of all modules added...
const char * lto_module_get_symbol_name(lto_module_t mod, unsigned int index)
Returns the name of the ith symbol in the object module.
const void * lto_codegen_compile_optimized(lto_code_gen_t cg, size_t *length)
Generates code for the optimized merged module into one native object file.