1 //===-lto.cpp - LLVM Link Time Optimizer ----------------------------------===// 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 file implements the Link Time Optimization library. This library is 11 // intended to be used by linker to optimize code at link time. 12 // 13 //===----------------------------------------------------------------------===// 14 15 #include "llvm-c/lto.h" 16 #include "llvm-c/Core.h" 17 18 #include "LTOModule.h" 19 #include "LTOCodeGenerator.h" 20 21 22 // Holds most recent error string. 23 // *** Not thread safe *** 24 static std::string sLastErrorString; 25 26 /// lto_get_version - Returns a printable string. 27 extern const char* lto_get_version() { 28 return LTOCodeGenerator::getVersionString(); 29 } 30 31 /// lto_get_error_message - Returns the last error string or NULL if last 32 /// operation was successful. 33 const char* lto_get_error_message() { 34 return sLastErrorString.c_str(); 35 } 36 37 /// lto_module_is_object_file - Validates if a file is a loadable object file. 38 bool lto_module_is_object_file(const char* path) { 39 return LTOModule::isBitcodeFile(path); 40 } 41 42 /// lto_module_is_object_file_for_target - Validates if a file is a loadable 43 /// object file compilable for requested target. 44 bool lto_module_is_object_file_for_target(const char* path, 45 const char* target_triplet_prefix) { 46 return LTOModule::isBitcodeFileForTarget(path, target_triplet_prefix); 47 } 48 49 /// lto_module_is_object_file_in_memory - Validates if a buffer is a loadable 50 /// object file. 51 bool lto_module_is_object_file_in_memory(const void* mem, size_t length) { 52 return LTOModule::isBitcodeFile(mem, length); 53 } 54 55 /// lto_module_is_object_file_in_memory_for_target - Validates if a buffer is a 56 /// loadable object file compilable for the target. 57 bool 58 lto_module_is_object_file_in_memory_for_target(const void* mem, 59 size_t length, 60 const char* target_triplet_prefix) { 61 return LTOModule::isBitcodeFileForTarget(mem, length, target_triplet_prefix); 62 } 63 64 /// lto_module_create - Loads an object file from disk. Returns NULL on error 65 /// (check lto_get_error_message() for details). 66 lto_module_t lto_module_create(const char* path) { 67 return LTOModule::makeLTOModule(path, sLastErrorString); 68 } 69 70 /// lto_module_create_from_fd - Loads an object file from disk. Returns NULL on 71 /// error (check lto_get_error_message() for details). 72 lto_module_t lto_module_create_from_fd(int fd, const char *path, size_t size) { 73 return LTOModule::makeLTOModule(fd, path, size, sLastErrorString); 74 } 75 76 /// lto_module_create_from_fd_at_offset - Loads an object file from disk. 77 /// Returns NULL on error (check lto_get_error_message() for details). 78 lto_module_t lto_module_create_from_fd_at_offset(int fd, const char *path, 79 size_t file_size, 80 size_t map_size, 81 off_t offset) { 82 return LTOModule::makeLTOModule(fd, path, file_size, map_size, 83 offset, sLastErrorString); 84 } 85 86 /// lto_module_create_from_memory - Loads an object file from memory. Returns 87 /// NULL on error (check lto_get_error_message() for details). 88 lto_module_t lto_module_create_from_memory(const void* mem, size_t length) { 89 return LTOModule::makeLTOModule(mem, length, sLastErrorString); 90 } 91 92 /// lto_module_dispose - Frees all memory for a module. Upon return the 93 /// lto_module_t is no longer valid. 94 void lto_module_dispose(lto_module_t mod) { 95 delete mod; 96 } 97 98 /// lto_module_get_target_triple - Returns triplet string which the object 99 /// module was compiled under. 100 const char* lto_module_get_target_triple(lto_module_t mod) { 101 return mod->getTargetTriple(); 102 } 103 104 /// lto_module_set_target_triple - Sets triple string with which the object will 105 /// be codegened. 106 void lto_module_set_target_triple(lto_module_t mod, const char *triple) { 107 return mod->setTargetTriple(triple); 108 } 109 110 /// lto_module_get_num_symbols - Returns the number of symbols in the object 111 /// module. 112 unsigned int lto_module_get_num_symbols(lto_module_t mod) { 113 return mod->getSymbolCount(); 114 } 115 116 /// lto_module_get_symbol_name - Returns the name of the ith symbol in the 117 /// object module. 118 const char* lto_module_get_symbol_name(lto_module_t mod, unsigned int index) { 119 return mod->getSymbolName(index); 120 } 121 122 /// lto_module_get_symbol_attribute - Returns the attributes of the ith symbol 123 /// in the object module. 124 lto_symbol_attributes lto_module_get_symbol_attribute(lto_module_t mod, 125 unsigned int index) { 126 return mod->getSymbolAttributes(index); 127 } 128 129 /// lto_codegen_create - Instantiates a code generator. Returns NULL if there 130 /// is an error. 131 lto_code_gen_t lto_codegen_create(void) { 132 return new LTOCodeGenerator(); 133 } 134 135 /// lto_codegen_dispose - Frees all memory for a code generator. Upon return the 136 /// lto_code_gen_t is no longer valid. 137 void lto_codegen_dispose(lto_code_gen_t cg) { 138 delete cg; 139 } 140 141 /// lto_codegen_add_module - Add an object module to the set of modules for 142 /// which code will be generated. Returns true on error (check 143 /// lto_get_error_message() for details). 144 bool lto_codegen_add_module(lto_code_gen_t cg, lto_module_t mod) { 145 return cg->addModule(mod, sLastErrorString); 146 } 147 148 /// lto_codegen_set_debug_model - Sets what if any format of debug info should 149 /// be generated. Returns true on error (check lto_get_error_message() for 150 /// details). 151 bool lto_codegen_set_debug_model(lto_code_gen_t cg, lto_debug_model debug) { 152 return cg->setDebugInfo(debug, sLastErrorString); 153 } 154 155 /// lto_codegen_set_pic_model - Sets what code model to generated. Returns true 156 /// on error (check lto_get_error_message() for details). 157 bool lto_codegen_set_pic_model(lto_code_gen_t cg, lto_codegen_model model) { 158 return cg->setCodePICModel(model, sLastErrorString); 159 } 160 161 /// lto_codegen_set_cpu - Sets the cpu to generate code for. 162 void lto_codegen_set_cpu(lto_code_gen_t cg, const char *cpu) { 163 return cg->setCpu(cpu); 164 } 165 166 /// lto_codegen_set_assembler_path - Sets the path to the assembler tool. 167 void lto_codegen_set_assembler_path(lto_code_gen_t cg, const char *path) { 168 // In here only for backwards compatibility. We use MC now. 169 } 170 171 /// lto_codegen_set_assembler_args - Sets extra arguments that libLTO should 172 /// pass to the assembler. 173 void lto_codegen_set_assembler_args(lto_code_gen_t cg, const char **args, 174 int nargs) { 175 // In here only for backwards compatibility. We use MC now. 176 } 177 178 /// lto_codegen_add_must_preserve_symbol - Adds to a list of all global symbols 179 /// that must exist in the final generated code. If a function is not listed 180 /// there, it might be inlined into every usage and optimized away. 181 void lto_codegen_add_must_preserve_symbol(lto_code_gen_t cg, 182 const char *symbol) { 183 cg->addMustPreserveSymbol(symbol); 184 } 185 186 /// lto_codegen_write_merged_modules - Writes a new file at the specified path 187 /// that contains the merged contents of all modules added so far. Returns true 188 /// on error (check lto_get_error_message() for details). 189 bool lto_codegen_write_merged_modules(lto_code_gen_t cg, const char *path) { 190 return cg->writeMergedModules(path, sLastErrorString); 191 } 192 193 /// lto_codegen_compile - Generates code for all added modules into one native 194 /// object file. On success returns a pointer to a generated mach-o/ELF buffer 195 /// and length set to the buffer size. The buffer is owned by the lto_code_gen_t 196 /// object and will be freed when lto_codegen_dispose() is called, or 197 /// lto_codegen_compile() is called again. On failure, returns NULL (check 198 /// lto_get_error_message() for details). 199 const void *lto_codegen_compile(lto_code_gen_t cg, size_t *length) { 200 return cg->compile(length, sLastErrorString); 201 } 202 203 /// lto_codegen_compile_to_file - Generates code for all added modules into one 204 /// native object file. The name of the file is written to name. Returns true on 205 /// error. 206 bool lto_codegen_compile_to_file(lto_code_gen_t cg, const char **name) { 207 return cg->compile_to_file(name, sLastErrorString); 208 } 209 210 /// lto_codegen_debug_options - Used to pass extra options to the code 211 /// generator. 212 void lto_codegen_debug_options(lto_code_gen_t cg, const char *opt) { 213 cg->setCodeGenDebugOptions(opt); 214 } 215
