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 "LTOCodeGenerator.h" 17 #include "LTOModule.h" 18 #include "llvm-c/Core.h" 19 20 21 // Holds most recent error string. 22 // *** Not thread safe *** 23 static std::string sLastErrorString; 24 25 /// lto_get_version - Returns a printable string. 26 extern const char* lto_get_version() { 27 return LTOCodeGenerator::getVersionString(); 28 } 29 30 /// lto_get_error_message - Returns the last error string or NULL if last 31 /// operation was successful. 32 const char* lto_get_error_message() { 33 return sLastErrorString.c_str(); 34 } 35 36 /// lto_module_is_object_file - Validates if a file is a loadable object file. 37 bool lto_module_is_object_file(const char* path) { 38 return LTOModule::isBitcodeFile(path); 39 } 40 41 /// lto_module_is_object_file_for_target - Validates if a file is a loadable 42 /// object file compilable for requested target. 43 bool lto_module_is_object_file_for_target(const char* path, 44 const char* target_triplet_prefix) { 45 return LTOModule::isBitcodeFileForTarget(path, target_triplet_prefix); 46 } 47 48 /// lto_module_is_object_file_in_memory - Validates if a buffer is a loadable 49 /// object file. 50 bool lto_module_is_object_file_in_memory(const void* mem, size_t length) { 51 return LTOModule::isBitcodeFile(mem, length); 52 } 53 54 /// lto_module_is_object_file_in_memory_for_target - Validates if a buffer is a 55 /// loadable object file compilable for the target. 56 bool 57 lto_module_is_object_file_in_memory_for_target(const void* mem, 58 size_t length, 59 const char* target_triplet_prefix) { 60 return LTOModule::isBitcodeFileForTarget(mem, length, target_triplet_prefix); 61 } 62 63 /// lto_module_create - Loads an object file from disk. Returns NULL on error 64 /// (check lto_get_error_message() for details). 65 lto_module_t lto_module_create(const char* path) { 66 return LTOModule::makeLTOModule(path, sLastErrorString); 67 } 68 69 /// lto_module_create_from_fd - Loads an object file from disk. Returns NULL on 70 /// error (check lto_get_error_message() for details). 71 lto_module_t lto_module_create_from_fd(int fd, const char *path, size_t size) { 72 return LTOModule::makeLTOModule(fd, path, size, sLastErrorString); 73 } 74 75 /// lto_module_create_from_fd_at_offset - Loads an object file from disk. 76 /// Returns NULL on error (check lto_get_error_message() for details). 77 lto_module_t lto_module_create_from_fd_at_offset(int fd, const char *path, 78 size_t file_size, 79 size_t map_size, 80 off_t offset) { 81 return LTOModule::makeLTOModule(fd, path, map_size, offset, sLastErrorString); 82 } 83 84 /// lto_module_create_from_memory - Loads an object file from memory. Returns 85 /// NULL on error (check lto_get_error_message() for details). 86 lto_module_t lto_module_create_from_memory(const void* mem, size_t length) { 87 return LTOModule::makeLTOModule(mem, length, sLastErrorString); 88 } 89 90 /// lto_module_dispose - Frees all memory for a module. Upon return the 91 /// lto_module_t is no longer valid. 92 void lto_module_dispose(lto_module_t mod) { 93 delete mod; 94 } 95 96 /// lto_module_get_target_triple - Returns triplet string which the object 97 /// module was compiled under. 98 const char* lto_module_get_target_triple(lto_module_t mod) { 99 return mod->getTargetTriple(); 100 } 101 102 /// lto_module_set_target_triple - Sets triple string with which the object will 103 /// be codegened. 104 void lto_module_set_target_triple(lto_module_t mod, const char *triple) { 105 return mod->setTargetTriple(triple); 106 } 107 108 /// lto_module_get_num_symbols - Returns the number of symbols in the object 109 /// module. 110 unsigned int lto_module_get_num_symbols(lto_module_t mod) { 111 return mod->getSymbolCount(); 112 } 113 114 /// lto_module_get_symbol_name - Returns the name of the ith symbol in the 115 /// object module. 116 const char* lto_module_get_symbol_name(lto_module_t mod, unsigned int index) { 117 return mod->getSymbolName(index); 118 } 119 120 /// lto_module_get_symbol_attribute - Returns the attributes of the ith symbol 121 /// in the object module. 122 lto_symbol_attributes lto_module_get_symbol_attribute(lto_module_t mod, 123 unsigned int index) { 124 return mod->getSymbolAttributes(index); 125 } 126 127 /// lto_codegen_create - Instantiates a code generator. Returns NULL if there 128 /// is an error. 129 lto_code_gen_t lto_codegen_create(void) { 130 return new LTOCodeGenerator(); 131 } 132 133 /// lto_codegen_dispose - Frees all memory for a code generator. Upon return the 134 /// lto_code_gen_t is no longer valid. 135 void lto_codegen_dispose(lto_code_gen_t cg) { 136 delete cg; 137 } 138 139 /// lto_codegen_add_module - Add an object module to the set of modules for 140 /// which code will be generated. Returns true on error (check 141 /// lto_get_error_message() for details). 142 bool lto_codegen_add_module(lto_code_gen_t cg, lto_module_t mod) { 143 return !cg->addModule(mod, sLastErrorString); 144 } 145 146 /// lto_codegen_set_debug_model - Sets what if any format of debug info should 147 /// be generated. Returns true on error (check lto_get_error_message() for 148 /// details). 149 bool lto_codegen_set_debug_model(lto_code_gen_t cg, lto_debug_model debug) { 150 cg->setDebugInfo(debug); 151 return false; 152 } 153 154 /// lto_codegen_set_pic_model - Sets what code model to generated. Returns true 155 /// on error (check lto_get_error_message() for details). 156 bool lto_codegen_set_pic_model(lto_code_gen_t cg, lto_codegen_model model) { 157 cg->setCodePICModel(model); 158 return false; 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
