lto.cpp revision 2d643ef32891859ec73b6eea2959748f5ebc3af7
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 *** 24static std::string sLastErrorString; 25 26 27 28// 29// returns a printable string 30// 31extern const char* lto_get_version() 32{ 33 return LTOCodeGenerator::getVersionString(); 34} 35 36// 37// returns the last error string or NULL if last operation was successful 38// 39const char* lto_get_error_message() 40{ 41 return sLastErrorString.c_str(); 42} 43 44 45 46// 47// validates if a file is a loadable object file 48// 49bool lto_module_is_object_file(const char* path) 50{ 51 return LTOModule::isBitcodeFile(path); 52} 53 54 55// 56// validates if a file is a loadable object file compilable for requested target 57// 58bool lto_module_is_object_file_for_target(const char* path, 59 const char* target_triplet_prefix) 60{ 61 return LTOModule::isBitcodeFileForTarget(path, target_triplet_prefix); 62} 63 64 65// 66// validates if a buffer is a loadable object file 67// 68bool lto_module_is_object_file_in_memory(const void* mem, size_t length) 69{ 70 return LTOModule::isBitcodeFile(mem, length); 71} 72 73 74// 75// validates if a buffer is a loadable object file compilable for the target 76// 77bool lto_module_is_object_file_in_memory_for_target(const void* mem, 78 size_t length, const char* target_triplet_prefix) 79{ 80 return LTOModule::isBitcodeFileForTarget(mem, length, target_triplet_prefix); 81} 82 83 84 85// 86// loads an object file from disk 87// returns NULL on error (check lto_get_error_message() for details) 88// 89lto_module_t lto_module_create(const char* path) 90{ 91 return LTOModule::makeLTOModule(path, sLastErrorString); 92} 93 94 95// 96// loads an object file from memory 97// returns NULL on error (check lto_get_error_message() for details) 98// 99lto_module_t lto_module_create_from_memory(const void* mem, size_t length) 100{ 101 return LTOModule::makeLTOModule(mem, length, sLastErrorString); 102} 103 104 105// 106// frees all memory for a module 107// upon return the lto_module_t is no longer valid 108// 109void lto_module_dispose(lto_module_t mod) 110{ 111 delete mod; 112} 113 114 115// 116// returns triplet string which the object module was compiled under 117// 118const char* lto_module_get_target_triple(lto_module_t mod) 119{ 120 return mod->getTargetTriple(); 121} 122 123// 124// sets triple string with which the object will be codegened. 125// 126void lto_module_set_target_triple(lto_module_t mod, const char *triple) 127{ 128 return mod->setTargetTriple(triple); 129} 130 131 132// 133// returns the number of symbols in the object module 134// 135uint32_t lto_module_get_num_symbols(lto_module_t mod) 136{ 137 return mod->getSymbolCount(); 138} 139 140// 141// returns the name of the ith symbol in the object module 142// 143const char* lto_module_get_symbol_name(lto_module_t mod, uint32_t index) 144{ 145 return mod->getSymbolName(index); 146} 147 148 149// 150// returns the attributes of the ith symbol in the object module 151// 152lto_symbol_attributes lto_module_get_symbol_attribute(lto_module_t mod, 153 uint32_t index) 154{ 155 return mod->getSymbolAttributes(index); 156} 157 158 159 160 161 162// 163// instantiates a code generator 164// returns NULL if there is an error 165// 166lto_code_gen_t lto_codegen_create(void) 167{ 168 return new LTOCodeGenerator(); 169} 170 171 172 173// 174// frees all memory for a code generator 175// upon return the lto_code_gen_t is no longer valid 176// 177void lto_codegen_dispose(lto_code_gen_t cg) 178{ 179 delete cg; 180} 181 182 183 184// 185// add an object module to the set of modules for which code will be generated 186// returns true on error (check lto_get_error_message() for details) 187// 188bool lto_codegen_add_module(lto_code_gen_t cg, lto_module_t mod) 189{ 190 return cg->addModule(mod, sLastErrorString); 191} 192 193 194// 195// sets what if any format of debug info should be generated 196// returns true on error (check lto_get_error_message() for details) 197// 198bool lto_codegen_set_debug_model(lto_code_gen_t cg, lto_debug_model debug) 199{ 200 return cg->setDebugInfo(debug, sLastErrorString); 201} 202 203 204// 205// sets what code model to generated 206// returns true on error (check lto_get_error_message() for details) 207// 208bool lto_codegen_set_pic_model(lto_code_gen_t cg, lto_codegen_model model) 209{ 210 return cg->setCodePICModel(model, sLastErrorString); 211} 212 213// 214// sets the cpu to generate code for 215// 216void lto_codegen_set_cpu(lto_code_gen_t cg, const char* cpu) 217{ 218 return cg->setCpu(cpu); 219} 220 221// 222// sets the path to the assembler tool 223// 224void lto_codegen_set_assembler_path(lto_code_gen_t cg, const char* path) 225{ 226 cg->setAssemblerPath(path); 227} 228 229 230// 231// sets extra arguments that libLTO should pass to the assembler 232// 233void lto_codegen_set_assembler_args(lto_code_gen_t cg, const char** args, 234 int nargs) 235{ 236 cg->setAssemblerArgs(args, nargs); 237} 238 239// 240// adds to a list of all global symbols that must exist in the final 241// generated code. If a function is not listed there, it might be 242// inlined into every usage and optimized away. 243// 244void lto_codegen_add_must_preserve_symbol(lto_code_gen_t cg, const char* symbol) 245{ 246 cg->addMustPreserveSymbol(symbol); 247} 248 249 250// 251// writes a new file at the specified path that contains the 252// merged contents of all modules added so far. 253// returns true on error (check lto_get_error_message() for details) 254// 255bool lto_codegen_write_merged_modules(lto_code_gen_t cg, const char* path) 256{ 257 return cg->writeMergedModules(path, sLastErrorString); 258} 259 260 261// 262// Generates code for all added modules into one native object file. 263// On sucess returns a pointer to a generated mach-o/ELF buffer and 264// length set to the buffer size. The buffer is owned by the 265// lto_code_gen_t and will be freed when lto_codegen_dispose() 266// is called, or lto_codegen_compile() is called again. 267// On failure, returns NULL (check lto_get_error_message() for details). 268// 269extern const void* 270lto_codegen_compile(lto_code_gen_t cg, size_t* length) 271{ 272 return cg->compile(length, sLastErrorString); 273} 274 275 276// 277// Used to pass extra options to the code generator 278// 279extern void 280lto_codegen_debug_options(lto_code_gen_t cg, const char * opt) 281{ 282 cg->setCodeGenDebugOptions(opt); 283} 284