lto.cpp revision 3e4c41a84a2c0f055e2bfef48a66b5890bcfd5e5
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// 125// returns the number of symbols in the object module 126// 127uint32_t lto_module_get_num_symbols(lto_module_t mod) 128{ 129 return mod->getSymbolCount(); 130} 131 132// 133// returns the name of the ith symbol in the object module 134// 135const char* lto_module_get_symbol_name(lto_module_t mod, uint32_t index) 136{ 137 return mod->getSymbolName(index); 138} 139 140 141// 142// returns the attributes of the ith symbol in the object module 143// 144lto_symbol_attributes lto_module_get_symbol_attribute(lto_module_t mod, 145 uint32_t index) 146{ 147 return mod->getSymbolAttributes(index); 148} 149 150 151 152 153 154// 155// instantiates a code generator 156// returns NULL if there is an error 157// 158lto_code_gen_t lto_codegen_create(void) 159{ 160 return new LTOCodeGenerator(); 161} 162 163 164 165// 166// frees all memory for a code generator 167// upon return the lto_code_gen_t is no longer valid 168// 169void lto_codegen_dispose(lto_code_gen_t cg) 170{ 171 delete cg; 172} 173 174 175 176// 177// add an object module to the set of modules for which code will be generated 178// returns true on error (check lto_get_error_message() for details) 179// 180bool lto_codegen_add_module(lto_code_gen_t cg, lto_module_t mod) 181{ 182 return cg->addModule(mod, sLastErrorString); 183} 184 185 186// 187// sets what if any format of debug info should be generated 188// returns true on error (check lto_get_error_message() for details) 189// 190bool lto_codegen_set_debug_model(lto_code_gen_t cg, lto_debug_model debug) 191{ 192 return cg->setDebugInfo(debug, sLastErrorString); 193} 194 195 196// 197// sets what code model to generated 198// returns true on error (check lto_get_error_message() for details) 199// 200bool lto_codegen_set_pic_model(lto_code_gen_t cg, lto_codegen_model model) 201{ 202 return cg->setCodePICModel(model, sLastErrorString); 203} 204 205// 206// sets the path to the assembler tool 207// 208void lto_codegen_set_assembler_path(lto_code_gen_t cg, const char* path) 209{ 210 cg->setAssemblerPath(path); 211} 212 213// 214// adds to a list of all global symbols that must exist in the final 215// generated code. If a function is not listed there, it might be 216// inlined into every usage and optimized away. 217// 218void lto_codegen_add_must_preserve_symbol(lto_code_gen_t cg, const char* symbol) 219{ 220 cg->addMustPreserveSymbol(symbol); 221} 222 223 224// 225// writes a new file at the specified path that contains the 226// merged contents of all modules added so far. 227// returns true on error (check lto_get_error_message() for details) 228// 229bool lto_codegen_write_merged_modules(lto_code_gen_t cg, const char* path) 230{ 231 return cg->writeMergedModules(path, sLastErrorString); 232} 233 234 235// 236// Generates code for all added modules into one native object file. 237// On sucess returns a pointer to a generated mach-o/ELF buffer and 238// length set to the buffer size. The buffer is owned by the 239// lto_code_gen_t and will be freed when lto_codegen_dispose() 240// is called, or lto_codegen_compile() is called again. 241// On failure, returns NULL (check lto_get_error_message() for details). 242// 243extern const void* 244lto_codegen_compile(lto_code_gen_t cg, size_t* length) 245{ 246 return cg->compile(length, sLastErrorString); 247} 248 249 250// 251// Used to pass extra options to the code generator 252// 253extern void 254lto_codegen_debug_options(lto_code_gen_t cg, const char * opt) 255{ 256 cg->setCodeGenDebugOptions(opt); 257} 258