lto.cpp revision f010c464a11444733ec67e31aace8bcebeaf2588
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 *** 23static std::string sLastErrorString; 24 25/// lto_get_version - Returns a printable string. 26extern 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. 32const 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. 37bool 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. 43bool 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. 50bool 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. 56bool 57lto_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). 65lto_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). 71lto_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). 77lto_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, file_size, map_size, 82 offset, sLastErrorString); 83} 84 85/// lto_module_create_from_memory - Loads an object file from memory. Returns 86/// NULL on error (check lto_get_error_message() for details). 87lto_module_t lto_module_create_from_memory(const void* mem, size_t length) { 88 return LTOModule::makeLTOModule(mem, length, sLastErrorString); 89} 90 91/// lto_module_dispose - Frees all memory for a module. Upon return the 92/// lto_module_t is no longer valid. 93void lto_module_dispose(lto_module_t mod) { 94 delete mod; 95} 96 97/// lto_module_get_target_triple - Returns triplet string which the object 98/// module was compiled under. 99const char* lto_module_get_target_triple(lto_module_t mod) { 100 return mod->getTargetTriple(); 101} 102 103/// lto_module_set_target_triple - Sets triple string with which the object will 104/// be codegened. 105void lto_module_set_target_triple(lto_module_t mod, const char *triple) { 106 return mod->setTargetTriple(triple); 107} 108 109/// lto_module_get_num_symbols - Returns the number of symbols in the object 110/// module. 111unsigned int lto_module_get_num_symbols(lto_module_t mod) { 112 return mod->getSymbolCount(); 113} 114 115/// lto_module_get_symbol_name - Returns the name of the ith symbol in the 116/// object module. 117const char* lto_module_get_symbol_name(lto_module_t mod, unsigned int index) { 118 return mod->getSymbolName(index); 119} 120 121/// lto_module_get_symbol_attribute - Returns the attributes of the ith symbol 122/// in the object module. 123lto_symbol_attributes lto_module_get_symbol_attribute(lto_module_t mod, 124 unsigned int index) { 125 return mod->getSymbolAttributes(index); 126} 127 128/// lto_codegen_create - Instantiates a code generator. Returns NULL if there 129/// is an error. 130lto_code_gen_t lto_codegen_create(void) { 131 return new LTOCodeGenerator(); 132} 133 134/// lto_codegen_dispose - Frees all memory for a code generator. Upon return the 135/// lto_code_gen_t is no longer valid. 136void lto_codegen_dispose(lto_code_gen_t cg) { 137 delete cg; 138} 139 140/// lto_codegen_add_module - Add an object module to the set of modules for 141/// which code will be generated. Returns true on error (check 142/// lto_get_error_message() for details). 143bool lto_codegen_add_module(lto_code_gen_t cg, lto_module_t mod) { 144 return cg->addModule(mod, sLastErrorString); 145} 146 147/// lto_codegen_set_debug_model - Sets what if any format of debug info should 148/// be generated. Returns true on error (check lto_get_error_message() for 149/// details). 150bool lto_codegen_set_debug_model(lto_code_gen_t cg, lto_debug_model debug) { 151 return cg->setDebugInfo(debug, sLastErrorString); 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). 156bool lto_codegen_set_pic_model(lto_code_gen_t cg, lto_codegen_model model) { 157 return cg->setCodePICModel(model, sLastErrorString); 158} 159 160/// lto_codegen_set_cpu - Sets the cpu to generate code for. 161void lto_codegen_set_cpu(lto_code_gen_t cg, const char *cpu) { 162 return cg->setCpu(cpu); 163} 164 165/// lto_codegen_set_assembler_path - Sets the path to the assembler tool. 166void lto_codegen_set_assembler_path(lto_code_gen_t cg, const char *path) { 167 // In here only for backwards compatibility. We use MC now. 168} 169 170/// lto_codegen_set_assembler_args - Sets extra arguments that libLTO should 171/// pass to the assembler. 172void lto_codegen_set_assembler_args(lto_code_gen_t cg, const char **args, 173 int nargs) { 174 // In here only for backwards compatibility. We use MC now. 175} 176 177/// lto_codegen_add_must_preserve_symbol - Adds to a list of all global symbols 178/// that must exist in the final generated code. If a function is not listed 179/// there, it might be inlined into every usage and optimized away. 180void lto_codegen_add_must_preserve_symbol(lto_code_gen_t cg, 181 const char *symbol) { 182 cg->addMustPreserveSymbol(symbol); 183} 184 185/// lto_codegen_write_merged_modules - Writes a new file at the specified path 186/// that contains the merged contents of all modules added so far. Returns true 187/// on error (check lto_get_error_message() for details). 188bool lto_codegen_write_merged_modules(lto_code_gen_t cg, const char *path) { 189 return cg->writeMergedModules(path, sLastErrorString); 190} 191 192/// lto_codegen_compile - Generates code for all added modules into one native 193/// object file. On success returns a pointer to a generated mach-o/ELF buffer 194/// and length set to the buffer size. The buffer is owned by the lto_code_gen_t 195/// object and will be freed when lto_codegen_dispose() is called, or 196/// lto_codegen_compile() is called again. On failure, returns NULL (check 197/// lto_get_error_message() for details). 198const void *lto_codegen_compile(lto_code_gen_t cg, size_t *length) { 199 return cg->compile(length, sLastErrorString); 200} 201 202/// lto_codegen_compile_to_file - Generates code for all added modules into one 203/// native object file. The name of the file is written to name. Returns true on 204/// error. 205bool lto_codegen_compile_to_file(lto_code_gen_t cg, const char **name) { 206 return cg->compile_to_file(name, sLastErrorString); 207} 208 209/// lto_codegen_debug_options - Used to pass extra options to the code 210/// generator. 211void lto_codegen_debug_options(lto_code_gen_t cg, const char *opt) { 212 cg->setCodeGenDebugOptions(opt); 213} 214