Home | History | Annotate | Download | only in lto 
      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/CodeGen/CommandFlags.h"
     17 #include "llvm/LTO/LTOCodeGenerator.h"
     18 #include "llvm/LTO/LTOModule.h"
     19 #include "llvm/Support/MemoryBuffer.h"
     20 #include "llvm/Support/TargetSelect.h"
     21 
     22 // extra command-line flags needed for LTOCodeGenerator
     23 static cl::opt<bool>
     24 DisableOpt("disable-opt", cl::init(false),
     25   cl::desc("Do not run any optimization passes"));
     26 
     27 static cl::opt<bool>
     28 DisableInline("disable-inlining", cl::init(false),
     29   cl::desc("Do not run the inliner pass"));
     30 
     31 static cl::opt<bool>
     32 DisableGVNLoadPRE("disable-gvn-loadpre", cl::init(false),
     33   cl::desc("Do not run the GVN load PRE pass"));
     34 
     35 // Holds most recent error string.
     36 // *** Not thread safe ***
     37 static std::string sLastErrorString;
     38 
     39 // Holds the initialization state of the LTO module.
     40 // *** Not thread safe ***
     41 static bool initialized = false;
     42 
     43 // Holds the command-line option parsing state of the LTO module.
     44 static bool parsedOptions = false;
     45 
     46 // Initialize the configured targets if they have not been initialized.
     47 static void lto_initialize() {
     48   if (!initialized) {
     49     InitializeAllTargetInfos();
     50     InitializeAllTargets();
     51     InitializeAllTargetMCs();
     52     InitializeAllAsmParsers();
     53     InitializeAllAsmPrinters();
     54     InitializeAllDisassemblers();
     55     initialized = true;
     56   }
     57 }
     58 
     59 DEFINE_SIMPLE_CONVERSION_FUNCTIONS(LTOCodeGenerator, lto_code_gen_t)
     60 DEFINE_SIMPLE_CONVERSION_FUNCTIONS(LTOModule, lto_module_t)
     61 
     62 // Convert the subtarget features into a string to pass to LTOCodeGenerator.
     63 static void lto_add_attrs(lto_code_gen_t cg) {
     64   LTOCodeGenerator *CG = unwrap(cg);
     65   if (MAttrs.size()) {
     66     std::string attrs;
     67     for (unsigned i = 0; i < MAttrs.size(); ++i) {
     68       if (i > 0)
     69         attrs.append(",");
     70       attrs.append(MAttrs[i]);
     71     }
     72 
     73     CG->setAttr(attrs.c_str());
     74   }
     75 }
     76 
     77 extern const char* lto_get_version() {
     78   return LTOCodeGenerator::getVersionString();
     79 }
     80 
     81 const char* lto_get_error_message() {
     82   return sLastErrorString.c_str();
     83 }
     84 
     85 bool lto_module_is_object_file(const char* path) {
     86   return LTOModule::isBitcodeFile(path);
     87 }
     88 
     89 bool lto_module_is_object_file_for_target(const char* path,
     90                                           const char* target_triplet_prefix) {
     91   ErrorOr<std::unique_ptr<MemoryBuffer>> Buffer = MemoryBuffer::getFile(path);
     92   if (!Buffer)
     93     return false;
     94   return LTOModule::isBitcodeForTarget(Buffer->get(), target_triplet_prefix);
     95 }
     96 
     97 bool lto_module_is_object_file_in_memory(const void* mem, size_t length) {
     98   return LTOModule::isBitcodeFile(mem, length);
     99 }
    100 
    101 bool
    102 lto_module_is_object_file_in_memory_for_target(const void* mem,
    103                                             size_t length,
    104                                             const char* target_triplet_prefix) {
    105   std::unique_ptr<MemoryBuffer> buffer(LTOModule::makeBuffer(mem, length));
    106   if (!buffer)
    107     return false;
    108   return LTOModule::isBitcodeForTarget(buffer.get(), target_triplet_prefix);
    109 }
    110 
    111 lto_module_t lto_module_create(const char* path) {
    112   lto_initialize();
    113   llvm::TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
    114   return wrap(LTOModule::createFromFile(path, Options, sLastErrorString));
    115 }
    116 
    117 lto_module_t lto_module_create_from_fd(int fd, const char *path, size_t size) {
    118   lto_initialize();
    119   llvm::TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
    120   return wrap(
    121       LTOModule::createFromOpenFile(fd, path, size, Options, sLastErrorString));
    122 }
    123 
    124 lto_module_t lto_module_create_from_fd_at_offset(int fd, const char *path,
    125                                                  size_t file_size,
    126                                                  size_t map_size,
    127                                                  off_t offset) {
    128   lto_initialize();
    129   llvm::TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
    130   return wrap(LTOModule::createFromOpenFileSlice(fd, path, map_size, offset,
    131                                                  Options, sLastErrorString));
    132 }
    133 
    134 lto_module_t lto_module_create_from_memory(const void* mem, size_t length) {
    135   lto_initialize();
    136   llvm::TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
    137   return wrap(LTOModule::createFromBuffer(mem, length, Options, sLastErrorString));
    138 }
    139 
    140 lto_module_t lto_module_create_from_memory_with_path(const void* mem,
    141                                                      size_t length,
    142                                                      const char *path) {
    143   lto_initialize();
    144   llvm::TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
    145   return wrap(
    146       LTOModule::createFromBuffer(mem, length, Options, sLastErrorString, path));
    147 }
    148 
    149 void lto_module_dispose(lto_module_t mod) { delete unwrap(mod); }
    150 
    151 const char* lto_module_get_target_triple(lto_module_t mod) {
    152   return unwrap(mod)->getTargetTriple().c_str();
    153 }
    154 
    155 void lto_module_set_target_triple(lto_module_t mod, const char *triple) {
    156   return unwrap(mod)->setTargetTriple(triple);
    157 }
    158 
    159 unsigned int lto_module_get_num_symbols(lto_module_t mod) {
    160   return unwrap(mod)->getSymbolCount();
    161 }
    162 
    163 const char* lto_module_get_symbol_name(lto_module_t mod, unsigned int index) {
    164   return unwrap(mod)->getSymbolName(index);
    165 }
    166 
    167 lto_symbol_attributes lto_module_get_symbol_attribute(lto_module_t mod,
    168                                                       unsigned int index) {
    169   return unwrap(mod)->getSymbolAttributes(index);
    170 }
    171 
    172 unsigned int lto_module_get_num_deplibs(lto_module_t mod) {
    173   return unwrap(mod)->getDependentLibraryCount();
    174 }
    175 
    176 const char* lto_module_get_deplib(lto_module_t mod, unsigned int index) {
    177   return unwrap(mod)->getDependentLibrary(index);
    178 }
    179 
    180 unsigned int lto_module_get_num_linkeropts(lto_module_t mod) {
    181   return unwrap(mod)->getLinkerOptCount();
    182 }
    183 
    184 const char* lto_module_get_linkeropt(lto_module_t mod, unsigned int index) {
    185   return unwrap(mod)->getLinkerOpt(index);
    186 }
    187 
    188 void lto_codegen_set_diagnostic_handler(lto_code_gen_t cg,
    189                                         lto_diagnostic_handler_t diag_handler,
    190                                         void *ctxt) {
    191   unwrap(cg)->setDiagnosticHandler(diag_handler, ctxt);
    192 }
    193 
    194 lto_code_gen_t lto_codegen_create(void) {
    195   lto_initialize();
    196 
    197   TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
    198 
    199   LTOCodeGenerator *CodeGen = new LTOCodeGenerator();
    200   if (CodeGen)
    201     CodeGen->setTargetOptions(Options);
    202   return wrap(CodeGen);
    203 }
    204 
    205 void lto_codegen_dispose(lto_code_gen_t cg) { delete unwrap(cg); }
    206 
    207 bool lto_codegen_add_module(lto_code_gen_t cg, lto_module_t mod) {
    208   return !unwrap(cg)->addModule(unwrap(mod), sLastErrorString);
    209 }
    210 
    211 bool lto_codegen_set_debug_model(lto_code_gen_t cg, lto_debug_model debug) {
    212   unwrap(cg)->setDebugInfo(debug);
    213   return false;
    214 }
    215 
    216 bool lto_codegen_set_pic_model(lto_code_gen_t cg, lto_codegen_model model) {
    217   unwrap(cg)->setCodePICModel(model);
    218   return false;
    219 }
    220 
    221 void lto_codegen_set_cpu(lto_code_gen_t cg, const char *cpu) {
    222   return unwrap(cg)->setCpu(cpu);
    223 }
    224 
    225 void lto_codegen_set_attr(lto_code_gen_t cg, const char *attr) {
    226   return unwrap(cg)->setAttr(attr);
    227 }
    228 
    229 void lto_codegen_set_assembler_path(lto_code_gen_t cg, const char *path) {
    230   // In here only for backwards compatibility. We use MC now.
    231 }
    232 
    233 void lto_codegen_set_assembler_args(lto_code_gen_t cg, const char **args,
    234                                     int nargs) {
    235   // In here only for backwards compatibility. We use MC now.
    236 }
    237 
    238 void lto_codegen_add_must_preserve_symbol(lto_code_gen_t cg,
    239                                           const char *symbol) {
    240   unwrap(cg)->addMustPreserveSymbol(symbol);
    241 }
    242 
    243 bool lto_codegen_write_merged_modules(lto_code_gen_t cg, const char *path) {
    244   if (!parsedOptions) {
    245     unwrap(cg)->parseCodeGenDebugOptions();
    246     lto_add_attrs(cg);
    247     parsedOptions = true;
    248   }
    249   return !unwrap(cg)->writeMergedModules(path, sLastErrorString);
    250 }
    251 
    252 const void *lto_codegen_compile(lto_code_gen_t cg, size_t *length) {
    253   if (!parsedOptions) {
    254     unwrap(cg)->parseCodeGenDebugOptions();
    255     lto_add_attrs(cg);
    256     parsedOptions = true;
    257   }
    258   return unwrap(cg)->compile(length, DisableOpt, DisableInline,
    259                              DisableGVNLoadPRE, sLastErrorString);
    260 }
    261 
    262 bool lto_codegen_compile_to_file(lto_code_gen_t cg, const char **name) {
    263   if (!parsedOptions) {
    264     unwrap(cg)->parseCodeGenDebugOptions();
    265     lto_add_attrs(cg);
    266     parsedOptions = true;
    267   }
    268   return !unwrap(cg)->compile_to_file(name, DisableOpt, DisableInline,
    269                                       DisableGVNLoadPRE, sLastErrorString);
    270 }
    271 
    272 void lto_codegen_debug_options(lto_code_gen_t cg, const char *opt) {
    273   unwrap(cg)->setCodeGenDebugOptions(opt);
    274 }
    275