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The linker will call `lto_codegen_add_must_preserve_symbol' on all globals that should be kept around. The linker will pretend that a dylib is being created. <rdar://problem/12528059> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169770 91177308-0d34-0410-b5e6-96231b3b80d8
214 lines
8.4 KiB
C++
214 lines
8.4 KiB
C++
//===-lto.cpp - LLVM Link Time Optimizer ----------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the Link Time Optimization library. This library is
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// intended to be used by linker to optimize code at link time.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm-c/lto.h"
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#include "LTOCodeGenerator.h"
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#include "LTOModule.h"
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#include "llvm-c/Core.h"
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// Holds most recent error string.
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// *** Not thread safe ***
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static std::string sLastErrorString;
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/// lto_get_version - Returns a printable string.
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extern const char* lto_get_version() {
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return LTOCodeGenerator::getVersionString();
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}
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/// lto_get_error_message - Returns the last error string or NULL if last
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/// operation was successful.
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const char* lto_get_error_message() {
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return sLastErrorString.c_str();
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}
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/// lto_module_is_object_file - Validates if a file is a loadable object file.
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bool lto_module_is_object_file(const char* path) {
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return LTOModule::isBitcodeFile(path);
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}
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/// lto_module_is_object_file_for_target - Validates if a file is a loadable
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/// object file compilable for requested target.
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bool lto_module_is_object_file_for_target(const char* path,
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const char* target_triplet_prefix) {
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return LTOModule::isBitcodeFileForTarget(path, target_triplet_prefix);
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}
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/// lto_module_is_object_file_in_memory - Validates if a buffer is a loadable
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/// object file.
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bool lto_module_is_object_file_in_memory(const void* mem, size_t length) {
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return LTOModule::isBitcodeFile(mem, length);
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}
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/// lto_module_is_object_file_in_memory_for_target - Validates if a buffer is a
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/// loadable object file compilable for the target.
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bool
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lto_module_is_object_file_in_memory_for_target(const void* mem,
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size_t length,
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const char* target_triplet_prefix) {
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return LTOModule::isBitcodeFileForTarget(mem, length, target_triplet_prefix);
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}
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/// lto_module_create - Loads an object file from disk. Returns NULL on error
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/// (check lto_get_error_message() for details).
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lto_module_t lto_module_create(const char* path) {
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return LTOModule::makeLTOModule(path, sLastErrorString);
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}
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/// lto_module_create_from_fd - Loads an object file from disk. Returns NULL on
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/// error (check lto_get_error_message() for details).
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lto_module_t lto_module_create_from_fd(int fd, const char *path, size_t size) {
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return LTOModule::makeLTOModule(fd, path, size, sLastErrorString);
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}
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/// lto_module_create_from_fd_at_offset - Loads an object file from disk.
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/// Returns NULL on error (check lto_get_error_message() for details).
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lto_module_t lto_module_create_from_fd_at_offset(int fd, const char *path,
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size_t file_size,
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size_t map_size,
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off_t offset) {
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return LTOModule::makeLTOModule(fd, path, file_size, map_size,
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offset, sLastErrorString);
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}
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/// lto_module_create_from_memory - Loads an object file from memory. Returns
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/// NULL on error (check lto_get_error_message() for details).
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lto_module_t lto_module_create_from_memory(const void* mem, size_t length) {
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return LTOModule::makeLTOModule(mem, length, sLastErrorString);
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}
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/// lto_module_dispose - Frees all memory for a module. Upon return the
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/// lto_module_t is no longer valid.
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void lto_module_dispose(lto_module_t mod) {
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delete mod;
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}
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/// lto_module_get_target_triple - Returns triplet string which the object
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/// module was compiled under.
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const char* lto_module_get_target_triple(lto_module_t mod) {
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return mod->getTargetTriple();
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}
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/// lto_module_set_target_triple - Sets triple string with which the object will
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/// be codegened.
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void lto_module_set_target_triple(lto_module_t mod, const char *triple) {
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return mod->setTargetTriple(triple);
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}
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/// lto_module_get_num_symbols - Returns the number of symbols in the object
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/// module.
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unsigned int lto_module_get_num_symbols(lto_module_t mod) {
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return mod->getSymbolCount();
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}
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/// lto_module_get_symbol_name - Returns the name of the ith symbol in the
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/// object module.
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const char* lto_module_get_symbol_name(lto_module_t mod, unsigned int index) {
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return mod->getSymbolName(index);
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}
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/// lto_module_get_symbol_attribute - Returns the attributes of the ith symbol
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/// in the object module.
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lto_symbol_attributes lto_module_get_symbol_attribute(lto_module_t mod,
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unsigned int index) {
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return mod->getSymbolAttributes(index);
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}
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/// lto_codegen_create - Instantiates a code generator. Returns NULL if there
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/// is an error.
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lto_code_gen_t lto_codegen_create(void) {
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return new LTOCodeGenerator();
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}
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/// lto_codegen_dispose - Frees all memory for a code generator. Upon return the
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/// lto_code_gen_t is no longer valid.
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void lto_codegen_dispose(lto_code_gen_t cg) {
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delete cg;
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}
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/// lto_codegen_add_module - Add an object module to the set of modules for
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/// which code will be generated. Returns true on error (check
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/// lto_get_error_message() for details).
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bool lto_codegen_add_module(lto_code_gen_t cg, lto_module_t mod) {
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return cg->addModule(mod, sLastErrorString);
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}
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/// lto_codegen_set_debug_model - Sets what if any format of debug info should
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/// be generated. Returns true on error (check lto_get_error_message() for
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/// details).
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bool lto_codegen_set_debug_model(lto_code_gen_t cg, lto_debug_model debug) {
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return cg->setDebugInfo(debug, sLastErrorString);
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}
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/// lto_codegen_set_pic_model - Sets what code model to generated. Returns true
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/// on error (check lto_get_error_message() for details).
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bool lto_codegen_set_pic_model(lto_code_gen_t cg, lto_codegen_model model) {
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return cg->setCodePICModel(model, sLastErrorString);
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}
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/// lto_codegen_set_cpu - Sets the cpu to generate code for.
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void lto_codegen_set_cpu(lto_code_gen_t cg, const char *cpu) {
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return cg->setCpu(cpu);
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}
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/// lto_codegen_set_assembler_path - Sets the path to the assembler tool.
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void lto_codegen_set_assembler_path(lto_code_gen_t cg, const char *path) {
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// In here only for backwards compatibility. We use MC now.
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}
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/// lto_codegen_set_assembler_args - Sets extra arguments that libLTO should
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/// pass to the assembler.
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void lto_codegen_set_assembler_args(lto_code_gen_t cg, const char **args,
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int nargs) {
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// In here only for backwards compatibility. We use MC now.
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}
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/// lto_codegen_add_must_preserve_symbol - Adds to a list of all global symbols
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/// that must exist in the final generated code. If a function is not listed
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/// there, it might be inlined into every usage and optimized away.
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void lto_codegen_add_must_preserve_symbol(lto_code_gen_t cg,
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const char *symbol) {
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cg->addMustPreserveSymbol(symbol);
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}
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/// lto_codegen_write_merged_modules - Writes a new file at the specified path
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/// that contains the merged contents of all modules added so far. Returns true
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/// on error (check lto_get_error_message() for details).
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bool lto_codegen_write_merged_modules(lto_code_gen_t cg, const char *path) {
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return cg->writeMergedModules(path, sLastErrorString);
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}
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/// lto_codegen_compile - Generates code for all added modules into one native
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/// object file. On success returns a pointer to a generated mach-o/ELF buffer
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/// and length set to the buffer size. The buffer is owned by the lto_code_gen_t
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/// object and will be freed when lto_codegen_dispose() is called, or
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/// lto_codegen_compile() is called again. On failure, returns NULL (check
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/// lto_get_error_message() for details).
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const void *lto_codegen_compile(lto_code_gen_t cg, size_t *length) {
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return cg->compile(length, sLastErrorString);
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}
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/// lto_codegen_compile_to_file - Generates code for all added modules into one
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/// native object file. The name of the file is written to name. Returns true on
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/// error.
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bool lto_codegen_compile_to_file(lto_code_gen_t cg, const char **name) {
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return cg->compile_to_file(name, sLastErrorString);
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}
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/// lto_codegen_debug_options - Used to pass extra options to the code
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/// generator.
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void lto_codegen_debug_options(lto_code_gen_t cg, const char *opt) {
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cg->setCodeGenDebugOptions(opt);
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}
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