X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=tools%2Fgold%2Fgold-plugin.cpp;h=27fe3acd0cf17709b02a2f1142bf8b97f13a6fa4;hb=b3cabb44c32b5a3aba9b4d23aae9723d498ea7a9;hp=2d0f5bd3af3ad762590c54c1774806de29cb26c8;hpb=51370298b848f215762bd8203afa64d0e2c89581;p=oota-llvm.git diff --git a/tools/gold/gold-plugin.cpp b/tools/gold/gold-plugin.cpp index 2d0f5bd3af3..27fe3acd0cf 100644 --- a/tools/gold/gold-plugin.cpp +++ b/tools/gold/gold-plugin.cpp @@ -12,16 +12,17 @@ // //===----------------------------------------------------------------------===// -#include "llvm/Config/config.h" +#include "llvm/Config/config.h" // plugin-api.h requires HAVE_STDINT_H #include "plugin-api.h" - #include "llvm-c/lto.h" - -#include "llvm/Support/raw_ostream.h" -#include "llvm/System/Errno.h" -#include "llvm/System/Path.h" -#include "llvm/System/Program.h" - +#include "llvm/ADT/OwningPtr.h" +#include "llvm/Support/Errno.h" +#include "llvm/Support/FileSystem.h" +#include "llvm/Support/MemoryBuffer.h" +#include "llvm/Support/Path.h" +#include "llvm/Support/Program.h" +#include "llvm/Support/ToolOutputFile.h" +#include "llvm/Support/system_error.h" #include #include #include @@ -29,6 +30,13 @@ #include #include +// Support Windows/MinGW crazyness. +#ifdef _WIN32 +# include +# define lseek _lseek +# define read _read +#endif + using namespace llvm; namespace { @@ -43,13 +51,13 @@ namespace { ld_plugin_add_input_file add_input_file = NULL; ld_plugin_add_input_library add_input_library = NULL; ld_plugin_set_extra_library_path set_extra_library_path = NULL; + ld_plugin_get_view get_view = NULL; ld_plugin_message message = discard_message; int api_version = 0; int gold_version = 0; struct claimed_file { - lto_module_t M; void *handle; std::vector syms; }; @@ -57,7 +65,8 @@ namespace { lto_codegen_model output_type = LTO_CODEGEN_PIC_MODEL_STATIC; std::string output_name = ""; std::list Modules; - std::vector Cleanup; + std::vector Cleanup; + lto_code_gen_t code_gen = NULL; } namespace options { @@ -65,9 +74,10 @@ namespace options { static bool generate_api_file = false; static generate_bc generate_bc_file = BC_NO; static std::string bc_path; - static std::string as_path; - static std::vector pass_through; + static std::string obj_path; static std::string extra_library_path; + static std::string triple; + static std::string mcpu; // Additional options to pass into the code generator. // Note: This array will contain all plugin options which are not claimed // as plugin exclusive to pass to the code generator. @@ -83,18 +93,14 @@ namespace options { if (opt == "generate-api-file") { generate_api_file = true; - } else if (opt.startswith("as=")) { - if (!as_path.empty()) { - (*message)(LDPL_WARNING, "Path to as specified twice. " - "Discarding %s", opt_); - } else { - as_path = opt.substr(strlen("as=")); - } + } else if (opt.startswith("mcpu=")) { + mcpu = opt.substr(strlen("mcpu=")); } else if (opt.startswith("extra-library-path=")) { extra_library_path = opt.substr(strlen("extra_library_path=")); - } else if (opt.startswith("pass-through=")) { - llvm::StringRef item = opt.substr(strlen("pass-through=")); - pass_through.push_back(item.str()); + } else if (opt.startswith("mtriple=")) { + triple = opt.substr(strlen("mtriple=")); + } else if (opt.startswith("obj-path=")) { + obj_path = opt.substr(strlen("obj-path=")); } else if (opt == "emit-llvm") { generate_bc_file = BC_ONLY; } else if (opt == "also-emit-llvm") { @@ -145,6 +151,8 @@ ld_plugin_status onload(ld_plugin_tv *tv) { switch (tv->tv_u.tv_val) { case LDPO_REL: // .o case LDPO_DYN: // .so + // FIXME: Replace 3 with LDPO_PIE once that is in a released binutils. + case 3: // position independent executable output_type = LTO_CODEGEN_PIC_MODEL_DYNAMIC; break; case LDPO_EXEC: // .exe @@ -176,6 +184,8 @@ ld_plugin_status onload(ld_plugin_tv *tv) { if ((*callback)(all_symbols_read_hook) != LDPS_OK) return LDPS_ERR; + + code_gen = lto_codegen_create(); } break; case LDPT_REGISTER_CLEANUP_HOOK: { ld_plugin_register_cleanup callback; @@ -199,6 +209,9 @@ ld_plugin_status onload(ld_plugin_tv *tv) { case LDPT_SET_EXTRA_LIBRARY_PATH: set_extra_library_path = tv->tv_u.tv_set_extra_library_path; break; + case LDPT_GET_VIEW: + get_view = tv->tv_u.tv_get_view; + break; case LDPT_MESSAGE: message = tv->tv_u.tv_message; break; @@ -224,64 +237,64 @@ ld_plugin_status onload(ld_plugin_tv *tv) { /// with add_symbol if possible. static ld_plugin_status claim_file_hook(const ld_plugin_input_file *file, int *claimed) { - void *buf = NULL; - if (file->offset) { + lto_module_t M; + const void *view; + OwningPtr buffer; + if (get_view) { + if (get_view(file->handle, &view) != LDPS_OK) { + (*message)(LDPL_ERROR, "Failed to get a view of %s", file->name); + return LDPS_ERR; + } + } else { + int64_t offset = 0; // Gold has found what might be IR part-way inside of a file, such as // an .a archive. - if (lseek(file->fd, file->offset, SEEK_SET) == -1) { - (*message)(LDPL_ERROR, - "Failed to seek to archive member of %s at offset %d: %s\n", - file->name, - file->offset, sys::StrError(errno).c_str()); - return LDPS_ERR; + if (file->offset) { + offset = file->offset; } - buf = malloc(file->filesize); - if (!buf) { - (*message)(LDPL_ERROR, - "Failed to allocate buffer for archive member of size: %d\n", - file->filesize); + if (error_code ec = + MemoryBuffer::getOpenFile(file->fd, file->name, buffer, file->filesize, + -1, offset, false)) { + (*message)(LDPL_ERROR, ec.message().c_str()); return LDPS_ERR; } - if (read(file->fd, buf, file->filesize) != file->filesize) { + view = buffer->getBufferStart(); + } + + if (!lto_module_is_object_file_in_memory(view, file->filesize)) + return LDPS_OK; + + M = lto_module_create_from_memory(view, file->filesize); + if (!M) { + if (const char* msg = lto_get_error_message()) { (*message)(LDPL_ERROR, - "Failed to read archive member of %s at offset %d: %s\n", - file->name, - file->offset, - sys::StrError(errno).c_str()); - free(buf); + "LLVM gold plugin has failed to create LTO module: %s", + msg); return LDPS_ERR; } - if (!lto_module_is_object_file_in_memory(buf, file->filesize)) { - free(buf); - return LDPS_OK; - } - } else if (!lto_module_is_object_file(file->name)) return LDPS_OK; + } *claimed = 1; Modules.resize(Modules.size() + 1); claimed_file &cf = Modules.back(); - cf.M = buf ? lto_module_create_from_memory(buf, file->filesize) : - lto_module_create(file->name); - free(buf); - if (!cf.M) { - (*message)(LDPL_ERROR, "Failed to create LLVM module: %s", - lto_get_error_message()); - return LDPS_ERR; - } + if (!options::triple.empty()) + lto_module_set_target_triple(M, options::triple.c_str()); + cf.handle = file->handle; - unsigned sym_count = lto_module_get_num_symbols(cf.M); + unsigned sym_count = lto_module_get_num_symbols(M); cf.syms.reserve(sym_count); for (unsigned i = 0; i != sym_count; ++i) { - lto_symbol_attributes attrs = lto_module_get_symbol_attribute(cf.M, i); + lto_symbol_attributes attrs = lto_module_get_symbol_attribute(M, i); if ((attrs & LTO_SYMBOL_SCOPE_MASK) == LTO_SYMBOL_SCOPE_INTERNAL) continue; cf.syms.push_back(ld_plugin_symbol()); ld_plugin_symbol &sym = cf.syms.back(); - sym.name = const_cast(lto_module_get_symbol_name(cf.M, i)); + sym.name = const_cast(lto_module_get_symbol_name(M, i)); + sym.name = strdup(sym.name); sym.version = NULL; int scope = attrs & LTO_SYMBOL_SCOPE_MASK; @@ -302,6 +315,7 @@ static ld_plugin_status claim_file_hook(const ld_plugin_input_file *file, } int definition = attrs & LTO_SYMBOL_DEFINITION_MASK; + sym.comdat_key = NULL; switch (definition) { case LTO_SYMBOL_DEFINITION_REGULAR: sym.def = LDPK_DEF; @@ -313,6 +327,7 @@ static ld_plugin_status claim_file_hook(const ld_plugin_input_file *file, sym.def = LDPK_COMMON; break; case LTO_SYMBOL_DEFINITION_WEAK: + sym.comdat_key = sym.name; sym.def = LDPK_WEAKDEF; break; case LTO_SYMBOL_DEFINITION_WEAKUNDEF: @@ -323,9 +338,7 @@ static ld_plugin_status claim_file_hook(const ld_plugin_input_file *file, return LDPS_ERR; } - // LLVM never emits COMDAT. sym.size = 0; - sym.comdat_key = NULL; sym.resolution = LDPR_UNKNOWN; } @@ -339,6 +352,11 @@ static ld_plugin_status claim_file_hook(const ld_plugin_input_file *file, } } + if (code_gen) + lto_codegen_add_module(code_gen, M); + + lto_module_dispose(M); + return LDPS_OK; } @@ -347,13 +365,9 @@ static ld_plugin_status claim_file_hook(const ld_plugin_input_file *file, /// been overridden by a native object file. Then, perform optimization and /// codegen. static ld_plugin_status all_symbols_read_hook(void) { - lto_code_gen_t cg = lto_codegen_create(); - - for (std::list::iterator I = Modules.begin(), - E = Modules.end(); I != E; ++I) - lto_codegen_add_module(cg, I->M); - std::ofstream api_file; + assert(code_gen); + if (options::generate_api_file) { api_file.open("apifile.txt", std::ofstream::out | std::ofstream::trunc); if (!api_file.is_open()) { @@ -362,16 +376,14 @@ static ld_plugin_status all_symbols_read_hook(void) { } } - // If we don't preserve any symbols, libLTO will assume that all symbols are - // needed. Keep all symbols unless we're producing a final executable. - bool anySymbolsPreserved = false; for (std::list::iterator I = Modules.begin(), E = Modules.end(); I != E; ++I) { + if (I->syms.empty()) + continue; (*get_symbols)(I->handle, I->syms.size(), &I->syms[0]); for (unsigned i = 0, e = I->syms.size(); i != e; i++) { if (I->syms[i].resolution == LDPR_PREVAILING_DEF) { - lto_codegen_add_must_preserve_symbol(cg, I->syms[i].name); - anySymbolsPreserved = true; + lto_codegen_add_must_preserve_symbol(code_gen, I->syms[i].name); if (options::generate_api_file) api_file << I->syms[i].name << "\n"; @@ -382,27 +394,19 @@ static ld_plugin_status all_symbols_read_hook(void) { if (options::generate_api_file) api_file.close(); - if (!anySymbolsPreserved) { - // All of the IL is unnecessary! - lto_codegen_dispose(cg); - return LDPS_OK; - } + lto_codegen_set_pic_model(code_gen, output_type); + lto_codegen_set_debug_model(code_gen, LTO_DEBUG_MODEL_DWARF); + if (!options::mcpu.empty()) + lto_codegen_set_cpu(code_gen, options::mcpu.c_str()); - lto_codegen_set_pic_model(cg, output_type); - lto_codegen_set_debug_model(cg, LTO_DEBUG_MODEL_DWARF); - if (!options::as_path.empty()) { - sys::Path p = sys::Program::FindProgramByName(options::as_path); - lto_codegen_set_assembler_path(cg, p.c_str()); - } // Pass through extra options to the code generator. if (!options::extra.empty()) { for (std::vector::iterator it = options::extra.begin(); it != options::extra.end(); ++it) { - lto_codegen_debug_options(cg, (*it).c_str()); + lto_codegen_debug_options(code_gen, (*it).c_str()); } } - if (options::generate_bc_file != options::BC_NO) { std::string path; if (options::generate_bc_file == options::BC_ONLY) @@ -411,38 +415,29 @@ static ld_plugin_status all_symbols_read_hook(void) { path = options::bc_path; else path = output_name + ".bc"; - bool err = lto_codegen_write_merged_modules(cg, path.c_str()); + bool err = lto_codegen_write_merged_modules(code_gen, path.c_str()); if (err) (*message)(LDPL_FATAL, "Failed to write the output file."); if (options::generate_bc_file == options::BC_ONLY) exit(0); } - size_t bufsize = 0; - const char *buffer = static_cast(lto_codegen_compile(cg, - &bufsize)); - - std::string ErrMsg; - - sys::Path uniqueObjPath("/tmp/llvmgold.o"); - if (uniqueObjPath.createTemporaryFileOnDisk(true, &ErrMsg)) { - (*message)(LDPL_ERROR, "%s", ErrMsg.c_str()); - return LDPS_ERR; + const char *objPath; + if (lto_codegen_compile_to_file(code_gen, &objPath)) { + (*message)(LDPL_ERROR, "Could not produce a combined object file\n"); } - raw_fd_ostream objFile(uniqueObjPath.c_str(), ErrMsg, - raw_fd_ostream::F_Binary); - if (!ErrMsg.empty()) { - (*message)(LDPL_ERROR, "%s", ErrMsg.c_str()); - return LDPS_ERR; - } - - objFile.write(buffer, bufsize); - objFile.close(); - lto_codegen_dispose(cg); + lto_codegen_dispose(code_gen); + for (std::list::iterator I = Modules.begin(), + E = Modules.end(); I != E; ++I) { + for (unsigned i = 0; i != I->syms.size(); ++i) { + ld_plugin_symbol &sym = I->syms[i]; + free(sym.name); + } + } - if ((*add_input_file)(uniqueObjPath.c_str()) != LDPS_OK) { + if ((*add_input_file)(objPath) != LDPS_OK) { (*message)(LDPL_ERROR, "Unable to add .o file to the link."); - (*message)(LDPL_ERROR, "File left behind in: %s", uniqueObjPath.c_str()); + (*message)(LDPL_ERROR, "File left behind in: %s", objPath); return LDPS_ERR; } @@ -452,36 +447,19 @@ static ld_plugin_status all_symbols_read_hook(void) { return LDPS_ERR; } - for (std::vector::iterator i = options::pass_through.begin(), - e = options::pass_through.end(); - i != e; ++i) { - std::string &item = *i; - const char *item_p = item.c_str(); - if (llvm::StringRef(item).startswith("-l")) { - if (add_input_library(item_p + 2) != LDPS_OK) { - (*message)(LDPL_ERROR, "Unable to add library to the link."); - return LDPS_ERR; - } - } else { - if (add_input_file(item_p) != LDPS_OK) { - (*message)(LDPL_ERROR, "Unable to add .o file to the link."); - return LDPS_ERR; - } - } - } - - Cleanup.push_back(uniqueObjPath); + if (options::obj_path.empty()) + Cleanup.push_back(objPath); return LDPS_OK; } static ld_plugin_status cleanup_hook(void) { - std::string ErrMsg; - - for (int i = 0, e = Cleanup.size(); i != e; ++i) - if (Cleanup[i].eraseFromDisk(false, &ErrMsg)) + for (int i = 0, e = Cleanup.size(); i != e; ++i) { + error_code EC = sys::fs::remove(Cleanup[i]); + if (EC) (*message)(LDPL_ERROR, "Failed to delete '%s': %s", Cleanup[i].c_str(), - ErrMsg.c_str()); + EC.message().c_str()); + } return LDPS_OK; }