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-rw-r--r--contrib/llvm/tools/gold/gold-plugin.cpp519
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diff --git a/contrib/llvm/tools/gold/gold-plugin.cpp b/contrib/llvm/tools/gold/gold-plugin.cpp
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--- a/contrib/llvm/tools/gold/gold-plugin.cpp
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-//===-- gold-plugin.cpp - Plugin to gold for Link Time Optimization ------===//
-//
-// The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This is a gold plugin for LLVM. It provides an LLVM implementation of the
-// interface described in http://gcc.gnu.org/wiki/whopr/driver .
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/Config/config.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 <cerrno>
-#include <cstdlib>
-#include <cstring>
-#include <fstream>
-#include <list>
-#include <vector>
-
-using namespace llvm;
-
-namespace {
- ld_plugin_status discard_message(int level, const char *format, ...) {
- // Die loudly. Recent versions of Gold pass ld_plugin_message as the first
- // callback in the transfer vector. This should never be called.
- abort();
- }
-
- ld_plugin_add_symbols add_symbols = NULL;
- ld_plugin_get_symbols get_symbols = NULL;
- 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_message message = discard_message;
-
- int api_version = 0;
- int gold_version = 0;
-
- struct claimed_file {
- lto_module_t M;
- void *handle;
- std::vector<ld_plugin_symbol> syms;
- };
-
- lto_codegen_model output_type = LTO_CODEGEN_PIC_MODEL_STATIC;
- std::string output_name = "";
- std::list<claimed_file> Modules;
- std::vector<sys::Path> Cleanup;
-}
-
-namespace options {
- enum generate_bc { BC_NO, BC_ALSO, BC_ONLY };
- 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<std::string> as_args;
- static std::vector<std::string> pass_through;
- 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.
- // For example, "generate-api-file" and "as"options are for the plugin
- // use only and will not be passed.
- static std::vector<std::string> extra;
-
- static void process_plugin_option(const char* opt_)
- {
- if (opt_ == NULL)
- return;
- llvm::StringRef opt = opt_;
-
- if (opt == "generate-api-file") {
- generate_api_file = true;
- } else if (opt.startswith("mcpu=")) {
- mcpu = opt.substr(strlen("mcpu="));
- } 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("as-arg=")) {
- llvm::StringRef item = opt.substr(strlen("as-arg="));
- as_args.push_back(item.str());
- } 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 == "emit-llvm") {
- generate_bc_file = BC_ONLY;
- } else if (opt == "also-emit-llvm") {
- generate_bc_file = BC_ALSO;
- } else if (opt.startswith("also-emit-llvm=")) {
- llvm::StringRef path = opt.substr(strlen("also-emit-llvm="));
- generate_bc_file = BC_ALSO;
- if (!bc_path.empty()) {
- (*message)(LDPL_WARNING, "Path to the output IL file specified twice. "
- "Discarding %s", opt_);
- } else {
- bc_path = path;
- }
- } else {
- // Save this option to pass to the code generator.
- extra.push_back(opt);
- }
- }
-}
-
-static ld_plugin_status claim_file_hook(const ld_plugin_input_file *file,
- int *claimed);
-static ld_plugin_status all_symbols_read_hook(void);
-static ld_plugin_status cleanup_hook(void);
-
-extern "C" ld_plugin_status onload(ld_plugin_tv *tv);
-ld_plugin_status onload(ld_plugin_tv *tv) {
- // We're given a pointer to the first transfer vector. We read through them
- // until we find one where tv_tag == LDPT_NULL. The REGISTER_* tagged values
- // contain pointers to functions that we need to call to register our own
- // hooks. The others are addresses of functions we can use to call into gold
- // for services.
-
- bool registeredClaimFile = false;
-
- for (; tv->tv_tag != LDPT_NULL; ++tv) {
- switch (tv->tv_tag) {
- case LDPT_API_VERSION:
- api_version = tv->tv_u.tv_val;
- break;
- case LDPT_GOLD_VERSION: // major * 100 + minor
- gold_version = tv->tv_u.tv_val;
- break;
- case LDPT_OUTPUT_NAME:
- output_name = tv->tv_u.tv_string;
- break;
- case LDPT_LINKER_OUTPUT:
- switch (tv->tv_u.tv_val) {
- case LDPO_REL: // .o
- case LDPO_DYN: // .so
- output_type = LTO_CODEGEN_PIC_MODEL_DYNAMIC;
- break;
- case LDPO_EXEC: // .exe
- output_type = LTO_CODEGEN_PIC_MODEL_STATIC;
- break;
- default:
- (*message)(LDPL_ERROR, "Unknown output file type %d",
- tv->tv_u.tv_val);
- return LDPS_ERR;
- }
- // TODO: add an option to disable PIC.
- //output_type = LTO_CODEGEN_PIC_MODEL_DYNAMIC_NO_PIC;
- break;
- case LDPT_OPTION:
- options::process_plugin_option(tv->tv_u.tv_string);
- break;
- case LDPT_REGISTER_CLAIM_FILE_HOOK: {
- ld_plugin_register_claim_file callback;
- callback = tv->tv_u.tv_register_claim_file;
-
- if ((*callback)(claim_file_hook) != LDPS_OK)
- return LDPS_ERR;
-
- registeredClaimFile = true;
- } break;
- case LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK: {
- ld_plugin_register_all_symbols_read callback;
- callback = tv->tv_u.tv_register_all_symbols_read;
-
- if ((*callback)(all_symbols_read_hook) != LDPS_OK)
- return LDPS_ERR;
- } break;
- case LDPT_REGISTER_CLEANUP_HOOK: {
- ld_plugin_register_cleanup callback;
- callback = tv->tv_u.tv_register_cleanup;
-
- if ((*callback)(cleanup_hook) != LDPS_OK)
- return LDPS_ERR;
- } break;
- case LDPT_ADD_SYMBOLS:
- add_symbols = tv->tv_u.tv_add_symbols;
- break;
- case LDPT_GET_SYMBOLS:
- get_symbols = tv->tv_u.tv_get_symbols;
- break;
- case LDPT_ADD_INPUT_FILE:
- add_input_file = tv->tv_u.tv_add_input_file;
- break;
- case LDPT_ADD_INPUT_LIBRARY:
- add_input_library = tv->tv_u.tv_add_input_file;
- break;
- case LDPT_SET_EXTRA_LIBRARY_PATH:
- set_extra_library_path = tv->tv_u.tv_set_extra_library_path;
- break;
- case LDPT_MESSAGE:
- message = tv->tv_u.tv_message;
- break;
- default:
- break;
- }
- }
-
- if (!registeredClaimFile) {
- (*message)(LDPL_ERROR, "register_claim_file not passed to LLVMgold.");
- return LDPS_ERR;
- }
- if (!add_symbols) {
- (*message)(LDPL_ERROR, "add_symbols not passed to LLVMgold.");
- return LDPS_ERR;
- }
-
- return LDPS_OK;
-}
-
-/// claim_file_hook - called by gold to see whether this file is one that
-/// our plugin can handle. We'll try to open it and register all the symbols
-/// 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) {
- // 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;
- }
- buf = malloc(file->filesize);
- if (!buf) {
- (*message)(LDPL_ERROR,
- "Failed to allocate buffer for archive member of size: %d\n",
- file->filesize);
- return LDPS_ERR;
- }
- if (read(file->fd, buf, file->filesize) != file->filesize) {
- (*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);
- 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(cf.M, options::triple.c_str());
-
- cf.handle = file->handle;
- unsigned sym_count = lto_module_get_num_symbols(cf.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);
- 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<char *>(lto_module_get_symbol_name(cf.M, i));
- sym.version = NULL;
-
- int scope = attrs & LTO_SYMBOL_SCOPE_MASK;
- switch (scope) {
- case LTO_SYMBOL_SCOPE_HIDDEN:
- sym.visibility = LDPV_HIDDEN;
- break;
- case LTO_SYMBOL_SCOPE_PROTECTED:
- sym.visibility = LDPV_PROTECTED;
- break;
- case 0: // extern
- case LTO_SYMBOL_SCOPE_DEFAULT:
- sym.visibility = LDPV_DEFAULT;
- break;
- default:
- (*message)(LDPL_ERROR, "Unknown scope attribute: %d", scope);
- return LDPS_ERR;
- }
-
- int definition = attrs & LTO_SYMBOL_DEFINITION_MASK;
- switch (definition) {
- case LTO_SYMBOL_DEFINITION_REGULAR:
- sym.def = LDPK_DEF;
- break;
- case LTO_SYMBOL_DEFINITION_UNDEFINED:
- sym.def = LDPK_UNDEF;
- break;
- case LTO_SYMBOL_DEFINITION_TENTATIVE:
- sym.def = LDPK_COMMON;
- break;
- case LTO_SYMBOL_DEFINITION_WEAK:
- sym.def = LDPK_WEAKDEF;
- break;
- case LTO_SYMBOL_DEFINITION_WEAKUNDEF:
- sym.def = LDPK_WEAKUNDEF;
- break;
- default:
- (*message)(LDPL_ERROR, "Unknown definition attribute: %d", definition);
- return LDPS_ERR;
- }
-
- // LLVM never emits COMDAT.
- sym.size = 0;
- sym.comdat_key = NULL;
-
- sym.resolution = LDPR_UNKNOWN;
- }
-
- cf.syms.reserve(cf.syms.size());
-
- if (!cf.syms.empty()) {
- if ((*add_symbols)(cf.handle, cf.syms.size(), &cf.syms[0]) != LDPS_OK) {
- (*message)(LDPL_ERROR, "Unable to add symbols!");
- return LDPS_ERR;
- }
- }
-
- return LDPS_OK;
-}
-
-/// all_symbols_read_hook - gold informs us that all symbols have been read.
-/// At this point, we use get_symbols to see if any of our definitions have
-/// 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<claimed_file>::iterator I = Modules.begin(),
- E = Modules.end(); I != E; ++I)
- lto_codegen_add_module(cg, I->M);
-
- std::ofstream api_file;
- if (options::generate_api_file) {
- api_file.open("apifile.txt", std::ofstream::out | std::ofstream::trunc);
- if (!api_file.is_open()) {
- (*message)(LDPL_FATAL, "Unable to open apifile.txt for writing.");
- abort();
- }
- }
-
- // 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<claimed_file>::iterator I = Modules.begin(),
- E = Modules.end(); I != E; ++I) {
- (*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;
-
- if (options::generate_api_file)
- api_file << I->syms[i].name << "\n";
- }
- }
- }
-
- 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(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());
- }
- if (!options::as_args.empty()) {
- std::vector<const char *> as_args_p;
- for (std::vector<std::string>::iterator I = options::as_args.begin(),
- E = options::as_args.end(); I != E; ++I) {
- as_args_p.push_back(I->c_str());
- }
- lto_codegen_set_assembler_args(cg, &as_args_p[0], as_args_p.size());
- }
- if (!options::mcpu.empty())
- lto_codegen_set_cpu(cg, options::mcpu.c_str());
-
- // Pass through extra options to the code generator.
- if (!options::extra.empty()) {
- for (std::vector<std::string>::iterator it = options::extra.begin();
- it != options::extra.end(); ++it) {
- lto_codegen_debug_options(cg, (*it).c_str());
- }
- }
-
-
- if (options::generate_bc_file != options::BC_NO) {
- std::string path;
- if (options::generate_bc_file == options::BC_ONLY)
- path = output_name;
- else if (!options::bc_path.empty())
- path = options::bc_path;
- else
- path = output_name + ".bc";
- bool err = lto_codegen_write_merged_modules(cg, 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<const char *>(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;
- }
- tool_output_file objFile(uniqueObjPath.c_str(), ErrMsg,
- raw_fd_ostream::F_Binary);
- if (!ErrMsg.empty()) {
- (*message)(LDPL_ERROR, "%s", ErrMsg.c_str());
- return LDPS_ERR;
- }
-
- objFile.os().write(buffer, bufsize);
- objFile.os().close();
- if (objFile.os().has_error()) {
- (*message)(LDPL_ERROR, "Error writing output file '%s'",
- uniqueObjPath.c_str());
- objFile.os().clear_error();
- return LDPS_ERR;
- }
- objFile.keep();
-
- lto_codegen_dispose(cg);
-
- if ((*add_input_file)(uniqueObjPath.c_str()) != LDPS_OK) {
- (*message)(LDPL_ERROR, "Unable to add .o file to the link.");
- (*message)(LDPL_ERROR, "File left behind in: %s", uniqueObjPath.c_str());
- return LDPS_ERR;
- }
-
- if (!options::extra_library_path.empty() &&
- set_extra_library_path(options::extra_library_path.c_str()) != LDPS_OK) {
- (*message)(LDPL_ERROR, "Unable to set the extra library path.");
- return LDPS_ERR;
- }
-
- for (std::vector<std::string>::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);
-
- 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))
- (*message)(LDPL_ERROR, "Failed to delete '%s': %s", Cleanup[i].c_str(),
- ErrMsg.c_str());
-
- return LDPS_OK;
-}
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