mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-25 00:29:20 +00:00
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@234958 91177308-0d34-0410-b5e6-96231b3b80d8
933 lines
28 KiB
C++
933 lines
28 KiB
C++
//===-- gold-plugin.cpp - Plugin to gold for Link Time Optimization ------===//
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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 is a gold plugin for LLVM. It provides an LLVM implementation of the
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// interface described in http://gcc.gnu.org/wiki/whopr/driver .
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Config/config.h" // plugin-api.h requires HAVE_STDINT_H
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#include "llvm/ADT/DenseSet.h"
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#include "llvm/ADT/StringSet.h"
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#include "llvm/Analysis/TargetLibraryInfo.h"
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#include "llvm/Analysis/TargetTransformInfo.h"
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#include "llvm/Bitcode/ReaderWriter.h"
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#include "llvm/CodeGen/Analysis.h"
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#include "llvm/CodeGen/CommandFlags.h"
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#include "llvm/IR/AutoUpgrade.h"
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#include "llvm/IR/Constants.h"
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#include "llvm/IR/DiagnosticInfo.h"
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#include "llvm/IR/DiagnosticPrinter.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/LegacyPassManager.h"
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#include "llvm/IR/Module.h"
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#include "llvm/IR/Verifier.h"
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#include "llvm/Linker/Linker.h"
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#include "llvm/MC/SubtargetFeature.h"
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#include "llvm/Object/IRObjectFile.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Support/Host.h"
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#include "llvm/Support/ManagedStatic.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/TargetRegistry.h"
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#include "llvm/Support/TargetSelect.h"
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#include "llvm/Transforms/IPO.h"
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#include "llvm/Transforms/IPO/PassManagerBuilder.h"
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#include "llvm/Transforms/Utils/GlobalStatus.h"
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#include "llvm/Transforms/Utils/ModuleUtils.h"
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#include "llvm/Transforms/Utils/ValueMapper.h"
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#include <list>
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#include <plugin-api.h>
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#include <system_error>
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#include <vector>
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#ifndef LDPO_PIE
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// FIXME: remove this declaration when we stop maintaining Ubuntu Quantal and
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// Precise and Debian Wheezy (binutils 2.23 is required)
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# define LDPO_PIE 3
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#endif
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using namespace llvm;
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namespace {
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struct claimed_file {
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void *handle;
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std::vector<ld_plugin_symbol> syms;
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};
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}
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static ld_plugin_status discard_message(int level, const char *format, ...) {
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// Die loudly. Recent versions of Gold pass ld_plugin_message as the first
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// callback in the transfer vector. This should never be called.
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abort();
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}
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static ld_plugin_get_input_file get_input_file = nullptr;
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static ld_plugin_release_input_file release_input_file = nullptr;
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static ld_plugin_add_symbols add_symbols = nullptr;
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static ld_plugin_get_symbols get_symbols = nullptr;
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static ld_plugin_add_input_file add_input_file = nullptr;
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static ld_plugin_set_extra_library_path set_extra_library_path = nullptr;
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static ld_plugin_get_view get_view = nullptr;
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static ld_plugin_message message = discard_message;
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static Reloc::Model RelocationModel = Reloc::Default;
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static std::string output_name = "";
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static std::list<claimed_file> Modules;
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static std::vector<std::string> Cleanup;
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static llvm::TargetOptions TargetOpts;
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namespace options {
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enum OutputType {
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OT_NORMAL,
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OT_DISABLE,
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OT_BC_ONLY,
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OT_SAVE_TEMPS
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};
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static bool generate_api_file = false;
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static OutputType TheOutputType = OT_NORMAL;
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static unsigned OptLevel = 2;
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static std::string obj_path;
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static std::string extra_library_path;
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static std::string triple;
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static std::string mcpu;
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// Additional options to pass into the code generator.
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// Note: This array will contain all plugin options which are not claimed
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// as plugin exclusive to pass to the code generator.
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// For example, "generate-api-file" and "as"options are for the plugin
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// use only and will not be passed.
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static std::vector<const char *> extra;
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static void process_plugin_option(const char* opt_)
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{
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if (opt_ == nullptr)
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return;
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llvm::StringRef opt = opt_;
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if (opt == "generate-api-file") {
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generate_api_file = true;
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} else if (opt.startswith("mcpu=")) {
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mcpu = opt.substr(strlen("mcpu="));
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} else if (opt.startswith("extra-library-path=")) {
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extra_library_path = opt.substr(strlen("extra_library_path="));
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} else if (opt.startswith("mtriple=")) {
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triple = opt.substr(strlen("mtriple="));
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} else if (opt.startswith("obj-path=")) {
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obj_path = opt.substr(strlen("obj-path="));
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} else if (opt == "emit-llvm") {
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TheOutputType = OT_BC_ONLY;
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} else if (opt == "save-temps") {
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TheOutputType = OT_SAVE_TEMPS;
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} else if (opt == "disable-output") {
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TheOutputType = OT_DISABLE;
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} else if (opt.size() == 2 && opt[0] == 'O') {
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if (opt[1] < '0' || opt[1] > '3')
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report_fatal_error("Optimization level must be between 0 and 3");
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OptLevel = opt[1] - '0';
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} else {
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// Save this option to pass to the code generator.
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// ParseCommandLineOptions() expects argv[0] to be program name. Lazily
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// add that.
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if (extra.empty())
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extra.push_back("LLVMgold");
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extra.push_back(opt_);
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}
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}
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}
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static ld_plugin_status claim_file_hook(const ld_plugin_input_file *file,
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int *claimed);
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static ld_plugin_status all_symbols_read_hook(void);
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static ld_plugin_status cleanup_hook(void);
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extern "C" ld_plugin_status onload(ld_plugin_tv *tv);
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ld_plugin_status onload(ld_plugin_tv *tv) {
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InitializeAllTargetInfos();
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InitializeAllTargets();
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InitializeAllTargetMCs();
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InitializeAllAsmParsers();
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InitializeAllAsmPrinters();
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// We're given a pointer to the first transfer vector. We read through them
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// until we find one where tv_tag == LDPT_NULL. The REGISTER_* tagged values
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// contain pointers to functions that we need to call to register our own
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// hooks. The others are addresses of functions we can use to call into gold
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// for services.
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bool registeredClaimFile = false;
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bool RegisteredAllSymbolsRead = false;
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for (; tv->tv_tag != LDPT_NULL; ++tv) {
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switch (tv->tv_tag) {
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case LDPT_OUTPUT_NAME:
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output_name = tv->tv_u.tv_string;
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break;
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case LDPT_LINKER_OUTPUT:
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switch (tv->tv_u.tv_val) {
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case LDPO_REL: // .o
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case LDPO_DYN: // .so
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case LDPO_PIE: // position independent executable
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RelocationModel = Reloc::PIC_;
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break;
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case LDPO_EXEC: // .exe
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RelocationModel = Reloc::Static;
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break;
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default:
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message(LDPL_ERROR, "Unknown output file type %d", tv->tv_u.tv_val);
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return LDPS_ERR;
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}
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break;
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case LDPT_OPTION:
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options::process_plugin_option(tv->tv_u.tv_string);
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break;
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case LDPT_REGISTER_CLAIM_FILE_HOOK: {
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ld_plugin_register_claim_file callback;
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callback = tv->tv_u.tv_register_claim_file;
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if (callback(claim_file_hook) != LDPS_OK)
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return LDPS_ERR;
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registeredClaimFile = true;
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} break;
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case LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK: {
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ld_plugin_register_all_symbols_read callback;
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callback = tv->tv_u.tv_register_all_symbols_read;
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if (callback(all_symbols_read_hook) != LDPS_OK)
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return LDPS_ERR;
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RegisteredAllSymbolsRead = true;
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} break;
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case LDPT_REGISTER_CLEANUP_HOOK: {
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ld_plugin_register_cleanup callback;
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callback = tv->tv_u.tv_register_cleanup;
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if (callback(cleanup_hook) != LDPS_OK)
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return LDPS_ERR;
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} break;
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case LDPT_GET_INPUT_FILE:
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get_input_file = tv->tv_u.tv_get_input_file;
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break;
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case LDPT_RELEASE_INPUT_FILE:
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release_input_file = tv->tv_u.tv_release_input_file;
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break;
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case LDPT_ADD_SYMBOLS:
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add_symbols = tv->tv_u.tv_add_symbols;
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break;
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case LDPT_GET_SYMBOLS_V2:
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get_symbols = tv->tv_u.tv_get_symbols;
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break;
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case LDPT_ADD_INPUT_FILE:
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add_input_file = tv->tv_u.tv_add_input_file;
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break;
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case LDPT_SET_EXTRA_LIBRARY_PATH:
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set_extra_library_path = tv->tv_u.tv_set_extra_library_path;
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break;
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case LDPT_GET_VIEW:
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get_view = tv->tv_u.tv_get_view;
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break;
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case LDPT_MESSAGE:
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message = tv->tv_u.tv_message;
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break;
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default:
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break;
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}
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}
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if (!registeredClaimFile) {
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message(LDPL_ERROR, "register_claim_file not passed to LLVMgold.");
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return LDPS_ERR;
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}
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if (!add_symbols) {
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message(LDPL_ERROR, "add_symbols not passed to LLVMgold.");
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return LDPS_ERR;
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}
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if (!RegisteredAllSymbolsRead)
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return LDPS_OK;
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if (!get_input_file) {
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message(LDPL_ERROR, "get_input_file not passed to LLVMgold.");
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return LDPS_ERR;
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}
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if (!release_input_file) {
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message(LDPL_ERROR, "relesase_input_file not passed to LLVMgold.");
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return LDPS_ERR;
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}
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return LDPS_OK;
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}
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static const GlobalObject *getBaseObject(const GlobalValue &GV) {
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if (auto *GA = dyn_cast<GlobalAlias>(&GV))
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return GA->getBaseObject();
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return cast<GlobalObject>(&GV);
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}
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static bool shouldSkip(uint32_t Symflags) {
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if (!(Symflags & object::BasicSymbolRef::SF_Global))
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return true;
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if (Symflags & object::BasicSymbolRef::SF_FormatSpecific)
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return true;
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return false;
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}
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static void diagnosticHandler(const DiagnosticInfo &DI, void *Context) {
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if (const auto *BDI = dyn_cast<BitcodeDiagnosticInfo>(&DI)) {
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std::error_code EC = BDI->getError();
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if (EC == BitcodeError::InvalidBitcodeSignature)
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return;
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}
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std::string ErrStorage;
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{
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raw_string_ostream OS(ErrStorage);
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DiagnosticPrinterRawOStream DP(OS);
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DI.print(DP);
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}
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ld_plugin_level Level;
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switch (DI.getSeverity()) {
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case DS_Error:
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message(LDPL_FATAL, "LLVM gold plugin has failed to create LTO module: %s",
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ErrStorage.c_str());
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llvm_unreachable("Fatal doesn't return.");
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case DS_Warning:
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Level = LDPL_WARNING;
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break;
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case DS_Note:
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case DS_Remark:
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Level = LDPL_INFO;
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break;
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}
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message(Level, "LLVM gold plugin: %s", ErrStorage.c_str());
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}
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/// Called by gold to see whether this file is one that our plugin can handle.
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/// We'll try to open it and register all the symbols with add_symbol if
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/// possible.
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static ld_plugin_status claim_file_hook(const ld_plugin_input_file *file,
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int *claimed) {
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LLVMContext Context;
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MemoryBufferRef BufferRef;
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std::unique_ptr<MemoryBuffer> Buffer;
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if (get_view) {
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const void *view;
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if (get_view(file->handle, &view) != LDPS_OK) {
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message(LDPL_ERROR, "Failed to get a view of %s", file->name);
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return LDPS_ERR;
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}
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BufferRef = MemoryBufferRef(StringRef((const char *)view, file->filesize), "");
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} else {
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int64_t offset = 0;
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// Gold has found what might be IR part-way inside of a file, such as
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// an .a archive.
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if (file->offset) {
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offset = file->offset;
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}
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ErrorOr<std::unique_ptr<MemoryBuffer>> BufferOrErr =
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MemoryBuffer::getOpenFileSlice(file->fd, file->name, file->filesize,
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offset);
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if (std::error_code EC = BufferOrErr.getError()) {
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message(LDPL_ERROR, EC.message().c_str());
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return LDPS_ERR;
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}
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Buffer = std::move(BufferOrErr.get());
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BufferRef = Buffer->getMemBufferRef();
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}
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Context.setDiagnosticHandler(diagnosticHandler);
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ErrorOr<std::unique_ptr<object::IRObjectFile>> ObjOrErr =
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object::IRObjectFile::create(BufferRef, Context);
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std::error_code EC = ObjOrErr.getError();
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if (EC == object::object_error::invalid_file_type ||
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EC == object::object_error::bitcode_section_not_found)
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return LDPS_OK;
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*claimed = 1;
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if (EC) {
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message(LDPL_ERROR, "LLVM gold plugin has failed to create LTO module: %s",
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EC.message().c_str());
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return LDPS_ERR;
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}
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std::unique_ptr<object::IRObjectFile> Obj = std::move(*ObjOrErr);
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Modules.resize(Modules.size() + 1);
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claimed_file &cf = Modules.back();
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cf.handle = file->handle;
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for (auto &Sym : Obj->symbols()) {
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uint32_t Symflags = Sym.getFlags();
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if (shouldSkip(Symflags))
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continue;
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cf.syms.push_back(ld_plugin_symbol());
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ld_plugin_symbol &sym = cf.syms.back();
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sym.version = nullptr;
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SmallString<64> Name;
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{
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raw_svector_ostream OS(Name);
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Sym.printName(OS);
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}
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sym.name = strdup(Name.c_str());
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const GlobalValue *GV = Obj->getSymbolGV(Sym.getRawDataRefImpl());
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sym.visibility = LDPV_DEFAULT;
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if (GV) {
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switch (GV->getVisibility()) {
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case GlobalValue::DefaultVisibility:
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sym.visibility = LDPV_DEFAULT;
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break;
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case GlobalValue::HiddenVisibility:
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sym.visibility = LDPV_HIDDEN;
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break;
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case GlobalValue::ProtectedVisibility:
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sym.visibility = LDPV_PROTECTED;
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break;
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}
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}
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if (Symflags & object::BasicSymbolRef::SF_Undefined) {
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sym.def = LDPK_UNDEF;
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if (GV && GV->hasExternalWeakLinkage())
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sym.def = LDPK_WEAKUNDEF;
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} else {
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sym.def = LDPK_DEF;
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if (GV) {
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assert(!GV->hasExternalWeakLinkage() &&
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!GV->hasAvailableExternallyLinkage() && "Not a declaration!");
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if (GV->hasCommonLinkage())
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sym.def = LDPK_COMMON;
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else if (GV->isWeakForLinker())
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sym.def = LDPK_WEAKDEF;
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}
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}
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sym.size = 0;
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sym.comdat_key = nullptr;
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if (GV) {
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const GlobalObject *Base = getBaseObject(*GV);
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if (!Base)
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message(LDPL_FATAL, "Unable to determine comdat of alias!");
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const Comdat *C = Base->getComdat();
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if (C)
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sym.comdat_key = strdup(C->getName().str().c_str());
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else if (Base->hasWeakLinkage() || Base->hasLinkOnceLinkage())
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sym.comdat_key = strdup(sym.name);
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}
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sym.resolution = LDPR_UNKNOWN;
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}
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if (!cf.syms.empty()) {
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if (add_symbols(cf.handle, cf.syms.size(), &cf.syms[0]) != LDPS_OK) {
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message(LDPL_ERROR, "Unable to add symbols!");
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return LDPS_ERR;
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}
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}
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return LDPS_OK;
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}
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static void keepGlobalValue(GlobalValue &GV,
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std::vector<GlobalAlias *> &KeptAliases) {
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assert(!GV.hasLocalLinkage());
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if (auto *GA = dyn_cast<GlobalAlias>(&GV))
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KeptAliases.push_back(GA);
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switch (GV.getLinkage()) {
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default:
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break;
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case GlobalValue::LinkOnceAnyLinkage:
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GV.setLinkage(GlobalValue::WeakAnyLinkage);
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break;
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case GlobalValue::LinkOnceODRLinkage:
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GV.setLinkage(GlobalValue::WeakODRLinkage);
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break;
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}
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assert(!GV.isDiscardableIfUnused());
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}
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static void internalize(GlobalValue &GV) {
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if (GV.isDeclarationForLinker())
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return; // We get here if there is a matching asm definition.
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if (!GV.hasLocalLinkage())
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GV.setLinkage(GlobalValue::InternalLinkage);
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}
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static void drop(GlobalValue &GV) {
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if (auto *F = dyn_cast<Function>(&GV)) {
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F->deleteBody();
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F->setComdat(nullptr); // Should deleteBody do this?
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return;
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}
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if (auto *Var = dyn_cast<GlobalVariable>(&GV)) {
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Var->setInitializer(nullptr);
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Var->setLinkage(
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GlobalValue::ExternalLinkage); // Should setInitializer do this?
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Var->setComdat(nullptr); // and this?
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return;
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}
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auto &Alias = cast<GlobalAlias>(GV);
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Module &M = *Alias.getParent();
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PointerType &Ty = *cast<PointerType>(Alias.getType());
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GlobalValue::LinkageTypes L = Alias.getLinkage();
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auto *Var =
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new GlobalVariable(M, Ty.getElementType(), /*isConstant*/ false, L,
|
|
/*Initializer*/ nullptr);
|
|
Var->takeName(&Alias);
|
|
Alias.replaceAllUsesWith(Var);
|
|
Alias.eraseFromParent();
|
|
}
|
|
|
|
static const char *getResolutionName(ld_plugin_symbol_resolution R) {
|
|
switch (R) {
|
|
case LDPR_UNKNOWN:
|
|
return "UNKNOWN";
|
|
case LDPR_UNDEF:
|
|
return "UNDEF";
|
|
case LDPR_PREVAILING_DEF:
|
|
return "PREVAILING_DEF";
|
|
case LDPR_PREVAILING_DEF_IRONLY:
|
|
return "PREVAILING_DEF_IRONLY";
|
|
case LDPR_PREEMPTED_REG:
|
|
return "PREEMPTED_REG";
|
|
case LDPR_PREEMPTED_IR:
|
|
return "PREEMPTED_IR";
|
|
case LDPR_RESOLVED_IR:
|
|
return "RESOLVED_IR";
|
|
case LDPR_RESOLVED_EXEC:
|
|
return "RESOLVED_EXEC";
|
|
case LDPR_RESOLVED_DYN:
|
|
return "RESOLVED_DYN";
|
|
case LDPR_PREVAILING_DEF_IRONLY_EXP:
|
|
return "PREVAILING_DEF_IRONLY_EXP";
|
|
}
|
|
llvm_unreachable("Unknown resolution");
|
|
}
|
|
|
|
namespace {
|
|
class LocalValueMaterializer : public ValueMaterializer {
|
|
DenseSet<GlobalValue *> &Dropped;
|
|
DenseMap<GlobalObject *, GlobalObject *> LocalVersions;
|
|
|
|
public:
|
|
LocalValueMaterializer(DenseSet<GlobalValue *> &Dropped) : Dropped(Dropped) {}
|
|
Value *materializeValueFor(Value *V) override;
|
|
};
|
|
}
|
|
|
|
Value *LocalValueMaterializer::materializeValueFor(Value *V) {
|
|
auto *GO = dyn_cast<GlobalObject>(V);
|
|
if (!GO)
|
|
return nullptr;
|
|
|
|
auto I = LocalVersions.find(GO);
|
|
if (I != LocalVersions.end())
|
|
return I->second;
|
|
|
|
if (!Dropped.count(GO))
|
|
return nullptr;
|
|
|
|
Module &M = *GO->getParent();
|
|
GlobalValue::LinkageTypes L = GO->getLinkage();
|
|
GlobalObject *Declaration;
|
|
if (auto *F = dyn_cast<Function>(GO)) {
|
|
Declaration = Function::Create(F->getFunctionType(), L, "", &M);
|
|
} else {
|
|
auto *Var = cast<GlobalVariable>(GO);
|
|
Declaration = new GlobalVariable(M, Var->getType()->getElementType(),
|
|
Var->isConstant(), L,
|
|
/*Initializer*/ nullptr);
|
|
}
|
|
Declaration->takeName(GO);
|
|
Declaration->copyAttributesFrom(GO);
|
|
|
|
GO->setLinkage(GlobalValue::InternalLinkage);
|
|
GO->setName(Declaration->getName());
|
|
Dropped.erase(GO);
|
|
GO->replaceAllUsesWith(Declaration);
|
|
|
|
LocalVersions[Declaration] = GO;
|
|
|
|
return GO;
|
|
}
|
|
|
|
static Constant *mapConstantToLocalCopy(Constant *C, ValueToValueMapTy &VM,
|
|
LocalValueMaterializer *Materializer) {
|
|
return MapValue(C, VM, RF_IgnoreMissingEntries, nullptr, Materializer);
|
|
}
|
|
|
|
static void freeSymName(ld_plugin_symbol &Sym) {
|
|
free(Sym.name);
|
|
free(Sym.comdat_key);
|
|
Sym.name = nullptr;
|
|
Sym.comdat_key = nullptr;
|
|
}
|
|
|
|
static std::unique_ptr<Module>
|
|
getModuleForFile(LLVMContext &Context, claimed_file &F,
|
|
ld_plugin_input_file &Info, raw_fd_ostream *ApiFile,
|
|
StringSet<> &Internalize, StringSet<> &Maybe) {
|
|
|
|
if (get_symbols(F.handle, F.syms.size(), &F.syms[0]) != LDPS_OK)
|
|
message(LDPL_FATAL, "Failed to get symbol information");
|
|
|
|
const void *View;
|
|
if (get_view(F.handle, &View) != LDPS_OK)
|
|
message(LDPL_FATAL, "Failed to get a view of file");
|
|
|
|
MemoryBufferRef BufferRef(StringRef((const char *)View, Info.filesize),
|
|
Info.name);
|
|
ErrorOr<std::unique_ptr<object::IRObjectFile>> ObjOrErr =
|
|
object::IRObjectFile::create(BufferRef, Context);
|
|
|
|
if (std::error_code EC = ObjOrErr.getError())
|
|
message(LDPL_FATAL, "Could not read bitcode from file : %s",
|
|
EC.message().c_str());
|
|
|
|
object::IRObjectFile &Obj = **ObjOrErr;
|
|
|
|
Module &M = Obj.getModule();
|
|
|
|
M.materializeMetadata();
|
|
UpgradeDebugInfo(M);
|
|
|
|
SmallPtrSet<GlobalValue *, 8> Used;
|
|
collectUsedGlobalVariables(M, Used, /*CompilerUsed*/ false);
|
|
|
|
DenseSet<GlobalValue *> Drop;
|
|
std::vector<GlobalAlias *> KeptAliases;
|
|
|
|
unsigned SymNum = 0;
|
|
for (auto &ObjSym : Obj.symbols()) {
|
|
if (shouldSkip(ObjSym.getFlags()))
|
|
continue;
|
|
ld_plugin_symbol &Sym = F.syms[SymNum];
|
|
++SymNum;
|
|
|
|
ld_plugin_symbol_resolution Resolution =
|
|
(ld_plugin_symbol_resolution)Sym.resolution;
|
|
|
|
if (options::generate_api_file)
|
|
*ApiFile << Sym.name << ' ' << getResolutionName(Resolution) << '\n';
|
|
|
|
GlobalValue *GV = Obj.getSymbolGV(ObjSym.getRawDataRefImpl());
|
|
if (!GV) {
|
|
freeSymName(Sym);
|
|
continue; // Asm symbol.
|
|
}
|
|
|
|
if (Resolution != LDPR_PREVAILING_DEF_IRONLY && GV->hasCommonLinkage()) {
|
|
// Common linkage is special. There is no single symbol that wins the
|
|
// resolution. Instead we have to collect the maximum alignment and size.
|
|
// The IR linker does that for us if we just pass it every common GV.
|
|
// We still have to keep track of LDPR_PREVAILING_DEF_IRONLY so we
|
|
// internalize once the IR linker has done its job.
|
|
freeSymName(Sym);
|
|
continue;
|
|
}
|
|
|
|
switch (Resolution) {
|
|
case LDPR_UNKNOWN:
|
|
llvm_unreachable("Unexpected resolution");
|
|
|
|
case LDPR_RESOLVED_IR:
|
|
case LDPR_RESOLVED_EXEC:
|
|
case LDPR_RESOLVED_DYN:
|
|
assert(GV->isDeclarationForLinker());
|
|
break;
|
|
|
|
case LDPR_UNDEF:
|
|
if (!GV->isDeclarationForLinker()) {
|
|
assert(GV->hasComdat());
|
|
Drop.insert(GV);
|
|
}
|
|
break;
|
|
|
|
case LDPR_PREVAILING_DEF_IRONLY: {
|
|
keepGlobalValue(*GV, KeptAliases);
|
|
if (!Used.count(GV)) {
|
|
// Since we use the regular lib/Linker, we cannot just internalize GV
|
|
// now or it will not be copied to the merged module. Instead we force
|
|
// it to be copied and then internalize it.
|
|
Internalize.insert(GV->getName());
|
|
}
|
|
break;
|
|
}
|
|
|
|
case LDPR_PREVAILING_DEF:
|
|
keepGlobalValue(*GV, KeptAliases);
|
|
break;
|
|
|
|
case LDPR_PREEMPTED_IR:
|
|
// Gold might have selected a linkonce_odr and preempted a weak_odr.
|
|
// In that case we have to make sure we don't end up internalizing it.
|
|
if (!GV->isDiscardableIfUnused())
|
|
Maybe.erase(GV->getName());
|
|
|
|
// fall-through
|
|
case LDPR_PREEMPTED_REG:
|
|
Drop.insert(GV);
|
|
break;
|
|
|
|
case LDPR_PREVAILING_DEF_IRONLY_EXP: {
|
|
// We can only check for address uses after we merge the modules. The
|
|
// reason is that this GV might have a copy in another module
|
|
// and in that module the address might be significant, but that
|
|
// copy will be LDPR_PREEMPTED_IR.
|
|
if (GV->hasLinkOnceODRLinkage())
|
|
Maybe.insert(GV->getName());
|
|
keepGlobalValue(*GV, KeptAliases);
|
|
break;
|
|
}
|
|
}
|
|
|
|
freeSymName(Sym);
|
|
}
|
|
|
|
ValueToValueMapTy VM;
|
|
LocalValueMaterializer Materializer(Drop);
|
|
for (GlobalAlias *GA : KeptAliases) {
|
|
// Gold told us to keep GA. It is possible that a GV usied in the aliasee
|
|
// expression is being dropped. If that is the case, that GV must be copied.
|
|
Constant *Aliasee = GA->getAliasee();
|
|
Constant *Replacement = mapConstantToLocalCopy(Aliasee, VM, &Materializer);
|
|
GA->setAliasee(Replacement);
|
|
}
|
|
|
|
for (auto *GV : Drop)
|
|
drop(*GV);
|
|
|
|
return Obj.takeModule();
|
|
}
|
|
|
|
static void runLTOPasses(Module &M, TargetMachine &TM) {
|
|
if (const DataLayout *DL = TM.getDataLayout())
|
|
M.setDataLayout(*DL);
|
|
|
|
legacy::PassManager passes;
|
|
passes.add(createTargetTransformInfoWrapperPass(TM.getTargetIRAnalysis()));
|
|
|
|
PassManagerBuilder PMB;
|
|
PMB.LibraryInfo = new TargetLibraryInfoImpl(Triple(TM.getTargetTriple()));
|
|
PMB.Inliner = createFunctionInliningPass();
|
|
PMB.VerifyInput = true;
|
|
PMB.VerifyOutput = true;
|
|
PMB.LoopVectorize = true;
|
|
PMB.SLPVectorize = true;
|
|
PMB.OptLevel = options::OptLevel;
|
|
PMB.populateLTOPassManager(passes);
|
|
passes.run(M);
|
|
}
|
|
|
|
static void saveBCFile(StringRef Path, Module &M) {
|
|
std::error_code EC;
|
|
raw_fd_ostream OS(Path, EC, sys::fs::OpenFlags::F_None);
|
|
if (EC)
|
|
message(LDPL_FATAL, "Failed to write the output file.");
|
|
WriteBitcodeToFile(&M, OS, /* ShouldPreserveUseListOrder */ true);
|
|
}
|
|
|
|
static void codegen(Module &M) {
|
|
const std::string &TripleStr = M.getTargetTriple();
|
|
Triple TheTriple(TripleStr);
|
|
|
|
std::string ErrMsg;
|
|
const Target *TheTarget = TargetRegistry::lookupTarget(TripleStr, ErrMsg);
|
|
if (!TheTarget)
|
|
message(LDPL_FATAL, "Target not found: %s", ErrMsg.c_str());
|
|
|
|
if (unsigned NumOpts = options::extra.size())
|
|
cl::ParseCommandLineOptions(NumOpts, &options::extra[0]);
|
|
|
|
SubtargetFeatures Features;
|
|
Features.getDefaultSubtargetFeatures(TheTriple);
|
|
for (const std::string &A : MAttrs)
|
|
Features.AddFeature(A);
|
|
|
|
TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
|
|
CodeGenOpt::Level CGOptLevel;
|
|
switch (options::OptLevel) {
|
|
case 0:
|
|
CGOptLevel = CodeGenOpt::None;
|
|
break;
|
|
case 1:
|
|
CGOptLevel = CodeGenOpt::Less;
|
|
break;
|
|
case 2:
|
|
CGOptLevel = CodeGenOpt::Default;
|
|
break;
|
|
case 3:
|
|
CGOptLevel = CodeGenOpt::Aggressive;
|
|
break;
|
|
}
|
|
std::unique_ptr<TargetMachine> TM(TheTarget->createTargetMachine(
|
|
TripleStr, options::mcpu, Features.getString(), Options, RelocationModel,
|
|
CodeModel::Default, CGOptLevel));
|
|
|
|
runLTOPasses(M, *TM);
|
|
|
|
if (options::TheOutputType == options::OT_SAVE_TEMPS)
|
|
saveBCFile(output_name + ".opt.bc", M);
|
|
|
|
legacy::PassManager CodeGenPasses;
|
|
|
|
SmallString<128> Filename;
|
|
int FD;
|
|
if (options::obj_path.empty()) {
|
|
std::error_code EC =
|
|
sys::fs::createTemporaryFile("lto-llvm", "o", FD, Filename);
|
|
if (EC)
|
|
message(LDPL_FATAL, "Could not create temporary file: %s",
|
|
EC.message().c_str());
|
|
} else {
|
|
Filename = options::obj_path;
|
|
std::error_code EC =
|
|
sys::fs::openFileForWrite(Filename.c_str(), FD, sys::fs::F_None);
|
|
if (EC)
|
|
message(LDPL_FATAL, "Could not open file: %s", EC.message().c_str());
|
|
}
|
|
|
|
{
|
|
raw_fd_ostream OS(FD, true);
|
|
|
|
if (TM->addPassesToEmitFile(CodeGenPasses, OS,
|
|
TargetMachine::CGFT_ObjectFile))
|
|
message(LDPL_FATAL, "Failed to setup codegen");
|
|
CodeGenPasses.run(M);
|
|
}
|
|
|
|
if (add_input_file(Filename.c_str()) != LDPS_OK)
|
|
message(LDPL_FATAL,
|
|
"Unable to add .o file to the link. File left behind in: %s",
|
|
Filename.c_str());
|
|
|
|
if (options::obj_path.empty())
|
|
Cleanup.push_back(Filename.c_str());
|
|
}
|
|
|
|
/// 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 allSymbolsReadHook(raw_fd_ostream *ApiFile) {
|
|
if (Modules.empty())
|
|
return LDPS_OK;
|
|
|
|
LLVMContext Context;
|
|
Context.setDiagnosticHandler(diagnosticHandler, nullptr, true);
|
|
|
|
std::unique_ptr<Module> Combined(new Module("ld-temp.o", Context));
|
|
Linker L(Combined.get());
|
|
|
|
std::string DefaultTriple = sys::getDefaultTargetTriple();
|
|
|
|
StringSet<> Internalize;
|
|
StringSet<> Maybe;
|
|
for (claimed_file &F : Modules) {
|
|
ld_plugin_input_file File;
|
|
if (get_input_file(F.handle, &File) != LDPS_OK)
|
|
message(LDPL_FATAL, "Failed to get file information");
|
|
std::unique_ptr<Module> M =
|
|
getModuleForFile(Context, F, File, ApiFile, Internalize, Maybe);
|
|
if (!options::triple.empty())
|
|
M->setTargetTriple(options::triple.c_str());
|
|
else if (M->getTargetTriple().empty()) {
|
|
M->setTargetTriple(DefaultTriple);
|
|
}
|
|
|
|
if (L.linkInModule(M.get()))
|
|
message(LDPL_FATAL, "Failed to link module");
|
|
if (release_input_file(F.handle) != LDPS_OK)
|
|
message(LDPL_FATAL, "Failed to release file information");
|
|
}
|
|
|
|
for (const auto &Name : Internalize) {
|
|
GlobalValue *GV = Combined->getNamedValue(Name.first());
|
|
if (GV)
|
|
internalize(*GV);
|
|
}
|
|
|
|
for (const auto &Name : Maybe) {
|
|
GlobalValue *GV = Combined->getNamedValue(Name.first());
|
|
if (!GV)
|
|
continue;
|
|
GV->setLinkage(GlobalValue::LinkOnceODRLinkage);
|
|
if (canBeOmittedFromSymbolTable(GV))
|
|
internalize(*GV);
|
|
}
|
|
|
|
if (options::TheOutputType == options::OT_DISABLE)
|
|
return LDPS_OK;
|
|
|
|
if (options::TheOutputType != options::OT_NORMAL) {
|
|
std::string path;
|
|
if (options::TheOutputType == options::OT_BC_ONLY)
|
|
path = output_name;
|
|
else
|
|
path = output_name + ".bc";
|
|
saveBCFile(path, *L.getModule());
|
|
if (options::TheOutputType == options::OT_BC_ONLY)
|
|
return LDPS_OK;
|
|
}
|
|
|
|
codegen(*L.getModule());
|
|
|
|
if (!options::extra_library_path.empty() &&
|
|
set_extra_library_path(options::extra_library_path.c_str()) != LDPS_OK)
|
|
message(LDPL_FATAL, "Unable to set the extra library path.");
|
|
|
|
return LDPS_OK;
|
|
}
|
|
|
|
static ld_plugin_status all_symbols_read_hook(void) {
|
|
ld_plugin_status Ret;
|
|
if (!options::generate_api_file) {
|
|
Ret = allSymbolsReadHook(nullptr);
|
|
} else {
|
|
std::error_code EC;
|
|
raw_fd_ostream ApiFile("apifile.txt", EC, sys::fs::F_None);
|
|
if (EC)
|
|
message(LDPL_FATAL, "Unable to open apifile.txt for writing: %s",
|
|
EC.message().c_str());
|
|
Ret = allSymbolsReadHook(&ApiFile);
|
|
}
|
|
|
|
llvm_shutdown();
|
|
|
|
if (options::TheOutputType == options::OT_BC_ONLY ||
|
|
options::TheOutputType == options::OT_DISABLE) {
|
|
if (options::TheOutputType == options::OT_DISABLE)
|
|
// Remove the output file here since ld.bfd creates the output file
|
|
// early.
|
|
sys::fs::remove(output_name);
|
|
exit(0);
|
|
}
|
|
|
|
return Ret;
|
|
}
|
|
|
|
static ld_plugin_status cleanup_hook(void) {
|
|
for (std::string &Name : Cleanup) {
|
|
std::error_code EC = sys::fs::remove(Name);
|
|
if (EC)
|
|
message(LDPL_ERROR, "Failed to delete '%s': %s", Name.c_str(),
|
|
EC.message().c_str());
|
|
}
|
|
|
|
return LDPS_OK;
|
|
}
|