488 lines
17 KiB
C++
488 lines
17 KiB
C++
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//===-- llvm-lto2: test harness for the resolution-based LTO interface ----===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This program takes in a list of bitcode files, links them and performs
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// link-time optimization according to the provided symbol resolutions using the
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// resolution-based LTO interface, and outputs one or more object files.
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//
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// This program is intended to eventually replace llvm-lto which uses the legacy
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// LTO interface.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Bitcode/BitcodeReader.h"
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#include "llvm/CodeGen/CommandFlags.h"
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#include "llvm/Config/llvm-config.h"
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#include "llvm/IR/DiagnosticPrinter.h"
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#include "llvm/LTO/Caching.h"
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#include "llvm/LTO/LTO.h"
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#include "llvm/Passes/PassPlugin.h"
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#include "llvm/Remarks/HotnessThresholdParser.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/InitLLVM.h"
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#include "llvm/Support/PluginLoader.h"
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#include "llvm/Support/TargetSelect.h"
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#include "llvm/Support/Threading.h"
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using namespace llvm;
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using namespace lto;
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static codegen::RegisterCodeGenFlags CGF;
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static cl::opt<char>
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OptLevel("O", cl::desc("Optimization level. [-O0, -O1, -O2, or -O3] "
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"(default = '-O2')"),
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cl::Prefix, cl::ZeroOrMore, cl::init('2'));
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static cl::opt<char> CGOptLevel(
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"cg-opt-level",
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cl::desc("Codegen optimization level (0, 1, 2 or 3, default = '2')"),
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cl::init('2'));
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static cl::list<std::string> InputFilenames(cl::Positional, cl::OneOrMore,
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cl::desc("<input bitcode files>"));
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static cl::opt<std::string> OutputFilename("o", cl::Required,
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cl::desc("Output filename"),
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cl::value_desc("filename"));
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static cl::opt<std::string> CacheDir("cache-dir", cl::desc("Cache Directory"),
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cl::value_desc("directory"));
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static cl::opt<std::string> OptPipeline("opt-pipeline",
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cl::desc("Optimizer Pipeline"),
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cl::value_desc("pipeline"));
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static cl::opt<std::string> AAPipeline("aa-pipeline",
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cl::desc("Alias Analysis Pipeline"),
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cl::value_desc("aapipeline"));
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static cl::opt<bool> SaveTemps("save-temps", cl::desc("Save temporary files"));
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static cl::opt<bool>
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ThinLTODistributedIndexes("thinlto-distributed-indexes", cl::init(false),
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cl::desc("Write out individual index and "
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"import files for the "
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"distributed backend case"));
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// Default to using all available threads in the system, but using only one
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// thread per core (no SMT).
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// Use -thinlto-threads=all to use hardware_concurrency() instead, which means
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// to use all hardware threads or cores in the system.
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static cl::opt<std::string> Threads("thinlto-threads");
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static cl::list<std::string> SymbolResolutions(
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"r",
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cl::desc("Specify a symbol resolution: filename,symbolname,resolution\n"
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"where \"resolution\" is a sequence (which may be empty) of the\n"
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"following characters:\n"
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" p - prevailing: the linker has chosen this definition of the\n"
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" symbol\n"
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" l - local: the definition of this symbol is unpreemptable at\n"
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" runtime and is known to be in this linkage unit\n"
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" x - externally visible: the definition of this symbol is\n"
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" visible outside of the LTO unit\n"
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"A resolution for each symbol must be specified."),
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cl::ZeroOrMore);
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static cl::opt<std::string> OverrideTriple(
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"override-triple",
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cl::desc("Replace target triples in input files with this triple"));
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static cl::opt<std::string> DefaultTriple(
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"default-triple",
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cl::desc(
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"Replace unspecified target triples in input files with this triple"));
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static cl::opt<bool> RemarksWithHotness(
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"pass-remarks-with-hotness",
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cl::desc("With PGO, include profile count in optimization remarks"),
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cl::Hidden);
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cl::opt<Optional<uint64_t>, false, remarks::HotnessThresholdParser>
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RemarksHotnessThreshold(
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"pass-remarks-hotness-threshold",
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cl::desc("Minimum profile count required for an "
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"optimization remark to be output."
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" Use 'auto' to apply the threshold from profile summary."),
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cl::value_desc("uint or 'auto'"), cl::init(0), cl::Hidden);
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static cl::opt<std::string>
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RemarksFilename("pass-remarks-output",
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cl::desc("Output filename for pass remarks"),
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cl::value_desc("filename"));
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static cl::opt<std::string>
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RemarksPasses("pass-remarks-filter",
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cl::desc("Only record optimization remarks from passes whose "
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"names match the given regular expression"),
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cl::value_desc("regex"));
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static cl::opt<std::string> RemarksFormat(
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"pass-remarks-format",
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cl::desc("The format used for serializing remarks (default: YAML)"),
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cl::value_desc("format"), cl::init("yaml"));
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static cl::opt<std::string>
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SamplePGOFile("lto-sample-profile-file",
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cl::desc("Specify a SamplePGO profile file"));
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static cl::opt<std::string>
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CSPGOFile("lto-cspgo-profile-file",
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cl::desc("Specify a context sensitive PGO profile file"));
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static cl::opt<bool>
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RunCSIRInstr("lto-cspgo-gen",
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cl::desc("Run PGO context sensitive IR instrumentation"),
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cl::init(false), cl::Hidden);
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static cl::opt<bool>
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UseNewPM("use-new-pm",
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cl::desc("Run LTO passes using the new pass manager"),
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cl::init(LLVM_ENABLE_NEW_PASS_MANAGER), cl::Hidden);
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static cl::opt<bool>
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DebugPassManager("debug-pass-manager", cl::init(false), cl::Hidden,
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cl::desc("Print pass management debugging information"));
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static cl::opt<std::string>
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StatsFile("stats-file", cl::desc("Filename to write statistics to"));
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static cl::list<std::string>
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PassPlugins("load-pass-plugin",
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cl::desc("Load passes from plugin library"));
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static cl::opt<bool> EnableFreestanding(
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"lto-freestanding",
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cl::desc("Enable Freestanding (disable builtins / TLI) during LTO"),
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cl::init(false), cl::Hidden);
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static void check(Error E, std::string Msg) {
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if (!E)
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return;
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handleAllErrors(std::move(E), [&](ErrorInfoBase &EIB) {
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errs() << "llvm-lto2: " << Msg << ": " << EIB.message().c_str() << '\n';
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});
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exit(1);
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}
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template <typename T> static T check(Expected<T> E, std::string Msg) {
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if (E)
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return std::move(*E);
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check(E.takeError(), Msg);
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return T();
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}
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static void check(std::error_code EC, std::string Msg) {
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check(errorCodeToError(EC), Msg);
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}
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template <typename T> static T check(ErrorOr<T> E, std::string Msg) {
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if (E)
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return std::move(*E);
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check(E.getError(), Msg);
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return T();
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}
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static int usage() {
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errs() << "Available subcommands: dump-symtab run\n";
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return 1;
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}
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static int run(int argc, char **argv) {
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cl::ParseCommandLineOptions(argc, argv, "Resolution-based LTO test harness");
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// FIXME: Workaround PR30396 which means that a symbol can appear
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// more than once if it is defined in module-level assembly and
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// has a GV declaration. We allow (file, symbol) pairs to have multiple
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// resolutions and apply them in the order observed.
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std::map<std::pair<std::string, std::string>, std::list<SymbolResolution>>
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CommandLineResolutions;
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for (std::string R : SymbolResolutions) {
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StringRef Rest = R;
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StringRef FileName, SymbolName;
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std::tie(FileName, Rest) = Rest.split(',');
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if (Rest.empty()) {
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llvm::errs() << "invalid resolution: " << R << '\n';
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return 1;
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}
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std::tie(SymbolName, Rest) = Rest.split(',');
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SymbolResolution Res;
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for (char C : Rest) {
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if (C == 'p')
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Res.Prevailing = true;
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else if (C == 'l')
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Res.FinalDefinitionInLinkageUnit = true;
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else if (C == 'x')
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Res.VisibleToRegularObj = true;
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else if (C == 'r')
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Res.LinkerRedefined = true;
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else {
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llvm::errs() << "invalid character " << C << " in resolution: " << R
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<< '\n';
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return 1;
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}
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}
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CommandLineResolutions[{std::string(FileName), std::string(SymbolName)}]
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.push_back(Res);
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}
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std::vector<std::unique_ptr<MemoryBuffer>> MBs;
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Config Conf;
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Conf.DiagHandler = [](const DiagnosticInfo &DI) {
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DiagnosticPrinterRawOStream DP(errs());
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DI.print(DP);
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errs() << '\n';
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if (DI.getSeverity() == DS_Error)
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exit(1);
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};
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Conf.CPU = codegen::getMCPU();
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Conf.Options = codegen::InitTargetOptionsFromCodeGenFlags(Triple());
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Conf.MAttrs = codegen::getMAttrs();
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if (auto RM = codegen::getExplicitRelocModel())
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Conf.RelocModel = RM.getValue();
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Conf.CodeModel = codegen::getExplicitCodeModel();
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Conf.DebugPassManager = DebugPassManager;
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if (SaveTemps)
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check(Conf.addSaveTemps(OutputFilename + "."),
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"Config::addSaveTemps failed");
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// Optimization remarks.
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Conf.RemarksFilename = RemarksFilename;
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Conf.RemarksPasses = RemarksPasses;
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Conf.RemarksWithHotness = RemarksWithHotness;
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Conf.RemarksHotnessThreshold = RemarksHotnessThreshold;
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Conf.RemarksFormat = RemarksFormat;
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Conf.SampleProfile = SamplePGOFile;
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Conf.CSIRProfile = CSPGOFile;
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Conf.RunCSIRInstr = RunCSIRInstr;
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// Run a custom pipeline, if asked for.
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Conf.OptPipeline = OptPipeline;
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Conf.AAPipeline = AAPipeline;
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Conf.OptLevel = OptLevel - '0';
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Conf.UseNewPM = UseNewPM;
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Conf.Freestanding = EnableFreestanding;
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for (auto &PluginFN : PassPlugins)
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Conf.PassPlugins.push_back(PluginFN);
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switch (CGOptLevel) {
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case '0':
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Conf.CGOptLevel = CodeGenOpt::None;
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break;
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case '1':
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Conf.CGOptLevel = CodeGenOpt::Less;
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break;
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case '2':
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Conf.CGOptLevel = CodeGenOpt::Default;
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break;
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case '3':
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Conf.CGOptLevel = CodeGenOpt::Aggressive;
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break;
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default:
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llvm::errs() << "invalid cg optimization level: " << CGOptLevel << '\n';
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return 1;
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}
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if (auto FT = codegen::getExplicitFileType())
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Conf.CGFileType = FT.getValue();
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Conf.OverrideTriple = OverrideTriple;
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Conf.DefaultTriple = DefaultTriple;
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Conf.StatsFile = StatsFile;
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Conf.PTO.LoopVectorization = Conf.OptLevel > 1;
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Conf.PTO.SLPVectorization = Conf.OptLevel > 1;
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ThinBackend Backend;
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if (ThinLTODistributedIndexes)
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Backend = createWriteIndexesThinBackend(/* OldPrefix */ "",
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/* NewPrefix */ "",
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/* ShouldEmitImportsFiles */ true,
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/* LinkedObjectsFile */ nullptr,
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/* OnWrite */ {});
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else
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Backend = createInProcessThinBackend(
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llvm::heavyweight_hardware_concurrency(Threads));
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LTO Lto(std::move(Conf), std::move(Backend));
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bool HasErrors = false;
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for (std::string F : InputFilenames) {
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std::unique_ptr<MemoryBuffer> MB = check(MemoryBuffer::getFile(F), F);
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std::unique_ptr<InputFile> Input =
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check(InputFile::create(MB->getMemBufferRef()), F);
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std::vector<SymbolResolution> Res;
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for (const InputFile::Symbol &Sym : Input->symbols()) {
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auto I = CommandLineResolutions.find({F, std::string(Sym.getName())});
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// If it isn't found, look for "$", which would have been added
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// (followed by a hash) when the symbol was promoted during module
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// splitting if it was defined in one part and used in the other.
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// Try looking up the symbol name before the "$".
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if (I == CommandLineResolutions.end()) {
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auto SplitName = Sym.getName().rsplit("$");
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I = CommandLineResolutions.find({F, std::string(SplitName.first)});
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}
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if (I == CommandLineResolutions.end()) {
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llvm::errs() << argv[0] << ": missing symbol resolution for " << F
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<< ',' << Sym.getName() << '\n';
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HasErrors = true;
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} else {
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Res.push_back(I->second.front());
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I->second.pop_front();
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if (I->second.empty())
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CommandLineResolutions.erase(I);
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}
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}
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if (HasErrors)
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continue;
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MBs.push_back(std::move(MB));
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check(Lto.add(std::move(Input), Res), F);
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}
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if (!CommandLineResolutions.empty()) {
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HasErrors = true;
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for (auto UnusedRes : CommandLineResolutions)
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llvm::errs() << argv[0] << ": unused symbol resolution for "
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||
|
|
<< UnusedRes.first.first << ',' << UnusedRes.first.second
|
||
|
|
<< '\n';
|
||
|
|
}
|
||
|
|
if (HasErrors)
|
||
|
|
return 1;
|
||
|
|
|
||
|
|
auto AddStream =
|
||
|
|
[&](size_t Task) -> std::unique_ptr<lto::NativeObjectStream> {
|
||
|
|
std::string Path = OutputFilename + "." + utostr(Task);
|
||
|
|
|
||
|
|
std::error_code EC;
|
||
|
|
auto S = std::make_unique<raw_fd_ostream>(Path, EC, sys::fs::OF_None);
|
||
|
|
check(EC, Path);
|
||
|
|
return std::make_unique<lto::NativeObjectStream>(std::move(S));
|
||
|
|
};
|
||
|
|
|
||
|
|
auto AddBuffer = [&](size_t Task, std::unique_ptr<MemoryBuffer> MB) {
|
||
|
|
*AddStream(Task)->OS << MB->getBuffer();
|
||
|
|
};
|
||
|
|
|
||
|
|
NativeObjectCache Cache;
|
||
|
|
if (!CacheDir.empty())
|
||
|
|
Cache = check(localCache(CacheDir, AddBuffer), "failed to create cache");
|
||
|
|
|
||
|
|
check(Lto.run(AddStream, Cache), "LTO::run failed");
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int dumpSymtab(int argc, char **argv) {
|
||
|
|
for (StringRef F : make_range(argv + 1, argv + argc)) {
|
||
|
|
std::unique_ptr<MemoryBuffer> MB =
|
||
|
|
check(MemoryBuffer::getFile(F), std::string(F));
|
||
|
|
BitcodeFileContents BFC =
|
||
|
|
check(getBitcodeFileContents(*MB), std::string(F));
|
||
|
|
|
||
|
|
if (BFC.Symtab.size() >= sizeof(irsymtab::storage::Header)) {
|
||
|
|
auto *Hdr = reinterpret_cast<const irsymtab::storage::Header *>(
|
||
|
|
BFC.Symtab.data());
|
||
|
|
outs() << "version: " << Hdr->Version << '\n';
|
||
|
|
if (Hdr->Version == irsymtab::storage::Header::kCurrentVersion)
|
||
|
|
outs() << "producer: " << Hdr->Producer.get(BFC.StrtabForSymtab)
|
||
|
|
<< '\n';
|
||
|
|
}
|
||
|
|
|
||
|
|
std::unique_ptr<InputFile> Input =
|
||
|
|
check(InputFile::create(MB->getMemBufferRef()), std::string(F));
|
||
|
|
|
||
|
|
outs() << "target triple: " << Input->getTargetTriple() << '\n';
|
||
|
|
Triple TT(Input->getTargetTriple());
|
||
|
|
|
||
|
|
outs() << "source filename: " << Input->getSourceFileName() << '\n';
|
||
|
|
|
||
|
|
if (TT.isOSBinFormatCOFF())
|
||
|
|
outs() << "linker opts: " << Input->getCOFFLinkerOpts() << '\n';
|
||
|
|
|
||
|
|
if (TT.isOSBinFormatELF()) {
|
||
|
|
outs() << "dependent libraries:";
|
||
|
|
for (auto L : Input->getDependentLibraries())
|
||
|
|
outs() << " \"" << L << "\"";
|
||
|
|
outs() << '\n';
|
||
|
|
}
|
||
|
|
|
||
|
|
std::vector<StringRef> ComdatTable = Input->getComdatTable();
|
||
|
|
for (const InputFile::Symbol &Sym : Input->symbols()) {
|
||
|
|
switch (Sym.getVisibility()) {
|
||
|
|
case GlobalValue::HiddenVisibility:
|
||
|
|
outs() << 'H';
|
||
|
|
break;
|
||
|
|
case GlobalValue::ProtectedVisibility:
|
||
|
|
outs() << 'P';
|
||
|
|
break;
|
||
|
|
case GlobalValue::DefaultVisibility:
|
||
|
|
outs() << 'D';
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
auto PrintBool = [&](char C, bool B) { outs() << (B ? C : '-'); };
|
||
|
|
PrintBool('U', Sym.isUndefined());
|
||
|
|
PrintBool('C', Sym.isCommon());
|
||
|
|
PrintBool('W', Sym.isWeak());
|
||
|
|
PrintBool('I', Sym.isIndirect());
|
||
|
|
PrintBool('O', Sym.canBeOmittedFromSymbolTable());
|
||
|
|
PrintBool('T', Sym.isTLS());
|
||
|
|
PrintBool('X', Sym.isExecutable());
|
||
|
|
outs() << ' ' << Sym.getName() << '\n';
|
||
|
|
|
||
|
|
if (Sym.isCommon())
|
||
|
|
outs() << " size " << Sym.getCommonSize() << " align "
|
||
|
|
<< Sym.getCommonAlignment() << '\n';
|
||
|
|
|
||
|
|
int Comdat = Sym.getComdatIndex();
|
||
|
|
if (Comdat != -1)
|
||
|
|
outs() << " comdat " << ComdatTable[Comdat] << '\n';
|
||
|
|
|
||
|
|
if (TT.isOSBinFormatCOFF() && Sym.isWeak() && Sym.isIndirect())
|
||
|
|
outs() << " fallback " << Sym.getCOFFWeakExternalFallback() << '\n';
|
||
|
|
|
||
|
|
if (!Sym.getSectionName().empty())
|
||
|
|
outs() << " section " << Sym.getSectionName() << "\n";
|
||
|
|
}
|
||
|
|
|
||
|
|
outs() << '\n';
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int main(int argc, char **argv) {
|
||
|
|
InitLLVM X(argc, argv);
|
||
|
|
InitializeAllTargets();
|
||
|
|
InitializeAllTargetMCs();
|
||
|
|
InitializeAllAsmPrinters();
|
||
|
|
InitializeAllAsmParsers();
|
||
|
|
|
||
|
|
// FIXME: This should use llvm::cl subcommands, but it isn't currently
|
||
|
|
// possible to pass an argument not associated with a subcommand to a
|
||
|
|
// subcommand (e.g. -use-new-pm).
|
||
|
|
if (argc < 2)
|
||
|
|
return usage();
|
||
|
|
|
||
|
|
StringRef Subcommand = argv[1];
|
||
|
|
// Ensure that argv[0] is correct after adjusting argv/argc.
|
||
|
|
argv[1] = argv[0];
|
||
|
|
if (Subcommand == "dump-symtab")
|
||
|
|
return dumpSymtab(argc - 1, argv + 1);
|
||
|
|
if (Subcommand == "run")
|
||
|
|
return run(argc - 1, argv + 1);
|
||
|
|
return usage();
|
||
|
|
}
|