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a96fe1bf3b
@tejohnson noticed that freeing MemoryBuffer instances right before `lto->compile` can save RSS, likely because the memory can be reused by LTO indexing (e.g. ThinLTO import/export lists).). For ELFFileBase instances, symbol and section names are backed by MemoryBuffer, so destroying MemoryBuffer would make some infrequent passes (parseSymbolVersion, reportBackrefs) crash and make debugging difficult. For a BitcodeFile, its content is completely unused, but destroying its MemoryBuffer makes the buffer identifier inaccessible and may introduce constraints for future changes. This patch leverages madvise(MADV_DONTNEED) which achieves the major gain without the latent issues. `Maximum resident set size (kbytes): ` for a large --thinlto-index-only link: * current behavior: 10146104KiB * destroy MemoryBuffer instances: 8555240KiB * madvise(MADV_DONTNEED) just bitcodeFiles and lazyBitcodeFiles: 8737372KiB * madvise(MADV_DONTNEED) all MemoryBuffers: 8739796KiB (16% decrease) Depends on D116366 Reviewed By: tejohnson Differential Revision: https://reviews.llvm.org/D116367
78 lines
2.1 KiB
C++
78 lines
2.1 KiB
C++
//===- Driver.h -------------------------------------------------*- C++ -*-===//
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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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#ifndef LLD_ELF_DRIVER_H
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#define LLD_ELF_DRIVER_H
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#include "LTO.h"
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#include "SymbolTable.h"
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#include "lld/Common/LLVM.h"
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#include "lld/Common/Reproduce.h"
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#include "llvm/ADT/Optional.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/ADT/StringSet.h"
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#include "llvm/Option/ArgList.h"
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#include "llvm/Support/raw_ostream.h"
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namespace lld {
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namespace elf {
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extern std::unique_ptr<class LinkerDriver> driver;
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class LinkerDriver {
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public:
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void linkerMain(ArrayRef<const char *> args);
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void addFile(StringRef path, bool withLOption);
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void addLibrary(StringRef name);
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private:
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void createFiles(llvm::opt::InputArgList &args);
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void inferMachineType();
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template <class ELFT> void link(llvm::opt::InputArgList &args);
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template <class ELFT> void compileBitcodeFiles(bool skipLinkedOutput);
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// True if we are in --whole-archive and --no-whole-archive.
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bool inWholeArchive = false;
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// True if we are in --start-lib and --end-lib.
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bool inLib = false;
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// For LTO.
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std::unique_ptr<BitcodeCompiler> lto;
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std::vector<InputFile *> files;
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};
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// Parses command line options.
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class ELFOptTable : public llvm::opt::OptTable {
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public:
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ELFOptTable();
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llvm::opt::InputArgList parse(ArrayRef<const char *> argv);
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};
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// Create enum with OPT_xxx values for each option in Options.td
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enum {
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OPT_INVALID = 0,
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#define OPTION(_1, _2, ID, _4, _5, _6, _7, _8, _9, _10, _11, _12) OPT_##ID,
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#include "Options.inc"
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#undef OPTION
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};
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void printHelp();
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std::string createResponseFile(const llvm::opt::InputArgList &args);
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llvm::Optional<std::string> findFromSearchPaths(StringRef path);
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llvm::Optional<std::string> searchScript(StringRef path);
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llvm::Optional<std::string> searchLibraryBaseName(StringRef path);
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llvm::Optional<std::string> searchLibrary(StringRef path);
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} // namespace elf
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} // namespace lld
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#endif
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