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091cf86389
Summary: The bitcode format is described in this document: https://drive.google.com/file/d/0B036uwnWM6RWdnBLakxmeDdOeXc/view For more info on ThinLTO see: https://sites.google.com/site/llvmthinlto The first customer is ThinLTO, however the data structures are designed and named more generally based on prior feedback. There are a few comments regarding how certain interfaces are used by ThinLTO, and the options added here to gold currently have ThinLTO-specific names as the behavior they provoke is currently ThinLTO-specific. This patch includes support for generating per-module function indexes, the combined index file via the gold plugin, and several tests (more are included with the associated clang patch D11908). Reviewers: dexonsmith, davidxl, joker.eph Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D13107 llvm-svn: 249270
72 lines
2.4 KiB
C++
72 lines
2.4 KiB
C++
//===-- BitcodeWriterPass.h - Bitcode writing pass --------------*- C++ -*-===//
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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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/// \file
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///
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/// This file provides a bitcode writing pass.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_BITCODE_BITCODEWRITERPASS_H
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#define LLVM_BITCODE_BITCODEWRITERPASS_H
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#include "llvm/ADT/StringRef.h"
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namespace llvm {
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class Module;
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class ModulePass;
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class raw_ostream;
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class PreservedAnalyses;
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/// \brief Create and return a pass that writes the module to the specified
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/// ostream. Note that this pass is designed for use with the legacy pass
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/// manager.
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///
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/// If \c ShouldPreserveUseListOrder, encode use-list order so it can be
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/// reproduced when deserialized.
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///
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/// If \c EmitFunctionSummary, emit the function summary index (currently
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/// for use in ThinLTO optimization).
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ModulePass *createBitcodeWriterPass(raw_ostream &Str,
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bool ShouldPreserveUseListOrder = false,
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bool EmitFunctionSummary = false);
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/// \brief Pass for writing a module of IR out to a bitcode file.
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///
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/// Note that this is intended for use with the new pass manager. To construct
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/// a pass for the legacy pass manager, use the function above.
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class BitcodeWriterPass {
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raw_ostream &OS;
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bool ShouldPreserveUseListOrder;
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bool EmitFunctionSummary;
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public:
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/// \brief Construct a bitcode writer pass around a particular output stream.
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///
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/// If \c ShouldPreserveUseListOrder, encode use-list order so it can be
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/// reproduced when deserialized.
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///
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/// If \c EmitFunctionSummary, emit the function summary index (currently
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/// for use in ThinLTO optimization).
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explicit BitcodeWriterPass(raw_ostream &OS,
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bool ShouldPreserveUseListOrder = false,
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bool EmitFunctionSummary = false)
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: OS(OS), ShouldPreserveUseListOrder(ShouldPreserveUseListOrder),
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EmitFunctionSummary(EmitFunctionSummary) {}
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/// \brief Run the bitcode writer pass, and output the module to the selected
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/// output stream.
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PreservedAnalyses run(Module &M);
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static StringRef name() { return "BitcodeWriterPass"; }
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};
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}
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#endif
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