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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
64 lines
2.5 KiB
C++
64 lines
2.5 KiB
C++
//===-- FunctionInfo.cpp - Function Info Index ----------------------------===//
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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 file implements the function info index and summary classes for the
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// IR library.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/IR/FunctionInfo.h"
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#include "llvm/ADT/StringMap.h"
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using namespace llvm;
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// Create the combined function index/summary from multiple
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// per-module instances.
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void FunctionInfoIndex::mergeFrom(std::unique_ptr<FunctionInfoIndex> Other,
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uint64_t NextModuleId) {
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StringRef ModPath;
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for (auto &OtherFuncInfoLists : *Other) {
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StringRef FuncName = OtherFuncInfoLists.getKey();
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FunctionInfoList &List = OtherFuncInfoLists.second;
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// Assert that the func info list only has one entry, since we shouldn't
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// have duplicate names within a single per-module index.
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assert(List.size() == 1);
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std::unique_ptr<FunctionInfo> Info = std::move(List.front());
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// Add the module path string ref for this module if we haven't already
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// saved a reference to it.
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if (ModPath.empty())
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ModPath =
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addModulePath(Info->functionSummary()->modulePath(), NextModuleId);
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else
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assert(ModPath == Info->functionSummary()->modulePath() &&
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"Each module in the combined map should have a unique ID");
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// Note the module path string ref was copied above and is still owned by
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// the original per-module index. Reset it to the new module path
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// string reference owned by the combined index.
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Info->functionSummary()->setModulePath(ModPath);
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// If it is a local function, rename it.
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if (Info->functionSummary()->isLocalFunction()) {
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// Any local functions are virtually renamed when being added to the
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// combined index map, to disambiguate from other functions with
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// the same name. The symbol table created for the combined index
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// file should contain the renamed symbols.
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FuncName =
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FunctionInfoIndex::getGlobalNameForLocal(FuncName, NextModuleId);
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}
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// Add new function info to existing list. There may be duplicates when
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// combining FunctionMap entries, due to COMDAT functions. Any local
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// functions were virtually renamed above.
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addFunctionInfo(FuncName, std::move(Info));
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}
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}
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