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0af0deeed9
Summary: This change fixes https://crbug.com/834474, a build failure caused by LowerTypeTests not preserving .symver symbol versioning directives for exported functions. Emit symver information to ThinLTO summary data and then propagate symver directives for exported functions to the merged module. Emitting symver information to the summaries increases the size of intermediate build artifacts for a Chromium build by less than 0.2%. Reviewers: pcc Reviewed By: pcc Subscribers: tejohnson, mehdi_amini, eraman, llvm-commits, eugenis, kcc Differential Revision: https://reviews.llvm.org/D45798 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@330387 91177308-0d34-0410-b5e6-96231b3b80d8
74 lines
2.2 KiB
C++
74 lines
2.2 KiB
C++
//===- ModuleSymbolTable.h - symbol table for in-memory IR ------*- 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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//
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// This class represents a symbol table built from in-memory IR. It provides
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// access to GlobalValues and should only be used if such access is required
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// (e.g. in the LTO implementation).
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_OBJECT_MODULESYMBOLTABLE_H
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#define LLVM_OBJECT_MODULESYMBOLTABLE_H
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/PointerUnion.h"
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#include "llvm/IR/Mangler.h"
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#include "llvm/Object/SymbolicFile.h"
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#include "llvm/Support/Allocator.h"
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#include <cstdint>
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#include <string>
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#include <utility>
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#include <vector>
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namespace llvm {
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class GlobalValue;
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class ModuleSymbolTable {
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public:
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using AsmSymbol = std::pair<std::string, uint32_t>;
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using Symbol = PointerUnion<GlobalValue *, AsmSymbol *>;
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private:
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Module *FirstMod = nullptr;
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SpecificBumpPtrAllocator<AsmSymbol> AsmSymbols;
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std::vector<Symbol> SymTab;
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Mangler Mang;
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public:
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ArrayRef<Symbol> symbols() const { return SymTab; }
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void addModule(Module *M);
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void printSymbolName(raw_ostream &OS, Symbol S) const;
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uint32_t getSymbolFlags(Symbol S) const;
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/// Parse inline ASM and collect the symbols that are defined or referenced in
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/// the current module.
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///
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/// For each found symbol, call \p AsmSymbol with the name of the symbol found
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/// and the associated flags.
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static void CollectAsmSymbols(
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const Module &M,
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function_ref<void(StringRef, object::BasicSymbolRef::Flags)> AsmSymbol);
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/// Parse inline ASM and collect the symvers directives that are defined in
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/// the current module.
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///
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/// For each found symbol, call \p AsmSymver with the name of the symbol and
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/// its alias.
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static void
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CollectAsmSymvers(const Module &M,
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function_ref<void(StringRef, StringRef)> AsmSymver);
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};
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} // end namespace llvm
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#endif // LLVM_OBJECT_MODULESYMBOLTABLE_H
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