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7517775e7d
As a resolution to https://sourceware.org/bugzilla/show_bug.cgi?id=25295 , GNU as from binutils 2.35 supports the optional third argument for the .symver directive. 'remove' for a non-default version is useful: `.symver def_v1, def@v1, remove` => def_v1 is not retained in the symbol table. Previously the user has to strip the original symbol or specify a `local:` version node in a version script to localize the symbol. `.symver def, def@@v1, remove` and `.symver def, def@@@v1, remove` are supported as well, though they are identical to `.symver def, def@@@v1`. local/hidden are not useful so this patch does not implement them.
86 lines
3.1 KiB
C++
86 lines
3.1 KiB
C++
//===- RecordStreamer.h - Record asm defined and used symbols ---*- 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 LLVM_LIB_OBJECT_RECORDSTREAMER_H
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#define LLVM_LIB_OBJECT_RECORDSTREAMER_H
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/StringMap.h"
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#include "llvm/MC/MCDirectives.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/Support/SMLoc.h"
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#include <vector>
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namespace llvm {
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class MCSymbol;
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class Module;
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class RecordStreamer : public MCStreamer {
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public:
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enum State { NeverSeen, Global, Defined, DefinedGlobal, DefinedWeak, Used,
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UndefinedWeak};
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private:
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const Module &M;
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StringMap<State> Symbols;
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// Map of aliases created by .symver directives, saved so we can update
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// their symbol binding after parsing complete. This maps from each
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// aliasee to its list of aliases.
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DenseMap<const MCSymbol *, std::vector<StringRef>> SymverAliasMap;
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/// Get the state recorded for the given symbol.
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State getSymbolState(const MCSymbol *Sym);
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void markDefined(const MCSymbol &Symbol);
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void markGlobal(const MCSymbol &Symbol, MCSymbolAttr Attribute);
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void markUsed(const MCSymbol &Symbol);
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void visitUsedSymbol(const MCSymbol &Sym) override;
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public:
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RecordStreamer(MCContext &Context, const Module &M);
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void emitInstruction(const MCInst &Inst, const MCSubtargetInfo &STI) override;
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void emitLabel(MCSymbol *Symbol, SMLoc Loc = SMLoc()) override;
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void emitAssignment(MCSymbol *Symbol, const MCExpr *Value) override;
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bool emitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute) override;
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void emitZerofill(MCSection *Section, MCSymbol *Symbol, uint64_t Size,
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unsigned ByteAlignment, SMLoc Loc = SMLoc()) override;
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void emitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
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unsigned ByteAlignment) override;
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// Ignore COFF-specific directives; we do not need any information from them,
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// but the default implementation of these methods crashes, so we override
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// them with versions that do nothing.
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void BeginCOFFSymbolDef(const MCSymbol *Symbol) override {}
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void EmitCOFFSymbolStorageClass(int StorageClass) override {}
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void EmitCOFFSymbolType(int Type) override {}
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void EndCOFFSymbolDef() override {}
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/// Record .symver aliases for later processing.
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void emitELFSymverDirective(const MCSymbol *OriginalSym, StringRef Name,
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bool KeepOriginalSym) override;
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// Emit ELF .symver aliases and ensure they have the same binding as the
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// defined symbol they alias with.
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void flushSymverDirectives();
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// Symbols iterators
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using const_iterator = StringMap<State>::const_iterator;
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const_iterator begin();
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const_iterator end();
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// SymverAliasMap iterators
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using const_symver_iterator = decltype(SymverAliasMap)::const_iterator;
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iterator_range<const_symver_iterator> symverAliases();
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};
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} // end namespace llvm
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#endif // LLVM_LIB_OBJECT_RECORDSTREAMER_H
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