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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
79 lines
2.8 KiB
C++
79 lines
2.8 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/MC/MCSymbol.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 GlobalValue;
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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,
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bool) 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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/// Record .symver aliases for later processing.
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void emitELFSymverDirective(StringRef AliasName,
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const MCSymbol *Aliasee) 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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