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76 lines
2.6 KiB
C++
76 lines
2.6 KiB
C++
//===- RecordStreamer.h - Record asm defined and used symbols ---*- 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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#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 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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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<MCSymbol *>> SymverAliasMap;
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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);
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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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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) 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(MCSymbol *Alias,
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const MCSymbol *Aliasee) override;
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/// Return the map of .symver aliasee to associated aliases.
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DenseMap<const MCSymbol *, std::vector<MCSymbol *>> &symverAliases() {
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return SymverAliasMap;
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}
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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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auto SI = Symbols.find(Sym->getName());
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if (SI == Symbols.end())
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return NeverSeen;
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return SI->second;
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}
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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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