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//===-- RecordStreamer.h - Record asm defined and used symbols ---*- C++ -*===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_OBJECT_RECORDSTREAMER_H
#define LLVM_LIB_OBJECT_RECORDSTREAMER_H
#include "llvm/MC/MCStreamer.h"
namespace llvm {
class RecordStreamer : public MCStreamer {
public:
enum State { NeverSeen, Global, Defined, DefinedGlobal, DefinedWeak, Used,
UndefinedWeak};
private:
StringMap<State> Symbols;
// Map of aliases created by .symver directives, saved so we can update
// their symbol binding after parsing complete. This maps from each
// aliasee to its list of aliases.
DenseMap<const MCSymbol *, std::vector<MCSymbol *>> SymverAliasMap;
void markDefined(const MCSymbol &Symbol);
void markGlobal(const MCSymbol &Symbol, MCSymbolAttr Attribute);
void markUsed(const MCSymbol &Symbol);
void visitUsedSymbol(const MCSymbol &Sym) override;
public:
typedef StringMap<State>::const_iterator const_iterator;
const_iterator begin();
const_iterator end();
RecordStreamer(MCContext &Context);
void EmitInstruction(const MCInst &Inst, const MCSubtargetInfo &STI) override;
void EmitLabel(MCSymbol *Symbol, SMLoc Loc = SMLoc()) override;
void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) override;
bool EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute) override;
void EmitZerofill(MCSection *Section, MCSymbol *Symbol, uint64_t Size,
unsigned ByteAlignment) override;
void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
unsigned ByteAlignment) override;
/// Record .symver aliases for later processing.
void emitELFSymverDirective(MCSymbol *Alias,
const MCSymbol *Aliasee) override;
/// Return the map of .symver aliasee to associated aliases.
DenseMap<const MCSymbol *, std::vector<MCSymbol *>> &symverAliases() {
return SymverAliasMap;
}
/// Get the state recorded for the given symbol.
State getSymbolState(const MCSymbol *Sym) {
auto SI = Symbols.find(Sym->getName());
if (SI == Symbols.end())
return NeverSeen;
return SI->second;
}
};
}
#endif
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