forked from OSchip/llvm-project
76 lines
2.6 KiB
C++
76 lines
2.6 KiB
C++
//===- 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/ADT/DenseMap.h"
|
|
#include "llvm/ADT/StringMap.h"
|
|
#include "llvm/MC/MCDirectives.h"
|
|
#include "llvm/MC/MCStreamer.h"
|
|
#include "llvm/MC/MCSymbol.h"
|
|
#include "llvm/Support/SMLoc.h"
|
|
#include <vector>
|
|
|
|
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:
|
|
RecordStreamer(MCContext &Context);
|
|
|
|
using const_iterator = StringMap<State>::const_iterator;
|
|
|
|
const_iterator begin();
|
|
const_iterator end();
|
|
void EmitInstruction(const MCInst &Inst, const MCSubtargetInfo &STI,
|
|
bool) 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;
|
|
}
|
|
};
|
|
|
|
} // end namespace llvm
|
|
|
|
#endif // LLVM_LIB_OBJECT_RECORDSTREAMER_H
|