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| //===- llvm/CodeGen/AddressPool.h - Dwarf Debug Framework -------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_CODEGEN_ASMPRINTER_ADDRESSPOOL_H
#define LLVM_LIB_CODEGEN_ASMPRINTER_ADDRESSPOOL_H
#include "llvm/ADT/DenseMap.h"
namespace llvm {
class AsmPrinter;
class MCSection;
class MCSymbol;
// Collection of addresses for this unit and assorted labels.
// A Symbol->unsigned mapping of addresses used by indirect
// references.
class AddressPool {
struct AddressPoolEntry {
unsigned Number;
bool TLS;
AddressPoolEntry(unsigned Number, bool TLS) : Number(Number), TLS(TLS) {}
};
DenseMap<const MCSymbol *, AddressPoolEntry> Pool;
/// Record whether the AddressPool has been queried for an address index since
/// the last "resetUsedFlag" call. Used to implement type unit fallback - a
/// type that references addresses cannot be placed in a type unit when using
/// fission.
bool HasBeenUsed = false;
public:
AddressPool() = default;
/// Returns the index into the address pool with the given
/// label/symbol.
unsigned getIndex(const MCSymbol *Sym, bool TLS = false);
void emit(AsmPrinter &Asm, MCSection *AddrSection);
bool isEmpty() { return Pool.empty(); }
bool hasBeenUsed() const { return HasBeenUsed; }
void resetUsedFlag() { HasBeenUsed = false; }
MCSymbol *getLabel() { return AddressTableBaseSym; }
void setLabel(MCSymbol *Sym) { AddressTableBaseSym = Sym; }
private:
MCSymbol *emitHeader(AsmPrinter &Asm, MCSection *Section);
/// Symbol designates the start of the contribution to the address table.
MCSymbol *AddressTableBaseSym = nullptr;
};
} // end namespace llvm
#endif // LLVM_LIB_CODEGEN_ASMPRINTER_ADDRESSPOOL_H
|