forked from OSchip/llvm-project
66 lines
1.9 KiB
C++
66 lines
1.9 KiB
C++
//===- llvm/CodeGen/AddressPool.h - Dwarf Debug Framework -------*- 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_CODEGEN_ASMPRINTER_ADDRESSPOOL_H
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#define LLVM_LIB_CODEGEN_ASMPRINTER_ADDRESSPOOL_H
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#include "llvm/ADT/DenseMap.h"
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namespace llvm {
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class AsmPrinter;
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class MCSection;
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class MCSymbol;
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// Collection of addresses for this unit and assorted labels.
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// A Symbol->unsigned mapping of addresses used by indirect
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// references.
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class AddressPool {
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struct AddressPoolEntry {
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unsigned Number;
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bool TLS;
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AddressPoolEntry(unsigned Number, bool TLS) : Number(Number), TLS(TLS) {}
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};
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DenseMap<const MCSymbol *, AddressPoolEntry> Pool;
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/// Record whether the AddressPool has been queried for an address index since
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/// the last "resetUsedFlag" call. Used to implement type unit fallback - a
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/// type that references addresses cannot be placed in a type unit when using
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/// fission.
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bool HasBeenUsed = false;
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public:
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AddressPool() = default;
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/// Returns the index into the address pool with the given
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/// label/symbol.
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unsigned getIndex(const MCSymbol *Sym, bool TLS = false);
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void emit(AsmPrinter &Asm, MCSection *AddrSection);
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bool isEmpty() { return Pool.empty(); }
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bool hasBeenUsed() const { return HasBeenUsed; }
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void resetUsedFlag() { HasBeenUsed = false; }
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MCSymbol *getLabel() { return AddressTableBaseSym; }
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void setLabel(MCSymbol *Sym) { AddressTableBaseSym = Sym; }
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private:
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MCSymbol *emitHeader(AsmPrinter &Asm, MCSection *Section);
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/// Symbol designates the start of the contribution to the address table.
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MCSymbol *AddressTableBaseSym = nullptr;
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};
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} // end namespace llvm
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#endif // LLVM_LIB_CODEGEN_ASMPRINTER_ADDRESSPOOL_H
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