1 //===- llvm/CodeGen/AddressPool.h - Dwarf Debug Framework -------*- C++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #ifndef LLVM_LIB_CODEGEN_ASMPRINTER_ADDRESSPOOL_H 10 #define LLVM_LIB_CODEGEN_ASMPRINTER_ADDRESSPOOL_H 11 12 #include "llvm/ADT/DenseMap.h" 13 14 namespace llvm { 15 16 class AsmPrinter; 17 class MCSection; 18 class MCSymbol; 19 20 // Collection of addresses for this unit and assorted labels. 21 // A Symbol->unsigned mapping of addresses used by indirect 22 // references. 23 class AddressPool { 24 struct AddressPoolEntry { 25 unsigned Number; 26 bool TLS; 27 28 AddressPoolEntry(unsigned Number, bool TLS) : Number(Number), TLS(TLS) {} 29 }; 30 DenseMap<const MCSymbol *, AddressPoolEntry> Pool; 31 32 /// Record whether the AddressPool has been queried for an address index since 33 /// the last "resetUsedFlag" call. Used to implement type unit fallback - a 34 /// type that references addresses cannot be placed in a type unit when using 35 /// fission. 36 bool HasBeenUsed = false; 37 38 public: 39 AddressPool() = default; 40 41 /// Returns the index into the address pool with the given 42 /// label/symbol. 43 unsigned getIndex(const MCSymbol *Sym, bool TLS = false); 44 45 void emit(AsmPrinter &Asm, MCSection *AddrSection); 46 47 bool isEmpty() { return Pool.empty(); } 48 49 bool hasBeenUsed() const { return HasBeenUsed; } 50 51 void resetUsedFlag(bool HasBeenUsed = false) { this->HasBeenUsed = HasBeenUsed; } 52 53 MCSymbol *getLabel() { return AddressTableBaseSym; } 54 void setLabel(MCSymbol *Sym) { AddressTableBaseSym = Sym; } 55 56 private: 57 MCSymbol *emitHeader(AsmPrinter &Asm, MCSection *Section); 58 59 /// Symbol designates the start of the contribution to the address table. 60 MCSymbol *AddressTableBaseSym = nullptr; 61 }; 62 63 } // end namespace llvm 64 65 #endif // LLVM_LIB_CODEGEN_ASMPRINTER_ADDRESSPOOL_H 66