/Users/buildslave/jenkins/workspace/clang-stage2-coverage-R/llvm/lib/CodeGen/AsmPrinter/AddressPool.h
Line | Count | Source |
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 | 248 | 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 | 35.7k | 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 | 5.87k | bool isEmpty() { return Pool.empty(); } |
48 | | |
49 | 50 | bool hasBeenUsed() const { return HasBeenUsed; } |
50 | | |
51 | 53 | void resetUsedFlag() { HasBeenUsed = false; } |
52 | | |
53 | 108 | MCSymbol *getLabel() { return AddressTableBaseSym; } |
54 | 35.7k | 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 |