Coverage Report

Created: 2019-07-24 05:18

/Users/buildslave/jenkins/workspace/clang-stage2-coverage-R/llvm/lib/Object/RecordStreamer.h
Line
Count
Source
1
//===- RecordStreamer.h - Record asm defined and used symbols ---*- 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_OBJECT_RECORDSTREAMER_H
10
#define LLVM_LIB_OBJECT_RECORDSTREAMER_H
11
12
#include "llvm/ADT/DenseMap.h"
13
#include "llvm/ADT/StringMap.h"
14
#include "llvm/MC/MCDirectives.h"
15
#include "llvm/MC/MCStreamer.h"
16
#include "llvm/MC/MCSymbol.h"
17
#include "llvm/Support/SMLoc.h"
18
#include <vector>
19
20
namespace llvm {
21
22
class GlobalValue;
23
class Module;
24
25
class RecordStreamer : public MCStreamer {
26
public:
27
  enum State { NeverSeen, Global, Defined, DefinedGlobal, DefinedWeak, Used,
28
               UndefinedWeak};
29
30
private:
31
  const Module &M;
32
  StringMap<State> Symbols;
33
  // Map of aliases created by .symver directives, saved so we can update
34
  // their symbol binding after parsing complete. This maps from each
35
  // aliasee to its list of aliases.
36
  DenseMap<const MCSymbol *, std::vector<StringRef>> SymverAliasMap;
37
38
  /// Get the state recorded for the given symbol.
39
  State getSymbolState(const MCSymbol *Sym);
40
41
  void markDefined(const MCSymbol &Symbol);
42
  void markGlobal(const MCSymbol &Symbol, MCSymbolAttr Attribute);
43
  void markUsed(const MCSymbol &Symbol);
44
  void visitUsedSymbol(const MCSymbol &Sym) override;
45
46
public:
47
  RecordStreamer(MCContext &Context, const Module &M);
48
49
  void EmitInstruction(const MCInst &Inst, const MCSubtargetInfo &STI) override;
50
  void EmitLabel(MCSymbol *Symbol, SMLoc Loc = SMLoc()) override;
51
  void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) override;
52
  bool EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute) override;
53
  void EmitZerofill(MCSection *Section, MCSymbol *Symbol, uint64_t Size,
54
                    unsigned ByteAlignment, SMLoc Loc = SMLoc()) override;
55
  void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
56
                        unsigned ByteAlignment) override;
57
58
  // Ignore COFF-specific directives; we do not need any information from them,
59
  // but the default implementation of these methods crashes, so we override
60
  // them with versions that do nothing.
61
1
  void BeginCOFFSymbolDef(const MCSymbol *Symbol) override {}
62
1
  void EmitCOFFSymbolStorageClass(int StorageClass) override {}
63
1
  void EmitCOFFSymbolType(int Type) override {}
64
1
  void EndCOFFSymbolDef() override {}
65
66
  /// Record .symver aliases for later processing.
67
  void emitELFSymverDirective(StringRef AliasName,
68
                              const MCSymbol *Aliasee) override;
69
70
  // Emit ELF .symver aliases and ensure they have the same binding as the
71
  // defined symbol they alias with.
72
  void flushSymverDirectives();
73
74
  // Symbols iterators
75
  using const_iterator = StringMap<State>::const_iterator;
76
  const_iterator begin();
77
  const_iterator end();
78
79
  // SymverAliasMap iterators
80
  using const_symver_iterator = decltype(SymverAliasMap)::const_iterator;
81
  iterator_range<const_symver_iterator> symverAliases();
82
};
83
84
} // end namespace llvm
85
86
#endif // LLVM_LIB_OBJECT_RECORDSTREAMER_H