1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
|
#pragma once
#ifdef __GNUC__
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunused-parameter"
#endif
//===- llvm/CodeGen/DbgEntityHistoryCalculator.h ----------------*- 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_CODEGEN_DBGENTITYHISTORYCALCULATOR_H
#define LLVM_CODEGEN_DBGENTITYHISTORYCALCULATOR_H
#include "llvm/ADT/MapVector.h"
#include "llvm/ADT/PointerIntPair.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/CodeGen/LexicalScopes.h"
#include <utility>
namespace llvm {
class DILocation;
class DINode;
class MachineFunction;
class MachineInstr;
class TargetRegisterInfo;
/// Record instruction ordering so we can query their relative positions within
/// a function. Meta instructions are given the same ordinal as the preceding
/// non-meta instruction. Class state is invalid if MF is modified after
/// calling initialize.
class InstructionOrdering {
public:
void initialize(const MachineFunction &MF);
void clear() { InstNumberMap.clear(); }
/// Check if instruction \p A comes before \p B, where \p A and \p B both
/// belong to the MachineFunction passed to initialize().
bool isBefore(const MachineInstr *A, const MachineInstr *B) const;
private:
/// Each instruction is assigned an order number.
DenseMap<const MachineInstr *, unsigned> InstNumberMap;
};
/// For each user variable, keep a list of instruction ranges where this
/// variable is accessible. The variables are listed in order of appearance.
class DbgValueHistoryMap {
public:
/// Index in the entry vector.
typedef size_t EntryIndex;
/// Special value to indicate that an entry is valid until the end of the
/// function.
static const EntryIndex NoEntry = std::numeric_limits<EntryIndex>::max();
/// Specifies a change in a variable's debug value history.
///
/// There exist two types of entries:
///
/// * Debug value entry:
///
/// A new debug value becomes live. If the entry's \p EndIndex is \p NoEntry,
/// the value is valid until the end of the function. For other values, the
/// index points to the entry in the entry vector that ends this debug
/// value. The ending entry can either be an overlapping debug value, or
/// an instruction that clobbers the value.
///
/// * Clobbering entry:
///
/// This entry's instruction clobbers one or more preceding
/// register-described debug values that have their end index
/// set to this entry's position in the entry vector.
class Entry {
friend DbgValueHistoryMap;
public:
enum EntryKind { DbgValue, Clobber };
Entry(const MachineInstr *Instr, EntryKind Kind)
: Instr(Instr, Kind), EndIndex(NoEntry) {}
const MachineInstr *getInstr() const { return Instr.getPointer(); }
EntryIndex getEndIndex() const { return EndIndex; }
EntryKind getEntryKind() const { return Instr.getInt(); }
bool isClobber() const { return getEntryKind() == Clobber; }
bool isDbgValue() const { return getEntryKind() == DbgValue; }
bool isClosed() const { return EndIndex != NoEntry; }
void endEntry(EntryIndex EndIndex);
private:
PointerIntPair<const MachineInstr *, 1, EntryKind> Instr;
EntryIndex EndIndex;
};
using Entries = SmallVector<Entry, 4>;
using InlinedEntity = std::pair<const DINode *, const DILocation *>;
using EntriesMap = MapVector<InlinedEntity, Entries>;
private:
EntriesMap VarEntries;
public:
bool startDbgValue(InlinedEntity Var, const MachineInstr &MI,
EntryIndex &NewIndex);
EntryIndex startClobber(InlinedEntity Var, const MachineInstr &MI);
Entry &getEntry(InlinedEntity Var, EntryIndex Index) {
auto &Entries = VarEntries[Var];
return Entries[Index];
}
/// Test whether a vector of entries features any non-empty locations. It
/// could have no entries, or only DBG_VALUE $noreg entries.
bool hasNonEmptyLocation(const Entries &Entries) const;
/// Drop location ranges which exist entirely outside each variable's scope.
void trimLocationRanges(const MachineFunction &MF, LexicalScopes &LScopes,
const InstructionOrdering &Ordering);
bool empty() const { return VarEntries.empty(); }
void clear() { VarEntries.clear(); }
EntriesMap::const_iterator begin() const { return VarEntries.begin(); }
EntriesMap::const_iterator end() const { return VarEntries.end(); }
#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
LLVM_DUMP_METHOD void dump() const;
#endif
};
/// For each inlined instance of a source-level label, keep the corresponding
/// DBG_LABEL instruction. The DBG_LABEL instruction could be used to generate
/// a temporary (assembler) label before it.
class DbgLabelInstrMap {
public:
using InlinedEntity = std::pair<const DINode *, const DILocation *>;
using InstrMap = MapVector<InlinedEntity, const MachineInstr *>;
private:
InstrMap LabelInstr;
public:
void addInstr(InlinedEntity Label, const MachineInstr &MI);
bool empty() const { return LabelInstr.empty(); }
void clear() { LabelInstr.clear(); }
InstrMap::const_iterator begin() const { return LabelInstr.begin(); }
InstrMap::const_iterator end() const { return LabelInstr.end(); }
};
void calculateDbgEntityHistory(const MachineFunction *MF,
const TargetRegisterInfo *TRI,
DbgValueHistoryMap &DbgValues,
DbgLabelInstrMap &DbgLabels);
} // end namespace llvm
#endif // LLVM_CODEGEN_DBGENTITYHISTORYCALCULATOR_H
#ifdef __GNUC__
#pragma GCC diagnostic pop
#endif
|
