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
|
//===--- OwnershipPhiOperand.h --------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2020 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
#ifndef SWIFT_SILOPTIMIZER_SEMANTICARC_OWNERSHIPPHIOPERAND_H
#define SWIFT_SILOPTIMIZER_SEMANTICARC_OWNERSHIPPHIOPERAND_H
#include "swift/Basic/STLExtras.h"
#include "swift/SIL/SILArgument.h"
#include "swift/SIL/SILBasicBlock.h"
#include "swift/SIL/SILInstruction.h"
#include "swift/SIL/SILUndef.h"
#include "swift/SIL/SILValue.h"
namespace swift {
namespace semanticarc {
/// The operand of a "phi" in the induced ownership graph of a def-use graph.
///
/// Some examples: br, struct, tuple.
class LLVM_LIBRARY_VISIBILITY OwnershipPhiOperand {
public:
enum Kind {
Branch,
Struct,
Tuple,
};
private:
Operand *op;
OwnershipPhiOperand(Operand *op) : op(op) {}
public:
static std::optional<OwnershipPhiOperand> get(const Operand *op) {
switch (op->getUser()->getKind()) {
case SILInstructionKind::BranchInst:
case SILInstructionKind::StructInst:
case SILInstructionKind::TupleInst:
return {{const_cast<Operand *>(op)}};
default:
return std::nullopt;
}
}
Kind getKind() const {
switch (op->getUser()->getKind()) {
case SILInstructionKind::BranchInst:
return Kind::Branch;
case SILInstructionKind::StructInst:
return Kind::Struct;
case SILInstructionKind::TupleInst:
return Kind::Tuple;
default:
llvm_unreachable("unhandled case?!");
}
}
operator const Operand *() const { return op; }
operator Operand *() { return op; }
Operand *getOperand() const { return op; }
SILValue getValue() const { return op->get(); }
SILType getType() const { return op->get()->getType(); }
unsigned getOperandNumber() const { return op->getOperandNumber(); }
void markUndef() & { op->set(SILUndef::get(getValue())); }
SILInstruction *getInst() const { return op->getUser(); }
/// Return true if this phi consumes a borrow.
///
/// If so, we may need to insert an extra begin_borrow to balance the +1 when
/// converting owned ownership phis to guaranteed ownership phis.
bool isGuaranteedConsuming() const {
switch (getKind()) {
case Kind::Branch:
return true;
case Kind::Tuple:
case Kind::Struct:
return false;
}
llvm_unreachable("unhandled operand kind!");
}
bool operator<(const OwnershipPhiOperand &other) const {
return op < other.op;
}
bool operator==(const OwnershipPhiOperand &other) const {
return op == other.op;
}
bool visitResults(function_ref<bool(SILValue)> visitor) const {
switch (getKind()) {
case Kind::Struct:
return visitor(cast<StructInst>(getInst()));
case Kind::Tuple:
return visitor(cast<TupleInst>(getInst()));
case Kind::Branch: {
auto *br = cast<BranchInst>(getInst());
unsigned opNum = getOperandNumber();
return llvm::all_of(
br->getSuccessorBlocks(), [&](SILBasicBlock *succBlock) {
return visitor(succBlock->getSILPhiArguments()[opNum]);
});
}
}
llvm_unreachable("unhandled operand kind!");
}
};
} // namespace semanticarc
} // namespace swift
#endif // SWIFT_SILOPTIMIZER_SEMANTICARC_OWNERSHIPPHIOPERAND_H
|
