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
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
|
// Copyright (c) 2020 Vasyl Teliman
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "source/fuzz/transformation_invert_comparison_operator.h"
#include <utility>
#include "source/fuzz/fuzzer_util.h"
namespace spvtools {
namespace fuzz {
TransformationInvertComparisonOperator::TransformationInvertComparisonOperator(
protobufs::TransformationInvertComparisonOperator message)
: message_(std::move(message)) {}
TransformationInvertComparisonOperator::TransformationInvertComparisonOperator(
uint32_t operator_id, uint32_t fresh_id) {
message_.set_operator_id(operator_id);
message_.set_fresh_id(fresh_id);
}
bool TransformationInvertComparisonOperator::IsApplicable(
opt::IRContext* ir_context, const TransformationContext& /*unused*/) const {
// |message_.operator_id| must be valid and inversion must be supported for
// it.
auto* inst = ir_context->get_def_use_mgr()->GetDef(message_.operator_id());
if (!inst || !IsInversionSupported(inst->opcode())) {
return false;
}
// Check that we can insert negation instruction.
auto* block = ir_context->get_instr_block(inst);
assert(block && "Instruction must have a basic block");
auto iter = fuzzerutil::GetIteratorForInstruction(block, inst);
++iter;
assert(iter != block->end() && "Instruction can't be the last in the block");
assert(fuzzerutil::CanInsertOpcodeBeforeInstruction(SpvOpLogicalNot, iter) &&
"Can't insert negation after comparison operator");
// |message_.fresh_id| must be fresh.
return fuzzerutil::IsFreshId(ir_context, message_.fresh_id());
}
void TransformationInvertComparisonOperator::Apply(
opt::IRContext* ir_context, TransformationContext* /*unused*/) const {
auto* inst = ir_context->get_def_use_mgr()->GetDef(message_.operator_id());
assert(inst && "Result id of an operator is invalid");
// Insert negation after |inst|.
auto iter = fuzzerutil::GetIteratorForInstruction(
ir_context->get_instr_block(inst), inst);
++iter;
iter.InsertBefore(MakeUnique<opt::Instruction>(
ir_context, SpvOpLogicalNot, inst->type_id(), inst->result_id(),
opt::Instruction::OperandList{
{SPV_OPERAND_TYPE_ID, {message_.fresh_id()}}}));
// Change the result id of the original operator to |fresh_id|.
inst->SetResultId(message_.fresh_id());
// Invert the operator.
inst->SetOpcode(InvertOpcode(inst->opcode()));
fuzzerutil::UpdateModuleIdBound(ir_context, message_.fresh_id());
ir_context->InvalidateAnalysesExceptFor(
opt::IRContext::Analysis::kAnalysisNone);
}
bool TransformationInvertComparisonOperator::IsInversionSupported(
SpvOp opcode) {
switch (opcode) {
case SpvOpSGreaterThan:
case SpvOpSGreaterThanEqual:
case SpvOpSLessThan:
case SpvOpSLessThanEqual:
case SpvOpUGreaterThan:
case SpvOpUGreaterThanEqual:
case SpvOpULessThan:
case SpvOpULessThanEqual:
case SpvOpIEqual:
case SpvOpINotEqual:
case SpvOpFOrdEqual:
case SpvOpFUnordEqual:
case SpvOpFOrdNotEqual:
case SpvOpFUnordNotEqual:
case SpvOpFOrdLessThan:
case SpvOpFUnordLessThan:
case SpvOpFOrdLessThanEqual:
case SpvOpFUnordLessThanEqual:
case SpvOpFOrdGreaterThan:
case SpvOpFUnordGreaterThan:
case SpvOpFOrdGreaterThanEqual:
case SpvOpFUnordGreaterThanEqual:
return true;
default:
return false;
}
}
SpvOp TransformationInvertComparisonOperator::InvertOpcode(SpvOp opcode) {
assert(IsInversionSupported(opcode) && "Inversion must be supported");
switch (opcode) {
case SpvOpSGreaterThan:
return SpvOpSLessThanEqual;
case SpvOpSGreaterThanEqual:
return SpvOpSLessThan;
case SpvOpSLessThan:
return SpvOpSGreaterThanEqual;
case SpvOpSLessThanEqual:
return SpvOpSGreaterThan;
case SpvOpUGreaterThan:
return SpvOpULessThanEqual;
case SpvOpUGreaterThanEqual:
return SpvOpULessThan;
case SpvOpULessThan:
return SpvOpUGreaterThanEqual;
case SpvOpULessThanEqual:
return SpvOpUGreaterThan;
case SpvOpIEqual:
return SpvOpINotEqual;
case SpvOpINotEqual:
return SpvOpIEqual;
case SpvOpFOrdEqual:
return SpvOpFUnordNotEqual;
case SpvOpFUnordEqual:
return SpvOpFOrdNotEqual;
case SpvOpFOrdNotEqual:
return SpvOpFUnordEqual;
case SpvOpFUnordNotEqual:
return SpvOpFOrdEqual;
case SpvOpFOrdLessThan:
return SpvOpFUnordGreaterThanEqual;
case SpvOpFUnordLessThan:
return SpvOpFOrdGreaterThanEqual;
case SpvOpFOrdLessThanEqual:
return SpvOpFUnordGreaterThan;
case SpvOpFUnordLessThanEqual:
return SpvOpFOrdGreaterThan;
case SpvOpFOrdGreaterThan:
return SpvOpFUnordLessThanEqual;
case SpvOpFUnordGreaterThan:
return SpvOpFOrdLessThanEqual;
case SpvOpFOrdGreaterThanEqual:
return SpvOpFUnordLessThan;
case SpvOpFUnordGreaterThanEqual:
return SpvOpFOrdLessThan;
default:
// The program will fail in the debug mode because of the assertion
// at the beginning of the function.
return SpvOpNop;
}
}
protobufs::Transformation TransformationInvertComparisonOperator::ToMessage()
const {
protobufs::Transformation result;
*result.mutable_invert_comparison_operator() = message_;
return result;
}
std::unordered_set<uint32_t>
TransformationInvertComparisonOperator::GetFreshIds() const {
return {message_.fresh_id()};
}
} // namespace fuzz
} // namespace spvtools
|
