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
184
185
|
// Copyright (c) 2020 André Perez Maselco
//
// 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_push_id_through_variable.h"
#include "source/fuzz/fuzzer_util.h"
#include "source/fuzz/instruction_descriptor.h"
namespace spvtools {
namespace fuzz {
TransformationPushIdThroughVariable::TransformationPushIdThroughVariable(
protobufs::TransformationPushIdThroughVariable message)
: message_(std::move(message)) {}
TransformationPushIdThroughVariable::TransformationPushIdThroughVariable(
uint32_t value_id, uint32_t value_synonym_id, uint32_t variable_id,
uint32_t variable_storage_class, uint32_t initializer_id,
const protobufs::InstructionDescriptor& instruction_descriptor) {
message_.set_value_id(value_id);
message_.set_value_synonym_id(value_synonym_id);
message_.set_variable_id(variable_id);
message_.set_variable_storage_class(variable_storage_class);
message_.set_initializer_id(initializer_id);
*message_.mutable_instruction_descriptor() = instruction_descriptor;
}
bool TransformationPushIdThroughVariable::IsApplicable(
opt::IRContext* ir_context, const TransformationContext& /*unused*/) const {
// |message_.value_synonym_id| and |message_.variable_id| must be fresh.
if (!fuzzerutil::IsFreshId(ir_context, message_.value_synonym_id()) ||
!fuzzerutil::IsFreshId(ir_context, message_.variable_id())) {
return false;
}
// The instruction to insert before must be defined.
auto instruction_to_insert_before =
FindInstruction(message_.instruction_descriptor(), ir_context);
if (!instruction_to_insert_before) {
return false;
}
// It must be valid to insert the OpStore and OpLoad instruction before it.
if (!fuzzerutil::CanInsertOpcodeBeforeInstruction(
spv::Op::OpStore, instruction_to_insert_before) ||
!fuzzerutil::CanInsertOpcodeBeforeInstruction(
spv::Op::OpLoad, instruction_to_insert_before)) {
return false;
}
// The instruction to insert before must belong to a reachable block.
auto basic_block = ir_context->get_instr_block(instruction_to_insert_before);
if (!ir_context->IsReachable(*basic_block)) {
return false;
}
// The value instruction must be defined and have a type.
auto value_instruction =
ir_context->get_def_use_mgr()->GetDef(message_.value_id());
if (!value_instruction || !value_instruction->type_id()) {
return false;
}
// A pointer type instruction pointing to the value type must be defined.
auto pointer_type_id = fuzzerutil::MaybeGetPointerType(
ir_context, value_instruction->type_id(),
static_cast<spv::StorageClass>(message_.variable_storage_class()));
if (!pointer_type_id) {
return false;
}
// |message_.variable_storage_class| must be private or function.
assert((message_.variable_storage_class() ==
(uint32_t)spv::StorageClass::Private ||
message_.variable_storage_class() ==
(uint32_t)spv::StorageClass::Function) &&
"The variable storage class must be private or function.");
// Check that initializer is valid.
const auto* constant_inst =
ir_context->get_def_use_mgr()->GetDef(message_.initializer_id());
if (!constant_inst || !spvOpcodeIsConstant(constant_inst->opcode()) ||
value_instruction->type_id() != constant_inst->type_id()) {
return false;
}
// |message_.value_id| must be available at the insertion point.
return fuzzerutil::IdIsAvailableBeforeInstruction(
ir_context, instruction_to_insert_before, message_.value_id());
}
void TransformationPushIdThroughVariable::Apply(
opt::IRContext* ir_context,
TransformationContext* transformation_context) const {
auto value_instruction =
ir_context->get_def_use_mgr()->GetDef(message_.value_id());
opt::Instruction* insert_before =
FindInstruction(message_.instruction_descriptor(), ir_context);
opt::BasicBlock* enclosing_block = ir_context->get_instr_block(insert_before);
// A pointer type instruction pointing to the value type must be defined.
auto pointer_type_id = fuzzerutil::MaybeGetPointerType(
ir_context, value_instruction->type_id(),
static_cast<spv::StorageClass>(message_.variable_storage_class()));
assert(pointer_type_id && "The required pointer type must be available.");
// Adds whether a global or local variable.
if (spv::StorageClass(message_.variable_storage_class()) ==
spv::StorageClass::Private) {
opt::Instruction* global_variable = fuzzerutil::AddGlobalVariable(
ir_context, message_.variable_id(), pointer_type_id,
spv::StorageClass::Private, message_.initializer_id());
ir_context->get_def_use_mgr()->AnalyzeInstDefUse(global_variable);
} else {
opt::Function* function =
ir_context
->get_instr_block(
FindInstruction(message_.instruction_descriptor(), ir_context))
->GetParent();
opt::Instruction* local_variable = fuzzerutil::AddLocalVariable(
ir_context, message_.variable_id(), pointer_type_id,
function->result_id(), message_.initializer_id());
ir_context->get_def_use_mgr()->AnalyzeInstDefUse(local_variable);
ir_context->set_instr_block(local_variable, &*function->entry());
}
// First, insert the OpLoad instruction before |instruction_descriptor| and
// then insert the OpStore instruction before the OpLoad instruction.
fuzzerutil::UpdateModuleIdBound(ir_context, message_.value_synonym_id());
opt::Instruction* load_instruction =
insert_before->InsertBefore(MakeUnique<opt::Instruction>(
ir_context, spv::Op::OpLoad, value_instruction->type_id(),
message_.value_synonym_id(),
opt::Instruction::OperandList(
{{SPV_OPERAND_TYPE_ID, {message_.variable_id()}}})));
opt::Instruction* store_instruction =
load_instruction->InsertBefore(MakeUnique<opt::Instruction>(
ir_context, spv::Op::OpStore, 0, 0,
opt::Instruction::OperandList(
{{SPV_OPERAND_TYPE_ID, {message_.variable_id()}},
{SPV_OPERAND_TYPE_ID, {message_.value_id()}}})));
ir_context->get_def_use_mgr()->AnalyzeInstDefUse(store_instruction);
ir_context->set_instr_block(store_instruction, enclosing_block);
ir_context->get_def_use_mgr()->AnalyzeInstDefUse(load_instruction);
ir_context->set_instr_block(load_instruction, enclosing_block);
// We should be able to create a synonym of |value_id| if it's not irrelevant.
if (fuzzerutil::CanMakeSynonymOf(ir_context, *transformation_context,
*value_instruction) &&
!transformation_context->GetFactManager()->IdIsIrrelevant(
message_.value_synonym_id())) {
// Adds the fact that |message_.value_synonym_id|
// and |message_.value_id| are synonymous.
transformation_context->GetFactManager()->AddFactDataSynonym(
MakeDataDescriptor(message_.value_synonym_id(), {}),
MakeDataDescriptor(message_.value_id(), {}));
}
}
protobufs::Transformation TransformationPushIdThroughVariable::ToMessage()
const {
protobufs::Transformation result;
*result.mutable_push_id_through_variable() = message_;
return result;
}
std::unordered_set<uint32_t> TransformationPushIdThroughVariable::GetFreshIds()
const {
return {message_.value_synonym_id(), message_.variable_id()};
}
} // namespace fuzz
} // namespace spvtools
|
