1 // Copyright (c) 2019 Google LLC
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 #include "source/fuzz/transformation_add_global_variable.h"
16
17 #include "source/fuzz/fuzzer_util.h"
18
19 namespace spvtools {
20 namespace fuzz {
21
TransformationAddGlobalVariable(spvtools::fuzz::protobufs::TransformationAddGlobalVariable message)22 TransformationAddGlobalVariable::TransformationAddGlobalVariable(
23 spvtools::fuzz::protobufs::TransformationAddGlobalVariable message)
24 : message_(std::move(message)) {}
25
TransformationAddGlobalVariable(uint32_t fresh_id,uint32_t type_id,SpvStorageClass storage_class,uint32_t initializer_id,bool value_is_irrelevant)26 TransformationAddGlobalVariable::TransformationAddGlobalVariable(
27 uint32_t fresh_id, uint32_t type_id, SpvStorageClass storage_class,
28 uint32_t initializer_id, bool value_is_irrelevant) {
29 message_.set_fresh_id(fresh_id);
30 message_.set_type_id(type_id);
31 message_.set_storage_class(storage_class);
32 message_.set_initializer_id(initializer_id);
33 message_.set_value_is_irrelevant(value_is_irrelevant);
34 }
35
IsApplicable(opt::IRContext * ir_context,const TransformationContext &) const36 bool TransformationAddGlobalVariable::IsApplicable(
37 opt::IRContext* ir_context, const TransformationContext& /*unused*/) const {
38 // The result id must be fresh.
39 if (!fuzzerutil::IsFreshId(ir_context, message_.fresh_id())) {
40 return false;
41 }
42
43 // The storage class must be Private or Workgroup.
44 auto storage_class = static_cast<SpvStorageClass>(message_.storage_class());
45 switch (storage_class) {
46 case SpvStorageClassPrivate:
47 case SpvStorageClassWorkgroup:
48 break;
49 default:
50 assert(false && "Unsupported storage class.");
51 return false;
52 }
53 // The type id must correspond to a type.
54 auto type = ir_context->get_type_mgr()->GetType(message_.type_id());
55 if (!type) {
56 return false;
57 }
58 // That type must be a pointer type ...
59 auto pointer_type = type->AsPointer();
60 if (!pointer_type) {
61 return false;
62 }
63 // ... with the right storage class.
64 if (pointer_type->storage_class() != storage_class) {
65 return false;
66 }
67 if (message_.initializer_id()) {
68 // An initializer is not allowed if the storage class is Workgroup.
69 if (storage_class == SpvStorageClassWorkgroup) {
70 assert(false &&
71 "By construction this transformation should not have an "
72 "initializer when Workgroup storage class is used.");
73 return false;
74 }
75 // The initializer id must be the id of a constant. Check this with the
76 // constant manager.
77 auto constant_id = ir_context->get_constant_mgr()->GetConstantsFromIds(
78 {message_.initializer_id()});
79 if (constant_id.empty()) {
80 return false;
81 }
82 assert(constant_id.size() == 1 &&
83 "We asked for the constant associated with a single id; we should "
84 "get a single constant.");
85 // The type of the constant must match the pointee type of the pointer.
86 if (pointer_type->pointee_type() != constant_id[0]->type()) {
87 return false;
88 }
89 }
90 return true;
91 }
92
Apply(opt::IRContext * ir_context,TransformationContext * transformation_context) const93 void TransformationAddGlobalVariable::Apply(
94 opt::IRContext* ir_context,
95 TransformationContext* transformation_context) const {
96 opt::Instruction* new_instruction = fuzzerutil::AddGlobalVariable(
97 ir_context, message_.fresh_id(), message_.type_id(),
98 static_cast<SpvStorageClass>(message_.storage_class()),
99 message_.initializer_id());
100
101 // Inform the def-use manager about the new instruction.
102 ir_context->get_def_use_mgr()->AnalyzeInstDefUse(new_instruction);
103
104 if (message_.value_is_irrelevant()) {
105 transformation_context->GetFactManager()->AddFactValueOfPointeeIsIrrelevant(
106 message_.fresh_id());
107 }
108 }
109
ToMessage() const110 protobufs::Transformation TransformationAddGlobalVariable::ToMessage() const {
111 protobufs::Transformation result;
112 *result.mutable_add_global_variable() = message_;
113 return result;
114 }
115
GetFreshIds() const116 std::unordered_set<uint32_t> TransformationAddGlobalVariable::GetFreshIds()
117 const {
118 return {message_.fresh_id()};
119 }
120
121 } // namespace fuzz
122 } // namespace spvtools
123