1 // Copyright (c) 2020 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_early_terminator_wrapper.h"
16
17 #include "source/fuzz/fuzzer_util.h"
18 #include "source/util/make_unique.h"
19
20 namespace spvtools {
21 namespace fuzz {
22
23 TransformationAddEarlyTerminatorWrapper::
TransformationAddEarlyTerminatorWrapper(protobufs::TransformationAddEarlyTerminatorWrapper message)24 TransformationAddEarlyTerminatorWrapper(
25 protobufs::TransformationAddEarlyTerminatorWrapper message)
26 : message_(std::move(message)) {}
27
28 TransformationAddEarlyTerminatorWrapper::
TransformationAddEarlyTerminatorWrapper(uint32_t function_fresh_id,uint32_t label_fresh_id,spv::Op opcode)29 TransformationAddEarlyTerminatorWrapper(uint32_t function_fresh_id,
30 uint32_t label_fresh_id,
31 spv::Op opcode) {
32 message_.set_function_fresh_id(function_fresh_id);
33 message_.set_label_fresh_id(label_fresh_id);
34 message_.set_opcode(uint32_t(opcode));
35 }
36
IsApplicable(opt::IRContext * ir_context,const TransformationContext &) const37 bool TransformationAddEarlyTerminatorWrapper::IsApplicable(
38 opt::IRContext* ir_context, const TransformationContext& /*unused*/) const {
39 assert((spv::Op(message_.opcode()) == spv::Op::OpKill ||
40 spv::Op(message_.opcode()) == spv::Op::OpUnreachable ||
41 spv::Op(message_.opcode()) == spv::Op::OpTerminateInvocation) &&
42 "Invalid opcode.");
43
44 if (!fuzzerutil::IsFreshId(ir_context, message_.function_fresh_id())) {
45 return false;
46 }
47 if (!fuzzerutil::IsFreshId(ir_context, message_.label_fresh_id())) {
48 return false;
49 }
50 if (message_.function_fresh_id() == message_.label_fresh_id()) {
51 return false;
52 }
53 uint32_t void_type_id = fuzzerutil::MaybeGetVoidType(ir_context);
54 if (!void_type_id) {
55 return false;
56 }
57 return fuzzerutil::FindFunctionType(ir_context, {void_type_id});
58 }
59
Apply(opt::IRContext * ir_context,TransformationContext *) const60 void TransformationAddEarlyTerminatorWrapper::Apply(
61 opt::IRContext* ir_context, TransformationContext* /*unused*/) const {
62 fuzzerutil::UpdateModuleIdBound(ir_context, message_.function_fresh_id());
63 fuzzerutil::UpdateModuleIdBound(ir_context, message_.label_fresh_id());
64
65 // Create a basic block of the form:
66 // %label_fresh_id = OpLabel
67 // OpKill|Unreachable|TerminateInvocation
68 auto basic_block = MakeUnique<opt::BasicBlock>(MakeUnique<opt::Instruction>(
69 ir_context, spv::Op::OpLabel, 0, message_.label_fresh_id(),
70 opt::Instruction::OperandList()));
71 basic_block->AddInstruction(MakeUnique<opt::Instruction>(
72 ir_context, static_cast<spv::Op>(message_.opcode()), 0, 0,
73 opt::Instruction::OperandList()));
74
75 // Create a zero-argument void function.
76 auto void_type_id = fuzzerutil::MaybeGetVoidType(ir_context);
77 auto function = MakeUnique<opt::Function>(MakeUnique<opt::Instruction>(
78 ir_context, spv::Op::OpFunction, void_type_id,
79 message_.function_fresh_id(),
80 opt::Instruction::OperandList(
81 {{SPV_OPERAND_TYPE_FUNCTION_CONTROL,
82 {uint32_t(spv::FunctionControlMask::MaskNone)}},
83 {SPV_OPERAND_TYPE_TYPE_ID,
84 {fuzzerutil::FindFunctionType(ir_context, {void_type_id})}}})));
85
86 // Add the basic block to the function as the sole block, and add the function
87 // to the module.
88 function->AddBasicBlock(std::move(basic_block));
89 function->SetFunctionEnd(
90 MakeUnique<opt::Instruction>(ir_context, spv::Op::OpFunctionEnd, 0, 0,
91 opt::Instruction::OperandList()));
92 ir_context->module()->AddFunction(std::move(function));
93
94 ir_context->InvalidateAnalysesExceptFor(opt::IRContext::kAnalysisNone);
95 }
96
97 std::unordered_set<uint32_t>
GetFreshIds() const98 TransformationAddEarlyTerminatorWrapper::GetFreshIds() const {
99 return std::unordered_set<uint32_t>(
100 {message_.function_fresh_id(), message_.label_fresh_id()});
101 }
102
ToMessage() const103 protobufs::Transformation TransformationAddEarlyTerminatorWrapper::ToMessage()
104 const {
105 protobufs::Transformation result;
106 *result.mutable_add_early_terminator_wrapper() = message_;
107 return result;
108 }
109
110 } // namespace fuzz
111 } // namespace spvtools
112