mirror of
https://github.com/KhronosGroup/SPIRV-Tools
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90 lines
3.5 KiB
C++
90 lines
3.5 KiB
C++
// Copyright (c) 2019 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "source/fuzz/fuzzer_pass_copy_objects.h"
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#include "source/fuzz/fuzzer_util.h"
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#include "source/fuzz/protobufs/spirvfuzz_protobufs.h"
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#include "source/fuzz/transformation_add_synonym.h"
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namespace spvtools {
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namespace fuzz {
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FuzzerPassCopyObjects::FuzzerPassCopyObjects(
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opt::IRContext* ir_context, TransformationContext* transformation_context,
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FuzzerContext* fuzzer_context,
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protobufs::TransformationSequence* transformations)
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: FuzzerPass(ir_context, transformation_context, fuzzer_context,
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transformations) {}
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FuzzerPassCopyObjects::~FuzzerPassCopyObjects() = default;
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void FuzzerPassCopyObjects::Apply() {
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ForEachInstructionWithInstructionDescriptor(
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[this](opt::Function* function, opt::BasicBlock* block,
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opt::BasicBlock::iterator inst_it,
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const protobufs::InstructionDescriptor& instruction_descriptor)
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-> void {
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assert(inst_it->opcode() ==
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instruction_descriptor.target_instruction_opcode() &&
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"The opcode of the instruction we might insert before must be "
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"the same as the opcode in the descriptor for the instruction");
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if (GetTransformationContext()->GetFactManager()->BlockIsDead(
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block->id())) {
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// Don't create synonyms in dead blocks.
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return;
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}
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// Check whether it is legitimate to insert a copy before this
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// instruction.
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if (!fuzzerutil::CanInsertOpcodeBeforeInstruction(SpvOpCopyObject,
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inst_it)) {
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return;
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}
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// Randomly decide whether to try inserting an object copy here.
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if (!GetFuzzerContext()->ChoosePercentage(
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GetFuzzerContext()->GetChanceOfCopyingObject())) {
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return;
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}
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const auto relevant_instructions = FindAvailableInstructions(
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function, block, inst_it,
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[this](opt::IRContext* ir_context, opt::Instruction* inst) {
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return TransformationAddSynonym::IsInstructionValid(
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ir_context, *GetTransformationContext(), inst,
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protobufs::TransformationAddSynonym::COPY_OBJECT);
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});
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// At this point, |relevant_instructions| contains all the instructions
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// we might think of copying.
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if (relevant_instructions.empty()) {
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return;
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}
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// Choose a copyable instruction at random, and create and apply an
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// object copying transformation based on it.
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ApplyTransformation(TransformationAddSynonym(
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relevant_instructions[GetFuzzerContext()->RandomIndex(
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relevant_instructions)]
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->result_id(),
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protobufs::TransformationAddSynonym::COPY_OBJECT,
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GetFuzzerContext()->GetFreshId(), instruction_descriptor));
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});
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}
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} // namespace fuzz
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} // namespace spvtools
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