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https://github.com/KhronosGroup/SPIRV-Tools
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da4cd21485
Changes FuzzerPass::MaybeAddTransformationBeforeEachInstruction to FuzzerPass::ForEachInstructionWithInstructionDescriptor. Fixes #3184.
96 lines
3.7 KiB
C++
96 lines
3.7 KiB
C++
// Copyright (c) 2020 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_add_loads.h"
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#include "source/fuzz/fuzzer_util.h"
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#include "source/fuzz/transformation_load.h"
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namespace spvtools {
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namespace fuzz {
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FuzzerPassAddLoads::FuzzerPassAddLoads(
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opt::IRContext* ir_context, FactManager* fact_manager,
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FuzzerContext* fuzzer_context,
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protobufs::TransformationSequence* transformations)
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: FuzzerPass(ir_context, fact_manager, fuzzer_context, transformations) {}
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FuzzerPassAddLoads::~FuzzerPassAddLoads() = default;
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void FuzzerPassAddLoads::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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// Check whether it is legitimate to insert a load before this
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// instruction.
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if (!fuzzerutil::CanInsertOpcodeBeforeInstruction(SpvOpLoad, inst_it)) {
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return;
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}
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// Randomly decide whether to try inserting a load here.
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if (!GetFuzzerContext()->ChoosePercentage(
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GetFuzzerContext()->GetChanceOfAddingLoad())) {
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return;
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}
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std::vector<opt::Instruction*> relevant_instructions =
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FindAvailableInstructions(
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function, block, inst_it,
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[](opt::IRContext* context,
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opt::Instruction* instruction) -> bool {
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if (!instruction->result_id() || !instruction->type_id()) {
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return false;
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}
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switch (instruction->result_id()) {
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case SpvOpConstantNull:
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case SpvOpUndef:
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// Do not allow loading from a null or undefined pointer;
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// this might be OK if the block is dead, but for now we
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// conservatively avoid it.
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return false;
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default:
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break;
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}
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return context->get_def_use_mgr()
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->GetDef(instruction->type_id())
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->opcode() == SpvOpTypePointer;
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});
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// At this point, |relevant_instructions| contains all the pointers
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// we might think of loading from.
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if (relevant_instructions.empty()) {
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return;
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}
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// Choose a pointer at random, and create and apply a loading
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// transformation based on it.
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ApplyTransformation(TransformationLoad(
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GetFuzzerContext()->GetFreshId(),
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relevant_instructions[GetFuzzerContext()->RandomIndex(
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relevant_instructions)]
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->result_id(),
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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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