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https://github.com/KhronosGroup/SPIRV-Tools
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8d4261bc44
Some transformations (e.g. TransformationAddFunction) rely on running the validator to decide whether the transformation is applicable. A recent change allowed spirv-fuzz to take validator options, to cater for the case where a module should be considered valid under particular conditions. However, validation during the checking of transformations had no access to these validator options. This change introduced TransformationContext, which currently consists of a fact manager and a set of validator options, but could in the future have other fields corresponding to other objects that it is useful to have access to when applying transformations. Now, instead of checking and applying transformations in the context of a FactManager, a TransformationContext is used. This gives access to the fact manager as before, and also access to the validator options when they are needed.
97 lines
3.7 KiB
C++
97 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, 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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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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