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https://github.com/KhronosGroup/SPIRV-Tools
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61e256c9c4
FuzzerPassConstructComposites is adapted to use AvailableInstructions to manage available instructions, and to use zero constants when trying to construct a composite for which not all fields can otherwise be constructed. The change uncovered some cases where we create structs and arrays with struct fields or components that are block-decorated; these possibilities have been eliminated.
351 lines
15 KiB
C++
351 lines
15 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_construct_composites.h"
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#include <memory>
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#include "source/fuzz/available_instructions.h"
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#include "source/fuzz/fuzzer_util.h"
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#include "source/fuzz/transformation_composite_construct.h"
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namespace spvtools {
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namespace fuzz {
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FuzzerPassConstructComposites::FuzzerPassConstructComposites(
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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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void FuzzerPassConstructComposites::Apply() {
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// Gather up the ids of all composite types, but skip block-/buffer
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// block-decorated struct types.
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std::vector<uint32_t> composite_type_ids;
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for (auto& inst : GetIRContext()->types_values()) {
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if (fuzzerutil::IsCompositeType(
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GetIRContext()->get_type_mgr()->GetType(inst.result_id())) &&
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!fuzzerutil::HasBlockOrBufferBlockDecoration(GetIRContext(),
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inst.result_id())) {
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composite_type_ids.push_back(inst.result_id());
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}
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}
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if (composite_type_ids.empty()) {
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// There are no composite types, so this fuzzer pass cannot do anything.
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return;
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}
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AvailableInstructions available_composite_constituents(
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GetIRContext(),
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[this](opt::IRContext* ir_context, opt::Instruction* inst) -> bool {
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if (!inst->result_id() || !inst->type_id()) {
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return false;
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}
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// If the id is irrelevant, we can use it since it will not
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// participate in DataSynonym fact. Otherwise, we should be able
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// to produce a synonym out of the id.
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return GetTransformationContext()->GetFactManager()->IdIsIrrelevant(
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inst->result_id()) ||
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fuzzerutil::CanMakeSynonymOf(ir_context,
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*GetTransformationContext(), inst);
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});
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ForEachInstructionWithInstructionDescriptor(
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[this, &available_composite_constituents, &composite_type_ids](
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opt::Function* /*unused*/, opt::BasicBlock* /*unused*/,
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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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// Randomly decide whether to try inserting a composite construction
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// here.
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if (!GetFuzzerContext()->ChoosePercentage(
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GetFuzzerContext()->GetChanceOfConstructingComposite())) {
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return;
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}
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// Check whether it is legitimate to insert a composite construction
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// before the instruction.
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if (!fuzzerutil::CanInsertOpcodeBeforeInstruction(
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SpvOpCompositeConstruct, inst_it)) {
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return;
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}
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// For each instruction that is available at this program point (i.e. an
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// instruction that is global or whose definition strictly dominates the
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// program point) and suitable for making a synonym of, associate it
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// with the id of its result type.
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TypeIdToInstructions type_id_to_available_instructions;
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auto available_instructions =
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available_composite_constituents.GetAvailableBeforeInstruction(
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&*inst_it);
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for (uint32_t available_instruction_index = 0;
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available_instruction_index < available_instructions.size();
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available_instruction_index++) {
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opt::Instruction* inst =
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available_instructions[available_instruction_index];
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type_id_to_available_instructions[inst->type_id()].push_back(
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inst->result_id());
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}
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// At this point, |composite_type_ids| captures all the composite types
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// we could try to create, while |type_id_to_available_instructions|
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// captures all the available result ids we might use, organized by
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// type.
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// Now we choose a composite type to construct, building it from
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// available constituent components and using zero constants if suitable
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// components are not available.
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std::vector<uint32_t> constructor_arguments;
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uint32_t chosen_composite_type =
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composite_type_ids[GetFuzzerContext()->RandomIndex(
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composite_type_ids)];
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// Construct a composite of this type, using an appropriate helper
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// method depending on the kind of composite type.
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auto composite_type_inst =
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GetIRContext()->get_def_use_mgr()->GetDef(chosen_composite_type);
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switch (composite_type_inst->opcode()) {
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case SpvOpTypeArray:
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constructor_arguments = FindComponentsToConstructArray(
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*composite_type_inst, type_id_to_available_instructions);
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break;
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case SpvOpTypeMatrix:
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constructor_arguments = FindComponentsToConstructMatrix(
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*composite_type_inst, type_id_to_available_instructions);
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break;
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case SpvOpTypeStruct:
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constructor_arguments = FindComponentsToConstructStruct(
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*composite_type_inst, type_id_to_available_instructions);
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break;
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case SpvOpTypeVector:
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constructor_arguments = FindComponentsToConstructVector(
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*composite_type_inst, type_id_to_available_instructions);
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break;
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default:
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assert(false &&
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"The space of possible composite types should be covered "
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"by the above cases.");
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break;
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}
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assert(!constructor_arguments.empty());
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// Make and apply a transformation.
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ApplyTransformation(TransformationCompositeConstruct(
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chosen_composite_type, constructor_arguments,
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instruction_descriptor, GetFuzzerContext()->GetFreshId()));
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});
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}
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std::vector<uint32_t>
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FuzzerPassConstructComposites::FindComponentsToConstructArray(
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const opt::Instruction& array_type_instruction,
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const TypeIdToInstructions& type_id_to_available_instructions) {
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assert(array_type_instruction.opcode() == SpvOpTypeArray &&
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"Precondition: instruction must be an array type.");
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// Get the element type for the array.
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auto element_type_id = array_type_instruction.GetSingleWordInOperand(0);
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// Get all instructions at our disposal that compute something of this element
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// type.
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auto available_instructions =
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type_id_to_available_instructions.find(element_type_id);
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uint32_t array_length =
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GetIRContext()
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->get_def_use_mgr()
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->GetDef(array_type_instruction.GetSingleWordInOperand(1))
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->GetSingleWordInOperand(0);
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std::vector<uint32_t> result;
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for (uint32_t index = 0; index < array_length; index++) {
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if (available_instructions == type_id_to_available_instructions.cend()) {
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// No suitable instructions are available, so use a zero constant
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result.push_back(FindOrCreateZeroConstant(element_type_id, true));
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} else {
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result.push_back(
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available_instructions->second[GetFuzzerContext()->RandomIndex(
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available_instructions->second)]);
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}
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}
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return result;
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}
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std::vector<uint32_t>
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FuzzerPassConstructComposites::FindComponentsToConstructMatrix(
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const opt::Instruction& matrix_type_instruction,
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const TypeIdToInstructions& type_id_to_available_instructions) {
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assert(matrix_type_instruction.opcode() == SpvOpTypeMatrix &&
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"Precondition: instruction must be a matrix type.");
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// Get the element type for the matrix.
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auto element_type_id = matrix_type_instruction.GetSingleWordInOperand(0);
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// Get all instructions at our disposal that compute something of this element
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// type.
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auto available_instructions =
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type_id_to_available_instructions.find(element_type_id);
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std::vector<uint32_t> result;
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for (uint32_t index = 0;
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index < matrix_type_instruction.GetSingleWordInOperand(1); index++) {
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if (available_instructions == type_id_to_available_instructions.cend()) {
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// No suitable components are available, so use a zero constant.
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result.push_back(FindOrCreateZeroConstant(element_type_id, true));
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} else {
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result.push_back(
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available_instructions->second[GetFuzzerContext()->RandomIndex(
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available_instructions->second)]);
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}
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}
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return result;
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}
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std::vector<uint32_t>
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FuzzerPassConstructComposites::FindComponentsToConstructStruct(
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const opt::Instruction& struct_type_instruction,
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const TypeIdToInstructions& type_id_to_available_instructions) {
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assert(struct_type_instruction.opcode() == SpvOpTypeStruct &&
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"Precondition: instruction must be a struct type.");
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std::vector<uint32_t> result;
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// Consider the type of each field of the struct.
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for (uint32_t in_operand_index = 0;
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in_operand_index < struct_type_instruction.NumInOperands();
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in_operand_index++) {
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auto element_type_id =
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struct_type_instruction.GetSingleWordInOperand(in_operand_index);
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// Find the instructions at our disposal that compute something of the field
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// type.
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auto available_instructions =
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type_id_to_available_instructions.find(element_type_id);
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if (available_instructions == type_id_to_available_instructions.cend()) {
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// No suitable component is available for this element type, so use a zero
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// constant.
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result.push_back(FindOrCreateZeroConstant(element_type_id, true));
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} else {
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result.push_back(
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available_instructions->second[GetFuzzerContext()->RandomIndex(
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available_instructions->second)]);
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}
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}
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return result;
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}
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std::vector<uint32_t>
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FuzzerPassConstructComposites::FindComponentsToConstructVector(
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const opt::Instruction& vector_type_instruction,
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const TypeIdToInstructions& type_id_to_available_instructions) {
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assert(vector_type_instruction.opcode() == SpvOpTypeVector &&
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"Precondition: instruction must be a vector type.");
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// Get details of the type underlying the vector, and the width of the vector,
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// for convenience.
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auto element_type_id = vector_type_instruction.GetSingleWordInOperand(0);
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auto element_type = GetIRContext()->get_type_mgr()->GetType(element_type_id);
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auto element_count = vector_type_instruction.GetSingleWordInOperand(1);
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// Collect a mapping, from type id to width, for scalar/vector types that are
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// smaller in width than |vector_type|, but that have the same underlying
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// type. For example, if |vector_type| is vec4, the mapping will be:
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// { float -> 1, vec2 -> 2, vec3 -> 3 }
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// The mapping will have missing entries if some of these types do not exist.
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std::map<uint32_t, uint32_t> smaller_vector_type_id_to_width;
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// Add the underlying type. This id must exist, in order for |vector_type| to
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// exist.
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smaller_vector_type_id_to_width[element_type_id] = 1;
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// Now add every vector type with width at least 2, and less than the width of
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// |vector_type|.
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for (uint32_t width = 2; width < element_count; width++) {
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opt::analysis::Vector smaller_vector_type(element_type, width);
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auto smaller_vector_type_id =
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GetIRContext()->get_type_mgr()->GetId(&smaller_vector_type);
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// We might find that there is no declared type of this smaller width.
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// For example, a module can declare vec4 without having declared vec2 or
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// vec3.
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if (smaller_vector_type_id) {
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smaller_vector_type_id_to_width[smaller_vector_type_id] = width;
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}
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}
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// Now we know the types that are available to us, we set about populating a
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// vector of the right length. We do this by deciding, with no order in mind,
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// which instructions we will use to populate the vector, and subsequently
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// randomly choosing an order. This is to avoid biasing construction of
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// vectors with smaller vectors to the left and scalars to the right. That is
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// a concern because, e.g. in the case of populating a vec4, if we populate
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// the constructor instructions left-to-right, we can always choose a vec3 to
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// construct the first three elements, but can only choose a vec3 to construct
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// the last three elements if we chose a float to construct the first element
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// (otherwise there will not be space left for a vec3).
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uint32_t vector_slots_used = 0;
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// The instructions result ids we will use to construct the vector, in no
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// particular order at this stage.
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std::vector<uint32_t> result;
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while (vector_slots_used < element_count) {
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std::vector<uint32_t> instructions_to_choose_from;
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for (auto& entry : smaller_vector_type_id_to_width) {
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if (entry.second >
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std::min(element_count - 1, element_count - vector_slots_used)) {
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continue;
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}
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auto available_instructions =
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type_id_to_available_instructions.find(entry.first);
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if (available_instructions == type_id_to_available_instructions.cend()) {
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continue;
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}
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instructions_to_choose_from.insert(instructions_to_choose_from.end(),
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available_instructions->second.begin(),
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available_instructions->second.end());
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}
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// If there are no instructions to choose from then use a zero constant,
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// otherwise select one of the instructions at random.
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uint32_t id_of_instruction_to_use =
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instructions_to_choose_from.empty()
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? FindOrCreateZeroConstant(element_type_id, true)
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: instructions_to_choose_from[GetFuzzerContext()->RandomIndex(
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instructions_to_choose_from)];
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opt::Instruction* instruction_to_use =
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GetIRContext()->get_def_use_mgr()->GetDef(id_of_instruction_to_use);
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result.push_back(instruction_to_use->result_id());
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auto chosen_type =
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GetIRContext()->get_type_mgr()->GetType(instruction_to_use->type_id());
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if (chosen_type->AsVector()) {
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assert(chosen_type->AsVector()->element_type() == element_type);
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assert(chosen_type->AsVector()->element_count() < element_count);
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assert(chosen_type->AsVector()->element_count() <=
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element_count - vector_slots_used);
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vector_slots_used += chosen_type->AsVector()->element_count();
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} else {
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assert(chosen_type == element_type);
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vector_slots_used += 1;
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}
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}
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assert(vector_slots_used == element_count);
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GetFuzzerContext()->Shuffle(&result);
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return result;
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}
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} // namespace fuzz
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} // namespace spvtools
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