535 lines
21 KiB
C++
535 lines
21 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.h"
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#include <set>
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#include "source/fuzz/fuzzer_util.h"
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#include "source/fuzz/instruction_descriptor.h"
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#include "source/fuzz/transformation_add_constant_boolean.h"
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#include "source/fuzz/transformation_add_constant_composite.h"
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#include "source/fuzz/transformation_add_constant_scalar.h"
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#include "source/fuzz/transformation_add_global_undef.h"
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#include "source/fuzz/transformation_add_type_boolean.h"
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#include "source/fuzz/transformation_add_type_float.h"
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#include "source/fuzz/transformation_add_type_function.h"
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#include "source/fuzz/transformation_add_type_int.h"
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#include "source/fuzz/transformation_add_type_matrix.h"
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#include "source/fuzz/transformation_add_type_pointer.h"
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#include "source/fuzz/transformation_add_type_vector.h"
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namespace spvtools {
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namespace fuzz {
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FuzzerPass::FuzzerPass(opt::IRContext* ir_context,
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TransformationContext* transformation_context,
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FuzzerContext* fuzzer_context,
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protobufs::TransformationSequence* transformations)
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: ir_context_(ir_context),
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transformation_context_(transformation_context),
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fuzzer_context_(fuzzer_context),
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transformations_(transformations) {}
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FuzzerPass::~FuzzerPass() = default;
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std::vector<opt::Instruction*> FuzzerPass::FindAvailableInstructions(
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opt::Function* function, opt::BasicBlock* block,
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const opt::BasicBlock::iterator& inst_it,
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std::function<bool(opt::IRContext*, opt::Instruction*)>
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instruction_is_relevant) const {
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// TODO(afd) The following is (relatively) simple, but may end up being
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// prohibitively inefficient, as it walks the whole dominator tree for
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// every instruction that is considered.
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std::vector<opt::Instruction*> result;
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// Consider all global declarations
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for (auto& global : GetIRContext()->module()->types_values()) {
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if (instruction_is_relevant(GetIRContext(), &global)) {
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result.push_back(&global);
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}
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}
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// Consider all function parameters
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function->ForEachParam(
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[this, &instruction_is_relevant, &result](opt::Instruction* param) {
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if (instruction_is_relevant(GetIRContext(), param)) {
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result.push_back(param);
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}
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});
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// Consider all previous instructions in this block
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for (auto prev_inst_it = block->begin(); prev_inst_it != inst_it;
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++prev_inst_it) {
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if (instruction_is_relevant(GetIRContext(), &*prev_inst_it)) {
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result.push_back(&*prev_inst_it);
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}
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}
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// Walk the dominator tree to consider all instructions from dominating
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// blocks
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auto dominator_analysis = GetIRContext()->GetDominatorAnalysis(function);
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for (auto next_dominator = dominator_analysis->ImmediateDominator(block);
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next_dominator != nullptr;
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next_dominator =
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dominator_analysis->ImmediateDominator(next_dominator)) {
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for (auto& dominating_inst : *next_dominator) {
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if (instruction_is_relevant(GetIRContext(), &dominating_inst)) {
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result.push_back(&dominating_inst);
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}
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}
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}
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return result;
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}
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void FuzzerPass::ForEachInstructionWithInstructionDescriptor(
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std::function<
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void(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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action) {
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// Consider every block in every function.
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for (auto& function : *GetIRContext()->module()) {
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for (auto& block : function) {
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// We now consider every instruction in the block, randomly deciding
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// whether to apply a transformation before it.
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// In order for transformations to insert new instructions, they need to
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// be able to identify the instruction to insert before. We describe an
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// instruction via its opcode, 'opc', a base instruction 'base' that has a
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// result id, and the number of instructions with opcode 'opc' that we
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// should skip when searching from 'base' for the desired instruction.
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// (An instruction that has a result id is represented by its own opcode,
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// itself as 'base', and a skip-count of 0.)
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std::vector<std::tuple<uint32_t, SpvOp, uint32_t>>
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base_opcode_skip_triples;
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// The initial base instruction is the block label.
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uint32_t base = block.id();
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// Counts the number of times we have seen each opcode since we reset the
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// base instruction.
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std::map<SpvOp, uint32_t> skip_count;
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// Consider every instruction in the block. The label is excluded: it is
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// only necessary to consider it as a base in case the first instruction
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// in the block does not have a result id.
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for (auto inst_it = block.begin(); inst_it != block.end(); ++inst_it) {
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if (inst_it->HasResultId()) {
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// In the case that the instruction has a result id, we use the
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// instruction as its own base, and clear the skip counts we have
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// collected.
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base = inst_it->result_id();
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skip_count.clear();
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}
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const SpvOp opcode = inst_it->opcode();
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// Invoke the provided function, which might apply a transformation.
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action(&function, &block, inst_it,
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MakeInstructionDescriptor(
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base, opcode,
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skip_count.count(opcode) ? skip_count.at(opcode) : 0));
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if (!inst_it->HasResultId()) {
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skip_count[opcode] =
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skip_count.count(opcode) ? skip_count.at(opcode) + 1 : 1;
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}
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}
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}
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}
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}
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uint32_t FuzzerPass::FindOrCreateBoolType() {
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opt::analysis::Bool bool_type;
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auto existing_id = GetIRContext()->get_type_mgr()->GetId(&bool_type);
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if (existing_id) {
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return existing_id;
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}
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auto result = GetFuzzerContext()->GetFreshId();
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ApplyTransformation(TransformationAddTypeBoolean(result));
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return result;
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}
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uint32_t FuzzerPass::FindOrCreate32BitIntegerType(bool is_signed) {
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opt::analysis::Integer int_type(32, is_signed);
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auto existing_id = GetIRContext()->get_type_mgr()->GetId(&int_type);
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if (existing_id) {
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return existing_id;
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}
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auto result = GetFuzzerContext()->GetFreshId();
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ApplyTransformation(TransformationAddTypeInt(result, 32, is_signed));
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return result;
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}
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uint32_t FuzzerPass::FindOrCreate32BitFloatType() {
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opt::analysis::Float float_type(32);
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auto existing_id = GetIRContext()->get_type_mgr()->GetId(&float_type);
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if (existing_id) {
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return existing_id;
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}
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auto result = GetFuzzerContext()->GetFreshId();
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ApplyTransformation(TransformationAddTypeFloat(result, 32));
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return result;
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}
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uint32_t FuzzerPass::FindOrCreateFunctionType(
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uint32_t return_type_id, const std::vector<uint32_t>& argument_id) {
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// FindFunctionType has a sigle argument for OpTypeFunction operands
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// so we will have to copy them all in this vector
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std::vector<uint32_t> type_ids(argument_id.size() + 1);
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type_ids[0] = return_type_id;
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std::copy(argument_id.begin(), argument_id.end(), type_ids.begin() + 1);
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// Check if type exists
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auto existing_id = fuzzerutil::FindFunctionType(GetIRContext(), type_ids);
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if (existing_id) {
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return existing_id;
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}
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auto result = GetFuzzerContext()->GetFreshId();
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ApplyTransformation(
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TransformationAddTypeFunction(result, return_type_id, argument_id));
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return result;
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}
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uint32_t FuzzerPass::FindOrCreateVectorType(uint32_t component_type_id,
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uint32_t component_count) {
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assert(component_count >= 2 && component_count <= 4 &&
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"Precondition: component count must be in range [2, 4].");
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opt::analysis::Type* component_type =
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GetIRContext()->get_type_mgr()->GetType(component_type_id);
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assert(component_type && "Precondition: the component type must exist.");
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opt::analysis::Vector vector_type(component_type, component_count);
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auto existing_id = GetIRContext()->get_type_mgr()->GetId(&vector_type);
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if (existing_id) {
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return existing_id;
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}
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auto result = GetFuzzerContext()->GetFreshId();
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ApplyTransformation(
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TransformationAddTypeVector(result, component_type_id, component_count));
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return result;
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}
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uint32_t FuzzerPass::FindOrCreateMatrixType(uint32_t column_count,
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uint32_t row_count) {
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assert(column_count >= 2 && column_count <= 4 &&
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"Precondition: column count must be in range [2, 4].");
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assert(row_count >= 2 && row_count <= 4 &&
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"Precondition: row count must be in range [2, 4].");
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uint32_t column_type_id =
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FindOrCreateVectorType(FindOrCreate32BitFloatType(), row_count);
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opt::analysis::Type* column_type =
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GetIRContext()->get_type_mgr()->GetType(column_type_id);
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opt::analysis::Matrix matrix_type(column_type, column_count);
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auto existing_id = GetIRContext()->get_type_mgr()->GetId(&matrix_type);
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if (existing_id) {
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return existing_id;
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}
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auto result = GetFuzzerContext()->GetFreshId();
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ApplyTransformation(
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TransformationAddTypeMatrix(result, column_type_id, column_count));
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return result;
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}
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uint32_t FuzzerPass::FindOrCreatePointerType(uint32_t base_type_id,
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SpvStorageClass storage_class) {
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// We do not use the type manager here, due to problems related to isomorphic
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// but distinct structs not being regarded as different.
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auto existing_id = fuzzerutil::MaybeGetPointerType(
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GetIRContext(), base_type_id, storage_class);
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if (existing_id) {
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return existing_id;
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}
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auto result = GetFuzzerContext()->GetFreshId();
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ApplyTransformation(
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TransformationAddTypePointer(result, storage_class, base_type_id));
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return result;
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}
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uint32_t FuzzerPass::FindOrCreatePointerTo32BitIntegerType(
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bool is_signed, SpvStorageClass storage_class) {
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return FindOrCreatePointerType(FindOrCreate32BitIntegerType(is_signed),
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storage_class);
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}
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uint32_t FuzzerPass::FindOrCreate32BitIntegerConstant(uint32_t word,
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bool is_signed) {
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auto uint32_type_id = FindOrCreate32BitIntegerType(is_signed);
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opt::analysis::IntConstant int_constant(
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GetIRContext()->get_type_mgr()->GetType(uint32_type_id)->AsInteger(),
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{word});
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auto existing_constant =
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GetIRContext()->get_constant_mgr()->FindConstant(&int_constant);
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if (existing_constant) {
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return GetIRContext()
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->get_constant_mgr()
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->GetDefiningInstruction(existing_constant)
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->result_id();
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}
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auto result = GetFuzzerContext()->GetFreshId();
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ApplyTransformation(
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TransformationAddConstantScalar(result, uint32_type_id, {word}));
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return result;
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}
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uint32_t FuzzerPass::FindOrCreate32BitFloatConstant(uint32_t word) {
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auto float_type_id = FindOrCreate32BitFloatType();
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opt::analysis::FloatConstant float_constant(
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GetIRContext()->get_type_mgr()->GetType(float_type_id)->AsFloat(),
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{word});
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auto existing_constant =
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GetIRContext()->get_constant_mgr()->FindConstant(&float_constant);
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if (existing_constant) {
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return GetIRContext()
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->get_constant_mgr()
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->GetDefiningInstruction(existing_constant)
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->result_id();
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}
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auto result = GetFuzzerContext()->GetFreshId();
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ApplyTransformation(
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TransformationAddConstantScalar(result, float_type_id, {word}));
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return result;
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}
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uint32_t FuzzerPass::FindOrCreateBoolConstant(bool value) {
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auto bool_type_id = FindOrCreateBoolType();
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opt::analysis::BoolConstant bool_constant(
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GetIRContext()->get_type_mgr()->GetType(bool_type_id)->AsBool(), value);
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auto existing_constant =
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GetIRContext()->get_constant_mgr()->FindConstant(&bool_constant);
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if (existing_constant) {
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return GetIRContext()
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->get_constant_mgr()
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->GetDefiningInstruction(existing_constant)
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->result_id();
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}
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auto result = GetFuzzerContext()->GetFreshId();
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ApplyTransformation(TransformationAddConstantBoolean(result, value));
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return result;
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}
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uint32_t FuzzerPass::FindOrCreateConstant(const std::vector<uint32_t>& words,
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uint32_t type_id) {
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assert(type_id && "Constant's type id can't be 0.");
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const auto* type = GetIRContext()->get_type_mgr()->GetType(type_id);
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assert(type && "Type does not exist.");
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if (type->AsBool()) {
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assert(words.size() == 1);
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return FindOrCreateBoolConstant(words[0]);
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} else if (const auto* integer = type->AsInteger()) {
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assert(integer->width() == 32 && words.size() == 1 &&
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"Integer must have 32-bit width");
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return FindOrCreate32BitIntegerConstant(words[0], integer->IsSigned());
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} else if (const auto* floating = type->AsFloat()) {
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// Assertions are not evaluated in release builds so |floating|
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// variable will be unused.
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(void)floating;
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assert(floating->width() == 32 && words.size() == 1 &&
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"Floating point number must have 32-bit width");
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return FindOrCreate32BitFloatConstant(words[0]);
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}
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// This assertion will fail in debug build but not in release build
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// so we return 0 to make compiler happy.
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assert(false && "Constant type is not supported");
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return 0;
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}
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uint32_t FuzzerPass::FindOrCreateGlobalUndef(uint32_t type_id) {
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for (auto& inst : GetIRContext()->types_values()) {
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if (inst.opcode() == SpvOpUndef && inst.type_id() == type_id) {
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return inst.result_id();
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}
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}
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auto result = GetFuzzerContext()->GetFreshId();
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ApplyTransformation(TransformationAddGlobalUndef(result, type_id));
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return result;
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}
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std::pair<std::vector<uint32_t>, std::map<uint32_t, std::vector<uint32_t>>>
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FuzzerPass::GetAvailableBasicTypesAndPointers(
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SpvStorageClass storage_class) const {
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// Records all of the basic types available in the module.
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std::set<uint32_t> basic_types;
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// For each basic type, records all the associated pointer types that target
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// the basic type and that have |storage_class| as their storage class.
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std::map<uint32_t, std::vector<uint32_t>> basic_type_to_pointers;
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for (auto& inst : GetIRContext()->types_values()) {
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// For each basic type that we come across, record type, and the fact that
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// we cannot yet have seen any pointers that use the basic type as its
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// pointee type.
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//
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// For pointer types with basic pointee types, associate the pointer type
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// with the basic type.
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switch (inst.opcode()) {
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case SpvOpTypeBool:
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case SpvOpTypeFloat:
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case SpvOpTypeInt:
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case SpvOpTypeMatrix:
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case SpvOpTypeVector:
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// These are all basic types.
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basic_types.insert(inst.result_id());
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basic_type_to_pointers.insert({inst.result_id(), {}});
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break;
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case SpvOpTypeArray:
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// An array type is basic if its base type is basic.
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if (basic_types.count(inst.GetSingleWordInOperand(0))) {
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basic_types.insert(inst.result_id());
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basic_type_to_pointers.insert({inst.result_id(), {}});
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}
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break;
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case SpvOpTypeStruct: {
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// A struct type is basic if all of its members are basic.
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bool all_members_are_basic_types = true;
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for (uint32_t i = 0; i < inst.NumInOperands(); i++) {
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if (!basic_types.count(inst.GetSingleWordInOperand(i))) {
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all_members_are_basic_types = false;
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break;
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}
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}
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if (all_members_are_basic_types) {
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basic_types.insert(inst.result_id());
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basic_type_to_pointers.insert({inst.result_id(), {}});
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}
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break;
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}
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case SpvOpTypePointer: {
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// We are interested in the pointer if its pointee type is basic and it
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// has the right storage class.
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auto pointee_type = inst.GetSingleWordInOperand(1);
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if (inst.GetSingleWordInOperand(0) == storage_class &&
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basic_types.count(pointee_type)) {
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// The pointer has the desired storage class, and its pointee type is
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// a basic type, so we are interested in it. Associate it with its
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// basic type.
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basic_type_to_pointers.at(pointee_type).push_back(inst.result_id());
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}
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break;
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}
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default:
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break;
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}
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}
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return {{basic_types.begin(), basic_types.end()}, basic_type_to_pointers};
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}
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uint32_t FuzzerPass::FindOrCreateZeroConstant(
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uint32_t scalar_or_composite_type_id) {
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auto type_instruction =
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GetIRContext()->get_def_use_mgr()->GetDef(scalar_or_composite_type_id);
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assert(type_instruction && "The type instruction must exist.");
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switch (type_instruction->opcode()) {
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case SpvOpTypeBool:
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return FindOrCreateBoolConstant(false);
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case SpvOpTypeFloat:
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return FindOrCreate32BitFloatConstant(0);
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case SpvOpTypeInt:
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return FindOrCreate32BitIntegerConstant(
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0, type_instruction->GetSingleWordInOperand(1) != 0);
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case SpvOpTypeArray: {
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return GetZeroConstantForHomogeneousComposite(
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*type_instruction, type_instruction->GetSingleWordInOperand(0),
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fuzzerutil::GetArraySize(*type_instruction, GetIRContext()));
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}
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case SpvOpTypeMatrix:
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case SpvOpTypeVector: {
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return GetZeroConstantForHomogeneousComposite(
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*type_instruction, type_instruction->GetSingleWordInOperand(0),
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type_instruction->GetSingleWordInOperand(1));
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}
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case SpvOpTypeStruct: {
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std::vector<const opt::analysis::Constant*> field_zero_constants;
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std::vector<uint32_t> field_zero_ids;
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for (uint32_t index = 0; index < type_instruction->NumInOperands();
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index++) {
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uint32_t field_constant_id = FindOrCreateZeroConstant(
|
|
type_instruction->GetSingleWordInOperand(index));
|
|
field_zero_ids.push_back(field_constant_id);
|
|
field_zero_constants.push_back(
|
|
GetIRContext()->get_constant_mgr()->FindDeclaredConstant(
|
|
field_constant_id));
|
|
}
|
|
return FindOrCreateCompositeConstant(
|
|
*type_instruction, field_zero_constants, field_zero_ids);
|
|
}
|
|
default:
|
|
assert(false && "Unknown type.");
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
uint32_t FuzzerPass::FindOrCreateCompositeConstant(
|
|
const opt::Instruction& composite_type_instruction,
|
|
const std::vector<const opt::analysis::Constant*>& constants,
|
|
const std::vector<uint32_t>& constant_ids) {
|
|
assert(constants.size() == constant_ids.size() &&
|
|
"Precondition: |constants| and |constant_ids| must be in "
|
|
"correspondence.");
|
|
|
|
opt::analysis::Type* composite_type = GetIRContext()->get_type_mgr()->GetType(
|
|
composite_type_instruction.result_id());
|
|
std::unique_ptr<opt::analysis::Constant> composite_constant;
|
|
if (composite_type->AsArray()) {
|
|
composite_constant = MakeUnique<opt::analysis::ArrayConstant>(
|
|
composite_type->AsArray(), constants);
|
|
} else if (composite_type->AsMatrix()) {
|
|
composite_constant = MakeUnique<opt::analysis::MatrixConstant>(
|
|
composite_type->AsMatrix(), constants);
|
|
} else if (composite_type->AsStruct()) {
|
|
composite_constant = MakeUnique<opt::analysis::StructConstant>(
|
|
composite_type->AsStruct(), constants);
|
|
} else if (composite_type->AsVector()) {
|
|
composite_constant = MakeUnique<opt::analysis::VectorConstant>(
|
|
composite_type->AsVector(), constants);
|
|
} else {
|
|
assert(false &&
|
|
"Precondition: |composite_type| must declare a composite type.");
|
|
return 0;
|
|
}
|
|
|
|
uint32_t existing_constant =
|
|
GetIRContext()->get_constant_mgr()->FindDeclaredConstant(
|
|
composite_constant.get(), composite_type_instruction.result_id());
|
|
if (existing_constant) {
|
|
return existing_constant;
|
|
}
|
|
uint32_t result = GetFuzzerContext()->GetFreshId();
|
|
ApplyTransformation(TransformationAddConstantComposite(
|
|
result, composite_type_instruction.result_id(), constant_ids));
|
|
return result;
|
|
}
|
|
|
|
uint32_t FuzzerPass::GetZeroConstantForHomogeneousComposite(
|
|
const opt::Instruction& composite_type_instruction,
|
|
uint32_t component_type_id, uint32_t num_components) {
|
|
std::vector<const opt::analysis::Constant*> zero_constants;
|
|
std::vector<uint32_t> zero_ids;
|
|
uint32_t zero_component = FindOrCreateZeroConstant(component_type_id);
|
|
const opt::analysis::Constant* registered_zero_component =
|
|
GetIRContext()->get_constant_mgr()->FindDeclaredConstant(zero_component);
|
|
for (uint32_t i = 0; i < num_components; i++) {
|
|
zero_constants.push_back(registered_zero_component);
|
|
zero_ids.push_back(zero_component);
|
|
}
|
|
return FindOrCreateCompositeConstant(composite_type_instruction,
|
|
zero_constants, zero_ids);
|
|
}
|
|
|
|
} // namespace fuzz
|
|
} // namespace spvtools
|