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https://github.com/KhronosGroup/SPIRV-Tools
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620197bd65
This new pass adds some basic ingredients to a module on which future passes are likely to depend, such as boolean constants and some specfic integer and floating-point values. This is not a fuzzer pass in the true sense in that it does not employ randomization, but it makes sense to define it as a fuzzer pass since it is the first of a number of transformations passes that the fuzzer will run on a module.
84 lines
2.8 KiB
C++
84 lines
2.8 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/transformation_add_constant_scalar.h"
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#include "source/fuzz/fuzzer_util.h"
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namespace spvtools {
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namespace fuzz {
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namespace transformation {
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using opt::IRContext;
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bool IsApplicable(const protobufs::TransformationAddConstantScalar& message,
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IRContext* context,
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const spvtools::fuzz::FactManager& /*unused*/) {
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// The id needs to be fresh.
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if (!fuzzerutil::IsFreshId(context, message.fresh_id())) {
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return false;
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}
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// The type id for the scalar must exist and be a type.
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auto type = context->get_type_mgr()->GetType(message.type_id());
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if (!type) {
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return false;
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}
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uint32_t width;
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if (type->AsFloat()) {
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width = type->AsFloat()->width();
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} else if (type->AsInteger()) {
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width = type->AsInteger()->width();
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} else {
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return false;
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}
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// The number of words is the integer floor of the width.
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auto words = (width + 32 - 1) / 32;
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// The number of words provided by the transformation needs to match the
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// width of the type.
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return static_cast<uint32_t>(message.word().size()) == words;
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}
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void Apply(const protobufs::TransformationAddConstantScalar& message,
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IRContext* context, spvtools::fuzz::FactManager* /*unused*/) {
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opt::Instruction::OperandList operand_list;
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for (auto word : message.word()) {
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operand_list.push_back({SPV_OPERAND_TYPE_LITERAL_INTEGER, {word}});
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}
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context->module()->AddGlobalValue(
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MakeUnique<opt::Instruction>(context, SpvOpConstant, message.type_id(),
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message.fresh_id(), operand_list));
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fuzzerutil::UpdateModuleIdBound(context, message.fresh_id());
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// We have added an instruction to the module, so need to be careful about the
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// validity of existing analyses.
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context->InvalidateAnalysesExceptFor(IRContext::Analysis::kAnalysisNone);
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}
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protobufs::TransformationAddConstantScalar MakeTransformationAddConstantScalar(
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uint32_t fresh_id, uint32_t type_id, std::vector<uint32_t> words) {
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protobufs::TransformationAddConstantScalar result;
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result.set_fresh_id(fresh_id);
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result.set_type_id(type_id);
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for (auto word : words) {
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result.add_word(word);
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}
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return result;
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}
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} // namespace transformation
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} // namespace fuzz
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} // namespace spvtools
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