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https://github.com/KhronosGroup/SPIRV-Tools
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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.
77 lines
3.1 KiB
C++
77 lines
3.1 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_global_variables.h"
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#include "source/fuzz/transformation_add_global_variable.h"
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#include "source/fuzz/transformation_add_type_pointer.h"
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namespace spvtools {
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namespace fuzz {
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FuzzerPassAddGlobalVariables::FuzzerPassAddGlobalVariables(
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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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FuzzerPassAddGlobalVariables::~FuzzerPassAddGlobalVariables() = default;
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void FuzzerPassAddGlobalVariables::Apply() {
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auto base_type_ids_and_pointers =
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GetAvailableBaseTypesAndPointers(SpvStorageClassPrivate);
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// These are the base types that are available to this fuzzer pass.
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auto& base_types = base_type_ids_and_pointers.first;
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// These are the pointers to those base types that are *initially* available
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// to the fuzzer pass. The fuzzer pass might add pointer types in cases where
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// none are available for a given base type.
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auto& base_type_to_pointers = base_type_ids_and_pointers.second;
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// Probabilistically keep adding global variables.
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while (GetFuzzerContext()->ChoosePercentage(
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GetFuzzerContext()->GetChanceOfAddingGlobalVariable())) {
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// Choose a random base type; the new variable's type will be a pointer to
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// this base type.
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uint32_t base_type =
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base_types[GetFuzzerContext()->RandomIndex(base_types)];
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uint32_t pointer_type_id;
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std::vector<uint32_t>& available_pointers_to_base_type =
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base_type_to_pointers.at(base_type);
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// Determine whether there is at least one pointer to this base type.
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if (available_pointers_to_base_type.empty()) {
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// There is not. Make one, to use here, and add it to the available
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// pointers for the base type so that future variables can potentially
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// use it.
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pointer_type_id = GetFuzzerContext()->GetFreshId();
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available_pointers_to_base_type.push_back(pointer_type_id);
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ApplyTransformation(TransformationAddTypePointer(
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pointer_type_id, SpvStorageClassPrivate, base_type));
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} else {
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// There is - grab one.
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pointer_type_id =
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available_pointers_to_base_type[GetFuzzerContext()->RandomIndex(
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available_pointers_to_base_type)];
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}
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ApplyTransformation(TransformationAddGlobalVariable(
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GetFuzzerContext()->GetFreshId(), pointer_type_id,
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FindOrCreateZeroConstant(base_type), true));
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}
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}
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} // namespace fuzz
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} // namespace spvtools
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