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https://github.com/KhronosGroup/SPIRV-Tools
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bfd25ace08
To avoid problems where global and local variables of opaque or runtime-sized types are added to a module, this change introduces the notion of a 'basic type' -- a type made up from floats, ints, bools, or vectors, matrices, structs and fixed-size arrays of basic types. Added variables have to be of basic type.
81 lines
3.4 KiB
C++
81 lines
3.4 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_local_variables.h"
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#include "source/fuzz/fuzzer_util.h"
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#include "source/fuzz/transformation_add_local_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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FuzzerPassAddLocalVariables::FuzzerPassAddLocalVariables(
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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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FuzzerPassAddLocalVariables::~FuzzerPassAddLocalVariables() = default;
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void FuzzerPassAddLocalVariables::Apply() {
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auto basic_type_ids_and_pointers =
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GetAvailableBasicTypesAndPointers(SpvStorageClassFunction);
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// These are the basic types that are available to this fuzzer pass.
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auto& basic_types = basic_type_ids_and_pointers.first;
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// These are the pointers to those basic 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 basic type.
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auto& basic_type_to_pointers = basic_type_ids_and_pointers.second;
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// Consider every function in the module.
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for (auto& function : *GetIRContext()->module()) {
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// Probabilistically keep adding random variables to this function.
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while (GetFuzzerContext()->ChoosePercentage(
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GetFuzzerContext()->GetChanceOfAddingLocalVariable())) {
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// Choose a random basic type; the new variable's type will be a pointer
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// to this basic type.
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uint32_t basic_type =
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basic_types[GetFuzzerContext()->RandomIndex(basic_types)];
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uint32_t pointer_type;
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std::vector<uint32_t>& available_pointers_to_basic_type =
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basic_type_to_pointers.at(basic_type);
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// Determine whether there is at least one pointer to this basic type.
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if (available_pointers_to_basic_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 basic type so that future variables can potentially
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// use it.
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pointer_type = GetFuzzerContext()->GetFreshId();
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ApplyTransformation(TransformationAddTypePointer(
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pointer_type, SpvStorageClassFunction, basic_type));
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available_pointers_to_basic_type.push_back(pointer_type);
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} else {
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// There is - grab one.
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pointer_type =
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available_pointers_to_basic_type[GetFuzzerContext()->RandomIndex(
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available_pointers_to_basic_type)];
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}
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ApplyTransformation(TransformationAddLocalVariable(
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GetFuzzerContext()->GetFreshId(), pointer_type, function.result_id(),
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FindOrCreateZeroConstant(basic_type), true));
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}
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}
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}
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} // namespace fuzz
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} // namespace spvtools
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