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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.
72 lines
2.9 KiB
C++
72 lines
2.9 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_adjust_function_controls.h"
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#include "source/fuzz/transformation_set_function_control.h"
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namespace spvtools {
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namespace fuzz {
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FuzzerPassAdjustFunctionControls::FuzzerPassAdjustFunctionControls(
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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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FuzzerPassAdjustFunctionControls::~FuzzerPassAdjustFunctionControls() = default;
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void FuzzerPassAdjustFunctionControls::Apply() {
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// Consider every function in the module.
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for (auto& function : *GetIRContext()->module()) {
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// Randomly decide whether to adjust this function's controls.
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if (GetFuzzerContext()->ChoosePercentage(
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GetFuzzerContext()->GetChanceOfAdjustingFunctionControl())) {
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// Grab the function control mask for the function in its present form.
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uint32_t existing_function_control_mask =
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function.DefInst().GetSingleWordInOperand(0);
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// For the new mask, we first randomly select one of three basic masks:
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// None, Inline or DontInline. These are always valid (and are mutually
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// exclusive).
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std::vector<uint32_t> basic_function_control_masks = {
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SpvFunctionControlMaskNone, SpvFunctionControlInlineMask,
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SpvFunctionControlDontInlineMask};
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uint32_t new_function_control_mask =
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basic_function_control_masks[GetFuzzerContext()->RandomIndex(
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basic_function_control_masks)];
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// We now consider the Pure and Const mask bits. If these are already
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// set on the function then it's OK to keep them, but also interesting
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// to consider dropping them, so we decide randomly in each case.
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for (auto mask_bit :
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{SpvFunctionControlPureMask, SpvFunctionControlConstMask}) {
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if ((existing_function_control_mask & mask_bit) &&
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GetFuzzerContext()->ChooseEven()) {
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new_function_control_mask |= mask_bit;
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}
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}
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// Create and add a transformation.
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TransformationSetFunctionControl transformation(
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function.DefInst().result_id(), new_function_control_mask);
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ApplyTransformation(transformation);
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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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