mirror of
https://github.com/KhronosGroup/SPIRV-Tools
synced 2024-12-27 10:20:14 +00:00
9c4481419e
spirv-fuzz features transformations that should be applicable by construction. Assertions are used to detect when such transformations turn out to be inapplicable. Failures of such assertions indicate bugs in the fuzzer. However, when using the fuzzer at scale (e.g. in ClusterFuzz) reports of these assertion failures create noise, and cause the fuzzer to exit early. This change adds an option whereby inapplicable transformations can be ignored. This reduces noise and allows fuzzing to continue even when a transformation that should be applicable but is not has been erroneously created.
71 lines
2.9 KiB
C++
71 lines
2.9 KiB
C++
// Copyright (c) 2019 Google LLC
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
#include "source/fuzz/fuzzer_pass_adjust_function_controls.h"
|
|
|
|
#include "source/fuzz/transformation_set_function_control.h"
|
|
|
|
namespace spvtools {
|
|
namespace fuzz {
|
|
|
|
FuzzerPassAdjustFunctionControls::FuzzerPassAdjustFunctionControls(
|
|
opt::IRContext* ir_context, TransformationContext* transformation_context,
|
|
FuzzerContext* fuzzer_context,
|
|
protobufs::TransformationSequence* transformations,
|
|
bool ignore_inapplicable_transformations)
|
|
: FuzzerPass(ir_context, transformation_context, fuzzer_context,
|
|
transformations, ignore_inapplicable_transformations) {}
|
|
|
|
void FuzzerPassAdjustFunctionControls::Apply() {
|
|
// Consider every function in the module.
|
|
for (auto& function : *GetIRContext()->module()) {
|
|
// Randomly decide whether to adjust this function's controls.
|
|
if (GetFuzzerContext()->ChoosePercentage(
|
|
GetFuzzerContext()->GetChanceOfAdjustingFunctionControl())) {
|
|
// Grab the function control mask for the function in its present form.
|
|
uint32_t existing_function_control_mask =
|
|
function.DefInst().GetSingleWordInOperand(0);
|
|
|
|
// For the new mask, we first randomly select one of three basic masks:
|
|
// None, Inline or DontInline. These are always valid (and are mutually
|
|
// exclusive).
|
|
std::vector<uint32_t> basic_function_control_masks = {
|
|
SpvFunctionControlMaskNone, SpvFunctionControlInlineMask,
|
|
SpvFunctionControlDontInlineMask};
|
|
uint32_t new_function_control_mask =
|
|
basic_function_control_masks[GetFuzzerContext()->RandomIndex(
|
|
basic_function_control_masks)];
|
|
|
|
// We now consider the Pure and Const mask bits. If these are already
|
|
// set on the function then it's OK to keep them, but also interesting
|
|
// to consider dropping them, so we decide randomly in each case.
|
|
for (auto mask_bit :
|
|
{SpvFunctionControlPureMask, SpvFunctionControlConstMask}) {
|
|
if ((existing_function_control_mask & mask_bit) &&
|
|
GetFuzzerContext()->ChooseEven()) {
|
|
new_function_control_mask |= mask_bit;
|
|
}
|
|
}
|
|
|
|
// Create and add a transformation.
|
|
TransformationSetFunctionControl transformation(
|
|
function.DefInst().result_id(), new_function_control_mask);
|
|
ApplyTransformation(transformation);
|
|
}
|
|
}
|
|
}
|
|
|
|
} // namespace fuzz
|
|
} // namespace spvtools
|