SPIRV-Tools/source/fuzz/fuzzer_context.cpp
Alastair Donaldson 4a00a80c40
Add fuzzer pass to add dead breaks. (#2654)
This pass randomly add breaks to the merge blocks of selection and
loop constructs, such that the breaking edges will not be dynamically
reachable.
2019-06-05 08:02:16 +01:00

49 lines
1.6 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_context.h"
namespace spvtools {
namespace fuzz {
namespace {
// Default probabilities for applying various transformations.
// All values are percentages.
// Keep them in alphabetical order.
const uint32_t kDefaultChanceOfAddingDeadBreak = 20;
const uint32_t kDefaultChanceOfMovingBlockDown = 25;
const uint32_t kDefaultChanceOfSplittingBlock = 20;
} // namespace
FuzzerContext::FuzzerContext(RandomGenerator* random_generator,
uint32_t min_fresh_id)
: random_generator_(random_generator),
next_fresh_id_(min_fresh_id),
chance_of_adding_dead_break_(kDefaultChanceOfAddingDeadBreak),
chance_of_moving_block_down_(kDefaultChanceOfMovingBlockDown),
chance_of_splitting_block_(kDefaultChanceOfSplittingBlock) {}
FuzzerContext::~FuzzerContext() = default;
uint32_t FuzzerContext::GetFreshId() { return next_fresh_id_++; }
RandomGenerator* FuzzerContext::GetRandomGenerator() {
return random_generator_;
}
} // namespace fuzz
} // namespace spvtools