| // 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 |