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https://github.com/KhronosGroup/SPIRV-Tools
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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.
104 lines
4.1 KiB
C++
104 lines
4.1 KiB
C++
// Copyright (c) 2020 André Perez Maselco
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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_inline_functions.h"
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#include "source/fuzz/fuzzer_util.h"
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#include "source/fuzz/instruction_descriptor.h"
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#include "source/fuzz/transformation_inline_function.h"
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#include "source/fuzz/transformation_split_block.h"
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namespace spvtools {
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namespace fuzz {
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FuzzerPassInlineFunctions::FuzzerPassInlineFunctions(
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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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bool ignore_inapplicable_transformations)
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: FuzzerPass(ir_context, transformation_context, fuzzer_context,
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transformations, ignore_inapplicable_transformations) {}
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void FuzzerPassInlineFunctions::Apply() {
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// |function_call_instructions| are the instructions that will be inlined.
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// First, they will be collected and then do the inlining in another loop.
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// This avoids changing the module while it is being inspected.
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std::vector<opt::Instruction*> function_call_instructions;
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for (auto& function : *GetIRContext()->module()) {
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for (auto& block : function) {
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for (auto& instruction : block) {
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if (!GetFuzzerContext()->ChoosePercentage(
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GetFuzzerContext()->GetChanceOfInliningFunction())) {
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continue;
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}
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// |instruction| must be suitable for inlining.
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if (!TransformationInlineFunction::IsSuitableForInlining(
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GetIRContext(), &instruction)) {
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continue;
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}
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function_call_instructions.push_back(&instruction);
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}
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}
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}
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// Once the function calls have been collected, it's time to actually create
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// and apply the inlining transformations.
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for (auto& function_call_instruction : function_call_instructions) {
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// If |function_call_instruction| is not the penultimate instruction in its
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// block or its block termination instruction is not OpBranch, then try to
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// split |function_call_block| such that the conditions are met.
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auto* function_call_block =
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GetIRContext()->get_instr_block(function_call_instruction);
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if ((function_call_instruction != &*--function_call_block->tail() ||
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function_call_block->terminator()->opcode() != SpvOpBranch) &&
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!MaybeApplyTransformation(TransformationSplitBlock(
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MakeInstructionDescriptor(GetIRContext(),
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function_call_instruction->NextNode()),
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GetFuzzerContext()->GetFreshId()))) {
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continue;
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}
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auto* called_function = fuzzerutil::FindFunction(
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GetIRContext(), function_call_instruction->GetSingleWordInOperand(0));
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// Mapping the called function instructions.
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std::map<uint32_t, uint32_t> result_id_map;
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for (auto& called_function_block : *called_function) {
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// The called function entry block label will not be inlined.
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if (&called_function_block != &*called_function->entry()) {
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result_id_map[called_function_block.GetLabelInst()->result_id()] =
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GetFuzzerContext()->GetFreshId();
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}
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for (auto& instruction_to_inline : called_function_block) {
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// The instructions are mapped to fresh ids.
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if (instruction_to_inline.HasResultId()) {
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result_id_map[instruction_to_inline.result_id()] =
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GetFuzzerContext()->GetFreshId();
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}
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}
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}
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// Applies the inline function transformation.
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ApplyTransformation(TransformationInlineFunction(
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function_call_instruction->result_id(), result_id_map));
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}
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}
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} // namespace fuzz
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} // namespace spvtools
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