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// Copyright (c) 2020 André Perez Maselco
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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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// http://www.apache.org/licenses/LICENSE-2.0
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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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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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: FuzzerPass(ir_context, transformation_context, fuzzer_context,
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FuzzerPassInlineFunctions::~FuzzerPassInlineFunctions() = default;
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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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// |instruction| must be suitable for inlining.
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if (!TransformationInlineFunction::IsSuitableForInlining(
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GetIRContext(), &instruction)) {
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function_call_instructions.push_back(&instruction);
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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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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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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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// 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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} // namespace spvtools
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source/fuzz/fuzzer_pass_inline_functions.cpp
