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