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// Copyright (c) 2020 Vasyl Teliman
//
// 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_add_copy_memory.h"
#include "source/fuzz/fuzzer_context.h"
#include "source/fuzz/fuzzer_util.h"
#include "source/fuzz/instruction_descriptor.h"
#include "source/fuzz/transformation_add_copy_memory.h"
namespace spvtools {
namespace fuzz {
FuzzerPassAddCopyMemory::FuzzerPassAddCopyMemory(
opt::IRContext* ir_context, TransformationContext* transformation_context,
FuzzerContext* fuzzer_context,
protobufs::TransformationSequence* transformations)
: FuzzerPass(ir_context, transformation_context, fuzzer_context,
transformations) {}
void FuzzerPassAddCopyMemory::Apply() {
ForEachInstructionWithInstructionDescriptor(
[this](opt::Function* function, opt::BasicBlock* block,
opt::BasicBlock::iterator inst_it,
const protobufs::InstructionDescriptor& instruction_descriptor) {
// Check that we can insert an OpCopyMemory before this instruction.
if (!fuzzerutil::CanInsertOpcodeBeforeInstruction(SpvOpCopyMemory,
inst_it)) {
return;
}
if (!GetFuzzerContext()->ChoosePercentage(
GetFuzzerContext()->GetChanceOfAddingCopyMemory())) {
return;
}
// Get all instructions available before |inst_it| according to the
// domination rules.
auto instructions = FindAvailableInstructions(
function, block, inst_it,
TransformationAddCopyMemory::IsInstructionSupported);
if (instructions.empty()) {
return;
}
const auto* inst =
instructions[GetFuzzerContext()->RandomIndex(instructions)];
// Decide whether to create global or local variable.
auto storage_class = GetFuzzerContext()->ChooseEven()
? SpvStorageClassPrivate
: SpvStorageClassFunction;
auto pointee_type_id = fuzzerutil::GetPointeeTypeIdFromPointerType(
GetIRContext(), inst->type_id());
// Create a pointer type with |storage_class| if needed.
FindOrCreatePointerType(pointee_type_id, storage_class);
ApplyTransformation(TransformationAddCopyMemory(
instruction_descriptor, GetFuzzerContext()->GetFreshId(),
inst->result_id(), storage_class,
FindOrCreateZeroConstant(pointee_type_id, false)));
});
}
} // namespace fuzz
} // namespace spvtools
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