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// Copyright (c) 2020 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_replace_copy_objects_with_stores_loads.h"
#include "source/fuzz/fuzzer_util.h"
#include "source/fuzz/instruction_descriptor.h"
#include "source/fuzz/transformation_replace_copy_object_with_store_load.h"
namespace spvtools {
namespace fuzz {
FuzzerPassReplaceCopyObjectsWithStoresLoads::
FuzzerPassReplaceCopyObjectsWithStoresLoads(
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 FuzzerPassReplaceCopyObjectsWithStoresLoads::Apply() {
GetIRContext()->module()->ForEachInst([this](opt::Instruction* instruction) {
// Randomly decide whether to replace OpCopyObject.
if (!GetFuzzerContext()->ChoosePercentage(
GetFuzzerContext()
->GetChanceOfReplacingCopyObjectWithStoreLoad())) {
return;
}
// The instruction must be OpCopyObject.
if (instruction->opcode() != SpvOpCopyObject) {
return;
}
// The opcode of the type_id instruction cannot be a OpTypePointer,
// because we cannot define a pointer to pointer.
if (GetIRContext()
->get_def_use_mgr()
->GetDef(instruction->type_id())
->opcode() == SpvOpTypePointer) {
return;
}
// It must be valid to insert OpStore and OpLoad instructions
// before the instruction OpCopyObject.
if (!fuzzerutil::CanInsertOpcodeBeforeInstruction(SpvOpStore,
instruction) ||
!fuzzerutil::CanInsertOpcodeBeforeInstruction(SpvOpLoad, instruction)) {
return;
}
// Randomly decides whether a global or local variable will be added.
auto variable_storage_class = GetFuzzerContext()->ChooseEven()
? SpvStorageClassPrivate
: SpvStorageClassFunction;
// Find or create a constant to initialize the variable from. The type of
// |instruction| must be such that the function FindOrCreateConstant can be
// called.
if (!fuzzerutil::CanCreateConstant(GetIRContext(),
instruction->type_id())) {
return;
}
auto variable_initializer_id =
FindOrCreateZeroConstant(instruction->type_id(), false);
// Make sure that pointer type is defined.
FindOrCreatePointerType(instruction->type_id(), variable_storage_class);
// Apply the transformation replacing OpCopyObject with Store and Load.
ApplyTransformation(TransformationReplaceCopyObjectWithStoreLoad(
instruction->result_id(), GetFuzzerContext()->GetFreshId(),
variable_storage_class, variable_initializer_id));
});
}
} // namespace fuzz
} // namespace spvtools
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