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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/transformation_replace_copy_object_with_store_load.h"
#include "source/fuzz/fuzzer_util.h"
#include "source/fuzz/instruction_descriptor.h"
namespace spvtools {
namespace fuzz {
TransformationReplaceCopyObjectWithStoreLoad::
TransformationReplaceCopyObjectWithStoreLoad(
protobufs::TransformationReplaceCopyObjectWithStoreLoad message)
: message_(std::move(message)) {}
TransformationReplaceCopyObjectWithStoreLoad::
TransformationReplaceCopyObjectWithStoreLoad(
uint32_t copy_object_result_id, uint32_t fresh_variable_id,
uint32_t variable_storage_class, uint32_t variable_initializer_id) {
message_.set_copy_object_result_id(copy_object_result_id);
message_.set_fresh_variable_id(fresh_variable_id);
message_.set_variable_storage_class(variable_storage_class);
message_.set_variable_initializer_id(variable_initializer_id);
}
bool TransformationReplaceCopyObjectWithStoreLoad::IsApplicable(
opt::IRContext* ir_context, const TransformationContext& /*unused*/) const {
// |message_.fresh_variable_id| must be fresh.
if (!fuzzerutil::IsFreshId(ir_context, message_.fresh_variable_id())) {
return false;
}
auto copy_object_instruction =
ir_context->get_def_use_mgr()->GetDef(message_.copy_object_result_id());
// This must be a defined OpCopyObject instruction.
if (!copy_object_instruction ||
copy_object_instruction->opcode() != spv::Op::OpCopyObject) {
return false;
}
// The opcode of the type_id instruction cannot be a OpTypePointer,
// because we cannot define a pointer to pointer.
if (ir_context->get_def_use_mgr()
->GetDef(copy_object_instruction->type_id())
->opcode() == spv::Op::OpTypePointer) {
return false;
}
// A pointer type instruction pointing to the value type must be defined.
auto pointer_type_id = fuzzerutil::MaybeGetPointerType(
ir_context, copy_object_instruction->type_id(),
static_cast<spv::StorageClass>(message_.variable_storage_class()));
if (!pointer_type_id) {
return false;
}
// Check that initializer is valid.
const auto* constant_inst =
ir_context->get_def_use_mgr()->GetDef(message_.variable_initializer_id());
if (!constant_inst || !spvOpcodeIsConstant(constant_inst->opcode()) ||
copy_object_instruction->type_id() != constant_inst->type_id()) {
return false;
}
// |message_.variable_storage_class| must be Private or Function.
return spv::StorageClass(message_.variable_storage_class()) ==
spv::StorageClass::Private ||
spv::StorageClass(message_.variable_storage_class()) ==
spv::StorageClass::Function;
}
void TransformationReplaceCopyObjectWithStoreLoad::Apply(
opt::IRContext* ir_context,
TransformationContext* transformation_context) const {
auto copy_object_instruction =
ir_context->get_def_use_mgr()->GetDef(message_.copy_object_result_id());
// |copy_object_instruction| must be defined.
assert(copy_object_instruction &&
copy_object_instruction->opcode() == spv::Op::OpCopyObject &&
"The required OpCopyObject instruction must be defined.");
opt::BasicBlock* enclosing_block =
ir_context->get_instr_block(copy_object_instruction);
// Get id used as a source by the OpCopyObject instruction.
uint32_t src_operand = copy_object_instruction->GetSingleWordInOperand(0);
// A pointer type instruction pointing to the value type must be defined.
auto pointer_type_id = fuzzerutil::MaybeGetPointerType(
ir_context, copy_object_instruction->type_id(),
static_cast<spv::StorageClass>(message_.variable_storage_class()));
assert(pointer_type_id && "The required pointer type must be available.");
// Adds a global or local variable (according to the storage class).
if (spv::StorageClass(message_.variable_storage_class()) ==
spv::StorageClass::Private) {
opt::Instruction* new_global = fuzzerutil::AddGlobalVariable(
ir_context, message_.fresh_variable_id(), pointer_type_id,
spv::StorageClass::Private, message_.variable_initializer_id());
ir_context->get_def_use_mgr()->AnalyzeInstDefUse(new_global);
} else {
opt::Function* function =
ir_context->get_instr_block(copy_object_instruction)->GetParent();
opt::Instruction* new_local = fuzzerutil::AddLocalVariable(
ir_context, message_.fresh_variable_id(), pointer_type_id,
function->result_id(), message_.variable_initializer_id());
ir_context->get_def_use_mgr()->AnalyzeInstDefUse(new_local);
ir_context->set_instr_block(new_local, &*function->begin());
}
// First, insert the OpLoad instruction before the OpCopyObject instruction
// and then insert the OpStore instruction before the OpLoad instruction.
fuzzerutil::UpdateModuleIdBound(ir_context, message_.fresh_variable_id());
opt::Instruction* load_instruction =
copy_object_instruction->InsertBefore(MakeUnique<opt::Instruction>(
ir_context, spv::Op::OpLoad, copy_object_instruction->type_id(),
message_.copy_object_result_id(),
opt::Instruction::OperandList(
{{SPV_OPERAND_TYPE_ID, {message_.fresh_variable_id()}}})));
opt::Instruction* store_instruction =
load_instruction->InsertBefore(MakeUnique<opt::Instruction>(
ir_context, spv::Op::OpStore, 0, 0,
opt::Instruction::OperandList(
{{SPV_OPERAND_TYPE_ID, {message_.fresh_variable_id()}},
{SPV_OPERAND_TYPE_ID, {src_operand}}})));
// Register the new instructions with the def-use manager, and record their
// enclosing block.
ir_context->get_def_use_mgr()->AnalyzeInstDefUse(store_instruction);
ir_context->get_def_use_mgr()->AnalyzeInstDefUse(load_instruction);
ir_context->set_instr_block(store_instruction, enclosing_block);
ir_context->set_instr_block(load_instruction, enclosing_block);
// Remove the CopyObject instruction.
ir_context->KillInst(copy_object_instruction);
if (!transformation_context->GetFactManager()->IdIsIrrelevant(
message_.copy_object_result_id()) &&
!transformation_context->GetFactManager()->IdIsIrrelevant(src_operand)) {
// Adds the fact that |message_.copy_object_result_id|
// and src_operand (id used by OpCopyObject) are synonymous.
transformation_context->GetFactManager()->AddFactDataSynonym(
MakeDataDescriptor(message_.copy_object_result_id(), {}),
MakeDataDescriptor(src_operand, {}));
}
}
protobufs::Transformation
TransformationReplaceCopyObjectWithStoreLoad::ToMessage() const {
protobufs::Transformation result;
*result.mutable_replace_copy_object_with_store_load() = message_;
return result;
}
std::unordered_set<uint32_t>
TransformationReplaceCopyObjectWithStoreLoad::GetFreshIds() const {
return {message_.fresh_variable_id()};
}
} // namespace fuzz
} // namespace spvtools
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