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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_memory_with_load_store.h"
#include "source/fuzz/fuzzer_util.h"
#include "source/fuzz/instruction_descriptor.h"
namespace spvtools {
namespace fuzz {
TransformationReplaceCopyMemoryWithLoadStore::
TransformationReplaceCopyMemoryWithLoadStore(
protobufs::TransformationReplaceCopyMemoryWithLoadStore message)
: message_(std::move(message)) {}
TransformationReplaceCopyMemoryWithLoadStore::
TransformationReplaceCopyMemoryWithLoadStore(
uint32_t fresh_id, const protobufs::InstructionDescriptor&
copy_memory_instruction_descriptor) {
message_.set_fresh_id(fresh_id);
*message_.mutable_copy_memory_instruction_descriptor() =
copy_memory_instruction_descriptor;
}
bool TransformationReplaceCopyMemoryWithLoadStore::IsApplicable(
opt::IRContext* ir_context, const TransformationContext& /*unused*/) const {
// |message_.fresh_id| must be fresh.
if (!fuzzerutil::IsFreshId(ir_context, message_.fresh_id())) {
return false;
}
// The instruction to be replaced must be defined and have opcode
// OpCopyMemory.
auto copy_memory_instruction = FindInstruction(
message_.copy_memory_instruction_descriptor(), ir_context);
if (!copy_memory_instruction ||
copy_memory_instruction->opcode() != spv::Op::OpCopyMemory) {
return false;
}
return true;
}
void TransformationReplaceCopyMemoryWithLoadStore::Apply(
opt::IRContext* ir_context, TransformationContext* /*unused*/) const {
auto copy_memory_instruction = FindInstruction(
message_.copy_memory_instruction_descriptor(), ir_context);
// |copy_memory_instruction| must be defined.
assert(copy_memory_instruction &&
copy_memory_instruction->opcode() == spv::Op::OpCopyMemory &&
"The required OpCopyMemory instruction must be defined.");
// Integrity check: Both operands must be pointers.
// Get types of ids used as a source and target of |copy_memory_instruction|.
auto target = ir_context->get_def_use_mgr()->GetDef(
copy_memory_instruction->GetSingleWordInOperand(0));
auto source = ir_context->get_def_use_mgr()->GetDef(
copy_memory_instruction->GetSingleWordInOperand(1));
auto target_type_opcode =
ir_context->get_def_use_mgr()->GetDef(target->type_id())->opcode();
auto source_type_opcode =
ir_context->get_def_use_mgr()->GetDef(source->type_id())->opcode();
// Keep release-mode compilers happy. (No unused variables.)
(void)target;
(void)source;
(void)target_type_opcode;
(void)source_type_opcode;
assert(target_type_opcode == spv::Op::OpTypePointer &&
source_type_opcode == spv::Op::OpTypePointer &&
"Operands must be of type OpTypePointer");
// Integrity check: |source| and |target| must point to the same type.
uint32_t target_pointee_type = fuzzerutil::GetPointeeTypeIdFromPointerType(
ir_context, target->type_id());
uint32_t source_pointee_type = fuzzerutil::GetPointeeTypeIdFromPointerType(
ir_context, source->type_id());
// Keep release-mode compilers happy. (No unused variables.)
(void)target_pointee_type;
(void)source_pointee_type;
assert(target_pointee_type == source_pointee_type &&
"Operands must have the same type to which they point to.");
// First, insert the OpStore instruction before the OpCopyMemory instruction
// and then insert the OpLoad instruction before the OpStore instruction.
fuzzerutil::UpdateModuleIdBound(ir_context, message_.fresh_id());
FindInstruction(message_.copy_memory_instruction_descriptor(), ir_context)
->InsertBefore(MakeUnique<opt::Instruction>(
ir_context, spv::Op::OpStore, 0, 0,
opt::Instruction::OperandList(
{{SPV_OPERAND_TYPE_ID, {target->result_id()}},
{SPV_OPERAND_TYPE_ID, {message_.fresh_id()}}})))
->InsertBefore(MakeUnique<opt::Instruction>(
ir_context, spv::Op::OpLoad, target_pointee_type, message_.fresh_id(),
opt::Instruction::OperandList(
{{SPV_OPERAND_TYPE_ID, {source->result_id()}}})));
// Remove the OpCopyMemory instruction.
ir_context->KillInst(copy_memory_instruction);
ir_context->InvalidateAnalysesExceptFor(opt::IRContext::kAnalysisNone);
}
protobufs::Transformation
TransformationReplaceCopyMemoryWithLoadStore::ToMessage() const {
protobufs::Transformation result;
*result.mutable_replace_copy_memory_with_load_store() = message_;
return result;
}
std::unordered_set<uint32_t>
TransformationReplaceCopyMemoryWithLoadStore::GetFreshIds() const {
return {message_.fresh_id()};
}
} // namespace fuzz
} // namespace spvtools