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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/transformation_add_copy_memory.h"
#include "source/fuzz/fuzzer_util.h"
#include "source/fuzz/instruction_descriptor.h"
#include "source/opt/instruction.h"
namespace spvtools {
namespace fuzz {
TransformationAddCopyMemory::TransformationAddCopyMemory(
protobufs::TransformationAddCopyMemory message)
: message_(std::move(message)) {}
TransformationAddCopyMemory::TransformationAddCopyMemory(
const protobufs::InstructionDescriptor& instruction_descriptor,
uint32_t fresh_id, uint32_t source_id, spv::StorageClass storage_class,
uint32_t initializer_id) {
*message_.mutable_instruction_descriptor() = instruction_descriptor;
message_.set_fresh_id(fresh_id);
message_.set_source_id(source_id);
message_.set_storage_class(uint32_t(storage_class));
message_.set_initializer_id(initializer_id);
}
bool TransformationAddCopyMemory::IsApplicable(
opt::IRContext* ir_context, const TransformationContext& /*unused*/) const {
// Check that target id is fresh.
if (!fuzzerutil::IsFreshId(ir_context, message_.fresh_id())) {
return false;
}
// Check that instruction descriptor is valid. This also checks that
// |message_.instruction_descriptor| is not a global instruction.
auto* inst = FindInstruction(message_.instruction_descriptor(), ir_context);
if (!inst) {
return false;
}
// Check that we can insert OpCopyMemory before |instruction_descriptor|.
auto iter = fuzzerutil::GetIteratorForInstruction(
ir_context->get_instr_block(inst), inst);
if (!fuzzerutil::CanInsertOpcodeBeforeInstruction(spv::Op::OpCopyMemory,
iter)) {
return false;
}
// Check that source instruction exists and is valid.
auto* source_inst =
ir_context->get_def_use_mgr()->GetDef(message_.source_id());
if (!source_inst || !IsInstructionSupported(ir_context, source_inst)) {
return false;
}
// |storage_class| is either Function or Private.
if (spv::StorageClass(message_.storage_class()) !=
spv::StorageClass::Function &&
spv::StorageClass(message_.storage_class()) !=
spv::StorageClass::Private) {
return false;
}
auto pointee_type_id = fuzzerutil::GetPointeeTypeIdFromPointerType(
ir_context, source_inst->type_id());
// OpTypePointer with |message_.storage_class| exists.
if (!fuzzerutil::MaybeGetPointerType(
ir_context, pointee_type_id,
static_cast<spv::StorageClass>(message_.storage_class()))) {
return false;
}
// Check that |initializer_id| exists and has valid type.
const auto* initializer_inst =
ir_context->get_def_use_mgr()->GetDef(message_.initializer_id());
if (!initializer_inst || initializer_inst->type_id() != pointee_type_id) {
return false;
}
// Check that domination rules are satisfied.
return fuzzerutil::IdIsAvailableBeforeInstruction(ir_context, inst,
message_.source_id());
}
void TransformationAddCopyMemory::Apply(
opt::IRContext* ir_context,
TransformationContext* transformation_context) const {
// Insert OpCopyMemory before |instruction_descriptor|.
auto* insert_before_inst =
FindInstruction(message_.instruction_descriptor(), ir_context);
assert(insert_before_inst);
opt::BasicBlock* enclosing_block =
ir_context->get_instr_block(insert_before_inst);
// Add global or local variable to copy memory into.
auto storage_class = static_cast<spv::StorageClass>(message_.storage_class());
auto type_id = fuzzerutil::MaybeGetPointerType(
ir_context,
fuzzerutil::GetPointeeTypeIdFromPointerType(
ir_context, fuzzerutil::GetTypeId(ir_context, message_.source_id())),
storage_class);
if (storage_class == spv::StorageClass::Private) {
opt::Instruction* new_global =
fuzzerutil::AddGlobalVariable(ir_context, message_.fresh_id(), type_id,
storage_class, message_.initializer_id());
ir_context->get_def_use_mgr()->AnalyzeInstDefUse(new_global);
} else {
assert(storage_class == spv::StorageClass::Function &&
"Storage class can be either Private or Function");
opt::Function* enclosing_function = enclosing_block->GetParent();
opt::Instruction* new_local = fuzzerutil::AddLocalVariable(
ir_context, message_.fresh_id(), type_id,
enclosing_function->result_id(), message_.initializer_id());
ir_context->get_def_use_mgr()->AnalyzeInstDefUse(new_local);
ir_context->set_instr_block(new_local, &*enclosing_function->entry());
}
auto insert_before_iter = fuzzerutil::GetIteratorForInstruction(
enclosing_block, insert_before_inst);
auto new_instruction = MakeUnique<opt::Instruction>(
ir_context, spv::Op::OpCopyMemory, 0, 0,
opt::Instruction::OperandList{
{SPV_OPERAND_TYPE_ID, {message_.fresh_id()}},
{SPV_OPERAND_TYPE_ID, {message_.source_id()}}});
auto new_instruction_ptr = new_instruction.get();
insert_before_iter.InsertBefore(std::move(new_instruction));
ir_context->get_def_use_mgr()->AnalyzeInstDefUse(new_instruction_ptr);
ir_context->set_instr_block(new_instruction_ptr, enclosing_block);
fuzzerutil::UpdateModuleIdBound(ir_context, message_.fresh_id());
// Even though the copy memory instruction will - at least temporarily - lead
// to the destination and source pointers referring to identical values, this
// fact is not guaranteed to hold throughout execution of the SPIR-V code
// since the source pointer could be over-written. We thus assume nothing
// about the destination pointer, and record this fact so that the destination
// pointer can be used freely by other fuzzer passes.
transformation_context->GetFactManager()->AddFactValueOfPointeeIsIrrelevant(
message_.fresh_id());
}
protobufs::Transformation TransformationAddCopyMemory::ToMessage() const {
protobufs::Transformation result;
*result.mutable_add_copy_memory() = message_;
return result;
}
bool TransformationAddCopyMemory::IsInstructionSupported(
opt::IRContext* ir_context, opt::Instruction* inst) {
if (!inst->result_id() || !inst->type_id() ||
inst->opcode() == spv::Op::OpConstantNull ||
inst->opcode() == spv::Op::OpUndef) {
return false;
}
const auto* type = ir_context->get_type_mgr()->GetType(inst->type_id());
assert(type && "Instruction must have a valid type");
if (!type->AsPointer()) {
return false;
}
// We do not support copying memory from a pointer to a block-/buffer
// block-decorated struct.
auto pointee_type_inst = ir_context->get_def_use_mgr()
->GetDef(inst->type_id())
->GetSingleWordInOperand(1);
if (fuzzerutil::HasBlockOrBufferBlockDecoration(ir_context,
pointee_type_inst)) {
return false;
}
return CanUsePointeeWithCopyMemory(*type->AsPointer()->pointee_type());
}
bool TransformationAddCopyMemory::CanUsePointeeWithCopyMemory(
const opt::analysis::Type& type) {
switch (type.kind()) {
case opt::analysis::Type::kBool:
case opt::analysis::Type::kInteger:
case opt::analysis::Type::kFloat:
case opt::analysis::Type::kArray:
return true;
case opt::analysis::Type::kVector:
return CanUsePointeeWithCopyMemory(*type.AsVector()->element_type());
case opt::analysis::Type::kMatrix:
return CanUsePointeeWithCopyMemory(*type.AsMatrix()->element_type());
case opt::analysis::Type::kStruct:
return std::all_of(type.AsStruct()->element_types().begin(),
type.AsStruct()->element_types().end(),
[](const opt::analysis::Type* element) {
return CanUsePointeeWithCopyMemory(*element);
});
default:
return false;
}
}
std::unordered_set<uint32_t> TransformationAddCopyMemory::GetFreshIds() const {
return {message_.fresh_id()};
}
} // namespace fuzz
} // namespace spvtools
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