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// Copyright (c) 2019 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_add_global_variable.h"
#include "source/fuzz/fuzzer_util.h"
namespace spvtools {
namespace fuzz {
TransformationAddGlobalVariable::TransformationAddGlobalVariable(
spvtools::fuzz::protobufs::TransformationAddGlobalVariable message)
: message_(std::move(message)) {}
TransformationAddGlobalVariable::TransformationAddGlobalVariable(
uint32_t fresh_id, uint32_t type_id, SpvStorageClass storage_class,
uint32_t initializer_id, bool value_is_irrelevant) {
message_.set_fresh_id(fresh_id);
message_.set_type_id(type_id);
message_.set_storage_class(storage_class);
message_.set_initializer_id(initializer_id);
message_.set_value_is_irrelevant(value_is_irrelevant);
}
bool TransformationAddGlobalVariable::IsApplicable(
opt::IRContext* ir_context, const TransformationContext& /*unused*/) const {
// The result id must be fresh.
if (!fuzzerutil::IsFreshId(ir_context, message_.fresh_id())) {
return false;
}
// The storage class must be Private or Workgroup.
auto storage_class = static_cast<SpvStorageClass>(message_.storage_class());
switch (storage_class) {
case SpvStorageClassPrivate:
case SpvStorageClassWorkgroup:
break;
default:
assert(false && "Unsupported storage class.");
return false;
}
// The type id must correspond to a type.
auto type = ir_context->get_type_mgr()->GetType(message_.type_id());
if (!type) {
return false;
}
// That type must be a pointer type ...
auto pointer_type = type->AsPointer();
if (!pointer_type) {
return false;
}
// ... with the right storage class.
if (pointer_type->storage_class() != storage_class) {
return false;
}
if (message_.initializer_id()) {
// An initializer is not allowed if the storage class is Workgroup.
if (storage_class == SpvStorageClassWorkgroup) {
assert(false &&
"By construction this transformation should not have an "
"initializer when Workgroup storage class is used.");
return false;
}
// The initializer id must be the id of a constant. Check this with the
// constant manager.
auto constant_id = ir_context->get_constant_mgr()->GetConstantsFromIds(
{message_.initializer_id()});
if (constant_id.empty()) {
return false;
}
assert(constant_id.size() == 1 &&
"We asked for the constant associated with a single id; we should "
"get a single constant.");
// The type of the constant must match the pointee type of the pointer.
if (pointer_type->pointee_type() != constant_id[0]->type()) {
return false;
}
}
return true;
}
void TransformationAddGlobalVariable::Apply(
opt::IRContext* ir_context,
TransformationContext* transformation_context) const {
opt::Instruction* new_instruction = fuzzerutil::AddGlobalVariable(
ir_context, message_.fresh_id(), message_.type_id(),
static_cast<SpvStorageClass>(message_.storage_class()),
message_.initializer_id());
// Inform the def-use manager about the new instruction.
ir_context->get_def_use_mgr()->AnalyzeInstDefUse(new_instruction);
if (message_.value_is_irrelevant()) {
transformation_context->GetFactManager()->AddFactValueOfPointeeIsIrrelevant(
message_.fresh_id());
}
}
protobufs::Transformation TransformationAddGlobalVariable::ToMessage() const {
protobufs::Transformation result;
*result.mutable_add_global_variable() = message_;
return result;
}
std::unordered_set<uint32_t> TransformationAddGlobalVariable::GetFreshIds()
const {
return {message_.fresh_id()};
}
} // namespace fuzz
} // namespace spvtools
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