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// Copyright 2021 The Tint Authors.
//
// 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 "src/tint/fuzzers/tint_ast_fuzzer/mutations/replace_identifier.h"
#include <utility>
#include "src/tint/fuzzers/tint_ast_fuzzer/util.h"
#include "src/tint/program_builder.h"
namespace tint::fuzzers::ast_fuzzer {
MutationReplaceIdentifier::MutationReplaceIdentifier(protobufs::MutationReplaceIdentifier message)
: message_(std::move(message)) {}
MutationReplaceIdentifier::MutationReplaceIdentifier(uint32_t use_id, uint32_t replacement_id) {
message_.set_use_id(use_id);
message_.set_replacement_id(replacement_id);
}
bool MutationReplaceIdentifier::IsApplicable(const tint::Program& program,
const NodeIdMap& node_id_map) const {
const auto* use_ast_node =
tint::As<ast::IdentifierExpression>(node_id_map.GetNode(message_.use_id()));
if (!use_ast_node) {
// Either the `use_id` is invalid or the node is not an
// `IdentifierExpression`.
return false;
}
const auto* use_sem_node = tint::As<sem::VariableUser>(program.Sem().Get(use_ast_node));
if (!use_sem_node) {
// Either the semantic information is not present for a `use_node` or that
// node is not a variable user.
return false;
}
const auto* replacement_ast_node =
tint::As<ast::Variable>(node_id_map.GetNode(message_.replacement_id()));
if (!replacement_ast_node) {
// Either the `replacement_id` is invalid or is not an id of a variable.
return false;
}
const auto* replacement_sem_node = program.Sem().Get(replacement_ast_node);
if (!replacement_sem_node) {
return false;
}
if (replacement_sem_node == use_sem_node->Variable()) {
return false;
}
auto in_scope = util::GetAllVarsInScope(
program, use_sem_node->Stmt(),
[replacement_sem_node](const sem::Variable* var) { return var == replacement_sem_node; });
if (in_scope.empty()) {
// The replacement variable is not in scope.
return false;
}
return use_sem_node->Type() == replacement_sem_node->Type();
}
void MutationReplaceIdentifier::Apply(const NodeIdMap& node_id_map,
tint::CloneContext* clone_context,
NodeIdMap* new_node_id_map) const {
const auto* use_node = node_id_map.GetNode(message_.use_id());
const auto* replacement_var =
tint::As<ast::Variable>(node_id_map.GetNode(message_.replacement_id()));
auto* cloned_replacement =
clone_context->dst->Expr(clone_context->Clone(use_node->source),
clone_context->Clone(replacement_var->name->symbol));
clone_context->Replace(use_node, cloned_replacement);
new_node_id_map->Add(cloned_replacement, message_.use_id());
}
protobufs::Mutation MutationReplaceIdentifier::ToMessage() const {
protobufs::Mutation mutation;
*mutation.mutable_replace_identifier() = message_;
return mutation;
}
} // namespace tint::fuzzers::ast_fuzzer