107 lines
3.6 KiB
C++
107 lines
3.6 KiB
C++
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// Copyright 2021 The Tint Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "fuzzers/tint_ast_fuzzer/mutations/replace_identifier.h"
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#include <utility>
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#include "fuzzers/tint_ast_fuzzer/util.h"
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#include "src/program_builder.h"
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namespace tint {
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namespace fuzzers {
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namespace ast_fuzzer {
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MutationReplaceIdentifier::MutationReplaceIdentifier(
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protobufs::MutationReplaceIdentifier message)
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: message_(std::move(message)) {}
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MutationReplaceIdentifier::MutationReplaceIdentifier(uint32_t use_id,
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uint32_t replacement_id) {
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message_.set_use_id(use_id);
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message_.set_replacement_id(replacement_id);
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}
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bool MutationReplaceIdentifier::IsApplicable(
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const tint::Program& program,
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const NodeIdMap& node_id_map) const {
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const auto* use_ast_node = tint::As<ast::IdentifierExpression>(
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node_id_map.GetNode(message_.use_id()));
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if (!use_ast_node) {
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// Either the `use_id` is invalid or the node is not an
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// `IdentifierExpression`.
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return false;
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}
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const auto* use_sem_node =
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tint::As<sem::VariableUser>(program.Sem().Get(use_ast_node));
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if (!use_sem_node) {
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// Either the semantic information is not present for a `use_node` or that
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// node is not a variable user.
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return false;
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}
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const auto* replacement_ast_node =
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tint::As<ast::Variable>(node_id_map.GetNode(message_.replacement_id()));
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if (!replacement_ast_node) {
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// Either the `replacement_id` is invalid or is not an id of a variable.
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return false;
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}
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const auto* replacement_sem_node = program.Sem().Get(replacement_ast_node);
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if (!replacement_sem_node) {
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return false;
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}
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if (replacement_sem_node == use_sem_node->Variable()) {
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return false;
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}
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auto in_scope =
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util::GetAllVarsInScope(program, use_sem_node->Stmt(),
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[replacement_sem_node](const sem::Variable* var) {
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return var == replacement_sem_node;
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});
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if (in_scope.empty()) {
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// The replacement variable is not in scope.
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return false;
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}
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return use_sem_node->Type() == replacement_sem_node->Type();
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}
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void MutationReplaceIdentifier::Apply(const NodeIdMap& node_id_map,
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tint::CloneContext* clone_context,
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NodeIdMap* new_node_id_map) const {
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const auto* use_node = node_id_map.GetNode(message_.use_id());
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const auto* replacement_var =
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tint::As<ast::Variable>(node_id_map.GetNode(message_.replacement_id()));
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auto* cloned_replacement =
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clone_context->dst->Expr(clone_context->Clone(use_node->source()),
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clone_context->Clone(replacement_var->symbol()));
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clone_context->Replace(use_node, cloned_replacement);
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new_node_id_map->Add(cloned_replacement, message_.use_id());
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}
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protobufs::Mutation MutationReplaceIdentifier::ToMessage() const {
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protobufs::Mutation mutation;
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*mutation.mutable_replace_identifier() = message_;
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return mutation;
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}
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} // namespace ast_fuzzer
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} // namespace fuzzers
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} // namespace tint
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