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// Copyright 2022 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/transform/utils/get_insertion_point.h"
#include "src/tint/debug.h"
#include "src/tint/diagnostic/diagnostic.h"
#include "src/tint/sem/for_loop_statement.h"
namespace tint::transform::utils {
InsertionPoint GetInsertionPoint(CloneContext& ctx, const ast::Statement* stmt) {
auto& sem = ctx.src->Sem();
auto& diag = ctx.dst->Diagnostics();
using RetType = std::pair<const sem::BlockStatement*, const ast::Statement*>;
if (auto* sem_stmt = sem.Get(stmt)) {
auto* parent = sem_stmt->Parent();
return Switch(
parent,
[&](const sem::BlockStatement* block) -> RetType {
// Common case, can insert in the current block above/below the input
// statement.
return {block, stmt};
},
[&](const sem::ForLoopStatement* fl) -> RetType {
// `stmt` is either the for loop initializer or the continuing
// statement of a for-loop.
if (fl->Declaration()->initializer == stmt) {
// For loop init, can insert above the for loop itself.
return {fl->Block(), fl->Declaration()};
}
// Cannot insert before or after continuing statement of a for-loop
return {};
},
[&](Default) -> RetType {
TINT_ICE(Transform, diag) << "expected parent of statement to be "
"either a block or for loop";
return {};
});
}
return {};
}
} // namespace tint::transform::utils