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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/ast/transform/remove_unreachable_statements.h"
#include <memory>
#include <unordered_map>
#include <utility>
#include <vector>
#include "src/tint/ast/traverse_expressions.h"
#include "src/tint/program_builder.h"
#include "src/tint/sem/block_statement.h"
#include "src/tint/sem/function.h"
#include "src/tint/sem/statement.h"
#include "src/tint/sem/variable.h"
#include "src/tint/utils/map.h"
#include "src/tint/utils/scoped_assignment.h"
TINT_INSTANTIATE_TYPEINFO(tint::ast::transform::RemoveUnreachableStatements);
namespace tint::ast::transform {
RemoveUnreachableStatements::RemoveUnreachableStatements() = default;
RemoveUnreachableStatements::~RemoveUnreachableStatements() = default;
Transform::ApplyResult RemoveUnreachableStatements::Apply(const Program* src,
const DataMap&,
DataMap&) const {
ProgramBuilder b;
CloneContext ctx{&b, src, /* auto_clone_symbols */ true};
bool made_changes = false;
for (auto* node : src->ASTNodes().Objects()) {
if (auto* stmt = src->Sem().Get<sem::Statement>(node)) {
if (!stmt->IsReachable()) {
RemoveStatement(ctx, stmt->Declaration());
made_changes = true;
}
}
}
if (!made_changes) {
return SkipTransform;
}
ctx.Clone();
return Program(std::move(b));
}
} // namespace tint::ast::transform