64 lines
1.8 KiB
C++
64 lines
1.8 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 "src/transform/simplify.h"
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#include <memory>
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#include <unordered_map>
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#include <utility>
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#include "src/program_builder.h"
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#include "src/sem/block_statement.h"
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#include "src/sem/function.h"
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#include "src/sem/statement.h"
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#include "src/sem/variable.h"
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#include "src/utils/scoped_assignment.h"
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namespace tint {
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namespace transform {
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Simplify::Simplify() = default;
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Simplify::~Simplify() = default;
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Output Simplify::Run(const Program* in, const DataMap&) {
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ProgramBuilder out;
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CloneContext ctx(&out, in);
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ctx.ReplaceAll([&](ast::Expression* expr) -> ast::Expression* {
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if (auto* outer = expr->As<ast::UnaryOpExpression>()) {
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if (auto* inner = outer->expr()->As<ast::UnaryOpExpression>()) {
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if (outer->op() == ast::UnaryOp::kAddressOf &&
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inner->op() == ast::UnaryOp::kIndirection) {
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// &(*(expr)) => expr
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return ctx.Clone(inner->expr());
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}
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if (outer->op() == ast::UnaryOp::kIndirection &&
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inner->op() == ast::UnaryOp::kAddressOf) {
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// *(&(expr)) => expr
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return ctx.Clone(inner->expr());
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}
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}
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}
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return nullptr;
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});
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ctx.Clone();
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return Output(Program(std::move(out)));
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}
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} // namespace transform
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} // namespace tint
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