dawn-cmake/src/transform/simplify.cc

64 lines
1.8 KiB
C++

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