| // 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/for_loop_to_loop.h" |
| |
| #include "src/ast/break_statement.h" |
| #include "src/program_builder.h" |
| |
| TINT_INSTANTIATE_TYPEINFO(tint::transform::ForLoopToLoop); |
| |
| namespace tint { |
| namespace transform { |
| ForLoopToLoop::ForLoopToLoop() = default; |
| |
| ForLoopToLoop::~ForLoopToLoop() = default; |
| |
| bool ForLoopToLoop::ShouldRun(const Program* program, const DataMap&) const { |
| for (auto* node : program->ASTNodes().Objects()) { |
| if (node->Is<ast::ForLoopStatement>()) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| void ForLoopToLoop::Run(CloneContext& ctx, const DataMap&, DataMap&) const { |
| ctx.ReplaceAll( |
| [&](const ast::ForLoopStatement* for_loop) -> const ast::Statement* { |
| ast::StatementList stmts; |
| if (auto* cond = for_loop->condition) { |
| // !condition |
| auto* not_cond = ctx.dst->create<ast::UnaryOpExpression>( |
| ast::UnaryOp::kNot, ctx.Clone(cond)); |
| |
| // { break; } |
| auto* break_body = |
| ctx.dst->Block(ctx.dst->create<ast::BreakStatement>()); |
| |
| // if (!condition) { break; } |
| stmts.emplace_back(ctx.dst->If(not_cond, break_body)); |
| } |
| for (auto* stmt : for_loop->body->statements) { |
| stmts.emplace_back(ctx.Clone(stmt)); |
| } |
| |
| const ast::BlockStatement* continuing = nullptr; |
| if (auto* cont = for_loop->continuing) { |
| continuing = ctx.dst->Block(ctx.Clone(cont)); |
| } |
| |
| auto* body = ctx.dst->Block(stmts); |
| auto* loop = ctx.dst->create<ast::LoopStatement>(body, continuing); |
| |
| if (auto* init = for_loop->initializer) { |
| return ctx.dst->Block(ctx.Clone(init), loop); |
| } |
| |
| return loop; |
| }); |
| |
| ctx.Clone(); |
| } |
| |
| } // namespace transform |
| } // namespace tint |