| // Copyright 2023 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. |
| |
| #ifndef SRC_TINT_LANG_CORE_IR_TRAVERSE_H_ |
| #define SRC_TINT_LANG_CORE_IR_TRAVERSE_H_ |
| |
| #include "src/tint/lang/core/ir/block.h" |
| #include "src/tint/lang/core/ir/control_instruction.h" |
| #include "src/tint/utils/containers/reverse.h" |
| #include "src/tint/utils/containers/vector.h" |
| #include "src/tint/utils/traits/traits.h" |
| |
| namespace tint::core::ir { |
| |
| /// Traverse calls @p callback with each instruction in @p block and all child blocks of @p block |
| /// that matches the callback parameter type. |
| /// @param block the block to traverse |
| /// @param callback a function with the signature `void(T*)` |
| template <typename CALLBACK> |
| void Traverse(Block* block, CALLBACK&& callback) { |
| using T = std::remove_pointer_t<traits::ParameterType<CALLBACK, 0>>; |
| |
| Vector<ir::Instruction*, 8> queue; |
| if (!block->IsEmpty()) { |
| queue.Push(block->Front()); |
| } |
| while (!queue.IsEmpty()) { |
| for (auto* inst = queue.Pop(); inst != nullptr; inst = inst->next) { |
| if (auto* as_t = inst->As<T>()) { |
| callback(as_t); |
| } |
| if (auto* ctrl = inst->As<ControlInstruction>()) { |
| if (auto* next = inst->next) { |
| queue.Push(next); // Resume iteration of this block |
| } |
| |
| Vector<ir::Instruction*, 8> children; |
| ctrl->ForeachBlock([&](ir::Block* b) { |
| if (!b->IsEmpty()) { |
| children.Push(b->Front()); |
| } |
| }); |
| for (auto* child : Reverse(children)) { |
| queue.Push(child); |
| } |
| break; |
| } |
| } |
| } |
| } |
| |
| } // namespace tint::core::ir |
| |
| #endif // SRC_TINT_LANG_CORE_IR_TRAVERSE_H_ |