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// Copyright 2023 The Dawn & Tint Authors
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
// list of conditions and the following disclaimer.
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// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
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// 3. Neither the name of the copyright holder nor the names of its
// contributors may be used to endorse or promote products derived from
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#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_