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https://github.com/encounter/dawn-cmake.git
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91d39a7639
Uniformity analysis can have very deep call stacks, and we're on the cusp of stack overflowing. Reducing these sizes helps avoid cache misses at the cost of more heap allocations. Change-Id: I4685d1d888d062456c296d9dc25231a48d72e941 Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/116878 Kokoro: Kokoro <noreply+kokoro@google.com> Reviewed-by: Dan Sinclair <dsinclair@chromium.org> Commit-Queue: Ben Clayton <bclayton@google.com>
85 lines
2.4 KiB
C++
85 lines
2.4 KiB
C++
// Copyright 2020 The Tint Authors. //
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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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#ifndef SRC_TINT_SCOPE_STACK_H_
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#define SRC_TINT_SCOPE_STACK_H_
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#include <utility>
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#include "src/tint/symbol.h"
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#include "src/tint/utils/hashmap.h"
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#include "src/tint/utils/vector.h"
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namespace tint {
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/// Used to store a stack of scope information.
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/// The stack starts with a global scope which can not be popped.
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template <class K, class V>
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class ScopeStack {
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public:
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/// Push a new scope on to the stack
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void Push() { stack_.Push({}); }
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/// Pop the scope off the top of the stack
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void Pop() {
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if (stack_.Length() > 1) {
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stack_.Pop();
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}
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}
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/// Assigns the value into the top most scope of the stack.
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/// @param key the key of the value
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/// @param val the value
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/// @returns the old value if there was an existing key at the top of the
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/// stack, otherwise the zero initializer for type T.
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V Set(const K& key, V val) {
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auto& back = stack_.Back();
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if (auto el = back.Find(key)) {
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std::swap(val, *el);
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return val;
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}
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back.Add(key, val);
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return {};
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}
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/// Retrieves a value from the stack
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/// @param key the key to look for
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/// @returns the value, or the zero initializer if the value was not found
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V Get(const K& key) const {
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for (auto iter = stack_.rbegin(); iter != stack_.rend(); ++iter) {
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if (auto val = iter->Find(key)) {
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return *val;
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}
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}
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return V{};
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}
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/// Return the top scope of the stack.
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/// @returns the top scope of the stack
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const utils::Hashmap<K, V, 4>& Top() const { return stack_.Back(); }
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/// Clear the scope stack.
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void Clear() {
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stack_.Clear();
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stack_.Push({});
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}
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private:
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utils::Vector<utils::Hashmap<K, V, 4>, 8> stack_ = {{}};
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};
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} // namespace tint
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#endif // SRC_TINT_SCOPE_STACK_H_
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