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Framework for copy-on-write visitors (WIP)
Signed-off-by: Chris Dodd <cdodd@nvidia.com>
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| Original file line number | Diff line number | Diff line change |
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| /* | ||
| Copyright 2024 NVIDIA CORPORATION. | ||
| 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. | ||
| */ | ||
|
|
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| #ifndef IR_COPY_ON_WRITE_INL_H_ | ||
| #define IR_COPY_ON_WRITE_INL_H_ | ||
|
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| /* template methods declared in "copy_on_write_ptr.h" that can't be defined there | ||
| * due to order-of-declaration issues. */ | ||
|
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| namespace P4::IR { | ||
|
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| template<class T> const T *COWinfo<T>::get() const { | ||
| if (clone) return clone->checkedTo<T>(); | ||
| return orig->checkedTo<T>(); | ||
| } | ||
|
|
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| template<class T> const T *COWinfo<T>::getOrig() const { | ||
| return orig->checkedTo<T>(); | ||
| } | ||
|
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| template<class T> T *COWinfo<T>::mkClone() { | ||
| if (!clone) clone = orig->clone(); | ||
| return clone->checkedTo<T>(); | ||
| } | ||
|
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| template<class T> T *COWinfo<T>::getClone() const { | ||
| BUG_CHECK(clone != nullptr, "Not yet cloned in getClone"); | ||
| return clone->checkedTo<T>(); | ||
| } | ||
|
|
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| /* specializations for IR::Node pointers */ | ||
| template <class T, typename U, const U *T::*field> | ||
| requires std::derived_from<U, Node> | ||
| struct COWfieldref<T, const U *, field> { | ||
| COWinfo<T> *info; | ||
|
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| const U *get() const { return info->get()->*field; } | ||
| operator const U *() const { return get(); } | ||
| const U *operator=(const U *val) const { | ||
| if (!info->isCloned() && info->get()->*field == val) return val; | ||
| return info->mkClone()->*field = val; | ||
| } | ||
| void set(const U *val) const { *this = val; } | ||
| template<typename V> requires (std::is_base_of_v<V, U> && !std::same_as<V, U>) | ||
| void set(const V *val) const { *this = val ? val->template checkedTo<U>() : (U *)nullptr; } | ||
| const U *operator->() const { return get(); } | ||
| const U &operator*() const { return *get(); } | ||
| }; | ||
|
|
||
| template<class T, class C, class U, C T::*field> | ||
| struct COW_element_ref { | ||
| COWinfo<T> *info; | ||
| bool is_const; | ||
| union { | ||
| typename C::const_iterator ci; | ||
| typename C::iterator ni; | ||
| }; | ||
| COW_element_ref(COWinfo<T> *inf, typename C::const_iterator i) | ||
| : info(inf), is_const(true) { ci = i; } | ||
| COW_element_ref(COWinfo<T> *inf, typename C::iterator i) | ||
| : info(inf), is_const(false) { ni = i; } | ||
| void clone_fixup() { | ||
| if (is_const) { | ||
| // messy problem -- need to clone (iff not yet cloned) and then find the | ||
| // corresponding iterator in the clone | ||
| auto i = (info->mkClone()->*field).begin(); | ||
| auto &orig_vec = info->getOrig()->*field; | ||
| for (auto oi = orig_vec.begin(); oi != ci; ++oi, ++i) | ||
| BUG_CHECK(oi != orig_vec.end(), "Invalid iterator in clone_fixup"); | ||
| ni = i; | ||
| is_const = false; | ||
| } | ||
| } | ||
| U get() { | ||
| if (is_const && info->isCloned()) clone_fixup(); | ||
| return *ci; | ||
| } | ||
| operator U() { | ||
| if (is_const && info->isCloned()) clone_fixup(); | ||
| return *ci; | ||
| } | ||
| U operator=(U val) { | ||
| clone_fixup(); | ||
| return *ni = val; | ||
| } | ||
| void set(U val) { | ||
| clone_fixup(); | ||
| *ni = val; | ||
| } | ||
| void set(const Node *val) requires std::is_pointer_v<U> | ||
| { | ||
| set(val ? val->checkedTo<std::remove_pointer<U>::type>() : (U)nullptr); | ||
| } | ||
| }; | ||
|
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| template<class T, class C, class U, C T::*field> | ||
| struct COW_iterator { | ||
| COW_element_ref<T, C, U, field> ref; | ||
| COW_iterator(COWinfo<T> *inf, typename C::const_iterator i) : ref(inf, i) {} | ||
| COW_iterator(COWinfo<T> *inf, typename C::iterator i) : ref(inf, i) {} | ||
| COW_iterator &operator++() { ++ref.ci; return *this; } | ||
| COW_iterator operator++(int) { COW_iterator<T, C, U, field> rv = *this; ++ref.ci; return rv; } | ||
| COW_iterator &operator--() { --ref.ci; return *this; } | ||
| COW_iterator operator--(int) { COW_iterator<T, C, U, field> rv = *this; --ref.ci; return rv; } | ||
| bool operator==(const COW_iterator<T, C, U, field> &i) const { return ref.ci == i.ref.ci; } | ||
| bool operator!=(const COW_iterator<T, C, U, field> &i) const { return ref.ci != i.ref.ci; } | ||
| COW_element_ref<T, C, U, field> &operator *() { return ref; } | ||
| }; | ||
|
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|
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| /* specialization for safe_vector */ | ||
| template <class T, typename U, safe_vector<U> T::*field> | ||
| struct COWfieldref<T, safe_vector<U>, field> { | ||
| COWinfo<T> *info; | ||
|
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| using iterator = COW_iterator<T, safe_vector<U>, U, field>; | ||
|
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| void visit_children(Visitor &) { BUG("TBD"); } | ||
|
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| const safe_vector<U> &get() const { return info->get()->*field; } | ||
| safe_vector<U> &modify() const { return info->mkClone()->*field; } | ||
| operator const safe_vector<U>&() const { return get(); } | ||
| safe_vector<U> &operator=(const safe_vector<U> &val) const { return modify() = val; } | ||
| safe_vector<U> &operator=(safe_vector<U> &&val) const { return modify() = std::move(val); } | ||
| iterator begin() { | ||
| if (info->isCloned()) | ||
| return iterator(info, (info->getClone()->*field).begin()); | ||
| else | ||
| return iterator(info, (info->get()->*field).begin()); | ||
| } | ||
| iterator end() { | ||
| if (info->isCloned()) | ||
| return iterator(info, (info->getClone()->*field).begin()); | ||
| else | ||
| return iterator(info, (info->get()->*field).begin()); | ||
| } | ||
| // FIXME need to add insert/appeand/prepend/emplace_back specializations | ||
| }; | ||
|
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|
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| /* specializations for IR::Vector */ | ||
| template <class T, typename U, Vector<U> T::*field> | ||
| struct COWfieldref<T, Vector<U>, field> { | ||
| COWinfo<T> *info; | ||
|
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| using iterator = COW_iterator<T, Vector<U>, const U *, field>; | ||
|
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| void visit_children(Visitor &) { BUG("TBD"); } | ||
|
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| const Vector<U> &get() const { return info->get()->*field; } | ||
| Vector<U> &modify() const { return info->mkClone()->*field; } | ||
| operator const Vector<U>&() const { return get(); } | ||
| Vector<U> &operator=(const Vector<U> &val) const { return modify() = val; } | ||
| Vector<U> &operator=(Vector<U> &&val) const { return modify() = std::move(val); } | ||
| iterator begin() { | ||
| if (info->isCloned()) | ||
| return iterator(info, (info->getClone()->*field).begin()); | ||
| else | ||
| return iterator(info, (info->get()->*field).begin()); | ||
| } | ||
| iterator end() { | ||
| if (info->isCloned()) | ||
| return iterator(info, (info->getClone()->*field).begin()); | ||
| else | ||
| return iterator(info, (info->get()->*field).begin()); | ||
| } | ||
| iterator erase(iterator i) { | ||
| i.ref.clone_fixup(); | ||
| Vector<U> &vec = info->getClone()->*field; | ||
| return iterator(info, vec.erase(i.ref.ni)); | ||
| } | ||
| // FIXME need to add insert/appeand/prepend/emplace_back specializations | ||
| }; | ||
|
|
||
| /* specializations for IR::IndexedVector */ | ||
| template <class T, typename U, IndexedVector<U> T::*field> | ||
| struct COWfieldref<T, IndexedVector<U>, field> { | ||
| COWinfo<T> *info; | ||
|
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| using iterator = COW_iterator<T, IndexedVector<U>, const U *, field>; | ||
|
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| void visit_children(Visitor &) { BUG("TBD"); } | ||
|
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| const IndexedVector<U> &get() const { return info->get()->*field; } | ||
| IndexedVector<U> &modify() const { return info->mkClone()->*field; } | ||
| operator const IndexedVector<U>&() const { return get(); } | ||
| IndexedVector<U> &operator=(const IndexedVector<U> &val) const { return modify() = val; } | ||
| IndexedVector<U> &operator=(IndexedVector<U> &&val) const { return modify() = std::move(val); } | ||
| iterator begin() { | ||
| if (info->isCloned()) | ||
| return iterator(info, (info->getClone()->*field).begin()); | ||
| else | ||
| return iterator(info, (info->get()->*field).begin()); | ||
| } | ||
| iterator end() { | ||
| if (info->isCloned()) | ||
| return iterator(info, (info->getClone()->*field).begin()); | ||
| else | ||
| return iterator(info, (info->get()->*field).begin()); | ||
| } | ||
| iterator erase(iterator i) { | ||
| i.ref.clone_fixup(); | ||
| IndexedVector<U> &vec = info->getClone()->*field; | ||
| return iterator(info, vec.erase(i.ref.ni)); | ||
| } | ||
| // FIXME need to add insert/appeand/prepend/emplace_back/removeByName specializations | ||
| }; | ||
|
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| /* specializations for IR::NameMap */ | ||
| template <class T, typename U, | ||
| template <class K, class V, class COMP, class ALLOC> class MAP, | ||
| NameMap<U, MAP> T::*field> | ||
| struct COWfieldref<T, NameMap<U, MAP>, field> { | ||
| COWinfo<T> *info; | ||
|
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| using iterator = COW_iterator<T, NameMap<U, MAP>, const U *, field>; | ||
|
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| void visit_children(Visitor &) { BUG("TBD"); } | ||
| }; | ||
|
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| // FIXME -- need NodeMap specializations if any backend ever uses that template | ||
|
|
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| } // namespace P4::IR | ||
|
|
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| #endif /* IR_COPY_ON_WRITE_INL_H_ */ |
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