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[analysis] Add a lattice for value types #6064
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,82 @@ | ||
| /* | ||
| * Copyright 2023 WebAssembly Community Group participants | ||
| * | ||
| * 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 wasm_analysis_lattices_valtype_h | ||
| #define wasm_analysis_lattices_valtype_h | ||
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| #include "../lattice.h" | ||
| #include "wasm-type.h" | ||
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| namespace wasm::analysis { | ||
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| // Thin wrapper around `wasm::Type` giving it the interface of a lattice. As | ||
| // usual, `Type::unreachable` is the bottom element, but unlike in the | ||
| // underlying API, we uniformly treat `Type::none` as the top type so that we | ||
| // have a proper lattice. | ||
| struct ValType { | ||
| using Element = Type; | ||
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| Element getBottom() const noexcept { return Type::unreachable; } | ||
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| Element getTop() const noexcept { return Type::none; } | ||
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| LatticeComparison compare(Element a, Element b) const noexcept { | ||
| if (a == b) { | ||
| return EQUAL; | ||
| } | ||
| if (b == Type::none || Type::isSubType(a, b)) { | ||
| return LESS; | ||
| } | ||
| if (a == Type::none || Type::isSubType(b, a)) { | ||
| return GREATER; | ||
| } | ||
| return NO_RELATION; | ||
| } | ||
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| bool join(Element& joinee, Element joiner) const noexcept { | ||
| // `getLeastUpperBound` already treats `Type::none` as top. | ||
| auto lub = Type::getLeastUpperBound(joinee, joiner); | ||
| if (lub != joinee) { | ||
| joinee = lub; | ||
| return true; | ||
| } | ||
| return false; | ||
| } | ||
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| bool meet(Element& meetee, Element meeter) const noexcept { | ||
| if (meetee == meeter || meeter == Type::none) { | ||
| return false; | ||
| } | ||
| if (meetee == Type::none) { | ||
| meetee = meeter; | ||
| return true; | ||
| } | ||
| auto glb = Type::getGreatestLowerBound(meetee, meeter); | ||
| if (glb != meetee) { | ||
| meetee = glb; | ||
| return true; | ||
| } | ||
| return false; | ||
| } | ||
| }; | ||
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| #if __cplusplus >= 202002L | ||
| static_assert(FullLattice<ValType>); | ||
| #endif | ||
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| } // namespace wasm::analysis | ||
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| #endif // wasm_analysis_lattices_valtype_h |
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Why not i64, f64?
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I don't think adding them (or v128, or other reference types) would add much, since their relationships to other types isn't any different than what is already covered here.
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Fair enough. Comment might be worthwhile as it's an obvious question for a reader of the code to have I think.
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Will do 👍