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fixpoint algorithm: parameterize the Map to use

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This commit is contained in:
Joeri Exelmans 2025-05-22 14:31:26 +02:00
parent ea878975be
commit 47786ae792
3 changed files with 58 additions and 10 deletions
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13
lib/util/fixpoint.js
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@ -4,10 +4,12 @@
// FRANCOIS POTTIER,<a href="https://gallium.inria.fr/~fpottier/publis/fpottier-fix.pdf"> Lazy Least Fixed Points in ML</a>
// <a href="https://gitlab.inria.fr/fpottier/fix">OCAML Code</a>
export const fixer = (eqsFunction, lattice) => {
const mFixed = new Map();
const mTransient = new Map();
const mParents = new Map();
// eqsFunction: V -> (V -> P) -> P
// elemCmp: (V -> V -> Ordering)
export const fixer = (eqsFunction, dictType, lattice) => {
const mFixed = dictType();
const mTransient = dictType();
const mParents = dictType();
const mWorkset = []; // Note: we use a Stack (LIFO), but FIFO queue or any other collection would also work.
@ -16,7 +18,6 @@ export const fixer = (eqsFunction, lattice) => {
const ensureTransient = node => {
if (mTransient.has(node)) return;
mTransient.set(node, lattice.bottom());
mParents.set(node, []);
mWorkset.push(node);
}
@ -47,7 +48,7 @@ export const fixer = (eqsFunction, lattice) => {
}
if (!lattice.equality(mTransient.get(current), newProperty)) {
mTransient.put(current, newProperty);
mTransient.set(current, newProperty);
mWorkset.push(...(mParents.get(current) || []));
}
}