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Add constructor functions for {Symbol,Node}Links (#36845)

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Using a constructor function like this can help node better optimize
object allocation. This improves memory usage when compiling
`src/compiler` from **277M** to **270M**, a nice ~3% win.
This commit is contained in:
Arpad Borsos
2020-03-11 16:40:51 +01:00
committed by GitHub
parent 20625a964b
commit 5937ffdf25
1 changed files with 9 additions and 2 deletions
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11
src/compiler/checker.ts
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@@ -242,6 +242,13 @@ namespace ts {
ExportNamespace = 1 << 2,
}
function SymbolLinks(this: SymbolLinks) {
}
function NodeLinks(this: NodeLinks) {
this.flags = 0;
}
export function getNodeId(node: Node): number {
if (!node.id) {
node.id = nextNodeId;
@@ -1271,12 +1278,12 @@ namespace ts {
function getSymbolLinks(symbol: Symbol): SymbolLinks {
if (symbol.flags & SymbolFlags.Transient) return <TransientSymbol>symbol;
const id = getSymbolId(symbol);
return symbolLinks[id] || (symbolLinks[id] = {});
return symbolLinks[id] || (symbolLinks[id] = new (<any>SymbolLinks)());
}
function getNodeLinks(node: Node): NodeLinks {
const nodeId = getNodeId(node);
return nodeLinks[nodeId] || (nodeLinks[nodeId] = { flags: 0 } as NodeLinks);
return nodeLinks[nodeId] || (nodeLinks[nodeId] = new (<any>NodeLinks)());
}
function isGlobalSourceFile(node: Node) {