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perf: don't create holey arrays (#32155)

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Don't use `Array` constructor with the size value (ex. `new Array(5)`) - this will create a `HOLEY_ELEMENTS` array (even if this array is filled in later on!);

https://v8.dev/blog/elements-kinds
https://stackoverflow.com/questions/32054170/how-to-resize-an-array

PR Close #32155
This commit is contained in:
Miško Hevery
2019-08-15 13:42:17 -07:00
committed by Andrew Kushnir
parent c957dfc167
commit 64770571b2
32 changed files with 137 additions and 83 deletions
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5
packages/compiler/src/aot/compiler.ts
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@ -14,7 +14,6 @@ import {MessageBundle} from '../i18n/message_bundle';
import {Identifiers, createTokenForExternalReference} from '../identifiers';
import {InjectableCompiler} from '../injectable_compiler';
import {CompileMetadataResolver} from '../metadata_resolver';
import * as html from '../ml_parser/ast';
import {HtmlParser} from '../ml_parser/html_parser';
import {removeWhitespaces} from '../ml_parser/html_whitespaces';
import {DEFAULT_INTERPOLATION_CONFIG, InterpolationConfig} from '../ml_parser/interpolation_config';
@ -32,7 +31,7 @@ import {SummaryResolver} from '../summary_resolver';
import {BindingParser} from '../template_parser/binding_parser';
import {TemplateAst} from '../template_parser/template_ast';
import {TemplateParser} from '../template_parser/template_parser';
import {OutputContext, ValueVisitor, error, syntaxError, visitValue} from '../util';
import {OutputContext, ValueVisitor, error, newArray, syntaxError, visitValue} from '../util';
import {TypeCheckCompiler} from '../view_compiler/type_check_compiler';
import {ViewCompileResult, ViewCompiler} from '../view_compiler/view_compiler';
@ -690,7 +689,7 @@ export class AotCompiler {
const suppliedTypeParams = typeParams || [];
const missingTypeParamsCount = arity - suppliedTypeParams.length;
const allTypeParams =
suppliedTypeParams.concat(new Array(missingTypeParamsCount).fill(o.DYNAMIC_TYPE));
suppliedTypeParams.concat(newArray(missingTypeParamsCount, o.DYNAMIC_TYPE));
return members.reduce(
(expr, memberName) => expr.prop(memberName),
<o.Expression>o.importExpr(