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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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3
packages/compiler/test/output/js_emitter_spec.ts
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@ -9,6 +9,7 @@
import {StaticSymbol} from '@angular/compiler/src/aot/static_symbol';
import {JavaScriptEmitter} from '@angular/compiler/src/output/js_emitter';
import * as o from '@angular/compiler/src/output/output_ast';
import {newArray} from '@angular/compiler/src/util';
import {stripSourceMapAndNewLine} from './abstract_emitter_spec';
@ -108,7 +109,7 @@ const externalModuleIdentifier = new o.ExternalReference(anotherModuleUrl, 'some
});
it('should break expressions into multiple lines if they are too long', () => {
const values: o.Expression[] = new Array(100);
const values: o.Expression[] = newArray(100);
values.fill(o.literal(1));
values.splice(50, 0, o.fn([], [new o.ReturnStatement(o.literal(1))]));
expect(emitStmt(o.variable('fn').callFn(values).toStmt())).toEqual([

5
packages/compiler/test/output/output_jit_spec.ts
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@ -10,6 +10,7 @@ import {EmitterVisitorContext} from '@angular/compiler/src/output/abstract_emitt
import * as o from '@angular/compiler/src/output/output_ast';
import {JitEmitterVisitor, JitEvaluator} from '@angular/compiler/src/output/output_jit';
import {R3JitReflector} from '@angular/compiler/src/render3/r3_jit';
import {newArray} from '@angular/compiler/src/util';
import {JitReflector} from '@angular/platform-browser-dynamic/src/compiler_reflector';
const anotherModuleUrl = 'somePackage/someOtherPath';
@ -18,10 +19,10 @@ const anotherModuleUrl = 'somePackage/someOtherPath';
describe('Output JIT', () => {
describe('regression', () => {
it('should generate unique argument names', () => {
const externalIds = new Array(10).fill(1).map(
const externalIds = newArray(10, 1).map(
(_, index) =>
new o.ExternalReference(anotherModuleUrl, `id_${index}_`, {name: `id_${index}_`}));
const externalIds1 = new Array(10).fill(1).map(
const externalIds1 = newArray(10, 1).map(
(_, index) => new o.ExternalReference(
anotherModuleUrl, `id_${index}_1`, {name: `id_${index}_1`}));
const ctx = EmitterVisitorContext.createRoot();

4
packages/compiler/test/output/ts_emitter_spec.ts
View File

@ -10,6 +10,8 @@ import {StaticSymbol} from '@angular/compiler/src/aot/static_symbol';
import * as o from '@angular/compiler/src/output/output_ast';
import {TypeScriptEmitter} from '@angular/compiler/src/output/ts_emitter';
import {ParseLocation, ParseSourceFile, ParseSourceSpan} from '@angular/compiler/src/parse_util';
import {newArray} from '@angular/compiler/src/util';
import {stripSourceMapAndNewLine} from './abstract_emitter_spec';
const someGenFilePath = 'somePackage/someGenFile';
@ -160,7 +162,7 @@ const externalModuleIdentifier = new o.ExternalReference(anotherModuleUrl, 'some
});
it('should break expressions into multiple lines if they are too long', () => {
const values: o.Expression[] = new Array(100);
const values: o.Expression[] = newArray(100);
values.fill(o.literal(1));
values.splice(50, 0, o.fn([], [new o.ReturnStatement(o.literal(1))]));
expect(emitStmt(o.variable('fn').callFn(values).toStmt())).toEqual([