forked from rollup/rollup
/
ObjectExpression.ts
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/
ObjectExpression.ts
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import MagicString from 'magic-string';
import { BLANK } from '../../utils/blank';
import { getOrCreate } from '../../utils/getOrCreate';
import { NodeRenderOptions, RenderOptions } from '../../utils/renderHelpers';
import { CallOptions } from '../CallOptions';
import { DeoptimizableEntity } from '../DeoptimizableEntity';
import { HasEffectsContext } from '../ExecutionContext';
import {
EMPTY_PATH,
ObjectPath,
PathTracker,
SHARED_RECURSION_TRACKER,
UNKNOWN_PATH
} from '../utils/PathTracker';
import {
getMemberReturnExpressionWhenCalled,
hasMemberEffectWhenCalled,
LiteralValueOrUnknown,
objectMembers,
UnknownValue,
UNKNOWN_EXPRESSION
} from '../values';
import Identifier from './Identifier';
import Literal from './Literal';
import * as NodeType from './NodeType';
import Property from './Property';
import { ExpressionEntity } from './shared/Expression';
import { NodeBase } from './shared/Node';
import SpreadElement from './SpreadElement';
interface PropertyMap {
[key: string]: {
exactMatchRead: Property | null;
exactMatchWrite: Property | null;
propertiesRead: (Property | SpreadElement)[];
propertiesWrite: Property[];
};
}
export default class ObjectExpression extends NodeBase implements DeoptimizableEntity {
properties!: (Property | SpreadElement)[];
type!: NodeType.tObjectExpression;
private deoptimizedPaths = new Set<string>();
// We collect deoptimization information if we can resolve a computed property access
private expressionsToBeDeoptimized = new Map<string, DeoptimizableEntity[]>();
private hasUnknownDeoptimizedProperty = false;
private propertyMap: PropertyMap | null = null;
private unmatchablePropertiesRead: (Property | SpreadElement)[] = [];
private unmatchablePropertiesWrite: Property[] = [];
bind() {
super.bind();
// ensure the propertyMap is set for the tree-shaking passes
this.getPropertyMap();
if (
!this.hasUnknownDeoptimizedProperty &&
this.properties.some(prop => {
if (prop instanceof SpreadElement || prop.computed) return false;
if (prop.key instanceof Identifier) return prop.key.name == "__proto__";
return String((prop.key as Literal).value) == "__proto__";
})
) {
this.deoptimizeAllProperties();
}
}
// We could also track this per-property but this would quickly become much more complex
deoptimizeCache() {
if (!this.hasUnknownDeoptimizedProperty) this.deoptimizeAllProperties();
}
deoptimizePath(path: ObjectPath) {
if (this.hasUnknownDeoptimizedProperty) return;
const propertyMap = this.getPropertyMap();
const key = path[0];
if (path.length === 1) {
if (typeof key !== 'string') {
this.deoptimizeAllProperties();
return;
}
if (!this.deoptimizedPaths.has(key)) {
this.deoptimizedPaths.add(key);
// we only deoptimizeCache exact matches as in all other cases,
// we do not return a literal value or return expression
const expressionsToBeDeoptimized = this.expressionsToBeDeoptimized.get(key);
if (expressionsToBeDeoptimized) {
for (const expression of expressionsToBeDeoptimized) {
expression.deoptimizeCache();
}
}
}
}
const subPath = path.length === 1 ? UNKNOWN_PATH : path.slice(1);
for (const property of typeof key === 'string'
? propertyMap[key]
? propertyMap[key].propertiesRead
: []
: this.properties) {
property.deoptimizePath(subPath);
}
}
getLiteralValueAtPath(
path: ObjectPath,
recursionTracker: PathTracker,
origin: DeoptimizableEntity
): LiteralValueOrUnknown {
const propertyMap = this.getPropertyMap();
const key = path[0];
if (
path.length === 0 ||
this.hasUnknownDeoptimizedProperty ||
typeof key !== 'string' ||
this.deoptimizedPaths.has(key)
) {
return UnknownValue;
}
if (
path.length === 1 &&
!propertyMap[key] &&
!objectMembers[key] &&
this.unmatchablePropertiesRead.length === 0
) {
getOrCreate(this.expressionsToBeDeoptimized, key, () => []).push(origin);
return undefined;
}
if (
!propertyMap[key] ||
propertyMap[key].exactMatchRead === null ||
propertyMap[key].propertiesRead.length > 1
) {
return UnknownValue;
}
getOrCreate(this.expressionsToBeDeoptimized, key, () => []).push(origin);
return propertyMap[key].exactMatchRead!.getLiteralValueAtPath(
path.slice(1),
recursionTracker,
origin
);
}
getReturnExpressionWhenCalledAtPath(
path: ObjectPath,
recursionTracker: PathTracker,
origin: DeoptimizableEntity
): ExpressionEntity {
const propertyMap = this.getPropertyMap();
const key = path[0];
if (
path.length === 0 ||
this.hasUnknownDeoptimizedProperty ||
typeof key !== 'string' ||
this.deoptimizedPaths.has(key)
) {
return UNKNOWN_EXPRESSION;
}
if (
path.length === 1 &&
objectMembers[key] &&
this.unmatchablePropertiesRead.length === 0 &&
(!propertyMap[key] || propertyMap[key].exactMatchRead === null)
) {
return getMemberReturnExpressionWhenCalled(objectMembers, key);
}
if (
!propertyMap[key] ||
propertyMap[key].exactMatchRead === null ||
propertyMap[key].propertiesRead.length > 1
) {
return UNKNOWN_EXPRESSION;
}
getOrCreate(this.expressionsToBeDeoptimized, key, () => []).push(origin);
return propertyMap[key].exactMatchRead!.getReturnExpressionWhenCalledAtPath(
path.slice(1),
recursionTracker,
origin
);
}
hasEffectsWhenAccessedAtPath(path: ObjectPath, context: HasEffectsContext) {
if (path.length === 0) return false;
const key = path[0];
const propertyMap = this.propertyMap!;
if (
path.length > 1 &&
(this.hasUnknownDeoptimizedProperty ||
typeof key !== 'string' ||
this.deoptimizedPaths.has(key) ||
!propertyMap[key] ||
propertyMap[key].exactMatchRead === null)
)
return true;
const subPath = path.slice(1);
for (const property of typeof key !== 'string'
? this.properties
: propertyMap[key]
? propertyMap[key].propertiesRead
: []) {
if (property.hasEffectsWhenAccessedAtPath(subPath, context)) return true;
}
return false;
}
hasEffectsWhenAssignedAtPath(path: ObjectPath, context: HasEffectsContext) {
const key = path[0];
const propertyMap = this.propertyMap!;
if (
path.length > 1 &&
(this.hasUnknownDeoptimizedProperty ||
this.deoptimizedPaths.has(key as string) ||
!propertyMap[key as string] ||
propertyMap[key as string].exactMatchRead === null)
) {
return true;
}
const subPath = path.slice(1);
for (const property of typeof key !== 'string'
? this.properties
: path.length > 1
? propertyMap[key].propertiesRead
: propertyMap[key]
? propertyMap[key].propertiesWrite
: []) {
if (property.hasEffectsWhenAssignedAtPath(subPath, context)) return true;
}
return false;
}
hasEffectsWhenCalledAtPath(
path: ObjectPath,
callOptions: CallOptions,
context: HasEffectsContext
): boolean {
const key = path[0];
if (
typeof key !== 'string' ||
this.hasUnknownDeoptimizedProperty ||
this.deoptimizedPaths.has(key) ||
(this.propertyMap![key]
? !this.propertyMap![key].exactMatchRead
: path.length > 1 || !objectMembers[key])
) {
return true;
}
const subPath = path.slice(1);
if (this.propertyMap![key]) {
for (const property of this.propertyMap![key].propertiesRead) {
if (property.hasEffectsWhenCalledAtPath(subPath, callOptions, context)) return true;
}
}
if (path.length === 1 && objectMembers[key])
return hasMemberEffectWhenCalled(objectMembers, key, this.included, callOptions, context);
return false;
}
render(
code: MagicString,
options: RenderOptions,
{ renderedParentType, renderedSurroundingElement }: NodeRenderOptions = BLANK
) {
super.render(code, options);
const surroundingElement = renderedParentType || renderedSurroundingElement;
if (
surroundingElement === NodeType.ExpressionStatement ||
surroundingElement === NodeType.ArrowFunctionExpression
) {
code.appendRight(this.start, '(');
code.prependLeft(this.end, ')');
}
}
private deoptimizeAllProperties() {
this.hasUnknownDeoptimizedProperty = true;
for (const property of this.properties) {
property.deoptimizePath(UNKNOWN_PATH);
}
for (const expressionsToBeDeoptimized of this.expressionsToBeDeoptimized.values()) {
for (const expression of expressionsToBeDeoptimized) {
expression.deoptimizeCache();
}
}
}
private getPropertyMap(): PropertyMap {
if (this.propertyMap !== null) {
return this.propertyMap;
}
const propertyMap = (this.propertyMap = Object.create(null));
for (let index = this.properties.length - 1; index >= 0; index--) {
const property = this.properties[index];
if (property instanceof SpreadElement) {
this.unmatchablePropertiesRead.push(property);
continue;
}
const isWrite = property.kind !== 'get';
const isRead = property.kind !== 'set';
let key;
if (property.computed) {
const keyValue = property.key.getLiteralValueAtPath(
EMPTY_PATH,
SHARED_RECURSION_TRACKER,
this
);
if (keyValue === UnknownValue) {
if (isRead) {
this.unmatchablePropertiesRead.push(property);
} else {
this.unmatchablePropertiesWrite.push(property);
}
continue;
}
key = String(keyValue);
} else if (property.key instanceof Identifier) {
key = property.key.name;
} else {
key = String((property.key as Literal).value);
}
const propertyMapProperty = propertyMap[key];
if (!propertyMapProperty) {
propertyMap[key] = {
exactMatchRead: isRead ? property : null,
exactMatchWrite: isWrite ? property : null,
propertiesRead: isRead ? [property, ...this.unmatchablePropertiesRead] : [],
propertiesWrite: isWrite && !isRead ? [property, ...this.unmatchablePropertiesWrite] : []
};
continue;
}
if (isRead && propertyMapProperty.exactMatchRead === null) {
propertyMapProperty.exactMatchRead = property;
propertyMapProperty.propertiesRead.push(property, ...this.unmatchablePropertiesRead);
}
if (isWrite && !isRead && propertyMapProperty.exactMatchWrite === null) {
propertyMapProperty.exactMatchWrite = property;
propertyMapProperty.propertiesWrite.push(property, ...this.unmatchablePropertiesWrite);
}
}
return propertyMap;
}
}