/
FunctionBase.ts
168 lines (155 loc) · 5.03 KB
/
FunctionBase.ts
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import type { NormalizedTreeshakingOptions } from '../../../rollup/types';
import { DeoptimizableEntity } from '../../DeoptimizableEntity';
import {
BROKEN_FLOW_NONE,
type HasEffectsContext,
type InclusionContext
} from '../../ExecutionContext';
import {
INTERACTION_CALLED,
NODE_INTERACTION_UNKNOWN_ACCESS,
NODE_INTERACTION_UNKNOWN_CALL,
NodeInteraction,
NodeInteractionCalled,
NodeInteractionWithThisArg
} from '../../NodeInteractions';
import ReturnValueScope from '../../scopes/ReturnValueScope';
import { type ObjectPath, PathTracker, UNKNOWN_PATH, UnknownKey } from '../../utils/PathTracker';
import BlockStatement from '../BlockStatement';
import * as NodeType from '../NodeType';
import RestElement from '../RestElement';
import type SpreadElement from '../SpreadElement';
import { type ExpressionEntity, LiteralValueOrUnknown, UNKNOWN_EXPRESSION } from './Expression';
import {
type ExpressionNode,
type GenericEsTreeNode,
type IncludeChildren,
NodeBase
} from './Node';
import { ObjectEntity } from './ObjectEntity';
import type { PatternNode } from './Pattern';
export default abstract class FunctionBase extends NodeBase {
declare async: boolean;
declare body: BlockStatement | ExpressionNode;
declare params: readonly PatternNode[];
declare preventChildBlockScope: true;
declare scope: ReturnValueScope;
protected objectEntity: ObjectEntity | null = null;
private deoptimizedReturn = false;
deoptimizePath(path: ObjectPath): void {
this.getObjectEntity().deoptimizePath(path);
if (path.length === 1 && path[0] === UnknownKey) {
// A reassignment of UNKNOWN_PATH is considered equivalent to having lost track
// which means the return expression needs to be reassigned
this.scope.getReturnExpression().deoptimizePath(UNKNOWN_PATH);
}
}
deoptimizeThisOnInteractionAtPath(
interaction: NodeInteractionWithThisArg,
path: ObjectPath,
recursionTracker: PathTracker
): void {
if (path.length > 0) {
this.getObjectEntity().deoptimizeThisOnInteractionAtPath(interaction, path, recursionTracker);
}
}
getLiteralValueAtPath(
path: ObjectPath,
recursionTracker: PathTracker,
origin: DeoptimizableEntity
): LiteralValueOrUnknown {
return this.getObjectEntity().getLiteralValueAtPath(path, recursionTracker, origin);
}
getReturnExpressionWhenCalledAtPath(
path: ObjectPath,
interaction: NodeInteractionCalled,
recursionTracker: PathTracker,
origin: DeoptimizableEntity
): ExpressionEntity {
if (path.length > 0) {
return this.getObjectEntity().getReturnExpressionWhenCalledAtPath(
path,
interaction,
recursionTracker,
origin
);
}
if (this.async) {
if (!this.deoptimizedReturn) {
this.deoptimizedReturn = true;
this.scope.getReturnExpression().deoptimizePath(UNKNOWN_PATH);
this.context.requestTreeshakingPass();
}
return UNKNOWN_EXPRESSION;
}
return this.scope.getReturnExpression();
}
hasEffectsOnInteractionAtPath(
path: ObjectPath,
interaction: NodeInteraction,
context: HasEffectsContext
): boolean {
if (path.length > 0 || interaction.type !== INTERACTION_CALLED) {
return this.getObjectEntity().hasEffectsOnInteractionAtPath(path, interaction, context);
}
if (this.async) {
const { propertyReadSideEffects } = this.context.options
.treeshake as NormalizedTreeshakingOptions;
const returnExpression = this.scope.getReturnExpression();
if (
returnExpression.hasEffectsOnInteractionAtPath(
['then'],
NODE_INTERACTION_UNKNOWN_CALL,
context
) ||
(propertyReadSideEffects &&
(propertyReadSideEffects === 'always' ||
returnExpression.hasEffectsOnInteractionAtPath(
['then'],
NODE_INTERACTION_UNKNOWN_ACCESS,
context
)))
) {
return true;
}
}
for (const param of this.params) {
if (param.hasEffects(context)) return true;
}
return false;
}
include(context: InclusionContext, includeChildrenRecursively: IncludeChildren): void {
if (!this.deoptimized) this.applyDeoptimizations();
this.included = true;
const { brokenFlow } = context;
context.brokenFlow = BROKEN_FLOW_NONE;
this.body.include(context, includeChildrenRecursively);
context.brokenFlow = brokenFlow;
}
includeCallArguments(
context: InclusionContext,
args: readonly (ExpressionEntity | SpreadElement)[]
): void {
this.scope.includeCallArguments(context, args);
}
initialise(): void {
this.scope.addParameterVariables(
this.params.map(param => param.declare('parameter', UNKNOWN_EXPRESSION)),
this.params[this.params.length - 1] instanceof RestElement
);
if (this.body instanceof BlockStatement) {
this.body.addImplicitReturnExpressionToScope();
} else {
this.scope.addReturnExpression(this.body);
}
}
parseNode(esTreeNode: GenericEsTreeNode): void {
if (esTreeNode.body.type === NodeType.BlockStatement) {
this.body = new BlockStatement(esTreeNode.body, this, this.scope.hoistedBodyVarScope);
}
super.parseNode(esTreeNode);
}
protected applyDeoptimizations() {}
protected abstract getObjectEntity(): ObjectEntity;
}
FunctionBase.prototype.preventChildBlockScope = true;