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CallExpression.ts
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CallExpression.ts
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import MagicString from 'magic-string';
import { NormalizedTreeshakingOptions } from '../../rollup/types';
import { BLANK } from '../../utils/blank';
import {
findFirstOccurrenceOutsideComment,
NodeRenderOptions,
RenderOptions
} from '../../utils/renderHelpers';
import { CallOptions } from '../CallOptions';
import { DeoptimizableEntity } from '../DeoptimizableEntity';
import { HasEffectsContext, InclusionContext } from '../ExecutionContext';
import {
EMPTY_PATH,
ObjectPath,
PathTracker,
SHARED_RECURSION_TRACKER,
UNKNOWN_PATH
} from '../utils/PathTracker';
import { LiteralValueOrUnknown, UnknownValue, UNKNOWN_EXPRESSION } from '../values';
import Identifier from './Identifier';
import MemberExpression from './MemberExpression';
import * as NodeType from './NodeType';
import { ExpressionEntity } from './shared/Expression';
import { ExpressionNode, IncludeChildren, INCLUDE_PARAMETERS, NodeBase } from './shared/Node';
import SpreadElement from './SpreadElement';
import Super from './Super';
export default class CallExpression extends NodeBase implements DeoptimizableEntity {
annotatedPure?: boolean;
arguments!: (ExpressionNode | SpreadElement)[];
callee!: ExpressionNode | Super;
optional!: boolean;
type!: NodeType.tCallExpression;
private callOptions!: CallOptions;
private expressionsToBeDeoptimized: DeoptimizableEntity[] = [];
private returnExpression: ExpressionEntity | null = null;
private wasPathDeoptmizedWhileOptimized = false;
bind() {
super.bind();
if (this.callee instanceof Identifier) {
const variable = this.scope.findVariable(this.callee.name);
if (variable.isNamespace) {
this.context.warn(
{
code: 'CANNOT_CALL_NAMESPACE',
message: `Cannot call a namespace ('${this.callee.name}')`
},
this.start
);
}
if (this.callee.name === 'eval') {
this.context.warn(
{
code: 'EVAL',
message: `Use of eval is strongly discouraged, as it poses security risks and may cause issues with minification`,
url: 'https://rollupjs.org/guide/en/#avoiding-eval'
},
this.start
);
}
}
// ensure the returnExpression is set for the tree-shaking passes
this.getReturnExpression(SHARED_RECURSION_TRACKER);
// This deoptimizes "this" for non-namespace calls until we have a better solution
if (this.callee instanceof MemberExpression && !this.callee.variable) {
this.callee.object.deoptimizePath(UNKNOWN_PATH);
}
for (const argument of this.arguments) {
// This will make sure all properties of parameters behave as "unknown"
argument.deoptimizePath(UNKNOWN_PATH);
}
}
deoptimizeCache() {
if (this.returnExpression !== UNKNOWN_EXPRESSION) {
this.returnExpression = null;
const returnExpression = this.getReturnExpression(SHARED_RECURSION_TRACKER);
const expressionsToBeDeoptimized = this.expressionsToBeDeoptimized;
if (returnExpression !== UNKNOWN_EXPRESSION) {
// We need to replace here because is possible new expressions are added
// while we are deoptimizing the old ones
this.expressionsToBeDeoptimized = [];
if (this.wasPathDeoptmizedWhileOptimized) {
returnExpression.deoptimizePath(UNKNOWN_PATH);
this.wasPathDeoptmizedWhileOptimized = false;
}
}
for (const expression of expressionsToBeDeoptimized) {
expression.deoptimizeCache();
}
}
}
deoptimizePath(path: ObjectPath) {
if (path.length === 0) return;
const trackedEntities = this.context.deoptimizationTracker.getEntities(path);
if (trackedEntities.has(this)) return;
trackedEntities.add(this);
const returnExpression = this.getReturnExpression(SHARED_RECURSION_TRACKER);
if (returnExpression !== UNKNOWN_EXPRESSION) {
this.wasPathDeoptmizedWhileOptimized = true;
returnExpression.deoptimizePath(path);
}
}
getLiteralValueAtPath(
path: ObjectPath,
recursionTracker: PathTracker,
origin: DeoptimizableEntity
): LiteralValueOrUnknown {
const returnExpression = this.getReturnExpression(recursionTracker);
if (returnExpression === UNKNOWN_EXPRESSION) {
return UnknownValue;
}
const trackedEntities = recursionTracker.getEntities(path);
if (trackedEntities.has(returnExpression)) {
return UnknownValue;
}
this.expressionsToBeDeoptimized.push(origin);
trackedEntities.add(returnExpression);
const value = returnExpression.getLiteralValueAtPath(path, recursionTracker, origin);
trackedEntities.delete(returnExpression);
return value;
}
getReturnExpressionWhenCalledAtPath(
path: ObjectPath,
recursionTracker: PathTracker,
origin: DeoptimizableEntity
) {
const returnExpression = this.getReturnExpression(recursionTracker);
if (this.returnExpression === UNKNOWN_EXPRESSION) {
return UNKNOWN_EXPRESSION;
}
const trackedEntities = recursionTracker.getEntities(path);
if (trackedEntities.has(returnExpression)) {
return UNKNOWN_EXPRESSION;
}
this.expressionsToBeDeoptimized.push(origin);
trackedEntities.add(returnExpression);
const value = returnExpression.getReturnExpressionWhenCalledAtPath(
path,
recursionTracker,
origin
);
trackedEntities.delete(returnExpression);
return value;
}
hasEffects(context: HasEffectsContext): boolean {
for (const argument of this.arguments) {
if (argument.hasEffects(context)) return true;
}
if (
(this.context.options.treeshake as NormalizedTreeshakingOptions).annotations &&
this.annotatedPure
)
return false;
return (
this.callee.hasEffects(context) ||
this.callee.hasEffectsWhenCalledAtPath(EMPTY_PATH, this.callOptions, context)
);
}
hasEffectsWhenAccessedAtPath(path: ObjectPath, context: HasEffectsContext): boolean {
if (path.length === 0) return false;
const trackedExpressions = context.accessed.getEntities(path);
if (trackedExpressions.has(this)) return false;
trackedExpressions.add(this);
return this.returnExpression!.hasEffectsWhenAccessedAtPath(path, context);
}
hasEffectsWhenAssignedAtPath(path: ObjectPath, context: HasEffectsContext): boolean {
if (path.length === 0) return true;
const trackedExpressions = context.assigned.getEntities(path);
if (trackedExpressions.has(this)) return false;
trackedExpressions.add(this);
return this.returnExpression!.hasEffectsWhenAssignedAtPath(path, context);
}
hasEffectsWhenCalledAtPath(
path: ObjectPath,
callOptions: CallOptions,
context: HasEffectsContext
): boolean {
const trackedExpressions = (callOptions.withNew
? context.instantiated
: context.called
).getEntities(path, callOptions);
if (trackedExpressions.has(this)) return false;
trackedExpressions.add(this);
return this.returnExpression!.hasEffectsWhenCalledAtPath(path, callOptions, context);
}
include(context: InclusionContext, includeChildrenRecursively: IncludeChildren) {
if (includeChildrenRecursively) {
super.include(context, includeChildrenRecursively);
if (
includeChildrenRecursively === INCLUDE_PARAMETERS &&
this.callee instanceof Identifier &&
this.callee.variable
) {
this.callee.variable.markCalledFromTryStatement();
}
} else {
this.included = true;
this.callee.include(context, false);
}
this.callee.includeCallArguments(context, this.arguments);
if (!this.returnExpression!.included) {
this.returnExpression!.include(context, false);
}
}
initialise() {
this.callOptions = {
args: this.arguments,
withNew: false
};
}
render(
code: MagicString,
options: RenderOptions,
{ renderedParentType }: NodeRenderOptions = BLANK
) {
this.callee.render(code, options);
if (this.arguments.length > 0) {
if (this.arguments[this.arguments.length - 1].included) {
for (const arg of this.arguments) {
arg.render(code, options);
}
} else {
let lastIncludedIndex = this.arguments.length - 2;
while (lastIncludedIndex >= 0 && !this.arguments[lastIncludedIndex].included) {
lastIncludedIndex--;
}
if (lastIncludedIndex >= 0) {
for (let index = 0; index <= lastIncludedIndex; index++) {
this.arguments[index].render(code, options);
}
code.remove(
findFirstOccurrenceOutsideComment(
code.original,
',',
this.arguments[lastIncludedIndex].end
),
this.end - 1
);
} else {
code.remove(
findFirstOccurrenceOutsideComment(code.original, '(', this.callee.end) + 1,
this.end - 1
);
}
}
}
if (
renderedParentType === NodeType.ExpressionStatement &&
this.callee.type === NodeType.FunctionExpression
) {
code.appendRight(this.start, '(');
code.prependLeft(this.end, ')');
}
}
private getReturnExpression(recursionTracker: PathTracker): ExpressionEntity {
if (this.returnExpression === null) {
this.returnExpression = UNKNOWN_EXPRESSION;
return (this.returnExpression = this.callee.getReturnExpressionWhenCalledAtPath(
EMPTY_PATH,
recursionTracker,
this
));
}
return this.returnExpression;
}
}