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3669 lines (3512 loc) · 126 KB
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/**
* @fileoverview Resolve infrastructure to obtain types and elements.
*
* Similar to the compiler making instructions of expressions, the resolver
* obtains metadata of expressions. As such, for each `compileX` method in
* the compiler there is one `lookupX` method in the resolver returning the
* respective IR element, respectively one `resolveX` method returning the
* respective type of an expression. It is also able to make new elements,
* like instances of classes given its concrete type arguments.
*
* @license Apache-2.0
*/
import {
Range,
DiagnosticEmitter,
DiagnosticCode
} from "./diagnostics";
import {
Program,
ElementKind,
OperatorKind,
Element,
Class,
ClassPrototype,
Interface,
Function,
FunctionPrototype,
VariableLikeElement,
Property,
PropertyPrototype,
Global,
TypeDefinition,
TypedElement,
IndexSignature,
isTypedElement,
InterfacePrototype,
DeclaredElement
} from "./program";
import {
Flow
} from "./flow";
import {
FunctionTypeNode,
ParameterKind,
TypeNode,
NodeKind,
NamedTypeNode,
TypeName,
TypeParameterNode,
Node,
IdentifierExpression,
CallExpression,
ElementAccessExpression,
PropertyAccessExpression,
LiteralExpression,
LiteralKind,
ParenthesizedExpression,
AssertionExpression,
Expression,
IntegerLiteralExpression,
UnaryPrefixExpression,
UnaryPostfixExpression,
AssertionKind,
BinaryExpression,
ThisExpression,
SuperExpression,
CommaExpression,
InstanceOfExpression,
TernaryExpression,
isTypeOmitted,
FunctionExpression,
NewExpression,
ArrayLiteralExpression,
ArrowKind,
ExpressionStatement
} from "./ast";
import {
Type,
Signature,
typesToString,
TypeKind
} from "./types";
import {
CommonFlags,
CommonNames
} from "./common";
import {
cloneMap,
isPowerOf2
} from "./util";
import {
Token,
operatorTokenToString
} from "./tokenizer";
import {
BuiltinNames
} from "./builtins";
/** Indicates whether errors are reported or not. */
export const enum ReportMode {
/** Report errors. */
Report,
/** Swallow errors. */
Swallow
}
/** Provides tools to resolve types and expressions. */
export class Resolver extends DiagnosticEmitter {
/** The program this resolver belongs to. */
program: Program;
/** Target expression of the previously resolved property or element access. */
currentThisExpression: Expression | null = null;
/** Element expression of the previously resolved element access. */
currentElementExpression : Expression | null = null;
/** Whether a new override has been discovered. */
discoveredOverride: bool = false;
/** Constructs the resolver for the specified program. */
constructor(
/** The program to construct a resolver for. */
program: Program
) {
super(program.diagnostics);
this.program = program;
}
// ====================================================== Types ======================================================
/** Resolves a {@link TypeNode} to a concrete {@link Type}. */
resolveType(
/** The type to resolve. */
node: TypeNode,
/** Contextual element. */
ctxElement: Element,
/** Contextual types, i.e. `T`. */
ctxTypes: Map<string,Type> | null = null,
/** How to proceed with eventual diagnostics. */
reportMode: ReportMode = ReportMode.Report
): Type | null {
switch (node.kind) {
case NodeKind.NamedType: {
return this.resolveNamedType(
<NamedTypeNode>node,
ctxElement,
ctxTypes,
reportMode
);
}
case NodeKind.FunctionType: {
return this.resolveFunctionType(
<FunctionTypeNode>node,
ctxElement,
ctxTypes,
reportMode
);
}
default: assert(false);
}
return null;
}
/** Resolves a {@link NamedTypeNode} to a concrete {@link Type}. */
private resolveNamedType(
/** The type to resolve. */
node: NamedTypeNode,
/** Contextual element. */
ctxElement: Element,
/** Contextual types, i.e. `T`. */
ctxTypes: Map<string,Type> | null = null,
/** How to proceed with eventual diagnostics. */
reportMode: ReportMode = ReportMode.Report
): Type | null {
let nameNode = node.name;
let typeArgumentNodes = node.typeArguments;
let isSimpleType = !nameNode.next;
// Look up in contextual types if a simple type
if (isSimpleType) {
let simpleName = nameNode.identifier.text;
if (ctxTypes && ctxTypes.has(simpleName)) {
let type = assert(ctxTypes.get(simpleName));
if (typeArgumentNodes && typeArgumentNodes.length > 0) {
if (reportMode == ReportMode.Report) {
this.error(
DiagnosticCode.Type_0_is_not_generic,
node.range, type.toString()
);
}
}
if (node.isNullable) {
if (type.isInternalReference) return type.asNullable();
if (reportMode == ReportMode.Report) {
this.error(
DiagnosticCode.Type_0_cannot_be_nullable,
node.range, type.toString()
);
}
}
return type;
}
}
// Look up in context
let element = this.resolveTypeName(nameNode, ctxElement, reportMode);
if (!element) return null;
// Use shadow type if present (i.e. namespace sharing a type)
let shadowType = element.shadowType;
if (shadowType) {
element = shadowType;
} else {
// Handle enums (become i32)
if (element.kind == ElementKind.Enum) {
if (typeArgumentNodes && typeArgumentNodes.length > 0) {
if (reportMode == ReportMode.Report) {
this.error(
DiagnosticCode.Type_0_is_not_generic,
node.range, element.internalName
);
}
}
if (node.isNullable) {
if (reportMode == ReportMode.Report) {
this.error(
DiagnosticCode.Type_0_cannot_be_nullable,
node.range, `${element.name}/i32`
);
}
}
return Type.i32;
}
// Handle classes and interfaces
if (
element.kind == ElementKind.ClassPrototype ||
element.kind == ElementKind.InterfacePrototype
) {
let instance = this.resolveClassInclTypeArguments(
<ClassPrototype>element,
typeArgumentNodes,
ctxElement,
cloneMap(ctxTypes), // don't inherit
node,
reportMode
);
if (!instance) return null;
return node.isNullable ? instance.type.asNullable() : instance.type;
}
}
// Handle type definitions
if (element.kind == ElementKind.TypeDefinition) {
let typeDefinition = <TypeDefinition>element;
// Shortcut already resolved (mostly builtins)
if (element.is(CommonFlags.Resolved)) {
if (typeArgumentNodes && typeArgumentNodes.length > 0) {
if (reportMode == ReportMode.Report) {
this.error(
DiagnosticCode.Type_0_is_not_generic,
node.range, element.internalName
);
}
}
let type = typeDefinition.type;
if (node.isNullable) {
if (type.isInternalReference) return type.asNullable();
if (reportMode == ReportMode.Report) {
this.error(
DiagnosticCode.Type_0_cannot_be_nullable,
nameNode.range, nameNode.identifier.text
);
}
}
return type;
}
// Handle special built-in types
if (isSimpleType) {
let text = nameNode.identifier.text;
if (text == CommonNames.native) return this.resolveBuiltinNativeType(node, ctxElement, ctxTypes, reportMode);
if (text == CommonNames.indexof) return this.resolveBuiltinIndexofType(node, ctxElement, ctxTypes, reportMode);
if (text == CommonNames.valueof) return this.resolveBuiltinValueofType(node, ctxElement, ctxTypes, reportMode);
if (text == CommonNames.returnof) return this.resolveBuiltinReturnTypeType(node, ctxElement, ctxTypes, reportMode);
if (text == CommonNames.nonnull) return this.resolveBuiltinNotNullableType(node, ctxElement, ctxTypes, reportMode);
}
// Resolve normally
let typeParameterNodes = typeDefinition.typeParameterNodes;
let typeArguments: Type[] | null = null;
if (typeParameterNodes) {
typeArguments = this.resolveTypeArguments(
typeParameterNodes,
typeArgumentNodes,
ctxElement,
ctxTypes = cloneMap(ctxTypes), // update
node,
reportMode
);
if (!typeArguments) return null;
} else if (typeArgumentNodes && typeArgumentNodes.length > 0) {
this.error(
DiagnosticCode.Type_0_is_not_generic,
node.range, nameNode.identifier.text
);
}
let type = this.resolveType(
typeDefinition.typeNode,
element,
ctxTypes,
reportMode
);
if (!type) return null;
if (node.isNullable) {
if (type.isInternalReference) return type.asNullable();
if (reportMode == ReportMode.Report) {
this.error(
DiagnosticCode.Type_0_cannot_be_nullable,
nameNode.range, nameNode.identifier.text
);
}
}
return type;
}
if (reportMode == ReportMode.Report) {
this.error(
DiagnosticCode.Cannot_find_name_0,
nameNode.range, nameNode.identifier.text
);
}
return null;
}
/** Resolves a {@link FunctionTypeNode} to a concrete {@link Type}. */
private resolveFunctionType(
/** The type to resolve. */
node: FunctionTypeNode,
/** Contextual element. */
ctxElement: Element,
/** Contextual types, i.e. `T`. */
ctxTypes: Map<string,Type> | null = null,
/** How to proceed with eventual diagnostics. */
reportMode: ReportMode = ReportMode.Report
): Type | null {
let explicitThisType = node.explicitThisType;
let thisType: Type | null = null;
if (explicitThisType) {
thisType = this.resolveType(
explicitThisType,
ctxElement,
ctxTypes,
reportMode
);
if (!thisType) return null;
}
let parameterNodes = node.parameters;
let numParameters = parameterNodes.length;
let parameterTypes = new Array<Type>(numParameters);
let requiredParameters = 0;
let hasRest = false;
for (let i = 0; i < numParameters; ++i) {
let parameterNode = parameterNodes[i];
switch (parameterNode.parameterKind) {
case ParameterKind.Default: {
requiredParameters = i + 1;
break;
}
case ParameterKind.Rest: {
assert(i == numParameters);
hasRest = true;
break;
}
}
let parameterTypeNode = parameterNode.type;
if (isTypeOmitted(parameterTypeNode)) {
if (reportMode == ReportMode.Report) {
this.error(
DiagnosticCode.Type_expected,
parameterTypeNode.range
);
}
return null;
}
let parameterType = this.resolveType(
parameterTypeNode,
ctxElement,
ctxTypes,
reportMode
);
if (!parameterType) return null;
parameterTypes[i] = parameterType;
}
let returnTypeNode = node.returnType;
let returnType: Type | null;
if (isTypeOmitted(returnTypeNode)) {
if (reportMode == ReportMode.Report) {
this.error(
DiagnosticCode.Type_expected,
returnTypeNode.range
);
}
returnType = Type.void;
} else {
returnType = this.resolveType(
returnTypeNode,
ctxElement,
ctxTypes,
reportMode
);
if (!returnType) return null;
}
let signature = new Signature(this.program, parameterTypes, returnType, thisType);
signature.requiredParameters = requiredParameters;
signature.hasRest = hasRest;
return node.isNullable ? signature.type.asNullable() : signature.type;
}
private resolveBuiltinNativeType(
/** The type to resolve. */
node: NamedTypeNode,
/** Contextual element. */
ctxElement: Element,
/** Contextual types, i.e. `T`. */
ctxTypes: Map<string,Type> | null = null,
/** How to proceed with eventual diagnostics. */
reportMode: ReportMode = ReportMode.Report
): Type | null {
const typeArgumentNode = this.ensureOneTypeArgument(node, reportMode);
if (!typeArgumentNode) return null;
let typeArgument = this.resolveType(typeArgumentNode, ctxElement, ctxTypes, reportMode);
if (!typeArgument) return null;
switch (typeArgument.kind) {
case TypeKind.I8:
case TypeKind.I16:
case TypeKind.I32: return Type.i32;
case TypeKind.Isize: if (!this.program.options.isWasm64) return Type.i32;
case TypeKind.I64: return Type.i64;
case TypeKind.U8:
case TypeKind.U16:
case TypeKind.U32:
case TypeKind.Bool: return Type.u32;
case TypeKind.Usize: if (!this.program.options.isWasm64) return Type.u32;
case TypeKind.U64: return Type.u64;
case TypeKind.F32: return Type.f32;
case TypeKind.F64: return Type.f64;
case TypeKind.V128: return Type.v128;
case TypeKind.Void: return Type.void;
default: assert(false);
}
return null;
}
private resolveBuiltinIndexofType(
/** The type to resolve. */
node: NamedTypeNode,
/** Contextual element. */
ctxElement: Element,
/** Contextual types, i.e. `T`. */
ctxTypes: Map<string,Type> | null = null,
/** How to proceed with eventual diagnostics. */
reportMode: ReportMode = ReportMode.Report
): Type | null {
const typeArgumentNode = this.ensureOneTypeArgument(node, reportMode);
if (!typeArgumentNode) return null;
let typeArgument = this.resolveType(typeArgumentNode, ctxElement, ctxTypes, reportMode);
if (!typeArgument) return null;
let classReference = typeArgument.classReference;
if (!classReference) {
if (reportMode == ReportMode.Report) {
this.error(
DiagnosticCode.Index_signature_is_missing_in_type_0,
typeArgumentNode.range, typeArgument.toString()
);
}
return null;
}
let overload = classReference.lookupOverload(OperatorKind.IndexedGet);
if (overload) {
let parameterTypes = overload.signature.parameterTypes;
if (overload.is(CommonFlags.Static)) {
assert(parameterTypes.length == 2);
return parameterTypes[1];
} else {
assert(parameterTypes.length == 1);
return parameterTypes[0];
}
}
if (reportMode == ReportMode.Report) {
this.error(
DiagnosticCode.Index_signature_is_missing_in_type_0,
typeArgumentNode.range, typeArgument.toString()
);
}
return null;
}
private resolveBuiltinValueofType(
/** The type to resolve. */
node: NamedTypeNode,
/** Contextual element. */
ctxElement: Element,
/** Contextual types, i.e. `T`. */
ctxTypes: Map<string,Type> | null = null,
/** How to proceed with eventual diagnostics. */
reportMode: ReportMode = ReportMode.Report
): Type | null {
const typeArgumentNode = this.ensureOneTypeArgument(node, reportMode);
if (!typeArgumentNode) return null;
let typeArgument = this.resolveType(typeArgumentNode, ctxElement, ctxTypes, reportMode);
if (!typeArgument) return null;
let classReference = typeArgument.getClassOrWrapper(this.program);
if (classReference) {
let overload = classReference.lookupOverload(OperatorKind.IndexedGet);
if (overload) return overload.signature.returnType;
}
if (reportMode == ReportMode.Report) {
this.error(
DiagnosticCode.Index_signature_is_missing_in_type_0,
typeArgumentNode.range, typeArgument.toString()
);
}
return null;
}
private resolveBuiltinReturnTypeType(
/** The type to resolve. */
node: NamedTypeNode,
/** Contextual element. */
ctxElement: Element,
/** Contextual types, i.e. `T`. */
ctxTypes: Map<string,Type> | null = null,
/** How to proceed with eventualy diagnostics. */
reportMode: ReportMode = ReportMode.Report
): Type | null {
const typeArgumentNode = this.ensureOneTypeArgument(node, reportMode);
if (!typeArgumentNode) return null;
let typeArgument = this.resolveType(typeArgumentNode, ctxElement, ctxTypes, reportMode);
if (!typeArgument) return null;
let signatureReference = typeArgument.getSignature();
if (signatureReference) return signatureReference.returnType;
if (reportMode == ReportMode.Report) {
this.error(
DiagnosticCode.Type_0_has_no_call_signatures,
typeArgumentNode.range, typeArgument.toString()
);
}
return null;
}
private resolveBuiltinNotNullableType(
/** The type to resolve. */
node: NamedTypeNode,
/** Contextual element. */
ctxElement: Element,
/** Contextual types, i.e. `T`. */
ctxTypes: Map<string,Type> | null = null,
/** How to proceed with eventual diagnostics. */
reportMode: ReportMode = ReportMode.Report
): Type | null {
const typeArgumentNode = this.ensureOneTypeArgument(node, reportMode);
if (!typeArgumentNode) return null;
let typeArgument = this.resolveType(typeArgumentNode, ctxElement, ctxTypes, reportMode);
if (!typeArgument) return null;
if (!typeArgument.isNullableReference) return typeArgument;
return typeArgument.nonNullableType;
}
/** Resolves a type name to the program element it refers to. */
resolveTypeName(
/** The type name to resolve. */
node: TypeName,
/** Contextual element. */
ctxElement: Element,
/** How to proceed with eventual diagnostics. */
reportMode: ReportMode = ReportMode.Report
): Element | null {
let element = ctxElement.lookup(node.identifier.text, true);
if (!element) {
if (reportMode == ReportMode.Report) {
this.error(
DiagnosticCode.Cannot_find_name_0,
node.range, node.identifier.text
);
}
return null;
}
let prev = node;
let next = node.next;
while (next) {
if (!(element = element.getMember(next.identifier.text))) {
if (reportMode == ReportMode.Report) {
this.error(
DiagnosticCode.Property_0_does_not_exist_on_type_1,
next.range, next.identifier.text, prev.identifier.text
);
}
return null;
}
prev = next;
next = next.next;
}
return element;
}
/** Resolves an array of type arguments to concrete types. */
resolveTypeArguments(
/** Type parameter nodes present. */
typeParameters: TypeParameterNode[],
/** Type argument nodes provided. */
typeArgumentNodes: TypeNode[] | null,
/** Contextual element. */
ctxElement: Element,
/** Contextual types, i.e. `T`. Updated in place with the new set of contextual types. */
ctxTypes: Map<string,Type> = new Map(),
/** Alternative report node in case of empty type arguments. */
alternativeReportNode: Node | null = null,
/** How to proceed with eventual diagnostics. */
reportMode: ReportMode = ReportMode.Report
): Type[] | null {
var
minParameterCount = 0,
maxParameterCount = 0;
for (let i = 0, k = typeParameters.length; i < k; ++i) {
if (!typeParameters[i].defaultType) ++minParameterCount;
++maxParameterCount;
}
let argumentCount = typeArgumentNodes ? typeArgumentNodes.length : 0;
if (argumentCount < minParameterCount || argumentCount > maxParameterCount) {
if (reportMode == ReportMode.Report) {
this.error(
DiagnosticCode.Expected_0_type_arguments_but_got_1,
argumentCount
? Range.join(
typeArgumentNodes![0].range,
typeArgumentNodes![argumentCount - 1].range
)
: alternativeReportNode!.range,
(argumentCount < minParameterCount ? minParameterCount : maxParameterCount).toString(),
argumentCount.toString()
);
}
return null;
}
let typeArguments = new Array<Type>(maxParameterCount);
let oldCtxTypes = cloneMap(ctxTypes);
ctxTypes.clear();
for (let i = 0; i < maxParameterCount; ++i) {
let type = i < argumentCount
? this.resolveType( // reports
typeArgumentNodes![i],
ctxElement,
oldCtxTypes, // update
reportMode
)
: this.resolveType( // reports
assert(typeParameters[i].defaultType),
ctxElement,
cloneMap(ctxTypes), // don't update
reportMode
);
if (!type) return null;
// TODO: check extendsType
ctxTypes.set(typeParameters[i].name.text, type);
typeArguments[i] = type;
}
return typeArguments;
}
/** Resolves respectively infers the concrete instance of a function by call context. */
maybeInferCall(
node: CallExpression,
prototype: FunctionPrototype,
ctxFlow: Flow,
reportMode: ReportMode = ReportMode.Report
): Function | null {
let typeArguments = node.typeArguments;
// resolve generic call if type arguments have been provided
if (typeArguments) {
if (!prototype.is(CommonFlags.Generic)) {
if (reportMode == ReportMode.Report) {
this.error(
DiagnosticCode.Type_0_is_not_generic,
node.expression.range, prototype.internalName
);
}
return null;
}
return this.resolveFunctionInclTypeArguments(
prototype,
typeArguments,
ctxFlow.sourceFunction,
cloneMap(ctxFlow.contextualTypeArguments), // don't inherit
node,
reportMode
);
}
// infer generic call if type arguments have been omitted
if (prototype.is(CommonFlags.Generic)) {
let contextualTypeArguments = cloneMap(ctxFlow.contextualTypeArguments);
// fill up contextual types with auto for each generic component
let typeParameterNodes = assert(prototype.typeParameterNodes);
let numTypeParameters = typeParameterNodes.length;
let typeParameterNames = new Set<string>();
for (let i = 0; i < numTypeParameters; ++i) {
let name = typeParameterNodes[i].name.text;
contextualTypeArguments.set(name, Type.auto);
typeParameterNames.add(name);
}
let parameterNodes = prototype.functionTypeNode.parameters;
let numParameters = parameterNodes.length;
let argumentNodes = node.args;
let numArguments = argumentNodes.length;
// infer types with generic components while updating contextual types
for (let i = 0; i < numParameters; ++i) {
let argumentExpression = i < numArguments
? argumentNodes[i]
: parameterNodes[i].initializer;
if (!argumentExpression) {
// optional but not have initializer should be handled in the other place
if (parameterNodes[i].parameterKind == ParameterKind.Optional) {
continue;
}
// missing initializer -> too few arguments
if (reportMode == ReportMode.Report) {
this.error(
DiagnosticCode.Expected_0_arguments_but_got_1,
node.range, numParameters.toString(), numArguments.toString()
);
}
return null;
}
let typeNode = parameterNodes[i].type;
if (typeNode.hasGenericComponent(typeParameterNodes)) {
let type = this.resolveExpression(argumentExpression, ctxFlow, Type.auto, ReportMode.Swallow);
if (type) {
this.propagateInferredGenericTypes(
typeNode,
type,
prototype,
contextualTypeArguments,
typeParameterNames
);
}
}
}
// apply concrete types to the generic function signature
let resolvedTypeArguments = new Array<Type>(numTypeParameters);
for (let i = 0; i < numTypeParameters; ++i) {
let typeParameterNode = typeParameterNodes[i];
let name = typeParameterNode.name.text;
if (contextualTypeArguments.has(name)) {
let inferredType = assert(contextualTypeArguments.get(name));
if (inferredType != Type.auto) {
resolvedTypeArguments[i] = inferredType;
continue;
}
let defaultType = typeParameterNode.defaultType;
if (defaultType) {
// Default parameters are resolved in context of the called function, not the calling function
let parent = prototype.parent;
let defaultTypeContextualTypeArguments: Map<string, Type> | null = null;
if (parent.kind == ElementKind.Class) {
defaultTypeContextualTypeArguments = (<Class>parent).contextualTypeArguments;
} else if (parent.kind == ElementKind.Function) {
defaultTypeContextualTypeArguments = (<Function>parent).contextualTypeArguments;
}
let resolvedDefaultType = this.resolveType(
defaultType,
prototype,
defaultTypeContextualTypeArguments,
reportMode
);
if (!resolvedDefaultType) return null;
resolvedTypeArguments[i] = resolvedDefaultType;
continue;
}
}
// unused template, e.g. `function test<T>(): void {...}` called as `test()`
// invalid because the type is effectively unknown inside the function body
if (reportMode == ReportMode.Report) {
this.error(
DiagnosticCode.Type_argument_expected,
node.expression.range.atEnd
);
}
return null;
}
return this.resolveFunction(
prototype,
resolvedTypeArguments,
cloneMap(ctxFlow.contextualTypeArguments),
reportMode
);
}
// otherwise resolve the non-generic call as usual
return this.resolveFunction(prototype, null, new Map(), reportMode);
}
/** Updates contextual types with a possibly encapsulated inferred type. */
private propagateInferredGenericTypes(
/** The inferred type node. */
node: TypeNode,
/** The inferred type. */
type: Type,
/** Contextual element. */
ctxElement: Element,
/** Contextual types, i.e. `T`, with unknown types initialized to `auto`. */
ctxTypes: Map<string,Type>,
/** The names of the type parameters being inferred. */
typeParameterNames: Set<string>
): void {
if (node.kind == NodeKind.NamedType) {
let namedTypeNode = <NamedTypeNode>node;
let typeArgumentNodes = namedTypeNode.typeArguments;
if (typeArgumentNodes && typeArgumentNodes.length > 0) { // foo<T>(bar: Array<T>)
let classReference = type.classReference;
if (classReference) {
let classPrototype = this.resolveTypeName(namedTypeNode.name, ctxElement);
if (!classPrototype || classPrototype.kind != ElementKind.ClassPrototype) return;
if (classReference.prototype == <ClassPrototype>classPrototype) {
let typeArguments = classReference.typeArguments;
if (typeArguments && typeArguments.length == typeArgumentNodes.length) {
for (let i = 0, k = typeArguments.length; i < k; ++i) {
this.propagateInferredGenericTypes(
typeArgumentNodes[i],
typeArguments[i],
ctxElement,
ctxTypes,
typeParameterNames
);
}
return;
}
}
}
} else { // foo<T>(bar: T)
let name = namedTypeNode.name.identifier.text;
if (ctxTypes.has(name)) {
let currentType = assert(ctxTypes.get(name));
if (
currentType == Type.auto ||
(typeParameterNames.has(name) && currentType.isAssignableTo(type))
) ctxTypes.set(name, type);
}
}
} else if (node.kind == NodeKind.FunctionType) { // foo<T>(bar: (baz: T) => i32))
let functionTypeNode = <FunctionTypeNode>node;
let parameterNodes = functionTypeNode.parameters;
let signatureReference = type.signatureReference;
if (signatureReference) {
let parameterTypes = signatureReference.parameterTypes;
for (let i = 0, k = min(parameterTypes.length, parameterNodes.length) ; i < k; ++i) {
this.propagateInferredGenericTypes(
parameterNodes[i].type,
parameterTypes[i],
ctxElement,
ctxTypes,
typeParameterNames
);
}
let returnType = signatureReference.returnType;
if (returnType != Type.void) {
this.propagateInferredGenericTypes(
functionTypeNode.returnType,
returnType,
ctxElement,
ctxTypes,
typeParameterNames
);
}
let thisType = signatureReference.thisType;
let explicitThisType = functionTypeNode.explicitThisType;
if (thisType && explicitThisType) {
this.propagateInferredGenericTypes(
explicitThisType,
thisType,
ctxElement,
ctxTypes,
typeParameterNames
);
}
return;
}
}
}
/** Gets the concrete type of an element. */
getTypeOfElement(element: Element): Type | null {
let kind = element.kind;
if (kind == ElementKind.Global) {
if (!this.ensureResolvedLazyGlobal(<Global>element, ReportMode.Swallow)) return null;
}
if (isTypedElement(kind)) {
let type = (<TypedElement>element).type;
let classReference = type.getClassOrWrapper(this.program);
if (classReference) {
let wrappedType = classReference.wrappedType;
if (wrappedType) type = wrappedType;
}
return type;
}
return null;
}
/** Gets the element of a concrete type. */
getElementOfType(type: Type): Element | null {
let classReference = type.getClassOrWrapper(this.program);
if (classReference) return classReference;
return null;
}
// =================================================== Expressions ===================================================
/** Looks up the program element the specified expression refers to. */
lookupExpression(
/** The expression to look up. */
node: Expression,
/** Contextual flow. */
ctxFlow: Flow,
/** Contextual type. */
ctxType: Type = Type.auto,
/** How to proceed with eventual diagnostics. */
reportMode: ReportMode = ReportMode.Report
): Element | null {
while (node.kind == NodeKind.Parenthesized) { // skip
node = (<ParenthesizedExpression>node).expression;
}
switch (node.kind) {
case NodeKind.Assertion: {
return this.lookupAssertionExpression(
<AssertionExpression>node,
ctxFlow, ctxType, reportMode
);
}
case NodeKind.Binary: {
return this.lookupBinaryExpression(
<BinaryExpression>node,
ctxFlow, ctxType, reportMode
);
}
case NodeKind.Call: {
return this.lookupCallExpression(
<CallExpression>node,
ctxFlow, ctxType, reportMode
);
}
case NodeKind.Comma: {
return this.lookupCommaExpression(
<CommaExpression>node,
ctxFlow, ctxType, reportMode
);
}
case NodeKind.ElementAccess: {
return this.lookupElementAccessExpression(
<ElementAccessExpression>node,
ctxFlow, ctxType, reportMode
);
}
case NodeKind.Function: {
return this.lookupFunctionExpression(
<FunctionExpression>node,
ctxFlow, ctxType, reportMode
);
}
case NodeKind.Identifier:
case NodeKind.False:
case NodeKind.Null:
case NodeKind.True: {
return this.lookupIdentifierExpression(
<IdentifierExpression>node,
ctxFlow, ctxFlow.sourceFunction, reportMode
);
}
case NodeKind.This: {
return this.lookupThisExpression(
<ThisExpression>node,
ctxFlow, ctxType, reportMode
);
}
case NodeKind.Super: {