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resolver.ts
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3221 lines (3077 loc) · 109 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 {
DiagnosticEmitter,
DiagnosticCode
} from "./diagnostics";
import {
Program,
ElementKind,
OperatorKind,
Element,
Class,
ClassPrototype,
Function,
FunctionPrototype,
VariableLikeElement,
Property,
PropertyPrototype,
Field,
FieldPrototype,
Global,
TypeDefinition,
TypedElement,
FunctionTarget,
IndexSignature,
isTypedElement
} from "./program";
import {
Flow
} from "./flow";
import {
Range
} from "./tokenizer";
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
} from "./ast";
import {
Type,
Signature,
typesToString,
TypeKind,
TypeFlags
} from "./types";
import {
CommonFlags,
CommonNames
} from "./common";
import {
makeMap,
isPowerOf2
} from "./util";
import {
Token,
operatorTokenToString
} from "./tokenizer";
import {
BuiltinNames
} from "./builtins";
/** Indicates whether errors are reported or not. */
export 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;
/** 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 {
var nameNode = node.name;
var typeArgumentNodes = node.typeArguments;
var isSimpleType = !nameNode.next;
// Look up in contextual types if a simple type
if (isSimpleType) {
let simpleName = nameNode.identifier.text;
if (ctxTypes !== null && ctxTypes.has(simpleName)) {
let type = assert(ctxTypes.get(simpleName));
if (typeArgumentNodes !== null && typeArgumentNodes.length > 0) {
if (reportMode == ReportMode.REPORT) {
this.error(
DiagnosticCode.Type_0_is_not_generic,
node.range, type.toString()
);
}
}
if (node.isNullable) {
if (type.is(TypeFlags.REFERENCE)) return type.asNullable();
if (reportMode == ReportMode.REPORT) {
this.error(
DiagnosticCode.Basic_type_0_cannot_be_nullable,
node.range, type.toString()
);
}
}
return type;
}
}
// Look up in context
var element = this.resolveTypeName(nameNode, ctxElement, reportMode);
if (!element) return null;
// Use shadow type if present (i.e. namespace sharing a type)
var shadowType = element.shadowType;
if (shadowType) {
element = shadowType;
} else {
// Handle enums (become i32)
if (element.kind == ElementKind.ENUM) {
if (typeArgumentNodes !== null && 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.Basic_type_0_cannot_be_nullable,
node.range, element.name + "/i32"
);
}
}
return Type.i32;
}
// Handle classes
if (element.kind == ElementKind.CLASS_PROTOTYPE) {
let instance = this.resolveClassInclTypeArguments(
<ClassPrototype>element,
typeArgumentNodes,
ctxElement,
makeMap<string,Type>(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 !== null && 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.is(TypeFlags.REFERENCE)) {
if (reportMode == ReportMode.REPORT) {
this.error(
DiagnosticCode.Basic_type_0_cannot_be_nullable,
nameNode.range, nameNode.identifier.text
);
}
} else {
return type.asNullable();
}
}
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);
}
// Resolve normally
let typeParameterNodes = typeDefinition.typeParameterNodes;
let typeArguments: Type[] | null = null;
if (typeParameterNodes) {
typeArguments = this.resolveTypeArguments(
typeParameterNodes,
typeArgumentNodes,
ctxElement,
ctxTypes = makeMap(ctxTypes), // inherit
node,
reportMode
);
if (!typeArguments) return null;
} else if (typeArgumentNodes !== null && 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.is(TypeFlags.REFERENCE)) {
if (reportMode == ReportMode.REPORT) {
this.error(
DiagnosticCode.Basic_type_0_cannot_be_nullable,
nameNode.range, nameNode.identifier.text
);
}
} else {
return type.asNullable();
}
}
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 {
var explicitThisType = node.explicitThisType;
var thisType: Type | null = null;
if (explicitThisType) {
thisType = this.resolveType(
explicitThisType,
ctxElement,
ctxTypes,
reportMode
);
if (!thisType) return null;
}
var parameterNodes = node.parameters;
var numParameters = parameterNodes.length;
var parameterTypes = new Array<Type>(numParameters);
var parameterNames = new Array<string>(numParameters);
var requiredParameters = 0;
var 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;
parameterNames[i] = parameterNode.name.text;
}
var returnTypeNode = node.returnType;
var 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;
}
var signature = new Signature(this.program, parameterTypes, returnType, thisType);
signature.parameterNames = parameterNames;
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 {
var typeArgumentNodes = node.typeArguments;
if (!typeArgumentNodes || typeArgumentNodes.length != 1) {
if (reportMode == ReportMode.REPORT) {
let numTypeArguments = 0;
if (typeArgumentNodes) numTypeArguments = typeArgumentNodes.length;
this.error(
DiagnosticCode.Expected_0_type_arguments_but_got_1,
node.range, "1", numTypeArguments.toString()
);
}
return null;
}
var typeArgument = this.resolveType(typeArgumentNodes[0], 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 {
var typeArgumentNodes = node.typeArguments;
if (!typeArgumentNodes || typeArgumentNodes.length != 1) {
if (reportMode == ReportMode.REPORT) {
let numTypeArguments = 0;
if (typeArgumentNodes) numTypeArguments = typeArgumentNodes.length;
this.error(
DiagnosticCode.Expected_0_type_arguments_but_got_1,
node.range, "1", numTypeArguments.toString()
);
}
return null;
}
var typeArgument = this.resolveType(typeArgumentNodes[0], ctxElement, ctxTypes, reportMode);
if (!typeArgument) return null;
var classReference = typeArgument.classReference;
if (!classReference) {
if (reportMode == ReportMode.REPORT) {
this.error(
DiagnosticCode.Index_signature_is_missing_in_type_0,
typeArgumentNodes[0].range, typeArgument.toString()
);
}
return null;
}
var overload = classReference.lookupOverload(OperatorKind.INDEXED_GET);
if (overload) {
if (overload.is(CommonFlags.STATIC)) {
assert(overload.signature.parameterTypes.length == 2);
return overload.signature.parameterTypes[1];
} else {
assert(overload.signature.parameterTypes.length == 1);
return overload.signature.parameterTypes[0];
}
}
if (reportMode == ReportMode.REPORT) {
this.error(
DiagnosticCode.Index_signature_is_missing_in_type_0,
typeArgumentNodes[0].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 {
var typeArgumentNodes = node.typeArguments;
if (!typeArgumentNodes || typeArgumentNodes.length != 1) {
let numTypeArguments = 0;
if (typeArgumentNodes) numTypeArguments = typeArgumentNodes.length;
if (reportMode == ReportMode.REPORT) {
this.error(
DiagnosticCode.Expected_0_type_arguments_but_got_1,
node.range, "1", numTypeArguments.toString()
);
}
return null;
}
var typeArgument = this.resolveType(typeArgumentNodes[0], ctxElement, ctxTypes, reportMode);
if (!typeArgument) return null;
var classReference = typeArgument.classReference;
if (!classReference) {
if (reportMode == ReportMode.REPORT) {
this.error(
DiagnosticCode.Index_signature_is_missing_in_type_0,
typeArgumentNodes[0].range, typeArgument.toString()
);
}
return null;
}
var overload = classReference.lookupOverload(OperatorKind.INDEXED_GET);
if (overload) return overload.signature.returnType;
if (reportMode == ReportMode.REPORT) {
this.error(
DiagnosticCode.Index_signature_is_missing_in_type_0,
typeArgumentNodes[0].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 {
var typeArgumentNodes = node.typeArguments;
if (!typeArgumentNodes || typeArgumentNodes.length != 1) {
if (reportMode == ReportMode.REPORT) {
let numTypeArguments = 0;
if (typeArgumentNodes) numTypeArguments = typeArgumentNodes.length;
this.error(
DiagnosticCode.Expected_0_type_arguments_but_got_1,
node.range, "1", numTypeArguments.toString()
);
}
return null;
}
var typeArgument = this.resolveType(typeArgumentNodes[0], ctxElement, ctxTypes, reportMode);
if (!typeArgument) return null;
var signatureReference = typeArgument.signatureReference;
if (!signatureReference) {
if (reportMode == ReportMode.REPORT) {
this.error(
DiagnosticCode.Type_0_has_no_call_signatures,
typeArgumentNodes[0].range, typeArgument.toString()
);
}
return null;
}
return signatureReference.returnType;
}
/** 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 {
var element = ctxElement.lookup(node.identifier.text);
if (!element) {
if (reportMode == ReportMode.REPORT) {
this.error(
DiagnosticCode.Cannot_find_name_0,
node.range, node.identifier.text
);
}
return null;
}
var prev = node;
var next = node.next;
while (next) {
if (!(element = element.lookupInSelf(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`. */
ctxTypes: Map<string,Type> = makeMap<string,Type>(),
/** 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;
var maxParameterCount = 0;
for (let i = 0, k = typeParameters.length; i < k; ++i) {
if (!typeParameters[i].defaultType) ++minParameterCount;
++maxParameterCount;
}
var 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;
}
var typeArguments = new Array<Type>(maxParameterCount);
for (let i = 0; i < maxParameterCount; ++i) {
let type = i < argumentCount
? this.resolveType( // reports
typeArgumentNodes![i],
ctxElement,
ctxTypes,
reportMode
)
: this.resolveType( // reports
assert(typeParameters[i].defaultType),
ctxElement,
ctxTypes,
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 {
var 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.actualFunction,
makeMap(ctxFlow.contextualTypeArguments), // don't inherit
node,
reportMode
);
}
// infer generic call if type arguments have been omitted
if (prototype.is(CommonFlags.GENERIC)) {
let contextualTypeArguments = makeMap<string,Type>(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.arguments;
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) { // 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, ctxFlow, contextualTypeArguments, typeParameterNames);
}
}
// apply concrete types to the generic function signature
let resolvedTypeArguments = new Array<Type>(numTypeParameters);
for (let i = 0; i < numTypeParameters; ++i) {
let name = typeParameterNodes[i].name.text;
if (contextualTypeArguments.has(name)) {
let inferredType = assert(contextualTypeArguments.get(name));
if (inferredType != Type.auto) {
resolvedTypeArguments[i] = inferredType;
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,
makeMap<string,Type>(ctxFlow.contextualTypeArguments),
reportMode
);
}
// otherwise resolve the non-generic call as usual
return this.resolveFunction(prototype, null, makeMap<string,Type>(), reportMode);
}
/** Updates contextual types with a possibly encapsulated inferred type. */
private propagateInferredGenericTypes(
/** The inferred type node. */
node: TypeNode,
/** The inferred type. */
type: Type,
/** Contextual flow. */
ctxFlow: Flow,
/** 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 !== null && typeArgumentNodes.length > 0) { // foo<T>(bar: Array<T>)
let classReference = type.classReference;
if (classReference) {
let classPrototype = this.resolveTypeName(namedTypeNode.name, ctxFlow.actualFunction);
if (!classPrototype || classPrototype.kind != ElementKind.CLASS_PROTOTYPE) return;
if (classReference.prototype == <ClassPrototype>classPrototype) {
let typeArguments = classReference.typeArguments;
if (typeArguments !== null && typeArguments.length == typeArgumentNodes.length) {
for (let i = 0, k = typeArguments.length; i < k; ++i) {
this.propagateInferredGenericTypes(typeArgumentNodes[i], typeArguments[i], ctxFlow, 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;
if (parameterNodes !== null && parameterNodes.length > 0) {
let signatureReference = type.signatureReference;
if (signatureReference) {
let parameterTypes = signatureReference.parameterTypes;
let thisType = signatureReference.thisType;
if (parameterTypes.length == parameterNodes.length && !thisType == !functionTypeNode.explicitThisType) {
for (let i = 0, k = parameterTypes.length; i < k; ++i) {
this.propagateInferredGenericTypes(parameterNodes[i].type, parameterTypes[i], ctxFlow, ctxTypes, typeParameterNames);
}
this.propagateInferredGenericTypes(functionTypeNode.returnType, signatureReference.returnType, ctxFlow, ctxTypes, typeParameterNames);
if (thisType) this.propagateInferredGenericTypes(functionTypeNode.explicitThisType!, thisType, ctxFlow, ctxTypes, typeParameterNames);
return;
}
}
}
}
}
/** Gets the concrete type of an element. */
getTypeOfElement(element: Element): Type | null {
var kind = element.kind;
if (kind == ElementKind.GLOBAL) {
if (!this.ensureResolvedLazyGlobal(<Global>element, ReportMode.SWALLOW)) return null;
}
if (isTypedElement(kind)) {
let type = (<TypedElement>element).type;
assert(type != Type.void);
let classReference = type.classReference;
if (classReference) {
let wrappedType = classReference.wrappedType;
if (wrappedType) type = wrappedType;
}
return type;
}
if (kind == ElementKind.FUNCTION_TARGET) {
return (<FunctionTarget>element).type;
}
return null;
}
/** Gets the element of a concrete type. */
getElementOfType(type: Type): Element | null {
if (type.is(TypeFlags.REFERENCE)) {
let classReference = type.classReference;
if (classReference) return classReference;
let signatureReference = assert(type.signatureReference);
return signatureReference.asFunctionTarget(this.program);
} else if (type != Type.void) {
let wrapperClasses = this.program.wrapperClasses;
assert(wrapperClasses.has(type));
return assert(wrapperClasses.get(type));
}
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.actualFunction, reportMode
);
}
case NodeKind.THIS: {
return this.lookupThisExpression(
<ThisExpression>node,
ctxFlow, ctxType, reportMode
);
}
case NodeKind.SUPER: {
return this.lookupSuperExpression(
<SuperExpression>node,
ctxFlow, ctxType, reportMode
);
}
case NodeKind.INSTANCEOF: {
return this.lookupInstanceOfExpression(
<InstanceOfExpression>node,
ctxFlow, ctxType, reportMode
);
}
case NodeKind.LITERAL: {
return this.lookupLiteralExpression(
<LiteralExpression>node,
ctxFlow, ctxType, reportMode
);
}
case NodeKind.NEW: {