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resolver.ts
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1437 lines (1360 loc) · 48.7 KB
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/**
* Resolve infrastructure to obtain types and elements.
* @module resolver
*//***/
import {
DiagnosticEmitter,
DiagnosticCode
} from "./diagnostics";
import {
Program,
ElementKind,
OperatorKind,
FlowFlags,
Element,
Class,
ClassPrototype,
Function,
FunctionTarget,
FunctionPrototype,
VariableLikeElement,
Property,
DecoratorFlags,
FieldPrototype,
Field,
Global,
Flow
} from "./program";
import {
SignatureNode,
ParameterKind,
CommonTypeNode,
NodeKind,
TypeNode,
TypeParameterNode,
Node,
Range,
IdentifierExpression,
CallExpression,
ElementAccessExpression,
PropertyAccessExpression,
LiteralExpression,
LiteralKind,
ParenthesizedExpression,
AssertionExpression,
Expression,
IntegerLiteralExpression,
UnaryPrefixExpression,
UnaryPostfixExpression,
AssertionKind
} from "./ast";
import {
Type,
Signature,
typesToString,
TypeKind,
TypeFlags
} from "./types";
import {
PATH_DELIMITER,
INSTANCE_DELIMITER,
CommonFlags
} from "./common";
import {
makeMap
} from "./util";
import {
Token
} from "./tokenizer";
/** 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(program: Program) {
super(program.diagnostics);
this.program = program;
}
/** Resolves a {@link CommonTypeNode} to a concrete {@link Type}. */
resolveType(
node: CommonTypeNode,
contextualTypeArguments: Map<string,Type> | null = null,
reportMode = ReportMode.REPORT
): Type | null {
// handle signatures specifically
if (node.kind == NodeKind.SIGNATURE) {
let signature = this.resolveSignature(<SignatureNode>node, contextualTypeArguments, reportMode);
if (!signature) return null;
return node.isNullable ? signature.type.asNullable() : signature.type;
}
// now dealing with TypeNode
assert(node.kind == NodeKind.TYPE);
var typeNode = <TypeNode>node;
var simpleName = typeNode.name.text;
var globalName = simpleName;
var localName = typeNode.range.source.internalPath + PATH_DELIMITER + simpleName; // TODO cache
// check file-global / program-global enum or class
{
let elementsLookup = this.program.elementsLookup;
let element: Element | null;
if (
(element = elementsLookup.get(localName)) || // file-global
(element = elementsLookup.get(globalName)) // program-global
) {
switch (element.kind) {
case ElementKind.ENUM: {
if (typeNode.typeArguments !== null && typeNode.typeArguments.length) {
if (reportMode == ReportMode.REPORT) {
this.error(
DiagnosticCode.Type_0_is_not_generic,
node.range, element.internalName
);
}
return null;
}
return Type.i32;
}
case ElementKind.CLASS_PROTOTYPE: {
let instance = this.resolveClassInclTypeArguments(
<ClassPrototype>element,
typeNode.typeArguments,
makeMap<string,Type>(contextualTypeArguments),
node
); // reports
if (!instance) return null;
return node.isNullable ? instance.type.asNullable() : instance.type;
}
}
}
}
// check (global) type alias
{
let alias = this.program.typeAliases.get(simpleName);
if (alias) return this.resolveType(alias.type, contextualTypeArguments, reportMode);
}
// resolve parameters
var typeArgumentNodes = typeNode.typeArguments;
var typeArguments: Type[] | null = null;
if (typeArgumentNodes) {
let numTypeArguments = typeArgumentNodes.length;
typeArguments = new Array<Type>(numTypeArguments);
for (let i = 0; i < numTypeArguments; ++i) {
let paramType = this.resolveType( // reports
typeArgumentNodes[i],
contextualTypeArguments,
reportMode
);
if (!paramType) return null;
typeArguments[i] = paramType;
}
if (numTypeArguments) { // can't be a placeholder if it has parameters
let instanceKey = typesToString(typeArguments);
if (instanceKey.length) {
localName += "<" + instanceKey + ">";
globalName += "<" + instanceKey + ">";
}
} else if (contextualTypeArguments) {
let placeholderType = contextualTypeArguments.get(globalName);
if (placeholderType) return placeholderType;
}
}
// check file-global / program-global type
{
let typesLookup = this.program.typesLookup;
let type: Type | null;
if (
(type = typesLookup.get(localName)) ||
(type = typesLookup.get(globalName))
) {
if (!type.is(TypeFlags.REFERENCE) && node.isNullable) {
if (reportMode == ReportMode.REPORT) {
this.error(
DiagnosticCode.Basic_type_0_cannot_be_nullable,
node.range, type.toString()
);
}
}
return type;
}
}
// check built-in macro types
if (simpleName == "NATIVE") {
if (!(typeArguments && typeArguments.length == 1)) {
if (reportMode == ReportMode.REPORT) {
this.error(
DiagnosticCode.Expected_0_type_arguments_but_got_1,
typeNode.range, "1", (typeArgumentNodes ? typeArgumentNodes.length : 1).toString(10)
);
}
return null;
}
switch (typeArguments[0].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.VOID: return Type.void;
default: assert(false);
}
}
if (reportMode == ReportMode.REPORT) {
this.error(
DiagnosticCode.Cannot_find_name_0,
typeNode.name.range, globalName
);
}
return null;
}
/** Resolves a {@link SignatureNode} to a concrete {@link Signature}. */
resolveSignature(
node: SignatureNode,
contextualTypeArguments: Map<string,Type> | null = null,
reportMode: ReportMode = ReportMode.REPORT
): Signature | null {
var explicitThisType = node.explicitThisType;
var thisType: Type | null = null;
if (explicitThisType) {
thisType = this.resolveType(explicitThisType, contextualTypeArguments, reportMode);
if (!thisType) return null;
}
var parameterTypeNodes = node.parameters;
var numParameters = parameterTypeNodes.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 parameterTypeNode = parameterTypeNodes[i];
switch (parameterTypeNode.parameterKind) {
case ParameterKind.DEFAULT: {
requiredParameters = i + 1;
break;
}
case ParameterKind.REST: {
assert(i == numParameters);
hasRest = true;
break;
}
}
let parameterType = this.resolveType(
assert(parameterTypeNode.type),
contextualTypeArguments,
reportMode
);
if (!parameterType) return null;
parameterTypes[i] = parameterType;
parameterNames[i] = parameterTypeNode.name.text;
}
var returnTypeNode = node.returnType;
var returnType: Type | null;
if (returnTypeNode) {
returnType = this.resolveType(returnTypeNode, contextualTypeArguments, reportMode);
if (!returnType) return null;
} else {
returnType = Type.void;
}
var signature = new Signature(parameterTypes, returnType, thisType);
signature.parameterNames = parameterNames;
signature.requiredParameters = requiredParameters;
signature.hasRest = hasRest;
return signature;
}
/** Resolves an array of type arguments to concrete types. */
resolveTypeArguments(
typeParameters: TypeParameterNode[],
typeArgumentNodes: CommonTypeNode[] | null,
contextualTypeArguments: Map<string,Type>,
alternativeReportNode: Node | null = null,
reportMode: ReportMode = ReportMode.REPORT
): Type[] | null {
var minParameterCount = 0;
var maxParameterCount = 0;
for (let i = 0; i < typeParameters.length; ++i) {
if (!typeParameters[i].defaultType) ++minParameterCount;
++maxParameterCount;
}
var argumentCount = typeArgumentNodes ? typeArgumentNodes.length : 0;
if (argumentCount < minParameterCount || argumentCount > maxParameterCount) {
this.error(
DiagnosticCode.Expected_0_type_arguments_but_got_1,
argumentCount
? Range.join(
(<TypeNode[]>typeArgumentNodes)[0].range,
(<TypeNode[]>typeArgumentNodes)[argumentCount - 1].range
)
: assert(alternativeReportNode).range.atEnd,
(argumentCount < minParameterCount ? minParameterCount : maxParameterCount).toString(10),
argumentCount.toString(10)
);
return null;
}
var typeArguments = new Array<Type>(maxParameterCount);
for (let i = 0; i < maxParameterCount; ++i) {
let type = i < argumentCount
? this.resolveType( // reports
(<TypeNode[]>typeArgumentNodes)[i],
contextualTypeArguments,
reportMode
)
: this.resolveType( // reports
assert(typeParameters[i].defaultType),
contextualTypeArguments,
reportMode
);
if (!type) return null;
// TODO: check extendsType
contextualTypeArguments.set(typeParameters[i].name.text, type);
typeArguments[i] = type;
}
return typeArguments;
}
/** Resolves an identifier to the element it refers to. */
resolveIdentifier(
identifier: IdentifierExpression,
flow: Flow | null,
context: Element | null,
reportMode: ReportMode = ReportMode.REPORT
): Element | null {
var name = identifier.text;
var element: Element | null;
if (flow) {
let local = flow.lookupLocal(name);
if (local) {
this.currentThisExpression = null;
this.currentElementExpression = null;
return local;
}
}
if (context) {
switch (context.kind) {
case ElementKind.FUNCTION: { // use prototype
context = (<Function>context).prototype.parent;
break;
}
case ElementKind.CLASS: { // use prototype
context = (<Class>context).prototype.parent;
break;
}
}
// search context
while (context) {
let members = context.members;
if (members) {
if (element = members.get(name)) {
this.currentThisExpression = null;
this.currentElementExpression = null;
return element;
}
}
context = context.parent;
}
}
// search current file
var elementsLookup = this.program.elementsLookup;
if (element = elementsLookup.get(identifier.range.source.internalPath + PATH_DELIMITER + name)) {
this.currentThisExpression = null;
this.currentElementExpression = null;
return element; // GLOBAL, FUNCTION_PROTOTYPE, CLASS_PROTOTYPE
}
// search global scope
if (element = elementsLookup.get(name)) {
this.currentThisExpression = null;
this.currentElementExpression = null;
return element; // GLOBAL, FUNCTION_PROTOTYPE, CLASS_PROTOTYPE
}
if (reportMode == ReportMode.REPORT) {
this.error(
DiagnosticCode.Cannot_find_name_0,
identifier.range, name
);
}
return null;
}
/** Resolves a lazily compiled global, i.e. a static class field. */
ensureResolvedLazyGlobal(global: Global, reportMode: ReportMode = ReportMode.REPORT): bool {
if (global.is(CommonFlags.RESOLVED)) return true;
var resolveType = assert(global.declaration).type;
if (!resolveType) return false;
var resolvedType = this.resolveType(resolveType, null, reportMode);
if (!resolvedType) return false;
global.type = resolvedType;
global.set(CommonFlags.RESOLVED);
return true;
}
/** Resolves a property access to the element it refers to. */
resolvePropertyAccess(
propertyAccess: PropertyAccessExpression,
flow: Flow,
contextualType: Type,
reportMode: ReportMode = ReportMode.REPORT
): Element | null {
// start by resolving the lhs target (expression before the last dot)
var targetExpression = propertyAccess.expression;
var target = this.resolveExpression(targetExpression, flow, contextualType, reportMode); // reports
if (!target) return null;
// at this point we know exactly what the target is, so look up the element within
var propertyName = propertyAccess.property.text;
// Resolve variable-likes to the class type they reference first
switch (target.kind) {
case ElementKind.GLOBAL: if (!this.ensureResolvedLazyGlobal(<Global>target, reportMode)) return null;
case ElementKind.LOCAL:
case ElementKind.FIELD: {
let type = (<VariableLikeElement>target).type;
assert(type != Type.void);
let classReference = type.classReference;
if (!classReference) {
let basicClasses = this.program.basicClasses;
if (!type.is(TypeFlags.REFERENCE) && basicClasses.has(type.kind)) {
classReference = assert(basicClasses.get(type.kind));
} else {
this.error(
DiagnosticCode.Property_0_does_not_exist_on_type_1,
propertyAccess.property.range, propertyName, (<VariableLikeElement>target).type.toString()
);
return null;
}
}
target = classReference;
break;
}
case ElementKind.PROPERTY: {
let getter = this.resolveFunction(
assert((<Property>target).getterPrototype),
null,
makeMap<string,Type>(),
reportMode
);
if (!getter) return null;
let classReference = getter.signature.returnType.classReference;
if (!classReference) {
this.error(
DiagnosticCode.Property_0_does_not_exist_on_type_1,
propertyAccess.property.range, propertyName, getter.signature.returnType.toString()
);
return null;
}
target = classReference;
break;
}
case ElementKind.CLASS: {
let elementExpression = this.currentElementExpression;
if (elementExpression) {
let indexedGet = (<Class>target).lookupOverload(OperatorKind.INDEXED_GET);
if (!indexedGet) {
this.error(
DiagnosticCode.Index_signature_is_missing_in_type_0,
elementExpression.range, (<Class>target).internalName
);
return null;
}
let returnType = indexedGet.signature.returnType;
if (!(target = returnType.classReference)) {
this.error(
DiagnosticCode.Property_0_does_not_exist_on_type_1,
propertyAccess.property.range, propertyName, returnType.toString()
);
return null;
}
}
break;
}
}
// Look up the member within
switch (target.kind) {
case ElementKind.CLASS_PROTOTYPE:
case ElementKind.CLASS: {
do {
let members = target.members;
let member: Element | null;
if (members && (member = members.get(propertyName))) {
this.currentThisExpression = targetExpression;
this.currentElementExpression = null;
return member; // instance FIELD, static GLOBAL, FUNCTION_PROTOTYPE...
}
// traverse inherited static members on the base prototype if target is a class prototype
if (target.kind == ElementKind.CLASS_PROTOTYPE) {
if ((<ClassPrototype>target).basePrototype) {
target = <ClassPrototype>(<ClassPrototype>target).basePrototype;
} else {
break;
}
// traverse inherited instance members on the base class if target is a class instance
} else if (target.kind == ElementKind.CLASS) {
if ((<Class>target).base) {
target = <Class>(<Class>target).base;
} else {
break;
}
} else {
break;
}
} while (true);
break;
}
default: { // enums or other namespace-like elements
let members = target.members;
if (members) {
let member = members.get(propertyName);
if (member) {
this.currentThisExpression = targetExpression;
this.currentElementExpression = null;
return member; // static ENUMVALUE, static GLOBAL, static FUNCTION_PROTOTYPE...
}
}
break;
}
}
this.error(
DiagnosticCode.Property_0_does_not_exist_on_type_1,
propertyAccess.property.range, propertyName, target.internalName
);
return null;
}
resolveElementAccess(
elementAccess: ElementAccessExpression,
flow: Flow,
contextualType: Type,
reportMode: ReportMode = ReportMode.REPORT
): Element | null {
var targetExpression = elementAccess.expression;
var target = this.resolveExpression(targetExpression, flow, contextualType, reportMode);
if (!target) return null;
switch (target.kind) {
case ElementKind.GLOBAL: if (!this.ensureResolvedLazyGlobal(<Global>target, reportMode)) return null;
case ElementKind.LOCAL:
case ElementKind.FIELD: {
let type = (<VariableLikeElement>target).type;
if (target = type.classReference) {
this.currentThisExpression = targetExpression;
this.currentElementExpression = elementAccess.elementExpression;
return target;
}
break;
}
case ElementKind.CLASS: {
let indexedGet = (<Class>target).lookupOverload(OperatorKind.INDEXED_GET);
if (!indexedGet) {
if (reportMode == ReportMode.REPORT) {
this.error(
DiagnosticCode.Index_signature_is_missing_in_type_0,
elementAccess.range, (<Class>target).internalName
);
}
return null;
}
if (targetExpression.kind == NodeKind.ELEMENTACCESS) { // nested element access
let returnType = indexedGet.signature.returnType;
if (target = returnType.classReference) {
this.currentThisExpression = targetExpression;
this.currentElementExpression = elementAccess.elementExpression;
return target;
}
return null;
}
this.currentThisExpression = targetExpression;
this.currentElementExpression = elementAccess.elementExpression;
return target;
}
}
if (reportMode == ReportMode.REPORT) {
this.error(
DiagnosticCode.Operation_not_supported,
targetExpression.range
);
}
return null;
}
determineIntegerLiteralType(
intValue: I64,
contextualType: Type
): Type {
if (!contextualType.is(TypeFlags.REFERENCE)) {
// compile to contextualType if matching
switch (contextualType.kind) {
case TypeKind.I8: {
if (i64_is_i8(intValue)) return Type.i8;
break;
}
case TypeKind.U8: {
if (i64_is_u8(intValue)) return Type.u8;
break;
}
case TypeKind.I16: {
if (i64_is_i16(intValue)) return Type.i16;
break;
}
case TypeKind.U16: {
if (i64_is_u16(intValue)) return Type.u16;
break;
}
case TypeKind.I32: {
if (i64_is_i32(intValue)) return Type.i32;
break;
}
case TypeKind.U32: {
if (i64_is_u32(intValue)) return Type.u32;
break;
}
case TypeKind.BOOL: {
if (i64_is_bool(intValue)) return Type.bool;
break;
}
case TypeKind.ISIZE: {
if (!this.program.options.isWasm64) {
if (i64_is_i32(intValue)) return Type.isize32;
break;
}
return Type.isize64;
}
case TypeKind.USIZE: {
if (!this.program.options.isWasm64) {
if (i64_is_u32(intValue)) return Type.usize32;
break;
}
return Type.usize64;
}
case TypeKind.I64: return Type.i64;
case TypeKind.U64: return Type.u64;
case TypeKind.F32: return Type.f32;
case TypeKind.F64: return Type.f64;
case TypeKind.VOID: break; // best fitting below
default: assert(false);
}
}
// otherwise compile to best fitting native type
if (i64_is_i32(intValue)) return Type.i32;
if (i64_is_u32(intValue)) return Type.u32;
return Type.i64;
}
resolveExpression(
expression: Expression,
flow: Flow,
contextualType: Type = Type.void,
reportMode: ReportMode = ReportMode.REPORT
): Element | null {
while (expression.kind == NodeKind.PARENTHESIZED) {
expression = (<ParenthesizedExpression>expression).expression;
}
switch (expression.kind) {
case NodeKind.ASSERTION: {
if ((<AssertionExpression>expression).assertionKind == AssertionKind.NONNULL) {
return this.resolveExpression(
(<AssertionExpression>expression).expression,
flow,
contextualType,
reportMode
);
}
let type = this.resolveType(
assert((<AssertionExpression>expression).toType),
flow.contextualTypeArguments,
reportMode
);
if (!type) return null;
let element: Element | null = type.classReference;
if (!element) {
let signature = type.signatureReference;
if (!signature) return null;
element = signature.asFunctionTarget(this.program);
}
this.currentThisExpression = null;
this.currentElementExpression = null;
return element;
}
case NodeKind.UNARYPREFIX: {
// TODO: overloads
switch ((<UnaryPrefixExpression>expression).operator) {
case Token.MINUS: {
let operand = (<UnaryPrefixExpression>expression).operand;
// implicitly negate if an integer literal to distinguish between i32/u32/i64
if (operand.kind == NodeKind.LITERAL && (<LiteralExpression>operand).literalKind == LiteralKind.INTEGER) {
let type = this.determineIntegerLiteralType(
i64_sub(i64_zero, (<IntegerLiteralExpression>operand).value),
contextualType
);
return assert(this.program.basicClasses.get(type.kind));
}
return this.resolveExpression(
operand,
flow,
contextualType,
reportMode
);
}
case Token.PLUS:
case Token.PLUS_PLUS:
case Token.MINUS_MINUS: {
return this.resolveExpression(
(<UnaryPrefixExpression>expression).operand,
flow,
contextualType,
reportMode
);
}
case Token.EXCLAMATION: {
return assert(this.program.basicClasses.get(TypeKind.BOOL));
}
case Token.TILDE: {
let resolvedOperand = this.resolveExpression(
(<UnaryPrefixExpression>expression).operand,
flow,
contextualType,
reportMode
);
if (!resolvedOperand) return null;
throw new Error("not implemented"); // TODO: should all elements have a corresponding type right away?
}
default: assert(false);
}
return null;
}
case NodeKind.UNARYPOSTFIX: {
// TODO: overloads
switch ((<UnaryPostfixExpression>expression).operator) {
case Token.PLUS_PLUS:
case Token.MINUS_MINUS: {
return this.resolveExpression(
(<UnaryPostfixExpression>expression).operand,
flow,
contextualType,
reportMode
);
}
default: assert(false);
}
return null;
}
case NodeKind.BINARY: {
// TODO: all sorts of unary and binary expressions, which means looking up overloads and
// evaluating their return types, knowing the semantics of different operators etc.
// should probably share that code with the compiler somehow, as it also does exactly this.
throw new Error("not implemented");
}
case NodeKind.THIS: { // -> Class / ClassPrototype
if (flow.is(FlowFlags.INLINE_CONTEXT)) {
let explicitLocal = flow.lookupLocal("this");
if (explicitLocal) {
this.currentThisExpression = null;
this.currentElementExpression = null;
return explicitLocal;
}
}
let parent = flow.parentFunction.parent;
if (parent) {
this.currentThisExpression = null;
this.currentElementExpression = null;
return parent;
}
if (reportMode == ReportMode.REPORT) {
this.error(
DiagnosticCode._this_cannot_be_referenced_in_current_location,
expression.range
);
}
return null;
}
case NodeKind.SUPER: { // -> Class
if (flow.is(FlowFlags.INLINE_CONTEXT)) {
let explicitLocal = flow.lookupLocal("super");
if (explicitLocal) {
this.currentThisExpression = null;
this.currentElementExpression = null;
return explicitLocal;
}
}
let parent = flow.actualFunction.parent;
if (parent && parent.kind == ElementKind.CLASS && (parent = (<Class>parent).base)) {
this.currentThisExpression = null;
this.currentElementExpression = null;
return parent;
}
if (reportMode == ReportMode.REPORT) {
this.error(
DiagnosticCode._super_can_only_be_referenced_in_a_derived_class,
expression.range
);
}
return null;
}
case NodeKind.IDENTIFIER: {
return this.resolveIdentifier(<IdentifierExpression>expression, flow, flow.actualFunction, reportMode);
}
case NodeKind.LITERAL: {
switch ((<LiteralExpression>expression).literalKind) {
case LiteralKind.INTEGER: {
return assert(
this.program.basicClasses.get(
this.determineIntegerLiteralType(
(<IntegerLiteralExpression>expression).value,
contextualType
).kind
)
);
}
case LiteralKind.FLOAT: {
this.currentThisExpression = expression;
this.currentElementExpression = null;
return assert(
this.program.basicClasses.get(
contextualType == Type.f32
? TypeKind.F32
: TypeKind.F64
)
);
}
case LiteralKind.STRING: {
this.currentThisExpression = expression;
this.currentElementExpression = null;
return this.program.stringInstance;
}
// case LiteralKind.ARRAY: // TODO
}
break;
}
case NodeKind.PROPERTYACCESS: {
return this.resolvePropertyAccess(
<PropertyAccessExpression>expression,
flow,
contextualType,
reportMode
);
}
case NodeKind.ELEMENTACCESS: {
return this.resolveElementAccess(
<ElementAccessExpression>expression,
flow,
contextualType,
reportMode
);
}
case NodeKind.CALL: {
let targetExpression = (<CallExpression>expression).expression;
let target = this.resolveExpression(targetExpression, flow, contextualType, reportMode);
if (!target) return null;
if (target.kind == ElementKind.FUNCTION_PROTOTYPE) {
let instance = this.resolveFunctionInclTypeArguments(
<FunctionPrototype>target,
(<CallExpression>expression).typeArguments,
makeMap<string,Type>(flow.contextualTypeArguments),
expression,
reportMode
);
if (!instance) return null;
let returnType = instance.signature.returnType;
let classType = returnType.classReference;
if (classType) {
// reuse resolvedThisExpression (might be property access)
// reuse resolvedElementExpression (might be element access)
return classType;
} else {
let signature = returnType.signatureReference;
if (signature) {
let functionTarget = signature.asFunctionTarget(this.program);
// reuse resolvedThisExpression (might be property access)
// reuse resolvedElementExpression (might be element access)
return functionTarget;
}
}
if (reportMode == ReportMode.REPORT) {
this.error(
DiagnosticCode.Cannot_invoke_an_expression_whose_type_lacks_a_call_signature_Type_0_has_no_compatible_call_signatures,
targetExpression.range, target.internalName
);
}
return null;
}
break;
}
}
if (reportMode == ReportMode.REPORT) {
this.error(
DiagnosticCode.Operation_not_supported,
expression.range
);
}
return null;
}
/** Resolves a function prototype to an instance using the specified concrete type arguments. */
resolveFunction(
prototype: FunctionPrototype,
typeArguments: Type[] | null,
contextualTypeArguments: Map<string,Type> = makeMap<string,Type>(),
reportMode: ReportMode = ReportMode.REPORT
): Function | null {
var classTypeArguments = prototype.classTypeArguments; // set only if partially resolved
var classInstanceKey = classTypeArguments ? typesToString(classTypeArguments) : "";
var instanceKey = typeArguments ? typesToString(typeArguments) : "";
var classInstances = prototype.instances.get(classInstanceKey);
if (classInstances) {
let instance = classInstances.get(instanceKey);
if (instance) return instance;
}
var declaration = prototype.declaration;
var isInstance = prototype.is(CommonFlags.INSTANCE);
var classPrototype = prototype.classPrototype;
// apply class type arguments if a partially resolved instance method
if (classTypeArguments) prototype.applyClassTypeArguments(contextualTypeArguments);
// override with function specific type arguments
var signatureNode = declaration.signature;
var functionTypeParameters = declaration.typeParameters;
var numFunctionTypeArguments: i32;
if (typeArguments && (numFunctionTypeArguments = typeArguments.length)) {
assert(functionTypeParameters && numFunctionTypeArguments == functionTypeParameters.length);
for (let i = 0; i < numFunctionTypeArguments; ++i) {
contextualTypeArguments.set(
(<TypeParameterNode[]>functionTypeParameters)[i].name.text,
typeArguments[i]
);
}
} else {
assert(!functionTypeParameters || functionTypeParameters.length == 0);
}
// resolve class if an instance method
var classInstance: Class | null = null;
var thisType: Type | null = null;
if (isInstance) {
classInstance = this.resolveClass(
assert(classPrototype),
classTypeArguments,
contextualTypeArguments,
reportMode
);
if (!classInstance) return null;
let explicitThisType = signatureNode.explicitThisType;
if (explicitThisType) {
thisType = this.resolveType(explicitThisType, contextualTypeArguments, reportMode);
if (!thisType) return null;
} else {
thisType = classInstance.type;
}
contextualTypeArguments.set("this", thisType);
} else {
if (signatureNode.explicitThisType) {
this.error(