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/**
* @fileoverview Mappings from AssemblyScript types to WebAssembly types.
* @license Apache-2.0
*/
import {
Class,
Program,
DecoratorFlags
} from "./program";
import {
NativeType,
createType
} from "./module";
/** Indicates the kind of a type. */
export const enum TypeKind {
// signed integers
/** An 8-bit signed integer. */
I8,
/** A 16-bit signed integer. */
I16,
/** A 32-bit signed integer. */
I32,
/** A 64-bit signed integer. */
I64,
/** A 32-bit/64-bit signed integer, depending on the target. */
ISIZE,
// unsigned integers
/** An 8-bit unsigned integer. */
U8,
/** A 16-bit unsigned integer. */
U16,
/** A 32-bit unsigned integer. Also the base of function types. */
U32,
/** A 64-bit unsigned integer. */
U64,
/** A 32-bit/64-bit unsigned integer, depending on the target. Also the base of class types. */
USIZE,
/** A 1-bit unsigned integer. */
BOOL, // sic
// floats
/** A 32-bit float. */
F32,
/** A 64-bit double. */
F64,
// vectors
/** A 128-bit vector. */
V128,
// references
/** Function reference. */
FUNCREF,
/** External reference. */
EXTERNREF,
/** Exception reference. */
EXNREF,
/** Any reference. */
ANYREF,
// other
/** No return type. */
VOID
}
/** Indicates capabilities of a type. */
export const enum TypeFlags {
NONE = 0,
/** Is a signed type that can represent negative values. */
SIGNED = 1 << 0,
/** Is an unsigned type that cannot represent negative values. */
UNSIGNED = 1 << 1,
/** Is an integer type. */
INTEGER = 1 << 2,
/** Is a floating point type. */
FLOAT = 1 << 3,
/** Is a varying (in size) type. */
VARYING = 1 << 4,
/** Is smaller than 32-bits. */
SHORT = 1 << 5,
/** Is larger than 32-bits. */
LONG = 1 << 6,
/** Is a value type. */
VALUE = 1 << 7,
/** Is a reference type (either a class or a function type). */
REFERENCE = 1 << 8,
/** Is a nullable type. */
NULLABLE = 1 << 9,
/** Is a vector type. */
VECTOR = 1 << 10,
/** Is an external type. */
EXTERNAL = 1 << 11,
/** Is a class. */
CLASS = 1 << 12,
/** Is a function. */
FUNCTION = 1 << 13
}
/** Represents a resolved type. */
export class Type {
/** Type kind. */
kind: TypeKind;
/** Type flags. */
flags: TypeFlags;
/** Size in bits. */
size: i32;
/** Size in bytes. */
byteSize: i32;
/** Underlying class reference, if a class type. */
classReference: Class | null;
/** Underlying signature reference, if a function type. */
signatureReference: Signature | null;
/** Respective non-nullable type, if nullable. */
private _nonNullableType: Type | null = null;
/** Respective nullable type, if non-nullable. */
private _nullableType: Type | null = null;
/** Constructs a new resolved type. */
constructor(kind: TypeKind, flags: TypeFlags, size: u32) {
this.kind = kind;
this.flags = flags;
this.size = size;
this.byteSize = <i32>ceil<f64>(<f64>size / 8);
this.classReference = null;
this.signatureReference = null;
if (!(flags & TypeFlags.NULLABLE)) {
this._nonNullableType = this;
} else {
this._nullableType = this;
}
}
/** Returns the closest int type representing this type. */
get intType(): Type {
if (this == Type.auto) return this; // keep auto as a hint
switch (this.kind) {
case TypeKind.I8: return Type.i8;
case TypeKind.I16: return Type.i16;
case TypeKind.F32:
case TypeKind.I32: return Type.i32;
case TypeKind.F64:
case TypeKind.I64: return Type.i64;
case TypeKind.ISIZE: return this.size == 64 ? Type.isize64 : Type.isize32;
case TypeKind.U8: return Type.u8;
case TypeKind.U16: return Type.u16;
case TypeKind.U32: return Type.u32;
case TypeKind.U64: return Type.u64;
case TypeKind.USIZE: return this.size == 64 ? Type.usize64 : Type.usize32;
case TypeKind.BOOL:
default: return Type.i32;
}
}
/** Substitutes this type with the auto type if this type is void. */
get exceptVoid(): Type {
if (this.kind == TypeKind.VOID) return Type.auto;
return this;
}
/** Gets this type's logarithmic alignment in memory. */
get alignLog2(): i32 {
return 31 - clz<i32>(this.byteSize);
}
/** Tests if this type represents a basic value. */
get isValue(): bool {
return this.is(TypeFlags.VALUE);
}
/** Tests if this type represents an integer value. */
get isIntegerValue(): bool {
return this.is(TypeFlags.INTEGER | TypeFlags.VALUE);
}
/** Tests if this type represents a small (< 32 bits) integer value. */
get isShortIntegerValue(): bool {
return this.is(TypeFlags.SHORT | TypeFlags.INTEGER | TypeFlags.VALUE);
}
/** Tests if this type represents a long (> 32 bits) integer value. */
get isLongIntegerValue(): bool {
return this.is(TypeFlags.LONG | TypeFlags.INTEGER | TypeFlags.VALUE);
}
/** Tests if this type represents a signed integer value. */
get isSignedIntegerValue(): bool {
return this.is(TypeFlags.SIGNED | TypeFlags.INTEGER | TypeFlags.VALUE);
}
/** Tests if this type represents an unsigned integer value. */
get isUnsignedIntegerValue(): bool {
return this.is(TypeFlags.UNSIGNED | TypeFlags.INTEGER | TypeFlags.VALUE);
}
/** Tests if this type represents a varying (in size) integer value. */
get isVaryingIntegerValue(): bool {
return this.is(TypeFlags.VARYING | TypeFlags.INTEGER | TypeFlags.VALUE);
}
/** Tests if this type represents an integer, including references. */
get isIntegerInclReference(): bool {
return this.is(TypeFlags.INTEGER);
}
/** Tests if this type represents a floating point value. */
get isFloatValue(): bool {
return this.is(TypeFlags.FLOAT | TypeFlags.VALUE);
}
/** Tests if this type represents a numeric (integer or floating point) value. */
get isNumericValue(): bool {
return this.isIntegerValue || this.isFloatValue;
}
/** Tests if this type represents a boolean value. */
get isBooleanValue(): bool {
return this == Type.bool;
}
/** Tests if this type represents a vector value. */
get isVectorValue(): bool {
return this.is(TypeFlags.VECTOR | TypeFlags.VALUE);
}
/** Tests if this type represents an internal or external reference. */
get isReference(): bool {
return this.is(TypeFlags.REFERENCE);
}
/** Tests if this type represents a nullable internal or external reference. */
get isNullableReference(): bool {
return this.is(TypeFlags.NULLABLE | TypeFlags.REFERENCE);
}
/** Tests if this type represents an internal object. */
get isInternalReference(): bool {
return this.is(TypeFlags.INTEGER | TypeFlags.REFERENCE);
}
/** Tests if this type represents an external object. */
get isExternalReference(): bool {
return this.is(TypeFlags.EXTERNAL | TypeFlags.REFERENCE);
}
/** Tests if this type represents a class. */
get isClass(): bool {
return this.isInternalReference
? this.classReference !== null
: false;
}
/** Gets the underlying class of this type, if any. */
getClass(): Class | null {
return this.isInternalReference
? this.classReference
: null;
}
/** Gets the underlying class or wrapper class of this type, if any. */
getClassOrWrapper(program: Program): Class | null {
let classReference = this.getClass();
if (classReference) {
// typical class
return classReference;
} else {
let signatureReference = this.getSignature();
if (signatureReference) {
// function wrapper
let type = signatureReference.type;
let wrapper = assert(program.resolver.resolveClass(program.functionPrototype, [ type ]));
wrapper.wrappedType = type;
return wrapper;
} else {
let wrapperClasses = program.wrapperClasses;
if (wrapperClasses.has(this)) {
// value wrapper
return assert(wrapperClasses.get(this));
}
}
}
return null;
}
/** Tests if this type represents a function. */
get isFunction(): bool {
return this.isInternalReference
? this.signatureReference !== null
: false;
}
/** Gets the underlying function signature of this type, if any. */
getSignature(): Signature | null {
return this.isInternalReference
? this.signatureReference
: null;
}
/** Tests if this is a managed type that needs GC hooks. */
get isManaged(): bool {
if (this.isInternalReference) {
let classReference = this.classReference;
if (classReference) return !classReference.hasDecorator(DecoratorFlags.UNMANAGED);
return this.signatureReference !== null; // function references are managed
}
return false;
}
/** Tests if this is a class type explicitly annotated as unmanaged. */
get isUnmanaged(): bool {
var classReference = this.classReference;
return classReference !== null && classReference.hasDecorator(DecoratorFlags.UNMANAGED);
}
/** Gets the corresponding non-nullable type. */
get nonNullableType(): Type {
if (this.isExternalReference) {
return this; // TODO
}
return assert(this._nonNullableType); // set either in ctor or asNullable
}
/** Gets the corresponding nullable type, if applicable. */
get nullableType(): Type | null {
return this._nullableType; // set either in ctor or asNullable
}
/** Computes the sign-extending shift in the target type. */
computeSmallIntegerShift(targetType: Type): i32 {
return targetType.size - this.size;
}
/** Computes the truncating mask in the target type. */
computeSmallIntegerMask(targetType: Type): i32 {
var size = this.is(TypeFlags.UNSIGNED) ? this.size : this.size - 1;
return ~0 >>> (targetType.size - size);
}
/** Tests if this type has (all of) the specified flags. */
is(flags: TypeFlags): bool { return (this.flags & flags) == flags; }
/** Tests if this type has any of the specified flags. */
isAny(flags: TypeFlags): bool { return (this.flags & flags) != 0; }
/** Composes the respective nullable type of this type. */
asNullable(): Type {
assert(this.isInternalReference);
var nullableType = this._nullableType;
if (!nullableType) {
assert(!this.isNullableReference);
this._nullableType = nullableType = new Type(this.kind, this.flags | TypeFlags.NULLABLE, this.size);
nullableType.classReference = this.classReference; // either a class reference
nullableType.signatureReference = this.signatureReference; // or a function reference
nullableType._nonNullableType = this;
}
return nullableType;
}
/** Tests if this type equals the specified. */
equals(other: Type): bool {
if (this.kind != other.kind) return false;
if (this.isReference) {
return (
this.classReference == other.classReference &&
this.signatureReference == other.signatureReference &&
this.isNullableReference == other.isNullableReference
);
}
return true;
}
/** Tests if a value of this type is assignable to the target type incl. implicit conversion. */
isAssignableTo(target: Type, signednessIsRelevant: bool = false): bool {
var currentClass: Class | null;
var targetClass: Class | null;
var currentFunction: Signature | null;
var targetFunction: Signature | null;
if (this.isReference) {
if (target.isReference) {
if (!this.isNullableReference || target.isNullableReference) {
if (currentClass = this.getClass()) {
if (targetClass = target.getClass()) {
return currentClass.isAssignableTo(targetClass);
}
} else if (currentFunction = this.getSignature()) {
if (targetFunction = target.getSignature()) {
return currentFunction.isAssignableTo(targetFunction);
}
} else if (this.isExternalReference && (this.kind == target.kind || target.kind == TypeKind.ANYREF)) {
return true;
}
}
}
} else if (!target.isReference) {
if (this.isIntegerValue) {
if (target.isIntegerValue) {
if (
!signednessIsRelevant ||
this.isBooleanValue || // a bool (0 or 1) can be safely assigned to all sorts of integers
this.isSignedIntegerValue == target.isSignedIntegerValue
) {
return this.size <= target.size;
}
} else if (target.kind == TypeKind.F32) {
return this.size <= 23; // mantissa bits
} else if (target.kind == TypeKind.F64) {
return this.size <= 52; // ^
}
} else if (this.isFloatValue) {
if (target.isFloatValue) {
return this.size <= target.size;
}
} else if (this.isVectorValue) {
if (target.isVectorValue) {
return this.size == target.size;
}
}
}
return false;
}
/** Tests if a value of this type is assignable to the target type excl. implicit conversion. */
isStrictlyAssignableTo(target: Type, signednessIsRelevant: bool = false): bool {
if (this.isReference) return this.isAssignableTo(target);
else if (target.isReference) return false;
// not dealing with references from here on
if (this.isIntegerValue) {
return target.isIntegerValue && target.size == this.size && (
!signednessIsRelevant ||
this.isSignedIntegerValue == target.isSignedIntegerValue
);
}
return this.kind == target.kind;
}
/** Tests if a value of this type can be changed to the target type using `changetype`. */
isChangeableTo(target: Type): bool {
// special in that it allows integer references as well
if (this.is(TypeFlags.INTEGER) && target.is(TypeFlags.INTEGER)) {
let size = this.size;
return size == target.size && (size >= 32 || this.is(TypeFlags.SIGNED) == target.is(TypeFlags.SIGNED));
}
return this.kind == target.kind;
}
/** Determines the common denominator type of two types, if there is any. */
static commonDenominator(left: Type, right: Type, signednessIsImportant: bool): Type | null {
if (right.isAssignableTo(left, signednessIsImportant)) return left;
else if (left.isAssignableTo(right, signednessIsImportant)) return right;
return null;
}
/** Converts this type to a string. */
toString(validWat: bool = false): string {
const nullablePostfix = validWat
? "|null"
: " | null";
if (this.isReference) {
let classReference = this.getClass();
if (classReference) {
return this.isNullableReference
? classReference.internalName + nullablePostfix
: classReference.internalName;
} else {
let signatureReference = this.getSignature();
if (signatureReference) {
return this.isNullableReference
? "(" + signatureReference.toString(validWat) + ")" + nullablePostfix
: signatureReference.toString(validWat);
}
}
}
switch (this.kind) {
case TypeKind.I8: return "i8";
case TypeKind.I16: return "i16";
case TypeKind.I32: return "i32";
case TypeKind.I64: return "i64";
case TypeKind.ISIZE: return "isize";
case TypeKind.U8: return "u8";
case TypeKind.U16: return "u16";
case TypeKind.U32: return "u32";
case TypeKind.U64: return "u64";
case TypeKind.USIZE: return "usize";
case TypeKind.BOOL: return "bool";
case TypeKind.F32: return "f32";
case TypeKind.F64: return "f64";
case TypeKind.V128: return "v128";
case TypeKind.FUNCREF: return "funcref";
case TypeKind.EXTERNREF: return "externref";
case TypeKind.EXNREF: return "exnref";
case TypeKind.ANYREF: return "anyref";
default: assert(false);
case TypeKind.VOID: return "void";
}
}
// Binaryen specific
/** Converts this type to its respective native type. */
toNativeType(): NativeType {
switch (this.kind) {
default: assert(false);
case TypeKind.I8:
case TypeKind.I16:
case TypeKind.I32:
case TypeKind.U8:
case TypeKind.U16:
case TypeKind.U32:
case TypeKind.BOOL: return NativeType.I32;
case TypeKind.ISIZE:
case TypeKind.USIZE: if (this.size != 64) return NativeType.I32;
case TypeKind.I64:
case TypeKind.U64: return NativeType.I64;
case TypeKind.F32: return NativeType.F32;
case TypeKind.F64: return NativeType.F64;
case TypeKind.V128: return NativeType.V128;
case TypeKind.FUNCREF: return NativeType.Funcref;
case TypeKind.EXTERNREF: return NativeType.Externref;
case TypeKind.EXNREF: return NativeType.Exnref;
case TypeKind.ANYREF: return NativeType.Anyref;
case TypeKind.VOID: return NativeType.None;
}
}
// Types
/** An 8-bit signed integer. */
static readonly i8: Type = new Type(TypeKind.I8,
TypeFlags.SIGNED |
TypeFlags.SHORT |
TypeFlags.INTEGER |
TypeFlags.VALUE, 8
);
/** A 16-bit signed integer. */
static readonly i16: Type = new Type(TypeKind.I16,
TypeFlags.SIGNED |
TypeFlags.SHORT |
TypeFlags.INTEGER |
TypeFlags.VALUE, 16
);
/** A 32-bit signed integer. */
static readonly i32: Type = new Type(TypeKind.I32,
TypeFlags.SIGNED |
TypeFlags.INTEGER |
TypeFlags.VALUE, 32
);
/** A 64-bit signed integer. */
static readonly i64: Type = new Type(TypeKind.I64,
TypeFlags.SIGNED |
TypeFlags.LONG |
TypeFlags.INTEGER |
TypeFlags.VALUE, 64
);
/** A 32-bit signed size. WASM32 only. */
static readonly isize32: Type = new Type(TypeKind.ISIZE,
TypeFlags.SIGNED |
TypeFlags.INTEGER |
TypeFlags.VARYING |
TypeFlags.VALUE, 32
);
/** A 64-bit signed size. WASM64 only. */
static readonly isize64: Type = new Type(TypeKind.ISIZE,
TypeFlags.SIGNED |
TypeFlags.LONG |
TypeFlags.INTEGER |
TypeFlags.VARYING |
TypeFlags.VALUE, 64
);
/** An 8-bit unsigned integer. */
static readonly u8: Type = new Type(TypeKind.U8,
TypeFlags.UNSIGNED |
TypeFlags.SHORT |
TypeFlags.INTEGER |
TypeFlags.VALUE, 8
);
/** A 16-bit unsigned integer. */
static readonly u16: Type = new Type(TypeKind.U16,
TypeFlags.UNSIGNED |
TypeFlags.SHORT |
TypeFlags.INTEGER |
TypeFlags.VALUE, 16
);
/** A 32-bit unsigned integer. */
static readonly u32: Type = new Type(TypeKind.U32,
TypeFlags.UNSIGNED |
TypeFlags.INTEGER |
TypeFlags.VALUE, 32
);
/** A 64-bit unsigned integer. */
static readonly u64: Type = new Type(TypeKind.U64,
TypeFlags.UNSIGNED |
TypeFlags.LONG |
TypeFlags.INTEGER |
TypeFlags.VALUE, 64
);
/** A 32-bit unsigned size. WASM32 only. */
static readonly usize32: Type = new Type(TypeKind.USIZE,
TypeFlags.UNSIGNED |
TypeFlags.INTEGER |
TypeFlags.VARYING |
TypeFlags.VALUE, 32
);
/** A 64-bit unsigned size. WASM64 only. */
static readonly usize64: Type = new Type(TypeKind.USIZE,
TypeFlags.UNSIGNED |
TypeFlags.LONG |
TypeFlags.INTEGER |
TypeFlags.VARYING |
TypeFlags.VALUE, 64
);
/** A 1-bit unsigned integer. */
static readonly bool: Type = new Type(TypeKind.BOOL,
TypeFlags.UNSIGNED |
TypeFlags.SHORT |
TypeFlags.INTEGER |
TypeFlags.VALUE, 1
);
/** A 32-bit float. */
static readonly f32: Type = new Type(TypeKind.F32,
TypeFlags.SIGNED |
TypeFlags.FLOAT |
TypeFlags.VALUE, 32
);
/** A 64-bit float. */
static readonly f64: Type = new Type(TypeKind.F64,
TypeFlags.SIGNED |
TypeFlags.LONG |
TypeFlags.FLOAT |
TypeFlags.VALUE, 64
);
/** A 128-bit vector. */
static readonly v128: Type = new Type(TypeKind.V128,
TypeFlags.VECTOR |
TypeFlags.VALUE, 128
);
/** Function reference. */
static readonly funcref: Type = new Type(TypeKind.FUNCREF,
TypeFlags.EXTERNAL |
TypeFlags.NULLABLE |
TypeFlags.REFERENCE, 0
);
/** External reference. */
static readonly externref: Type = new Type(TypeKind.EXTERNREF,
TypeFlags.EXTERNAL |
TypeFlags.NULLABLE |
TypeFlags.REFERENCE, 0
);
/** Exception reference. */
static readonly exnref: Type = new Type(TypeKind.EXNREF,
TypeFlags.EXTERNAL |
TypeFlags.NULLABLE |
TypeFlags.REFERENCE, 0
);
/** Any reference. */
static readonly anyref: Type = new Type(TypeKind.ANYREF,
TypeFlags.EXTERNAL |
TypeFlags.NULLABLE |
TypeFlags.REFERENCE, 0
);
/** No return type. */
static readonly void: Type = new Type(TypeKind.VOID, TypeFlags.NONE, 0);
/** Alias of i32 indicating type inference of locals and globals with just an initializer. */
static readonly auto: Type = new Type(Type.i32.kind, Type.i32.flags, Type.i32.size);
}
/** Converts an array of types to an array of native types. */
export function typesToNativeTypes(types: Type[]): NativeType[] {
var numTypes = types.length;
var ret = new Array<NativeType>(numTypes);
for (let i = 0; i < numTypes; ++i) ret[i] = types[i].toNativeType();
return ret;
}
/** Converts an array of types to its combined string representation. */
export function typesToString(types: Type[]): string {
var numTypes = types.length;
if (!numTypes) return "";
var sb = new Array<string>(numTypes);
for (let i = 0; i < numTypes; ++i) sb[i] = types[i].toString(true);
return sb.join(",");
}
/** Represents a fully resolved function signature. */
export class Signature {
/** Unique id representing this signature. */
id: u32 = 0;
/** Parameter types, if any, excluding `this`. */
parameterTypes: Type[];
/** Number of required parameters excluding `this`. Other parameters are considered optional. */
requiredParameters: i32;
/** Return type. */
returnType: Type;
/** This type, if an instance signature. */
thisType: Type | null;
/** Whether the last parameter is a rest parameter. */
hasRest: bool;
/** Respective function type. */
type: Type;
/** The program that created this signature. */
program: Program;
/** Constructs a new signature. */
constructor(
program: Program,
parameterTypes: Type[] | null = null,
returnType: Type | null = null,
thisType: Type | null = null
) {
this.parameterTypes = parameterTypes ? parameterTypes : [];
this.requiredParameters = 0;
this.returnType = returnType ? returnType : Type.void;
this.thisType = thisType;
this.program = program;
this.hasRest = false;
var usizeType = program.options.usizeType;
var type = new Type(usizeType.kind, usizeType.flags & ~TypeFlags.VALUE | TypeFlags.REFERENCE, usizeType.size);
this.type = type;
type.signatureReference = this;
var signatureTypes = program.uniqueSignatures;
var length = signatureTypes.length;
for (let i = 0; i < length; i++) {
let compare = signatureTypes[i];
if (this.equals(compare)) {
this.id = compare.id;
return this;
}
}
this.id = program.nextSignatureId++;
program.uniqueSignatures.push(this);
}
get nativeParams(): NativeType {
var thisType = this.thisType;
var parameterTypes = this.parameterTypes;
var numParameterTypes = parameterTypes.length;
if (!numParameterTypes) {
if (!thisType) return NativeType.None;
return thisType.toNativeType();
}
if (thisType) {
let nativeTypes = new Array<NativeType>(1 + numParameterTypes);
nativeTypes[0] = thisType.toNativeType();
for (let i = 0; i < numParameterTypes; ++i) {
nativeTypes[i + 1] = parameterTypes[i].toNativeType();
}
return createType(nativeTypes);
}
return createType(typesToNativeTypes(parameterTypes));
}
get nativeResults(): NativeType {
return this.returnType.toNativeType();
}
/** Tests if this signature equals the specified. */
equals(other: Signature): bool {
// check `this` type
var thisThisType = this.thisType;
var otherThisType = other.thisType;
if (thisThisType !== null) {
if (otherThisType === null || !thisThisType.equals(otherThisType)) return false;
} else if (otherThisType) {
return false;
}
// check rest parameter
if (this.hasRest != other.hasRest) return false;
// check parameter types
var thisParameterTypes = this.parameterTypes;
var otherParameterTypes = other.parameterTypes;
var numParameters = thisParameterTypes.length;
if (numParameters != otherParameterTypes.length) return false;
for (let i = 0; i < numParameters; ++i) {
if (!thisParameterTypes[i].equals(otherParameterTypes[i])) return false;
}
// check return type
return this.returnType.equals(other.returnType);
}
/** Tests if a value of this function type is assignable to a target of the specified function type. */
isAssignableTo(target: Signature, requireSameSize: bool = false): bool {
// check `this` type
var thisThisType = this.thisType;
var targetThisType = target.thisType;
if (thisThisType !== null) {
if (targetThisType === null || !thisThisType.isAssignableTo(targetThisType)) return false;
} else if (targetThisType) {
return false;
}
// check rest parameter
if (this.hasRest != target.hasRest) return false; // TODO
// check parameter types
var thisParameterTypes = this.parameterTypes;
var targetParameterTypes = target.parameterTypes;
var numParameters = thisParameterTypes.length;
if (numParameters != targetParameterTypes.length) return false; // TODO
for (let i = 0; i < numParameters; ++i) {
let thisParameterType = thisParameterTypes[i];
let targetParameterType = targetParameterTypes[i];
if (!thisParameterType.isAssignableTo(targetParameterType)) return false;
}
// check return type
var thisReturnType = this.returnType;
var targetReturnType = target.returnType;
return thisReturnType == targetReturnType || thisReturnType.isAssignableTo(targetReturnType);
}
/** Converts this signature to a string. */
toString(validWat: bool = false): string {
var sb = new Array<string>();
sb.push(validWat ? "%28" : "(");
var index = 0;
var thisType = this.thisType;
if (thisType) {
sb.push(validWat ? "this:" : "this: ");
assert(!thisType.signatureReference);
sb.push(thisType.toString(validWat));
index = 1;
}
var parameters = this.parameterTypes;
var numParameters = parameters.length;
if (numParameters) {
let optionalStart = this.requiredParameters;
let restIndex = this.hasRest ? numParameters - 1 : -1;
for (let i = 0; i < numParameters; ++i, ++index) {
if (index) sb.push(validWat ? "%2C" : ", ");
if (i == restIndex) sb.push("...");
sb.push(parameters[i].toString(validWat));
if (i >= optionalStart && i != restIndex) sb.push("?");
}
}
sb.push(validWat ? "%29=>" : ") => ");
sb.push(this.returnType.toString(validWat));
return sb.join("");
}
/** Creates a clone of this signature that is safe to modify. */
clone(): Signature {
var parameterTypes = this.parameterTypes;
var numParameterTypes = parameterTypes.length;
var cloneParameterTypes = new Array<Type>(numParameterTypes);
for (let i = 0; i < numParameterTypes; ++i) {
cloneParameterTypes[i] = parameterTypes[i];
}
return new Signature(this.program, cloneParameterTypes, this.returnType, this.thisType);
}
}