mirror of
https://github.com/denoland/deno
synced 2024-09-19 16:12:30 +00:00
401 lines
9.9 KiB
JavaScript
401 lines
9.9 KiB
JavaScript
// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
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"use strict";
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((window) => {
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const core = window.Deno.core;
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const ops = core.ops;
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const __bootstrap = window.__bootstrap;
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const {
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BigInt,
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ObjectDefineProperty,
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ArrayPrototypeMap,
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Number,
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NumberIsSafeInteger,
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ArrayPrototypeJoin,
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ObjectPrototypeIsPrototypeOf,
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PromisePrototypeThen,
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TypeError,
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Int32Array,
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Uint32Array,
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BigInt64Array,
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Function,
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} = window.__bootstrap.primordials;
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function unpackU64(returnValue) {
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if (typeof returnValue === "number") {
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return returnValue;
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}
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const [hi, lo] = returnValue;
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return BigInt(hi) << 32n | BigInt(lo);
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}
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function unpackI64(returnValue) {
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if (typeof returnValue === "number") {
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return returnValue;
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}
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const [hi, lo] = returnValue;
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const u64 = unpackU64([hi, lo]);
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return u64 >> 63n ? u64 - 0x10000000000000000n : u64;
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}
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class UnsafePointerView {
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pointer;
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constructor(pointer) {
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this.pointer = pointer;
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}
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getUint8(offset = 0) {
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return ops.op_ffi_read_u8(
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offset ? BigInt(this.pointer) + BigInt(offset) : this.pointer,
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);
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}
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getInt8(offset = 0) {
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return ops.op_ffi_read_i8(
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offset ? BigInt(this.pointer) + BigInt(offset) : this.pointer,
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);
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}
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getUint16(offset = 0) {
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return ops.op_ffi_read_u16(
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offset ? BigInt(this.pointer) + BigInt(offset) : this.pointer,
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);
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}
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getInt16(offset = 0) {
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return ops.op_ffi_read_i16(
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offset ? BigInt(this.pointer) + BigInt(offset) : this.pointer,
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);
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}
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getUint32(offset = 0) {
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return ops.op_ffi_read_u32(
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offset ? BigInt(this.pointer) + BigInt(offset) : this.pointer,
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);
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}
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getInt32(offset = 0) {
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return ops.op_ffi_read_i32(
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offset ? BigInt(this.pointer) + BigInt(offset) : this.pointer,
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);
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}
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getBigUint64(offset = 0) {
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return ops.op_ffi_read_u64(
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offset ? BigInt(this.pointer) + BigInt(offset) : this.pointer,
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);
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}
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getBigInt64(offset = 0) {
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return ops.op_ffi_read_i64(
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offset ? BigInt(this.pointer) + BigInt(offset) : this.pointer,
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);
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}
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getFloat32(offset = 0) {
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return ops.op_ffi_read_f32(
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offset ? BigInt(this.pointer) + BigInt(offset) : this.pointer,
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);
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}
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getFloat64(offset = 0) {
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return ops.op_ffi_read_f64(
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offset ? BigInt(this.pointer) + BigInt(offset) : this.pointer,
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);
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}
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getCString(offset = 0) {
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return ops.op_ffi_cstr_read(
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offset ? BigInt(this.pointer) + BigInt(offset) : this.pointer,
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);
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}
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static getCString(pointer, offset = 0) {
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return ops.op_ffi_cstr_read(
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offset ? BigInt(pointer) + BigInt(offset) : pointer,
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);
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}
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getArrayBuffer(byteLength, offset = 0) {
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return ops.op_ffi_get_buf(
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offset ? BigInt(this.pointer) + BigInt(offset) : this.pointer,
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byteLength,
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);
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}
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static getArrayBuffer(pointer, byteLength, offset = 0) {
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return ops.op_ffi_get_buf(
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offset ? BigInt(pointer) + BigInt(offset) : pointer,
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byteLength,
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);
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}
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copyInto(destination, offset = 0) {
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ops.op_ffi_buf_copy_into(
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offset ? BigInt(this.pointer) + BigInt(offset) : this.pointer,
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destination,
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destination.byteLength,
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);
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}
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static copyInto(pointer, destination, offset = 0) {
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ops.op_ffi_buf_copy_into(
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offset ? BigInt(pointer) + BigInt(offset) : pointer,
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destination,
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destination.byteLength,
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);
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}
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}
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class UnsafePointer {
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static of(value) {
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if (ObjectPrototypeIsPrototypeOf(UnsafeCallbackPrototype, value)) {
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return value.pointer;
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}
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return ops.op_ffi_ptr_of(value);
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}
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}
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function unpackNonblockingReturnValue(type, result) {
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if (
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typeof type === "object" && type !== null && "function" in type ||
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type === "pointer"
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) {
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return unpackU64(result);
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}
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switch (type) {
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case "isize":
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case "i64":
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return unpackI64(result);
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case "usize":
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case "u64":
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return unpackU64(result);
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default:
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return result;
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}
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}
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class UnsafeFnPointer {
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pointer;
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definition;
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constructor(pointer, definition) {
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this.pointer = pointer;
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this.definition = definition;
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}
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call(...parameters) {
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const resultType = this.definition.result;
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if (this.definition.nonblocking) {
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const promise = core.opAsync(
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"op_ffi_call_ptr_nonblocking",
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this.pointer,
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this.definition,
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parameters,
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);
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if (
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isReturnedAsBigInt(resultType)
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) {
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return PromisePrototypeThen(
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promise,
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(result) => unpackNonblockingReturnValue(resultType, result),
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);
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}
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return promise;
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} else {
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return ops.op_ffi_call_ptr(
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this.pointer,
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this.definition,
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parameters,
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);
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}
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}
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}
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function isPointerType(type) {
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return type === "buffer" || type === "pointer" ||
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typeof type === "object" && type !== null && "function" in type;
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}
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function isReturnedAsBigInt(type) {
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return isPointerType(type) || type === "u64" || type === "i64" ||
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type === "usize" || type === "isize";
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}
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function isI64(type) {
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return type === "i64" || type === "isize";
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}
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class UnsafeCallback {
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#refcount;
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#rid;
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definition;
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callback;
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pointer;
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constructor(definition, callback) {
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if (definition.nonblocking) {
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throw new TypeError(
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"Invalid UnsafeCallback, cannot be nonblocking",
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);
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}
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const [rid, pointer] = ops.op_ffi_unsafe_callback_create(
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definition,
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callback,
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);
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this.#refcount = 0;
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this.#rid = rid;
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this.pointer = pointer;
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this.definition = definition;
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this.callback = callback;
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}
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ref() {
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if (this.#refcount++ === 0) {
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ops.op_ffi_unsafe_callback_ref(true);
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}
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}
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unref() {
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// Only decrement refcount if it is positive, and only
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// unref the callback if refcount reaches zero.
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if (this.#refcount > 0 && --this.#refcount === 0) {
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ops.op_ffi_unsafe_callback_ref(false);
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}
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}
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close() {
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if (this.#refcount) {
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this.#refcount = 0;
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ops.op_ffi_unsafe_callback_ref(false);
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}
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core.close(this.#rid);
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}
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}
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const UnsafeCallbackPrototype = UnsafeCallback.prototype;
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class DynamicLibrary {
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#rid;
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symbols = {};
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constructor(path, symbols) {
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[this.#rid, this.symbols] = ops.op_ffi_load({ path, symbols });
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for (const symbol in symbols) {
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if ("type" in symbols[symbol]) {
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const type = symbols[symbol].type;
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if (type === "void") {
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throw new TypeError(
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"Foreign symbol of type 'void' is not supported.",
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);
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}
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const name = symbols[symbol].name || symbol;
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const value = ops.op_ffi_get_static(
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this.#rid,
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name,
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type,
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);
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ObjectDefineProperty(
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this.symbols,
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symbol,
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{
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configurable: false,
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enumerable: true,
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value,
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writable: false,
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},
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);
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continue;
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}
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const resultType = symbols[symbol].result;
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const needsUnpacking = isReturnedAsBigInt(resultType);
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const isNonBlocking = symbols[symbol].nonblocking;
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if (isNonBlocking) {
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ObjectDefineProperty(
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this.symbols,
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symbol,
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{
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configurable: false,
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enumerable: true,
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value: (...parameters) => {
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const promise = core.opAsync(
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"op_ffi_call_nonblocking",
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this.#rid,
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symbol,
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parameters,
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);
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if (needsUnpacking) {
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return PromisePrototypeThen(
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promise,
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(result) =>
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unpackNonblockingReturnValue(resultType, result),
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);
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}
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return promise;
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},
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writable: false,
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},
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);
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}
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if (needsUnpacking && !isNonBlocking) {
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const call = this.symbols[symbol];
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const parameters = symbols[symbol].parameters;
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const vi = new Int32Array(2);
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const vui = new Uint32Array(vi.buffer);
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const b = new BigInt64Array(vi.buffer);
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const params = ArrayPrototypeJoin(
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ArrayPrototypeMap(parameters, (_, index) => `p${index}`),
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", ",
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);
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// Make sure V8 has no excuse to not optimize this function.
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this.symbols[symbol] = new Function(
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"vi",
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"vui",
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"b",
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"call",
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"NumberIsSafeInteger",
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"Number",
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`return function (${params}) {
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call(${params}${parameters.length > 0 ? ", " : ""}vi);
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${
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isI64(resultType)
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? `const n1 = Number(b[0])`
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: `const n1 = vui[0] + 2 ** 32 * vui[1]` // Faster path for u64
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};
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if (NumberIsSafeInteger(n1)) return n1;
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return b[0];
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}`,
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)(vi, vui, b, call, NumberIsSafeInteger, Number);
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}
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}
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}
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close() {
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core.close(this.#rid);
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}
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}
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function dlopen(path, symbols) {
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// URL support is progressively enhanced by util in `runtime/js`.
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const pathFromURL = __bootstrap.util.pathFromURL ?? ((p) => p);
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return new DynamicLibrary(pathFromURL(path), symbols);
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}
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window.__bootstrap.ffi = {
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dlopen,
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UnsafeCallback,
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UnsafePointer,
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UnsafePointerView,
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UnsafeFnPointer,
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};
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})(this);
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