From 85ccbfb0500955524ada2d2a3a045851c47e240d Mon Sep 17 00:00:00 2001 From: syumai Date: Thu, 4 Jan 2024 23:43:24 +0900 Subject: [PATCH 1/3] pass RuntimeContext on create Go instance --- cloudflare/cron/cron.go | 2 +- cmd/workers-assets-gen/assets/common/shim.mjs | 22 ++++++++----- cmd/workers-assets-gen/assets/wasm_exec_go.js | 12 +++++-- .../assets/wasm_exec_tinygo.js | 33 ++++++------------- handler.go | 9 ++--- internal/jsutil/jsutil.go | 2 ++ 6 files changed, 39 insertions(+), 41 deletions(-) diff --git a/cloudflare/cron/cron.go b/cloudflare/cron/cron.go index fb97360..9f6d6e1 100644 --- a/cloudflare/cron/cron.go +++ b/cloudflare/cron/cron.go @@ -78,5 +78,5 @@ func init() { return jsutil.NewPromise(cb) }) - js.Global().Set("runScheduler", runSchedulerCallback) + jsutil.Binding.Set("runScheduler", runSchedulerCallback) } diff --git a/cmd/workers-assets-gen/assets/common/shim.mjs b/cmd/workers-assets-gen/assets/common/shim.mjs index 2f33e6b..a3a483a 100644 --- a/cmd/workers-assets-gen/assets/common/shim.mjs +++ b/cmd/workers-assets-gen/assets/common/shim.mjs @@ -21,7 +21,7 @@ export function init(m) { mod = m; } -async function run() { +async function run(ctx) { let ready; const readyPromise = new Promise((resolve) => { ready = resolve; @@ -32,31 +32,35 @@ async function run() { ready: () => { ready() } }, }); - go.run(instance); + go.run(instance, ctx); await readyPromise; } -function createRuntimeContext(env, ctx) { +function createRuntimeContext(env, ctx, binding) { return { env, ctx, connect, + binding, }; } export async function fetch(req, env, ctx) { - await run(); - return handleRequest(req, createRuntimeContext(env, ctx)); + const binding = {}; + await run(createRuntimeContext(env, ctx, binding)); + return binding.handleRequest(req); } export async function scheduled(event, env, ctx) { - await run(); - return runScheduler(event, createRuntimeContext(env, ctx)); + const binding = {}; + await run(createRuntimeContext(env, ctx, binding)); + return binding.runScheduler(event); } // onRequest handles request to Cloudflare Pages export async function onRequest(ctx) { - await run(); + const binding = {}; const { request, env } = ctx; - return handleRequest(request, createRuntimeContext(env, ctx)); + await run(createRuntimeContext(env, ctx, binding)); + return binding.handleRequest(request); } \ No newline at end of file diff --git a/cmd/workers-assets-gen/assets/wasm_exec_go.js b/cmd/workers-assets-gen/assets/wasm_exec_go.js index e818734..b271d1a 100644 --- a/cmd/workers-assets-gen/assets/wasm_exec_go.js +++ b/cmd/workers-assets-gen/assets/wasm_exec_go.js @@ -462,19 +462,27 @@ }; } - async run(instance) { + async run(instance, context) { if (!(instance instanceof WebAssembly.Instance)) { throw new Error("Go.run: WebAssembly.Instance expected"); } this._inst = instance; this.mem = new DataView(this._inst.exports.mem.buffer); + const globalProxy = new Proxy(globalThis, { + get(target, prop) { + if (prop === 'context') { + return context; + } + return Reflect.get(...arguments); + } + }) this._values = [ // JS values that Go currently has references to, indexed by reference id NaN, 0, null, true, false, - globalThis, + globalProxy, this, ]; this._goRefCounts = new Array(this._values.length).fill(Infinity); // number of references that Go has to a JS value, indexed by reference id diff --git a/cmd/workers-assets-gen/assets/wasm_exec_tinygo.js b/cmd/workers-assets-gen/assets/wasm_exec_tinygo.js index 019e3f7..cd1699c 100644 --- a/cmd/workers-assets-gen/assets/wasm_exec_tinygo.js +++ b/cmd/workers-assets-gen/assets/wasm_exec_tinygo.js @@ -458,15 +458,23 @@ this.importObject.env = this.importObject.gojs; } - async run(instance) { + async run(instance, context) { this._inst = instance; + const globalProxy = new Proxy(global, { + get(target, prop) { + if (prop === 'context') { + return context; + } + return Reflect.get(...arguments); + } + }) this._values = [ // JS values that Go currently has references to, indexed by reference id NaN, 0, null, true, false, - global, + globalProxy, this, ]; this._goRefCounts = []; // number of references that Go has to a JS value, indexed by reference id @@ -513,25 +521,4 @@ }; } } - - if ( - global.require && - global.require.main === module && - global.process && - global.process.versions && - !global.process.versions.electron - ) { - if (process.argv.length != 3) { - console.error("usage: go_js_wasm_exec [wasm binary] [arguments]"); - process.exit(1); - } - - const go = new Go(); - WebAssembly.instantiate(fs.readFileSync(process.argv[2]), go.importObject).then((result) => { - return go.run(result.instance); - }).catch((err) => { - console.error(err); - process.exit(1); - }); - } })(); \ No newline at end of file diff --git a/handler.go b/handler.go index e6e54ad..d1d732c 100644 --- a/handler.go +++ b/handler.go @@ -17,14 +17,11 @@ var httpHandler http.Handler func init() { var handleRequestCallback js.Func handleRequestCallback = js.FuncOf(func(this js.Value, args []js.Value) any { - if len(args) > 2 { + if len(args) > 1 { panic(fmt.Errorf("too many args given to handleRequest: %d", len(args))) } reqObj := args[0] - runtimeCtxObj := js.Null() - if len(args) > 1 { - runtimeCtxObj = args[1] - } + runtimeCtxObj := jsutil.RuntimeContext var cb js.Func cb = js.FuncOf(func(_ js.Value, pArgs []js.Value) any { defer cb.Release() @@ -40,7 +37,7 @@ func init() { }) return jsutil.NewPromise(cb) }) - js.Global().Set("handleRequest", handleRequestCallback) + jsutil.Binding.Set("handleRequest", handleRequestCallback) } // handleRequest accepts a Request object and returns Response object. diff --git a/internal/jsutil/jsutil.go b/internal/jsutil/jsutil.go index 0e2f331..cd14c22 100644 --- a/internal/jsutil/jsutil.go +++ b/internal/jsutil/jsutil.go @@ -7,6 +7,8 @@ import ( ) var ( + RuntimeContext = js.Global().Get("context") + Binding = js.Global().Get("context").Get("binding") ObjectClass = js.Global().Get("Object") PromiseClass = js.Global().Get("Promise") RequestClass = js.Global().Get("Request") From d0a7609939a029c35590ddc1e8e0588812ad9a9d Mon Sep 17 00:00:00 2001 From: syumai Date: Thu, 4 Jan 2024 23:58:09 +0900 Subject: [PATCH 2/3] fix _ids of wasm_exec_go.js --- cmd/workers-assets-gen/assets/wasm_exec_go.js | 2 +- misc/wasm/go_js_wasm_exec | 17 +++++++++++++++++ 2 files changed, 18 insertions(+), 1 deletion(-) create mode 100755 misc/wasm/go_js_wasm_exec diff --git a/cmd/workers-assets-gen/assets/wasm_exec_go.js b/cmd/workers-assets-gen/assets/wasm_exec_go.js index b271d1a..fa3bd91 100644 --- a/cmd/workers-assets-gen/assets/wasm_exec_go.js +++ b/cmd/workers-assets-gen/assets/wasm_exec_go.js @@ -491,7 +491,7 @@ [null, 2], [true, 3], [false, 4], - [globalThis, 5], + [globalProxy, 5], [this, 6], ]); this._idPool = []; // unused ids that have been garbage collected diff --git a/misc/wasm/go_js_wasm_exec b/misc/wasm/go_js_wasm_exec new file mode 100755 index 0000000..ff59257 --- /dev/null +++ b/misc/wasm/go_js_wasm_exec @@ -0,0 +1,17 @@ +#!/usr/bin/env bash +# Copyright 2018 The Go Authors. All rights reserved. +# Use of this source code is governed by a BSD-style +# license that can be found in the LICENSE file. + +SOURCE="${BASH_SOURCE[0]}" +while [ -h "$SOURCE" ]; do + DIR="$( cd -P "$( dirname "$SOURCE" )" && pwd )" + SOURCE="$(readlink "$SOURCE")" + [[ $SOURCE != /* ]] && SOURCE="$DIR/$SOURCE" +done +DIR="$( cd -P "$( dirname "$SOURCE" )" && pwd )" + +# Increase the V8 stack size from the default of 984K +# to 8192K to ensure all tests can pass without hitting +# stack size limits. +exec node --stack-size=8192 "$DIR/wasm_exec_node.js" "$@" From dd4684b8171bdf239de60c5f083d9f12b144e0f6 Mon Sep 17 00:00:00 2001 From: syumai Date: Fri, 5 Jan 2024 00:03:52 +0900 Subject: [PATCH 3/3] fix test environment --- .github/workflows/pull_request.yaml | 3 +- Makefile | 2 +- misc/wasm/wasm_exec.js | 572 ++++++++++++++++++++++++++++ misc/wasm/wasm_exec_node.js | 39 ++ 4 files changed, 613 insertions(+), 3 deletions(-) create mode 100644 misc/wasm/wasm_exec.js create mode 100644 misc/wasm/wasm_exec_node.js diff --git a/.github/workflows/pull_request.yaml b/.github/workflows/pull_request.yaml index 9c2998c..8261015 100644 --- a/.github/workflows/pull_request.yaml +++ b/.github/workflows/pull_request.yaml @@ -22,5 +22,4 @@ jobs: - name: Test shell: bash run: | - export PATH=$(go env GOROOT)/misc/wasm:$PATH - GOOS=js GOARCH=wasm go test ./... \ No newline at end of file + PATH=$PWD/misc/wasm:$PATH GOOS=js GOARCH=wasm go test ./... \ No newline at end of file diff --git a/Makefile b/Makefile index 417b332..b2084f5 100644 --- a/Makefile +++ b/Makefile @@ -1,4 +1,4 @@ .PHONY: test test: - @GOOS=js GOARCH=wasm go test ./... + @PATH=$(CURDIR)/misc/wasm:$(PATH) GOOS=js GOARCH=wasm go test ./... diff --git a/misc/wasm/wasm_exec.js b/misc/wasm/wasm_exec.js new file mode 100644 index 0000000..15b6a16 --- /dev/null +++ b/misc/wasm/wasm_exec.js @@ -0,0 +1,572 @@ +// Copyright 2018 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +"use strict"; + +(() => { + const enosys = () => { + const err = new Error("not implemented"); + err.code = "ENOSYS"; + return err; + }; + + if (!globalThis.fs) { + let outputBuf = ""; + globalThis.fs = { + constants: { O_WRONLY: -1, O_RDWR: -1, O_CREAT: -1, O_TRUNC: -1, O_APPEND: -1, O_EXCL: -1 }, // unused + writeSync(fd, buf) { + outputBuf += decoder.decode(buf); + const nl = outputBuf.lastIndexOf("\n"); + if (nl != -1) { + console.log(outputBuf.substring(0, nl)); + outputBuf = outputBuf.substring(nl + 1); + } + return buf.length; + }, + write(fd, buf, offset, length, position, callback) { + if (offset !== 0 || length !== buf.length || position !== null) { + callback(enosys()); + return; + } + const n = this.writeSync(fd, buf); + callback(null, n); + }, + chmod(path, mode, callback) { callback(enosys()); }, + chown(path, uid, gid, callback) { callback(enosys()); }, + close(fd, callback) { callback(enosys()); }, + fchmod(fd, mode, callback) { callback(enosys()); }, + fchown(fd, uid, gid, callback) { callback(enosys()); }, + fstat(fd, callback) { callback(enosys()); }, + fsync(fd, callback) { callback(null); }, + ftruncate(fd, length, callback) { callback(enosys()); }, + lchown(path, uid, gid, callback) { callback(enosys()); }, + link(path, link, callback) { callback(enosys()); }, + lstat(path, callback) { callback(enosys()); }, + mkdir(path, perm, callback) { callback(enosys()); }, + open(path, flags, mode, callback) { callback(enosys()); }, + read(fd, buffer, offset, length, position, callback) { callback(enosys()); }, + readdir(path, callback) { callback(enosys()); }, + readlink(path, callback) { callback(enosys()); }, + rename(from, to, callback) { callback(enosys()); }, + rmdir(path, callback) { callback(enosys()); }, + stat(path, callback) { callback(enosys()); }, + symlink(path, link, callback) { callback(enosys()); }, + truncate(path, length, callback) { callback(enosys()); }, + unlink(path, callback) { callback(enosys()); }, + utimes(path, atime, mtime, callback) { callback(enosys()); }, + }; + } + + if (!globalThis.process) { + globalThis.process = { + getuid() { return -1; }, + getgid() { return -1; }, + geteuid() { return -1; }, + getegid() { return -1; }, + getgroups() { throw enosys(); }, + pid: -1, + ppid: -1, + umask() { throw enosys(); }, + cwd() { throw enosys(); }, + chdir() { throw enosys(); }, + } + } + + if (!globalThis.crypto) { + throw new Error("globalThis.crypto is not available, polyfill required (crypto.getRandomValues only)"); + } + + if (!globalThis.performance) { + throw new Error("globalThis.performance is not available, polyfill required (performance.now only)"); + } + + if (!globalThis.TextEncoder) { + throw new Error("globalThis.TextEncoder is not available, polyfill required"); + } + + if (!globalThis.TextDecoder) { + throw new Error("globalThis.TextDecoder is not available, polyfill required"); + } + + const encoder = new TextEncoder("utf-8"); + const decoder = new TextDecoder("utf-8"); + + globalThis.Go = class { + constructor() { + this.argv = ["js"]; + this.env = {}; + this.exit = (code) => { + if (code !== 0) { + console.warn("exit code:", code); + } + }; + this._exitPromise = new Promise((resolve) => { + this._resolveExitPromise = resolve; + }); + this._pendingEvent = null; + this._scheduledTimeouts = new Map(); + this._nextCallbackTimeoutID = 1; + + const setInt64 = (addr, v) => { + this.mem.setUint32(addr + 0, v, true); + this.mem.setUint32(addr + 4, Math.floor(v / 4294967296), true); + } + + const setInt32 = (addr, v) => { + this.mem.setUint32(addr + 0, v, true); + } + + const getInt64 = (addr) => { + const low = this.mem.getUint32(addr + 0, true); + const high = this.mem.getInt32(addr + 4, true); + return low + high * 4294967296; + } + + const loadValue = (addr) => { + const f = this.mem.getFloat64(addr, true); + if (f === 0) { + return undefined; + } + if (!isNaN(f)) { + return f; + } + + const id = this.mem.getUint32(addr, true); + return this._values[id]; + } + + const storeValue = (addr, v) => { + const nanHead = 0x7FF80000; + + if (typeof v === "number" && v !== 0) { + if (isNaN(v)) { + this.mem.setUint32(addr + 4, nanHead, true); + this.mem.setUint32(addr, 0, true); + return; + } + this.mem.setFloat64(addr, v, true); + return; + } + + if (v === undefined) { + this.mem.setFloat64(addr, 0, true); + return; + } + + let id = this._ids.get(v); + if (id === undefined) { + id = this._idPool.pop(); + if (id === undefined) { + id = this._values.length; + } + this._values[id] = v; + this._goRefCounts[id] = 0; + this._ids.set(v, id); + } + this._goRefCounts[id]++; + let typeFlag = 0; + switch (typeof v) { + case "object": + if (v !== null) { + typeFlag = 1; + } + break; + case "string": + typeFlag = 2; + break; + case "symbol": + typeFlag = 3; + break; + case "function": + typeFlag = 4; + break; + } + this.mem.setUint32(addr + 4, nanHead | typeFlag, true); + this.mem.setUint32(addr, id, true); + } + + const loadSlice = (addr) => { + const array = getInt64(addr + 0); + const len = getInt64(addr + 8); + return new Uint8Array(this._inst.exports.mem.buffer, array, len); + } + + const loadSliceOfValues = (addr) => { + const array = getInt64(addr + 0); + const len = getInt64(addr + 8); + const a = new Array(len); + for (let i = 0; i < len; i++) { + a[i] = loadValue(array + i * 8); + } + return a; + } + + const loadString = (addr) => { + const saddr = getInt64(addr + 0); + const len = getInt64(addr + 8); + return decoder.decode(new DataView(this._inst.exports.mem.buffer, saddr, len)); + } + + const timeOrigin = Date.now() - performance.now(); + this.importObject = { + _gotest: { + add: (a, b) => a + b, + }, + gojs: { + // Go's SP does not change as long as no Go code is running. Some operations (e.g. calls, getters and setters) + // may synchronously trigger a Go event handler. This makes Go code get executed in the middle of the imported + // function. A goroutine can switch to a new stack if the current stack is too small (see morestack function). + // This changes the SP, thus we have to update the SP used by the imported function. + + // func wasmExit(code int32) + "runtime.wasmExit": (sp) => { + sp >>>= 0; + const code = this.mem.getInt32(sp + 8, true); + this.exited = true; + delete this._inst; + delete this._values; + delete this._goRefCounts; + delete this._ids; + delete this._idPool; + this.exit(code); + }, + + // func wasmWrite(fd uintptr, p unsafe.Pointer, n int32) + "runtime.wasmWrite": (sp) => { + sp >>>= 0; + const fd = getInt64(sp + 8); + const p = getInt64(sp + 16); + const n = this.mem.getInt32(sp + 24, true); + fs.writeSync(fd, new Uint8Array(this._inst.exports.mem.buffer, p, n)); + }, + + // func resetMemoryDataView() + "runtime.resetMemoryDataView": (sp) => { + sp >>>= 0; + this.mem = new DataView(this._inst.exports.mem.buffer); + }, + + // func nanotime1() int64 + "runtime.nanotime1": (sp) => { + sp >>>= 0; + setInt64(sp + 8, (timeOrigin + performance.now()) * 1000000); + }, + + // func walltime() (sec int64, nsec int32) + "runtime.walltime": (sp) => { + sp >>>= 0; + const msec = (new Date).getTime(); + setInt64(sp + 8, msec / 1000); + this.mem.setInt32(sp + 16, (msec % 1000) * 1000000, true); + }, + + // func scheduleTimeoutEvent(delay int64) int32 + "runtime.scheduleTimeoutEvent": (sp) => { + sp >>>= 0; + const id = this._nextCallbackTimeoutID; + this._nextCallbackTimeoutID++; + this._scheduledTimeouts.set(id, setTimeout( + () => { + this._resume(); + while (this._scheduledTimeouts.has(id)) { + // for some reason Go failed to register the timeout event, log and try again + // (temporary workaround for https://github.com/golang/go/issues/28975) + console.warn("scheduleTimeoutEvent: missed timeout event"); + this._resume(); + } + }, + getInt64(sp + 8), + )); + this.mem.setInt32(sp + 16, id, true); + }, + + // func clearTimeoutEvent(id int32) + "runtime.clearTimeoutEvent": (sp) => { + sp >>>= 0; + const id = this.mem.getInt32(sp + 8, true); + clearTimeout(this._scheduledTimeouts.get(id)); + this._scheduledTimeouts.delete(id); + }, + + // func getRandomData(r []byte) + "runtime.getRandomData": (sp) => { + sp >>>= 0; + crypto.getRandomValues(loadSlice(sp + 8)); + }, + + // func finalizeRef(v ref) + "syscall/js.finalizeRef": (sp) => { + sp >>>= 0; + const id = this.mem.getUint32(sp + 8, true); + this._goRefCounts[id]--; + if (this._goRefCounts[id] === 0) { + const v = this._values[id]; + this._values[id] = null; + this._ids.delete(v); + this._idPool.push(id); + } + }, + + // func stringVal(value string) ref + "syscall/js.stringVal": (sp) => { + sp >>>= 0; + storeValue(sp + 24, loadString(sp + 8)); + }, + + // func valueGet(v ref, p string) ref + "syscall/js.valueGet": (sp) => { + sp >>>= 0; + const result = Reflect.get(loadValue(sp + 8), loadString(sp + 16)); + sp = this._inst.exports.getsp() >>> 0; // see comment above + storeValue(sp + 32, result); + }, + + // func valueSet(v ref, p string, x ref) + "syscall/js.valueSet": (sp) => { + sp >>>= 0; + Reflect.set(loadValue(sp + 8), loadString(sp + 16), loadValue(sp + 32)); + }, + + // func valueDelete(v ref, p string) + "syscall/js.valueDelete": (sp) => { + sp >>>= 0; + Reflect.deleteProperty(loadValue(sp + 8), loadString(sp + 16)); + }, + + // func valueIndex(v ref, i int) ref + "syscall/js.valueIndex": (sp) => { + sp >>>= 0; + storeValue(sp + 24, Reflect.get(loadValue(sp + 8), getInt64(sp + 16))); + }, + + // valueSetIndex(v ref, i int, x ref) + "syscall/js.valueSetIndex": (sp) => { + sp >>>= 0; + Reflect.set(loadValue(sp + 8), getInt64(sp + 16), loadValue(sp + 24)); + }, + + // func valueCall(v ref, m string, args []ref) (ref, bool) + "syscall/js.valueCall": (sp) => { + sp >>>= 0; + try { + const v = loadValue(sp + 8); + const m = Reflect.get(v, loadString(sp + 16)); + const args = loadSliceOfValues(sp + 32); + const result = Reflect.apply(m, v, args); + sp = this._inst.exports.getsp() >>> 0; // see comment above + storeValue(sp + 56, result); + this.mem.setUint8(sp + 64, 1); + } catch (err) { + sp = this._inst.exports.getsp() >>> 0; // see comment above + storeValue(sp + 56, err); + this.mem.setUint8(sp + 64, 0); + } + }, + + // func valueInvoke(v ref, args []ref) (ref, bool) + "syscall/js.valueInvoke": (sp) => { + sp >>>= 0; + try { + const v = loadValue(sp + 8); + const args = loadSliceOfValues(sp + 16); + const result = Reflect.apply(v, undefined, args); + sp = this._inst.exports.getsp() >>> 0; // see comment above + storeValue(sp + 40, result); + this.mem.setUint8(sp + 48, 1); + } catch (err) { + sp = this._inst.exports.getsp() >>> 0; // see comment above + storeValue(sp + 40, err); + this.mem.setUint8(sp + 48, 0); + } + }, + + // func valueNew(v ref, args []ref) (ref, bool) + "syscall/js.valueNew": (sp) => { + sp >>>= 0; + try { + const v = loadValue(sp + 8); + const args = loadSliceOfValues(sp + 16); + const result = Reflect.construct(v, args); + sp = this._inst.exports.getsp() >>> 0; // see comment above + storeValue(sp + 40, result); + this.mem.setUint8(sp + 48, 1); + } catch (err) { + sp = this._inst.exports.getsp() >>> 0; // see comment above + storeValue(sp + 40, err); + this.mem.setUint8(sp + 48, 0); + } + }, + + // func valueLength(v ref) int + "syscall/js.valueLength": (sp) => { + sp >>>= 0; + setInt64(sp + 16, parseInt(loadValue(sp + 8).length)); + }, + + // valuePrepareString(v ref) (ref, int) + "syscall/js.valuePrepareString": (sp) => { + sp >>>= 0; + const str = encoder.encode(String(loadValue(sp + 8))); + storeValue(sp + 16, str); + setInt64(sp + 24, str.length); + }, + + // valueLoadString(v ref, b []byte) + "syscall/js.valueLoadString": (sp) => { + sp >>>= 0; + const str = loadValue(sp + 8); + loadSlice(sp + 16).set(str); + }, + + // func valueInstanceOf(v ref, t ref) bool + "syscall/js.valueInstanceOf": (sp) => { + sp >>>= 0; + this.mem.setUint8(sp + 24, (loadValue(sp + 8) instanceof loadValue(sp + 16)) ? 1 : 0); + }, + + // func copyBytesToGo(dst []byte, src ref) (int, bool) + "syscall/js.copyBytesToGo": (sp) => { + sp >>>= 0; + const dst = loadSlice(sp + 8); + const src = loadValue(sp + 32); + if (!(src instanceof Uint8Array || src instanceof Uint8ClampedArray)) { + this.mem.setUint8(sp + 48, 0); + return; + } + const toCopy = src.subarray(0, dst.length); + dst.set(toCopy); + setInt64(sp + 40, toCopy.length); + this.mem.setUint8(sp + 48, 1); + }, + + // func copyBytesToJS(dst ref, src []byte) (int, bool) + "syscall/js.copyBytesToJS": (sp) => { + sp >>>= 0; + const dst = loadValue(sp + 8); + const src = loadSlice(sp + 16); + if (!(dst instanceof Uint8Array || dst instanceof Uint8ClampedArray)) { + this.mem.setUint8(sp + 48, 0); + return; + } + const toCopy = src.subarray(0, dst.length); + dst.set(toCopy); + setInt64(sp + 40, toCopy.length); + this.mem.setUint8(sp + 48, 1); + }, + + "debug": (value) => { + console.log(value); + }, + } + }; + } + + async run(instance) { + if (!(instance instanceof WebAssembly.Instance)) { + throw new Error("Go.run: WebAssembly.Instance expected"); + } + this._inst = instance; + this.mem = new DataView(this._inst.exports.mem.buffer); + const context = { + binding: {}, + }; + const globalProxy = new Proxy(globalThis, { + get(target, prop) { + if (prop === 'context') { + return context; + } + return Reflect.get(...arguments); + } + }) + this._values = [ // JS values that Go currently has references to, indexed by reference id + NaN, + 0, + null, + true, + false, + globalProxy, + this, + ]; + this._goRefCounts = new Array(this._values.length).fill(Infinity); // number of references that Go has to a JS value, indexed by reference id + this._ids = new Map([ // mapping from JS values to reference ids + [0, 1], + [null, 2], + [true, 3], + [false, 4], + [globalProxy, 5], + [this, 6], + ]); + this._idPool = []; // unused ids that have been garbage collected + this.exited = false; // whether the Go program has exited + + // Pass command line arguments and environment variables to WebAssembly by writing them to the linear memory. + let offset = 4096; + + const strPtr = (str) => { + const ptr = offset; + const bytes = encoder.encode(str + "\0"); + new Uint8Array(this.mem.buffer, offset, bytes.length).set(bytes); + offset += bytes.length; + if (offset % 8 !== 0) { + offset += 8 - (offset % 8); + } + return ptr; + }; + + const argc = this.argv.length; + + const argvPtrs = []; + this.argv.forEach((arg) => { + argvPtrs.push(strPtr(arg)); + }); + argvPtrs.push(0); + + const keys = Object.keys(this.env).sort(); + keys.forEach((key) => { + argvPtrs.push(strPtr(`${key}=${this.env[key]}`)); + }); + argvPtrs.push(0); + + const argv = offset; + argvPtrs.forEach((ptr) => { + this.mem.setUint32(offset, ptr, true); + this.mem.setUint32(offset + 4, 0, true); + offset += 8; + }); + + // The linker guarantees global data starts from at least wasmMinDataAddr. + // Keep in sync with cmd/link/internal/ld/data.go:wasmMinDataAddr. + const wasmMinDataAddr = 4096 + 8192; + if (offset >= wasmMinDataAddr) { + throw new Error("total length of command line and environment variables exceeds limit"); + } + + this._inst.exports.run(argc, argv); + if (this.exited) { + this._resolveExitPromise(); + } + await this._exitPromise; + } + + _resume() { + if (this.exited) { + throw new Error("Go program has already exited"); + } + this._inst.exports.resume(); + if (this.exited) { + this._resolveExitPromise(); + } + } + + _makeFuncWrapper(id) { + const go = this; + return function () { + const event = { id: id, this: this, args: arguments }; + go._pendingEvent = event; + go._resume(); + return event.result; + }; + } + } +})(); diff --git a/misc/wasm/wasm_exec_node.js b/misc/wasm/wasm_exec_node.js new file mode 100644 index 0000000..9860690 --- /dev/null +++ b/misc/wasm/wasm_exec_node.js @@ -0,0 +1,39 @@ +// Copyright 2021 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +"use strict"; + +if (process.argv.length < 3) { + console.error("usage: go_js_wasm_exec [wasm binary] [arguments]"); + process.exit(1); +} + +globalThis.require = require; +globalThis.fs = require("fs"); +globalThis.TextEncoder = require("util").TextEncoder; +globalThis.TextDecoder = require("util").TextDecoder; + +globalThis.performance ??= require("performance"); + +globalThis.crypto ??= require("crypto"); + +require("./wasm_exec"); + +const go = new Go(); +go.argv = process.argv.slice(2); +go.env = Object.assign({ TMPDIR: require("os").tmpdir() }, process.env); +go.exit = process.exit; +WebAssembly.instantiate(fs.readFileSync(process.argv[2]), go.importObject).then((result) => { + process.on("exit", (code) => { // Node.js exits if no event handler is pending + if (code === 0 && !go.exited) { + // deadlock, make Go print error and stack traces + go._pendingEvent = { id: 0 }; + go._resume(); + } + }); + return go.run(result.instance); +}).catch((err) => { + console.error(err); + process.exit(1); +});