js-runtime: Upload source code from upstream

js-runtime/.gitignore

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+zig-out/
+zig-cache/

js-runtime/README.md

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+# mach-js-runtime

js-runtime/build.zig

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+const std = @import("std");
+
+pub fn build(b: *std.build.Builder) void {
+    const mode = b.standardReleaseOptions();
+
+    const main_tests = b.addTest("src/main.zig");
+    main_tests.addPackage(pkg);
+    main_tests.setBuildMode(mode);
+
+    const test_step = b.step("test", "Run library tests");
+    test_step.dependOn(&main_tests.step);
+}
+
+pub const pkg = std.build.Pkg{
+    .name = "js-runtime",
+    .source = .{ .path = thisDir() ++ "/src/main.zig" },
+    .dependencies = &[_]std.build.Pkg{},
+};
+
+fn thisDir() []const u8 {
+    return std.fs.path.dirname(@src().file) orelse ".";
+}

js-runtime/src/js-runtime.js

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+let text_decoder = new TextDecoder();
+let text_encoder = new TextEncoder();
+let log_buf = "";
+
+let uindex = 0;
+let indices = [];
+let values = [];
+let value_map = {};
+
+class MemoryBlock {
+  constructor(mem, offset = 0) {
+    this.mem = mem;
+    this.offset = offset;
+  }
+
+  slice(offset) {
+    return new MemoryBlock(this.mem, offset);
+  }
+
+  getMemory() {
+    return new DataView(this.mem, this.offset);
+  }
+
+  getU8(offset) {
+    return this.getMemory().getUint8(offset, true);
+  }
+
+  getU32(offset) {
+    return this.getMemory().getUint32(offset, true);
+  }
+
+  getU64(offset) {
+    const ls = this.getU32(offset);
+    const ms = this.getU32(offset + 4);
+
+    return ls + ms * 4294967296;
+  }
+
+  getF64(offset) {
+    return this.getMemory().getFloat64(offset, true);
+  }
+
+  getString(offset, len) {
+    return text_decoder.decode(new Uint8Array(this.mem, offset, len));
+  }
+
+  setU8(offset, data) {
+    this.getMemory().setUint8(offset, data, true);
+  }
+
+  setU32(offset, data) {
+    this.getMemory().setUint32(offset, data, true);
+  }
+
+  setU64(offset, data) {
+    this.getMemory().setUint32(offset, data, true);
+    this.getMemory().setUint32(offset + 4, Math.floor(data / 4294967296), true);
+  }
+
+  setF64(offset, data) {
+    this.getMemory().setFloat64(offset, data, true);
+  }
+
+  setString(offset, str) {
+    const string = text_encoder.encode(str);
+    const buffer = new Uint8Array(this.mem, offset, string.length);
+    for (let i = 0; i < string.length; i += 1) {
+      buffer[i] = string[i];
+    }
+  }
+}
+
+const zig = {
+  wasm: undefined,
+  buffer: undefined,
+
+  init(wasm) {
+    this.wasm = wasm;
+
+    values = [];
+    value_map = [];
+    this.addValue(globalThis);
+  },
+
+  addValue(value) {
+    value.__proto__.__uindex = uindex;
+    let idx = indices.pop();
+    if (idx !== undefined) {
+      values[idx] = value;
+    } else {
+      idx = values.push(value) - 1;
+    }
+    value_map[uindex] = idx;
+    uindex += 1;
+    return idx;
+  },
+
+  zigCreateMap() {
+    return zig.addValue(new Map());
+  },
+
+  zigCreateArray() {
+    return zig.addValue(new Array());
+  },
+
+  zigCreateString(str, len) {
+    let memory = new MemoryBlock(zig.wasm.exports.memory.buffer);
+    return zig.addValue(memory.getString(str, len));
+  },
+
+  zigCreateFunction(id) {
+    return zig.addValue(function () {
+      const args = zig.addValue(arguments);
+      zig.wasm.exports.wasmCallFunction(id, args, arguments.length);
+      const return_value = values[args]["return_value"];
+      zig.zigCleanupObject(args);
+      return return_value;
+    });
+  },
+
+  getType(value) {
+    switch (typeof value) {
+      case "object":
+        switch (value) {
+          case null:
+            return 4;
+          default:
+            return 0;
+        }
+        break;
+      case "number":
+        return 1;
+      case "boolean":
+        return 2;
+      case "string":
+        return 3;
+      case "undefined":
+        return 5;
+      case "function":
+        return 6;
+    }
+  },
+
+  writeObject(block, data, type) {
+    switch (type) {
+      case 0:
+      case 6:
+        block.setU8(0, type);
+        block.setU64(8, data);
+        break;
+      case 1:
+        block.setU8(0, 1);
+        block.setF64(8, data);
+        break;
+      case 2:
+        block.setU8(0, 2);
+        block.setU8(8, data);
+        break;
+      case 3:
+        block.setU8(0, 3);
+        block.setU64(8, data);
+        break;
+      case 4:
+        block.setU8(0, 4);
+        break;
+      case 5:
+        block.setU8(0, 5);
+        break;
+    }
+  },
+
+  readObject(block, memory) {
+    switch (block.getU8(0)) {
+      case 0:
+      case 7:
+        return values[block.getU64(8)];
+        break;
+      case 1:
+        return block.getF64(8);
+        break;
+      case 2:
+        return Boolean(block.getU8(8));
+        break;
+      case 3:
+        return values[block.getU64(8)];
+        break;
+      case 4:
+        return null;
+        break;
+      case 5:
+        return undefined;
+        break;
+    }
+  },
+
+  getPropertyEx(prop, ret_ptr, offset) {
+    let len = undefined;
+    const type = this.getType(prop);
+    switch (type) {
+      case 3:
+        len = prop.length;
+      case 0:
+      case 6:
+        if (prop in value_map) {
+          prop = value_map[prop.__uindex];
+        } else {
+          prop = zig.addValue(prop);
+        }
+        break;
+    }
+
+    if (len !== undefined) prop.__proto__.length = len;
+
+    let memory = new MemoryBlock(ret_ptr, offset);
+    zig.writeObject(memory, prop, type);
+  },
+
+  getProperty(prop, ret_ptr) {
+    return zig.getPropertyEx(prop, zig.wasm.exports.memory.buffer, ret_ptr);
+  },
+
+  zigGetProperty(id, name, len, ret_ptr) {
+    let memory = new MemoryBlock(zig.wasm.exports.memory.buffer);
+    let prop = values[id][memory.getString(name, len)];
+    zig.getProperty(prop, ret_ptr);
+  },
+
+  zigSetProperty(id, name, len, set_ptr) {
+    let memory = new MemoryBlock(zig.wasm.exports.memory.buffer);
+    values[id][memory.getString(name, len)] = zig.readObject(
+      memory.slice(set_ptr),
+      memory
+    );
+  },
+
+  zigDeleteProperty(id, name, len) {
+    let memory = new MemoryBlock(zig.wasm.exports.memory.buffer);
+    delete values[id][memory.getString(name, len)];
+  },
+
+  zigGetIndex(id, index, ret_ptr) {
+    let prop = values[id][index];
+    zig.getProperty(prop, ret_ptr);
+  },
+
+  zigSetIndex(id, index, set_ptr) {
+    let memory = new MemoryBlock(zig.wasm.exports.memory.buffer);
+    values[id][index] = zig.readObject(memory.slice(set_ptr), memory);
+  },
+
+  zigDeleteIndex(id, index) {
+    delete values[id][index];
+  },
+
+  zigCleanupObject(id) {
+    const idx = Number(id);
+    delete value_map[values[idx].__uindex];
+    delete values[idx];
+    indices.push(idx);
+  },
+
+  zigGetStringLength(val_id) {
+    return values[value_map[val_id]].length;
+  },
+
+  zigGetString(val_id, ptr) {
+    let memory = new MemoryBlock(zig.wasm.exports.memory.buffer);
+    memory.setString(ptr, values[value_map[val_id]]);
+  },
+
+  zigFunctionCall(id, name, len, args, args_len, ret_ptr) {
+    let memory = new MemoryBlock(zig.wasm.exports.memory.buffer);
+    let argv = [];
+    for (let i = 0; i < args_len; i += 1) {
+      argv.push(zig.readObject(memory.slice(args + i * 16), memory));
+    }
+    let result = values[id][memory.getString(name, len)].apply(
+      values[id],
+      argv
+    );
+
+    let length = undefined;
+    const type = zig.getType(result);
+    switch (type) {
+      case 3:
+        length = result.length;
+      case 0:
+      case 6:
+        result = zig.addValue(result);
+        break;
+    }
+
+    if (length !== undefined) result.__proto__.length = length;
+
+    zig.writeObject(memory.slice(ret_ptr), result, type);
+  },
+
+  zigFunctionInvoke(id, args, args_len, ret_ptr) {
+    let memory = new MemoryBlock(zig.wasm.exports.memory.buffer);
+    let argv = [];
+    for (let i = 0; i < args_len; i += 1) {
+      argv.push(zig.readObject(memory.slice(args + i * 16), memory));
+    }
+    let result = values[id].apply(undefined, argv);
+
+    let length = undefined;
+    const type = zig.getType(result);
+    switch (type) {
+      case 3:
+        length = result.length;
+      case 0:
+      case 6:
+        result = zig.addValue(result);
+        break;
+    }
+
+    if (length !== undefined) result.__proto__.length = length;
+
+    zig.writeObject(memory.slice(ret_ptr), result, type);
+  },
+
+  wzLogWrite(str, len) {
+    let memory = new MemoryBlock(zig.wasm.exports.memory.buffer);
+    log_buf += memory.getString(str, len);
+  },
+
+  wzLogFlush() {
+    console.log(log_buf);
+    log_buf = "";
+  },
+
+  wzPanic(str, len) {
+    let memory = new MemoryBlock(zig.wasm.exports.memory.buffer);
+    throw Error(memory.getString(str, len));
+  },
+};
+
+export { zig };

js-runtime/src/main.zig

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+const std = @import("std");
+const Allocator = std.mem.Allocator;
+const builtin = @import("builtin");
+
+const js = struct {
+    extern fn zigCreateMap() u32;
+    extern fn zigCreateArray() u32;
+    extern fn zigCreateString(str: [*]const u8, len: u32) u32;
+    extern fn zigCreateFunction(id: *const anyopaque) u32;
+    extern fn zigGetProperty(id: u64, name: [*]const u8, len: u32, ret_ptr: *anyopaque) void;
+    extern fn zigSetProperty(id: u64, name: [*]const u8, len: u32, set_ptr: *const anyopaque) void;
+    extern fn zigDeleteProperty(id: u64, name: [*]const u8, len: u32) void;
+    extern fn zigGetIndex(id: u64, index: u32, ret_ptr: *anyopaque) void;
+    extern fn zigSetIndex(id: u64, index: u32, set_ptr: *const anyopaque) void;
+    extern fn zigGetString(val_id: u64, ptr: [*]const u8) void;
+    extern fn zigGetStringLength(val_id: u64) u32;
+    extern fn zigDeleteIndex(id: u64, index: u32) void;
+    extern fn zigFunctionCall(id: u64, name: [*]const u8, len: u32, args: ?*const anyopaque, args_len: u32, ret_ptr: *anyopaque) void;
+    extern fn zigFunctionInvoke(id: u64, args: ?*const anyopaque, args_len: u32, ret_ptr: *anyopaque) void;
+    extern fn zigCleanupObject(id: u64) void;
+};
+
+pub const Value = extern struct {
+    tag: ValueTag,
+    val: extern union {
+        ref: u64,
+        num: f64,
+        bool: bool,
+    },
+
+    const ValueTag = enum(u8) {
+        ref,
+        num,
+        bool,
+        str,
+        nulled,
+        undef,
+        func_js,
+        func_zig,
+    };
+
+    pub const Tag = enum {
+        object,
+        num,
+        bool,
+        str,
+        nulled,
+        undef,
+        func,
+    };
+
+    pub fn is(val: *const Value, comptime tag: Tag) bool {
+        return switch (tag) {
+            .object => val.tag == .object,
+            .num => val.tag == .num,
+            .bool => val.tag == .bool,
+            .str => val.tag == .str,
+            .nulled => val.tag == .nulled,
+            .undef => val.tag == .undef,
+            .func => val.tag == .func_js or val.tag == .func_zig,
+        };
+    }
+
+    pub fn value(val: *const Value, comptime tag: Tag, allocator: ?std.mem.Allocator) switch (tag) {
+        .object => Object,
+        .num => f64,
+        .bool => bool,
+        .str => std.mem.Allocator.Error![]const u8,
+        .func => Function,
+        .nulled, .undef => @compileError("Cannot get null or undefined as a value"),
+    } {
+        return switch (tag) {
+            .object => Object{ .ref = val.val.ref },
+            .num => val.val.num,
+            .bool => val.val.bool,
+            .str => blk: {
+                const len = js.zigGetStringLength(val.val.ref);
+                var slice = try allocator.?.alloc(u8, len);
+                js.zigGetString(val.val.ref, slice.ptr);
+                break :blk slice;
+            },
+            .func => Function{ .ref = val.val.ref },
+            else => unreachable,
+        };
+    }
+};
+
+pub const Object = struct {
+    ref: u64,
+
+    pub fn deinit(obj: *const Object) void {
+        js.zigCleanupObject(obj.ref);
+    }
+
+    pub fn toValue(obj: *const Object) Value {
+        return .{ .tag = .ref, .val = .{ .ref = obj.ref } };
+    }
+
+    pub fn get(obj: *const Object, prop: []const u8) Value {
+        var ret: Value = undefined;
+        js.zigGetProperty(obj.ref, prop.ptr, @intCast(u32, prop.len), &ret);
+        return ret;
+    }
+
+    pub fn set(obj: *const Object, prop: []const u8, value: Value) void {
+        js.zigSetProperty(obj.ref, prop.ptr, @intCast(u32, prop.len), &value);
+    }
+
+    pub fn delete(obj: *const Object, prop: []const u8) void {
+        js.zigDeleteProperty(obj.ref, prop.ptr, @intCast(u32, prop.len));
+    }
+
+    pub fn getIndex(obj: *const Object, index: u32) Value {
+        var ret: Value = undefined;
+        js.zigGetIndex(obj.ref, index, &ret);
+        return ret;
+    }
+
+    pub fn setIndex(obj: *const Object, index: u32, value: Value) void {
+        js.zigSetIndex(obj.ref, index, &value);
+    }
+
+    pub fn deleteIndex(obj: *const Object, index: u32) void {
+        js.zigDeleteIndex(obj.ref, index);
+    }
+
+    pub fn call(obj: *const Object, fun: []const u8, args: []const Value) Value {
+        var ret: Value = undefined;
+        js.zigFunctionCall(obj.ref, fun.ptr, fun.len, args.ptr, args.len, &ret);
+        return ret;
+    }
+};
+
+pub const Function = struct {
+    ref: u64,
+
+    pub fn deinit(func: *const Function) void {
+        js.zigCleanupObject(func.ref);
+    }
+
+    pub fn toValue(func: *const Function) Value {
+        return .{ .tag = .func_zig, .val = .{ .ref = func.ref } };
+    }
+
+    pub fn invoke(func: *const Function, args: []const Value) Value {
+        var ret: Value = undefined;
+        js.zigFunctionInvoke(func.ref, args.ptr, args.len, &ret);
+        return ret;
+    }
+};
+
+export fn wasmCallFunction(id: *anyopaque, args: u32, len: u32) void {
+    const obj = Object{ .ref = args };
+    if (builtin.zig_backend == .stage1) {
+        obj.set("return_value", functions.items[@ptrToInt(id) - 1](obj, len));
+    } else {
+        var func = @ptrCast(*FunType, @alignCast(std.meta.alignment(*FunType), id));
+        obj.set("return_value", func(obj, len));
+    }
+}
+
+pub fn global() Object {
+    return Object{ .ref = 0 };
+}
+
+pub fn createMap() Object {
+    return .{ .ref = js.zigCreateMap() };
+}
+
+pub fn createArray() Object {
+    return .{ .ref = js.zigCreateArray() };
+}
+
+pub fn createString(string: []const u8) Value {
+    return .{ .tag = .str, .val = .{ .ref = js.zigCreateString(string.ptr, string.len) } };
+}
+
+pub fn createNumber(num: f64) Value {
+    return .{ .tag = .num, .val = .{ .num = num } };
+}
+
+pub fn createBool(val: bool) Value {
+    return .{ .tag = .bool, .val = .{ .bool = val } };
+}
+
+pub fn createNull() Value {
+    return .{ .tag = .nulled, .val = undefined };
+}
+
+pub fn createUndefined() Value {
+    return .{ .tag = .undef, .val = undefined };
+}
+
+const FunType = fn (args: Object, args_len: u32) Value;
+
+var functions: std.ArrayListUnmanaged(FunType) = .{};
+
+pub fn createFunction(fun: FunType) Function {
+    if (builtin.zig_backend == .stage1) {
+        functions.append(std.heap.page_allocator, fun) catch unreachable;
+        return .{ .ref = js.zigCreateFunction(@intToPtr(*anyopaque, functions.items.len)) };
+    }
+    return .{ .ref = js.zigCreateFunction(&fun) };
+}