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sysjs: Implement Object.copyBytes to copy over a slice to Js array type objects

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It works with Uint8Array objects only but no type checking is done right
now.

Originally authored by iddev5 :)

Signed-off-by: Stephen Gutekanst <stephen@hexops.com>
This commit is contained in:
Stephen Gutekanst 2022-08-27 12:02:30 -07:00 • committed by Stephen Gutekanst
parent 28fb75c7eb
commit 3e69c54e79
2 changed files with 19 additions and 0 deletions
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14
libs/sysjs/src/mach-sysjs.js
View file

@ -40,6 +40,10 @@ class MemoryBlock {
return this.getMemory().getFloat64(offset, true); return this.getMemory().getFloat64(offset, true);
} }
getSlice(offset, len) {
return new Uint8Array(this.mem, offset, len);
}
getString(offset, len) { getString(offset, len) {
return text_decoder.decode(new Uint8Array(this.mem, offset, len)); return text_decoder.decode(new Uint8Array(this.mem, offset, len));
} }
@ -252,6 +256,16 @@ const zig = {
delete values[id][index]; delete values[id][index];
}, },
zigCopyBytes(id, bytes, expected_length) {
let memory = new MemoryBlock(zig.wasm.exports.memory.buffer);
const array = values[id];
if (array.length != expected_length) {
throw Error("copyBytes given array of length " + expected_length + " but destination has length " + array.length);
}
const slice = memory.getSlice(bytes, array.length);
array.set(slice);
},
zigGetAttributeCount(id) { zigGetAttributeCount(id) {
let obj = values[id]; let obj = values[id];
return Object.keys(obj).length; return Object.keys(obj).length;

5
libs/sysjs/src/main.zig
View file

@ -18,6 +18,7 @@ const js = struct {
extern fn zigValueEqual(val: *const anyopaque, other: *const anyopaque) bool; extern fn zigValueEqual(val: *const anyopaque, other: *const anyopaque) bool;
extern fn zigValueInstanceOf(val: *const anyopaque, other: *const anyopaque) bool; extern fn zigValueInstanceOf(val: *const anyopaque, other: *const anyopaque) bool;
extern fn zigDeleteIndex(id: u64, index: u32) void; extern fn zigDeleteIndex(id: u64, index: u32) void;
extern fn zigCopyBytes(id: u64, bytes: [*]u8, expected_len: u32) void;
extern fn zigFunctionCall(id: u64, name: [*]const u8, len: u32, args: ?*const anyopaque, args_len: u32, ret_ptr: *anyopaque) 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 zigFunctionInvoke(id: u64, args: ?*const anyopaque, args_len: u32, ret_ptr: *anyopaque) void;
extern fn zigGetParamCount(id: u64) u32; extern fn zigGetParamCount(id: u64) u32;
@ -140,6 +141,10 @@ pub const Object = struct {
js.zigDeleteIndex(obj.ref, index); js.zigDeleteIndex(obj.ref, index);
} }
pub fn copyBytes(obj: *const Object, bytes: []u8) void {
js.zigCopyBytes(obj.ref, bytes.ptr, bytes.len);
}
pub fn call(obj: *const Object, fun: []const u8, args: []const Value) Value { pub fn call(obj: *const Object, fun: []const u8, args: []const Value) Value {
var ret: Value = undefined; var ret: Value = undefined;
js.zigFunctionCall(obj.ref, fun.ptr, @intCast(u32, fun.len), args.ptr, @intCast(u32, args.len), &ret); js.zigFunctionCall(obj.ref, fun.ptr, @intCast(u32, fun.len), args.ptr, @intCast(u32, args.len), &ret);