From 852278ebe724b3dba1d9aebaa776d79c78a0e6c5 Mon Sep 17 00:00:00 2001
From: iddev5 <ayushbardhan5@gmail.com>
Date: Fri, 8 Jul 2022 18:03:55 +0530
Subject: [PATCH] js-runtime: Add Function.paramCount to get the number of
 parameters

---
 js-runtime/src/js-runtime.js | 4 ++++
 js-runtime/src/main.zig      | 6 ++++++
 2 files changed, 10 insertions(+)

diff --git a/js-runtime/src/js-runtime.js b/js-runtime/src/js-runtime.js
index 5524b78f..a33e86d5 100644
--- a/js-runtime/src/js-runtime.js
+++ b/js-runtime/src/js-runtime.js
@@ -327,6 +327,10 @@ const zig = {
     zig.functionCall(values[id], undefined, args, args_len, ret_ptr);
   },
 
+  zigGetParamCount(id) {
+    return values[id].length;
+  },
+
   zigConstructType(id, args, args_len, ret_ptr) {
     let memory = new MemoryBlock(zig.wasm.exports.memory.buffer);
     let argv = [];
diff --git a/js-runtime/src/main.zig b/js-runtime/src/main.zig
index d4efa6b7..35846300 100644
--- a/js-runtime/src/main.zig
+++ b/js-runtime/src/main.zig
@@ -20,6 +20,7 @@ const js = struct {
     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 zigGetParamCount(id: u64) u32;
     extern fn zigConstructType(id: u64, args: ?*const anyopaque, args_len: u32, ret_ptr: *anyopaque) void;
     extern fn zigCleanupObject(id: u64) void;
 };
@@ -142,6 +143,11 @@ pub const Function = struct {
         return .{ .tag = .func, .val = .{ .ref = func.ref } };
     }
 
+    pub fn paramCount(func: *const Function) usize {
+        // FIXME: native functions would always return 0
+        return js.zigGetParamCount(func.ref);
+    }
+
     pub fn construct(func: *const Function, args: []const Value) Value {
         var ret: Value = undefined;
         js.zigConstructType(func.ref, args.ptr, args.len, &ret);