initial tests for arguments length

[jtenner]

⯈ Initial attempt on implementing arguments.length

• [x] I've read the contributing guidelines

[jtenner]

(func $builtins/arglength1 (param $0 i32)
 (local $1 i32)
 (local $2 i32)
 global.get $~lib/memory/__stack_pointer
 i32.const 4
 i32.sub
 global.set $~lib/memory/__stack_pointer
 call $~stack_check
 global.get $~lib/memory/__stack_pointer
 i32.const 0
 i32.store
+  global.get $~argumentsLength
+  local.set $1
 i32.const 1024
 local.set $2
 global.get $~lib/memory/__stack_pointer
 local.get $2
 i32.store
 local.get $2
 i32.const 2
 + call $~lib/builtins/arguments.get:length
 f64.convert_i32_s
 + call $~lib/builtins/arguments.get:length
 f64.convert_i32_s
 f64.const 0
 f64.const 0
 f64.const 0
 call $~lib/builtins/trace
 global.get $~lib/memory/__stack_pointer
 i32.const 4
 i32.add
 global.set $~lib/memory/__stack_pointer
)

I put a plus sign before the important bits. Looks like it's calling a function instead of getting a local.

[jtenner]

Of course, it adds a function like this:

+ (func $~lib/builtins/arguments.get:length (result i32)
+  (local $0 i32)
+  global.get $~argumentsLength
+  local.set $0
+  local.get $0
+ )

🙄