Macro | using Lambda makes "invalid call" error

[michael solomon]

Hey,
I'm trying to fix a macro lib(hxAnonCls), that broken somewhere after 3.1.3, the problem is in this line:

(untyped v.meta:Metadata).exists(function(m) return m.name == ":unbound")

v is type of haxe.macro.TVar

And this is the error:


E:\haxe\haxe\std/Lambda.hx:142: characters 12-14 : Invalid call
hxAnonCls/Macros.hx:334: characters 9-82 : Called from
E:\haxe\haxe\std/neko/_std/Array.hx:275: characters 12-18 : Called from
hxAnonCls/Macros.hx:467: characters 14-37 : Called from
E:\haxe\haxe\std/neko/_std/Array.hx:275: characters 12-18 : Called from
hxAnonCls/Macros.hx:467: characters 14-37 : Called from
hxAnonCls/Macros.hx:573: characters 9-28 : Called from
hxAnonCls/Macros.hx:88: characters 7-26 : Called from
hxAnonCls/AnonCls.hx:371: characters 18-55 : Called from
test/Test.hx:50: lines 50-53 : Called from
Aborted

Thanks all!!
Micahel

[Laurence Taylor]

try in hxAnonCls/hxAnonCls/Macros.hx

around line 332

var meta = (untyped v.meta:Metadata);
var res  = meta == null ? false : meta.exists(function(m) return m.name == ":unbound");

if (res)
    macro @:pos(te.pos) untyped $i{vName};
else
    macro @:pos(te.pos) $i{vName};

​

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[Laurence Taylor]

It could also be dce stripping code, maybe

[Laurence Taylor]

Wait, the error is from Lambda.hx, so:

var meta = (untyped v.meta:Metadata);
var res  = meta == null ? false : meta.exists(function(m) return m!=null && m.name == ":unbound");

if (res)
    macro @:pos(te.pos) untyped $i{vName};
else
    macro @:pos(te.pos) $i{vName};

[michael solomon]

Thx, but same results.
This is the full code:
https://github.com/andyli/hxAnonCls/blob/master/hxAnonCls/Macros.hx#L333

[Laurence Taylor]

Invalid Call is an error Nekovm issues, normally when a property is accessed on a null value. the thing to do is assertions or traces on values on the lines from the error callstack to figure out where the unexpected null is coming from.

[michael solomon]

digging more in the code and find that it isn't able to iterate over v.meta, i.e:

trace(1);
for (x in (untyped v.meta:Metadata)){
   trace(x);
}
trace(2);


output:

hxAnonCls/Macros.hx:333: 1
hxAnonCls/Macros.hx:337: 2

no print in the middle and v is no empty, the trace of v.meta is:

haxe\std/Lambda.hx:142: { ??? => #function:1, add => #function:3, get => #function:0, has => #function:1, remove => #function:1 }

any clue?

[michael solomon]

Solved https://github.com/andyli/hxAnonCls/issues/2

On Friday, February 10, 2017 at 7:13:09 PM UTC+2, michael solomon wrote: