Found FunctionTemplate::HasInstance(). Please let me know if there's a
better way to do it.
On Tuesday, October 21, 2014 8:03:40 PM UTC-7, Jane Chen wrote:
>
> I'm using 3.24.
>
> I create a FunctionTemplate with my own callback function for toString:
>
> v8::Local<v8::FunctionTemplate> result =
> v8::FunctionTemplate::New(isolate,valueCstor);
> result->SetClassName(className);
> result->InstanceTemplate()->SetInternalFieldCount(VALUE_TEMP_ID_COUNT);
> * result->PrototypeTemplate()->Set(*
> * v8::String::NewFromUtf8(isolate, "toString"),*
> * v8::FunctionTemplate::New(isolate, valueToString));*
>
> Everything works fine with functions created through the above, except
> when I try to get the prototype of it:
>
> var v = new Value();
> v.__proto__;
>
> Removing the highlighted lines fixes the issue.
>
> Here's the stack:
>
> Stacktrace (dead0000-dead0001) 0x3cc891104221 0x3cc891104149:
> ==== JS stack trace =========================================
>
> Security context: 0x1fa4ac285451 <JS Object>#0#
> 1: DefaultNumber [native runtime.js:381] (this=0x1fa4ac263541 <JS
> Object>#1#,a=0x3cc891104221 <Map(elements=0)>#2#)
> 2: ToNumber(aka ToNumber) [native runtime.js:317] (this=0x1fa4ac204121
> <undefined>,a=0x3cc891104221 <Map(elements=0)>#2#)
> 3: ToInteger [native runtime.js:357] (this=0x1fa4ac285561 <JS Global
> Object>#3#,a=0x3cc891104221 <Map(elements=0)>#2#)
> 7: DefaultString [native runtime.js:396] (this=0x1fa4ac263541 <JS
> Object>#1#,a=0xb357401bcf9 <JS Object>#4#)
> 8: ToString [native runtime.js:334] (this=0x1fa4ac285561 <JS Global
> Object>#3#,a=0xb357401bcf9 <JS Object>#4#)
>
> ==== Details ================================================
>
> [1]: DefaultNumber [native runtime.js:381] (this=0x1fa4ac263541 <JS
> Object>#1#,a=0x3cc891104221 <Map(elements=0)>#2#) {
> // stack-allocated locals
> var b = 0x1fa4ac204121 <undefined>
> var c = 0x1fa4ac204121 <undefined>
> var d = 0x1fa4ac204121 <undefined>
> var e = 0x1fa4ac204121 <undefined>
> // expression stack (top to bottom)
> [05] : 0x8824290ee39 <String[7]: valueOf>
> [04] : 0x3cc891104221 <Map(elements=0)>#2#
> --------- s o u r c e c o d e ---------
> function DefaultNumber(a){?var
> b=a.valueOf;?if((%_ClassOf(b)==='Function')){?var
> c=%_CallFunction(a,b);?if(%IsPrimitive(c))return c;?}?var
> d=a.toString;?if((%_ClassOf(d)==='Function')){?var
> e=%_CallFunction(a,d);?if(%IsPrimitive(e))return e;?}?throw
> %MakeTypeError('cannot_convert_to_primitive',[]);?}
> -----------------------------------------
> }
>
> [2]: ToNumber(aka ToNumber) [native runtime.js:317] (this=0x1fa4ac204121
> <undefined>,a=0x3cc891104221 <Map(elements=0)>#2#) {
> // expression stack (top to bottom)
> [04] : 0x3cc891104221 <Map(elements=0)>#2#
> [03] : 0x1fa4ac263541 <JS Object>#1#
> [02] : 0x1fa4ac282c49 <JS Function DefaultNumber (SharedFunctionInfo
> 0x1fa4ac21f9c1)>#5#
> [01] : 0x1fa4ac204121 <undefined>
> [00] : 0x1fa4ac273191 <JS Function ToNumber (SharedFunctionInfo
> 0x1fa4ac21f161)>#6#
> --------- s o u r c e c o d e ---------
> function ToNumber(a){?if((typeof(a)==='number'))return
> a;?if((typeof(a)==='string')){?return
> %_HasCachedArrayIndex(a)?%_GetCachedArrayIndex(a)?:%StringToNumber(a);?}?if((typeof(a)==='boolean'))return
>
> a?1:0;?if((typeof(a)==='undefined'))return
> $NaN;?if((typeof(a)==='symbol'))return
> $NaN;?return((a===null))?0:ToNumber...
>
> -----------------------------------------
> }
>
> [3]: ToInteger [native runtime.js:357] (this=0x1fa4ac285561 <JS Global
> Object>#3#,a=0x3cc891104221 <Map(elements=0)>#2#) {
> // expression stack (top to bottom)
> [02] : 0x3cc891104221 <Map(elements=0)>#2#
> [01] : 0x1fa4ac204121 <undefined>
> [00] : 0x1fa4ac273191 <JS Function ToNumber (SharedFunctionInfo
> 0x1fa4ac21f161)>#6#
> --------- s o u r c e c o d e ---------
> function ToInteger(a){?if(%_IsSmi(a))return a;?return
> %NumberToInteger(ToNumber(a));?}
> -----------------------------------------
> }
>
> [7]: DefaultString [native runtime.js:396] (this=0x1fa4ac263541 <JS
> Object>#1#,a=0xb357401bcf9 <JS Object>#4#) {
> // stack-allocated locals
> var b = 0x1fa4ac287621 <JS Function toString (SharedFunctionInfo
> 0x1fa4ac287591)>#7#
> var c = 0x1fa4ac204121 <undefined>
> var d = 0x1fa4ac204121 <undefined>
> var e = 0x1fa4ac204121 <undefined>
> // expression stack (top to bottom)
> [05] : 0x1fa4ac287621 <JS Function toString (SharedFunctionInfo
> 0x1fa4ac287591)>#7#
> [04] : 0xb357401bcf9 <JS Object>#4#
> --------- s o u r c e c o d e ---------
> function DefaultString(a){?var
> b=a.toString;?if((%_ClassOf(b)==='Function')){?var
> c=%_CallFunction(a,b);?if(%IsPrimitive(c))return c;?}?var
> d=a.valueOf;?if((%_ClassOf(d)==='Function')){?var
> e=%_CallFunction(a,d);?if(%IsPrimitive(e))return e;?}?throw
> %MakeTypeError('cannot_convert_to_primitive',[]);?}
> -----------------------------------------
> }
>
> [8]: ToString [native runtime.js:334] (this=0x1fa4ac285561 <JS Global
> Object>#3#,a=0xb357401bcf9 <JS Object>#4#) {
> // expression stack (top to bottom)
> [04] : 0xb357401bcf9 <JS Object>#4#
> [03] : 0x1fa4ac263541 <JS Object>#1#
> [02] : 0x1fa4ac279a39 <JS Function DefaultString (SharedFunctionInfo
> 0x1fa4ac21fa51)>#8#
> [01] : 0x1fa4ac263541 <JS Object>#1#
> [00] : 0x1fa4ac26db11 <JS Function ToString (SharedFunctionInfo
> 0x1fa4ac21f2d9)>#9#
> --------- s o u r c e c o d e ---------
> function ToString(a){?if((typeof(a)==='string'))return
> a;?if((typeof(a)==='number'))return
> %_NumberToString(a);?if((typeof(a)==='boolean'))return
> a?'true':'false';?if((typeof(a)==='undefined'))return'undefined';?return((a===null))?'null':%ToString(%DefaultString(a));?}
> -----------------------------------------
> }
>
> ==== Key ============================================
>
> #0# 0x1fa4ac285451: 0x1fa4ac285451 <JS Object>
> #1# 0x1fa4ac263541: 0x1fa4ac263541 <JS Object>
> #2# 0x3cc891104221: 0x3cc891104221 <Map(elements=0)>
> #3# 0x1fa4ac285561: 0x1fa4ac285561 <JS Global Object>
> #4# 0xb357401bcf9: 0xb357401bcf9 <JS Object>
> #5# 0x1fa4ac282c49: 0x1fa4ac282c49 <JS Function DefaultNumber
> (SharedFunctionInfo 0x1fa4ac21f9c1)>
> #6# 0x1fa4ac273191: 0x1fa4ac273191 <JS Function ToNumber
> (SharedFunctionInfo 0x1fa4ac21f161)>
> #7# 0x1fa4ac287621: 0x1fa4ac287621 <JS Function toString
> (SharedFunctionInfo 0x1fa4ac287591)>
> #8# 0x1fa4ac279a39: 0x1fa4ac279a39 <JS Function DefaultString
> (SharedFunctionInfo 0x1fa4ac21fa51)>
> #9# 0x1fa4ac26db11: 0x1fa4ac26db11 <JS Function ToString
> (SharedFunctionInfo 0x1fa4ac21f2d9)>
> =====================
>
> Questions: Is this a bug or am I doing something wrong? Anyway I can
> work around it?
>
> Thanks,
> Jane
>
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