Yes, the first time the property is accessed, it gets the correct native
function. In my accessor before I return, I have:
global->SetAccessor(context,property,0);
global->CreateDataProperty(context,property,obj);
Then the property becomes undefined the second time on.
On Saturday, October 31, 2015 at 10:04:24 AM UTC-7, Alex Kodat wrote:
>
> CreateDataProperty or DefineOwnProperty should work. Of course, you have
> to make sure that the first time the function is accessed via the accessor
> when you do your override, you have to return the function from the
> accessor. But I assume you're doing that?
>
> On Friday, October 30, 2015 at 3:03:27 PM UTC-7, Jane Chen wrote:
>>
>> Is there anyway to use something like CreateDataProperty to override the
>> accessor so that the actual function is associated with the property,
>> albeit lazily created?
>>
>> I tried to use CreateDataProperty in place of ForceSet, since ForceSet is
>> deprecated, but that didn't do it, and my property becomes undefined.
>>
>> On Friday, October 30, 2015 at 2:12:12 AM UTC-7, Jakob Kummerow wrote:
>>>
>>> Well, the profile tells you which function was executed. It doesn't know
>>> or care what name you used to refer to this function -- it can't, as it's a
>>> sampling profiler. Pure-JS example:
>>>
>>> function f() { /* long-running stuff */ }
>>> var g = f;
>>> g(); // Shows up as "f" in the profile.
>>>
>>> In your example, the function is a C++ object, so it doesn't even have a
>>> name, so V8 tries to infer a name that it hopes is meaningful to a human
>>> reader. The point is that for a single function, it can only infer a single
>>> name.
>>>
>>> I think this is working as intended.
>>>
>>> On Thu, Oct 29, 2015 at 11:57 PM, Jane Chen <[email protected]> wrote:
>>>
>>>> A test case to demonstrate the issue can be found at:
>>>>
>>>> https://code.google.com/p/v8/issues/detail?id=4527
>>>>
>>>>
>>>> On Thursday, October 29, 2015 at 3:46:21 PM UTC-7, Jane Chen wrote:
>>>>>
>>>>> Testing profiling against v8 4.6.88.
>>>>>
>>>>> I have functions that are exposed through accessor callbacks. If a
>>>>> native function is set for multiple accessor properties, the last
>>>>> property
>>>>> shows up as the function name in the CpuProfileNode, regardless what name
>>>>> you set to the function returned by the accessor function. For example:
>>>>>
>>>>> global->SetAccessor(
>>>>> v8::String::NewFromUtf8(isolate, "print",
>>>>> v8::NewStringType::kNormal)
>>>>> .ToLocalChecked(),
>>>>> getFunction);
>>>>> global->SetAccessor(
>>>>> v8::String::NewFromUtf8(isolate, "read",
>>>>> v8::NewStringType::kNormal)
>>>>> .ToLocalChecked(),
>>>>> getFunction);
>>>>>
>>>>> Now "get read" is the function name in CpuProfileNode although print
>>>>> is called.
>>>>>
>>>>> Test script:
>>>>>
>>>>> function isPrime(num) {
>>>>> for (var count = 2; count < num; count++)
>>>>> if (num % count == 0) return false;
>>>>> return true;
>>>>> };
>>>>>
>>>>> var total = 0;
>>>>> for (var i = 2; i < 100000; i++) {
>>>>> if (isPrime(i)) {
>>>>> print(i);
>>>>> total++
>>>>> }
>>>>> };
>>>>> total;
>>>>>
>>>>> TotalHitCount:2233
>>>>>
>>>>> FunctionName:(root)
>>>>> LineNumber:0
>>>>> ColumnNumber:0
>>>>> HitCount:0
>>>>> FunctionName:(program)
>>>>> LineNumber:0
>>>>> ColumnNumber:0
>>>>> HitCount:7
>>>>> FunctionName:
>>>>> LineNumber:0
>>>>> ColumnNumber:0
>>>>> HitCount:13
>>>>> FunctionName:isPrime
>>>>> LineNumber:1
>>>>> ColumnNumber:17
>>>>> HitCount:8
>>>>> FunctionName:
>>>>> LineNumber:1
>>>>> ColumnNumber:1
>>>>> HitCount:2196
>>>>> FunctionName:get read
>>>>> LineNumber:0
>>>>> ColumnNumber:0
>>>>> HitCount:2
>>>>> FunctionName:(garbage collector)
>>>>> LineNumber:0
>>>>> ColumnNumber:0
>>>>> HitCount:7
>>>>>
>>>>>
>>>>> Given that an accessor callback takes a property name, it should allow
>>>>> one native function to handle multiple properties. Is this a bug, or am
>>>>> I
>>>>> doing something wrong?
>>>>>
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>>>
>>>
>>>
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