What do you mean it needs to be same? I don't set it explicitly to any
value in my gn args file and it's "true" by default
v8_enable_31bit_smis_on_64bit_arch
Current value (from the default) = true
From //BUILD.gn:110
On Monday, June 8, 2020 at 8:43:31 AM UTC+2, Ben Noordhuis wrote:
>
> On Sat, Jun 6, 2020 at 12:05 AM Elmi Ahmadov <elmi...@gmail.com
> <javascript:>> wrote:
> >
> > Previously, I was using the V8 version 7.4.x and I have check method to
> test if the result object from the script execution is undefined/null or
> real object. Which works fine with the older version of the V8.
> >
> > But now, I'm using V8 version 8.1.307 and my check does not work
> anymore.
> >
> > This is the code snippet to reproduce the issue:
> > // create Isolate*, v8::Local<v8::Context>> and ...
> > v8::Handle<v8::Value> undefinedResult = v8::Undefined(isolate);
> > v8::Handle<v8::Value> nullResult = v8::Null(isolate);
> >
> > std::cout << "isUndefined: " << undefinedResult->IsUndefined() <<
> std::endl;
> > std::cout << "isNull: " << nullResult->IsNull() << std::endl;
> >
> > with the V8 version 7.4.x, the snippet produces the following output:
> > isUndefined: 1
> > isNull: 1
> >
> > But things turn out different for the V8 version 8.1.307, the same
> snippet produces a different output:
> > isUndefined: 0
> > isNull: 0
> >
> > This is my gn args to generate the monolithic V8 7.4.x library:
> > target_os = "linux"
> > target_cpu = "x64"
> > is_component_build = false
> > is_debug = false
> > use_custom_libcxx = false
> > v8_monolithic = true
> > v8_use_external_startup_data = false
> > symbol_level = 0
> > v8_enable_i18n_support= false
> >
> > I used the same gn args to generate the V8 version 8.1.307, but then V8
> immediatelly crashes when `->IsUndefined()`called. I found that V8 8.1
> contains a pointer compression feature so I disabled to see how this would
> effect the result, now there is no crash but wrong result.
> > target_os = "linux"
> > target_cpu = "x64"
> > is_component_build = false
> > is_debug = false
> > use_custom_libcxx = false
> > v8_monolithic = true
> > v8_use_external_startup_data = false
> > symbol_level = 0
> > v8_enable_i18n_support= false
> > v8_enable_pointer_compression = false
> >
> > What is the actual cause of this issue? How can I fix it? Maybe I'm
> missing something but I don't know what it is.
>
> v8_enable_31bit_smis_on_64bit_arch (corresponds to
> -DV8_31BIT_SMIS_ON_64BIT_ARCH) also needs to be the same when building
> V8 and your project.
>
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