Comment #16 on issue 615 by [email protected]: "instanceof" operator
broken in V8 v2.0.6.4
http://code.google.com/p/v8/issues/detail?id=615
Sorry, I did mistype the "--".
instanceof is implemented as a simple loop in generated code which walks the
prototype chain. It could be that somehow the prototype chain of [] does
not include
the prototype property of the function denoted by Array. You could try:
new Array() instanceof Array
If that also doesn't work then I can take a look at the generated code, but
it should
be the same in release and debug mode.
If you take your debug build (the one that works), you can use:
./shell_g --print-code-stubs -e "print([] instanceof Array)"
You will get a bunch of output (you may want to redirect it to a file).
The last bit
printed will begin:
Instanceof
kind = STUB
name = Instanceof
that's the code for instanceof. Now, please try the same thing with a
release build,
but you have to enable the disassembler at build time:
scons arch=x64 library=shared sample=shell disassembler=on
./shell --print-code-stubs -e "print([] instanceof Array)"
If you could attach the relevant parts of the two disassemblies as files on
this bug
(just the Instanceof STUB part to the end), I'll take a look at them to
verify that
they're the same (modulo different addresses).
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