855628 - Assertion failure: (objBits >> 47) == 0, at ./jsval.h:712

Status: RESOLVED INCOMPLETE

(Core :: JavaScript Engine, defect)

Description

[Julius Canute]

User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20100101 Firefox/17.0
Build ID: 20130307074601

Steps to reproduce:

I compiled SpiderMonkey 17.0.4esrpre with the following configuration options on AIX:

./configure --disable-tracejit --disable-methodjit --enable-debug=-g --disable-tests

I used gcc and g++ for compilation which are at version 4.6.3. I was building 64bit version of SpiderMonkey 17.0.4esrpre.


Actual results:

When I tried to launch SpiderMonkey ./js17, I got the following error:
Assertion failure: (objBits >> 47) == 0, at ./jsval.h:712


Expected results:

SpiderMonkey should have launched and a prompt should have appeared "js>".

Comment 1

[Boris Zbarsky [:bzbarsky]]

Julius, it sounds like AIX 64-bit actually uses 64 bits of pointers, not the 47 that x86-64 does.

Spidermonkey's boxing setup relies on only 47 bits being used for pointers, so you will need to make sure your allocator is enforcing that....

Comment 2

[Julius Canute]

How to ensure that AIX uses 47 bits for pointers?

Comment 3

[David Anderson [:dvander] - inactive, e-mail if emergency]

I don't see any mmap() flags that would enable that, unfortunately. You'll have to compile a 32-bit version of SpiderMonkey (or investigate introducing a new struct layout for Value).