Hello
I am seeing a SIGTRAP generated in the LLINT code when I try and load up
a page. It happens as soon as the page tries to execute JavaScript.
The target is an 32 bit x86 machine. The SIGTRAP appears to happen when
it is checking the stack alignment. I have tried compiling the code
Thanks for the response Michael. Where does the code that does the
padding live? It may be that I need to add something in there. I can
try changing what the stack alignment should be, but from what I
understand the QNX OS should align to 16. Maybe it is the exceptions
that are causing the
Rodney,
JavaScriptCore assumes that the stack is 16 byte aligned. This may be more
restrictive than some OS / ABIs, but there is code to pad appropriately for
some platforms. You didn’t say what OS you are running on, but maybe there
needs to be a code added for your OS. Turning on C++
We generally assume that calls into JavaScriptCore are made on an aligned
stack. So, to my knowledge, our code does not usually do dynamic stack
realignment. You should check the vmEntryToJavascript thunk - which gets called
when you make a call into JS from native code - to see if it does
Rodney,
The “align the stack” code for 32 bit platforms is found in
Source/JavaScriptCore/llint/LowLevelInterpreter32_64.asm
(http://trac.webkit.org/browser/trunk/Source/JavaScriptCore/llint/LowLevelInterpreter32_64.asm)
beginning at line 218. There isn’t an if / elsif for Linux or QNX. This
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