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Adding vars to debug_backtrace()

php.internals

Christian Schneider

22 years ago

Hey folks,
I'd like to add the local variables for all stack-frames to the result
of debug_backtrace(), i.e. each array entry contains a 'vars' field
pointing to the symbol table of that frame. A patch for PHP4/Zend is
attached.

Opinions?
- Chris

Christian Schneider

22 years ago

Oops, after I first added FREE_ZVAL(vars) to my patch to get rid of the
memory leak I now realized that it simply doesn't work like this. I
still have to learn about the memory management/gc of Zend I guess :-)

If you want to try my patch and don't care about a memory leak, remove
the line FREE_ZVAL(vars);

- Chris

Timm Friebe

22 years ago

On Sat, 2003-10-25 at 15:07, Christian Schneider wrote:
[...]

> I'd like to add the local variables for all stack-frames to the result
> of debug_backtrace(),

[...]

I'd like having this. Using declare(ticks = 1),
register_tick_function('debug'), and debug_backtrace() you'd be able to
build a simple debugger in PHP userland.

- Timm

Christian Schneider

22 years ago

Ok, I worked out a patch which does not leak memory. I don't think
thread-safety is an issue here but if anyone with deeper insight into
Zend sees any problem with this patch, please tell me.

What's the process (and chance :-)) of having this included in a future
version of PHP? Should I also look into making a PHP5/Zend2 version of it?

Comments welcome,
- Chris