chore: dump ast within error when reach undefined state

[xepozz]

It helps me when I reach the default case to understand what was it.

I think it may help others as well.

[TimWolla]

This means that zend_ast_export must be functional, which is not given when the AST is broken so that PHP is unable to handle it.

The included gdb script is capable of pretty-printing the AST. I suggest debugging this situation with gdb.

[iluuu1994]

I agree with Tim. Use gdb, we have print support for AST nodes.

> p *ast
$2 = ((zend_ast*)0x7ffff3877090) = {kind = ZEND_AST_ECHO, attr = 0, lineno = 1, child[0] = ((zend_ast_zval*)0x7ffff384f038) = {kind = ZEND_AST_ZVAL, attr = 0, val = ((zval*) 0x7ffff384f040) "Hello world!"}}

It's not the most readable, but it gets the job done.

[xepozz]

What if I don't use the dbg?
Actually, it's just a tip for developers while doing tests.

@iluuu1994 is there the same tip for lldb?

[TimWolla]

It's not the most readable, but it gets the job done.

FWIW: set print pretty on prints this multi-line.

[iluuu1994]

No, but gdb works on mac too.