0001752: Use a stack pool to manage stack entries instead of allocating and deallocating entries

ID	Project	Category	View Status	Date Submitted	Last Update
0001752	Xdebug	Uncategorized	public	2020-02-28 08:19	2020-10-14 15:02

Reporter	barel	Assigned To
Priority	normal	Severity	feature	Reproducibility	always
Status	closed	Resolution	fixed
Target Version	3.0dev	Fixed in Version	3.0.0beta1

Summary	0001752: Use a stack pool to manage stack entries instead of allocating and deallocating entries
Description	The maximum number of stack entries is known as this will be equal to max_nesting_level. And the use of these entries follows a very logical path depending on the stack level. So instead of allocating and deallocating memory every time we enter or leave a function we could allocate a global pool of stack entries and use that. This should improve the performance of Xdebug Obviously this is only possible if max_nesting_level is not set to -1 or a very large value
Tags	performance

Operating System
PHP Version	7.4.0-7.4.4

barel 2020-03-02 09:25 reporter ~0005264	Instead of using a pool, we could use a vector (a dynamically sized array) of stack entries, removing the need for a linked list

derick 2020-08-12 16:14 administrator ~0005442	I made this change some weeks ago.