difference between this and this@entry?

Question

I've recently started to use Eclipse-CDT and was curious about 'this' and 'this@entry' in the variables window in the debugging perspective. They both have the same memory address and look identical but then why include both? Is 'this@entry' meant to represent the state of 'this' at some breakpoint within a function? Do the values represented under 'this@entry' go out of scope, so to speak, and update 'this' when the function returns?

team1,2 and currentMatch are global variables to the class I am debugging, and the breakpoints are in a member function of that class.

Answer 1

The @entry form refers to the value of the parameter when the function was entered. This isn't always available, but sometimes it is -- there is a DWARF extension for it, and GCC emits this when possible.

There's some information here:

https://sourceware.org/gdb/onlinedocs/gdb/Variables.html

IIRC in gdb's CLI we decided on a format that only shows "@entry" in backtraces when it differs from the current value. But MI (what Eclipse uses) is different and from what you say it seems to always show it.