analyzer: add event kinds for special control flow [PR122544]

analyzer: add event kinds for special control flow [PR122544]

The SARIF 3.38.8 "kinds" property has some verbs for expressing
control flow, but is missing some of the awkward special cases.

The spec says "If none of these values are appropriate, a SARIF
producer MAY use any value."

This patch adds the following new values:

* "throw" for throwing an exception
* "catch" for catching an exception
* "unwind" for unwinding stack frame(s) during exception-handling
* "setjmp" for calls to setjmp
* "longjmp" for calls to longjmp that rewind the program counter/stack
to the location of a previous setjmp call

gcc/analyzer/ChangeLog:
	PR analyzer/122544
	* checker-event.cc (catch_cfg_edge_event::get_meaning): New.
	(setjmp_event::get_meaning): New.
	(rewind_event::get_meaning): New.
	(throw_event::get_meaning): New.
	(unwind_event::get_meaning): New.
	* checker-event.h (catch_cfg_edge_event::get_meaning): New decl.
	(setjmp_event::get_meaning): New decl.
	(rewind_event::get_meaning): New decl.
	(throw_event::get_meaning): New decl.
	(unwind_event::get_meaning): New decl.

gcc/ChangeLog:
	PR analyzer/122544
	* diagnostics/paths.cc (event::meaning::maybe_get_verb_str):
	Handle the new verbs.
	* diagnostics/paths.h (event::meaning::verb): Add new values
	for special control flow operations.
	(event::meaning::meaning): Add ctor taking just a verb.

gcc/testsuite/ChangeLog:
	PR analyzer/122544
	* g++.dg/analyzer/exception-path-1-sarif.py: New test script.
	* g++.dg/analyzer/exception-path-1.C: Add SARIF output, and use
	the above to check it.
	* g++.dg/analyzer/exception-path-unwind-multiple-2-sarif.py: New
	test script.
	* g++.dg/analyzer/exception-path-unwind-multiple-2.C: Add SARIF
	output, and use the above to check it.
	* gcc.dg/analyzer/setjmp-3-sarif.py: New test script.
	* gcc.dg/analyzer/setjmp-3.c: Add SARIF output, and use
	the above to check it.

Signed-off-by: David Malcolm <dmalcolm@redhat.com>