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Don't steal references in the gdb Python code

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Some Python APIs steal references from their caller, and the refcount
checker supports this via an attribute.

However, in gdb with C++ we have a better idiom available: we can use
std::move on a gdbpy_ref<> instead.  This makes the semantics obvious
at the point of call, and is safer at runtime as well, because the
callee's gdbpy_ref<> will be emptied.

This patch changes the reference-stealing code in gdb to use rvalue
references instead.

Tested on x86-64 Fedora 28.

gdb/ChangeLog
2018-09-16  Tom Tromey  <tom@tromey.com>

	* python/python-internal.h (CPYCHECKER_STEALS_REFERENCE_TO_ARG):
	Remove.
	* python/py-varobj.c (py_varobj_iter_ctor): Change pyiter to
	rvalue reference.  Remove CPYCHECKER_STEALS_REFERENCE_TO_ARG.
	(py_varobj_iter_new): Likewise.
	(py_varobj_get_iterator): Use gdbpy_ref.
This commit is contained in:
Tom Tromey 2018-09-16 07:32:23 -06:00
parent 4a137fec2e
commit 1a3389079d
3 changed files with 17 additions and 16 deletions
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7
gdb/python/python-internal.h
View file

@ -38,13 +38,6 @@
#define CPYCHECKER_TYPE_OBJECT_FOR_TYPEDEF(ARG)
#endif
#ifdef WITH_CPYCHECKER_STEALS_REFERENCE_TO_ARG_ATTRIBUTE
#define CPYCHECKER_STEALS_REFERENCE_TO_ARG(n) \
__attribute__ ((cpychecker_steals_reference_to_arg (n)))
#else
#define CPYCHECKER_STEALS_REFERENCE_TO_ARG(n)
#endif
#ifdef WITH_CPYCHECKER_SETS_EXCEPTION_ATTRIBUTE
#define CPYCHECKER_SETS_EXCEPTION __attribute__ ((cpychecker_sets_exception))
#else