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tree-core: clarify clobber comments

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It came up on the mailing list that OBJECT_BEGIN/END are described as
marking object lifetime, but mark the beginning of the constructor and end
of the destructor, whereas the C++ notion of lifetime is between the end of
the constructor and beginning of the destructor.  So let's fix the comments.

gcc/ChangeLog:

	* tree-core.h (enum clobber_kind): Clarify CLOBBER_OBJECT_*
	comments.
This commit is contained in:
Jason Merrill 2024-02-22 10:06:27 +00:00
parent 6dbf0d252f
commit efab88888c
1 changed files with 4 additions and 2 deletions
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6
gcc/tree-core.h
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@ -993,9 +993,11 @@ enum clobber_kind {
CLOBBER_UNDEF,
/* Beginning of storage duration, e.g. malloc. */
CLOBBER_STORAGE_BEGIN,
/* Beginning of object lifetime, e.g. C++ constructor. */
/* Beginning of object data, e.g. start of C++ constructor. This differs
from C++ 'lifetime', which starts when initialization is complete; a
clobber there would discard the initialization. */
CLOBBER_OBJECT_BEGIN,
/* End of object lifetime, e.g. C++ destructor. */
/* End of object data, e.g. end of C++ destructor. */
CLOBBER_OBJECT_END,
/* End of storage duration, e.g. free. */
CLOBBER_STORAGE_END,