From: Stefan Monnier <monnier@iro.umontreal.ca>
Date: Sat, 8 Apr 2006 14:34:31 +0000 (+0000)
Subject: (PSEUDOVECTOR_SIZE_MASK): Expand docstring.
X-Git-Tag: emacs-pretest-22.0.90~3269
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=df631196ed34b92f9b321db3fe0b1a6ae52288c0;p=emacs.git

(PSEUDOVECTOR_SIZE_MASK): Expand docstring.
---

diff --git a/src/lisp.h b/src/lisp.h
index 56b5645b9dc..63a17801a3d 100644
--- a/src/lisp.h
+++ b/src/lisp.h
@@ -297,7 +297,11 @@ enum pvec_type
 #endif
 };
 
-/* For convenience, we also store the number of elements in these bits.  */
+/* For convenience, we also store the number of elements in these bits.
+   Note that this size is not necessarily the memory-footprint size, but
+   only the number of Lisp_Object fields (that need to be traced by the GC).
+   The distinction is used e.g. by Lisp_Process which places extra
+   non-Lisp_Object fields at the end of the structure.  */
 #define PSEUDOVECTOR_SIZE_MASK 0x1ff
 
 /* Number of bits to put in each character in the internal representation