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authorAkinori Ito <aito@eie.yz.yamagata-u.ac.jp>2001-11-08 05:14:08 +0000
committerAkinori Ito <aito@eie.yz.yamagata-u.ac.jp>2001-11-08 05:14:08 +0000
commit68a07bf03b7624c9924065cce9ffa45497225834 (patch)
treec2adb06a909a8594445e4a3f8587c4bad46e3ecd /gc/include/gc_inl.h
downloadw3m-68a07bf03b7624c9924065cce9ffa45497225834.tar.gz
w3m-68a07bf03b7624c9924065cce9ffa45497225834.zip
Initial revision
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+/*
+ * Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers
+ * Copyright (c) 1991-1995 by Xerox Corporation. All rights reserved.
+ *
+ * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
+ * OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
+ *
+ * Permission is hereby granted to use or copy this program
+ * for any purpose, provided the above notices are retained on all copies.
+ * Permission to modify the code and to distribute modified code is granted,
+ * provided the above notices are retained, and a notice that the code was
+ * modified is included with the above copyright notice.
+ */
+/* Boehm, October 3, 1995 2:07 pm PDT */
+
+# ifndef GC_PRIVATE_H
+# include "private/gc_priv.h"
+# endif
+
+/* USE OF THIS FILE IS NOT RECOMMENDED unless the collector has been */
+/* compiled without -DALL_INTERIOR_POINTERS or with */
+/* -DDONT_ADD_BYTE_AT_END, or the specified size includes a pointerfree */
+/* word at the end. In the standard collector configuration, */
+/* the final word of each object may not be scanned. */
+/* This is most useful for compilers that generate C. */
+/* Manual use is hereby discouraged. */
+
+/* Allocate n words (NOT BYTES). X is made to point to the result. */
+/* It is assumed that n < MAXOBJSZ, and */
+/* that n > 0. On machines requiring double word alignment of some */
+/* data, we also assume that n is 1 or even. This bypasses the */
+/* MERGE_SIZES mechanism. In order to minimize the number of distinct */
+/* free lists that are maintained, the caller should ensure that a */
+/* small number of distinct values of n are used. (The MERGE_SIZES */
+/* mechanism normally does this by ensuring that only the leading three */
+/* bits of n may be nonzero. See misc.c for details.) We really */
+/* recommend this only in cases in which n is a constant, and no */
+/* locking is required. */
+/* In that case it may allow the compiler to perform substantial */
+/* additional optimizations. */
+# define GC_MALLOC_WORDS(result,n) \
+{ \
+ register ptr_t op; \
+ register ptr_t *opp; \
+ DCL_LOCK_STATE; \
+ \
+ opp = &(GC_objfreelist[n]); \
+ FASTLOCK(); \
+ if( !FASTLOCK_SUCCEEDED() || (op = *opp) == 0 ) { \
+ FASTUNLOCK(); \
+ (result) = GC_generic_malloc_words_small((n), NORMAL); \
+ } else { \
+ *opp = obj_link(op); \
+ obj_link(op) = 0; \
+ GC_words_allocd += (n); \
+ FASTUNLOCK(); \
+ (result) = (GC_PTR) op; \
+ } \
+}
+
+
+/* The same for atomic objects: */
+# define GC_MALLOC_ATOMIC_WORDS(result,n) \
+{ \
+ register ptr_t op; \
+ register ptr_t *opp; \
+ DCL_LOCK_STATE; \
+ \
+ opp = &(GC_aobjfreelist[n]); \
+ FASTLOCK(); \
+ if( !FASTLOCK_SUCCEEDED() || (op = *opp) == 0 ) { \
+ FASTUNLOCK(); \
+ (result) = GC_generic_malloc_words_small((n), PTRFREE); \
+ } else { \
+ *opp = obj_link(op); \
+ obj_link(op) = 0; \
+ GC_words_allocd += (n); \
+ FASTUNLOCK(); \
+ (result) = (GC_PTR) op; \
+ } \
+}
+
+/* And once more for two word initialized objects: */
+# define GC_CONS(result, first, second) \
+{ \
+ register ptr_t op; \
+ register ptr_t *opp; \
+ DCL_LOCK_STATE; \
+ \
+ opp = &(GC_objfreelist[2]); \
+ FASTLOCK(); \
+ if( !FASTLOCK_SUCCEEDED() || (op = *opp) == 0 ) { \
+ FASTUNLOCK(); \
+ op = GC_generic_malloc_words_small(2, NORMAL); \
+ } else { \
+ *opp = obj_link(op); \
+ GC_words_allocd += 2; \
+ FASTUNLOCK(); \
+ } \
+ ((word *)op)[0] = (word)(first); \
+ ((word *)op)[1] = (word)(second); \
+ (result) = (GC_PTR) op; \
+}