diff options
Diffstat (limited to 'gcc/rtl.c')
| -rw-r--r-- | gcc/rtl.c | 38 |
1 files changed, 37 insertions, 1 deletions
@@ -1,5 +1,6 @@ /* Allocate and read RTL for GNU C Compiler. - Copyright (C) 1987, 1988, 1991, 1994, 1997, 1998 Free Software Foundation, Inc. + Copyright (C) 1987, 1988, 1991, 1994, 1997, 1998, 1999 + Free Software Foundation, Inc. This file is part of GNU CC. @@ -309,6 +310,41 @@ rtx_alloc (code) return rt; } +/* Like the above, but allocate based only on the length. This is called + by the routines built into genrtl.c. */ + +rtx +obstack_alloc_rtx (length) + int length; +{ + rtx rt; + register struct obstack *ob = rtl_obstack; + + /* This function is called more than any other in GCC, + so we manipulate the obstack directly. + + Even though rtx objects are word aligned, we may be sharing an obstack + with tree nodes, which may have to be double-word aligned. So align + our length to the alignment mask in the obstack. */ + + length = (length + ob->alignment_mask) & ~ ob->alignment_mask; + + if (ob->chunk_limit - ob->next_free < length) + _obstack_newchunk (ob, length); + + rt = (rtx) ob->object_base; + ob->next_free += length; + ob->object_base = ob->next_free; + + /* We want to clear everything up to the FLD array. Normally, + this is one int, but we don't want to assume that and it + isn't very portable anyway; this is. */ + + memset (rt, 0, sizeof (struct rtx_def) - sizeof (rtunion)); + + return rt; +} + /* Free the rtx X and all RTL allocated since X. */ void |