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fa94e3a95d
* gc_priv.h (GC_test_and_set): Implementation for Linux PPC from Franz Sirl <Franz.Sirl-kernel@lauterbach.com>. From-SVN: r28480
1615 lines
55 KiB
C
1615 lines
55 KiB
C
/*
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* Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers
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* Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.
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*
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* THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
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* OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
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*
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* Permission is hereby granted to use or copy this program
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* for any purpose, provided the above notices are retained on all copies.
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* Permission to modify the code and to distribute modified code is granted,
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* provided the above notices are retained, and a notice that the code was
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* modified is included with the above copyright notice.
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*/
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/* Boehm, February 16, 1996 2:30 pm PST */
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# ifndef GC_PRIVATE_H
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# define GC_PRIVATE_H
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#if defined(mips) && defined(SYSTYPE_BSD) && defined(sony_news)
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/* sony RISC NEWS, NEWSOS 4 */
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# define BSD_TIME
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/* typedef long ptrdiff_t; -- necessary on some really old systems */
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#endif
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#if defined(mips) && defined(SYSTYPE_BSD43)
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/* MIPS RISCOS 4 */
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# define BSD_TIME
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#endif
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#ifdef BSD_TIME
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# include <sys/types.h>
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# include <sys/time.h>
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# include <sys/resource.h>
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#endif /* BSD_TIME */
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# ifndef GC_H
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# include "gc.h"
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# endif
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typedef GC_word word;
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typedef GC_signed_word signed_word;
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# ifndef CONFIG_H
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# include "config.h"
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# endif
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# ifndef HEADERS_H
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# include "gc_hdrs.h"
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# endif
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typedef int GC_bool;
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# define TRUE 1
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# define FALSE 0
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typedef char * ptr_t; /* A generic pointer to which we can add */
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/* byte displacements. */
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/* Preferably identical to caddr_t, if it */
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/* exists. */
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#if defined(__STDC__)
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# include <stdlib.h>
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# if !(defined( sony_news ) )
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# include <stddef.h>
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# endif
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# define VOLATILE volatile
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# define CONST const
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#else
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# ifdef MSWIN32
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# include <stdlib.h>
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# endif
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# define VOLATILE
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# define CONST
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#endif
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#ifdef AMIGA
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# define GC_FAR __far
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#else
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# define GC_FAR
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#endif
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/*********************************/
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/* */
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/* Definitions for conservative */
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/* collector */
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/* */
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/*********************************/
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/*********************************/
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/* */
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/* Easily changeable parameters */
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/* */
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/*********************************/
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#define STUBBORN_ALLOC /* Define stubborn allocation primitives */
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#if defined(SRC_M3) || defined(SMALL_CONFIG)
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# undef STUBBORN_ALLOC
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#endif
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/* #define ALL_INTERIOR_POINTERS */
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/* Forces all pointers into the interior of an */
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/* object to be considered valid. Also causes the */
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/* sizes of all objects to be inflated by at least */
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/* one byte. This should suffice to guarantee */
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/* that in the presence of a compiler that does */
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/* not perform garbage-collector-unsafe */
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/* optimizations, all portable, strictly ANSI */
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/* conforming C programs should be safely usable */
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/* with malloc replaced by GC_malloc and free */
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/* calls removed. There are several disadvantages: */
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/* 1. There are probably no interesting, portable, */
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/* strictly ANSI conforming C programs. */
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/* 2. This option makes it hard for the collector */
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/* to allocate space that is not ``pointed to'' */
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/* by integers, etc. Under SunOS 4.X with a */
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/* statically linked libc, we empiricaly */
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/* observed that it would be difficult to */
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/* allocate individual objects larger than 100K. */
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/* Even if only smaller objects are allocated, */
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/* more swap space is likely to be needed. */
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/* Fortunately, much of this will never be */
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/* touched. */
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/* If you can easily avoid using this option, do. */
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/* If not, try to keep individual objects small. */
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#define PRINTSTATS /* Print garbage collection statistics */
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/* For less verbose output, undefine in reclaim.c */
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#define PRINTTIMES /* Print the amount of time consumed by each garbage */
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/* collection. */
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#define PRINTBLOCKS /* Print object sizes associated with heap blocks, */
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/* whether the objects are atomic or composite, and */
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/* whether or not the block was found to be empty */
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/* during the reclaim phase. Typically generates */
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/* about one screenful per garbage collection. */
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#undef PRINTBLOCKS
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#ifdef SILENT
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# ifdef PRINTSTATS
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# undef PRINTSTATS
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# endif
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# ifdef PRINTTIMES
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# undef PRINTTIMES
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# endif
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# ifdef PRINTNBLOCKS
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# undef PRINTNBLOCKS
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# endif
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#endif
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#if defined(PRINTSTATS) && !defined(GATHERSTATS)
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# define GATHERSTATS
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#endif
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#ifdef FINALIZE_ON_DEMAND
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# define GC_INVOKE_FINALIZERS()
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#else
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# define GC_INVOKE_FINALIZERS() (void)GC_invoke_finalizers()
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#endif
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#define MERGE_SIZES /* Round up some object sizes, so that fewer distinct */
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/* free lists are actually maintained. This applies */
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/* only to the top level routines in misc.c, not to */
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/* user generated code that calls GC_allocobj and */
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/* GC_allocaobj directly. */
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/* Slows down average programs slightly. May however */
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/* substantially reduce fragmentation if allocation */
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/* request sizes are widely scattered. */
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/* May save significant amounts of space for obj_map */
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/* entries. */
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#ifndef OLD_BLOCK_ALLOC
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/* Macros controlling large block allocation strategy. */
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# define EXACT_FIRST /* Make a complete pass through the large object */
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/* free list before splitting a block */
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# define PRESERVE_LAST /* Do not divide last allocated heap segment */
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/* unless we would otherwise need to expand the */
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/* heap. */
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#endif
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/* ALIGN_DOUBLE requires MERGE_SIZES at present. */
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# if defined(ALIGN_DOUBLE) && !defined(MERGE_SIZES)
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# define MERGE_SIZES
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# endif
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#if defined(ALL_INTERIOR_POINTERS) && !defined(DONT_ADD_BYTE_AT_END)
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# define ADD_BYTE_AT_END
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#endif
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# ifndef LARGE_CONFIG
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# define MINHINCR 16 /* Minimum heap increment, in blocks of HBLKSIZE */
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/* Must be multiple of largest page size. */
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# define MAXHINCR 512 /* Maximum heap increment, in blocks */
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# else
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# define MINHINCR 64
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# define MAXHINCR 4096
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# endif
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# define TIME_LIMIT 50 /* We try to keep pause times from exceeding */
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/* this by much. In milliseconds. */
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# define BL_LIMIT GC_black_list_spacing
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/* If we need a block of N bytes, and we have */
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/* a block of N + BL_LIMIT bytes available, */
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/* and N > BL_LIMIT, */
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/* but all possible positions in it are */
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/* blacklisted, we just use it anyway (and */
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/* print a warning, if warnings are enabled). */
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/* This risks subsequently leaking the block */
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/* due to a false reference. But not using */
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/* the block risks unreasonable immediate */
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/* heap growth. */
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/*********************************/
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/* */
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/* Stack saving for debugging */
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/* */
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/*********************************/
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#ifdef SAVE_CALL_CHAIN
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/*
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* Number of frames and arguments to save in objects allocated by
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* debugging allocator.
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*/
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# define NFRAMES 6 /* Number of frames to save. Even for */
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/* alignment reasons. */
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# define NARGS 2 /* Mumber of arguments to save for each call. */
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# define NEED_CALLINFO
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/* Fill in the pc and argument information for up to NFRAMES of my */
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/* callers. Ignore my frame and my callers frame. */
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void GC_save_callers (/* struct callinfo info[NFRAMES] */);
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void GC_print_callers (/* struct callinfo info[NFRAMES] */);
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#else
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# ifdef GC_ADD_CALLER
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# define NFRAMES 1
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# define NARGS 0
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# define NEED_CALLINFO
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# endif
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#endif
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#ifdef NEED_CALLINFO
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struct callinfo {
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word ci_pc;
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# if NARGS > 0
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word ci_arg[NARGS]; /* bit-wise complement to avoid retention */
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# endif
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# if defined(ALIGN_DOUBLE) && (NFRAMES * (NARGS + 1)) % 2 == 1
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/* Likely alignment problem. */
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word ci_dummy;
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# endif
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};
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#endif
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/*********************************/
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/* */
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/* OS interface routines */
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/* */
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/*********************************/
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#ifdef BSD_TIME
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# undef CLOCK_TYPE
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# undef GET_TIME
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# undef MS_TIME_DIFF
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# define CLOCK_TYPE struct timeval
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# define GET_TIME(x) { struct rusage rusage; \
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getrusage (RUSAGE_SELF, &rusage); \
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x = rusage.ru_utime; }
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# define MS_TIME_DIFF(a,b) ((double) (a.tv_sec - b.tv_sec) * 1000.0 \
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+ (double) (a.tv_usec - b.tv_usec) / 1000.0)
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#else /* !BSD_TIME */
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# include <time.h>
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# if !defined(__STDC__) && defined(SPARC) && defined(SUNOS4)
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clock_t clock(); /* Not in time.h, where it belongs */
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# endif
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# if defined(FREEBSD) && !defined(CLOCKS_PER_SEC)
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# include <machine/limits.h>
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# define CLOCKS_PER_SEC CLK_TCK
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# endif
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# if !defined(CLOCKS_PER_SEC)
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# define CLOCKS_PER_SEC 1000000
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/*
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* This is technically a bug in the implementation. ANSI requires that
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* CLOCKS_PER_SEC be defined. But at least under SunOS4.1.1, it isn't.
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* Also note that the combination of ANSI C and POSIX is incredibly gross
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* here. The type clock_t is used by both clock() and times(). But on
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* some machines these use different notions of a clock tick, CLOCKS_PER_SEC
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* seems to apply only to clock. Hence we use it here. On many machines,
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* including SunOS, clock actually uses units of microseconds (which are
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* not really clock ticks).
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*/
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# endif
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# define CLOCK_TYPE clock_t
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# define GET_TIME(x) x = clock()
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# define MS_TIME_DIFF(a,b) ((unsigned long) \
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(1000.0*(double)((a)-(b))/(double)CLOCKS_PER_SEC))
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#endif /* !BSD_TIME */
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/* We use bzero and bcopy internally. They may not be available. */
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# if defined(SPARC) && defined(SUNOS4)
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# define BCOPY_EXISTS
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# endif
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# if defined(M68K) && defined(AMIGA)
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# define BCOPY_EXISTS
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# endif
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# if defined(M68K) && defined(NEXT)
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# define BCOPY_EXISTS
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# endif
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# if defined(VAX)
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# define BCOPY_EXISTS
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# endif
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# if defined(AMIGA)
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# include <string.h>
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# define BCOPY_EXISTS
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# endif
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# ifndef BCOPY_EXISTS
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# include <string.h>
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# define BCOPY(x,y,n) memcpy(y, x, (size_t)(n))
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# define BZERO(x,n) memset(x, 0, (size_t)(n))
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# else
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# define BCOPY(x,y,n) bcopy((char *)(x),(char *)(y),(int)(n))
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# define BZERO(x,n) bzero((char *)(x),(int)(n))
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# endif
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/* HBLKSIZE aligned allocation. 0 is taken to mean failure */
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/* space is assumed to be cleared. */
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/* In the case os USE_MMAP, the argument must also be a */
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/* physical page size. */
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# ifdef PCR
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char * real_malloc();
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# define GET_MEM(bytes) HBLKPTR(real_malloc((size_t)bytes + GC_page_size) \
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+ GC_page_size-1)
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# else
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# ifdef OS2
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void * os2_alloc(size_t bytes);
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# define GET_MEM(bytes) HBLKPTR((ptr_t)os2_alloc((size_t)bytes \
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+ GC_page_size) \
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+ GC_page_size-1)
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# else
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# if defined(AMIGA) || defined(NEXT) || defined(DOS4GW)
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# define GET_MEM(bytes) HBLKPTR((size_t) \
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calloc(1, (size_t)bytes + GC_page_size) \
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+ GC_page_size-1)
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# else
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# ifdef MSWIN32
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extern ptr_t GC_win32_get_mem();
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# define GET_MEM(bytes) (struct hblk *)GC_win32_get_mem(bytes)
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# else
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# ifdef MACOS
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# if defined(USE_TEMPORARY_MEMORY)
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extern Ptr GC_MacTemporaryNewPtr(size_t size,
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Boolean clearMemory);
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# define GET_MEM(bytes) HBLKPTR( \
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GC_MacTemporaryNewPtr(bytes + GC_page_size, true) \
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+ GC_page_size-1)
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# else
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# define GET_MEM(bytes) HBLKPTR( \
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NewPtrClear(bytes + GC_page_size) + GC_page_size-1)
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# endif
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# else
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extern ptr_t GC_unix_get_mem();
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# define GET_MEM(bytes) (struct hblk *)GC_unix_get_mem(bytes)
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# endif
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# endif
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# endif
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# endif
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# endif
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/*
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* Mutual exclusion between allocator/collector routines.
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* Needed if there is more than one allocator thread.
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* FASTLOCK() is assumed to try to acquire the lock in a cheap and
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* dirty way that is acceptable for a few instructions, e.g. by
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* inhibiting preemption. This is assumed to have succeeded only
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* if a subsequent call to FASTLOCK_SUCCEEDED() returns TRUE.
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* FASTUNLOCK() is called whether or not FASTLOCK_SUCCEEDED().
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* If signals cannot be tolerated with the FASTLOCK held, then
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* FASTLOCK should disable signals. The code executed under
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* FASTLOCK is otherwise immune to interruption, provided it is
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* not restarted.
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* DCL_LOCK_STATE declares any local variables needed by LOCK and UNLOCK
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* and/or DISABLE_SIGNALS and ENABLE_SIGNALS and/or FASTLOCK.
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* (There is currently no equivalent for FASTLOCK.)
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*/
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# ifdef THREADS
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# ifdef PCR_OBSOLETE /* Faster, but broken with multiple lwp's */
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# include "th/PCR_Th.h"
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# include "th/PCR_ThCrSec.h"
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extern struct PCR_Th_MLRep GC_allocate_ml;
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# define DCL_LOCK_STATE PCR_sigset_t GC_old_sig_mask
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# define LOCK() PCR_Th_ML_Acquire(&GC_allocate_ml)
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# define UNLOCK() PCR_Th_ML_Release(&GC_allocate_ml)
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# define FASTLOCK() PCR_ThCrSec_EnterSys()
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/* Here we cheat (a lot): */
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# define FASTLOCK_SUCCEEDED() (*(int *)(&GC_allocate_ml) == 0)
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/* TRUE if nobody currently holds the lock */
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# define FASTUNLOCK() PCR_ThCrSec_ExitSys()
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# endif
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# ifdef PCR
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# include <base/PCR_Base.h>
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# include <th/PCR_Th.h>
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extern PCR_Th_ML GC_allocate_ml;
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# define DCL_LOCK_STATE \
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PCR_ERes GC_fastLockRes; PCR_sigset_t GC_old_sig_mask
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# define LOCK() PCR_Th_ML_Acquire(&GC_allocate_ml)
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# define UNLOCK() PCR_Th_ML_Release(&GC_allocate_ml)
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# define FASTLOCK() (GC_fastLockRes = PCR_Th_ML_Try(&GC_allocate_ml))
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# define FASTLOCK_SUCCEEDED() (GC_fastLockRes == PCR_ERes_okay)
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# define FASTUNLOCK() {\
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if( FASTLOCK_SUCCEEDED() ) PCR_Th_ML_Release(&GC_allocate_ml); }
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# endif
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# ifdef SRC_M3
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extern word RT0u__inCritical;
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# define LOCK() RT0u__inCritical++
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# define UNLOCK() RT0u__inCritical--
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# endif
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# ifdef SOLARIS_THREADS
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# include <thread.h>
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# include <signal.h>
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extern mutex_t GC_allocate_ml;
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# define LOCK() mutex_lock(&GC_allocate_ml);
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# define UNLOCK() mutex_unlock(&GC_allocate_ml);
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# endif
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# ifdef LINUX_THREADS
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# include <pthread.h>
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# ifdef __i386__
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inline static int GC_test_and_set(volatile unsigned int *addr) {
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int oldval;
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/* Note: the "xchg" instruction does not need a "lock" prefix */
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__asm__ __volatile__("xchgl %0, %1"
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: "=r"(oldval), "=m"(*(addr))
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: "0"(1), "m"(*(addr)));
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return oldval;
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}
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inline static void GC_clear(volatile unsigned int *addr) {
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*(addr) = 0;
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}
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# elif defined(__alpha__)
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inline static int GC_test_and_set(volatile unsigned int *addr) {
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long oldval, temp;
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__asm__ __volatile__(
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"1:\tldl_l %0,%3\n"
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"\tbne %0,2f\n"
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"\tor $31,1,%1\n"
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"\tstl_c %1,%2\n"
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"\tbeq %1,1b\n"
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"2:\tmb\n"
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: "=&r"(oldval), "=&r"(temp), "=m"(*(addr))
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: "m"(*(addr))
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: "memory");
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return (int)oldval;
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}
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inline static void GC_clear(volatile unsigned int *addr) {
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__asm__ __volatile__("mb": : :"memory");
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*(addr) = 0;
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}
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# elif defined(__powerpc__)
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inline static int GC_test_and_set(volatile unsigned int *addr) {
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int ret, oldval=0, newval=1;
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__asm__ __volatile__("sync" : : : "memory");
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__asm__ __volatile__(
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"0: lwarx %0,0,%1 ;"
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|
" xor. %0,%3,%0;"
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" bne 1f;"
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" stwcx. %2,0,%1;"
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" bne- 0b;"
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"1: "
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: "=&r"(ret)
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: "r"(addr), "r"(newval), "r"(oldval)
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: "cr0", "memory");
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__asm__ __volatile__("sync" : : : "memory");
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return ret == 0;
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}
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inline static void GC_clear(volatile unsigned int *addr) {
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__asm__ __volatile__("sync": : :"memory");
|
|
*(addr) = 0;
|
|
}
|
|
|
|
# else
|
|
-- > Need implementation of GC_test_and_set()
|
|
# endif
|
|
|
|
extern volatile unsigned int GC_allocate_lock;
|
|
/* This is not a mutex because mutexes that obey the (optional) */
|
|
/* POSIX scheduling rules are subject to convoys in high contention */
|
|
/* applications. This is basically a spin lock. */
|
|
extern pthread_t GC_lock_holder;
|
|
extern void GC_lock(void);
|
|
/* Allocation lock holder. Only set if acquired by client through */
|
|
/* GC_call_with_alloc_lock. */
|
|
# define SET_LOCK_HOLDER() GC_lock_holder = pthread_self()
|
|
# define NO_THREAD (pthread_t)(-1)
|
|
# define UNSET_LOCK_HOLDER() GC_lock_holder = NO_THREAD
|
|
# define I_HOLD_LOCK() (pthread_equal(GC_lock_holder, pthread_self()))
|
|
# ifdef UNDEFINED
|
|
# define LOCK() pthread_mutex_lock(&GC_allocate_ml)
|
|
# define UNLOCK() pthread_mutex_unlock(&GC_allocate_ml)
|
|
# else
|
|
# define LOCK() \
|
|
{ if (GC_test_and_set(&GC_allocate_lock)) GC_lock(); }
|
|
# define UNLOCK() \
|
|
GC_clear(&GC_allocate_lock)
|
|
# endif
|
|
extern GC_bool GC_collecting;
|
|
# define ENTER_GC() \
|
|
{ \
|
|
GC_collecting = 1; \
|
|
}
|
|
# define EXIT_GC() GC_collecting = 0;
|
|
# endif /* LINUX_THREADS */
|
|
# ifdef IRIX_THREADS
|
|
# include <pthread.h>
|
|
# include <mutex.h>
|
|
|
|
# if __mips < 3 || !(defined (_ABIN32) || defined(_ABI64))
|
|
# define GC_test_and_set(addr, v) test_and_set(addr,v)
|
|
# else
|
|
# define GC_test_and_set(addr, v) __test_and_set(addr,v)
|
|
# endif
|
|
extern unsigned long GC_allocate_lock;
|
|
/* This is not a mutex because mutexes that obey the (optional) */
|
|
/* POSIX scheduling rules are subject to convoys in high contention */
|
|
/* applications. This is basically a spin lock. */
|
|
extern pthread_t GC_lock_holder;
|
|
extern void GC_lock(void);
|
|
/* Allocation lock holder. Only set if acquired by client through */
|
|
/* GC_call_with_alloc_lock. */
|
|
# define SET_LOCK_HOLDER() GC_lock_holder = pthread_self()
|
|
# define NO_THREAD (pthread_t)(-1)
|
|
# define UNSET_LOCK_HOLDER() GC_lock_holder = NO_THREAD
|
|
# define I_HOLD_LOCK() (pthread_equal(GC_lock_holder, pthread_self()))
|
|
# ifdef UNDEFINED
|
|
# define LOCK() pthread_mutex_lock(&GC_allocate_ml)
|
|
# define UNLOCK() pthread_mutex_unlock(&GC_allocate_ml)
|
|
# else
|
|
# define LOCK() { if (GC_test_and_set(&GC_allocate_lock, 1)) GC_lock(); }
|
|
# if __mips >= 3 && (defined (_ABIN32) || defined(_ABI64))
|
|
# define UNLOCK() __lock_release(&GC_allocate_lock)
|
|
# else
|
|
# define UNLOCK() GC_allocate_lock = 0
|
|
# endif
|
|
# endif
|
|
extern GC_bool GC_collecting;
|
|
# define ENTER_GC() \
|
|
{ \
|
|
GC_collecting = 1; \
|
|
}
|
|
# define EXIT_GC() GC_collecting = 0;
|
|
# endif /* IRIX_THREADS */
|
|
# ifdef WIN32_THREADS
|
|
# include <windows.h>
|
|
GC_API CRITICAL_SECTION GC_allocate_ml;
|
|
# define LOCK() EnterCriticalSection(&GC_allocate_ml);
|
|
# define UNLOCK() LeaveCriticalSection(&GC_allocate_ml);
|
|
# endif
|
|
# ifdef QUICK_THREADS
|
|
# define LOCK()
|
|
# define UNLOCK()
|
|
# endif
|
|
# ifndef SET_LOCK_HOLDER
|
|
# define SET_LOCK_HOLDER()
|
|
# define UNSET_LOCK_HOLDER()
|
|
# define I_HOLD_LOCK() FALSE
|
|
/* Used on platforms were locks can be reacquired, */
|
|
/* so it doesn't matter if we lie. */
|
|
# endif
|
|
# else
|
|
# define LOCK()
|
|
# define UNLOCK()
|
|
# endif
|
|
# ifndef SET_LOCK_HOLDER
|
|
# define SET_LOCK_HOLDER()
|
|
# define UNSET_LOCK_HOLDER()
|
|
# define I_HOLD_LOCK() FALSE
|
|
/* Used on platforms were locks can be reacquired, */
|
|
/* so it doesn't matter if we lie. */
|
|
# endif
|
|
# ifndef ENTER_GC
|
|
# define ENTER_GC()
|
|
# define EXIT_GC()
|
|
# endif
|
|
|
|
# ifndef DCL_LOCK_STATE
|
|
# define DCL_LOCK_STATE
|
|
# endif
|
|
# ifndef FASTLOCK
|
|
# define FASTLOCK() LOCK()
|
|
# define FASTLOCK_SUCCEEDED() TRUE
|
|
# define FASTUNLOCK() UNLOCK()
|
|
# endif
|
|
|
|
/* Delay any interrupts or signals that may abort this thread. Data */
|
|
/* structures are in a consistent state outside this pair of calls. */
|
|
/* ANSI C allows both to be empty (though the standard isn't very */
|
|
/* clear on that point). Standard malloc implementations are usually */
|
|
/* neither interruptable nor thread-safe, and thus correspond to */
|
|
/* empty definitions. */
|
|
# ifdef PCR
|
|
# define DISABLE_SIGNALS() \
|
|
PCR_Th_SetSigMask(PCR_allSigsBlocked,&GC_old_sig_mask)
|
|
# define ENABLE_SIGNALS() \
|
|
PCR_Th_SetSigMask(&GC_old_sig_mask, NIL)
|
|
# else
|
|
# if defined(SRC_M3) || defined(AMIGA) || defined(SOLARIS_THREADS) \
|
|
|| defined(MSWIN32) || defined(MACOS) || defined(DJGPP) \
|
|
|| defined(NO_SIGNALS) || defined(IRIX_THREADS) \
|
|
|| defined(LINUX_THREADS)
|
|
/* Also useful for debugging. */
|
|
/* Should probably use thr_sigsetmask for SOLARIS_THREADS. */
|
|
# define DISABLE_SIGNALS()
|
|
# define ENABLE_SIGNALS()
|
|
# else
|
|
# define DISABLE_SIGNALS() GC_disable_signals()
|
|
void GC_disable_signals();
|
|
# define ENABLE_SIGNALS() GC_enable_signals()
|
|
void GC_enable_signals();
|
|
# endif
|
|
# endif
|
|
|
|
/*
|
|
* Stop and restart mutator threads.
|
|
*/
|
|
# ifdef PCR
|
|
# include "th/PCR_ThCtl.h"
|
|
# define STOP_WORLD() \
|
|
PCR_ThCtl_SetExclusiveMode(PCR_ThCtl_ExclusiveMode_stopNormal, \
|
|
PCR_allSigsBlocked, \
|
|
PCR_waitForever)
|
|
# define START_WORLD() \
|
|
PCR_ThCtl_SetExclusiveMode(PCR_ThCtl_ExclusiveMode_null, \
|
|
PCR_allSigsBlocked, \
|
|
PCR_waitForever);
|
|
# else
|
|
# if defined(SOLARIS_THREADS) || defined(WIN32_THREADS) \
|
|
|| defined(IRIX_THREADS) || defined(LINUX_THREADS)
|
|
void GC_stop_world();
|
|
void GC_start_world();
|
|
# define STOP_WORLD() GC_stop_world()
|
|
# define START_WORLD() GC_start_world()
|
|
# else
|
|
# define STOP_WORLD()
|
|
# define START_WORLD()
|
|
# endif
|
|
# endif
|
|
|
|
/* Abandon ship */
|
|
# ifdef PCR
|
|
# define ABORT(s) PCR_Base_Panic(s)
|
|
# else
|
|
# ifdef SMALL_CONFIG
|
|
# define ABORT(msg) abort();
|
|
# else
|
|
GC_API void GC_abort();
|
|
# define ABORT(msg) GC_abort(msg);
|
|
# endif
|
|
# endif
|
|
|
|
/* Exit abnormally, but without making a mess (e.g. out of memory) */
|
|
# ifdef PCR
|
|
# define EXIT() PCR_Base_Exit(1,PCR_waitForever)
|
|
# else
|
|
# define EXIT() (void)exit(1)
|
|
# endif
|
|
|
|
/* Print warning message, e.g. almost out of memory. */
|
|
# define WARN(msg,arg) (*GC_current_warn_proc)(msg, (GC_word)(arg))
|
|
extern GC_warn_proc GC_current_warn_proc;
|
|
|
|
/*********************************/
|
|
/* */
|
|
/* Word-size-dependent defines */
|
|
/* */
|
|
/*********************************/
|
|
|
|
#if CPP_WORDSZ == 32
|
|
# define WORDS_TO_BYTES(x) ((x)<<2)
|
|
# define BYTES_TO_WORDS(x) ((x)>>2)
|
|
# define LOGWL ((word)5) /* log[2] of CPP_WORDSZ */
|
|
# define modWORDSZ(n) ((n) & 0x1f) /* n mod size of word */
|
|
# if ALIGNMENT != 4
|
|
# define UNALIGNED
|
|
# endif
|
|
#endif
|
|
|
|
#if CPP_WORDSZ == 64
|
|
# define WORDS_TO_BYTES(x) ((x)<<3)
|
|
# define BYTES_TO_WORDS(x) ((x)>>3)
|
|
# define LOGWL ((word)6) /* log[2] of CPP_WORDSZ */
|
|
# define modWORDSZ(n) ((n) & 0x3f) /* n mod size of word */
|
|
# if ALIGNMENT != 8
|
|
# define UNALIGNED
|
|
# endif
|
|
#endif
|
|
|
|
#define WORDSZ ((word)CPP_WORDSZ)
|
|
#define SIGNB ((word)1 << (WORDSZ-1))
|
|
#define BYTES_PER_WORD ((word)(sizeof (word)))
|
|
#define ONES ((word)(-1))
|
|
#define divWORDSZ(n) ((n) >> LOGWL) /* divide n by size of word */
|
|
|
|
/*********************/
|
|
/* */
|
|
/* Size Parameters */
|
|
/* */
|
|
/*********************/
|
|
|
|
/* heap block size, bytes. Should be power of 2 */
|
|
|
|
#ifndef HBLKSIZE
|
|
# ifdef SMALL_CONFIG
|
|
# define CPP_LOG_HBLKSIZE 10
|
|
# else
|
|
# if CPP_WORDSZ == 32
|
|
# define CPP_LOG_HBLKSIZE 12
|
|
# else
|
|
# define CPP_LOG_HBLKSIZE 13
|
|
# endif
|
|
# endif
|
|
#else
|
|
# if HBLKSIZE == 512
|
|
# define CPP_LOG_HBLKSIZE 9
|
|
# endif
|
|
# if HBLKSIZE == 1024
|
|
# define CPP_LOG_HBLKSIZE 10
|
|
# endif
|
|
# if HBLKSIZE == 2048
|
|
# define CPP_LOG_HBLKSIZE 11
|
|
# endif
|
|
# if HBLKSIZE == 4096
|
|
# define CPP_LOG_HBLKSIZE 12
|
|
# endif
|
|
# if HBLKSIZE == 8192
|
|
# define CPP_LOG_HBLKSIZE 13
|
|
# endif
|
|
# if HBLKSIZE == 16384
|
|
# define CPP_LOG_HBLKSIZE 14
|
|
# endif
|
|
# ifndef CPP_LOG_HBLKSIZE
|
|
--> fix HBLKSIZE
|
|
# endif
|
|
# undef HBLKSIZE
|
|
#endif
|
|
# define CPP_HBLKSIZE (1 << CPP_LOG_HBLKSIZE)
|
|
# define LOG_HBLKSIZE ((word)CPP_LOG_HBLKSIZE)
|
|
# define HBLKSIZE ((word)CPP_HBLKSIZE)
|
|
|
|
|
|
/* max size objects supported by freelist (larger objects may be */
|
|
/* allocated, but less efficiently) */
|
|
|
|
#define CPP_MAXOBJSZ BYTES_TO_WORDS(CPP_HBLKSIZE/2)
|
|
#define MAXOBJSZ ((word)CPP_MAXOBJSZ)
|
|
|
|
# define divHBLKSZ(n) ((n) >> LOG_HBLKSIZE)
|
|
|
|
# define HBLK_PTR_DIFF(p,q) divHBLKSZ((ptr_t)p - (ptr_t)q)
|
|
/* Equivalent to subtracting 2 hblk pointers. */
|
|
/* We do it this way because a compiler should */
|
|
/* find it hard to use an integer division */
|
|
/* instead of a shift. The bundled SunOS 4.1 */
|
|
/* o.w. sometimes pessimizes the subtraction to */
|
|
/* involve a call to .div. */
|
|
|
|
# define modHBLKSZ(n) ((n) & (HBLKSIZE-1))
|
|
|
|
# define HBLKPTR(objptr) ((struct hblk *)(((word) (objptr)) & ~(HBLKSIZE-1)))
|
|
|
|
# define HBLKDISPL(objptr) (((word) (objptr)) & (HBLKSIZE-1))
|
|
|
|
/* Round up byte allocation requests to integral number of words, etc. */
|
|
# ifdef ADD_BYTE_AT_END
|
|
# define ROUNDED_UP_WORDS(n) BYTES_TO_WORDS((n) + WORDS_TO_BYTES(1))
|
|
# ifdef ALIGN_DOUBLE
|
|
# define ALIGNED_WORDS(n) (BYTES_TO_WORDS((n) + WORDS_TO_BYTES(2)) & ~1)
|
|
# else
|
|
# define ALIGNED_WORDS(n) ROUNDED_UP_WORDS(n)
|
|
# endif
|
|
# define SMALL_OBJ(bytes) ((bytes) < WORDS_TO_BYTES(MAXOBJSZ))
|
|
# define ADD_SLOP(bytes) ((bytes)+1)
|
|
# else
|
|
# define ROUNDED_UP_WORDS(n) BYTES_TO_WORDS((n) + (WORDS_TO_BYTES(1) - 1))
|
|
# ifdef ALIGN_DOUBLE
|
|
# define ALIGNED_WORDS(n) \
|
|
(BYTES_TO_WORDS((n) + WORDS_TO_BYTES(2) - 1) & ~1)
|
|
# else
|
|
# define ALIGNED_WORDS(n) ROUNDED_UP_WORDS(n)
|
|
# endif
|
|
# define SMALL_OBJ(bytes) ((bytes) <= WORDS_TO_BYTES(MAXOBJSZ))
|
|
# define ADD_SLOP(bytes) (bytes)
|
|
# endif
|
|
|
|
|
|
/*
|
|
* Hash table representation of sets of pages. This assumes it is
|
|
* OK to add spurious entries to sets.
|
|
* Used by black-listing code, and perhaps by dirty bit maintenance code.
|
|
*/
|
|
|
|
# ifdef LARGE_CONFIG
|
|
# define LOG_PHT_ENTRIES 17
|
|
# else
|
|
# define LOG_PHT_ENTRIES 14 /* Collisions are likely if heap grows */
|
|
/* to more than 16K hblks = 64MB. */
|
|
/* Each hash table occupies 2K bytes. */
|
|
# endif
|
|
# define PHT_ENTRIES ((word)1 << LOG_PHT_ENTRIES)
|
|
# define PHT_SIZE (PHT_ENTRIES >> LOGWL)
|
|
typedef word page_hash_table[PHT_SIZE];
|
|
|
|
# define PHT_HASH(addr) ((((word)(addr)) >> LOG_HBLKSIZE) & (PHT_ENTRIES - 1))
|
|
|
|
# define get_pht_entry_from_index(bl, index) \
|
|
(((bl)[divWORDSZ(index)] >> modWORDSZ(index)) & 1)
|
|
# define set_pht_entry_from_index(bl, index) \
|
|
(bl)[divWORDSZ(index)] |= (word)1 << modWORDSZ(index)
|
|
# define clear_pht_entry_from_index(bl, index) \
|
|
(bl)[divWORDSZ(index)] &= ~((word)1 << modWORDSZ(index))
|
|
|
|
|
|
|
|
/********************************************/
|
|
/* */
|
|
/* H e a p B l o c k s */
|
|
/* */
|
|
/********************************************/
|
|
|
|
/* heap block header */
|
|
#define HBLKMASK (HBLKSIZE-1)
|
|
|
|
#define BITS_PER_HBLK (HBLKSIZE * 8)
|
|
|
|
#define MARK_BITS_PER_HBLK (BITS_PER_HBLK/CPP_WORDSZ)
|
|
/* upper bound */
|
|
/* We allocate 1 bit/word. Only the first word */
|
|
/* in each object is actually marked. */
|
|
|
|
# ifdef ALIGN_DOUBLE
|
|
# define MARK_BITS_SZ (((MARK_BITS_PER_HBLK + 2*CPP_WORDSZ - 1) \
|
|
/ (2*CPP_WORDSZ))*2)
|
|
# else
|
|
# define MARK_BITS_SZ ((MARK_BITS_PER_HBLK + CPP_WORDSZ - 1)/CPP_WORDSZ)
|
|
# endif
|
|
/* Upper bound on number of mark words per heap block */
|
|
|
|
struct hblkhdr {
|
|
word hb_sz; /* If in use, size in words, of objects in the block. */
|
|
/* if free, the size in bytes of the whole block */
|
|
struct hblk * hb_next; /* Link field for hblk free list */
|
|
/* and for lists of chunks waiting to be */
|
|
/* reclaimed. */
|
|
word hb_descr; /* object descriptor for marking. See */
|
|
/* mark.h. */
|
|
char* hb_map; /* A pointer to a pointer validity map of the block. */
|
|
/* See GC_obj_map. */
|
|
/* Valid for all blocks with headers. */
|
|
/* Free blocks point to GC_invalid_map. */
|
|
unsigned char hb_obj_kind;
|
|
/* Kind of objects in the block. Each kind */
|
|
/* identifies a mark procedure and a set of */
|
|
/* list headers. Sometimes called regions. */
|
|
unsigned char hb_flags;
|
|
# define IGNORE_OFF_PAGE 1 /* Ignore pointers that do not */
|
|
/* point to the first page of */
|
|
/* this object. */
|
|
unsigned short hb_last_reclaimed;
|
|
/* Value of GC_gc_no when block was */
|
|
/* last allocated or swept. May wrap. */
|
|
word hb_marks[MARK_BITS_SZ];
|
|
/* Bit i in the array refers to the */
|
|
/* object starting at the ith word (header */
|
|
/* INCLUDED) in the heap block. */
|
|
/* The lsb of word 0 is numbered 0. */
|
|
};
|
|
|
|
/* heap block body */
|
|
|
|
# define DISCARD_WORDS 0
|
|
/* Number of words to be dropped at the beginning of each block */
|
|
/* Must be a multiple of WORDSZ. May reasonably be nonzero */
|
|
/* on machines that don't guarantee longword alignment of */
|
|
/* pointers, so that the number of false hits is minimized. */
|
|
/* 0 and WORDSZ are probably the only reasonable values. */
|
|
|
|
# define BODY_SZ ((HBLKSIZE-WORDS_TO_BYTES(DISCARD_WORDS))/sizeof(word))
|
|
|
|
struct hblk {
|
|
# if (DISCARD_WORDS != 0)
|
|
word garbage[DISCARD_WORDS];
|
|
# endif
|
|
word hb_body[BODY_SZ];
|
|
};
|
|
|
|
# define HDR_WORDS ((word)DISCARD_WORDS)
|
|
# define HDR_BYTES ((word)WORDS_TO_BYTES(DISCARD_WORDS))
|
|
|
|
# define OBJ_SZ_TO_BLOCKS(sz) \
|
|
divHBLKSZ(HDR_BYTES + WORDS_TO_BYTES(sz) + HBLKSIZE-1)
|
|
/* Size of block (in units of HBLKSIZE) needed to hold objects of */
|
|
/* given sz (in words). */
|
|
|
|
/* Object free list link */
|
|
# define obj_link(p) (*(ptr_t *)(p))
|
|
|
|
/* lists of all heap blocks and free lists */
|
|
/* These are grouped together in a struct */
|
|
/* so that they can be easily skipped by the */
|
|
/* GC_mark routine. */
|
|
/* The ordering is weird to make GC_malloc */
|
|
/* faster by keeping the important fields */
|
|
/* sufficiently close together that a */
|
|
/* single load of a base register will do. */
|
|
/* Scalars that could easily appear to */
|
|
/* be pointers are also put here. */
|
|
/* The main fields should precede any */
|
|
/* conditionally included fields, so that */
|
|
/* gc_inl.h will work even if a different set */
|
|
/* of macros is defined when the client is */
|
|
/* compiled. */
|
|
|
|
struct _GC_arrays {
|
|
word _heapsize;
|
|
word _max_heapsize;
|
|
ptr_t _last_heap_addr;
|
|
ptr_t _prev_heap_addr;
|
|
word _words_allocd_before_gc;
|
|
/* Number of words allocated before this */
|
|
/* collection cycle. */
|
|
word _words_allocd;
|
|
/* Number of words allocated during this collection cycle */
|
|
word _words_wasted;
|
|
/* Number of words wasted due to internal fragmentation */
|
|
/* in large objects, or due to dropping blacklisted */
|
|
/* blocks, since last gc. Approximate. */
|
|
word _words_finalized;
|
|
/* Approximate number of words in objects (and headers) */
|
|
/* That became ready for finalization in the last */
|
|
/* collection. */
|
|
word _non_gc_bytes_at_gc;
|
|
/* Number of explicitly managed bytes of storage */
|
|
/* at last collection. */
|
|
word _mem_freed;
|
|
/* Number of explicitly deallocated words of memory */
|
|
/* since last collection. */
|
|
|
|
ptr_t _objfreelist[MAXOBJSZ+1];
|
|
/* free list for objects */
|
|
ptr_t _aobjfreelist[MAXOBJSZ+1];
|
|
/* free list for atomic objs */
|
|
|
|
ptr_t _uobjfreelist[MAXOBJSZ+1];
|
|
/* uncollectable but traced objs */
|
|
/* objects on this and auobjfreelist */
|
|
/* are always marked, except during */
|
|
/* garbage collections. */
|
|
# ifdef ATOMIC_UNCOLLECTABLE
|
|
ptr_t _auobjfreelist[MAXOBJSZ+1];
|
|
# endif
|
|
/* uncollectable but traced objs */
|
|
|
|
# ifdef GATHERSTATS
|
|
word _composite_in_use;
|
|
/* Number of words in accessible composite */
|
|
/* objects. */
|
|
word _atomic_in_use;
|
|
/* Number of words in accessible atomic */
|
|
/* objects. */
|
|
# endif
|
|
# ifdef MERGE_SIZES
|
|
unsigned _size_map[WORDS_TO_BYTES(MAXOBJSZ+1)];
|
|
/* Number of words to allocate for a given allocation request in */
|
|
/* bytes. */
|
|
# endif
|
|
|
|
# ifdef STUBBORN_ALLOC
|
|
ptr_t _sobjfreelist[MAXOBJSZ+1];
|
|
# endif
|
|
/* free list for immutable objects */
|
|
ptr_t _obj_map[MAXOBJSZ+1];
|
|
/* If not NIL, then a pointer to a map of valid */
|
|
/* object addresses. _obj_map[sz][i] is j if the */
|
|
/* address block_start+i is a valid pointer */
|
|
/* to an object at */
|
|
/* block_start+i&~3 - WORDS_TO_BYTES(j). */
|
|
/* (If ALL_INTERIOR_POINTERS is defined, then */
|
|
/* instead ((short *)(hbh_map[sz])[i] is j if */
|
|
/* block_start+WORDS_TO_BYTES(i) is in the */
|
|
/* interior of an object starting at */
|
|
/* block_start+WORDS_TO_BYTES(i-j)). */
|
|
/* It is OBJ_INVALID if */
|
|
/* block_start+WORDS_TO_BYTES(i) is not */
|
|
/* valid as a pointer to an object. */
|
|
/* We assume all values of j <= OBJ_INVALID. */
|
|
/* The zeroth entry corresponds to large objects.*/
|
|
# ifdef ALL_INTERIOR_POINTERS
|
|
# define map_entry_type short
|
|
# define OBJ_INVALID 0x7fff
|
|
# define MAP_ENTRY(map, bytes) \
|
|
(((map_entry_type *)(map))[BYTES_TO_WORDS(bytes)])
|
|
# define MAP_ENTRIES BYTES_TO_WORDS(HBLKSIZE)
|
|
# define MAP_SIZE (MAP_ENTRIES * sizeof(map_entry_type))
|
|
# define OFFSET_VALID(displ) TRUE
|
|
# define CPP_MAX_OFFSET (HBLKSIZE - HDR_BYTES - 1)
|
|
# define MAX_OFFSET ((word)CPP_MAX_OFFSET)
|
|
# else
|
|
# define map_entry_type char
|
|
# define OBJ_INVALID 0x7f
|
|
# define MAP_ENTRY(map, bytes) \
|
|
(map)[bytes]
|
|
# define MAP_ENTRIES HBLKSIZE
|
|
# define MAP_SIZE MAP_ENTRIES
|
|
# define CPP_MAX_OFFSET (WORDS_TO_BYTES(OBJ_INVALID) - 1)
|
|
# define MAX_OFFSET ((word)CPP_MAX_OFFSET)
|
|
# define VALID_OFFSET_SZ \
|
|
(CPP_MAX_OFFSET > WORDS_TO_BYTES(CPP_MAXOBJSZ)? \
|
|
CPP_MAX_OFFSET+1 \
|
|
: WORDS_TO_BYTES(CPP_MAXOBJSZ)+1)
|
|
char _valid_offsets[VALID_OFFSET_SZ];
|
|
/* GC_valid_offsets[i] == TRUE ==> i */
|
|
/* is registered as a displacement. */
|
|
# define OFFSET_VALID(displ) GC_valid_offsets[displ]
|
|
char _modws_valid_offsets[sizeof(word)];
|
|
/* GC_valid_offsets[i] ==> */
|
|
/* GC_modws_valid_offsets[i%sizeof(word)] */
|
|
# endif
|
|
# ifdef STUBBORN_ALLOC
|
|
page_hash_table _changed_pages;
|
|
/* Stubborn object pages that were changes since last call to */
|
|
/* GC_read_changed. */
|
|
page_hash_table _prev_changed_pages;
|
|
/* Stubborn object pages that were changes before last call to */
|
|
/* GC_read_changed. */
|
|
# endif
|
|
# if defined(PROC_VDB) || defined(MPROTECT_VDB)
|
|
page_hash_table _grungy_pages; /* Pages that were dirty at last */
|
|
/* GC_read_dirty. */
|
|
# endif
|
|
# ifdef LARGE_CONFIG
|
|
# if CPP_WORDSZ > 32
|
|
# define MAX_HEAP_SECTS 4096 /* overflows at roughly 64 GB */
|
|
# else
|
|
# define MAX_HEAP_SECTS 768 /* Separately added heap sections. */
|
|
# endif
|
|
# else
|
|
# define MAX_HEAP_SECTS 256
|
|
# endif
|
|
struct HeapSect {
|
|
ptr_t hs_start; word hs_bytes;
|
|
} _heap_sects[MAX_HEAP_SECTS];
|
|
# ifdef MSWIN32
|
|
ptr_t _heap_bases[MAX_HEAP_SECTS];
|
|
/* Start address of memory regions obtained from kernel. */
|
|
# endif
|
|
/* Block header index; see gc_headers.h */
|
|
bottom_index * _all_nils;
|
|
bottom_index * _top_index [TOP_SZ];
|
|
#ifdef SAVE_CALL_CHAIN
|
|
struct callinfo _last_stack[NFRAMES]; /* Stack at last garbage collection.*/
|
|
/* Useful for debugging mysterious */
|
|
/* object disappearances. */
|
|
/* In the multithreaded case, we */
|
|
/* currently only save the calling */
|
|
/* stack. */
|
|
#endif
|
|
};
|
|
|
|
GC_API GC_FAR struct _GC_arrays GC_arrays;
|
|
|
|
# define GC_objfreelist GC_arrays._objfreelist
|
|
# define GC_aobjfreelist GC_arrays._aobjfreelist
|
|
# define GC_uobjfreelist GC_arrays._uobjfreelist
|
|
# ifdef ATOMIC_UNCOLLECTABLE
|
|
# define GC_auobjfreelist GC_arrays._auobjfreelist
|
|
# endif
|
|
# define GC_sobjfreelist GC_arrays._sobjfreelist
|
|
# define GC_valid_offsets GC_arrays._valid_offsets
|
|
# define GC_modws_valid_offsets GC_arrays._modws_valid_offsets
|
|
# ifdef STUBBORN_ALLOC
|
|
# define GC_changed_pages GC_arrays._changed_pages
|
|
# define GC_prev_changed_pages GC_arrays._prev_changed_pages
|
|
# endif
|
|
# define GC_obj_map GC_arrays._obj_map
|
|
# define GC_last_heap_addr GC_arrays._last_heap_addr
|
|
# define GC_prev_heap_addr GC_arrays._prev_heap_addr
|
|
# define GC_words_allocd GC_arrays._words_allocd
|
|
# define GC_words_wasted GC_arrays._words_wasted
|
|
# define GC_words_finalized GC_arrays._words_finalized
|
|
# define GC_non_gc_bytes_at_gc GC_arrays._non_gc_bytes_at_gc
|
|
# define GC_mem_freed GC_arrays._mem_freed
|
|
# define GC_heapsize GC_arrays._heapsize
|
|
# define GC_max_heapsize GC_arrays._max_heapsize
|
|
# define GC_words_allocd_before_gc GC_arrays._words_allocd_before_gc
|
|
# define GC_heap_sects GC_arrays._heap_sects
|
|
# define GC_last_stack GC_arrays._last_stack
|
|
# ifdef MSWIN32
|
|
# define GC_heap_bases GC_arrays._heap_bases
|
|
# endif
|
|
# define GC_all_nils GC_arrays._all_nils
|
|
# define GC_top_index GC_arrays._top_index
|
|
# if defined(PROC_VDB) || defined(MPROTECT_VDB)
|
|
# define GC_grungy_pages GC_arrays._grungy_pages
|
|
# endif
|
|
# ifdef GATHERSTATS
|
|
# define GC_composite_in_use GC_arrays._composite_in_use
|
|
# define GC_atomic_in_use GC_arrays._atomic_in_use
|
|
# endif
|
|
# ifdef MERGE_SIZES
|
|
# define GC_size_map GC_arrays._size_map
|
|
# endif
|
|
|
|
# define beginGC_arrays ((ptr_t)(&GC_arrays))
|
|
# define endGC_arrays (((ptr_t)(&GC_arrays)) + (sizeof GC_arrays))
|
|
|
|
GC_API word GC_fo_entries;
|
|
|
|
# define MAXOBJKINDS 16
|
|
|
|
/* Object kinds: */
|
|
extern struct obj_kind {
|
|
ptr_t *ok_freelist; /* Array of free listheaders for this kind of object */
|
|
/* Point either to GC_arrays or to storage allocated */
|
|
/* with GC_scratch_alloc. */
|
|
struct hblk **ok_reclaim_list;
|
|
/* List headers for lists of blocks waiting to be */
|
|
/* swept. */
|
|
word ok_descriptor; /* Descriptor template for objects in this */
|
|
/* block. */
|
|
GC_bool ok_relocate_descr;
|
|
/* Add object size in bytes to descriptor */
|
|
/* template to obtain descriptor. Otherwise */
|
|
/* template is used as is. */
|
|
GC_bool ok_init; /* Clear objects before putting them on the free list. */
|
|
} GC_obj_kinds[MAXOBJKINDS];
|
|
/* Predefined kinds: */
|
|
# define PTRFREE 0
|
|
# define NORMAL 1
|
|
# define UNCOLLECTABLE 2
|
|
# ifdef ATOMIC_UNCOLLECTABLE
|
|
# define AUNCOLLECTABLE 3
|
|
# define STUBBORN 4
|
|
# define IS_UNCOLLECTABLE(k) (((k) & ~1) == UNCOLLECTABLE)
|
|
# else
|
|
# define STUBBORN 3
|
|
# define IS_UNCOLLECTABLE(k) ((k) == UNCOLLECTABLE)
|
|
# endif
|
|
|
|
extern int GC_n_kinds;
|
|
|
|
extern word GC_n_heap_sects; /* Number of separately added heap */
|
|
/* sections. */
|
|
|
|
extern word GC_page_size;
|
|
|
|
# ifdef MSWIN32
|
|
extern word GC_n_heap_bases; /* See GC_heap_bases. */
|
|
# endif
|
|
|
|
extern word GC_total_stack_black_listed;
|
|
/* Number of bytes on stack blacklist. */
|
|
|
|
extern word GC_black_list_spacing;
|
|
/* Average number of bytes between blacklisted */
|
|
/* blocks. Approximate. */
|
|
/* Counts only blocks that are */
|
|
/* "stack-blacklisted", i.e. that are */
|
|
/* problematic in the interior of an object. */
|
|
|
|
extern char * GC_invalid_map;
|
|
/* Pointer to the nowhere valid hblk map */
|
|
/* Blocks pointing to this map are free. */
|
|
|
|
extern struct hblk * GC_hblkfreelist;
|
|
/* List of completely empty heap blocks */
|
|
/* Linked through hb_next field of */
|
|
/* header structure associated with */
|
|
/* block. */
|
|
|
|
extern GC_bool GC_is_initialized; /* GC_init() has been run. */
|
|
|
|
extern GC_bool GC_objects_are_marked; /* There are marked objects in */
|
|
/* the heap. */
|
|
|
|
extern GC_bool GC_incremental; /* Using incremental/generational collection. */
|
|
|
|
extern GC_bool GC_dirty_maintained;
|
|
/* Dirty bits are being maintained, */
|
|
/* either for incremental collection, */
|
|
/* or to limit the root set. */
|
|
|
|
# ifndef PCR
|
|
extern ptr_t GC_stackbottom; /* Cool end of user stack */
|
|
# endif
|
|
|
|
extern word GC_root_size; /* Total size of registered root sections */
|
|
|
|
extern GC_bool GC_debugging_started; /* GC_debug_malloc has been called. */
|
|
|
|
extern ptr_t GC_least_plausible_heap_addr;
|
|
extern ptr_t GC_greatest_plausible_heap_addr;
|
|
/* Bounds on the heap. Guaranteed valid */
|
|
/* Likely to include future heap expansion. */
|
|
|
|
/* Operations */
|
|
# ifndef abs
|
|
# define abs(x) ((x) < 0? (-(x)) : (x))
|
|
# endif
|
|
|
|
|
|
/* Marks are in a reserved area in */
|
|
/* each heap block. Each word has one mark bit associated */
|
|
/* with it. Only those corresponding to the beginning of an */
|
|
/* object are used. */
|
|
|
|
|
|
/* Mark bit operations */
|
|
|
|
/*
|
|
* Retrieve, set, clear the mark bit corresponding
|
|
* to the nth word in a given heap block.
|
|
*
|
|
* (Recall that bit n corresponds to object beginning at word n
|
|
* relative to the beginning of the block, including unused words)
|
|
*/
|
|
|
|
# define mark_bit_from_hdr(hhdr,n) (((hhdr)->hb_marks[divWORDSZ(n)] \
|
|
>> (modWORDSZ(n))) & (word)1)
|
|
# define set_mark_bit_from_hdr(hhdr,n) (hhdr)->hb_marks[divWORDSZ(n)] \
|
|
|= (word)1 << modWORDSZ(n)
|
|
|
|
# define clear_mark_bit_from_hdr(hhdr,n) (hhdr)->hb_marks[divWORDSZ(n)] \
|
|
&= ~((word)1 << modWORDSZ(n))
|
|
|
|
/* Important internal collector routines */
|
|
|
|
ptr_t GC_approx_sp();
|
|
|
|
GC_bool GC_should_collect();
|
|
#ifdef PRESERVE_LAST
|
|
GC_bool GC_in_last_heap_sect(/* ptr_t */);
|
|
/* In last added heap section? If so, avoid breaking up. */
|
|
#endif
|
|
void GC_apply_to_all_blocks(/*fn, client_data*/);
|
|
/* Invoke fn(hbp, client_data) for each */
|
|
/* allocated heap block. */
|
|
struct hblk * GC_next_block(/* struct hblk * h */);
|
|
void GC_mark_init();
|
|
void GC_clear_marks(); /* Clear mark bits for all heap objects. */
|
|
void GC_invalidate_mark_state(); /* Tell the marker that marked */
|
|
/* objects may point to unmarked */
|
|
/* ones, and roots may point to */
|
|
/* unmarked objects. */
|
|
/* Reset mark stack. */
|
|
void GC_mark_from_mark_stack(); /* Mark from everything on the mark stack. */
|
|
/* Return after about one pages worth of */
|
|
/* work. */
|
|
GC_bool GC_mark_stack_empty();
|
|
GC_bool GC_mark_some(); /* Perform about one pages worth of marking */
|
|
/* work of whatever kind is needed. Returns */
|
|
/* quickly if no collection is in progress. */
|
|
/* Return TRUE if mark phase finished. */
|
|
void GC_initiate_gc(); /* initiate collection. */
|
|
/* If the mark state is invalid, this */
|
|
/* becomes full colleection. Otherwise */
|
|
/* it's partial. */
|
|
void GC_push_all(/*b,t*/); /* Push everything in a range */
|
|
/* onto mark stack. */
|
|
void GC_push_dirty(/*b,t*/); /* Push all possibly changed */
|
|
/* subintervals of [b,t) onto */
|
|
/* mark stack. */
|
|
#ifndef SMALL_CONFIG
|
|
void GC_push_conditional(/* ptr_t b, ptr_t t, GC_bool all*/);
|
|
#else
|
|
# define GC_push_conditional(b, t, all) GC_push_all(b, t)
|
|
#endif
|
|
/* Do either of the above, depending */
|
|
/* on the third arg. */
|
|
void GC_push_all_stack(/*b,t*/); /* As above, but consider */
|
|
/* interior pointers as valid */
|
|
void GC_push_roots(/* GC_bool all */); /* Push all or dirty roots. */
|
|
extern void (*GC_push_other_roots)();
|
|
/* Push system or application specific roots */
|
|
/* onto the mark stack. In some environments */
|
|
/* (e.g. threads environments) this is */
|
|
/* predfined to be non-zero. A client supplied */
|
|
/* replacement should also call the original */
|
|
/* function. */
|
|
extern void (*GC_start_call_back)(/* void */);
|
|
/* Called at start of full collections. */
|
|
/* Not called if 0. Called with allocation */
|
|
/* lock held. */
|
|
/* 0 by default. */
|
|
void GC_push_regs(); /* Push register contents onto mark stack. */
|
|
void GC_remark(); /* Mark from all marked objects. Used */
|
|
/* only if we had to drop something. */
|
|
# if defined(MSWIN32)
|
|
void __cdecl GC_push_one();
|
|
# else
|
|
void GC_push_one(/*p*/); /* If p points to an object, mark it */
|
|
/* and push contents on the mark stack */
|
|
# endif
|
|
void GC_push_one_checked(/*p*/); /* Ditto, omits plausibility test */
|
|
void GC_push_marked(/* struct hblk h, hdr * hhdr */);
|
|
/* Push contents of all marked objects in h onto */
|
|
/* mark stack. */
|
|
#ifdef SMALL_CONFIG
|
|
# define GC_push_next_marked_dirty(h) GC_push_next_marked(h)
|
|
#else
|
|
struct hblk * GC_push_next_marked_dirty(/* h */);
|
|
/* Invoke GC_push_marked on next dirty block above h. */
|
|
/* Return a pointer just past the end of this block. */
|
|
#endif /* !SMALL_CONFIG */
|
|
struct hblk * GC_push_next_marked(/* h */);
|
|
/* Ditto, but also mark from clean pages. */
|
|
struct hblk * GC_push_next_marked_uncollectable(/* h */);
|
|
/* Ditto, but mark only from uncollectable pages. */
|
|
GC_bool GC_stopped_mark(); /* Stop world and mark from all roots */
|
|
/* and rescuers. */
|
|
void GC_clear_hdr_marks(/* hhdr */); /* Clear the mark bits in a header */
|
|
void GC_set_hdr_marks(/* hhdr */); /* Set the mark bits in a header */
|
|
void GC_add_roots_inner();
|
|
GC_bool GC_is_static_root(/* ptr_t p */);
|
|
/* Is the address p in one of the registered static */
|
|
/* root sections? */
|
|
void GC_register_dynamic_libraries();
|
|
/* Add dynamic library data sections to the root set. */
|
|
|
|
/* Machine dependent startup routines */
|
|
ptr_t GC_get_stack_base();
|
|
void GC_register_data_segments();
|
|
|
|
/* Black listing: */
|
|
void GC_bl_init();
|
|
# ifndef ALL_INTERIOR_POINTERS
|
|
void GC_add_to_black_list_normal(/* bits, maybe source */);
|
|
/* Register bits as a possible future false */
|
|
/* reference from the heap or static data */
|
|
# ifdef PRINT_BLACK_LIST
|
|
# define GC_ADD_TO_BLACK_LIST_NORMAL(bits, source) \
|
|
GC_add_to_black_list_normal(bits, source)
|
|
# else
|
|
# define GC_ADD_TO_BLACK_LIST_NORMAL(bits, source) \
|
|
GC_add_to_black_list_normal(bits)
|
|
# endif
|
|
# else
|
|
# ifdef PRINT_BLACK_LIST
|
|
# define GC_ADD_TO_BLACK_LIST_NORMAL(bits, source) \
|
|
GC_add_to_black_list_stack(bits, source)
|
|
# else
|
|
# define GC_ADD_TO_BLACK_LIST_NORMAL(bits, source) \
|
|
GC_add_to_black_list_stack(bits)
|
|
# endif
|
|
# endif
|
|
|
|
void GC_add_to_black_list_stack(/* bits, maybe source */);
|
|
struct hblk * GC_is_black_listed(/* h, len */);
|
|
/* If there are likely to be false references */
|
|
/* to a block starting at h of the indicated */
|
|
/* length, then return the next plausible */
|
|
/* starting location for h that might avoid */
|
|
/* these false references. */
|
|
void GC_promote_black_lists();
|
|
/* Declare an end to a black listing phase. */
|
|
void GC_unpromote_black_lists();
|
|
/* Approximately undo the effect of the above. */
|
|
/* This actually loses some information, but */
|
|
/* only in a reasonably safe way. */
|
|
word GC_number_stack_black_listed(/*struct hblk *start, struct hblk *endp1 */);
|
|
/* Return the number of (stack) blacklisted */
|
|
/* blocks in the range for statistical */
|
|
/* purposes. */
|
|
|
|
ptr_t GC_scratch_alloc(/*bytes*/);
|
|
/* GC internal memory allocation for */
|
|
/* small objects. Deallocation is not */
|
|
/* possible. */
|
|
|
|
/* Heap block layout maps: */
|
|
void GC_invalidate_map(/* hdr */);
|
|
/* Remove the object map associated */
|
|
/* with the block. This identifies */
|
|
/* the block as invalid to the mark */
|
|
/* routines. */
|
|
GC_bool GC_add_map_entry(/*sz*/);
|
|
/* Add a heap block map for objects of */
|
|
/* size sz to obj_map. */
|
|
/* Return FALSE on failure. */
|
|
void GC_register_displacement_inner(/*offset*/);
|
|
/* Version of GC_register_displacement */
|
|
/* that assumes lock is already held */
|
|
/* and signals are already disabled. */
|
|
|
|
/* hblk allocation: */
|
|
void GC_new_hblk(/*size_in_words, kind*/);
|
|
/* Allocate a new heap block, and build */
|
|
/* a free list in it. */
|
|
struct hblk * GC_allochblk(/*size_in_words, kind*/);
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/* Allocate a heap block, clear it if */
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/* for composite objects, inform */
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/* the marker that block is valid */
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/* for objects of indicated size. */
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/* sz < 0 ==> atomic. */
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void GC_freehblk(); /* Deallocate a heap block and mark it */
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/* as invalid. */
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|
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/* Misc GC: */
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void GC_init_inner();
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GC_bool GC_expand_hp_inner();
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void GC_start_reclaim(/*abort_if_found*/);
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/* Restore unmarked objects to free */
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/* lists, or (if abort_if_found is */
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/* TRUE) report them. */
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/* Sweeping of small object pages is */
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/* largely deferred. */
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void GC_continue_reclaim(/*size, kind*/);
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|
/* Sweep pages of the given size and */
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/* kind, as long as possible, and */
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/* as long as the corr. free list is */
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/* empty. */
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void GC_reclaim_or_delete_all();
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/* Arrange for all reclaim lists to be */
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/* empty. Judiciously choose between */
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/* sweeping and discarding each page. */
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GC_bool GC_reclaim_all(/* GC_stop_func f*/);
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/* Reclaim all blocks. Abort (in a */
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|
/* consistent state) if f returns TRUE. */
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GC_bool GC_block_empty(/* hhdr */); /* Block completely unmarked? */
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GC_bool GC_never_stop_func(); /* Returns FALSE. */
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GC_bool GC_try_to_collect_inner(/* GC_stop_func f */);
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|
/* Collect; caller must have acquired */
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|
/* lock and disabled signals. */
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|
/* Collection is aborted if f returns */
|
|
/* TRUE. Returns TRUE if it completes */
|
|
/* successfully. */
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|
# define GC_gcollect_inner() \
|
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(void) GC_try_to_collect_inner(GC_never_stop_func)
|
|
void GC_finish_collection(); /* Finish collection. Mark bits are */
|
|
/* consistent and lock is still held. */
|
|
GC_bool GC_collect_or_expand(/* needed_blocks */);
|
|
/* Collect or expand heap in an attempt */
|
|
/* make the indicated number of free */
|
|
/* blocks available. Should be called */
|
|
/* until the blocks are available or */
|
|
/* until it fails by returning FALSE. */
|
|
void GC_init(); /* Initialize collector. */
|
|
void GC_collect_a_little_inner(/* int n */);
|
|
/* Do n units worth of garbage */
|
|
/* collection work, if appropriate. */
|
|
/* A unit is an amount appropriate for */
|
|
/* HBLKSIZE bytes of allocation. */
|
|
ptr_t GC_generic_malloc(/* bytes, kind */);
|
|
/* Allocate an object of the given */
|
|
/* kind. By default, there are only */
|
|
/* a few kinds: composite(pointerfree), */
|
|
/* atomic, uncollectable, etc. */
|
|
/* We claim it's possible for clever */
|
|
/* client code that understands GC */
|
|
/* internals to add more, e.g. to */
|
|
/* communicate object layout info */
|
|
/* to the collector. */
|
|
ptr_t GC_generic_malloc_ignore_off_page(/* bytes, kind */);
|
|
/* As above, but pointers past the */
|
|
/* first page of the resulting object */
|
|
/* are ignored. */
|
|
ptr_t GC_generic_malloc_inner(/* bytes, kind */);
|
|
/* Ditto, but I already hold lock, etc. */
|
|
ptr_t GC_generic_malloc_words_small GC_PROTO((size_t words, int kind));
|
|
/* As above, but size in units of words */
|
|
/* Bypasses MERGE_SIZES. Assumes */
|
|
/* words <= MAXOBJSZ. */
|
|
ptr_t GC_generic_malloc_inner_ignore_off_page(/* bytes, kind */);
|
|
/* Allocate an object, where */
|
|
/* the client guarantees that there */
|
|
/* will always be a pointer to the */
|
|
/* beginning of the object while the */
|
|
/* object is live. */
|
|
ptr_t GC_allocobj(/* sz_inn_words, kind */);
|
|
/* Make the indicated */
|
|
/* free list nonempty, and return its */
|
|
/* head. */
|
|
|
|
void GC_init_headers();
|
|
GC_bool GC_install_header(/*h*/);
|
|
/* Install a header for block h. */
|
|
/* Return FALSE on failure. */
|
|
GC_bool GC_install_counts(/*h, sz*/);
|
|
/* Set up forwarding counts for block */
|
|
/* h of size sz. */
|
|
/* Return FALSE on failure. */
|
|
void GC_remove_header(/*h*/);
|
|
/* Remove the header for block h. */
|
|
void GC_remove_counts(/*h, sz*/);
|
|
/* Remove forwarding counts for h. */
|
|
hdr * GC_find_header(/*p*/); /* Debugging only. */
|
|
|
|
void GC_finalize(); /* Perform all indicated finalization actions */
|
|
/* on unmarked objects. */
|
|
/* Unreachable finalizable objects are enqueued */
|
|
/* for processing by GC_invoke_finalizers. */
|
|
/* Invoked with lock. */
|
|
|
|
void GC_add_to_heap(/*p, bytes*/);
|
|
/* Add a HBLKSIZE aligned chunk to the heap. */
|
|
|
|
void GC_print_obj(/* ptr_t p */);
|
|
/* P points to somewhere inside an object with */
|
|
/* debugging info. Print a human readable */
|
|
/* description of the object to stderr. */
|
|
ptr_t GC_debug_object_start(/* ptr_t p */);
|
|
/* P points to the start of an object that may */
|
|
/* have debug info at its head. Return the */
|
|
/* start of the real data. */
|
|
extern void (*GC_check_heap)();
|
|
/* Check that all objects in the heap with */
|
|
/* debugging info are intact. Print */
|
|
/* descriptions of any that are not. */
|
|
extern void (*GC_print_heap_obj)(/* ptr_t p */);
|
|
/* If possible print s followed by a more */
|
|
/* detailed description of the object */
|
|
/* referred to by p. */
|
|
|
|
/* Virtual dirty bit implementation: */
|
|
/* Each implementation exports the following: */
|
|
void GC_read_dirty(); /* Retrieve dirty bits. */
|
|
GC_bool GC_page_was_dirty(/* struct hblk * h */);
|
|
/* Read retrieved dirty bits. */
|
|
GC_bool GC_page_was_ever_dirty(/* struct hblk * h */);
|
|
/* Could the page contain valid heap pointers? */
|
|
void GC_is_fresh(/* struct hblk * h, word number_of_blocks */);
|
|
/* Assert the region currently contains no */
|
|
/* valid pointers. */
|
|
void GC_write_hint(/* struct hblk * h */);
|
|
/* h is about to be written. */
|
|
void GC_dirty_init();
|
|
|
|
/* Slow/general mark bit manipulation: */
|
|
GC_bool GC_is_marked();
|
|
void GC_clear_mark_bit();
|
|
void GC_set_mark_bit();
|
|
|
|
/* Stubborn objects: */
|
|
void GC_read_changed(); /* Analogous to GC_read_dirty */
|
|
GC_bool GC_page_was_changed(/* h */); /* Analogous to GC_page_was_dirty */
|
|
void GC_clean_changing_list(); /* Collect obsolete changing list entries */
|
|
void GC_stubborn_init();
|
|
|
|
/* Debugging print routines: */
|
|
void GC_print_block_list();
|
|
void GC_print_hblkfreelist();
|
|
void GC_print_heap_sects();
|
|
void GC_print_static_roots();
|
|
void GC_dump();
|
|
|
|
/* Make arguments appear live to compiler */
|
|
# ifdef __WATCOMC__
|
|
void GC_noop(void*, ...);
|
|
# else
|
|
GC_API void GC_noop();
|
|
# endif
|
|
|
|
void GC_noop1(/* word arg */);
|
|
|
|
/* Logging and diagnostic output: */
|
|
GC_API void GC_printf GC_PROTO((char * format, long, long, long, long, long, long));
|
|
/* A version of printf that doesn't allocate, */
|
|
/* is restricted to long arguments, and */
|
|
/* (unfortunately) doesn't use varargs for */
|
|
/* portability. Restricted to 6 args and */
|
|
/* 1K total output length. */
|
|
/* (We use sprintf. Hopefully that doesn't */
|
|
/* allocate for long arguments.) */
|
|
# define GC_printf0(f) GC_printf(f, 0l, 0l, 0l, 0l, 0l, 0l)
|
|
# define GC_printf1(f,a) GC_printf(f, (long)a, 0l, 0l, 0l, 0l, 0l)
|
|
# define GC_printf2(f,a,b) GC_printf(f, (long)a, (long)b, 0l, 0l, 0l, 0l)
|
|
# define GC_printf3(f,a,b,c) GC_printf(f, (long)a, (long)b, (long)c, 0l, 0l, 0l)
|
|
# define GC_printf4(f,a,b,c,d) GC_printf(f, (long)a, (long)b, (long)c, \
|
|
(long)d, 0l, 0l)
|
|
# define GC_printf5(f,a,b,c,d,e) GC_printf(f, (long)a, (long)b, (long)c, \
|
|
(long)d, (long)e, 0l)
|
|
# define GC_printf6(f,a,b,c,d,e,g) GC_printf(f, (long)a, (long)b, (long)c, \
|
|
(long)d, (long)e, (long)g)
|
|
|
|
void GC_err_printf(/* format, a, b, c, d, e, f */);
|
|
# define GC_err_printf0(f) GC_err_puts(f)
|
|
# define GC_err_printf1(f,a) GC_err_printf(f, (long)a, 0l, 0l, 0l, 0l, 0l)
|
|
# define GC_err_printf2(f,a,b) GC_err_printf(f, (long)a, (long)b, 0l, 0l, 0l, 0l)
|
|
# define GC_err_printf3(f,a,b,c) GC_err_printf(f, (long)a, (long)b, (long)c, \
|
|
0l, 0l, 0l)
|
|
# define GC_err_printf4(f,a,b,c,d) GC_err_printf(f, (long)a, (long)b, \
|
|
(long)c, (long)d, 0l, 0l)
|
|
# define GC_err_printf5(f,a,b,c,d,e) GC_err_printf(f, (long)a, (long)b, \
|
|
(long)c, (long)d, \
|
|
(long)e, 0l)
|
|
# define GC_err_printf6(f,a,b,c,d,e,g) GC_err_printf(f, (long)a, (long)b, \
|
|
(long)c, (long)d, \
|
|
(long)e, (long)g)
|
|
/* Ditto, writes to stderr. */
|
|
|
|
void GC_err_puts(/* char *s */);
|
|
/* Write s to stderr, don't buffer, don't add */
|
|
/* newlines, don't ... */
|
|
|
|
|
|
# endif /* GC_PRIVATE_H */
|