boehm-gc/pcr_interface.c

   1 /*
   2  * Copyright (c) 1991-1994 by Xerox Corporation.  All rights reserved.
   3  *
   4  * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
   5  * OR IMPLIED.  ANY USE IS AT YOUR OWN RISK.
   6  *
   7  * Permission is hereby granted to use or copy this program
   8  * for any purpose,  provided the above notices are retained on all copies.
   9  * Permission to modify the code and to distribute modified code is granted,
  10  * provided the above notices are retained, and a notice that the code was
  11  * modified is included with the above copyright notice.
  12  */
  13 /* Boehm, February 7, 1996 11:09 am PST */
  14 # include "gc_priv.h"
  15
  16 # ifdef PCR
  17 /*
  18  * Note that POSIX PCR requires an ANSI C compiler.  Hence we are allowed
  19  * to make the same assumption here.
  20  * We wrap all of the allocator functions to avoid questions of
  21  * compatibility between the prototyped and nonprototyped versions of the f
  22  */
  23 # include "config/PCR_StdTypes.h"
  24 # include "mm/PCR_MM.h"
  25 # include <errno.h>
  26
  27 # define MY_MAGIC 17L
  28 # define MY_DEBUGMAGIC 42L
  29
  30 void * GC_AllocProc(size_t size, PCR_Bool ptrFree, PCR_Bool clear )
  31 {
  32     if (ptrFree) {
  33         void * result = (void *)GC_malloc_atomic(size);
  34         if (clear && result != 0) BZERO(result, size);
  35         return(result);
  36     } else {
  37         return((void *)GC_malloc(size));
  38     }
  39 }
  40
  41 void * GC_DebugAllocProc(size_t size, PCR_Bool ptrFree, PCR_Bool clear )
  42 {
  43     if (ptrFree) {
  44         void * result = (void *)GC_debug_malloc_atomic(size, __FILE__,
  45                                                              __LINE__);
  46         if (clear && result != 0) BZERO(result, size);
  47         return(result);
  48     } else {
  49         return((void *)GC_debug_malloc(size, __FILE__, __LINE__));
  50     }
  51 }
  52
  53 # define GC_ReallocProc GC_realloc
  54 void * GC_DebugReallocProc(void * old_object, size_t new_size_in_bytes)
  55 {
  56     return(GC_debug_realloc(old_object, new_size_in_bytes, __FILE__, __LINE__));
  57 }
  58
  59 # define GC_FreeProc GC_free
  60 # define GC_DebugFreeProc GC_debug_free
  61
  62 typedef struct {
  63   PCR_ERes (*ed_proc)(void *p, size_t size, PCR_Any data);
  64   GC_bool ed_pointerfree;
  65   PCR_ERes ed_fail_code;
  66   PCR_Any ed_client_data;
  67 } enumerate_data;
  68
  69 void GC_enumerate_block(h, ed)
  70 register struct hblk *h;
  71 enumerate_data * ed;
  72 {
  73     register hdr * hhdr;
  74     register int sz;
  75     word *p;
  76     word * lim;
  77
  78     hhdr = HDR(h);
  79     sz = hhdr -> hb_sz;
  80     if (sz >= 0 && ed -> ed_pointerfree
  81         || sz <= 0 && !(ed -> ed_pointerfree)) return;
  82     if (sz < 0) sz = -sz;
  83     lim = (word *)(h+1) - sz;
  84     p = (word *)h;
  85     do {
  86         if (PCR_ERes_IsErr(ed -> ed_fail_code)) return;
  87         ed -> ed_fail_code =
  88             (*(ed -> ed_proc))(p, WORDS_TO_BYTES(sz), ed -> ed_client_data);
  89         p+= sz;
  90     } while (p <= lim);
  91 }
  92
  93 struct PCR_MM_ProcsRep * GC_old_allocator = 0;
  94
  95 PCR_ERes GC_EnumerateProc(
  96     PCR_Bool ptrFree,
  97     PCR_ERes (*proc)(void *p, size_t size, PCR_Any data),
  98     PCR_Any data
  99 )
 100 {
 101     enumerate_data ed;
 102
 103     ed.ed_proc = proc;
 104     ed.ed_pointerfree = ptrFree;
 105     ed.ed_fail_code = PCR_ERes_okay;
 106     ed.ed_client_data = data;
 107     GC_apply_to_all_blocks(GC_enumerate_block, &ed);
 108     if (ed.ed_fail_code != PCR_ERes_okay) {
 109         return(ed.ed_fail_code);
 110     } else {
 111         /* Also enumerate objects allocated by my predecessors */
 112         return((*(GC_old_allocator->mmp_enumerate))(ptrFree, proc, data));
 113     }
 114 }
 115
 116 void GC_DummyFreeProc(void *p) {}
 117
 118 void GC_DummyShutdownProc(void) {}
 119
 120 struct PCR_MM_ProcsRep GC_Rep = {
 121         MY_MAGIC,
 122         GC_AllocProc,
 123         GC_ReallocProc,
 124         GC_DummyFreeProc,       /* mmp_free */
 125         GC_FreeProc,            /* mmp_unsafeFree */
 126         GC_EnumerateProc,
 127         GC_DummyShutdownProc    /* mmp_shutdown */
 128 };
 129
 130 struct PCR_MM_ProcsRep GC_DebugRep = {
 131         MY_DEBUGMAGIC,
 132         GC_DebugAllocProc,
 133         GC_DebugReallocProc,
 134         GC_DummyFreeProc,       /* mmp_free */
 135         GC_DebugFreeProc,               /* mmp_unsafeFree */
 136         GC_EnumerateProc,
 137         GC_DummyShutdownProc    /* mmp_shutdown */
 138 };
 139
 140 GC_bool GC_use_debug = 0;
 141
 142 void GC_pcr_install()
 143 {
 144     PCR_MM_Install((GC_use_debug? &GC_DebugRep : &GC_Rep), &GC_old_allocator);
 145 }
 146
 147 PCR_ERes
 148 PCR_GC_Setup(void)
 149 {
 150     return PCR_ERes_okay;
 151 }
 152
 153 PCR_ERes
 154 PCR_GC_Run(void)
 155 {
 156
 157     if( !PCR_Base_TestPCRArg("-nogc") ) {
 158         GC_quiet = ( PCR_Base_TestPCRArg("-gctrace") ? 0 : 1 );
 159         GC_use_debug = (GC_bool)PCR_Base_TestPCRArg("-debug_alloc");
 160         GC_init();
 161         if( !PCR_Base_TestPCRArg("-nogc_incremental") ) {
 162             /*
 163              * awful hack to test whether VD is implemented ...
 164              */
 165             if( PCR_VD_Start( 0, NIL, 0) != PCR_ERes_FromErr(ENOSYS) ) {
 166                 GC_enable_incremental();
 167             }
 168         }
 169     }
 170     return PCR_ERes_okay;
 171 }
 172
 173 # endif