libgc/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 # include "private/gc_priv.h"
  14
  15 # ifdef PCR
  16 /*
  17  * Note that POSIX PCR requires an ANSI C compiler.  Hence we are allowed
  18  * to make the same assumption here.
  19  * We wrap all of the allocator functions to avoid questions of
  20  * compatibility between the prototyped and nonprototyped versions of the f
  21  */
  22 # include "config/PCR_StdTypes.h"
  23 # include "mm/PCR_MM.h"
  24 # include <errno.h>
  25
  26 # define MY_MAGIC 17L
  27 # define MY_DEBUGMAGIC 42L
  28
  29 void * GC_AllocProc(size_t size, PCR_Bool ptrFree, PCR_Bool clear )
  30 {
  31     if (ptrFree) {
  32         void * result = (void *)GC_malloc_atomic(size);
  33         if (clear && result != 0) BZERO(result, size);
  34         return(result);
  35     } else {
  36         return((void *)GC_malloc(size));
  37     }
  38 }
  39
  40 void * GC_DebugAllocProc(size_t size, PCR_Bool ptrFree, PCR_Bool clear )
  41 {
  42     if (ptrFree) {
  43         void * result = (void *)GC_debug_malloc_atomic(size, __FILE__,
  44                                                              __LINE__);
  45         if (clear && result != 0) BZERO(result, size);
  46         return(result);
  47     } else {
  48         return((void *)GC_debug_malloc(size, __FILE__, __LINE__));
  49     }
  50 }
  51
  52 # define GC_ReallocProc GC_realloc
  53 void * GC_DebugReallocProc(void * old_object, size_t new_size_in_bytes)
  54 {
  55     return(GC_debug_realloc(old_object, new_size_in_bytes, __FILE__, __LINE__));
  56 }
  57
  58 # define GC_FreeProc GC_free
  59 # define GC_DebugFreeProc GC_debug_free
  60
  61 typedef struct {
  62   PCR_ERes (*ed_proc)(void *p, size_t size, PCR_Any data);
  63   GC_bool ed_pointerfree;
  64   PCR_ERes ed_fail_code;
  65   PCR_Any ed_client_data;
  66 } enumerate_data;
  67
  68 void GC_enumerate_block(h, ed)
  69 register struct hblk *h;
  70 enumerate_data * ed;
  71 {
  72     register hdr * hhdr;
  73     register int sz;
  74     word *p;
  75     word * lim;
  76
  77     hhdr = HDR(h);
  78     sz = hhdr -> hb_sz;
  79     if (sz >= 0 && ed -> ed_pointerfree
  80         || sz <= 0 && !(ed -> ed_pointerfree)) return;
  81     if (sz < 0) sz = -sz;
  82     lim = (word *)(h+1) - sz;
  83     p = (word *)h;
  84     do {
  85         if (PCR_ERes_IsErr(ed -> ed_fail_code)) return;
  86         ed -> ed_fail_code =
  87             (*(ed -> ed_proc))(p, WORDS_TO_BYTES(sz), ed -> ed_client_data);
  88         p+= sz;
  89     } while (p <= lim);
  90 }
  91
  92 struct PCR_MM_ProcsRep * GC_old_allocator = 0;
  93
  94 PCR_ERes GC_EnumerateProc(
  95     PCR_Bool ptrFree,
  96     PCR_ERes (*proc)(void *p, size_t size, PCR_Any data),
  97     PCR_Any data
  98 )
  99 {
 100     enumerate_data ed;
 101
 102     ed.ed_proc = proc;
 103     ed.ed_pointerfree = ptrFree;
 104     ed.ed_fail_code = PCR_ERes_okay;
 105     ed.ed_client_data = data;
 106     GC_apply_to_all_blocks(GC_enumerate_block, &ed);
 107     if (ed.ed_fail_code != PCR_ERes_okay) {
 108         return(ed.ed_fail_code);
 109     } else {
 110         /* Also enumerate objects allocated by my predecessors */
 111         return((*(GC_old_allocator->mmp_enumerate))(ptrFree, proc, data));
 112     }
 113 }
 114
 115 void GC_DummyFreeProc(void *p) {}
 116
 117 void GC_DummyShutdownProc(void) {}
 118
 119 struct PCR_MM_ProcsRep GC_Rep = {
 120         MY_MAGIC,
 121         GC_AllocProc,
 122         GC_ReallocProc,
 123         GC_DummyFreeProc,       /* mmp_free */
 124         GC_FreeProc,            /* mmp_unsafeFree */
 125         GC_EnumerateProc,
 126         GC_DummyShutdownProc    /* mmp_shutdown */
 127 };
 128
 129 struct PCR_MM_ProcsRep GC_DebugRep = {
 130         MY_DEBUGMAGIC,
 131         GC_DebugAllocProc,
 132         GC_DebugReallocProc,
 133         GC_DummyFreeProc,       /* mmp_free */
 134         GC_DebugFreeProc,               /* mmp_unsafeFree */
 135         GC_EnumerateProc,
 136         GC_DummyShutdownProc    /* mmp_shutdown */
 137 };
 138
 139 GC_bool GC_use_debug = 0;
 140
 141 void GC_pcr_install()
 142 {
 143     PCR_MM_Install((GC_use_debug? &GC_DebugRep : &GC_Rep), &GC_old_allocator);
 144 }
 145
 146 PCR_ERes
 147 PCR_GC_Setup(void)
 148 {
 149     return PCR_ERes_okay;
 150 }
 151
 152 PCR_ERes
 153 PCR_GC_Run(void)
 154 {
 155
 156     if( !PCR_Base_TestPCRArg("-nogc") ) {
 157         GC_quiet = ( PCR_Base_TestPCRArg("-gctrace") ? 0 : 1 );
 158         GC_use_debug = (GC_bool)PCR_Base_TestPCRArg("-debug_alloc");
 159         GC_init();
 160         if( !PCR_Base_TestPCRArg("-nogc_incremental") ) {
 161             /*
 162              * awful hack to test whether VD is implemented ...
 163              */
 164             if( PCR_VD_Start( 0, NIL, 0) != PCR_ERes_FromErr(ENOSYS) ) {
 165                 GC_enable_incremental();
 166             }
 167         }
 168     }
 169     return PCR_ERes_okay;
 170 }
 171
 172 void GC_push_thread_structures(void)
 173 {
 174     /* PCR doesn't work unless static roots are pushed.  Can't get here. */
 175     ABORT("In GC_push_thread_structures()");
 176 }
 177
 178 # endif