src/vm/initialize.c

   1 /* src/vm/initialize.c - static class initializer functions
   2
   3    Copyright (C) 1996-2005 R. Grafl, A. Krall, C. Kruegel, C. Oates,
   4    R. Obermaisser, M. Platter, M. Probst, S. Ring, E. Steiner,
   5    C. Thalinger, D. Thuernbeck, P. Tomsich, C. Ullrich, J. Wenninger,
   6    Institut f. Computersprachen - TU Wien
   7
   8    This file is part of CACAO.
   9
  10    This program is free software; you can redistribute it and/or
  11    modify it under the terms of the GNU General Public License as
  12    published by the Free Software Foundation; either version 2, or (at
  13    your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful, but
  16    WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18    General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program; if not, write to the Free Software
  22    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  23    02111-1307, USA.
  24
  25    Contact: cacao@complang.tuwien.ac.at
  26
  27    Authors: Reinhard Grafl
  28
  29    Changes: Mark Probst
  30             Andreas Krall
  31             Christian Thalinger
  32
  33    $Id: initialize.c 3009 2005-07-12 21:01:36Z twisti $
  34
  35 */
  36
  37
  38 #include <string.h>
  39
  40 #include "vm/global.h"
  41 #include "vm/initialize.h"
  42 #include "vm/builtin.h"
  43 #include "vm/class.h"
  44 #include "vm/loader.h"
  45 #include "vm/exceptions.h"
  46 #include "vm/options.h"
  47 #include "vm/statistics.h"
  48 #include "vm/stringlocal.h"
  49 #include "vm/jit/asmpart.h"
  50
  51
  52 /* private functions **********************************************************/
  53
  54 static bool initialize_class_intern(classinfo *c);
  55
  56
  57 /* initialize_class ************************************************************
  58
  59    In Java, every class can have a static initialization
  60    function. This function has to be called BEFORE calling other
  61    methods or accessing static variables.
  62
  63 *******************************************************************************/
  64
  65 bool initialize_class(classinfo *c)
  66 {
  67         bool r;
  68
  69         if (!makeinitializations)
  70                 return true;
  71
  72 #if defined(USE_THREADS)
  73         /* enter a monitor on the class */
  74
  75         builtin_monitorenter((java_objectheader *) c);
  76 #endif
  77
  78         /* maybe the class is already initalized or the current thread, which can
  79            pass the monitor, is currently initalizing this class */
  80
  81         /* JOWENN: In future we need an additinal flag: initializationfailed,
  82                 since further access to the class should cause a NoClassDefFound,
  83                 if the static initializer failed once
  84         */
  85
  86         if (c->initialized || c->initializing) {
  87 #if defined(USE_THREADS)
  88                 builtin_monitorexit((java_objectheader *) c);
  89 #endif
  90
  91                 return true;
  92         }
  93
  94         /* this initalizing run begins NOW */
  95
  96         c->initializing = true;
  97
  98         /* call the internal function */
  99
 100         r = initialize_class_intern(c);
 101
 102         /* if return value is not NULL everything was ok and the class is */
 103         /* initialized */
 104
 105         if (r)
 106                 c->initialized = true;
 107
 108         /* this initalizing run is done */
 109
 110         c->initializing = false;
 111
 112 #if defined(USE_THREADS)
 113         /* leave the monitor */
 114
 115         builtin_monitorexit((java_objectheader *) c);
 116 #endif
 117
 118         return r;
 119 }
 120
 121
 122 /* initialize_class_intern *****************************************************
 123
 124    This function MUST NOT be called directly, because of thread
 125    <clinit> race conditions.
 126
 127 *******************************************************************************/
 128
 129 static bool initialize_class_intern(classinfo *c)
 130 {
 131         methodinfo        *m;
 132         java_objectheader *xptr;
 133         s4                 i;
 134 #if defined(USE_THREADS) && !defined(NATIVE_THREADS)
 135         int b;
 136 #endif
 137
 138         /* maybe the class is not already linked */
 139
 140         if (!c->linked)
 141                 if (!link_class(c))
 142                         return false;
 143
 144 #if defined(STATISTICS)
 145         if (opt_stat)
 146                 count_class_inits++;
 147 #endif
 148
 149         /* initialize super class */
 150
 151         if (c->super.cls) {
 152                 if (!c->super.cls->initialized) {
 153                         if (initverbose)
 154                                 log_message_class_message_class("Initialize super class ",
 155                                                                                                 c->super.cls,
 156                                                                                                 " from ",
 157                                                                                                 c);
 158
 159                         if (!initialize_class(c->super.cls))
 160                                 return false;
 161                 }
 162         }
 163
 164         /* initialize interface classes */
 165
 166         for (i = 0; i < c->interfacescount; i++) {
 167                 if (!c->interfaces[i].cls->initialized) {
 168                         if (initverbose)
 169                                 log_message_class_message_class("Initialize interface class ",
 170                                                                                                 c->interfaces[i].cls,
 171                                                                                                 " from ",
 172                                                                                                 c);
 173
 174                         if (!initialize_class(c->interfaces[i].cls))
 175                                 return false;
 176                 }
 177         }
 178
 179         m = class_findmethod(c, utf_clinit, utf_void__void);
 180
 181         if (!m) {
 182                 if (initverbose)
 183                         log_message_class("Class has no static class initializer: ", c);
 184
 185                 return true;
 186         }
 187
 188         /* Sun's and IBM's JVM don't care about the static flag */
 189 /*      if (!(m->flags & ACC_STATIC)) { */
 190 /*              log_text("Class initializer is not static!"); */
 191
 192         if (initverbose)
 193                 log_message_class("Starting static class initializer for class: ", c);
 194
 195 #if defined(USE_THREADS) && !defined(NATIVE_THREADS)
 196         b = blockInts;
 197         blockInts = 0;
 198 #endif
 199
 200         /* now call the initializer */
 201
 202         asm_calljavafunction(m, NULL, NULL, NULL, NULL);
 203
 204 #if defined(USE_THREADS) && !defined(NATIVE_THREADS)
 205         assert(blockInts == 0);
 206         blockInts = b;
 207 #endif
 208
 209         /* we have an exception or error */
 210
 211         xptr = *exceptionptr;
 212
 213         if (xptr) {
 214                 /* class is NOT initialized */
 215
 216                 c->initialized = false;
 217
 218                 /* is this an exception, than wrap it */
 219
 220                 if (builtin_instanceof(xptr, class_java_lang_Exception)) {
 221                         /* clear exception, because we are calling jit code again */
 222
 223                         *exceptionptr = NULL;
 224
 225                         /* wrap the exception */
 226
 227                         *exceptionptr =
 228                                 new_exception_throwable(string_java_lang_ExceptionInInitializerError,
 229                                                                                 (java_lang_Throwable *) xptr);
 230                 }
 231
 232                 return false;
 233         }
 234
 235         if (initverbose)
 236                 log_message_class("Finished static class initializer for class: ", c);
 237
 238         return true;
 239 }
 240
 241
 242 /*
 243  * These are local overrides for various environment variables in Emacs.
 244  * Please do not remove this and leave it at the end of the file, where
 245  * Emacs will automagically detect them.
 246  * ---------------------------------------------------------------------
 247  * Local variables:
 248  * mode: c
 249  * indent-tabs-mode: t
 250  * c-basic-offset: 4
 251  * tab-width: 4
 252  * End:
 253  */