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 2592 2005-06-08 11:03:52Z 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 #undef JWDEBUG
  52
  53 /* private functions **********************************************************/
  54
  55 static bool initialize_class_intern(classinfo *c);
  56
  57
  58 /* initialize_class ************************************************************
  59
  60    In Java, every class can have a static initialization
  61    function. This function has to be called BEFORE calling other
  62    methods or accessing static variables.
  63
  64 *******************************************************************************/
  65
  66 bool initialize_class(classinfo *c)
  67 {
  68         bool r;
  69
  70         if (!makeinitializations)
  71                 return true;
  72
  73 #if defined(USE_THREADS)
  74         /* enter a monitor on the class */
  75
  76         builtin_monitorenter((java_objectheader *) c);
  77 #endif
  78
  79         /* maybe the class is already initalized or the current thread, which can
  80            pass the monitor, is currently initalizing this class */
  81
  82         /* JOWENN: In future we need an additinal flag: initializationfailed,
  83                 since further access to the class should cause a NoClassDefFound,
  84                 if the static initializer failed once
  85         */
  86
  87         if (c->initialized || c->initializing) {
  88 #if defined(USE_THREADS)
  89                 builtin_monitorexit((java_objectheader *) c);
  90 #endif
  91
  92                 return true;
  93         }
  94
  95 #ifdef JWDEBUG
  96         printf("preparing to call initialize_class_intern for %s\n",c->name->text);
  97 #endif
  98         /* this initalizing run begins NOW */
  99         c->initializing = true;
 100
 101         /* call the internal function */
 102         r = initialize_class_intern(c);
 103
 104         /* if return value is not NULL everything was ok and the class is
 105            initialized */
 106         if (r)
 107                 c->initialized = true;
 108
 109 #ifdef JWDEBUG
 110         printf("finished to call initialize_class_intern for %s\n",c->name->text);
 111 #endif
 112
 113         /* this initalizing run is done */
 114         c->initializing = false;
 115
 116 #if defined(USE_THREADS)
 117         /* leave the monitor */
 118
 119         builtin_monitorexit((java_objectheader *) c);
 120 #endif
 121
 122         return r;
 123 }
 124
 125
 126 /* initialize_class_intern *****************************************************
 127
 128    This function MUST NOT be called directly, because of thread
 129    <clinit> race conditions.
 130
 131 *******************************************************************************/
 132
 133 static bool initialize_class_intern(classinfo *c)
 134 {
 135         methodinfo        *m;
 136         java_objectheader *xptr;
 137         s4                 i;
 138 #if defined(USE_THREADS) && !defined(NATIVE_THREADS)
 139         int b;
 140 #endif
 141
 142         /* maybe the class is not already linked */
 143
 144         if (!c->linked)
 145                 if (!link_class(c))
 146                         return false;
 147
 148 #if defined(STATISTICS)
 149         if (opt_stat)
 150                 count_class_inits++;
 151 #endif
 152
 153         /* initialize super class */
 154
 155         if (c->super.cls) {
 156                 if (!c->super.cls->initialized) {
 157                         if (initverbose)
 158                                 log_message_class_message_class("Initialize super class ",
 159                                                                                                 c->super.cls,
 160                                                                                                 " from ",
 161                                                                                                 c);
 162
 163 #ifdef JWDEBUG
 164                         printf("preparing to call initialize_class for super  %s\n",c->super.cls->name->text);
 165 #endif
 166                         if (!initialize_class(c->super.cls))
 167                                 return false;
 168                 }
 169         }
 170
 171         /* initialize interface classes */
 172
 173         for (i = 0; i < c->interfacescount; i++) {
 174                 if (!c->interfaces[i].cls->initialized) {
 175 #ifdef JWDEBUG
 176                         printf("preparing to call initialize_class for interface  %s\n",c->interfaces[i].cls->name->text);
 177 #endif
 178                         if (initverbose)
 179                                 log_message_class_message_class("Initialize interface class ",
 180                                                                                                 c->interfaces[i].cls,
 181                                                                                                 " from ",
 182                                                                                                 c);
 183
 184                         if (!initialize_class(c->interfaces[i].cls))
 185                                 return false;
 186                 }
 187         }
 188
 189         m = class_findmethod(c, utf_clinit, utf_void__void);
 190
 191         if (!m) {
 192                 if (initverbose)
 193                         log_message_class("Class has no static class initializer: ", c);
 194
 195                 return true;
 196         }
 197
 198         /* Sun's and IBM's JVM don't care about the static flag */
 199 /*      if (!(m->flags & ACC_STATIC)) { */
 200 /*              log_text("Class initializer is not static!"); */
 201
 202         if (initverbose)
 203                 log_message_class("Starting static class initializer for class: ", c);
 204
 205 #if defined(USE_THREADS) && !defined(NATIVE_THREADS)
 206         b = blockInts;
 207         blockInts = 0;
 208 #endif
 209
 210         /* now call the initializer */
 211
 212         asm_calljavafunction(m, NULL, NULL, NULL, NULL);
 213
 214 #if defined(USE_THREADS) && !defined(NATIVE_THREADS)
 215         assert(blockInts == 0);
 216         blockInts = b;
 217 #endif
 218
 219         /* we have an exception or error */
 220
 221         xptr = *exceptionptr;
 222
 223         if (xptr) {
 224                 /* class is NOT initialized */
 225
 226                 c->initialized = false;
 227
 228                 /* is this an exception, than wrap it */
 229
 230                 if (builtin_instanceof(xptr, class_java_lang_Exception)) {
 231                         /* clear exception, because we are calling jit code again */
 232
 233                         *exceptionptr = NULL;
 234
 235                         /* wrap the exception */
 236
 237                         *exceptionptr =
 238                                 new_exception_throwable(string_java_lang_ExceptionInInitializerError,
 239                                                                                 (java_lang_Throwable *) xptr);
 240                 }
 241
 242                 return false;
 243         }
 244
 245         if (initverbose)
 246                 log_message_class("Finished static class initializer for class: ", c);
 247
 248         return true;
 249 }
 250
 251
 252 /*
 253  * These are local overrides for various environment variables in Emacs.
 254  * Please do not remove this and leave it at the end of the file, where
 255  * Emacs will automagically detect them.
 256  * ---------------------------------------------------------------------
 257  * Local variables:
 258  * mode: c
 259  * indent-tabs-mode: t
 260  * c-basic-offset: 4
 261  * tab-width: 4
 262  * End:
 263  */