src/vm/jit/verify/typecheck-fields.inc

   1 /* src/vm/jit/verify/typecheck-fields.inc - type checking for field ICMDs
   2
   3    Copyright (C) 1996-2005, 2006 R. Grafl, A. Krall, C. Kruegel,
   4    C. Oates, R. Obermaisser, M. Platter, M. Probst, S. Ring,
   5    E. Steiner, C. Thalinger, D. Thuernbeck, P. Tomsich, C. Ullrich,
   6    J. Wenninger, 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., 51 Franklin Street, Fifth Floor, Boston, MA
  23    02110-1301, USA.
  24
  25    Contact: cacao@cacaojvm.org
  26
  27    Authors: Edwin Steiner
  28
  29    Changes:
  30
  31 */
  32
  33
  34 {
  35         unresolved_field *uf;
  36         constant_FMIref *fieldref;
  37         typeinfo *instanceti;
  38         typeinfo *valueti;
  39 #if !defined(TYPECHECK_TYPEINFERER)
  40         resolve_result_t result;
  41 #endif
  42
  43         TYPECHECK_COUNT(stat_ins_field);
  44
  45         instanceti = (instance) ? &(instance->typeinfo) : NULL;
  46         valueti    = (value && value->type == TYPE_ADR) ? &(value->typeinfo) : NULL;
  47
  48         /* get the field reference from the instruction */
  49
  50         if (INSTRUCTION_IS_UNRESOLVED(state->iptr)) {
  51                 uf = state->iptr->sx.s23.s3.uf;
  52                 fieldref = uf->fieldref;
  53         }
  54         else {
  55                 uf = NULL;
  56                 fieldref = state->iptr->sx.s23.s3.fmiref;
  57         }
  58
  59 #if !defined(TYPECHECK_TYPEINFERER)
  60         /* check the basic value type for PUT instructions */
  61
  62         if (value && value->type != fieldref->parseddesc.fd->type)
  63                 VERIFY_ERROR("Field type mismatch");
  64
  65         /* try to resolve the field reference lazily */
  66
  67         result = resolve_field_lazy(state->m, fieldref);
  68
  69         if (result == resolveSucceeded) {
  70                 fieldinfo *fi;
  71
  72                 /* perform verification checks now */
  73
  74                 fi  = fieldref->p.field;
  75
  76                 result = resolve_field_verifier_checks(
  77                                 state->m, fieldref, fi->class, fi,
  78                                 instanceti, valueti,
  79                                 (instance == NULL),
  80                                 (value != NULL));
  81         }
  82
  83         if (result == resolveFailed)
  84                 EXCEPTION;
  85
  86         /* if not resolved, yet, create an unresolved field */
  87
  88         if (result != resolveSucceeded) {
  89                 if (!uf) {
  90                         uf = resolve_create_unresolved_field(state->m->class,
  91                                         state->m, state->iptr);
  92                         if (!uf)
  93                                 EXCEPTION;
  94
  95                         state->iptr->sx.s23.s3.uf = uf;
  96                         state->iptr->flags.bits |= INS_FLAG_UNRESOLVED;
  97                 }
  98
  99                 /* record the subtype constraints for this field access */
 100
 101                 if (!resolve_constrain_unresolved_field(
 102                                         uf, state->m->class, state->m,
 103                                         instanceti, valueti))
 104                         EXCEPTION; /* XXX maybe wrap exception? */
 105
 106                 TYPECHECK_COUNTIF(INSTRUCTION_IS_UNRESOLVED(state->iptr),stat_ins_field_unresolved);
 107                 TYPECHECK_COUNTIF(INSTRUCTION_IS_RESOLVED(state->iptr) &&
 108                                 !state->iptr->sx.s23.s3.fmiref->p.field->class->initialized,
 109                                 stat_ins_field_uninitialized);
 110         }
 111 #endif /* !defined(TYPECHECK_TYPEINFERER) */
 112
 113         /* write the result type */
 114
 115         if (value == NULL) {
 116 #if defined(TYPECHECK_STACKBASED)
 117                 typedescriptor *dv;
 118
 119                 if (IS_2_WORD_TYPE(fieldref->parseddesc.fd->type)) {
 120                         CHECK_STACK_SPACE(2);
 121                         stack += 2;
 122                         dv = &(stack[-1]);
 123                         stack[0].type = TYPE_VOID;
 124                 }
 125                 else {
 126                         CHECK_STACK_SPACE(1);
 127                         stack += 1;
 128                         dv = stack;
 129                 }
 130 #define DST dv
 131 #else
 132 #define DST VAROP(state->iptr->dst)
 133 #endif
 134                 DST->type = fieldref->parseddesc.fd->type;
 135                 if (DST->type == TYPE_ADR) {
 136                         if (!typeinfo_init_from_typedesc(fieldref->parseddesc.fd,NULL,&(DST->typeinfo)))
 137                                 EXCEPTION;
 138                 }
 139 #undef DST
 140         }
 141 }
 142
 143 /*
 144  * These are local overrides for various environment variables in Emacs.
 145  * Please do not remove this and leave it at the end of the file, where
 146  * Emacs will automagically detect them.
 147  * ---------------------------------------------------------------------
 148  * Local variables:
 149  * mode: c
 150  * indent-tabs-mode: t
 151  * c-basic-offset: 4
 152  * tab-width: 4
 153  * End:
 154  * vim:noexpandtab:sw=4:ts=4:filetype=c:
 155  */