gcc/java/expr.c

   1 /* Process expressions for the GNU compiler for the Java(TM) language.
   2    Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
   3    2005, 2006, 2007, 2008, 2010, 2011 Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 3, or (at your option)
  10 any later version.
  11
  12 GCC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.
  20
  21 Java and all Java-based marks are trademarks or registered trademarks
  22 of Sun Microsystems, Inc. in the United States and other countries.
  23 The Free Software Foundation is independent of Sun Microsystems, Inc.  */
  24
  25 /* Hacked by Per Bothner <bothner@cygnus.com> February 1996. */
  26
  27 #include "config.h"
  28 #include "system.h"
  29 #include "coretypes.h"
  30 #include "tm.h"                 /* For INT_TYPE_SIZE,
  31                                    TARGET_VTABLE_USES_DESCRIPTORS,
  32                                    BITS_PER_UNIT,
  33                                    MODIFY_JNI_METHOD_CALL and
  34                                    PARM_BOUNDARY.  */
  35
  36 #include "tree.h"
  37 #include "flags.h"
  38 #include "java-tree.h"
  39 #include "javaop.h"
  40 #include "java-opcodes.h"
  41 #include "jcf.h"
  42 #include "java-except.h"
  43 #include "parse.h"
  44 #include "diagnostic-core.h"
  45 #include "ggc.h"
  46 #include "tree-iterator.h"
  47 #include "target.h"
  48
  49 static void flush_quick_stack (void);
  50 static void push_value (tree);
  51 static tree pop_value (tree);
  52 static void java_stack_swap (void);
  53 static void java_stack_dup (int, int);
  54 static void build_java_athrow (tree);
  55 static void build_java_jsr (int, int);
  56 static void build_java_ret (tree);
  57 static void expand_java_multianewarray (tree, int);
  58 static void expand_java_arraystore (tree);
  59 static void expand_java_arrayload (tree);
  60 static void expand_java_array_length (void);
  61 static tree build_java_monitor (tree, tree);
  62 static void expand_java_pushc (int, tree);
  63 static void expand_java_return (tree);
  64 static void expand_load_internal (int, tree, int);
  65 static void expand_java_NEW (tree);
  66 static void expand_java_INSTANCEOF (tree);
  67 static void expand_java_CHECKCAST (tree);
  68 static void expand_iinc (unsigned int, int, int);
  69 static void expand_java_binop (tree, enum tree_code);
  70 static void note_label (int, int);
  71 static void expand_compare (enum tree_code, tree, tree, int);
  72 static void expand_test (enum tree_code, tree, int);
  73 static void expand_cond (enum tree_code, tree, int);
  74 static void expand_java_goto (int);
  75 static tree expand_java_switch (tree, int);
  76 static void expand_java_add_case (tree, int, int);
  77 static VEC(tree,gc) *pop_arguments (tree);
  78 static void expand_invoke (int, int, int);
  79 static void expand_java_field_op (int, int, int);
  80 static void java_push_constant_from_pool (struct JCF *, int);
  81 static void java_stack_pop (int);
  82 static tree build_java_throw_out_of_bounds_exception (tree);
  83 static tree build_java_check_indexed_type (tree, tree);
  84 static unsigned char peek_opcode_at_pc (struct JCF *, int, int);
  85 static void promote_arguments (void);
  86 static void cache_cpool_data_ref (void);
  87
  88 static GTY(()) tree operand_type[59];
  89
  90 static GTY(()) tree methods_ident;
  91 static GTY(()) tree ncode_ident;
  92 tree dtable_ident = NULL_TREE;
  93
  94 /* Set to nonzero value in order to emit class initialization code
  95    before static field references.  */
  96 int always_initialize_class_p = 0;
  97
  98 /* We store the stack state in two places:
  99    Within a basic block, we use the quick_stack, which is a VEC of expression
 100    nodes.
 101    This is the top part of the stack;  below that we use find_stack_slot.
 102    At the end of a basic block, the quick_stack must be flushed
 103    to the stack slot array (as handled by find_stack_slot).
 104    Using quick_stack generates better code (especially when
 105    compiled without optimization), because we do not have to
 106    explicitly store and load trees to temporary variables.
 107
 108    If a variable is on the quick stack, it means the value of variable
 109    when the quick stack was last flushed.  Conceptually, flush_quick_stack
 110    saves all the quick_stack elements in parallel.  However, that is
 111    complicated, so it actually saves them (i.e. copies each stack value
 112    to is home virtual register) from low indexes.  This allows a quick_stack
 113    element at index i (counting from the bottom of stack the) to references
 114    slot virtuals for register that are >= i, but not those that are deeper.
 115    This convention makes most operations easier.  For example iadd works
 116    even when the stack contains (reg[0], reg[1]):  It results in the
 117    stack containing (reg[0]+reg[1]), which is OK.  However, some stack
 118    operations are more complicated.  For example dup given a stack
 119    containing (reg[0]) would yield (reg[0], reg[0]), which would violate
 120    the convention, since stack value 1 would refer to a register with
 121    lower index (reg[0]), which flush_quick_stack does not safely handle.
 122    So dup cannot just add an extra element to the quick_stack, but iadd can.
 123 */
 124
 125 static GTY(()) VEC(tree,gc) *quick_stack;
 126
 127 /* The physical memory page size used in this computer.  See
 128    build_field_ref().  */
 129 static GTY(()) tree page_size;
 130
 131 /* The stack pointer of the Java virtual machine.
 132    This does include the size of the quick_stack. */
 133
 134 int stack_pointer;
 135
 136 const unsigned char *linenumber_table;
 137 int linenumber_count;
 138
 139 /* Largest pc so far in this method that has been passed to lookup_label. */
 140 int highest_label_pc_this_method = -1;
 141
 142 /* Base value for this method to add to pc to get generated label. */
 143 int start_label_pc_this_method = 0;
 144
 145 void
 146 init_expr_processing (void)
 147 {
 148   operand_type[21] = operand_type[54] = int_type_node;
 149   operand_type[22] = operand_type[55] = long_type_node;
 150   operand_type[23] = operand_type[56] = float_type_node;
 151   operand_type[24] = operand_type[57] = double_type_node;
 152   operand_type[25] = operand_type[58] = ptr_type_node;
 153 }
 154
 155 tree
 156 java_truthvalue_conversion (tree expr)
 157 {
 158   /* It is simpler and generates better code to have only TRUTH_*_EXPR
 159      or comparison expressions as truth values at this level.
 160
 161      This function should normally be identity for Java.  */
 162
 163   switch (TREE_CODE (expr))
 164     {
 165     case EQ_EXPR:   case NE_EXPR:   case UNEQ_EXPR: case LTGT_EXPR:
 166     case LE_EXPR:   case GE_EXPR:   case LT_EXPR:   case GT_EXPR:
 167     case UNLE_EXPR: case UNGE_EXPR: case UNLT_EXPR: case UNGT_EXPR:
 168     case ORDERED_EXPR: case UNORDERED_EXPR:
 169     case TRUTH_ANDIF_EXPR:
 170     case TRUTH_ORIF_EXPR:
 171     case TRUTH_AND_EXPR:
 172     case TRUTH_OR_EXPR:
 173     case TRUTH_XOR_EXPR:
 174     case TRUTH_NOT_EXPR:
 175     case ERROR_MARK:
 176       return expr;
 177
 178     case INTEGER_CST:
 179       return integer_zerop (expr) ? boolean_false_node : boolean_true_node;
 180
 181     case REAL_CST:
 182       return real_zerop (expr) ? boolean_false_node : boolean_true_node;
 183
 184     /* are these legal? XXX JH */
 185     case NEGATE_EXPR:
 186     case ABS_EXPR:
 187     case FLOAT_EXPR:
 188       /* These don't change whether an object is nonzero or zero.  */
 189       return java_truthvalue_conversion (TREE_OPERAND (expr, 0));
 190
 191     case COND_EXPR:
 192       /* Distribute the conversion into the arms of a COND_EXPR.  */
 193       return fold_build3 (COND_EXPR, boolean_type_node, TREE_OPERAND (expr, 0),
 194                           java_truthvalue_conversion (TREE_OPERAND (expr, 1)),
 195                           java_truthvalue_conversion (TREE_OPERAND (expr, 2)));
 196
 197     case NOP_EXPR:
 198       /* If this is widening the argument, we can ignore it.  */
 199       if (TYPE_PRECISION (TREE_TYPE (expr))
 200           >= TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (expr, 0))))
 201         return java_truthvalue_conversion (TREE_OPERAND (expr, 0));
 202       /* fall through to default */
 203
 204     default:
 205       return fold_build2 (NE_EXPR, boolean_type_node,
 206                           expr, boolean_false_node);
 207     }
 208 }
 209
 210 /* Save any stack slots that happen to be in the quick_stack into their
 211    home virtual register slots.
 212
 213    The copy order is from low stack index to high, to support the invariant
 214    that the expression for a slot may contain decls for stack slots with
 215    higher (or the same) index, but not lower. */
 216
 217 static void
 218 flush_quick_stack (void)
 219 {
 220   int stack_index = stack_pointer;
 221   unsigned ix;
 222   tree t;
 223
 224   /* Count the number of slots the quick stack is holding.  */
 225   for (ix = 0; VEC_iterate(tree, quick_stack, ix, t); ix++)
 226     stack_index -= 1 + TYPE_IS_WIDE (TREE_TYPE (t));
 227
 228   for (ix = 0; VEC_iterate(tree, quick_stack, ix, t); ix++)
 229     {
 230       tree decl, type = TREE_TYPE (t);
 231
 232       decl = find_stack_slot (stack_index, type);
 233       if (decl != t)
 234         java_add_stmt (build2 (MODIFY_EXPR, TREE_TYPE (t), decl, t));
 235       stack_index += 1 + TYPE_IS_WIDE (type);
 236     }
 237
 238   VEC_truncate (tree, quick_stack, 0);
 239 }
 240
 241 /* Push TYPE on the type stack.
 242    Return true on success, 0 on overflow. */
 243
 244 int
 245 push_type_0 (tree type)
 246 {
 247   int n_words;
 248   type = promote_type (type);
 249   n_words = 1 + TYPE_IS_WIDE (type);
 250   if (stack_pointer + n_words > DECL_MAX_STACK (current_function_decl))
 251     return 0;
 252   /* Allocate decl for this variable now, so we get a temporary that
 253      survives the whole method. */
 254   find_stack_slot (stack_pointer, type);
 255   stack_type_map[stack_pointer++] = type;
 256   n_words--;
 257   while (--n_words >= 0)
 258     stack_type_map[stack_pointer++] = TYPE_SECOND;
 259   return 1;
 260 }
 261
 262 void
 263 push_type (tree type)
 264 {
 265   int r = push_type_0 (type);
 266   gcc_assert (r);
 267 }
 268
 269 static void
 270 push_value (tree value)
 271 {
 272   tree type = TREE_TYPE (value);
 273   if (TYPE_PRECISION (type) < 32 && INTEGRAL_TYPE_P (type))
 274     {
 275       type = promote_type (type);
 276       value = convert (type, value);
 277     }
 278   push_type (type);
 279   VEC_safe_push (tree, gc, quick_stack, value);
 280
 281   /* If the value has a side effect, then we need to evaluate it
 282      whether or not the result is used.  If the value ends up on the
 283      quick stack and is then popped, this won't happen -- so we flush
 284      the quick stack.  It is safest to simply always flush, though,
 285      since TREE_SIDE_EFFECTS doesn't capture COMPONENT_REF, and for
 286      the latter we may need to strip conversions.  */
 287   flush_quick_stack ();
 288 }
 289
 290 /* Pop a type from the type stack.
 291    TYPE is the expected type.   Return the actual type, which must be
 292    convertible to TYPE.
 293    On an error, *MESSAGEP is set to a freshly malloc'd error message. */
 294
 295 tree
 296 pop_type_0 (tree type, char **messagep)
 297 {
 298   int n_words;
 299   tree t;
 300   *messagep = NULL;
 301   if (TREE_CODE (type) == RECORD_TYPE)
 302     type = promote_type (type);
 303   n_words = 1 + TYPE_IS_WIDE (type);
 304   if (stack_pointer < n_words)
 305     {
 306       *messagep = xstrdup ("stack underflow");
 307       return type;
 308     }
 309   while (--n_words > 0)
 310     {
 311       if (stack_type_map[--stack_pointer] != void_type_node)
 312         {
 313           *messagep = xstrdup ("Invalid multi-word value on type stack");
 314           return type;
 315         }
 316     }
 317   t = stack_type_map[--stack_pointer];
 318   if (type == NULL_TREE || t == type)
 319     return t;
 320   if (TREE_CODE (t) == TREE_LIST)
 321     {
 322       do
 323         {
 324           tree tt = TREE_PURPOSE (t);
 325           if (! can_widen_reference_to (tt, type))
 326             {
 327               t = tt;
 328               goto fail;
 329             }
 330           t = TREE_CHAIN (t);
 331         }
 332       while (t);
 333       return t;
 334     }
 335   if (INTEGRAL_TYPE_P (type) && INTEGRAL_TYPE_P (t)
 336       && TYPE_PRECISION (type) <= 32 && TYPE_PRECISION (t) <= 32)
 337     return t;
 338   if (TREE_CODE (type) == POINTER_TYPE && TREE_CODE (t) == POINTER_TYPE)
 339     {
 340       /* If the expected type we've been passed is object or ptr
 341          (i.e. void*), the caller needs to know the real type.  */
 342       if (type == ptr_type_node || type == object_ptr_type_node)
 343         return t;
 344
 345       /* Since the verifier has already run, we know that any
 346          types we see will be compatible.  In BC mode, this fact
 347          may be checked at runtime, but if that is so then we can
 348          assume its truth here as well.  So, we always succeed
 349          here, with the expected type.  */
 350       return type;
 351     }
 352
 353   if (! flag_verify_invocations && flag_indirect_dispatch
 354       && t == object_ptr_type_node)
 355     {
 356       if (type != ptr_type_node)
 357         warning (0, "need to insert runtime check for %s",
 358                  xstrdup (lang_printable_name (type, 0)));
 359       return type;
 360     }
 361
 362   /* lang_printable_name uses a static buffer, so we must save the result
 363      from calling it the first time.  */
 364  fail:
 365   {
 366     char *temp = xstrdup (lang_printable_name (type, 0));
 367     /* If the stack contains a multi-word type, keep popping the stack until
 368        the real type is found.  */
 369     while (t == void_type_node)
 370       t = stack_type_map[--stack_pointer];
 371     *messagep = concat ("expected type '", temp,
 372                         "' but stack contains '", lang_printable_name (t, 0),
 373                         "'", NULL);
 374     free (temp);
 375   }
 376   return type;
 377 }
 378
 379 /* Pop a type from the type stack.
 380    TYPE is the expected type.  Return the actual type, which must be
 381    convertible to TYPE, otherwise call error. */
 382
 383 tree
 384 pop_type (tree type)
 385 {
 386   char *message = NULL;
 387   type = pop_type_0 (type, &message);
 388   if (message != NULL)
 389     {
 390       error ("%s", message);
 391       free (message);
 392     }
 393   return type;
 394 }
 395
 396 \f
 397 /* Return true if two type assertions are equal.  */
 398
 399 static int
 400 type_assertion_eq (const void * k1_p, const void * k2_p)
 401 {
 402   const type_assertion k1 = *(const type_assertion *)k1_p;
 403   const type_assertion k2 = *(const type_assertion *)k2_p;
 404   return (k1.assertion_code == k2.assertion_code
 405           && k1.op1 == k2.op1
 406           && k1.op2 == k2.op2);
 407 }
 408
 409 /* Hash a type assertion.  */
 410
 411 static hashval_t
 412 type_assertion_hash (const void *p)
 413 {
 414   const type_assertion *k_p = (const type_assertion *) p;
 415   hashval_t hash = iterative_hash (&k_p->assertion_code, sizeof
 416                                    k_p->assertion_code, 0);
 417
 418   switch (k_p->assertion_code)
 419     {
 420     case JV_ASSERT_TYPES_COMPATIBLE:
 421       hash = iterative_hash (&TYPE_UID (k_p->op2), sizeof TYPE_UID (k_p->op2),
 422                              hash);
 423       /* Fall through.  */
 424
 425     case JV_ASSERT_IS_INSTANTIABLE:
 426       hash = iterative_hash (&TYPE_UID (k_p->op1), sizeof TYPE_UID (k_p->op1),
 427                              hash);
 428       /* Fall through.  */
 429
 430     case JV_ASSERT_END_OF_TABLE:
 431       break;
 432
 433     default:
 434       gcc_unreachable ();
 435     }
 436
 437   return hash;
 438 }
 439
 440 /* Add an entry to the type assertion table for the given class.
 441    KLASS is the class for which this assertion will be evaluated by the
 442    runtime during loading/initialization.
 443    ASSERTION_CODE is the 'opcode' or type of this assertion: see java-tree.h.
 444    OP1 and OP2 are the operands. The tree type of these arguments may be
 445    specific to each assertion_code. */
 446
 447 void
 448 add_type_assertion (tree klass, int assertion_code, tree op1, tree op2)
 449 {
 450   htab_t assertions_htab;
 451   type_assertion as;
 452   void **as_pp;
 453
 454   assertions_htab = TYPE_ASSERTIONS (klass);
 455   if (assertions_htab == NULL)
 456     {
 457       assertions_htab = htab_create_ggc (7, type_assertion_hash,
 458                                          type_assertion_eq, NULL);
 459       TYPE_ASSERTIONS (current_class) = assertions_htab;
 460     }
 461
 462   as.assertion_code = assertion_code;
 463   as.op1 = op1;
 464   as.op2 = op2;
 465
 466   as_pp = htab_find_slot (assertions_htab, &as, INSERT);
 467
 468   /* Don't add the same assertion twice.  */
 469   if (*as_pp)
 470     return;
 471
 472   *as_pp = ggc_alloc_type_assertion ();
 473   **(type_assertion **)as_pp = as;
 474 }
 475
 476 \f
 477 /* Return 1 if SOURCE_TYPE can be safely widened to TARGET_TYPE.
 478    Handles array types and interfaces.  */
 479
 480 int
 481 can_widen_reference_to (tree source_type, tree target_type)
 482 {
 483   if (source_type == ptr_type_node || target_type == object_ptr_type_node)
 484     return 1;
 485
 486   /* Get rid of pointers  */
 487   if (TREE_CODE (source_type) == POINTER_TYPE)
 488     source_type = TREE_TYPE (source_type);
 489   if (TREE_CODE (target_type) == POINTER_TYPE)
 490     target_type = TREE_TYPE (target_type);
 491
 492   if (source_type == target_type)
 493     return 1;
 494
 495   /* FIXME: This is very pessimistic, in that it checks everything,
 496      even if we already know that the types are compatible.  If we're
 497      to support full Java class loader semantics, we need this.
 498      However, we could do something more optimal.  */
 499   if (! flag_verify_invocations)
 500     {
 501       add_type_assertion (current_class, JV_ASSERT_TYPES_COMPATIBLE,
 502                           source_type, target_type);
 503
 504       if (!quiet_flag)
 505        warning (0, "assert: %s is assign compatible with %s",
 506                 xstrdup (lang_printable_name (target_type, 0)),
 507                 xstrdup (lang_printable_name (source_type, 0)));
 508       /* Punt everything to runtime.  */
 509       return 1;
 510     }
 511
 512   if (TYPE_DUMMY (source_type) || TYPE_DUMMY (target_type))
 513     {
 514       return 1;
 515     }
 516   else
 517     {
 518       if (TYPE_ARRAY_P (source_type) || TYPE_ARRAY_P (target_type))
 519         {
 520           HOST_WIDE_INT source_length, target_length;
 521           if (TYPE_ARRAY_P (source_type) != TYPE_ARRAY_P (target_type))
 522             {
 523               /* An array implements Cloneable and Serializable.  */
 524               tree name = DECL_NAME (TYPE_NAME (target_type));
 525               return (name == java_lang_cloneable_identifier_node
 526                       || name == java_io_serializable_identifier_node);
 527             }
 528           target_length = java_array_type_length (target_type);
 529           if (target_length >= 0)
 530             {
 531               source_length = java_array_type_length (source_type);
 532               if (source_length != target_length)
 533                 return 0;
 534             }
 535           source_type = TYPE_ARRAY_ELEMENT (source_type);
 536           target_type = TYPE_ARRAY_ELEMENT (target_type);
 537           if (source_type == target_type)
 538             return 1;
 539           if (TREE_CODE (source_type) != POINTER_TYPE
 540               || TREE_CODE (target_type) != POINTER_TYPE)
 541             return 0;
 542           return can_widen_reference_to (source_type, target_type);
 543         }
 544       else
 545         {
 546           int source_depth = class_depth (source_type);
 547           int target_depth = class_depth (target_type);
 548
 549           if (TYPE_DUMMY (source_type) || TYPE_DUMMY (target_type))
 550             {
 551               if (! quiet_flag)
 552                 warning (0, "assert: %s is assign compatible with %s",
 553                          xstrdup (lang_printable_name (target_type, 0)),
 554                          xstrdup (lang_printable_name (source_type, 0)));
 555               return 1;
 556             }
 557
 558           /* class_depth can return a negative depth if an error occurred */
 559           if (source_depth < 0 || target_depth < 0)
 560             return 0;
 561
 562           if (CLASS_INTERFACE (TYPE_NAME (target_type)))
 563             {
 564               /* target_type is OK if source_type or source_type ancestors
 565                  implement target_type. We handle multiple sub-interfaces  */
 566               tree binfo, base_binfo;
 567               int i;
 568
 569               for (binfo = TYPE_BINFO (source_type), i = 0;
 570                    BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
 571                 if (can_widen_reference_to
 572                     (BINFO_TYPE (base_binfo), target_type))
 573                   return 1;
 574
 575               if (!i)
 576                 return 0;
 577             }
 578
 579           for ( ; source_depth > target_depth;  source_depth--)
 580             {
 581               source_type
 582                 = BINFO_TYPE (BINFO_BASE_BINFO (TYPE_BINFO (source_type), 0));
 583             }
 584           return source_type == target_type;
 585         }
 586     }
 587 }
 588
 589 static tree
 590 pop_value (tree type)
 591 {
 592   type = pop_type (type);
 593   if (VEC_length (tree, quick_stack) != 0)
 594     return VEC_pop (tree, quick_stack);
 595   else
 596     return find_stack_slot (stack_pointer, promote_type (type));
 597 }
 598
 599
 600 /* Pop and discard the top COUNT stack slots. */
 601
 602 static void
 603 java_stack_pop (int count)
 604 {
 605   while (count > 0)
 606     {
 607       tree type;
 608
 609       gcc_assert (stack_pointer != 0);
 610
 611       type = stack_type_map[stack_pointer - 1];
 612       if (type == TYPE_SECOND)
 613         {
 614           count--;
 615           gcc_assert (stack_pointer != 1 && count > 0);
 616
 617           type = stack_type_map[stack_pointer - 2];
 618         }
 619       pop_value (type);
 620       count--;
 621     }
 622 }
 623
 624 /* Implement the 'swap' operator (to swap two top stack slots). */
 625
 626 static void
 627 java_stack_swap (void)
 628 {
 629   tree type1, type2;
 630   tree temp;
 631   tree decl1, decl2;
 632
 633   if (stack_pointer < 2
 634       || (type1 = stack_type_map[stack_pointer - 1]) == TYPE_SECOND
 635       || (type2 = stack_type_map[stack_pointer - 2]) == TYPE_SECOND
 636       || TYPE_IS_WIDE (type1) || TYPE_IS_WIDE (type2))
 637     /* Bad stack swap.  */
 638     abort ();
 639   /* Bad stack swap.  */
 640
 641   flush_quick_stack ();
 642   decl1 = find_stack_slot (stack_pointer - 1, type1);
 643   decl2 = find_stack_slot (stack_pointer - 2, type2);
 644   temp = build_decl (input_location, VAR_DECL, NULL_TREE, type1);
 645   java_add_local_var (temp);
 646   java_add_stmt (build2 (MODIFY_EXPR, type1, temp, decl1));
 647   java_add_stmt (build2 (MODIFY_EXPR, type2,
 648                          find_stack_slot (stack_pointer - 1, type2),
 649                          decl2));
 650   java_add_stmt (build2 (MODIFY_EXPR, type1,
 651                          find_stack_slot (stack_pointer - 2, type1),
 652                          temp));
 653   stack_type_map[stack_pointer - 1] = type2;
 654   stack_type_map[stack_pointer - 2] = type1;
 655 }
 656
 657 static void
 658 java_stack_dup (int size, int offset)
 659 {
 660   int low_index = stack_pointer - size - offset;
 661   int dst_index;
 662   if (low_index < 0)
 663     error ("stack underflow - dup* operation");
 664
 665   flush_quick_stack ();
 666
 667   stack_pointer += size;
 668   dst_index = stack_pointer;
 669
 670   for (dst_index = stack_pointer;  --dst_index >= low_index; )
 671     {
 672       tree type;
 673       int src_index = dst_index - size;
 674       if (src_index < low_index)
 675         src_index = dst_index + size + offset;
 676       type = stack_type_map [src_index];
 677       if (type == TYPE_SECOND)
 678         {
 679           /* Dup operation splits 64-bit number.  */
 680           gcc_assert (src_index > low_index);
 681
 682           stack_type_map[dst_index] = type;
 683           src_index--;  dst_index--;
 684           type = stack_type_map[src_index];
 685           gcc_assert (TYPE_IS_WIDE (type));
 686         }
 687       else
 688         gcc_assert (! TYPE_IS_WIDE (type));
 689
 690       if (src_index != dst_index)
 691         {
 692           tree src_decl = find_stack_slot (src_index, type);
 693           tree dst_decl = find_stack_slot (dst_index, type);
 694
 695           java_add_stmt
 696             (build2 (MODIFY_EXPR, TREE_TYPE (dst_decl), dst_decl, src_decl));
 697           stack_type_map[dst_index] = type;
 698         }
 699     }
 700 }
 701
 702 /* Calls _Jv_Throw or _Jv_Sjlj_Throw.  Discard the contents of the
 703    value stack. */
 704
 705 static void
 706 build_java_athrow (tree node)
 707 {
 708   tree call;
 709
 710   call = build_call_nary (void_type_node,
 711                           build_address_of (throw_node),
 712                           1, node);
 713   TREE_SIDE_EFFECTS (call) = 1;
 714   java_add_stmt (call);
 715   java_stack_pop (stack_pointer);
 716 }
 717
 718 /* Implementation for jsr/ret */
 719
 720 static void
 721 build_java_jsr (int target_pc, int return_pc)
 722 {
 723   tree where =  lookup_label (target_pc);
 724   tree ret = lookup_label (return_pc);
 725   tree ret_label = fold_build1 (ADDR_EXPR, return_address_type_node, ret);
 726   push_value (ret_label);
 727   flush_quick_stack ();
 728   java_add_stmt (build1 (GOTO_EXPR, void_type_node, where));
 729
 730   /* Do not need to emit the label here.  We noted the existence of the
 731      label as a jump target in note_instructions; we'll emit the label
 732      for real at the beginning of the expand_byte_code loop.  */
 733 }
 734
 735 static void
 736 build_java_ret (tree location)
 737 {
 738   java_add_stmt (build1 (GOTO_EXPR, void_type_node, location));
 739 }
 740
 741 /* Implementation of operations on array: new, load, store, length */
 742
 743 tree
 744 decode_newarray_type (int atype)
 745 {
 746   switch (atype)
 747     {
 748     case 4:  return boolean_type_node;
 749     case 5:  return char_type_node;
 750     case 6:  return float_type_node;
 751     case 7:  return double_type_node;
 752     case 8:  return byte_type_node;
 753     case 9:  return short_type_node;
 754     case 10: return int_type_node;
 755     case 11: return long_type_node;
 756     default: return NULL_TREE;
 757     }
 758 }
 759
 760 /* Map primitive type to the code used by OPCODE_newarray. */
 761
 762 int
 763 encode_newarray_type (tree type)
 764 {
 765   if (type == boolean_type_node)
 766     return 4;
 767   else if (type == char_type_node)
 768     return 5;
 769   else if (type == float_type_node)
 770     return 6;
 771   else if (type == double_type_node)
 772     return 7;
 773   else if (type == byte_type_node)
 774     return 8;
 775   else if (type == short_type_node)
 776     return 9;
 777   else if (type == int_type_node)
 778     return 10;
 779   else if (type == long_type_node)
 780     return 11;
 781   else
 782     gcc_unreachable ();
 783 }
 784
 785 /* Build a call to _Jv_ThrowBadArrayIndex(), the
 786    ArrayIndexOfBoundsException exception handler.  */
 787
 788 static tree
 789 build_java_throw_out_of_bounds_exception (tree index)
 790 {
 791   tree node;
 792
 793   /* We need to build a COMPOUND_EXPR because _Jv_ThrowBadArrayIndex()
 794      has void return type.  We cannot just set the type of the CALL_EXPR below
 795      to int_type_node because we would lose it during gimplification.  */
 796   gcc_assert (VOID_TYPE_P (TREE_TYPE (TREE_TYPE (soft_badarrayindex_node))));
 797   node = build_call_nary (void_type_node,
 798                                build_address_of (soft_badarrayindex_node),
 799                                1, index);
 800   TREE_SIDE_EFFECTS (node) = 1;
 801
 802   node = build2 (COMPOUND_EXPR, int_type_node, node, integer_zero_node);
 803   TREE_SIDE_EFFECTS (node) = 1; /* Allows expansion within ANDIF */
 804
 805   return (node);
 806 }
 807
 808 /* Return the length of an array. Doesn't perform any checking on the nature
 809    or value of the array NODE. May be used to implement some bytecodes.  */
 810
 811 tree
 812 build_java_array_length_access (tree node)
 813 {
 814   tree type = TREE_TYPE (node);
 815   tree array_type = TREE_TYPE (type);
 816   HOST_WIDE_INT length;
 817
 818   if (!is_array_type_p (type))
 819     {
 820       /* With the new verifier, we will see an ordinary pointer type
 821          here.  In this case, we just use an arbitrary array type.  */
 822       array_type = build_java_array_type (object_ptr_type_node, -1);
 823       type = promote_type (array_type);
 824     }
 825
 826   length = java_array_type_length (type);
 827   if (length >= 0)
 828     return build_int_cst (NULL_TREE, length);
 829
 830   node = build3 (COMPONENT_REF, int_type_node,
 831                  build_java_indirect_ref (array_type, node,
 832                                           flag_check_references),
 833                  lookup_field (&array_type, get_identifier ("length")),
 834                  NULL_TREE);
 835   IS_ARRAY_LENGTH_ACCESS (node) = 1;
 836   return node;
 837 }
 838
 839 /* Optionally checks a reference against the NULL pointer.  ARG1: the
 840    expr, ARG2: we should check the reference.  Don't generate extra
 841    checks if we're not generating code.  */
 842
 843 tree
 844 java_check_reference (tree expr, int check)
 845 {
 846   if (!flag_syntax_only && check)
 847     {
 848       expr = save_expr (expr);
 849       expr = build3 (COND_EXPR, TREE_TYPE (expr),
 850                      build2 (EQ_EXPR, boolean_type_node,
 851                              expr, null_pointer_node),
 852                      build_call_nary (void_type_node,
 853                                       build_address_of (soft_nullpointer_node),
 854                                       0),
 855                      expr);
 856     }
 857
 858   return expr;
 859 }
 860
 861 /* Reference an object: just like an INDIRECT_REF, but with checking.  */
 862
 863 tree
 864 build_java_indirect_ref (tree type, tree expr, int check)
 865 {
 866   tree t;
 867   t = java_check_reference (expr, check);
 868   t = convert (build_pointer_type (type), t);
 869   return build1 (INDIRECT_REF, type, t);
 870 }
 871
 872 /* Implement array indexing (either as l-value or r-value).
 873    Returns a tree for ARRAY[INDEX], assume TYPE is the element type.
 874    Optionally performs bounds checking and/or test to NULL.
 875    At this point, ARRAY should have been verified as an array.  */
 876
 877 tree
 878 build_java_arrayaccess (tree array, tree type, tree index)
 879 {
 880   tree node, throw_expr = NULL_TREE;
 881   tree data_field;
 882   tree ref;
 883   tree array_type = TREE_TYPE (TREE_TYPE (array));
 884   tree size_exp = fold_convert (sizetype, size_in_bytes (type));
 885
 886   if (!is_array_type_p (TREE_TYPE (array)))
 887     {
 888       /* With the new verifier, we will see an ordinary pointer type
 889          here.  In this case, we just use the correct array type.  */
 890       array_type = build_java_array_type (type, -1);
 891     }
 892
 893   if (flag_bounds_check)
 894     {
 895       /* Generate:
 896        * (unsigned jint) INDEX >= (unsigned jint) LEN
 897        *    && throw ArrayIndexOutOfBoundsException.
 898        * Note this is equivalent to and more efficient than:
 899        * INDEX < 0 || INDEX >= LEN && throw ... */
 900       tree test;
 901       tree len = convert (unsigned_int_type_node,
 902                           build_java_array_length_access (array));
 903       test = fold_build2 (GE_EXPR, boolean_type_node,
 904                           convert (unsigned_int_type_node, index),
 905                           len);
 906       if (! integer_zerop (test))
 907         {
 908           throw_expr
 909             = build2 (TRUTH_ANDIF_EXPR, int_type_node, test,
 910                       build_java_throw_out_of_bounds_exception (index));
 911           /* allows expansion within COMPOUND */
 912           TREE_SIDE_EFFECTS( throw_expr ) = 1;
 913         }
 914     }
 915
 916   /* If checking bounds, wrap the index expr with a COMPOUND_EXPR in order
 917      to have the bounds check evaluated first. */
 918   if (throw_expr != NULL_TREE)
 919     index = build2 (COMPOUND_EXPR, int_type_node, throw_expr, index);
 920
 921   data_field = lookup_field (&array_type, get_identifier ("data"));
 922
 923   ref = build3 (COMPONENT_REF, TREE_TYPE (data_field),
 924                 build_java_indirect_ref (array_type, array,
 925                                          flag_check_references),
 926                 data_field, NULL_TREE);
 927
 928   /* Take the address of the data field and convert it to a pointer to
 929      the element type.  */
 930   node = build1 (NOP_EXPR, build_pointer_type (type), build_address_of (ref));
 931
 932   /* Multiply the index by the size of an element to obtain a byte
 933      offset.  Convert the result to a pointer to the element type.  */
 934   index = build2 (MULT_EXPR, sizetype,
 935                   fold_convert (sizetype, index),
 936                   size_exp);
 937
 938   /* Sum the byte offset and the address of the data field.  */
 939   node = fold_build_pointer_plus (node, index);
 940
 941   /* Finally, return
 942
 943     *((&array->data) + index*size_exp)
 944
 945   */
 946   return build1 (INDIRECT_REF, TREE_TYPE (TREE_TYPE (node)), node);
 947 }
 948
 949 /* Generate code to throw an ArrayStoreException if OBJECT is not assignable
 950    (at runtime) to an element of ARRAY.  A NOP_EXPR is returned if it can
 951    determine that no check is required. */
 952
 953 tree
 954 build_java_arraystore_check (tree array, tree object)
 955 {
 956   tree check, element_type, source;
 957   tree array_type_p = TREE_TYPE (array);
 958   tree object_type = TYPE_NAME (TREE_TYPE (TREE_TYPE (object)));
 959
 960   if (! flag_verify_invocations)
 961     {
 962       /* With the new verifier, we don't track precise types.  FIXME:
 963          performance regression here.  */
 964       element_type = TYPE_NAME (object_type_node);
 965     }
 966   else
 967     {
 968       gcc_assert (is_array_type_p (array_type_p));
 969
 970       /* Get the TYPE_DECL for ARRAY's element type. */
 971       element_type
 972         = TYPE_NAME (TREE_TYPE (TREE_TYPE (TREE_TYPE (array_type_p))));
 973     }
 974
 975   gcc_assert (TREE_CODE (element_type) == TYPE_DECL
 976               && TREE_CODE (object_type) == TYPE_DECL);
 977
 978   if (!flag_store_check)
 979     return build1 (NOP_EXPR, array_type_p, array);
 980
 981   /* No check is needed if the element type is final.  Also check that
 982      element_type matches object_type, since in the bytecode
 983      compilation case element_type may be the actual element type of
 984      the array rather than its declared type.  However, if we're doing
 985      indirect dispatch, we can't do the `final' optimization.  */
 986   if (element_type == object_type
 987       && ! flag_indirect_dispatch
 988       && CLASS_FINAL (element_type))
 989     return build1 (NOP_EXPR, array_type_p, array);
 990
 991   /* OBJECT might be wrapped by a SAVE_EXPR. */
 992   if (TREE_CODE (object) == SAVE_EXPR)
 993     source = TREE_OPERAND (object, 0);
 994   else
 995     source = object;
 996
 997   /* Avoid the check if OBJECT was just loaded from the same array. */
 998   if (TREE_CODE (source) == ARRAY_REF)
 999     {
1000       tree target;
1001       source = TREE_OPERAND (source, 0); /* COMPONENT_REF. */
1002       source = TREE_OPERAND (source, 0); /* INDIRECT_REF. */
1003       source = TREE_OPERAND (source, 0); /* Source array's DECL or SAVE_EXPR. */
1004       if (TREE_CODE (source) == SAVE_EXPR)
1005         source = TREE_OPERAND (source, 0);
1006
1007       target = array;
1008       if (TREE_CODE (target) == SAVE_EXPR)
1009         target = TREE_OPERAND (target, 0);
1010
1011       if (source == target)
1012         return build1 (NOP_EXPR, array_type_p, array);
1013     }
1014
1015   /* Build an invocation of _Jv_CheckArrayStore */
1016   check = build_call_nary (void_type_node,
1017                            build_address_of (soft_checkarraystore_node),
1018                            2, array, object);
1019   TREE_SIDE_EFFECTS (check) = 1;
1020
1021   return check;
1022 }
1023
1024 /* Makes sure that INDEXED_TYPE is appropriate. If not, make it from
1025    ARRAY_NODE. This function is used to retrieve something less vague than
1026    a pointer type when indexing the first dimension of something like [[<t>.
1027    May return a corrected type, if necessary, otherwise INDEXED_TYPE is
1028    return unchanged.  */
1029
1030 static tree
1031 build_java_check_indexed_type (tree array_node ATTRIBUTE_UNUSED,
1032                                tree indexed_type)
1033 {
1034   /* We used to check to see if ARRAY_NODE really had array type.
1035      However, with the new verifier, this is not necessary, as we know
1036      that the object will be an array of the appropriate type.  */
1037
1038   return indexed_type;
1039 }
1040
1041 /* newarray triggers a call to _Jv_NewPrimArray. This function should be
1042    called with an integer code (the type of array to create), and the length
1043    of the array to create.  */
1044
1045 tree
1046 build_newarray (int atype_value, tree length)
1047 {
1048   tree type_arg;
1049
1050   tree prim_type = decode_newarray_type (atype_value);
1051   tree type
1052     = build_java_array_type (prim_type,
1053                              host_integerp (length, 0) == INTEGER_CST
1054                              ? tree_low_cst (length, 0) : -1);
1055
1056   /* Pass a reference to the primitive type class and save the runtime
1057      some work.  */
1058   type_arg = build_class_ref (prim_type);
1059
1060   return build_call_nary (promote_type (type),
1061                           build_address_of (soft_newarray_node),
1062                           2, type_arg, length);
1063 }
1064
1065 /* Generates anewarray from a given CLASS_TYPE. Gets from the stack the size
1066    of the dimension. */
1067
1068 tree
1069 build_anewarray (tree class_type, tree length)
1070 {
1071   tree type
1072     = build_java_array_type (class_type,
1073                              host_integerp (length, 0)
1074                              ? tree_low_cst (length, 0) : -1);
1075
1076   return build_call_nary (promote_type (type),
1077                           build_address_of (soft_anewarray_node),
1078                           3,
1079                           length,
1080                           build_class_ref (class_type),
1081                           null_pointer_node);
1082 }
1083
1084 /* Return a node the evaluates 'new TYPE[LENGTH]'. */
1085
1086 tree
1087 build_new_array (tree type, tree length)
1088 {
1089   if (JPRIMITIVE_TYPE_P (type))
1090     return build_newarray (encode_newarray_type (type), length);
1091   else
1092     return build_anewarray (TREE_TYPE (type), length);
1093 }
1094
1095 /* Generates a call to _Jv_NewMultiArray. multianewarray expects a
1096    class pointer, a number of dimensions and the matching number of
1097    dimensions. The argument list is NULL terminated.  */
1098
1099 static void
1100 expand_java_multianewarray (tree class_type, int ndim)
1101 {
1102   int i;
1103   VEC(tree,gc) *args = NULL;
1104
1105   VEC_safe_grow (tree, gc, args, 3 + ndim);
1106
1107   VEC_replace (tree, args, 0, build_class_ref (class_type));
1108   VEC_replace (tree, args, 1, build_int_cst (NULL_TREE, ndim));
1109
1110   for(i = ndim - 1; i >= 0; i-- )
1111     VEC_replace (tree, args, (unsigned)(2 + i), pop_value (int_type_node));
1112
1113   VEC_replace (tree, args, 2 + ndim, null_pointer_node);
1114
1115   push_value (build_call_vec (promote_type (class_type),
1116                               build_address_of (soft_multianewarray_node),
1117                               args));
1118 }
1119
1120 /*  ARRAY[INDEX] <- RHS. build_java_check_indexed_type makes sure that
1121     ARRAY is an array type. May expand some bound checking and NULL
1122     pointer checking. RHS_TYPE_NODE we are going to store. In the case
1123     of the CHAR/BYTE/BOOLEAN SHORT, the type popped of the stack is an
1124     INT. In those cases, we make the conversion.
1125
1126     if ARRAy is a reference type, the assignment is checked at run-time
1127     to make sure that the RHS can be assigned to the array element
1128     type. It is not necessary to generate this code if ARRAY is final.  */
1129
1130 static void
1131 expand_java_arraystore (tree rhs_type_node)
1132 {
1133   tree rhs_node    = pop_value ((INTEGRAL_TYPE_P (rhs_type_node)
1134                                  && TYPE_PRECISION (rhs_type_node) <= 32) ?
1135                                  int_type_node : rhs_type_node);
1136   tree index = pop_value (int_type_node);
1137   tree array_type, array, temp, access;
1138
1139   /* If we're processing an `aaload' we might as well just pick
1140      `Object'.  */
1141   if (TREE_CODE (rhs_type_node) == POINTER_TYPE)
1142     {
1143       array_type = build_java_array_type (object_ptr_type_node, -1);
1144       rhs_type_node = object_ptr_type_node;
1145     }
1146   else
1147     array_type = build_java_array_type (rhs_type_node, -1);
1148
1149   array = pop_value (array_type);
1150   array = build1 (NOP_EXPR, promote_type (array_type), array);
1151
1152   rhs_type_node    = build_java_check_indexed_type (array, rhs_type_node);
1153
1154   flush_quick_stack ();
1155
1156   index = save_expr (index);
1157   array = save_expr (array);
1158
1159   /* We want to perform the bounds check (done by
1160      build_java_arrayaccess) before the type check (done by
1161      build_java_arraystore_check).  So, we call build_java_arrayaccess
1162      -- which returns an ARRAY_REF lvalue -- and we then generate code
1163      to stash the address of that lvalue in a temp.  Then we call
1164      build_java_arraystore_check, and finally we generate a
1165      MODIFY_EXPR to set the array element.  */
1166
1167   access = build_java_arrayaccess (array, rhs_type_node, index);
1168   temp = build_decl (input_location, VAR_DECL, NULL_TREE,
1169                      build_pointer_type (TREE_TYPE (access)));
1170   java_add_local_var (temp);
1171   java_add_stmt (build2 (MODIFY_EXPR, TREE_TYPE (temp),
1172                          temp,
1173                          build_fold_addr_expr (access)));
1174
1175   if (TREE_CODE (rhs_type_node) == POINTER_TYPE)
1176     {
1177       tree check = build_java_arraystore_check (array, rhs_node);
1178       java_add_stmt (check);
1179     }
1180
1181   java_add_stmt (build2 (MODIFY_EXPR, TREE_TYPE (access),
1182                          build1 (INDIRECT_REF, TREE_TYPE (access), temp),
1183                          rhs_node));
1184 }
1185
1186 /* Expand the evaluation of ARRAY[INDEX]. build_java_check_indexed_type makes
1187    sure that LHS is an array type. May expand some bound checking and NULL
1188    pointer checking.
1189    LHS_TYPE_NODE is the type of ARRAY[INDEX]. But in the case of CHAR/BYTE/
1190    BOOLEAN/SHORT, we push a promoted type back to the stack.
1191 */
1192
1193 static void
1194 expand_java_arrayload (tree lhs_type_node)
1195 {
1196   tree load_node;
1197   tree index_node = pop_value (int_type_node);
1198   tree array_type;
1199   tree array_node;
1200
1201   /* If we're processing an `aaload' we might as well just pick
1202      `Object'.  */
1203   if (TREE_CODE (lhs_type_node) == POINTER_TYPE)
1204     {
1205       array_type = build_java_array_type (object_ptr_type_node, -1);
1206       lhs_type_node = object_ptr_type_node;
1207     }
1208   else
1209     array_type = build_java_array_type (lhs_type_node, -1);
1210   array_node = pop_value (array_type);
1211   array_node = build1 (NOP_EXPR, promote_type (array_type), array_node);
1212
1213   index_node = save_expr (index_node);
1214   array_node = save_expr (array_node);
1215
1216   lhs_type_node = build_java_check_indexed_type (array_node,
1217                                                  lhs_type_node);
1218   load_node = build_java_arrayaccess (array_node,
1219                                       lhs_type_node,
1220                                       index_node);
1221   if (INTEGRAL_TYPE_P (lhs_type_node) && TYPE_PRECISION (lhs_type_node) <= 32)
1222     load_node = fold_build1 (NOP_EXPR, int_type_node, load_node);
1223   push_value (load_node);
1224 }
1225
1226 /* Expands .length. Makes sure that we deal with and array and may expand
1227    a NULL check on the array object.  */
1228
1229 static void
1230 expand_java_array_length (void)
1231 {
1232   tree array  = pop_value (ptr_type_node);
1233   tree length = build_java_array_length_access (array);
1234
1235   push_value (length);
1236 }
1237
1238 /* Emit code for the call to _Jv_Monitor{Enter,Exit}. CALL can be
1239    either soft_monitorenter_node or soft_monitorexit_node.  */
1240
1241 static tree
1242 build_java_monitor (tree call, tree object)
1243 {
1244   return build_call_nary (void_type_node,
1245                           build_address_of (call),
1246                           1, object);
1247 }
1248
1249 /* Emit code for one of the PUSHC instructions. */
1250
1251 static void
1252 expand_java_pushc (int ival, tree type)
1253 {
1254   tree value;
1255   if (type == ptr_type_node && ival == 0)
1256     value = null_pointer_node;
1257   else if (type == int_type_node || type == long_type_node)
1258     value = build_int_cst (type, ival);
1259   else if (type == float_type_node || type == double_type_node)
1260     {
1261       REAL_VALUE_TYPE x;
1262       REAL_VALUE_FROM_INT (x, ival, 0, TYPE_MODE (type));
1263       value = build_real (type, x);
1264     }
1265   else
1266     gcc_unreachable ();
1267
1268   push_value (value);
1269 }
1270
1271 static void
1272 expand_java_return (tree type)
1273 {
1274   if (type == void_type_node)
1275     java_add_stmt (build1 (RETURN_EXPR, void_type_node, NULL));
1276   else
1277     {
1278       tree retval = pop_value (type);
1279       tree res = DECL_RESULT (current_function_decl);
1280       retval = build2 (MODIFY_EXPR, TREE_TYPE (res), res, retval);
1281
1282       /* Handle the situation where the native integer type is smaller
1283          than the JVM integer. It can happen for many cross compilers.
1284          The whole if expression just goes away if INT_TYPE_SIZE < 32
1285          is false. */
1286       if (INT_TYPE_SIZE < 32
1287           && (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (res)))
1288               < GET_MODE_SIZE (TYPE_MODE (type))))
1289         retval = build1(NOP_EXPR, TREE_TYPE(res), retval);
1290
1291       TREE_SIDE_EFFECTS (retval) = 1;
1292       java_add_stmt (build1 (RETURN_EXPR, void_type_node, retval));
1293     }
1294 }
1295
1296 static void
1297 expand_load_internal (int index, tree type, int pc)
1298 {
1299   tree copy;
1300   tree var = find_local_variable (index, type, pc);
1301
1302   /* Now VAR is the VAR_DECL (or PARM_DECL) that we are going to push
1303      on the stack.  If there is an assignment to this VAR_DECL between
1304      the stack push and the use, then the wrong code could be
1305      generated.  To avoid this we create a new local and copy our
1306      value into it.  Then we push this new local on the stack.
1307      Hopefully this all gets optimized out.  */
1308   copy = build_decl (input_location, VAR_DECL, NULL_TREE, type);
1309   if ((INTEGRAL_TYPE_P (type) || POINTER_TYPE_P (type))
1310       && TREE_TYPE (copy) != TREE_TYPE (var))
1311     var = convert (type, var);
1312   java_add_local_var (copy);
1313   java_add_stmt (build2 (MODIFY_EXPR, TREE_TYPE (var), copy, var));
1314
1315   push_value (copy);
1316 }
1317
1318 tree
1319 build_address_of (tree value)
1320 {
1321   return build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (value)), value);
1322 }
1323
1324 bool
1325 class_has_finalize_method (tree type)
1326 {
1327   tree super = CLASSTYPE_SUPER (type);
1328
1329   if (super == NULL_TREE)
1330     return false;       /* Every class with a real finalizer inherits   */
1331                         /* from java.lang.Object.                       */
1332   else
1333     return HAS_FINALIZER_P (type) || class_has_finalize_method (super);
1334 }
1335
1336 tree
1337 java_create_object (tree type)
1338 {
1339   tree alloc_node = (class_has_finalize_method (type)
1340                      ? alloc_object_node
1341                      : alloc_no_finalizer_node);
1342
1343   return build_call_nary (promote_type (type),
1344                           build_address_of (alloc_node),
1345                           1, build_class_ref (type));
1346 }
1347
1348 static void
1349 expand_java_NEW (tree type)
1350 {
1351   tree alloc_node;
1352
1353   alloc_node = (class_has_finalize_method (type) ? alloc_object_node
1354                                                  : alloc_no_finalizer_node);
1355   if (! CLASS_LOADED_P (type))
1356     load_class (type, 1);
1357   safe_layout_class (type);
1358   push_value (build_call_nary (promote_type (type),
1359                                build_address_of (alloc_node),
1360                                1, build_class_ref (type)));
1361 }
1362
1363 /* This returns an expression which will extract the class of an
1364    object.  */
1365
1366 tree
1367 build_get_class (tree value)
1368 {
1369   tree class_field = lookup_field (&dtable_type, get_identifier ("class"));
1370   tree vtable_field = lookup_field (&object_type_node,
1371                                     get_identifier ("vtable"));
1372   tree tmp = build3 (COMPONENT_REF, dtable_ptr_type,
1373                      build_java_indirect_ref (object_type_node, value,
1374                                               flag_check_references),
1375                      vtable_field, NULL_TREE);
1376   return build3 (COMPONENT_REF, class_ptr_type,
1377                  build1 (INDIRECT_REF, dtable_type, tmp),
1378                  class_field, NULL_TREE);
1379 }
1380
1381 /* This builds the tree representation of the `instanceof' operator.
1382    It tries various tricks to optimize this in cases where types are
1383    known.  */
1384
1385 tree
1386 build_instanceof (tree value, tree type)
1387 {
1388   tree expr;
1389   tree itype = TREE_TYPE (TREE_TYPE (soft_instanceof_node));
1390   tree valtype = TREE_TYPE (TREE_TYPE (value));
1391   tree valclass = TYPE_NAME (valtype);
1392   tree klass;
1393
1394   /* When compiling from bytecode, we need to ensure that TYPE has
1395      been loaded.  */
1396   if (CLASS_P (type) && ! CLASS_LOADED_P (type))
1397     {
1398       load_class (type, 1);
1399       safe_layout_class (type);
1400       if (! TYPE_SIZE (type) || TREE_CODE (TYPE_SIZE (type)) == ERROR_MARK)
1401         return error_mark_node;
1402     }
1403   klass = TYPE_NAME (type);
1404
1405   if (type == object_type_node || inherits_from_p (valtype, type))
1406     {
1407       /* Anything except `null' is an instance of Object.  Likewise,
1408          if the object is known to be an instance of the class, then
1409          we only need to check for `null'.  */
1410       expr = build2 (NE_EXPR, itype, value, null_pointer_node);
1411     }
1412   else if (flag_verify_invocations
1413            && ! TYPE_ARRAY_P (type)
1414            && ! TYPE_ARRAY_P (valtype)
1415            && DECL_P (klass) && DECL_P (valclass)
1416            && ! CLASS_INTERFACE (valclass)
1417            && ! CLASS_INTERFACE (klass)
1418            && ! inherits_from_p (type, valtype)
1419            && (CLASS_FINAL (klass)
1420                || ! inherits_from_p (valtype, type)))
1421     {
1422       /* The classes are from different branches of the derivation
1423          tree, so we immediately know the answer.  */
1424       expr = boolean_false_node;
1425     }
1426   else if (DECL_P (klass) && CLASS_FINAL (klass))
1427     {
1428       tree save = save_expr (value);
1429       expr = build3 (COND_EXPR, itype,
1430                      build2 (NE_EXPR, boolean_type_node,
1431                              save, null_pointer_node),
1432                      build2 (EQ_EXPR, itype,
1433                              build_get_class (save),
1434                              build_class_ref (type)),
1435                      boolean_false_node);
1436     }
1437   else
1438     {
1439       expr = build_call_nary (itype,
1440                               build_address_of (soft_instanceof_node),
1441                               2, value, build_class_ref (type));
1442     }
1443   TREE_SIDE_EFFECTS (expr) = TREE_SIDE_EFFECTS (value);
1444   return expr;
1445 }
1446
1447 static void
1448 expand_java_INSTANCEOF (tree type)
1449 {
1450   tree value = pop_value (object_ptr_type_node);
1451   value = build_instanceof (value, type);
1452   push_value (value);
1453 }
1454
1455 static void
1456 expand_java_CHECKCAST (tree type)
1457 {
1458   tree value = pop_value (ptr_type_node);
1459   value = build_call_nary (promote_type (type),
1460                            build_address_of (soft_checkcast_node),
1461                            2, build_class_ref (type), value);
1462   push_value (value);
1463 }
1464
1465 static void
1466 expand_iinc (unsigned int local_var_index, int ival, int pc)
1467 {
1468   tree local_var, res;
1469   tree constant_value;
1470
1471   flush_quick_stack ();
1472   local_var = find_local_variable (local_var_index, int_type_node, pc);
1473   constant_value = build_int_cst (NULL_TREE, ival);
1474   res = fold_build2 (PLUS_EXPR, int_type_node, local_var, constant_value);
1475   java_add_stmt (build2 (MODIFY_EXPR, TREE_TYPE (local_var), local_var, res));
1476 }
1477
1478
1479 tree
1480 build_java_soft_divmod (enum tree_code op, tree type, tree op1, tree op2)
1481 {
1482   tree call = NULL;
1483   tree arg1 = convert (type, op1);
1484   tree arg2 = convert (type, op2);
1485
1486   if (type == int_type_node)
1487     {
1488       switch (op)
1489         {
1490         case TRUNC_DIV_EXPR:
1491           call = soft_idiv_node;
1492           break;
1493         case TRUNC_MOD_EXPR:
1494           call = soft_irem_node;
1495           break;
1496         default:
1497           break;
1498         }
1499     }
1500   else if (type == long_type_node)
1501     {
1502       switch (op)
1503         {
1504         case TRUNC_DIV_EXPR:
1505           call = soft_ldiv_node;
1506           break;
1507         case TRUNC_MOD_EXPR:
1508           call = soft_lrem_node;
1509           break;
1510         default:
1511           break;
1512         }
1513     }
1514
1515   gcc_assert (call);
1516   call = build_call_nary (type, build_address_of (call), 2, arg1, arg2);
1517   return call;
1518 }
1519
1520 tree
1521 build_java_binop (enum tree_code op, tree type, tree arg1, tree arg2)
1522 {
1523   tree mask;
1524   switch (op)
1525     {
1526     case URSHIFT_EXPR:
1527       {
1528         tree u_type = unsigned_type_for (type);
1529         arg1 = convert (u_type, arg1);
1530         arg1 = build_java_binop (RSHIFT_EXPR, u_type, arg1, arg2);
1531         return convert (type, arg1);
1532       }
1533     case LSHIFT_EXPR:
1534     case RSHIFT_EXPR:
1535       mask = build_int_cst (NULL_TREE,
1536                             TYPE_PRECISION (TREE_TYPE (arg1)) - 1);
1537       arg2 = fold_build2 (BIT_AND_EXPR, int_type_node, arg2, mask);
1538       break;
1539
1540     case COMPARE_L_EXPR:  /* arg1 > arg2 ?  1 : arg1 == arg2 ? 0 : -1 */
1541     case COMPARE_G_EXPR:  /* arg1 < arg2 ? -1 : arg1 == arg2 ? 0 :  1 */
1542       arg1 = save_expr (arg1);  arg2 = save_expr (arg2);
1543       {
1544         tree ifexp1 = fold_build2 (op == COMPARE_L_EXPR ? GT_EXPR : LT_EXPR,
1545                                    boolean_type_node, arg1, arg2);
1546         tree ifexp2 = fold_build2 (EQ_EXPR, boolean_type_node, arg1, arg2);
1547         tree second_compare = fold_build3 (COND_EXPR, int_type_node,
1548                                            ifexp2, integer_zero_node,
1549                                            op == COMPARE_L_EXPR
1550                                            ? integer_minus_one_node
1551                                            : integer_one_node);
1552         return fold_build3 (COND_EXPR, int_type_node, ifexp1,
1553                             op == COMPARE_L_EXPR ? integer_one_node
1554                             : integer_minus_one_node,
1555                             second_compare);
1556       }
1557     case COMPARE_EXPR:
1558       arg1 = save_expr (arg1);  arg2 = save_expr (arg2);
1559       {
1560         tree ifexp1 = fold_build2 (LT_EXPR, boolean_type_node, arg1, arg2);
1561         tree ifexp2 = fold_build2 (GT_EXPR, boolean_type_node, arg1, arg2);
1562         tree second_compare = fold_build3 (COND_EXPR, int_type_node,
1563                                            ifexp2, integer_one_node,
1564                                            integer_zero_node);
1565         return fold_build3 (COND_EXPR, int_type_node,
1566                             ifexp1, integer_minus_one_node, second_compare);
1567       }
1568     case TRUNC_DIV_EXPR:
1569     case TRUNC_MOD_EXPR:
1570       if (TREE_CODE (type) == REAL_TYPE
1571           && op == TRUNC_MOD_EXPR)
1572         {
1573           tree call;
1574           if (type != double_type_node)
1575             {
1576               arg1 = convert (double_type_node, arg1);
1577               arg2 = convert (double_type_node, arg2);
1578             }
1579           call = build_call_nary (double_type_node,
1580                                   build_address_of (soft_fmod_node),
1581                                   2, arg1, arg2);
1582           if (type != double_type_node)
1583             call = convert (type, call);
1584           return call;
1585         }
1586
1587       if (TREE_CODE (type) == INTEGER_TYPE
1588           && flag_use_divide_subroutine
1589           && ! flag_syntax_only)
1590         return build_java_soft_divmod (op, type, arg1, arg2);
1591
1592       break;
1593     default:  ;
1594     }
1595   return fold_build2 (op, type, arg1, arg2);
1596 }
1597
1598 static void
1599 expand_java_binop (tree type, enum tree_code op)
1600 {
1601   tree larg, rarg;
1602   tree ltype = type;
1603   tree rtype = type;
1604   switch (op)
1605     {
1606     case LSHIFT_EXPR:
1607     case RSHIFT_EXPR:
1608     case URSHIFT_EXPR:
1609       rtype = int_type_node;
1610       rarg = pop_value (rtype);
1611       break;
1612     default:
1613       rarg = pop_value (rtype);
1614     }
1615   larg = pop_value (ltype);
1616   push_value (build_java_binop (op, type, larg, rarg));
1617 }
1618
1619 /* Lookup the field named NAME in *TYPEP or its super classes.
1620    If not found, return NULL_TREE.
1621    (If the *TYPEP is not found, or if the field reference is
1622    ambiguous, return error_mark_node.)
1623    If found, return the FIELD_DECL, and set *TYPEP to the
1624    class containing the field. */
1625
1626 tree
1627 lookup_field (tree *typep, tree name)
1628 {
1629   if (CLASS_P (*typep) && !CLASS_LOADED_P (*typep))
1630     {
1631       load_class (*typep, 1);
1632       safe_layout_class (*typep);
1633       if (!TYPE_SIZE (*typep) || TREE_CODE (TYPE_SIZE (*typep)) == ERROR_MARK)
1634         return error_mark_node;
1635     }
1636   do
1637     {
1638       tree field, binfo, base_binfo;
1639       tree save_field;
1640       int i;
1641
1642       for (field = TYPE_FIELDS (*typep); field; field = DECL_CHAIN (field))
1643         if (DECL_NAME (field) == name)
1644           return field;
1645
1646       /* Process implemented interfaces. */
1647       save_field = NULL_TREE;
1648       for (binfo = TYPE_BINFO (*typep), i = 0;
1649            BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
1650         {
1651           tree t = BINFO_TYPE (base_binfo);
1652           if ((field = lookup_field (&t, name)))
1653             {
1654               if (save_field == field)
1655                 continue;
1656               if (save_field == NULL_TREE)
1657                 save_field = field;
1658               else
1659                 {
1660                   tree i1 = DECL_CONTEXT (save_field);
1661                   tree i2 = DECL_CONTEXT (field);
1662                   error ("reference %qs is ambiguous: appears in interface %qs and interface %qs",
1663                          IDENTIFIER_POINTER (name),
1664                          IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (i1))),
1665                          IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (i2))));
1666                   return error_mark_node;
1667                 }
1668             }
1669         }
1670
1671       if (save_field != NULL_TREE)
1672         return save_field;
1673
1674       *typep = CLASSTYPE_SUPER (*typep);
1675     } while (*typep);
1676   return NULL_TREE;
1677 }
1678
1679 /* Look up the field named NAME in object SELF_VALUE,
1680    which has class SELF_CLASS (a non-handle RECORD_TYPE).
1681    SELF_VALUE is NULL_TREE if looking for a static field. */
1682
1683 tree
1684 build_field_ref (tree self_value, tree self_class, tree name)
1685 {
1686   tree base_class = self_class;
1687   tree field_decl = lookup_field (&base_class, name);
1688   if (field_decl == NULL_TREE)
1689     {
1690       error ("field %qs not found", IDENTIFIER_POINTER (name));
1691       return error_mark_node;
1692     }
1693   if (self_value == NULL_TREE)
1694     {
1695       return build_static_field_ref (field_decl);
1696     }
1697   else
1698     {
1699       tree base_type = promote_type (base_class);
1700
1701       /* CHECK is true if self_value is not the this pointer.  */
1702       int check = (! (DECL_P (self_value)
1703                       && DECL_NAME (self_value) == this_identifier_node));
1704
1705       /* Determine whether a field offset from NULL will lie within
1706          Page 0: this is necessary on those GNU/Linux/BSD systems that
1707          trap SEGV to generate NullPointerExceptions.
1708
1709          We assume that Page 0 will be mapped with NOPERM, and that
1710          memory may be allocated from any other page, so only field
1711          offsets < pagesize are guaranteed to trap.  We also assume
1712          the smallest page size we'll encounter is 4k bytes.  */
1713       if (! flag_syntax_only && check && ! flag_check_references
1714           && ! flag_indirect_dispatch)
1715         {
1716           tree field_offset = byte_position (field_decl);
1717           if (! page_size)
1718             page_size = size_int (4096);
1719           check = ! INT_CST_LT_UNSIGNED (field_offset, page_size);
1720         }
1721
1722       if (base_type != TREE_TYPE (self_value))
1723         self_value = fold_build1 (NOP_EXPR, base_type, self_value);
1724       if (! flag_syntax_only && flag_indirect_dispatch)
1725         {
1726           tree otable_index
1727             = build_int_cst (NULL_TREE, get_symbol_table_index
1728                              (field_decl, NULL_TREE,
1729                               &TYPE_OTABLE_METHODS (output_class)));
1730           tree field_offset
1731             = build4 (ARRAY_REF, integer_type_node,
1732                       TYPE_OTABLE_DECL (output_class), otable_index,
1733                       NULL_TREE, NULL_TREE);
1734           tree address;
1735
1736           if (DECL_CONTEXT (field_decl) != output_class)
1737             field_offset
1738               = build3 (COND_EXPR, TREE_TYPE (field_offset),
1739                         build2 (EQ_EXPR, boolean_type_node,
1740                                 field_offset, integer_zero_node),
1741                         build_call_nary (void_type_node,
1742                                          build_address_of (soft_nosuchfield_node),
1743                                          1, otable_index),
1744                         field_offset);
1745
1746           self_value = java_check_reference (self_value, check);
1747           address = fold_build_pointer_plus (self_value, field_offset);
1748           address = fold_convert (build_pointer_type (TREE_TYPE (field_decl)),
1749                                   address);
1750           return fold_build1 (INDIRECT_REF, TREE_TYPE (field_decl), address);
1751         }
1752
1753       self_value = build_java_indirect_ref (TREE_TYPE (TREE_TYPE (self_value)),
1754                                             self_value, check);
1755       return fold_build3 (COMPONENT_REF, TREE_TYPE (field_decl),
1756                           self_value, field_decl, NULL_TREE);
1757     }
1758 }
1759
1760 tree
1761 lookup_label (int pc)
1762 {
1763   tree name;
1764   char buf[32];
1765   if (pc > highest_label_pc_this_method)
1766     highest_label_pc_this_method = pc;
1767   targetm.asm_out.generate_internal_label (buf, "LJpc=",
1768                                            start_label_pc_this_method + pc);
1769   name = get_identifier (buf);
1770   if (IDENTIFIER_LOCAL_VALUE (name))
1771     return IDENTIFIER_LOCAL_VALUE (name);
1772   else
1773     {
1774       /* The type of the address of a label is return_address_type_node. */
1775       tree decl = create_label_decl (name);
1776       return pushdecl (decl);
1777     }
1778 }
1779
1780 /* Generate a unique name for the purpose of loops and switches
1781    labels, and try-catch-finally blocks label or temporary variables.  */
1782
1783 tree
1784 generate_name (void)
1785 {
1786   static int l_number = 0;
1787   char buff [32];
1788   targetm.asm_out.generate_internal_label (buff, "LJv", l_number);
1789   l_number++;
1790   return get_identifier (buff);
1791 }
1792
1793 tree
1794 create_label_decl (tree name)
1795 {
1796   tree decl;
1797   decl = build_decl (input_location, LABEL_DECL, name,
1798                      TREE_TYPE (return_address_type_node));
1799   DECL_CONTEXT (decl) = current_function_decl;
1800   DECL_IGNORED_P (decl) = 1;
1801   return decl;
1802 }
1803
1804 /* This maps a bytecode offset (PC) to various flags.  */
1805 char *instruction_bits;
1806
1807 /* This is a vector of type states for the current method.  It is
1808    indexed by PC.  Each element is a tree vector holding the type
1809    state at that PC.  We only note type states at basic block
1810    boundaries.  */
1811 VEC(tree, gc) *type_states;
1812
1813 static void
1814 note_label (int current_pc ATTRIBUTE_UNUSED, int target_pc)
1815 {
1816   lookup_label (target_pc);
1817   instruction_bits [target_pc] |= BCODE_JUMP_TARGET;
1818 }
1819
1820 /* Emit code to jump to TARGET_PC if VALUE1 CONDITION VALUE2,
1821    where CONDITION is one of one the compare operators. */
1822
1823 static void
1824 expand_compare (enum tree_code condition, tree value1, tree value2,
1825                 int target_pc)
1826 {
1827   tree target = lookup_label (target_pc);
1828   tree cond = fold_build2 (condition, boolean_type_node, value1, value2);
1829   java_add_stmt
1830     (build3 (COND_EXPR, void_type_node, java_truthvalue_conversion (cond),
1831              build1 (GOTO_EXPR, void_type_node, target),
1832              build_java_empty_stmt ()));
1833 }
1834
1835 /* Emit code for a TEST-type opcode. */
1836
1837 static void
1838 expand_test (enum tree_code condition, tree type, int target_pc)
1839 {
1840   tree value1, value2;
1841   flush_quick_stack ();
1842   value1 = pop_value (type);
1843   value2 = (type == ptr_type_node) ? null_pointer_node : integer_zero_node;
1844   expand_compare (condition, value1, value2, target_pc);
1845 }
1846
1847 /* Emit code for a COND-type opcode. */
1848
1849 static void
1850 expand_cond (enum tree_code condition, tree type, int target_pc)
1851 {
1852   tree value1, value2;
1853   flush_quick_stack ();
1854   /* note: pop values in opposite order */
1855   value2 = pop_value (type);
1856   value1 = pop_value (type);
1857   /* Maybe should check value1 and value2 for type compatibility ??? */
1858   expand_compare (condition, value1, value2, target_pc);
1859 }
1860
1861 static void
1862 expand_java_goto (int target_pc)
1863 {
1864   tree target_label = lookup_label (target_pc);
1865   flush_quick_stack ();
1866   java_add_stmt (build1 (GOTO_EXPR, void_type_node, target_label));
1867 }
1868
1869 static tree
1870 expand_java_switch (tree selector, int default_pc)
1871 {
1872   tree switch_expr, x;
1873
1874   flush_quick_stack ();
1875   switch_expr = build3 (SWITCH_EXPR, TREE_TYPE (selector), selector,
1876                         NULL_TREE, NULL_TREE);
1877   java_add_stmt (switch_expr);
1878
1879   x = build_case_label (NULL_TREE, NULL_TREE,
1880                         create_artificial_label (input_location));
1881   append_to_statement_list (x, &SWITCH_BODY (switch_expr));
1882
1883   x = build1 (GOTO_EXPR, void_type_node, lookup_label (default_pc));
1884   append_to_statement_list (x, &SWITCH_BODY (switch_expr));
1885
1886   return switch_expr;
1887 }
1888
1889 static void
1890 expand_java_add_case (tree switch_expr, int match, int target_pc)
1891 {
1892   tree value, x;
1893
1894   value = build_int_cst (TREE_TYPE (switch_expr), match);
1895
1896   x = build_case_label (value, NULL_TREE,
1897                         create_artificial_label (input_location));
1898   append_to_statement_list (x, &SWITCH_BODY (switch_expr));
1899
1900   x = build1 (GOTO_EXPR, void_type_node, lookup_label (target_pc));
1901   append_to_statement_list (x, &SWITCH_BODY (switch_expr));
1902 }
1903
1904 static VEC(tree,gc) *
1905 pop_arguments (tree method_type)
1906 {
1907   function_args_iterator fnai;
1908   tree type;
1909   VEC(tree,gc) *args = NULL;
1910   int arity;
1911
1912   FOREACH_FUNCTION_ARGS (method_type, type, fnai)
1913     {
1914       /* XXX: leaky abstraction.  */
1915       if (type == void_type_node)
1916         break;
1917
1918       VEC_safe_push (tree, gc, args, type);
1919     }
1920
1921   arity = VEC_length (tree, args);
1922
1923   while (arity--)
1924     {
1925       tree arg = pop_value (VEC_index (tree, args, arity));
1926
1927       /* We simply cast each argument to its proper type.  This is
1928          needed since we lose type information coming out of the
1929          verifier.  We also have to do this when we pop an integer
1930          type that must be promoted for the function call.  */
1931       if (TREE_CODE (type) == POINTER_TYPE)
1932         arg = build1 (NOP_EXPR, type, arg);
1933       else if (targetm.calls.promote_prototypes (type)
1934                && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node)
1935                && INTEGRAL_TYPE_P (type))
1936         arg = convert (integer_type_node, arg);
1937
1938       VEC_replace (tree, args, arity, arg);
1939     }
1940
1941   return args;
1942 }
1943
1944 /* Attach to PTR (a block) the declaration found in ENTRY. */
1945
1946 int
1947 attach_init_test_initialization_flags (void **entry, void *ptr)
1948 {
1949   tree block = (tree)ptr;
1950   struct treetreehash_entry *ite = (struct treetreehash_entry *) *entry;
1951
1952   if (block != error_mark_node)
1953     {
1954       if (TREE_CODE (block) == BIND_EXPR)
1955         {
1956           tree body = BIND_EXPR_BODY (block);
1957           DECL_CHAIN (ite->value) = BIND_EXPR_VARS (block);
1958           BIND_EXPR_VARS (block) = ite->value;
1959           body = build2 (COMPOUND_EXPR, void_type_node,
1960                          build1 (DECL_EXPR, void_type_node, ite->value), body);
1961           BIND_EXPR_BODY (block) = body;
1962         }
1963       else
1964         {
1965           tree body = BLOCK_SUBBLOCKS (block);
1966           TREE_CHAIN (ite->value) = BLOCK_EXPR_DECLS (block);
1967           BLOCK_EXPR_DECLS (block) = ite->value;
1968           body = build2 (COMPOUND_EXPR, void_type_node,
1969                          build1 (DECL_EXPR, void_type_node, ite->value), body);
1970           BLOCK_SUBBLOCKS (block) = body;
1971         }
1972
1973     }
1974   return true;
1975 }
1976
1977 /* Build an expression to initialize the class CLAS.
1978    if EXPR is non-NULL, returns an expression to first call the initializer
1979    (if it is needed) and then calls EXPR. */
1980
1981 tree
1982 build_class_init (tree clas, tree expr)
1983 {
1984   tree init;
1985
1986   /* An optimization: if CLAS is a superclass of the class we're
1987      compiling, we don't need to initialize it.  However, if CLAS is
1988      an interface, it won't necessarily be initialized, even if we
1989      implement it.  */
1990   if ((! CLASS_INTERFACE (TYPE_NAME (clas))
1991        && inherits_from_p (current_class, clas))
1992       || current_class == clas)
1993     return expr;
1994
1995   if (always_initialize_class_p)
1996     {
1997       init = build_call_nary (void_type_node,
1998                               build_address_of (soft_initclass_node),
1999                               1, build_class_ref (clas));
2000       TREE_SIDE_EFFECTS (init) = 1;
2001     }
2002   else
2003     {
2004       tree *init_test_decl;
2005       tree decl;
2006       init_test_decl = java_treetreehash_new
2007         (DECL_FUNCTION_INIT_TEST_TABLE (current_function_decl), clas);
2008
2009       if (*init_test_decl == NULL)
2010         {
2011           /* Build a declaration and mark it as a flag used to track
2012              static class initializations. */
2013           decl = build_decl (input_location, VAR_DECL, NULL_TREE,
2014                              boolean_type_node);
2015           MAYBE_CREATE_VAR_LANG_DECL_SPECIFIC (decl);
2016           DECL_CONTEXT (decl) = current_function_decl;
2017           DECL_INITIAL (decl) = boolean_false_node;
2018           /* Don't emit any symbolic debugging info for this decl.  */
2019           DECL_IGNORED_P (decl) = 1;
2020           *init_test_decl = decl;
2021         }
2022
2023       init = build_call_nary (void_type_node,
2024                               build_address_of (soft_initclass_node),
2025                               1, build_class_ref (clas));
2026       TREE_SIDE_EFFECTS (init) = 1;
2027       init = build3 (COND_EXPR, void_type_node,
2028                      build2 (EQ_EXPR, boolean_type_node,
2029                              *init_test_decl, boolean_false_node),
2030                      init, integer_zero_node);
2031       TREE_SIDE_EFFECTS (init) = 1;
2032       init = build2 (COMPOUND_EXPR, TREE_TYPE (expr), init,
2033                      build2 (MODIFY_EXPR, boolean_type_node,
2034                              *init_test_decl, boolean_true_node));
2035       TREE_SIDE_EFFECTS (init) = 1;
2036     }
2037
2038   if (expr != NULL_TREE)
2039     {
2040       expr = build2 (COMPOUND_EXPR, TREE_TYPE (expr), init, expr);
2041       TREE_SIDE_EFFECTS (expr) = 1;
2042       return expr;
2043     }
2044   return init;
2045 }
2046
2047 \f
2048
2049 /* Rewrite expensive calls that require stack unwinding at runtime to
2050    cheaper alternatives.  The logic here performs these
2051    transformations:
2052
2053    java.lang.Class.forName("foo") -> java.lang.Class.forName("foo", class$)
2054    java.lang.Class.getClassLoader() -> java.lang.Class.getClassLoader(class$)
2055
2056 */
2057
2058 typedef struct
2059 {
2060   const char *classname;
2061   const char *method;
2062   const char *signature;
2063   const char *new_classname;
2064   const char *new_signature;
2065   int flags;
2066   void (*rewrite_arglist) (VEC(tree,gc) **);
2067 } rewrite_rule;
2068
2069 /* Add __builtin_return_address(0) to the end of an arglist.  */
2070
2071
2072 static void
2073 rewrite_arglist_getcaller (VEC(tree,gc) **arglist)
2074 {
2075   tree retaddr
2076     = build_call_expr (built_in_decls[BUILT_IN_RETURN_ADDRESS],
2077                        1, integer_zero_node);
2078
2079   DECL_UNINLINABLE (current_function_decl) = 1;
2080
2081   VEC_safe_push (tree, gc, *arglist, retaddr);
2082 }
2083
2084 /* Add this.class to the end of an arglist.  */
2085
2086 static void
2087 rewrite_arglist_getclass (VEC(tree,gc) **arglist)
2088 {
2089   VEC_safe_push (tree, gc, *arglist, build_class_ref (output_class));
2090 }
2091
2092 static rewrite_rule rules[] =
2093   {{"java.lang.Class", "getClassLoader", "()Ljava/lang/ClassLoader;",
2094     "java.lang.Class", "(Ljava/lang/Class;)Ljava/lang/ClassLoader;",
2095     ACC_FINAL|ACC_PRIVATE, rewrite_arglist_getclass},
2096
2097    {"java.lang.Class", "forName", "(Ljava/lang/String;)Ljava/lang/Class;",
2098     "java.lang.Class", "(Ljava/lang/String;Ljava/lang/Class;)Ljava/lang/Class;",
2099     ACC_FINAL|ACC_PRIVATE|ACC_STATIC, rewrite_arglist_getclass},
2100
2101    {"gnu.classpath.VMStackWalker", "getCallingClass", "()Ljava/lang/Class;",
2102     "gnu.classpath.VMStackWalker", "(Lgnu/gcj/RawData;)Ljava/lang/Class;",
2103     ACC_FINAL|ACC_PRIVATE|ACC_STATIC, rewrite_arglist_getcaller},
2104
2105    {"gnu.classpath.VMStackWalker", "getCallingClassLoader",
2106     "()Ljava/lang/ClassLoader;",
2107     "gnu.classpath.VMStackWalker", "(Lgnu/gcj/RawData;)Ljava/lang/ClassLoader;",
2108     ACC_FINAL|ACC_PRIVATE|ACC_STATIC, rewrite_arglist_getcaller},
2109
2110    {"gnu.java.lang.VMCPStringBuilder", "toString", "([CII)Ljava/lang/String;",
2111     "java.lang.String", "([CII)Ljava/lang/String;",
2112     ACC_FINAL|ACC_PRIVATE|ACC_STATIC, NULL},
2113
2114    {NULL, NULL, NULL, NULL, NULL, 0, NULL}};
2115
2116 /* True if this method is special, i.e. it's a private method that
2117    should be exported from a DSO.  */
2118
2119 bool
2120 special_method_p (tree candidate_method)
2121 {
2122   tree context = DECL_NAME (TYPE_NAME (DECL_CONTEXT (candidate_method)));
2123   tree method = DECL_NAME (candidate_method);
2124   rewrite_rule *p;
2125
2126   for (p = rules; p->classname; p++)
2127     {
2128       if (get_identifier (p->classname) == context
2129           && get_identifier (p->method) == method)
2130         return true;
2131     }
2132   return false;
2133 }
2134
2135 /* Scan the rules list for replacements for *METHOD_P and replace the
2136    args accordingly.  If the rewrite results in an access to a private
2137    method, update SPECIAL.*/
2138
2139 void
2140 maybe_rewrite_invocation (tree *method_p, VEC(tree,gc) **arg_list_p,
2141                           tree *method_signature_p, tree *special)
2142 {
2143   tree context = DECL_NAME (TYPE_NAME (DECL_CONTEXT (*method_p)));
2144   rewrite_rule *p;
2145   *special = NULL_TREE;
2146
2147   for (p = rules; p->classname; p++)
2148     {
2149       if (get_identifier (p->classname) == context)
2150         {
2151           tree method = DECL_NAME (*method_p);
2152           if (get_identifier (p->method) == method
2153               && get_identifier (p->signature) == *method_signature_p)
2154             {
2155               tree maybe_method;
2156               tree destination_class
2157                 = lookup_class (get_identifier (p->new_classname));
2158               gcc_assert (destination_class);
2159               maybe_method
2160                 = lookup_java_method (destination_class,
2161                                       method,
2162                                       get_identifier (p->new_signature));
2163               if (! maybe_method && ! flag_verify_invocations)
2164                 {
2165                   maybe_method
2166                     = add_method (destination_class, p->flags,
2167                                   method, get_identifier (p->new_signature));
2168                   DECL_EXTERNAL (maybe_method) = 1;
2169                 }
2170               *method_p = maybe_method;
2171               gcc_assert (*method_p);
2172               if (p->rewrite_arglist)
2173                 p->rewrite_arglist (arg_list_p);
2174               *method_signature_p = get_identifier (p->new_signature);
2175               *special = integer_one_node;
2176
2177               break;
2178             }
2179         }
2180     }
2181 }
2182
2183 \f
2184
2185 tree
2186 build_known_method_ref (tree method, tree method_type ATTRIBUTE_UNUSED,
2187                         tree self_type, tree method_signature ATTRIBUTE_UNUSED,
2188                         VEC(tree,gc) *arg_list ATTRIBUTE_UNUSED, tree special)
2189 {
2190   tree func;
2191   if (is_compiled_class (self_type))
2192     {
2193       /* With indirect dispatch we have to use indirect calls for all
2194          publicly visible methods or gcc will use PLT indirections
2195          to reach them.  We also have to use indirect dispatch for all
2196          external methods.  */
2197       if (! flag_indirect_dispatch
2198           || (! DECL_EXTERNAL (method) && ! TREE_PUBLIC (method)))
2199         {
2200           func = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (method)),
2201                          method);
2202         }
2203       else
2204         {
2205           tree table_index
2206             = build_int_cst (NULL_TREE,
2207                              (get_symbol_table_index
2208                               (method, special,
2209                                &TYPE_ATABLE_METHODS (output_class))));
2210           func
2211             = build4 (ARRAY_REF,
2212                       TREE_TYPE (TREE_TYPE (TYPE_ATABLE_DECL (output_class))),
2213                       TYPE_ATABLE_DECL (output_class), table_index,
2214                       NULL_TREE, NULL_TREE);
2215         }
2216       func = convert (method_ptr_type_node, func);
2217     }
2218   else
2219     {
2220       /* We don't know whether the method has been (statically) compiled.
2221          Compile this code to get a reference to the method's code:
2222
2223          SELF_TYPE->methods[METHOD_INDEX].ncode
2224
2225       */
2226
2227       int method_index = 0;
2228       tree meth, ref;
2229
2230       /* The method might actually be declared in some superclass, so
2231          we have to use its class context, not the caller's notion of
2232          where the method is.  */
2233       self_type = DECL_CONTEXT (method);
2234       ref = build_class_ref (self_type);
2235       ref = build1 (INDIRECT_REF, class_type_node, ref);
2236       if (ncode_ident == NULL_TREE)
2237         ncode_ident = get_identifier ("ncode");
2238       if (methods_ident == NULL_TREE)
2239         methods_ident = get_identifier ("methods");
2240       ref = build3 (COMPONENT_REF, method_ptr_type_node, ref,
2241                     lookup_field (&class_type_node, methods_ident),
2242                     NULL_TREE);
2243       for (meth = TYPE_METHODS (self_type);
2244            ; meth = DECL_CHAIN (meth))
2245         {
2246           if (method == meth)
2247             break;
2248           if (meth == NULL_TREE)
2249             fatal_error ("method '%s' not found in class",
2250                          IDENTIFIER_POINTER (DECL_NAME (method)));
2251           method_index++;
2252         }
2253       method_index *= int_size_in_bytes (method_type_node);
2254       ref = fold_build_pointer_plus_hwi (ref, method_index);
2255       ref = build1 (INDIRECT_REF, method_type_node, ref);
2256       func = build3 (COMPONENT_REF, nativecode_ptr_type_node,
2257                      ref, lookup_field (&method_type_node, ncode_ident),
2258                      NULL_TREE);
2259     }
2260   return func;
2261 }
2262
2263 tree
2264 invoke_build_dtable (int is_invoke_interface, VEC(tree,gc) *arg_list)
2265 {
2266   tree dtable, objectref;
2267   tree saved = save_expr (VEC_index (tree, arg_list, 0));
2268
2269   VEC_replace (tree, arg_list, 0, saved);
2270
2271   /* If we're dealing with interfaces and if the objectref
2272      argument is an array then get the dispatch table of the class
2273      Object rather than the one from the objectref.  */
2274   objectref = (is_invoke_interface
2275                && is_array_type_p (TREE_TYPE (saved))
2276                ? build_class_ref (object_type_node) : saved);
2277
2278   if (dtable_ident == NULL_TREE)
2279     dtable_ident = get_identifier ("vtable");
2280   dtable = build_java_indirect_ref (object_type_node, objectref,
2281                                     flag_check_references);
2282   dtable = build3 (COMPONENT_REF, dtable_ptr_type, dtable,
2283                    lookup_field (&object_type_node, dtable_ident), NULL_TREE);
2284
2285   return dtable;
2286 }
2287
2288 /* Determine the index in SYMBOL_TABLE for a reference to the decl
2289    T. If this decl has not been seen before, it will be added to the
2290    [oa]table_methods. If it has, the existing table slot will be
2291    reused.  */
2292
2293 int
2294 get_symbol_table_index (tree t, tree special,
2295                         VEC(method_entry,gc) **symbol_table)
2296 {
2297   method_entry *e;
2298   unsigned i;
2299
2300   FOR_EACH_VEC_ELT (method_entry, *symbol_table, i, e)
2301     if (t == e->method && special == e->special)
2302       goto done;
2303
2304   e = VEC_safe_push (method_entry, gc, *symbol_table, NULL);
2305   e->method = t;
2306   e->special = special;
2307
2308  done:
2309   return i + 1;
2310 }
2311
2312 tree
2313 build_invokevirtual (tree dtable, tree method, tree special)
2314 {
2315   tree func;
2316   tree nativecode_ptr_ptr_type_node
2317     = build_pointer_type (nativecode_ptr_type_node);
2318   tree method_index;
2319   tree otable_index;
2320
2321   if (flag_indirect_dispatch)
2322     {
2323       gcc_assert (! CLASS_INTERFACE (TYPE_NAME (DECL_CONTEXT (method))));
2324
2325       otable_index
2326         = build_int_cst (NULL_TREE, get_symbol_table_index
2327                          (method, special,
2328                           &TYPE_OTABLE_METHODS (output_class)));
2329       method_index = build4 (ARRAY_REF, integer_type_node,
2330                              TYPE_OTABLE_DECL (output_class),
2331                              otable_index, NULL_TREE, NULL_TREE);
2332     }
2333   else
2334     {
2335       /* We fetch the DECL_VINDEX field directly here, rather than
2336          using get_method_index().  DECL_VINDEX is the true offset
2337          from the vtable base to a method, regrdless of any extra
2338          words inserted at the start of the vtable.  */
2339       method_index = DECL_VINDEX (method);
2340       method_index = size_binop (MULT_EXPR, method_index,
2341                                  TYPE_SIZE_UNIT (nativecode_ptr_ptr_type_node));
2342       if (TARGET_VTABLE_USES_DESCRIPTORS)
2343         method_index = size_binop (MULT_EXPR, method_index,
2344                                    size_int (TARGET_VTABLE_USES_DESCRIPTORS));
2345     }
2346
2347   func = fold_build_pointer_plus (dtable, method_index);
2348
2349   if (TARGET_VTABLE_USES_DESCRIPTORS)
2350     func = build1 (NOP_EXPR, nativecode_ptr_type_node, func);
2351   else
2352     {
2353       func = fold_convert (nativecode_ptr_ptr_type_node, func);
2354       func = build1 (INDIRECT_REF, nativecode_ptr_type_node, func);
2355     }
2356
2357   return func;
2358 }
2359
2360 static GTY(()) tree class_ident;
2361 tree
2362 build_invokeinterface (tree dtable, tree method)
2363 {
2364   tree interface;
2365   tree idx;
2366
2367   /* We expand invokeinterface here.  */
2368
2369   if (class_ident == NULL_TREE)
2370     class_ident = get_identifier ("class");
2371
2372   dtable = build_java_indirect_ref (dtable_type, dtable,
2373                                     flag_check_references);
2374   dtable = build3 (COMPONENT_REF, class_ptr_type, dtable,
2375                    lookup_field (&dtable_type, class_ident), NULL_TREE);
2376
2377   interface = DECL_CONTEXT (method);
2378   gcc_assert (CLASS_INTERFACE (TYPE_NAME (interface)));
2379   layout_class_methods (interface);
2380
2381   if (flag_indirect_dispatch)
2382     {
2383       int itable_index
2384         = 2 * (get_symbol_table_index
2385                (method, NULL_TREE, &TYPE_ITABLE_METHODS (output_class)));
2386       interface
2387         = build4 (ARRAY_REF,
2388                  TREE_TYPE (TREE_TYPE (TYPE_ITABLE_DECL (output_class))),
2389                  TYPE_ITABLE_DECL (output_class),
2390                   build_int_cst (NULL_TREE, itable_index-1),
2391                   NULL_TREE, NULL_TREE);
2392       idx
2393         = build4 (ARRAY_REF,
2394                  TREE_TYPE (TREE_TYPE (TYPE_ITABLE_DECL (output_class))),
2395                  TYPE_ITABLE_DECL (output_class),
2396                   build_int_cst (NULL_TREE, itable_index),
2397                   NULL_TREE, NULL_TREE);
2398       interface = convert (class_ptr_type, interface);
2399       idx = convert (integer_type_node, idx);
2400     }
2401   else
2402     {
2403       idx = build_int_cst (NULL_TREE,
2404                            get_interface_method_index (method, interface));
2405       interface = build_class_ref (interface);
2406     }
2407
2408   return build_call_nary (ptr_type_node,
2409                           build_address_of (soft_lookupinterfacemethod_node),
2410                           3, dtable, interface, idx);
2411 }
2412
2413 /* Expand one of the invoke_* opcodes.
2414    OPCODE is the specific opcode.
2415    METHOD_REF_INDEX is an index into the constant pool.
2416    NARGS is the number of arguments, or -1 if not specified. */
2417
2418 static void
2419 expand_invoke (int opcode, int method_ref_index, int nargs ATTRIBUTE_UNUSED)
2420 {
2421   tree method_signature
2422     = COMPONENT_REF_SIGNATURE(&current_jcf->cpool, method_ref_index);
2423   tree method_name = COMPONENT_REF_NAME (&current_jcf->cpool,
2424                                          method_ref_index);
2425   tree self_type
2426     = get_class_constant (current_jcf,
2427                           COMPONENT_REF_CLASS_INDEX(&current_jcf->cpool,
2428                           method_ref_index));
2429   const char *const self_name
2430     = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (self_type)));
2431   tree call, func, method, method_type;
2432   VEC(tree,gc) *arg_list;
2433   tree check = NULL_TREE;
2434
2435   tree special = NULL_TREE;
2436
2437   if (! CLASS_LOADED_P (self_type))
2438     {
2439       load_class (self_type, 1);
2440       safe_layout_class (self_type);
2441       if (TREE_CODE (TYPE_SIZE (self_type)) == ERROR_MARK)
2442         fatal_error ("failed to find class '%s'", self_name);
2443     }
2444   layout_class_methods (self_type);
2445
2446   if (ID_INIT_P (method_name))
2447     method = lookup_java_constructor (self_type, method_signature);
2448   else
2449     method = lookup_java_method (self_type, method_name, method_signature);
2450
2451   /* We've found a method in a class other than the one in which it
2452      was wanted.  This can happen if, for instance, we're trying to
2453      compile invokespecial super.equals().
2454      FIXME: This is a kludge.  Rather than nullifying the result, we
2455      should change lookup_java_method() so that it doesn't search the
2456      superclass chain when we're BC-compiling.  */
2457   if (! flag_verify_invocations
2458       && method
2459       && ! TYPE_ARRAY_P (self_type)
2460       && self_type != DECL_CONTEXT (method))
2461     method = NULL_TREE;
2462
2463   /* We've found a method in an interface, but this isn't an interface
2464      call.  */
2465   if (opcode != OPCODE_invokeinterface
2466       && method
2467       && (CLASS_INTERFACE (TYPE_NAME (DECL_CONTEXT (method)))))
2468     method = NULL_TREE;
2469
2470   /* We've found a non-interface method but we are making an
2471      interface call.  This can happen if the interface overrides a
2472      method in Object.  */
2473   if (! flag_verify_invocations
2474       && opcode == OPCODE_invokeinterface
2475       && method
2476       && ! CLASS_INTERFACE (TYPE_NAME (DECL_CONTEXT (method))))
2477     method = NULL_TREE;
2478
2479   if (method == NULL_TREE)
2480     {
2481       if (flag_verify_invocations || ! flag_indirect_dispatch)
2482         {
2483           error ("class '%s' has no method named '%s' matching signature '%s'",
2484                  self_name,
2485                  IDENTIFIER_POINTER (method_name),
2486                  IDENTIFIER_POINTER (method_signature));
2487         }
2488       else
2489         {
2490           int flags = ACC_PUBLIC;
2491           if (opcode == OPCODE_invokestatic)
2492             flags |= ACC_STATIC;
2493           if (opcode == OPCODE_invokeinterface)
2494             {
2495               flags |= ACC_INTERFACE | ACC_ABSTRACT;
2496               CLASS_INTERFACE (TYPE_NAME (self_type)) = 1;
2497             }
2498           method = add_method (self_type, flags, method_name,
2499                                method_signature);
2500           DECL_ARTIFICIAL (method) = 1;
2501           METHOD_DUMMY (method) = 1;
2502           layout_class_method (self_type, NULL,
2503                                method, NULL);
2504         }
2505     }
2506
2507   /* Invoke static can't invoke static/abstract method */
2508   if (method != NULL_TREE)
2509     {
2510       if (opcode == OPCODE_invokestatic)
2511         {
2512           if (!METHOD_STATIC (method))
2513             {
2514               error ("invokestatic on non static method");
2515               method = NULL_TREE;
2516             }
2517           else if (METHOD_ABSTRACT (method))
2518             {
2519               error ("invokestatic on abstract method");
2520               method = NULL_TREE;
2521             }
2522         }
2523       else
2524         {
2525           if (METHOD_STATIC (method))
2526             {
2527               error ("invoke[non-static] on static method");
2528               method = NULL_TREE;
2529             }
2530         }
2531     }
2532
2533   if (method == NULL_TREE)
2534     {
2535       /* If we got here, we emitted an error message above.  So we
2536          just pop the arguments, push a properly-typed zero, and
2537          continue.  */
2538       method_type = get_type_from_signature (method_signature);
2539       pop_arguments (method_type);
2540       if (opcode != OPCODE_invokestatic)
2541         pop_type (self_type);
2542       method_type = promote_type (TREE_TYPE (method_type));
2543       push_value (convert (method_type, integer_zero_node));
2544       return;
2545     }
2546
2547   method_type = TREE_TYPE (method);
2548   arg_list = pop_arguments (method_type);
2549   flush_quick_stack ();
2550
2551   maybe_rewrite_invocation (&method, &arg_list, &method_signature,
2552                             &special);
2553
2554   func = NULL_TREE;
2555   if (opcode == OPCODE_invokestatic)
2556     func = build_known_method_ref (method, method_type, self_type,
2557                                    method_signature, arg_list, special);
2558   else if (opcode == OPCODE_invokespecial
2559            || (opcode == OPCODE_invokevirtual
2560                && (METHOD_PRIVATE (method)
2561                    || METHOD_FINAL (method)
2562                    || CLASS_FINAL (TYPE_NAME (self_type)))))
2563     {
2564       /* If the object for the method call is null, we throw an
2565          exception.  We don't do this if the object is the current
2566          method's `this'.  In other cases we just rely on an
2567          optimization pass to eliminate redundant checks.  FIXME:
2568          Unfortunately there doesn't seem to be a way to determine
2569          what the current method is right now.
2570          We do omit the check if we're calling <init>.  */
2571       /* We use a SAVE_EXPR here to make sure we only evaluate
2572          the new `self' expression once.  */
2573       tree save_arg = save_expr (VEC_index (tree, arg_list, 0));
2574       VEC_replace (tree, arg_list, 0, save_arg);
2575       check = java_check_reference (save_arg, ! DECL_INIT_P (method));
2576       func = build_known_method_ref (method, method_type, self_type,
2577                                      method_signature, arg_list, special);
2578     }
2579   else
2580     {
2581       tree dtable = invoke_build_dtable (opcode == OPCODE_invokeinterface,
2582                                          arg_list);
2583       if (opcode == OPCODE_invokevirtual)
2584         func = build_invokevirtual (dtable, method, special);
2585       else
2586         func = build_invokeinterface (dtable, method);
2587     }
2588
2589   if (TREE_CODE (func) == ADDR_EXPR)
2590     TREE_TYPE (func) = build_pointer_type (method_type);
2591   else
2592     func = build1 (NOP_EXPR, build_pointer_type (method_type), func);
2593
2594   call = build_call_vec (TREE_TYPE (method_type), func, arg_list);
2595   TREE_SIDE_EFFECTS (call) = 1;
2596   call = check_for_builtin (method, call);
2597
2598   if (check != NULL_TREE)
2599     {
2600       call = build2 (COMPOUND_EXPR, TREE_TYPE (call), check, call);
2601       TREE_SIDE_EFFECTS (call) = 1;
2602     }
2603
2604   if (TREE_CODE (TREE_TYPE (method_type)) == VOID_TYPE)
2605     java_add_stmt (call);
2606   else
2607     {
2608       push_value (call);
2609       flush_quick_stack ();
2610     }
2611 }
2612
2613 /* Create a stub which will be put into the vtable but which will call
2614    a JNI function.  */
2615
2616 tree
2617 build_jni_stub (tree method)
2618 {
2619   tree jnifunc, call, body, method_sig, arg_types;
2620   tree jniarg0, jniarg1, jniarg2, jniarg3;
2621   tree jni_func_type, tem;
2622   tree env_var, res_var = NULL_TREE, block;
2623   tree method_args;
2624   tree meth_var;
2625   tree bind;
2626   VEC(tree,gc) *args = NULL;
2627   int args_size = 0;
2628
2629   tree klass = DECL_CONTEXT (method);
2630   klass = build_class_ref (klass);
2631
2632   gcc_assert (METHOD_NATIVE (method) && flag_jni);
2633
2634   DECL_ARTIFICIAL (method) = 1;
2635   DECL_EXTERNAL (method) = 0;
2636
2637   env_var = build_decl (input_location,
2638                         VAR_DECL, get_identifier ("env"), ptr_type_node);
2639   DECL_CONTEXT (env_var) = method;
2640
2641   if (TREE_TYPE (TREE_TYPE (method)) != void_type_node)
2642     {
2643       res_var = build_decl (input_location, VAR_DECL, get_identifier ("res"),
2644                             TREE_TYPE (TREE_TYPE (method)));
2645       DECL_CONTEXT (res_var) = method;
2646       DECL_CHAIN (env_var) = res_var;
2647     }
2648
2649   method_args = DECL_ARGUMENTS (method);
2650   block = build_block (env_var, NULL_TREE, method_args, NULL_TREE);
2651   TREE_SIDE_EFFECTS (block) = 1;
2652
2653   /* Compute the local `env' by calling _Jv_GetJNIEnvNewFrame.  */
2654   body = build2 (MODIFY_EXPR, ptr_type_node, env_var,
2655                  build_call_nary (ptr_type_node,
2656                                   build_address_of (soft_getjnienvnewframe_node),
2657                                   1, klass));
2658
2659   /* The JNIEnv structure is the first argument to the JNI function.  */
2660   args_size += int_size_in_bytes (TREE_TYPE (env_var));
2661   VEC_safe_push (tree, gc, args, env_var);
2662
2663   /* For a static method the second argument is the class.  For a
2664      non-static method the second argument is `this'; that is already
2665      available in the argument list.  */
2666   if (METHOD_STATIC (method))
2667     {
2668       args_size += int_size_in_bytes (TREE_TYPE (klass));
2669       VEC_safe_push (tree, gc, args, klass);
2670     }
2671
2672   /* All the arguments to this method become arguments to the
2673      underlying JNI function.  If we had to wrap object arguments in a
2674      special way, we would do that here.  */
2675   for (tem = method_args; tem != NULL_TREE; tem = DECL_CHAIN (tem))
2676     {
2677       int arg_bits = TREE_INT_CST_LOW (TYPE_SIZE (TREE_TYPE (tem)));
2678 #ifdef PARM_BOUNDARY
2679       arg_bits = (((arg_bits + PARM_BOUNDARY - 1) / PARM_BOUNDARY)
2680                   * PARM_BOUNDARY);
2681 #endif
2682       args_size += (arg_bits / BITS_PER_UNIT);
2683
2684       VEC_safe_push (tree, gc, args, tem);
2685     }
2686   arg_types = TYPE_ARG_TYPES (TREE_TYPE (method));
2687
2688   /* Argument types for static methods and the JNIEnv structure.
2689      FIXME: Write and use build_function_type_vec to avoid this.  */
2690   if (METHOD_STATIC (method))
2691     arg_types = tree_cons (NULL_TREE, object_ptr_type_node, arg_types);
2692   arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
2693
2694   /* We call _Jv_LookupJNIMethod to find the actual underlying
2695      function pointer.  _Jv_LookupJNIMethod will throw the appropriate
2696      exception if this function is not found at runtime.  */
2697   method_sig = build_java_signature (TREE_TYPE (method));
2698   jniarg0 = klass;
2699   jniarg1 = build_utf8_ref (DECL_NAME (method));
2700   jniarg2 = build_utf8_ref (unmangle_classname
2701                             (IDENTIFIER_POINTER (method_sig),
2702                              IDENTIFIER_LENGTH (method_sig)));
2703   jniarg3 = build_int_cst (NULL_TREE, args_size);
2704
2705   tem = build_function_type (TREE_TYPE (TREE_TYPE (method)), arg_types);
2706
2707 #ifdef MODIFY_JNI_METHOD_CALL
2708   tem = MODIFY_JNI_METHOD_CALL (tem);
2709 #endif
2710
2711   jni_func_type = build_pointer_type (tem);
2712
2713   /* Use the actual function type, rather than a generic pointer type,
2714      such that this decl keeps the actual pointer type from being
2715      garbage-collected.  If it is, we end up using canonical types
2716      with different uids for equivalent function types, and this in
2717      turn causes utf8 identifiers and output order to vary.  */
2718   meth_var = build_decl (input_location,
2719                          VAR_DECL, get_identifier ("meth"), jni_func_type);
2720   TREE_STATIC (meth_var) = 1;
2721   TREE_PUBLIC (meth_var) = 0;
2722   DECL_EXTERNAL (meth_var) = 0;
2723   DECL_CONTEXT (meth_var) = method;
2724   DECL_ARTIFICIAL (meth_var) = 1;
2725   DECL_INITIAL (meth_var) = null_pointer_node;
2726   TREE_USED (meth_var) = 1;
2727   chainon (env_var, meth_var);
2728   build_result_decl (method);
2729
2730   jnifunc = build3 (COND_EXPR, jni_func_type,
2731                     build2 (NE_EXPR, boolean_type_node,
2732                             meth_var, build_int_cst (TREE_TYPE (meth_var), 0)),
2733                     meth_var,
2734                     build2 (MODIFY_EXPR, jni_func_type, meth_var,
2735                             build1
2736                             (NOP_EXPR, jni_func_type,
2737                              build_call_nary (ptr_type_node,
2738                                               build_address_of
2739                                               (soft_lookupjnimethod_node),
2740                                               4,
2741                                               jniarg0, jniarg1,
2742                                               jniarg2, jniarg3))));
2743
2744   /* Now we make the actual JNI call via the resulting function
2745      pointer.    */
2746   call = build_call_vec (TREE_TYPE (TREE_TYPE (method)), jnifunc, args);
2747
2748   /* If the JNI call returned a result, capture it here.  If we had to
2749      unwrap JNI object results, we would do that here.  */
2750   if (res_var != NULL_TREE)
2751     {
2752       /* If the call returns an object, it may return a JNI weak
2753          reference, in which case we must unwrap it.  */
2754       if (! JPRIMITIVE_TYPE_P (TREE_TYPE (TREE_TYPE (method))))
2755         call = build_call_nary (TREE_TYPE (TREE_TYPE (method)),
2756                                 build_address_of (soft_unwrapjni_node),
2757                                 1, call);
2758       call = build2 (MODIFY_EXPR, TREE_TYPE (TREE_TYPE (method)),
2759                      res_var, call);
2760     }
2761
2762   TREE_SIDE_EFFECTS (call) = 1;
2763
2764   body = build2 (COMPOUND_EXPR, void_type_node, body, call);
2765   TREE_SIDE_EFFECTS (body) = 1;
2766
2767   /* Now free the environment we allocated.  */
2768   call = build_call_nary (ptr_type_node,
2769                           build_address_of (soft_jnipopsystemframe_node),
2770                           1, env_var);
2771   TREE_SIDE_EFFECTS (call) = 1;
2772   body = build2 (COMPOUND_EXPR, void_type_node, body, call);
2773   TREE_SIDE_EFFECTS (body) = 1;
2774
2775   /* Finally, do the return.  */
2776   if (res_var != NULL_TREE)
2777     {
2778       tree drt;
2779       gcc_assert (DECL_RESULT (method));
2780       /* Make sure we copy the result variable to the actual
2781          result.  We use the type of the DECL_RESULT because it
2782          might be different from the return type of the function:
2783          it might be promoted.  */
2784       drt = TREE_TYPE (DECL_RESULT (method));
2785       if (drt != TREE_TYPE (res_var))
2786         res_var = build1 (CONVERT_EXPR, drt, res_var);
2787       res_var = build2 (MODIFY_EXPR, drt, DECL_RESULT (method), res_var);
2788       TREE_SIDE_EFFECTS (res_var) = 1;
2789     }
2790
2791   body = build2 (COMPOUND_EXPR, void_type_node, body,
2792                  build1 (RETURN_EXPR, void_type_node, res_var));
2793   TREE_SIDE_EFFECTS (body) = 1;
2794
2795   /* Prepend class initialization for static methods reachable from
2796      other classes.  */
2797   if (METHOD_STATIC (method)
2798       && (! METHOD_PRIVATE (method)
2799           || INNER_CLASS_P (DECL_CONTEXT (method))))
2800     {
2801       tree init = build_call_expr (soft_initclass_node, 1,
2802                                    klass);
2803       body = build2 (COMPOUND_EXPR, void_type_node, init, body);
2804       TREE_SIDE_EFFECTS (body) = 1;
2805     }
2806
2807   bind = build3 (BIND_EXPR, void_type_node, BLOCK_VARS (block),
2808                  body, block);
2809   return bind;
2810 }
2811
2812
2813 /* Given lvalue EXP, return a volatile expression that references the
2814    same object.  */
2815
2816 tree
2817 java_modify_addr_for_volatile (tree exp)
2818 {
2819   tree exp_type = TREE_TYPE (exp);
2820   tree v_type
2821     = build_qualified_type (exp_type,
2822                             TYPE_QUALS (exp_type) | TYPE_QUAL_VOLATILE);
2823   tree addr = build_fold_addr_expr (exp);
2824   v_type = build_pointer_type (v_type);
2825   addr = fold_convert (v_type, addr);
2826   exp = build_fold_indirect_ref (addr);
2827   return exp;
2828 }
2829
2830
2831 /* Expand an operation to extract from or store into a field.
2832    IS_STATIC is 1 iff the field is static.
2833    IS_PUTTING is 1 for putting into a field;  0 for getting from the field.
2834    FIELD_REF_INDEX is an index into the constant pool.  */
2835
2836 static void
2837 expand_java_field_op (int is_static, int is_putting, int field_ref_index)
2838 {
2839   tree self_type
2840     = get_class_constant (current_jcf,
2841                           COMPONENT_REF_CLASS_INDEX (&current_jcf->cpool,
2842                           field_ref_index));
2843   const char *self_name
2844     = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (self_type)));
2845   tree field_name = COMPONENT_REF_NAME (&current_jcf->cpool, field_ref_index);
2846   tree field_signature = COMPONENT_REF_SIGNATURE (&current_jcf->cpool,
2847                                                   field_ref_index);
2848   tree field_type = get_type_from_signature (field_signature);
2849   tree new_value = is_putting ? pop_value (field_type) : NULL_TREE;
2850   tree field_ref;
2851   int is_error = 0;
2852   tree original_self_type = self_type;
2853   tree field_decl;
2854   tree modify_expr;
2855
2856   if (! CLASS_LOADED_P (self_type))
2857     load_class (self_type, 1);
2858   field_decl = lookup_field (&self_type, field_name);
2859   if (field_decl == error_mark_node)
2860     {
2861       is_error = 1;
2862     }
2863   else if (field_decl == NULL_TREE)
2864     {
2865       if (! flag_verify_invocations)
2866         {
2867           int flags = ACC_PUBLIC;
2868           if (is_static)
2869             flags |= ACC_STATIC;
2870           self_type = original_self_type;
2871           field_decl = add_field (original_self_type, field_name,
2872                                   field_type, flags);
2873           DECL_ARTIFICIAL (field_decl) = 1;
2874           DECL_IGNORED_P (field_decl) = 1;
2875 #if 0
2876           /* FIXME: We should be pessimistic about volatility.  We
2877              don't know one way or another, but this is safe.
2878              However, doing this has bad effects on code quality.  We
2879              need to look at better ways to do this.  */
2880           TREE_THIS_VOLATILE (field_decl) = 1;
2881 #endif
2882         }
2883       else
2884         {
2885           error ("missing field '%s' in '%s'",
2886                  IDENTIFIER_POINTER (field_name), self_name);
2887           is_error = 1;
2888       }
2889     }
2890   else if (build_java_signature (TREE_TYPE (field_decl)) != field_signature)
2891     {
2892       error ("mismatching signature for field '%s' in '%s'",
2893              IDENTIFIER_POINTER (field_name), self_name);
2894       is_error = 1;
2895     }
2896   field_ref = is_static ? NULL_TREE : pop_value (self_type);
2897   if (is_error)
2898     {
2899       if (! is_putting)
2900         push_value (convert (field_type, integer_zero_node));
2901       flush_quick_stack ();
2902       return;
2903     }
2904
2905   field_ref = build_field_ref (field_ref, self_type, field_name);
2906   if (is_static
2907       && ! flag_indirect_dispatch)
2908     {
2909       tree context = DECL_CONTEXT (field_ref);
2910       if (context != self_type && CLASS_INTERFACE (TYPE_NAME (context)))
2911         field_ref = build_class_init (context, field_ref);
2912       else
2913         field_ref = build_class_init (self_type, field_ref);
2914     }
2915   if (is_putting)
2916     {
2917       flush_quick_stack ();
2918       if (FIELD_FINAL (field_decl))
2919         {
2920           if (DECL_CONTEXT (field_decl) != current_class)
2921             error ("assignment to final field %q+D not in field%'s class",
2922                    field_decl);
2923           /* We used to check for assignments to final fields not
2924              occurring in the class initializer or in a constructor
2925              here.  However, this constraint doesn't seem to be
2926              enforced by the JVM.  */
2927         }
2928
2929       if (TREE_THIS_VOLATILE (field_decl))
2930         field_ref = java_modify_addr_for_volatile (field_ref);
2931
2932       modify_expr = build2 (MODIFY_EXPR, TREE_TYPE (field_ref),
2933                             field_ref, new_value);
2934
2935       if (TREE_THIS_VOLATILE (field_decl))
2936         java_add_stmt
2937           (build_call_expr (built_in_decls[BUILT_IN_SYNC_SYNCHRONIZE], 0));
2938
2939       java_add_stmt (modify_expr);
2940     }
2941   else
2942     {
2943       tree temp = build_decl (input_location,
2944                               VAR_DECL, NULL_TREE, TREE_TYPE (field_ref));
2945       java_add_local_var (temp);
2946
2947       if (TREE_THIS_VOLATILE (field_decl))
2948         field_ref = java_modify_addr_for_volatile (field_ref);
2949
2950       modify_expr
2951         = build2 (MODIFY_EXPR, TREE_TYPE (field_ref), temp, field_ref);
2952       java_add_stmt (modify_expr);
2953
2954       if (TREE_THIS_VOLATILE (field_decl))
2955         java_add_stmt
2956           (build_call_expr (built_in_decls[BUILT_IN_SYNC_SYNCHRONIZE], 0));
2957
2958       push_value (temp);
2959     }
2960   TREE_THIS_VOLATILE (field_ref) = TREE_THIS_VOLATILE (field_decl);
2961 }
2962
2963 static void
2964 load_type_state (int pc)
2965 {
2966   int i;
2967   tree vec = VEC_index (tree, type_states, pc);
2968   int cur_length = TREE_VEC_LENGTH (vec);
2969   stack_pointer = cur_length - DECL_MAX_LOCALS(current_function_decl);
2970   for (i = 0; i < cur_length; i++)
2971     type_map [i] = TREE_VEC_ELT (vec, i);
2972 }
2973
2974 /* Go over METHOD's bytecode and note instruction starts in
2975    instruction_bits[].  */
2976
2977 void
2978 note_instructions (JCF *jcf, tree method)
2979 {
2980   int PC;
2981   unsigned char* byte_ops;
2982   long length = DECL_CODE_LENGTH (method);
2983
2984   int saw_index;
2985   jint INT_temp;
2986
2987 #undef RET /* Defined by config/i386/i386.h */
2988 #undef PTR
2989 #define BCODE byte_ops
2990 #define BYTE_type_node byte_type_node
2991 #define SHORT_type_node short_type_node
2992 #define INT_type_node int_type_node
2993 #define LONG_type_node long_type_node
2994 #define CHAR_type_node char_type_node
2995 #define PTR_type_node ptr_type_node
2996 #define FLOAT_type_node float_type_node
2997 #define DOUBLE_type_node double_type_node
2998 #define VOID_type_node void_type_node
2999 #define CONST_INDEX_1 (saw_index = 1, IMMEDIATE_u1)
3000 #define CONST_INDEX_2 (saw_index = 1, IMMEDIATE_u2)
3001 #define VAR_INDEX_1 (saw_index = 1, IMMEDIATE_u1)
3002 #define VAR_INDEX_2 (saw_index = 1, IMMEDIATE_u2)
3003
3004 #define CHECK_PC_IN_RANGE(PC) ((void)1) /* Already handled by verifier. */
3005
3006   JCF_SEEK (jcf, DECL_CODE_OFFSET (method));
3007   byte_ops = jcf->read_ptr;
3008   instruction_bits = XRESIZEVAR (char, instruction_bits, length + 1);
3009   memset (instruction_bits, 0, length + 1);
3010   type_states = VEC_alloc (tree, gc, length + 1);
3011   VEC_safe_grow_cleared (tree, gc, type_states, length + 1);
3012
3013   /* This pass figures out which PC can be the targets of jumps. */
3014   for (PC = 0; PC < length;)
3015     {
3016       int oldpc = PC; /* PC at instruction start. */
3017       instruction_bits [PC] |=  BCODE_INSTRUCTION_START;
3018       switch (byte_ops[PC++])
3019         {
3020 #define JAVAOP(OPNAME, OPCODE, OPKIND, OPERAND_TYPE, OPERAND_VALUE) \
3021         case OPCODE: \
3022           PRE_##OPKIND(OPERAND_TYPE, OPERAND_VALUE); \
3023           break;
3024
3025 #define NOTE_LABEL(PC) note_label(oldpc, PC)
3026
3027 #define PRE_PUSHC(OPERAND_TYPE, OPERAND_VALUE) (void)(OPERAND_VALUE);
3028 #define PRE_LOAD(OPERAND_TYPE, OPERAND_VALUE) (void)(OPERAND_VALUE);
3029 #define PRE_STORE(OPERAND_TYPE, OPERAND_VALUE) (void)(OPERAND_VALUE);
3030 #define PRE_STACK(OPERAND_TYPE, OPERAND_VALUE) /* nothing */
3031 #define PRE_UNOP(OPERAND_TYPE, OPERAND_VALUE) /* nothing */
3032 #define PRE_BINOP(OPERAND_TYPE, OPERAND_VALUE) /* nothing */
3033 #define PRE_CONVERT(OPERAND_TYPE, OPERAND_VALUE) /* nothing */
3034 #define PRE_CONVERT2(OPERAND_TYPE, OPERAND_VALUE) /* nothing */
3035
3036 #define PRE_SPECIAL(OPERAND_TYPE, INSTRUCTION) \
3037   PRE_SPECIAL_##INSTRUCTION(OPERAND_TYPE)
3038 #define PRE_SPECIAL_IINC(OPERAND_TYPE) \
3039   ((void) IMMEDIATE_u1, (void) IMMEDIATE_s1)
3040 #define PRE_SPECIAL_ENTER(IGNORE) /* nothing */
3041 #define PRE_SPECIAL_EXIT(IGNORE) /* nothing */
3042 #define PRE_SPECIAL_THROW(IGNORE) /* nothing */
3043 #define PRE_SPECIAL_BREAK(IGNORE) /* nothing */
3044
3045 /* two forms of wide instructions */
3046 #define PRE_SPECIAL_WIDE(IGNORE) \
3047   { \
3048     int modified_opcode = IMMEDIATE_u1; \
3049     if (modified_opcode == OPCODE_iinc) \
3050       { \
3051         (void) IMMEDIATE_u2;    /* indexbyte1 and indexbyte2 */ \
3052         (void) IMMEDIATE_s2;    /* constbyte1 and constbyte2 */ \
3053       } \
3054     else \
3055       { \
3056         (void) IMMEDIATE_u2;    /* indexbyte1 and indexbyte2 */ \
3057       } \
3058   }
3059
3060 #define PRE_IMPL(IGNORE1, IGNORE2) /* nothing */
3061
3062 #define PRE_MONITOR(OPERAND_TYPE, OPERAND_VALUE) /* nothing */
3063
3064 #define PRE_RETURN(OPERAND_TYPE, OPERAND_VALUE) /* nothing */
3065 #define PRE_ARRAY(OPERAND_TYPE, SUBOP) \
3066           PRE_ARRAY_##SUBOP(OPERAND_TYPE)
3067 #define PRE_ARRAY_LOAD(TYPE) /* nothing */
3068 #define PRE_ARRAY_STORE(TYPE) /* nothing */
3069 #define PRE_ARRAY_LENGTH(TYPE) /* nothing */
3070 #define PRE_ARRAY_NEW(TYPE) PRE_ARRAY_NEW_##TYPE
3071 #define PRE_ARRAY_NEW_NUM ((void) IMMEDIATE_u1)
3072 #define PRE_ARRAY_NEW_PTR ((void) IMMEDIATE_u2)
3073 #define PRE_ARRAY_NEW_MULTI ((void) IMMEDIATE_u2, (void) IMMEDIATE_u1)
3074
3075 #define PRE_TEST(OPERAND_TYPE, OPERAND_VALUE) NOTE_LABEL (oldpc+IMMEDIATE_s2)
3076 #define PRE_COND(OPERAND_TYPE, OPERAND_VALUE) NOTE_LABEL (oldpc+IMMEDIATE_s2)
3077 #define PRE_BRANCH(OPERAND_TYPE, OPERAND_VALUE) \
3078   saw_index = 0;  INT_temp = (OPERAND_VALUE); \
3079   if (!saw_index)  NOTE_LABEL(oldpc + INT_temp);
3080 #define PRE_JSR(OPERAND_TYPE, OPERAND_VALUE) \
3081   saw_index = 0;  INT_temp = (OPERAND_VALUE); \
3082   NOTE_LABEL (PC); \
3083   if (!saw_index)  NOTE_LABEL(oldpc + INT_temp);
3084
3085 #define PRE_RET(OPERAND_TYPE, OPERAND_VALUE)  (void)(OPERAND_VALUE)
3086
3087 #define PRE_SWITCH(OPERAND_TYPE, TABLE_OR_LOOKUP) \
3088   PC = (PC + 3) / 4 * 4; PRE_##TABLE_OR_LOOKUP##_SWITCH
3089
3090 #define PRE_LOOKUP_SWITCH                                               \
3091   { jint default_offset = IMMEDIATE_s4;  jint npairs = IMMEDIATE_s4;    \
3092     NOTE_LABEL (default_offset+oldpc);                                  \
3093     if (npairs >= 0)                                                    \
3094       while (--npairs >= 0) {                                           \
3095        jint match ATTRIBUTE_UNUSED = IMMEDIATE_s4;                      \
3096        jint offset = IMMEDIATE_s4;                                      \
3097        NOTE_LABEL (offset+oldpc); }                                     \
3098   }
3099
3100 #define PRE_TABLE_SWITCH                                \
3101   { jint default_offset = IMMEDIATE_s4;                 \
3102     jint low = IMMEDIATE_s4; jint high = IMMEDIATE_s4;  \
3103     NOTE_LABEL (default_offset+oldpc);                  \
3104     if (low <= high)                                    \
3105      while (low++ <= high) {                            \
3106        jint offset = IMMEDIATE_s4;                      \
3107        NOTE_LABEL (offset+oldpc); }                     \
3108   }
3109
3110 #define PRE_FIELD(MAYBE_STATIC, PUT_OR_GET) (void)(IMMEDIATE_u2);
3111 #define PRE_OBJECT(MAYBE_STATIC, PUT_OR_GET) (void)(IMMEDIATE_u2);
3112 #define PRE_INVOKE(MAYBE_STATIC, IS_INTERFACE) \
3113   (void)(IMMEDIATE_u2); \
3114   PC += 2 * IS_INTERFACE /* for invokeinterface */;
3115
3116 #include "javaop.def"
3117 #undef JAVAOP
3118         }
3119     } /* for */
3120 }
3121
3122 void
3123 expand_byte_code (JCF *jcf, tree method)
3124 {
3125   int PC;
3126   int i;
3127   const unsigned char *linenumber_pointer;
3128   int dead_code_index = -1;
3129   unsigned char* byte_ops;
3130   long length = DECL_CODE_LENGTH (method);
3131   location_t max_location = input_location;
3132
3133   stack_pointer = 0;
3134   JCF_SEEK (jcf, DECL_CODE_OFFSET (method));
3135   byte_ops = jcf->read_ptr;
3136
3137   /* We make an initial pass of the line number table, to note
3138      which instructions have associated line number entries. */
3139   linenumber_pointer = linenumber_table;
3140   for (i = 0; i < linenumber_count; i++)
3141     {
3142       int pc = GET_u2 (linenumber_pointer);
3143       linenumber_pointer += 4;
3144       if (pc >= length)
3145         warning (0, "invalid PC in line number table");
3146       else
3147         {
3148           if ((instruction_bits[pc] & BCODE_HAS_LINENUMBER) != 0)
3149             instruction_bits[pc] |= BCODE_HAS_MULTI_LINENUMBERS;
3150           instruction_bits[pc] |= BCODE_HAS_LINENUMBER;
3151         }
3152     }
3153
3154   if (! verify_jvm_instructions_new (jcf, byte_ops, length))
3155     return;
3156
3157   promote_arguments ();
3158   cache_this_class_ref (method);
3159   cache_cpool_data_ref ();
3160
3161   /* Translate bytecodes.  */
3162   linenumber_pointer = linenumber_table;
3163   for (PC = 0; PC < length;)
3164     {
3165       if ((instruction_bits [PC] & BCODE_TARGET) != 0 || PC == 0)
3166         {
3167           tree label = lookup_label (PC);
3168           flush_quick_stack ();
3169           if ((instruction_bits [PC] & BCODE_TARGET) != 0)
3170             java_add_stmt (build1 (LABEL_EXPR, void_type_node, label));
3171           if ((instruction_bits[PC] & BCODE_VERIFIED) != 0)
3172             load_type_state (PC);
3173         }
3174
3175       if (! (instruction_bits [PC] & BCODE_VERIFIED))
3176         {
3177           if (dead_code_index == -1)
3178             {
3179               /* This is the start of a region of unreachable bytecodes.
3180                  They still need to be processed in order for EH ranges
3181                  to get handled correctly.  However, we can simply
3182                  replace these bytecodes with nops.  */
3183               dead_code_index = PC;
3184             }
3185
3186           /* Turn this bytecode into a nop.  */
3187           byte_ops[PC] = 0x0;
3188         }
3189        else
3190         {
3191           if (dead_code_index != -1)
3192             {
3193               /* We've just reached the end of a region of dead code.  */
3194               if (extra_warnings)
3195                 warning (0, "unreachable bytecode from %d to before %d",
3196                          dead_code_index, PC);
3197               dead_code_index = -1;
3198             }
3199         }
3200
3201       /* Handle possible line number entry for this PC.
3202
3203          This code handles out-of-order and multiple linenumbers per PC,
3204          but is optimized for the case of line numbers increasing
3205          monotonically with PC. */
3206       if ((instruction_bits[PC] & BCODE_HAS_LINENUMBER) != 0)
3207         {
3208           if ((instruction_bits[PC] & BCODE_HAS_MULTI_LINENUMBERS) != 0
3209               || GET_u2 (linenumber_pointer) != PC)
3210             linenumber_pointer = linenumber_table;
3211           while (linenumber_pointer < linenumber_table + linenumber_count * 4)
3212             {
3213               int pc = GET_u2 (linenumber_pointer);
3214               linenumber_pointer += 4;
3215               if (pc == PC)
3216                 {
3217                   int line = GET_u2 (linenumber_pointer - 2);
3218                   input_location = linemap_line_start (line_table, line, 1);
3219                   if (input_location > max_location)
3220                     max_location = input_location;
3221                   if (!(instruction_bits[PC] & BCODE_HAS_MULTI_LINENUMBERS))
3222                     break;
3223                 }
3224             }
3225         }
3226       maybe_pushlevels (PC);
3227       PC = process_jvm_instruction (PC, byte_ops, length);
3228       maybe_poplevels (PC);
3229     } /* for */
3230
3231   uncache_this_class_ref (method);
3232
3233   if (dead_code_index != -1)
3234     {
3235       /* We've just reached the end of a region of dead code.  */
3236       if (extra_warnings)
3237         warning (0, "unreachable bytecode from %d to the end of the method",
3238                  dead_code_index);
3239     }
3240
3241   DECL_FUNCTION_LAST_LINE (method) = max_location;
3242 }
3243
3244 static void
3245 java_push_constant_from_pool (JCF *jcf, int index)
3246 {
3247   tree c;
3248   if (JPOOL_TAG (jcf, index) == CONSTANT_String)
3249     {
3250       tree name;
3251       name = get_name_constant (jcf, JPOOL_USHORT1 (jcf, index));
3252       index = alloc_name_constant (CONSTANT_String, name);
3253       c = build_ref_from_constant_pool (index);
3254       c = convert (promote_type (string_type_node), c);
3255     }
3256   else if (JPOOL_TAG (jcf, index) == CONSTANT_Class
3257            || JPOOL_TAG (jcf, index) == CONSTANT_ResolvedClass)
3258     {
3259       tree record = get_class_constant (jcf, index);
3260       c = build_class_ref (record);
3261     }
3262   else
3263     c = get_constant (jcf, index);
3264   push_value (c);
3265 }
3266
3267 int
3268 process_jvm_instruction (int PC, const unsigned char* byte_ops,
3269                          long length ATTRIBUTE_UNUSED)
3270 {
3271   const char *opname; /* Temporary ??? */
3272   int oldpc = PC; /* PC at instruction start. */
3273
3274   /* If the instruction is at the beginning of an exception handler,
3275      replace the top of the stack with the thrown object reference.  */
3276   if (instruction_bits [PC] & BCODE_EXCEPTION_TARGET)
3277     {
3278       /* Note that the verifier will not emit a type map at all for
3279          dead exception handlers.  In this case we just ignore the
3280          situation.  */
3281       if ((instruction_bits[PC] & BCODE_VERIFIED) != 0)
3282         {
3283           tree type = pop_type (promote_type (throwable_type_node));
3284           push_value (build_exception_object_ref (type));
3285         }
3286     }
3287
3288   switch (byte_ops[PC++])
3289     {
3290 #define JAVAOP(OPNAME, OPCODE, OPKIND, OPERAND_TYPE, OPERAND_VALUE) \
3291     case OPCODE: \
3292       opname = #OPNAME; \
3293       OPKIND(OPERAND_TYPE, OPERAND_VALUE); \
3294       break;
3295
3296 #define RET(OPERAND_TYPE, OPERAND_VALUE)                                \
3297   {                                                                     \
3298     int saw_index = 0;                                                  \
3299     int index     = OPERAND_VALUE;                                      \
3300     (void) saw_index; /* Avoid set but not used warning.  */            \
3301     build_java_ret                                                      \
3302       (find_local_variable (index, return_address_type_node, oldpc));   \
3303   }
3304
3305 #define JSR(OPERAND_TYPE, OPERAND_VALUE) \
3306   {                                                 \
3307     /* OPERAND_VALUE may have side-effects on PC */ \
3308     int opvalue = OPERAND_VALUE;                    \
3309     build_java_jsr (oldpc + opvalue, PC);           \
3310   }
3311
3312 /* Push a constant onto the stack. */
3313 #define PUSHC(OPERAND_TYPE, OPERAND_VALUE) \
3314   { int saw_index = 0;  int ival = (OPERAND_VALUE); \
3315     if (saw_index) java_push_constant_from_pool (current_jcf, ival); \
3316     else expand_java_pushc (ival, OPERAND_TYPE##_type_node); }
3317
3318 /* internal macro added for use by the WIDE case */
3319 #define LOAD_INTERNAL(OPTYPE, OPVALUE) \
3320   expand_load_internal (OPVALUE, type_map[OPVALUE], oldpc);
3321
3322 /* Push local variable onto the opcode stack. */
3323 #define LOAD(OPERAND_TYPE, OPERAND_VALUE) \
3324   { \
3325     /* have to do this since OPERAND_VALUE may have side-effects */ \
3326     int opvalue = OPERAND_VALUE; \
3327     LOAD_INTERNAL(OPERAND_TYPE##_type_node, opvalue); \
3328   }
3329
3330 #define RETURN(OPERAND_TYPE, OPERAND_VALUE) \
3331   expand_java_return (OPERAND_TYPE##_type_node)
3332
3333 #define REM_EXPR TRUNC_MOD_EXPR
3334 #define BINOP(OPERAND_TYPE, OPERAND_VALUE) \
3335   expand_java_binop (OPERAND_TYPE##_type_node, OPERAND_VALUE##_EXPR)
3336
3337 #define FIELD(IS_STATIC, IS_PUT) \
3338   expand_java_field_op (IS_STATIC, IS_PUT, IMMEDIATE_u2)
3339
3340 #define TEST(OPERAND_TYPE, CONDITION) \
3341   expand_test (CONDITION##_EXPR, OPERAND_TYPE##_type_node, oldpc+IMMEDIATE_s2)
3342
3343 #define COND(OPERAND_TYPE, CONDITION) \
3344   expand_cond (CONDITION##_EXPR, OPERAND_TYPE##_type_node, oldpc+IMMEDIATE_s2)
3345
3346 #define BRANCH(OPERAND_TYPE, OPERAND_VALUE) \
3347   BRANCH_##OPERAND_TYPE (OPERAND_VALUE)
3348
3349 #define BRANCH_GOTO(OPERAND_VALUE) \
3350   expand_java_goto (oldpc + OPERAND_VALUE)
3351
3352 #define BRANCH_CALL(OPERAND_VALUE) \
3353   expand_java_call (oldpc + OPERAND_VALUE, oldpc)
3354
3355 #if 0
3356 #define BRANCH_RETURN(OPERAND_VALUE) \
3357   { \
3358     tree type = OPERAND_TYPE##_type_node; \
3359     tree value = find_local_variable (OPERAND_VALUE, type, oldpc); \
3360     expand_java_ret (value); \
3361   }
3362 #endif
3363
3364 #define NOT_IMPL(OPERAND_TYPE, OPERAND_VALUE) \
3365           fprintf (stderr, "%3d: %s ", oldpc, opname); \
3366           fprintf (stderr, "(not implemented)\n")
3367 #define NOT_IMPL1(OPERAND_VALUE) \
3368           fprintf (stderr, "%3d: %s ", oldpc, opname); \
3369           fprintf (stderr, "(not implemented)\n")
3370
3371 #define BRANCH_RETURN(OPERAND_VALUE) NOT_IMPL1(OPERAND_VALUE)
3372
3373 #define STACK(SUBOP, COUNT) STACK_##SUBOP (COUNT)
3374
3375 #define STACK_POP(COUNT) java_stack_pop (COUNT)
3376
3377 #define STACK_SWAP(COUNT) java_stack_swap()
3378
3379 #define STACK_DUP(COUNT) java_stack_dup (COUNT, 0)
3380 #define STACK_DUPx1(COUNT) java_stack_dup (COUNT, 1)
3381 #define STACK_DUPx2(COUNT) java_stack_dup (COUNT, 2)
3382
3383 #define SWITCH(OPERAND_TYPE, TABLE_OR_LOOKUP) \
3384   PC = (PC + 3) / 4 * 4; TABLE_OR_LOOKUP##_SWITCH
3385
3386 #define LOOKUP_SWITCH \
3387   { jint default_offset = IMMEDIATE_s4;  jint npairs = IMMEDIATE_s4; \
3388     tree selector = pop_value (INT_type_node); \
3389     tree switch_expr = expand_java_switch (selector, oldpc + default_offset); \
3390     while (--npairs >= 0) \
3391       { \
3392         jint match = IMMEDIATE_s4; jint offset = IMMEDIATE_s4; \
3393         expand_java_add_case (switch_expr, match, oldpc + offset); \
3394       } \
3395   }
3396
3397 #define TABLE_SWITCH \
3398   { jint default_offset = IMMEDIATE_s4; \
3399     jint low = IMMEDIATE_s4; jint high = IMMEDIATE_s4; \
3400     tree selector = pop_value (INT_type_node); \
3401     tree switch_expr = expand_java_switch (selector, oldpc + default_offset); \
3402     for (; low <= high; low++) \
3403       { \
3404         jint offset = IMMEDIATE_s4; \
3405         expand_java_add_case (switch_expr, low, oldpc + offset); \
3406       } \
3407   }
3408
3409 #define INVOKE(MAYBE_STATIC, IS_INTERFACE) \
3410   { int opcode = byte_ops[PC-1]; \
3411     int method_ref_index = IMMEDIATE_u2; \
3412     int nargs; \
3413     if (IS_INTERFACE) { nargs = IMMEDIATE_u1;  (void) IMMEDIATE_u1; } \
3414     else nargs = -1; \
3415     expand_invoke (opcode, method_ref_index, nargs); \
3416   }
3417
3418 /* Handle new, checkcast, instanceof */
3419 #define OBJECT(TYPE, OP) \
3420   expand_java_##OP (get_class_constant (current_jcf, IMMEDIATE_u2))
3421
3422 #define ARRAY(OPERAND_TYPE, SUBOP) ARRAY_##SUBOP(OPERAND_TYPE)
3423
3424 #define ARRAY_LOAD(OPERAND_TYPE)                        \
3425   {                                                     \
3426     expand_java_arrayload( OPERAND_TYPE##_type_node );  \
3427   }
3428
3429 #define ARRAY_STORE(OPERAND_TYPE)                       \
3430   {                                                     \
3431     expand_java_arraystore( OPERAND_TYPE##_type_node ); \
3432   }
3433
3434 #define ARRAY_LENGTH(OPERAND_TYPE) expand_java_array_length();
3435 #define ARRAY_NEW(OPERAND_TYPE) ARRAY_NEW_##OPERAND_TYPE()
3436 #define ARRAY_NEW_PTR()                                                 \
3437     push_value (build_anewarray (get_class_constant (current_jcf,       \
3438                                                      IMMEDIATE_u2),     \
3439                                  pop_value (int_type_node)));
3440 #define ARRAY_NEW_NUM()                         \
3441   {                                             \
3442     int atype = IMMEDIATE_u1;                   \
3443     push_value (build_newarray (atype, pop_value (int_type_node)));\
3444   }
3445 #define ARRAY_NEW_MULTI()                                       \
3446   {                                                             \
3447     tree klass = get_class_constant (current_jcf, IMMEDIATE_u2 );       \
3448     int  ndims = IMMEDIATE_u1;                                  \
3449     expand_java_multianewarray( klass, ndims );                 \
3450   }
3451
3452 #define UNOP(OPERAND_TYPE, OPERAND_VALUE) \
3453   push_value (fold_build1 (NEGATE_EXPR, OPERAND_TYPE##_type_node, \
3454                            pop_value (OPERAND_TYPE##_type_node)));
3455
3456 #define CONVERT2(FROM_TYPE, TO_TYPE)                                     \
3457   {                                                                      \
3458     push_value (build1 (NOP_EXPR, int_type_node,                         \
3459                         (convert (TO_TYPE##_type_node,                   \
3460                                   pop_value (FROM_TYPE##_type_node))))); \
3461   }
3462
3463 #define CONVERT(FROM_TYPE, TO_TYPE)                             \
3464   {                                                             \
3465     push_value (convert (TO_TYPE##_type_node,                   \
3466                          pop_value (FROM_TYPE##_type_node)));   \
3467   }
3468
3469 /* internal macro added for use by the WIDE case
3470    Added TREE_TYPE (decl) assignment, apbianco  */
3471 #define STORE_INTERNAL(OPTYPE, OPVALUE)                         \
3472   {                                                             \
3473     tree decl, value;                                           \
3474     int index = OPVALUE;                                        \
3475     tree type = OPTYPE;                                         \
3476     value = pop_value (type);                                   \
3477     type = TREE_TYPE (value);                                   \
3478     decl = find_local_variable (index, type, oldpc);            \
3479     set_local_type (index, type);                               \
3480     java_add_stmt (build2 (MODIFY_EXPR, type, decl, value));    \
3481   }
3482
3483 #define STORE(OPERAND_TYPE, OPERAND_VALUE) \
3484   { \
3485     /* have to do this since OPERAND_VALUE may have side-effects */ \
3486     int opvalue = OPERAND_VALUE; \
3487     STORE_INTERNAL(OPERAND_TYPE##_type_node, opvalue); \
3488   }
3489
3490 #define SPECIAL(OPERAND_TYPE, INSTRUCTION) \
3491   SPECIAL_##INSTRUCTION(OPERAND_TYPE)
3492
3493 #define SPECIAL_ENTER(IGNORED) MONITOR_OPERATION (soft_monitorenter_node)
3494 #define SPECIAL_EXIT(IGNORED)  MONITOR_OPERATION (soft_monitorexit_node)
3495
3496 #define MONITOR_OPERATION(call)                 \
3497   {                                             \
3498     tree o = pop_value (ptr_type_node);         \
3499     tree c;                                     \
3500     flush_quick_stack ();                       \
3501     c = build_java_monitor (call, o);           \
3502     TREE_SIDE_EFFECTS (c) = 1;                  \
3503     java_add_stmt (c);                          \
3504   }
3505
3506 #define SPECIAL_IINC(IGNORED) \
3507   { \
3508     unsigned int local_var_index = IMMEDIATE_u1; \
3509     int ival = IMMEDIATE_s1; \
3510     expand_iinc(local_var_index, ival, oldpc); \
3511   }
3512
3513 #define SPECIAL_WIDE(IGNORED) \
3514   { \
3515     int modified_opcode = IMMEDIATE_u1; \
3516     unsigned int local_var_index = IMMEDIATE_u2; \
3517     switch (modified_opcode) \
3518       { \
3519       case OPCODE_iinc: \
3520         { \
3521           int ival = IMMEDIATE_s2; \
3522           expand_iinc (local_var_index, ival, oldpc); \
3523           break; \
3524         } \
3525       case OPCODE_iload: \
3526       case OPCODE_lload: \
3527       case OPCODE_fload: \
3528       case OPCODE_dload: \
3529       case OPCODE_aload: \
3530         { \
3531           /* duplicate code from LOAD macro */ \
3532           LOAD_INTERNAL(operand_type[modified_opcode], local_var_index); \
3533           break; \
3534         } \
3535       case OPCODE_istore: \
3536       case OPCODE_lstore: \
3537       case OPCODE_fstore: \
3538       case OPCODE_dstore: \
3539       case OPCODE_astore: \
3540         { \
3541           STORE_INTERNAL(operand_type[modified_opcode], local_var_index); \
3542           break; \
3543         } \
3544       default: \
3545         error ("unrecogized wide sub-instruction"); \
3546       } \
3547   }
3548
3549 #define SPECIAL_THROW(IGNORED) \
3550   build_java_athrow (pop_value (throwable_type_node))
3551
3552 #define SPECIAL_BREAK NOT_IMPL1
3553 #define IMPL          NOT_IMPL
3554
3555 #include "javaop.def"
3556 #undef JAVAOP
3557    default:
3558     fprintf (stderr, "%3d: unknown(%3d)\n", oldpc, byte_ops[PC]);
3559   }
3560   return PC;
3561 }
3562
3563 /* Return the opcode at PC in the code section pointed to by
3564    CODE_OFFSET.  */
3565
3566 static unsigned char
3567 peek_opcode_at_pc (JCF *jcf, int code_offset, int pc)
3568 {
3569   unsigned char opcode;
3570   long absolute_offset = (long)JCF_TELL (jcf);
3571
3572   JCF_SEEK (jcf, code_offset);
3573   opcode = jcf->read_ptr [pc];
3574   JCF_SEEK (jcf, absolute_offset);
3575   return opcode;
3576 }
3577
3578 /* Some bytecode compilers are emitting accurate LocalVariableTable
3579    attributes. Here's an example:
3580
3581      PC   <t>store_<n>
3582      PC+1 ...
3583
3584      Attribute "LocalVariableTable"
3585      slot #<n>: ... (PC: PC+1 length: L)
3586
3587    This is accurate because the local in slot <n> really exists after
3588    the opcode at PC is executed, hence from PC+1 to PC+1+L.
3589
3590    This procedure recognizes this situation and extends the live range
3591    of the local in SLOT to START_PC-1 or START_PC-2 (depending on the
3592    length of the store instruction.)
3593
3594    This function is used by `give_name_to_locals' so that a local's
3595    DECL features a DECL_LOCAL_START_PC such that the first related
3596    store operation will use DECL as a destination, not an unrelated
3597    temporary created for the occasion.
3598
3599    This function uses a global (instruction_bits) `note_instructions' should
3600    have allocated and filled properly.  */
3601
3602 int
3603 maybe_adjust_start_pc (struct JCF *jcf, int code_offset,
3604                        int start_pc, int slot)
3605 {
3606   int first, index, opcode;
3607   int pc, insn_pc;
3608   int wide_found = 0;
3609
3610   if (!start_pc)
3611     return start_pc;
3612
3613   first = index = -1;
3614
3615   /* Find last previous instruction and remember it */
3616   for (pc = start_pc-1; pc; pc--)
3617     if (instruction_bits [pc] & BCODE_INSTRUCTION_START)
3618       break;
3619   insn_pc = pc;
3620
3621   /* Retrieve the instruction, handle `wide'. */
3622   opcode = (int) peek_opcode_at_pc (jcf, code_offset, pc++);
3623   if (opcode == OPCODE_wide)
3624     {
3625       wide_found = 1;
3626       opcode = (int) peek_opcode_at_pc (jcf, code_offset, pc++);
3627     }
3628
3629   switch (opcode)
3630     {
3631     case OPCODE_astore_0:
3632     case OPCODE_astore_1:
3633     case OPCODE_astore_2:
3634     case OPCODE_astore_3:
3635       first = OPCODE_astore_0;
3636       break;
3637
3638     case OPCODE_istore_0:
3639     case OPCODE_istore_1:
3640     case OPCODE_istore_2:
3641     case OPCODE_istore_3:
3642       first = OPCODE_istore_0;
3643       break;
3644
3645     case OPCODE_lstore_0:
3646     case OPCODE_lstore_1:
3647     case OPCODE_lstore_2:
3648     case OPCODE_lstore_3:
3649       first = OPCODE_lstore_0;
3650       break;
3651
3652     case OPCODE_fstore_0:
3653     case OPCODE_fstore_1:
3654     case OPCODE_fstore_2:
3655     case OPCODE_fstore_3:
3656       first = OPCODE_fstore_0;
3657       break;
3658
3659     case OPCODE_dstore_0:
3660     case OPCODE_dstore_1:
3661     case OPCODE_dstore_2:
3662     case OPCODE_dstore_3:
3663       first = OPCODE_dstore_0;
3664       break;
3665
3666     case OPCODE_astore:
3667     case OPCODE_istore:
3668     case OPCODE_lstore:
3669     case OPCODE_fstore:
3670     case OPCODE_dstore:
3671       index = peek_opcode_at_pc (jcf, code_offset, pc);
3672       if (wide_found)
3673         {
3674           int other = peek_opcode_at_pc (jcf, code_offset, ++pc);
3675           index = (other << 8) + index;
3676         }
3677       break;
3678     }
3679
3680   /* Now we decide: first >0 means we have a <t>store_<n>, index >0
3681      means we have a <t>store. */
3682   if ((first > 0 && opcode - first == slot) || (index > 0 && index == slot))
3683     start_pc = insn_pc;
3684
3685   return start_pc;
3686 }
3687
3688 /* Force the (direct) sub-operands of NODE to be evaluated in left-to-right
3689    order, as specified by Java Language Specification.
3690
3691    The problem is that while expand_expr will evaluate its sub-operands in
3692    left-to-right order, for variables it will just return an rtx (i.e.
3693    an lvalue) for the variable (rather than an rvalue).  So it is possible
3694    that a later sub-operand will change the register, and when the
3695    actual operation is done, it will use the new value, when it should
3696    have used the original value.
3697
3698    We fix this by using save_expr.  This forces the sub-operand to be
3699    copied into a fresh virtual register,
3700
3701    For method invocation, we modify the arguments so that a
3702    left-to-right order evaluation is performed. Saved expressions
3703    will, in CALL_EXPR order, be reused when the call will be expanded.
3704
3705    We also promote outgoing args if needed.  */
3706
3707 tree
3708 force_evaluation_order (tree node)
3709 {
3710   if (flag_syntax_only)
3711     return node;
3712   if (TREE_CODE (node) == CALL_EXPR
3713       || (TREE_CODE (node) == COMPOUND_EXPR
3714           && TREE_CODE (TREE_OPERAND (node, 0)) == CALL_EXPR
3715           && TREE_CODE (TREE_OPERAND (node, 1)) == SAVE_EXPR))
3716     {
3717       tree call, cmp;
3718       int i, nargs;
3719
3720       /* Account for wrapped around ctors.  */
3721       if (TREE_CODE (node) == COMPOUND_EXPR)
3722         call = TREE_OPERAND (node, 0);
3723       else
3724         call = node;
3725
3726       nargs = call_expr_nargs (call);
3727
3728       /* This reverses the evaluation order. This is a desired effect. */
3729       for (i = 0, cmp = NULL_TREE; i < nargs; i++)
3730         {
3731           tree arg = CALL_EXPR_ARG (call, i);
3732           /* Promote types smaller than integer.  This is required by
3733              some ABIs.  */
3734           tree type = TREE_TYPE (arg);
3735           tree saved;
3736           if (targetm.calls.promote_prototypes (type)
3737               && INTEGRAL_TYPE_P (type)
3738               && INT_CST_LT_UNSIGNED (TYPE_SIZE (type),
3739                                       TYPE_SIZE (integer_type_node)))
3740             arg = fold_convert (integer_type_node, arg);
3741
3742           saved = save_expr (force_evaluation_order (arg));
3743           cmp = (cmp == NULL_TREE ? saved :
3744                  build2 (COMPOUND_EXPR, void_type_node, cmp, saved));
3745
3746           CALL_EXPR_ARG (call, i) = saved;
3747         }
3748
3749       if (cmp && TREE_CODE (cmp) == COMPOUND_EXPR)
3750         TREE_SIDE_EFFECTS (cmp) = 1;
3751
3752       if (cmp)
3753         {
3754           cmp = build2 (COMPOUND_EXPR, TREE_TYPE (node), cmp, node);
3755           if (TREE_TYPE (cmp) != void_type_node)
3756             cmp = save_expr (cmp);
3757           TREE_SIDE_EFFECTS (cmp) = 1;
3758           node = cmp;
3759         }
3760     }
3761   return node;
3762 }
3763
3764 /* Build a node to represent empty statements and blocks. */
3765
3766 tree
3767 build_java_empty_stmt (void)
3768 {
3769   tree t = build_empty_stmt (input_location);
3770   return t;
3771 }
3772
3773 /* Promote all args of integral type before generating any code.  */
3774
3775 static void
3776 promote_arguments (void)
3777 {
3778   int i;
3779   tree arg;
3780   for (arg = DECL_ARGUMENTS (current_function_decl), i = 0;
3781        arg != NULL_TREE;  arg = DECL_CHAIN (arg), i++)
3782     {
3783       tree arg_type = TREE_TYPE (arg);
3784       if (INTEGRAL_TYPE_P (arg_type)
3785           && TYPE_PRECISION (arg_type) < 32)
3786         {
3787           tree copy = find_local_variable (i, integer_type_node, -1);
3788           java_add_stmt (build2 (MODIFY_EXPR, integer_type_node,
3789                                  copy,
3790                                  fold_convert (integer_type_node, arg)));
3791         }
3792       if (TYPE_IS_WIDE (arg_type))
3793         i++;
3794     }
3795 }
3796
3797 /* Create a local variable that points to the constant pool.  */
3798
3799 static void
3800 cache_cpool_data_ref (void)
3801 {
3802   if (optimize)
3803     {
3804       tree cpool;
3805       tree d = build_constant_data_ref (flag_indirect_classes);
3806       tree cpool_ptr = build_decl (input_location, VAR_DECL, NULL_TREE,
3807                                    build_pointer_type (TREE_TYPE (d)));
3808       java_add_local_var (cpool_ptr);
3809       TREE_CONSTANT (cpool_ptr) = 1;
3810
3811       java_add_stmt (build2 (MODIFY_EXPR, TREE_TYPE (cpool_ptr),
3812                              cpool_ptr, build_address_of (d)));
3813       cpool = build1 (INDIRECT_REF, TREE_TYPE (d), cpool_ptr);
3814       TREE_THIS_NOTRAP (cpool) = 1;
3815       TYPE_CPOOL_DATA_REF (output_class) = cpool;
3816     }
3817 }
3818
3819 #include "gt-java-expr.h"