gcc/ada/gcc-interface/ada-tree.h

   1 /****************************************************************************
   2  *                                                                          *
   3  *                         GNAT COMPILER COMPONENTS                         *
   4  *                                                                          *
   5  *                             A D A - T R E E                              *
   6  *                                                                          *
   7  *                              C Header File                               *
   8  *                                                                          *
   9  *          Copyright (C) 1992-2013, Free Software Foundation, Inc.         *
  10  *                                                                          *
  11  * GNAT is free software;  you can  redistribute it  and/or modify it under *
  12  * terms of the  GNU General Public License as published  by the Free Soft- *
  13  * ware  Foundation;  either version 3,  or (at your option) any later ver- *
  14  * sion.  GNAT is distributed in the hope that it will be useful, but WITH- *
  15  * OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY *
  16  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License *
  17  * for  more details.  You should have received a copy of the GNU General   *
  18  * Public License along with GCC; see the file COPYING3.  If not see        *
  19  * <http://www.gnu.org/licenses/>.                                          *
  20  *                                                                          *
  21  * GNAT was originally developed  by the GNAT team at  New York University. *
  22  * Extensive contributions were provided by Ada Core Technologies Inc.      *
  23  *                                                                          *
  24  ****************************************************************************/
  25
  26 /* The resulting tree type.  */
  27 union GTY((desc ("0"),
  28            chain_next ("CODE_CONTAINS_STRUCT (TREE_CODE (&%h.generic), TS_COMMON) ? ((union lang_tree_node *) TREE_CHAIN (&%h.generic)) : NULL")))
  29   lang_tree_node
  30 {
  31   union tree_node GTY((tag ("0"),
  32                        desc ("tree_node_structure (&%h)"))) generic;
  33 };
  34
  35 /* Ada uses the lang_decl and lang_type fields to hold a tree.
  36
  37    FIXME: the variable_size annotation here is needed because these types are
  38    variable-sized in some other front-ends.  Due to gengtype deficiency, the
  39    GTY options of such types have to agree across all front-ends.  */
  40 struct GTY((variable_size)) lang_type { tree t; };
  41 struct GTY((variable_size)) lang_decl { tree t; };
  42
  43 /* Macros to get and set the tree in TYPE_LANG_SPECIFIC.  */
  44 #define GET_TYPE_LANG_SPECIFIC(NODE) \
  45   (TYPE_LANG_SPECIFIC (NODE) ? TYPE_LANG_SPECIFIC (NODE)->t : NULL_TREE)
  46
  47 #define SET_TYPE_LANG_SPECIFIC(NODE, X)                  \
  48 do {                                                     \
  49   tree tmp = (X);                                        \
  50   if (!TYPE_LANG_SPECIFIC (NODE))                        \
  51     TYPE_LANG_SPECIFIC (NODE)                            \
  52       = ggc_alloc_lang_type (sizeof (struct lang_type)); \
  53   TYPE_LANG_SPECIFIC (NODE)->t = tmp;                    \
  54 } while (0)
  55
  56 /* Macros to get and set the tree in DECL_LANG_SPECIFIC.  */
  57 #define GET_DECL_LANG_SPECIFIC(NODE) \
  58   (DECL_LANG_SPECIFIC (NODE) ? DECL_LANG_SPECIFIC (NODE)->t : NULL_TREE)
  59
  60 #define SET_DECL_LANG_SPECIFIC(NODE, X)                  \
  61 do {                                                     \
  62   tree tmp = (X);                                        \
  63   if (!DECL_LANG_SPECIFIC (NODE))                        \
  64     DECL_LANG_SPECIFIC (NODE)                            \
  65       = ggc_alloc_lang_decl (sizeof (struct lang_decl)); \
  66   DECL_LANG_SPECIFIC (NODE)->t = tmp;                    \
  67 } while (0)
  68
  69
  70 /* Flags added to type nodes.  */
  71
  72 /* For RECORD_TYPE, UNION_TYPE, and QUAL_UNION_TYPE, nonzero if this is a
  73    record being used as a fat pointer (only true for RECORD_TYPE).  */
  74 #define TYPE_FAT_POINTER_P(NODE) \
  75   TYPE_LANG_FLAG_0 (RECORD_OR_UNION_CHECK (NODE))
  76
  77 #define TYPE_IS_FAT_POINTER_P(NODE) \
  78   (TREE_CODE (NODE) == RECORD_TYPE && TYPE_FAT_POINTER_P (NODE))
  79
  80 /* For integral types and array types, nonzero if this is a packed array type
  81    used for bit-packed types.  Such types should not be extended to a larger
  82    size or validated against a specified size.  */
  83 #define TYPE_PACKED_ARRAY_TYPE_P(NODE) \
  84   TYPE_LANG_FLAG_0 (TREE_CHECK2 (NODE, INTEGER_TYPE, ARRAY_TYPE))
  85
  86 #define TYPE_IS_PACKED_ARRAY_TYPE_P(NODE) \
  87   ((TREE_CODE (NODE) == INTEGER_TYPE || TREE_CODE (NODE) == ARRAY_TYPE) \
  88    && TYPE_PACKED_ARRAY_TYPE_P (NODE))
  89
  90 /* For INTEGER_TYPE, nonzero if this is a modular type with a modulus that
  91    is not equal to two to the power of its mode's size.  */
  92 #define TYPE_MODULAR_P(NODE) TYPE_LANG_FLAG_1 (INTEGER_TYPE_CHECK (NODE))
  93
  94 /* For ARRAY_TYPE, nonzero if this type corresponds to a dimension of
  95    an Ada array other than the first.  */
  96 #define TYPE_MULTI_ARRAY_P(NODE) TYPE_LANG_FLAG_1 (ARRAY_TYPE_CHECK (NODE))
  97
  98 /* For FUNCTION_TYPE, nonzero if this denotes a function returning an
  99    unconstrained array or record.  */
 100 #define TYPE_RETURN_UNCONSTRAINED_P(NODE) \
 101   TYPE_LANG_FLAG_1 (FUNCTION_TYPE_CHECK (NODE))
 102
 103 /* For RECORD_TYPE, UNION_TYPE, and QUAL_UNION_TYPE, nonzero if this denotes
 104    a justified modular type (will only be true for RECORD_TYPE).  */
 105 #define TYPE_JUSTIFIED_MODULAR_P(NODE) \
 106   TYPE_LANG_FLAG_1 (RECORD_OR_UNION_CHECK (NODE))
 107
 108 /* Nonzero in an arithmetic subtype if this is a subtype not known to the
 109    front-end.  */
 110 #define TYPE_EXTRA_SUBTYPE_P(NODE) TYPE_LANG_FLAG_2 (INTEGER_TYPE_CHECK (NODE))
 111
 112 /* Nonzero for an aggregate type if this is a by-reference type.  We also
 113    set this on an ENUMERAL_TYPE that is dummy.  */
 114 #define TYPE_BY_REFERENCE_P(NODE)                                      \
 115   TYPE_LANG_FLAG_2 (TREE_CHECK5 (NODE, RECORD_TYPE, UNION_TYPE,        \
 116                                  ARRAY_TYPE, UNCONSTRAINED_ARRAY_TYPE, \
 117                                  ENUMERAL_TYPE))
 118
 119 #define TYPE_IS_BY_REFERENCE_P(NODE)                \
 120   ((TREE_CODE (NODE) == RECORD_TYPE                 \
 121     || TREE_CODE (NODE) == UNION_TYPE               \
 122     || TREE_CODE (NODE) == ARRAY_TYPE               \
 123     || TREE_CODE (NODE) == UNCONSTRAINED_ARRAY_TYPE \
 124     || TREE_CODE (NODE) == ENUMERAL_TYPE)           \
 125    && TYPE_BY_REFERENCE_P (NODE))
 126
 127 /* For INTEGER_TYPE, nonzero if this really represents a VAX
 128    floating-point type.  */
 129 #define TYPE_VAX_FLOATING_POINT_P(NODE) \
 130   TYPE_LANG_FLAG_3 (INTEGER_TYPE_CHECK (NODE))
 131
 132 /* For RECORD_TYPE, UNION_TYPE, and QUAL_UNION_TYPE, nonzero if this is the
 133    type for an object whose type includes its template in addition to
 134    its value (only true for RECORD_TYPE).  */
 135 #define TYPE_CONTAINS_TEMPLATE_P(NODE) \
 136   TYPE_LANG_FLAG_3 (RECORD_OR_UNION_CHECK (NODE))
 137
 138 /* True if NODE is a thin pointer.  */
 139 #define TYPE_IS_THIN_POINTER_P(NODE)                    \
 140   (POINTER_TYPE_P (NODE)                                \
 141    && TREE_CODE (TREE_TYPE (NODE)) == RECORD_TYPE       \
 142    && TYPE_CONTAINS_TEMPLATE_P (TREE_TYPE (NODE)))
 143
 144 /* True if TYPE is either a fat or thin pointer to an unconstrained
 145    array.  */
 146 #define TYPE_IS_FAT_OR_THIN_POINTER_P(NODE) \
 147   (TYPE_IS_FAT_POINTER_P (NODE) || TYPE_IS_THIN_POINTER_P (NODE))
 148
 149 /* For INTEGER_TYPEs, nonzero if the type has a biased representation.  */
 150 #define TYPE_BIASED_REPRESENTATION_P(NODE) \
 151   TYPE_LANG_FLAG_4 (INTEGER_TYPE_CHECK (NODE))
 152
 153 /* For ARRAY_TYPEs, nonzero if the array type has Convention_Fortran.  */
 154 #define TYPE_CONVENTION_FORTRAN_P(NODE) \
 155   TYPE_LANG_FLAG_4 (ARRAY_TYPE_CHECK (NODE))
 156
 157 /* For FUNCTION_TYPEs, nonzero if the function returns by direct reference,
 158    i.e. the callee returns a pointer to a memory location it has allocated
 159    and the caller only needs to dereference the pointer.  */
 160 #define TYPE_RETURN_BY_DIRECT_REF_P(NODE) \
 161   TYPE_LANG_FLAG_4 (FUNCTION_TYPE_CHECK (NODE))
 162
 163 /* For RECORD_TYPE, UNION_TYPE and ENUMERAL_TYPE, nonzero if this is a dummy
 164    type, made to correspond to a private or incomplete type.  */
 165 #define TYPE_DUMMY_P(NODE) \
 166   TYPE_LANG_FLAG_4 (TREE_CHECK3 (NODE, RECORD_TYPE, UNION_TYPE, ENUMERAL_TYPE))
 167
 168 #define TYPE_IS_DUMMY_P(NODE)             \
 169   ((TREE_CODE (NODE) == RECORD_TYPE       \
 170     || TREE_CODE (NODE) == UNION_TYPE     \
 171     || TREE_CODE (NODE) == ENUMERAL_TYPE) \
 172    && TYPE_DUMMY_P (NODE))
 173
 174 /* For an INTEGER_TYPE, nonzero if TYPE_ACTUAL_BOUNDS is present.  */
 175 #define TYPE_HAS_ACTUAL_BOUNDS_P(NODE) \
 176   TYPE_LANG_FLAG_5 (INTEGER_TYPE_CHECK (NODE))
 177
 178 /* For a RECORD_TYPE, nonzero if this was made just to supply needed
 179    padding or alignment.  */
 180 #define TYPE_PADDING_P(NODE) TYPE_LANG_FLAG_5 (RECORD_TYPE_CHECK (NODE))
 181
 182 #define TYPE_IS_PADDING_P(NODE) \
 183   (TREE_CODE (NODE) == RECORD_TYPE && TYPE_PADDING_P (NODE))
 184
 185 /* True if TYPE can alias any other types.  */
 186 #define TYPE_UNIVERSAL_ALIASING_P(NODE) TYPE_LANG_FLAG_6 (NODE)
 187
 188 /* For an UNCONSTRAINED_ARRAY_TYPE, this is the record containing both the
 189    template and the object.
 190
 191    ??? We also put this on an ENUMERAL_TYPE that is dummy.  Technically,
 192    this is a conflict on the minval field, but there doesn't seem to be
 193    simple fix, so we'll live with this kludge for now.  */
 194 #define TYPE_OBJECT_RECORD_TYPE(NODE) \
 195   (TYPE_MINVAL (TREE_CHECK2 ((NODE), UNCONSTRAINED_ARRAY_TYPE, ENUMERAL_TYPE)))
 196
 197 /* For numerical types, this is the GCC lower bound of the type.  The GCC
 198    type system is based on the invariant that an object X of a given type
 199    cannot hold at run time a value smaller than its lower bound; otherwise
 200    the behavior is undefined.  The optimizer takes advantage of this and
 201    considers that the assertion X >= LB is always true.  */
 202 #define TYPE_GCC_MIN_VALUE(NODE) (TYPE_MINVAL (NUMERICAL_TYPE_CHECK (NODE)))
 203
 204 /* For numerical types, this is the GCC upper bound of the type.  The GCC
 205    type system is based on the invariant that an object X of a given type
 206    cannot hold at run time a value larger than its upper bound; otherwise
 207    the behavior is undefined.  The optimizer takes advantage of this and
 208    considers that the assertion X <= UB is always true.  */
 209 #define TYPE_GCC_MAX_VALUE(NODE) (TYPE_MAXVAL (NUMERICAL_TYPE_CHECK (NODE)))
 210
 211 /* For a FUNCTION_TYPE, if the subprogram has parameters passed by copy in/
 212    copy out, this is the list of nodes used to specify the return values of
 213    the out (or in out) parameters that are passed by copy in/copy out.  For
 214    a full description of the copy in/copy out parameter passing mechanism
 215    refer to the routine gnat_to_gnu_entity.  */
 216 #define TYPE_CI_CO_LIST(NODE) TYPE_LANG_SLOT_1 (FUNCTION_TYPE_CHECK (NODE))
 217
 218 /* For a VECTOR_TYPE, this is the representative array type.  */
 219 #define TYPE_REPRESENTATIVE_ARRAY(NODE) \
 220   TYPE_LANG_SLOT_1 (VECTOR_TYPE_CHECK (NODE))
 221
 222 /* For numerical types, this holds various RM-defined values.  */
 223 #define TYPE_RM_VALUES(NODE) TYPE_LANG_SLOT_1 (NUMERICAL_TYPE_CHECK (NODE))
 224
 225 /* Macros to get and set the individual values in TYPE_RM_VALUES.  */
 226 #define TYPE_RM_VALUE(NODE, N)                              \
 227   (TYPE_RM_VALUES (NODE)                                    \
 228    ? TREE_VEC_ELT (TYPE_RM_VALUES (NODE), (N)) : NULL_TREE)
 229
 230 #define SET_TYPE_RM_VALUE(NODE, N, X)              \
 231 do {                                               \
 232   tree tmp = (X);                                  \
 233   if (!TYPE_RM_VALUES (NODE))                      \
 234     TYPE_RM_VALUES (NODE) = make_tree_vec (3);     \
 235   /* ??? The field is not visited by the generic   \
 236      code so we need to mark it manually.  */      \
 237   MARK_VISITED (tmp);                              \
 238   TREE_VEC_ELT (TYPE_RM_VALUES (NODE), (N)) = tmp; \
 239 } while (0)
 240
 241 /* For numerical types, this is the RM size of the type, aka its precision.
 242    There is a discrepancy between what is called precision here (and more
 243    generally throughout gigi) and what is called precision in the GCC type
 244    system: in the former case it's TYPE_RM_SIZE whereas it's TYPE_PRECISION
 245    in the latter case.  They are not identical because of the need to support
 246    invalid values.
 247
 248    These values can be outside the range of values allowed by the RM size
 249    but they must nevertheless be valid in the GCC type system, otherwise
 250    the optimizer can pretend that they simply don't exist.  Therefore they
 251    must be within the range of values allowed by the precision in the GCC
 252    sense, hence TYPE_PRECISION be set to the Esize, not the RM size.  */
 253 #define TYPE_RM_SIZE(NODE) TYPE_RM_VALUE ((NODE), 0)
 254 #define SET_TYPE_RM_SIZE(NODE, X) SET_TYPE_RM_VALUE ((NODE), 0, (X))
 255
 256 /* For numerical types, this is the RM lower bound of the type.  There is
 257    again a discrepancy between this lower bound and the GCC lower bound,
 258    again because of the need to support invalid values.
 259
 260    These values can be outside the range of values allowed by the RM lower
 261    bound but they must nevertheless be valid in the GCC type system, otherwise
 262    the optimizer can pretend that they simply don't exist.  Therefore they
 263    must be within the range of values allowed by the lower bound in the GCC
 264    sense, hence the GCC lower bound be set to that of the base type.  */
 265 #define TYPE_RM_MIN_VALUE(NODE) TYPE_RM_VALUE ((NODE), 1)
 266 #define SET_TYPE_RM_MIN_VALUE(NODE, X) SET_TYPE_RM_VALUE ((NODE), 1, (X))
 267
 268 /* For numerical types, this is the RM upper bound of the type.  There is
 269    again a discrepancy between this upper bound and the GCC upper bound,
 270    again because of the need to support invalid values.
 271
 272    These values can be outside the range of values allowed by the RM upper
 273    bound but they must nevertheless be valid in the GCC type system, otherwise
 274    the optimizer can pretend that they simply don't exist.  Therefore they
 275    must be within the range of values allowed by the upper bound in the GCC
 276    sense, hence the GCC upper bound be set to that of the base type.  */
 277 #define TYPE_RM_MAX_VALUE(NODE) TYPE_RM_VALUE ((NODE), 2)
 278 #define SET_TYPE_RM_MAX_VALUE(NODE, X) SET_TYPE_RM_VALUE ((NODE), 2, (X))
 279
 280 /* For numerical types, this is the lower bound of the type, i.e. the RM lower
 281    bound for language-defined types and the GCC lower bound for others.  */
 282 #undef TYPE_MIN_VALUE
 283 #define TYPE_MIN_VALUE(NODE) \
 284   (TYPE_RM_MIN_VALUE (NODE) \
 285    ? TYPE_RM_MIN_VALUE (NODE) : TYPE_GCC_MIN_VALUE (NODE))
 286
 287 /* For numerical types, this is the upper bound of the type, i.e. the RM upper
 288    bound for language-defined types and the GCC upper bound for others.  */
 289 #undef TYPE_MAX_VALUE
 290 #define TYPE_MAX_VALUE(NODE) \
 291   (TYPE_RM_MAX_VALUE (NODE) \
 292    ? TYPE_RM_MAX_VALUE (NODE) : TYPE_GCC_MAX_VALUE (NODE))
 293
 294 /* For an INTEGER_TYPE with TYPE_MODULAR_P, this is the value of the
 295    modulus. */
 296 #define TYPE_MODULUS(NODE) \
 297   GET_TYPE_LANG_SPECIFIC (INTEGER_TYPE_CHECK (NODE))
 298 #define SET_TYPE_MODULUS(NODE, X) \
 299   SET_TYPE_LANG_SPECIFIC (INTEGER_TYPE_CHECK (NODE), X)
 300
 301 /* For an INTEGER_TYPE with TYPE_VAX_FLOATING_POINT_P, this is the
 302    Digits_Value.  */
 303 #define TYPE_DIGITS_VALUE(NODE) \
 304   GET_TYPE_LANG_SPECIFIC (INTEGER_TYPE_CHECK (NODE))
 305 #define SET_TYPE_DIGITS_VALUE(NODE, X) \
 306   SET_TYPE_LANG_SPECIFIC (INTEGER_TYPE_CHECK (NODE), X)
 307
 308 /* For an INTEGER_TYPE that is the TYPE_DOMAIN of some ARRAY_TYPE, this is
 309    the type corresponding to the Ada index type.  */
 310 #define TYPE_INDEX_TYPE(NODE) \
 311   GET_TYPE_LANG_SPECIFIC (INTEGER_TYPE_CHECK (NODE))
 312 #define SET_TYPE_INDEX_TYPE(NODE, X) \
 313   SET_TYPE_LANG_SPECIFIC (INTEGER_TYPE_CHECK (NODE), X)
 314
 315 /* For an INTEGER_TYPE with TYPE_HAS_ACTUAL_BOUNDS_P or an ARRAY_TYPE, this is
 316    the index type that should be used when the actual bounds are required for
 317    a template.  This is used in the case of packed arrays.  */
 318 #define TYPE_ACTUAL_BOUNDS(NODE) \
 319   GET_TYPE_LANG_SPECIFIC (TREE_CHECK2 (NODE, INTEGER_TYPE, ARRAY_TYPE))
 320 #define SET_TYPE_ACTUAL_BOUNDS(NODE, X) \
 321   SET_TYPE_LANG_SPECIFIC (TREE_CHECK2 (NODE, INTEGER_TYPE, ARRAY_TYPE), X)
 322
 323 /* For a POINTER_TYPE that points to the template type of an unconstrained
 324    array type, this is the address to be used in a null fat pointer.  */
 325 #define TYPE_NULL_BOUNDS(NODE) \
 326   GET_TYPE_LANG_SPECIFIC (POINTER_TYPE_CHECK (NODE))
 327 #define SET_TYPE_NULL_BOUNDS(NODE, X) \
 328   SET_TYPE_LANG_SPECIFIC (POINTER_TYPE_CHECK (NODE), X)
 329
 330 /* For a RECORD_TYPE that is a fat pointer, this is the type for the
 331    unconstrained array.  Likewise for a RECORD_TYPE that is pointed
 332    to by a thin pointer, if it is made for the unconstrained array
 333    type itself; the field is NULL_TREE if the RECORD_TYPE is made
 334    for a constrained subtype of the array type.  */
 335 #define TYPE_UNCONSTRAINED_ARRAY(NODE) \
 336   GET_TYPE_LANG_SPECIFIC (RECORD_TYPE_CHECK (NODE))
 337 #define SET_TYPE_UNCONSTRAINED_ARRAY(NODE, X) \
 338   SET_TYPE_LANG_SPECIFIC (RECORD_TYPE_CHECK (NODE), X)
 339
 340 /* For other RECORD_TYPEs and all UNION_TYPEs and QUAL_UNION_TYPEs, this is
 341    the Ada size of the object.  This differs from the GCC size in that it
 342    does not include any rounding up to the alignment of the type.  */
 343 #define TYPE_ADA_SIZE(NODE) \
 344   GET_TYPE_LANG_SPECIFIC (RECORD_OR_UNION_CHECK (NODE))
 345 #define SET_TYPE_ADA_SIZE(NODE, X) \
 346   SET_TYPE_LANG_SPECIFIC (RECORD_OR_UNION_CHECK (NODE), X)
 347
 348
 349 /* Flags added to decl nodes.  */
 350
 351 /* Nonzero in a FUNCTION_DECL that represents a stubbed function
 352    discriminant.  */
 353 #define DECL_STUBBED_P(NODE) DECL_LANG_FLAG_0 (FUNCTION_DECL_CHECK (NODE))
 354
 355 /* Nonzero in a VAR_DECL if it is guaranteed to be constant after having
 356    been elaborated and TREE_READONLY is not set on it.  */
 357 #define DECL_READONLY_ONCE_ELAB(NODE) DECL_LANG_FLAG_0 (VAR_DECL_CHECK (NODE))
 358
 359 /* Nonzero in a CONST_DECL if its value is (essentially) the address of a
 360    constant CONSTRUCTOR.  */
 361 #define DECL_CONST_ADDRESS_P(NODE) DECL_LANG_FLAG_0 (CONST_DECL_CHECK (NODE))
 362
 363 /* Nonzero in a FIELD_DECL if it is declared as aliased.  */
 364 #define DECL_ALIASED_P(NODE) DECL_LANG_FLAG_0 (FIELD_DECL_CHECK (NODE))
 365
 366 /* Nonzero in a TYPE_DECL if this is the declaration of a Taft amendment type
 367    in the main unit, i.e. the full declaration is available.  */
 368 #define DECL_TAFT_TYPE_P(NODE) DECL_LANG_FLAG_0 (TYPE_DECL_CHECK (NODE))
 369
 370 /* Nonzero in a DECL if it is always used by reference, i.e. an INDIRECT_REF
 371    is needed to access the object.  */
 372 #define DECL_BY_REF_P(NODE) DECL_LANG_FLAG_1 (NODE)
 373
 374 /* Nonzero in a DECL if it is made for a pointer that can never be null.  */
 375 #define DECL_CAN_NEVER_BE_NULL_P(NODE) DECL_LANG_FLAG_2 (NODE)
 376
 377 /* Nonzero in a VAR_DECL if it is made for a loop parameter.  */
 378 #define DECL_LOOP_PARM_P(NODE) DECL_LANG_FLAG_3 (VAR_DECL_CHECK (NODE))
 379
 380 /* Nonzero in a FIELD_DECL that is a dummy built for some internal reason.  */
 381 #define DECL_INTERNAL_P(NODE) DECL_LANG_FLAG_3 (FIELD_DECL_CHECK (NODE))
 382
 383 /* Nonzero in a PARM_DECL if it is made for an Ada array being passed to a
 384    foreign convention subprogram.  */
 385 #define DECL_BY_COMPONENT_PTR_P(NODE) DECL_LANG_FLAG_3 (PARM_DECL_CHECK (NODE))
 386
 387 /* Nonzero in a FUNCTION_DECL that corresponds to an elaboration procedure.  */
 388 #define DECL_ELABORATION_PROC_P(NODE) \
 389   DECL_LANG_FLAG_3 (FUNCTION_DECL_CHECK (NODE))
 390
 391 /* Nonzero in a DECL if it is made for a pointer that points to something which
 392    is readonly.  */
 393 #define DECL_POINTS_TO_READONLY_P(NODE) DECL_LANG_FLAG_4 (NODE)
 394
 395 /* Nonzero in a PARM_DECL if we are to pass by descriptor.  */
 396 #define DECL_BY_DESCRIPTOR_P(NODE) DECL_LANG_FLAG_5 (PARM_DECL_CHECK (NODE))
 397
 398 /* Nonzero in a VAR_DECL if it is a pointer renaming a global object.  */
 399 #define DECL_RENAMING_GLOBAL_P(NODE) DECL_LANG_FLAG_5 (VAR_DECL_CHECK (NODE))
 400
 401 /* In a FIELD_DECL corresponding to a discriminant, contains the
 402    discriminant number.  */
 403 #define DECL_DISCRIMINANT_NUMBER(NODE) DECL_INITIAL (FIELD_DECL_CHECK (NODE))
 404
 405 /* In a CONST_DECL, points to a VAR_DECL that is allocatable to
 406    memory.  Used when a scalar constant is aliased or has its
 407    address taken.  */
 408 #define DECL_CONST_CORRESPONDING_VAR(NODE) \
 409   GET_DECL_LANG_SPECIFIC (CONST_DECL_CHECK (NODE))
 410 #define SET_DECL_CONST_CORRESPONDING_VAR(NODE, X) \
 411   SET_DECL_LANG_SPECIFIC (CONST_DECL_CHECK (NODE), X)
 412
 413 /* In a FIELD_DECL, points to the FIELD_DECL that was the ultimate
 414    source of the decl.  */
 415 #define DECL_ORIGINAL_FIELD(NODE) \
 416   GET_DECL_LANG_SPECIFIC (FIELD_DECL_CHECK (NODE))
 417 #define SET_DECL_ORIGINAL_FIELD(NODE, X) \
 418   SET_DECL_LANG_SPECIFIC (FIELD_DECL_CHECK (NODE), X)
 419
 420 /* Set DECL_ORIGINAL_FIELD of FIELD1 to (that of) FIELD2.  */
 421 #define SET_DECL_ORIGINAL_FIELD_TO_FIELD(FIELD1, FIELD2)        \
 422   SET_DECL_ORIGINAL_FIELD ((FIELD1),                            \
 423                            DECL_ORIGINAL_FIELD (FIELD2)         \
 424                            ? DECL_ORIGINAL_FIELD (FIELD2) : (FIELD2))
 425
 426 /* Return true if FIELD1 and FIELD2 represent the same field.  */
 427 #define SAME_FIELD_P(FIELD1, FIELD2)                                    \
 428   ((FIELD1) == (FIELD2)                                                 \
 429    || DECL_ORIGINAL_FIELD (FIELD1) == (FIELD2)                          \
 430    || (FIELD1) == DECL_ORIGINAL_FIELD (FIELD2)                          \
 431    || (DECL_ORIGINAL_FIELD (FIELD1)                                     \
 432        && (DECL_ORIGINAL_FIELD (FIELD1) == DECL_ORIGINAL_FIELD (FIELD2))))
 433
 434 /* In a VAR_DECL with the DECL_LOOP_PARM_P flag set, points to the special
 435    induction variable that is built under certain circumstances, if any.  */
 436 #define DECL_INDUCTION_VAR(NODE) \
 437   GET_DECL_LANG_SPECIFIC (VAR_DECL_CHECK (NODE))
 438 #define SET_DECL_INDUCTION_VAR(NODE, X) \
 439   SET_DECL_LANG_SPECIFIC (VAR_DECL_CHECK (NODE), X)
 440
 441 /* In a VAR_DECL without the DECL_LOOP_PARM_P flag set and that is a renaming
 442    pointer, points to the object being renamed, if any.  Note that this object
 443    is guaranteed to be protected against multiple evaluations.  */
 444 #define DECL_RENAMED_OBJECT(NODE) \
 445   GET_DECL_LANG_SPECIFIC (VAR_DECL_CHECK (NODE))
 446 #define SET_DECL_RENAMED_OBJECT(NODE, X) \
 447   SET_DECL_LANG_SPECIFIC (VAR_DECL_CHECK (NODE), X)
 448
 449 /* In a TYPE_DECL, points to the parallel type if any, otherwise 0.  */
 450 #define DECL_PARALLEL_TYPE(NODE) \
 451   GET_DECL_LANG_SPECIFIC (TYPE_DECL_CHECK (NODE))
 452 #define SET_DECL_PARALLEL_TYPE(NODE, X) \
 453   SET_DECL_LANG_SPECIFIC (TYPE_DECL_CHECK (NODE), X)
 454
 455 /* In a FUNCTION_DECL, points to the stub associated with the function
 456    if any, otherwise 0.  */
 457 #define DECL_FUNCTION_STUB(NODE) \
 458   GET_DECL_LANG_SPECIFIC (FUNCTION_DECL_CHECK (NODE))
 459 #define SET_DECL_FUNCTION_STUB(NODE, X) \
 460   SET_DECL_LANG_SPECIFIC (FUNCTION_DECL_CHECK (NODE), X)
 461
 462 /* In a PARM_DECL, points to the alternate TREE_TYPE.  */
 463 #define DECL_PARM_ALT_TYPE(NODE) \
 464   GET_DECL_LANG_SPECIFIC (PARM_DECL_CHECK (NODE))
 465 #define SET_DECL_PARM_ALT_TYPE(NODE, X) \
 466   SET_DECL_LANG_SPECIFIC (PARM_DECL_CHECK (NODE), X)
 467
 468
 469 /* Flags added to ref nodes.  */
 470
 471 /* Nonzero means this node will not trap.  */
 472 #undef TREE_THIS_NOTRAP
 473 #define TREE_THIS_NOTRAP(NODE) \
 474   (TREE_CHECK4 (NODE, INDIRECT_REF, ARRAY_REF, UNCONSTRAINED_ARRAY_REF, \
 475                 ARRAY_RANGE_REF)->base.nothrow_flag)
 476
 477
 478 /* Fields and macros for statements.  */
 479 #define IS_ADA_STMT(NODE) \
 480   (STATEMENT_CLASS_P (NODE) && TREE_CODE (NODE) >= STMT_STMT)
 481
 482 #define STMT_STMT_STMT(NODE)     TREE_OPERAND_CHECK_CODE (NODE, STMT_STMT, 0)
 483
 484 #define LOOP_STMT_COND(NODE)     TREE_OPERAND_CHECK_CODE (NODE, LOOP_STMT, 0)
 485 #define LOOP_STMT_UPDATE(NODE)   TREE_OPERAND_CHECK_CODE (NODE, LOOP_STMT, 1)
 486 #define LOOP_STMT_BODY(NODE)     TREE_OPERAND_CHECK_CODE (NODE, LOOP_STMT, 2)
 487 #define LOOP_STMT_LABEL(NODE)    TREE_OPERAND_CHECK_CODE (NODE, LOOP_STMT, 3)
 488
 489 /* A loop statement is conceptually made up of 6 sub-statements:
 490
 491     loop:
 492       TOP_CONDITION
 493       TOP_UPDATE
 494       BODY
 495       BOTTOM_CONDITION
 496       BOTTOM_UPDATE
 497       GOTO loop
 498
 499   However, only 4 of them can exist for a given loop, the pair of conditions
 500   and the pair of updates being mutually exclusive.  The default setting is
 501   TOP_CONDITION and BOTTOM_UPDATE and the following couple of flags are used
 502   to toggle the individual settings.  */
 503 #define LOOP_STMT_BOTTOM_COND_P(NODE) TREE_LANG_FLAG_0 (LOOP_STMT_CHECK (NODE))
 504 #define LOOP_STMT_TOP_UPDATE_P(NODE)  TREE_LANG_FLAG_1 (LOOP_STMT_CHECK (NODE))
 505
 506 /* Optimization hints on loops.  */
 507 #define LOOP_STMT_NO_UNROLL(NODE) TREE_LANG_FLAG_2 (LOOP_STMT_CHECK (NODE))
 508 #define LOOP_STMT_UNROLL(NODE)    TREE_LANG_FLAG_3 (LOOP_STMT_CHECK (NODE))
 509 #define LOOP_STMT_NO_VECTOR(NODE) TREE_LANG_FLAG_4 (LOOP_STMT_CHECK (NODE))
 510 #define LOOP_STMT_VECTOR(NODE)    TREE_LANG_FLAG_5 (LOOP_STMT_CHECK (NODE))
 511
 512 #define EXIT_STMT_COND(NODE)     TREE_OPERAND_CHECK_CODE (NODE, EXIT_STMT, 0)
 513 #define EXIT_STMT_LABEL(NODE)    TREE_OPERAND_CHECK_CODE (NODE, EXIT_STMT, 1)