gcc/README.gnat

   1 The following patches are needed in order to build GNAT with EGCS.
   2
   3 These patches were tested with egcs-980308 and gnat-3.10p on a mips-sgi-irix6.3
   4 system.  The gnat build succeeded as per the instructions in the gnat
   5 README.BUILD file for building one library, except that CFLAGS="-O -g" and
   6 GNATLIBCFLAGS="-O -g" were substituted for the recommended "-O2" so that the
   7 build could be debugged.  There was no attempt to run the resulting build
   8 against any testsuite or validation suite.
   9
  10 --
  11
  12 Developers Notes:
  13
  14 Every use of sizetype in the Ada front end should be checked to see if perhaps
  15 it should be using bitsizetype instead.  The change to maybe_pad_type is just
  16 a hack to work around this problem, and may not be desirable in the long term.
  17
  18 There are many places in the Ada front end where it calls operand_equal_p to
  19 see if two type sizes are the same.  operand_equal_p fails if the two
  20 arguments have different TYPE_MODEs.  sizetype and bitsizetype can have
  21 different TYPE_MODEs.  Thus this code can fail if one type size is based
  22 on sizetype, and the other is based on bitsizetype.  The change to
  23 maybe_pad_type fixes one very critical place where this happens.  There may
  24 be others.
  25
  26 --
  27
  28 Mon Mar 16 11:00:25 1998  Jim Wilson  <wilson@cygnus.com>
  29
  30         * a-gtran3.c (maybe_pad_type): Convert both size and orig_size to
  31         sizetype if they have differing modes.
  32         * a-misc.c (gnat_tree_code_type): Change from string to char array.
  33         (init_lex): Delete realloc calls for tree_code_* globals.  Adjust
  34         bcopy call for gnat_tree_code_type change.
  35         * a-tree.def: Adjust for tree_code_* type changes.
  36
  37         * a-misc.c (init_lex): Rename to init_parse.
  38
  39 diff -c ada/a-gtran3.c /home/brolley/comp/egcs/tmp/ada/a-gtran3.c
  40 *** ada/a-gtran3.c      Mon Mar 30 16:29:04 1998
  41 --- /home/brolley/comp/egcs/tmp/ada/a-gtran3.c  Thu Apr  2 17:16:15 1998
  42 ***************
  43 *** 3329,3334 ****
  44 --- 3329,3341 ----
  45        isn't changing.  Likewise, clear the alignment if it isn't being
  46        changed.  Then return if we aren't doing anything.  */
  47
  48 +     if (size != 0
  49 +       && TYPE_MODE (TREE_TYPE (size)) != TYPE_MODE (TREE_TYPE (orig_size)))
  50 +       {
  51 +       size = convert (sizetype, size);
  52 +       orig_size = convert (sizetype, orig_size);
  53 +       }
  54 +
  55     if (size != 0
  56         && (operand_equal_p (size, orig_size, 0)
  57           || (TREE_CODE (orig_size) == INTEGER_CST
  58 diff -c ada/a-misc.c /home/brolley/comp/egcs/tmp/ada/a-misc.c
  59 *** ada/a-misc.c        Mon Mar 30 16:29:05 1998
  60 --- /home/brolley/comp/egcs/tmp/ada/a-misc.c    Thu Apr  2 17:36:19 1998
  61 ***************
  62 *** 70,77 ****
  63
  64   #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) TYPE,
  65
  66 ! char *gnat_tree_code_type[] = {
  67 !   "x",
  68   #include "a-tree.def"
  69   };
  70   #undef DEFTREECODE
  71 --- 70,77 ----
  72
  73   #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) TYPE,
  74
  75 ! char gnat_tree_code_type[] = {
  76 !   'x',
  77   #include "a-tree.def"
  78   };
  79   #undef DEFTREECODE
  80 ***************
  81 *** 254,259 ****
  82 --- 254,268 ----
  83   print_lang_statistics ()
  84   {}
  85
  86 + void
  87 + lang_print_xnode (file, node, indent)
  88 +      FILE *file;
  89 +      tree node;
  90 +      int indent;
  91 + {
  92 + }
  93 +
  94 +
  95   /* integrate_decl_tree calls this function, but since we don't use the
  96      DECL_LANG_SPECIFIC field, this is a no-op.  */
  97
  98 ***************
  99 *** 603,622 ****
 100      it, but it's where g++ does it.  */
 101
 102   void
 103 ! init_lex ()
 104   {
 105     lang_expand_expr = gnat_expand_expr;
 106
 107 -   tree_code_type
 108 -     = (char **) realloc (tree_code_type,
 109 -                        sizeof (char *) * LAST_GNAT_TREE_CODE);
 110 -   tree_code_length
 111 -     = (int *) realloc (tree_code_length,
 112 -                      sizeof (int) * LAST_GNAT_TREE_CODE);
 113 -   tree_code_name
 114 -     = (char **) realloc (tree_code_name,
 115 -                        sizeof (char *) * LAST_GNAT_TREE_CODE);
 116 -
 117     bcopy ((char *) gnat_tree_code_type,
 118          (char *) (tree_code_type + (int) LAST_AND_UNUSED_TREE_CODE),
 119          ((LAST_GNAT_TREE_CODE - (int) LAST_AND_UNUSED_TREE_CODE)
 120 --- 612,622 ----
 121      it, but it's where g++ does it.  */
 122
 123   void
 124 ! init_parse (filename)
 125 !      char *filename;
 126   {
 127     lang_expand_expr = gnat_expand_expr;
 128
 129     bcopy ((char *) gnat_tree_code_type,
 130          (char *) (tree_code_type + (int) LAST_AND_UNUSED_TREE_CODE),
 131          ((LAST_GNAT_TREE_CODE - (int) LAST_AND_UNUSED_TREE_CODE)
 132 ***************
 133 *** 629,636 ****
 134
 135     bcopy ((char *) gnat_tree_code_name,
 136          (char *) (tree_code_name + (int) LAST_AND_UNUSED_TREE_CODE),
 137 !        ((LAST_GNAT_TREE_CODE - (int) LAST_AND_UNUSED_TREE_CODE)
 138 !         * sizeof (char *)));
 139   }
 140
 141   /* Sets some debug flags for the parsed. It does nothing here.  */
 142 --- 629,640 ----
 143
 144     bcopy ((char *) gnat_tree_code_name,
 145          (char *) (tree_code_name + (int) LAST_AND_UNUSED_TREE_CODE),
 146 !        LAST_GNAT_TREE_CODE - (int) LAST_AND_UNUSED_TREE_CODE);
 147 ! }
 148 !
 149 ! void
 150 ! finish_parse ()
 151 ! {
 152   }
 153
 154   /* Sets some debug flags for the parsed. It does nothing here.  */
 155 diff -c ada/a-tree.def /home/brolley/comp/egcs/tmp/ada/a-tree.def
 156 *** ada/a-tree.def      Mon Mar 30 16:29:09 1998
 157 --- /home/brolley/comp/egcs/tmp/ada/a-tree.def  Thu Apr  2 17:20:38 1998
 158 ***************
 159 *** 31,69 ****
 160      The only field used if TREE_COMPLEXITY, which contains the GNAT node
 161      number.  */
 162
 163 ! DEFTREECODE (TRANSFORM_EXPR, "transform_expr", "e", 0)
 164
 165   /* Perform an unchecked conversion between the input and the output.
 166      if TREE_ADDRESSABLE is set, it means this is in an LHS; in that case,
 167      we can only use techniques, such as pointer punning, that leave the
 168      expression a "name".  */
 169
 170 ! DEFTREECODE (UNCHECKED_CONVERT_EXPR, "unchecked_convert_expr", "1", 1)
 171
 172   /* A type that is an unconstrained array itself.  This node is never passed
 173      to GCC. TREE_TYPE is the type of the fat pointer and TYPE_OBJECT_RECORD_TYPE
 174      is the type of a record containing the template and data.  */
 175
 176 ! DEFTREECODE (UNCONSTRAINED_ARRAY_TYPE, "unconstrained_array_type", "t", 0)
 177
 178   /* A reference to an unconstrained array.  This node only exists as an
 179      intermediate node during the translation of a GNAT tree to a GCC tree;
 180      it is never passed to GCC.  The only field used is operand 0, which
 181      is the fat pointer object.  */
 182
 183 ! DEFTREECODE (UNCONSTRAINED_ARRAY_REF, "unconstrained_array_ref", "r", 1)
 184
 185   /* An expression that returns an RTL suitable for its type.  Operand 0
 186      is an expression to be evaluated for side effects only.  */
 187
 188 ! DEFTREECODE (NULL_EXPR, "null_expr", "e", 1)
 189
 190   /* An expression that emits a USE for its single operand.  */
 191
 192 ! DEFTREECODE (USE_EXPR, "use_expr", "e", 1)
 193
 194   /* An expression that is treated as a conversion while generating code, but is
 195      used to prevent infinite recursion when conversions of biased types are
 196      involved.  */
 197
 198 ! DEFTREECODE (GNAT_NOP_EXPR, "gnat_nop_expr", "1", 1)
 199 --- 31,69 ----
 200      The only field used if TREE_COMPLEXITY, which contains the GNAT node
 201      number.  */
 202
 203 ! DEFTREECODE (TRANSFORM_EXPR, "transform_expr", 'e', 0)
 204
 205   /* Perform an unchecked conversion between the input and the output.
 206      if TREE_ADDRESSABLE is set, it means this is in an LHS; in that case,
 207      we can only use techniques, such as pointer punning, that leave the
 208      expression a "name".  */
 209
 210 ! DEFTREECODE (UNCHECKED_CONVERT_EXPR, "unchecked_convert_expr", '1', 1)
 211
 212   /* A type that is an unconstrained array itself.  This node is never passed
 213      to GCC. TREE_TYPE is the type of the fat pointer and TYPE_OBJECT_RECORD_TYPE
 214      is the type of a record containing the template and data.  */
 215
 216 ! DEFTREECODE (UNCONSTRAINED_ARRAY_TYPE, "unconstrained_array_type", 't', 0)
 217
 218   /* A reference to an unconstrained array.  This node only exists as an
 219      intermediate node during the translation of a GNAT tree to a GCC tree;
 220      it is never passed to GCC.  The only field used is operand 0, which
 221      is the fat pointer object.  */
 222
 223 ! DEFTREECODE (UNCONSTRAINED_ARRAY_REF, "unconstrained_array_ref", 'r', 1)
 224
 225   /* An expression that returns an RTL suitable for its type.  Operand 0
 226      is an expression to be evaluated for side effects only.  */
 227
 228 ! DEFTREECODE (NULL_EXPR, "null_expr", 'e', 1)
 229
 230   /* An expression that emits a USE for its single operand.  */
 231
 232 ! DEFTREECODE (USE_EXPR, "use_expr", 'e', 1)
 233
 234   /* An expression that is treated as a conversion while generating code, but is
 235      used to prevent infinite recursion when conversions of biased types are
 236      involved.  */
 237
 238 ! DEFTREECODE (GNAT_NOP_EXPR, "gnat_nop_expr", '1', 1)
 239