gcc/java/builtins.c

   1 /* Built-in and inline functions for gcj
   2    Copyright (C) 2001, 2003
   3    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 2, 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 COPYING.  If not, write to
  19 the Free Software Foundation, 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.
  21
  22 Java and all Java-based marks are trademarks or registered trademarks
  23 of Sun Microsystems, Inc. in the United States and other countries.
  24 The Free Software Foundation is independent of Sun Microsystems, Inc.  */
  25
  26 /* Written by Tom Tromey <tromey@redhat.com>.  */
  27
  28 #include "config.h"
  29 #include "system.h"
  30 #include "coretypes.h"
  31 #include "tm.h"
  32 #include "tree.h"
  33 #include "ggc.h"
  34 #include "flags.h"
  35 #include "langhooks.h"
  36 #include "java-tree.h"
  37
  38 enum builtin_type
  39 {
  40 #define DEF_PRIMITIVE_TYPE(NAME, VALUE) NAME,
  41 #define DEF_FUNCTION_TYPE_0(NAME, RETURN) NAME,
  42 #define DEF_FUNCTION_TYPE_1(NAME, RETURN, ARG1) NAME,
  43 #define DEF_FUNCTION_TYPE_2(NAME, RETURN, ARG1, ARG2) NAME,
  44 #define DEF_FUNCTION_TYPE_3(NAME, RETURN, ARG1, ARG2, ARG3) NAME,
  45 #define DEF_FUNCTION_TYPE_4(NAME, RETURN, ARG1, ARG2, ARG3, ARG4) NAME,
  46 #define DEF_FUNCTION_TYPE_VAR_0(NAME, RETURN) NAME,
  47 #define DEF_FUNCTION_TYPE_VAR_1(NAME, RETURN, ARG1) NAME,
  48 #define DEF_FUNCTION_TYPE_VAR_2(NAME, RETURN, ARG1, ARG2) NAME,
  49 #define DEF_POINTER_TYPE(NAME, TYPE) NAME,
  50 #include "builtin-types.def"
  51 #undef DEF_PRIMITIVE_TYPE
  52 #undef DEF_FUNCTION_TYPE_0
  53 #undef DEF_FUNCTION_TYPE_1
  54 #undef DEF_FUNCTION_TYPE_2
  55 #undef DEF_FUNCTION_TYPE_3
  56 #undef DEF_FUNCTION_TYPE_4
  57 #undef DEF_FUNCTION_TYPE_VAR_0
  58 #undef DEF_FUNCTION_TYPE_VAR_1
  59 #undef DEF_FUNCTION_TYPE_VAR_2
  60 #undef DEF_POINTER_TYPE
  61   BT_LAST
  62 };
  63
  64 static tree max_builtin (tree, tree);
  65 static tree min_builtin (tree, tree);
  66 static tree abs_builtin (tree, tree);
  67 static tree cos_builtin (tree, tree);
  68 static tree sin_builtin (tree, tree);
  69 static tree sqrt_builtin (tree, tree);
  70
  71 static tree java_build_function_call_expr (tree, tree);
  72 static void define_builtin (enum built_in_function, const char *,
  73                             enum built_in_class, tree, int, int);
  74 static tree define_builtin_type (int, int, int, int, int);
  75
  76 \f
  77
  78 /* Functions of this type are used to inline a given call.  Such a
  79    function should either return an expression, if the call is to be
  80    inlined, or NULL_TREE if a real call should be emitted.  Arguments
  81    are method return type and arguments to call.  */
  82 typedef tree builtin_creator_function PARAMS ((tree, tree));
  83
  84 /* Hold a char*, before initialization, or a tree, after
  85    initialization.  */
  86 union string_or_tree GTY(())
  87 {
  88   const char * GTY ((tag ("0"))) s;
  89   tree GTY ((tag ("1"))) t;
  90 };
  91
  92 /* Used to hold a single builtin record.  */
  93 struct builtin_record GTY(())
  94 {
  95   union string_or_tree GTY ((desc ("1"))) class_name;
  96   union string_or_tree GTY ((desc ("1"))) method_name;
  97   builtin_creator_function * GTY((skip (""))) creator;
  98 };
  99
 100 static GTY(()) struct builtin_record java_builtins[] =
 101 {
 102   { { "java.lang.Math" }, { "min" }, min_builtin },
 103   { { "java.lang.Math" }, { "max" }, max_builtin },
 104   { { "java.lang.Math" }, { "abs" }, abs_builtin },
 105   { { "java.lang.Math" }, { "cos" }, cos_builtin },
 106   { { "java.lang.Math" }, { "sin" }, sin_builtin },
 107   { { "java.lang.Math" }, { "sqrt" }, sqrt_builtin },
 108   { { NULL }, { NULL }, NULL }
 109 };
 110
 111 /* This is only used transiently, so we don't mark it as roots for the
 112    GC.  */
 113 static tree builtin_types[(int) BT_LAST];
 114
 115 \f
 116 /* Internal functions which implement various builtin conversions.  */
 117
 118 static tree
 119 max_builtin (tree method_return_type, tree method_arguments)
 120 {
 121   return build (MAX_EXPR, method_return_type,
 122                 TREE_VALUE (method_arguments),
 123                 TREE_VALUE (TREE_CHAIN (method_arguments)));
 124 }
 125
 126 static tree
 127 min_builtin (tree method_return_type, tree method_arguments)
 128 {
 129   return build (MIN_EXPR, method_return_type,
 130                 TREE_VALUE (method_arguments),
 131                 TREE_VALUE (TREE_CHAIN (method_arguments)));
 132 }
 133
 134 static tree
 135 abs_builtin (tree method_return_type, tree method_arguments)
 136 {
 137   return build1 (ABS_EXPR, method_return_type,
 138                  TREE_VALUE (method_arguments));
 139 }
 140
 141 /* Mostly copied from ../builtins.c.  */
 142 static tree
 143 java_build_function_call_expr (tree fn, tree arglist)
 144 {
 145   tree call_expr;
 146
 147   call_expr = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (fn)), fn);
 148   call_expr = build (CALL_EXPR, TREE_TYPE (TREE_TYPE (fn)),
 149                      call_expr, arglist);
 150   TREE_SIDE_EFFECTS (call_expr) = 1;
 151   return call_expr;
 152 }
 153
 154 static tree
 155 cos_builtin (tree method_return_type ATTRIBUTE_UNUSED, tree method_arguments)
 156 {
 157   /* FIXME: this assumes that jdouble and double are the same.  */
 158   tree fn = built_in_decls[BUILT_IN_COS];
 159   if (fn == NULL_TREE)
 160     return NULL_TREE;
 161   return java_build_function_call_expr (fn, method_arguments);
 162 }
 163
 164 static tree
 165 sin_builtin (tree method_return_type ATTRIBUTE_UNUSED, tree method_arguments)
 166 {
 167   /* FIXME: this assumes that jdouble and double are the same.  */
 168   tree fn = built_in_decls[BUILT_IN_SIN];
 169   if (fn == NULL_TREE)
 170     return NULL_TREE;
 171   return java_build_function_call_expr (fn, method_arguments);
 172 }
 173
 174 static tree
 175 sqrt_builtin (tree method_return_type ATTRIBUTE_UNUSED, tree method_arguments)
 176 {
 177   /* FIXME: this assumes that jdouble and double are the same.  */
 178   tree fn = built_in_decls[BUILT_IN_SQRT];
 179   if (fn == NULL_TREE)
 180     return NULL_TREE;
 181   return java_build_function_call_expr (fn, method_arguments);
 182 }
 183
 184 \f
 185
 186 /* Define a single builtin.  */
 187 static void
 188 define_builtin (enum built_in_function val,
 189                 const char *name,
 190                 enum built_in_class class,
 191                 tree type,
 192                 int fallback_p,
 193                 int implicit)
 194 {
 195   tree decl;
 196
 197   if (! name || ! type)
 198     return;
 199
 200   if (strncmp (name, "__builtin_", strlen ("__builtin_")) != 0)
 201     abort ();
 202   decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
 203   DECL_EXTERNAL (decl) = 1;
 204   TREE_PUBLIC (decl) = 1;
 205   if (fallback_p)
 206     SET_DECL_ASSEMBLER_NAME (decl,
 207                              get_identifier (name + strlen ("__builtin_")));
 208   make_decl_rtl (decl, NULL);
 209   pushdecl (decl);
 210   DECL_BUILT_IN_CLASS (decl) = class;
 211   DECL_FUNCTION_CODE (decl) = val;
 212   built_in_decls[val] = decl;
 213   if (implicit)
 214     implicit_built_in_decls[val] = decl;
 215 }
 216
 217 /* Compute the type for a builtin.  */
 218 static tree
 219 define_builtin_type (int ret, int arg1, int arg2, int arg3, int arg4)
 220 {
 221   tree args;
 222
 223   if (builtin_types[ret] == NULL_TREE)
 224     return NULL_TREE;
 225
 226   args = void_list_node;
 227
 228   if (arg4 != -1)
 229     {
 230       if (builtin_types[arg4] == NULL_TREE)
 231         return NULL_TREE;
 232       args = tree_cons (NULL_TREE, builtin_types[arg4], args);
 233     }
 234   if (arg3 != -1)
 235     {
 236       if (builtin_types[arg3] == NULL_TREE)
 237         return NULL_TREE;
 238       args = tree_cons (NULL_TREE, builtin_types[arg3], args);
 239     }
 240   if (arg2 != -1)
 241     {
 242       if (builtin_types[arg2] == NULL_TREE)
 243         return NULL_TREE;
 244       args = tree_cons (NULL_TREE, builtin_types[arg2], args);
 245     }
 246   if (arg1 != -1)
 247     {
 248       if (builtin_types[arg1] == NULL_TREE)
 249         return NULL_TREE;
 250       args = tree_cons (NULL_TREE, builtin_types[arg1], args);
 251     }
 252
 253   return build_function_type (builtin_types[ret], args);
 254 }
 255
 256 \f
 257
 258 /* Initialize the builtins.  */
 259 void
 260 initialize_builtins (void)
 261 {
 262   int i;
 263
 264   for (i = 0; java_builtins[i].creator != NULL; ++i)
 265     {
 266       tree klass_id = get_identifier (java_builtins[i].class_name.s);
 267       tree m = get_identifier (java_builtins[i].method_name.s);
 268
 269       java_builtins[i].class_name.t = klass_id;
 270       java_builtins[i].method_name.t = m;
 271     }
 272
 273   void_list_node = end_params_node;
 274
 275   /* Work around C-specific junk in builtin-types.def.  */
 276 #define intmax_type_node NULL_TREE
 277 #define c_size_type_node NULL_TREE
 278 #define const_string_type_node NULL_TREE
 279 #define va_list_ref_type_node NULL_TREE
 280 #define va_list_arg_type_node NULL_TREE
 281 #define flag_isoc99 0
 282
 283 #define DEF_PRIMITIVE_TYPE(ENUM, VALUE)                                       \
 284   builtin_types[(int) ENUM] = VALUE;
 285 #define DEF_FUNCTION_TYPE_0(ENUM, RETURN)               \
 286   builtin_types[(int) ENUM]                             \
 287     = define_builtin_type (RETURN, -1, -1, -1, -1);
 288 #define DEF_FUNCTION_TYPE_1(ENUM, RETURN, ARG1)                         \
 289   builtin_types[(int) ENUM]                                             \
 290     = define_builtin_type (RETURN, ARG1, -1, -1, -1);
 291 #define DEF_FUNCTION_TYPE_2(ENUM, RETURN, ARG1, ARG2)   \
 292   builtin_types[(int) ENUM]                             \
 293     = define_builtin_type (RETURN, ARG1, ARG2, -1, -1);
 294 #define DEF_FUNCTION_TYPE_3(ENUM, RETURN, ARG1, ARG2, ARG3)              \
 295   builtin_types[(int) ENUM]                                              \
 296     = define_builtin_type (RETURN, ARG1, ARG2, ARG3, -1);
 297 #define DEF_FUNCTION_TYPE_4(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4)       \
 298   builtin_types[(int) ENUM]                                             \
 299     = define_builtin_type (RETURN, ARG1, ARG2, ARG3, ARG4);
 300 #define DEF_FUNCTION_TYPE_VAR_0(ENUM, RETURN)                                 \
 301   builtin_types[(int) ENUM] = NULL_TREE;
 302 #define DEF_FUNCTION_TYPE_VAR_1(ENUM, RETURN, ARG1)                      \
 303    builtin_types[(int) ENUM] = NULL_TREE;
 304 #define DEF_FUNCTION_TYPE_VAR_2(ENUM, RETURN, ARG1, ARG2)       \
 305    builtin_types[(int) ENUM] = NULL_TREE;
 306 #define DEF_POINTER_TYPE(ENUM, TYPE)                    \
 307   builtin_types[(int) ENUM] = NULL_TREE;
 308
 309 #include "builtin-types.def"
 310
 311 #define DEF_BUILTIN(ENUM, NAME, CLASS, TYPE, LIBTYPE, BOTH_P, \
 312                     FALLBACK_P, NONANSI_P, ATTRS, IMPLICIT) \
 313   define_builtin (ENUM, NAME, CLASS, builtin_types[TYPE], FALLBACK_P, IMPLICIT);
 314 #include "builtins.def"
 315 }
 316
 317 /* If the call matches a builtin, return the
 318    appropriate builtin expression instead.  */
 319 tree
 320 check_for_builtin (tree method, tree call)
 321 {
 322   if (! flag_emit_class_files && optimize && TREE_CODE (call) == CALL_EXPR)
 323     {
 324       int i;
 325       tree method_arguments = TREE_OPERAND (call, 1);
 326       tree method_class = DECL_NAME (TYPE_NAME (DECL_CONTEXT (method)));
 327       tree method_name = DECL_NAME (method);
 328       tree method_return_type = TREE_TYPE (TREE_TYPE (method));
 329
 330       for (i = 0; java_builtins[i].creator != NULL; ++i)
 331         {
 332           if (method_class == java_builtins[i].class_name.t
 333               && method_name == java_builtins[i].method_name.t)
 334             {
 335               return (*java_builtins[i].creator) (method_return_type,
 336                                                   method_arguments);
 337             }
 338         }
 339     }
 340   return call;
 341 }
 342
 343 #include "gt-java-builtins.h"