gcc/java/builtins.c

   1 /* Built-in and inline functions for gcj
   2    Copyright (C) 2001
   3    Free Software Foundation, Inc.
   4
   5 This file is part of GNU CC.
   6
   7 GNU CC 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 GNU CC 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 GNU CC; 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 "tree.h"
  31 #include "ggc.h"
  32 #include "flags.h"
  33
  34 #include "java-tree.h"
  35
  36 enum builtin_type
  37 {
  38 #define DEF_PRIMITIVE_TYPE(NAME, VALUE) NAME,
  39 #define DEF_FUNCTION_TYPE_0(NAME, RETURN) NAME,
  40 #define DEF_FUNCTION_TYPE_1(NAME, RETURN, ARG1) NAME,
  41 #define DEF_FUNCTION_TYPE_2(NAME, RETURN, ARG1, ARG2) NAME,
  42 #define DEF_FUNCTION_TYPE_3(NAME, RETURN, ARG1, ARG2, ARG3) NAME,
  43 #define DEF_FUNCTION_TYPE_4(NAME, RETURN, ARG1, ARG2, ARG3, ARG4) NAME,
  44 #define DEF_FUNCTION_TYPE_VAR_0(NAME, RETURN) NAME,
  45 #define DEF_FUNCTION_TYPE_VAR_1(NAME, RETURN, ARG1) NAME,
  46 #define DEF_FUNCTION_TYPE_VAR_2(NAME, RETURN, ARG1, ARG2) NAME,
  47 #define DEF_POINTER_TYPE(NAME, TYPE) NAME,
  48 #include "builtin-types.def"
  49 #undef DEF_PRIMITIVE_TYPE
  50 #undef DEF_FUNCTION_TYPE_0
  51 #undef DEF_FUNCTION_TYPE_1
  52 #undef DEF_FUNCTION_TYPE_2
  53 #undef DEF_FUNCTION_TYPE_3
  54 #undef DEF_FUNCTION_TYPE_4
  55 #undef DEF_FUNCTION_TYPE_VAR_0
  56 #undef DEF_FUNCTION_TYPE_VAR_1
  57 #undef DEF_FUNCTION_TYPE_VAR_2
  58 #undef DEF_POINTER_TYPE
  59   BT_LAST
  60 };
  61
  62 static tree max_builtin PARAMS ((tree, tree));
  63 static tree min_builtin PARAMS ((tree, tree));
  64 static tree abs_builtin PARAMS ((tree, tree));
  65 static tree cos_builtin PARAMS ((tree, tree));
  66 static tree sin_builtin PARAMS ((tree, tree));
  67 static tree sqrt_builtin PARAMS ((tree, tree));
  68
  69 static tree build_function_call_expr PARAMS ((tree, tree));
  70 static void define_builtin PARAMS ((enum built_in_function,
  71                                     const char *,
  72                                     enum built_in_class,
  73                                     tree, int));
  74 static tree define_builtin_type PARAMS ((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
  87 {
  88   const char *s;
  89   tree t;
  90 };
  91
  92 /* Used to hold a single builtin record.  */
  93 struct builtin_record
  94 {
  95   union string_or_tree class_name;
  96   union string_or_tree method_name;
  97   builtin_creator_function *creator;
  98 };
  99
 100 static 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 (method_return_type, method_arguments)
 120      tree method_return_type, method_arguments;
 121 {
 122   return build (MAX_EXPR, method_return_type,
 123                 TREE_VALUE (method_arguments),
 124                 TREE_VALUE (TREE_CHAIN (method_arguments)));
 125 }
 126
 127 static tree
 128 min_builtin (method_return_type, method_arguments)
 129      tree method_return_type, method_arguments;
 130 {
 131   return build (MIN_EXPR, method_return_type,
 132                 TREE_VALUE (method_arguments),
 133                 TREE_VALUE (TREE_CHAIN (method_arguments)));
 134 }
 135
 136 static tree
 137 abs_builtin (method_return_type, method_arguments)
 138      tree method_return_type, method_arguments;
 139 {
 140   return build1 (ABS_EXPR, method_return_type,
 141                  TREE_VALUE (method_arguments));
 142 }
 143
 144 /* Mostly copied from ../builtins.c.  */
 145 static tree
 146 build_function_call_expr (tree fn, tree arglist)
 147 {
 148   tree call_expr;
 149
 150   call_expr = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (fn)), fn);
 151   call_expr = build (CALL_EXPR, TREE_TYPE (TREE_TYPE (fn)),
 152                      call_expr, arglist);
 153   TREE_SIDE_EFFECTS (call_expr) = 1;
 154   return call_expr;
 155 }
 156
 157 static tree
 158 cos_builtin (method_return_type, method_arguments)
 159      tree method_return_type ATTRIBUTE_UNUSED, method_arguments;
 160 {
 161   /* FIXME: this assumes that jdouble and double are the same.  */
 162   tree fn = built_in_decls[BUILT_IN_COS];
 163   if (fn == NULL_TREE)
 164     return NULL_TREE;
 165   return build_function_call_expr (fn, method_arguments);
 166 }
 167
 168 static tree
 169 sin_builtin (method_return_type, method_arguments)
 170      tree method_return_type ATTRIBUTE_UNUSED, method_arguments;
 171 {
 172   /* FIXME: this assumes that jdouble and double are the same.  */
 173   tree fn = built_in_decls[BUILT_IN_SIN];
 174   if (fn == NULL_TREE)
 175     return NULL_TREE;
 176   return build_function_call_expr (fn, method_arguments);
 177 }
 178
 179 static tree
 180 sqrt_builtin (method_return_type, method_arguments)
 181      tree method_return_type ATTRIBUTE_UNUSED, method_arguments;
 182 {
 183   /* FIXME: this assumes that jdouble and double are the same.  */
 184   tree fn = built_in_decls[BUILT_IN_SQRT];
 185   if (fn == NULL_TREE)
 186     return NULL_TREE;
 187   return build_function_call_expr (fn, method_arguments);
 188 }
 189
 190 \f
 191
 192 /* Define a single builtin.  */
 193 static void
 194 define_builtin (val, name, class, type, fallback_p)
 195      enum built_in_function val;
 196      const char *name;
 197      enum built_in_class class;
 198      tree type;
 199      int fallback_p;
 200 {
 201   tree decl;
 202
 203   if (! name || ! type)
 204     return;
 205
 206   if (strncmp (name, "__builtin_", strlen ("__builtin_")) != 0)
 207     abort ();
 208   decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
 209   DECL_EXTERNAL (decl) = 1;
 210   TREE_PUBLIC (decl) = 1;
 211   if (fallback_p)
 212     SET_DECL_ASSEMBLER_NAME (decl,
 213                              get_identifier (name + strlen ("__builtin_")));
 214   make_decl_rtl (decl, NULL);
 215   pushdecl (decl);
 216   DECL_BUILT_IN_CLASS (decl) = class;
 217   DECL_FUNCTION_CODE (decl) = val;
 218   built_in_decls[val] = decl;
 219 }
 220
 221 /* Compute the type for a builtin.  */
 222 static tree
 223 define_builtin_type (ret, arg1, arg2, arg3, arg4)
 224      int ret, arg1, arg2, arg3, arg4;
 225 {
 226   tree args;
 227
 228   if (builtin_types[ret] == NULL_TREE)
 229     return NULL_TREE;
 230
 231   args = void_list_node;
 232
 233   if (arg4 != -1)
 234     {
 235       if (builtin_types[arg4] == NULL_TREE)
 236         return NULL_TREE;
 237       args = tree_cons (NULL_TREE, builtin_types[arg4], args);
 238     }
 239   if (arg3 != -1)
 240     {
 241       if (builtin_types[arg3] == NULL_TREE)
 242         return NULL_TREE;
 243       args = tree_cons (NULL_TREE, builtin_types[arg3], args);
 244     }
 245   if (arg2 != -1)
 246     {
 247       if (builtin_types[arg2] == NULL_TREE)
 248         return NULL_TREE;
 249       args = tree_cons (NULL_TREE, builtin_types[arg2], args);
 250     }
 251   if (arg1 != -1)
 252     {
 253       if (builtin_types[arg1] == NULL_TREE)
 254         return NULL_TREE;
 255       args = tree_cons (NULL_TREE, builtin_types[arg1], args);
 256     }
 257
 258   return build_function_type (builtin_types[ret], args);
 259 }
 260
 261 \f
 262
 263 /* Initialize the builtins.  */
 264 void
 265 initialize_builtins ()
 266 {
 267   int i;
 268
 269   for (i = 0; java_builtins[i].creator != NULL; ++i)
 270     {
 271       tree klass_id = get_identifier (java_builtins[i].class_name.s);
 272       tree m = get_identifier (java_builtins[i].method_name.s);
 273
 274       java_builtins[i].class_name.t = klass_id;
 275       java_builtins[i].method_name.t = m;
 276       ggc_add_tree_root (&java_builtins[i].class_name.t, 1);
 277       ggc_add_tree_root (&java_builtins[i].method_name.t, 1);
 278     }
 279
 280   void_list_node = end_params_node;
 281
 282   /* Work around C-specific junk in builtin-types.def.  */
 283 #define intmax_type_node NULL_TREE
 284 #define traditional_ptr_type_node NULL_TREE
 285 #define traditional_cptr_type_node NULL_TREE
 286 #define c_size_type_node NULL_TREE
 287 #define const_string_type_node NULL_TREE
 288 #define traditional_len_type_node NULL_TREE
 289 #define va_list_ref_type_node NULL_TREE
 290 #define va_list_arg_type_node NULL_TREE
 291 #define flag_isoc99 0
 292
 293 #define DEF_PRIMITIVE_TYPE(ENUM, VALUE)                                       \
 294   builtin_types[(int) ENUM] = VALUE;
 295 #define DEF_FUNCTION_TYPE_0(ENUM, RETURN)               \
 296   builtin_types[(int) ENUM]                             \
 297     = define_builtin_type (RETURN, -1, -1, -1, -1);
 298 #define DEF_FUNCTION_TYPE_1(ENUM, RETURN, ARG1)                         \
 299   builtin_types[(int) ENUM]                                             \
 300     = define_builtin_type (RETURN, ARG1, -1, -1, -1);
 301 #define DEF_FUNCTION_TYPE_2(ENUM, RETURN, ARG1, ARG2)   \
 302   builtin_types[(int) ENUM]                             \
 303     = define_builtin_type (RETURN, ARG1, ARG2, -1, -1);
 304 #define DEF_FUNCTION_TYPE_3(ENUM, RETURN, ARG1, ARG2, ARG3)              \
 305   builtin_types[(int) ENUM]                                              \
 306     = define_builtin_type (RETURN, ARG1, ARG2, ARG3, -1);
 307 #define DEF_FUNCTION_TYPE_4(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4)       \
 308   builtin_types[(int) ENUM]                                             \
 309     = define_builtin_type (RETURN, ARG1, ARG2, ARG3, ARG4);
 310 #define DEF_FUNCTION_TYPE_VAR_0(ENUM, RETURN)                                 \
 311   builtin_types[(int) ENUM] = NULL_TREE;
 312 #define DEF_FUNCTION_TYPE_VAR_1(ENUM, RETURN, ARG1)                      \
 313    builtin_types[(int) ENUM] = NULL_TREE;
 314 #define DEF_FUNCTION_TYPE_VAR_2(ENUM, RETURN, ARG1, ARG2)       \
 315    builtin_types[(int) ENUM] = NULL_TREE;
 316 #define DEF_POINTER_TYPE(ENUM, TYPE)                    \
 317   builtin_types[(int) ENUM] = NULL_TREE;
 318
 319 #include "builtin-types.def"
 320
 321 #define DEF_BUILTIN(ENUM, NAME, CLASS, TYPE, LIBTYPE, BOTH_P, \
 322                     FALLBACK_P, NONANSI_P) \
 323   define_builtin (ENUM, NAME, CLASS, builtin_types[TYPE], FALLBACK_P);
 324 #include "builtins.def"
 325 }
 326
 327 /* If the call matches a builtin, return the
 328    appropriate builtin expression instead.  */
 329 tree
 330 check_for_builtin (method, call)
 331      tree method;
 332      tree call;
 333 {
 334   if (! flag_emit_class_files && optimize && TREE_CODE (call) == CALL_EXPR)
 335     {
 336       int i;
 337       tree method_arguments = TREE_OPERAND (call, 1);
 338       tree method_class = DECL_NAME (TYPE_NAME (DECL_CONTEXT (method)));
 339       tree method_name = DECL_NAME (method);
 340       tree method_return_type = TREE_TYPE (TREE_TYPE (method));
 341
 342       for (i = 0; java_builtins[i].creator != NULL; ++i)
 343         {
 344           if (method_class == java_builtins[i].class_name.t
 345               && method_name == java_builtins[i].method_name.t)
 346             {
 347               return (*java_builtins[i].creator) (method_return_type,
 348                                                   method_arguments);
 349             }
 350         }
 351     }
 352   return call;
 353 }