gcc/java/builtins.c

   1 /* Built-in and inline functions for gcj
   2    Copyright (C) 2001, 2003, 2004, 2005, 2006
   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, 51 Franklin Street, Fifth Floor,
  20 Boston, MA 02110-1301, 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
  39 static tree max_builtin (tree, tree);
  40 static tree min_builtin (tree, tree);
  41 static tree abs_builtin (tree, tree);
  42 static tree convert_real (tree, tree);
  43
  44 static tree java_build_function_call_expr (tree, tree);
  45
  46 \f
  47
  48 /* Functions of this type are used to inline a given call.  Such a
  49    function should either return an expression, if the call is to be
  50    inlined, or NULL_TREE if a real call should be emitted.  Arguments
  51    are method return type and arguments to call.  */
  52 typedef tree builtin_creator_function (tree, tree);
  53
  54 /* Hold a char*, before initialization, or a tree, after
  55    initialization.  */
  56 union string_or_tree GTY(())
  57 {
  58   const char * GTY ((tag ("0"))) s;
  59   tree GTY ((tag ("1"))) t;
  60 };
  61
  62 /* Used to hold a single builtin record.  */
  63 struct builtin_record GTY(())
  64 {
  65   union string_or_tree GTY ((desc ("1"))) class_name;
  66   union string_or_tree GTY ((desc ("1"))) method_name;
  67   builtin_creator_function * GTY((skip)) creator;
  68   enum built_in_function builtin_code;
  69 };
  70
  71 static GTY(()) struct builtin_record java_builtins[] =
  72 {
  73   { { "java.lang.Math" }, { "min" }, min_builtin, 0 },
  74   { { "java.lang.Math" }, { "max" }, max_builtin, 0 },
  75   { { "java.lang.Math" }, { "abs" }, abs_builtin, 0 },
  76   { { "java.lang.Math" }, { "acos" }, NULL, BUILT_IN_ACOS },
  77   { { "java.lang.Math" }, { "asin" }, NULL, BUILT_IN_ASIN },
  78   { { "java.lang.Math" }, { "atan" }, NULL, BUILT_IN_ATAN },
  79   { { "java.lang.Math" }, { "atan2" }, NULL, BUILT_IN_ATAN2 },
  80   { { "java.lang.Math" }, { "ceil" }, NULL, BUILT_IN_CEIL },
  81   { { "java.lang.Math" }, { "cos" }, NULL, BUILT_IN_COS },
  82   { { "java.lang.Math" }, { "exp" }, NULL, BUILT_IN_EXP },
  83   { { "java.lang.Math" }, { "floor" }, NULL, BUILT_IN_FLOOR },
  84   { { "java.lang.Math" }, { "log" }, NULL, BUILT_IN_LOG },
  85   { { "java.lang.Math" }, { "pow" }, NULL, BUILT_IN_POW },
  86   { { "java.lang.Math" }, { "sin" }, NULL, BUILT_IN_SIN },
  87   { { "java.lang.Math" }, { "sqrt" }, NULL, BUILT_IN_SQRT },
  88   { { "java.lang.Math" }, { "tan" }, NULL, BUILT_IN_TAN },
  89   { { "java.lang.Float" }, { "intBitsToFloat" }, convert_real, 0 },
  90   { { "java.lang.Double" }, { "longBitsToDouble" }, convert_real, 0 },
  91   { { "java.lang.Float" }, { "floatToRawIntBits" }, convert_real, 0 },
  92   { { "java.lang.Double" }, { "doubleToRawLongBits" }, convert_real, 0 },
  93   { { NULL }, { NULL }, NULL, END_BUILTINS }
  94 };
  95
  96 \f
  97 /* Internal functions which implement various builtin conversions.  */
  98
  99 static tree
 100 max_builtin (tree method_return_type, tree method_arguments)
 101 {
 102   /* MAX_EXPR does not handle -0.0 in the Java style.  */
 103   if (TREE_CODE (method_return_type) == REAL_TYPE)
 104     return NULL_TREE;
 105   return fold_build2 (MAX_EXPR, method_return_type,
 106                       TREE_VALUE (method_arguments),
 107                       TREE_VALUE (TREE_CHAIN (method_arguments)));
 108 }
 109
 110 static tree
 111 min_builtin (tree method_return_type, tree method_arguments)
 112 {
 113   /* MIN_EXPR does not handle -0.0 in the Java style.  */
 114   if (TREE_CODE (method_return_type) == REAL_TYPE)
 115     return NULL_TREE;
 116   return fold_build2 (MIN_EXPR, method_return_type,
 117                       TREE_VALUE (method_arguments),
 118                       TREE_VALUE (TREE_CHAIN (method_arguments)));
 119 }
 120
 121 static tree
 122 abs_builtin (tree method_return_type, tree method_arguments)
 123 {
 124   return fold_build1 (ABS_EXPR, method_return_type,
 125                       TREE_VALUE (method_arguments));
 126 }
 127
 128 /* Mostly copied from ../builtins.c.  */
 129 static tree
 130 java_build_function_call_expr (tree fn, tree arglist)
 131 {
 132   tree call_expr;
 133
 134   call_expr = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (fn)), fn);
 135   return fold_build3 (CALL_EXPR, TREE_TYPE (TREE_TYPE (fn)),
 136                       call_expr, arglist, NULL_TREE);
 137 }
 138
 139 static tree
 140 convert_real (tree method_return_type, tree method_arguments)
 141 {
 142   return build1 (VIEW_CONVERT_EXPR, method_return_type,
 143                  TREE_VALUE (method_arguments));
 144 }
 145
 146 \f
 147
 148 #define BUILTIN_NOTHROW 1
 149 #define BUILTIN_CONST 2
 150 /* Define a single builtin.  */
 151 static void
 152 define_builtin (enum built_in_function val,
 153                 const char *name,
 154                 tree type,
 155                 const char *libname,
 156                 int flags)
 157 {
 158   tree decl;
 159
 160   decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
 161   DECL_EXTERNAL (decl) = 1;
 162   TREE_PUBLIC (decl) = 1;
 163   SET_DECL_ASSEMBLER_NAME (decl, get_identifier (libname));
 164   pushdecl (decl);
 165   DECL_BUILT_IN_CLASS (decl) = BUILT_IN_NORMAL;
 166   DECL_FUNCTION_CODE (decl) = val;
 167   if (flags & BUILTIN_NOTHROW)
 168     TREE_NOTHROW (decl) = 1;
 169   if (flags & BUILTIN_CONST)
 170     TREE_READONLY (decl) = 1;
 171
 172   implicit_built_in_decls[val] = decl;
 173   built_in_decls[val] = decl;
 174 }
 175
 176 \f
 177
 178 /* Initialize the builtins.  */
 179 void
 180 initialize_builtins (void)
 181 {
 182   tree double_ftype_double, double_ftype_double_double;
 183   tree float_ftype_float, float_ftype_float_float;
 184   tree boolean_ftype_boolean_boolean;
 185   tree t;
 186   int i;
 187
 188   for (i = 0; java_builtins[i].builtin_code != END_BUILTINS; ++i)
 189     {
 190       tree klass_id = get_identifier (java_builtins[i].class_name.s);
 191       tree m = get_identifier (java_builtins[i].method_name.s);
 192
 193       java_builtins[i].class_name.t = klass_id;
 194       java_builtins[i].method_name.t = m;
 195     }
 196
 197   void_list_node = end_params_node;
 198
 199   t = tree_cons (NULL_TREE, float_type_node, end_params_node);
 200   float_ftype_float = build_function_type (float_type_node, t);
 201   t = tree_cons (NULL_TREE, float_type_node, t);
 202   float_ftype_float_float = build_function_type (float_type_node, t);
 203
 204   t = tree_cons (NULL_TREE, double_type_node, end_params_node);
 205   double_ftype_double = build_function_type (double_type_node, t);
 206   t = tree_cons (NULL_TREE, double_type_node, t);
 207   double_ftype_double_double = build_function_type (double_type_node, t);
 208
 209   define_builtin (BUILT_IN_FMOD, "__builtin_fmod",
 210                   double_ftype_double_double, "fmod", BUILTIN_CONST);
 211   define_builtin (BUILT_IN_FMODF, "__builtin_fmodf",
 212                   float_ftype_float_float, "fmodf", BUILTIN_CONST);
 213
 214   define_builtin (BUILT_IN_ACOS, "__builtin_acos",
 215                   double_ftype_double, "_ZN4java4lang4Math4acosEJdd",
 216                   BUILTIN_CONST);
 217   define_builtin (BUILT_IN_ASIN, "__builtin_asin",
 218                   double_ftype_double, "_ZN4java4lang4Math4asinEJdd",
 219                   BUILTIN_CONST);
 220   define_builtin (BUILT_IN_ATAN, "__builtin_atan",
 221                   double_ftype_double, "_ZN4java4lang4Math4atanEJdd",
 222                   BUILTIN_CONST);
 223   define_builtin (BUILT_IN_ATAN2, "__builtin_atan2",
 224                   double_ftype_double_double, "_ZN4java4lang4Math5atan2EJddd",
 225                   BUILTIN_CONST);
 226   define_builtin (BUILT_IN_CEIL, "__builtin_ceil",
 227                   double_ftype_double, "_ZN4java4lang4Math4ceilEJdd",
 228                   BUILTIN_CONST);
 229   define_builtin (BUILT_IN_COS, "__builtin_cos",
 230                   double_ftype_double, "_ZN4java4lang4Math3cosEJdd",
 231                   BUILTIN_CONST);
 232   define_builtin (BUILT_IN_EXP, "__builtin_exp",
 233                   double_ftype_double, "_ZN4java4lang4Math3expEJdd",
 234                   BUILTIN_CONST);
 235   define_builtin (BUILT_IN_FLOOR, "__builtin_floor",
 236                   double_ftype_double, "_ZN4java4lang4Math5floorEJdd",
 237                   BUILTIN_CONST);
 238   define_builtin (BUILT_IN_LOG, "__builtin_log",
 239                   double_ftype_double, "_ZN4java4lang4Math3logEJdd",
 240                   BUILTIN_CONST);
 241   define_builtin (BUILT_IN_POW, "__builtin_pow",
 242                   double_ftype_double_double, "_ZN4java4lang4Math3powEJddd",
 243                   BUILTIN_CONST);
 244   define_builtin (BUILT_IN_SIN, "__builtin_sin",
 245                   double_ftype_double, "_ZN4java4lang4Math3sinEJdd",
 246                   BUILTIN_CONST);
 247   define_builtin (BUILT_IN_SQRT, "__builtin_sqrt",
 248                   double_ftype_double, "_ZN4java4lang4Math4sqrtEJdd",
 249                   BUILTIN_CONST);
 250   define_builtin (BUILT_IN_TAN, "__builtin_tan",
 251                   double_ftype_double, "_ZN4java4lang4Math3tanEJdd",
 252                   BUILTIN_CONST);
 253
 254   t = tree_cons (NULL_TREE, boolean_type_node, end_params_node);
 255   t = tree_cons (NULL_TREE, boolean_type_node, t);
 256   boolean_ftype_boolean_boolean = build_function_type (boolean_type_node, t);
 257   define_builtin (BUILT_IN_EXPECT, "__builtin_expect",
 258                   boolean_ftype_boolean_boolean,
 259                   "__builtin_expect",
 260                   BUILTIN_CONST | BUILTIN_NOTHROW);
 261
 262   build_common_builtin_nodes ();
 263 }
 264
 265 /* If the call matches a builtin, return the
 266    appropriate builtin expression instead.  */
 267 tree
 268 check_for_builtin (tree method, tree call)
 269 {
 270   if (! flag_emit_class_files && optimize && TREE_CODE (call) == CALL_EXPR)
 271     {
 272       int i;
 273       tree method_arguments = TREE_OPERAND (call, 1);
 274       tree method_class = DECL_NAME (TYPE_NAME (DECL_CONTEXT (method)));
 275       tree method_name = DECL_NAME (method);
 276       tree method_return_type = TREE_TYPE (TREE_TYPE (method));
 277
 278       for (i = 0; java_builtins[i].builtin_code != END_BUILTINS; ++i)
 279         {
 280           if (method_class == java_builtins[i].class_name.t
 281               && method_name == java_builtins[i].method_name.t)
 282             {
 283               tree fn;
 284
 285               if (java_builtins[i].creator != NULL)
 286                 {
 287                   tree result
 288                     = (*java_builtins[i].creator) (method_return_type,
 289                                                    method_arguments);
 290                   return result == NULL_TREE ? call : result;
 291                 }
 292               fn = built_in_decls[java_builtins[i].builtin_code];
 293               if (fn == NULL_TREE)
 294                 return call;
 295               return java_build_function_call_expr (fn, method_arguments);
 296             }
 297         }
 298     }
 299   return call;
 300 }
 301
 302 #include "gt-java-builtins.h"