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
  39 static tree max_builtin (tree, tree);
  40 static tree min_builtin (tree, tree);
  41 static tree abs_builtin (tree, tree);
  42
  43 static tree java_build_function_call_expr (tree, tree);
  44 static void define_builtin (enum built_in_function, const char *,
  45                             tree, const char *);
  46
  47 \f
  48
  49 /* Functions of this type are used to inline a given call.  Such a
  50    function should either return an expression, if the call is to be
  51    inlined, or NULL_TREE if a real call should be emitted.  Arguments
  52    are method return type and arguments to call.  */
  53 typedef tree builtin_creator_function (tree, tree);
  54
  55 /* Hold a char*, before initialization, or a tree, after
  56    initialization.  */
  57 union string_or_tree GTY(())
  58 {
  59   const char * GTY ((tag ("0"))) s;
  60   tree GTY ((tag ("1"))) t;
  61 };
  62
  63 /* Used to hold a single builtin record.  */
  64 struct builtin_record GTY(())
  65 {
  66   union string_or_tree GTY ((desc ("1"))) class_name;
  67   union string_or_tree GTY ((desc ("1"))) method_name;
  68   builtin_creator_function * GTY((skip (""))) creator;
  69   enum built_in_function builtin_code;
  70 };
  71
  72 static GTY(()) struct builtin_record java_builtins[] =
  73 {
  74   { { "java.lang.Math" }, { "min" }, min_builtin, 0 },
  75   { { "java.lang.Math" }, { "max" }, max_builtin, 0 },
  76   { { "java.lang.Math" }, { "abs" }, abs_builtin, 0 },
  77   { { "java.lang.Math" }, { "atan" }, NULL, BUILT_IN_ATAN },
  78   { { "java.lang.Math" }, { "atan2" }, NULL, BUILT_IN_ATAN2 },
  79   { { "java.lang.Math" }, { "cos" }, NULL, BUILT_IN_COS },
  80   { { "java.lang.Math" }, { "exp" }, NULL, BUILT_IN_EXP },
  81   { { "java.lang.Math" }, { "log" }, NULL, BUILT_IN_LOG },
  82   { { "java.lang.Math" }, { "pow" }, NULL, BUILT_IN_POW },
  83   { { "java.lang.Math" }, { "sin" }, NULL, BUILT_IN_SIN },
  84   { { "java.lang.Math" }, { "sqrt" }, NULL, BUILT_IN_SQRT },
  85   { { "java.lang.Math" }, { "tan" }, NULL, BUILT_IN_TAN },
  86   { { NULL }, { NULL }, NULL, END_BUILTINS }
  87 };
  88
  89 \f
  90 /* Internal functions which implement various builtin conversions.  */
  91
  92 static tree
  93 max_builtin (tree method_return_type, tree method_arguments)
  94 {
  95   return fold (build (MAX_EXPR, method_return_type,
  96                       TREE_VALUE (method_arguments),
  97                       TREE_VALUE (TREE_CHAIN (method_arguments))));
  98 }
  99
 100 static tree
 101 min_builtin (tree method_return_type, tree method_arguments)
 102 {
 103   return fold (build (MIN_EXPR, method_return_type,
 104                       TREE_VALUE (method_arguments),
 105                       TREE_VALUE (TREE_CHAIN (method_arguments))));
 106 }
 107
 108 static tree
 109 abs_builtin (tree method_return_type, tree method_arguments)
 110 {
 111   return fold (build1 (ABS_EXPR, method_return_type,
 112                        TREE_VALUE (method_arguments)));
 113 }
 114
 115 /* Mostly copied from ../builtins.c.  */
 116 static tree
 117 java_build_function_call_expr (tree fn, tree arglist)
 118 {
 119   tree call_expr;
 120
 121   call_expr = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (fn)), fn);
 122   call_expr = build (CALL_EXPR, TREE_TYPE (TREE_TYPE (fn)),
 123                      call_expr, arglist);
 124   TREE_SIDE_EFFECTS (call_expr) = 1;
 125   return fold (call_expr);
 126 }
 127
 128 \f
 129
 130 /* Define a single builtin.  */
 131 static void
 132 define_builtin (enum built_in_function val,
 133                 const char *name,
 134                 tree type,
 135                 const char *libname)
 136 {
 137   tree decl;
 138
 139   decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
 140   DECL_EXTERNAL (decl) = 1;
 141   TREE_PUBLIC (decl) = 1;
 142   SET_DECL_ASSEMBLER_NAME (decl, get_identifier (libname));
 143   make_decl_rtl (decl, NULL);
 144   pushdecl (decl);
 145   DECL_BUILT_IN_CLASS (decl) = BUILT_IN_NORMAL;
 146   DECL_FUNCTION_CODE (decl) = val;
 147
 148   implicit_built_in_decls[val] = decl;
 149   built_in_decls[val] = decl;
 150 }
 151
 152 \f
 153
 154 /* Initialize the builtins.  */
 155 void
 156 initialize_builtins (void)
 157 {
 158   tree double_ftype_double, double_ftype_double_double;
 159   tree float_ftype_float, float_ftype_float_float;
 160   tree t;
 161   int i;
 162
 163   for (i = 0; java_builtins[i].builtin_code != END_BUILTINS; ++i)
 164     {
 165       tree klass_id = get_identifier (java_builtins[i].class_name.s);
 166       tree m = get_identifier (java_builtins[i].method_name.s);
 167
 168       java_builtins[i].class_name.t = klass_id;
 169       java_builtins[i].method_name.t = m;
 170     }
 171
 172   void_list_node = end_params_node;
 173
 174   t = tree_cons (NULL_TREE, float_type_node, end_params_node);
 175   float_ftype_float = build_function_type (float_type_node, t);
 176   t = tree_cons (NULL_TREE, float_type_node, t);
 177   float_ftype_float_float = build_function_type (float_type_node, t);
 178
 179   t = tree_cons (NULL_TREE, double_type_node, end_params_node);
 180   double_ftype_double = build_function_type (double_type_node, t);
 181   t = tree_cons (NULL_TREE, double_type_node, t);
 182   double_ftype_double_double = build_function_type (double_type_node, t);
 183
 184   define_builtin (BUILT_IN_FMOD, "__builtin_fmod",
 185                   double_ftype_double_double, "fmod");
 186   define_builtin (BUILT_IN_FMODF, "__builtin_fmodf",
 187                   float_ftype_float_float, "fmodf");
 188
 189   define_builtin (BUILT_IN_ATAN, "__builtin_atan",
 190                   double_ftype_double, "_ZN4java4lang4Math4atanEd");
 191   define_builtin (BUILT_IN_ATAN2, "__builtin_atan2",
 192                   double_ftype_double_double, "_ZN4java4lang4Math5atan2Edd");
 193   define_builtin (BUILT_IN_COS, "__builtin_cos",
 194                   double_ftype_double, "_ZN4java4lang4Math3cosEd");
 195   define_builtin (BUILT_IN_EXP, "__builtin_exp",
 196                   double_ftype_double, "_ZN4java4lang4Math3expEd");
 197   define_builtin (BUILT_IN_LOG, "__builtin_log",
 198                   double_ftype_double, "_ZN4java4lang4Math3logEd");
 199   define_builtin (BUILT_IN_POW, "__builtin_pow",
 200                   double_ftype_double_double, "_ZN4java4lang4Math3powEdd");
 201   define_builtin (BUILT_IN_SIN, "__builtin_sin",
 202                   double_ftype_double, "_ZN4java4lang4Math3sinEd");
 203   define_builtin (BUILT_IN_SQRT, "__builtin_sqrt",
 204                   double_ftype_double, "_ZN4java4lang4Math4sqrtEd");
 205   define_builtin (BUILT_IN_TAN, "__builtin_tan",
 206                   double_ftype_double, "_ZN4java4lang4Math3tanEd");
 207 }
 208
 209 /* If the call matches a builtin, return the
 210    appropriate builtin expression instead.  */
 211 tree
 212 check_for_builtin (tree method, tree call)
 213 {
 214   if (! flag_emit_class_files && optimize && TREE_CODE (call) == CALL_EXPR)
 215     {
 216       int i;
 217       tree method_arguments = TREE_OPERAND (call, 1);
 218       tree method_class = DECL_NAME (TYPE_NAME (DECL_CONTEXT (method)));
 219       tree method_name = DECL_NAME (method);
 220       tree method_return_type = TREE_TYPE (TREE_TYPE (method));
 221
 222       for (i = 0; java_builtins[i].builtin_code != END_BUILTINS; ++i)
 223         {
 224           if (method_class == java_builtins[i].class_name.t
 225               && method_name == java_builtins[i].method_name.t)
 226             {
 227               tree fn;
 228
 229               if (java_builtins[i].creator != NULL)
 230                 return (*java_builtins[i].creator) (method_return_type,
 231                                                     method_arguments);
 232               fn = built_in_decls[java_builtins[i].builtin_code];
 233               if (fn == NULL_TREE)
 234                 return NULL_TREE;
 235               return java_build_function_call_expr (fn, method_arguments);
 236             }
 237         }
 238     }
 239   return call;
 240 }
 241
 242 #include "gt-java-builtins.h"