1 /*

     2  * Copyright 1997-2006 Sun Microsystems, Inc.  All Rights Reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  *

    23  */

    24 

    25 # include "incls/_precompiled.incl"

    26 # include "incls/_globalDefinitions.cpp.incl"

    27 

    28 

    29 // Basic error support

    30 

    31 void basic_fatal(const char* msg) {

    32   fatal(msg);

    33 }

    34 

    35 

    36 // Something to help porters sleep at night

    37 

    38 void check_basic_types() {

    39 #ifdef ASSERT

    40 #ifdef _LP64

    41   assert(min_intx ==  (intx)CONST64(0x8000000000000000), "correct constant");

    42   assert(max_intx ==  CONST64(0x7FFFFFFFFFFFFFFF), "correct constant");

    43   assert(max_uintx == CONST64(0xFFFFFFFFFFFFFFFF), "correct constant");

    44   assert( 8 == sizeof( intx),      "wrong size for basic type");

    45   assert( 8 == sizeof( jobject),   "wrong size for basic type");

    46 #else

    47   assert(min_intx ==  (intx)0x80000000,  "correct constant");

    48   assert(max_intx ==  0x7FFFFFFF,  "correct constant");

    49   assert(max_uintx == 0xFFFFFFFF,  "correct constant");

    50   assert( 4 == sizeof( intx),      "wrong size for basic type");

    51   assert( 4 == sizeof( jobject),   "wrong size for basic type");

    52 #endif

    53   assert( (~max_juint) == 0,  "max_juint has all its bits");

    54   assert( (~max_uintx) == 0,  "max_uintx has all its bits");

    55   assert( (~max_julong) == 0, "max_julong has all its bits");

    56   assert( 1 == sizeof( jbyte),     "wrong size for basic type");

    57   assert( 2 == sizeof( jchar),     "wrong size for basic type");

    58   assert( 2 == sizeof( jshort),    "wrong size for basic type");

    59   assert( 4 == sizeof( juint),     "wrong size for basic type");

    60   assert( 4 == sizeof( jint),      "wrong size for basic type");

    61   assert( 1 == sizeof( jboolean),  "wrong size for basic type");

    62   assert( 8 == sizeof( jlong),     "wrong size for basic type");

    63   assert( 4 == sizeof( jfloat),    "wrong size for basic type");

    64   assert( 8 == sizeof( jdouble),   "wrong size for basic type");

    65   assert( 1 == sizeof( u1),        "wrong size for basic type");

    66   assert( 2 == sizeof( u2),        "wrong size for basic type");

    67   assert( 4 == sizeof( u4),        "wrong size for basic type");

    68 

    69   int num_type_chars = 0;

    70   for (int i = 0; i < 99; i++) {

    71     if (type2char((BasicType)i) != 0) {

    72       assert(char2type(type2char((BasicType)i)) == i, "proper inverses");

    73       num_type_chars++;

    74     }

    75   }

    76   assert(num_type_chars == 11, "must have tested the right number of mappings");

    77   assert(char2type(0) == T_ILLEGAL, "correct illegality");

    78 

    79   {

    80     for (int i = T_BOOLEAN; i <= T_CONFLICT; i++) {

    81       BasicType vt = (BasicType)i;

    82       BasicType ft = type2field[vt];

    83       switch (vt) {

    84       // the following types might plausibly show up in memory layouts:

    85       case T_BOOLEAN:

    86       case T_BYTE:

    87       case T_CHAR:

    88       case T_SHORT:

    89       case T_INT:

    90       case T_FLOAT:

    91       case T_DOUBLE:

    92       case T_LONG:

    93       case T_OBJECT:

    94       case T_ADDRESS:   // random raw pointer

    95       case T_CONFLICT:  // might as well support a bottom type

    96       case T_VOID:      // padding or other unaddressed word

    97         // layout type must map to itself

    98         assert(vt == ft, "");

    99         break;

   100       default:

   101         // non-layout type must map to a (different) layout type

   102         assert(vt != ft, "");

   103         assert(ft == type2field[ft], "");

   104       }

   105       // every type must map to same-sized layout type:

   106       assert(type2size[vt] == type2size[ft], "");

   107     }

   108   }

   109   // These are assumed, e.g., when filling HeapWords with juints.

   110   assert(is_power_of_2(sizeof(juint)), "juint must be power of 2");

   111   assert(is_power_of_2(HeapWordSize), "HeapWordSize must be power of 2");

   112   assert((size_t)HeapWordSize >= sizeof(juint),

   113          "HeapWord should be at least as large as juint");

   114   assert(sizeof(NULL) == sizeof(char*), "NULL must be same size as pointer");

   115 #endif

   116 

   117   if( JavaPriority1_To_OSPriority != -1 )

   118     os::java_to_os_priority[1] = JavaPriority1_To_OSPriority;

   119   if( JavaPriority2_To_OSPriority != -1 )

   120     os::java_to_os_priority[2] = JavaPriority2_To_OSPriority;

   121   if( JavaPriority3_To_OSPriority != -1 )

   122     os::java_to_os_priority[3] = JavaPriority3_To_OSPriority;

   123   if( JavaPriority4_To_OSPriority != -1 )

   124     os::java_to_os_priority[4] = JavaPriority4_To_OSPriority;

   125   if( JavaPriority5_To_OSPriority != -1 )

   126     os::java_to_os_priority[5] = JavaPriority5_To_OSPriority;

   127   if( JavaPriority6_To_OSPriority != -1 )

   128     os::java_to_os_priority[6] = JavaPriority6_To_OSPriority;

   129   if( JavaPriority7_To_OSPriority != -1 )

   130     os::java_to_os_priority[7] = JavaPriority7_To_OSPriority;

   131   if( JavaPriority8_To_OSPriority != -1 )

   132     os::java_to_os_priority[8] = JavaPriority8_To_OSPriority;

   133   if( JavaPriority9_To_OSPriority != -1 )

   134     os::java_to_os_priority[9] = JavaPriority9_To_OSPriority;

   135   if(JavaPriority10_To_OSPriority != -1 )

   136     os::java_to_os_priority[10] = JavaPriority10_To_OSPriority;

   137 }

   138 

   139 

   140 // Map BasicType to signature character

   141 char type2char_tab[T_CONFLICT+1]={ 0, 0, 0, 0, 'Z', 'C', 'F', 'D', 'B', 'S', 'I', 'J', 'L', '[', 'V', 0, 0};

   142 

   143 // Map BasicType to Java type name

   144 const char* type2name_tab[T_CONFLICT+1] = {

   145   NULL, NULL, NULL, NULL,

   146   "boolean",

   147   "char",

   148   "float",

   149   "double",

   150   "byte",

   151   "short",

   152   "int",

   153   "long",

   154   "object",

   155   "array",

   156   "void",

   157   "*address*",

   158   "*conflict*"

   159 };

   160 

   161 

   162 BasicType name2type(const char* name) {

   163   for (int i = T_BOOLEAN; i <= T_VOID; i++) {

   164     BasicType t = (BasicType)i;

   165     if (type2name_tab[t] != NULL && 0 == strcmp(type2name_tab[t], name))

   166       return t;

   167   }

   168   return T_ILLEGAL;

   169 }

   170 

   171 

   172 // Map BasicType to size in words

   173 int type2size[T_CONFLICT+1]={ -1, 0, 0, 0, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 0, 1, -1};

   174 

   175 BasicType type2field[T_CONFLICT+1] = {

   176   (BasicType)0,            // 0,

   177   (BasicType)0,            // 1,

   178   (BasicType)0,            // 2,

   179   (BasicType)0,            // 3,

   180   T_BOOLEAN,               // T_BOOLEAN  =  4,

   181   T_CHAR,                  // T_CHAR     =  5,

   182   T_FLOAT,                 // T_FLOAT    =  6,

   183   T_DOUBLE,                // T_DOUBLE   =  7,

   184   T_BYTE,                  // T_BYTE     =  8,

   185   T_SHORT,                 // T_SHORT    =  9,

   186   T_INT,                   // T_INT      = 10,

   187   T_LONG,                  // T_LONG     = 11,

   188   T_OBJECT,                // T_OBJECT   = 12,

   189   T_OBJECT,                // T_ARRAY    = 13,

   190   T_VOID,                  // T_VOID     = 14,

   191   T_ADDRESS,               // T_ADDRESS  = 15,

   192   T_CONFLICT               // T_CONFLICT = 16,

   193 };

   194 

   195 

   196 BasicType type2wfield[T_CONFLICT+1] = {

   197   (BasicType)0,            // 0,

   198   (BasicType)0,            // 1,

   199   (BasicType)0,            // 2,

   200   (BasicType)0,            // 3,

   201   T_INT,     // T_BOOLEAN  =  4,

   202   T_INT,     // T_CHAR     =  5,

   203   T_FLOAT,   // T_FLOAT    =  6,

   204   T_DOUBLE,  // T_DOUBLE   =  7,

   205   T_INT,     // T_BYTE     =  8,

   206   T_INT,     // T_SHORT    =  9,

   207   T_INT,     // T_INT      = 10,

   208   T_LONG,    // T_LONG     = 11,

   209   T_OBJECT,  // T_OBJECT   = 12,

   210   T_OBJECT,  // T_ARRAY    = 13,

   211   T_VOID,    // T_VOID     = 14,

   212   T_ADDRESS, // T_ADDRESS  = 15,

   213   T_CONFLICT // T_CONFLICT = 16,

   214 };

   215 

   216 

   217 int type2aelembytes[T_CONFLICT+1] = {

   218   0,                      // 0

   219   0,                      // 1

   220   0,                      // 2

   221   0,                      // 3

   222   T_BOOLEAN_aelem_bytes,  // T_BOOLEAN  =  4,

   223   T_CHAR_aelem_bytes,     // T_CHAR     =  5,

   224   T_FLOAT_aelem_bytes,    // T_FLOAT    =  6,

   225   T_DOUBLE_aelem_bytes,   // T_DOUBLE   =  7,

   226   T_BYTE_aelem_bytes,     // T_BYTE     =  8,

   227   T_SHORT_aelem_bytes,    // T_SHORT    =  9,

   228   T_INT_aelem_bytes,      // T_INT      = 10,

   229   T_LONG_aelem_bytes,     // T_LONG     = 11,

   230   T_OBJECT_aelem_bytes,   // T_OBJECT   = 12,

   231   T_ARRAY_aelem_bytes,    // T_ARRAY    = 13,

   232   0,                      // T_VOID     = 14,

   233   T_INT_aelem_bytes,      // T_ADDRESS  = 15,

   234   0                       // T_CONFLICT = 16,

   235 };

   236 

   237 

   238 // Support for 64-bit integer arithmetic

   239 

   240 // The following code is mostly taken from JVM typedefs_md.h and system_md.c

   241 

   242 static const jlong  high_bit  = (jlong)1 << (jlong)63;

   243 static const jlong other_bits = ~high_bit;

   244 

   245 jlong float2long(jfloat f) {

   246   jlong tmp = (jlong) f;

   247   if (tmp != high_bit) {

   248     return tmp;

   249   } else {

   250     if (g_isnan((jdouble)f)) {

   251       return 0;

   252     }

   253     if (f < 0) {

   254       return high_bit;

   255     } else {

   256       return other_bits;

   257     }

   258   }

   259 }

   260 

   261 

   262 jlong double2long(jdouble f) {

   263   jlong tmp = (jlong) f;

   264   if (tmp != high_bit) {

   265     return tmp;

   266   } else {

   267     if (g_isnan(f)) {

   268       return 0;

   269     }

   270     if (f < 0) {

   271       return high_bit;

   272     } else {

   273       return other_bits;

   274     }

   275   }

   276 }

   277 

   278 // least common multiple

   279 size_t lcm(size_t a, size_t b) {

   280     size_t cur, div, next;

   281 

   282     cur = MAX2(a, b);

   283     div = MIN2(a, b);

   284 

   285     assert(div != 0, "lcm requires positive arguments");

   286 

   287 

   288     while ((next = cur % div) != 0) {

   289         cur = div; div = next;

   290     }

   291 

   292 

   293     julong result = julong(a) * b / div;

   294     assert(result <= (size_t)max_uintx, "Integer overflow in lcm");

   295 

   296     return size_t(result);

   297 }