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 /*

  * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.

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

  *

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

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

  * published by the Free Software Foundation.

  *

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

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

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

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

  * accompanied this code).

  *

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

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

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

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

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  */

 #include "precompiled.hpp"

 #include "runtime/os.hpp"

 #include "utilities/globalDefinitions.hpp"

 #include "utilities/top.hpp"

 // Basic error support

 // Info for oops within a java object.  Defaults are zero so

 // things will break badly if incorrectly initialized.

 int heapOopSize        = 0;

 int LogBytesPerHeapOop = 0;

 int LogBitsPerHeapOop  = 0;

 int BytesPerHeapOop    = 0;

 int BitsPerHeapOop     = 0;

 // Object alignment, in units of HeapWords.

 // Defaults are -1 so things will break badly if incorrectly initialized.

 int MinObjAlignment            = -1;

 int MinObjAlignmentInBytes     = -1;

 int MinObjAlignmentInBytesMask = 0;

 int LogMinObjAlignment         = -1;

 int LogMinObjAlignmentInBytes  = -1;

 // Oop encoding heap max

 uint64_t OopEncodingHeapMax = 0;

 void basic_fatal(const char* msg) {

   fatal(msg);

 }

 // Something to help porters sleep at night

 void basic_types_init() {

 #ifdef ASSERT

 #ifdef _LP64

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

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

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

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

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

 #else

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

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

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

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

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

 #endif

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

   int num_type_chars = 0;

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

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

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

       num_type_chars++;

     }

   }

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

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

   {

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

       BasicType vt = (BasicType)i;

       BasicType ft = type2field[vt];

       switch (vt) {

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

       case T_BOOLEAN:

       case T_BYTE:

       case T_CHAR:

       case T_SHORT:

       case T_INT:

       case T_FLOAT:

       case T_DOUBLE:

       case T_LONG:

       case T_OBJECT:

       case T_ADDRESS:   // random raw pointer

       case T_METADATA:  // metadata pointer

       case T_NARROWOOP: // compressed pointer

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

       case T_VOID:      // padding or other unaddressed word

         // layout type must map to itself

         assert(vt == ft, "");

         break;

       default:

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

         assert(vt != ft, "");

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

       }

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

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

     }

   }

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

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

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

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

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

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

 #endif

   if( JavaPriority1_To_OSPriority != -1 )

     os::java_to_os_priority[1] = JavaPriority1_To_OSPriority;

   if( JavaPriority2_To_OSPriority != -1 )

     os::java_to_os_priority[2] = JavaPriority2_To_OSPriority;

   if( JavaPriority3_To_OSPriority != -1 )

     os::java_to_os_priority[3] = JavaPriority3_To_OSPriority;

   if( JavaPriority4_To_OSPriority != -1 )

     os::java_to_os_priority[4] = JavaPriority4_To_OSPriority;

   if( JavaPriority5_To_OSPriority != -1 )

     os::java_to_os_priority[5] = JavaPriority5_To_OSPriority;

   if( JavaPriority6_To_OSPriority != -1 )

     os::java_to_os_priority[6] = JavaPriority6_To_OSPriority;

   if( JavaPriority7_To_OSPriority != -1 )

     os::java_to_os_priority[7] = JavaPriority7_To_OSPriority;

   if( JavaPriority8_To_OSPriority != -1 )

     os::java_to_os_priority[8] = JavaPriority8_To_OSPriority;

   if( JavaPriority9_To_OSPriority != -1 )

     os::java_to_os_priority[9] = JavaPriority9_To_OSPriority;

   if(JavaPriority10_To_OSPriority != -1 )

     os::java_to_os_priority[10] = JavaPriority10_To_OSPriority;

   // Set the size of basic types here (after argument parsing but before

   // stub generation).

   if (UseCompressedOops) {

     // Size info for oops within java objects is fixed

     heapOopSize        = jintSize;

     LogBytesPerHeapOop = LogBytesPerInt;

     LogBitsPerHeapOop  = LogBitsPerInt;

     BytesPerHeapOop    = BytesPerInt;

     BitsPerHeapOop     = BitsPerInt;

   } else {

     heapOopSize        = oopSize;

     LogBytesPerHeapOop = LogBytesPerWord;

     LogBitsPerHeapOop  = LogBitsPerWord;

     BytesPerHeapOop    = BytesPerWord;

     BitsPerHeapOop     = BitsPerWord;

   }

   _type2aelembytes[T_OBJECT] = heapOopSize;

   _type2aelembytes[T_ARRAY]  = heapOopSize;

 }

 // Map BasicType to signature character

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

 // Map BasicType to Java type name

 const char* type2name_tab[T_CONFLICT+1] = {

   NULL, NULL, NULL, NULL,

   "boolean",

   "char",

   "float",

   "double",

   "byte",

   "short",

   "int",

   "long",

   "object",

   "array",

   "void",

   "*address*",

   "*narrowoop*",

   "*metadata*",

   "*conflict*"

 };

 BasicType name2type(const char* name) {

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

     BasicType t = (BasicType)i;

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

       return t;

   }

   return T_ILLEGAL;

 }

 // Map BasicType to size in words

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

 BasicType type2field[T_CONFLICT+1] = {

   (BasicType)0,            // 0,

   (BasicType)0,            // 1,

   (BasicType)0,            // 2,

   (BasicType)0,            // 3,

   T_BOOLEAN,               // T_BOOLEAN  =  4,

   T_CHAR,                  // T_CHAR     =  5,

   T_FLOAT,                 // T_FLOAT    =  6,

   T_DOUBLE,                // T_DOUBLE   =  7,

   T_BYTE,                  // T_BYTE     =  8,

   T_SHORT,                 // T_SHORT    =  9,

   T_INT,                   // T_INT      = 10,

   T_LONG,                  // T_LONG     = 11,

   T_OBJECT,                // T_OBJECT   = 12,

   T_OBJECT,                // T_ARRAY    = 13,

   T_VOID,                  // T_VOID     = 14,

   T_ADDRESS,               // T_ADDRESS  = 15,

   T_NARROWOOP,             // T_NARROWOOP= 16,

   T_METADATA,              // T_METADATA = 17,

   T_CONFLICT               // T_CONFLICT = 18,

 };

 BasicType type2wfield[T_CONFLICT+1] = {

   (BasicType)0,            // 0,

   (BasicType)0,            // 1,

   (BasicType)0,            // 2,

   (BasicType)0,            // 3,

   T_INT,     // T_BOOLEAN  =  4,

   T_INT,     // T_CHAR     =  5,

   T_FLOAT,   // T_FLOAT    =  6,

   T_DOUBLE,  // T_DOUBLE   =  7,

   T_INT,     // T_BYTE     =  8,

   T_INT,     // T_SHORT    =  9,

   T_INT,     // T_INT      = 10,

   T_LONG,    // T_LONG     = 11,

   T_OBJECT,  // T_OBJECT   = 12,

   T_OBJECT,  // T_ARRAY    = 13,

   T_VOID,    // T_VOID     = 14,

   T_ADDRESS, // T_ADDRESS  = 15,

   T_NARROWOOP, // T_NARROWOOP  = 16,

   T_METADATA,  // T_METADATA   = 17,

   T_CONFLICT // T_CONFLICT = 18,

 };

 int _type2aelembytes[T_CONFLICT+1] = {

   0,                      // 0

   0,                      // 1

   0,                      // 2

   0,                      // 3

   T_BOOLEAN_aelem_bytes,  // T_BOOLEAN  =  4,

   T_CHAR_aelem_bytes,     // T_CHAR     =  5,

   T_FLOAT_aelem_bytes,    // T_FLOAT    =  6,

   T_DOUBLE_aelem_bytes,   // T_DOUBLE   =  7,

   T_BYTE_aelem_bytes,     // T_BYTE     =  8,

   T_SHORT_aelem_bytes,    // T_SHORT    =  9,

   T_INT_aelem_bytes,      // T_INT      = 10,

   T_LONG_aelem_bytes,     // T_LONG     = 11,

   T_OBJECT_aelem_bytes,   // T_OBJECT   = 12,

   T_ARRAY_aelem_bytes,    // T_ARRAY    = 13,

   0,                      // T_VOID     = 14,

   T_OBJECT_aelem_bytes,   // T_ADDRESS  = 15,

   T_NARROWOOP_aelem_bytes,// T_NARROWOOP= 16,

   T_OBJECT_aelem_bytes,   // T_METADATA = 17,

   0                       // T_CONFLICT = 18,

 };

 #ifdef ASSERT

 int type2aelembytes(BasicType t, bool allow_address) {

   assert(allow_address || t != T_ADDRESS, " ");

   return _type2aelembytes[t];

 }

 #endif

 // Support for 64-bit integer arithmetic

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

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

 static const jlong other_bits = ~high_bit;

 jlong float2long(jfloat f) {

   jlong tmp = (jlong) f;

   if (tmp != high_bit) {

     return tmp;

   } else {

     if (g_isnan((jdouble)f)) {

       return 0;

     }

     if (f < 0) {

       return high_bit;

     } else {

       return other_bits;

     }

   }

 }

 jlong double2long(jdouble f) {

   jlong tmp = (jlong) f;

   if (tmp != high_bit) {

     return tmp;

   } else {

     if (g_isnan(f)) {

       return 0;

     }

     if (f < 0) {

       return high_bit;

     } else {

       return other_bits;

     }

   }

 }

 // least common multiple

 size_t lcm(size_t a, size_t b) {

     size_t cur, div, next;

     cur = MAX2(a, b);

     div = MIN2(a, b);

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

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

         cur = div; div = next;

     }

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

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

     return size_t(result);

 }