/*

 * Copyright (c) 1997, 2016, 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.

 *

 */

#include "precompiled.hpp"

#include "runtime/os.hpp"

#include "utilities/globalDefinitions.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("%s", 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");

  assert(wordSize == BytesPerWord, "should be the same since they're used interchangeably");

  assert(wordSize == HeapWordSize, "should be the same since they're also used interchangeably");

  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_NARROWKLASS: // compressed klass 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, 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*",

  "*narrowklass*",

  "*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, 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_NARROWKLASS,           // T_NARROWKLASS = 18,

  T_CONFLICT               // T_CONFLICT = 19,

};

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_NARROWKLASS, // T_NARROWKLASS  = 18,

  T_CONFLICT // T_CONFLICT = 19,

};

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,

  T_NARROWKLASS_aelem_bytes, // T_NARROWKLASS= 18,

  0                          // T_CONFLICT = 19,

};

#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);

}

// Test that nth_bit macro and friends behave as

// expected, even with low-precedence operators.

STATIC_ASSERT(nth_bit(3)   == 0x8);

STATIC_ASSERT(nth_bit(1|2) == 0x8);

STATIC_ASSERT(right_n_bits(3)   == 0x7);

STATIC_ASSERT(right_n_bits(1|2) == 0x7);

STATIC_ASSERT(left_n_bits(3)   == (intptr_t) LP64_ONLY(0xE000000000000000) NOT_LP64(0xE0000000));

STATIC_ASSERT(left_n_bits(1|2) == (intptr_t) LP64_ONLY(0xE000000000000000) NOT_LP64(0xE0000000));