gcc/java/javaop.h

   1 /* Utility macros to handle Java(TM) byte codes.
   2
   3    Copyright (C) 1996, 1998, 1999, 2003, 2007 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 3, 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 COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.
  20
  21 Java and all Java-based marks are trademarks or registered trademarks
  22 of Sun Microsystems, Inc. in the United States and other countries.
  23 The Free Software Foundation is independent of Sun Microsystems, Inc.  */
  24
  25 /* Written by Per Bothner <bothner@cygnus.com>, February 1996. */
  26
  27 #ifndef GCC_JAVAOP_H
  28 #define GCC_JAVAOP_H
  29
  30 typedef unsigned char   uint8;
  31 #ifndef int16
  32 #if __SHRT_MAX__ == 32767
  33 #define int16 short
  34 #elif __INT_MAX__ == 32767
  35 #define int16 int
  36 #elif __LONG_MAX__ == 32767
  37 #define int16 long
  38 #else
  39 #define int16 short
  40 #endif
  41 #endif
  42 typedef unsigned int16  uint16;
  43
  44 #ifndef int32
  45 #if __INT_MAX__ == 2147483647
  46 #define int32 int
  47 #elif __LONG_MAX__ == 2147483647
  48 #define int32 long
  49 #elif __SHRT_MAX__ == 2147483647
  50 #define int32 short
  51 #else
  52 #define int32 int
  53 #endif
  54 #endif
  55 typedef unsigned int32  uint32;
  56
  57 /* A signed 64-bit (or more) integral type, suitable for Java's 'long'.  */
  58 #ifndef int64
  59 #if __LONG_MAX__ == 9223372036854775807LL
  60 #define int64 long
  61 #elif __LONG_LONG_MAX__ == 9223372036854775807LL
  62 #define int64 long long
  63 #else
  64 #define int64 long long
  65 #endif
  66 #endif
  67 /* An unsigned 64-bit (or more) integral type, same length as int64. */
  68 #ifndef uint64
  69 #define uint64 unsigned int64
  70 #endif
  71
  72 typedef uint16                  jchar;
  73 typedef signed char             jbyte;
  74 typedef int16                   jshort;
  75 typedef int32                   jint;
  76 typedef int64                   jlong;
  77 typedef void*                   jref;
  78
  79 /* A 32-bit big-endian IEEE single-precision float. */
  80 typedef struct _jfloat {
  81   unsigned int negative : 1;
  82   unsigned int exponent : 8;
  83   unsigned int mantissa : 23;
  84 } jfloat;
  85 #define JFLOAT_FINITE(f) ((f).exponent != 0xFF)
  86 #define JFLOAT_QNAN_MASK 0x400000
  87 #define JFLOAT_EXP_BIAS 0x7f
  88
  89 /* A 32-bit big-endian IEEE double-precision float. */
  90 typedef struct _jdouble {
  91   unsigned int negative : 1;
  92   unsigned int exponent : 11;
  93   unsigned int mantissa0: 20;
  94   unsigned int mantissa1: 32;
  95 } jdouble;
  96 #define JDOUBLE_FINITE(f) ((f).exponent != 0x7FF)
  97 #define JDOUBLE_QNAN_MASK 0x80000  /* apply to mantissa0 */
  98 #define JDOUBLE_EXP_BIAS 0x3ff
  99
 100 /* A jword is an unsigned integral type big enough for a 32-bit jint
 101    or jfloat *or* a pointer.  It is the type appropriate for stack
 102    locations and local variables in a Java interpreter. */
 103
 104
 105 #ifndef jword
 106 #if defined (__LP64__) || defined (__alpha__) || defined (__MMIX__) \
 107     || (defined (_ARCH_PPC) && defined (__64BIT__)) \
 108     || defined (__powerpc64__) || defined (__s390x__) || defined (__x86_64__) \
 109     || defined (__sparcv9) || (defined (__sparc__) && defined (__arch64__))
 110 #define jword uint64
 111 #else
 112 #define jword uint32
 113 #endif
 114 #endif
 115
 116 #ifndef IMMEDIATE_u1
 117 #define IMMEDIATE_u1 (PC++, CHECK_PC_IN_RANGE(PC), BCODE[PC-1])
 118 #endif
 119 #ifndef IMMEDIATE_s1
 120 #define IMMEDIATE_s1 (PC++, CHECK_PC_IN_RANGE(PC), (signed char)BCODE[PC-1])
 121 #endif
 122 #ifndef IMMEDIATE_s2
 123 #define IMMEDIATE_s2 (PC+=2, CHECK_PC_IN_RANGE(PC), \
 124   (signed char) BCODE[PC-2] * 256 + BCODE[PC-1])
 125 #endif
 126 #ifndef IMMEDIATE_u2
 127 #define IMMEDIATE_u2 (PC+=2, CHECK_PC_IN_RANGE(PC),\
 128   (BCODE[PC-2] * 256 + BCODE[PC-1]))
 129 #endif
 130 #ifndef IMMEDIATE_s4
 131 #define IMMEDIATE_s4 (PC+=4, CHECK_PC_IN_RANGE(PC), \
 132   (WORD_TO_INT((BCODE[PC-4] << 24) | (BCODE[PC-3] << 16) \
 133          | (BCODE[PC-2] << 8) | (BCODE[PC-1]))))
 134 #endif
 135
 136 static inline jfloat
 137 WORD_TO_FLOAT(jword w)
 138 {
 139   jfloat f;
 140
 141   f.negative = (w & 0x80000000) >> 31;
 142   f.exponent = (w & 0x7f800000) >> 23;
 143   f.mantissa = (w & 0x007fffff);
 144
 145   return f;
 146 }
 147
 148 /* Sign extend w.  If the host on which this cross-compiler runs uses
 149    a 64-bit type for jword the appropriate sign extension is
 150    performed; if it's a 32-bit type the arithmetic does nothing but is
 151    harmless.  */
 152 static inline jint
 153 WORD_TO_INT(jword w)
 154 {
 155   jint n = w & 0xffffffff; /* Mask lower 32 bits.  */
 156   n ^= (jint)1 << 31;
 157   n -= (jint)1 << 31; /* Sign extend lower 32 bits to upper.  */
 158   return n;
 159 }
 160
 161 static inline jlong
 162 WORDS_TO_LONG(jword hi, jword lo)
 163 {
 164   return ((jlong) hi << 32) | ((jlong)lo & (((jlong)1 << 32) -1));
 165 }
 166
 167 static inline jdouble
 168 WORDS_TO_DOUBLE(jword hi, jword lo)
 169 {
 170   jdouble d;
 171
 172   d.negative  = (hi & 0x80000000) >> 31;
 173   d.exponent  = (hi & 0x7ff00000) >> 20;
 174   d.mantissa0 = (hi & 0x000fffff);
 175   d.mantissa1 = lo;
 176
 177   return d;
 178 }
 179
 180 /* If PREFIX_CHAR is the first character of the Utf8 encoding of a character,
 181    return the number of bytes taken by the encoding.
 182    Return -1 for a continuation character.  */
 183 #define UT8_CHAR_LENGTH(PREFIX_CHAR) \
 184   ((unsigned char)(PREFIX_CHAR) < 128 ? 1 \
 185    : ((PREFIX_CHAR) & 0x40) == 0 ? -1 \
 186    : ((PREFIX_CHAR) & 0x20) == 0 ? 2 \
 187    : ((PREFIX_CHAR) & 0x10) == 0 ? 3 \
 188    : ((PREFIX_CHAR) & 0x08) == 0 ? 4 : 5)
 189
 190 #endif /* ! GCC_JAVAOP_H */