gcc/java/javaop.h

   1 /* Utility macros to handle Java(TM) byte codes.
   2
   3    Copyright (C) 1996, 1998, 1999  Free Software Foundation, Inc.
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU General Public License as published by
   7 the Free Software Foundation; either version 2, or (at your option)
   8 any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with GNU CC; see the file COPYING.  If not, write to
  17 the Free Software Foundation, 59 Temple Place - Suite 330,
  18 Boston, MA 02111-1307, USA.
  19
  20 Java and all Java-based marks are trademarks or registered trademarks
  21 of Sun Microsystems, Inc. in the United States and other countries.
  22 The Free Software Foundation is independent of Sun Microsystems, Inc.  */
  23
  24 /* Written by Per Bothner <bothner@cygnus.com>, February 1996. */
  25
  26 #ifndef JAVAOP_H
  27 #define JAVAOP_H
  28
  29 typedef unsigned char   uint8;
  30 #ifndef int16
  31 #define int16 short
  32 #endif
  33 typedef unsigned int16  uint16;
  34
  35 #ifndef int32
  36 #define int32 long
  37 #endif
  38 typedef unsigned int32  uint32;
  39
  40 /* A signed 64-bit (or more) integral type, suiteable for Java's 'long'. */
  41 #ifndef int64
  42 #define int64 long long
  43 #endif
  44 /* An unsigned 64-bit (or more) integral type, same length as int64. */
  45 #ifndef uint64
  46 #define uint64 unsigned int64
  47 #endif
  48
  49 typedef uint16                  jchar;
  50 #ifdef __STDC__
  51 typedef signed char             jbyte;
  52 #else
  53 typedef char                    jbyte;
  54 #endif
  55 typedef int16                   jshort;
  56 typedef int32                   jint;
  57 typedef int64                   jlong;
  58 typedef void*                   jref;
  59
  60 /* A 32-bit IEEE single-precision float. */
  61 #ifndef jfloat
  62 #define jfloat float
  63 #endif
  64
  65 /* A 32-bit IEEE double-precision float. */
  66 #ifndef jdouble
  67 #define jdouble double
  68 #endif
  69
  70 union Word {
  71   jint i;
  72   jfloat f;
  73   void *p;
  74 };
  75
  76 /* A jword is an unsigned integral type big enough for a 32-bit jint
  77    or jfloat *or* a pointer.  It is the type appropriate for stack
  78    locations and local variables in a Java interpreter. */
  79
  80
  81 #ifndef jword
  82 #define jword uint32
  83 #endif
  84
  85 #ifndef IMMEDIATE_u1
  86 #define IMMEDIATE_u1 (PC++, CHECK_PC_IN_RANGE(PC), BCODE[PC-1])
  87 #endif
  88 #ifndef IMMEDIATE_s1
  89 #define IMMEDIATE_s1 (PC++, CHECK_PC_IN_RANGE(PC), (signed char)BCODE[PC-1])
  90 #endif
  91 #ifndef IMMEDIATE_s2
  92 #define IMMEDIATE_s2 (PC+=2, CHECK_PC_IN_RANGE(PC), \
  93   (signed char) BCODE[PC-2] * 256 + BCODE[PC-1])
  94 #endif
  95 #ifndef IMMEDIATE_u2
  96 #define IMMEDIATE_u2 (PC+=2, CHECK_PC_IN_RANGE(PC),\
  97   (BCODE[PC-2] * 256 + BCODE[PC-1]))
  98 #endif
  99 #ifndef IMMEDIATE_s4
 100 #define IMMEDIATE_s4 (PC+=4, CHECK_PC_IN_RANGE(PC), \
 101   (WORD_TO_INT((BCODE[PC-4] << 24) | (BCODE[PC-3] << 16) \
 102          | (BCODE[PC-2] << 8) | (BCODE[PC-1]))))
 103 #endif
 104
 105 static inline jfloat
 106 WORD_TO_FLOAT(jword w)
 107 { union Word wu;
 108   wu.i = w;
 109   return wu.f;
 110 }
 111
 112 /* Sign extend w.  If the host on which this cross-compiler runs uses
 113    a 64-bit type for jword the appropriate sign extension is
 114    performed; if it's a 32-bit type the arithmetic does nothing but is
 115    harmless.  */
 116 static inline jint
 117 WORD_TO_INT(jword w)
 118 {
 119   jint n = w & 0xffffffff; /* Mask lower 32 bits.  */
 120   n ^= (jint)1 << 31;
 121   n -= (jint)1 << 31; /* Sign extend lower 32 bits to upper.  */
 122   return n;
 123 }
 124
 125 static inline jlong
 126 WORDS_TO_LONG(jword hi, jword lo)
 127 {
 128   return ((jlong) hi << 32) | ((jlong)lo & (((jlong)1 << 32) -1));
 129 }
 130
 131 union DWord {
 132   jdouble d;
 133   jlong l;
 134   jword w[2];
 135 };
 136
 137 static inline jdouble
 138 WORDS_TO_DOUBLE(jword hi, jword lo)
 139 { union DWord wu;
 140 #if (1 == HOST_FLOAT_WORDS_BIG_ENDIAN)
 141   wu.l = WORDS_TO_LONG(lo, hi);
 142 #else
 143   wu.l = WORDS_TO_LONG(hi, lo);
 144 #endif
 145   return wu.d;
 146 }
 147
 148 /* If PREFIX_CHAR is the first character of the Utf8 encoding of a character,
 149    return the number of bytes taken by the encoding.
 150    Return -1 for a continuation character.  */
 151 #define UT8_CHAR_LENGTH(PREFIX_CHAR) \
 152   ((unsigned char)(PREFIX_CHAR) < 128 ? 1 \
 153    : ((PREFIX_CHAR) & 0x40) == 0 ? -1 \
 154    : ((PREFIX_CHAR) & 0x20) == 0 ? 2 \
 155    : ((PREFIX_CHAR) & 0x10) == 0 ? 3 \
 156    : ((PREFIX_CHAR) & 0x08) == 0 ? 4 : 5)
 157
 158 #endif /* !JAVAOP_H */