gcc/java/javaop.h

   1 /* Utility macros to handle Java(TM) byte codes.
   2
   3    Copyright (C) 1996, 1998, 1999, 2003 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 2, 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 COPYING.  If not, write to
  19 the Free Software Foundation, 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.
  21
  22 Java and all Java-based marks are trademarks or registered trademarks
  23 of Sun Microsystems, Inc. in the United States and other countries.
  24 The Free Software Foundation is independent of Sun Microsystems, Inc.  */
  25
  26 /* Written by Per Bothner <bothner@cygnus.com>, February 1996. */
  27
  28 #ifndef GCC_JAVAOP_H
  29 #define GCC_JAVAOP_H
  30
  31 typedef unsigned char   uint8;
  32 #ifndef int16
  33 #define int16 short
  34 #endif
  35 typedef unsigned int16  uint16;
  36
  37 #ifndef int32
  38 #define int32 long
  39 #endif
  40 typedef unsigned int32  uint32;
  41
  42 /* A signed 64-bit (or more) integral type, suitable for Java's 'long'.  */
  43 #ifndef int64
  44 #define int64 long long
  45 #endif
  46 /* An unsigned 64-bit (or more) integral type, same length as int64. */
  47 #ifndef uint64
  48 #define uint64 unsigned int64
  49 #endif
  50
  51 typedef uint16                  jchar;
  52 typedef signed char             jbyte;
  53 typedef int16                   jshort;
  54 typedef int32                   jint;
  55 typedef int64                   jlong;
  56 typedef void*                   jref;
  57
  58 /* A 32-bit big-endian IEEE single-precision float. */
  59 typedef struct _jfloat {
  60   unsigned int negative : 1;
  61   unsigned int exponent : 8;
  62   unsigned int mantissa : 23;
  63 } jfloat;
  64 #define JFLOAT_FINITE(f) ((f).exponent != 0xFF)
  65 #define JFLOAT_QNAN_MASK 0x400000
  66 #define JFLOAT_EXP_BIAS 0x7f
  67
  68 /* A 32-bit big-endian IEEE double-precision float. */
  69 typedef struct _jdouble {
  70   unsigned int negative : 1;
  71   unsigned int exponent : 11;
  72   unsigned int mantissa0: 20;
  73   unsigned int mantissa1: 32;
  74 } jdouble;
  75 #define JDOUBLE_FINITE(f) ((f).exponent != 0x7FF)
  76 #define JDOUBLE_QNAN_MASK 0x80000  /* apply to mantissa0 */
  77 #define JDOUBLE_EXP_BIAS 0x3ff
  78
  79 /* A jword is an unsigned integral type big enough for a 32-bit jint
  80    or jfloat *or* a pointer.  It is the type appropriate for stack
  81    locations and local variables in a Java interpreter. */
  82
  83
  84 #ifndef jword
  85 #define jword uint32
  86 #endif
  87
  88 #ifndef IMMEDIATE_u1
  89 #define IMMEDIATE_u1 (PC++, CHECK_PC_IN_RANGE(PC), BCODE[PC-1])
  90 #endif
  91 #ifndef IMMEDIATE_s1
  92 #define IMMEDIATE_s1 (PC++, CHECK_PC_IN_RANGE(PC), (signed char)BCODE[PC-1])
  93 #endif
  94 #ifndef IMMEDIATE_s2
  95 #define IMMEDIATE_s2 (PC+=2, CHECK_PC_IN_RANGE(PC), \
  96   (signed char) BCODE[PC-2] * 256 + BCODE[PC-1])
  97 #endif
  98 #ifndef IMMEDIATE_u2
  99 #define IMMEDIATE_u2 (PC+=2, CHECK_PC_IN_RANGE(PC),\
 100   (BCODE[PC-2] * 256 + BCODE[PC-1]))
 101 #endif
 102 #ifndef IMMEDIATE_s4
 103 #define IMMEDIATE_s4 (PC+=4, CHECK_PC_IN_RANGE(PC), \
 104   (WORD_TO_INT((BCODE[PC-4] << 24) | (BCODE[PC-3] << 16) \
 105          | (BCODE[PC-2] << 8) | (BCODE[PC-1]))))
 106 #endif
 107
 108 static inline jfloat
 109 WORD_TO_FLOAT(jword w)
 110 {
 111   jfloat f;
 112
 113   f.negative = (w & 0x80000000) >> 31;
 114   f.exponent = (w & 0x7f800000) >> 23;
 115   f.mantissa = (w & 0x007fffff);
 116
 117   return f;
 118 }
 119
 120 /* Sign extend w.  If the host on which this cross-compiler runs uses
 121    a 64-bit type for jword the appropriate sign extension is
 122    performed; if it's a 32-bit type the arithmetic does nothing but is
 123    harmless.  */
 124 static inline jint
 125 WORD_TO_INT(jword w)
 126 {
 127   jint n = w & 0xffffffff; /* Mask lower 32 bits.  */
 128   n ^= (jint)1 << 31;
 129   n -= (jint)1 << 31; /* Sign extend lower 32 bits to upper.  */
 130   return n;
 131 }
 132
 133 static inline jlong
 134 WORDS_TO_LONG(jword hi, jword lo)
 135 {
 136   return ((jlong) hi << 32) | ((jlong)lo & (((jlong)1 << 32) -1));
 137 }
 138
 139 static inline jdouble
 140 WORDS_TO_DOUBLE(jword hi, jword lo)
 141 {
 142   jdouble d;
 143
 144   d.negative  = (hi & 0x80000000) >> 31;
 145   d.exponent  = (hi & 0x7ff00000) >> 20;
 146   d.mantissa0 = (hi & 0x000fffff);
 147   d.mantissa1 = lo;
 148
 149   return d;
 150 }
 151
 152 /* If PREFIX_CHAR is the first character of the Utf8 encoding of a character,
 153    return the number of bytes taken by the encoding.
 154    Return -1 for a continuation character.  */
 155 #define UT8_CHAR_LENGTH(PREFIX_CHAR) \
 156   ((unsigned char)(PREFIX_CHAR) < 128 ? 1 \
 157    : ((PREFIX_CHAR) & 0x40) == 0 ? -1 \
 158    : ((PREFIX_CHAR) & 0x20) == 0 ? 2 \
 159    : ((PREFIX_CHAR) & 0x10) == 0 ? 3 \
 160    : ((PREFIX_CHAR) & 0x08) == 0 ? 4 : 5)
 161
 162 #endif /* ! GCC_JAVAOP_H */