Java example source code file (Constants.java)
The Constants.java Java example source code/*
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* 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. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* 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.
*
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package com.sun.java.util.jar.pack;
import java.util.Arrays;
import java.util.List;
/**
* Shared constants
* @author John Rose
*/
class Constants {
private Constants(){}
public final static int JAVA_MAGIC = 0xCAFEBABE;
/*
Java Class Version numbers history
1.0 to 1.3.X 45,3
1.4 to 1.4.X 46,0
1.5 to 1.5.X 49,0
1.6 to 1.5.x 50,0
1.7 to 1.6.x 51,0
1.8 to 1.7.x 52,0
*/
public final static Package.Version JAVA_MIN_CLASS_VERSION =
Package.Version.of(45, 03);
public final static Package.Version JAVA5_MAX_CLASS_VERSION =
Package.Version.of(49, 00);
public final static Package.Version JAVA6_MAX_CLASS_VERSION =
Package.Version.of(50, 00);
public final static Package.Version JAVA7_MAX_CLASS_VERSION =
Package.Version.of(51, 00);
public final static Package.Version JAVA8_MAX_CLASS_VERSION =
Package.Version.of(52, 00);
public final static int JAVA_PACKAGE_MAGIC = 0xCAFED00D;
public final static Package.Version JAVA5_PACKAGE_VERSION =
Package.Version.of(150, 7);
public final static Package.Version JAVA6_PACKAGE_VERSION =
Package.Version.of(160, 1);
public final static Package.Version JAVA7_PACKAGE_VERSION =
Package.Version.of(170, 1);
public final static Package.Version JAVA8_PACKAGE_VERSION =
Package.Version.of(171, 0);
// upper limit, should point to the latest class version
public final static Package.Version JAVA_MAX_CLASS_VERSION =
JAVA8_MAX_CLASS_VERSION;
// upper limit should point to the latest package version, for version info!.
public final static Package.Version MAX_PACKAGE_VERSION =
JAVA7_PACKAGE_VERSION;
public final static int CONSTANT_POOL_INDEX_LIMIT = 0x10000;
public final static int CONSTANT_POOL_NARROW_LIMIT = 0x00100;
public final static String JAVA_SIGNATURE_CHARS = "BSCIJFDZLV([";
public final static byte CONSTANT_Utf8 = 1;
public final static byte CONSTANT_unused2 = 2; // unused, was Unicode
public final static byte CONSTANT_Integer = 3;
public final static byte CONSTANT_Float = 4;
public final static byte CONSTANT_Long = 5;
public final static byte CONSTANT_Double = 6;
public final static byte CONSTANT_Class = 7;
public final static byte CONSTANT_String = 8;
public final static byte CONSTANT_Fieldref = 9;
public final static byte CONSTANT_Methodref = 10;
public final static byte CONSTANT_InterfaceMethodref = 11;
public final static byte CONSTANT_NameandType = 12;
public final static byte CONSTANT_unused13 = 13;
public final static byte CONSTANT_unused14 = 14;
public final static byte CONSTANT_MethodHandle = 15;
public final static byte CONSTANT_MethodType = 16;
public final static byte CONSTANT_unused17 = 17; // unused
public final static byte CONSTANT_InvokeDynamic = 18;
// pseudo-constants:
public final static byte CONSTANT_None = 0;
public final static byte CONSTANT_Signature = CONSTANT_unused13;
public final static byte CONSTANT_BootstrapMethod = CONSTANT_unused17; // used only in InvokeDynamic constants
public final static byte CONSTANT_Limit = 19;
public final static byte CONSTANT_All = 50; // combined global map
public final static byte CONSTANT_LoadableValue = 51; // used for 'KL' and qldc operands
public final static byte CONSTANT_AnyMember = 52; // union of refs to field or (interface) method
public final static byte CONSTANT_FieldSpecific = 53; // used only for 'KQ' ConstantValue attrs
public final static byte CONSTANT_GroupFirst = CONSTANT_All;
public final static byte CONSTANT_GroupLimit = CONSTANT_FieldSpecific+1;
// CONSTANT_MethodHandle reference kinds
public final static byte REF_getField = 1;
public final static byte REF_getStatic = 2;
public final static byte REF_putField = 3;
public final static byte REF_putStatic = 4;
public final static byte REF_invokeVirtual = 5;
public final static byte REF_invokeStatic = 6;
public final static byte REF_invokeSpecial = 7;
public final static byte REF_newInvokeSpecial = 8;
public final static byte REF_invokeInterface = 9;
// pseudo-access bits
public final static int ACC_IC_LONG_FORM = (1<<16); //for ic_flags
// attribute "context types"
public static final int ATTR_CONTEXT_CLASS = 0;
public static final int ATTR_CONTEXT_FIELD = 1;
public static final int ATTR_CONTEXT_METHOD = 2;
public static final int ATTR_CONTEXT_CODE = 3;
public static final int ATTR_CONTEXT_LIMIT = 4;
public static final String[] ATTR_CONTEXT_NAME
= { "class", "field", "method", "code" };
// predefined attr bits
public static final int
X_ATTR_OVERFLOW = 16,
CLASS_ATTR_SourceFile = 17,
METHOD_ATTR_Code = 17,
FIELD_ATTR_ConstantValue = 17,
CLASS_ATTR_EnclosingMethod = 18,
METHOD_ATTR_Exceptions = 18,
X_ATTR_Signature = 19,
X_ATTR_Deprecated = 20,
X_ATTR_RuntimeVisibleAnnotations = 21,
X_ATTR_RuntimeInvisibleAnnotations = 22,
METHOD_ATTR_RuntimeVisibleParameterAnnotations = 23,
CLASS_ATTR_InnerClasses = 23,
METHOD_ATTR_RuntimeInvisibleParameterAnnotations = 24,
CLASS_ATTR_ClassFile_version = 24,
METHOD_ATTR_AnnotationDefault = 25,
METHOD_ATTR_MethodParameters = 26, // JDK8
X_ATTR_RuntimeVisibleTypeAnnotations = 27, // JDK8
X_ATTR_RuntimeInvisibleTypeAnnotations = 28, // JDK8
CODE_ATTR_StackMapTable = 0, // new in Java 6
CODE_ATTR_LineNumberTable = 1,
CODE_ATTR_LocalVariableTable = 2,
CODE_ATTR_LocalVariableTypeTable = 3;
// File option bits, from LSB in ascending bit position.
public static final int FO_DEFLATE_HINT = 1<<0;
public static final int FO_IS_CLASS_STUB = 1<<1;
// Archive option bits, from LSB in ascending bit position:
public static final int AO_HAVE_SPECIAL_FORMATS = 1<<0;
public static final int AO_HAVE_CP_NUMBERS = 1<<1;
public static final int AO_HAVE_ALL_CODE_FLAGS = 1<<2;
public static final int AO_HAVE_CP_EXTRAS = 1<<3;
public static final int AO_HAVE_FILE_HEADERS = 1<<4;
public static final int AO_DEFLATE_HINT = 1<<5;
public static final int AO_HAVE_FILE_MODTIME = 1<<6;
public static final int AO_HAVE_FILE_OPTIONS = 1<<7;
public static final int AO_HAVE_FILE_SIZE_HI = 1<<8;
public static final int AO_HAVE_CLASS_FLAGS_HI = 1<<9;
public static final int AO_HAVE_FIELD_FLAGS_HI = 1<<10;
public static final int AO_HAVE_METHOD_FLAGS_HI = 1<<11;
public static final int AO_HAVE_CODE_FLAGS_HI = 1<<12;
public static final int AO_UNUSED_MBZ = (-1)<<13; // option bits reserved for future use
public static final int LG_AO_HAVE_XXX_FLAGS_HI = 9;
// visitRefs modes:
static final int VRM_CLASSIC = 0;
static final int VRM_PACKAGE = 1;
public static final int NO_MODTIME = 0; // null modtime value
// some comstantly empty containers
public final static int[] noInts = {};
public final static byte[] noBytes = {};
public final static Object[] noValues = {};
public final static String[] noStrings = {};
public final static List<Object> emptyList = Arrays.asList(noValues);
// meta-coding
public final static int
_meta_default = 0,
_meta_canon_min = 1,
_meta_canon_max = 115,
_meta_arb = 116,
_meta_run = 117,
_meta_pop = 141,
_meta_limit = 189;
// bytecodes
public final static int
_nop = 0, // 0x00
_aconst_null = 1, // 0x01
_iconst_m1 = 2, // 0x02
_iconst_0 = 3, // 0x03
_iconst_1 = 4, // 0x04
_iconst_2 = 5, // 0x05
_iconst_3 = 6, // 0x06
_iconst_4 = 7, // 0x07
_iconst_5 = 8, // 0x08
_lconst_0 = 9, // 0x09
_lconst_1 = 10, // 0x0a
_fconst_0 = 11, // 0x0b
_fconst_1 = 12, // 0x0c
_fconst_2 = 13, // 0x0d
_dconst_0 = 14, // 0x0e
_dconst_1 = 15, // 0x0f
_bipush = 16, // 0x10
_sipush = 17, // 0x11
_ldc = 18, // 0x12
_ldc_w = 19, // 0x13
_ldc2_w = 20, // 0x14
_iload = 21, // 0x15
_lload = 22, // 0x16
_fload = 23, // 0x17
_dload = 24, // 0x18
_aload = 25, // 0x19
_iload_0 = 26, // 0x1a
_iload_1 = 27, // 0x1b
_iload_2 = 28, // 0x1c
_iload_3 = 29, // 0x1d
_lload_0 = 30, // 0x1e
_lload_1 = 31, // 0x1f
_lload_2 = 32, // 0x20
_lload_3 = 33, // 0x21
_fload_0 = 34, // 0x22
_fload_1 = 35, // 0x23
_fload_2 = 36, // 0x24
_fload_3 = 37, // 0x25
_dload_0 = 38, // 0x26
_dload_1 = 39, // 0x27
_dload_2 = 40, // 0x28
_dload_3 = 41, // 0x29
_aload_0 = 42, // 0x2a
_aload_1 = 43, // 0x2b
_aload_2 = 44, // 0x2c
_aload_3 = 45, // 0x2d
_iaload = 46, // 0x2e
_laload = 47, // 0x2f
_faload = 48, // 0x30
_daload = 49, // 0x31
_aaload = 50, // 0x32
_baload = 51, // 0x33
_caload = 52, // 0x34
_saload = 53, // 0x35
_istore = 54, // 0x36
_lstore = 55, // 0x37
_fstore = 56, // 0x38
_dstore = 57, // 0x39
_astore = 58, // 0x3a
_istore_0 = 59, // 0x3b
_istore_1 = 60, // 0x3c
_istore_2 = 61, // 0x3d
_istore_3 = 62, // 0x3e
_lstore_0 = 63, // 0x3f
_lstore_1 = 64, // 0x40
_lstore_2 = 65, // 0x41
_lstore_3 = 66, // 0x42
_fstore_0 = 67, // 0x43
_fstore_1 = 68, // 0x44
_fstore_2 = 69, // 0x45
_fstore_3 = 70, // 0x46
_dstore_0 = 71, // 0x47
_dstore_1 = 72, // 0x48
_dstore_2 = 73, // 0x49
_dstore_3 = 74, // 0x4a
_astore_0 = 75, // 0x4b
_astore_1 = 76, // 0x4c
_astore_2 = 77, // 0x4d
_astore_3 = 78, // 0x4e
_iastore = 79, // 0x4f
_lastore = 80, // 0x50
_fastore = 81, // 0x51
_dastore = 82, // 0x52
_aastore = 83, // 0x53
_bastore = 84, // 0x54
_castore = 85, // 0x55
_sastore = 86, // 0x56
_pop = 87, // 0x57
_pop2 = 88, // 0x58
_dup = 89, // 0x59
_dup_x1 = 90, // 0x5a
_dup_x2 = 91, // 0x5b
_dup2 = 92, // 0x5c
_dup2_x1 = 93, // 0x5d
_dup2_x2 = 94, // 0x5e
_swap = 95, // 0x5f
_iadd = 96, // 0x60
_ladd = 97, // 0x61
_fadd = 98, // 0x62
_dadd = 99, // 0x63
_isub = 100, // 0x64
_lsub = 101, // 0x65
_fsub = 102, // 0x66
_dsub = 103, // 0x67
_imul = 104, // 0x68
_lmul = 105, // 0x69
_fmul = 106, // 0x6a
_dmul = 107, // 0x6b
_idiv = 108, // 0x6c
_ldiv = 109, // 0x6d
_fdiv = 110, // 0x6e
_ddiv = 111, // 0x6f
_irem = 112, // 0x70
_lrem = 113, // 0x71
_frem = 114, // 0x72
_drem = 115, // 0x73
_ineg = 116, // 0x74
_lneg = 117, // 0x75
_fneg = 118, // 0x76
_dneg = 119, // 0x77
_ishl = 120, // 0x78
_lshl = 121, // 0x79
_ishr = 122, // 0x7a
_lshr = 123, // 0x7b
_iushr = 124, // 0x7c
_lushr = 125, // 0x7d
_iand = 126, // 0x7e
_land = 127, // 0x7f
_ior = 128, // 0x80
_lor = 129, // 0x81
_ixor = 130, // 0x82
_lxor = 131, // 0x83
_iinc = 132, // 0x84
_i2l = 133, // 0x85
_i2f = 134, // 0x86
_i2d = 135, // 0x87
_l2i = 136, // 0x88
_l2f = 137, // 0x89
_l2d = 138, // 0x8a
_f2i = 139, // 0x8b
_f2l = 140, // 0x8c
_f2d = 141, // 0x8d
_d2i = 142, // 0x8e
_d2l = 143, // 0x8f
_d2f = 144, // 0x90
_i2b = 145, // 0x91
_i2c = 146, // 0x92
_i2s = 147, // 0x93
_lcmp = 148, // 0x94
_fcmpl = 149, // 0x95
_fcmpg = 150, // 0x96
_dcmpl = 151, // 0x97
_dcmpg = 152, // 0x98
_ifeq = 153, // 0x99
_ifne = 154, // 0x9a
_iflt = 155, // 0x9b
_ifge = 156, // 0x9c
_ifgt = 157, // 0x9d
_ifle = 158, // 0x9e
_if_icmpeq = 159, // 0x9f
_if_icmpne = 160, // 0xa0
_if_icmplt = 161, // 0xa1
_if_icmpge = 162, // 0xa2
_if_icmpgt = 163, // 0xa3
_if_icmple = 164, // 0xa4
_if_acmpeq = 165, // 0xa5
_if_acmpne = 166, // 0xa6
_goto = 167, // 0xa7
_jsr = 168, // 0xa8
_ret = 169, // 0xa9
_tableswitch = 170, // 0xaa
_lookupswitch = 171, // 0xab
_ireturn = 172, // 0xac
_lreturn = 173, // 0xad
_freturn = 174, // 0xae
_dreturn = 175, // 0xaf
_areturn = 176, // 0xb0
_return = 177, // 0xb1
_getstatic = 178, // 0xb2
_putstatic = 179, // 0xb3
_getfield = 180, // 0xb4
_putfield = 181, // 0xb5
_invokevirtual = 182, // 0xb6
_invokespecial = 183, // 0xb7
_invokestatic = 184, // 0xb8
_invokeinterface = 185, // 0xb9
_invokedynamic = 186, // 0xba
_new = 187, // 0xbb
_newarray = 188, // 0xbc
_anewarray = 189, // 0xbd
_arraylength = 190, // 0xbe
_athrow = 191, // 0xbf
_checkcast = 192, // 0xc0
_instanceof = 193, // 0xc1
_monitorenter = 194, // 0xc2
_monitorexit = 195, // 0xc3
_wide = 196, // 0xc4
_multianewarray = 197, // 0xc5
_ifnull = 198, // 0xc6
_ifnonnull = 199, // 0xc7
_goto_w = 200, // 0xc8
_jsr_w = 201, // 0xc9
_bytecode_limit = 202; // 0xca
// End marker, used to terminate bytecode sequences:
public final static int _end_marker = 255;
// Escapes:
public final static int _byte_escape = 254;
public final static int _ref_escape = 253;
// Self-relative pseudo-opcodes for better compression.
// A "linker op" is a bytecode which links to a class member.
// (But in what follows, "invokeinterface" ops are excluded.)
//
// A "self linker op" is a variant bytecode which works only
// with the current class or its super. Because the number of
// possible targets is small, it admits a more compact encoding.
// Self linker ops are allowed to absorb a previous "aload_0" op.
// There are (7 * 4) self linker ops (super or not, aload_0 or not).
//
// For simplicity, we define the full symmetric set of variants.
// However, some of them are relatively useless.
// Self linker ops are enabled by Pack.selfCallVariants (true).
public final static int _first_linker_op = _getstatic;
public final static int _last_linker_op = _invokestatic;
public final static int _num_linker_ops = (_last_linker_op - _first_linker_op) + 1;
public final static int _self_linker_op = _bytecode_limit;
public final static int _self_linker_aload_flag = 1*_num_linker_ops;
public final static int _self_linker_super_flag = 2*_num_linker_ops;
public final static int _self_linker_limit = _self_linker_op + 4*_num_linker_ops;
// An "invoke init" op is a variant of invokespecial which works
// only with the method name "<init>". There are variants which
// link to the current class, the super class, or the class of the
// immediately previous "newinstance" op. There are 3 of these ops.
// They all take method signature references as operands.
// Invoke init ops are enabled by Pack.initCallVariants (true).
public final static int _invokeinit_op = _self_linker_limit;
public final static int _invokeinit_self_option = 0;
public final static int _invokeinit_super_option = 1;
public final static int _invokeinit_new_option = 2;
public final static int _invokeinit_limit = _invokeinit_op+3;
public final static int _pseudo_instruction_limit = _invokeinit_limit;
// linker variant limit == 202+(7*4)+3 == 233
// Ldc variants support strongly typed references to constants.
// This lets us index constant pool entries completely according to tag,
// which is a great simplification.
// Ldc variants gain us only 0.007% improvement in compression ratio,
// but they simplify the file format greatly.
public final static int _xldc_op = _invokeinit_limit;
public final static int _sldc = _ldc; // previously named _aldc
public final static int _cldc = _xldc_op+0;
public final static int _ildc = _xldc_op+1;
public final static int _fldc = _xldc_op+2;
public final static int _sldc_w = _ldc_w; // previously named _aldc_w
public final static int _cldc_w = _xldc_op+3;
public final static int _ildc_w = _xldc_op+4;
public final static int _fldc_w = _xldc_op+5;
public final static int _lldc2_w = _ldc2_w;
public final static int _dldc2_w = _xldc_op+6;
// anything other than primitive, string, or class must be handled with qldc:
public final static int _qldc = _xldc_op+7;
public final static int _qldc_w = _xldc_op+8;
public final static int _xldc_limit = _xldc_op+9;
// handling of InterfaceMethodRef
public final static int _invoke_int_op = _xldc_limit;
public final static int _invokespecial_int = _invoke_int_op+0;
public final static int _invokestatic_int = _invoke_int_op+1;
public final static int _invoke_int_limit = _invoke_int_op+2;
}
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