Mercurial > hg > truffle
view graal/com.oracle.graal.bytecode/src/com/oracle/graal/bytecode/Bytecodes.java @ 21536:7fed589ff982
remove documentation about extended bytecodes
| author | Doug Simon <doug.simon@oracle.com> |
|---|---|
| date | Mon, 25 May 2015 11:06:22 +0200 |
| parents | ab489bac3bc8 |
| children | 27943aac2e3c |
line wrap: on
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/* * Copyright (c) 2009, 2011, 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. */ package com.oracle.graal.bytecode; import static com.oracle.graal.bytecode.Bytecodes.Flags.*; import java.lang.reflect.*; /** * Definitions of the standard Java bytecodes defined by <a href= * "http://java.sun.com/docs/books/jvms/second_edition/html/VMSpecTOC.doc.html"> Java Virtual * Machine Specification</a>. */ public class Bytecodes { // @formatter:off public static final int NOP = 0; // 0x00 public static final int ACONST_NULL = 1; // 0x01 public static final int ICONST_M1 = 2; // 0x02 public static final int ICONST_0 = 3; // 0x03 public static final int ICONST_1 = 4; // 0x04 public static final int ICONST_2 = 5; // 0x05 public static final int ICONST_3 = 6; // 0x06 public static final int ICONST_4 = 7; // 0x07 public static final int ICONST_5 = 8; // 0x08 public static final int LCONST_0 = 9; // 0x09 public static final int LCONST_1 = 10; // 0x0A public static final int FCONST_0 = 11; // 0x0B public static final int FCONST_1 = 12; // 0x0C public static final int FCONST_2 = 13; // 0x0D public static final int DCONST_0 = 14; // 0x0E public static final int DCONST_1 = 15; // 0x0F public static final int BIPUSH = 16; // 0x10 public static final int SIPUSH = 17; // 0x11 public static final int LDC = 18; // 0x12 public static final int LDC_W = 19; // 0x13 public static final int LDC2_W = 20; // 0x14 public static final int ILOAD = 21; // 0x15 public static final int LLOAD = 22; // 0x16 public static final int FLOAD = 23; // 0x17 public static final int DLOAD = 24; // 0x18 public static final int ALOAD = 25; // 0x19 public static final int ILOAD_0 = 26; // 0x1A public static final int ILOAD_1 = 27; // 0x1B public static final int ILOAD_2 = 28; // 0x1C public static final int ILOAD_3 = 29; // 0x1D public static final int LLOAD_0 = 30; // 0x1E public static final int LLOAD_1 = 31; // 0x1F public static final int LLOAD_2 = 32; // 0x20 public static final int LLOAD_3 = 33; // 0x21 public static final int FLOAD_0 = 34; // 0x22 public static final int FLOAD_1 = 35; // 0x23 public static final int FLOAD_2 = 36; // 0x24 public static final int FLOAD_3 = 37; // 0x25 public static final int DLOAD_0 = 38; // 0x26 public static final int DLOAD_1 = 39; // 0x27 public static final int DLOAD_2 = 40; // 0x28 public static final int DLOAD_3 = 41; // 0x29 public static final int ALOAD_0 = 42; // 0x2A public static final int ALOAD_1 = 43; // 0x2B public static final int ALOAD_2 = 44; // 0x2C public static final int ALOAD_3 = 45; // 0x2D public static final int IALOAD = 46; // 0x2E public static final int LALOAD = 47; // 0x2F public static final int FALOAD = 48; // 0x30 public static final int DALOAD = 49; // 0x31 public static final int AALOAD = 50; // 0x32 public static final int BALOAD = 51; // 0x33 public static final int CALOAD = 52; // 0x34 public static final int SALOAD = 53; // 0x35 public static final int ISTORE = 54; // 0x36 public static final int LSTORE = 55; // 0x37 public static final int FSTORE = 56; // 0x38 public static final int DSTORE = 57; // 0x39 public static final int ASTORE = 58; // 0x3A public static final int ISTORE_0 = 59; // 0x3B public static final int ISTORE_1 = 60; // 0x3C public static final int ISTORE_2 = 61; // 0x3D public static final int ISTORE_3 = 62; // 0x3E public static final int LSTORE_0 = 63; // 0x3F public static final int LSTORE_1 = 64; // 0x40 public static final int LSTORE_2 = 65; // 0x41 public static final int LSTORE_3 = 66; // 0x42 public static final int FSTORE_0 = 67; // 0x43 public static final int FSTORE_1 = 68; // 0x44 public static final int FSTORE_2 = 69; // 0x45 public static final int FSTORE_3 = 70; // 0x46 public static final int DSTORE_0 = 71; // 0x47 public static final int DSTORE_1 = 72; // 0x48 public static final int DSTORE_2 = 73; // 0x49 public static final int DSTORE_3 = 74; // 0x4A public static final int ASTORE_0 = 75; // 0x4B public static final int ASTORE_1 = 76; // 0x4C public static final int ASTORE_2 = 77; // 0x4D public static final int ASTORE_3 = 78; // 0x4E public static final int IASTORE = 79; // 0x4F public static final int LASTORE = 80; // 0x50 public static final int FASTORE = 81; // 0x51 public static final int DASTORE = 82; // 0x52 public static final int AASTORE = 83; // 0x53 public static final int BASTORE = 84; // 0x54 public static final int CASTORE = 85; // 0x55 public static final int SASTORE = 86; // 0x56 public static final int POP = 87; // 0x57 public static final int POP2 = 88; // 0x58 public static final int DUP = 89; // 0x59 public static final int DUP_X1 = 90; // 0x5A public static final int DUP_X2 = 91; // 0x5B public static final int DUP2 = 92; // 0x5C public static final int DUP2_X1 = 93; // 0x5D public static final int DUP2_X2 = 94; // 0x5E public static final int SWAP = 95; // 0x5F public static final int IADD = 96; // 0x60 public static final int LADD = 97; // 0x61 public static final int FADD = 98; // 0x62 public static final int DADD = 99; // 0x63 public static final int ISUB = 100; // 0x64 public static final int LSUB = 101; // 0x65 public static final int FSUB = 102; // 0x66 public static final int DSUB = 103; // 0x67 public static final int IMUL = 104; // 0x68 public static final int LMUL = 105; // 0x69 public static final int FMUL = 106; // 0x6A public static final int DMUL = 107; // 0x6B public static final int IDIV = 108; // 0x6C public static final int LDIV = 109; // 0x6D public static final int FDIV = 110; // 0x6E public static final int DDIV = 111; // 0x6F public static final int IREM = 112; // 0x70 public static final int LREM = 113; // 0x71 public static final int FREM = 114; // 0x72 public static final int DREM = 115; // 0x73 public static final int INEG = 116; // 0x74 public static final int LNEG = 117; // 0x75 public static final int FNEG = 118; // 0x76 public static final int DNEG = 119; // 0x77 public static final int ISHL = 120; // 0x78 public static final int LSHL = 121; // 0x79 public static final int ISHR = 122; // 0x7A public static final int LSHR = 123; // 0x7B public static final int IUSHR = 124; // 0x7C public static final int LUSHR = 125; // 0x7D public static final int IAND = 126; // 0x7E public static final int LAND = 127; // 0x7F public static final int IOR = 128; // 0x80 public static final int LOR = 129; // 0x81 public static final int IXOR = 130; // 0x82 public static final int LXOR = 131; // 0x83 public static final int IINC = 132; // 0x84 public static final int I2L = 133; // 0x85 public static final int I2F = 134; // 0x86 public static final int I2D = 135; // 0x87 public static final int L2I = 136; // 0x88 public static final int L2F = 137; // 0x89 public static final int L2D = 138; // 0x8A public static final int F2I = 139; // 0x8B public static final int F2L = 140; // 0x8C public static final int F2D = 141; // 0x8D public static final int D2I = 142; // 0x8E public static final int D2L = 143; // 0x8F public static final int D2F = 144; // 0x90 public static final int I2B = 145; // 0x91 public static final int I2C = 146; // 0x92 public static final int I2S = 147; // 0x93 public static final int LCMP = 148; // 0x94 public static final int FCMPL = 149; // 0x95 public static final int FCMPG = 150; // 0x96 public static final int DCMPL = 151; // 0x97 public static final int DCMPG = 152; // 0x98 public static final int IFEQ = 153; // 0x99 public static final int IFNE = 154; // 0x9A public static final int IFLT = 155; // 0x9B public static final int IFGE = 156; // 0x9C public static final int IFGT = 157; // 0x9D public static final int IFLE = 158; // 0x9E public static final int IF_ICMPEQ = 159; // 0x9F public static final int IF_ICMPNE = 160; // 0xA0 public static final int IF_ICMPLT = 161; // 0xA1 public static final int IF_ICMPGE = 162; // 0xA2 public static final int IF_ICMPGT = 163; // 0xA3 public static final int IF_ICMPLE = 164; // 0xA4 public static final int IF_ACMPEQ = 165; // 0xA5 public static final int IF_ACMPNE = 166; // 0xA6 public static final int GOTO = 167; // 0xA7 public static final int JSR = 168; // 0xA8 public static final int RET = 169; // 0xA9 public static final int TABLESWITCH = 170; // 0xAA public static final int LOOKUPSWITCH = 171; // 0xAB public static final int IRETURN = 172; // 0xAC public static final int LRETURN = 173; // 0xAD public static final int FRETURN = 174; // 0xAE public static final int DRETURN = 175; // 0xAF public static final int ARETURN = 176; // 0xB0 public static final int RETURN = 177; // 0xB1 public static final int GETSTATIC = 178; // 0xB2 public static final int PUTSTATIC = 179; // 0xB3 public static final int GETFIELD = 180; // 0xB4 public static final int PUTFIELD = 181; // 0xB5 public static final int INVOKEVIRTUAL = 182; // 0xB6 public static final int INVOKESPECIAL = 183; // 0xB7 public static final int INVOKESTATIC = 184; // 0xB8 public static final int INVOKEINTERFACE = 185; // 0xB9 public static final int INVOKEDYNAMIC = 186; // 0xBA public static final int NEW = 187; // 0xBB public static final int NEWARRAY = 188; // 0xBC public static final int ANEWARRAY = 189; // 0xBD public static final int ARRAYLENGTH = 190; // 0xBE public static final int ATHROW = 191; // 0xBF public static final int CHECKCAST = 192; // 0xC0 public static final int INSTANCEOF = 193; // 0xC1 public static final int MONITORENTER = 194; // 0xC2 public static final int MONITOREXIT = 195; // 0xC3 public static final int WIDE = 196; // 0xC4 public static final int MULTIANEWARRAY = 197; // 0xC5 public static final int IFNULL = 198; // 0xC6 public static final int IFNONNULL = 199; // 0xC7 public static final int GOTO_W = 200; // 0xC8 public static final int JSR_W = 201; // 0xC9 public static final int BREAKPOINT = 202; // 0xCA public static final int ILLEGAL = 255; public static final int END = 256; // @formatter:on /** * The last opcode defined by the JVM specification. To iterate over all JVM bytecodes: * * <pre> * for (int opcode = 0; opcode <= Bytecodes.LAST_JVM_OPCODE; ++opcode) { * // * } * </pre> */ public static final int LAST_JVM_OPCODE = JSR_W; /** * A collection of flags describing various bytecode attributes. */ static class Flags { /** * Denotes an instruction that ends a basic block and does not let control flow fall through * to its lexical successor. */ static final int STOP = 0x00000001; /** * Denotes an instruction that ends a basic block and may let control flow fall through to * its lexical successor. In practice this means it is a conditional branch. */ static final int FALL_THROUGH = 0x00000002; /** * Denotes an instruction that has a 2 or 4 byte operand that is an offset to another * instruction in the same method. This does not include the {@link Bytecodes#TABLESWITCH} * or {@link Bytecodes#LOOKUPSWITCH} instructions. */ static final int BRANCH = 0x00000004; /** * Denotes an instruction that reads the value of a static or instance field. */ static final int FIELD_READ = 0x00000008; /** * Denotes an instruction that writes the value of a static or instance field. */ static final int FIELD_WRITE = 0x00000010; /** * Denotes an instruction that can cause a trap. */ static final int TRAP = 0x00000080; /** * Denotes an instruction that is commutative. */ static final int COMMUTATIVE = 0x00000100; /** * Denotes an instruction that is associative. */ static final int ASSOCIATIVE = 0x00000200; /** * Denotes an instruction that loads an operand. */ static final int LOAD = 0x00000400; /** * Denotes an instruction that stores an operand. */ static final int STORE = 0x00000800; /** * Denotes the 4 INVOKE* instructions. */ static final int INVOKE = 0x00001000; } // Performs a sanity check that none of the flags overlap. static { int allFlags = 0; try { for (Field field : Flags.class.getDeclaredFields()) { int flagsFilter = Modifier.FINAL | Modifier.STATIC; if ((field.getModifiers() & flagsFilter) == flagsFilter && !field.isSynthetic()) { assert field.getType() == int.class : "Field is not int : " + field; final int flag = field.getInt(null); assert flag != 0; assert (flag & allFlags) == 0 : field.getName() + " has a value conflicting with another flag"; allFlags |= flag; } } } catch (Exception e) { throw new InternalError(e.toString()); } } /** * An array that maps from a bytecode value to a {@link String} for the corresponding * instruction mnemonic. */ private static final String[] nameArray = new String[256]; /** * An array that maps from a bytecode value to the set of {@link Flags} for the corresponding * instruction. */ private static final int[] flagsArray = new int[256]; /** * An array that maps from a bytecode value to the length in bytes for the corresponding * instruction. */ private static final int[] lengthArray = new int[256]; /** * An array that maps from a bytecode value to the number of slots pushed on the stack by the * corresponding instruction. */ private static final int[] stackEffectArray = new int[256]; // Checkstyle: stop // @formatter:off static { def(NOP , "nop" , "b" , 0); def(ACONST_NULL , "aconst_null" , "b" , 1); def(ICONST_M1 , "iconst_m1" , "b" , 1); def(ICONST_0 , "iconst_0" , "b" , 1); def(ICONST_1 , "iconst_1" , "b" , 1); def(ICONST_2 , "iconst_2" , "b" , 1); def(ICONST_3 , "iconst_3" , "b" , 1); def(ICONST_4 , "iconst_4" , "b" , 1); def(ICONST_5 , "iconst_5" , "b" , 1); def(LCONST_0 , "lconst_0" , "b" , 2); def(LCONST_1 , "lconst_1" , "b" , 2); def(FCONST_0 , "fconst_0" , "b" , 1); def(FCONST_1 , "fconst_1" , "b" , 1); def(FCONST_2 , "fconst_2" , "b" , 1); def(DCONST_0 , "dconst_0" , "b" , 2); def(DCONST_1 , "dconst_1" , "b" , 2); def(BIPUSH , "bipush" , "bc" , 1); def(SIPUSH , "sipush" , "bcc" , 1); def(LDC , "ldc" , "bi" , 1, TRAP); def(LDC_W , "ldc_w" , "bii" , 1, TRAP); def(LDC2_W , "ldc2_w" , "bii" , 2, TRAP); def(ILOAD , "iload" , "bi" , 1, LOAD); def(LLOAD , "lload" , "bi" , 2, LOAD); def(FLOAD , "fload" , "bi" , 1, LOAD); def(DLOAD , "dload" , "bi" , 2, LOAD); def(ALOAD , "aload" , "bi" , 1, LOAD); def(ILOAD_0 , "iload_0" , "b" , 1, LOAD); def(ILOAD_1 , "iload_1" , "b" , 1, LOAD); def(ILOAD_2 , "iload_2" , "b" , 1, LOAD); def(ILOAD_3 , "iload_3" , "b" , 1, LOAD); def(LLOAD_0 , "lload_0" , "b" , 2, LOAD); def(LLOAD_1 , "lload_1" , "b" , 2, LOAD); def(LLOAD_2 , "lload_2" , "b" , 2, LOAD); def(LLOAD_3 , "lload_3" , "b" , 2, LOAD); def(FLOAD_0 , "fload_0" , "b" , 1, LOAD); def(FLOAD_1 , "fload_1" , "b" , 1, LOAD); def(FLOAD_2 , "fload_2" , "b" , 1, LOAD); def(FLOAD_3 , "fload_3" , "b" , 1, LOAD); def(DLOAD_0 , "dload_0" , "b" , 2, LOAD); def(DLOAD_1 , "dload_1" , "b" , 2, LOAD); def(DLOAD_2 , "dload_2" , "b" , 2, LOAD); def(DLOAD_3 , "dload_3" , "b" , 2, LOAD); def(ALOAD_0 , "aload_0" , "b" , 1, LOAD); def(ALOAD_1 , "aload_1" , "b" , 1, LOAD); def(ALOAD_2 , "aload_2" , "b" , 1, LOAD); def(ALOAD_3 , "aload_3" , "b" , 1, LOAD); def(IALOAD , "iaload" , "b" , -1, TRAP); def(LALOAD , "laload" , "b" , 0, TRAP); def(FALOAD , "faload" , "b" , -1, TRAP); def(DALOAD , "daload" , "b" , 0, TRAP); def(AALOAD , "aaload" , "b" , -1, TRAP); def(BALOAD , "baload" , "b" , -1, TRAP); def(CALOAD , "caload" , "b" , -1, TRAP); def(SALOAD , "saload" , "b" , -1, TRAP); def(ISTORE , "istore" , "bi" , -1, STORE); def(LSTORE , "lstore" , "bi" , -2, STORE); def(FSTORE , "fstore" , "bi" , -1, STORE); def(DSTORE , "dstore" , "bi" , -2, STORE); def(ASTORE , "astore" , "bi" , -1, STORE); def(ISTORE_0 , "istore_0" , "b" , -1, STORE); def(ISTORE_1 , "istore_1" , "b" , -1, STORE); def(ISTORE_2 , "istore_2" , "b" , -1, STORE); def(ISTORE_3 , "istore_3" , "b" , -1, STORE); def(LSTORE_0 , "lstore_0" , "b" , -2, STORE); def(LSTORE_1 , "lstore_1" , "b" , -2, STORE); def(LSTORE_2 , "lstore_2" , "b" , -2, STORE); def(LSTORE_3 , "lstore_3" , "b" , -2, STORE); def(FSTORE_0 , "fstore_0" , "b" , -1, STORE); def(FSTORE_1 , "fstore_1" , "b" , -1, STORE); def(FSTORE_2 , "fstore_2" , "b" , -1, STORE); def(FSTORE_3 , "fstore_3" , "b" , -1, STORE); def(DSTORE_0 , "dstore_0" , "b" , -2, STORE); def(DSTORE_1 , "dstore_1" , "b" , -2, STORE); def(DSTORE_2 , "dstore_2" , "b" , -2, STORE); def(DSTORE_3 , "dstore_3" , "b" , -2, STORE); def(ASTORE_0 , "astore_0" , "b" , -1, STORE); def(ASTORE_1 , "astore_1" , "b" , -1, STORE); def(ASTORE_2 , "astore_2" , "b" , -1, STORE); def(ASTORE_3 , "astore_3" , "b" , -1, STORE); def(IASTORE , "iastore" , "b" , -3, TRAP); def(LASTORE , "lastore" , "b" , -4, TRAP); def(FASTORE , "fastore" , "b" , -3, TRAP); def(DASTORE , "dastore" , "b" , -4, TRAP); def(AASTORE , "aastore" , "b" , -3, TRAP); def(BASTORE , "bastore" , "b" , -3, TRAP); def(CASTORE , "castore" , "b" , -3, TRAP); def(SASTORE , "sastore" , "b" , -3, TRAP); def(POP , "pop" , "b" , -1); def(POP2 , "pop2" , "b" , -2); def(DUP , "dup" , "b" , 1); def(DUP_X1 , "dup_x1" , "b" , 1); def(DUP_X2 , "dup_x2" , "b" , 1); def(DUP2 , "dup2" , "b" , 2); def(DUP2_X1 , "dup2_x1" , "b" , 2); def(DUP2_X2 , "dup2_x2" , "b" , 2); def(SWAP , "swap" , "b" , 0); def(IADD , "iadd" , "b" , -1, COMMUTATIVE | ASSOCIATIVE); def(LADD , "ladd" , "b" , -2, COMMUTATIVE | ASSOCIATIVE); def(FADD , "fadd" , "b" , -1, COMMUTATIVE | ASSOCIATIVE); def(DADD , "dadd" , "b" , -2, COMMUTATIVE | ASSOCIATIVE); def(ISUB , "isub" , "b" , -1); def(LSUB , "lsub" , "b" , -2); def(FSUB , "fsub" , "b" , -1); def(DSUB , "dsub" , "b" , -2); def(IMUL , "imul" , "b" , -1, COMMUTATIVE | ASSOCIATIVE); def(LMUL , "lmul" , "b" , -2, COMMUTATIVE | ASSOCIATIVE); def(FMUL , "fmul" , "b" , -1, COMMUTATIVE | ASSOCIATIVE); def(DMUL , "dmul" , "b" , -2, COMMUTATIVE | ASSOCIATIVE); def(IDIV , "idiv" , "b" , -1, TRAP); def(LDIV , "ldiv" , "b" , -2, TRAP); def(FDIV , "fdiv" , "b" , -1); def(DDIV , "ddiv" , "b" , -2); def(IREM , "irem" , "b" , -1, TRAP); def(LREM , "lrem" , "b" , -2, TRAP); def(FREM , "frem" , "b" , -1); def(DREM , "drem" , "b" , -2); def(INEG , "ineg" , "b" , 0); def(LNEG , "lneg" , "b" , 0); def(FNEG , "fneg" , "b" , 0); def(DNEG , "dneg" , "b" , 0); def(ISHL , "ishl" , "b" , -1); def(LSHL , "lshl" , "b" , -1); def(ISHR , "ishr" , "b" , -1); def(LSHR , "lshr" , "b" , -1); def(IUSHR , "iushr" , "b" , -1); def(LUSHR , "lushr" , "b" , -1); def(IAND , "iand" , "b" , -1, COMMUTATIVE | ASSOCIATIVE); def(LAND , "land" , "b" , -2, COMMUTATIVE | ASSOCIATIVE); def(IOR , "ior" , "b" , -1, COMMUTATIVE | ASSOCIATIVE); def(LOR , "lor" , "b" , -2, COMMUTATIVE | ASSOCIATIVE); def(IXOR , "ixor" , "b" , -1, COMMUTATIVE | ASSOCIATIVE); def(LXOR , "lxor" , "b" , -2, COMMUTATIVE | ASSOCIATIVE); def(IINC , "iinc" , "bic" , 0, LOAD | STORE); def(I2L , "i2l" , "b" , 1); def(I2F , "i2f" , "b" , 0); def(I2D , "i2d" , "b" , 1); def(L2I , "l2i" , "b" , -1); def(L2F , "l2f" , "b" , -1); def(L2D , "l2d" , "b" , 0); def(F2I , "f2i" , "b" , 0); def(F2L , "f2l" , "b" , 1); def(F2D , "f2d" , "b" , 1); def(D2I , "d2i" , "b" , -1); def(D2L , "d2l" , "b" , 0); def(D2F , "d2f" , "b" , -1); def(I2B , "i2b" , "b" , 0); def(I2C , "i2c" , "b" , 0); def(I2S , "i2s" , "b" , 0); def(LCMP , "lcmp" , "b" , -3); def(FCMPL , "fcmpl" , "b" , -1); def(FCMPG , "fcmpg" , "b" , -1); def(DCMPL , "dcmpl" , "b" , -3); def(DCMPG , "dcmpg" , "b" , -3); def(IFEQ , "ifeq" , "boo" , -1, FALL_THROUGH | BRANCH); def(IFNE , "ifne" , "boo" , -1, FALL_THROUGH | BRANCH); def(IFLT , "iflt" , "boo" , -1, FALL_THROUGH | BRANCH); def(IFGE , "ifge" , "boo" , -1, FALL_THROUGH | BRANCH); def(IFGT , "ifgt" , "boo" , -1, FALL_THROUGH | BRANCH); def(IFLE , "ifle" , "boo" , -1, FALL_THROUGH | BRANCH); def(IF_ICMPEQ , "if_icmpeq" , "boo" , -2, COMMUTATIVE | FALL_THROUGH | BRANCH); def(IF_ICMPNE , "if_icmpne" , "boo" , -2, COMMUTATIVE | FALL_THROUGH | BRANCH); def(IF_ICMPLT , "if_icmplt" , "boo" , -2, FALL_THROUGH | BRANCH); def(IF_ICMPGE , "if_icmpge" , "boo" , -2, FALL_THROUGH | BRANCH); def(IF_ICMPGT , "if_icmpgt" , "boo" , -2, FALL_THROUGH | BRANCH); def(IF_ICMPLE , "if_icmple" , "boo" , -2, FALL_THROUGH | BRANCH); def(IF_ACMPEQ , "if_acmpeq" , "boo" , -2, COMMUTATIVE | FALL_THROUGH | BRANCH); def(IF_ACMPNE , "if_acmpne" , "boo" , -2, COMMUTATIVE | FALL_THROUGH | BRANCH); def(GOTO , "goto" , "boo" , 0, STOP | BRANCH); def(JSR , "jsr" , "boo" , 0, STOP | BRANCH); def(RET , "ret" , "bi" , 0, STOP); def(TABLESWITCH , "tableswitch" , "" , -1, STOP); def(LOOKUPSWITCH , "lookupswitch" , "" , -1, STOP); def(IRETURN , "ireturn" , "b" , -1, TRAP | STOP); def(LRETURN , "lreturn" , "b" , -2, TRAP | STOP); def(FRETURN , "freturn" , "b" , -1, TRAP | STOP); def(DRETURN , "dreturn" , "b" , -2, TRAP | STOP); def(ARETURN , "areturn" , "b" , -1, TRAP | STOP); def(RETURN , "return" , "b" , 0, TRAP | STOP); def(GETSTATIC , "getstatic" , "bjj" , 1, TRAP | FIELD_READ); def(PUTSTATIC , "putstatic" , "bjj" , -1, TRAP | FIELD_WRITE); def(GETFIELD , "getfield" , "bjj" , 0, TRAP | FIELD_READ); def(PUTFIELD , "putfield" , "bjj" , -2, TRAP | FIELD_WRITE); def(INVOKEVIRTUAL , "invokevirtual" , "bjj" , -1, TRAP | INVOKE); def(INVOKESPECIAL , "invokespecial" , "bjj" , -1, TRAP | INVOKE); def(INVOKESTATIC , "invokestatic" , "bjj" , 0, TRAP | INVOKE); def(INVOKEINTERFACE , "invokeinterface" , "bjja_", -1, TRAP | INVOKE); def(INVOKEDYNAMIC , "invokedynamic" , "bjjjj", 0, TRAP | INVOKE); def(NEW , "new" , "bii" , 1, TRAP); def(NEWARRAY , "newarray" , "bc" , 0, TRAP); def(ANEWARRAY , "anewarray" , "bii" , 0, TRAP); def(ARRAYLENGTH , "arraylength" , "b" , 0, TRAP); def(ATHROW , "athrow" , "b" , -1, TRAP | STOP); def(CHECKCAST , "checkcast" , "bii" , 0, TRAP); def(INSTANCEOF , "instanceof" , "bii" , 0, TRAP); def(MONITORENTER , "monitorenter" , "b" , -1, TRAP); def(MONITOREXIT , "monitorexit" , "b" , -1, TRAP); def(WIDE , "wide" , "" , 0); def(MULTIANEWARRAY , "multianewarray" , "biic" , 1, TRAP); def(IFNULL , "ifnull" , "boo" , -1, FALL_THROUGH | BRANCH); def(IFNONNULL , "ifnonnull" , "boo" , -1, FALL_THROUGH | BRANCH); def(GOTO_W , "goto_w" , "boooo", 0, STOP | BRANCH); def(JSR_W , "jsr_w" , "boooo", 0, STOP | BRANCH); def(BREAKPOINT , "breakpoint" , "b" , 0, TRAP); } // @formatter:on // Checkstyle: resume /** * Determines if an opcode is commutative. * * @param opcode the opcode to check * @return {@code true} iff commutative */ public static boolean isCommutative(int opcode) { return (flagsArray[opcode & 0xff] & COMMUTATIVE) != 0; } /** * Gets the length of an instruction denoted by a given opcode. * * @param opcode an instruction opcode * @return the length of the instruction denoted by {@code opcode}. If {@code opcode} is an * illegal instruction or denotes a variable length instruction (e.g. * {@link #TABLESWITCH}), then 0 is returned. */ public static int lengthOf(int opcode) { return lengthArray[opcode & 0xff]; } /** * Gets the effect on the depth of the expression stack of an instruction denoted by a given * opcode. * * @param opcode an instruction opcode * @return the change in the stack caused by the instruction denoted by {@code opcode}. If * {@code opcode} is an illegal instruction then 0 is returned. Note that invoke * instructions may pop more arguments so this value is a minimum stack effect. */ public static int stackEffectOf(int opcode) { return stackEffectArray[opcode & 0xff]; } /** * Gets the lower-case mnemonic for a given opcode. * * @param opcode an opcode * @return the mnemonic for {@code opcode} or {@code "<illegal opcode: " + opcode + ">"} if * {@code opcode} is not a legal opcode */ public static String nameOf(int opcode) throws IllegalArgumentException { String name = nameArray[opcode & 0xff]; if (name == null) { return "<illegal opcode: " + opcode + ">"; } return name; } /** * Allocation-free version of {@linkplain #nameOf(int)}. * * @param opcode an opcode. * @return the mnemonic for {@code opcode} or {@code "<illegal opcode>"} if {@code opcode} is * not a legal opcode. */ public static String baseNameOf(int opcode) { String name = nameArray[opcode & 0xff]; if (name == null) { return "<illegal opcode>"; } return name; } /** * Gets the opcode corresponding to a given mnemonic. * * @param name an opcode mnemonic * @return the opcode corresponding to {@code mnemonic} * @throws IllegalArgumentException if {@code name} does not denote a valid opcode */ public static int valueOf(String name) { for (int opcode = 0; opcode < nameArray.length; ++opcode) { if (name.equalsIgnoreCase(nameArray[opcode])) { return opcode; } } throw new IllegalArgumentException("No opcode for " + name); } /** * Determines if a given opcode denotes an instruction that can cause an implicit exception. * * @param opcode an opcode to test * @return {@code true} iff {@code opcode} can cause an implicit exception, {@code false} * otherwise */ public static boolean canTrap(int opcode) { return (flagsArray[opcode & 0xff] & TRAP) != 0; } /** * Determines if a given opcode denotes an instruction that loads a local variable to the * operand stack. * * @param opcode an opcode to test * @return {@code true} iff {@code opcode} loads a local variable to the operand stack, * {@code false} otherwise */ public static boolean isLoad(int opcode) { return (flagsArray[opcode & 0xff] & LOAD) != 0; } /** * Determines if a given opcode denotes an instruction that ends a basic block and does not let * control flow fall through to its lexical successor. * * @param opcode an opcode to test * @return {@code true} iff {@code opcode} properly ends a basic block */ public static boolean isStop(int opcode) { return (flagsArray[opcode & 0xff] & STOP) != 0; } /** * Determines if a given opcode denotes an instruction that stores a value to a local variable * after popping it from the operand stack. * * @param opcode an opcode to test * @return {@code true} iff {@code opcode} stores a value to a local variable, {@code false} * otherwise */ public static boolean isInvoke(int opcode) { return (flagsArray[opcode & 0xff] & INVOKE) != 0; } /** * Determines if a given opcode denotes an instruction that stores a value to a local variable * after popping it from the operand stack. * * @param opcode an opcode to test * @return {@code true} iff {@code opcode} stores a value to a local variable, {@code false} * otherwise */ public static boolean isStore(int opcode) { return (flagsArray[opcode & 0xff] & STORE) != 0; } /** * Determines if a given opcode is an instruction that delimits a basic block. * * @param opcode an opcode to test * @return {@code true} iff {@code opcode} delimits a basic block */ public static boolean isBlockEnd(int opcode) { return (flagsArray[opcode & 0xff] & (STOP | FALL_THROUGH)) != 0; } /** * Determines if a given opcode is an instruction that has a 2 or 4 byte operand that is an * offset to another instruction in the same method. This does not include the * {@linkplain #TABLESWITCH switch} instructions. * * @param opcode an opcode to test * @return {@code true} iff {@code opcode} is a branch instruction with a single operand */ public static boolean isBranch(int opcode) { return (flagsArray[opcode & 0xff] & BRANCH) != 0; } /** * Determines if a given opcode denotes a conditional branch. * * @param opcode * @return {@code true} iff {@code opcode} is a conditional branch */ public static boolean isConditionalBranch(int opcode) { return (flagsArray[opcode & 0xff] & FALL_THROUGH) != 0; } /** * Gets the arithmetic operator name for a given opcode. If {@code opcode} does not denote an * arithmetic instruction, then the {@linkplain #nameOf(int) name} of the opcode is returned * instead. * * @param op an opcode * @return the arithmetic operator name */ public static String operator(int op) { // Checkstyle: stop switch (op) { // arithmetic ops case IADD: // fall through case LADD: // fall through case FADD: // fall through case DADD: return "+"; case ISUB: // fall through case LSUB: // fall through case FSUB: // fall through case DSUB: return "-"; case IMUL: // fall through case LMUL: // fall through case FMUL: // fall through case DMUL: return "*"; case IDIV: // fall through case LDIV: // fall through case FDIV: // fall through case DDIV: return "/"; case IREM: // fall through case LREM: // fall through case FREM: // fall through case DREM: return "%"; // shift ops case ISHL: // fall through case LSHL: return "<<"; case ISHR: // fall through case LSHR: return ">>"; case IUSHR: // fall through case LUSHR: return ">>>"; // logic ops case IAND: // fall through case LAND: return "&"; case IOR: // fall through case LOR: return "|"; case IXOR: // fall through case LXOR: return "^"; } // Checkstyle: resume return nameOf(op); } /** * Defines a bytecode by entering it into the arrays that record its name, length and flags. * * @param name instruction name (should be lower case) * @param format encodes the length of the instruction */ private static void def(int opcode, String name, String format, int stackEffect) { def(opcode, name, format, stackEffect, 0); } /** * Defines a bytecode by entering it into the arrays that record its name, length and flags. * * @param name instruction name (lower case) * @param format encodes the length of the instruction * @param flags the set of {@link Flags} associated with the instruction */ private static void def(int opcode, String name, String format, int stackEffect, int flags) { assert nameArray[opcode] == null : "opcode " + opcode + " is already bound to name " + nameArray[opcode]; nameArray[opcode] = name; int instructionLength = format.length(); lengthArray[opcode] = instructionLength; stackEffectArray[opcode] = stackEffect; Bytecodes.flagsArray[opcode] = flags; assert !isConditionalBranch(opcode) || isBranch(opcode) : "a conditional branch must also be a branch"; } }