ASM4.0源码走读之二 指令的类型
? ? ? ? 在深入分析ClassReader.readCode()方法之前，我们需要大概了解下ASM把jvm的指令分的类型，这在readCode会用到。先看ClassReader的代码：
static { int i; byte[] b = new byte[220]; String s = "AAAAAAAAAAAAAAAABCLMMDDDDDEEEEEEEEEEEEEEEEEEEEAAAAAAAADD" + "DDDEEEEEEEEEEEEEEEEEEEEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA" + "AAAAAAAAAAAAAAAAANAAAAAAAAAAAAAAAAAAAAJJJJJJJJJJJJJJJJDOPAA" + "AAAAGGGGGGGHIFBFAAFFAARQJJKKJJJJJJJJJJJJJJJJJJ"; for (i = 0; i < b.length; ++i) { b[i] = (byte) (s.charAt(i) - 'A'); } TYPE = b; }? ? ? ? ?这其中的TYPE是一个字节数组，索引是jvm指令的byte值，值从0开始，分了16类，简化后是：
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 1, 2,11,12, 12,3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 0, 0, 0, 0, 0, 0, 0, 0, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,13, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 3,14,15,0, 0, 0, 0, 0, 0, 6, 6, 6, 6, 6, 6, 6, 7, 8, 5, 1, 5, 0, 0, 5, 5, 0, 0, 17,16,9, 9,10,10, 9, 9, 9, 9, 9,9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9
? ? ? 补全下，指令跟指令类型的对照表：
指令操作码 16进制 指令类型 指令##类型为0的指令没有操作数0 = 0x0 = 0 ...............nop1 = 0x1 = 0 ...............aconst_null2 = 0x2 = 0 ...............iconst_m13 = 0x3 = 0 ...............iconst_04 = 0x4 = 0 ...............iconst_15 = 0x5 = 0 ...............iconst_26 = 0x6 = 0 ...............iconst_37 = 0x7 = 0 ...............iconst_48 = 0x8 = 0 ...............iconst_59 = 0x9 = 0 ...............lconst_010 = 0xa = 0 ...............lconst_111 = 0xb = 0 ...............fconst_012 = 0xc = 0 ...............fconst_113 = 0xd = 0 ...............fconst_214 = 0xe = 0 ...............dconst_015 = 0xf = 0 ...............dconst_1##类型为1的指令操作数长度为1个字节16 = 0x10 = 1 ...............bipush##类型为2的指令操作数长度为2个字节17 = 0x11 = 2 ...............sipush18 = 0x12 = 11 ...............ldc19 = 0x13 = 12 ...............ldc_w20 = 0x14 = 12 ...............ldc2_w##类型为3的指令操作数长度为1个字节21 = 0x15 = 3 ...............iload22 = 0x16 = 3 ...............lload23 = 0x17 = 3 ...............fload24 = 0x18 = 3 ...............dload25 = 0x19 = 3 ...............aload##类型为4的指令操作数长度为1个字节26 = 0x1a = 4 ...............iload_027 = 0x1b = 4 ...............iload_128 = 0x1c = 4 ...............iload_229 = 0x1d = 4 ...............iload_330 = 0x1e = 4 ...............lload_031 = 0x1f = 4 ...............lload_132 = 0x20 = 4 ...............lload_233 = 0x21 = 4 ...............lload_334 = 0x22 = 4 ...............fload_035 = 0x23 = 4 ...............fload_136 = 0x24 = 4 ...............fload_237 = 0x25 = 4 ...............fload_338 = 0x26 = 4 ...............dload_039 = 0x27 = 4 ...............dload_140 = 0x28 = 4 ...............dload_241 = 0x29 = 4 ...............dload_342 = 0x2a = 4 ...............aload_043 = 0x2b = 4 ...............aload_144 = 0x2c = 4 ...............aload_245 = 0x2d = 4 ...............aload_346 = 0x2e = 0 ...............iaload47 = 0x2f = 0 ...............laload48 = 0x30 = 0 ...............faload49 = 0x31 = 0 ...............daload50 = 0x32 = 0 ...............aaload51 = 0x33 = 0 ...............baload52 = 0x34 = 0 ...............caload53 = 0x35 = 0 ...............saload54 = 0x36 = 3 ...............istore55 = 0x37 = 3 ...............lstore56 = 0x38 = 3 ...............fstore57 = 0x39 = 3 ...............dstore58 = 0x3a = 3 ...............astore59 = 0x3b = 4 ...............istore_060 = 0x3c = 4 ...............istore_161 = 0x3d = 4 ...............istore_262 = 0x3e = 4 ...............istore_363 = 0x3f = 4 ...............lstore_064 = 0x40 = 4 ...............lstore_165 = 0x41 = 4 ...............lstore_266 = 0x42 = 4 ...............lstore_367 = 0x43 = 4 ...............fstore_068 = 0x44 = 4 ...............fstore_169 = 0x45 = 4 ...............fstore_270 = 0x46 = 4 ...............fstore_371 = 0x47 = 4 ...............dstore_072 = 0x48 = 4 ...............dstore_173 = 0x49 = 4 ...............dstore_274 = 0x4a = 4 ...............dstore_375 = 0x4b = 4 ...............astore_076 = 0x4c = 4 ...............astore_177 = 0x4d = 4 ...............astore_278 = 0x4e = 4 ...............astore_379 = 0x4f = 0 ...............iastore80 = 0x50 = 0 ...............lastore81 = 0x51 = 0 ...............fastore82 = 0x52 = 0 ...............dastore83 = 0x53 = 0 ...............aastore84 = 0x54 = 0 ...............bastore85 = 0x55 = 0 ...............castore86 = 0x56 = 0 ...............sastore87 = 0x57 = 0 ...............pop88 = 0x58 = 0 ...............pop289 = 0x59 = 0 ...............dup90 = 0x5a = 0 ...............dup_x191 = 0x5b = 0 ...............dup_x292 = 0x5c = 0 ...............dup293 = 0x5d = 0 ...............dup2_x194 = 0x5e = 0 ...............dup2_x295 = 0x5f = 0 ...............swap96 = 0x60 = 0 ...............iadd97 = 0x61 = 0 ...............ladd98 = 0x62 = 0 ...............fadd99 = 0x63 = 0 ...............dadd100 = 0x64 = 0 ...............isub101 = 0x65 = 0 ...............lsub102 = 0x66 = 0 ...............fsub103 = 0x67 = 0 ...............dsub104 = 0x68 = 0 ...............imul105 = 0x69 = 0 ...............lmul106 = 0x6a = 0 ...............fmul107 = 0x6b = 0 ...............dmul108 = 0x6c = 0 ...............idiv109 = 0x6d = 0 ...............ldiv110 = 0x6e = 0 ...............fdiv111 = 0x6f = 0 ...............ddiv112 = 0x70 = 0 ...............irem113 = 0x71 = 0 ...............lrem114 = 0x72 = 0 ...............frem115 = 0x73 = 0 ...............drem116 = 0x74 = 0 ...............ineg117 = 0x75 = 0 ...............lneg118 = 0x76 = 0 ...............fneg119 = 0x77 = 0 ...............dneg120 = 0x78 = 0 ...............ishl121 = 0x79 = 0 ...............lshl122 = 0x7a = 0 ...............ishr123 = 0x7b = 0 ...............lshr124 = 0x7c = 0 ...............iushr125 = 0x7d = 0 ...............lushr126 = 0x7e = 0 ...............iand127 = 0x7f = 0 ...............land128 = 0x80 = 0 ...............ior129 = 0x81 = 0 ...............lor130 = 0x82 = 0 ...............ixor131 = 0x83 = 0 ...............lxor132 = 0x84 = 13 ...............iinc133 = 0x85 = 0 ...............i2l134 = 0x86 = 0 ...............i2f135 = 0x87 = 0 ...............i2d136 = 0x88 = 0 ...............l2i137 = 0x89 = 0 ...............l2f138 = 0x8a = 0 ...............l2d139 = 0x8b = 0 ...............f2i140 = 0x8c = 0 ...............f2l141 = 0x8d = 0 ...............f2d142 = 0x8e = 0 ...............d2i143 = 0x8f = 0 ...............d2l144 = 0x90 = 0 ...............d2f145 = 0x91 = 0 ...............i2b146 = 0x92 = 0 ...............i2c147 = 0x93 = 0 ...............i2s148 = 0x94 = 0 ...............lcmp149 = 0x95 = 0 ...............fcmpl150 = 0x96 = 0 ...............fcmpg151 = 0x97 = 0 ...............dcmpl152 = 0x98 = 0 ...............dcmpg#类型为9的指令，主要是if、goto、jsr三大类指令153 = 0x99 = 9 ...............ifeq154 = 0x9a = 9 ...............ifne155 = 0x9b = 9 ...............iflt156 = 0x9c = 9 ...............ifge157 = 0x9d = 9 ...............ifgt158 = 0x9e = 9 ...............ifle159 = 0x9f = 9 ...............if_icmpeq160 = 0xa0 = 9 ...............if_icmpne161 = 0xa1 = 9 ...............if_icmplt162 = 0xa2 = 9 ...............if_icmpge163 = 0xa3 = 9 ...............if_icmpgt164 = 0xa4 = 9 ...............if_icmple165 = 0xa5 = 9 ...............if_acmpeq166 = 0xa6 = 9 ...............if_acmpne167 = 0xa7 = 9 ...............goto168 = 0xa8 = 9 ...............jsr169 = 0xa9 = 3 ...............ret#14 tableswitch 对齐变长，high(4) / low(4) / offsets[(high-low+1)*4]170 = 0xaa = 14 ...............tableswitch#15 lookupswitch 对齐变长 default(4) / npairs(4) / match(4) - offset(4) pairs171 = 0xab = 15 ...............lookupswitch172 = 0xac = 0 ...............ireturn173 = 0xad = 0 ...............lreturn174 = 0xae = 0 ...............freturn175 = 0xaf = 0 ...............dreturn176 = 0xb0 = 0 ...............areturn177 = 0xb1 = 0 ...............return178 = 0xb2 = 6 ...............getstatic179 = 0xb3 = 6 ...............putstatic180 = 0xb4 = 6 ...............getfield181 = 0xb5 = 6 ...............putfield182 = 0xb6 = 6 ...............invokevirtual183 = 0xb7 = 6 ...............invokespecial184 = 0xb8 = 6 ...............invokestatic185 = 0xb9 = 7 ...............invokeinterface186 = 0xba = 8 ...............invokedynamic187 = 0xbb = 5 ...............new188 = 0xbc = 1 ...............newarray189 = 0xbd = 5 ...............anewarray190 = 0xbe = 0 ...............arraylength191 = 0xbf = 0 ...............athrow192 = 0xc0 = 5 ...............checkcast193 = 0xc1 = 5 ...............instanceof194 = 0xc2 = 0 ...............monitorenter195 = 0xc3 = 0 ...............monitorexit196 = 0xc4 = 17 ...............wide197 = 0xc5 = 16 ...............multianewarray198 = 0xc6 = 9 ...............ifnull199 = 0xc7 = 9 ...............ifnonnull#goto、jsr扩展指令200 = 0xc8 = 10 ...............goto_w201 = 0xc9 = 10 ...............jsr_w202 = 0xca = 9 Reserved opcodes:203 = 0xcb = 9 ...............breakpoint204 = 0xcc = 9 ...............impdep1205 = 0xcd = 9 ...............impdep2206 = 0xce = 9207 = 0xcf = 9208 = 0xd0 = 9209 = 0xd1 = 9210 = 0xd2 = 9211 = 0xd3 = 9212 = 0xd4 = 9213 = 0xd5 = 9214 = 0xd6 = 9215 = 0xd7 = 9216 = 0xd8 = 9217 = 0xd9 = 9218 = 0xda = 9219 = 0xdb = 9
?