| Mnemonic | Opcode (in hex) | Opcode (in binary) | Other bytes | Stack[before]->[after] | Description |
|---|---|---|---|---|---|
| aaload | 32 | 0011 0010 | arrayref, index → value | load onto the stack a reference from an array | |
| aastore | 53 | 0101 0011 | arrayref, index, value → | store a reference in an array | |
| aconst_null | 01 | 0000 0001 | → null | push a null reference onto the stack | |
| aload | 19 | 0001 1001 | 1: index | → objectref | load a reference onto the stack from a local variable #index |
| aload_0 | 2a | 0010 1010 | → objectref | load a reference onto the stack from local variable 0 | |
| aload_1 | 2b | 0010 1011 | → objectref | load a reference onto the stack from local variable 1 | |
| aload_2 | 2c | 0010 1100 | → objectref | load a reference onto the stack from local variable 2 | |
| aload_3 | 2d | 0010 1101 | → objectref | load a reference onto the stack from local variable 3 | |
| anewarray | bd | 1011 1101 | 2: indexbyte1, indexbyte2 | count → arrayref | create a new array of references of length count and component type identified by the class reference index (indexbyte1 << 8 | indexbyte2) in the constant pool |
| areturn | b0 | 1011 0000 | objectref → [empty] | return a reference from a method | |
| arraylength | be | 1011 1110 | arrayref → length | get the length of an array | |
| astore | 3a | 0011 1010 | 1: index | objectref → | store a reference into a local variable #index |
| astore_0 | 4b | 0100 1011 | objectref → | store a reference into local variable 0 | |
| astore_1 | 4c | 0100 1100 | objectref → | store a reference into local variable 1 | |
| astore_2 | 4d | 0100 1101 | objectref → | store a reference into local variable 2 | |
| astore_3 | 4e | 0100 1110 | objectref → | store a reference into local variable 3 | |
| athrow | bf | 1011 1111 | objectref → [empty], objectref | throws an error or exception (notice that the rest of the stack is cleared, leaving only a reference to the Throwable) | |
| baload | 33 | 0011 0011 | arrayref, index → value | load a byte or Boolean value from an array | |
| bastore | 54 | 0101 0100 | arrayref, index, value → | store a byte or Boolean value into an array | |
| bipush | 10 | 0001 0000 | 1: byte | → value | push a byte onto the stack as an integer value |
| breakpoint | ca | 1100 1010 | reserved for breakpoints in Java debuggers; should not appear in any class file | ||
| caload | 34 | 0011 0100 | arrayref, index → value | load a char from an array | |
| castore | 55 | 0101 0101 | arrayref, index, value → | store a char into an array | |
| checkcast | c0 | 1100 0000 | 2: indexbyte1, indexbyte2 | objectref → objectref | checks whether an objectref is of a certain type, the class reference of which is in the constant pool at index (indexbyte1 << 8 | indexbyte2) |
| d2f | 90 | 1001 0000 | value → result | convert a double to a float | |
| d2i | 8e | 1000 1110 | value → result | convert a double to an int | |
| d2l | 8f | 1000 1111 | value → result | convert a double to a long | |
| dadd | 63 | 0110 0011 | value1, value2 → result | add two doubles | |
| daload | 31 | 0011 0001 | arrayref, index → value | load a double from an array | |
| dastore | 52 | 0101 0010 | arrayref, index, value → | store a double into an array | |
| dcmpg | 98 | 1001 1000 | value1, value2 → result | compare two doubles, 1 on NaN | |
| dcmpl | 97 | 1001 0111 | value1, value2 → result | compare two doubles, -1 on NaN | |
| dconst_0 | 0e | 0000 1110 | → 0.0 | push the constant 0.0 (a double) onto the stack | |
| dconst_1 | 0f | 0000 1111 | → 1.0 | push the constant 1.0 (a double) onto the stack | |
| ddiv | 6f | 0110 1111 | value1, value2 → result | divide two doubles | |
| dload | 18 | 0001 1000 | 1: index | → value | load a double value from a local variable #index |
| dload_0 | 26 | 0010 0110 | → value | load a double from local variable 0 | |
| dload_1 | 27 | 0010 0111 | → value | load a double from local variable 1 | |
| dload_2 | 28 | 0010 1000 | → value | load a double from local variable 2 | |
| dload_3 | 29 | 0010 1001 | → value | load a double from local variable 3 | |
| dmul | 6b | 0110 1011 | value1, value2 → result | multiply two doubles | |
| dneg | 77 | 0111 0111 | value → result | negate a double | |
| drem | 73 | 0111 0011 | value1, value2 → result | get the remainder from a division between two doubles | |
| dreturn | af | 1010 1111 | value → [empty] | return a double from a method | |
| dstore | 39 | 0011 1001 | 1: index | value → | store a double value into a local variable #index |
| dstore_0 | 47 | 0100 0111 | value → | store a double into local variable 0 | |
| dstore_1 | 48 | 0100 1000 | value → | store a double into local variable 1 | |
| dstore_2 | 49 | 0100 1001 | value → | store a double into local variable 2 | |
| dstore_3 | 4a | 0100 1010 | value → | store a double into local variable 3 | |
| dsub | 67 | 0110 0111 | value1, value2 → result | subtract a double from another | |
| dup | 59 | 0101 1001 | value → value, value | duplicate the value on top of the stack | |
| dup_x1 | 5a | 0101 1010 | value2, value1 → value1, value2, value1 | insert a copy of the top value into the stack two values from the top. value1 and value2 must not be of the type double or long. | |
| dup_x2 | 5b | 0101 1011 | value3, value2, value1 → value1, value3, value2, value1 | insert a copy of the top value into the stack two (if value2 is double or long it takes up the entry of value3, too) or three values (if value2 is neither double nor long) from the top | |
| dup2 | 5c | 0101 1100 | {value2, value1} → {value2, value1}, {value2, value1} | duplicate top two stack words (two values, if value1 is not double nor long; a single value, if value1 is double or long) | |
| dup2_x1 | 5d | 0101 1101 | value3, {value2, value1} → {value2, value1}, value3, {value2, value1} | duplicate two words and insert beneath third word (see explanation above) | |
| dup2_x2 | 5e | 0101 1110 | {value4, value3}, {value2, value1} → {value2, value1}, {value4, value3}, {value2, value1} | duplicate two words and insert beneath fourth word | |
| f2d | 8d | 1000 1101 | value → result | convert a float to a double | |
| f2i | 8b | 1000 1011 | value → result | convert a float to an int | |
| f2l | 8c | 1000 1100 | value → result | convert a float to a long | |
| fadd | 62 | 0110 0010 | value1, value2 → result | add two floats | |
| faload | 30 | 0011 0000 | arrayref, index → value | load a float from an array | |
| fastore | 51 | 0101 0001 | arrayref, index, value → | store a float in an array | |
| fcmpg | 96 | 1001 0110 | value1, value2 → result | compare two floats, 1 on NaN | |
| fcmpl | 95 | 1001 0101 | value1, value2 → result | compare two floats, -1 on NaN | |
| fconst_0 | 0b | 0000 1011 | → 0.0f | push 0.0f on the stack | |
| fconst_1 | 0c | 0000 1100 | → 1.0f | push 1.0f on the stack | |
| fconst_2 | 0d | 0000 1101 | → 2.0f | push 2.0f on the stack | |
| fdiv | 6e | 0110 1110 | value1, value2 → result | divide two floats | |
| fload | 17 | 0001 0111 | 1: index | → value | load a float value from a local variable #index |
| fload_0 | 22 | 0010 0010 | → value | load a float value from local variable 0 | |
| fload_1 | 23 | 0010 0011 | → value | load a float value from local variable 1 | |
| fload_2 | 24 | 0010 0100 | → value | load a float value from local variable 2 | |
| fload_3 | 25 | 0010 0101 | → value | load a float value from local variable 3 | |
| fmul | 6a | 0110 1010 | value1, value2 → result | multiply two floats | |
| fneg | 76 | 0111 0110 | value → result | negate a float | |
| frem | 72 | 0111 0010 | value1, value2 → result | get the remainder from a division between two floats | |
| freturn | ae | 1010 1110 | value → [empty] | return a float | |
| fstore | 38 | 0011 1000 | 1: index | value → | store a float value into a local variable #index |
| fstore_0 | 43 | 0100 0011 | value → | store a float value into local variable 0 | |
| fstore_1 | 44 | 0100 0100 | value → | store a float value into local variable 1 | |
| fstore_2 | 45 | 0100 0101 | value → | store a float value into local variable 2 | |
| fstore_3 | 46 | 0100 0110 | value → | store a float value into local variable 3 | |
| fsub | 66 | 0110 0110 | value1, value2 → result | subtract two floats | |
| getfield | b4 | 1011 0100 | 2: indexbyte1, indexbyte2 | objectref → value | get a field value of an object objectref, where the field is identified by field reference in the constant pool index (indexbyte1 << 8 | indexbyte2) |
| getstatic | b2 | 1011 0010 | 2: indexbyte1, indexbyte2 | → value | get a static field value of a class, where the field is identified by field reference in the constant pool index (indexbyte1 << 8 | indexbyte2) |
| goto | a7 | 1010 0111 | 2: branchbyte1, branchbyte2 | [no change] | goes to another instruction at branchoffset (signed short constructed from unsigned bytes branchbyte1 << 8 | branchbyte2) |
| goto_w | c8 | 1100 1000 | 4: branchbyte1, branchbyte2, branchbyte3, branchbyte4 | [no change] | goes to another instruction at branchoffset (signed int constructed from unsigned bytes branchbyte1 << 24 | branchbyte2 << 16 | branchbyte3 << 8 | branchbyte4) |
| i2b | 91 | 1001 0001 | value → result | convert an int into a byte | |
| i2c | 92 | 1001 0010 | value → result | convert an int into a character | |
| i2d | 87 | 1000 0111 | value → result | convert an int into a double | |
| i2f | 86 | 1000 0110 | value → result | convert an int into a float | |
| i2l | 85 | 1000 0101 | value → result | convert an int into a long | |
| i2s | 93 | 1001 0011 | value → result | convert an int into a short | |
| iadd | 60 | 0110 0000 | value1, value2 → result | add two ints | |
| iaload | 2e | 0010 1110 | arrayref, index → value | load an int from an array | |
| iand | 7e | 0111 1110 | value1, value2 → result | perform a bitwise AND on two integers | |
| iastore | 4f | 0100 1111 | arrayref, index, value → | store an int into an array | |
| iconst_m1 | 02 | 0000 0010 | → -1 | load the int value −1 onto the stack | |
| dup2_x2 | 5e | 0101 1110 | {value4, value3}, {value2, value1} → {value2, value1}, {value4, value3}, {value2, value1} | duplicate two words and insert beneath fourth word | |
| dup2 | 5c | 0101 1100 | {value2, value1} → {value2, value1}, {value2, value1} | duplicate top two stack words (two values, if value1 is not double nor long; a single value, if value1 is double or long) | |
| pop2 | 58 | 0101 1000 | {value2, value1} → | discard the top two values on the stack (or one value, if it is a double or long) | |
| wide | c4 | 1100 0100 | 3/5: opcode, indexbyte1, indexbyte2 or iinc, indexbyte1, indexbyte2, countbyte1, countbyte2 | [same as for corresponding instructions] | execute opcode, where opcode is either iload, fload, aload, lload, dload, istore, fstore, astore, lstore, dstore, or ret, but assume the index is 16 bit; or execute iinc, where the index is 16 bits and the constant to increment by is a signed 16 bit short |
| iinc | 84 | 1000 0100 | 2: index, const | [No change] | increment local variable #index by signed byte const |
| ret† | a9 | 1010 1001 | 1: index | [No change] | continue execution from address taken from a local variable #index (the asymmetry with jsr is intentional) |
| nop | 00 | 0000 0000 | [No change] | perform no operation | |
| goto_w | c8 | 1100 1000 | 4: branchbyte1, branchbyte2, branchbyte3, branchbyte4 | [no change] | goes to another instruction at branchoffset (signed int constructed from unsigned bytes branchbyte1 << 24 | branchbyte2 << 16 | branchbyte3 << 8 | branchbyte4) |
| goto | a7 | 1010 0111 | 2: branchbyte1, branchbyte2 | [no change] | goes to another instruction at branchoffset (signed short constructed from unsigned bytes branchbyte1 << 8 | branchbyte2) |
| invokedynamic | ba | 1011 1010 | 4: indexbyte1, indexbyte2, 0, 0 | [arg1, arg2, ...] → result | invokes a dynamic method and puts the result on the stack (might be void); the method is identified by method reference index in constant pool (indexbyte1 << 8 | indexbyte2) |
| invokestatic | b8 | 1011 1000 | 2: indexbyte1, indexbyte2 | [arg1, arg2, ...] → result | invoke a static method and puts the result on the stack (might be void); the method is identified by method reference index in constant pool (indexbyte1 << 8 | indexbyte2) |
| breakpoint | ca | 1100 1010 | reserved for breakpoints in Java debuggers; should not appear in any class file | ||
| impdep1 | fe | 1111 1110 | reserved for implementation-dependent operations within debuggers; should not appear in any class file | ||
| impdep2 | ff | 1111 1111 | reserved for implementation-dependent operations within debuggers; should not appear in any class file | ||
| (no name) | cb-fd | these values are currently unassigned for opcodes and are reserved for future use |
原文:https://en.wikipedia.org/wiki/List_of_Java_bytecode_instructions
