1 package mockit.asm.jvmConstants;
2
3 /**
4 * Constant data about all <a href="https://docs.oracle.com/javase/specs/jvms/se11/html/jvms-6.html">JVM bytecode
5 * instructions</a>: {@link #SIZE}, {@link #TYPE}.
6 */
7 public final class JVMInstruction {
8 /**
9 * The stack size variation corresponding to each JVM instruction. Said variation equals the size of the values
10 * produced by an instruction, minus the size of the values consumed by the instruction.
11 */
12 public static final int[] SIZE;
13 static {
14 String s = "EFFFFFFFFGGFFFGGFFFEEFGFGFEEEEEEEEEEEEEEEEEEEEDEDEDDDDD"
15 + "CDCDEEEEEEEEEEEEEEEEEEEEBABABBBBDCFFFGGGEDCDCDCDCDCDCDCDCD"
16 + "CDCEEEEDDDDDDDCDCDCEFEFDDEEFFDEDEEEBDDBBDDDDDDCCCCCCCCEFED" + "DDCDCDEEEEEEEEEEFEEEEEEDDEEDDEE";
17 int n = s.length();
18 int[] sizes = new int[n];
19
20 for (int i = 0; i < n; i++) {
21 // noinspection CharUsedInArithmeticContext
22 sizes[i] = s.charAt(i) - 'E';
23 }
24
25 SIZE = sizes;
26 }
27
28 /**
29 * Constants that subdivide the 220 {@linkplain Opcodes instruction opcodes} in 18 types of instructions. Such types
30 * vary in the number and size of arguments the instruction takes (no argument, a signed byte, a signed short), on
31 * whether it takes a local variable index, a jump target label, etc. Some types contain a single instruction, such
32 * as LDC and IINC.
33 */
34 public interface InstructionType {
35 int NOARG = 0; // instructions without any argument
36 int SBYTE = 1; // instructions with a signed byte argument
37 int SHORT = 2; // instructions with a signed short argument
38 int VAR = 3; // instructions with a local variable index argument
39 int IMPLVAR = 4; // instructions with an implicit local variable index argument
40 int TYPE_INSN = 5; // instructions with a type descriptor argument
41 int FIELDORMETH = 6; // field and method invocations instructions
42 int ITFMETH = 7; // INVOKEINTERFACE/INVOKEDYNAMIC instruction
43 int INDYMETH = 8; // INVOKEDYNAMIC instruction
44 int LABEL = 9; // instructions with a 2 bytes bytecode offset label
45 int LABELW = 10; // instructions with a 4 bytes bytecode offset label
46 int LDC_INSN = 11; // the LDC instruction
47 int LDCW_INSN = 12; // the LDC_W and LDC2_W instructions
48 int IINC_INSN = 13; // the IINC instruction
49 int TABL_INSN = 14; // the TABLESWITCH instruction
50 int LOOK_INSN = 15; // the LOOKUPSWITCH instruction
51 int MANA_INSN = 16; // the MULTIANEWARRAY instruction
52 int WIDE_INSN = 17; // the WIDE instruction
53 }
54
55 /**
56 * The {@linkplain InstructionType instruction types} of all JVM opcodes, one value for each instruction opcode.
57 */
58 public static final byte[] TYPE;
59 static {
60 String s = "AAAAAAAAAAAAAAAABCLMMDDDDDEEEEEEEEEEEEEEEEEEEEAAAAAAAADD"
61 + "DDDEEEEEEEEEEEEEEEEEEEEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
62 + "AAAAAAAAAAAAAAAAANAAAAAAAAAAAAAAAAAAAAJJJJJJJJJJJJJJJJDOPAA"
63 + "AAAAGGGGGGGHIFBFAAFFAARQJJKKJJJJJJJJJJJJJJJJJJ";
64 int n = s.length();
65 byte[] types = new byte[n];
66
67 for (int i = 0; i < n; i++) {
68 // noinspection NumericCastThatLosesPrecision,CharUsedInArithmeticContext
69 types[i] = (byte) (s.charAt(i) - 'A');
70 }
71
72 TYPE = types;
73 }
74
75 private JVMInstruction() {
76 }
77 }