| /* |
| * ProGuard -- shrinking, optimization, obfuscation, and preverification |
| * of Java bytecode. |
| * |
| * Copyright (c) 2002-2014 Eric Lafortune (eric@graphics.cornell.edu) |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License as published by the Free |
| * Software Foundation; either version 2 of the License, or (at your option) |
| * any later version. |
| * |
| * This program 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 for |
| * more details. |
| * |
| * You should have received a copy of the GNU General Public License along |
| * with this program; if not, write to the Free Software Foundation, Inc., |
| * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| package proguard.classfile.instruction; |
| |
| /** |
| * This class provides methods to create and reuse Instruction objects. |
| * |
| * @author Eric Lafortune |
| */ |
| public class InstructionFactory |
| { |
| /** |
| * Creates a new Instruction from the data in the byte array, starting |
| * at the given index. |
| */ |
| public static Instruction create(byte[] code, int offset) |
| { |
| Instruction instruction; |
| |
| int index = offset; |
| byte opcode = code[index++]; |
| |
| boolean wide = false; |
| if (opcode == InstructionConstants.OP_WIDE) |
| { |
| opcode = code[index++]; |
| wide = true; |
| } |
| |
| switch (opcode) |
| { |
| // Simple instructions. |
| case InstructionConstants.OP_NOP: |
| case InstructionConstants.OP_ACONST_NULL: |
| case InstructionConstants.OP_ICONST_M1: |
| case InstructionConstants.OP_ICONST_0: |
| case InstructionConstants.OP_ICONST_1: |
| case InstructionConstants.OP_ICONST_2: |
| case InstructionConstants.OP_ICONST_3: |
| case InstructionConstants.OP_ICONST_4: |
| case InstructionConstants.OP_ICONST_5: |
| case InstructionConstants.OP_LCONST_0: |
| case InstructionConstants.OP_LCONST_1: |
| case InstructionConstants.OP_FCONST_0: |
| case InstructionConstants.OP_FCONST_1: |
| case InstructionConstants.OP_FCONST_2: |
| case InstructionConstants.OP_DCONST_0: |
| case InstructionConstants.OP_DCONST_1: |
| |
| case InstructionConstants.OP_BIPUSH: |
| case InstructionConstants.OP_SIPUSH: |
| |
| case InstructionConstants.OP_IALOAD: |
| case InstructionConstants.OP_LALOAD: |
| case InstructionConstants.OP_FALOAD: |
| case InstructionConstants.OP_DALOAD: |
| case InstructionConstants.OP_AALOAD: |
| case InstructionConstants.OP_BALOAD: |
| case InstructionConstants.OP_CALOAD: |
| case InstructionConstants.OP_SALOAD: |
| |
| case InstructionConstants.OP_IASTORE: |
| case InstructionConstants.OP_LASTORE: |
| case InstructionConstants.OP_FASTORE: |
| case InstructionConstants.OP_DASTORE: |
| case InstructionConstants.OP_AASTORE: |
| case InstructionConstants.OP_BASTORE: |
| case InstructionConstants.OP_CASTORE: |
| case InstructionConstants.OP_SASTORE: |
| case InstructionConstants.OP_POP: |
| case InstructionConstants.OP_POP2: |
| case InstructionConstants.OP_DUP: |
| case InstructionConstants.OP_DUP_X1: |
| case InstructionConstants.OP_DUP_X2: |
| case InstructionConstants.OP_DUP2: |
| case InstructionConstants.OP_DUP2_X1: |
| case InstructionConstants.OP_DUP2_X2: |
| case InstructionConstants.OP_SWAP: |
| case InstructionConstants.OP_IADD: |
| case InstructionConstants.OP_LADD: |
| case InstructionConstants.OP_FADD: |
| case InstructionConstants.OP_DADD: |
| case InstructionConstants.OP_ISUB: |
| case InstructionConstants.OP_LSUB: |
| case InstructionConstants.OP_FSUB: |
| case InstructionConstants.OP_DSUB: |
| case InstructionConstants.OP_IMUL: |
| case InstructionConstants.OP_LMUL: |
| case InstructionConstants.OP_FMUL: |
| case InstructionConstants.OP_DMUL: |
| case InstructionConstants.OP_IDIV: |
| case InstructionConstants.OP_LDIV: |
| case InstructionConstants.OP_FDIV: |
| case InstructionConstants.OP_DDIV: |
| case InstructionConstants.OP_IREM: |
| case InstructionConstants.OP_LREM: |
| case InstructionConstants.OP_FREM: |
| case InstructionConstants.OP_DREM: |
| case InstructionConstants.OP_INEG: |
| case InstructionConstants.OP_LNEG: |
| case InstructionConstants.OP_FNEG: |
| case InstructionConstants.OP_DNEG: |
| case InstructionConstants.OP_ISHL: |
| case InstructionConstants.OP_LSHL: |
| case InstructionConstants.OP_ISHR: |
| case InstructionConstants.OP_LSHR: |
| case InstructionConstants.OP_IUSHR: |
| case InstructionConstants.OP_LUSHR: |
| case InstructionConstants.OP_IAND: |
| case InstructionConstants.OP_LAND: |
| case InstructionConstants.OP_IOR: |
| case InstructionConstants.OP_LOR: |
| case InstructionConstants.OP_IXOR: |
| case InstructionConstants.OP_LXOR: |
| |
| case InstructionConstants.OP_I2L: |
| case InstructionConstants.OP_I2F: |
| case InstructionConstants.OP_I2D: |
| case InstructionConstants.OP_L2I: |
| case InstructionConstants.OP_L2F: |
| case InstructionConstants.OP_L2D: |
| case InstructionConstants.OP_F2I: |
| case InstructionConstants.OP_F2L: |
| case InstructionConstants.OP_F2D: |
| case InstructionConstants.OP_D2I: |
| case InstructionConstants.OP_D2L: |
| case InstructionConstants.OP_D2F: |
| case InstructionConstants.OP_I2B: |
| case InstructionConstants.OP_I2C: |
| case InstructionConstants.OP_I2S: |
| case InstructionConstants.OP_LCMP: |
| case InstructionConstants.OP_FCMPL: |
| case InstructionConstants.OP_FCMPG: |
| case InstructionConstants.OP_DCMPL: |
| case InstructionConstants.OP_DCMPG: |
| |
| case InstructionConstants.OP_IRETURN: |
| case InstructionConstants.OP_LRETURN: |
| case InstructionConstants.OP_FRETURN: |
| case InstructionConstants.OP_DRETURN: |
| case InstructionConstants.OP_ARETURN: |
| case InstructionConstants.OP_RETURN: |
| |
| case InstructionConstants.OP_NEWARRAY: |
| case InstructionConstants.OP_ARRAYLENGTH: |
| case InstructionConstants.OP_ATHROW: |
| |
| case InstructionConstants.OP_MONITORENTER: |
| case InstructionConstants.OP_MONITOREXIT: |
| instruction = new SimpleInstruction(); |
| break; |
| |
| // Instructions with a contant pool index. |
| case InstructionConstants.OP_LDC: |
| case InstructionConstants.OP_LDC_W: |
| case InstructionConstants.OP_LDC2_W: |
| |
| case InstructionConstants.OP_GETSTATIC: |
| case InstructionConstants.OP_PUTSTATIC: |
| case InstructionConstants.OP_GETFIELD: |
| case InstructionConstants.OP_PUTFIELD: |
| |
| case InstructionConstants.OP_INVOKEVIRTUAL: |
| case InstructionConstants.OP_INVOKESPECIAL: |
| case InstructionConstants.OP_INVOKESTATIC: |
| case InstructionConstants.OP_INVOKEINTERFACE: |
| case InstructionConstants.OP_INVOKEDYNAMIC: |
| |
| case InstructionConstants.OP_NEW: |
| case InstructionConstants.OP_ANEWARRAY: |
| case InstructionConstants.OP_CHECKCAST: |
| case InstructionConstants.OP_INSTANCEOF: |
| case InstructionConstants.OP_MULTIANEWARRAY: |
| instruction = new ConstantInstruction(); |
| break; |
| |
| // Instructions with a local variable index. |
| case InstructionConstants.OP_ILOAD: |
| case InstructionConstants.OP_LLOAD: |
| case InstructionConstants.OP_FLOAD: |
| case InstructionConstants.OP_DLOAD: |
| case InstructionConstants.OP_ALOAD: |
| case InstructionConstants.OP_ILOAD_0: |
| case InstructionConstants.OP_ILOAD_1: |
| case InstructionConstants.OP_ILOAD_2: |
| case InstructionConstants.OP_ILOAD_3: |
| case InstructionConstants.OP_LLOAD_0: |
| case InstructionConstants.OP_LLOAD_1: |
| case InstructionConstants.OP_LLOAD_2: |
| case InstructionConstants.OP_LLOAD_3: |
| case InstructionConstants.OP_FLOAD_0: |
| case InstructionConstants.OP_FLOAD_1: |
| case InstructionConstants.OP_FLOAD_2: |
| case InstructionConstants.OP_FLOAD_3: |
| case InstructionConstants.OP_DLOAD_0: |
| case InstructionConstants.OP_DLOAD_1: |
| case InstructionConstants.OP_DLOAD_2: |
| case InstructionConstants.OP_DLOAD_3: |
| case InstructionConstants.OP_ALOAD_0: |
| case InstructionConstants.OP_ALOAD_1: |
| case InstructionConstants.OP_ALOAD_2: |
| case InstructionConstants.OP_ALOAD_3: |
| |
| case InstructionConstants.OP_ISTORE: |
| case InstructionConstants.OP_LSTORE: |
| case InstructionConstants.OP_FSTORE: |
| case InstructionConstants.OP_DSTORE: |
| case InstructionConstants.OP_ASTORE: |
| case InstructionConstants.OP_ISTORE_0: |
| case InstructionConstants.OP_ISTORE_1: |
| case InstructionConstants.OP_ISTORE_2: |
| case InstructionConstants.OP_ISTORE_3: |
| case InstructionConstants.OP_LSTORE_0: |
| case InstructionConstants.OP_LSTORE_1: |
| case InstructionConstants.OP_LSTORE_2: |
| case InstructionConstants.OP_LSTORE_3: |
| case InstructionConstants.OP_FSTORE_0: |
| case InstructionConstants.OP_FSTORE_1: |
| case InstructionConstants.OP_FSTORE_2: |
| case InstructionConstants.OP_FSTORE_3: |
| case InstructionConstants.OP_DSTORE_0: |
| case InstructionConstants.OP_DSTORE_1: |
| case InstructionConstants.OP_DSTORE_2: |
| case InstructionConstants.OP_DSTORE_3: |
| case InstructionConstants.OP_ASTORE_0: |
| case InstructionConstants.OP_ASTORE_1: |
| case InstructionConstants.OP_ASTORE_2: |
| case InstructionConstants.OP_ASTORE_3: |
| |
| case InstructionConstants.OP_IINC: |
| |
| case InstructionConstants.OP_RET: |
| instruction = new VariableInstruction(wide); |
| break; |
| |
| // Instructions with a branch offset operand. |
| case InstructionConstants.OP_IFEQ: |
| case InstructionConstants.OP_IFNE: |
| case InstructionConstants.OP_IFLT: |
| case InstructionConstants.OP_IFGE: |
| case InstructionConstants.OP_IFGT: |
| case InstructionConstants.OP_IFLE: |
| case InstructionConstants.OP_IFICMPEQ: |
| case InstructionConstants.OP_IFICMPNE: |
| case InstructionConstants.OP_IFICMPLT: |
| case InstructionConstants.OP_IFICMPGE: |
| case InstructionConstants.OP_IFICMPGT: |
| case InstructionConstants.OP_IFICMPLE: |
| case InstructionConstants.OP_IFACMPEQ: |
| case InstructionConstants.OP_IFACMPNE: |
| case InstructionConstants.OP_GOTO: |
| case InstructionConstants.OP_JSR: |
| |
| case InstructionConstants.OP_IFNULL: |
| case InstructionConstants.OP_IFNONNULL: |
| |
| case InstructionConstants.OP_GOTO_W: |
| case InstructionConstants.OP_JSR_W: |
| instruction = new BranchInstruction(); |
| break; |
| |
| // The tableswitch instruction. |
| case InstructionConstants.OP_TABLESWITCH: |
| instruction = new TableSwitchInstruction(); |
| break; |
| |
| // The lookupswitch instruction. |
| case InstructionConstants.OP_LOOKUPSWITCH: |
| instruction = new LookUpSwitchInstruction(); |
| break; |
| |
| default: |
| throw new IllegalArgumentException("Unknown instruction opcode ["+opcode+"] at offset "+offset); |
| } |
| |
| instruction.opcode = opcode; |
| |
| instruction.readInfo(code, index); |
| |
| return instruction; |
| } |
| } |
