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ProGuardCORE is a free library to read, analyze, modify, and write Java class files.
/*
* ProGuardCORE -- library to process Java bytecode.
*
* Copyright (c) 2002-2020 Guardsquare NV
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package proguard.classfile.instruction;
/**
* This class provides methods to create and reuse Instruction instances.
*
* @author Eric Lafortune
*/
public class InstructionFactory
{
/**
* Creates a new Instruction from the data in the byte array, starting
* at the given offset.
*/
public static Instruction create(byte[] code, int offset)
{
int index = offset;
byte opcode = code[index++];
boolean wide = false;
if (opcode == Instruction.OP_WIDE)
{
opcode = code[index++];
wide = true;
}
Instruction instruction = create(opcode, wide);
instruction.opcode = opcode;
instruction.readInfo(code, index);
return instruction;
}
/**
* Creates a new Instruction corresponding to the given opcode.
*/
public static Instruction create(byte opcode)
{
Instruction instruction = create(opcode, false);
instruction.opcode = opcode;
return instruction;
}
/**
* Creates a new Instruction corresponding to the given opcode.
*/
public static Instruction create(byte opcode, boolean wide)
{
switch (opcode)
{
// Simple instructions.
case Instruction.OP_NOP:
case Instruction.OP_ACONST_NULL:
case Instruction.OP_ICONST_M1:
case Instruction.OP_ICONST_0:
case Instruction.OP_ICONST_1:
case Instruction.OP_ICONST_2:
case Instruction.OP_ICONST_3:
case Instruction.OP_ICONST_4:
case Instruction.OP_ICONST_5:
case Instruction.OP_LCONST_0:
case Instruction.OP_LCONST_1:
case Instruction.OP_FCONST_0:
case Instruction.OP_FCONST_1:
case Instruction.OP_FCONST_2:
case Instruction.OP_DCONST_0:
case Instruction.OP_DCONST_1:
case Instruction.OP_BIPUSH:
case Instruction.OP_SIPUSH:
case Instruction.OP_IALOAD:
case Instruction.OP_LALOAD:
case Instruction.OP_FALOAD:
case Instruction.OP_DALOAD:
case Instruction.OP_AALOAD:
case Instruction.OP_BALOAD:
case Instruction.OP_CALOAD:
case Instruction.OP_SALOAD:
case Instruction.OP_IASTORE:
case Instruction.OP_LASTORE:
case Instruction.OP_FASTORE:
case Instruction.OP_DASTORE:
case Instruction.OP_AASTORE:
case Instruction.OP_BASTORE:
case Instruction.OP_CASTORE:
case Instruction.OP_SASTORE:
case Instruction.OP_POP:
case Instruction.OP_POP2:
case Instruction.OP_DUP:
case Instruction.OP_DUP_X1:
case Instruction.OP_DUP_X2:
case Instruction.OP_DUP2:
case Instruction.OP_DUP2_X1:
case Instruction.OP_DUP2_X2:
case Instruction.OP_SWAP:
case Instruction.OP_IADD:
case Instruction.OP_LADD:
case Instruction.OP_FADD:
case Instruction.OP_DADD:
case Instruction.OP_ISUB:
case Instruction.OP_LSUB:
case Instruction.OP_FSUB:
case Instruction.OP_DSUB:
case Instruction.OP_IMUL:
case Instruction.OP_LMUL:
case Instruction.OP_FMUL:
case Instruction.OP_DMUL:
case Instruction.OP_IDIV:
case Instruction.OP_LDIV:
case Instruction.OP_FDIV:
case Instruction.OP_DDIV:
case Instruction.OP_IREM:
case Instruction.OP_LREM:
case Instruction.OP_FREM:
case Instruction.OP_DREM:
case Instruction.OP_INEG:
case Instruction.OP_LNEG:
case Instruction.OP_FNEG:
case Instruction.OP_DNEG:
case Instruction.OP_ISHL:
case Instruction.OP_LSHL:
case Instruction.OP_ISHR:
case Instruction.OP_LSHR:
case Instruction.OP_IUSHR:
case Instruction.OP_LUSHR:
case Instruction.OP_IAND:
case Instruction.OP_LAND:
case Instruction.OP_IOR:
case Instruction.OP_LOR:
case Instruction.OP_IXOR:
case Instruction.OP_LXOR:
case Instruction.OP_I2L:
case Instruction.OP_I2F:
case Instruction.OP_I2D:
case Instruction.OP_L2I:
case Instruction.OP_L2F:
case Instruction.OP_L2D:
case Instruction.OP_F2I:
case Instruction.OP_F2L:
case Instruction.OP_F2D:
case Instruction.OP_D2I:
case Instruction.OP_D2L:
case Instruction.OP_D2F:
case Instruction.OP_I2B:
case Instruction.OP_I2C:
case Instruction.OP_I2S:
case Instruction.OP_LCMP:
case Instruction.OP_FCMPL:
case Instruction.OP_FCMPG:
case Instruction.OP_DCMPL:
case Instruction.OP_DCMPG:
case Instruction.OP_IRETURN:
case Instruction.OP_LRETURN:
case Instruction.OP_FRETURN:
case Instruction.OP_DRETURN:
case Instruction.OP_ARETURN:
case Instruction.OP_RETURN:
case Instruction.OP_NEWARRAY:
case Instruction.OP_ARRAYLENGTH:
case Instruction.OP_ATHROW:
case Instruction.OP_MONITORENTER:
case Instruction.OP_MONITOREXIT:
return new SimpleInstruction();
// Instructions with a contant pool index.
case Instruction.OP_LDC:
case Instruction.OP_LDC_W:
case Instruction.OP_LDC2_W:
case Instruction.OP_GETSTATIC:
case Instruction.OP_PUTSTATIC:
case Instruction.OP_GETFIELD:
case Instruction.OP_PUTFIELD:
case Instruction.OP_INVOKEVIRTUAL:
case Instruction.OP_INVOKESPECIAL:
case Instruction.OP_INVOKESTATIC:
case Instruction.OP_INVOKEINTERFACE:
case Instruction.OP_INVOKEDYNAMIC:
case Instruction.OP_NEW:
case Instruction.OP_ANEWARRAY:
case Instruction.OP_CHECKCAST:
case Instruction.OP_INSTANCEOF:
case Instruction.OP_MULTIANEWARRAY:
return new ConstantInstruction();
// Instructions with a local variable index.
case Instruction.OP_ILOAD:
case Instruction.OP_LLOAD:
case Instruction.OP_FLOAD:
case Instruction.OP_DLOAD:
case Instruction.OP_ALOAD:
case Instruction.OP_ILOAD_0:
case Instruction.OP_ILOAD_1:
case Instruction.OP_ILOAD_2:
case Instruction.OP_ILOAD_3:
case Instruction.OP_LLOAD_0:
case Instruction.OP_LLOAD_1:
case Instruction.OP_LLOAD_2:
case Instruction.OP_LLOAD_3:
case Instruction.OP_FLOAD_0:
case Instruction.OP_FLOAD_1:
case Instruction.OP_FLOAD_2:
case Instruction.OP_FLOAD_3:
case Instruction.OP_DLOAD_0:
case Instruction.OP_DLOAD_1:
case Instruction.OP_DLOAD_2:
case Instruction.OP_DLOAD_3:
case Instruction.OP_ALOAD_0:
case Instruction.OP_ALOAD_1:
case Instruction.OP_ALOAD_2:
case Instruction.OP_ALOAD_3:
case Instruction.OP_ISTORE:
case Instruction.OP_LSTORE:
case Instruction.OP_FSTORE:
case Instruction.OP_DSTORE:
case Instruction.OP_ASTORE:
case Instruction.OP_ISTORE_0:
case Instruction.OP_ISTORE_1:
case Instruction.OP_ISTORE_2:
case Instruction.OP_ISTORE_3:
case Instruction.OP_LSTORE_0:
case Instruction.OP_LSTORE_1:
case Instruction.OP_LSTORE_2:
case Instruction.OP_LSTORE_3:
case Instruction.OP_FSTORE_0:
case Instruction.OP_FSTORE_1:
case Instruction.OP_FSTORE_2:
case Instruction.OP_FSTORE_3:
case Instruction.OP_DSTORE_0:
case Instruction.OP_DSTORE_1:
case Instruction.OP_DSTORE_2:
case Instruction.OP_DSTORE_3:
case Instruction.OP_ASTORE_0:
case Instruction.OP_ASTORE_1:
case Instruction.OP_ASTORE_2:
case Instruction.OP_ASTORE_3:
case Instruction.OP_IINC:
case Instruction.OP_RET:
return new VariableInstruction(wide);
// Instructions with a branch offset operand.
case Instruction.OP_IFEQ:
case Instruction.OP_IFNE:
case Instruction.OP_IFLT:
case Instruction.OP_IFGE:
case Instruction.OP_IFGT:
case Instruction.OP_IFLE:
case Instruction.OP_IFICMPEQ:
case Instruction.OP_IFICMPNE:
case Instruction.OP_IFICMPLT:
case Instruction.OP_IFICMPGE:
case Instruction.OP_IFICMPGT:
case Instruction.OP_IFICMPLE:
case Instruction.OP_IFACMPEQ:
case Instruction.OP_IFACMPNE:
case Instruction.OP_GOTO:
case Instruction.OP_JSR:
case Instruction.OP_IFNULL:
case Instruction.OP_IFNONNULL:
case Instruction.OP_GOTO_W:
case Instruction.OP_JSR_W:
return new BranchInstruction();
// The tableswitch instruction.
case Instruction.OP_TABLESWITCH:
return new TableSwitchInstruction();
// The lookupswitch instruction.
case Instruction.OP_LOOKUPSWITCH:
return new LookUpSwitchInstruction();
default:
throw new IllegalArgumentException("Unknown instruction opcode ["+opcode+"]");
}
}
}
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