/*
 *    Fernflower - The Analytical Java Decompiler
 *    http://www.reversed-java.com
 *
 *    (C) 2008 - 2010, Stiver
 *
 *    This software is NEITHER public domain NOR free software 
 *    as per GNU License. See license.txt for more details.
 *
 *    This software is distributed WITHOUT ANY WARRANTY; without 
 *    even the implied warranty of MERCHANTABILITY or FITNESS FOR 
 *    A PARTICULAR PURPOSE. 
 */

package org.jetbrains.java.decompiler.code.interpreter;

import org.jetbrains.java.decompiler.code.CodeConstants;
import org.jetbrains.java.decompiler.code.Instruction;
import org.jetbrains.java.decompiler.struct.consts.ConstantPool;
import org.jetbrains.java.decompiler.struct.consts.LinkConstant;
import org.jetbrains.java.decompiler.struct.consts.PrimitiveConstant;
import org.jetbrains.java.decompiler.struct.gen.DataPoint;
import org.jetbrains.java.decompiler.struct.gen.MethodDescriptor;
import org.jetbrains.java.decompiler.struct.gen.VarType;
import org.jetbrains.java.decompiler.util.ListStack;

public class InstructionImpact {
	
	// {read, write}
	private static final int[][][] stack_impact = {
		
		{null,null},						//		public final static int		opc_nop = 0;	
		null,								//		public final static int		opc_aconst_null = 1;
		null, 								//		public final static int		opc_iconst_m1 = 2;   
		null, 								//		public final static int		opc_iconst_0 = 3;    
		null, 								//		public final static int		opc_iconst_1 = 4;    
		null, 								//		public final static int		opc_iconst_2 = 5;    
		null, 			//		public final static int		opc_iconst_3 = 6;    
		null, 			//		public final static int		opc_iconst_4 = 7;	 
		null, 			//		public final static int		opc_iconst_5 = 8;    
		{null,{CodeConstants.TYPE_LONG}}, 			//		public final static int		opc_lconst_0 = 9;    
		{null,{CodeConstants.TYPE_LONG}}, 			//		public final static int		opc_lconst_1 = 10;    
		{null,{CodeConstants.TYPE_FLOAT}},			//		public final static int		opc_fconst_0 = 11;    
		{null,{CodeConstants.TYPE_FLOAT}},			//		public final static int		opc_fconst_1 = 12;    
		{null,{CodeConstants.TYPE_FLOAT}},			//		public final static int		opc_fconst_2 = 13;    
		{null,{CodeConstants.TYPE_DOUBLE}},			//		public final static int		opc_dconst_0 = 14;    
		{null,{CodeConstants.TYPE_DOUBLE}},			//		public final static int		opc_dconst_1 = 15;    
		{null,{CodeConstants.TYPE_INT}},			//		public final static int		opc_bipush = 16;	
		{null,{CodeConstants.TYPE_INT}},			//		public final static int		opc_sipush = 17;	
		null, 			//		public final static int		opc_ldc = 18;		
		null, 			//		public final static int		opc_ldc_w = 19;		
		null, 			//		public final static int		opc_ldc2_w = 20;	
		{null,{CodeConstants.TYPE_INT}},			//		public final static int		opc_iload = 21;		
		{null,{CodeConstants.TYPE_LONG}},			//		public final static int		opc_lload = 22;		
		{null,{CodeConstants.TYPE_FLOAT}},			//		public final static int		opc_fload = 23;		
		{null,{CodeConstants.TYPE_DOUBLE}},			//		public final static int		opc_dload = 24;		
		null,			//		public final static int		opc_aload = 25;		
		null, 			//		public final static int		opc_iload_0 = 26;		
		null, 			//		public final static int		opc_iload_1 = 27;		
		null, 			//		public final static int		opc_iload_2 = 28;		
		null, 			//		public final static int		opc_iload_3 = 29;		
		null, 			//		public final static int		opc_lload_0 = 30;		
		null, 			//		public final static int		opc_lload_1 = 31;		
		null, 			//		public final static int		opc_lload_2 = 32;		
		null, 			//		public final static int		opc_lload_3 = 33;		
		null, 			//		public final static int		opc_fload_0 = 34;		
		null, 			//		public final static int		opc_fload_1 = 35;		
		null, 			//		public final static int		opc_fload_2 = 36;		
		null, 			//		public final static int		opc_fload_3 = 37;		
		null, 			//		public final static int		opc_dload_0 = 38;		
		null, 			//		public final static int		opc_dload_1 = 39;		
		null, 			//		public final static int		opc_dload_2 = 40;		
		null, 			//		public final static int		opc_dload_3 = 41;		
		null, 			//		public final static int		opc_aload_0 = 42;		
		null, 			//		public final static int		opc_aload_1 = 43;		
		null, 			//		public final static int		opc_aload_2 = 44;		
		null, 			//		public final static int		opc_aload_3 = 45;		
		{{CodeConstants.TYPE_OBJECT, CodeConstants.TYPE_INT},{CodeConstants.TYPE_INT}},			//		public final static int		opc_iaload = 46;		
		{{CodeConstants.TYPE_OBJECT, CodeConstants.TYPE_INT},{CodeConstants.TYPE_LONG}},			//		public final static int		opc_laload = 47;		
		{{CodeConstants.TYPE_OBJECT, CodeConstants.TYPE_INT},{CodeConstants.TYPE_FLOAT}},			//		public final static int		opc_faload = 48;		
		{{CodeConstants.TYPE_OBJECT, CodeConstants.TYPE_INT},{CodeConstants.TYPE_DOUBLE}},			//		public final static int		opc_daload = 49;		
		null,			//		public final static int		opc_aaload = 50;		
		{{CodeConstants.TYPE_OBJECT, CodeConstants.TYPE_INT},{CodeConstants.TYPE_INT}},			//		public final static int		opc_baload = 51;		
		{{CodeConstants.TYPE_OBJECT, CodeConstants.TYPE_INT},{CodeConstants.TYPE_INT}},			//		public final static int		opc_caload = 52;		
		{{CodeConstants.TYPE_OBJECT, CodeConstants.TYPE_INT},{CodeConstants.TYPE_INT}},			//		public final static int		opc_saload = 53;		
		{{CodeConstants.TYPE_INT},null},			//		public final static int		opc_istore = 54;		
		{{CodeConstants.TYPE_LONG},null},			//		public final static int		opc_lstore = 55;		
		{{CodeConstants.TYPE_FLOAT},null},			//		public final static int		opc_fstore = 56;		
		{{CodeConstants.TYPE_DOUBLE},null},			//		public final static int		opc_dstore = 57;		
		null,			//		public final static int		opc_astore = 58;		
		null, 			//		public final static int		opc_istore_0 = 59;		
		null, 			//		public final static int		opc_istore_1 = 60;		
		null, 			//		public final static int		opc_istore_2 = 61;		
		null, 			//		public final static int		opc_istore_3 = 62;		
		null, 			//		public final static int		opc_lstore_0 = 63;		
		null, 			//		public final static int		opc_lstore_1 = 64;		
		null, 			//		public final static int		opc_lstore_2 = 65;		
		null, 			//		public final static int		opc_lstore_3 = 66;		
		null, 			//		public final static int		opc_fstore_0 = 67;		
		null, 			//		public final static int		opc_fstore_1 = 68;		
		null, 			//		public final static int		opc_fstore_2 = 69;		
		null, 			//		public final static int		opc_fstore_3 = 70;		
		null, 			//		public final static int		opc_dstore_0 = 71;		
		null, 			//		public final static int		opc_dstore_1 = 72;		
		null, 			//		public final static int		opc_dstore_2 = 73;		
		null, 			//		public final static int		opc_dstore_3 = 74;		
		null, 			//		public final static int		opc_astore_0 = 75;		
		null, 			//		public final static int		opc_astore_1 = 76;		
		null, 			//		public final static int		opc_astore_2 = 77;		
		null, 			//		public final static int		opc_astore_3 = 78;		
		{{CodeConstants.TYPE_OBJECT, CodeConstants.TYPE_INT,CodeConstants.TYPE_INT},null},			//		public final static int		opc_iastore = 79;		
		{{CodeConstants.TYPE_OBJECT, CodeConstants.TYPE_INT,CodeConstants.TYPE_LONG},null},			//		public final static int		opc_lastore = 80;		
		{{CodeConstants.TYPE_OBJECT, CodeConstants.TYPE_INT,CodeConstants.TYPE_FLOAT},null},			//		public final static int		opc_fastore = 81;		
		{{CodeConstants.TYPE_OBJECT, CodeConstants.TYPE_INT,CodeConstants.TYPE_DOUBLE},null},			//		public final static int		opc_dastore = 82;		
		{{CodeConstants.TYPE_OBJECT, CodeConstants.TYPE_INT,CodeConstants.TYPE_OBJECT},null},			//		public final static int		opc_aastore = 83;		
		{{CodeConstants.TYPE_OBJECT, CodeConstants.TYPE_INT,CodeConstants.TYPE_INT},null},			//		public final static int		opc_bastore = 84;		
		{{CodeConstants.TYPE_OBJECT, CodeConstants.TYPE_INT,CodeConstants.TYPE_INT},null},			//		public final static int		opc_castore = 85;		
		{{CodeConstants.TYPE_OBJECT, CodeConstants.TYPE_INT,CodeConstants.TYPE_INT},null},			//		public final static int		opc_sastore = 86;		
		{{CodeConstants.TYPE_ANY},null},			//		public final static int		opc_pop = 87;		
		{{CodeConstants.TYPE_ANY, CodeConstants.TYPE_ANY},null},			//		public final static int		opc_pop2 = 88;		
		null, 			//		public final static int		opc_dup = 89;		
		null, 			//		public final static int		opc_dup_x1 = 90;		
		null, 			//		public final static int		opc_dup_x2 = 91;		
		null, 			//		public final static int		opc_dup2 = 92;		
		null, 			//		public final static int		opc_dup2_x1 = 93;		
		null, 			//		public final static int		opc_dup2_x2 = 94;		
		null, 			//		public final static int		opc_swap = 95;		
		{{CodeConstants.TYPE_INT, CodeConstants.TYPE_INT},{CodeConstants.TYPE_INT}},			//		public final static int		opc_iadd = 96;		
		{{CodeConstants.TYPE_LONG, CodeConstants.TYPE_LONG},{CodeConstants.TYPE_LONG}},			//		public final static int		opc_ladd = 97;		
		{{CodeConstants.TYPE_FLOAT, CodeConstants.TYPE_FLOAT},{CodeConstants.TYPE_FLOAT}},			//		public final static int		opc_fadd = 98;		
		{{CodeConstants.TYPE_DOUBLE, CodeConstants.TYPE_DOUBLE},{CodeConstants.TYPE_DOUBLE}},			//		public final static int		opc_dadd = 99;		
		{{CodeConstants.TYPE_INT, CodeConstants.TYPE_INT},{CodeConstants.TYPE_INT}},			//		public final static int		opc_isub = 100;		
		{{CodeConstants.TYPE_LONG, CodeConstants.TYPE_LONG},{CodeConstants.TYPE_LONG}},			//		public final static int		opc_lsub = 101;		
		{{CodeConstants.TYPE_FLOAT, CodeConstants.TYPE_FLOAT},{CodeConstants.TYPE_FLOAT}},			//		public final static int		opc_fsub = 102;		
		{{CodeConstants.TYPE_DOUBLE, CodeConstants.TYPE_DOUBLE},{CodeConstants.TYPE_DOUBLE}},			//		public final static int		opc_dsub = 103;		
		{{CodeConstants.TYPE_INT, CodeConstants.TYPE_INT},{CodeConstants.TYPE_INT}},			//		public final static int		opc_imul = 104;		
		{{CodeConstants.TYPE_LONG, CodeConstants.TYPE_LONG},{CodeConstants.TYPE_LONG}},			//		public final static int		opc_lmul = 105;		
		{{CodeConstants.TYPE_FLOAT, CodeConstants.TYPE_FLOAT},{CodeConstants.TYPE_FLOAT}},			//		public final static int		opc_fmul = 106;		
		{{CodeConstants.TYPE_DOUBLE, CodeConstants.TYPE_DOUBLE},{CodeConstants.TYPE_DOUBLE}},			//		public final static int		opc_dmul = 107;		
		{{CodeConstants.TYPE_INT, CodeConstants.TYPE_INT},{CodeConstants.TYPE_INT}},			//		public final static int		opc_idiv = 108;		
		{{CodeConstants.TYPE_LONG, CodeConstants.TYPE_LONG},{CodeConstants.TYPE_LONG}},			//		public final static int		opc_ldiv = 109;		
		{{CodeConstants.TYPE_FLOAT, CodeConstants.TYPE_FLOAT},{CodeConstants.TYPE_FLOAT}},			//		public final static int		opc_fdiv = 110;		
		{{CodeConstants.TYPE_DOUBLE, CodeConstants.TYPE_DOUBLE},{CodeConstants.TYPE_DOUBLE}},			//		public final static int		opc_ddiv = 111;		
		{{CodeConstants.TYPE_INT, CodeConstants.TYPE_INT},{CodeConstants.TYPE_INT}},			//		public final static int		opc_irem = 112;		
		{{CodeConstants.TYPE_LONG, CodeConstants.TYPE_LONG},{CodeConstants.TYPE_LONG}},			//		public final static int		opc_lrem = 113;		
		{{CodeConstants.TYPE_FLOAT, CodeConstants.TYPE_FLOAT},{CodeConstants.TYPE_FLOAT}},			//		public final static int		opc_frem = 114;		
		{{CodeConstants.TYPE_DOUBLE, CodeConstants.TYPE_DOUBLE},{CodeConstants.TYPE_DOUBLE}},			//		public final static int		opc_drem = 115;		
		{{CodeConstants.TYPE_INT},{CodeConstants.TYPE_INT}},			//		public final static int		opc_ineg = 116;		
		{{CodeConstants.TYPE_LONG},{CodeConstants.TYPE_LONG}},			//		public final static int		opc_lneg = 117;		
		{{CodeConstants.TYPE_FLOAT},{CodeConstants.TYPE_FLOAT}},			//		public final static int		opc_fneg = 118;		
		{{CodeConstants.TYPE_DOUBLE},{CodeConstants.TYPE_DOUBLE}},			//		public final static int		opc_dneg = 119;		
		{{CodeConstants.TYPE_INT, CodeConstants.TYPE_INT},{CodeConstants.TYPE_INT}},			//		public final static int		opc_ishl = 120;		
		{{CodeConstants.TYPE_LONG, CodeConstants.TYPE_INT},{CodeConstants.TYPE_LONG}},			//		public final static int		opc_lshl = 121;		
		{{CodeConstants.TYPE_INT, CodeConstants.TYPE_INT},{CodeConstants.TYPE_INT}},			//		public final static int		opc_ishr = 122;		
		{{CodeConstants.TYPE_LONG, CodeConstants.TYPE_INT},{CodeConstants.TYPE_LONG}},			//		public final static int		opc_lshr = 123;		
		{{CodeConstants.TYPE_INT, CodeConstants.TYPE_INT},{CodeConstants.TYPE_INT}},			//		public final static int		opc_iushr = 124;		
		{{CodeConstants.TYPE_LONG, CodeConstants.TYPE_INT},{CodeConstants.TYPE_LONG}},			//		public final static int		opc_lushr = 125;		
		{{CodeConstants.TYPE_INT, CodeConstants.TYPE_INT},{CodeConstants.TYPE_INT}},			//		public final static int		opc_iand = 126;		
		{{CodeConstants.TYPE_LONG, CodeConstants.TYPE_LONG},{CodeConstants.TYPE_LONG}},			//		public final static int		opc_land = 127;		
		{{CodeConstants.TYPE_INT, CodeConstants.TYPE_INT},{CodeConstants.TYPE_INT}},			//		public final static int		opc_ior = 128;		
		{{CodeConstants.TYPE_LONG, CodeConstants.TYPE_LONG},{CodeConstants.TYPE_LONG}},			//		public final static int		opc_lor = 129;		
		{{CodeConstants.TYPE_INT, CodeConstants.TYPE_INT},{CodeConstants.TYPE_INT}},			//		public final static int		opc_ixor = 130;		
		{{CodeConstants.TYPE_LONG, CodeConstants.TYPE_LONG},{CodeConstants.TYPE_LONG}},			//		public final static int		opc_lxor = 131;		
		{null,null},			//		public final static int		opc_iinc = 132;		
		{{CodeConstants.TYPE_INT},{CodeConstants.TYPE_LONG}},			//		public final static int		opc_i2l = 133;		
		{{CodeConstants.TYPE_INT},{CodeConstants.TYPE_FLOAT}},			//		public final static int		opc_i2f = 134;		
		{{CodeConstants.TYPE_INT},{CodeConstants.TYPE_DOUBLE}},			//		public final static int		opc_i2d = 135;		
		{{CodeConstants.TYPE_LONG},{CodeConstants.TYPE_INT}},			//		public final static int		opc_l2i = 136;		
		{{CodeConstants.TYPE_LONG},{CodeConstants.TYPE_FLOAT}},			//		public final static int		opc_l2f = 137;		
		{{CodeConstants.TYPE_LONG},{CodeConstants.TYPE_DOUBLE}},			//		public final static int		opc_l2d = 138;		
		{{CodeConstants.TYPE_FLOAT},{CodeConstants.TYPE_INT}},			//		public final static int		opc_f2i = 139;		
		{{CodeConstants.TYPE_FLOAT},{CodeConstants.TYPE_LONG}},			//		public final static int		opc_f2l = 140;		
		{{CodeConstants.TYPE_FLOAT},{CodeConstants.TYPE_DOUBLE}},			//		public final static int		opc_f2d = 141;		
		{{CodeConstants.TYPE_DOUBLE},{CodeConstants.TYPE_INT}},			//		public final static int		opc_d2i = 142;		
		{{CodeConstants.TYPE_DOUBLE},{CodeConstants.TYPE_LONG}},			//		public final static int		opc_d2l = 143;		
		{{CodeConstants.TYPE_DOUBLE},{CodeConstants.TYPE_FLOAT}},			//		public final static int		opc_d2f = 144;		
		{{CodeConstants.TYPE_INT},{CodeConstants.TYPE_INT}},			//		public final static int		opc_i2b = 145;		
		{{CodeConstants.TYPE_INT},{CodeConstants.TYPE_INT}},			//		public final static int		opc_i2c = 146;		
		{{CodeConstants.TYPE_INT},{CodeConstants.TYPE_INT}},			//		public final static int		opc_i2s = 147;		
		{{CodeConstants.TYPE_LONG, CodeConstants.TYPE_LONG},{CodeConstants.TYPE_INT}},			//		public final static int		opc_lcmp = 148;		
		{{CodeConstants.TYPE_FLOAT, CodeConstants.TYPE_FLOAT},{CodeConstants.TYPE_INT}},			//		public final static int		opc_fcmpl = 149;		
		{{CodeConstants.TYPE_FLOAT, CodeConstants.TYPE_FLOAT},{CodeConstants.TYPE_INT}},			//		public final static int		opc_fcmpg = 150;		
		{{CodeConstants.TYPE_DOUBLE, CodeConstants.TYPE_DOUBLE},{CodeConstants.TYPE_INT}},			//		public final static int		opc_dcmpl = 151;		
		{{CodeConstants.TYPE_DOUBLE, CodeConstants.TYPE_DOUBLE},{CodeConstants.TYPE_INT}},			//		public final static int		opc_dcmpg = 152;		
		{{CodeConstants.TYPE_INT},null},			//		public final static int		opc_ifeq = 153;		
		{{CodeConstants.TYPE_INT},null},			//		public final static int		opc_ifne = 154;		
		{{CodeConstants.TYPE_INT},null},			//		public final static int		opc_iflt = 155;		
		{{CodeConstants.TYPE_INT},null},			//		public final static int		opc_ifge = 156;		
		{{CodeConstants.TYPE_INT},null},			//		public final static int		opc_ifgt = 157;		
		{{CodeConstants.TYPE_INT},null},			//		public final static int		opc_ifle = 158;		
		{{CodeConstants.TYPE_INT, CodeConstants.TYPE_INT},null},			//		public final static int		opc_if_icmpeq = 159;		
		{{CodeConstants.TYPE_INT, CodeConstants.TYPE_INT},null},			//		public final static int		opc_if_icmpne = 160;		
		{{CodeConstants.TYPE_INT, CodeConstants.TYPE_INT},null},			//		public final static int		opc_if_icmplt = 161;		
		{{CodeConstants.TYPE_INT, CodeConstants.TYPE_INT},null},			//		public final static int		opc_if_icmpge = 162;		
		{{CodeConstants.TYPE_INT, CodeConstants.TYPE_INT},null},			//		public final static int		opc_if_icmpgt = 163;		
		{{CodeConstants.TYPE_INT, CodeConstants.TYPE_INT},null},			//		public final static int		opc_if_icmple = 164;		
		{{CodeConstants.TYPE_OBJECT, CodeConstants.TYPE_OBJECT},null},			//		public final static int		opc_if_acmpeq = 165;		
		{{CodeConstants.TYPE_OBJECT, CodeConstants.TYPE_OBJECT},null},			//		public final static int		opc_if_acmpne = 166;		
		{null,null},			//		public final static int		opc_goto = 167;				
		{null,{CodeConstants.TYPE_ADDRESS}},			//		public final static int		opc_jsr = 168;				
		{null,null},			//		public final static int		opc_ret = 169;				
		{{CodeConstants.TYPE_INT},null},			//		public final static int		opc_tableswitch = 170;		
		{{CodeConstants.TYPE_INT},null},			//		public final static int		opc_lookupswitch = 171;		
		{{CodeConstants.TYPE_INT},null},			//		public final static int		opc_ireturn = 172;			
		{{CodeConstants.TYPE_LONG},null},			//		public final static int		opc_lreturn = 173;			
		{{CodeConstants.TYPE_FLOAT},null},			//		public final static int		opc_freturn = 174;			
		{{CodeConstants.TYPE_DOUBLE},null},			//		public final static int		opc_dreturn = 175;			
		{{CodeConstants.TYPE_OBJECT},null},			//		public final static int		opc_areturn = 176;			
		{null,null},			//		public final static int		opc_return = 177;			
		null, 			//		public final static int		opc_getstatic = 178;		
		null, 			//		public final static int		opc_putstatic = 179;		
		null, 			//		public final static int		opc_getfield = 180;			
		null, 			//		public final static int		opc_putfield = 181;			
		null, 			//		public final static int		opc_invokevirtual = 182;	
		null, 			//		public final static int		opc_invokespecial = 183;	
		null, 			//		public final static int		opc_invokestatic = 184;		
		null, 			//		public final static int		opc_invokeinterface = 185;	
		null, 			//		public final static int		opc_xxxunusedxxx = 186;		
		null,			//		public final static int		opc_new = 187;				
		null,			//		public final static int		opc_newarray = 188;			
		null,			//		public final static int		opc_anewarray = 189;		
		{{CodeConstants.TYPE_OBJECT},{CodeConstants.TYPE_INT}},			//		public final static int		opc_arraylength = 190;		
		null,								 			//		public final static int		opc_athrow = 191;			
		null,											//		public final static int		opc_checkcast = 192;		
		null,											//		public final static int		opc_instanceof = 193;		
		{{CodeConstants.TYPE_OBJECT},null},				//		public final static int		opc_monitorenter = 194;		
		{{CodeConstants.TYPE_OBJECT},null},				//		public final static int		opc_monitorexit = 195;		
		null, 											//		public final static int		opc_wide = 196;				
		null, 											//		public final static int		opc_multianewarray = 197;	
		{{CodeConstants.TYPE_OBJECT},null},				//		public final static int		opc_ifnull = 198;			
		{{CodeConstants.TYPE_OBJECT},null},				//		public final static int		opc_ifnonnull = 199;		
		{null,null},									//		public final static int		opc_goto_w = 200;			
		{null,{CodeConstants.TYPE_ADDRESS}},			//		public final static int		opc_jsr_w = 201;			
	};

	private static final int[] arr_type = new int[] {
			CodeConstants.TYPE_BOOLEAN,
			CodeConstants.TYPE_CHAR,
			CodeConstants.TYPE_FLOAT,
			CodeConstants.TYPE_DOUBLE,
			CodeConstants.TYPE_BYTE,
			CodeConstants.TYPE_SHORT,
			CodeConstants.TYPE_INT,
			CodeConstants.TYPE_LONG
		};
	
	
	// Sonderbehandlung
//	null,			//		public final static int		opc_aconst_null = 1;
//	null, 			//		public final static int		opc_ldc = 18;		
//	null, 			//		public final static int		opc_ldc_w = 19;		
//	null, 			//		public final static int		opc_ldc2_w = 20;	
//	null,			//		public final static int		opc_aload = 25;		
//	null,			//		public final static int		opc_aaload = 50;		
//	null,			//		public final static int		opc_astore = 58;		
//	null, 			//		public final static int		opc_dup = 89;		
//	null, 			//		public final static int		opc_dup_x1 = 90;		
//	null, 			//		public final static int		opc_dup_x2 = 91;		
//	null, 			//		public final static int		opc_dup2 = 92;		
//	null, 			//		public final static int		opc_dup2_x1 = 93;		
//	null, 			//		public final static int		opc_dup2_x2 = 94;		
//	null, 			//		public final static int		opc_swap = 95;		
//	null, 			//		public final static int		opc_getstatic = 178;		
//	null, 			//		public final static int		opc_putstatic = 179;		
//	null, 			//		public final static int		opc_getfield = 180;			
//	null, 			//		public final static int		opc_putfield = 181;			
//	null, 			//		public final static int		opc_invokevirtual = 182;	
//	null, 			//		public final static int		opc_invokespecial = 183;	
//	null, 			//		public final static int		opc_invokestatic = 184;		
//	null, 			//		public final static int		opc_invokeinterface = 185;	
//	null,			//		public final static int		opc_new = 187;				
//	null,			//		public final static int		opc_newarray = 188;			
//	null,			//		public final static int		opc_anewarray = 189;		
//	null, 			//		public final static int		opc_athrow = 191;			
//	null,			//		public final static int		opc_checkcast = 192;		
//	null,			//		public final static int		opc_instanceof = 193;		
//	null, 			//		public final static int		opc_multianewarray = 197;	
	
	
	public static void stepTypes(DataPoint data, Instruction instr, ConstantPool pool) {
		
		ListStack<VarType> stack = data.getStack(); 
		int[][] arr = stack_impact[instr.opcode];
		
		if(arr != null) {
			// simple types only
			
			int[] read = arr[0];
			int[] write = arr[1];
			
			if(read!=null) {
				int depth = 0;
				for(int i=0;i<read.length;i++) {
					int type = read[i];
					depth++;
					if(type == CodeConstants.TYPE_LONG || 
							type == CodeConstants.TYPE_DOUBLE) {
						depth++;
					}
				}
				
				stack.removeMultiple(depth); 
			}
			
			if(write!=null) {
				for(int i=0;i<write.length;i++) {
					int type = write[i];
					stack.push(new VarType(type));
					if(type == CodeConstants.TYPE_LONG || 
							type == CodeConstants.TYPE_DOUBLE) {
						stack.push(new VarType(CodeConstants.TYPE_GROUP2EMPTY));
					}
				}
			}
			
		} else {
			// Sonderbehandlung
			processSpecialInstructions(data, instr, pool);
		}
		
	}
	
	private static void processSpecialInstructions(DataPoint data, Instruction instr, ConstantPool pool) {
		
		VarType var1;
		PrimitiveConstant cn;
		LinkConstant ck;
		
		ListStack<VarType> stack = data.getStack(); 
		
		switch(instr.opcode) {
			case CodeConstants.opc_aconst_null:
				stack.push(new VarType(CodeConstants.TYPE_NULL,0,null));
				break;
			case CodeConstants.opc_ldc:	
			case CodeConstants.opc_ldc_w:
			case CodeConstants.opc_ldc2_w:
				cn = pool.getPrimitiveConstant(instr.getOperand(0));
				switch(cn.type) {
				case CodeConstants.CONSTANT_Integer:
					stack.push(new VarType(CodeConstants.TYPE_INT));
					break;
				case CodeConstants.CONSTANT_Float:
					stack.push(new VarType(CodeConstants.TYPE_FLOAT));
					break;
				case CodeConstants.CONSTANT_Long:
					stack.push(new VarType(CodeConstants.TYPE_LONG));
					stack.push(new VarType(CodeConstants.TYPE_GROUP2EMPTY));
					break;
				case CodeConstants.CONSTANT_Double:
					stack.push(new VarType(CodeConstants.TYPE_DOUBLE));
					stack.push(new VarType(CodeConstants.TYPE_GROUP2EMPTY));
					break;
				case CodeConstants.CONSTANT_String:
					stack.push(new VarType(CodeConstants.TYPE_OBJECT, 0, "java/lang/String"));
					break;
				case CodeConstants.CONSTANT_Class:
					stack.push(new VarType(CodeConstants.TYPE_OBJECT, 0, "java/lang/Class"));
					break;
				}
				break;
			case CodeConstants.opc_aload:
				var1 = data.getVariable(instr.getOperand(0));
				if(var1!=null) {
					stack.push(var1);
				} else {
					stack.push(new VarType(CodeConstants.TYPE_OBJECT,0,null));
				}
				break;
			case CodeConstants.opc_aaload:		
				var1 = stack.pop(2);
				stack.push(new VarType(var1.type, var1.arraydim-1, var1.value));
				break;
			case CodeConstants.opc_astore:
				data.setVariable(instr.getOperand(0), (VarType)stack.pop());
				break;
			case CodeConstants.opc_dup:
			case CodeConstants.opc_dup_x1:	
			case CodeConstants.opc_dup_x2:		
				int depth1 = 88 - instr.opcode;
				stack.insertByOffset(depth1, stack.getByOffset(-1).copy());
				break;
			case CodeConstants.opc_dup2:
			case CodeConstants.opc_dup2_x1:	
			case CodeConstants.opc_dup2_x2:		
				int depth2 = 90 - instr.opcode;
				stack.insertByOffset(depth2, stack.getByOffset(-2).copy());
				stack.insertByOffset(depth2, stack.getByOffset(-1).copy());
				break;
			case CodeConstants.opc_swap:
				var1 = stack.pop();
				stack.insertByOffset(-1, var1);
				break;
			case CodeConstants.opc_getfield:
				stack.pop(); 
			case CodeConstants.opc_getstatic:
				ck = pool.getLinkConstant(instr.getOperand(0));
				var1 = new VarType(ck.descriptor);
				stack.push(var1);
				if(var1.stack_size==2) {
					stack.push(new VarType(CodeConstants.TYPE_GROUP2EMPTY));
				}
				break;
			case CodeConstants.opc_putfield:
				stack.pop(); 
			case CodeConstants.opc_putstatic:
				ck = pool.getLinkConstant(instr.getOperand(0));
				var1 = new VarType(ck.descriptor);
				stack.pop(var1.stack_size);
				break;
			case CodeConstants.opc_invokevirtual:	
			case CodeConstants.opc_invokespecial:	
			case CodeConstants.opc_invokeinterface:
				stack.pop();
			case CodeConstants.opc_invokestatic:
			case CodeConstants.opc_invokedynamic:
				if(instr.opcode != CodeConstants.opc_invokedynamic || instr.bytecode_version >= CodeConstants.BYTECODE_JAVA_7) {
					ck = pool.getLinkConstant(instr.getOperand(0));
					MethodDescriptor md = MethodDescriptor.parseDescriptor(ck.descriptor);
					for(int i=0;i<md.params.length;i++) {
						stack.pop(md.params[i].stack_size); 
					}
					if(md.ret.type != CodeConstants.TYPE_VOID) {
						stack.push(md.ret);
						if(md.ret.stack_size==2) {
							stack.push(new VarType(CodeConstants.TYPE_GROUP2EMPTY));
						}
					}
				}
				break;
			case CodeConstants.opc_new:
				cn = pool.getPrimitiveConstant(instr.getOperand(0));
				stack.push(new VarType(CodeConstants.TYPE_OBJECT, 0, cn.getString()));
				break;
			case CodeConstants.opc_newarray:
				stack.pop(); 
				var1 = new VarType(arr_type[instr.getOperand(0)-4]);
				var1.arraydim = 1;
				stack.push(var1);
				break;
			case CodeConstants.opc_athrow:	
				var1 = stack.pop(); 
				stack.clear(); 
				stack.push(var1);
				break;
			case CodeConstants.opc_checkcast:
			case CodeConstants.opc_instanceof:
				stack.pop();
				cn = pool.getPrimitiveConstant(instr.getOperand(0));
				stack.push(new VarType(CodeConstants.TYPE_OBJECT, 0, cn.getString()));
				break;
			case CodeConstants.opc_anewarray:	
			case CodeConstants.opc_multianewarray:	
				int dimensions = (instr.opcode==CodeConstants.opc_anewarray)?1:instr.getOperand(1);
				stack.pop(dimensions); 
				cn = pool.getPrimitiveConstant(instr.getOperand(0));
				if(cn.isArray) {
					var1 = new VarType(CodeConstants.TYPE_OBJECT, 0, cn.getString());
					var1.arraydim+=dimensions; 
					stack.push(var1);
				} else {
					stack.push(new VarType(CodeConstants.TYPE_OBJECT, dimensions, cn.getString()));
				}
		}
		
	}
	
}