423 lines
12 KiB
Java
423 lines
12 KiB
Java
/*
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* Copyright 2000-2014 JetBrains s.r.o.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.jetbrains.java.decompiler.struct.gen;
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import org.jetbrains.java.decompiler.code.CodeConstants;
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import org.jetbrains.java.decompiler.util.InterpreterUtil;
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public class VarType { // TODO: optimize switch
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public static final int FALSEBOOLEAN = 1;
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public static final VarType VARTYPE_UNKNOWN = new VarType(CodeConstants.TYPE_UNKNOWN);
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public static final VarType VARTYPE_INT = new VarType(CodeConstants.TYPE_INT);
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public static final VarType VARTYPE_FLOAT = new VarType(CodeConstants.TYPE_FLOAT);
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public static final VarType VARTYPE_LONG = new VarType(CodeConstants.TYPE_LONG);
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public static final VarType VARTYPE_DOUBLE = new VarType(CodeConstants.TYPE_DOUBLE);
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public static final VarType VARTYPE_BYTE = new VarType(CodeConstants.TYPE_BYTE);
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public static final VarType VARTYPE_CHAR = new VarType(CodeConstants.TYPE_CHAR);
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public static final VarType VARTYPE_SHORT = new VarType(CodeConstants.TYPE_SHORT);
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public static final VarType VARTYPE_BOOLEAN = new VarType(CodeConstants.TYPE_BOOLEAN);
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public static final VarType VARTYPE_BYTECHAR = new VarType(CodeConstants.TYPE_BYTECHAR);
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public static final VarType VARTYPE_SHORTCHAR = new VarType(CodeConstants.TYPE_SHORTCHAR);
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public static final VarType VARTYPE_NULL = new VarType(CodeConstants.TYPE_NULL, 0, null);
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public static final VarType VARTYPE_GROUP2EMPTY = new VarType(CodeConstants.TYPE_GROUP2EMPTY);
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public static final VarType VARTYPE_STRING = new VarType(CodeConstants.TYPE_OBJECT, 0, "java/lang/String");
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public static final VarType VARTYPE_CLASS = new VarType(CodeConstants.TYPE_OBJECT, 0, "java/lang/Class");
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public static final VarType VARTYPE_OBJECT = new VarType(CodeConstants.TYPE_OBJECT, 0, "java/lang/Object");
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public static final VarType VARTYPE_VOID = new VarType(CodeConstants.TYPE_VOID);
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public int type;
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public int type_family;
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public int arraydim;
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public String value;
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public int stack_size;
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public int convinfo;
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public VarType(int type) {
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this.type = type;
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this.arraydim = 0;
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value = getChar(type);
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setStackSize(type);
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setFamily();
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}
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public VarType(int type, int arraydim) {
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this(type);
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this.arraydim = arraydim;
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setFamily();
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}
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public VarType(int type, int arraydim, String value) {
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this(type);
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this.arraydim = arraydim;
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this.value = value;
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setFamily();
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}
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public VarType(String strtype) {
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this(strtype, false);
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}
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public VarType(String strtype, boolean cltype) {
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parseTypeString(strtype, cltype);
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setStackSize(type);
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setFamily();
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}
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public void decArrayDim() {
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if (arraydim > 0) {
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arraydim--;
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setFamily();
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}
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else {
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// throw new RuntimeException("array dimension equals 0!"); FIXME: investigate this case
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}
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}
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public String toString() {
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String res = "";
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for (int i = 0; i < arraydim; i++) {
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res += "[";
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}
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if (type == CodeConstants.TYPE_OBJECT) {
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res += "L" + value + ";";
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}
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else {
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res += value;
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}
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return res;
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}
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public VarType copy() {
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VarType v = new VarType(type, arraydim, value);
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v.convinfo = convinfo;
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return v;
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}
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public boolean isFalseBoolean() {
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return (convinfo & FALSEBOOLEAN) != 0;
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}
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public boolean isSuperset(VarType val) {
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return this.equals(val) || this.isStrictSuperset(val);
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}
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public boolean isStrictSuperset(VarType val) {
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int valtype = val.type;
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if (valtype == CodeConstants.TYPE_UNKNOWN && type != CodeConstants.TYPE_UNKNOWN) {
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return true;
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}
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if (val.arraydim > 0) {
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return this.equals(VARTYPE_OBJECT);
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}
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else if (arraydim > 0) {
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return (valtype == CodeConstants.TYPE_NULL);
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}
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boolean res = false;
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switch (type) {
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case CodeConstants.TYPE_INT:
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res |= (valtype == CodeConstants.TYPE_SHORT ||
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valtype == CodeConstants.TYPE_CHAR);
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case CodeConstants.TYPE_SHORT:
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res |= (valtype == CodeConstants.TYPE_BYTE);
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case CodeConstants.TYPE_CHAR:
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res |= (valtype == CodeConstants.TYPE_SHORTCHAR);
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case CodeConstants.TYPE_BYTE:
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case CodeConstants.TYPE_SHORTCHAR:
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res |= (valtype == CodeConstants.TYPE_BYTECHAR);
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case CodeConstants.TYPE_BYTECHAR:
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res |= (valtype == CodeConstants.TYPE_BOOLEAN);
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break;
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case CodeConstants.TYPE_OBJECT:
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if (valtype == CodeConstants.TYPE_NULL) {
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return true;
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}
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else if (this.equals(VARTYPE_OBJECT)) {
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return valtype == CodeConstants.TYPE_OBJECT &&
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!val.equals(VARTYPE_OBJECT);
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}
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}
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return res;
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}
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// type1 and type2 must not be null
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public static VarType getCommonMinType(VarType type1, VarType type2) {
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if (type1.type == CodeConstants.TYPE_BOOLEAN && type2.type == CodeConstants.TYPE_BOOLEAN) { // special case booleans
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return type1.isFalseBoolean() ? type2 : type1;
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}
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if (type1.isSuperset(type2)) {
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return type2;
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}
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else if (type2.isSuperset(type1)) {
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return type1;
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}
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else if (type1.type_family == type2.type_family) {
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switch (type1.type_family) {
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case CodeConstants.TYPE_FAMILY_INTEGER:
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if ((type1.type == CodeConstants.TYPE_CHAR && type2.type == CodeConstants.TYPE_SHORT)
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|| (type1.type == CodeConstants.TYPE_SHORT && type2.type == CodeConstants.TYPE_CHAR)) {
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return VARTYPE_SHORTCHAR;
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}
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else {
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return VARTYPE_BYTECHAR;
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}
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case CodeConstants.TYPE_FAMILY_OBJECT:
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return VARTYPE_NULL;
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}
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}
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return null;
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}
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// type1 and type2 must not be null
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public static VarType getCommonSupertype(VarType type1, VarType type2) {
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if (type1.type == CodeConstants.TYPE_BOOLEAN && type2.type == CodeConstants.TYPE_BOOLEAN) { // special case booleans
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return type1.isFalseBoolean() ? type1 : type2;
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}
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if (type1.isSuperset(type2)) {
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return type1;
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}
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else if (type2.isSuperset(type1)) {
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return type2;
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}
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else if (type1.type_family == type2.type_family) {
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switch (type1.type_family) {
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case CodeConstants.TYPE_FAMILY_INTEGER:
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if ((type1.type == CodeConstants.TYPE_SHORTCHAR && type2.type == CodeConstants.TYPE_BYTE)
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|| (type1.type == CodeConstants.TYPE_BYTE && type2.type == CodeConstants.TYPE_SHORTCHAR)) {
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return VARTYPE_SHORT;
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}
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else {
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return VARTYPE_INT;
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}
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case CodeConstants.TYPE_FAMILY_OBJECT:
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return VARTYPE_OBJECT;
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}
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}
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return null;
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}
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public static VarType getMinTypeInFamily(int family) {
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switch (family) {
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case CodeConstants.TYPE_FAMILY_BOOLEAN:
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return VARTYPE_BOOLEAN;
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case CodeConstants.TYPE_FAMILY_INTEGER:
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return VARTYPE_BYTECHAR;
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case CodeConstants.TYPE_FAMILY_OBJECT:
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return VARTYPE_NULL;
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case CodeConstants.TYPE_FAMILY_FLOAT:
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return VARTYPE_FLOAT;
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case CodeConstants.TYPE_FAMILY_LONG:
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return VARTYPE_LONG;
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case CodeConstants.TYPE_FAMILY_DOUBLE:
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return VARTYPE_DOUBLE;
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case CodeConstants.TYPE_FAMILY_UNKNOWN:
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return VARTYPE_UNKNOWN;
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default:
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throw new RuntimeException("invalid type family!");
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}
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}
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public boolean equals(Object o) {
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if (o == this) {
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return true;
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}
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if (o == null || !(o instanceof VarType)) {
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return false;
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}
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VarType vt = (VarType)o;
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return type == vt.type && arraydim == vt.arraydim && InterpreterUtil.equalObjects(value, vt.value);
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}
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private void parseTypeString(String strtype, boolean cltype) {
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for (int i = 0; i < strtype.length(); i++) {
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switch (strtype.charAt(i)) {
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case '[':
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arraydim++;
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break;
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case 'L':
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if (strtype.charAt(strtype.length() - 1) == ';') {
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type = CodeConstants.TYPE_OBJECT;
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value = strtype.substring(i + 1, strtype.length() - 1);
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return;
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}
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default:
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value = strtype.substring(i, strtype.length());
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if ((cltype && i == 0) || value.length() > 1) {
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type = CodeConstants.TYPE_OBJECT;
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}
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else {
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type = getType(value.charAt(0));
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}
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return;
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}
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}
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}
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private void setStackSize(int type) {
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if (arraydim > 0) {
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stack_size = 1;
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}
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else {
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stack_size = (type == CodeConstants.TYPE_DOUBLE ||
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type == CodeConstants.TYPE_LONG) ? 2 :
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((type == CodeConstants.TYPE_VOID ||
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type == CodeConstants.TYPE_GROUP2EMPTY) ? 0 : 1);
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}
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}
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private static int getType(char c) {
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switch (c) {
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case 'B':
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return CodeConstants.TYPE_BYTE;
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case 'C':
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return CodeConstants.TYPE_CHAR;
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case 'D':
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return CodeConstants.TYPE_DOUBLE;
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case 'F':
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return CodeConstants.TYPE_FLOAT;
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case 'I':
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return CodeConstants.TYPE_INT;
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case 'J':
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return CodeConstants.TYPE_LONG;
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case 'S':
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return CodeConstants.TYPE_SHORT;
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case 'Z':
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return CodeConstants.TYPE_BOOLEAN;
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case 'V':
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return CodeConstants.TYPE_VOID;
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case 'G':
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return CodeConstants.TYPE_GROUP2EMPTY;
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case 'N':
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return CodeConstants.TYPE_NOTINITIALIZED;
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case 'A':
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return CodeConstants.TYPE_ADDRESS;
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case 'X':
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return CodeConstants.TYPE_BYTECHAR;
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case 'Y':
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return CodeConstants.TYPE_SHORTCHAR;
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case 'U':
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return CodeConstants.TYPE_UNKNOWN;
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default:
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throw new RuntimeException("Invalid type");
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}
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}
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private static String getChar(int type) {
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switch (type) {
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case CodeConstants.TYPE_BYTE:
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return "B";
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case CodeConstants.TYPE_CHAR:
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return "C";
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case CodeConstants.TYPE_DOUBLE:
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return "D";
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case CodeConstants.TYPE_FLOAT:
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return "F";
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case CodeConstants.TYPE_INT:
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return "I";
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case CodeConstants.TYPE_LONG:
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return "J";
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case CodeConstants.TYPE_SHORT:
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return "S";
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case CodeConstants.TYPE_BOOLEAN:
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return "Z";
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case CodeConstants.TYPE_VOID:
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return "V";
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case CodeConstants.TYPE_GROUP2EMPTY:
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return "G";
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case CodeConstants.TYPE_NOTINITIALIZED:
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return "N";
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case CodeConstants.TYPE_ADDRESS:
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return "A";
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case CodeConstants.TYPE_BYTECHAR:
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return "X";
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case CodeConstants.TYPE_SHORTCHAR:
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return "Y";
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case CodeConstants.TYPE_UNKNOWN:
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return "U";
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case CodeConstants.TYPE_NULL:
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case CodeConstants.TYPE_OBJECT:
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return null;
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default:
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throw new RuntimeException("Invalid type");
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}
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}
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public void setFamily() {
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if (arraydim > 0) {
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this.type_family = CodeConstants.TYPE_FAMILY_OBJECT;
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return;
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}
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switch (type) {
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case CodeConstants.TYPE_BYTE:
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case CodeConstants.TYPE_BYTECHAR:
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case CodeConstants.TYPE_SHORTCHAR:
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case CodeConstants.TYPE_CHAR:
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case CodeConstants.TYPE_SHORT:
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case CodeConstants.TYPE_INT:
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this.type_family = CodeConstants.TYPE_FAMILY_INTEGER;
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break;
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case CodeConstants.TYPE_DOUBLE:
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this.type_family = CodeConstants.TYPE_FAMILY_DOUBLE;
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break;
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case CodeConstants.TYPE_FLOAT:
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this.type_family = CodeConstants.TYPE_FAMILY_FLOAT;
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break;
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case CodeConstants.TYPE_LONG:
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this.type_family = CodeConstants.TYPE_FAMILY_LONG;
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break;
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case CodeConstants.TYPE_BOOLEAN:
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this.type_family = CodeConstants.TYPE_FAMILY_BOOLEAN;
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break;
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case CodeConstants.TYPE_NULL:
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case CodeConstants.TYPE_OBJECT:
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this.type_family = CodeConstants.TYPE_FAMILY_OBJECT;
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break;
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default:
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this.type_family = CodeConstants.TYPE_FAMILY_UNKNOWN;
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}
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}
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}
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