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fernflower/src/org/jetbrains/java/decompiler/modules/decompiler/exps/FunctionExprent.java

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/*
* Copyright 2000-2014 JetBrains s.r.o.
*
* 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 org.jetbrains.java.decompiler.modules.decompiler.exps;
import org.jetbrains.java.decompiler.code.CodeConstants;
import org.jetbrains.java.decompiler.main.TextBuffer;
import org.jetbrains.java.decompiler.main.collectors.BytecodeMappingTracer;
import org.jetbrains.java.decompiler.modules.decompiler.ExprProcessor;
import org.jetbrains.java.decompiler.modules.decompiler.vars.CheckTypesResult;
import org.jetbrains.java.decompiler.struct.gen.VarType;
import org.jetbrains.java.decompiler.util.InterpreterUtil;
import org.jetbrains.java.decompiler.util.ListStack;
import java.util.*;
public class FunctionExprent extends Exprent {
public static final int FUNCTION_ADD = 0;
public static final int FUNCTION_SUB = 1;
public static final int FUNCTION_MUL = 2;
public static final int FUNCTION_DIV = 3;
public static final int FUNCTION_AND = 4;
public static final int FUNCTION_OR = 5;
public static final int FUNCTION_XOR = 6;
public static final int FUNCTION_REM = 7;
public static final int FUNCTION_SHL = 8;
public static final int FUNCTION_SHR = 9;
public static final int FUNCTION_USHR = 10;
public static final int FUNCTION_BIT_NOT = 11;
public static final int FUNCTION_BOOL_NOT = 12;
public static final int FUNCTION_NEG = 13;
public final static int FUNCTION_I2L = 14;
public final static int FUNCTION_I2F = 15;
public final static int FUNCTION_I2D = 16;
public final static int FUNCTION_L2I = 17;
public final static int FUNCTION_L2F = 18;
public final static int FUNCTION_L2D = 19;
public final static int FUNCTION_F2I = 20;
public final static int FUNCTION_F2L = 21;
public final static int FUNCTION_F2D = 22;
public final static int FUNCTION_D2I = 23;
public final static int FUNCTION_D2L = 24;
public final static int FUNCTION_D2F = 25;
public final static int FUNCTION_I2B = 26;
public final static int FUNCTION_I2C = 27;
public final static int FUNCTION_I2S = 28;
public final static int FUNCTION_CAST = 29;
public final static int FUNCTION_INSTANCEOF = 30;
public final static int FUNCTION_ARRAY_LENGTH = 31;
public final static int FUNCTION_IMM = 32;
public final static int FUNCTION_MMI = 33;
public final static int FUNCTION_IPP = 34;
public final static int FUNCTION_PPI = 35;
public final static int FUNCTION_IIF = 36;
public final static int FUNCTION_LCMP = 37;
public final static int FUNCTION_FCMPL = 38;
public final static int FUNCTION_FCMPG = 39;
public final static int FUNCTION_DCMPL = 40;
public final static int FUNCTION_DCMPG = 41;
public static final int FUNCTION_EQ = 42;
public static final int FUNCTION_NE = 43;
public static final int FUNCTION_LT = 44;
public static final int FUNCTION_GE = 45;
public static final int FUNCTION_GT = 46;
public static final int FUNCTION_LE = 47;
public static final int FUNCTION_CADD = 48;
public static final int FUNCTION_COR = 49;
public static final int FUNCTION_STR_CONCAT = 50;
private static final VarType[] TYPES = {
VarType.VARTYPE_LONG,
VarType.VARTYPE_FLOAT,
VarType.VARTYPE_DOUBLE,
VarType.VARTYPE_INT,
VarType.VARTYPE_FLOAT,
VarType.VARTYPE_DOUBLE,
VarType.VARTYPE_INT,
VarType.VARTYPE_LONG,
VarType.VARTYPE_DOUBLE,
VarType.VARTYPE_INT,
VarType.VARTYPE_LONG,
VarType.VARTYPE_FLOAT,
VarType.VARTYPE_BYTE,
VarType.VARTYPE_CHAR,
VarType.VARTYPE_SHORT
};
private static final String[] OPERATORS = {
" + ",
" - ",
" * ",
" / ",
" & ",
" | ",
" ^ ",
" % ",
" << ",
" >> ",
" >>> ",
" == ",
" != ",
" < ",
" >= ",
" > ",
" <= ",
" && ",
" || ",
" + "
};
private static final int[] PRECEDENCE = {
3, // FUNCTION_ADD
3, // FUNCTION_SUB
2, // FUNCTION_MUL
2, // FUNCTION_DIV
7, // FUNCTION_AND
9, // FUNCTION_OR
8, // FUNCTION_XOR
2, // FUNCTION_REM
4, // FUNCTION_SHL
4, // FUNCTION_SHR
4, // FUNCTION_USHR
1, // FUNCTION_BIT_NOT
1, // FUNCTION_BOOL_NOT
1, // FUNCTION_NEG
1, // FUNCTION_I2L
1, // FUNCTION_I2F
1, // FUNCTION_I2D
1, // FUNCTION_L2I
1, // FUNCTION_L2F
1, // FUNCTION_L2D
1, // FUNCTION_F2I
1, // FUNCTION_F2L
1, // FUNCTION_F2D
1, // FUNCTION_D2I
1, // FUNCTION_D2L
1, // FUNCTION_D2F
1, // FUNCTION_I2B
1, // FUNCTION_I2C
1, // FUNCTION_I2S
1, // FUNCTION_CAST
6, // FUNCTION_INSTANCEOF
0, // FUNCTION_ARRAY_LENGTH
1, // FUNCTION_IMM
1, // FUNCTION_MMI
1, // FUNCTION_IPP
1, // FUNCTION_PPI
12, // FUNCTION_IFF
-1, // FUNCTION_LCMP
-1, // FUNCTION_FCMPL
-1, // FUNCTION_FCMPG
-1, // FUNCTION_DCMPL
-1, // FUNCTION_DCMPG
6, // FUNCTION_EQ = 41;
6, // FUNCTION_NE = 42;
5, // FUNCTION_LT = 43;
5, // FUNCTION_GE = 44;
5, // FUNCTION_GT = 45;
5, // FUNCTION_LE = 46;
10, // FUNCTION_CADD = 47;
11, // FUNCTION_COR = 48;
3 // FUNCTION_STR_CONCAT = 49;
};
private static final Set<Integer> ASSOCIATIVITY = new HashSet<Integer>(Arrays.asList(
FUNCTION_ADD, FUNCTION_MUL, FUNCTION_AND, FUNCTION_OR, FUNCTION_XOR, FUNCTION_CADD, FUNCTION_COR, FUNCTION_STR_CONCAT));
private int funcType;
private VarType implicitType;
private final List<Exprent> lstOperands;
public FunctionExprent(int funcType, ListStack<Exprent> stack, Set<Integer> bytecodeOffsets) {
this(funcType, new ArrayList<Exprent>(), bytecodeOffsets);
if (funcType >= FUNCTION_BIT_NOT && funcType <= FUNCTION_PPI && funcType != FUNCTION_CAST && funcType != FUNCTION_INSTANCEOF) {
lstOperands.add(stack.pop());
}
else if (funcType == FUNCTION_IIF) {
throw new RuntimeException("no direct instantiation possible");
}
else {
Exprent expr = stack.pop();
lstOperands.add(stack.pop());
lstOperands.add(expr);
}
}
public FunctionExprent(int funcType, List<Exprent> operands, Set<Integer> bytecodeOffsets) {
super(EXPRENT_FUNCTION);
this.funcType = funcType;
this.lstOperands = operands;
addBytecodeOffsets(bytecodeOffsets);
}
@Override
public VarType getExprType() {
VarType exprType = null;
if (funcType <= FUNCTION_NEG || funcType == FUNCTION_IPP || funcType == FUNCTION_PPI
|| funcType == FUNCTION_IMM || funcType == FUNCTION_MMI) {
VarType type1 = lstOperands.get(0).getExprType();
VarType type2 = null;
if (lstOperands.size() > 1) {
type2 = lstOperands.get(1).getExprType();
}
switch (funcType) {
case FUNCTION_IMM:
case FUNCTION_MMI:
case FUNCTION_IPP:
case FUNCTION_PPI:
exprType = implicitType;
break;
case FUNCTION_BOOL_NOT:
exprType = VarType.VARTYPE_BOOLEAN;
break;
case FUNCTION_SHL:
case FUNCTION_SHR:
case FUNCTION_USHR:
case FUNCTION_BIT_NOT:
case FUNCTION_NEG:
exprType = getMaxVarType(new VarType[]{type1});
break;
case FUNCTION_ADD:
case FUNCTION_SUB:
case FUNCTION_MUL:
case FUNCTION_DIV:
case FUNCTION_REM:
exprType = getMaxVarType(new VarType[]{type1, type2});
break;
case FUNCTION_AND:
case FUNCTION_OR:
case FUNCTION_XOR:
if (type1.type == CodeConstants.TYPE_BOOLEAN & type2.type == CodeConstants.TYPE_BOOLEAN) {
exprType = VarType.VARTYPE_BOOLEAN;
}
else {
exprType = getMaxVarType(new VarType[]{type1, type2});
}
}
}
else if (funcType == FUNCTION_CAST) {
exprType = lstOperands.get(1).getExprType();
}
else if (funcType == FUNCTION_IIF) {
Exprent param1 = lstOperands.get(1);
Exprent param2 = lstOperands.get(2);
VarType supertype = VarType.getCommonSupertype(param1.getExprType(), param2.getExprType());
if (param1.type == Exprent.EXPRENT_CONST && param2.type == Exprent.EXPRENT_CONST &&
supertype.type != CodeConstants.TYPE_BOOLEAN && VarType.VARTYPE_INT.isSuperset(supertype)) {
exprType = VarType.VARTYPE_INT;
}
else {
exprType = supertype;
}
}
else if (funcType == FUNCTION_STR_CONCAT) {
exprType = VarType.VARTYPE_STRING;
}
else if (funcType >= FUNCTION_EQ || funcType == FUNCTION_INSTANCEOF) {
exprType = VarType.VARTYPE_BOOLEAN;
}
else if (funcType >= FUNCTION_ARRAY_LENGTH) {
exprType = VarType.VARTYPE_INT;
}
else {
exprType = TYPES[funcType - FUNCTION_I2L];
}
return exprType;
}
@Override
public int getExprentUse() {
if (funcType >= FUNCTION_IMM && funcType <= FUNCTION_PPI) {
return 0;
}
else {
int ret = Exprent.MULTIPLE_USES | Exprent.SIDE_EFFECTS_FREE;
for (Exprent expr : lstOperands) {
ret &= expr.getExprentUse();
}
return ret;
}
}
@Override
public CheckTypesResult checkExprTypeBounds() {
CheckTypesResult result = new CheckTypesResult();
Exprent param1 = lstOperands.get(0);
VarType type1 = param1.getExprType();
Exprent param2 = null;
VarType type2 = null;
if (lstOperands.size() > 1) {
param2 = lstOperands.get(1);
type2 = param2.getExprType();
}
switch (funcType) {
case FUNCTION_IIF:
VarType supertype = getExprType();
if (supertype == null) {
supertype = getExprType();
}
result.addMinTypeExprent(param1, VarType.VARTYPE_BOOLEAN);
result.addMinTypeExprent(param2, VarType.getMinTypeInFamily(supertype.typeFamily));
result.addMinTypeExprent(lstOperands.get(2), VarType.getMinTypeInFamily(supertype.typeFamily));
break;
case FUNCTION_I2L:
case FUNCTION_I2F:
case FUNCTION_I2D:
case FUNCTION_I2B:
case FUNCTION_I2C:
case FUNCTION_I2S:
result.addMinTypeExprent(param1, VarType.VARTYPE_BYTECHAR);
result.addMaxTypeExprent(param1, VarType.VARTYPE_INT);
break;
case FUNCTION_IMM:
case FUNCTION_IPP:
case FUNCTION_MMI:
case FUNCTION_PPI:
result.addMinTypeExprent(param1, implicitType);
result.addMaxTypeExprent(param1, implicitType);
break;
case FUNCTION_ADD:
case FUNCTION_SUB:
case FUNCTION_MUL:
case FUNCTION_DIV:
case FUNCTION_REM:
case FUNCTION_SHL:
case FUNCTION_SHR:
case FUNCTION_USHR:
case FUNCTION_LT:
case FUNCTION_GE:
case FUNCTION_GT:
case FUNCTION_LE:
result.addMinTypeExprent(param2, VarType.VARTYPE_BYTECHAR);
case FUNCTION_BIT_NOT:
// case FUNCTION_BOOL_NOT:
case FUNCTION_NEG:
result.addMinTypeExprent(param1, VarType.VARTYPE_BYTECHAR);
break;
case FUNCTION_AND:
case FUNCTION_OR:
case FUNCTION_XOR:
case FUNCTION_EQ:
case FUNCTION_NE: {
if (type1.type == CodeConstants.TYPE_BOOLEAN) {
if (type2.isStrictSuperset(type1)) {
result.addMinTypeExprent(param1, VarType.VARTYPE_BYTECHAR);
}
else { // both are booleans
boolean param1_false_boolean =
type1.isFalseBoolean() || (param1.type == Exprent.EXPRENT_CONST && !((ConstExprent)param1).hasBooleanValue());
boolean param2_false_boolean =
type1.isFalseBoolean() || (param2.type == Exprent.EXPRENT_CONST && !((ConstExprent)param2).hasBooleanValue());
if (param1_false_boolean || param2_false_boolean) {
result.addMinTypeExprent(param1, VarType.VARTYPE_BYTECHAR);
result.addMinTypeExprent(param2, VarType.VARTYPE_BYTECHAR);
}
}
}
else if (type2.type == CodeConstants.TYPE_BOOLEAN) {
if (type1.isStrictSuperset(type2)) {
result.addMinTypeExprent(param2, VarType.VARTYPE_BYTECHAR);
}
}
}
}
return result;
}
@Override
public List<Exprent> getAllExprents() {
List<Exprent> lst = new ArrayList<Exprent>();
lst.addAll(lstOperands);
return lst;
}
@Override
public Exprent copy() {
List<Exprent> lst = new ArrayList<Exprent>();
for (Exprent expr : lstOperands) {
lst.add(expr.copy());
}
FunctionExprent func = new FunctionExprent(funcType, lst, bytecode);
func.setImplicitType(implicitType);
return func;
}
@Override
public boolean equals(Object o) {
if (o == this) return true;
if (o == null || !(o instanceof FunctionExprent)) return false;
FunctionExprent fe = (FunctionExprent)o;
return funcType == fe.getFuncType() &&
InterpreterUtil.equalLists(lstOperands, fe.getLstOperands()); // TODO: order of operands insignificant
}
@Override
public void replaceExprent(Exprent oldExpr, Exprent newExpr) {
for (int i = 0; i < lstOperands.size(); i++) {
if (oldExpr == lstOperands.get(i)) {
lstOperands.set(i, newExpr);
}
}
}
@Override
public TextBuffer toJava(int indent, BytecodeMappingTracer tracer) {
tracer.addMapping(bytecode);
if (funcType <= FUNCTION_USHR) {
return wrapOperandString(lstOperands.get(0), false, indent, tracer)
.append(OPERATORS[funcType])
.append(wrapOperandString(lstOperands.get(1), true, indent, tracer));
}
if (funcType >= FUNCTION_EQ) {
return wrapOperandString(lstOperands.get(0), false, indent, tracer)
.append(OPERATORS[funcType - FUNCTION_EQ + 11])
.append(wrapOperandString(lstOperands.get(1), true, indent, tracer));
}
switch (funcType) {
case FUNCTION_BIT_NOT:
return wrapOperandString(lstOperands.get(0), true, indent, tracer).prepend("~");
case FUNCTION_BOOL_NOT:
return wrapOperandString(lstOperands.get(0), true, indent, tracer).prepend("!");
case FUNCTION_NEG:
return wrapOperandString(lstOperands.get(0), true, indent, tracer).prepend("-");
case FUNCTION_CAST:
return lstOperands.get(1).toJava(indent, tracer).enclose("(", ")").append(wrapOperandString(lstOperands.get(0), true, indent, tracer));
case FUNCTION_ARRAY_LENGTH:
Exprent arr = lstOperands.get(0);
TextBuffer res = wrapOperandString(arr, false, indent, tracer);
if (arr.getExprType().arrayDim == 0) {
VarType objArr = VarType.VARTYPE_OBJECT.resizeArrayDim(1); // type family does not change
res.enclose("((" + ExprProcessor.getCastTypeName(objArr) + ")", ")");
}
return res.append(".length");
case FUNCTION_IIF:
return wrapOperandString(lstOperands.get(0), true, indent, tracer)
.append("?")
.append(wrapOperandString(lstOperands.get(1), true, indent, tracer))
.append(":")
.append(wrapOperandString(lstOperands.get(2), true, indent, tracer));
case FUNCTION_IPP:
return wrapOperandString(lstOperands.get(0), true, indent, tracer).append("++");
case FUNCTION_PPI:
return wrapOperandString(lstOperands.get(0), true, indent, tracer).prepend("++");
case FUNCTION_IMM:
return wrapOperandString(lstOperands.get(0), true, indent, tracer).append("--");
case FUNCTION_MMI:
return wrapOperandString(lstOperands.get(0), true, indent, tracer).prepend("--");
case FUNCTION_INSTANCEOF:
return wrapOperandString(lstOperands.get(0), true, indent, tracer).append(" instanceof ").append(wrapOperandString(lstOperands.get(1), true, indent, tracer));
case FUNCTION_LCMP: // shouldn't appear in the final code
return wrapOperandString(lstOperands.get(0), true, indent, tracer).prepend("__lcmp__(")
.append(",")
.append(wrapOperandString(lstOperands.get(1), true, indent, tracer))
.append(")");
case FUNCTION_FCMPL: // shouldn't appear in the final code
return wrapOperandString(lstOperands.get(0), true, indent, tracer).prepend("__fcmpl__(")
.append(",")
.append(wrapOperandString(lstOperands.get(1), true, indent, tracer))
.append(")");
case FUNCTION_FCMPG: // shouldn't appear in the final code
return wrapOperandString(lstOperands.get(0), true, indent, tracer).prepend("__fcmpg__(")
.append(",")
.append(wrapOperandString(lstOperands.get(1), true, indent, tracer))
.append(")");
case FUNCTION_DCMPL: // shouldn't appear in the final code
return wrapOperandString(lstOperands.get(0), true, indent, tracer).prepend("__dcmpl__(")
.append(",")
.append(wrapOperandString(lstOperands.get(1), true, indent, tracer))
.append(")");
case FUNCTION_DCMPG: // shouldn't appear in the final code
return wrapOperandString(lstOperands.get(0), true, indent, tracer).prepend("__dcmpg__(")
.append(",")
.append(wrapOperandString(lstOperands.get(1), true, indent, tracer))
.append(")");
}
if (funcType <= FUNCTION_I2S) {
return wrapOperandString(lstOperands.get(0), true, indent, tracer).prepend("(" + ExprProcessor.getTypeName(
TYPES[funcType - FUNCTION_I2L]) + ")");
}
// return "<unknown function>";
throw new RuntimeException("invalid function");
}
@Override
public int getPrecedence() {
return getPrecedence(funcType);
}
public static int getPrecedence(int func) {
return PRECEDENCE[func];
}
public VarType getSimpleCastType() {
return TYPES[funcType - FUNCTION_I2L];
}
private TextBuffer wrapOperandString(Exprent expr, boolean eq, int indent, BytecodeMappingTracer tracer) {
int myprec = getPrecedence();
int exprprec = expr.getPrecedence();
boolean parentheses = exprprec > myprec;
if (!parentheses && eq) {
parentheses = (exprprec == myprec);
if (parentheses) {
if (expr.type == Exprent.EXPRENT_FUNCTION &&
((FunctionExprent)expr).getFuncType() == funcType) {
parentheses = !ASSOCIATIVITY.contains(funcType);
}
}
}
TextBuffer res = expr.toJava(indent, tracer);
if (parentheses) {
res.enclose("(", ")");
}
return res;
}
private static VarType getMaxVarType(VarType[] arr) {
int[] types = new int[]{CodeConstants.TYPE_DOUBLE, CodeConstants.TYPE_FLOAT, CodeConstants.TYPE_LONG};
VarType[] vartypes = new VarType[]{VarType.VARTYPE_DOUBLE, VarType.VARTYPE_FLOAT, VarType.VARTYPE_LONG};
for (int i = 0; i < types.length; i++) {
for (int j = 0; j < arr.length; j++) {
if (arr[j].type == types[i]) {
return vartypes[i];
}
}
}
return VarType.VARTYPE_INT;
}
// *****************************************************************************
// getter and setter methods
// *****************************************************************************
public int getFuncType() {
return funcType;
}
public void setFuncType(int funcType) {
this.funcType = funcType;
}
public List<Exprent> getLstOperands() {
return lstOperands;
}
public void setImplicitType(VarType implicitType) {
this.implicitType = implicitType;
}
}
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