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Dragome SDK module: bytecode to javascript compiler
/*
* Copyright (C) 2008 The Android Open Source Project
*
* 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 com.android.dx.dex.code;
import com.android.dx.rop.cst.CstType;
import com.android.dx.util.FixedSizeList;
import com.android.dx.util.Hex;
/**
* Ordered list of (exception type, handler address) entries.
*/
public final class CatchHandlerList extends FixedSizeList
implements Comparable {
/** {@code non-null;} empty instance */
public static final CatchHandlerList EMPTY = new CatchHandlerList(0);
/**
* Constructs an instance. All indices initially contain {@code null}.
*
* @param size {@code >= 0;} the size of the list
*/
public CatchHandlerList(int size) {
super(size);
}
/**
* Gets the element at the given index. It is an error to call
* this with the index for an element which was never set; if you
* do that, this will throw {@code NullPointerException}.
*
* @param n {@code >= 0, < size();} which index
* @return {@code non-null;} element at that index
*/
public Entry get(int n) {
return (Entry) get0(n);
}
/** {@inheritDoc} */
public String toHuman() {
return toHuman("", "");
}
/**
* Get the human form of this instance, prefixed on each line
* with the string.
*
* @param prefix {@code non-null;} the prefix for every line
* @param header {@code non-null;} the header for the first line (after the
* first prefix)
* @return {@code non-null;} the human form
*/
public String toHuman(String prefix, String header) {
StringBuilder sb = new StringBuilder(100);
int size = size();
sb.append(prefix);
sb.append(header);
sb.append("catch ");
for (int i = 0; i < size; i++) {
Entry entry = get(i);
if (i != 0) {
sb.append(",\n");
sb.append(prefix);
sb.append(" ");
}
if ((i == (size - 1)) && catchesAll()) {
sb.append("");
} else {
sb.append(entry.getExceptionType().toHuman());
}
sb.append(" -> ");
sb.append(Hex.u2or4(entry.getHandler()));
}
return sb.toString();
}
/**
* Returns whether or not this instance ends with a "catch-all"
* handler.
*
* @return {@code true} if this instance ends with a "catch-all"
* handler or {@code false} if not
*/
public boolean catchesAll() {
int size = size();
if (size == 0) {
return false;
}
Entry last = get(size - 1);
return last.getExceptionType().equals(CstType.OBJECT);
}
/**
* Sets the entry at the given index.
*
* @param n {@code >= 0, < size();} which index
* @param exceptionType {@code non-null;} type of exception handled
* @param handler {@code >= 0;} exception handler address
*/
public void set(int n, CstType exceptionType, int handler) {
set0(n, new Entry(exceptionType, handler));
}
/**
* Sets the entry at the given index.
*
* @param n {@code >= 0, < size();} which index
* @param entry {@code non-null;} the entry to set at {@code n}
*/
public void set(int n, Entry entry) {
set0(n, entry);
}
/** {@inheritDoc} */
public int compareTo(CatchHandlerList other) {
if (this == other) {
// Easy out.
return 0;
}
int thisSize = size();
int otherSize = other.size();
int checkSize = Math.min(thisSize, otherSize);
for (int i = 0; i < checkSize; i++) {
Entry thisEntry = get(i);
Entry otherEntry = other.get(i);
int compare = thisEntry.compareTo(otherEntry);
if (compare != 0) {
return compare;
}
}
if (thisSize < otherSize) {
return -1;
} else if (thisSize > otherSize) {
return 1;
}
return 0;
}
/**
* Entry in the list.
*/
public static class Entry implements Comparable {
/** {@code non-null;} type of exception handled */
private final CstType exceptionType;
/** {@code >= 0;} exception handler address */
private final int handler;
/**
* Constructs an instance.
*
* @param exceptionType {@code non-null;} type of exception handled
* @param handler {@code >= 0;} exception handler address
*/
public Entry(CstType exceptionType, int handler) {
if (handler < 0) {
throw new IllegalArgumentException("handler < 0");
}
if (exceptionType == null) {
throw new NullPointerException("exceptionType == null");
}
this.handler = handler;
this.exceptionType = exceptionType;
}
/** {@inheritDoc} */
@Override
public int hashCode() {
return (handler * 31) + exceptionType.hashCode();
}
/** {@inheritDoc} */
@Override
public boolean equals(Object other) {
if (other instanceof Entry) {
return (compareTo((Entry) other) == 0);
}
return false;
}
/** {@inheritDoc} */
public int compareTo(Entry other) {
if (handler < other.handler) {
return -1;
} else if (handler > other.handler) {
return 1;
}
return exceptionType.compareTo(other.exceptionType);
}
/**
* Gets the exception type handled.
*
* @return {@code non-null;} the exception type
*/
public CstType getExceptionType() {
return exceptionType;
}
/**
* Gets the handler address.
*
* @return {@code >= 0;} the handler address
*/
public int getHandler() {
return handler;
}
}
}