/*
* Copyright (c) 1995, 2003, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.tools.java;
import java.io.*;
/**
* WARNING: The contents of this source file are not part of any
* supported API. Code that depends on them does so at its own risk:
* they are subject to change or removal without notice.
*/
public class BinaryCode implements Constants {
int maxStack; // maximum stack used by code
int maxLocals; // maximum locals used by code
BinaryExceptionHandler exceptionHandlers[];
BinaryAttribute atts; // code attributes
BinaryConstantPool cpool; // constant pool of the class
byte code[]; // the byte code
/**
* Construct the binary code from the code attribute
*/
public
BinaryCode(byte data[], BinaryConstantPool cpool, Environment env) {
DataInputStream in = new DataInputStream(new ByteArrayInputStream(data));
try {
this.cpool = cpool;
// JVM 4.7.4 CodeAttribute.max_stack
this.maxStack = in.readUnsignedShort();
// JVM 4.7.4 CodeAttribute.max_locals
this.maxLocals = in.readUnsignedShort();
// JVM 4.7.4 CodeAttribute.code_length
int code_length = in.readInt();
this.code = new byte[code_length];
// JVM 4.7.4 CodeAttribute.code[]
in.read(this.code);
// JVM 4.7.4 CodeAttribute.exception_table_length
int exception_count = in.readUnsignedShort();
this.exceptionHandlers = new BinaryExceptionHandler[exception_count];
for (int i = 0; i < exception_count; i++) {
// JVM 4.7.4 CodeAttribute.exception_table.start_pc
int start = in.readUnsignedShort();
// JVM 4.7.4 CodeAttribute.exception_table.end_pc
int end = in.readUnsignedShort();
// JVM 4.7.4 CodeAttribute.exception_table.handler_pc
int handler = in.readUnsignedShort();
// JVM 4.7.4 CodeAttribute.exception_table.catch_type
ClassDeclaration xclass = cpool.getDeclaration(env, in.readUnsignedShort());
this.exceptionHandlers[i] =
new BinaryExceptionHandler(start, end, handler, xclass);
}
this.atts = BinaryAttribute.load(in, cpool, ~0);
if (in.available() != 0) {
System.err.println("Should have exhausted input stream!");
}
} catch (IOException e) {
throw new CompilerError(e);
}
}
/**
* Accessors
*/
public BinaryExceptionHandler getExceptionHandlers()[] {
return exceptionHandlers;
}
public byte getCode()[] { return code; }
public int getMaxStack() { return maxStack; }
public int getMaxLocals() { return maxLocals; }
public BinaryAttribute getAttributes() { return atts; }
/**
* Load a binary class
*/
public static
BinaryCode load(BinaryMember bf, BinaryConstantPool cpool, Environment env) {
byte code[] = bf.getAttribute(idCode);
return (code != null) ? new BinaryCode(code, cpool, env) : null;
}
}