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 * Copyright (c) 2016, 2018, 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.
 *
 * 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
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 */


package org.graalvm.compiler.bytecode;

import jdk.vm.ci.meta.ConstantPool;
import jdk.vm.ci.meta.ExceptionHandler;
import jdk.vm.ci.meta.LineNumberTable;
import jdk.vm.ci.meta.LocalVariableTable;
import jdk.vm.ci.meta.ProfilingInfo;
import jdk.vm.ci.meta.ResolvedJavaMethod;

An interface for accessing the bytecode properties of a ResolvedJavaMethod that allows for different properties than those returned by ResolvedJavaMethod. Since the bytecode accessed directly from ResolvedJavaMethod may have been subject to bytecode instrumentation and VM rewriting, this indirection can be used to enable access to the original bytecode of a method (i.e., as defined in a class file). /**
 * An interface for accessing the bytecode properties of a {@link ResolvedJavaMethod} that allows
 * for different properties than those returned by {@link ResolvedJavaMethod}. Since the bytecode
 * accessed directly from {@link ResolvedJavaMethod} may have been subject to bytecode
 * instrumentation and VM rewriting, this indirection can be used to enable access to the original
 * bytecode of a method (i.e., as defined in a class file).
 */
public interface Bytecode {

    
Gets the method this object supplies bytecode for.
/**
     * Gets the method this object supplies bytecode for.
     */
    ResolvedJavaMethod getMethod();

    byte[] getCode();

    int getCodeSize();

    int getMaxStackSize();

    int getMaxLocals();

    ConstantPool getConstantPool();

    LineNumberTable getLineNumberTable();

    LocalVariableTable getLocalVariableTable();

    StackTraceElement asStackTraceElement(int bci);

    ProfilingInfo getProfilingInfo();

    ExceptionHandler[] getExceptionHandlers();

    
Gets the BytecodeProvider from which this object was acquired. /**
     * Gets the {@link BytecodeProvider} from which this object was acquired.
     */
    BytecodeProvider getOrigin();

    static String toLocation(Bytecode bytecode, int bci) {
        return appendLocation(new StringBuilder(), bytecode, bci).toString();
    }

    static StringBuilder appendLocation(StringBuilder sb, Bytecode bytecode, int bci) {
        if (bytecode != null) {
            StackTraceElement ste = bytecode.asStackTraceElement(bci);
            if (ste.getFileName() != null && ste.getLineNumber() > 0) {
                sb.append(ste);
            } else {
                sb.append(bytecode.getMethod().format("%H.%n(%p)"));
            }
        } else {
            sb.append("Null method");
        }
        return sb.append(" [bci: ").append(bci).append(']');
    }
}