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/*
* Copyright (c) 2003, 2012, 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
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
package sun.jvm.hotspot.debugger.linux.x86;
import sun.jvm.hotspot.debugger.*;
import sun.jvm.hotspot.debugger.linux.*;
import sun.jvm.hotspot.debugger.cdbg.*;
import sun.jvm.hotspot.debugger.cdbg.basic.*;
import sun.jvm.hotspot.debugger.x86.*;
final public class LinuxX86CFrame extends BasicCFrame {
// package/class internals only
public LinuxX86CFrame(LinuxDebugger dbg, Address ebp, Address pc) {
super(dbg.getCDebugger());
this.ebp = ebp;
this.pc = pc;
this.dbg = dbg;
}
// override base class impl to avoid ELF parsing
public ClosestSymbol closestSymbolToPC() {
// try native lookup in debugger.
return dbg.lookup(dbg.getAddressValue(pc()));
}
public Address pc() {
return pc;
}
public Address localVariableBase() {
return ebp;
}
public CFrame sender(ThreadProxy thread) {
X86ThreadContext context = (X86ThreadContext) thread.getContext();
Address esp = context.getRegisterAsAddress(X86ThreadContext.ESP);
if ( (ebp == null) || ebp.lessThan(esp) ) {
return null;
}
Address nextEBP = ebp.getAddressAt( 0 * ADDRESS_SIZE);
if (nextEBP == null) {
return null;
}
Address nextPC = ebp.getAddressAt( 1 * ADDRESS_SIZE);
if (nextPC == null) {
return null;
}
return new LinuxX86CFrame(dbg, nextEBP, nextPC);
}
private static final int ADDRESS_SIZE = 4;
private Address pc;
private Address ebp;
private LinuxDebugger dbg;
}
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