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// natBreakpoint.cc - C++ side of Breakpoint

/* Copyright (C) 2006, 2007  Free Software Foundation

   This file is part of libgcj.

This software is copyrighted work licensed under the terms of the

Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for

details.  */

#include <config.h>

#include <gcj/cni.h>

#include <gcj/method.h>

#include <java-interp.h>

#include <java-insns.h>

#include <java-assert.h>

#include <jvmti.h>

#include <gnu/gcj/jvmti/Breakpoint.h>

#include <gnu/gcj/jvmti/BreakpointManager.h>

static _Jv_InterpMethod *

get_interp_method (jlong method)

{

  jmethodID id = reinterpret_cast<jmethodID> (method);

  jclass klass = _Jv_GetMethodDeclaringClass (id);

  JvAssert (_Jv_IsInterpretedClass (klass));

  _Jv_MethodBase *base

    = _Jv_FindInterpreterMethod (klass, id);

  JvAssert (base != NULL);

  return reinterpret_cast<_Jv_InterpMethod *> (base);

}

void

gnu::gcj::jvmti::Breakpoint::_save_insn ()

{

  _Jv_InterpMethod *imeth = get_interp_method (method);

  // copy contents of insn at location into data

  pc_t code = imeth->get_insn (location);

  data = (RawDataManaged *) JvAllocBytes (sizeof (*code));

  memcpy (data, code, sizeof (*code));

}

void

gnu::gcj::jvmti::Breakpoint::install ()

{

  _save_insn ();

  _Jv_InterpMethod *imeth = get_interp_method (method);

  imeth->install_break (location);

}

void

gnu::gcj::jvmti::Breakpoint::remove ()

{

  _Jv_InterpMethod *imeth = get_interp_method (method);

  imeth->set_insn (location, reinterpret_cast<pc_t> (data));

}

#ifdef DIRECT_THREADED

void

_Jv_RewriteBreakpointInsn (jmethodID mid, jlocation loc, pc_t new_insn)

{

  using namespace ::gnu::gcj::jvmti;

  Breakpoint *bp

    = BreakpointManager::getBreakpoint (reinterpret_cast<jlong> (mid), loc);

  if (bp != NULL)

    {

      pc_t old_insn = (pc_t) bp->data;

      old_insn->insn = new_insn;

    }

}

#endif // DIRECT_THREADED