hotspot/src/cpu/ppc/vm/metaspaceShared_ppc.cpp

/*
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 * published by the Free Software Foundation.
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 * 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.
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#include "precompiled.hpp"
#include "asm/macroAssembler.inline.hpp"
#include "asm/codeBuffer.hpp"
#include "memory/metaspaceShared.hpp"

// Generate the self-patching vtable method:
//
// This method will be called (as any other Klass virtual method) with
// the Klass itself as the first argument.  Example:
//
//   oop obj;
//   int size = obj->klass()->klass_part()->oop_size(this);
//
// for which the virtual method call is Klass::oop_size();
//
// The dummy method is called with the Klass object as the first
// operand, and an object as the second argument.
//

//=====================================================================

// All of the dummy methods in the vtable are essentially identical,
// differing only by an ordinal constant, and they bear no releationship
// to the original method which the caller intended. Also, there needs
// to be 'vtbl_list_size' instances of the vtable in order to
// differentiate between the 'vtable_list_size' original Klass objects.

#define __ masm->

void MetaspaceShared::generate_vtable_methods(void** vtbl_list,
                                              void** vtable,
                                              char** md_top,
                                              char* md_end,
                                              char** mc_top,
                                              char* mc_end) {
  intptr_t vtable_bytes = (num_virtuals * vtbl_list_size) * sizeof(void*);
  *(intptr_t *)(*md_top) = vtable_bytes;
  *md_top += sizeof(intptr_t);
  void** dummy_vtable = (void**)*md_top;
  *vtable = dummy_vtable;
  *md_top += vtable_bytes;

  // Get ready to generate dummy methods.

  CodeBuffer cb((unsigned char*)*mc_top, mc_end - *mc_top);
  MacroAssembler* masm = new MacroAssembler(&cb);

  // There are more general problems with CDS on ppc, so I can not
  // really test this. But having this instead of Unimplementd() allows
  // us to pass TestOptionsWithRanges.java.
  __ unimplemented();
}