diff -r fd16c54261b3 -r 489c9b5090e2 hotspot/src/cpu/x86/vm/vtableStubs_x86_32.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/cpu/x86/vm/vtableStubs_x86_32.cpp	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,216 @@
+/*
+ * Copyright 1997-2006 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+#include "incls/_precompiled.incl"
+#include "incls/_vtableStubs_x86_32.cpp.incl"
+
+// machine-dependent part of VtableStubs: create VtableStub of correct size and
+// initialize its code
+
+#define __ masm->
+
+#ifndef PRODUCT
+extern "C" void bad_compiled_vtable_index(JavaThread* thread, oop receiver, int index);
+#endif
+
+// used by compiler only; may use only caller saved registers rax, rbx, rcx.
+// rdx holds first int arg, rsi, rdi, rbp are callee-save & must be preserved.
+// Leave receiver in rcx; required behavior when +OptoArgsInRegisters
+// is modifed to put first oop in rcx.
+//
+VtableStub* VtableStubs::create_vtable_stub(int vtable_index) {
+  const int i486_code_length = VtableStub::pd_code_size_limit(true);
+  VtableStub* s = new(i486_code_length) VtableStub(true, vtable_index);
+  ResourceMark rm;
+  CodeBuffer cb(s->entry_point(), i486_code_length);
+  MacroAssembler* masm = new MacroAssembler(&cb);
+
+#ifndef PRODUCT
+
+  if (CountCompiledCalls) {
+    __ increment(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr()));
+  }
+#endif /* PRODUCT */
+
+  // get receiver (need to skip return address on top of stack)
+  assert(VtableStub::receiver_location() == rcx->as_VMReg(), "receiver expected in rcx");
+
+  // get receiver klass
+  address npe_addr = __ pc();
+  __ movl(rax, Address(rcx, oopDesc::klass_offset_in_bytes()));
+  // compute entry offset (in words)
+  int entry_offset = instanceKlass::vtable_start_offset() + vtable_index*vtableEntry::size();
+#ifndef PRODUCT
+  if (DebugVtables) {
+    Label L;
+    // check offset vs vtable length
+    __ cmpl(Address(rax, instanceKlass::vtable_length_offset()*wordSize), vtable_index*vtableEntry::size());
+    __ jcc(Assembler::greater, L);
+    __ movl(rbx, vtable_index);
+    __ call_VM(noreg, CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), rcx, rbx);
+    __ bind(L);
+  }
+#endif // PRODUCT
+
+  const Register method = rbx;
+
+  // load methodOop and target address
+  __ movl(method, Address(rax, entry_offset*wordSize + vtableEntry::method_offset_in_bytes()));
+  if (DebugVtables) {
+    Label L;
+    __ cmpl(method, NULL_WORD);
+    __ jcc(Assembler::equal, L);
+    __ cmpl(Address(method, methodOopDesc::from_compiled_offset()), NULL_WORD);
+    __ jcc(Assembler::notZero, L);
+    __ stop("Vtable entry is NULL");
+    __ bind(L);
+  }
+
+  // rax,: receiver klass
+  // method (rbx): methodOop
+  // rcx: receiver
+  address ame_addr = __ pc();
+  __ jmp( Address(method, methodOopDesc::from_compiled_offset()));
+
+  masm->flush();
+  s->set_exception_points(npe_addr, ame_addr);
+  return s;
+}
+
+
+VtableStub* VtableStubs::create_itable_stub(int vtable_index) {
+  // Note well: pd_code_size_limit is the absolute minimum we can get away with.  If you
+  //            add code here, bump the code stub size returned by pd_code_size_limit!
+  const int i486_code_length = VtableStub::pd_code_size_limit(false);
+  VtableStub* s = new(i486_code_length) VtableStub(false, vtable_index);
+  ResourceMark rm;
+  CodeBuffer cb(s->entry_point(), i486_code_length);
+  MacroAssembler* masm = new MacroAssembler(&cb);
+
+  // Entry arguments:
+  //  rax,: Interface
+  //  rcx: Receiver
+
+#ifndef PRODUCT
+  if (CountCompiledCalls) {
+    __ increment(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr()));
+  }
+#endif /* PRODUCT */
+  // get receiver (need to skip return address on top of stack)
+
+  assert(VtableStub::receiver_location() == rcx->as_VMReg(), "receiver expected in rcx");
+
+  // get receiver klass (also an implicit null-check)
+  address npe_addr = __ pc();
+  __ movl(rbx, Address(rcx, oopDesc::klass_offset_in_bytes()));
+
+  __ movl(rsi, rbx);   // Save klass in free register
+  // Most registers are in use, so save a few
+  __ pushl(rdx);
+  // compute itable entry offset (in words)
+  const int base = instanceKlass::vtable_start_offset() * wordSize;
+  assert(vtableEntry::size() * wordSize == 4, "adjust the scaling in the code below");
+  __ movl(rdx, Address(rbx, instanceKlass::vtable_length_offset() * wordSize)); // Get length of vtable
+  __ leal(rbx, Address(rbx, rdx, Address::times_4, base));
+  if (HeapWordsPerLong > 1) {
+    // Round up to align_object_offset boundary
+    __ round_to(rbx, BytesPerLong);
+  }
+
+  Label hit, next, entry;
+
+  __ jmp(entry);
+
+  __ bind(next);
+  __ addl(rbx, itableOffsetEntry::size() * wordSize);
+
+  __ bind(entry);
+
+#ifdef ASSERT
+    // Check that the entry is non-null
+  if (DebugVtables) {
+    Label L;
+    __ pushl(rbx);
+    __ movl(rbx, Address(rbx, itableOffsetEntry::interface_offset_in_bytes()));
+    __ testl(rbx, rbx);
+    __ jcc(Assembler::notZero, L);
+    __ stop("null entry point found in itable's offset table");
+    __ bind(L);
+    __ popl(rbx);
+  }
+#endif
+  __ cmpl(rax, Address(rbx, itableOffsetEntry::interface_offset_in_bytes()));
+  __ jcc(Assembler::notEqual, next);
+
+  // We found a hit, move offset into rbx,
+  __ movl(rdx, Address(rbx, itableOffsetEntry::offset_offset_in_bytes()));
+
+  // Compute itableMethodEntry.
+  const int method_offset = (itableMethodEntry::size() * wordSize * vtable_index) + itableMethodEntry::method_offset_in_bytes();
+
+  // Get methodOop and entrypoint for compiler
+  const Register method = rbx;
+  __ movl(method, Address(rsi, rdx, Address::times_1, method_offset));
+
+  // Restore saved register, before possible trap.
+  __ popl(rdx);
+
+  // method (rbx): methodOop
+  // rcx: receiver
+
+#ifdef ASSERT
+  if (DebugVtables) {
+      Label L1;
+      __ cmpl(method, NULL_WORD);
+      __ jcc(Assembler::equal, L1);
+      __ cmpl(Address(method, methodOopDesc::from_compiled_offset()), NULL_WORD);
+      __ jcc(Assembler::notZero, L1);
+      __ stop("methodOop is null");
+      __ bind(L1);
+    }
+#endif // ASSERT
+
+  address ame_addr = __ pc();
+  __ jmp(Address(method, methodOopDesc::from_compiled_offset()));
+
+  masm->flush();
+  s->set_exception_points(npe_addr, ame_addr);
+  return s;
+}
+
+
+
+int VtableStub::pd_code_size_limit(bool is_vtable_stub) {
+  if (is_vtable_stub) {
+    // Vtable stub size
+    return (DebugVtables ? 210 : 16) + (CountCompiledCalls ? 6 : 0);
+  } else {
+    // Itable stub size
+    return (DebugVtables ? 140 : 55) + (CountCompiledCalls ? 6 : 0);
+  }
+}
+
+int VtableStub::pd_code_alignment() {
+  return wordSize;
+}