diff -r 000000000000 -r f90c822e73f8 src/cpu/x86/vm/vtableStubs_x86_32.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/cpu/x86/vm/vtableStubs_x86_32.cpp	Wed Apr 27 01:25:04 2016 +0800
@@ -0,0 +1,264 @@
+/*
+ * Copyright (c) 1997, 2014, 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.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "asm/macroAssembler.hpp"
+#include "code/vtableStubs.hpp"
+#include "interp_masm_x86.hpp"
+#include "memory/resourceArea.hpp"
+#include "oops/instanceKlass.hpp"
+#include "oops/klassVtable.hpp"
+#include "runtime/sharedRuntime.hpp"
+#include "vmreg_x86.inline.hpp"
+#ifdef COMPILER2
+#include "opto/runtime.hpp"
+#endif
+
+// 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
+
+// These stubs are used by the compiler only.
+// Argument registers, which must be preserved:
+//   rcx - receiver (always first argument)
+//   rdx - second argument (if any)
+// Other registers that might be usable:
+//   rax - inline cache register (is interface for itable stub)
+//   rbx - method (used when calling out to interpreter)
+// Available now, but may become callee-save at some point:
+//   rsi, rdi
+// Note that rax and rdx are also used for return values.
+//
+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);
+  // Can be NULL if there is no free space in the code cache.
+  if (s == NULL) {
+    return NULL;
+  }
+
+  ResourceMark rm;
+  CodeBuffer cb(s->entry_point(), i486_code_length);
+  MacroAssembler* masm = new MacroAssembler(&cb);
+
+#ifndef PRODUCT
+
+  if (CountCompiledCalls) {
+    __ incrementl(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();
+  __ movptr(rax, Address(rcx, oopDesc::klass_offset_in_bytes()));
+
+#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 Method* and target address
+  __ lookup_virtual_method(rax, vtable_index, method);
+
+  if (DebugVtables) {
+    Label L;
+    __ cmpptr(method, (int32_t)NULL_WORD);
+    __ jcc(Assembler::equal, L);
+    __ cmpptr(Address(method, Method::from_compiled_offset()), (int32_t)NULL_WORD);
+    __ jcc(Assembler::notZero, L);
+    __ stop("Vtable entry is NULL");
+    __ bind(L);
+  }
+
+  // rax,: receiver klass
+  // method (rbx): Method*
+  // rcx: receiver
+  address ame_addr = __ pc();
+  __ jmp( Address(method, Method::from_compiled_offset()));
+
+  masm->flush();
+
+  if (PrintMiscellaneous && (WizardMode || Verbose)) {
+    tty->print_cr("vtable #%d at "PTR_FORMAT"[%d] left over: %d",
+                  vtable_index, p2i(s->entry_point()),
+                  (int)(s->code_end() - s->entry_point()),
+                  (int)(s->code_end() - __ pc()));
+  }
+  guarantee(__ pc() <= s->code_end(), "overflowed buffer");
+  // shut the door on sizing bugs
+  int slop = 3;  // 32-bit offset is this much larger than an 8-bit one
+  assert(vtable_index > 10 || __ pc() + slop <= s->code_end(), "room for 32-bit offset");
+
+  s->set_exception_points(npe_addr, ame_addr);
+  return s;
+}
+
+
+VtableStub* VtableStubs::create_itable_stub(int itable_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, itable_index);
+  // Can be NULL if there is no free space in the code cache.
+  if (s == NULL) {
+    return NULL;
+  }
+
+  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) {
+    __ incrementl(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();
+  __ movptr(rsi, Address(rcx, oopDesc::klass_offset_in_bytes()));
+
+  // Most registers are in use; we'll use rax, rbx, rsi, rdi
+  // (If we need to make rsi, rdi callee-save, do a push/pop here.)
+  const Register method = rbx;
+  Label throw_icce;
+
+  // Get Method* and entrypoint for compiler
+  __ lookup_interface_method(// inputs: rec. class, interface, itable index
+                             rsi, rax, itable_index,
+                             // outputs: method, scan temp. reg
+                             method, rdi,
+                             throw_icce);
+
+  // method (rbx): Method*
+  // rcx: receiver
+
+#ifdef ASSERT
+  if (DebugVtables) {
+      Label L1;
+      __ cmpptr(method, (int32_t)NULL_WORD);
+      __ jcc(Assembler::equal, L1);
+      __ cmpptr(Address(method, Method::from_compiled_offset()), (int32_t)NULL_WORD);
+      __ jcc(Assembler::notZero, L1);
+      __ stop("Method* is null");
+      __ bind(L1);
+    }
+#endif // ASSERT
+
+  address ame_addr = __ pc();
+  __ jmp(Address(method, Method::from_compiled_offset()));
+
+  __ bind(throw_icce);
+  __ jump(RuntimeAddress(StubRoutines::throw_IncompatibleClassChangeError_entry()));
+  masm->flush();
+
+  if (PrintMiscellaneous && (WizardMode || Verbose)) {
+    tty->print_cr("itable #%d at "PTR_FORMAT"[%d] left over: %d",
+                  itable_index, p2i(s->entry_point()),
+                  (int)(s->code_end() - s->entry_point()),
+                  (int)(s->code_end() - __ pc()));
+  }
+  guarantee(__ pc() <= s->code_end(), "overflowed buffer");
+  // shut the door on sizing bugs
+  int slop = 3;  // 32-bit offset is this much larger than an 8-bit one
+  assert(itable_index > 10 || __ pc() + slop <= s->code_end(), "room for 32-bit offset");
+
+  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 ? 256 : 66) + (CountCompiledCalls ? 6 : 0);
+  }
+  // In order to tune these parameters, run the JVM with VM options
+  // +PrintMiscellaneous and +WizardMode to see information about
+  // actual itable stubs.  Look for lines like this:
+  //   itable #1 at 0x5551212[65] left over: 3
+  // Reduce the constants so that the "left over" number is >=3
+  // for the common cases.
+  // Do not aim at a left-over number of zero, because a
+  // large vtable or itable index (> 16) will require a 32-bit
+  // immediate displacement instead of an 8-bit one.
+  //
+  // The JVM98 app. _202_jess has a megamorphic interface call.
+  // The itable code looks like this:
+  // Decoding VtableStub itbl[1]@1
+  //   mov    0x4(%ecx),%esi
+  //   mov    0xe8(%esi),%edi
+  //   lea    0x130(%esi,%edi,4),%edi
+  //   add    $0x7,%edi
+  //   and    $0xfffffff8,%edi
+  //   lea    0x4(%esi),%esi
+  //   mov    (%edi),%ebx
+  //   cmp    %ebx,%eax
+  //   je     success
+  // loop:
+  //   test   %ebx,%ebx
+  //   je     throw_icce
+  //   add    $0x8,%edi
+  //   mov    (%edi),%ebx
+  //   cmp    %ebx,%eax
+  //   jne    loop
+  // success:
+  //   mov    0x4(%edi),%edi
+  //   mov    (%esi,%edi,1),%ebx
+  //   jmp    *0x44(%ebx)
+  // throw_icce:
+  //   jmp    throw_ICCE_entry
+}
+
+int VtableStub::pd_code_alignment() {
+  return wordSize;
+}