jdk8-mips64-public/hotspot: src/cpu/x86/vm/vtableStubs_x86

src/cpu/x86/vm/vtableStubs_x86_64.cpp@f8236e79048a (annotated)

src/cpu/x86/vm/vtableStubs_x86_64.cpp

Wed, 05 Dec 2007 09:00:00 -0800

author: dcubed
date: Wed, 05 Dec 2007 09:00:00 -0800
changeset 451: f8236e79048a
parent 435: a61af66fc99e
child 548: ba764ed4b6f2
permissions: -rw-r--r--

6664627: Merge changes made only in hotspot 11 forward to jdk 7
Reviewed-by: jcoomes

 /*
  * Copyright 2003-2006 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_64.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
 VtableStub* VtableStubs::create_vtable_stub(int vtable_index) {
   const int amd64_code_length = VtableStub::pd_code_size_limit(true);
   VtableStub* s = new(amd64_code_length) VtableStub(true, vtable_index);
   ResourceMark rm;
   CodeBuffer cb(s->entry_point(), amd64_code_length);
   MacroAssembler* masm = new MacroAssembler(&cb);
 #ifndef PRODUCT
   if (CountCompiledCalls) {
     __ incrementl(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr()));
   }
 #endif
   // get receiver (need to skip return address on top of stack)
   assert(VtableStub::receiver_location() == j_rarg0->as_VMReg(), "receiver expected in j_rarg0");
   // Free registers (non-args) are rax, rbx
   // get receiver klass
   address npe_addr = __ pc();
   __ movq(rax, Address(j_rarg0, 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), j_rarg0, rbx);
     __ bind(L);
   }
 #endif // PRODUCT
   // load methodOop and target address
   const Register method = rbx;
   __ movq(method, Address(rax,
                           entry_offset * wordSize +
                           vtableEntry::method_offset_in_bytes()));
   if (DebugVtables) {
     Label L;
     __ cmpq(method, (int)NULL);
     __ jcc(Assembler::equal, L);
     __ cmpq(Address(method, methodOopDesc::from_compiled_offset()), (int)NULL_WORD);
     __ jcc(Assembler::notZero, L);
     __ stop("Vtable entry is NULL");
     __ bind(L);
   }
   // rax: receiver klass
   // rbx: methodOop
   // rcx: receiver
   address ame_addr = __ pc();
   __ jmp( Address(rbx, methodOopDesc::from_compiled_offset()));
   __ 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 amd64_code_length = VtableStub::pd_code_size_limit(false);
   VtableStub* s = new(amd64_code_length) VtableStub(false, vtable_index);
   ResourceMark rm;
   CodeBuffer cb(s->entry_point(), amd64_code_length);
   MacroAssembler* masm = new MacroAssembler(&cb);
 #ifndef PRODUCT
   if (CountCompiledCalls) {
     __ incrementl(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr()));
   }
 #endif
   // Entry arguments:
   //  rax: Interface
   //  j_rarg0: Receiver
   // Free registers (non-args) are rax (interface), rbx
   // get receiver (need to skip return address on top of stack)
   assert(VtableStub::receiver_location() == j_rarg0->as_VMReg(), "receiver expected in j_rarg0");
   // get receiver klass (also an implicit null-check)
   address npe_addr = __ pc();
   __ movq(rbx, Address(j_rarg0, oopDesc::klass_offset_in_bytes()));
   // If we take a trap while this arg is on the stack we will not
   // be able to walk the stack properly. This is not an issue except
   // when there are mistakes in this assembly code that could generate
   // a spurious fault. Ask me how I know...
   __ pushq(j_rarg1);     // Most registers are in use, so save one
   // compute itable entry offset (in words)
   const int base = instanceKlass::vtable_start_offset() * wordSize;
   assert(vtableEntry::size() * wordSize == 8,
          "adjust the scaling in the code below");
   // Get length of vtable
   __ movl(j_rarg1,
           Address(rbx, instanceKlass::vtable_length_offset() * wordSize));
   __ leaq(rbx, Address(rbx, j_rarg1, Address::times_8, base));
   if (HeapWordsPerLong > 1) {
     // Round up to align_object_offset boundary
     __ round_to_q(rbx, BytesPerLong);
   }
   Label hit, next, entry, throw_icce;
   __ jmpb(entry);
   __ bind(next);
   __ addq(rbx, itableOffsetEntry::size() * wordSize);
   __ bind(entry);
   // If the entry is NULL then we've reached the end of the table
   // without finding the expected interface, so throw an exception
   __ movq(j_rarg1, Address(rbx, itableOffsetEntry::interface_offset_in_bytes()));
   __ testq(j_rarg1, j_rarg1);
   __ jcc(Assembler::zero, throw_icce);
   __ cmpq(rax, j_rarg1);
   __ jccb(Assembler::notEqual, next);
   // We found a hit, move offset into j_rarg1
   __ movl(j_rarg1, 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
   // Get klass pointer again
   __ movq(rax, Address(j_rarg0, oopDesc::klass_offset_in_bytes()));
   const Register method = rbx;
   __ movq(method, Address(rax, j_rarg1, Address::times_1, method_offset));
   // Restore saved register, before possible trap.
   __ popq(j_rarg1);
   // method (rbx): methodOop
   // j_rarg0: receiver
 #ifdef ASSERT
   if (DebugVtables) {
     Label L2;
     __ cmpq(method, (int)NULL);
     __ jcc(Assembler::equal, L2);
     __ cmpq(Address(method, methodOopDesc::from_compiled_offset()), (int)NULL_WORD);
     __ jcc(Assembler::notZero, L2);
     __ stop("compiler entrypoint is null");
     __ bind(L2);
   }
 #endif // ASSERT
   // rbx: methodOop
   // j_rarg0: receiver
   address ame_addr = __ pc();
   __ jmp(Address(method, methodOopDesc::from_compiled_offset()));
   __ bind(throw_icce);
   // Restore saved register
   __ popq(j_rarg1);
   __ jump(RuntimeAddress(StubRoutines::throw_IncompatibleClassChangeError_entry()));
   __ flush();
   guarantee(__ pc() <= s->code_end(), "overflowed buffer");
   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 ? 512 : 24) + (CountCompiledCalls ? 13 : 0);
   } else {
     // Itable stub size
     return (DebugVtables ? 636 : 72) + (CountCompiledCalls ? 13 : 0);
   }
 }
 int VtableStub::pd_code_alignment() {
   return wordSize;
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/cpu/x86/vm/vtableStubs_x86_64.cpp@f8236e79048a (annotated)

src/cpu/x86/vm/vtableStubs_x86_64.cpp