hotspot/src/cpu/x86/vm/vtableStubs_x86_64.cpp
author hseigel
Thu, 15 Aug 2013 20:04:10 -0400
changeset 19319 0ad35be0733a
parent 14626 0cf4eccf130f
child 19979 ebe1dbb6e1aa
permissions -rw-r--r--
8003424: Enable Class Data Sharing for CompressedOops 8016729: ObjectAlignmentInBytes=16 now forces the use of heap based compressed oops 8005933: The -Xshare:auto option is ignored for -server Summary: Move klass metaspace above the heap and support CDS with compressed klass ptrs. Reviewed-by: coleenp, kvn, mgerdin, tschatzl, stefank
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/*
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 * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "precompiled.hpp"
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#include "asm/macroAssembler.hpp"
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#include "code/vtableStubs.hpp"
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#include "interp_masm_x86_64.hpp"
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#include "memory/resourceArea.hpp"
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#include "oops/instanceKlass.hpp"
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#include "oops/klassVtable.hpp"
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#include "runtime/sharedRuntime.hpp"
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#include "vmreg_x86.inline.hpp"
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#ifdef COMPILER2
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#include "opto/runtime.hpp"
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#endif
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// machine-dependent part of VtableStubs: create VtableStub of correct size and
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// initialize its code
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#define __ masm->
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#ifndef PRODUCT
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extern "C" void bad_compiled_vtable_index(JavaThread* thread,
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                                          oop receiver,
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                                          int index);
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#endif
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VtableStub* VtableStubs::create_vtable_stub(int vtable_index) {
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  const int amd64_code_length = VtableStub::pd_code_size_limit(true);
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  VtableStub* s = new(amd64_code_length) VtableStub(true, vtable_index);
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  ResourceMark rm;
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  CodeBuffer cb(s->entry_point(), amd64_code_length);
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  MacroAssembler* masm = new MacroAssembler(&cb);
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#ifndef PRODUCT
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  if (CountCompiledCalls) {
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    __ incrementl(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr()));
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  }
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#endif
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  // get receiver (need to skip return address on top of stack)
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  assert(VtableStub::receiver_location() == j_rarg0->as_VMReg(), "receiver expected in j_rarg0");
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  // Free registers (non-args) are rax, rbx
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  // get receiver klass
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  address npe_addr = __ pc();
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  __ load_klass(rax, j_rarg0);
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#ifndef PRODUCT
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  if (DebugVtables) {
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    Label L;
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    // check offset vs vtable length
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    __ cmpl(Address(rax, InstanceKlass::vtable_length_offset() * wordSize),
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            vtable_index * vtableEntry::size());
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    __ jcc(Assembler::greater, L);
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    __ movl(rbx, vtable_index);
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    __ call_VM(noreg,
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               CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), j_rarg0, rbx);
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    __ bind(L);
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  }
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#endif // PRODUCT
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  // load Method* and target address
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  const Register method = rbx;
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  __ lookup_virtual_method(rax, vtable_index, method);
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  if (DebugVtables) {
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    Label L;
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    __ cmpptr(method, (int32_t)NULL_WORD);
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    __ jcc(Assembler::equal, L);
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    __ cmpptr(Address(method, Method::from_compiled_offset()), (int32_t)NULL_WORD);
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    __ jcc(Assembler::notZero, L);
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    __ stop("Vtable entry is NULL");
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    __ bind(L);
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  }
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  // rax: receiver klass
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  // rbx: Method*
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  // rcx: receiver
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  address ame_addr = __ pc();
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  __ jmp( Address(rbx, Method::from_compiled_offset()));
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  __ flush();
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  if (PrintMiscellaneous && (WizardMode || Verbose)) {
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    tty->print_cr("vtable #%d at "PTR_FORMAT"[%d] left over: %d",
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                  vtable_index, s->entry_point(),
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                  (int)(s->code_end() - s->entry_point()),
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                  (int)(s->code_end() - __ pc()));
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  }
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  guarantee(__ pc() <= s->code_end(), "overflowed buffer");
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  // shut the door on sizing bugs
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  int slop = 3;  // 32-bit offset is this much larger than an 8-bit one
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  assert(vtable_index > 10 || __ pc() + slop <= s->code_end(), "room for 32-bit offset");
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  s->set_exception_points(npe_addr, ame_addr);
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  return s;
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}
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VtableStub* VtableStubs::create_itable_stub(int itable_index) {
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  // Note well: pd_code_size_limit is the absolute minimum we can get
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  // away with.  If you add code here, bump the code stub size
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  // returned by pd_code_size_limit!
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  const int amd64_code_length = VtableStub::pd_code_size_limit(false);
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  VtableStub* s = new(amd64_code_length) VtableStub(false, itable_index);
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  ResourceMark rm;
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  CodeBuffer cb(s->entry_point(), amd64_code_length);
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  MacroAssembler* masm = new MacroAssembler(&cb);
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#ifndef PRODUCT
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  if (CountCompiledCalls) {
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    __ incrementl(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr()));
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  }
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#endif
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  // Entry arguments:
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  //  rax: Interface
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  //  j_rarg0: Receiver
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  // Free registers (non-args) are rax (interface), rbx
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  // get receiver (need to skip return address on top of stack)
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  assert(VtableStub::receiver_location() == j_rarg0->as_VMReg(), "receiver expected in j_rarg0");
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  // get receiver klass (also an implicit null-check)
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  address npe_addr = __ pc();
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  // Most registers are in use; we'll use rax, rbx, r10, r11
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  // (various calling sequences use r[cd]x, r[sd]i, r[89]; stay away from them)
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  __ load_klass(r10, j_rarg0);
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  // If we take a trap while this arg is on the stack we will not
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  // be able to walk the stack properly. This is not an issue except
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  // when there are mistakes in this assembly code that could generate
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  // a spurious fault. Ask me how I know...
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  const Register method = rbx;
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  Label throw_icce;
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  // Get Method* and entrypoint for compiler
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  __ lookup_interface_method(// inputs: rec. class, interface, itable index
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                             r10, rax, itable_index,
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                             // outputs: method, scan temp. reg
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                             method, r11,
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                             throw_icce);
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  // method (rbx): Method*
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  // j_rarg0: receiver
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#ifdef ASSERT
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  if (DebugVtables) {
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    Label L2;
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    __ cmpptr(method, (int32_t)NULL_WORD);
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    __ jcc(Assembler::equal, L2);
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    __ cmpptr(Address(method, Method::from_compiled_offset()), (int32_t)NULL_WORD);
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    __ jcc(Assembler::notZero, L2);
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    __ stop("compiler entrypoint is null");
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    __ bind(L2);
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  }
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#endif // ASSERT
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  // rbx: Method*
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  // j_rarg0: receiver
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  address ame_addr = __ pc();
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  __ jmp(Address(method, Method::from_compiled_offset()));
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  __ bind(throw_icce);
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  __ jump(RuntimeAddress(StubRoutines::throw_IncompatibleClassChangeError_entry()));
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  __ flush();
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  if (PrintMiscellaneous && (WizardMode || Verbose)) {
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    tty->print_cr("itable #%d at "PTR_FORMAT"[%d] left over: %d",
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                  itable_index, s->entry_point(),
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                  (int)(s->code_end() - s->entry_point()),
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                  (int)(s->code_end() - __ pc()));
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  }
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  guarantee(__ pc() <= s->code_end(), "overflowed buffer");
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  // shut the door on sizing bugs
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  int slop = 3;  // 32-bit offset is this much larger than an 8-bit one
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  assert(itable_index > 10 || __ pc() + slop <= s->code_end(), "room for 32-bit offset");
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  s->set_exception_points(npe_addr, ame_addr);
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  return s;
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}
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int VtableStub::pd_code_size_limit(bool is_vtable_stub) {
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  if (is_vtable_stub) {
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    // Vtable stub size
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    return (DebugVtables ? 512 : 24) + (CountCompiledCalls ? 13 : 0) +
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           (UseCompressedKlassPointers ?  MacroAssembler::instr_size_for_decode_klass_not_null() : 0);
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  } else {
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    // Itable stub size
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    return (DebugVtables ? 512 : 74) + (CountCompiledCalls ? 13 : 0) +
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           (UseCompressedKlassPointers ?  MacroAssembler::instr_size_for_decode_klass_not_null() : 0);
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  }
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  // In order to tune these parameters, run the JVM with VM options
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  // +PrintMiscellaneous and +WizardMode to see information about
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  // actual itable stubs.  Look for lines like this:
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  //   itable #1 at 0x5551212[71] left over: 3
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  // Reduce the constants so that the "left over" number is >=3
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  // for the common cases.
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  // Do not aim at a left-over number of zero, because a
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  // large vtable or itable index (>= 32) will require a 32-bit
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  // immediate displacement instead of an 8-bit one.
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  //
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  // The JVM98 app. _202_jess has a megamorphic interface call.
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  // The itable code looks like this:
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  // Decoding VtableStub itbl[1]@12
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  //   mov    0x8(%rsi),%r10
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  //   mov    0x198(%r10),%r11d
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  //   lea    0x218(%r10,%r11,8),%r11
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  //   lea    0x8(%r10),%r10
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  //   mov    (%r11),%rbx
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  //   cmp    %rbx,%rax
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  //   je     success
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  // loop:
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  //   test   %rbx,%rbx
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  //   je     throw_icce
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  //   add    $0x10,%r11
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  //   mov    (%r11),%rbx
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  //   cmp    %rbx,%rax
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  //   jne    loop
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  // success:
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  //   mov    0x8(%r11),%r11d
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  //   mov    (%r10,%r11,1),%rbx
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  //   jmpq   *0x60(%rbx)
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  // throw_icce:
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  //   jmpq   throw_ICCE_entry
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}
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int VtableStub::pd_code_alignment() {
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  return wordSize;
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}