hotspot/src/cpu/x86/vm/vtableStubs_x86_32.cpp
author never
Wed, 27 Aug 2008 00:21:55 -0700
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child 1217 5eb97f366a6a
permissions -rw-r--r--
5108146: Merge i486 and amd64 cpu directories 6459804: Want client (c1) compiler for x86_64 (amd64) for faster start-up Reviewed-by: kvn
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/*
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 * Copyright 1997-2006 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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 * CA 95054 USA or visit www.sun.com if you need additional information or
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 * have any questions.
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 *
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 */
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#include "incls/_precompiled.incl"
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#include "incls/_vtableStubs_x86_32.cpp.incl"
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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, oop receiver, int index);
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#endif
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// used by compiler only; may use only caller saved registers rax, rbx, rcx.
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// rdx holds first int arg, rsi, rdi, rbp are callee-save & must be preserved.
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// Leave receiver in rcx; required behavior when +OptoArgsInRegisters
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// is modifed to put first oop in rcx.
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//
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VtableStub* VtableStubs::create_vtable_stub(int vtable_index) {
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  const int i486_code_length = VtableStub::pd_code_size_limit(true);
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  VtableStub* s = new(i486_code_length) VtableStub(true, vtable_index);
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  ResourceMark rm;
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  CodeBuffer cb(s->entry_point(), i486_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 /* PRODUCT */
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  // get receiver (need to skip return address on top of stack)
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  assert(VtableStub::receiver_location() == rcx->as_VMReg(), "receiver expected in rcx");
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  // get receiver klass
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  address npe_addr = __ pc();
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  __ movptr(rax, Address(rcx, oopDesc::klass_offset_in_bytes()));
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  // compute entry offset (in words)
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  int entry_offset = instanceKlass::vtable_start_offset() + vtable_index*vtableEntry::size();
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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), 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, CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), rcx, rbx);
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    __ bind(L);
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  }
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#endif // PRODUCT
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  const Register method = rbx;
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  // load methodOop and target address
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  __ movptr(method, Address(rax, entry_offset*wordSize + vtableEntry::method_offset_in_bytes()));
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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, methodOopDesc::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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  // method (rbx): methodOop
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  // rcx: receiver
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  address ame_addr = __ pc();
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  __ jmp( Address(method, methodOopDesc::from_compiled_offset()));
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  masm->flush();
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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 vtable_index) {
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  // Note well: pd_code_size_limit is the absolute minimum we can get away with.  If you
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  //            add code here, bump the code stub size returned by pd_code_size_limit!
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  const int i486_code_length = VtableStub::pd_code_size_limit(false);
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  VtableStub* s = new(i486_code_length) VtableStub(false, vtable_index);
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  ResourceMark rm;
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  CodeBuffer cb(s->entry_point(), i486_code_length);
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  MacroAssembler* masm = new MacroAssembler(&cb);
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  // Entry arguments:
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  //  rax,: Interface
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  //  rcx: Receiver
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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 /* PRODUCT */
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  // get receiver (need to skip return address on top of stack)
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  assert(VtableStub::receiver_location() == rcx->as_VMReg(), "receiver expected in rcx");
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  // get receiver klass (also an implicit null-check)
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  address npe_addr = __ pc();
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  __ movptr(rbx, Address(rcx, oopDesc::klass_offset_in_bytes()));
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  __ mov(rsi, rbx);   // Save klass in free register
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  // Most registers are in use, so save a few
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  __ push(rdx);
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  // compute itable entry offset (in words)
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  const int base = instanceKlass::vtable_start_offset() * wordSize;
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  assert(vtableEntry::size() * wordSize == 4, "adjust the scaling in the code below");
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  __ movl(rdx, Address(rbx, instanceKlass::vtable_length_offset() * wordSize)); // Get length of vtable
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  __ lea(rbx, Address(rbx, rdx, Address::times_ptr, base));
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  if (HeapWordsPerLong > 1) {
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    // Round up to align_object_offset boundary
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    __ round_to(rbx, BytesPerLong);
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  }
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  Label hit, next, entry, throw_icce;
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  __ jmpb(entry);
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  __ bind(next);
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  __ addptr(rbx, itableOffsetEntry::size() * wordSize);
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  __ bind(entry);
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  // If the entry is NULL then we've reached the end of the table
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  // without finding the expected interface, so throw an exception
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  __ movptr(rdx, Address(rbx, itableOffsetEntry::interface_offset_in_bytes()));
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  __ testptr(rdx, rdx);
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  __ jcc(Assembler::zero, throw_icce);
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  __ cmpptr(rax, rdx);
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  __ jcc(Assembler::notEqual, next);
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  // We found a hit, move offset into rbx,
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  __ movl(rdx, Address(rbx, itableOffsetEntry::offset_offset_in_bytes()));
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  // Compute itableMethodEntry.
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  const int method_offset = (itableMethodEntry::size() * wordSize * vtable_index) + itableMethodEntry::method_offset_in_bytes();
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  // Get methodOop and entrypoint for compiler
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  const Register method = rbx;
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  __ movptr(method, Address(rsi, rdx, Address::times_1, method_offset));
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  // Restore saved register, before possible trap.
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  __ pop(rdx);
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  // method (rbx): methodOop
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  // rcx: receiver
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#ifdef ASSERT
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  if (DebugVtables) {
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      Label L1;
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      __ cmpptr(method, (int32_t)NULL_WORD);
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      __ jcc(Assembler::equal, L1);
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      __ cmpptr(Address(method, methodOopDesc::from_compiled_offset()), (int32_t)NULL_WORD);
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      __ jcc(Assembler::notZero, L1);
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      __ stop("methodOop is null");
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      __ bind(L1);
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    }
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#endif // ASSERT
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  address ame_addr = __ pc();
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  __ jmp(Address(method, methodOopDesc::from_compiled_offset()));
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  __ bind(throw_icce);
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  // Restore saved register
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  __ pop(rdx);
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  __ jump(RuntimeAddress(StubRoutines::throw_IncompatibleClassChangeError_entry()));
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  masm->flush();
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  guarantee(__ pc() <= s->code_end(), "overflowed buffer");
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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 ? 210 : 16) + (CountCompiledCalls ? 6 : 0);
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  } else {
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    // Itable stub size
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    return (DebugVtables ? 144 : 64) + (CountCompiledCalls ? 6 : 0);
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  }
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}
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int VtableStub::pd_code_alignment() {
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  return wordSize;
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}