hotspot/src/cpu/x86/vm/vtableStubs_x86_32.cpp
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6941466: Oracle rebranding changes for Hotspot repositories Summary: Change all the Sun copyrights to Oracle copyright Reviewed-by: ohair
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/*
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 * Copyright (c) 1997, 2009, 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 "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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// These stubs are used by the compiler only.
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// Argument registers, which must be preserved:
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//   rcx - receiver (always first argument)
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//   rdx - second argument (if any)
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// Other registers that might be usable:
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//   rax - inline cache register (is interface for itable stub)
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//   rbx - method (used when calling out to interpreter)
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// Available now, but may become callee-save at some point:
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//   rsi, rdi
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// Note that rax and rdx are also used for return values.
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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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  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 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, itable_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(rsi, Address(rcx, oopDesc::klass_offset_in_bytes()));
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  // Most registers are in use; we'll use rax, rbx, rsi, rdi
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  // (If we need to make rsi, rdi callee-save, do a push/pop here.)
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  const Register method = rbx;
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  Label throw_icce;
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  // Get methodOop and entrypoint for compiler
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  __ lookup_interface_method(// inputs: rec. class, interface, itable index
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                             rsi, rax, itable_index,
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                             // outputs: method, scan temp. reg
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                             method, rdi,
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                             throw_icce);
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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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  __ jump(RuntimeAddress(StubRoutines::throw_IncompatibleClassChangeError_entry()));
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  masm->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 ? 210 : 16) + (CountCompiledCalls ? 6 : 0);
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  } else {
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    // Itable stub size
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    return (DebugVtables ? 256 : 66) + (CountCompiledCalls ? 6 : 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[65] 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 (> 16) 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]@1
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  //   mov    0x4(%ecx),%esi
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  //   mov    0xe8(%esi),%edi
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  //   lea    0x130(%esi,%edi,4),%edi
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  //   add    $0x7,%edi
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  //   and    $0xfffffff8,%edi
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  //   lea    0x4(%esi),%esi
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  //   mov    (%edi),%ebx
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  //   cmp    %ebx,%eax
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  //   je     success
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  // loop:
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  //   test   %ebx,%ebx
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  //   je     throw_icce
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  //   add    $0x8,%edi
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  //   mov    (%edi),%ebx
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  //   cmp    %ebx,%eax
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  //   jne    loop
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  // success:
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  //   mov    0x4(%edi),%edi
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  //   mov    (%esi,%edi,1),%ebx
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  //   jmp    *0x44(%ebx)
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  // throw_icce:
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  //   jmp    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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}