hotspot/src/cpu/x86/vm/c1_CodeStubs_x86.cpp
author never
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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 1999-2006 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/_c1_CodeStubs_x86.cpp.incl"
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#define __ ce->masm()->
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float ConversionStub::float_zero = 0.0;
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double ConversionStub::double_zero = 0.0;
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void ConversionStub::emit_code(LIR_Assembler* ce) {
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  __ bind(_entry);
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  assert(bytecode() == Bytecodes::_f2i || bytecode() == Bytecodes::_d2i, "other conversions do not require stub");
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  if (input()->is_single_xmm()) {
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    __ comiss(input()->as_xmm_float_reg(),
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              ExternalAddress((address)&float_zero));
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  } else if (input()->is_double_xmm()) {
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    __ comisd(input()->as_xmm_double_reg(),
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              ExternalAddress((address)&double_zero));
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  } else {
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    LP64_ONLY(ShouldNotReachHere());
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    __ push(rax);
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    __ ftst();
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    __ fnstsw_ax();
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    __ sahf();
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    __ pop(rax);
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  }
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  Label NaN, do_return;
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  __ jccb(Assembler::parity, NaN);
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  __ jccb(Assembler::below, do_return);
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  // input is > 0 -> return maxInt
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  // result register already contains 0x80000000, so subtracting 1 gives 0x7fffffff
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  __ decrement(result()->as_register());
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  __ jmpb(do_return);
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  // input is NaN -> return 0
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  __ bind(NaN);
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  __ xorptr(result()->as_register(), result()->as_register());
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  __ bind(do_return);
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  __ jmp(_continuation);
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}
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#ifdef TIERED
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void CounterOverflowStub::emit_code(LIR_Assembler* ce) {
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  __ bind(_entry);
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  ce->store_parameter(_bci, 0);
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  __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::counter_overflow_id)));
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  ce->add_call_info_here(_info);
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  ce->verify_oop_map(_info);
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  __ jmp(_continuation);
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}
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#endif // TIERED
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RangeCheckStub::RangeCheckStub(CodeEmitInfo* info, LIR_Opr index,
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                               bool throw_index_out_of_bounds_exception)
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  : _throw_index_out_of_bounds_exception(throw_index_out_of_bounds_exception)
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  , _index(index)
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{
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  _info = info == NULL ? NULL : new CodeEmitInfo(info);
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}
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void RangeCheckStub::emit_code(LIR_Assembler* ce) {
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  __ bind(_entry);
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  // pass the array index on stack because all registers must be preserved
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  if (_index->is_cpu_register()) {
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    ce->store_parameter(_index->as_register(), 0);
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  } else {
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    ce->store_parameter(_index->as_jint(), 0);
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  }
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  Runtime1::StubID stub_id;
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  if (_throw_index_out_of_bounds_exception) {
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    stub_id = Runtime1::throw_index_exception_id;
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  } else {
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    stub_id = Runtime1::throw_range_check_failed_id;
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  }
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  __ call(RuntimeAddress(Runtime1::entry_for(stub_id)));
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  ce->add_call_info_here(_info);
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  debug_only(__ should_not_reach_here());
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}
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void DivByZeroStub::emit_code(LIR_Assembler* ce) {
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  if (_offset != -1) {
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    ce->compilation()->implicit_exception_table()->append(_offset, __ offset());
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  }
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  __ bind(_entry);
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  __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::throw_div0_exception_id)));
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  ce->add_call_info_here(_info);
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  debug_only(__ should_not_reach_here());
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}
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// Implementation of NewInstanceStub
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NewInstanceStub::NewInstanceStub(LIR_Opr klass_reg, LIR_Opr result, ciInstanceKlass* klass, CodeEmitInfo* info, Runtime1::StubID stub_id) {
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  _result = result;
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  _klass = klass;
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  _klass_reg = klass_reg;
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  _info = new CodeEmitInfo(info);
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  assert(stub_id == Runtime1::new_instance_id                 ||
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         stub_id == Runtime1::fast_new_instance_id            ||
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         stub_id == Runtime1::fast_new_instance_init_check_id,
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         "need new_instance id");
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  _stub_id   = stub_id;
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}
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void NewInstanceStub::emit_code(LIR_Assembler* ce) {
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  assert(__ rsp_offset() == 0, "frame size should be fixed");
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  __ bind(_entry);
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  __ movptr(rdx, _klass_reg->as_register());
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  __ call(RuntimeAddress(Runtime1::entry_for(_stub_id)));
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  ce->add_call_info_here(_info);
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  ce->verify_oop_map(_info);
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  assert(_result->as_register() == rax, "result must in rax,");
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  __ jmp(_continuation);
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}
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// Implementation of NewTypeArrayStub
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NewTypeArrayStub::NewTypeArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info) {
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  _klass_reg = klass_reg;
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  _length = length;
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  _result = result;
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  _info = new CodeEmitInfo(info);
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}
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void NewTypeArrayStub::emit_code(LIR_Assembler* ce) {
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  assert(__ rsp_offset() == 0, "frame size should be fixed");
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  __ bind(_entry);
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  assert(_length->as_register() == rbx, "length must in rbx,");
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  assert(_klass_reg->as_register() == rdx, "klass_reg must in rdx");
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  __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::new_type_array_id)));
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  ce->add_call_info_here(_info);
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  ce->verify_oop_map(_info);
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  assert(_result->as_register() == rax, "result must in rax,");
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  __ jmp(_continuation);
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}
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// Implementation of NewObjectArrayStub
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NewObjectArrayStub::NewObjectArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info) {
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  _klass_reg = klass_reg;
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  _result = result;
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  _length = length;
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  _info = new CodeEmitInfo(info);
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}
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void NewObjectArrayStub::emit_code(LIR_Assembler* ce) {
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  assert(__ rsp_offset() == 0, "frame size should be fixed");
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  __ bind(_entry);
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  assert(_length->as_register() == rbx, "length must in rbx,");
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  assert(_klass_reg->as_register() == rdx, "klass_reg must in rdx");
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  __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::new_object_array_id)));
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  ce->add_call_info_here(_info);
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  ce->verify_oop_map(_info);
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  assert(_result->as_register() == rax, "result must in rax,");
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  __ jmp(_continuation);
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}
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// Implementation of MonitorAccessStubs
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MonitorEnterStub::MonitorEnterStub(LIR_Opr obj_reg, LIR_Opr lock_reg, CodeEmitInfo* info)
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: MonitorAccessStub(obj_reg, lock_reg)
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{
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  _info = new CodeEmitInfo(info);
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}
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void MonitorEnterStub::emit_code(LIR_Assembler* ce) {
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  assert(__ rsp_offset() == 0, "frame size should be fixed");
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  __ bind(_entry);
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  ce->store_parameter(_obj_reg->as_register(),  1);
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  ce->store_parameter(_lock_reg->as_register(), 0);
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  Runtime1::StubID enter_id;
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  if (ce->compilation()->has_fpu_code()) {
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    enter_id = Runtime1::monitorenter_id;
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  } else {
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    enter_id = Runtime1::monitorenter_nofpu_id;
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  }
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  __ call(RuntimeAddress(Runtime1::entry_for(enter_id)));
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  ce->add_call_info_here(_info);
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  ce->verify_oop_map(_info);
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  __ jmp(_continuation);
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}
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void MonitorExitStub::emit_code(LIR_Assembler* ce) {
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  __ bind(_entry);
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  if (_compute_lock) {
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    // lock_reg was destroyed by fast unlocking attempt => recompute it
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    ce->monitor_address(_monitor_ix, _lock_reg);
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  }
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  ce->store_parameter(_lock_reg->as_register(), 0);
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  // note: non-blocking leaf routine => no call info needed
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  Runtime1::StubID exit_id;
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  if (ce->compilation()->has_fpu_code()) {
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    exit_id = Runtime1::monitorexit_id;
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  } else {
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    exit_id = Runtime1::monitorexit_nofpu_id;
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  }
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  __ call(RuntimeAddress(Runtime1::entry_for(exit_id)));
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  __ jmp(_continuation);
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}
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// Implementation of patching:
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// - Copy the code at given offset to an inlined buffer (first the bytes, then the number of bytes)
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// - Replace original code with a call to the stub
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// At Runtime:
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// - call to stub, jump to runtime
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// - in runtime: preserve all registers (rspecially objects, i.e., source and destination object)
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// - in runtime: after initializing class, restore original code, reexecute instruction
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int PatchingStub::_patch_info_offset = -NativeGeneralJump::instruction_size;
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void PatchingStub::align_patch_site(MacroAssembler* masm) {
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  // We're patching a 5-7 byte instruction on intel and we need to
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  // make sure that we don't see a piece of the instruction.  It
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  // appears mostly impossible on Intel to simply invalidate other
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  // processors caches and since they may do aggressive prefetch it's
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  // very hard to make a guess about what code might be in the icache.
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  // Force the instruction to be double word aligned so that it
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  // doesn't span a cache line.
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  masm->align(round_to(NativeGeneralJump::instruction_size, wordSize));
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}
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void PatchingStub::emit_code(LIR_Assembler* ce) {
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  assert(NativeCall::instruction_size <= _bytes_to_copy && _bytes_to_copy <= 0xFF, "not enough room for call");
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  Label call_patch;
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  // static field accesses have special semantics while the class
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  // initializer is being run so we emit a test which can be used to
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  // check that this code is being executed by the initializing
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  // thread.
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  address being_initialized_entry = __ pc();
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  if (CommentedAssembly) {
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    __ block_comment(" patch template");
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  }
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  if (_id == load_klass_id) {
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    // produce a copy of the load klass instruction for use by the being initialized case
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    address start = __ pc();
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    jobject o = NULL;
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    __ movoop(_obj, o);
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#ifdef ASSERT
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    for (int i = 0; i < _bytes_to_copy; i++) {
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      address ptr = (address)(_pc_start + i);
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      int a_byte = (*ptr) & 0xFF;
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      assert(a_byte == *start++, "should be the same code");
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    }
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#endif
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  } else {
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    // make a copy the code which is going to be patched.
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    for ( int i = 0; i < _bytes_to_copy; i++) {
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      address ptr = (address)(_pc_start + i);
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      int a_byte = (*ptr) & 0xFF;
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      __ a_byte (a_byte);
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      *ptr = 0x90; // make the site look like a nop
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    }
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  }
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  address end_of_patch = __ pc();
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  int bytes_to_skip = 0;
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  if (_id == load_klass_id) {
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    int offset = __ offset();
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    if (CommentedAssembly) {
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      __ block_comment(" being_initialized check");
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    }
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    assert(_obj != noreg, "must be a valid register");
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    Register tmp = rax;
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    if (_obj == tmp) tmp = rbx;
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    __ push(tmp);
1
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    __ get_thread(tmp);
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    __ cmpptr(tmp, Address(_obj, instanceKlass::init_thread_offset_in_bytes() + sizeof(klassOopDesc)));
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    __ pop(tmp);
1
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    __ jcc(Assembler::notEqual, call_patch);
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    // access_field patches may execute the patched code before it's
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    // copied back into place so we need to jump back into the main
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    // code of the nmethod to continue execution.
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    __ jmp(_patch_site_continuation);
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    // make sure this extra code gets skipped
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    bytes_to_skip += __ offset() - offset;
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  }
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  if (CommentedAssembly) {
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    __ block_comment("patch data encoded as movl");
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  }
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  // Now emit the patch record telling the runtime how to find the
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  // pieces of the patch.  We only need 3 bytes but for readability of
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  // the disassembly we make the data look like a movl reg, imm32,
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  // which requires 5 bytes
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  int sizeof_patch_record = 5;
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  bytes_to_skip += sizeof_patch_record;
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  // emit the offsets needed to find the code to patch
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  int being_initialized_entry_offset = __ pc() - being_initialized_entry + sizeof_patch_record;
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  __ a_byte(0xB8);
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  __ a_byte(0);
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  __ a_byte(being_initialized_entry_offset);
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  __ a_byte(bytes_to_skip);
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  __ a_byte(_bytes_to_copy);
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  address patch_info_pc = __ pc();
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  assert(patch_info_pc - end_of_patch == bytes_to_skip, "incorrect patch info");
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  address entry = __ pc();
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  NativeGeneralJump::insert_unconditional((address)_pc_start, entry);
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  address target = NULL;
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  switch (_id) {
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    case access_field_id:  target = Runtime1::entry_for(Runtime1::access_field_patching_id); break;
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    case load_klass_id:    target = Runtime1::entry_for(Runtime1::load_klass_patching_id); break;
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    default: ShouldNotReachHere();
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  }
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  __ bind(call_patch);
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  if (CommentedAssembly) {
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    __ block_comment("patch entry point");
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  }
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  __ call(RuntimeAddress(target));
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  assert(_patch_info_offset == (patch_info_pc - __ pc()), "must not change");
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  ce->add_call_info_here(_info);
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  int jmp_off = __ offset();
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  __ jmp(_patch_site_entry);
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  // Add enough nops so deoptimization can overwrite the jmp above with a call
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  // and not destroy the world.
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   365
  for (int j = __ offset() ; j < jmp_off + 5 ; j++ ) {
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    __ nop();
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  }
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  if (_id == load_klass_id) {
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    CodeSection* cs = __ code_section();
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    RelocIterator iter(cs, (address)_pc_start, (address)(_pc_start + 1));
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    relocInfo::change_reloc_info_for_address(&iter, (address) _pc_start, relocInfo::oop_type, relocInfo::none);
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  }
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}
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void ImplicitNullCheckStub::emit_code(LIR_Assembler* ce) {
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  ce->compilation()->implicit_exception_table()->append(_offset, __ offset());
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  __ bind(_entry);
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  __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::throw_null_pointer_exception_id)));
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  ce->add_call_info_here(_info);
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  debug_only(__ should_not_reach_here());
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}
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   384
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void SimpleExceptionStub::emit_code(LIR_Assembler* ce) {
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   386
  assert(__ rsp_offset() == 0, "frame size should be fixed");
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   387
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   388
  __ bind(_entry);
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   389
  // pass the object on stack because all registers must be preserved
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   390
  if (_obj->is_cpu_register()) {
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    ce->store_parameter(_obj->as_register(), 0);
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  }
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  __ call(RuntimeAddress(Runtime1::entry_for(_stub)));
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  ce->add_call_info_here(_info);
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  debug_only(__ should_not_reach_here());
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}
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   398
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ArrayStoreExceptionStub::ArrayStoreExceptionStub(CodeEmitInfo* info):
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  _info(info) {
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}
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   403
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void ArrayStoreExceptionStub::emit_code(LIR_Assembler* ce) {
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  assert(__ rsp_offset() == 0, "frame size should be fixed");
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  __ bind(_entry);
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  __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::throw_array_store_exception_id)));
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  ce->add_call_info_here(_info);
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  debug_only(__ should_not_reach_here());
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}
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   412
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void ArrayCopyStub::emit_code(LIR_Assembler* ce) {
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  //---------------slow case: call to native-----------------
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  __ bind(_entry);
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  // Figure out where the args should go
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  // This should really convert the IntrinsicID to the methodOop and signature
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  // but I don't know how to do that.
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  //
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  VMRegPair args[5];
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  BasicType signature[5] = { T_OBJECT, T_INT, T_OBJECT, T_INT, T_INT};
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  SharedRuntime::java_calling_convention(signature, args, 5, true);
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   423
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  // push parameters
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  // (src, src_pos, dest, destPos, length)
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  Register r[5];
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  r[0] = src()->as_register();
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  r[1] = src_pos()->as_register();
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  r[2] = dst()->as_register();
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  r[3] = dst_pos()->as_register();
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  r[4] = length()->as_register();
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   432
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  // next registers will get stored on the stack
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  for (int i = 0; i < 5 ; i++ ) {
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   435
    VMReg r_1 = args[i].first();
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   436
    if (r_1->is_stack()) {
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      int st_off = r_1->reg2stack() * wordSize;
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      __ movptr (Address(rsp, st_off), r[i]);
1
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   439
    } else {
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   440
      assert(r[i] == args[i].first()->as_Register(), "Wrong register for arg ");
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    }
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  }
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   443
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  ce->align_call(lir_static_call);
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   445
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  ce->emit_static_call_stub();
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  AddressLiteral resolve(SharedRuntime::get_resolve_static_call_stub(),
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                         relocInfo::static_call_type);
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  __ call(resolve);
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  ce->add_call_info_here(info());
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   451
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#ifndef PRODUCT
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  __ incrementl(ExternalAddress((address)&Runtime1::_arraycopy_slowcase_cnt));
1
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#endif
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   455
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   456
  __ jmp(_continuation);
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}
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   458
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   459
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#undef __