/*

 * Copyright (c) 1999, 2015, Oracle and/or its affiliates. All rights reserved.

 * Copyright (c) 2014, Red Hat Inc. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

#include "precompiled.hpp"

#include "c1/c1_CodeStubs.hpp"

#include "c1/c1_FrameMap.hpp"

#include "c1/c1_LIRAssembler.hpp"

#include "c1/c1_MacroAssembler.hpp"

#include "c1/c1_Runtime1.hpp"

#include "nativeInst_aarch64.hpp"

#include "runtime/sharedRuntime.hpp"

#include "vmreg_aarch64.inline.hpp"

#if INCLUDE_ALL_GCS

#include "gc/g1/g1SATBCardTableModRefBS.hpp"

#endif

#define __ ce->masm()->

void CounterOverflowStub::emit_code(LIR_Assembler* ce) {

  __ bind(_entry);

  Metadata *m = _method->as_constant_ptr()->as_metadata();

  __ mov_metadata(rscratch1, m);

  ce->store_parameter(rscratch1, 1);

  ce->store_parameter(_bci, 0);

  __ far_call(RuntimeAddress(Runtime1::entry_for(Runtime1::counter_overflow_id)));

  ce->add_call_info_here(_info);

  ce->verify_oop_map(_info);

  __ b(_continuation);

}

RangeCheckStub::RangeCheckStub(CodeEmitInfo* info, LIR_Opr index,

                               bool throw_index_out_of_bounds_exception)

  : _throw_index_out_of_bounds_exception(throw_index_out_of_bounds_exception)

  , _index(index)

{

  assert(info != NULL, "must have info");

  _info = new CodeEmitInfo(info);

}

void RangeCheckStub::emit_code(LIR_Assembler* ce) {

  __ bind(_entry);

  if (_info->deoptimize_on_exception()) {

    address a = Runtime1::entry_for(Runtime1::predicate_failed_trap_id);

    __ far_call(RuntimeAddress(a));

    ce->add_call_info_here(_info);

    ce->verify_oop_map(_info);

    debug_only(__ should_not_reach_here());

    return;

  }

  if (_index->is_cpu_register()) {

    __ mov(rscratch1, _index->as_register());

  } else {

    __ mov(rscratch1, _index->as_jint());

  }

  Runtime1::StubID stub_id;

  if (_throw_index_out_of_bounds_exception) {

    stub_id = Runtime1::throw_index_exception_id;

  } else {

    stub_id = Runtime1::throw_range_check_failed_id;

  }

  __ far_call(RuntimeAddress(Runtime1::entry_for(stub_id)), NULL, rscratch2);

  ce->add_call_info_here(_info);

  ce->verify_oop_map(_info);

  debug_only(__ should_not_reach_here());

}

PredicateFailedStub::PredicateFailedStub(CodeEmitInfo* info) {

  _info = new CodeEmitInfo(info);

}

void PredicateFailedStub::emit_code(LIR_Assembler* ce) {

  __ bind(_entry);

  address a = Runtime1::entry_for(Runtime1::predicate_failed_trap_id);

  __ far_call(RuntimeAddress(a));

  ce->add_call_info_here(_info);

  ce->verify_oop_map(_info);

  debug_only(__ should_not_reach_here());

}

void DivByZeroStub::emit_code(LIR_Assembler* ce) {

  if (_offset != -1) {

    ce->compilation()->implicit_exception_table()->append(_offset, __ offset());

  }

  __ bind(_entry);

  __ far_call(Address(Runtime1::entry_for(Runtime1::throw_div0_exception_id), relocInfo::runtime_call_type));

  ce->add_call_info_here(_info);

  ce->verify_oop_map(_info);

#ifdef ASSERT

  __ should_not_reach_here();

#endif

}

// Implementation of NewInstanceStub

NewInstanceStub::NewInstanceStub(LIR_Opr klass_reg, LIR_Opr result, ciInstanceKlass* klass, CodeEmitInfo* info, Runtime1::StubID stub_id) {

  _result = result;

  _klass = klass;

  _klass_reg = klass_reg;

  _info = new CodeEmitInfo(info);

  assert(stub_id == Runtime1::new_instance_id                 ||

         stub_id == Runtime1::fast_new_instance_id            ||

         stub_id == Runtime1::fast_new_instance_init_check_id,

         "need new_instance id");

  _stub_id   = stub_id;

}

void NewInstanceStub::emit_code(LIR_Assembler* ce) {

  assert(__ rsp_offset() == 0, "frame size should be fixed");

  __ bind(_entry);

  __ mov(r3, _klass_reg->as_register());

  __ far_call(RuntimeAddress(Runtime1::entry_for(_stub_id)));

  ce->add_call_info_here(_info);

  ce->verify_oop_map(_info);

  assert(_result->as_register() == r0, "result must in r0,");

  __ b(_continuation);

}

// Implementation of NewTypeArrayStub

// Implementation of NewTypeArrayStub

NewTypeArrayStub::NewTypeArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info) {

  _klass_reg = klass_reg;

  _length = length;

  _result = result;

  _info = new CodeEmitInfo(info);

}

void NewTypeArrayStub::emit_code(LIR_Assembler* ce) {

  assert(__ rsp_offset() == 0, "frame size should be fixed");

  __ bind(_entry);

  assert(_length->as_register() == r19, "length must in r19,");

  assert(_klass_reg->as_register() == r3, "klass_reg must in r3");

  __ far_call(RuntimeAddress(Runtime1::entry_for(Runtime1::new_type_array_id)));

  ce->add_call_info_here(_info);

  ce->verify_oop_map(_info);

  assert(_result->as_register() == r0, "result must in r0");

  __ b(_continuation);

}

// Implementation of NewObjectArrayStub

NewObjectArrayStub::NewObjectArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info) {

  _klass_reg = klass_reg;

  _result = result;

  _length = length;

  _info = new CodeEmitInfo(info);

}

void NewObjectArrayStub::emit_code(LIR_Assembler* ce) {

  assert(__ rsp_offset() == 0, "frame size should be fixed");

  __ bind(_entry);

  assert(_length->as_register() == r19, "length must in r19,");

  assert(_klass_reg->as_register() == r3, "klass_reg must in r3");

  __ far_call(RuntimeAddress(Runtime1::entry_for(Runtime1::new_object_array_id)));

  ce->add_call_info_here(_info);

  ce->verify_oop_map(_info);

  assert(_result->as_register() == r0, "result must in r0");

  __ b(_continuation);

}

// Implementation of MonitorAccessStubs

MonitorEnterStub::MonitorEnterStub(LIR_Opr obj_reg, LIR_Opr lock_reg, CodeEmitInfo* info)

: MonitorAccessStub(obj_reg, lock_reg)

{

  _info = new CodeEmitInfo(info);

}

void MonitorEnterStub::emit_code(LIR_Assembler* ce) {

  assert(__ rsp_offset() == 0, "frame size should be fixed");

  __ bind(_entry);

  ce->store_parameter(_obj_reg->as_register(),  1);

  ce->store_parameter(_lock_reg->as_register(), 0);

  Runtime1::StubID enter_id;

  if (ce->compilation()->has_fpu_code()) {

    enter_id = Runtime1::monitorenter_id;

  } else {

    enter_id = Runtime1::monitorenter_nofpu_id;

  }

  __ far_call(RuntimeAddress(Runtime1::entry_for(enter_id)));

  ce->add_call_info_here(_info);

  ce->verify_oop_map(_info);

  __ b(_continuation);

}

void MonitorExitStub::emit_code(LIR_Assembler* ce) {

  __ bind(_entry);

  if (_compute_lock) {

    // lock_reg was destroyed by fast unlocking attempt => recompute it

    ce->monitor_address(_monitor_ix, _lock_reg);

  }

  ce->store_parameter(_lock_reg->as_register(), 0);

  // note: non-blocking leaf routine => no call info needed

  Runtime1::StubID exit_id;

  if (ce->compilation()->has_fpu_code()) {

    exit_id = Runtime1::monitorexit_id;

  } else {

    exit_id = Runtime1::monitorexit_nofpu_id;

  }

  __ adr(lr, _continuation);

  __ far_jump(RuntimeAddress(Runtime1::entry_for(exit_id)));

}

// Implementation of patching:

// - Copy the code at given offset to an inlined buffer (first the bytes, then the number of bytes)

// - Replace original code with a call to the stub

// At Runtime:

// - call to stub, jump to runtime

// - in runtime: preserve all registers (rspecially objects, i.e., source and destination object)

// - in runtime: after initializing class, restore original code, reexecute instruction

int PatchingStub::_patch_info_offset = -NativeGeneralJump::instruction_size;

void PatchingStub::align_patch_site(MacroAssembler* masm) {

}

void PatchingStub::emit_code(LIR_Assembler* ce) {

  assert(false, "AArch64 should not use C1 runtime patching");

}

void DeoptimizeStub::emit_code(LIR_Assembler* ce) {

  __ bind(_entry);

  ce->store_parameter(_trap_request, 0);

  __ far_call(RuntimeAddress(Runtime1::entry_for(Runtime1::deoptimize_id)));

  ce->add_call_info_here(_info);

  DEBUG_ONLY(__ should_not_reach_here());

}

void ImplicitNullCheckStub::emit_code(LIR_Assembler* ce) {

  address a;

  if (_info->deoptimize_on_exception()) {

    // Deoptimize, do not throw the exception, because it is probably wrong to do it here.

    a = Runtime1::entry_for(Runtime1::predicate_failed_trap_id);

  } else {

    a = Runtime1::entry_for(Runtime1::throw_null_pointer_exception_id);

  }

  ce->compilation()->implicit_exception_table()->append(_offset, __ offset());

  __ bind(_entry);

  __ far_call(RuntimeAddress(a));

  ce->add_call_info_here(_info);

  ce->verify_oop_map(_info);

  debug_only(__ should_not_reach_here());

}

void SimpleExceptionStub::emit_code(LIR_Assembler* ce) {

  assert(__ rsp_offset() == 0, "frame size should be fixed");

  __ bind(_entry);

  // pass the object in a scratch register because all other registers

  // must be preserved

  if (_obj->is_cpu_register()) {

    __ mov(rscratch1, _obj->as_register());

  }

  __ far_call(RuntimeAddress(Runtime1::entry_for(_stub)), NULL, rscratch2);

  ce->add_call_info_here(_info);

  debug_only(__ should_not_reach_here());

}

void ArrayCopyStub::emit_code(LIR_Assembler* ce) {

  //---------------slow case: call to native-----------------

  __ bind(_entry);

  // Figure out where the args should go

  // This should really convert the IntrinsicID to the Method* and signature

  // but I don't know how to do that.

  //

  VMRegPair args[5];

  BasicType signature[5] = { T_OBJECT, T_INT, T_OBJECT, T_INT, T_INT};

  SharedRuntime::java_calling_convention(signature, args, 5, true);

  // push parameters

  // (src, src_pos, dest, destPos, length)

  Register r[5];

  r[0] = src()->as_register();

  r[1] = src_pos()->as_register();

  r[2] = dst()->as_register();

  r[3] = dst_pos()->as_register();

  r[4] = length()->as_register();

  // next registers will get stored on the stack

  for (int i = 0; i < 5 ; i++ ) {

    VMReg r_1 = args[i].first();

    if (r_1->is_stack()) {

      int st_off = r_1->reg2stack() * wordSize;

      __ str (r[i], Address(sp, st_off));

    } else {

      assert(r[i] == args[i].first()->as_Register(), "Wrong register for arg ");

    }

  }

  ce->align_call(lir_static_call);

  ce->emit_static_call_stub();

  if (ce->compilation()->bailed_out()) {

    return; // CodeCache is full

  }

  Address resolve(SharedRuntime::get_resolve_static_call_stub(),

                  relocInfo::static_call_type);

  address call = __ trampoline_call(resolve);

  if (call == NULL) {

    ce->bailout("trampoline stub overflow");

    return;

  }

  ce->add_call_info_here(info());

#ifndef PRODUCT

  __ lea(rscratch2, ExternalAddress((address)&Runtime1::_arraycopy_slowcase_cnt));

  __ incrementw(Address(rscratch2));

#endif

  __ b(_continuation);

}

/////////////////////////////////////////////////////////////////////////////

#if INCLUDE_ALL_GCS

void G1PreBarrierStub::emit_code(LIR_Assembler* ce) {

  // At this point we know that marking is in progress.

  // If do_load() is true then we have to emit the

  // load of the previous value; otherwise it has already

  // been loaded into _pre_val.

  __ bind(_entry);

  assert(pre_val()->is_register(), "Precondition.");

  Register pre_val_reg = pre_val()->as_register();

  if (do_load()) {

    ce->mem2reg(addr(), pre_val(), T_OBJECT, patch_code(), info(), false /*wide*/, false /*unaligned*/);

  }

  __ cbz(pre_val_reg, _continuation);

  ce->store_parameter(pre_val()->as_register(), 0);

  __ far_call(RuntimeAddress(Runtime1::entry_for(Runtime1::g1_pre_barrier_slow_id)));

  __ b(_continuation);

}

void G1PostBarrierStub::emit_code(LIR_Assembler* ce) {

  __ bind(_entry);

  assert(addr()->is_register(), "Precondition.");

  assert(new_val()->is_register(), "Precondition.");

  Register new_val_reg = new_val()->as_register();

  __ cbz(new_val_reg, _continuation);

  ce->store_parameter(addr()->as_pointer_register(), 0);

  __ far_call(RuntimeAddress(Runtime1::entry_for(Runtime1::g1_post_barrier_slow_id)));

  __ b(_continuation);

}

#endif // INCLUDE_ALL_GCS

/////////////////////////////////////////////////////////////////////////////

#undef __