/*

 * Copyright (c) 2008, 2015, Oracle and/or its affiliates. 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 "asm/macroAssembler.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_arm.hpp"

#include "runtime/sharedRuntime.hpp"

#include "utilities/macros.hpp"

#include "vmreg_arm.inline.hpp"

#if INCLUDE_ALL_GCS

#include "gc/g1/g1SATBCardTableModRefBS.hpp"

#endif // INCLUDE_ALL_GCS

#define __ ce->masm()->

void CounterOverflowStub::emit_code(LIR_Assembler* ce) {

  __ bind(_entry);

  ce->store_parameter(_bci, 0);

  ce->store_parameter(_method->as_constant_ptr()->as_metadata(), 1);

  __ call(Runtime1::entry_for(Runtime1::counter_overflow_id), relocInfo::runtime_call_type);

  ce->add_call_info_here(_info);

  ce->verify_oop_map(_info);

  __ b(_continuation);

}

// TODO: ARM - is it possible to inline these stubs into the main code stream?

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)

{

  _info = info == NULL ? NULL : new CodeEmitInfo(info);

}

void RangeCheckStub::emit_code(LIR_Assembler* ce) {

  __ bind(_entry);

  if (_info->deoptimize_on_exception()) {

#ifdef AARCH64

    __ NOT_TESTED();

#endif

    __ call(Runtime1::entry_for(Runtime1::predicate_failed_trap_id), relocInfo::runtime_call_type);

    ce->add_call_info_here(_info);

    ce->verify_oop_map(_info);

    debug_only(__ should_not_reach_here());

    return;

  }

  // Pass the array index on stack because all registers must be preserved

  ce->verify_reserved_argument_area_size(1);

  if (_index->is_cpu_register()) {

    __ str_32(_index->as_register(), Address(SP));

  } else {

    __ mov_slow(Rtemp, _index->as_jint()); // Rtemp should be OK in C1

    __ str_32(Rtemp, Address(SP));

  }

  if (_throw_index_out_of_bounds_exception) {

#ifdef AARCH64

    __ NOT_TESTED();

#endif

    __ call(Runtime1::entry_for(Runtime1::throw_index_exception_id), relocInfo::runtime_call_type);

  } else {

    __ call(Runtime1::entry_for(Runtime1::throw_range_check_failed_id), relocInfo::runtime_call_type);

  }

  ce->add_call_info_here(_info);

  ce->verify_oop_map(_info);

  DEBUG_ONLY(STOP("RangeCheck");)

}

PredicateFailedStub::PredicateFailedStub(CodeEmitInfo* info) {

  _info = new CodeEmitInfo(info);

}

void PredicateFailedStub::emit_code(LIR_Assembler* ce) {

  __ bind(_entry);

  __ call(Runtime1::entry_for(Runtime1::predicate_failed_trap_id), relocInfo::runtime_call_type);

  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);

  __ call(Runtime1::entry_for(Runtime1::throw_div0_exception_id),

          relocInfo::runtime_call_type);

  ce->add_call_info_here(_info);

  DEBUG_ONLY(STOP("DivByZero");)

}

// 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(_result->as_register() == R0, "runtime call setup");

  assert(_klass_reg->as_register() == R1, "runtime call setup");

  __ bind(_entry);

  __ call(Runtime1::entry_for(_stub_id), relocInfo::runtime_call_type);

  ce->add_call_info_here(_info);

  ce->verify_oop_map(_info);

  __ b(_continuation);

}

// 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(_result->as_register() == R0, "runtime call setup");

  assert(_klass_reg->as_register() == R1, "runtime call setup");

  assert(_length->as_register() == R2, "runtime call setup");

  __ bind(_entry);

  __ call(Runtime1::entry_for(Runtime1::new_type_array_id), relocInfo::runtime_call_type);

  ce->add_call_info_here(_info);

  ce->verify_oop_map(_info);

  __ 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(_result->as_register() == R0, "runtime call setup");

  assert(_klass_reg->as_register() == R1, "runtime call setup");

  assert(_length->as_register() == R2, "runtime call setup");

  __ bind(_entry);

  __ call(Runtime1::entry_for(Runtime1::new_object_array_id), relocInfo::runtime_call_type);

  ce->add_call_info_here(_info);

  ce->verify_oop_map(_info);

  __ 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) {

  __ bind(_entry);

  const Register obj_reg = _obj_reg->as_pointer_register();

  const Register lock_reg = _lock_reg->as_pointer_register();

  ce->verify_reserved_argument_area_size(2);

#ifdef AARCH64

  __ stp(obj_reg, lock_reg, Address(SP));

#else

  if (obj_reg < lock_reg) {

    __ stmia(SP, RegisterSet(obj_reg) | RegisterSet(lock_reg));

  } else {

    __ str(obj_reg, Address(SP));

    __ str(lock_reg, Address(SP, BytesPerWord));

  }

#endif // AARCH64

  Runtime1::StubID enter_id = ce->compilation()->has_fpu_code() ?

                              Runtime1::monitorenter_id :

                              Runtime1::monitorenter_nofpu_id;

  __ call(Runtime1::entry_for(enter_id), relocInfo::runtime_call_type);

  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) {

    ce->monitor_address(_monitor_ix, _lock_reg);

  }

  const Register lock_reg = _lock_reg->as_pointer_register();

  ce->verify_reserved_argument_area_size(1);

  __ str(lock_reg, Address(SP));

  // Non-blocking leaf routine - no call info needed

  Runtime1::StubID exit_id = ce->compilation()->has_fpu_code() ?

                             Runtime1::monitorexit_id :

                             Runtime1::monitorexit_nofpu_id;

  __ call(Runtime1::entry_for(exit_id), relocInfo::runtime_call_type);

  __ b(_continuation);

}

// Call return is directly after patch word

int PatchingStub::_patch_info_offset = 0;

void PatchingStub::align_patch_site(MacroAssembler* masm) {

#if 0

  // TODO: investigate if we required to implement this

    ShouldNotReachHere();

#endif

}

void PatchingStub::emit_code(LIR_Assembler* ce) {

  const int patchable_instruction_offset = AARCH64_ONLY(NativeInstruction::instruction_size) NOT_AARCH64(0);

  assert(NativeCall::instruction_size <= _bytes_to_copy && _bytes_to_copy <= 0xFF,

         "not enough room for call");

  assert((_bytes_to_copy & 3) == 0, "must copy a multiple of four bytes");

  Label call_patch;

  bool is_load = (_id == load_klass_id) || (_id == load_mirror_id) || (_id == load_appendix_id);

#ifdef AARCH64

  assert(nativeInstruction_at(_pc_start)->is_nop(), "required for MT safe patching");

  // Same alignment of reg2mem code and PatchingStub code. Required to make copied bind_literal() code properly aligned.

  __ align(wordSize);

#endif // AARCH64

  if (is_load NOT_AARCH64(&& !VM_Version::supports_movw())) {

    address start = __ pc();

    // The following sequence duplicates code provided in MacroAssembler::patchable_mov_oop()

    // without creating relocation info entry.

#ifdef AARCH64

    // Extra nop for MT safe patching

    __ nop();

#endif // AARCH64

    assert((__ pc() - start) == patchable_instruction_offset, "should be");

#ifdef AARCH64

    __ ldr(_obj, __ pc());

#else

    __ ldr(_obj, Address(PC));

    // Extra nop to handle case of large offset of oop placeholder (see NativeMovConstReg::set_data).

    __ nop();

#endif // AARCH64

#ifdef ASSERT

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

      assert(((address)_pc_start)[i] == start[i], "should be the same code");

    }

#endif // ASSERT

  }

  address being_initialized_entry = __ pc();

  if (CommentedAssembly) {

    __ block_comment(" patch template");

  }

  if (is_load) {

    address start = __ pc();

    if (_id == load_mirror_id || _id == load_appendix_id) {

      __ patchable_mov_oop(_obj, (jobject)Universe::non_oop_word(), _index);

    } else {

      __ patchable_mov_metadata(_obj, (Metadata*)Universe::non_oop_word(), _index);

    }

#ifdef ASSERT

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

      assert(((address)_pc_start)[i] == start[i], "should be the same code");

    }

#endif // ASSERT

  } else {

    int* start = (int*)_pc_start;

    int* end = start + (_bytes_to_copy / BytesPerInt);

    while (start < end) {

      __ emit_int32(*start++);

    }

  }

  address end_of_patch = __ pc();

  int bytes_to_skip = 0;

  if (_id == load_mirror_id) {

    int offset = __ offset();

    if (CommentedAssembly) {

      __ block_comment(" being_initialized check");

    }

    assert(_obj != noreg, "must be a valid register");

    // Rtemp should be OK in C1

    __ ldr(Rtemp, Address(_obj, java_lang_Class::klass_offset_in_bytes()));

    __ ldr(Rtemp, Address(Rtemp, InstanceKlass::init_thread_offset()));

    __ cmp(Rtemp, Rthread);

    __ b(call_patch, ne);

    __ b(_patch_site_continuation);

    bytes_to_skip += __ offset() - offset;

  }

  if (CommentedAssembly) {

    __ block_comment("patch data - 3 high bytes of the word");

  }

  const int sizeof_patch_record = 4;

  bytes_to_skip += sizeof_patch_record;

  int being_initialized_entry_offset = __ pc() - being_initialized_entry + sizeof_patch_record;

  __ emit_int32(0xff | being_initialized_entry_offset << 8 | bytes_to_skip << 16 | _bytes_to_copy << 24);

  address patch_info_pc = __ pc();

  assert(patch_info_pc - end_of_patch == bytes_to_skip, "incorrect patch info");

  // runtime call will return here

  Label call_return;

  __ bind(call_return);

  ce->add_call_info_here(_info);

  assert(_patch_info_offset == (patch_info_pc - __ pc()), "must not change");

  __ b(_patch_site_entry);

  address entry = __ pc();

  NativeGeneralJump::insert_unconditional((address)_pc_start, entry);

  address target = NULL;

  relocInfo::relocType reloc_type = relocInfo::none;

  switch (_id) {

    case access_field_id:  target = Runtime1::entry_for(Runtime1::access_field_patching_id); break;

    case load_klass_id:    target = Runtime1::entry_for(Runtime1::load_klass_patching_id); reloc_type = relocInfo::metadata_type; break;

    case load_mirror_id:   target = Runtime1::entry_for(Runtime1::load_mirror_patching_id); reloc_type = relocInfo::oop_type; break;

    case load_appendix_id: target = Runtime1::entry_for(Runtime1::load_appendix_patching_id); reloc_type = relocInfo::oop_type; break;

    default: ShouldNotReachHere();

  }

  __ bind(call_patch);

  if (CommentedAssembly) {

    __ block_comment("patch entry point");

  }

  // arrange for call to return just after patch word

  __ adr(LR, call_return);

  __ jump(target, relocInfo::runtime_call_type, Rtemp);

  if (is_load) {

    CodeSection* cs = __ code_section();

    address pc = (address)_pc_start;

    RelocIterator iter(cs, pc, pc + 1);

    relocInfo::change_reloc_info_for_address(&iter, pc, reloc_type, relocInfo::none);

  }

}

void DeoptimizeStub::emit_code(LIR_Assembler* ce) {

  __ bind(_entry);

  __ mov_slow(Rtemp, _trap_request);

  ce->verify_reserved_argument_area_size(1);

  __ str(Rtemp, Address(SP));

  __ call(Runtime1::entry_for(Runtime1::deoptimize_id), relocInfo::runtime_call_type);

  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);

  __ call(a, relocInfo::runtime_call_type);

  ce->add_call_info_here(_info);

  ce->verify_oop_map(_info);

  DEBUG_ONLY(STOP("ImplicitNullCheck");)

}

void SimpleExceptionStub::emit_code(LIR_Assembler* ce) {

  __ bind(_entry);

  // Pass the object on stack because all registers must be preserved

  if (_obj->is_cpu_register()) {

    ce->verify_reserved_argument_area_size(1);

    __ str(_obj->as_pointer_register(), Address(SP));

  } else {

    assert(_obj->is_illegal(), "should be");

  }

  __ call(Runtime1::entry_for(_stub), relocInfo::runtime_call_type);

  ce->add_call_info_here(_info);

  DEBUG_ONLY(STOP("SimpleException");)

}

void ArrayCopyStub::emit_code(LIR_Assembler* ce) {

  __ bind(_entry);

  VMRegPair args[5];

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

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

  Register r[5];

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

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

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

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

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

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

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

    if (arg->is_stack()) {

      __ str(r[i], Address(SP, arg->reg2stack() * VMRegImpl::stack_slot_size));

    } else {

      assert(r[i] == arg->as_Register(), "Calling conventions must match");

    }

  }

  ce->emit_static_call_stub();

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

    return; // CodeCache is full

  }

  int ret_addr_offset = __ patchable_call(SharedRuntime::get_resolve_static_call_stub(), relocInfo::static_call_type);

  assert(ret_addr_offset == __ offset(), "embedded return address not allowed");

  ce->add_call_info_here(info());

  ce->verify_oop_map(info());

  __ 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->verify_reserved_argument_area_size(1);

  __ str(pre_val_reg, Address(SP));

  __ call(Runtime1::entry_for(Runtime1::g1_pre_barrier_slow_id), relocInfo::runtime_call_type);

  __ 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->verify_reserved_argument_area_size(1);

  __ str(addr()->as_pointer_register(), Address(SP));

  __ call(Runtime1::entry_for(Runtime1::g1_post_barrier_slow_id), relocInfo::runtime_call_type);

  __ b(_continuation);

}

#endif // INCLUDE_ALL_GCS

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

#undef __