/*

 * Copyright (c) 1999, 2012, 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 "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_sparc.hpp"

#include "runtime/sharedRuntime.hpp"

#include "vmreg_sparc.inline.hpp"

#include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp"

#define __ ce->masm()->

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 (_index->is_register()) {

    __ mov(_index->as_register(), G4);

  } else {

    __ set(_index->as_jint(), G4);

  }

  if (_throw_index_out_of_bounds_exception) {

    __ 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);

  }

  __ delayed()->nop();

  ce->add_call_info_here(_info);

  ce->verify_oop_map(_info);

#ifdef ASSERT

  __ should_not_reach_here();

#endif

}

void CounterOverflowStub::emit_code(LIR_Assembler* ce) {

  __ bind(_entry);

  __ set(_bci, G4);

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

  __ delayed()->mov_or_nop(_method->as_register(), G5);

  ce->add_call_info_here(_info);

  ce->verify_oop_map(_info);

  __ br(Assembler::always, true, Assembler::pt, _continuation);

  __ delayed()->nop();

}

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);

  __ delayed()->nop();

  ce->add_call_info_here(_info);

  ce->verify_oop_map(_info);

#ifdef ASSERT

  __ should_not_reach_here();

#endif

}

void ImplicitNullCheckStub::emit_code(LIR_Assembler* ce) {

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

  __ bind(_entry);

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

          relocInfo::runtime_call_type);

  __ delayed()->nop();

  ce->add_call_info_here(_info);

  ce->verify_oop_map(_info);

#ifdef ASSERT

  __ should_not_reach_here();

#endif

}

// Implementation of SimpleExceptionStub

// Note: %g1 and %g3 are already in use

void SimpleExceptionStub::emit_code(LIR_Assembler* ce) {

  __ bind(_entry);

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

  if (_obj->is_valid()) {

    __ delayed()->mov(_obj->as_register(), G4); // _obj contains the optional argument to the stub

  } else {

    __ delayed()->mov(G0, G4);

  }

  ce->add_call_info_here(_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) {

  __ bind(_entry);

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

  __ delayed()->mov_or_nop(_klass_reg->as_register(), G5);

  ce->add_call_info_here(_info);

  ce->verify_oop_map(_info);

  __ br(Assembler::always, false, Assembler::pt, _continuation);

  __ delayed()->mov_or_nop(O0, _result->as_register());

}

// 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) {

  __ bind(_entry);

  __ mov(_length->as_register(), G4);

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

  __ delayed()->mov_or_nop(_klass_reg->as_register(), G5);

  ce->add_call_info_here(_info);

  ce->verify_oop_map(_info);

  __ br(Assembler::always, false, Assembler::pt, _continuation);

  __ delayed()->mov_or_nop(O0, _result->as_register());

}

// Implementation of NewObjectArrayStub

NewObjectArrayStub::NewObjectArrayStub(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 NewObjectArrayStub::emit_code(LIR_Assembler* ce) {

  __ bind(_entry);

  __ mov(_length->as_register(), G4);

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

  __ delayed()->mov_or_nop(_klass_reg->as_register(), G5);

  ce->add_call_info_here(_info);

  ce->verify_oop_map(_info);

  __ br(Assembler::always, false, Assembler::pt, _continuation);

  __ delayed()->mov_or_nop(O0, _result->as_register());

}

// 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);

  __ mov(_obj_reg->as_register(), G4);

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

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

  } else {

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

  }

  __ delayed()->mov_or_nop(_lock_reg->as_register(), G5);

  ce->add_call_info_here(_info);

  ce->verify_oop_map(_info);

  __ br(Assembler::always, true, Assembler::pt, _continuation);

  __ delayed()->nop();

}

void MonitorExitStub::emit_code(LIR_Assembler* ce) {

  __ bind(_entry);

  if (_compute_lock) {

    ce->monitor_address(_monitor_ix, _lock_reg);

  }

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

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

  } else {

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

  }

  __ delayed()->mov_or_nop(_lock_reg->as_register(), G4);

  __ br(Assembler::always, true, Assembler::pt, _continuation);

  __ delayed()->nop();

}

// 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 (especially 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* ) {

  // patch sites on sparc are always properly aligned.

}

void PatchingStub::emit_code(LIR_Assembler* ce) {

  // copy original code here

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

         "not enough room for call");

  assert((_bytes_to_copy & 0x3) == 0, "must copy a multiple of four bytes");

  Label call_patch;

  int being_initialized_entry = __ offset();

  if (_id == load_klass_id) {

    // produce a copy of the load klass instruction for use by the being initialized case

#ifdef ASSERT

    address start = __ pc();

#endif

    AddressLiteral addrlit(NULL, metadata_Relocation::spec(_index));

    __ patchable_set(addrlit, _obj);

#ifdef ASSERT

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

      address ptr = (address)(_pc_start + i);

      int a_byte = (*ptr) & 0xFF;

      assert(a_byte == *start++, "should be the same code");

    }

#endif

  } else if (_id == load_mirror_id) {

    // produce a copy of the load mirror instruction for use by the being initialized case

#ifdef ASSERT

    address start = __ pc();

#endif

    AddressLiteral addrlit(NULL, oop_Relocation::spec(_index));

    __ patchable_set(addrlit, _obj);

#ifdef ASSERT

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

      address ptr = (address)(_pc_start + i);

      int a_byte = (*ptr) & 0xFF;

      assert(a_byte == *start++, "should be the same code");

    }

#endif

  } else {

    // make a copy the code which is going to be patched.

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

      address ptr = (address)(_pc_start + i);

      int a_byte = (*ptr) & 0xFF;

      __ emit_int8 (a_byte);

    }

  }

  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");

    }

    // static field accesses have special semantics while the class

    // initializer is being run so we emit a test which can be used to

    // check that this code is being executed by the initializing

    // thread.

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

    assert(_index >= 0, "must have oop index");

    __ ld_ptr(_obj, java_lang_Class::klass_offset_in_bytes(), G3);

    __ ld_ptr(G3, in_bytes(InstanceKlass::init_thread_offset()), G3);

    __ cmp_and_brx_short(G2_thread, G3, Assembler::notEqual, Assembler::pn, call_patch);

    // load_klass patches may execute the patched code before it's

    // copied back into place so we need to jump back into the main

    // code of the nmethod to continue execution.

    __ br(Assembler::always, false, Assembler::pt, _patch_site_continuation);

    __ delayed()->nop();

    // make sure this extra code gets skipped

    bytes_to_skip += __ offset() - offset;

  }

  // Now emit the patch record telling the runtime how to find the

  // pieces of the patch.  We only need 3 bytes but it has to be

  // aligned as an instruction so emit 4 bytes.

  int sizeof_patch_record = 4;

  bytes_to_skip += sizeof_patch_record;

  // emit the offsets needed to find the code to patch

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

  // Emit the patch record.  We need to emit a full word, so emit an extra empty byte

  __ emit_int8(0);

  __ emit_int8(being_initialized_entry_offset);

  __ emit_int8(bytes_to_skip);

  __ emit_int8(_bytes_to_copy);

  address patch_info_pc = __ pc();

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

  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;

    default: ShouldNotReachHere();

  }

  __ bind(call_patch);

  if (CommentedAssembly) {

    __ block_comment("patch entry point");

  }

  __ call(target, relocInfo::runtime_call_type);

  __ delayed()->nop();

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

  ce->add_call_info_here(_info);

  __ br(Assembler::always, false, Assembler::pt, _patch_site_entry);

  __ delayed()->nop();

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

    CodeSection* cs = __ code_section();

    address pc = (address)_pc_start;

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

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

    pc = (address)(_pc_start + NativeMovConstReg::add_offset);

    RelocIterator iter2(cs, pc, pc+1);

    relocInfo::change_reloc_info_for_address(&iter2, (address) pc, reloc_type, relocInfo::none);

  }

}

void DeoptimizeStub::emit_code(LIR_Assembler* ce) {

  __ bind(_entry);

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

  __ delayed()->nop();

  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);

  __ mov(src()->as_register(),     O0);

  __ mov(src_pos()->as_register(), O1);

  __ mov(dst()->as_register(),     O2);

  __ mov(dst_pos()->as_register(), O3);

  __ mov(length()->as_register(),  O4);

  ce->emit_static_call_stub();

  __ call(SharedRuntime::get_resolve_static_call_stub(), relocInfo::static_call_type);

  __ delayed()->nop();

  ce->add_call_info_here(info());

  ce->verify_oop_map(info());

#ifndef PRODUCT

  __ set((intptr_t)&Runtime1::_arraycopy_slowcase_cnt, O0);

  __ ld(O0, 0, O1);

  __ inc(O1);

  __ st(O1, 0, O0);

#endif

  __ br(Assembler::always, false, Assembler::pt, _continuation);

  __ delayed()->nop();

}

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

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*/);

  }

  if (__ is_in_wdisp16_range(_continuation)) {

    __ br_null(pre_val_reg, /*annul*/false, Assembler::pt, _continuation);

  } else {

    __ cmp(pre_val_reg, G0);

    __ brx(Assembler::equal, false, Assembler::pn, _continuation);

  }

  __ delayed()->nop();

  __ call(Runtime1::entry_for(Runtime1::Runtime1::g1_pre_barrier_slow_id));

  __ delayed()->mov(pre_val_reg, G4);

  __ br(Assembler::always, false, Assembler::pt, _continuation);

  __ delayed()->nop();

}

jbyte* G1PostBarrierStub::_byte_map_base = NULL;

jbyte* G1PostBarrierStub::byte_map_base_slow() {

  BarrierSet* bs = Universe::heap()->barrier_set();

  assert(bs->is_a(BarrierSet::G1SATBCTLogging),

         "Must be if we're using this.");

  return ((G1SATBCardTableModRefBS*)bs)->byte_map_base;

}

void G1PostBarrierStub::emit_code(LIR_Assembler* ce) {

  __ bind(_entry);

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

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

  Register addr_reg = addr()->as_pointer_register();

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

  if (__ is_in_wdisp16_range(_continuation)) {

    __ br_null(new_val_reg, /*annul*/false, Assembler::pt, _continuation);

  } else {

    __ cmp(new_val_reg, G0);

    __ brx(Assembler::equal, false, Assembler::pn, _continuation);

  }

  __ delayed()->nop();

  __ call(Runtime1::entry_for(Runtime1::Runtime1::g1_post_barrier_slow_id));

  __ delayed()->mov(addr_reg, G4);

  __ br(Assembler::always, false, Assembler::pt, _continuation);

  __ delayed()->nop();

}

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

#undef __