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 /*

  * Copyright (c) 1999, 2011, 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"

 #ifndef SERIALGC

 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp"

 #endif

 #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, oop_Relocation::spec(_oop_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;

       __ a_byte (a_byte);

     }

   }

   address end_of_patch = __ pc();

   int bytes_to_skip = 0;

   if (_id == load_klass_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(_oop_index >= 0, "must have oop index");

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

     __ ld_ptr(G3, instanceKlass::init_thread_offset_in_bytes() + sizeof(klassOopDesc), 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

   __ a_byte(0);

   __ a_byte(being_initialized_entry_offset);

   __ a_byte(bytes_to_skip);

   __ a_byte(_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;

   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); 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) {

     CodeSection* cs = __ code_section();

     address pc = (address)_pc_start;

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

     relocInfo::change_reloc_info_for_address(&iter, (address) pc, relocInfo::oop_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, relocInfo::oop_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();

 }

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

 #ifndef SERIALGC

 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();

 }

 void G1UnsafeGetObjSATBBarrierStub::emit_code(LIR_Assembler* ce) {

   // At this point we know that offset == referent_offset.

   //

   // So we might have to emit:

   //   if (src == null) goto continuation.

   //

   // and we definitely have to emit:

   //   if (klass(src).reference_type == REF_NONE) goto continuation

   //   if (!marking_active) goto continuation

   //   if (pre_val == null) goto continuation

   //   call pre_barrier(pre_val)

   //   goto continuation

   //

   __ bind(_entry);

   assert(src()->is_register(), "sanity");

   Register src_reg = src()->as_register();

   if (gen_src_check()) {

     // The original src operand was not a constant.

     // Generate src == null?

     if (__ is_in_wdisp16_range(_continuation)) {

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

     } else {

       __ cmp(src_reg, G0);

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

     }

     __ delayed()->nop();

   }

   // Generate src->_klass->_reference_type() == REF_NONE)?

   assert(tmp()->is_register(), "sanity");

   Register tmp_reg = tmp()->as_register();

   __ load_klass(src_reg, tmp_reg);

   Address ref_type_adr(tmp_reg, instanceKlass::reference_type_offset_in_bytes() + sizeof(oopDesc));

   __ ld(ref_type_adr, tmp_reg);

   // _reference_type field is of type ReferenceType (enum)

   assert(REF_NONE == 0, "check this code");

   __ cmp_zero_and_br(Assembler::equal, tmp_reg, _continuation, /*annul*/false, Assembler::pt);

   __ delayed()->nop();

   // Is marking active?

   assert(thread()->is_register(), "precondition");

   Register thread_reg = thread()->as_pointer_register();

   Address in_progress(thread_reg, in_bytes(JavaThread::satb_mark_queue_offset() +

                                        PtrQueue::byte_offset_of_active()));

   if (in_bytes(PtrQueue::byte_width_of_active()) == 4) {

     __ ld(in_progress, tmp_reg);

   } else {

     assert(in_bytes(PtrQueue::byte_width_of_active()) == 1, "Assumption");

     __ ldsb(in_progress, tmp_reg);

   }

   __ cmp_zero_and_br(Assembler::equal, tmp_reg, _continuation, /*annul*/false, Assembler::pt);

   __ delayed()->nop();

   // val == null?

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

   Register val_reg = val()->as_register();

   if (__ is_in_wdisp16_range(_continuation)) {

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

   } else {

     __ cmp(val_reg, G0);

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

   }

   __ delayed()->nop();

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

   __ delayed()->mov(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();

 }

 #endif // SERIALGC

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

 #undef __