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 /*

  * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.

  * Copyright (c) 2015, 2018, Loongson Technology. 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_mips.hpp"

 #include "runtime/sharedRuntime.hpp"

 #include "utilities/macros.hpp"

 #include "vmreg_mips.inline.hpp"

 #if INCLUDE_ALL_GCS

 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp"

 #endif

 #define __ ce->masm()->

 float ConversionStub::float_zero = 0.0;

 double ConversionStub::double_zero = 0.0;

 void ConversionStub::emit_code(LIR_Assembler* ce) {

   __ bind(_entry);

   assert(bytecode() == Bytecodes::_f2i || bytecode() == Bytecodes::_d2i, "other conversions do not require stub");

 }

 #ifdef TIERED

 void CounterOverflowStub::emit_code(LIR_Assembler* ce) {

   __ bind(_entry);

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

   ce->store_parameter(_bci, 0);

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

   __ delayed()->nop();

   ce->add_call_info_here(_info);

   ce->verify_oop_map(_info);

   __ b_far(_continuation);

   __ delayed()->nop();

 }

 #endif // TIERED

 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()) {

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

     __ call(a, relocInfo::runtime_call_type);

     __ delayed()->nop();

     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

   if (_index->is_cpu_register()) {

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

   } else {

     ce->store_parameter(_index->as_jint(), 0);

   }

   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;

   }

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

   __ delayed()->nop();

   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);

   __ call(a, relocInfo::runtime_call_type);

   __ delayed()->nop();

   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);

   __ delayed()->nop();

   ce->add_call_info_here(_info);

   debug_only(__ should_not_reach_here());

 }

 // 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;

 }

 // i use T4 as klass register, V0 as result register. MUST accord with Runtime1::generate_code_for.

 void NewInstanceStub::emit_code(LIR_Assembler* ce) {

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

   __ bind(_entry);

 #ifndef _LP64

   assert(_klass_reg->as_register() == T4, "klass_reg must in T4");

 #else

   assert(_klass_reg->as_register() == A4, "klass_reg must in A4");

 #endif

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

   __ delayed()->nop();

   ce->add_call_info_here(_info);

   ce->verify_oop_map(_info);

   assert(_result->as_register() == V0, "result must in V0,");

   __ b_far(_continuation);

   __ delayed()->nop();

 }

 // 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);

 }

 // i use T2 as length register, T4 as klass register, V0 as result register.

 // MUST accord with Runtime1::generate_code_for

 void NewTypeArrayStub::emit_code(LIR_Assembler* ce) {

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

   __ bind(_entry);

   assert(_length->as_register() == T2, "length must in T2,");

 #ifndef _LP64

   assert(_klass_reg->as_register() == T4, "klass_reg must in T4");

 #else

   assert(_klass_reg->as_register() == A4, "klass_reg must in A4");

 #endif

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

   __ delayed()->nop();

   ce->add_call_info_here(_info);

   ce->verify_oop_map(_info);

   assert(_result->as_register() == V0, "result must in V0,");

   __ b_far(_continuation);

   __ delayed()->nop();

 }

 // 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(__ sp_offset() == 0, "frame size should be fixed");

   __ bind(_entry);

   assert(_length->as_register() == T2, "length must in T2");

 #ifndef _LP64

   assert(_klass_reg->as_register() == T4, "klass_reg must in T4");

 #else

   assert(_klass_reg->as_register() == A4, "klass_reg must in A4");

 #endif

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

   __ delayed()->nop();

   ce->add_call_info_here(_info);

   ce->verify_oop_map(_info);

   assert(_result->as_register() == V0, "result must in V0");

   __ b_far(_continuation);

   __ delayed()->nop();

 }

 // 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(__ sp_offset() == 0, "frame size should be fixed");

   __ bind(_entry);

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

   ce->store_parameter(_lock_reg->is_single_cpu()? _lock_reg->as_register() : _lock_reg->as_register_lo(), 0);

   Runtime1::StubID enter_id;

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

     enter_id = Runtime1::monitorenter_id;

   } else {

     enter_id = Runtime1::monitorenter_nofpu_id;

   }

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

   __ delayed()->nop();

   ce->add_call_info_here(_info);

   ce->verify_oop_map(_info);

   __ b_far(_continuation);

   __ delayed()->nop();

 }

 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;

   }

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

   __ delayed()->nop();

   __ b_far(_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;

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

 void PatchingStub::align_patch_site(MacroAssembler* masm) {

   masm->align(round_to(NativeGeneralJump::instruction_size, wordSize));

 }

 void PatchingStub::emit_code(LIR_Assembler* ce) {

   assert(NativeCall::instruction_size <= _bytes_to_copy && _bytes_to_copy <= 0xFF, "not enough room for call");

   assert(_bytes_to_copy <= 0xFF, "not enough room for call");

   Label call_patch;

   // 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.

   address being_initialized_entry = __ pc();

   if (CommentedAssembly) {

     __ block_comment(" patch template");

   }

   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

     Metadata* o = NULL;

     RelocationHolder rspec = metadata_Relocation::spec(_index);

     __ relocate(rspec);

     __ li48(_obj, (long)o);

     while ((intx)__ pc() - (intx)start < NativeCall::instruction_size) {

       __ nop();

     }

 #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 || _id == load_appendix_id) {

 //#ifdef ASSERT

     address start = __ pc();

 //#endif

     jobject o = NULL;

     RelocationHolder rspec = oop_Relocation::spec(_index);

     __ relocate(rspec);

     __ li48(_obj, (long)o);

     while ((intx)__ pc() - (intx)start < NativeCall::instruction_size) {

       __ nop();

     }

 #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.

     assert((_bytes_to_copy&3)==0, "change this code");

     address start = __ pc();

     for ( int i = 0; i < _bytes_to_copy; i+=4) {

       __ emit_int32(*(int*)(_pc_start + i));

       //make the site look like a nop

       *(int*)(_pc_start + i)=0;

     }

     while ((intx)__ pc() - (intx)start < NativeCall::instruction_size) {

       __ nop();

     }

   }

   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");

 #ifndef OPT_THREAD

     Register tmp = AT;

     __ get_thread(tmp);

 #else

     Register tmp = TREG;

 #endif

     Register tmp2 = T9;

     __ ld_ptr(tmp2, Address(_obj, java_lang_Class::klass_offset_in_bytes()));

     __ ld_ptr(tmp2, Address(tmp2, InstanceKlass::init_thread_offset()));

     __ bne(tmp, tmp2, call_patch);

     __ delayed()->nop();

     // access_field 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.

     __ b_far(_patch_site_continuation);

     __ delayed()->nop();

     bytes_to_skip += __ offset() - offset;

   }

   if (CommentedAssembly) {

     __ block_comment("patch data");

   }

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

   // pieces of the patch.  We only need 3 bytes but for alignment, we

   // need 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 = __ pc() - being_initialized_entry + sizeof_patch_record;

   // patch_info_pc offset | size of b instruction(8)| patched code size

   assert(being_initialized_entry_offset % 4 == 0, "must be divided by four");

   assert(bytes_to_skip % 4 == 0, "must be divided by four");

   // Fix out of range of char. refer to load_klass_or_mirror_patch_id.

   being_initialized_entry_offset >>= 2;

   bytes_to_skip >>= 2;

   assert((char)being_initialized_entry_offset == being_initialized_entry_offset, "just check");

   assert((char)bytes_to_skip == bytes_to_skip, "just check");

   assert((char)_bytes_to_copy == _bytes_to_copy, "just check");

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

   address patch_info_pc = __ pc();

   // FIXME: byte_skip can not be contained in a byte

   bytes_to_skip <<= 2;

   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;

     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");

   }

   __ relocate(relocInfo::runtime_call_type);

   __ li48(T9, (long)target);

   __ jalr(T9);

   __ delayed()->nop();

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

   ce->add_call_info_here(_info);

   int jmp_off = __ offset();

   __ b_far(_patch_site_entry);

   __ delayed()->nop();

   // Add enough nops so deoptimization can overwrite the jmp above with a call

   // and not destroy the world.

   for (int j = __ offset(); j < jmp_off + NativeCall::instruction_size; j += 4 ) {

     __ nop();

   }

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

     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);

   __ 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 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);

   debug_only(__ should_not_reach_here());

 }

 // i dont know which register to use here, i just assume A1 here. FIXME

 void SimpleExceptionStub::emit_code(LIR_Assembler* ce) {

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

   __ bind(_entry);

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

   if (_obj->is_cpu_register()) {

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

   }

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

   // Figure out where the args should go

   // This should really convert the IntrinsicID to the methodOop 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;

       __ sw( r[i],  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();

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

   __ delayed()->nop();

   ce->add_call_info_here(info());

 #ifndef PRODUCT

 #ifndef _LP64

   __ lui(T8, Assembler::split_high((int)&Runtime1::_arraycopy_slowcase_cnt));

   __ lw(AT, T8, Assembler::split_low((int)&Runtime1::_arraycopy_slowcase_cnt));

   __ addiu(AT, AT, 1);

   __ sw(AT, T8, Assembler::split_low((int)&Runtime1::_arraycopy_slowcase_cnt));

 #else

   __ li(T8, (long)&Runtime1::_arraycopy_slowcase_cnt);

   __ lw(AT, T8, 0);

   __ daddiu(AT, AT, 1);

   __ sw(AT, T8, 0);

 #endif

 #endif

   __ b_far(_continuation);

   __ delayed()->nop();

 }

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

 #if INCLUDE_ALL_GCS

 void G1PreBarrierStub::emit_code(LIR_Assembler* ce) {

   Unimplemented();

 }

 void G1PostBarrierStub::emit_code(LIR_Assembler* ce) {

   Unimplemented();

 }

 #endif // INCLUDE_ALL_GCS

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

 #undef __