/*

 * Copyright (c) 1999, 2018, 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_ppc.hpp"

#include "runtime/sharedRuntime.hpp"

#include "utilities/macros.hpp"

#include "vmreg_ppc.inline.hpp"

#define __ ce->masm()->

  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);

    // May be used by optimizations like LoopInvariantCodeMotion or RangeCheckEliminator.

    DEBUG_ONLY( __ untested("RangeCheckStub: predicate_failed_trap_id"); )

    //__ load_const_optimized(R0, a);

    __ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(a));

    __ mtctr(R0);

    __ bctrl();

    ce->add_call_info_here(_info);

    ce->verify_oop_map(_info);

    debug_only(__ illtrap());

    return;

  }

  address stub = _throw_index_out_of_bounds_exception ? Runtime1::entry_for(Runtime1::throw_index_exception_id)

                                                      : Runtime1::entry_for(Runtime1::throw_range_check_failed_id);

  //__ load_const_optimized(R0, stub);

  __ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(stub));

  __ mtctr(R0);

  if (_index->is_register()) {

    __ extsw(index, _index->as_register());

  } else {

    __ load_const_optimized(index, _index->as_jint());

  }

  __ bctrl();

  ce->add_call_info_here(_info);

  ce->verify_oop_map(_info);

  debug_only(__ illtrap());

}

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);

  //__ load_const_optimized(R0, a);

  __ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(a));

  __ mtctr(R0);

  __ bctrl();

  ce->add_call_info_here(_info);

  ce->verify_oop_map(_info);

  debug_only(__ illtrap());

}

void CounterOverflowStub::emit_code(LIR_Assembler* ce) {

  __ bind(_entry);

  // Parameter 1: bci

  __ load_const_optimized(R0, _bci);

  __ std(R0, -16, R1_SP);

  // Parameter 2: Method*

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

  AddressLiteral md = __ constant_metadata_address(m); // Notify OOP recorder (don't need the relocation).

  __ load_const_optimized(R0, md.value());

  __ std(R0, -8, R1_SP);

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

  //__ load_const_optimized(R0, a);

  __ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(a));

  __ mtctr(R0);

  __ bctrl();

  ce->add_call_info_here(_info);

  ce->verify_oop_map(_info);

  __ b(_continuation);

}

void DivByZeroStub::emit_code(LIR_Assembler* ce) {

  if (_offset != -1) {

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

  }

  __ bind(_entry);

  address stub = Runtime1::entry_for(Runtime1::throw_div0_exception_id);

  //__ load_const_optimized(R0, stub);

  __ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(stub));

  __ mtctr(R0);

  __ bctrl();

  ce->add_call_info_here(_info);

  ce->verify_oop_map(_info);

  debug_only(__ illtrap());

}

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);

  }

  if (ImplicitNullChecks || TrapBasedNullChecks) {

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

  }

  __ bind(_entry);

  //__ load_const_optimized(R0, a);

  __ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(a));

  __ mtctr(R0);

  __ bctrl();

  ce->add_call_info_here(_info);

  ce->verify_oop_map(_info);

  debug_only(__ illtrap());

}

// Implementation of SimpleExceptionStub

void SimpleExceptionStub::emit_code(LIR_Assembler* ce) {

  __ bind(_entry);

  address stub = Runtime1::entry_for(_stub);

  //__ load_const_optimized(R0, stub);

  __ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(stub));

  if (_obj->is_valid()) { __ mr_if_needed(/*tmp1 in do_CheckCast*/ R4_ARG2, _obj->as_register()); }

  __ mtctr(R0);

  __ bctrl();

  ce->add_call_info_here(_info);

  debug_only( __ illtrap(); )

}

// 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);

  address entry = Runtime1::entry_for(_stub_id);

  //__ load_const_optimized(R0, entry);

  __ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(entry));

  __ mtctr(R0);

  __ bctrl();

  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) {

  __ bind(_entry);

  address entry = Runtime1::entry_for(Runtime1::new_type_array_id);

  //__ load_const_optimized(R0, entry);

  __ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(entry));

  __ mr_if_needed(/*op->tmp1()->as_register()*/ R5_ARG3, _length->as_register()); // already sign-extended

  __ mtctr(R0);

  __ bctrl();

  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;

  _length = length;

  _result = result;

  _info = new CodeEmitInfo(info);

}

void NewObjectArrayStub::emit_code(LIR_Assembler* ce) {

  __ bind(_entry);

  address entry = Runtime1::entry_for(Runtime1::new_object_array_id);

  //__ load_const_optimized(R0, entry);

  __ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(entry));

  __ mr_if_needed(/*op->tmp1()->as_register()*/ R5_ARG3, _length->as_register()); // already sign-extended

  __ mtctr(R0);

  __ bctrl();

  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);

  address stub = Runtime1::entry_for(ce->compilation()->has_fpu_code() ? Runtime1::monitorenter_id : Runtime1::monitorenter_nofpu_id);

  //__ load_const_optimized(R0, stub);

  __ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(stub));

  __ mr_if_needed(/*scratch_opr()->as_register()*/ R4_ARG2, _obj_reg->as_register());

  assert(_lock_reg->as_register() == R5_ARG3, "");

  __ mtctr(R0);

  __ bctrl();

  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);

  }

  address stub = Runtime1::entry_for(ce->compilation()->has_fpu_code() ? Runtime1::monitorexit_id : Runtime1::monitorexit_nofpu_id);

  //__ load_const_optimized(R0, stub);

  __ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(stub));

  assert(_lock_reg->as_register() == R4_ARG2, "");

  __ mtctr(R0);

  __ bctrl();

  __ b(_continuation);

}

// 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 = -(5 * BytesPerInstWord);

void PatchingStub::align_patch_site(MacroAssembler* ) {

  // Patch sites on ppc are always properly aligned.

}

#ifdef ASSERT

inline void compare_with_patch_site(address template_start, address pc_start, int bytes_to_copy) {

  address start = template_start;

  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

void PatchingStub::emit_code(LIR_Assembler* ce) {

  // copy original code here

  assert(NativeGeneralJump::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.

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

    __ load_const(_obj, addrlit, R0);

    DEBUG_ONLY( compare_with_patch_site(__ code_section()->start() + being_initialized_entry, _pc_start, _bytes_to_copy); )

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

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

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

    __ load_const(_obj, addrlit, R0);

    DEBUG_ONLY( compare_with_patch_site(__ code_section()->start() + being_initialized_entry, _pc_start, _bytes_to_copy); )

  } 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();

    __ 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");

    __ mr(R0, _obj); // spill

    __ ld(_obj, java_lang_Class::klass_offset_in_bytes(), _obj);

    __ ld(_obj, in_bytes(InstanceKlass::init_thread_offset()), _obj);

    __ cmpd(CCR0, _obj, R16_thread);

    __ mr(_obj, R0); // restore

    __ bne(CCR0, 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.

    __ b(_patch_site_continuation);

    // 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;

    case load_appendix_id: target = Runtime1::entry_for(Runtime1::load_appendix_patching_id);

                           reloc_type = relocInfo::oop_type; break;

    default: ShouldNotReachHere();

  }

  __ bind(call_patch);

  __ block_comment("patch entry point");

  //__ load_const(R0, target); + mtctr + bctrl must have size -_patch_info_offset

  __ load_const32(R0, MacroAssembler::offset_to_global_toc(target));

  __ add(R0, R29_TOC, R0);

  __ mtctr(R0);

  __ bctrl();

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

  ce->add_call_info_here(_info);

  __ b(_patch_site_entry);

  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, (address) pc, reloc_type, relocInfo::none);

  }

}

void DeoptimizeStub::emit_code(LIR_Assembler* ce) {

  __ bind(_entry);

  address stub = Runtime1::entry_for(Runtime1::deoptimize_id);

  //__ load_const_optimized(R0, stub);

  __ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(stub));

  __ mtctr(R0);

  __ load_const_optimized(R0, _trap_request); // Pass trap request in R0.

  __ bctrl();

  ce->add_call_info_here(_info);

  debug_only(__ illtrap());

}

void ArrayCopyStub::emit_code(LIR_Assembler* ce) {

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

  __ bind(_entry);

  __ mr(R3_ARG1, src()->as_register());

  __ extsw(R4_ARG2, src_pos()->as_register());

  __ mr(R5_ARG3, dst()->as_register());

  __ extsw(R6_ARG4, dst_pos()->as_register());

  __ extsw(R7_ARG5, length()->as_register());

  ce->emit_static_call_stub();

  bool success = ce->emit_trampoline_stub_for_call(SharedRuntime::get_resolve_static_call_stub());

  if (!success) { return; }

  __ relocate(relocInfo::static_call_type);

  // Note: At this point we do not have the address of the trampoline

  // stub, and the entry point might be too far away for bl, so __ pc()

  // serves as dummy and the bl will be patched later.

  __ code()->set_insts_mark();

  __ bl(__ pc());

  ce->add_call_info_here(info());

  ce->verify_oop_map(info());

#ifndef PRODUCT

  const address counter = (address)&Runtime1::_arraycopy_slowcase_cnt;

  const Register tmp = R3, tmp2 = R4;

  int simm16_offs = __ load_const_optimized(tmp, counter, tmp2, true);

  __ lwz(tmp2, simm16_offs, tmp);

  __ addi(tmp2, tmp2, 1);

  __ stw(tmp2, simm16_offs, tmp);

#endif

  __ b(_continuation);

}

#undef __