JDK14/Java14源码在线阅读

/*
 * 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 "asm/macroAssembler.inline.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 "utilities/macros.hpp"
#include "vmreg_sparc.inline.hpp"

#define __ ce->masm()->

RangeCheckStub::RangeCheckStub(CodeEmitInfo* info, LIR_Opr index, LIR_Opr array)
  : _throw_index_out_of_bounds_exception(false), _index(index), _array(array) {
  assert(info != NULL, "must have info");
  _info = new CodeEmitInfo(info);
}

RangeCheckStub::RangeCheckStub(CodeEmitInfo* info, LIR_Opr index)
  : _throw_index_out_of_bounds_exception(true), _index(index), _array(NULL) {
  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);
    __ 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;
  }

  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 {
    __ mov(_array->as_pointer_register(), G5);
    __ 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);
  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 CounterOverflowStub::emit_code(LIR_Assembler* ce) {
  __ bind(_entry);
  __ set(_bci, G4);
  Metadata *m = _method->as_constant_ptr()->as_metadata();
  __ set_metadata_constant(m, G5);
  __ 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);

  __ 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) {
  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);
  __ 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 || _id == load_appendix_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;
    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");
  }
  __ 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();

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