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Java example source code file (stubRoutines.hpp)

This example Java source code file (stubRoutines.hpp) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

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Java - Java tags/keywords

basictype, bufferblob, callstub, cast_to_fn_ptr, codeblob, heapword, method, null, safefetch32stub, safefetchnstub, share_vm_runtime_stubroutines_hpp, target_arch_model_sparc, target_arch_model_x86_32, target_arch_model_x86_64

The stubRoutines.hpp Java example source code

/*
 * Copyright (c) 1997, 2013, 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.
 *
 */

#ifndef SHARE_VM_RUNTIME_STUBROUTINES_HPP
#define SHARE_VM_RUNTIME_STUBROUTINES_HPP

#include "code/codeBlob.hpp"
#include "memory/allocation.hpp"
#include "runtime/frame.hpp"
#include "runtime/mutexLocker.hpp"
#include "runtime/stubCodeGenerator.hpp"
#include "utilities/top.hpp"
#ifdef TARGET_ARCH_x86
# include "nativeInst_x86.hpp"
#endif
#ifdef TARGET_ARCH_sparc
# include "nativeInst_sparc.hpp"
#endif
#ifdef TARGET_ARCH_zero
# include "nativeInst_zero.hpp"
#endif
#ifdef TARGET_ARCH_arm
# include "nativeInst_arm.hpp"
#endif
#ifdef TARGET_ARCH_ppc
# include "nativeInst_ppc.hpp"
#endif

// StubRoutines provides entry points to assembly routines used by
// compiled code and the run-time system. Platform-specific entry
// points are defined in the platform-specific inner class.
//
// Class scheme:
//
//    platform-independent               platform-dependent
//
//    stubRoutines.hpp  <-- included --  stubRoutines_.cpp
//    stubRoutines_<os_arch>.cpp
//
// Note 1: The important thing is a clean decoupling between stub
//         entry points (interfacing to the whole vm; i.e., 1-to-n
//         relationship) and stub generators (interfacing only to
//         the entry points implementation; i.e., 1-to-1 relationship).
//         This significantly simplifies changes in the generator
//         structure since the rest of the vm is not affected.
//
// Note 2: stubGenerator_<arch>.cpp contains a minimal portion of
//         machine-independent code; namely the generator calls of
//         the generator functions that are used platform-independently.
//         However, it comes with the advantage of having a 1-file
//         implementation of the generator. It should be fairly easy
//         to change, should it become a problem later.
//
// Scheme for adding a new entry point:
//
// 1. determine if it's a platform-dependent or independent entry point
//    a) if platform independent: make subsequent changes in the independent files
//    b) if platform   dependent: make subsequent changes in the   dependent files
// 2. add a private instance variable holding the entry point address
// 3. add a public accessor function to the instance variable
// 4. implement the corresponding generator function in the platform-dependent
//    stubGenerator_<arch>.cpp file and call the function in generate_all() of that file


class StubRoutines: AllStatic {

 public:
  enum platform_independent_constants {
    max_size_of_parameters = 256                           // max. parameter size supported by megamorphic lookups
  };

  // Dependencies
  friend class StubGenerator;
#ifdef TARGET_ARCH_MODEL_x86_32
# include "stubRoutines_x86_32.hpp"
#endif
#ifdef TARGET_ARCH_MODEL_x86_64
# include "stubRoutines_x86_64.hpp"
#endif
#ifdef TARGET_ARCH_MODEL_sparc
# include "stubRoutines_sparc.hpp"
#endif
#ifdef TARGET_ARCH_MODEL_zero
# include "stubRoutines_zero.hpp"
#endif
#ifdef TARGET_ARCH_MODEL_arm
# include "stubRoutines_arm.hpp"
#endif
#ifdef TARGET_ARCH_MODEL_ppc
# include "stubRoutines_ppc.hpp"
#endif


  static jint    _verify_oop_count;
  static address _verify_oop_subroutine_entry;

  static address _call_stub_return_address;                // the return PC, when returning to a call stub
  static address _call_stub_entry;
  static address _forward_exception_entry;
  static address _catch_exception_entry;
  static address _throw_AbstractMethodError_entry;
  static address _throw_IncompatibleClassChangeError_entry;
  static address _throw_NullPointerException_at_call_entry;
  static address _throw_StackOverflowError_entry;
  static address _handler_for_unsafe_access_entry;

  static address _atomic_xchg_entry;
  static address _atomic_xchg_ptr_entry;
  static address _atomic_store_entry;
  static address _atomic_store_ptr_entry;
  static address _atomic_cmpxchg_entry;
  static address _atomic_cmpxchg_ptr_entry;
  static address _atomic_cmpxchg_long_entry;
  static address _atomic_add_entry;
  static address _atomic_add_ptr_entry;
  static address _fence_entry;
  static address _d2i_wrapper;
  static address _d2l_wrapper;

  static jint    _fpu_cntrl_wrd_std;
  static jint    _fpu_cntrl_wrd_24;
  static jint    _fpu_cntrl_wrd_64;
  static jint    _fpu_cntrl_wrd_trunc;
  static jint    _mxcsr_std;
  static jint    _fpu_subnormal_bias1[3];
  static jint    _fpu_subnormal_bias2[3];

  static BufferBlob* _code1;                               // code buffer for initial routines
  static BufferBlob* _code2;                               // code buffer for all other routines

  // Leaf routines which implement arraycopy and their addresses
  // arraycopy operands aligned on element type boundary
  static address _jbyte_arraycopy;
  static address _jshort_arraycopy;
  static address _jint_arraycopy;
  static address _jlong_arraycopy;
  static address _oop_arraycopy, _oop_arraycopy_uninit;
  static address _jbyte_disjoint_arraycopy;
  static address _jshort_disjoint_arraycopy;
  static address _jint_disjoint_arraycopy;
  static address _jlong_disjoint_arraycopy;
  static address _oop_disjoint_arraycopy, _oop_disjoint_arraycopy_uninit;

  // arraycopy operands aligned on zero'th element boundary
  // These are identical to the ones aligned aligned on an
  // element type boundary, except that they assume that both
  // source and destination are HeapWord aligned.
  static address _arrayof_jbyte_arraycopy;
  static address _arrayof_jshort_arraycopy;
  static address _arrayof_jint_arraycopy;
  static address _arrayof_jlong_arraycopy;
  static address _arrayof_oop_arraycopy, _arrayof_oop_arraycopy_uninit;
  static address _arrayof_jbyte_disjoint_arraycopy;
  static address _arrayof_jshort_disjoint_arraycopy;
  static address _arrayof_jint_disjoint_arraycopy;
  static address _arrayof_jlong_disjoint_arraycopy;
  static address _arrayof_oop_disjoint_arraycopy, _arrayof_oop_disjoint_arraycopy_uninit;

  // these are recommended but optional:
  static address _checkcast_arraycopy, _checkcast_arraycopy_uninit;
  static address _unsafe_arraycopy;
  static address _generic_arraycopy;

  static address _jbyte_fill;
  static address _jshort_fill;
  static address _jint_fill;
  static address _arrayof_jbyte_fill;
  static address _arrayof_jshort_fill;
  static address _arrayof_jint_fill;

  // zero heap space aligned to jlong (8 bytes)
  static address _zero_aligned_words;

  static address _aescrypt_encryptBlock;
  static address _aescrypt_decryptBlock;
  static address _cipherBlockChaining_encryptAESCrypt;
  static address _cipherBlockChaining_decryptAESCrypt;

  static address _updateBytesCRC32;
  static address _crc_table_adr;

  // These are versions of the java.lang.Math methods which perform
  // the same operations as the intrinsic version.  They are used for
  // constant folding in the compiler to ensure equivalence.  If the
  // intrinsic version returns the same result as the strict version
  // then they can be set to the appropriate function from
  // SharedRuntime.
  static double (*_intrinsic_log)(double);
  static double (*_intrinsic_log10)(double);
  static double (*_intrinsic_exp)(double);
  static double (*_intrinsic_pow)(double, double);
  static double (*_intrinsic_sin)(double);
  static double (*_intrinsic_cos)(double);
  static double (*_intrinsic_tan)(double);

  // Safefetch stubs.
  static address _safefetch32_entry;
  static address _safefetch32_fault_pc;
  static address _safefetch32_continuation_pc;
  static address _safefetchN_entry;
  static address _safefetchN_fault_pc;
  static address _safefetchN_continuation_pc;

 public:
  // Initialization/Testing
  static void    initialize1();                            // must happen before universe::genesis
  static void    initialize2();                            // must happen after  universe::genesis

  static bool is_stub_code(address addr)                   { return contains(addr); }

  static bool contains(address addr) {
    return
      (_code1 != NULL && _code1->blob_contains(addr)) ||
      (_code2 != NULL && _code2->blob_contains(addr)) ;
  }

  static CodeBlob* code1() { return _code1; }
  static CodeBlob* code2() { return _code2; }

  // Debugging
  static jint    verify_oop_count()                        { return _verify_oop_count; }
  static jint*   verify_oop_count_addr()                   { return &_verify_oop_count; }
  // a subroutine for debugging the GC
  static address verify_oop_subroutine_entry_address()    { return (address)&_verify_oop_subroutine_entry; }

  static address catch_exception_entry()                   { return _catch_exception_entry; }

  // Calls to Java
  typedef void (*CallStub)(
    address   link,
    intptr_t* result,
    BasicType result_type,
    Method* method,
    address   entry_point,
    intptr_t* parameters,
    int       size_of_parameters,
    TRAPS
  );

  static CallStub call_stub()                              { return CAST_TO_FN_PTR(CallStub, _call_stub_entry); }

  // Exceptions
  static address forward_exception_entry()                 { return _forward_exception_entry; }
  // Implicit exceptions
  static address throw_AbstractMethodError_entry()         { return _throw_AbstractMethodError_entry; }
  static address throw_IncompatibleClassChangeError_entry(){ return _throw_IncompatibleClassChangeError_entry; }
  static address throw_NullPointerException_at_call_entry(){ return _throw_NullPointerException_at_call_entry; }
  static address throw_StackOverflowError_entry()          { return _throw_StackOverflowError_entry; }

  // Exceptions during unsafe access - should throw Java exception rather
  // than crash.
  static address handler_for_unsafe_access()               { return _handler_for_unsafe_access_entry; }

  static address atomic_xchg_entry()                       { return _atomic_xchg_entry; }
  static address atomic_xchg_ptr_entry()                   { return _atomic_xchg_ptr_entry; }
  static address atomic_store_entry()                      { return _atomic_store_entry; }
  static address atomic_store_ptr_entry()                  { return _atomic_store_ptr_entry; }
  static address atomic_cmpxchg_entry()                    { return _atomic_cmpxchg_entry; }
  static address atomic_cmpxchg_ptr_entry()                { return _atomic_cmpxchg_ptr_entry; }
  static address atomic_cmpxchg_long_entry()               { return _atomic_cmpxchg_long_entry; }
  static address atomic_add_entry()                        { return _atomic_add_entry; }
  static address atomic_add_ptr_entry()                    { return _atomic_add_ptr_entry; }
  static address fence_entry()                             { return _fence_entry; }

  static address d2i_wrapper()                             { return _d2i_wrapper; }
  static address d2l_wrapper()                             { return _d2l_wrapper; }
  static jint    fpu_cntrl_wrd_std()                       { return _fpu_cntrl_wrd_std;   }
  static address addr_fpu_cntrl_wrd_std()                  { return (address)&_fpu_cntrl_wrd_std;   }
  static address addr_fpu_cntrl_wrd_24()                   { return (address)&_fpu_cntrl_wrd_24;   }
  static address addr_fpu_cntrl_wrd_64()                   { return (address)&_fpu_cntrl_wrd_64;   }
  static address addr_fpu_cntrl_wrd_trunc()                { return (address)&_fpu_cntrl_wrd_trunc; }
  static address addr_mxcsr_std()                          { return (address)&_mxcsr_std; }
  static address addr_fpu_subnormal_bias1()                { return (address)&_fpu_subnormal_bias1; }
  static address addr_fpu_subnormal_bias2()                { return (address)&_fpu_subnormal_bias2; }


  static address select_arraycopy_function(BasicType t, bool aligned, bool disjoint, const char* &name, bool dest_uninitialized);

  static address jbyte_arraycopy()  { return _jbyte_arraycopy; }
  static address jshort_arraycopy() { return _jshort_arraycopy; }
  static address jint_arraycopy()   { return _jint_arraycopy; }
  static address jlong_arraycopy()  { return _jlong_arraycopy; }
  static address oop_arraycopy(bool dest_uninitialized = false) {
    return dest_uninitialized ? _oop_arraycopy_uninit : _oop_arraycopy;
  }
  static address jbyte_disjoint_arraycopy()  { return _jbyte_disjoint_arraycopy; }
  static address jshort_disjoint_arraycopy() { return _jshort_disjoint_arraycopy; }
  static address jint_disjoint_arraycopy()   { return _jint_disjoint_arraycopy; }
  static address jlong_disjoint_arraycopy()  { return _jlong_disjoint_arraycopy; }
  static address oop_disjoint_arraycopy(bool dest_uninitialized = false) {
    return dest_uninitialized ?  _oop_disjoint_arraycopy_uninit : _oop_disjoint_arraycopy;
  }

  static address arrayof_jbyte_arraycopy()  { return _arrayof_jbyte_arraycopy; }
  static address arrayof_jshort_arraycopy() { return _arrayof_jshort_arraycopy; }
  static address arrayof_jint_arraycopy()   { return _arrayof_jint_arraycopy; }
  static address arrayof_jlong_arraycopy()  { return _arrayof_jlong_arraycopy; }
  static address arrayof_oop_arraycopy(bool dest_uninitialized = false) {
    return dest_uninitialized ? _arrayof_oop_arraycopy_uninit : _arrayof_oop_arraycopy;
  }

  static address arrayof_jbyte_disjoint_arraycopy()  { return _arrayof_jbyte_disjoint_arraycopy; }
  static address arrayof_jshort_disjoint_arraycopy() { return _arrayof_jshort_disjoint_arraycopy; }
  static address arrayof_jint_disjoint_arraycopy()   { return _arrayof_jint_disjoint_arraycopy; }
  static address arrayof_jlong_disjoint_arraycopy()  { return _arrayof_jlong_disjoint_arraycopy; }
  static address arrayof_oop_disjoint_arraycopy(bool dest_uninitialized = false) {
    return dest_uninitialized ? _arrayof_oop_disjoint_arraycopy_uninit : _arrayof_oop_disjoint_arraycopy;
  }

  static address checkcast_arraycopy(bool dest_uninitialized = false) {
    return dest_uninitialized ? _checkcast_arraycopy_uninit : _checkcast_arraycopy;
  }
  static address unsafe_arraycopy()        { return _unsafe_arraycopy; }
  static address generic_arraycopy()       { return _generic_arraycopy; }

  static address jbyte_fill()          { return _jbyte_fill; }
  static address jshort_fill()         { return _jshort_fill; }
  static address jint_fill()           { return _jint_fill; }
  static address arrayof_jbyte_fill()  { return _arrayof_jbyte_fill; }
  static address arrayof_jshort_fill() { return _arrayof_jshort_fill; }
  static address arrayof_jint_fill()   { return _arrayof_jint_fill; }

  static address aescrypt_encryptBlock()                { return _aescrypt_encryptBlock; }
  static address aescrypt_decryptBlock()                { return _aescrypt_decryptBlock; }
  static address cipherBlockChaining_encryptAESCrypt()  { return _cipherBlockChaining_encryptAESCrypt; }
  static address cipherBlockChaining_decryptAESCrypt()  { return _cipherBlockChaining_decryptAESCrypt; }

  static address updateBytesCRC32()    { return _updateBytesCRC32; }
  static address crc_table_addr()      { return _crc_table_adr; }

  static address select_fill_function(BasicType t, bool aligned, const char* &name);

  static address zero_aligned_words()   { return _zero_aligned_words; }

  static double  intrinsic_log(double d) {
    assert(_intrinsic_log != NULL, "must be defined");
    return _intrinsic_log(d);
  }
  static double  intrinsic_log10(double d) {
    assert(_intrinsic_log != NULL, "must be defined");
    return _intrinsic_log10(d);
  }
  static double  intrinsic_exp(double d) {
    assert(_intrinsic_exp != NULL, "must be defined");
    return _intrinsic_exp(d);
  }
  static double  intrinsic_pow(double d, double d2) {
    assert(_intrinsic_pow != NULL, "must be defined");
    return _intrinsic_pow(d, d2);
  }
  static double  intrinsic_sin(double d) {
    assert(_intrinsic_sin != NULL, "must be defined");
    return _intrinsic_sin(d);
  }
  static double  intrinsic_cos(double d) {
    assert(_intrinsic_cos != NULL, "must be defined");
    return _intrinsic_cos(d);
  }
  static double  intrinsic_tan(double d) {
    assert(_intrinsic_tan != NULL, "must be defined");
    return _intrinsic_tan(d);
  }

  //
  // Safefetch stub support
  //

  typedef int      (*SafeFetch32Stub)(int*      adr, int      errValue);
  typedef intptr_t (*SafeFetchNStub) (intptr_t* adr, intptr_t errValue);

  static SafeFetch32Stub SafeFetch32_stub() { return CAST_TO_FN_PTR(SafeFetch32Stub, _safefetch32_entry); }
  static SafeFetchNStub  SafeFetchN_stub()  { return CAST_TO_FN_PTR(SafeFetchNStub,  _safefetchN_entry); }

  static bool is_safefetch_fault(address pc) {
    return pc != NULL &&
          (pc == _safefetch32_fault_pc ||
           pc == _safefetchN_fault_pc);
  }

  static address continuation_for_safefetch_fault(address pc) {
    assert(_safefetch32_continuation_pc != NULL &&
           _safefetchN_continuation_pc  != NULL,
           "not initialized");

    if (pc == _safefetch32_fault_pc) return _safefetch32_continuation_pc;
    if (pc == _safefetchN_fault_pc)  return _safefetchN_continuation_pc;

    ShouldNotReachHere();
    return NULL;
  }

  //
  // Default versions of the above arraycopy functions for platforms which do
  // not have specialized versions
  //
  static void jbyte_copy     (jbyte*  src, jbyte*  dest, size_t count);
  static void jshort_copy    (jshort* src, jshort* dest, size_t count);
  static void jint_copy      (jint*   src, jint*   dest, size_t count);
  static void jlong_copy     (jlong*  src, jlong*  dest, size_t count);
  static void oop_copy       (oop*    src, oop*    dest, size_t count);
  static void oop_copy_uninit(oop*    src, oop*    dest, size_t count);

  static void arrayof_jbyte_copy     (HeapWord* src, HeapWord* dest, size_t count);
  static void arrayof_jshort_copy    (HeapWord* src, HeapWord* dest, size_t count);
  static void arrayof_jint_copy      (HeapWord* src, HeapWord* dest, size_t count);
  static void arrayof_jlong_copy     (HeapWord* src, HeapWord* dest, size_t count);
  static void arrayof_oop_copy       (HeapWord* src, HeapWord* dest, size_t count);
  static void arrayof_oop_copy_uninit(HeapWord* src, HeapWord* dest, size_t count);
};

// Safefetch allows to load a value from a location that's not known
// to be valid. If the load causes a fault, the error value is returned.
inline int SafeFetch32(int* adr, int errValue) {
  assert(StubRoutines::SafeFetch32_stub(), "stub not yet generated");
  return StubRoutines::SafeFetch32_stub()(adr, errValue);
}
inline intptr_t SafeFetchN(intptr_t* adr, intptr_t errValue) {
  assert(StubRoutines::SafeFetchN_stub(), "stub not yet generated");
  return StubRoutines::SafeFetchN_stub()(adr, errValue);
}

#endif // SHARE_VM_RUNTIME_STUBROUTINES_HPP

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