JDK14/Java14源码在线阅读

/*
 * Copyright (c) 2016, 2019, Oracle and/or its affiliates. All rights reserved.
 * Copyright (c) 2016 SAP SE. 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 CPU_S390_C1_MACROASSEMBLER_S390_HPP
#define CPU_S390_C1_MACROASSEMBLER_S390_HPP

  void pd_init() { /* nothing to do */ }

 public:
  void try_allocate(
    Register obj,                      // result: Pointer to object after successful allocation.
    Register var_size_in_bytes,        // Object size in bytes if unknown at compile time; invalid otherwise.
    int      con_size_in_bytes,        // Object size in bytes if   known at compile time.
    Register t1,                       // temp register
    Label&   slow_case                 // Continuation point if fast allocation fails.
  );

  void initialize_header(Register obj, Register klass, Register len, Register Rzero, Register t1);
  void initialize_body(Register objectFields, Register len_in_bytes, Register Rzero);

  // locking
  // hdr     : Used to hold locked markWord to be CASed into obj, contents destroyed.
  // obj     : Must point to the object to lock, contents preserved.
  // disp_hdr: Must point to the displaced header location, contents preserved.
  // Returns code offset at which to add null check debug information.
  void lock_object(Register hdr, Register obj, Register disp_hdr, Label& slow_case);

  // unlocking
  // hdr     : Used to hold original markWord to be CASed back into obj, contents destroyed.
  // obj     : Must point to the object to lock, contents preserved.
  // disp_hdr: Must point to the displaced header location, contents destroyed.
  void unlock_object(Register hdr, Register obj, Register lock, Label& slow_case);

  void initialize_object(
    Register obj,                      // result: Pointer to object after successful allocation.
    Register klass,                    // object klass
    Register var_size_in_bytes,        // Object size in bytes if unknown at compile time; invalid otherwise.
    int      con_size_in_bytes,        // Object size in bytes if   known at compile time.
    Register t1,                       // temp register
    Register t2                        // temp register
  );

  // Allocation of fixed-size objects.
  // This can also be used to allocate fixed-size arrays, by setting
  // hdr_size correctly and storing the array length afterwards.
  void allocate_object(
    Register obj,                      // result: Pointer to object after successful allocation.
    Register t1,                       // temp register
    Register t2,                       // temp register
    int      hdr_size,                 // object header size in words
    int      obj_size,                 // object size in words
    Register klass,                    // object klass
    Label&   slow_case                 // Continuation point if fast allocation fails.
  );

  enum {
    max_array_allocation_length = 0x01000000 // Sparc friendly value, requires sethi only.
  };

  // Allocation of arrays.
  void allocate_array(
    Register obj,                      // result: Pointer to array after successful allocation.
    Register len,                      // array length
    Register t1,                       // temp register
    Register t2,                       // temp register
    int      hdr_size,                 // object header size in words
    int      elt_size,                 // element size in bytes
    Register klass,                    // object klass

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