jdk8-mips64-public/hotspot: src/share/vm/runtime/javaFrameAnchor.hpp@fd44df5e3bc3

     1 /*

     2  * Copyright (c) 2002, 2011, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  *

    23  */

    25 /*

    26  * This file has been modified by Loongson Technology in 2015. These

    27  * modifications are Copyright (c) 2015 Loongson Technology, and are made

    28  * available on the same license terms set forth above.

    29  */

    31 #ifndef SHARE_VM_RUNTIME_JAVAFRAMEANCHOR_HPP

    32 #define SHARE_VM_RUNTIME_JAVAFRAMEANCHOR_HPP

    34 #include "utilities/globalDefinitions.hpp"

    35 #include "runtime/orderAccess.inline.hpp"

    37 //

    38 // An object for encapsulating the machine/os dependent part of a JavaThread frame state

    39 //

    40 class JavaThread;

    42 class JavaFrameAnchor VALUE_OBJ_CLASS_SPEC {

    43 // Too many friends...

    44 friend class CallNativeDirectNode;

    45 friend class OptoRuntime;

    46 friend class Runtime1;

    47 friend class StubAssembler;

    48 friend class CallRuntimeDirectNode;

    49 friend class MacroAssembler;

    50 friend class InterpreterGenerator;

    51 friend class LIR_Assembler;

    52 friend class GraphKit;

    53 friend class StubGenerator;

    54 friend class JavaThread;

    55 friend class frame;

    56 friend class VMStructs;

    57 friend class BytecodeInterpreter;

    58 friend class JavaCallWrapper;

    60  private:

    61   //

    62   // Whenever _last_Java_sp != NULL other anchor fields MUST be valid!

    63   // The stack may not be walkable [check with walkable() ] but the values must be valid.

    64   // The profiler apparently depends on this.

    65   //

    66   intptr_t* volatile _last_Java_sp;

    68   // Whenever we call from Java to native we can not be assured that the return

    69   // address that composes the last_Java_frame will be in an accessible location

    70   // so calls from Java to native store that pc (or one good enough to locate

    71   // the oopmap) in the frame anchor. Since the frames that call from Java to

    72   // native are never deoptimized we never need to patch the pc and so this

    73   // is acceptable.

    74   volatile  address _last_Java_pc;

    76   // tells whether the last Java frame is set

    77   // It is important that when last_Java_sp != NULL that the rest of the frame

    78   // anchor (including platform specific) all be valid.

    80   bool has_last_Java_frame() const                   { return _last_Java_sp != NULL; }

    81   // This is very dangerous unless sp == NULL

    82   // Invalidate the anchor so that has_last_frame is false

    83   // and no one should look at the other fields.

    84   void zap(void)                                     { _last_Java_sp = NULL; }

    86 #ifdef TARGET_ARCH_x86

    87 # include "javaFrameAnchor_x86.hpp"

    88 #endif

    89 #ifdef TARGET_ARCH_mips

    90 # include "javaFrameAnchor_mips.hpp"

    91 #endif

    92 #ifdef TARGET_ARCH_sparc

    93 # include "javaFrameAnchor_sparc.hpp"

    94 #endif

    95 #ifdef TARGET_ARCH_zero

    96 # include "javaFrameAnchor_zero.hpp"

    97 #endif

    98 #ifdef TARGET_ARCH_arm

    99 # include "javaFrameAnchor_arm.hpp"

   100 #endif

   101 #ifdef TARGET_ARCH_ppc

   102 # include "javaFrameAnchor_ppc.hpp"

   103 #endif

   106 public:

   107   JavaFrameAnchor()                              { clear(); }

   108   JavaFrameAnchor(JavaFrameAnchor *src)          { copy(src); }

   110   void set_last_Java_pc(address pc)              { _last_Java_pc = pc; }

   112   // Assembly stub generation helpers

   114   static ByteSize last_Java_sp_offset()          { return byte_offset_of(JavaFrameAnchor, _last_Java_sp); }

   115   static ByteSize last_Java_pc_offset()          { return byte_offset_of(JavaFrameAnchor, _last_Java_pc); }

   117 };

   119 #endif // SHARE_VM_RUNTIME_JAVAFRAMEANCHOR_HPP

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