1 /*
   2  * Copyright (c) 2002, 2010, 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
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  23  */
  24 
  25 #ifndef SHARE_VM_RUNTIME_JAVAFRAMEANCHOR_HPP
  26 #define SHARE_VM_RUNTIME_JAVAFRAMEANCHOR_HPP
  27 
  28 #include "utilities/globalDefinitions.hpp"
  29 #ifdef TARGET_OS_ARCH_linux_x86
  30 # include "orderAccess_linux_x86.inline.hpp"
  31 #endif
  32 #ifdef TARGET_OS_ARCH_linux_sparc
  33 # include "orderAccess_linux_sparc.inline.hpp"
  34 #endif
  35 #ifdef TARGET_OS_ARCH_linux_zero
  36 # include "orderAccess_linux_zero.inline.hpp"
  37 #endif
  38 #ifdef TARGET_OS_ARCH_solaris_x86
  39 # include "orderAccess_solaris_x86.inline.hpp"
  40 #endif
  41 #ifdef TARGET_OS_ARCH_solaris_sparc
  42 # include "orderAccess_solaris_sparc.inline.hpp"
  43 #endif
  44 #ifdef TARGET_OS_ARCH_windows_x86
  45 # include "orderAccess_windows_x86.inline.hpp"
  46 #endif
  47 //
  48 // An object for encapsulating the machine/os dependent part of a JavaThread frame state
  49 //
  50 class JavaThread;
  51 
  52 class JavaFrameAnchor VALUE_OBJ_CLASS_SPEC {
  53 // Too many friends...
  54 friend class CallNativeDirectNode;
  55 friend class OptoRuntime;
  56 friend class Runtime1;
  57 friend class StubAssembler;
  58 friend class CallRuntimeDirectNode;
  59 friend class MacroAssembler;
  60 friend class InterpreterGenerator;
  61 friend class LIR_Assembler;
  62 friend class GraphKit;
  63 friend class StubGenerator;
  64 friend class JavaThread;
  65 friend class frame;
  66 friend class VMStructs;
  67 friend class BytecodeInterpreter;
  68 friend class JavaCallWrapper;
  69 
  70  private:
  71   //
  72   // Whenever _last_Java_sp != NULL other anchor fields MUST be valid!
  73   // The stack may not be walkable [check with walkable() ] but the values must be valid.
  74   // The profiler apparently depends on this.
  75   //
  76   intptr_t* volatile _last_Java_sp;
  77 
  78   // Whenever we call from Java to native we can not be assured that the return
  79   // address that composes the last_Java_frame will be in an accessible location
  80   // so calls from Java to native store that pc (or one good enough to locate
  81   // the oopmap) in the frame anchor. Since the frames that call from Java to
  82   // native are never deoptimized we never need to patch the pc and so this
  83   // is acceptable.
  84   volatile  address _last_Java_pc;
  85 
  86   // tells whether the last Java frame is set
  87   // It is important that when last_Java_sp != NULL that the rest of the frame
  88   // anchor (including platform specific) all be valid.
  89 
  90   bool has_last_Java_frame() const                   { return _last_Java_sp != NULL; }
  91   // This is very dangerous unless sp == NULL
  92   // Invalidate the anchor so that has_last_frame is false
  93   // and no one should look at the other fields.
  94   void zap(void)                                     { _last_Java_sp = NULL; }
  95 
  96 #ifdef TARGET_ARCH_x86
  97 # include "javaFrameAnchor_x86.hpp"
  98 #endif
  99 #ifdef TARGET_ARCH_sparc
 100 # include "javaFrameAnchor_sparc.hpp"
 101 #endif
 102 #ifdef TARGET_ARCH_zero
 103 # include "javaFrameAnchor_zero.hpp"
 104 #endif
 105 
 106 
 107 public:
 108   JavaFrameAnchor()                              { clear(); }
 109   JavaFrameAnchor(JavaFrameAnchor *src)          { copy(src); }
 110 
 111   void set_last_Java_pc(address pc)              { _last_Java_pc = pc; }
 112 
 113   // Assembly stub generation helpers
 114 
 115   static ByteSize last_Java_sp_offset()          { return byte_offset_of(JavaFrameAnchor, _last_Java_sp); }
 116   static ByteSize last_Java_pc_offset()          { return byte_offset_of(JavaFrameAnchor, _last_Java_pc); }
 117 
 118 };
 119 
 120 #endif // SHARE_VM_RUNTIME_JAVAFRAMEANCHOR_HPP