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  */
  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 #ifdef TARGET_OS_ARCH_linux_arm
  48 # include "orderAccess_linux_arm.inline.hpp"
  49 #endif
  50 #ifdef TARGET_OS_ARCH_linux_ppc
  51 # include "orderAccess_linux_ppc.inline.hpp"
  52 #endif
  53 //
  54 // An object for encapsulating the machine/os dependent part of a JavaThread frame state
  55 //
  56 class JavaThread;
  57 
  58 class JavaFrameAnchor VALUE_OBJ_CLASS_SPEC {
  59 // Too many friends...
  60 friend class CallNativeDirectNode;
  61 friend class OptoRuntime;
  62 friend class Runtime1;
  63 friend class StubAssembler;
  64 friend class CallRuntimeDirectNode;
  65 friend class MacroAssembler;
  66 friend class InterpreterGenerator;
  67 friend class LIR_Assembler;
  68 friend class GraphKit;
  69 friend class StubGenerator;
  70 friend class JavaThread;
  71 friend class frame;
  72 friend class VMStructs;
  73 friend class BytecodeInterpreter;
  74 friend class JavaCallWrapper;
  75 
  76  private:
  77   //
  78   // Whenever _last_Java_sp != NULL other anchor fields MUST be valid!
  79   // The stack may not be walkable [check with walkable() ] but the values must be valid.
  80   // The profiler apparently depends on this.
  81   //
  82   intptr_t* volatile _last_Java_sp;
  83 
  84   // Whenever we call from Java to native we can not be assured that the return
  85   // address that composes the last_Java_frame will be in an accessible location
  86   // so calls from Java to native store that pc (or one good enough to locate
  87   // the oopmap) in the frame anchor. Since the frames that call from Java to
  88   // native are never deoptimized we never need to patch the pc and so this
  89   // is acceptable.
  90   volatile  address _last_Java_pc;
  91 
  92   // tells whether the last Java frame is set
  93   // It is important that when last_Java_sp != NULL that the rest of the frame
  94   // anchor (including platform specific) all be valid.
  95 
  96   bool has_last_Java_frame() const                   { return _last_Java_sp != NULL; }
  97   // This is very dangerous unless sp == NULL
  98   // Invalidate the anchor so that has_last_frame is false
  99   // and no one should look at the other fields.
 100   void zap(void)                                     { _last_Java_sp = NULL; }
 101 
 102 #ifdef TARGET_ARCH_x86
 103 # include "javaFrameAnchor_x86.hpp"
 104 #endif
 105 #ifdef TARGET_ARCH_sparc
 106 # include "javaFrameAnchor_sparc.hpp"
 107 #endif
 108 #ifdef TARGET_ARCH_zero
 109 # include "javaFrameAnchor_zero.hpp"
 110 #endif
 111 #ifdef TARGET_ARCH_arm
 112 # include "javaFrameAnchor_arm.hpp"
 113 #endif
 114 #ifdef TARGET_ARCH_ppc
 115 # include "javaFrameAnchor_ppc.hpp"
 116 #endif
 117 
 118 
 119 public:
 120   JavaFrameAnchor()                              { clear(); }
 121   JavaFrameAnchor(JavaFrameAnchor *src)          { copy(src); }
 122 
 123   void set_last_Java_pc(address pc)              { _last_Java_pc = pc; }
 124 
 125   // Assembly stub generation helpers
 126 
 127   static ByteSize last_Java_sp_offset()          { return byte_offset_of(JavaFrameAnchor, _last_Java_sp); }
 128   static ByteSize last_Java_pc_offset()          { return byte_offset_of(JavaFrameAnchor, _last_Java_pc); }
 129 
 130 };
 131 
 132 #endif // SHARE_VM_RUNTIME_JAVAFRAMEANCHOR_HPP