duke@435: /*
trims@2708:  * Copyright (c) 2002, 2011, Oracle and/or its affiliates. All rights reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
trims@1907:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907:  * or visit www.oracle.com if you need additional information or have any
trims@1907:  * questions.
duke@435:  *
duke@435:  */
stefank@2314: 
stefank@2314: #ifndef SHARE_VM_RUNTIME_JAVAFRAMEANCHOR_HPP
stefank@2314: #define SHARE_VM_RUNTIME_JAVAFRAMEANCHOR_HPP
stefank@2314: 
stefank@2314: #include "utilities/globalDefinitions.hpp"
goetz@6911: #include "runtime/orderAccess.inline.hpp"
never@3156: 
duke@435: //
duke@435: // An object for encapsulating the machine/os dependent part of a JavaThread frame state
duke@435: //
duke@435: class JavaThread;
duke@435: 
duke@435: class JavaFrameAnchor VALUE_OBJ_CLASS_SPEC {
duke@435: // Too many friends...
duke@435: friend class CallNativeDirectNode;
duke@435: friend class OptoRuntime;
duke@435: friend class Runtime1;
duke@435: friend class StubAssembler;
duke@435: friend class CallRuntimeDirectNode;
duke@435: friend class MacroAssembler;
duke@435: friend class InterpreterGenerator;
duke@435: friend class LIR_Assembler;
duke@435: friend class GraphKit;
duke@435: friend class StubGenerator;
duke@435: friend class JavaThread;
duke@435: friend class frame;
duke@435: friend class VMStructs;
duke@435: friend class BytecodeInterpreter;
duke@435: friend class JavaCallWrapper;
duke@435: 
duke@435:  private:
duke@435:   //
duke@435:   // Whenever _last_Java_sp != NULL other anchor fields MUST be valid!
duke@435:   // The stack may not be walkable [check with walkable() ] but the values must be valid.
duke@435:   // The profiler apparently depends on this.
duke@435:   //
duke@435:   intptr_t* volatile _last_Java_sp;
duke@435: 
duke@435:   // Whenever we call from Java to native we can not be assured that the return
duke@435:   // address that composes the last_Java_frame will be in an accessible location
duke@435:   // so calls from Java to native store that pc (or one good enough to locate
duke@435:   // the oopmap) in the frame anchor. Since the frames that call from Java to
duke@435:   // native are never deoptimized we never need to patch the pc and so this
duke@435:   // is acceptable.
duke@435:   volatile  address _last_Java_pc;
duke@435: 
duke@435:   // tells whether the last Java frame is set
duke@435:   // It is important that when last_Java_sp != NULL that the rest of the frame
duke@435:   // anchor (including platform specific) all be valid.
duke@435: 
duke@435:   bool has_last_Java_frame() const                   { return _last_Java_sp != NULL; }
duke@435:   // This is very dangerous unless sp == NULL
duke@435:   // Invalidate the anchor so that has_last_frame is false
duke@435:   // and no one should look at the other fields.
duke@435:   void zap(void)                                     { _last_Java_sp = NULL; }
duke@435: 
stefank@2314: #ifdef TARGET_ARCH_x86
stefank@2314: # include "javaFrameAnchor_x86.hpp"
stefank@2314: #endif
stefank@2314: #ifdef TARGET_ARCH_sparc
stefank@2314: # include "javaFrameAnchor_sparc.hpp"
stefank@2314: #endif
stefank@2314: #ifdef TARGET_ARCH_zero
stefank@2314: # include "javaFrameAnchor_zero.hpp"
stefank@2314: #endif
bobv@2508: #ifdef TARGET_ARCH_arm
bobv@2508: # include "javaFrameAnchor_arm.hpp"
bobv@2508: #endif
bobv@2508: #ifdef TARGET_ARCH_ppc
bobv@2508: # include "javaFrameAnchor_ppc.hpp"
bobv@2508: #endif
stefank@2314: 
duke@435: 
duke@435: public:
duke@435:   JavaFrameAnchor()                              { clear(); }
duke@435:   JavaFrameAnchor(JavaFrameAnchor *src)          { copy(src); }
duke@435: 
duke@435:   void set_last_Java_pc(address pc)              { _last_Java_pc = pc; }
duke@435: 
duke@435:   // Assembly stub generation helpers
duke@435: 
duke@435:   static ByteSize last_Java_sp_offset()          { return byte_offset_of(JavaFrameAnchor, _last_Java_sp); }
duke@435:   static ByteSize last_Java_pc_offset()          { return byte_offset_of(JavaFrameAnchor, _last_Java_pc); }
duke@435: 
duke@435: };
stefank@2314: 
stefank@2314: #endif // SHARE_VM_RUNTIME_JAVAFRAMEANCHOR_HPP