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 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 // 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