1/*
2 * Copyright (c) 2002, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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24
25#ifndef SHARE_RUNTIME_JAVAFRAMEANCHOR_HPP
26#define SHARE_RUNTIME_JAVAFRAMEANCHOR_HPP
27
28#include "runtime/orderAccess.hpp"
29#include "utilities/globalDefinitions.hpp"
30#include "utilities/macros.hpp"
31
32//
33// An object for encapsulating the machine/os dependent part of a JavaThread frame state
34//
35class JavaThread;
36class MacroAssembler;
37
38class JavaFrameAnchor {
39// Too many friends...
40friend class CallNativeDirectNode;
41friend class OptoRuntime;
42friend class Runtime1;
43friend class StubAssembler;
44friend class CallRuntimeDirectNode;
45friend class MacroAssembler;
46friend class LIR_Assembler;
47friend class GraphKit;
48friend class StubGenerator;
49friend class JavaThread;
50friend class frame;
51friend class VMStructs;
52friend class JVMCIVMStructs;
53friend class BytecodeInterpreter;
54friend class JavaCallWrapper;
55
56 private:
57 //
58 // Whenever _last_Java_sp != NULL other anchor fields MUST be valid!
59 // The stack may not be walkable [check with walkable() ] but the values must be valid.
60 // The profiler apparently depends on this.
61 //
62 intptr_t* volatile _last_Java_sp;
63
64 // Whenever we call from Java to native we can not be assured that the return
65 // address that composes the last_Java_frame will be in an accessible location
66 // so calls from Java to native store that pc (or one good enough to locate
67 // the oopmap) in the frame anchor. Since the frames that call from Java to
68 // native are never deoptimized we never need to patch the pc and so this
69 // is acceptable.
70 volatile address _last_Java_pc;
71
72 // tells whether the last Java frame is set
73 // It is important that when last_Java_sp != NULL that the rest of the frame
74 // anchor (including platform specific) all be valid.
75
76 bool has_last_Java_frame() const { return _last_Java_sp != NULL; }
77 // This is very dangerous unless sp == NULL
78 // Invalidate the anchor so that has_last_frame is false
79 // and no one should look at the other fields.
80 void zap(void) { _last_Java_sp = NULL; }
81
82#include CPU_HEADER(javaFrameAnchor)
83
84public:
85 JavaFrameAnchor() { clear(); }
86 JavaFrameAnchor(JavaFrameAnchor *src) { copy(src); }
87
88 void set_last_Java_pc(address pc) { _last_Java_pc = pc; }
89
90 // Assembly stub generation helpers
91
92 static ByteSize last_Java_sp_offset() { return byte_offset_of(JavaFrameAnchor, _last_Java_sp); }
93 static ByteSize last_Java_pc_offset() { return byte_offset_of(JavaFrameAnchor, _last_Java_pc); }
94
95};
96
97#endif // SHARE_RUNTIME_JAVAFRAMEANCHOR_HPP
98