1 /*
 2  * Copyright (c) 2019, 2024, Oracle and/or its affiliates. All rights reserved.
 3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 5  * This code is free software; you can redistribute it and/or modify it
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 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).
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24 
25 #ifndef CPU_ZERO_SMALLREGISTERMAP_ZERO_INLINE_HPP
26 #define CPU_ZERO_SMALLREGISTERMAP_ZERO_INLINE_HPP
27 
28 #include "runtime/frame.inline.hpp"
29 #include "runtime/registerMap.hpp"
30 
31 class SmallRegisterMap;
32 
33 // Java frames don't have callee saved registers (except for rfp), so we can use a smaller RegisterMap
34 template <bool IncludeArgs>
35 class SmallRegisterMapType {
36   friend SmallRegisterMap;
37 
38   constexpr SmallRegisterMapType() = default;
39   ~SmallRegisterMapType() = default;
40   NONCOPYABLE(SmallRegisterMapType);
41 
42   static void assert_is_rfp(VMReg r) NOT_DEBUG_RETURN
43                                      DEBUG_ONLY({ Unimplemented(); })
44 public:
45   // as_RegisterMap is used when we didn't want to templatize and abstract over RegisterMap type to support SmallRegisterMap
46   // Consider enhancing SmallRegisterMap to support those cases
47   const RegisterMap* as_RegisterMap() const { return nullptr; }
48   RegisterMap* as_RegisterMap() { return nullptr; }
49 
50   RegisterMap* copy_to_RegisterMap(RegisterMap* map, intptr_t* sp) const {
51     Unimplemented();
52     return map;
53   }
54 
55   inline address location(VMReg reg, intptr_t* sp) const {
56     Unimplemented();
57     return nullptr;
58   }
59 
60   inline void set_location(VMReg reg, address loc) { assert_is_rfp(reg); }
61 
62   JavaThread* thread() const {
63   #ifndef ASSERT
64     guarantee (false, "");
65   #endif
66     return nullptr;
67   }
68 
69   bool update_map()    const { return false; }
70   bool walk_cont()     const { return false; }
71   bool include_argument_oops() const { return IncludeArgs; }
72   void set_include_argument_oops(bool f)  {}
73   bool in_cont()       const { return false; }
74   stackChunkHandle stack_chunk() const { return stackChunkHandle(); }
75 
76 #ifdef ASSERT
77   bool should_skip_missing() const  { return false; }
78   VMReg find_register_spilled_here(void* p, intptr_t* sp) {
79     Unimplemented();
80     return nullptr;
81   }
82   void print() const { print_on(tty); }
83   void print_on(outputStream* st) const { st->print_cr("Small register map"); }
84 #endif
85 };
86 
87 #endif // CPU_ZERO_SMALLREGISTERMAP_ZERO_INLINE_HPP