Mercurial > hg > graal-compiler
annotate src/share/vm/runtime/registerMap.hpp @ 1782:f353275af40e
6981773: incorrect fill value with OptimizeFill
Reviewed-by: kvn, twisti
author | never |
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date | Thu, 02 Sep 2010 11:40:02 -0700 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
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0 | 1 /* |
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2 * Copyright (c) 2002, 2007, Oracle and/or its affiliates. All rights reserved. |
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12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
25 class JavaThread; | |
26 | |
27 // | |
28 // RegisterMap | |
29 // | |
30 // A companion structure used for stack traversal. The RegisterMap contains | |
31 // misc. information needed in order to do correct stack traversal of stack | |
32 // frames. Hence, it must always be passed in as an argument to | |
33 // frame::sender(RegisterMap*). | |
34 // | |
35 // In particular, | |
36 // 1) It provides access to the thread for which the stack belongs. The | |
37 // thread object is needed in order to get sender of a deoptimized frame. | |
38 // | |
39 // 2) It is used to pass information from a callee frame to its caller | |
40 // frame about how the frame should be traversed. This is used to let | |
41 // the caller frame take care of calling oops-do of out-going | |
42 // arguments, when the callee frame is not instantiated yet. This | |
43 // happens, e.g., when a compiled frame calls into | |
44 // resolve_virtual_call. (Hence, it is critical that the same | |
45 // RegisterMap object is used for the entire stack walk. Normally, | |
46 // this is hidden by using the StackFrameStream.) This is used when | |
47 // doing follow_oops and oops_do. | |
48 // | |
49 // 3) The RegisterMap keeps track of the values of callee-saved registers | |
50 // from frame to frame (hence, the name). For some stack traversal the | |
51 // values of the callee-saved registers does not matter, e.g., if you | |
52 // only need the static properies such as frame type, pc, and such. | |
53 // Updating of the RegisterMap can be turned off by instantiating the | |
54 // register map as: RegisterMap map(thread, false); | |
55 | |
56 class RegisterMap : public StackObj { | |
57 public: | |
58 typedef julong LocationValidType; | |
59 enum { | |
60 reg_count = ConcreteRegisterImpl::number_of_registers, | |
61 location_valid_type_size = sizeof(LocationValidType)*8, | |
62 location_valid_size = (reg_count+location_valid_type_size-1)/location_valid_type_size | |
63 }; | |
64 private: | |
65 intptr_t* _location[reg_count]; // Location of registers (intptr_t* looks better than address in the debugger) | |
66 LocationValidType _location_valid[location_valid_size]; | |
67 bool _include_argument_oops; // Should include argument_oop marked locations for compiler | |
68 JavaThread* _thread; // Reference to current thread | |
69 bool _update_map; // Tells if the register map need to be | |
70 // updated when traversing the stack | |
71 | |
72 #ifdef ASSERT | |
73 void check_location_valid(); | |
74 #else | |
75 void check_location_valid() {} | |
76 #endif | |
77 | |
78 public: | |
79 debug_only(intptr_t* _update_for_id;) // Assert that RegisterMap is not updated twice for same frame | |
80 RegisterMap(JavaThread *thread, bool update_map = true); | |
81 RegisterMap(const RegisterMap* map); | |
82 | |
83 address location(VMReg reg) const { | |
84 int index = reg->value() / location_valid_type_size; | |
85 assert(0 <= reg->value() && reg->value() < reg_count, "range check"); | |
86 assert(0 <= index && index < location_valid_size, "range check"); | |
87 if (_location_valid[index] & ((LocationValidType)1 << (reg->value() % location_valid_type_size))) { | |
88 return (address) _location[reg->value()]; | |
89 } else { | |
90 return pd_location(reg); | |
91 } | |
92 } | |
93 | |
94 void set_location(VMReg reg, address loc) { | |
95 int index = reg->value() / location_valid_type_size; | |
96 assert(0 <= reg->value() && reg->value() < reg_count, "range check"); | |
97 assert(0 <= index && index < location_valid_size, "range check"); | |
98 assert(_update_map, "updating map that does not need updating"); | |
99 _location[reg->value()] = (intptr_t*) loc; | |
100 _location_valid[index] |= ((LocationValidType)1 << (reg->value() % location_valid_type_size)); | |
101 check_location_valid(); | |
102 } | |
103 | |
104 // Called by an entry frame. | |
105 void clear(); | |
106 | |
107 bool include_argument_oops() const { return _include_argument_oops; } | |
108 void set_include_argument_oops(bool f) { _include_argument_oops = f; } | |
109 | |
110 JavaThread *thread() const { return _thread; } | |
111 bool update_map() const { return _update_map; } | |
112 | |
113 void print_on(outputStream* st) const; | |
114 void print() const; | |
115 | |
116 // the following contains the definition of pd_xxx methods | |
117 # include "incls/_registerMap_pd.hpp.incl" | |
118 }; |