Mercurial > hg > truffle
annotate src/share/vm/code/scopeDesc.hpp @ 14397:53fa76359eb1
8016696: PPC64 (part 4): add relocation for trampoline stubs
Summary: A trampoline allows to encode a small branch in the code, even if there is the chance that this branch can not reach all possible code locations. If the relocation finds that a branch is too far for the instruction in the code, it can patch it to jump to the trampoline where is sufficient space for a far branch. Needed on PPC.
Reviewed-by: kvn, bdelsart, jrose
author | goetz |
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date | Thu, 04 Jul 2013 10:51:31 +0200 |
parents | da91efe96a93 |
children | e522a00b91aa 933c8a58c9dc |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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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 | |
1972 | 25 #ifndef SHARE_VM_CODE_SCOPEDESC_HPP |
26 #define SHARE_VM_CODE_SCOPEDESC_HPP | |
27 | |
28 #include "code/debugInfo.hpp" | |
29 #include "code/pcDesc.hpp" | |
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30 #include "oops/method.hpp" |
1972 | 31 #include "utilities/growableArray.hpp" |
32 | |
0 | 33 // SimpleScopeDesc is used when all you need to extract from |
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34 // a given pc,nmethod pair is a Method* and a bci. This is |
0 | 35 // quite a bit faster than allocating a full ScopeDesc, but |
36 // very limited in abilities. | |
37 | |
38 class SimpleScopeDesc : public StackObj { | |
39 private: | |
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40 Method* _method; |
0 | 41 int _bci; |
42 | |
43 public: | |
44 SimpleScopeDesc(nmethod* code,address pc) { | |
45 PcDesc* pc_desc = code->pc_desc_at(pc); | |
46 assert(pc_desc != NULL, "Must be able to find matching PcDesc"); | |
47 DebugInfoReadStream buffer(code, pc_desc->scope_decode_offset()); | |
48 int ignore_sender = buffer.read_int(); | |
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49 _method = buffer.read_method(); |
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50 _bci = buffer.read_bci(); |
0 | 51 } |
52 | |
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53 Method* method() { return _method; } |
0 | 54 int bci() { return _bci; } |
55 }; | |
56 | |
57 // ScopeDescs contain the information that makes source-level debugging of | |
58 // nmethods possible; each scopeDesc describes a method activation | |
59 | |
60 class ScopeDesc : public ResourceObj { | |
61 public: | |
62 // Constructor | |
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63 ScopeDesc(const nmethod* code, int decode_offset, int obj_decode_offset, bool reexecute, bool return_oop); |
0 | 64 |
65 // Calls above, giving default value of "serialized_null" to the | |
66 // "obj_decode_offset" argument. (We don't use a default argument to | |
67 // avoid a .hpp-.hpp dependency.) | |
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68 ScopeDesc(const nmethod* code, int decode_offset, bool reexecute, bool return_oop); |
0 | 69 |
70 // JVM state | |
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71 Method* method() const { return _method; } |
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72 int bci() const { return _bci; } |
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73 bool should_reexecute() const { return _reexecute; } |
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74 bool return_oop() const { return _return_oop; } |
0 | 75 |
76 GrowableArray<ScopeValue*>* locals(); | |
77 GrowableArray<ScopeValue*>* expressions(); | |
78 GrowableArray<MonitorValue*>* monitors(); | |
79 GrowableArray<ScopeValue*>* objects(); | |
80 | |
81 // Stack walking, returns NULL if this is the outer most scope. | |
82 ScopeDesc* sender() const; | |
83 | |
84 // Returns where the scope was decoded | |
85 int decode_offset() const { return _decode_offset; } | |
86 | |
87 // Tells whether sender() returns NULL | |
88 bool is_top() const; | |
89 // Tells whether sd is equal to this | |
90 bool is_equal(ScopeDesc* sd) const; | |
91 | |
92 private: | |
93 // Alternative constructor | |
94 ScopeDesc(const ScopeDesc* parent); | |
95 | |
96 // JVM state | |
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97 Method* _method; |
0 | 98 int _bci; |
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99 bool _reexecute; |
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100 bool _return_oop; |
0 | 101 |
102 // Decoding offsets | |
103 int _decode_offset; | |
104 int _sender_decode_offset; | |
105 int _locals_decode_offset; | |
106 int _expressions_decode_offset; | |
107 int _monitors_decode_offset; | |
108 | |
109 // Object pool | |
110 GrowableArray<ScopeValue*>* _objects; | |
111 | |
112 // Nmethod information | |
113 const nmethod* _code; | |
114 | |
115 // Decoding operations | |
116 void decode_body(); | |
117 GrowableArray<ScopeValue*>* decode_scope_values(int decode_offset); | |
118 GrowableArray<MonitorValue*>* decode_monitor_values(int decode_offset); | |
119 GrowableArray<ScopeValue*>* decode_object_values(int decode_offset); | |
120 | |
121 DebugInfoReadStream* stream_at(int decode_offset) const; | |
122 | |
123 | |
124 public: | |
125 // Verification | |
126 void verify(); | |
127 | |
128 #ifndef PRODUCT | |
129 public: | |
130 // Printing support | |
131 void print_on(outputStream* st) const; | |
132 void print_on(outputStream* st, PcDesc* pd) const; | |
133 void print_value_on(outputStream* st) const; | |
134 #endif | |
135 }; | |
1972 | 136 |
137 #endif // SHARE_VM_CODE_SCOPEDESC_HPP |