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annotate src/share/vm/code/exceptionHandlerTable.hpp @ 20268:4c1b88a53c74
8046670: Make CMS metadata aware closures applicable for other collectors
Reviewed-by: ehelin, mgerdin
author | stefank |
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date | Tue, 24 Jun 2014 16:20:15 +0200 |
parents | da91efe96a93 |
children | e522a00b91aa |
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0 | 1 /* |
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2 * Copyright (c) 1998, 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_EXCEPTIONHANDLERTABLE_HPP |
26 #define SHARE_VM_CODE_EXCEPTIONHANDLERTABLE_HPP | |
27 | |
28 #include "memory/allocation.hpp" | |
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29 #include "oops/method.hpp" |
1972 | 30 |
0 | 31 // A HandlerTableEntry describes an individual entry of a subtable |
32 // of ExceptionHandlerTable. An entry consists of a pair(bci, pco), | |
33 // where bci is the exception handler bci, and pco is the pc offset | |
34 // relative to the nmethod code start for the compiled exception | |
35 // handler corresponding to the (interpreted) exception handler | |
36 // starting at bci. | |
37 // | |
38 // The first HandlerTableEntry of each subtable holds the length | |
39 // and catch_pco for the subtable (the length is the number of | |
40 // subtable entries w/o header). | |
41 | |
42 class HandlerTableEntry { | |
43 private: | |
44 int _bci; | |
45 int _pco; | |
46 int _scope_depth; | |
47 | |
48 public: | |
49 HandlerTableEntry(int bci, int pco, int scope_depth) { | |
50 assert( 0 <= pco, "pco must be positive"); | |
51 assert( 0 <= scope_depth, "scope_depth must be positive"); | |
52 _bci = bci; | |
53 _pco = pco; | |
54 _scope_depth = scope_depth; | |
55 } | |
56 | |
57 int len() const { return _bci; } // for entry at subtable begin | |
58 int bci() const { return _bci; } | |
59 int pco() const { return _pco; } | |
60 int scope_depth() const { return _scope_depth; } | |
61 }; | |
62 | |
63 | |
64 // An ExceptionHandlerTable is an abstraction over a list of subtables | |
65 // of exception handlers for CatchNodes. Each subtable has a one-entry | |
66 // header holding length and catch_pco of the subtable, followed | |
67 // by 'length' entries for each exception handler that can be reached | |
68 // from the corresponding CatchNode. The catch_pco is the pc offset of | |
69 // the CatchNode in the corresponding nmethod. Empty subtables are dis- | |
70 // carded. | |
71 // | |
72 // Structure of the table: | |
73 // | |
74 // table = { subtable }. | |
75 // subtable = header entry { entry }. | |
76 // header = a pair (number of subtable entries, catch pc offset, [unused]) | |
77 // entry = a pair (handler bci, handler pc offset, scope depth) | |
78 // | |
79 // An ExceptionHandlerTable can be created from scratch, in which case | |
80 // it is possible to add subtables. It can also be created from an | |
81 // nmethod (for lookup purposes) in which case the table cannot be | |
82 // modified. | |
83 | |
84 class nmethod; | |
85 class ExceptionHandlerTable VALUE_OBJ_CLASS_SPEC { | |
86 private: | |
87 HandlerTableEntry* _table; // the table | |
88 int _length; // the current length of the table | |
89 int _size; // the number of allocated entries | |
90 ReallocMark _nesting; // assertion check for reallocations | |
91 | |
92 // add the entry & grow the table if needed | |
93 void add_entry(HandlerTableEntry entry); | |
94 HandlerTableEntry* subtable_for(int catch_pco) const; | |
95 | |
96 public: | |
97 // (compile-time) construction within compiler | |
98 ExceptionHandlerTable(int initial_size = 8); | |
99 | |
100 // (run-time) construction from nmethod | |
101 ExceptionHandlerTable(const nmethod* nm); | |
102 | |
103 // (compile-time) add entries | |
104 void add_subtable( | |
105 int catch_pco, // the pc offset for the CatchNode | |
106 GrowableArray<intptr_t>* handler_bcis, // the exception handler entry point bcis | |
107 GrowableArray<intptr_t>* scope_depths_from_top_scope, | |
108 // if representing exception handlers in multiple | |
109 // inlined scopes, indicates which scope relative to | |
110 // the youngest/innermost one in which we are performing | |
111 // the lookup; zero (or null GrowableArray) indicates | |
112 // innermost scope | |
113 GrowableArray<intptr_t>* handler_pcos // pc offsets for the compiled handlers | |
114 ); | |
115 | |
116 // nmethod support | |
117 int size_in_bytes() const { return round_to(_length * sizeof(HandlerTableEntry), oopSize); } | |
118 void copy_to(nmethod* nm); | |
119 | |
120 // lookup | |
121 HandlerTableEntry* entry_for(int catch_pco, int handler_bci, int scope_depth) const; | |
122 | |
123 // debugging | |
124 void print_subtable(HandlerTableEntry* t) const; | |
125 void print() const; | |
126 void print_subtable_for(int catch_pco) const; | |
127 }; | |
128 | |
129 | |
130 // ---------------------------------------------------------------------------- | |
131 // Implicit null exception tables. Maps an exception PC offset to a | |
132 // continuation PC offset. During construction it's a variable sized | |
133 // array with a max size and current length. When stored inside an | |
134 // nmethod a zero length table takes no space. This is detected by | |
135 // nul_chk_table_size() == 0. Otherwise the table has a length word | |
136 // followed by pairs of <excp-offset, const-offset>. | |
137 | |
138 // Use 32-bit representation for offsets | |
139 typedef uint implicit_null_entry; | |
140 | |
141 class ImplicitExceptionTable VALUE_OBJ_CLASS_SPEC { | |
142 uint _size; | |
143 uint _len; | |
144 implicit_null_entry *_data; | |
145 implicit_null_entry *adr( uint idx ) const { return &_data[2*idx]; } | |
146 ReallocMark _nesting; // assertion check for reallocations | |
147 public: | |
148 ImplicitExceptionTable( ) : _data(0), _size(0), _len(0) { } | |
149 // (run-time) construction from nmethod | |
150 ImplicitExceptionTable( const nmethod *nm ); | |
151 | |
152 void set_size( uint size ); | |
153 void append( uint exec_off, uint cont_off ); | |
154 uint at( uint exec_off ) const; | |
155 | |
156 uint len() const { return _len; } | |
157 int size_in_bytes() const { return len() == 0 ? 0 : ((2 * len() + 1) * sizeof(implicit_null_entry)); } | |
158 | |
159 void copy_to(nmethod* nm); | |
160 void print(address base) const; | |
161 void verify(nmethod *nm) const; | |
162 }; | |
1972 | 163 |
164 #endif // SHARE_VM_CODE_EXCEPTIONHANDLERTABLE_HPP |