1 /*
2 * Copyright (c) 2006, 2010, Oracle and/or its affiliates. All rights reserved.
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 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_CI_CIMETHODBLOCKS_HPP
26 #define SHARE_VM_CI_CIMETHODBLOCKS_HPP
27
28 #include "ci/ciMethod.hpp"
29 #include "memory/resourceArea.hpp"
30 #include "utilities/growableArray.hpp"
31
32
33 class ciBlock;
34
35 typedef short ciBlockIndex;
36
37 class ciMethodBlocks : public ResourceObj {
38 private:
39 ciMethod *_method;
40 Arena *_arena;
41 GrowableArray<ciBlock *> *_blocks;
42 ciBlock **_bci_to_block;
43 int _num_blocks;
44 int _code_size;
45
46 void do_analysis();
47 public:
48 ciMethodBlocks(Arena *arena, ciMethod *meth);
49
50 ciBlock *block_containing(int bci);
51 ciBlock *block(int index) { return _blocks->at(index); }
52 ciBlock *make_block_at(int bci);
53 ciBlock *split_block_at(int bci);
54 bool is_block_start(int bci);
55 int num_blocks() { return _num_blocks;}
56 void clear_processed();
57
58 ciBlock *make_dummy_block(); // a block not associated with a bci
59
60 #ifndef PRODUCT
61 void dump();
62 #endif
63 };
64
65 class ciBlock : public ResourceObj {
66 private:
67 int _idx;
68 int _start_bci;
69 int _limit_bci;
70 int _control_bci;
71 uint _flags;
72 int _ex_start_bci;
73 int _ex_limit_bci;
74 #ifndef PRODUCT
75 ciMethod *_method;
76 #endif
77 enum {
78 Processed = (1 << 0),
79 Handler = (1 << 1),
80 MayThrow = (1 << 2),
81 DoesJsr = (1 << 3),
82 DoesRet = (1 << 4),
83 RetTarget = (1 << 5),
84 HasHandler = (1 << 6)
85 };
86
87
88 public:
89 enum {
90 fall_through_bci = -1
91 };
92
93 ciBlock(ciMethod *method, int index, int start_bci);
94 int start_bci() const { return _start_bci; }
95 int limit_bci() const { return _limit_bci; }
96 int control_bci() const { return _control_bci; }
97 int index() const { return _idx; }
98 void set_start_bci(int bci) { _start_bci = bci; }
99 void set_limit_bci(int bci) { _limit_bci = bci; }
100 void set_control_bci(int bci) { _control_bci = bci;}
101 void set_exception_range(int start_bci, int limit_bci);
102 int ex_start_bci() const { return _ex_start_bci; }
103 int ex_limit_bci() const { return _ex_limit_bci; }
104 bool contains(int bci) const { return start_bci() <= bci && bci < limit_bci(); }
105
106 // flag handling
107 bool processed() const { return (_flags & Processed) != 0; }
108 bool is_handler() const { return (_flags & Handler) != 0; }
109 bool may_throw() const { return (_flags & MayThrow) != 0; }
110 bool does_jsr() const { return (_flags & DoesJsr) != 0; }
111 bool does_ret() const { return (_flags & DoesRet) != 0; }
112 bool has_handler() const { return (_flags & HasHandler) != 0; }
113 bool is_ret_target() const { return (_flags & RetTarget) != 0; }
114 void set_processed() { _flags |= Processed; }
115 void clear_processed() { _flags &= ~Processed; }
116 void set_handler() { _flags |= Handler; }
117 void set_may_throw() { _flags |= MayThrow; }
118 void set_does_jsr() { _flags |= DoesJsr; }
119 void clear_does_jsr() { _flags &= ~DoesJsr; }
120 void set_does_ret() { _flags |= DoesRet; }
121 void clear_does_ret() { _flags &= ~DoesRet; }
122 void set_is_ret_target() { _flags |= RetTarget; }
123 void set_has_handler() { _flags |= HasHandler; }
124 void clear_exception_handler() { _flags &= ~Handler; _ex_start_bci = -1; _ex_limit_bci = -1; }
125 #ifndef PRODUCT
126 ciMethod *method() const { return _method; }
127 void dump();
128 void print_on(outputStream* st) const PRODUCT_RETURN;
129 #endif
130 };
131
132 #endif // SHARE_VM_CI_CIMETHODBLOCKS_HPP