1 /*
2 * Copyright (c) 2006, 2008, 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
26 class ciBlock;
27
28 typedef short ciBlockIndex;
29
30 class ciMethodBlocks : public ResourceObj {
31 private:
32 ciMethod *_method;
33 Arena *_arena;
34 GrowableArray<ciBlock *> *_blocks;
35 ciBlock **_bci_to_block;
36 int _num_blocks;
37 int _code_size;
38
39 void do_analysis();
40 public:
41 ciMethodBlocks(Arena *arena, ciMethod *meth);
42
43 ciBlock *block_containing(int bci);
44 ciBlock *block(int index) { return _blocks->at(index); }
45 ciBlock *make_block_at(int bci);
46 ciBlock *split_block_at(int bci);
47 bool is_block_start(int bci);
48 int num_blocks() { return _num_blocks;}
49 void clear_processed();
50
51 ciBlock *make_dummy_block(); // a block not associated with a bci
52
53 #ifndef PRODUCT
54 void dump();
55 #endif
56 };
57
58 class ciBlock : public ResourceObj {
59 private:
60 int _idx;
61 int _start_bci;
62 int _limit_bci;
63 int _control_bci;
64 uint _flags;
65 int _ex_start_bci;
66 int _ex_limit_bci;
67 #ifndef PRODUCT
68 ciMethod *_method;
69 #endif
70 enum {
71 Processed = (1 << 0),
72 Handler = (1 << 1),
73 MayThrow = (1 << 2),
74 DoesJsr = (1 << 3),
75 DoesRet = (1 << 4),
76 RetTarget = (1 << 5),
77 HasHandler = (1 << 6)
78 };
79
80
81 public:
82 enum {
83 fall_through_bci = -1
84 };
85
86 ciBlock(ciMethod *method, int index, int start_bci);
87 int start_bci() const { return _start_bci; }
88 int limit_bci() const { return _limit_bci; }
89 int control_bci() const { return _control_bci; }
90 int index() const { return _idx; }
91 void set_start_bci(int bci) { _start_bci = bci; }
92 void set_limit_bci(int bci) { _limit_bci = bci; }
93 void set_control_bci(int bci) { _control_bci = bci;}
94 void set_exception_range(int start_bci, int limit_bci);
95 int ex_start_bci() const { return _ex_start_bci; }
96 int ex_limit_bci() const { return _ex_limit_bci; }
97 bool contains(int bci) const { return start_bci() <= bci && bci < limit_bci(); }
98
99 // flag handling
100 bool processed() const { return (_flags & Processed) != 0; }
101 bool is_handler() const { return (_flags & Handler) != 0; }
102 bool may_throw() const { return (_flags & MayThrow) != 0; }
103 bool does_jsr() const { return (_flags & DoesJsr) != 0; }
104 bool does_ret() const { return (_flags & DoesRet) != 0; }
105 bool has_handler() const { return (_flags & HasHandler) != 0; }
106 bool is_ret_target() const { return (_flags & RetTarget) != 0; }
107 void set_processed() { _flags |= Processed; }
108 void clear_processed() { _flags &= ~Processed; }
109 void set_handler() { _flags |= Handler; }
110 void set_may_throw() { _flags |= MayThrow; }
111 void set_does_jsr() { _flags |= DoesJsr; }
112 void clear_does_jsr() { _flags &= ~DoesJsr; }
113 void set_does_ret() { _flags |= DoesRet; }
114 void clear_does_ret() { _flags &= ~DoesRet; }
115 void set_is_ret_target() { _flags |= RetTarget; }
116 void set_has_handler() { _flags |= HasHandler; }
117 void clear_exception_handler() { _flags &= ~Handler; _ex_start_bci = -1; _ex_limit_bci = -1; }
118 #ifndef PRODUCT
119 ciMethod *method() const { return _method; }
120 void dump();
121 void print_on(outputStream* st) const PRODUCT_RETURN;
122 #endif
123 };