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1 /*
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2 * Copyright 2006 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25
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26 class ciBlock;
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27
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28 typedef short ciBlockIndex;
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29
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30 class ciMethodBlocks : public ResourceObj {
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31 private:
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32 ciMethod *_method;
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33 Arena *_arena;
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34 GrowableArray<ciBlock *> *_blocks;
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35 ciBlock **_bci_to_block;
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36 int _num_blocks;
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37 int _code_size;
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38
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39 void do_analysis();
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40 public:
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41 ciMethodBlocks(Arena *arena, ciMethod *meth);
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42
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43 ciBlock *block_containing(int bci);
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44 ciBlock *block(int index) { return _blocks->at(index); }
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45 ciBlock *make_block_at(int bci);
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46 ciBlock *split_block_at(int bci);
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47 bool is_block_start(int bci);
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48 int num_blocks() { return _num_blocks;}
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49 void clear_processed();
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50
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51 #ifndef PRODUCT
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52 void dump();
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53 #endif
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54 };
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55
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56 class ciBlock : public ResourceObj {
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57 private:
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58 int _idx;
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59 int _start_bci;
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60 int _limit_bci;
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61 int _control_bci;
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62 uint _flags;
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63 int _ex_start_bci;
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64 int _ex_limit_bci;
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65 #ifndef PRODUCT
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66 ciMethod *_method;
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67 #endif
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68 enum {
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69 Processed = (1 << 0),
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70 Handler = (1 << 1),
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71 MayThrow = (1 << 2),
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72 DoesJsr = (1 << 3),
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73 DoesRet = (1 << 4),
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74 RetTarget = (1 << 5),
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75 HasHandler = (1 << 6)
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76 };
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77
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78
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79 public:
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80 enum {
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81 fall_through_bci = -1
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82 };
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83
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84 ciBlock(ciMethod *method, int index, ciMethodBlocks *mb, int start_bci);
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85 int start_bci() const { return _start_bci; }
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86 int limit_bci() const { return _limit_bci; }
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87 int control_bci() const { return _control_bci; }
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88 int index() const { return _idx; }
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89 void set_start_bci(int bci) { _start_bci = bci; }
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90 void set_limit_bci(int bci) { _limit_bci = bci; }
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91 void set_control_bci(int bci) { _control_bci = bci;}
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92 void set_exception_range(int start_bci, int limit_bci);
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93 int ex_start_bci() const { return _ex_start_bci; }
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94 int ex_limit_bci() const { return _ex_limit_bci; }
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95 bool contains(int bci) const { return start_bci() <= bci && bci < limit_bci(); }
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96
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97
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98 // flag handling
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99 bool processed() const { return (_flags & Processed) != 0; }
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100 bool is_handler() const { return (_flags & Handler) != 0; }
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101 bool may_throw() const { return (_flags & MayThrow) != 0; }
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102 bool does_jsr() const { return (_flags & DoesJsr) != 0; }
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103 bool does_ret() const { return (_flags & DoesRet) != 0; }
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104 bool has_handler() const { return (_flags & HasHandler) != 0; }
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105 bool is_ret_target() const { return (_flags & RetTarget) != 0; }
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106 void set_processed() { _flags |= Processed; }
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107 void clear_processed() { _flags &= ~Processed; }
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108 void set_handler() { _flags |= Handler; }
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109 void set_may_throw() { _flags |= MayThrow; }
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110 void set_does_jsr() { _flags |= DoesJsr; }
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111 void clear_does_jsr() { _flags &= ~DoesJsr; }
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112 void set_does_ret() { _flags |= DoesRet; }
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113 void clear_does_ret() { _flags |= DoesRet; }
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114 void set_is_ret_target() { _flags |= RetTarget; }
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115 void set_has_handler() { _flags |= HasHandler; }
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116 #ifndef PRODUCT
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117 ciMethod *method() const { return _method; }
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118 void dump();
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119 void print_on(outputStream* st) const PRODUCT_RETURN;
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120 #endif
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121 };
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