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); block(int index)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); num_blocks()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); start_bci() const94 int start_bci() const { return _start_bci; } limit_bci() const95 int limit_bci() const { return _limit_bci; } control_bci() const96 int control_bci() const { return _control_bci; } index() const97 int index() const { return _idx; } set_start_bci(int bci)98 void set_start_bci(int bci) { _start_bci = bci; } set_limit_bci(int bci)99 void set_limit_bci(int bci) { _limit_bci = bci; } set_control_bci(int bci)100 void set_control_bci(int bci) { _control_bci = bci;} 101 void set_exception_range(int start_bci, int limit_bci); ex_start_bci() const102 int ex_start_bci() const { return _ex_start_bci; } ex_limit_bci() const103 int ex_limit_bci() const { return _ex_limit_bci; } contains(int bci) const104 bool contains(int bci) const { return start_bci() <= bci && bci < limit_bci(); } 105 106 // flag handling processed() const107 bool processed() const { return (_flags & Processed) != 0; } is_handler() const108 bool is_handler() const { return (_flags & Handler) != 0; } may_throw() const109 bool may_throw() const { return (_flags & MayThrow) != 0; } does_jsr() const110 bool does_jsr() const { return (_flags & DoesJsr) != 0; } does_ret() const111 bool does_ret() const { return (_flags & DoesRet) != 0; } has_handler() const112 bool has_handler() const { return (_flags & HasHandler) != 0; } is_ret_target() const113 bool is_ret_target() const { return (_flags & RetTarget) != 0; } set_processed()114 void set_processed() { _flags |= Processed; } clear_processed()115 void clear_processed() { _flags &= ~Processed; } set_handler()116 void set_handler() { _flags |= Handler; } set_may_throw()117 void set_may_throw() { _flags |= MayThrow; } set_does_jsr()118 void set_does_jsr() { _flags |= DoesJsr; } clear_does_jsr()119 void clear_does_jsr() { _flags &= ~DoesJsr; } set_does_ret()120 void set_does_ret() { _flags |= DoesRet; } clear_does_ret()121 void clear_does_ret() { _flags &= ~DoesRet; } set_is_ret_target()122 void set_is_ret_target() { _flags |= RetTarget; } set_has_handler()123 void set_has_handler() { _flags |= HasHandler; } clear_exception_handler()124 void clear_exception_handler() { _flags &= ~Handler; _ex_start_bci = -1; _ex_limit_bci = -1; } 125 #ifndef PRODUCT method() const126 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 133