1 /* 2 * Copyright 1997-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 20 * CA 95054 USA or visit www.sun.com if you need additional information or 21 * have any questions. 22 * 23 */ 24 25 // SimpleScopeDesc is used when all you need to extract from 26 // a given pc,nmethod pair is a methodOop and a bci. This is 27 // quite a bit faster than allocating a full ScopeDesc, but 28 // very limited in abilities. 29 30 class SimpleScopeDesc : public StackObj { 31 private: 32 methodOop _method; 33 int _bci; 34 35 public: 36 SimpleScopeDesc(nmethod* code,address pc) { 37 PcDesc* pc_desc = code->pc_desc_at(pc); 38 assert(pc_desc != NULL, "Must be able to find matching PcDesc"); 39 DebugInfoReadStream buffer(code, pc_desc->scope_decode_offset()); 40 int ignore_sender = buffer.read_int(); 41 _method = methodOop(buffer.read_oop()); 42 _bci = buffer.read_bci(); 43 } 44 45 methodOop method() { return _method; } 46 int bci() { return _bci; } 47 }; 48 49 // ScopeDescs contain the information that makes source-level debugging of 50 // nmethods possible; each scopeDesc describes a method activation 51 52 class ScopeDesc : public ResourceObj { 53 public: 54 // Constructor 55 ScopeDesc(const nmethod* code, int decode_offset, int obj_decode_offset); 56 57 // Calls above, giving default value of "serialized_null" to the 58 // "obj_decode_offset" argument. (We don't use a default argument to 59 // avoid a .hpp-.hpp dependency.) 60 ScopeDesc(const nmethod* code, int decode_offset); 61 62 // JVM state 63 methodHandle method() const { return _method; } 64 int bci() const { return _bci; } 65 66 GrowableArray<ScopeValue*>* locals(); 67 GrowableArray<ScopeValue*>* expressions(); 68 GrowableArray<MonitorValue*>* monitors(); 69 GrowableArray<ScopeValue*>* objects(); 70 71 // Stack walking, returns NULL if this is the outer most scope. 72 ScopeDesc* sender() const; 73 74 // Returns where the scope was decoded 75 int decode_offset() const { return _decode_offset; } 76 77 // Tells whether sender() returns NULL 78 bool is_top() const; 79 // Tells whether sd is equal to this 80 bool is_equal(ScopeDesc* sd) const; 81 82 private: 83 // Alternative constructor 84 ScopeDesc(const ScopeDesc* parent); 85 86 // JVM state 87 methodHandle _method; 88 int _bci; 89 90 // Decoding offsets 91 int _decode_offset; 92 int _sender_decode_offset; 93 int _locals_decode_offset; 94 int _expressions_decode_offset; 95 int _monitors_decode_offset; 96 97 // Object pool 98 GrowableArray<ScopeValue*>* _objects; 99 100 // Nmethod information 101 const nmethod* _code; 102 103 // Decoding operations 104 void decode_body(); 105 GrowableArray<ScopeValue*>* decode_scope_values(int decode_offset); 106 GrowableArray<MonitorValue*>* decode_monitor_values(int decode_offset); 107 GrowableArray<ScopeValue*>* decode_object_values(int decode_offset); 108 109 DebugInfoReadStream* stream_at(int decode_offset) const; 110 111 112 public: 113 // Verification 114 void verify(); 115 116 #ifndef PRODUCT 117 public: 118 // Printing support 119 void print_on(outputStream* st) const; 120 void print_on(outputStream* st, PcDesc* pd) const; 121 void print_value_on(outputStream* st) const; 122 #endif 123 };