| File: | jdk/src/hotspot/share/code/scopeDesc.hpp |
| Warning: | line 51, column 9 Value stored to 'ignore_sender' during its initialization is never read |
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| 1 | /* |
| 2 | * Copyright (c) 1997, 2020, 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_CODE_SCOPEDESC_HPP |
| 26 | #define SHARE_CODE_SCOPEDESC_HPP |
| 27 | |
| 28 | #include "code/debugInfo.hpp" |
| 29 | #include "code/pcDesc.hpp" |
| 30 | #include "oops/method.hpp" |
| 31 | #include "utilities/growableArray.hpp" |
| 32 | |
| 33 | // SimpleScopeDesc is used when all you need to extract from |
| 34 | // a given pc,nmethod pair is a Method* and a bci. This is |
| 35 | // quite a bit faster than allocating a full ScopeDesc, but |
| 36 | // very limited in abilities. |
| 37 | |
| 38 | class SimpleScopeDesc : public StackObj { |
| 39 | private: |
| 40 | Method* _method; |
| 41 | int _bci; |
| 42 | bool _is_optimized_linkToNative; |
| 43 | |
| 44 | public: |
| 45 | SimpleScopeDesc(CompiledMethod* code, address pc) { |
| 46 | PcDesc* pc_desc = code->pc_desc_at(pc); |
| 47 | assert(pc_desc != NULL, "Must be able to find matching PcDesc")do { if (!(pc_desc != __null)) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/code/scopeDesc.hpp" , 47, "assert(" "pc_desc != __null" ") failed", "Must be able to find matching PcDesc" ); ::breakpoint(); } } while (0); |
| 48 | // save this here so we only have to look up the PcDesc once |
| 49 | _is_optimized_linkToNative = pc_desc->is_optimized_linkToNative(); |
| 50 | DebugInfoReadStream buffer(code, pc_desc->scope_decode_offset()); |
| 51 | int ignore_sender = buffer.read_int(); |
Value stored to 'ignore_sender' during its initialization is never read | |
| 52 | _method = buffer.read_method(); |
| 53 | _bci = buffer.read_bci(); |
| 54 | } |
| 55 | |
| 56 | Method* method() { return _method; } |
| 57 | int bci() { return _bci; } |
| 58 | bool is_optimized_linkToNative() { return _is_optimized_linkToNative; } |
| 59 | }; |
| 60 | |
| 61 | // ScopeDescs contain the information that makes source-level debugging of |
| 62 | // nmethods possible; each scopeDesc describes a method activation |
| 63 | |
| 64 | class ScopeDesc : public ResourceObj { |
| 65 | public: |
| 66 | // Constructor |
| 67 | ScopeDesc(const CompiledMethod* code, PcDesc* pd, bool ignore_objects = false); |
| 68 | |
| 69 | // Direct access to scope |
| 70 | ScopeDesc* at_offset(int decode_offset) { return new ScopeDesc(this, decode_offset); } |
| 71 | |
| 72 | // JVM state |
| 73 | Method* method() const { return _method; } |
| 74 | int bci() const { return _bci; } |
| 75 | bool should_reexecute() const { return _reexecute; } |
| 76 | bool rethrow_exception() const { return _rethrow_exception; } |
| 77 | bool return_oop() const { return _return_oop; } |
| 78 | // Returns true if one or more NoEscape or ArgEscape objects exist in |
| 79 | // any of the scopes at compiled pc. |
| 80 | bool has_ea_local_in_scope() const { return _has_ea_local_in_scope; } |
| 81 | bool arg_escape() const { return _arg_escape; } |
| 82 | |
| 83 | GrowableArray<ScopeValue*>* locals(); |
| 84 | GrowableArray<ScopeValue*>* expressions(); |
| 85 | GrowableArray<MonitorValue*>* monitors(); |
| 86 | GrowableArray<ScopeValue*>* objects(); |
| 87 | |
| 88 | // Stack walking, returns NULL if this is the outer most scope. |
| 89 | ScopeDesc* sender() const; |
| 90 | |
| 91 | // Returns where the scope was decoded |
| 92 | int decode_offset() const { return _decode_offset; } |
| 93 | |
| 94 | int sender_decode_offset() const { return _sender_decode_offset; } |
| 95 | |
| 96 | // Tells whether sender() returns NULL |
| 97 | bool is_top() const; |
| 98 | |
| 99 | private: |
| 100 | void initialize(const ScopeDesc* parent, int decode_offset); |
| 101 | // Alternative constructors |
| 102 | ScopeDesc(const ScopeDesc* parent); |
| 103 | ScopeDesc(const ScopeDesc* parent, int decode_offset); |
| 104 | |
| 105 | // JVM state |
| 106 | Method* _method; |
| 107 | int _bci; |
| 108 | bool _reexecute; |
| 109 | bool _rethrow_exception; |
| 110 | bool _return_oop; |
| 111 | bool _has_ea_local_in_scope; // One or more NoEscape or ArgEscape objects exist in |
| 112 | // any of the scopes at compiled pc. |
| 113 | bool _arg_escape; // Compiled Java call in youngest scope passes ArgEscape |
| 114 | |
| 115 | // Decoding offsets |
| 116 | int _decode_offset; |
| 117 | int _sender_decode_offset; |
| 118 | int _locals_decode_offset; |
| 119 | int _expressions_decode_offset; |
| 120 | int _monitors_decode_offset; |
| 121 | |
| 122 | // Object pool |
| 123 | GrowableArray<ScopeValue*>* _objects; |
| 124 | |
| 125 | // Nmethod information |
| 126 | const CompiledMethod* _code; |
| 127 | |
| 128 | // Decoding operations |
| 129 | void decode_body(); |
| 130 | GrowableArray<ScopeValue*>* decode_scope_values(int decode_offset); |
| 131 | GrowableArray<MonitorValue*>* decode_monitor_values(int decode_offset); |
| 132 | GrowableArray<ScopeValue*>* decode_object_values(int decode_offset); |
| 133 | |
| 134 | DebugInfoReadStream* stream_at(int decode_offset) const; |
| 135 | |
| 136 | |
| 137 | public: |
| 138 | // Verification |
| 139 | void verify(); |
| 140 | |
| 141 | #ifndef PRODUCT |
| 142 | public: |
| 143 | // Printing support |
| 144 | void print_on(outputStream* st) const; |
| 145 | void print_on(outputStream* st, PcDesc* pd) const; |
| 146 | void print_value_on(outputStream* st) const; |
| 147 | #endif |
| 148 | }; |
| 149 | |
| 150 | #endif // SHARE_CODE_SCOPEDESC_HPP |