Mon, 12 Aug 2019 18:30:40 +0300
8223147: JFR Backport
8199712: Flight Recorder
8203346: JFR: Inconsistent signature of jfr_add_string_constant
8195817: JFR.stop should require name of recording
8195818: JFR.start should increase autogenerated name by one
8195819: Remove recording=x from jcmd JFR.check output
8203921: JFR thread sampling is missing fixes from JDK-8194552
8203929: Limit amount of data for JFR.dump
8203664: JFR start failure after AppCDS archive created with JFR StartFlightRecording
8003209: JFR events for network utilization
8207392: [PPC64] Implement JFR profiling
8202835: jfr/event/os/TestSystemProcess.java fails on missing events
Summary: Backport JFR from JDK11. Initial integration
Reviewed-by: neugens
1 /*
2 * Copyright (c) 1999, 2013, 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 */
25 #ifndef SHARE_VM_CI_CIFIELD_HPP
26 #define SHARE_VM_CI_CIFIELD_HPP
28 #include "ci/ciClassList.hpp"
29 #include "ci/ciConstant.hpp"
30 #include "ci/ciFlags.hpp"
31 #include "ci/ciInstance.hpp"
33 // ciField
34 //
35 // This class represents the result of a field lookup in the VM.
36 // The lookup may not succeed, in which case the information in
37 // the ciField will be incomplete.
38 class ciField : public ResourceObj {
39 CI_PACKAGE_ACCESS
40 friend class ciEnv;
41 friend class ciInstanceKlass;
42 friend class NonStaticFieldFiller;
44 private:
45 ciFlags _flags;
46 ciInstanceKlass* _holder;
47 ciSymbol* _name;
48 ciSymbol* _signature;
49 ciType* _type;
50 int _offset;
51 bool _is_constant;
52 ciInstanceKlass* _known_to_link_with_put;
53 ciInstanceKlass* _known_to_link_with_get;
54 ciConstant _constant_value;
56 ciType* compute_type();
57 ciType* compute_type_impl();
59 ciField(ciInstanceKlass* klass, int index);
60 ciField(fieldDescriptor* fd);
62 // shared constructor code
63 void initialize_from(fieldDescriptor* fd);
65 public:
66 ciFlags flags() { return _flags; }
68 // Of which klass is this field a member?
69 //
70 // Usage note: the declared holder of a field is the class
71 // referenced by name in the bytecodes. The canonical holder
72 // is the most general class which holds the field. This
73 // method returns the canonical holder. The declared holder
74 // can be accessed via a method in ciBytecodeStream.
75 //
76 // Ex.
77 // class A {
78 // public int f = 7;
79 // }
80 // class B extends A {
81 // public void test() {
82 // System.out.println(f);
83 // }
84 // }
85 //
86 // A java compiler is permitted to compile the access to
87 // field f as:
88 //
89 // getfield B.f
90 //
91 // In that case the declared holder of f would be B and
92 // the canonical holder of f would be A.
93 ciInstanceKlass* holder() { return _holder; }
95 // Name of this field?
96 ciSymbol* name() { return _name; }
98 // Signature of this field?
99 ciSymbol* signature() { return _signature; }
101 // Of what type is this field?
102 ciType* type() { return (_type == NULL) ? compute_type() : _type; }
104 // How is this field actually stored in memory?
105 BasicType layout_type() { return type2field[(_type == NULL) ? T_OBJECT : _type->basic_type()]; }
107 // How big is this field in memory?
108 int size_in_bytes() { return type2aelembytes(layout_type()); }
110 // What is the offset of this field?
111 int offset() {
112 assert(_offset >= 1, "illegal call to offset()");
113 return _offset;
114 }
116 // Same question, explicit units. (Fields are aligned to the byte level.)
117 int offset_in_bytes() {
118 return offset();
119 }
121 // Is this field shared?
122 bool is_shared() {
123 // non-static fields of shared holders are cached
124 return _holder->is_shared() && !is_static();
125 }
127 // Is this field a constant? See ciField::initialize_from() for details
128 // about how a field is determined to be constant.
129 bool is_constant() { return _is_constant; }
131 // Get the constant value of this field.
132 ciConstant constant_value() {
133 assert(is_static() && is_constant(), "illegal call to constant_value()");
134 return _constant_value;
135 }
137 // Get the constant value of non-static final field in the given
138 // object.
139 ciConstant constant_value_of(ciObject* object) {
140 assert(!is_static() && is_constant(), "only if field is non-static constant");
141 assert(object->is_instance(), "must be instance");
142 return object->as_instance()->field_value(this);
143 }
145 // Check for link time errors. Accessing a field from a
146 // certain class via a certain bytecode may or may not be legal.
147 // This call checks to see if an exception may be raised by
148 // an access of this field.
149 //
150 // Usage note: if the same field is accessed multiple times
151 // in the same compilation, will_link will need to be checked
152 // at each point of access.
153 bool will_link(ciInstanceKlass* accessing_klass,
154 Bytecodes::Code bc);
156 // Java access flags
157 bool is_public () { return flags().is_public(); }
158 bool is_private () { return flags().is_private(); }
159 bool is_protected () { return flags().is_protected(); }
160 bool is_static () { return flags().is_static(); }
161 bool is_final () { return flags().is_final(); }
162 bool is_stable () { return flags().is_stable(); }
163 bool is_volatile () { return flags().is_volatile(); }
164 bool is_transient () { return flags().is_transient(); }
165 // The field is modified outside of instance initializer methods
166 // (or class/initializer methods if the field is static).
167 bool has_initialized_final_update() { return flags().has_initialized_final_update(); }
169 bool is_call_site_target() {
170 ciInstanceKlass* callsite_klass = CURRENT_ENV->CallSite_klass();
171 if (callsite_klass == NULL)
172 return false;
173 return (holder()->is_subclass_of(callsite_klass) && (name() == ciSymbol::target_name()));
174 }
176 // Debugging output
177 void print();
178 void print_name_on(outputStream* st);
179 };
181 #endif // SHARE_VM_CI_CIFIELD_HPP