1 /*
2 * Copyright (c) 1999, 2016, 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_JVMCI_JVMCIENV_HPP
26 #define SHARE_VM_JVMCI_JVMCIENV_HPP
27
28 #include "classfile/systemDictionary.hpp"
29 #include "code/debugInfoRec.hpp"
30 #include "code/dependencies.hpp"
31 #include "code/exceptionHandlerTable.hpp"
32 #include "compiler/oopMap.hpp"
33 #include "runtime/thread.hpp"
34
35 class CompileTask;
36
37 // Bring the JVMCI compiler thread into the VM state.
38 #define JVMCI_VM_ENTRY_MARK \
39 JavaThread* thread = JavaThread::current(); \
40 ThreadInVMfromNative __tiv(thread); \
41 ResetNoHandleMark rnhm; \
42 HandleMarkCleaner __hm(thread); \
43 Thread* THREAD = thread; \
44 debug_only(VMNativeEntryWrapper __vew;)
45
46 #define JVMCI_EXCEPTION_CONTEXT \
47 JavaThread* thread=JavaThread::current(); \
48 Thread* THREAD = thread;
49
50 //
51 // This class is the top level broker for requests from the compiler
52 // to the VM.
53 class JVMCIEnv : StackObj {
54 CI_PACKAGE_ACCESS_TO
55
56 friend class JVMCIVMStructs;
57 friend class CompileBroker;
58 friend class Dependencies; // for get_object, during logging
59
60 public:
61
62 enum CodeInstallResult {
63 ok,
64 dependencies_failed,
65 dependencies_invalid,
66 cache_full,
67 code_too_large
68 };
69
70 // Look up a klass by name from a particular class loader (the accessor's).
71 // If require_local, result must be defined in that class loader, or NULL.
72 // If !require_local, a result from remote class loader may be reported,
73 // if sufficient class loader constraints exist such that initiating
74 // a class loading request from the given loader is bound to return
75 // the class defined in the remote loader (or throw an error).
76 //
77 // Return an unloaded klass if !require_local and no class at all is found.
78 //
79 // The CI treats a klass as loaded if it is consistently defined in
80 // another loader, even if it hasn't yet been loaded in all loaders
81 // that could potentially see it via delegation.
82 static KlassHandle get_klass_by_name(KlassHandle accessing_klass,
83 Symbol* klass_name,
84 bool require_local);
85
86 // Constant pool access.
87 static KlassHandle get_klass_by_index(const constantPoolHandle& cpool,
88 int klass_index,
89 bool& is_accessible,
90 KlassHandle loading_klass);
91 static void get_field_by_index(instanceKlassHandle loading_klass, fieldDescriptor& fd,
92 int field_index);
93 static methodHandle get_method_by_index(const constantPoolHandle& cpool,
94 int method_index, Bytecodes::Code bc,
95 instanceKlassHandle loading_klass);
96
97 JVMCIEnv(CompileTask* task, int system_dictionary_modification_counter);
98
99 private:
100 CompileTask* _task;
101 int _system_dictionary_modification_counter;
102
103 // Cache JVMTI state
104 bool _jvmti_can_hotswap_or_post_breakpoint;
105 bool _jvmti_can_access_local_variables;
106 bool _jvmti_can_post_on_exceptions;
107
108 // Implementation methods for loading and constant pool access.
109 static KlassHandle get_klass_by_name_impl(KlassHandle& accessing_klass,
110 const constantPoolHandle& cpool,
111 Symbol* klass_name,
112 bool require_local);
113 static KlassHandle get_klass_by_index_impl(const constantPoolHandle& cpool,
114 int klass_index,
115 bool& is_accessible,
116 KlassHandle loading_klass);
117 static void get_field_by_index_impl(instanceKlassHandle loading_klass, fieldDescriptor& fd,
118 int field_index);
119 static methodHandle get_method_by_index_impl(const constantPoolHandle& cpool,
120 int method_index, Bytecodes::Code bc,
121 instanceKlassHandle loading_klass);
122
123 // Helper methods
124 static bool check_klass_accessibility(KlassHandle accessing_klass, KlassHandle resolved_klass);
125 static methodHandle lookup_method(instanceKlassHandle accessor,
126 instanceKlassHandle holder,
127 Symbol* name,
128 Symbol* sig,
129 Bytecodes::Code bc,
130 constantTag tag);
131
132 private:
133
134 // Is this thread currently in the VM state?
135 static bool is_in_vm();
136
137 // Helper routine for determining the validity of a compilation
138 // with respect to concurrent class loading.
139 static JVMCIEnv::CodeInstallResult check_for_system_dictionary_modification(Dependencies* target, Handle compiled_code,
140 JVMCIEnv* env, char** failure_detail);
141
142 public:
143 CompileTask* task() { return _task; }
144
145 // Register the result of a compilation.
146 static JVMCIEnv::CodeInstallResult register_method(
147 const methodHandle& target,
148 nmethod*& nm,
149 int entry_bci,
150 CodeOffsets* offsets,
151 int orig_pc_offset,
152 CodeBuffer* code_buffer,
153 int frame_words,
154 OopMapSet* oop_map_set,
155 ExceptionHandlerTable* handler_table,
156 AbstractCompiler* compiler,
157 DebugInformationRecorder* debug_info,
158 Dependencies* dependencies,
159 JVMCIEnv* env,
160 int compile_id,
161 bool has_unsafe_access,
162 bool has_wide_vector,
163 Handle installed_code,
164 Handle compiled_code,
165 Handle speculation_log);
166
167 // converts the Klass* representing the holder of a method into a
168 // InstanceKlass*. This is needed since the holder of a method in
169 // the bytecodes could be an array type. Basically this converts
170 // array types into java/lang/Object and other types stay as they are.
171 static instanceKlassHandle get_instance_klass_for_declared_method_holder(KlassHandle klass);
172 };
173
174 #endif // SHARE_VM_JVMCI_JVMCIENV_HPP