1 /*
2 * Copyright (c) 1999, 2015, 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 CompileBroker;
57 friend class Dependencies; // for get_object, during logging
58
59 public:
60
61 enum CodeInstallResult {
62 ok,
63 dependencies_failed,
64 dependencies_invalid,
65 cache_full,
66 code_too_large
67 };
68
69 // Look up a klass by name from a particular class loader (the accessor's).
70 // If require_local, result must be defined in that class loader, or NULL.
71 // If !require_local, a result from remote class loader may be reported,
72 // if sufficient class loader constraints exist such that initiating
73 // a class loading request from the given loader is bound to return
74 // the class defined in the remote loader (or throw an error).
75 //
76 // Return an unloaded klass if !require_local and no class at all is found.
77 //
78 // The CI treats a klass as loaded if it is consistently defined in
79 // another loader, even if it hasn't yet been loaded in all loaders
80 // that could potentially see it via delegation.
81 static KlassHandle get_klass_by_name(KlassHandle& accessing_klass,
82 Symbol* klass_name,
83 bool require_local);
84
85 // Constant pool access.
86 static KlassHandle get_klass_by_index(const constantPoolHandle& cpool,
87 int klass_index,
88 bool& is_accessible,
89 KlassHandle& loading_klass);
90 static void get_field_by_index(instanceKlassHandle& loading_klass, fieldDescriptor& fd,
91 int field_index);
92 static methodHandle get_method_by_index(const constantPoolHandle& cpool,
93 int method_index, Bytecodes::Code bc,
94 instanceKlassHandle& loading_klass);
95
96 JVMCIEnv(CompileTask* task, int system_dictionary_modification_counter);
97
98 private:
99 CompileTask* _task;
100 int _system_dictionary_modification_counter;
101
102 // Cache JVMTI state
103 bool _jvmti_can_hotswap_or_post_breakpoint;
104 bool _jvmti_can_access_local_variables;
105 bool _jvmti_can_post_on_exceptions;
106
107 // Implementation methods for loading and constant pool access.
108 static KlassHandle get_klass_by_name_impl(KlassHandle& accessing_klass,
109 const constantPoolHandle& cpool,
110 Symbol* klass_name,
111 bool require_local);
112 static KlassHandle get_klass_by_index_impl(const constantPoolHandle& cpool,
113 int klass_index,
114 bool& is_accessible,
115 KlassHandle& loading_klass);
116 static void get_field_by_index_impl(instanceKlassHandle& loading_klass, fieldDescriptor& fd,
117 int field_index);
118 static methodHandle get_method_by_index_impl(const constantPoolHandle& cpool,
119 int method_index, Bytecodes::Code bc,
120 instanceKlassHandle& loading_klass);
121
122 // Helper methods
123 static bool check_klass_accessibility(KlassHandle accessing_klass, KlassHandle resolved_klass);
124 static methodHandle lookup_method(instanceKlassHandle& accessor,
125 instanceKlassHandle& holder,
126 Symbol* name,
127 Symbol* sig,
128 Bytecodes::Code bc,
129 constantTag tag);
130
131 private:
132
133 // Is this thread currently in the VM state?
134 static bool is_in_vm();
135
136 // Helper routine for determining the validity of a compilation
137 // with respect to concurrent class loading.
138 static JVMCIEnv::CodeInstallResult check_for_system_dictionary_modification(Dependencies* target, Handle compiled_code,
139 JVMCIEnv* env, char** failure_detail);
140
141 public:
142 CompileTask* task() { return _task; }
143
144 // Register the result of a compilation.
145 static JVMCIEnv::CodeInstallResult register_method(
146 methodHandle& target,
147 nmethod*& nm,
148 int entry_bci,
149 CodeOffsets* offsets,
150 int orig_pc_offset,
151 CodeBuffer* code_buffer,
152 int frame_words,
153 OopMapSet* oop_map_set,
154 ExceptionHandlerTable* handler_table,
155 AbstractCompiler* compiler,
156 DebugInformationRecorder* debug_info,
157 Dependencies* dependencies,
158 JVMCIEnv* env,
159 int compile_id,
160 bool has_unsafe_access,
161 bool has_wide_vector,
162 Handle installed_code,
163 Handle compiled_code,
164 Handle speculation_log);
165
166 // converts the Klass* representing the holder of a method into a
167 // InstanceKlass*. This is needed since the holder of a method in
168 // the bytecodes could be an array type. Basically this converts
169 // array types into java/lang/Object and other types stay as they are.
170 static instanceKlassHandle get_instance_klass_for_declared_method_holder(KlassHandle& klass);
171 };
172
173 #endif // SHARE_VM_JVMCI_JVMCIENV_HPP