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 // Compilation result values 104 const char* _failure_reason; 105 bool _retryable; 106 107 // Cache JVMTI state 108 bool _jvmti_can_hotswap_or_post_breakpoint; 109 bool _jvmti_can_access_local_variables; 110 bool _jvmti_can_post_on_exceptions; 111 112 // Implementation methods for loading and constant pool access. 113 static KlassHandle get_klass_by_name_impl(KlassHandle& accessing_klass, 114 const constantPoolHandle& cpool, 115 Symbol* klass_name, 116 bool require_local); 117 static KlassHandle get_klass_by_index_impl(const constantPoolHandle& cpool, 118 int klass_index, 119 bool& is_accessible, 120 KlassHandle loading_klass); 121 static void get_field_by_index_impl(instanceKlassHandle loading_klass, fieldDescriptor& fd, 122 int field_index); 123 static methodHandle get_method_by_index_impl(const constantPoolHandle& cpool, 124 int method_index, Bytecodes::Code bc, 125 instanceKlassHandle loading_klass); 126 127 // Helper methods 128 static bool check_klass_accessibility(KlassHandle accessing_klass, KlassHandle resolved_klass); 129 static methodHandle lookup_method(instanceKlassHandle accessor, 130 instanceKlassHandle holder, 131 Symbol* name, 132 Symbol* sig, 133 Bytecodes::Code bc, 134 constantTag tag); 135 136 private: 137 138 // Is this thread currently in the VM state? 139 static bool is_in_vm(); 140 141 // Helper routine for determining the validity of a compilation 142 // with respect to concurrent class loading. 143 static JVMCIEnv::CodeInstallResult check_for_system_dictionary_modification(Dependencies* target, Handle compiled_code, 144 JVMCIEnv* env, char** failure_detail); 145 146 public: 147 CompileTask* task() { return _task; } 148 149 const char* failure_reason() { return _failure_reason; } 150 bool retryable() { return _retryable; } 151 152 void set_failure(const char* reason, bool retryable) { 153 _failure_reason = reason; 154 _retryable = retryable; 155 } 156 157 // Register the result of a compilation. 158 static JVMCIEnv::CodeInstallResult register_method( 159 const methodHandle& target, 160 nmethod*& nm, 161 int entry_bci, 162 CodeOffsets* offsets, 163 int orig_pc_offset, 164 CodeBuffer* code_buffer, 165 int frame_words, 166 OopMapSet* oop_map_set, 167 ExceptionHandlerTable* handler_table, 168 AbstractCompiler* compiler, 169 DebugInformationRecorder* debug_info, 170 Dependencies* dependencies, 171 JVMCIEnv* env, 172 int compile_id, 173 bool has_unsafe_access, 174 bool has_wide_vector, 175 Handle installed_code, 176 Handle compiled_code, 177 Handle speculation_log); 178 179 // converts the Klass* representing the holder of a method into a 180 // InstanceKlass*. This is needed since the holder of a method in 181 // the bytecodes could be an array type. Basically this converts 182 // array types into java/lang/Object and other types stay as they are. 183 static instanceKlassHandle get_instance_klass_for_declared_method_holder(KlassHandle klass); 184 }; 185 186 #endif // SHARE_VM_JVMCI_JVMCIENV_HPP