1 /* 2 * Copyright (c) 1999, 2010, 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 class ciMethodBlocks; 26 class MethodLiveness; 27 class BitMap; 28 class Arena; 29 class BCEscapeAnalyzer; 30 31 32 // ciMethod 33 // 34 // This class represents a methodOop in the HotSpot virtual 35 // machine. 36 class ciMethod : public ciObject { 37 friend class CompileBroker; 38 CI_PACKAGE_ACCESS 39 friend class ciEnv; 40 friend class ciExceptionHandlerStream; 41 friend class ciBytecodeStream; 42 friend class ciMethodHandle; 43 44 private: 45 // General method information. 46 ciFlags _flags; 47 ciSymbol* _name; 48 ciInstanceKlass* _holder; 49 ciSignature* _signature; 50 ciMethodData* _method_data; 51 BCEscapeAnalyzer* _bcea; 52 ciMethodBlocks* _method_blocks; 53 54 // Code attributes. 55 int _code_size; 56 int _max_stack; 57 int _max_locals; 58 vmIntrinsics::ID _intrinsic_id; 59 int _handler_count; 60 int _interpreter_invocation_count; 61 int _interpreter_throwout_count; 62 63 bool _uses_monitors; 64 bool _balanced_monitors; 65 bool _is_compilable; 66 bool _can_be_statically_bound; 67 68 // Lazy fields, filled in on demand 69 address _code; 70 ciExceptionHandler** _exception_handlers; 71 72 // Optional liveness analyzer. 73 MethodLiveness* _liveness; 74 #if defined(COMPILER2) || defined(SHARK) 75 ciTypeFlow* _flow; 76 #endif 77 78 ciMethod(methodHandle h_m); 79 ciMethod(ciInstanceKlass* holder, ciSymbol* name, ciSymbol* signature); 80 81 methodOop get_methodOop() const { 82 methodOop m = (methodOop)get_oop(); 83 assert(m != NULL, "illegal use of unloaded method"); 84 return m; 85 } 86 87 oop loader() const { return _holder->loader(); } 88 89 const char* type_string() { return "ciMethod"; } 90 91 void print_impl(outputStream* st); 92 93 void load_code(); 94 95 void check_is_loaded() const { assert(is_loaded(), "not loaded"); } 96 97 void build_method_data(methodHandle h_m); 98 99 void code_at_put(int bci, Bytecodes::Code code) { 100 Bytecodes::check(code); 101 assert(0 <= bci && bci < code_size(), "valid bci"); 102 address bcp = _code + bci; 103 *bcp = code; 104 } 105 106 public: 107 // Basic method information. 108 ciFlags flags() const { check_is_loaded(); return _flags; } 109 ciSymbol* name() const { return _name; } 110 ciInstanceKlass* holder() const { return _holder; } 111 ciMethodData* method_data(); 112 113 // Signature information. 114 ciSignature* signature() const { return _signature; } 115 ciType* return_type() const { return _signature->return_type(); } 116 int arg_size_no_receiver() const { return _signature->size(); } 117 int arg_size() const { return _signature->size() + (_flags.is_static() ? 0 : 1); } 118 119 // Method code and related information. 120 address code() { if (_code == NULL) load_code(); return _code; } 121 int code_size() const { check_is_loaded(); return _code_size; } 122 int max_stack() const { check_is_loaded(); return _max_stack; } 123 int max_locals() const { check_is_loaded(); return _max_locals; } 124 vmIntrinsics::ID intrinsic_id() const { check_is_loaded(); return _intrinsic_id; } 125 bool has_exception_handlers() const { check_is_loaded(); return _handler_count > 0; } 126 int exception_table_length() const { check_is_loaded(); return _handler_count; } 127 int interpreter_invocation_count() const { check_is_loaded(); return _interpreter_invocation_count; } 128 int interpreter_throwout_count() const { check_is_loaded(); return _interpreter_throwout_count; } 129 130 Bytecodes::Code java_code_at_bci(int bci) { 131 address bcp = code() + bci; 132 return Bytecodes::java_code_at(bcp); 133 } 134 BCEscapeAnalyzer *get_bcea(); 135 ciMethodBlocks *get_method_blocks(); 136 137 bool has_linenumber_table() const; // length unknown until decompression 138 u_char* compressed_linenumber_table() const; // not preserved by gc 139 140 int line_number_from_bci(int bci) const; 141 142 // Runtime information. 143 int vtable_index(); 144 #ifdef SHARK 145 int itable_index(); 146 #endif // SHARK 147 address native_entry(); 148 address interpreter_entry(); 149 150 // Analysis and profiling. 151 // 152 // Usage note: liveness_at_bci and init_vars should be wrapped in ResourceMarks. 153 bool uses_monitors() const { return _uses_monitors; } // this one should go away, it has a misleading name 154 bool has_monitor_bytecodes() const { return _uses_monitors; } 155 bool has_balanced_monitors(); 156 157 // Returns a bitmap indicating which locals are required to be 158 // maintained as live for deopt. raw_liveness_at_bci is always the 159 // direct output of the liveness computation while liveness_at_bci 160 // may mark all locals as live to improve support for debugging Java 161 // code by maintaining the state of as many locals as possible. 162 MethodLivenessResult raw_liveness_at_bci(int bci); 163 MethodLivenessResult liveness_at_bci(int bci); 164 165 // Get the interpreters viewpoint on oop liveness. MethodLiveness is 166 // conservative in the sense that it may consider locals to be live which 167 // cannot be live, like in the case where a local could contain an oop or 168 // a primitive along different paths. In that case the local must be 169 // dead when those paths merge. Since the interpreter's viewpoint is 170 // used when gc'ing an interpreter frame we need to use its viewpoint 171 // during OSR when loading the locals. 172 173 BitMap live_local_oops_at_bci(int bci); 174 175 #ifdef COMPILER1 176 const BitMap bci_block_start(); 177 #endif 178 179 ciTypeFlow* get_flow_analysis(); 180 ciTypeFlow* get_osr_flow_analysis(int osr_bci); // alternate entry point 181 ciCallProfile call_profile_at_bci(int bci); 182 int interpreter_call_site_count(int bci); 183 184 // Given a certain calling environment, find the monomorphic target 185 // for the call. Return NULL if the call is not monomorphic in 186 // its calling environment. 187 ciMethod* find_monomorphic_target(ciInstanceKlass* caller, 188 ciInstanceKlass* callee_holder, 189 ciInstanceKlass* actual_receiver); 190 191 // Given a known receiver klass, find the target for the call. 192 // Return NULL if the call has no target or is abstract. 193 ciMethod* resolve_invoke(ciKlass* caller, ciKlass* exact_receiver); 194 195 // Find the proper vtable index to invoke this method. 196 int resolve_vtable_index(ciKlass* caller, ciKlass* receiver); 197 198 // Compilation directives 199 bool will_link(ciKlass* accessing_klass, 200 ciKlass* declared_method_holder, 201 Bytecodes::Code bc); 202 bool should_exclude(); 203 bool should_inline(); 204 bool should_not_inline(); 205 bool should_print_assembly(); 206 bool break_at_execute(); 207 bool has_option(const char *option); 208 bool can_be_compiled(); 209 bool can_be_osr_compiled(int entry_bci); 210 void set_not_compilable(); 211 bool has_compiled_code(); 212 int instructions_size(); 213 void log_nmethod_identity(xmlStream* log); 214 bool is_not_reached(int bci); 215 bool was_executed_more_than(int times); 216 bool has_unloaded_classes_in_signature(); 217 bool is_klass_loaded(int refinfo_index, bool must_be_resolved) const; 218 bool check_call(int refinfo_index, bool is_static) const; 219 void build_method_data(); // make sure it exists in the VM also 220 int scale_count(int count, float prof_factor = 1.); // make MDO count commensurate with IIC 221 222 // JSR 292 support 223 bool is_method_handle_invoke() const; 224 bool is_method_handle_adapter() const; 225 ciInstance* method_handle_type(); 226 227 // What kind of ciObject is this? 228 bool is_method() { return true; } 229 230 // Java access flags 231 bool is_public () const { return flags().is_public(); } 232 bool is_private () const { return flags().is_private(); } 233 bool is_protected () const { return flags().is_protected(); } 234 bool is_static () const { return flags().is_static(); } 235 bool is_final () const { return flags().is_final(); } 236 bool is_synchronized() const { return flags().is_synchronized(); } 237 bool is_native () const { return flags().is_native(); } 238 bool is_interface () const { return flags().is_interface(); } 239 bool is_abstract () const { return flags().is_abstract(); } 240 bool is_strict () const { return flags().is_strict(); } 241 242 // Other flags 243 bool is_empty_method() const; 244 bool is_vanilla_constructor() const; 245 bool is_final_method() const { return is_final() || holder()->is_final(); } 246 bool has_loops () const; 247 bool has_jsrs () const; 248 bool is_accessor () const; 249 bool is_initializer () const; 250 bool can_be_statically_bound() const { return _can_be_statically_bound; } 251 252 // Print the bytecodes of this method. 253 void print_codes_on(outputStream* st); 254 void print_codes() { 255 print_codes_on(tty); 256 } 257 void print_codes_on(int from, int to, outputStream* st); 258 259 // Print the name of this method in various incarnations. 260 void print_name(outputStream* st = tty); 261 void print_short_name(outputStream* st = tty); 262 263 methodOop get_method_handle_target() { 264 klassOop receiver_limit_oop = NULL; 265 int flags = 0; 266 return MethodHandles::decode_method(get_oop(), receiver_limit_oop, flags); 267 } 268 };