1 /* 2 * Copyright 1999-2009 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 20 * CA 95054 USA or visit www.sun.com if you need additional information or 21 * have any 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 42 private: 43 // General method information. 44 ciFlags _flags; 45 ciSymbol* _name; 46 ciInstanceKlass* _holder; 47 ciSignature* _signature; 48 ciMethodData* _method_data; 49 BCEscapeAnalyzer* _bcea; 50 ciMethodBlocks* _method_blocks; 51 52 // Code attributes. 53 int _code_size; 54 int _max_stack; 55 int _max_locals; 56 vmIntrinsics::ID _intrinsic_id; 57 int _handler_count; 58 int _interpreter_invocation_count; 59 int _interpreter_throwout_count; 60 61 bool _uses_monitors; 62 bool _balanced_monitors; 63 bool _is_compilable; 64 bool _can_be_statically_bound; 65 66 // Lazy fields, filled in on demand 67 address _code; 68 ciExceptionHandler** _exception_handlers; 69 70 // Optional liveness analyzer. 71 MethodLiveness* _liveness; 72 #ifdef COMPILER2 73 ciTypeFlow* _flow; 74 #endif 75 76 ciMethod(methodHandle h_m); 77 ciMethod(ciInstanceKlass* holder, ciSymbol* name, ciSymbol* signature); 78 79 methodOop get_methodOop() const { 80 methodOop m = (methodOop)get_oop(); 81 assert(m != NULL, "illegal use of unloaded method"); 82 return m; 83 } 84 85 oop loader() const { return _holder->loader(); } 86 87 const char* type_string() { return "ciMethod"; } 88 89 void print_impl(outputStream* st); 90 91 void load_code(); 92 93 void check_is_loaded() const { assert(is_loaded(), "not loaded"); } 94 95 void build_method_data(methodHandle h_m); 96 97 void code_at_put(int bci, Bytecodes::Code code) { 98 Bytecodes::check(code); 99 assert(0 <= bci && bci < code_size(), "valid bci"); 100 address bcp = _code + bci; 101 *bcp = code; 102 } 103 104 public: 105 // Basic method information. 106 ciFlags flags() const { check_is_loaded(); return _flags; } 107 ciSymbol* name() const { return _name; } 108 ciInstanceKlass* holder() const { return _holder; } 109 ciMethodData* method_data(); 110 111 // Signature information. 112 ciSignature* signature() const { return _signature; } 113 ciType* return_type() const { return _signature->return_type(); } 114 int arg_size_no_receiver() const { return _signature->size(); } 115 int arg_size() const { return _signature->size() + (_flags.is_static() ? 0 : 1); } 116 117 // Method code and related information. 118 address code() { if (_code == NULL) load_code(); return _code; } 119 int code_size() const { check_is_loaded(); return _code_size; } 120 int max_stack() const { check_is_loaded(); return _max_stack; } 121 int max_locals() const { check_is_loaded(); return _max_locals; } 122 vmIntrinsics::ID intrinsic_id() const { check_is_loaded(); return _intrinsic_id; } 123 bool has_exception_handlers() const { check_is_loaded(); return _handler_count > 0; } 124 int exception_table_length() const { check_is_loaded(); return _handler_count; } 125 int interpreter_invocation_count() const { check_is_loaded(); return _interpreter_invocation_count; } 126 int interpreter_throwout_count() const { check_is_loaded(); return _interpreter_throwout_count; } 127 128 Bytecodes::Code java_code_at_bci(int bci) { 129 address bcp = code() + bci; 130 return Bytecodes::java_code_at(bcp); 131 } 132 BCEscapeAnalyzer *get_bcea(); 133 ciMethodBlocks *get_method_blocks(); 134 135 bool has_linenumber_table() const; // length unknown until decompression 136 u_char* compressed_linenumber_table() const; // not preserved by gc 137 138 int line_number_from_bci(int bci) const; 139 140 // Runtime information. 141 int vtable_index(); 142 address native_entry(); 143 address interpreter_entry(); 144 145 // Analysis and profiling. 146 // 147 // Usage note: liveness_at_bci and init_vars should be wrapped in ResourceMarks. 148 bool uses_monitors() const { return _uses_monitors; } // this one should go away, it has a misleading name 149 bool has_monitor_bytecodes() const { return _uses_monitors; } 150 bool has_balanced_monitors(); 151 152 // Returns a bitmap indicating which locals are required to be 153 // maintained as live for deopt. raw_liveness_at_bci is always the 154 // direct output of the liveness computation while liveness_at_bci 155 // may mark all locals as live to improve support for debugging Java 156 // code by maintaining the state of as many locals as possible. 157 MethodLivenessResult raw_liveness_at_bci(int bci); 158 MethodLivenessResult liveness_at_bci(int bci); 159 160 // Get the interpreters viewpoint on oop liveness. MethodLiveness is 161 // conservative in the sense that it may consider locals to be live which 162 // cannot be live, like in the case where a local could contain an oop or 163 // a primitive along different paths. In that case the local must be 164 // dead when those paths merge. Since the interpreter's viewpoint is 165 // used when gc'ing an interpreter frame we need to use its viewpoint 166 // during OSR when loading the locals. 167 168 BitMap live_local_oops_at_bci(int bci); 169 170 #ifdef COMPILER1 171 const BitMap bci_block_start(); 172 #endif 173 174 ciTypeFlow* get_flow_analysis(); 175 ciTypeFlow* get_osr_flow_analysis(int osr_bci); // alternate entry point 176 ciCallProfile call_profile_at_bci(int bci); 177 int interpreter_call_site_count(int bci); 178 179 // Given a certain calling environment, find the monomorphic target 180 // for the call. Return NULL if the call is not monomorphic in 181 // its calling environment. 182 ciMethod* find_monomorphic_target(ciInstanceKlass* caller, 183 ciInstanceKlass* callee_holder, 184 ciInstanceKlass* actual_receiver); 185 186 // Given a known receiver klass, find the target for the call. 187 // Return NULL if the call has no target or is abstract. 188 ciMethod* resolve_invoke(ciKlass* caller, ciKlass* exact_receiver); 189 190 // Find the proper vtable index to invoke this method. 191 int resolve_vtable_index(ciKlass* caller, ciKlass* receiver); 192 193 // Compilation directives 194 bool will_link(ciKlass* accessing_klass, 195 ciKlass* declared_method_holder, 196 Bytecodes::Code bc); 197 bool should_exclude(); 198 bool should_inline(); 199 bool should_not_inline(); 200 bool should_print_assembly(); 201 bool break_at_execute(); 202 bool has_option(const char *option); 203 bool can_be_compiled(); 204 bool can_be_osr_compiled(int entry_bci); 205 void set_not_compilable(); 206 bool has_compiled_code(); 207 int instructions_size(); 208 void log_nmethod_identity(xmlStream* log); 209 bool is_not_reached(int bci); 210 bool was_executed_more_than(int times); 211 bool has_unloaded_classes_in_signature(); 212 bool is_klass_loaded(int refinfo_index, bool must_be_resolved) const; 213 bool check_call(int refinfo_index, bool is_static) const; 214 void build_method_data(); // make sure it exists in the VM also 215 int scale_count(int count, float prof_factor = 1.); // make MDO count commensurate with IIC 216 bool is_method_handle_invoke(); 217 ciInstance* method_handle_type(); 218 219 // What kind of ciObject is this? 220 bool is_method() { return true; } 221 222 // Java access flags 223 bool is_public () const { return flags().is_public(); } 224 bool is_private () const { return flags().is_private(); } 225 bool is_protected () const { return flags().is_protected(); } 226 bool is_static () const { return flags().is_static(); } 227 bool is_final () const { return flags().is_final(); } 228 bool is_synchronized() const { return flags().is_synchronized(); } 229 bool is_native () const { return flags().is_native(); } 230 bool is_interface () const { return flags().is_interface(); } 231 bool is_abstract () const { return flags().is_abstract(); } 232 bool is_strict () const { return flags().is_strict(); } 233 234 // Other flags 235 bool is_empty_method() const; 236 bool is_vanilla_constructor() const; 237 bool is_final_method() const { return is_final() || holder()->is_final(); } 238 bool has_loops () const; 239 bool has_jsrs () const; 240 bool is_accessor () const; 241 bool is_initializer () const; 242 bool can_be_statically_bound() const { return _can_be_statically_bound; } 243 244 // Print the bytecodes of this method. 245 void print_codes_on(outputStream* st); 246 void print_codes() { 247 print_codes_on(tty); 248 } 249 void print_codes_on(int from, int to, outputStream* st); 250 251 // Print the name of this method in various incarnations. 252 void print_name(outputStream* st = tty); 253 void print_short_name(outputStream* st = tty); 254 };