frame.hpp revision 1472:c18cbe5936b8
1/* 2 * Copyright (c) 1997, 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 25typedef class BytecodeInterpreter* interpreterState; 26 27class CodeBlob; 28 29 30// A frame represents a physical stack frame (an activation). Frames 31// can be C or Java frames, and the Java frames can be interpreted or 32// compiled. In contrast, vframes represent source-level activations, 33// so that one physical frame can correspond to multiple source level 34// frames because of inlining. 35 36class frame VALUE_OBJ_CLASS_SPEC { 37 private: 38 // Instance variables: 39 intptr_t* _sp; // stack pointer (from Thread::last_Java_sp) 40 address _pc; // program counter (the next instruction after the call) 41 42 CodeBlob* _cb; // CodeBlob that "owns" pc 43 enum deopt_state { 44 not_deoptimized, 45 is_deoptimized, 46 unknown 47 }; 48 49 deopt_state _deopt_state; 50 51 public: 52 // Constructors 53 frame(); 54 55 // Accessors 56 57 // pc: Returns the pc at which this frame will continue normally. 58 // It must point at the beginning of the next instruction to execute. 59 address pc() const { return _pc; } 60 61 // This returns the pc that if you were in the debugger you'd see. Not 62 // the idealized value in the frame object. This undoes the magic conversion 63 // that happens for deoptimized frames. In addition it makes the value the 64 // hardware would want to see in the native frame. The only user (at this point) 65 // is deoptimization. It likely no one else should ever use it. 66 address raw_pc() const; 67 68 void set_pc( address newpc ); 69 70 intptr_t* sp() const { return _sp; } 71 void set_sp( intptr_t* newsp ) { _sp = newsp; } 72 73 74 CodeBlob* cb() const { return _cb; } 75 76 // patching operations 77 void patch_pc(Thread* thread, address pc); 78 79 // Every frame needs to return a unique id which distinguishes it from all other frames. 80 // For sparc and ia32 use sp. ia64 can have memory frames that are empty so multiple frames 81 // will have identical sp values. For ia64 the bsp (fp) value will serve. No real frame 82 // should have an id() of NULL so it is a distinguishing value for an unmatchable frame. 83 // We also have relationals which allow comparing a frame to anoth frame's id() allow 84 // us to distinguish younger (more recent activation) from older (less recent activations) 85 // A NULL id is only valid when comparing for equality. 86 87 intptr_t* id(void) const; 88 bool is_younger(intptr_t* id) const; 89 bool is_older(intptr_t* id) const; 90 91 // testers 92 93 // Compares for strict equality. Rarely used or needed. 94 // It can return a different result than f1.id() == f2.id() 95 bool equal(frame other) const; 96 97 // type testers 98 bool is_interpreted_frame() const; 99 bool is_java_frame() const; 100 bool is_entry_frame() const; // Java frame called from C? 101 bool is_native_frame() const; 102 bool is_runtime_frame() const; 103 bool is_compiled_frame() const; 104 bool is_safepoint_blob_frame() const; 105 bool is_deoptimized_frame() const; 106 107 // testers 108 bool is_first_frame() const; // oldest frame? (has no sender) 109 bool is_first_java_frame() const; // same for Java frame 110 111 bool is_interpreted_frame_valid(JavaThread* thread) const; // performs sanity checks on interpreted frames. 112 113 // tells whether this frame is marked for deoptimization 114 bool should_be_deoptimized() const; 115 116 // tells whether this frame can be deoptimized 117 bool can_be_deoptimized() const; 118 119 // returns the frame size in stack slots 120 int frame_size(RegisterMap* map) const; 121 122 // returns the sending frame 123 frame sender(RegisterMap* map) const; 124 125 // for Profiling - acting on another frame. walks sender frames 126 // if valid. 127 frame profile_find_Java_sender_frame(JavaThread *thread); 128 bool safe_for_sender(JavaThread *thread); 129 130 // returns the sender, but skips conversion frames 131 frame real_sender(RegisterMap* map) const; 132 133 // returns the the sending Java frame, skipping any intermediate C frames 134 // NB: receiver must not be first frame 135 frame java_sender() const; 136 137 private: 138 // Helper methods for better factored code in frame::sender 139 frame sender_for_compiled_frame(RegisterMap* map) const; 140 frame sender_for_entry_frame(RegisterMap* map) const; 141 frame sender_for_interpreter_frame(RegisterMap* map) const; 142 frame sender_for_native_frame(RegisterMap* map) const; 143 144 // All frames: 145 146 // A low-level interface for vframes: 147 148 public: 149 150 intptr_t* addr_at(int index) const { return &fp()[index]; } 151 intptr_t at(int index) const { return *addr_at(index); } 152 153 // accessors for locals 154 oop obj_at(int offset) const { return *obj_at_addr(offset); } 155 void obj_at_put(int offset, oop value) { *obj_at_addr(offset) = value; } 156 157 jint int_at(int offset) const { return *int_at_addr(offset); } 158 void int_at_put(int offset, jint value) { *int_at_addr(offset) = value; } 159 160 oop* obj_at_addr(int offset) const { return (oop*) addr_at(offset); } 161 162 oop* adjusted_obj_at_addr(methodOop method, int index) { return obj_at_addr(adjust_offset(method, index)); } 163 164 private: 165 jint* int_at_addr(int offset) const { return (jint*) addr_at(offset); } 166 167 public: 168 // Link (i.e., the pointer to the previous frame) 169 intptr_t* link() const; 170 void set_link(intptr_t* addr); 171 172 // Return address 173 address sender_pc() const; 174 175 // Support for deoptimization 176 void deoptimize(JavaThread* thread, bool thread_is_known_safe = false); 177 178 // The frame's original SP, before any extension by an interpreted callee; 179 // used for packing debug info into vframeArray objects and vframeArray lookup. 180 intptr_t* unextended_sp() const; 181 182 // returns the stack pointer of the calling frame 183 intptr_t* sender_sp() const; 184 185 186 // Interpreter frames: 187 188 private: 189 intptr_t** interpreter_frame_locals_addr() const; 190 intptr_t* interpreter_frame_bcx_addr() const; 191 intptr_t* interpreter_frame_mdx_addr() const; 192 193 public: 194 // Locals 195 196 // The _at version returns a pointer because the address is used for GC. 197 intptr_t* interpreter_frame_local_at(int index) const; 198 199 void interpreter_frame_set_locals(intptr_t* locs); 200 201 // byte code index/pointer (use these functions for unchecked frame access only!) 202 intptr_t interpreter_frame_bcx() const { return *interpreter_frame_bcx_addr(); } 203 void interpreter_frame_set_bcx(intptr_t bcx); 204 205 // byte code index 206 jint interpreter_frame_bci() const; 207 void interpreter_frame_set_bci(jint bci); 208 209 // byte code pointer 210 address interpreter_frame_bcp() const; 211 void interpreter_frame_set_bcp(address bcp); 212 213 // Unchecked access to the method data index/pointer. 214 // Only use this if you know what you are doing. 215 intptr_t interpreter_frame_mdx() const { return *interpreter_frame_mdx_addr(); } 216 void interpreter_frame_set_mdx(intptr_t mdx); 217 218 // method data pointer 219 address interpreter_frame_mdp() const; 220 void interpreter_frame_set_mdp(address dp); 221 222 // Find receiver out of caller's (compiled) argument list 223 oop retrieve_receiver(RegisterMap *reg_map); 224 225 // Return the monitor owner and BasicLock for compiled synchronized 226 // native methods so that biased locking can revoke the receiver's 227 // bias if necessary. Takes optional nmethod for this frame as 228 // argument to avoid performing repeated lookups in code cache. 229 BasicLock* compiled_synchronized_native_monitor (nmethod* nm = NULL); 230 oop compiled_synchronized_native_monitor_owner(nmethod* nm = NULL); 231 232 // Find receiver for an invoke when arguments are just pushed on stack (i.e., callee stack-frame is 233 // not setup) 234 oop interpreter_callee_receiver(symbolHandle signature) { return *interpreter_callee_receiver_addr(signature); } 235 236 237 oop* interpreter_callee_receiver_addr(symbolHandle signature); 238 239 240 // expression stack (may go up or down, direction == 1 or -1) 241 public: 242 intptr_t* interpreter_frame_expression_stack() const; 243 static jint interpreter_frame_expression_stack_direction(); 244 245 // The _at version returns a pointer because the address is used for GC. 246 intptr_t* interpreter_frame_expression_stack_at(jint offset) const; 247 248 // top of expression stack 249 intptr_t* interpreter_frame_tos_at(jint offset) const; 250 intptr_t* interpreter_frame_tos_address() const; 251 252 253 jint interpreter_frame_expression_stack_size() const; 254 255 intptr_t* interpreter_frame_sender_sp() const; 256 257#ifndef CC_INTERP 258 // template based interpreter deoptimization support 259 void set_interpreter_frame_sender_sp(intptr_t* sender_sp); 260 void interpreter_frame_set_monitor_end(BasicObjectLock* value); 261#endif // CC_INTERP 262 263 // BasicObjectLocks: 264 // 265 // interpreter_frame_monitor_begin is higher in memory than interpreter_frame_monitor_end 266 // Interpreter_frame_monitor_begin points to one element beyond the oldest one, 267 // interpreter_frame_monitor_end points to the youngest one, or if there are none, 268 // it points to one beyond where the first element will be. 269 // interpreter_frame_monitor_size reports the allocation size of a monitor in the interpreter stack. 270 // this value is >= BasicObjectLock::size(), and may be rounded up 271 272 BasicObjectLock* interpreter_frame_monitor_begin() const; 273 BasicObjectLock* interpreter_frame_monitor_end() const; 274 BasicObjectLock* next_monitor_in_interpreter_frame(BasicObjectLock* current) const; 275 BasicObjectLock* previous_monitor_in_interpreter_frame(BasicObjectLock* current) const; 276 static int interpreter_frame_monitor_size(); 277 278 void interpreter_frame_verify_monitor(BasicObjectLock* value) const; 279 280 // Tells whether the current interpreter_frame frame pointer 281 // corresponds to the old compiled/deoptimized fp 282 // The receiver used to be a top level frame 283 bool interpreter_frame_equals_unpacked_fp(intptr_t* fp); 284 285 // Return/result value from this interpreter frame 286 // If the method return type is T_OBJECT or T_ARRAY populates oop_result 287 // For other (non-T_VOID) the appropriate field in the jvalue is populated 288 // with the result value. 289 // Should only be called when at method exit when the method is not 290 // exiting due to an exception. 291 BasicType interpreter_frame_result(oop* oop_result, jvalue* value_result); 292 293 public: 294 // Method & constant pool cache 295 methodOop interpreter_frame_method() const; 296 void interpreter_frame_set_method(methodOop method); 297 methodOop* interpreter_frame_method_addr() const; 298 constantPoolCacheOop* interpreter_frame_cache_addr() const; 299 300 public: 301 // Entry frames 302 JavaCallWrapper* entry_frame_call_wrapper() const; 303 intptr_t* entry_frame_argument_at(int offset) const; 304 305 // tells whether there is another chunk of Delta stack above 306 bool entry_frame_is_first() const; 307 308 // Compiled frames: 309 310 public: 311 // Given the index of a local, and the number of argument words 312 // in this stack frame, tell which word of the stack frame to find 313 // the local in. Arguments are stored above the ofp/rpc pair, 314 // while other locals are stored below it. 315 // Since monitors (BasicLock blocks) are also assigned indexes, 316 // but may have different storage requirements, their presence 317 // can also affect the calculation of offsets. 318 static int local_offset_for_compiler(int local_index, int nof_args, int max_nof_locals, int max_nof_monitors); 319 320 // Given the index of a monitor, etc., tell which word of the 321 // stack frame contains the start of the BasicLock block. 322 // Note that the local index by convention is the __higher__ 323 // of the two indexes allocated to the block. 324 static int monitor_offset_for_compiler(int local_index, int nof_args, int max_nof_locals, int max_nof_monitors); 325 326 // Tell the smallest value that local_offset_for_compiler will attain. 327 // This is used to help determine how much stack frame to allocate. 328 static int min_local_offset_for_compiler(int nof_args, int max_nof_locals, int max_nof_monitors); 329 330 // Tells if this register must be spilled during a call. 331 // On Intel, all registers are smashed by calls. 332 static bool volatile_across_calls(Register reg); 333 334 335 // Safepoints 336 337 public: 338 oop saved_oop_result(RegisterMap* map) const; 339 void set_saved_oop_result(RegisterMap* map, oop obj); 340 341 // For debugging 342 private: 343 const char* print_name() const; 344 345 public: 346 void print_value() const { print_value_on(tty,NULL); } 347 void print_value_on(outputStream* st, JavaThread *thread) const; 348 void print_on(outputStream* st) const; 349 void interpreter_frame_print_on(outputStream* st) const; 350 void print_on_error(outputStream* st, char* buf, int buflen, bool verbose = false) const; 351 352 // Conversion from an VMReg to physical stack location 353 oop* oopmapreg_to_location(VMReg reg, const RegisterMap* regmap) const; 354 355 // Oops-do's 356 void oops_compiled_arguments_do(symbolHandle signature, bool has_receiver, const RegisterMap* reg_map, OopClosure* f); 357 void oops_interpreted_do(OopClosure* f, const RegisterMap* map, bool query_oop_map_cache = true); 358 359 private: 360 void oops_interpreted_arguments_do(symbolHandle signature, bool has_receiver, OopClosure* f); 361 362 // Iteration of oops 363 void oops_do_internal(OopClosure* f, CodeBlobClosure* cf, RegisterMap* map, bool use_interpreter_oop_map_cache); 364 void oops_entry_do(OopClosure* f, const RegisterMap* map); 365 void oops_code_blob_do(OopClosure* f, CodeBlobClosure* cf, const RegisterMap* map); 366 int adjust_offset(methodOop method, int index); // helper for above fn 367 public: 368 // Memory management 369 void oops_do(OopClosure* f, CodeBlobClosure* cf, RegisterMap* map) { oops_do_internal(f, cf, map, true); } 370 void nmethods_do(CodeBlobClosure* cf); 371 372 void gc_prologue(); 373 void gc_epilogue(); 374 void pd_gc_epilog(); 375 376# ifdef ENABLE_ZAP_DEAD_LOCALS 377 private: 378 class CheckValueClosure: public OopClosure { 379 public: 380 void do_oop(oop* p); 381 void do_oop(narrowOop* p) { ShouldNotReachHere(); } 382 }; 383 static CheckValueClosure _check_value; 384 385 class CheckOopClosure: public OopClosure { 386 public: 387 void do_oop(oop* p); 388 void do_oop(narrowOop* p) { ShouldNotReachHere(); } 389 }; 390 static CheckOopClosure _check_oop; 391 392 static void check_derived_oop(oop* base, oop* derived); 393 394 class ZapDeadClosure: public OopClosure { 395 public: 396 void do_oop(oop* p); 397 void do_oop(narrowOop* p) { ShouldNotReachHere(); } 398 }; 399 static ZapDeadClosure _zap_dead; 400 401 public: 402 // Zapping 403 void zap_dead_locals (JavaThread* thread, const RegisterMap* map); 404 void zap_dead_interpreted_locals(JavaThread* thread, const RegisterMap* map); 405 void zap_dead_compiled_locals (JavaThread* thread, const RegisterMap* map); 406 void zap_dead_entry_locals (JavaThread* thread, const RegisterMap* map); 407 void zap_dead_deoptimized_locals(JavaThread* thread, const RegisterMap* map); 408# endif 409 // Verification 410 void verify(const RegisterMap* map); 411 static bool verify_return_pc(address x); 412 static bool is_bci(intptr_t bcx); 413 // Usage: 414 // assert(frame::verify_return_pc(return_address), "must be a return pc"); 415 416 int pd_oop_map_offset_adjustment() const; 417 418# include "incls/_frame_pd.hpp.incl" 419}; 420 421 422// 423// StackFrameStream iterates through the frames of a thread starting from 424// top most frame. It automatically takes care of updating the location of 425// all (callee-saved) registers. Notice: If a thread is stopped at 426// a safepoint, all registers are saved, not only the callee-saved ones. 427// 428// Use: 429// 430// for(StackFrameStream fst(thread); !fst.is_done(); fst.next()) { 431// ... 432// } 433// 434class StackFrameStream : public StackObj { 435 private: 436 frame _fr; 437 RegisterMap _reg_map; 438 bool _is_done; 439 public: 440 StackFrameStream(JavaThread *thread, bool update = true); 441 442 // Iteration 443 bool is_done() { return (_is_done) ? true : (_is_done = _fr.is_first_frame(), false); } 444 void next() { if (!_is_done) _fr = _fr.sender(&_reg_map); } 445 446 // Query 447 frame *current() { return &_fr; } 448 RegisterMap* register_map() { return &_reg_map; } 449}; 450