Mercurial > hg > graal-compiler
annotate src/share/vm/runtime/frame.hpp @ 14692:8504393de66b
8037043: put Method flag bits in predictable positions
Reviewed-by: kvn, coleenp
author | twisti |
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date | Tue, 11 Mar 2014 14:54:47 -0700 |
parents | 16c705d792be |
children | d8041d695d19 |
rev | line source |
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0 | 1 /* |
10405 | 2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_RUNTIME_FRAME_HPP |
26 #define SHARE_VM_RUNTIME_FRAME_HPP | |
27 | |
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28 #include "oops/method.hpp" |
1972 | 29 #include "runtime/basicLock.hpp" |
30 #include "runtime/monitorChunk.hpp" | |
31 #include "runtime/registerMap.hpp" | |
32 #include "utilities/top.hpp" | |
33 #ifdef COMPILER2 | |
34 #ifdef TARGET_ARCH_MODEL_x86_32 | |
35 # include "adfiles/adGlobals_x86_32.hpp" | |
36 #endif | |
37 #ifdef TARGET_ARCH_MODEL_x86_64 | |
38 # include "adfiles/adGlobals_x86_64.hpp" | |
39 #endif | |
40 #ifdef TARGET_ARCH_MODEL_sparc | |
41 # include "adfiles/adGlobals_sparc.hpp" | |
42 #endif | |
43 #ifdef TARGET_ARCH_MODEL_zero | |
44 # include "adfiles/adGlobals_zero.hpp" | |
45 #endif | |
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46 #ifdef TARGET_ARCH_MODEL_arm |
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47 # include "adfiles/adGlobals_arm.hpp" |
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48 #endif |
14391 | 49 #ifdef TARGET_ARCH_MODEL_ppc_32 |
50 # include "adfiles/adGlobals_ppc_32.hpp" | |
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51 #endif |
14391 | 52 #ifdef TARGET_ARCH_MODEL_ppc_64 |
53 # include "adfiles/adGlobals_ppc_64.hpp" | |
1972 | 54 #endif |
14391 | 55 #endif // COMPILER2 |
1972 | 56 #ifdef ZERO |
57 #ifdef TARGET_ARCH_zero | |
58 # include "stack_zero.hpp" | |
59 #endif | |
60 #endif | |
61 | |
0 | 62 typedef class BytecodeInterpreter* interpreterState; |
63 | |
64 class CodeBlob; | |
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65 class FrameValues; |
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66 class vframeArray; |
0 | 67 |
68 | |
69 // A frame represents a physical stack frame (an activation). Frames | |
70 // can be C or Java frames, and the Java frames can be interpreted or | |
71 // compiled. In contrast, vframes represent source-level activations, | |
72 // so that one physical frame can correspond to multiple source level | |
73 // frames because of inlining. | |
74 | |
75 class frame VALUE_OBJ_CLASS_SPEC { | |
76 private: | |
77 // Instance variables: | |
78 intptr_t* _sp; // stack pointer (from Thread::last_Java_sp) | |
79 address _pc; // program counter (the next instruction after the call) | |
80 | |
81 CodeBlob* _cb; // CodeBlob that "owns" pc | |
82 enum deopt_state { | |
83 not_deoptimized, | |
84 is_deoptimized, | |
85 unknown | |
86 }; | |
87 | |
88 deopt_state _deopt_state; | |
89 | |
90 public: | |
91 // Constructors | |
92 frame(); | |
93 | |
94 // Accessors | |
95 | |
96 // pc: Returns the pc at which this frame will continue normally. | |
97 // It must point at the beginning of the next instruction to execute. | |
98 address pc() const { return _pc; } | |
99 | |
100 // This returns the pc that if you were in the debugger you'd see. Not | |
101 // the idealized value in the frame object. This undoes the magic conversion | |
102 // that happens for deoptimized frames. In addition it makes the value the | |
103 // hardware would want to see in the native frame. The only user (at this point) | |
104 // is deoptimization. It likely no one else should ever use it. | |
105 address raw_pc() const; | |
106 | |
107 void set_pc( address newpc ); | |
108 | |
109 intptr_t* sp() const { return _sp; } | |
110 void set_sp( intptr_t* newsp ) { _sp = newsp; } | |
111 | |
112 | |
113 CodeBlob* cb() const { return _cb; } | |
114 | |
115 // patching operations | |
116 void patch_pc(Thread* thread, address pc); | |
117 | |
118 // Every frame needs to return a unique id which distinguishes it from all other frames. | |
119 // For sparc and ia32 use sp. ia64 can have memory frames that are empty so multiple frames | |
120 // will have identical sp values. For ia64 the bsp (fp) value will serve. No real frame | |
121 // should have an id() of NULL so it is a distinguishing value for an unmatchable frame. | |
122 // We also have relationals which allow comparing a frame to anoth frame's id() allow | |
123 // us to distinguish younger (more recent activation) from older (less recent activations) | |
124 // A NULL id is only valid when comparing for equality. | |
125 | |
126 intptr_t* id(void) const; | |
127 bool is_younger(intptr_t* id) const; | |
128 bool is_older(intptr_t* id) const; | |
129 | |
130 // testers | |
131 | |
132 // Compares for strict equality. Rarely used or needed. | |
133 // It can return a different result than f1.id() == f2.id() | |
134 bool equal(frame other) const; | |
135 | |
136 // type testers | |
137 bool is_interpreted_frame() const; | |
138 bool is_java_frame() const; | |
139 bool is_entry_frame() const; // Java frame called from C? | |
10405 | 140 bool is_stub_frame() const; |
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141 bool is_ignored_frame() const; |
0 | 142 bool is_native_frame() const; |
143 bool is_runtime_frame() const; | |
144 bool is_compiled_frame() const; | |
145 bool is_safepoint_blob_frame() const; | |
146 bool is_deoptimized_frame() const; | |
147 | |
148 // testers | |
149 bool is_first_frame() const; // oldest frame? (has no sender) | |
150 bool is_first_java_frame() const; // same for Java frame | |
151 | |
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152 bool is_interpreted_frame_valid(JavaThread* thread) const; // performs sanity checks on interpreted frames. |
0 | 153 |
154 // tells whether this frame is marked for deoptimization | |
155 bool should_be_deoptimized() const; | |
156 | |
157 // tells whether this frame can be deoptimized | |
158 bool can_be_deoptimized() const; | |
159 | |
160 // returns the frame size in stack slots | |
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161 int frame_size(RegisterMap* map) const; |
0 | 162 |
163 // returns the sending frame | |
164 frame sender(RegisterMap* map) const; | |
165 | |
166 // for Profiling - acting on another frame. walks sender frames | |
167 // if valid. | |
168 frame profile_find_Java_sender_frame(JavaThread *thread); | |
169 bool safe_for_sender(JavaThread *thread); | |
170 | |
171 // returns the sender, but skips conversion frames | |
172 frame real_sender(RegisterMap* map) const; | |
173 | |
174 // returns the the sending Java frame, skipping any intermediate C frames | |
175 // NB: receiver must not be first frame | |
176 frame java_sender() const; | |
177 | |
178 private: | |
179 // Helper methods for better factored code in frame::sender | |
180 frame sender_for_compiled_frame(RegisterMap* map) const; | |
181 frame sender_for_entry_frame(RegisterMap* map) const; | |
182 frame sender_for_interpreter_frame(RegisterMap* map) const; | |
183 frame sender_for_native_frame(RegisterMap* map) const; | |
184 | |
185 // All frames: | |
186 | |
187 // A low-level interface for vframes: | |
188 | |
189 public: | |
190 | |
191 intptr_t* addr_at(int index) const { return &fp()[index]; } | |
192 intptr_t at(int index) const { return *addr_at(index); } | |
193 | |
194 // accessors for locals | |
195 oop obj_at(int offset) const { return *obj_at_addr(offset); } | |
196 void obj_at_put(int offset, oop value) { *obj_at_addr(offset) = value; } | |
197 | |
198 jint int_at(int offset) const { return *int_at_addr(offset); } | |
199 void int_at_put(int offset, jint value) { *int_at_addr(offset) = value; } | |
200 | |
201 oop* obj_at_addr(int offset) const { return (oop*) addr_at(offset); } | |
202 | |
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203 oop* adjusted_obj_at_addr(Method* method, int index) { return obj_at_addr(adjust_offset(method, index)); } |
0 | 204 |
205 private: | |
206 jint* int_at_addr(int offset) const { return (jint*) addr_at(offset); } | |
207 | |
208 public: | |
209 // Link (i.e., the pointer to the previous frame) | |
210 intptr_t* link() const; | |
211 void set_link(intptr_t* addr); | |
212 | |
213 // Return address | |
214 address sender_pc() const; | |
215 | |
216 // Support for deoptimization | |
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217 void deoptimize(JavaThread* thread); |
0 | 218 |
219 // The frame's original SP, before any extension by an interpreted callee; | |
220 // used for packing debug info into vframeArray objects and vframeArray lookup. | |
221 intptr_t* unextended_sp() const; | |
222 | |
223 // returns the stack pointer of the calling frame | |
224 intptr_t* sender_sp() const; | |
225 | |
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226 // Returns the real 'frame pointer' for the current frame. |
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227 // This is the value expected by the platform ABI when it defines a |
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228 // frame pointer register. It may differ from the effective value of |
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229 // the FP register when that register is used in the JVM for other |
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230 // purposes (like compiled frames on some platforms). |
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231 // On other platforms, it is defined so that the stack area used by |
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232 // this frame goes from real_fp() to sp(). |
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233 intptr_t* real_fp() const; |
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234 |
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235 // Deoptimization info, if needed (platform dependent). |
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236 // Stored in the initial_info field of the unroll info, to be used by |
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237 // the platform dependent deoptimization blobs. |
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238 intptr_t *initial_deoptimization_info(); |
0 | 239 |
240 // Interpreter frames: | |
241 | |
242 private: | |
243 intptr_t** interpreter_frame_locals_addr() const; | |
244 intptr_t* interpreter_frame_bcx_addr() const; | |
245 intptr_t* interpreter_frame_mdx_addr() const; | |
246 | |
247 public: | |
248 // Locals | |
249 | |
250 // The _at version returns a pointer because the address is used for GC. | |
251 intptr_t* interpreter_frame_local_at(int index) const; | |
252 | |
253 void interpreter_frame_set_locals(intptr_t* locs); | |
254 | |
255 // byte code index/pointer (use these functions for unchecked frame access only!) | |
256 intptr_t interpreter_frame_bcx() const { return *interpreter_frame_bcx_addr(); } | |
257 void interpreter_frame_set_bcx(intptr_t bcx); | |
258 | |
259 // byte code index | |
260 jint interpreter_frame_bci() const; | |
261 void interpreter_frame_set_bci(jint bci); | |
262 | |
263 // byte code pointer | |
264 address interpreter_frame_bcp() const; | |
265 void interpreter_frame_set_bcp(address bcp); | |
266 | |
267 // Unchecked access to the method data index/pointer. | |
268 // Only use this if you know what you are doing. | |
269 intptr_t interpreter_frame_mdx() const { return *interpreter_frame_mdx_addr(); } | |
270 void interpreter_frame_set_mdx(intptr_t mdx); | |
271 | |
272 // method data pointer | |
273 address interpreter_frame_mdp() const; | |
274 void interpreter_frame_set_mdp(address dp); | |
275 | |
276 // Find receiver out of caller's (compiled) argument list | |
277 oop retrieve_receiver(RegisterMap *reg_map); | |
278 | |
279 // Return the monitor owner and BasicLock for compiled synchronized | |
280 // native methods so that biased locking can revoke the receiver's | |
2019 | 281 // bias if necessary. This is also used by JVMTI's GetLocalInstance method |
282 // (via VM_GetReceiver) to retrieve the receiver from a native wrapper frame. | |
283 BasicLock* get_native_monitor(); | |
284 oop get_native_receiver(); | |
0 | 285 |
286 // Find receiver for an invoke when arguments are just pushed on stack (i.e., callee stack-frame is | |
287 // not setup) | |
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288 oop interpreter_callee_receiver(Symbol* signature) { return *interpreter_callee_receiver_addr(signature); } |
0 | 289 |
290 | |
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291 oop* interpreter_callee_receiver_addr(Symbol* signature); |
0 | 292 |
293 | |
294 // expression stack (may go up or down, direction == 1 or -1) | |
295 public: | |
296 intptr_t* interpreter_frame_expression_stack() const; | |
297 static jint interpreter_frame_expression_stack_direction(); | |
298 | |
299 // The _at version returns a pointer because the address is used for GC. | |
300 intptr_t* interpreter_frame_expression_stack_at(jint offset) const; | |
301 | |
302 // top of expression stack | |
303 intptr_t* interpreter_frame_tos_at(jint offset) const; | |
304 intptr_t* interpreter_frame_tos_address() const; | |
305 | |
306 | |
307 jint interpreter_frame_expression_stack_size() const; | |
308 | |
309 intptr_t* interpreter_frame_sender_sp() const; | |
310 | |
311 #ifndef CC_INTERP | |
312 // template based interpreter deoptimization support | |
313 void set_interpreter_frame_sender_sp(intptr_t* sender_sp); | |
314 void interpreter_frame_set_monitor_end(BasicObjectLock* value); | |
315 #endif // CC_INTERP | |
316 | |
14508 | 317 // Address of the temp oop in the frame. Needed as GC root. |
318 oop* interpreter_frame_temp_oop_addr() const; | |
319 | |
0 | 320 // BasicObjectLocks: |
321 // | |
322 // interpreter_frame_monitor_begin is higher in memory than interpreter_frame_monitor_end | |
323 // Interpreter_frame_monitor_begin points to one element beyond the oldest one, | |
324 // interpreter_frame_monitor_end points to the youngest one, or if there are none, | |
325 // it points to one beyond where the first element will be. | |
326 // interpreter_frame_monitor_size reports the allocation size of a monitor in the interpreter stack. | |
327 // this value is >= BasicObjectLock::size(), and may be rounded up | |
328 | |
329 BasicObjectLock* interpreter_frame_monitor_begin() const; | |
330 BasicObjectLock* interpreter_frame_monitor_end() const; | |
331 BasicObjectLock* next_monitor_in_interpreter_frame(BasicObjectLock* current) const; | |
332 BasicObjectLock* previous_monitor_in_interpreter_frame(BasicObjectLock* current) const; | |
333 static int interpreter_frame_monitor_size(); | |
334 | |
335 void interpreter_frame_verify_monitor(BasicObjectLock* value) const; | |
336 | |
337 // Tells whether the current interpreter_frame frame pointer | |
338 // corresponds to the old compiled/deoptimized fp | |
339 // The receiver used to be a top level frame | |
340 bool interpreter_frame_equals_unpacked_fp(intptr_t* fp); | |
341 | |
342 // Return/result value from this interpreter frame | |
343 // If the method return type is T_OBJECT or T_ARRAY populates oop_result | |
344 // For other (non-T_VOID) the appropriate field in the jvalue is populated | |
345 // with the result value. | |
346 // Should only be called when at method exit when the method is not | |
347 // exiting due to an exception. | |
348 BasicType interpreter_frame_result(oop* oop_result, jvalue* value_result); | |
349 | |
350 public: | |
351 // Method & constant pool cache | |
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352 Method* interpreter_frame_method() const; |
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353 void interpreter_frame_set_method(Method* method); |
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354 Method** interpreter_frame_method_addr() const; |
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355 ConstantPoolCache** interpreter_frame_cache_addr() const; |
0 | 356 |
357 public: | |
358 // Entry frames | |
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359 JavaCallWrapper* entry_frame_call_wrapper() const { return *entry_frame_call_wrapper_addr(); } |
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360 JavaCallWrapper* entry_frame_call_wrapper_if_safe(JavaThread* thread) const; |
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361 JavaCallWrapper** entry_frame_call_wrapper_addr() const; |
0 | 362 intptr_t* entry_frame_argument_at(int offset) const; |
363 | |
364 // tells whether there is another chunk of Delta stack above | |
365 bool entry_frame_is_first() const; | |
366 | |
367 // Compiled frames: | |
368 | |
369 public: | |
370 // Given the index of a local, and the number of argument words | |
371 // in this stack frame, tell which word of the stack frame to find | |
372 // the local in. Arguments are stored above the ofp/rpc pair, | |
373 // while other locals are stored below it. | |
374 // Since monitors (BasicLock blocks) are also assigned indexes, | |
375 // but may have different storage requirements, their presence | |
376 // can also affect the calculation of offsets. | |
377 static int local_offset_for_compiler(int local_index, int nof_args, int max_nof_locals, int max_nof_monitors); | |
378 | |
379 // Given the index of a monitor, etc., tell which word of the | |
380 // stack frame contains the start of the BasicLock block. | |
381 // Note that the local index by convention is the __higher__ | |
382 // of the two indexes allocated to the block. | |
383 static int monitor_offset_for_compiler(int local_index, int nof_args, int max_nof_locals, int max_nof_monitors); | |
384 | |
385 // Tell the smallest value that local_offset_for_compiler will attain. | |
386 // This is used to help determine how much stack frame to allocate. | |
387 static int min_local_offset_for_compiler(int nof_args, int max_nof_locals, int max_nof_monitors); | |
388 | |
389 // Tells if this register must be spilled during a call. | |
390 // On Intel, all registers are smashed by calls. | |
391 static bool volatile_across_calls(Register reg); | |
392 | |
393 | |
394 // Safepoints | |
395 | |
396 public: | |
397 oop saved_oop_result(RegisterMap* map) const; | |
398 void set_saved_oop_result(RegisterMap* map, oop obj); | |
399 | |
400 // For debugging | |
401 private: | |
402 const char* print_name() const; | |
403 | |
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404 void describe_pd(FrameValues& values, int frame_no); |
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405 |
0 | 406 public: |
407 void print_value() const { print_value_on(tty,NULL); } | |
408 void print_value_on(outputStream* st, JavaThread *thread) const; | |
409 void print_on(outputStream* st) const; | |
410 void interpreter_frame_print_on(outputStream* st) const; | |
411 void print_on_error(outputStream* st, char* buf, int buflen, bool verbose = false) const; | |
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412 static void print_C_frame(outputStream* st, char* buf, int buflen, address pc); |
0 | 413 |
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414 // Add annotated descriptions of memory locations belonging to this frame to values |
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415 void describe(FrameValues& values, int frame_no); |
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416 |
0 | 417 // Conversion from an VMReg to physical stack location |
418 oop* oopmapreg_to_location(VMReg reg, const RegisterMap* regmap) const; | |
419 | |
420 // Oops-do's | |
10390 | 421 void oops_compiled_arguments_do(Symbol* signature, bool has_receiver, bool has_appendix, const RegisterMap* reg_map, OopClosure* f); |
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422 void oops_interpreted_do(OopClosure* f, CLDClosure* cld_f, const RegisterMap* map, bool query_oop_map_cache = true); |
0 | 423 |
424 private: | |
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425 void oops_interpreted_arguments_do(Symbol* signature, bool has_receiver, OopClosure* f); |
0 | 426 |
427 // Iteration of oops | |
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428 void oops_do_internal(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf, RegisterMap* map, bool use_interpreter_oop_map_cache); |
0 | 429 void oops_entry_do(OopClosure* f, const RegisterMap* map); |
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430 void oops_code_blob_do(OopClosure* f, CodeBlobClosure* cf, const RegisterMap* map); |
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431 int adjust_offset(Method* method, int index); // helper for above fn |
0 | 432 public: |
433 // Memory management | |
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434 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf, RegisterMap* map) { oops_do_internal(f, cld_f, cf, map, true); } |
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435 void nmethods_do(CodeBlobClosure* cf); |
0 | 436 |
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437 // RedefineClasses support for finding live interpreted methods on the stack |
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438 void metadata_do(void f(Metadata*)); |
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439 |
0 | 440 void gc_prologue(); |
441 void gc_epilogue(); | |
442 void pd_gc_epilog(); | |
443 | |
444 # ifdef ENABLE_ZAP_DEAD_LOCALS | |
445 private: | |
446 class CheckValueClosure: public OopClosure { | |
113
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447 public: |
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448 void do_oop(oop* p); |
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449 void do_oop(narrowOop* p) { ShouldNotReachHere(); } |
0 | 450 }; |
451 static CheckValueClosure _check_value; | |
452 | |
453 class CheckOopClosure: public OopClosure { | |
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454 public: |
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455 void do_oop(oop* p); |
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456 void do_oop(narrowOop* p) { ShouldNotReachHere(); } |
0 | 457 }; |
458 static CheckOopClosure _check_oop; | |
459 | |
460 static void check_derived_oop(oop* base, oop* derived); | |
461 | |
462 class ZapDeadClosure: public OopClosure { | |
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463 public: |
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464 void do_oop(oop* p); |
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465 void do_oop(narrowOop* p) { ShouldNotReachHere(); } |
0 | 466 }; |
467 static ZapDeadClosure _zap_dead; | |
468 | |
469 public: | |
470 // Zapping | |
471 void zap_dead_locals (JavaThread* thread, const RegisterMap* map); | |
472 void zap_dead_interpreted_locals(JavaThread* thread, const RegisterMap* map); | |
473 void zap_dead_compiled_locals (JavaThread* thread, const RegisterMap* map); | |
474 void zap_dead_entry_locals (JavaThread* thread, const RegisterMap* map); | |
475 void zap_dead_deoptimized_locals(JavaThread* thread, const RegisterMap* map); | |
476 # endif | |
477 // Verification | |
478 void verify(const RegisterMap* map); | |
479 static bool verify_return_pc(address x); | |
480 static bool is_bci(intptr_t bcx); | |
481 // Usage: | |
482 // assert(frame::verify_return_pc(return_address), "must be a return pc"); | |
483 | |
484 int pd_oop_map_offset_adjustment() const; | |
485 | |
1972 | 486 #ifdef TARGET_ARCH_x86 |
487 # include "frame_x86.hpp" | |
488 #endif | |
489 #ifdef TARGET_ARCH_sparc | |
490 # include "frame_sparc.hpp" | |
491 #endif | |
492 #ifdef TARGET_ARCH_zero | |
493 # include "frame_zero.hpp" | |
494 #endif | |
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495 #ifdef TARGET_ARCH_arm |
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496 # include "frame_arm.hpp" |
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497 #endif |
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498 #ifdef TARGET_ARCH_ppc |
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499 # include "frame_ppc.hpp" |
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500 #endif |
1972 | 501 |
0 | 502 }; |
503 | |
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504 #ifndef PRODUCT |
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505 // A simple class to describe a location on the stack |
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506 class FrameValue VALUE_OBJ_CLASS_SPEC { |
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507 public: |
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508 intptr_t* location; |
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509 char* description; |
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510 int owner; |
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511 int priority; |
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512 }; |
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513 |
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514 |
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515 // A collection of described stack values that can print a symbolic |
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516 // description of the stack memory. Interpreter frame values can be |
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517 // in the caller frames so all the values are collected first and then |
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518 // sorted before being printed. |
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519 class FrameValues { |
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520 private: |
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521 GrowableArray<FrameValue> _values; |
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522 |
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523 static int compare(FrameValue* a, FrameValue* b) { |
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524 if (a->location == b->location) { |
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525 return a->priority - b->priority; |
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526 } |
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527 return a->location - b->location; |
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528 } |
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529 |
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530 public: |
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531 // Used by frame functions to describe locations. |
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532 void describe(int owner, intptr_t* location, const char* description, int priority = 0); |
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533 |
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534 #ifdef ASSERT |
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535 void validate(); |
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536 #endif |
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537 void print(JavaThread* thread); |
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538 }; |
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539 |
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540 #endif |
0 | 541 |
542 // | |
543 // StackFrameStream iterates through the frames of a thread starting from | |
544 // top most frame. It automatically takes care of updating the location of | |
545 // all (callee-saved) registers. Notice: If a thread is stopped at | |
546 // a safepoint, all registers are saved, not only the callee-saved ones. | |
547 // | |
548 // Use: | |
549 // | |
550 // for(StackFrameStream fst(thread); !fst.is_done(); fst.next()) { | |
551 // ... | |
552 // } | |
553 // | |
554 class StackFrameStream : public StackObj { | |
555 private: | |
556 frame _fr; | |
557 RegisterMap _reg_map; | |
558 bool _is_done; | |
559 public: | |
560 StackFrameStream(JavaThread *thread, bool update = true); | |
561 | |
562 // Iteration | |
563 bool is_done() { return (_is_done) ? true : (_is_done = _fr.is_first_frame(), false); } | |
564 void next() { if (!_is_done) _fr = _fr.sender(&_reg_map); } | |
565 | |
566 // Query | |
567 frame *current() { return &_fr; } | |
568 RegisterMap* register_map() { return &_reg_map; } | |
569 }; | |
1972 | 570 |
571 #endif // SHARE_VM_RUNTIME_FRAME_HPP |