Mercurial > hg > graal-jvmci-8
annotate src/share/vm/runtime/frame.hpp @ 24234:ea6f94ab283b default tip
Added tag jvmci-0.36 for changeset 8128b98d4736
author | Gilles Duboscq <gilles.m.duboscq@oracle.com> |
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date | Mon, 18 Sep 2017 18:49:45 +0200 |
parents | dd9cc155639c |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2015, 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 | |
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34 #if defined ADGLOBALS_MD_HPP |
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35 # include ADGLOBALS_MD_HPP |
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36 #elif defined TARGET_ARCH_MODEL_x86_32 |
1972 | 37 # include "adfiles/adGlobals_x86_32.hpp" |
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38 #elif defined TARGET_ARCH_MODEL_x86_64 |
1972 | 39 # include "adfiles/adGlobals_x86_64.hpp" |
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40 #elif defined TARGET_ARCH_MODEL_sparc |
1972 | 41 # include "adfiles/adGlobals_sparc.hpp" |
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42 #elif defined TARGET_ARCH_MODEL_zero |
1972 | 43 # include "adfiles/adGlobals_zero.hpp" |
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44 #elif defined TARGET_ARCH_MODEL_ppc_64 |
14391 | 45 # include "adfiles/adGlobals_ppc_64.hpp" |
1972 | 46 #endif |
14391 | 47 #endif // COMPILER2 |
1972 | 48 #ifdef ZERO |
49 #ifdef TARGET_ARCH_zero | |
50 # include "stack_zero.hpp" | |
51 #endif | |
52 #endif | |
53 | |
0 | 54 typedef class BytecodeInterpreter* interpreterState; |
55 | |
56 class CodeBlob; | |
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57 class FrameValues; |
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58 class vframeArray; |
0 | 59 |
60 | |
61 // A frame represents a physical stack frame (an activation). Frames | |
62 // can be C or Java frames, and the Java frames can be interpreted or | |
63 // compiled. In contrast, vframes represent source-level activations, | |
64 // so that one physical frame can correspond to multiple source level | |
65 // frames because of inlining. | |
66 | |
67 class frame VALUE_OBJ_CLASS_SPEC { | |
68 private: | |
69 // Instance variables: | |
70 intptr_t* _sp; // stack pointer (from Thread::last_Java_sp) | |
71 address _pc; // program counter (the next instruction after the call) | |
72 | |
73 CodeBlob* _cb; // CodeBlob that "owns" pc | |
74 enum deopt_state { | |
75 not_deoptimized, | |
76 is_deoptimized, | |
77 unknown | |
78 }; | |
79 | |
80 deopt_state _deopt_state; | |
81 | |
82 public: | |
83 // Constructors | |
84 frame(); | |
85 | |
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86 #ifndef PRODUCT |
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87 // This is a generic constructor which is only used by pns() in debug.cpp. |
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88 // pns (i.e. print native stack) uses this constructor to create a starting |
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89 // frame for stack walking. The implementation of this constructor is platform |
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90 // dependent (i.e. SPARC doesn't need an 'fp' argument an will ignore it) but |
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91 // we want to keep the signature generic because pns() is shared code. |
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92 frame(void* sp, void* fp, void* pc); |
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93 #endif |
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94 |
0 | 95 // Accessors |
96 | |
97 // pc: Returns the pc at which this frame will continue normally. | |
98 // It must point at the beginning of the next instruction to execute. | |
99 address pc() const { return _pc; } | |
100 | |
101 // This returns the pc that if you were in the debugger you'd see. Not | |
102 // the idealized value in the frame object. This undoes the magic conversion | |
103 // that happens for deoptimized frames. In addition it makes the value the | |
104 // hardware would want to see in the native frame. The only user (at this point) | |
105 // is deoptimization. It likely no one else should ever use it. | |
106 address raw_pc() const; | |
107 | |
108 void set_pc( address newpc ); | |
109 | |
110 intptr_t* sp() const { return _sp; } | |
111 void set_sp( intptr_t* newsp ) { _sp = newsp; } | |
112 | |
113 | |
114 CodeBlob* cb() const { return _cb; } | |
115 | |
116 // patching operations | |
117 void patch_pc(Thread* thread, address pc); | |
118 | |
119 // Every frame needs to return a unique id which distinguishes it from all other frames. | |
120 // For sparc and ia32 use sp. ia64 can have memory frames that are empty so multiple frames | |
121 // will have identical sp values. For ia64 the bsp (fp) value will serve. No real frame | |
122 // should have an id() of NULL so it is a distinguishing value for an unmatchable frame. | |
123 // We also have relationals which allow comparing a frame to anoth frame's id() allow | |
124 // us to distinguish younger (more recent activation) from older (less recent activations) | |
125 // A NULL id is only valid when comparing for equality. | |
126 | |
127 intptr_t* id(void) const; | |
128 bool is_younger(intptr_t* id) const; | |
129 bool is_older(intptr_t* id) const; | |
130 | |
131 // testers | |
132 | |
133 // Compares for strict equality. Rarely used or needed. | |
134 // It can return a different result than f1.id() == f2.id() | |
135 bool equal(frame other) const; | |
136 | |
137 // type testers | |
138 bool is_interpreted_frame() const; | |
139 bool is_java_frame() const; | |
140 bool is_entry_frame() const; // Java frame called from C? | |
10405 | 141 bool is_stub_frame() const; |
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142 bool is_ignored_frame() const; |
0 | 143 bool is_native_frame() const; |
144 bool is_runtime_frame() const; | |
145 bool is_compiled_frame() const; | |
146 bool is_safepoint_blob_frame() const; | |
147 bool is_deoptimized_frame() const; | |
148 | |
149 // testers | |
150 bool is_first_frame() const; // oldest frame? (has no sender) | |
151 bool is_first_java_frame() const; // same for Java frame | |
152 | |
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153 bool is_interpreted_frame_valid(JavaThread* thread) const; // performs sanity checks on interpreted frames. |
0 | 154 |
155 // tells whether this frame is marked for deoptimization | |
156 bool should_be_deoptimized() const; | |
157 | |
158 // tells whether this frame can be deoptimized | |
159 bool can_be_deoptimized() const; | |
160 | |
161 // returns the frame size in stack slots | |
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162 int frame_size(RegisterMap* map) const; |
0 | 163 |
164 // returns the sending frame | |
165 frame sender(RegisterMap* map) const; | |
166 | |
167 // for Profiling - acting on another frame. walks sender frames | |
168 // if valid. | |
169 frame profile_find_Java_sender_frame(JavaThread *thread); | |
170 bool safe_for_sender(JavaThread *thread); | |
171 | |
172 // returns the sender, but skips conversion frames | |
173 frame real_sender(RegisterMap* map) const; | |
174 | |
175 // returns the the sending Java frame, skipping any intermediate C frames | |
176 // NB: receiver must not be first frame | |
177 frame java_sender() const; | |
178 | |
179 private: | |
180 // Helper methods for better factored code in frame::sender | |
181 frame sender_for_compiled_frame(RegisterMap* map) const; | |
182 frame sender_for_entry_frame(RegisterMap* map) const; | |
183 frame sender_for_interpreter_frame(RegisterMap* map) const; | |
184 frame sender_for_native_frame(RegisterMap* map) const; | |
185 | |
186 // All frames: | |
187 | |
188 // A low-level interface for vframes: | |
189 | |
190 public: | |
191 | |
192 intptr_t* addr_at(int index) const { return &fp()[index]; } | |
193 intptr_t at(int index) const { return *addr_at(index); } | |
194 | |
195 // accessors for locals | |
196 oop obj_at(int offset) const { return *obj_at_addr(offset); } | |
197 void obj_at_put(int offset, oop value) { *obj_at_addr(offset) = value; } | |
198 | |
199 jint int_at(int offset) const { return *int_at_addr(offset); } | |
200 void int_at_put(int offset, jint value) { *int_at_addr(offset) = value; } | |
201 | |
202 oop* obj_at_addr(int offset) const { return (oop*) addr_at(offset); } | |
203 | |
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204 oop* adjusted_obj_at_addr(Method* method, int index) { return obj_at_addr(adjust_offset(method, index)); } |
0 | 205 |
206 private: | |
207 jint* int_at_addr(int offset) const { return (jint*) addr_at(offset); } | |
208 | |
209 public: | |
210 // Link (i.e., the pointer to the previous frame) | |
211 intptr_t* link() const; | |
212 void set_link(intptr_t* addr); | |
213 | |
214 // Return address | |
215 address sender_pc() const; | |
216 | |
217 // Support for deoptimization | |
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218 void deoptimize(JavaThread* thread); |
0 | 219 |
220 // The frame's original SP, before any extension by an interpreted callee; | |
221 // used for packing debug info into vframeArray objects and vframeArray lookup. | |
222 intptr_t* unextended_sp() const; | |
223 | |
224 // returns the stack pointer of the calling frame | |
225 intptr_t* sender_sp() const; | |
226 | |
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227 // Returns the real 'frame pointer' for the current frame. |
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228 // This is the value expected by the platform ABI when it defines a |
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229 // frame pointer register. It may differ from the effective value of |
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230 // the FP register when that register is used in the JVM for other |
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231 // purposes (like compiled frames on some platforms). |
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232 // On other platforms, it is defined so that the stack area used by |
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233 // this frame goes from real_fp() to sp(). |
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234 intptr_t* real_fp() const; |
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235 |
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236 // Deoptimization info, if needed (platform dependent). |
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237 // Stored in the initial_info field of the unroll info, to be used by |
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238 // the platform dependent deoptimization blobs. |
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239 intptr_t *initial_deoptimization_info(); |
0 | 240 |
241 // Interpreter frames: | |
242 | |
243 private: | |
244 intptr_t** interpreter_frame_locals_addr() const; | |
245 intptr_t* interpreter_frame_bcx_addr() const; | |
246 intptr_t* interpreter_frame_mdx_addr() const; | |
247 | |
248 public: | |
249 // Locals | |
250 | |
251 // The _at version returns a pointer because the address is used for GC. | |
252 intptr_t* interpreter_frame_local_at(int index) const; | |
253 | |
254 void interpreter_frame_set_locals(intptr_t* locs); | |
255 | |
256 // byte code index/pointer (use these functions for unchecked frame access only!) | |
257 intptr_t interpreter_frame_bcx() const { return *interpreter_frame_bcx_addr(); } | |
258 void interpreter_frame_set_bcx(intptr_t bcx); | |
259 | |
260 // byte code index | |
261 jint interpreter_frame_bci() const; | |
262 void interpreter_frame_set_bci(jint bci); | |
263 | |
264 // byte code pointer | |
265 address interpreter_frame_bcp() const; | |
266 void interpreter_frame_set_bcp(address bcp); | |
267 | |
268 // Unchecked access to the method data index/pointer. | |
269 // Only use this if you know what you are doing. | |
270 intptr_t interpreter_frame_mdx() const { return *interpreter_frame_mdx_addr(); } | |
271 void interpreter_frame_set_mdx(intptr_t mdx); | |
272 | |
273 // method data pointer | |
274 address interpreter_frame_mdp() const; | |
275 void interpreter_frame_set_mdp(address dp); | |
276 | |
277 // Find receiver out of caller's (compiled) argument list | |
278 oop retrieve_receiver(RegisterMap *reg_map); | |
279 | |
280 // Return the monitor owner and BasicLock for compiled synchronized | |
281 // native methods so that biased locking can revoke the receiver's | |
2019 | 282 // bias if necessary. This is also used by JVMTI's GetLocalInstance method |
283 // (via VM_GetReceiver) to retrieve the receiver from a native wrapper frame. | |
284 BasicLock* get_native_monitor(); | |
285 oop get_native_receiver(); | |
0 | 286 |
287 // Find receiver for an invoke when arguments are just pushed on stack (i.e., callee stack-frame is | |
288 // not setup) | |
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289 oop interpreter_callee_receiver(Symbol* signature) { return *interpreter_callee_receiver_addr(signature); } |
0 | 290 |
291 | |
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292 oop* interpreter_callee_receiver_addr(Symbol* signature); |
0 | 293 |
294 | |
295 // expression stack (may go up or down, direction == 1 or -1) | |
296 public: | |
297 intptr_t* interpreter_frame_expression_stack() const; | |
298 static jint interpreter_frame_expression_stack_direction(); | |
299 | |
300 // The _at version returns a pointer because the address is used for GC. | |
301 intptr_t* interpreter_frame_expression_stack_at(jint offset) const; | |
302 | |
303 // top of expression stack | |
304 intptr_t* interpreter_frame_tos_at(jint offset) const; | |
305 intptr_t* interpreter_frame_tos_address() const; | |
306 | |
307 | |
308 jint interpreter_frame_expression_stack_size() const; | |
309 | |
310 intptr_t* interpreter_frame_sender_sp() const; | |
311 | |
312 #ifndef CC_INTERP | |
313 // template based interpreter deoptimization support | |
314 void set_interpreter_frame_sender_sp(intptr_t* sender_sp); | |
315 void interpreter_frame_set_monitor_end(BasicObjectLock* value); | |
316 #endif // CC_INTERP | |
317 | |
14508 | 318 // Address of the temp oop in the frame. Needed as GC root. |
319 oop* interpreter_frame_temp_oop_addr() const; | |
320 | |
0 | 321 // BasicObjectLocks: |
322 // | |
323 // interpreter_frame_monitor_begin is higher in memory than interpreter_frame_monitor_end | |
324 // Interpreter_frame_monitor_begin points to one element beyond the oldest one, | |
325 // interpreter_frame_monitor_end points to the youngest one, or if there are none, | |
326 // it points to one beyond where the first element will be. | |
327 // interpreter_frame_monitor_size reports the allocation size of a monitor in the interpreter stack. | |
328 // this value is >= BasicObjectLock::size(), and may be rounded up | |
329 | |
330 BasicObjectLock* interpreter_frame_monitor_begin() const; | |
331 BasicObjectLock* interpreter_frame_monitor_end() const; | |
332 BasicObjectLock* next_monitor_in_interpreter_frame(BasicObjectLock* current) const; | |
333 BasicObjectLock* previous_monitor_in_interpreter_frame(BasicObjectLock* current) const; | |
334 static int interpreter_frame_monitor_size(); | |
335 | |
336 void interpreter_frame_verify_monitor(BasicObjectLock* value) const; | |
337 | |
338 // Tells whether the current interpreter_frame frame pointer | |
339 // corresponds to the old compiled/deoptimized fp | |
340 // The receiver used to be a top level frame | |
341 bool interpreter_frame_equals_unpacked_fp(intptr_t* fp); | |
342 | |
343 // Return/result value from this interpreter frame | |
344 // If the method return type is T_OBJECT or T_ARRAY populates oop_result | |
345 // For other (non-T_VOID) the appropriate field in the jvalue is populated | |
346 // with the result value. | |
347 // Should only be called when at method exit when the method is not | |
348 // exiting due to an exception. | |
349 BasicType interpreter_frame_result(oop* oop_result, jvalue* value_result); | |
350 | |
351 public: | |
352 // Method & constant pool cache | |
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353 Method* interpreter_frame_method() const; |
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354 void interpreter_frame_set_method(Method* method); |
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355 Method** interpreter_frame_method_addr() const; |
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356 ConstantPoolCache** interpreter_frame_cache_addr() const; |
0 | 357 |
358 public: | |
359 // Entry frames | |
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360 JavaCallWrapper* entry_frame_call_wrapper() const { return *entry_frame_call_wrapper_addr(); } |
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361 JavaCallWrapper* entry_frame_call_wrapper_if_safe(JavaThread* thread) const; |
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362 JavaCallWrapper** entry_frame_call_wrapper_addr() const; |
0 | 363 intptr_t* entry_frame_argument_at(int offset) const; |
364 | |
365 // tells whether there is another chunk of Delta stack above | |
366 bool entry_frame_is_first() const; | |
367 | |
368 // Compiled frames: | |
369 | |
370 public: | |
371 // Given the index of a local, and the number of argument words | |
372 // in this stack frame, tell which word of the stack frame to find | |
373 // the local in. Arguments are stored above the ofp/rpc pair, | |
374 // while other locals are stored below it. | |
375 // Since monitors (BasicLock blocks) are also assigned indexes, | |
376 // but may have different storage requirements, their presence | |
377 // can also affect the calculation of offsets. | |
378 static int local_offset_for_compiler(int local_index, int nof_args, int max_nof_locals, int max_nof_monitors); | |
379 | |
380 // Given the index of a monitor, etc., tell which word of the | |
381 // stack frame contains the start of the BasicLock block. | |
382 // Note that the local index by convention is the __higher__ | |
383 // of the two indexes allocated to the block. | |
384 static int monitor_offset_for_compiler(int local_index, int nof_args, int max_nof_locals, int max_nof_monitors); | |
385 | |
386 // Tell the smallest value that local_offset_for_compiler will attain. | |
387 // This is used to help determine how much stack frame to allocate. | |
388 static int min_local_offset_for_compiler(int nof_args, int max_nof_locals, int max_nof_monitors); | |
389 | |
390 // Tells if this register must be spilled during a call. | |
391 // On Intel, all registers are smashed by calls. | |
392 static bool volatile_across_calls(Register reg); | |
393 | |
394 | |
395 // Safepoints | |
396 | |
397 public: | |
398 oop saved_oop_result(RegisterMap* map) const; | |
399 void set_saved_oop_result(RegisterMap* map, oop obj); | |
400 | |
401 // For debugging | |
402 private: | |
403 const char* print_name() const; | |
404 | |
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405 void describe_pd(FrameValues& values, int frame_no); |
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406 |
0 | 407 public: |
408 void print_value() const { print_value_on(tty,NULL); } | |
409 void print_value_on(outputStream* st, JavaThread *thread) const; | |
410 void print_on(outputStream* st) const; | |
411 void interpreter_frame_print_on(outputStream* st) const; | |
412 void print_on_error(outputStream* st, char* buf, int buflen, bool verbose = false) const; | |
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413 static void print_C_frame(outputStream* st, char* buf, int buflen, address pc); |
0 | 414 |
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415 // Add annotated descriptions of memory locations belonging to this frame to values |
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416 void describe(FrameValues& values, int frame_no); |
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417 |
0 | 418 // Conversion from an VMReg to physical stack location |
419 oop* oopmapreg_to_location(VMReg reg, const RegisterMap* regmap) const; | |
420 | |
421 // Oops-do's | |
10390 | 422 void oops_compiled_arguments_do(Symbol* signature, bool has_receiver, bool has_appendix, const RegisterMap* reg_map, OopClosure* f); |
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423 void oops_interpreted_do(OopClosure* f, CLDClosure* cld_f, const RegisterMap* map, bool query_oop_map_cache = true); |
0 | 424 |
425 private: | |
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426 void oops_interpreted_arguments_do(Symbol* signature, bool has_receiver, OopClosure* f); |
0 | 427 |
428 // Iteration of oops | |
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429 void oops_do_internal(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf, RegisterMap* map, bool use_interpreter_oop_map_cache); |
0 | 430 void oops_entry_do(OopClosure* f, const RegisterMap* map); |
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431 void oops_code_blob_do(OopClosure* f, CodeBlobClosure* cf, const RegisterMap* map); |
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432 int adjust_offset(Method* method, int index); // helper for above fn |
0 | 433 public: |
434 // Memory management | |
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435 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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436 void nmethods_do(CodeBlobClosure* cf); |
0 | 437 |
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438 // RedefineClasses support for finding live interpreted methods on the stack |
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439 void metadata_do(void f(Metadata*)); |
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440 |
0 | 441 void gc_prologue(); |
442 void gc_epilogue(); | |
443 void pd_gc_epilog(); | |
444 | |
445 # ifdef ENABLE_ZAP_DEAD_LOCALS | |
446 private: | |
447 class CheckValueClosure: public OopClosure { | |
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448 public: |
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449 void do_oop(oop* p); |
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450 void do_oop(narrowOop* p) { ShouldNotReachHere(); } |
0 | 451 }; |
452 static CheckValueClosure _check_value; | |
453 | |
454 class CheckOopClosure: public OopClosure { | |
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455 public: |
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456 void do_oop(oop* p); |
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457 void do_oop(narrowOop* p) { ShouldNotReachHere(); } |
0 | 458 }; |
459 static CheckOopClosure _check_oop; | |
460 | |
461 static void check_derived_oop(oop* base, oop* derived); | |
462 | |
463 class ZapDeadClosure: public OopClosure { | |
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464 public: |
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465 void do_oop(oop* p); |
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466 void do_oop(narrowOop* p) { ShouldNotReachHere(); } |
0 | 467 }; |
468 static ZapDeadClosure _zap_dead; | |
469 | |
470 public: | |
471 // Zapping | |
472 void zap_dead_locals (JavaThread* thread, const RegisterMap* map); | |
473 void zap_dead_interpreted_locals(JavaThread* thread, const RegisterMap* map); | |
474 void zap_dead_compiled_locals (JavaThread* thread, const RegisterMap* map); | |
475 void zap_dead_entry_locals (JavaThread* thread, const RegisterMap* map); | |
476 void zap_dead_deoptimized_locals(JavaThread* thread, const RegisterMap* map); | |
477 # endif | |
478 // Verification | |
479 void verify(const RegisterMap* map); | |
480 static bool verify_return_pc(address x); | |
481 static bool is_bci(intptr_t bcx); | |
482 // Usage: | |
483 // assert(frame::verify_return_pc(return_address), "must be a return pc"); | |
484 | |
485 int pd_oop_map_offset_adjustment() const; | |
486 | |
1972 | 487 #ifdef TARGET_ARCH_x86 |
488 # include "frame_x86.hpp" | |
489 #endif | |
490 #ifdef TARGET_ARCH_sparc | |
491 # include "frame_sparc.hpp" | |
492 #endif | |
493 #ifdef TARGET_ARCH_zero | |
494 # include "frame_zero.hpp" | |
495 #endif | |
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496 #ifdef TARGET_ARCH_arm |
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497 # include "frame_arm.hpp" |
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498 #endif |
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499 #ifdef TARGET_ARCH_ppc |
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500 # include "frame_ppc.hpp" |
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501 #endif |
1972 | 502 |
0 | 503 }; |
504 | |
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505 #ifndef PRODUCT |
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506 // A simple class to describe a location on the stack |
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507 class FrameValue VALUE_OBJ_CLASS_SPEC { |
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508 public: |
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509 intptr_t* location; |
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510 char* description; |
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511 int owner; |
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512 int priority; |
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513 }; |
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514 |
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515 |
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516 // A collection of described stack values that can print a symbolic |
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517 // description of the stack memory. Interpreter frame values can be |
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518 // in the caller frames so all the values are collected first and then |
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519 // sorted before being printed. |
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520 class FrameValues { |
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521 private: |
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522 GrowableArray<FrameValue> _values; |
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523 |
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524 static int compare(FrameValue* a, FrameValue* b) { |
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525 if (a->location == b->location) { |
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526 return a->priority - b->priority; |
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527 } |
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528 return a->location - b->location; |
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529 } |
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530 |
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531 public: |
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532 // Used by frame functions to describe locations. |
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533 void describe(int owner, intptr_t* location, const char* description, int priority = 0); |
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534 |
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535 #ifdef ASSERT |
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536 void validate(); |
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537 #endif |
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538 void print(JavaThread* thread); |
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539 }; |
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540 |
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541 #endif |
0 | 542 |
543 // | |
544 // StackFrameStream iterates through the frames of a thread starting from | |
545 // top most frame. It automatically takes care of updating the location of | |
546 // all (callee-saved) registers. Notice: If a thread is stopped at | |
547 // a safepoint, all registers are saved, not only the callee-saved ones. | |
548 // | |
549 // Use: | |
550 // | |
551 // for(StackFrameStream fst(thread); !fst.is_done(); fst.next()) { | |
552 // ... | |
553 // } | |
554 // | |
555 class StackFrameStream : public StackObj { | |
556 private: | |
557 frame _fr; | |
558 RegisterMap _reg_map; | |
559 bool _is_done; | |
560 public: | |
561 StackFrameStream(JavaThread *thread, bool update = true); | |
562 | |
563 // Iteration | |
564 bool is_done() { return (_is_done) ? true : (_is_done = _fr.is_first_frame(), false); } | |
565 void next() { if (!_is_done) _fr = _fr.sender(&_reg_map); } | |
566 | |
567 // Query | |
568 frame *current() { return &_fr; } | |
569 RegisterMap* register_map() { return &_reg_map; } | |
570 }; | |
1972 | 571 |
572 #endif // SHARE_VM_RUNTIME_FRAME_HPP |