Mercurial > hg > truffle
annotate src/share/vm/runtime/frame.hpp @ 5117:b6d1ba51d163
minor changes
author | Christian Haeubl <christian.haeubl@oracle.com> |
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date | Mon, 19 Mar 2012 15:47:35 -0700 |
parents | 33df1aeaebbf |
children | 957c266d8bc5 |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2012, 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 | |
28 #include "asm/assembler.hpp" | |
29 #include "oops/methodOop.hpp" | |
30 #include "runtime/basicLock.hpp" | |
31 #include "runtime/monitorChunk.hpp" | |
32 #include "runtime/registerMap.hpp" | |
33 #include "utilities/top.hpp" | |
34 #ifdef COMPILER2 | |
35 #ifdef TARGET_ARCH_MODEL_x86_32 | |
36 # include "adfiles/adGlobals_x86_32.hpp" | |
37 #endif | |
38 #ifdef TARGET_ARCH_MODEL_x86_64 | |
39 # include "adfiles/adGlobals_x86_64.hpp" | |
40 #endif | |
41 #ifdef TARGET_ARCH_MODEL_sparc | |
42 # include "adfiles/adGlobals_sparc.hpp" | |
43 #endif | |
44 #ifdef TARGET_ARCH_MODEL_zero | |
45 # include "adfiles/adGlobals_zero.hpp" | |
46 #endif | |
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47 #ifdef TARGET_ARCH_MODEL_arm |
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48 # include "adfiles/adGlobals_arm.hpp" |
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49 #endif |
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50 #ifdef TARGET_ARCH_MODEL_ppc |
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51 # include "adfiles/adGlobals_ppc.hpp" |
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52 #endif |
1972 | 53 #endif |
54 #ifdef ZERO | |
55 #ifdef TARGET_ARCH_zero | |
56 # include "stack_zero.hpp" | |
57 #endif | |
58 #endif | |
59 | |
0 | 60 typedef class BytecodeInterpreter* interpreterState; |
61 | |
62 class CodeBlob; | |
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63 class FrameValues; |
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64 class vframeArray; |
0 | 65 |
66 | |
67 // A frame represents a physical stack frame (an activation). Frames | |
68 // can be C or Java frames, and the Java frames can be interpreted or | |
69 // compiled. In contrast, vframes represent source-level activations, | |
70 // so that one physical frame can correspond to multiple source level | |
71 // frames because of inlining. | |
72 | |
73 class frame VALUE_OBJ_CLASS_SPEC { | |
74 private: | |
75 // Instance variables: | |
76 intptr_t* _sp; // stack pointer (from Thread::last_Java_sp) | |
77 address _pc; // program counter (the next instruction after the call) | |
78 | |
79 CodeBlob* _cb; // CodeBlob that "owns" pc | |
80 enum deopt_state { | |
81 not_deoptimized, | |
82 is_deoptimized, | |
83 unknown | |
84 }; | |
85 | |
86 deopt_state _deopt_state; | |
87 | |
88 public: | |
89 // Constructors | |
90 frame(); | |
91 | |
92 // Accessors | |
93 | |
94 // pc: Returns the pc at which this frame will continue normally. | |
95 // It must point at the beginning of the next instruction to execute. | |
96 address pc() const { return _pc; } | |
97 | |
98 // This returns the pc that if you were in the debugger you'd see. Not | |
99 // the idealized value in the frame object. This undoes the magic conversion | |
100 // that happens for deoptimized frames. In addition it makes the value the | |
101 // hardware would want to see in the native frame. The only user (at this point) | |
102 // is deoptimization. It likely no one else should ever use it. | |
103 address raw_pc() const; | |
104 | |
105 void set_pc( address newpc ); | |
106 | |
107 intptr_t* sp() const { return _sp; } | |
108 void set_sp( intptr_t* newsp ) { _sp = newsp; } | |
109 | |
110 | |
111 CodeBlob* cb() const { return _cb; } | |
112 | |
113 // patching operations | |
114 void patch_pc(Thread* thread, address pc); | |
115 | |
116 // Every frame needs to return a unique id which distinguishes it from all other frames. | |
117 // For sparc and ia32 use sp. ia64 can have memory frames that are empty so multiple frames | |
118 // will have identical sp values. For ia64 the bsp (fp) value will serve. No real frame | |
119 // should have an id() of NULL so it is a distinguishing value for an unmatchable frame. | |
120 // We also have relationals which allow comparing a frame to anoth frame's id() allow | |
121 // us to distinguish younger (more recent activation) from older (less recent activations) | |
122 // A NULL id is only valid when comparing for equality. | |
123 | |
124 intptr_t* id(void) const; | |
125 bool is_younger(intptr_t* id) const; | |
126 bool is_older(intptr_t* id) const; | |
127 | |
128 // testers | |
129 | |
130 // Compares for strict equality. Rarely used or needed. | |
131 // It can return a different result than f1.id() == f2.id() | |
132 bool equal(frame other) const; | |
133 | |
134 // type testers | |
135 bool is_interpreted_frame() const; | |
136 bool is_java_frame() const; | |
137 bool is_entry_frame() const; // Java frame called from C? | |
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138 bool is_ricochet_frame() const; |
0 | 139 bool is_native_frame() const; |
140 bool is_runtime_frame() const; | |
141 bool is_compiled_frame() const; | |
142 bool is_safepoint_blob_frame() const; | |
143 bool is_deoptimized_frame() const; | |
144 | |
145 // testers | |
146 bool is_first_frame() const; // oldest frame? (has no sender) | |
147 bool is_first_java_frame() const; // same for Java frame | |
148 | |
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149 bool is_interpreted_frame_valid(JavaThread* thread) const; // performs sanity checks on interpreted frames. |
0 | 150 |
151 // tells whether this frame is marked for deoptimization | |
152 bool should_be_deoptimized() const; | |
153 | |
154 // tells whether this frame can be deoptimized | |
155 bool can_be_deoptimized() const; | |
156 | |
157 // returns the frame size in stack slots | |
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158 int frame_size(RegisterMap* map) const; |
0 | 159 |
160 // returns the sending frame | |
161 frame sender(RegisterMap* map) const; | |
162 | |
163 // for Profiling - acting on another frame. walks sender frames | |
164 // if valid. | |
165 frame profile_find_Java_sender_frame(JavaThread *thread); | |
166 bool safe_for_sender(JavaThread *thread); | |
167 | |
168 // returns the sender, but skips conversion frames | |
169 frame real_sender(RegisterMap* map) const; | |
170 | |
171 // returns the the sending Java frame, skipping any intermediate C frames | |
172 // NB: receiver must not be first frame | |
173 frame java_sender() const; | |
174 | |
175 private: | |
176 // Helper methods for better factored code in frame::sender | |
177 frame sender_for_compiled_frame(RegisterMap* map) const; | |
178 frame sender_for_entry_frame(RegisterMap* map) const; | |
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179 frame sender_for_ricochet_frame(RegisterMap* map) const; |
0 | 180 frame sender_for_interpreter_frame(RegisterMap* map) const; |
181 frame sender_for_native_frame(RegisterMap* map) const; | |
182 | |
183 // All frames: | |
184 | |
185 // A low-level interface for vframes: | |
186 | |
187 public: | |
188 | |
189 intptr_t* addr_at(int index) const { return &fp()[index]; } | |
190 intptr_t at(int index) const { return *addr_at(index); } | |
191 | |
192 // accessors for locals | |
193 oop obj_at(int offset) const { return *obj_at_addr(offset); } | |
194 void obj_at_put(int offset, oop value) { *obj_at_addr(offset) = value; } | |
195 | |
196 jint int_at(int offset) const { return *int_at_addr(offset); } | |
197 void int_at_put(int offset, jint value) { *int_at_addr(offset) = value; } | |
198 | |
199 oop* obj_at_addr(int offset) const { return (oop*) addr_at(offset); } | |
200 | |
201 oop* adjusted_obj_at_addr(methodOop method, int index) { return obj_at_addr(adjust_offset(method, index)); } | |
202 | |
203 private: | |
204 jint* int_at_addr(int offset) const { return (jint*) addr_at(offset); } | |
205 | |
206 public: | |
207 // Link (i.e., the pointer to the previous frame) | |
208 intptr_t* link() const; | |
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209 intptr_t** link_addr() const; |
0 | 210 void set_link(intptr_t* addr); |
211 | |
212 // Return address | |
213 address sender_pc() const; | |
214 | |
215 // Support for deoptimization | |
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216 void deoptimize(JavaThread* thread); |
0 | 217 |
218 // The frame's original SP, before any extension by an interpreted callee; | |
219 // used for packing debug info into vframeArray objects and vframeArray lookup. | |
220 intptr_t* unextended_sp() const; | |
221 | |
222 // returns the stack pointer of the calling frame | |
223 intptr_t* sender_sp() const; | |
224 | |
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225 // Returns the real 'frame pointer' for the current frame. |
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226 // This is the value expected by the platform ABI when it defines a |
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227 // frame pointer register. It may differ from the effective value of |
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228 // the FP register when that register is used in the JVM for other |
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229 // purposes (like compiled frames on some platforms). |
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230 // On other platforms, it is defined so that the stack area used by |
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231 // this frame goes from real_fp() to sp(). |
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232 intptr_t* real_fp() const; |
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233 |
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234 // Deoptimization info, if needed (platform dependent). |
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235 // Stored in the initial_info field of the unroll info, to be used by |
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236 // the platform dependent deoptimization blobs. |
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237 intptr_t *initial_deoptimization_info(); |
0 | 238 |
239 // Interpreter frames: | |
240 | |
241 private: | |
242 intptr_t** interpreter_frame_locals_addr() const; | |
243 intptr_t* interpreter_frame_bcx_addr() const; | |
244 intptr_t* interpreter_frame_mdx_addr() const; | |
245 | |
246 public: | |
247 // Locals | |
248 | |
249 // The _at version returns a pointer because the address is used for GC. | |
250 intptr_t* interpreter_frame_local_at(int index) const; | |
251 | |
252 void interpreter_frame_set_locals(intptr_t* locs); | |
253 | |
254 // byte code index/pointer (use these functions for unchecked frame access only!) | |
255 intptr_t interpreter_frame_bcx() const { return *interpreter_frame_bcx_addr(); } | |
256 void interpreter_frame_set_bcx(intptr_t bcx); | |
257 | |
258 // byte code index | |
259 jint interpreter_frame_bci() const; | |
260 void interpreter_frame_set_bci(jint bci); | |
261 | |
262 // byte code pointer | |
263 address interpreter_frame_bcp() const; | |
264 void interpreter_frame_set_bcp(address bcp); | |
265 | |
266 // Unchecked access to the method data index/pointer. | |
267 // Only use this if you know what you are doing. | |
268 intptr_t interpreter_frame_mdx() const { return *interpreter_frame_mdx_addr(); } | |
269 void interpreter_frame_set_mdx(intptr_t mdx); | |
270 | |
271 // method data pointer | |
272 address interpreter_frame_mdp() const; | |
273 void interpreter_frame_set_mdp(address dp); | |
274 | |
275 // Find receiver out of caller's (compiled) argument list | |
276 oop retrieve_receiver(RegisterMap *reg_map); | |
277 | |
278 // Return the monitor owner and BasicLock for compiled synchronized | |
279 // native methods so that biased locking can revoke the receiver's | |
2019 | 280 // bias if necessary. This is also used by JVMTI's GetLocalInstance method |
281 // (via VM_GetReceiver) to retrieve the receiver from a native wrapper frame. | |
282 BasicLock* get_native_monitor(); | |
283 oop get_native_receiver(); | |
0 | 284 |
285 // Find receiver for an invoke when arguments are just pushed on stack (i.e., callee stack-frame is | |
286 // not setup) | |
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287 oop interpreter_callee_receiver(Symbol* signature) { return *interpreter_callee_receiver_addr(signature); } |
0 | 288 |
289 | |
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290 oop* interpreter_callee_receiver_addr(Symbol* signature); |
0 | 291 |
292 | |
293 // expression stack (may go up or down, direction == 1 or -1) | |
294 public: | |
295 intptr_t* interpreter_frame_expression_stack() const; | |
296 static jint interpreter_frame_expression_stack_direction(); | |
297 | |
298 // The _at version returns a pointer because the address is used for GC. | |
299 intptr_t* interpreter_frame_expression_stack_at(jint offset) const; | |
300 | |
301 // top of expression stack | |
302 intptr_t* interpreter_frame_tos_at(jint offset) const; | |
303 intptr_t* interpreter_frame_tos_address() const; | |
304 | |
305 | |
306 jint interpreter_frame_expression_stack_size() const; | |
307 | |
308 intptr_t* interpreter_frame_sender_sp() const; | |
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309 intptr_t** interpreter_frame_sender_sp_addr() const; |
0 | 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 | |
317 // BasicObjectLocks: | |
318 // | |
319 // interpreter_frame_monitor_begin is higher in memory than interpreter_frame_monitor_end | |
320 // Interpreter_frame_monitor_begin points to one element beyond the oldest one, | |
321 // interpreter_frame_monitor_end points to the youngest one, or if there are none, | |
322 // it points to one beyond where the first element will be. | |
323 // interpreter_frame_monitor_size reports the allocation size of a monitor in the interpreter stack. | |
324 // this value is >= BasicObjectLock::size(), and may be rounded up | |
325 | |
326 BasicObjectLock* interpreter_frame_monitor_begin() const; | |
327 BasicObjectLock* interpreter_frame_monitor_end() const; | |
328 BasicObjectLock* next_monitor_in_interpreter_frame(BasicObjectLock* current) const; | |
329 BasicObjectLock* previous_monitor_in_interpreter_frame(BasicObjectLock* current) const; | |
330 static int interpreter_frame_monitor_size(); | |
331 | |
332 void interpreter_frame_verify_monitor(BasicObjectLock* value) const; | |
333 | |
334 // Tells whether the current interpreter_frame frame pointer | |
335 // corresponds to the old compiled/deoptimized fp | |
336 // The receiver used to be a top level frame | |
337 bool interpreter_frame_equals_unpacked_fp(intptr_t* fp); | |
338 | |
339 // Return/result value from this interpreter frame | |
340 // If the method return type is T_OBJECT or T_ARRAY populates oop_result | |
341 // For other (non-T_VOID) the appropriate field in the jvalue is populated | |
342 // with the result value. | |
343 // Should only be called when at method exit when the method is not | |
344 // exiting due to an exception. | |
345 BasicType interpreter_frame_result(oop* oop_result, jvalue* value_result); | |
346 | |
347 public: | |
348 // Method & constant pool cache | |
349 methodOop interpreter_frame_method() const; | |
350 void interpreter_frame_set_method(methodOop method); | |
351 methodOop* interpreter_frame_method_addr() const; | |
352 constantPoolCacheOop* interpreter_frame_cache_addr() const; | |
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353 #ifdef PPC |
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354 oop* interpreter_frame_mirror_addr() const; |
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355 #endif |
0 | 356 |
357 public: | |
358 // Entry frames | |
359 JavaCallWrapper* entry_frame_call_wrapper() const; | |
360 intptr_t* entry_frame_argument_at(int offset) const; | |
361 | |
362 // tells whether there is another chunk of Delta stack above | |
363 bool entry_frame_is_first() const; | |
364 | |
365 // Compiled frames: | |
366 | |
367 public: | |
368 // Given the index of a local, and the number of argument words | |
369 // in this stack frame, tell which word of the stack frame to find | |
370 // the local in. Arguments are stored above the ofp/rpc pair, | |
371 // while other locals are stored below it. | |
372 // Since monitors (BasicLock blocks) are also assigned indexes, | |
373 // but may have different storage requirements, their presence | |
374 // can also affect the calculation of offsets. | |
375 static int local_offset_for_compiler(int local_index, int nof_args, int max_nof_locals, int max_nof_monitors); | |
376 | |
377 // Given the index of a monitor, etc., tell which word of the | |
378 // stack frame contains the start of the BasicLock block. | |
379 // Note that the local index by convention is the __higher__ | |
380 // of the two indexes allocated to the block. | |
381 static int monitor_offset_for_compiler(int local_index, int nof_args, int max_nof_locals, int max_nof_monitors); | |
382 | |
383 // Tell the smallest value that local_offset_for_compiler will attain. | |
384 // This is used to help determine how much stack frame to allocate. | |
385 static int min_local_offset_for_compiler(int nof_args, int max_nof_locals, int max_nof_monitors); | |
386 | |
387 // Tells if this register must be spilled during a call. | |
388 // On Intel, all registers are smashed by calls. | |
389 static bool volatile_across_calls(Register reg); | |
390 | |
391 | |
392 // Safepoints | |
393 | |
394 public: | |
395 oop saved_oop_result(RegisterMap* map) const; | |
396 void set_saved_oop_result(RegisterMap* map, oop obj); | |
397 | |
398 // For debugging | |
399 private: | |
400 const char* print_name() const; | |
401 | |
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402 void describe_pd(FrameValues& values, int frame_no); |
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403 |
0 | 404 public: |
405 void print_value() const { print_value_on(tty,NULL); } | |
406 void print_value_on(outputStream* st, JavaThread *thread) const; | |
407 void print_on(outputStream* st) const; | |
408 void interpreter_frame_print_on(outputStream* st) const; | |
409 void print_on_error(outputStream* st, char* buf, int buflen, bool verbose = false) const; | |
410 | |
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411 // Add annotated descriptions of memory locations belonging to this frame to values |
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412 void describe(FrameValues& values, int frame_no); |
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413 |
0 | 414 // Conversion from an VMReg to physical stack location |
415 oop* oopmapreg_to_location(VMReg reg, const RegisterMap* regmap) const; | |
416 | |
417 // Oops-do's | |
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418 void oops_compiled_arguments_do(Symbol* signature, bool has_receiver, const RegisterMap* reg_map, OopClosure* f); |
0 | 419 void oops_interpreted_do(OopClosure* f, const RegisterMap* map, bool query_oop_map_cache = true); |
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420 void oops_ricochet_do(OopClosure* f, const RegisterMap* map); |
0 | 421 |
422 private: | |
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423 void oops_interpreted_arguments_do(Symbol* signature, bool has_receiver, OopClosure* f); |
0 | 424 |
425 // Iteration of oops | |
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426 void oops_do_internal(OopClosure* f, CodeBlobClosure* cf, RegisterMap* map, bool use_interpreter_oop_map_cache); |
0 | 427 void oops_entry_do(OopClosure* f, const RegisterMap* map); |
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428 void oops_code_blob_do(OopClosure* f, CodeBlobClosure* cf, const RegisterMap* map); |
0 | 429 int adjust_offset(methodOop method, int index); // helper for above fn |
430 public: | |
431 // Memory management | |
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432 void oops_do(OopClosure* f, CodeBlobClosure* cf, RegisterMap* map) { oops_do_internal(f, cf, map, true); } |
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433 void nmethods_do(CodeBlobClosure* cf); |
0 | 434 |
435 void gc_prologue(); | |
436 void gc_epilogue(); | |
437 void pd_gc_epilog(); | |
438 | |
439 # ifdef ENABLE_ZAP_DEAD_LOCALS | |
440 private: | |
441 class CheckValueClosure: public OopClosure { | |
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442 public: |
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443 void do_oop(oop* p); |
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444 void do_oop(narrowOop* p) { ShouldNotReachHere(); } |
0 | 445 }; |
446 static CheckValueClosure _check_value; | |
447 | |
448 class CheckOopClosure: public OopClosure { | |
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449 public: |
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450 void do_oop(oop* p); |
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451 void do_oop(narrowOop* p) { ShouldNotReachHere(); } |
0 | 452 }; |
453 static CheckOopClosure _check_oop; | |
454 | |
455 static void check_derived_oop(oop* base, oop* derived); | |
456 | |
457 class ZapDeadClosure: public OopClosure { | |
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458 public: |
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459 void do_oop(oop* p); |
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460 void do_oop(narrowOop* p) { ShouldNotReachHere(); } |
0 | 461 }; |
462 static ZapDeadClosure _zap_dead; | |
463 | |
464 public: | |
465 // Zapping | |
466 void zap_dead_locals (JavaThread* thread, const RegisterMap* map); | |
467 void zap_dead_interpreted_locals(JavaThread* thread, const RegisterMap* map); | |
468 void zap_dead_compiled_locals (JavaThread* thread, const RegisterMap* map); | |
469 void zap_dead_entry_locals (JavaThread* thread, const RegisterMap* map); | |
470 void zap_dead_deoptimized_locals(JavaThread* thread, const RegisterMap* map); | |
471 # endif | |
472 // Verification | |
473 void verify(const RegisterMap* map); | |
474 static bool verify_return_pc(address x); | |
475 static bool is_bci(intptr_t bcx); | |
476 // Usage: | |
477 // assert(frame::verify_return_pc(return_address), "must be a return pc"); | |
478 | |
479 int pd_oop_map_offset_adjustment() const; | |
480 | |
1972 | 481 #ifdef TARGET_ARCH_x86 |
482 # include "frame_x86.hpp" | |
483 #endif | |
484 #ifdef TARGET_ARCH_sparc | |
485 # include "frame_sparc.hpp" | |
486 #endif | |
487 #ifdef TARGET_ARCH_zero | |
488 # include "frame_zero.hpp" | |
489 #endif | |
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490 #ifdef TARGET_ARCH_arm |
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491 # include "frame_arm.hpp" |
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492 #endif |
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493 #ifdef TARGET_ARCH_ppc |
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494 # include "frame_ppc.hpp" |
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495 #endif |
1972 | 496 |
0 | 497 }; |
498 | |
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499 #ifndef PRODUCT |
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500 // A simple class to describe a location on the stack |
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501 class FrameValue VALUE_OBJ_CLASS_SPEC { |
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502 public: |
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503 intptr_t* location; |
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504 char* description; |
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505 int owner; |
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506 int priority; |
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507 }; |
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508 |
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509 |
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510 // A collection of described stack values that can print a symbolic |
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511 // description of the stack memory. Interpreter frame values can be |
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512 // in the caller frames so all the values are collected first and then |
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513 // sorted before being printed. |
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514 class FrameValues { |
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515 private: |
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516 GrowableArray<FrameValue> _values; |
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517 |
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518 static int compare(FrameValue* a, FrameValue* b) { |
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519 if (a->location == b->location) { |
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520 return a->priority - b->priority; |
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521 } |
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522 return a->location - b->location; |
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523 } |
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524 |
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525 public: |
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526 // Used by frame functions to describe locations. |
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527 void describe(int owner, intptr_t* location, const char* description, int priority = 0); |
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528 |
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529 #ifdef ASSERT |
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530 void validate(); |
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531 #endif |
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532 void print(JavaThread* thread); |
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533 }; |
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534 |
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535 #endif |
0 | 536 |
537 // | |
538 // StackFrameStream iterates through the frames of a thread starting from | |
539 // top most frame. It automatically takes care of updating the location of | |
540 // all (callee-saved) registers. Notice: If a thread is stopped at | |
541 // a safepoint, all registers are saved, not only the callee-saved ones. | |
542 // | |
543 // Use: | |
544 // | |
545 // for(StackFrameStream fst(thread); !fst.is_done(); fst.next()) { | |
546 // ... | |
547 // } | |
548 // | |
549 class StackFrameStream : public StackObj { | |
550 private: | |
551 frame _fr; | |
552 RegisterMap _reg_map; | |
553 bool _is_done; | |
554 public: | |
555 StackFrameStream(JavaThread *thread, bool update = true); | |
556 | |
557 // Iteration | |
558 bool is_done() { return (_is_done) ? true : (_is_done = _fr.is_first_frame(), false); } | |
559 void next() { if (!_is_done) _fr = _fr.sender(&_reg_map); } | |
560 | |
561 // Query | |
562 frame *current() { return &_fr; } | |
563 RegisterMap* register_map() { return &_reg_map; } | |
564 }; | |
1972 | 565 |
566 #endif // SHARE_VM_RUNTIME_FRAME_HPP |