Sun, 10 Feb 2013 22:35:38 -0800
8006430: TraceTypeProfile is a product flag while it should be a diagnostic flag
Summary: make sure all diagnostic and experimental flag kinds are checked in Flag::is_unlocked()
Reviewed-by: kvn
1 /*
2 * Copyright (c) 1997, 2012, 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 */
25 #ifndef SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP
26 #define SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP
28 #include "interpreter/bytecodeHistogram.hpp"
29 #include "interpreter/bytecodeTracer.hpp"
30 #include "interpreter/linkResolver.hpp"
31 #include "memory/allocation.hpp"
32 #include "memory/resourceArea.hpp"
33 #include "runtime/threadLocalStorage.hpp"
34 #include "utilities/hashtable.hpp"
35 #include "utilities/macros.hpp"
37 class AdapterHandlerEntry;
38 class AdapterHandlerTable;
39 class AdapterFingerPrint;
40 class vframeStream;
42 // Runtime is the base class for various runtime interfaces
43 // (InterpreterRuntime, CompilerRuntime, etc.). It provides
44 // shared functionality such as exception forwarding (C++ to
45 // Java exceptions), locking/unlocking mechanisms, statistical
46 // information, etc.
48 class SharedRuntime: AllStatic {
49 friend class VMStructs;
51 private:
52 static methodHandle resolve_sub_helper(JavaThread *thread,
53 bool is_virtual,
54 bool is_optimized, TRAPS);
56 // Shared stub locations
58 static RuntimeStub* _wrong_method_blob;
59 static RuntimeStub* _ic_miss_blob;
60 static RuntimeStub* _resolve_opt_virtual_call_blob;
61 static RuntimeStub* _resolve_virtual_call_blob;
62 static RuntimeStub* _resolve_static_call_blob;
64 static DeoptimizationBlob* _deopt_blob;
66 static SafepointBlob* _polling_page_vectors_safepoint_handler_blob;
67 static SafepointBlob* _polling_page_safepoint_handler_blob;
68 static SafepointBlob* _polling_page_return_handler_blob;
70 #ifdef COMPILER2
71 static UncommonTrapBlob* _uncommon_trap_blob;
72 #endif // COMPILER2
74 #ifndef PRODUCT
75 // Counters
76 static int _nof_megamorphic_calls; // total # of megamorphic calls (through vtable)
77 #endif // !PRODUCT
79 private:
80 enum { POLL_AT_RETURN, POLL_AT_LOOP, POLL_AT_VECTOR_LOOP };
81 static SafepointBlob* generate_handler_blob(address call_ptr, int poll_type);
82 static RuntimeStub* generate_resolve_blob(address destination, const char* name);
84 public:
85 static void generate_stubs(void);
87 // max bytes for each dtrace string parameter
88 enum { max_dtrace_string_size = 256 };
90 // The following arithmetic routines are used on platforms that do
91 // not have machine instructions to implement their functionality.
92 // Do not remove these.
94 // long arithmetics
95 static jlong lmul(jlong y, jlong x);
96 static jlong ldiv(jlong y, jlong x);
97 static jlong lrem(jlong y, jlong x);
99 // float and double remainder
100 static jfloat frem(jfloat x, jfloat y);
101 static jdouble drem(jdouble x, jdouble y);
103 #ifdef __SOFTFP__
104 static jfloat fadd(jfloat x, jfloat y);
105 static jfloat fsub(jfloat x, jfloat y);
106 static jfloat fmul(jfloat x, jfloat y);
107 static jfloat fdiv(jfloat x, jfloat y);
109 static jdouble dadd(jdouble x, jdouble y);
110 static jdouble dsub(jdouble x, jdouble y);
111 static jdouble dmul(jdouble x, jdouble y);
112 static jdouble ddiv(jdouble x, jdouble y);
113 #endif // __SOFTFP__
115 // float conversion (needs to set appropriate rounding mode)
116 static jint f2i (jfloat x);
117 static jlong f2l (jfloat x);
118 static jint d2i (jdouble x);
119 static jlong d2l (jdouble x);
120 static jfloat d2f (jdouble x);
121 static jfloat l2f (jlong x);
122 static jdouble l2d (jlong x);
124 #ifdef __SOFTFP__
125 static jfloat i2f (jint x);
126 static jdouble i2d (jint x);
127 static jdouble f2d (jfloat x);
128 #endif // __SOFTFP__
130 // double trigonometrics and transcendentals
131 static jdouble dsin(jdouble x);
132 static jdouble dcos(jdouble x);
133 static jdouble dtan(jdouble x);
134 static jdouble dlog(jdouble x);
135 static jdouble dlog10(jdouble x);
136 static jdouble dexp(jdouble x);
137 static jdouble dpow(jdouble x, jdouble y);
139 #if defined(__SOFTFP__) || defined(E500V2)
140 static double dabs(double f);
141 #endif
143 #if defined(__SOFTFP__) || defined(PPC)
144 static double dsqrt(double f);
145 #endif
147 #ifdef __SOFTFP__
148 // C++ compiler generates soft float instructions as well as passing
149 // float and double in registers.
150 static int fcmpl(float x, float y);
151 static int fcmpg(float x, float y);
152 static int dcmpl(double x, double y);
153 static int dcmpg(double x, double y);
155 static int unordered_fcmplt(float x, float y);
156 static int unordered_dcmplt(double x, double y);
157 static int unordered_fcmple(float x, float y);
158 static int unordered_dcmple(double x, double y);
159 static int unordered_fcmpge(float x, float y);
160 static int unordered_dcmpge(double x, double y);
161 static int unordered_fcmpgt(float x, float y);
162 static int unordered_dcmpgt(double x, double y);
164 static float fneg(float f);
165 static double dneg(double f);
166 #endif
168 // exception handling across interpreter/compiler boundaries
169 static address raw_exception_handler_for_return_address(JavaThread* thread, address return_address);
170 static address exception_handler_for_return_address(JavaThread* thread, address return_address);
172 #if INCLUDE_ALL_GCS
173 // G1 write barriers
174 static void g1_wb_pre(oopDesc* orig, JavaThread *thread);
175 static void g1_wb_post(void* card_addr, JavaThread* thread);
176 #endif // INCLUDE_ALL_GCS
178 // exception handling and implicit exceptions
179 static address compute_compiled_exc_handler(nmethod* nm, address ret_pc, Handle& exception,
180 bool force_unwind, bool top_frame_only);
181 enum ImplicitExceptionKind {
182 IMPLICIT_NULL,
183 IMPLICIT_DIVIDE_BY_ZERO,
184 STACK_OVERFLOW
185 };
186 static void throw_AbstractMethodError(JavaThread* thread);
187 static void throw_IncompatibleClassChangeError(JavaThread* thread);
188 static void throw_ArithmeticException(JavaThread* thread);
189 static void throw_NullPointerException(JavaThread* thread);
190 static void throw_NullPointerException_at_call(JavaThread* thread);
191 static void throw_StackOverflowError(JavaThread* thread);
192 static address continuation_for_implicit_exception(JavaThread* thread,
193 address faulting_pc,
194 ImplicitExceptionKind exception_kind);
196 // Shared stub locations
197 static address get_poll_stub(address pc);
199 static address get_ic_miss_stub() {
200 assert(_ic_miss_blob!= NULL, "oops");
201 return _ic_miss_blob->entry_point();
202 }
204 static address get_handle_wrong_method_stub() {
205 assert(_wrong_method_blob!= NULL, "oops");
206 return _wrong_method_blob->entry_point();
207 }
209 #ifdef COMPILER2
210 static void generate_uncommon_trap_blob(void);
211 static UncommonTrapBlob* uncommon_trap_blob() { return _uncommon_trap_blob; }
212 #endif // COMPILER2
214 static address get_resolve_opt_virtual_call_stub(){
215 assert(_resolve_opt_virtual_call_blob != NULL, "oops");
216 return _resolve_opt_virtual_call_blob->entry_point();
217 }
218 static address get_resolve_virtual_call_stub() {
219 assert(_resolve_virtual_call_blob != NULL, "oops");
220 return _resolve_virtual_call_blob->entry_point();
221 }
222 static address get_resolve_static_call_stub() {
223 assert(_resolve_static_call_blob != NULL, "oops");
224 return _resolve_static_call_blob->entry_point();
225 }
227 static SafepointBlob* polling_page_return_handler_blob() { return _polling_page_return_handler_blob; }
228 static SafepointBlob* polling_page_safepoint_handler_blob() { return _polling_page_safepoint_handler_blob; }
229 static SafepointBlob* polling_page_vectors_safepoint_handler_blob() { return _polling_page_vectors_safepoint_handler_blob; }
231 // Counters
232 #ifndef PRODUCT
233 static address nof_megamorphic_calls_addr() { return (address)&_nof_megamorphic_calls; }
234 #endif // PRODUCT
236 // Helper routine for full-speed JVMTI exception throwing support
237 static void throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception);
238 static void throw_and_post_jvmti_exception(JavaThread *thread, Symbol* name, const char *message = NULL);
240 // RedefineClasses() tracing support for obsolete method entry
241 static int rc_trace_method_entry(JavaThread* thread, Method* m);
243 // To be used as the entry point for unresolved native methods.
244 static address native_method_throw_unsatisfied_link_error_entry();
245 static address native_method_throw_unsupported_operation_exception_entry();
247 // bytecode tracing is only used by the TraceBytecodes
248 static intptr_t trace_bytecode(JavaThread* thread, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2) PRODUCT_RETURN0;
250 // Used to back off a spin lock that is under heavy contention
251 static void yield_all(JavaThread* thread, int attempts = 0);
253 static oop retrieve_receiver( Symbol* sig, frame caller );
255 static void register_finalizer(JavaThread* thread, oopDesc* obj);
257 // dtrace notifications
258 static int dtrace_object_alloc(oopDesc* o);
259 static int dtrace_object_alloc_base(Thread* thread, oopDesc* o);
260 static int dtrace_method_entry(JavaThread* thread, Method* m);
261 static int dtrace_method_exit(JavaThread* thread, Method* m);
263 // Utility method for retrieving the Java thread id, returns 0 if the
264 // thread is not a well formed Java thread.
265 static jlong get_java_tid(Thread* thread);
268 // used by native wrappers to reenable yellow if overflow happened in native code
269 static void reguard_yellow_pages();
271 /**
272 * Fill in the "X cannot be cast to a Y" message for ClassCastException
273 *
274 * @param thr the current thread
275 * @param name the name of the class of the object attempted to be cast
276 * @return the dynamically allocated exception message (must be freed
277 * by the caller using a resource mark)
278 *
279 * BCP must refer to the current 'checkcast' opcode for the frame
280 * on top of the stack.
281 * The caller (or one of it's callers) must use a ResourceMark
282 * in order to correctly free the result.
283 */
284 static char* generate_class_cast_message(JavaThread* thr, const char* name);
286 /**
287 * Fill in the "X cannot be cast to a Y" message for ClassCastException
288 *
289 * @param name the name of the class of the object attempted to be cast
290 * @param klass the name of the target klass attempt
291 * @param gripe the specific kind of problem being reported
292 * @return the dynamically allocated exception message (must be freed
293 * by the caller using a resource mark)
294 *
295 * This version does not require access the frame, so it can be called
296 * from interpreted code
297 * The caller (or one of it's callers) must use a ResourceMark
298 * in order to correctly free the result.
299 */
300 static char* generate_class_cast_message(const char* name, const char* klass,
301 const char* gripe = " cannot be cast to ");
303 // Resolves a call site- may patch in the destination of the call into the
304 // compiled code.
305 static methodHandle resolve_helper(JavaThread *thread,
306 bool is_virtual,
307 bool is_optimized, TRAPS);
309 private:
310 // deopt blob
311 static void generate_deopt_blob(void);
313 public:
314 static DeoptimizationBlob* deopt_blob(void) { return _deopt_blob; }
316 // Resets a call-site in compiled code so it will get resolved again.
317 static methodHandle reresolve_call_site(JavaThread *thread, TRAPS);
319 // In the code prolog, if the klass comparison fails, the inline cache
320 // misses and the call site is patched to megamorphic
321 static methodHandle handle_ic_miss_helper(JavaThread* thread, TRAPS);
323 // Find the method that called us.
324 static methodHandle find_callee_method(JavaThread* thread, TRAPS);
327 private:
328 static Handle find_callee_info(JavaThread* thread,
329 Bytecodes::Code& bc,
330 CallInfo& callinfo, TRAPS);
331 static Handle find_callee_info_helper(JavaThread* thread,
332 vframeStream& vfst,
333 Bytecodes::Code& bc,
334 CallInfo& callinfo, TRAPS);
336 static address clean_virtual_call_entry();
337 static address clean_opt_virtual_call_entry();
338 static address clean_static_call_entry();
340 public:
342 // Read the array of BasicTypes from a Java signature, and compute where
343 // compiled Java code would like to put the results. Values in reg_lo and
344 // reg_hi refer to 4-byte quantities. Values less than SharedInfo::stack0 are
345 // registers, those above refer to 4-byte stack slots. All stack slots are
346 // based off of the window top. SharedInfo::stack0 refers to the first usable
347 // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word
348 // 4-bytes higher. So for sparc because the register window save area is at
349 // the bottom of the frame the first 16 words will be skipped and SharedInfo::stack0
350 // will be just above it. (
351 // return value is the maximum number of VMReg stack slots the convention will use.
352 static int java_calling_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed, int is_outgoing);
354 static void check_member_name_argument_is_last_argument(methodHandle method,
355 const BasicType* sig_bt,
356 const VMRegPair* regs) NOT_DEBUG_RETURN;
358 // Ditto except for calling C
359 static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, int total_args_passed);
361 // Generate I2C and C2I adapters. These adapters are simple argument marshalling
362 // blobs. Unlike adapters in the tiger and earlier releases the code in these
363 // blobs does not create a new frame and are therefore virtually invisible
364 // to the stack walking code. In general these blobs extend the callers stack
365 // as needed for the conversion of argument locations.
367 // When calling a c2i blob the code will always call the interpreter even if
368 // by the time we reach the blob there is compiled code available. This allows
369 // the blob to pass the incoming stack pointer (the sender sp) in a known
370 // location for the interpreter to record. This is used by the frame code
371 // to correct the sender code to match up with the stack pointer when the
372 // thread left the compiled code. In addition it allows the interpreter
373 // to remove the space the c2i adapter allocated to do it argument conversion.
375 // Although a c2i blob will always run interpreted even if compiled code is
376 // present if we see that compiled code is present the compiled call site
377 // will be patched/re-resolved so that later calls will run compiled.
379 // Aditionally a c2i blob need to have a unverified entry because it can be reached
380 // in situations where the call site is an inlined cache site and may go megamorphic.
382 // A i2c adapter is simpler than the c2i adapter. This is because it is assumed
383 // that the interpreter before it does any call dispatch will record the current
384 // stack pointer in the interpreter frame. On return it will restore the stack
385 // pointer as needed. This means the i2c adapter code doesn't need any special
386 // handshaking path with compiled code to keep the stack walking correct.
388 static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *_masm,
389 int total_args_passed,
390 int max_arg,
391 const BasicType *sig_bt,
392 const VMRegPair *regs,
393 AdapterFingerPrint* fingerprint);
395 // OSR support
397 // OSR_migration_begin will extract the jvm state from an interpreter
398 // frame (locals, monitors) and store the data in a piece of C heap
399 // storage. This then allows the interpreter frame to be removed from the
400 // stack and the OSR nmethod to be called. That method is called with a
401 // pointer to the C heap storage. This pointer is the return value from
402 // OSR_migration_begin.
404 static intptr_t* OSR_migration_begin( JavaThread *thread);
406 // OSR_migration_end is a trivial routine. It is called after the compiled
407 // method has extracted the jvm state from the C heap that OSR_migration_begin
408 // created. It's entire job is to simply free this storage.
409 static void OSR_migration_end ( intptr_t* buf);
411 // Convert a sig into a calling convention register layout
412 // and find interesting things about it.
413 static VMRegPair* find_callee_arguments(Symbol* sig, bool has_receiver, int *arg_size);
414 static VMReg name_for_receiver();
416 // "Top of Stack" slots that may be unused by the calling convention but must
417 // otherwise be preserved.
418 // On Intel these are not necessary and the value can be zero.
419 // On Sparc this describes the words reserved for storing a register window
420 // when an interrupt occurs.
421 static uint out_preserve_stack_slots();
423 // Is vector's size (in bytes) bigger than a size saved by default?
424 // For example, on x86 16 bytes XMM registers are saved by default.
425 static bool is_wide_vector(int size);
427 // Save and restore a native result
428 static void save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots );
429 static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots );
431 // Generate a native wrapper for a given method. The method takes arguments
432 // in the Java compiled code convention, marshals them to the native
433 // convention (handlizes oops, etc), transitions to native, makes the call,
434 // returns to java state (possibly blocking), unhandlizes any result and
435 // returns.
436 //
437 // The wrapper may contain special-case code if the given method
438 // is a JNI critical method, or a compiled method handle adapter,
439 // such as _invokeBasic, _linkToVirtual, etc.
440 static nmethod* generate_native_wrapper(MacroAssembler* masm,
441 methodHandle method,
442 int compile_id,
443 BasicType* sig_bt,
444 VMRegPair* regs,
445 BasicType ret_type );
447 // Block before entering a JNI critical method
448 static void block_for_jni_critical(JavaThread* thread);
450 #ifdef HAVE_DTRACE_H
451 // Generate a dtrace wrapper for a given method. The method takes arguments
452 // in the Java compiled code convention, marshals them to the native
453 // convention (handlizes oops, etc), transitions to native, makes the call,
454 // returns to java state (possibly blocking), unhandlizes any result and
455 // returns.
456 static nmethod *generate_dtrace_nmethod(MacroAssembler* masm,
457 methodHandle method);
459 // dtrace support to convert a Java string to utf8
460 static void get_utf(oopDesc* src, address dst);
461 #endif // def HAVE_DTRACE_H
463 // A compiled caller has just called the interpreter, but compiled code
464 // exists. Patch the caller so he no longer calls into the interpreter.
465 static void fixup_callers_callsite(Method* moop, address ret_pc);
467 // Slow-path Locking and Unlocking
468 static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread);
469 static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock);
471 // Resolving of calls
472 static address resolve_static_call_C (JavaThread *thread);
473 static address resolve_virtual_call_C (JavaThread *thread);
474 static address resolve_opt_virtual_call_C(JavaThread *thread);
476 // arraycopy, the non-leaf version. (See StubRoutines for all the leaf calls.)
477 static void slow_arraycopy_C(oopDesc* src, jint src_pos,
478 oopDesc* dest, jint dest_pos,
479 jint length, JavaThread* thread);
481 // handle ic miss with caller being compiled code
482 // wrong method handling (inline cache misses, zombie methods)
483 static address handle_wrong_method(JavaThread* thread);
484 static address handle_wrong_method_ic_miss(JavaThread* thread);
486 #ifndef PRODUCT
488 // Collect and print inline cache miss statistics
489 private:
490 enum { maxICmiss_count = 100 };
491 static int _ICmiss_index; // length of IC miss histogram
492 static int _ICmiss_count[maxICmiss_count]; // miss counts
493 static address _ICmiss_at[maxICmiss_count]; // miss addresses
494 static void trace_ic_miss(address at);
496 public:
497 static int _monitor_enter_ctr; // monitor enter slow
498 static int _monitor_exit_ctr; // monitor exit slow
499 static int _throw_null_ctr; // throwing a null-pointer exception
500 static int _ic_miss_ctr; // total # of IC misses
501 static int _wrong_method_ctr;
502 static int _resolve_static_ctr;
503 static int _resolve_virtual_ctr;
504 static int _resolve_opt_virtual_ctr;
505 static int _implicit_null_throws;
506 static int _implicit_div0_throws;
508 static int _jbyte_array_copy_ctr; // Slow-path byte array copy
509 static int _jshort_array_copy_ctr; // Slow-path short array copy
510 static int _jint_array_copy_ctr; // Slow-path int array copy
511 static int _jlong_array_copy_ctr; // Slow-path long array copy
512 static int _oop_array_copy_ctr; // Slow-path oop array copy
513 static int _checkcast_array_copy_ctr; // Slow-path oop array copy, with cast
514 static int _unsafe_array_copy_ctr; // Slow-path includes alignment checks
515 static int _generic_array_copy_ctr; // Slow-path includes type decoding
516 static int _slow_array_copy_ctr; // Slow-path failed out to a method call
518 static int _new_instance_ctr; // 'new' object requires GC
519 static int _new_array_ctr; // 'new' array requires GC
520 static int _multi1_ctr, _multi2_ctr, _multi3_ctr, _multi4_ctr, _multi5_ctr;
521 static int _find_handler_ctr; // find exception handler
522 static int _rethrow_ctr; // rethrow exception
523 static int _mon_enter_stub_ctr; // monitor enter stub
524 static int _mon_exit_stub_ctr; // monitor exit stub
525 static int _mon_enter_ctr; // monitor enter slow
526 static int _mon_exit_ctr; // monitor exit slow
527 static int _partial_subtype_ctr; // SubRoutines::partial_subtype_check
529 // Statistics code
530 // stats for "normal" compiled calls (non-interface)
531 static int _nof_normal_calls; // total # of calls
532 static int _nof_optimized_calls; // total # of statically-bound calls
533 static int _nof_inlined_calls; // total # of inlined normal calls
534 static int _nof_static_calls; // total # of calls to static methods or super methods (invokespecial)
535 static int _nof_inlined_static_calls; // total # of inlined static calls
536 // stats for compiled interface calls
537 static int _nof_interface_calls; // total # of compiled calls
538 static int _nof_optimized_interface_calls; // total # of statically-bound interface calls
539 static int _nof_inlined_interface_calls; // total # of inlined interface calls
540 static int _nof_megamorphic_interface_calls;// total # of megamorphic interface calls
541 // stats for runtime exceptions
542 static int _nof_removable_exceptions; // total # of exceptions that could be replaced by branches due to inlining
544 public: // for compiler
545 static address nof_normal_calls_addr() { return (address)&_nof_normal_calls; }
546 static address nof_optimized_calls_addr() { return (address)&_nof_optimized_calls; }
547 static address nof_inlined_calls_addr() { return (address)&_nof_inlined_calls; }
548 static address nof_static_calls_addr() { return (address)&_nof_static_calls; }
549 static address nof_inlined_static_calls_addr() { return (address)&_nof_inlined_static_calls; }
550 static address nof_interface_calls_addr() { return (address)&_nof_interface_calls; }
551 static address nof_optimized_interface_calls_addr() { return (address)&_nof_optimized_interface_calls; }
552 static address nof_inlined_interface_calls_addr() { return (address)&_nof_inlined_interface_calls; }
553 static address nof_megamorphic_interface_calls_addr() { return (address)&_nof_megamorphic_interface_calls; }
554 static void print_call_statistics(int comp_total);
555 static void print_statistics();
556 static void print_ic_miss_histogram();
558 #endif // PRODUCT
559 };
562 // ---------------------------------------------------------------------------
563 // Implementation of AdapterHandlerLibrary
564 //
565 // This library manages argument marshaling adapters and native wrappers.
566 // There are 2 flavors of adapters: I2C and C2I.
567 //
568 // The I2C flavor takes a stock interpreted call setup, marshals the
569 // arguments for a Java-compiled call, and jumps to Rmethod-> code()->
570 // code_begin(). It is broken to call it without an nmethod assigned.
571 // The usual behavior is to lift any register arguments up out of the
572 // stack and possibly re-pack the extra arguments to be contigious.
573 // I2C adapters will save what the interpreter's stack pointer will be
574 // after arguments are popped, then adjust the interpreter's frame
575 // size to force alignment and possibly to repack the arguments.
576 // After re-packing, it jumps to the compiled code start. There are
577 // no safepoints in this adapter code and a GC cannot happen while
578 // marshaling is in progress.
579 //
580 // The C2I flavor takes a stock compiled call setup plus the target method in
581 // Rmethod, marshals the arguments for an interpreted call and jumps to
582 // Rmethod->_i2i_entry. On entry, the interpreted frame has not yet been
583 // setup. Compiled frames are fixed-size and the args are likely not in the
584 // right place. Hence all the args will likely be copied into the
585 // interpreter's frame, forcing that frame to grow. The compiled frame's
586 // outgoing stack args will be dead after the copy.
587 //
588 // Native wrappers, like adapters, marshal arguments. Unlike adapters they
589 // also perform an offical frame push & pop. They have a call to the native
590 // routine in their middles and end in a return (instead of ending in a jump).
591 // The native wrappers are stored in real nmethods instead of the BufferBlobs
592 // used by the adapters. The code generation happens here because it's very
593 // similar to what the adapters have to do.
595 class AdapterHandlerEntry : public BasicHashtableEntry<mtCode> {
596 friend class AdapterHandlerTable;
598 private:
599 AdapterFingerPrint* _fingerprint;
600 address _i2c_entry;
601 address _c2i_entry;
602 address _c2i_unverified_entry;
604 #ifdef ASSERT
605 // Captures code and signature used to generate this adapter when
606 // verifing adapter equivalence.
607 unsigned char* _saved_code;
608 int _code_length;
609 BasicType* _saved_sig;
610 int _total_args_passed;
611 #endif
613 void init(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry) {
614 _fingerprint = fingerprint;
615 _i2c_entry = i2c_entry;
616 _c2i_entry = c2i_entry;
617 _c2i_unverified_entry = c2i_unverified_entry;
618 #ifdef ASSERT
619 _saved_code = NULL;
620 _code_length = 0;
621 _saved_sig = NULL;
622 _total_args_passed = 0;
623 #endif
624 }
626 void deallocate();
628 // should never be used
629 AdapterHandlerEntry();
631 public:
632 address get_i2c_entry() const { return _i2c_entry; }
633 address get_c2i_entry() const { return _c2i_entry; }
634 address get_c2i_unverified_entry() const { return _c2i_unverified_entry; }
636 address base_address();
637 void relocate(address new_base);
639 AdapterFingerPrint* fingerprint() const { return _fingerprint; }
641 AdapterHandlerEntry* next() {
642 return (AdapterHandlerEntry*)BasicHashtableEntry<mtCode>::next();
643 }
645 #ifdef ASSERT
646 // Used to verify that code generated for shared adapters is equivalent
647 void save_code(unsigned char* code, int length, int total_args_passed, BasicType* sig_bt);
648 bool compare_code(unsigned char* code, int length, int total_args_passed, BasicType* sig_bt);
649 #endif
651 //virtual void print_on(outputStream* st) const; DO NOT USE
652 void print_adapter_on(outputStream* st) const;
653 };
655 class AdapterHandlerLibrary: public AllStatic {
656 private:
657 static BufferBlob* _buffer; // the temporary code buffer in CodeCache
658 static AdapterHandlerTable* _adapters;
659 static AdapterHandlerEntry* _abstract_method_handler;
660 static BufferBlob* buffer_blob();
661 static void initialize();
663 public:
665 static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint,
666 address i2c_entry, address c2i_entry, address c2i_unverified_entry);
667 static nmethod* create_native_wrapper(methodHandle method, int compile_id);
668 static AdapterHandlerEntry* get_adapter(methodHandle method);
670 #ifdef HAVE_DTRACE_H
671 static nmethod* create_dtrace_nmethod (methodHandle method);
672 #endif // HAVE_DTRACE_H
674 static void print_handler(CodeBlob* b) { print_handler_on(tty, b); }
675 static void print_handler_on(outputStream* st, CodeBlob* b);
676 static bool contains(CodeBlob* b);
677 #ifndef PRODUCT
678 static void print_statistics();
679 #endif /* PRODUCT */
681 };
683 #endif // SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP