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comparison: src/share/vm/interpreter/interpreter.cpp

src/share/vm/interpreter/interpreter.cpp

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1 /*
2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "asm/macroAssembler.hpp"
27 #include "asm/macroAssembler.inline.hpp"
28 #include "compiler/disassembler.hpp"
29 #include "interpreter/bytecodeHistogram.hpp"
30 #include "interpreter/bytecodeInterpreter.hpp"
31 #include "interpreter/interpreter.hpp"
32 #include "interpreter/interpreterRuntime.hpp"
33 #include "interpreter/templateTable.hpp"
34 #include "memory/allocation.inline.hpp"
35 #include "memory/resourceArea.hpp"
36 #include "oops/arrayOop.hpp"
37 #include "oops/methodData.hpp"
38 #include "oops/method.hpp"
39 #include "oops/oop.inline.hpp"
40 #include "prims/forte.hpp"
41 #include "prims/jvmtiExport.hpp"
42 #include "prims/methodHandles.hpp"
43 #include "runtime/handles.inline.hpp"
44 #include "runtime/sharedRuntime.hpp"
45 #include "runtime/stubRoutines.hpp"
46 #include "runtime/timer.hpp"
47
48 # define __ _masm->
49
50
51 //------------------------------------------------------------------------------------------------------------------------
52 // Implementation of InterpreterCodelet
53
54 void InterpreterCodelet::initialize(const char* description, Bytecodes::Code bytecode) {
55 _description = description;
56 _bytecode = bytecode;
57 }
58
59
60 void InterpreterCodelet::verify() {
61 }
62
63
64 void InterpreterCodelet::print_on(outputStream* st) const {
65 ttyLocker ttyl;
66
67 if (PrintInterpreter) {
68 st->cr();
69 st->print_cr("----------------------------------------------------------------------");
70 }
71
72 if (description() != NULL) st->print("%s ", description());
73 if (bytecode() >= 0 ) st->print("%d %s ", bytecode(), Bytecodes::name(bytecode()));
74 st->print_cr("[" INTPTR_FORMAT ", " INTPTR_FORMAT "] %d bytes",
75 p2i(code_begin()), p2i(code_end()), code_size());
76
77 if (PrintInterpreter) {
78 st->cr();
79 Disassembler::decode(code_begin(), code_end(), st, DEBUG_ONLY(_strings) NOT_DEBUG(CodeStrings()));
80 }
81 }
82
83
84 //------------------------------------------------------------------------------------------------------------------------
85 // Implementation of platform independent aspects of Interpreter
86
87 void AbstractInterpreter::initialize() {
88 if (_code != NULL) return;
89
90 // make sure 'imported' classes are initialized
91 if (CountBytecodes || TraceBytecodes || StopInterpreterAt) BytecodeCounter::reset();
92 if (PrintBytecodeHistogram) BytecodeHistogram::reset();
93 if (PrintBytecodePairHistogram) BytecodePairHistogram::reset();
94
95 InvocationCounter::reinitialize(DelayCompilationDuringStartup);
96
97 }
98
99 void AbstractInterpreter::print() {
100 tty->cr();
101 tty->print_cr("----------------------------------------------------------------------");
102 tty->print_cr("Interpreter");
103 tty->cr();
104 tty->print_cr("code size = %6dK bytes", (int)_code->used_space()/1024);
105 tty->print_cr("total space = %6dK bytes", (int)_code->total_space()/1024);
106 tty->print_cr("wasted space = %6dK bytes", (int)_code->available_space()/1024);
107 tty->cr();
108 tty->print_cr("# of codelets = %6d" , _code->number_of_stubs());
109 tty->print_cr("avg codelet size = %6d bytes", _code->used_space() / _code->number_of_stubs());
110 tty->cr();
111 _code->print();
112 tty->print_cr("----------------------------------------------------------------------");
113 tty->cr();
114 }
115
116
117 void interpreter_init() {
118 Interpreter::initialize();
119 #ifndef PRODUCT
120 if (TraceBytecodes) BytecodeTracer::set_closure(BytecodeTracer::std_closure());
121 #endif // PRODUCT
122 // need to hit every safepoint in order to call zapping routine
123 // register the interpreter
124 Forte::register_stub(
125 "Interpreter",
126 AbstractInterpreter::code()->code_start(),
127 AbstractInterpreter::code()->code_end()
128 );
129
130 // notify JVMTI profiler
131 if (JvmtiExport::should_post_dynamic_code_generated()) {
132 JvmtiExport::post_dynamic_code_generated("Interpreter",
133 AbstractInterpreter::code()->code_start(),
134 AbstractInterpreter::code()->code_end());
135 }
136 }
137
138 //------------------------------------------------------------------------------------------------------------------------
139 // Implementation of interpreter
140
141 StubQueue* AbstractInterpreter::_code = NULL;
142 bool AbstractInterpreter::_notice_safepoints = false;
143 address AbstractInterpreter::_rethrow_exception_entry = NULL;
144
145 address AbstractInterpreter::_native_entry_begin = NULL;
146 address AbstractInterpreter::_native_entry_end = NULL;
147 address AbstractInterpreter::_slow_signature_handler;
148 address AbstractInterpreter::_entry_table [AbstractInterpreter::number_of_method_entries];
149 address AbstractInterpreter::_native_abi_to_tosca [AbstractInterpreter::number_of_result_handlers];
150
151 //------------------------------------------------------------------------------------------------------------------------
152 // Generation of complete interpreter
153
154 AbstractInterpreterGenerator::AbstractInterpreterGenerator(StubQueue* _code) {
155 _masm = NULL;
156 }
157
158
159 static const BasicType types[Interpreter::number_of_result_handlers] = {
160 T_BOOLEAN,
161 T_CHAR ,
162 T_BYTE ,
163 T_SHORT ,
164 T_INT ,
165 T_LONG ,
166 T_VOID ,
167 T_FLOAT ,
168 T_DOUBLE ,
169 T_OBJECT
170 };
171
172 void AbstractInterpreterGenerator::generate_all() {
173
174
175 { CodeletMark cm(_masm, "slow signature handler");
176 Interpreter::_slow_signature_handler = generate_slow_signature_handler();
177 }
178
179 }
180
181 //------------------------------------------------------------------------------------------------------------------------
182 // Entry points
183
184 AbstractInterpreter::MethodKind AbstractInterpreter::method_kind(methodHandle m) {
185 // Abstract method?
186 if (m->is_abstract()) return abstract;
187
188 // Method handle primitive?
189 if (m->is_method_handle_intrinsic()) {
190 vmIntrinsics::ID id = m->intrinsic_id();
191 assert(MethodHandles::is_signature_polymorphic(id), "must match an intrinsic");
192 MethodKind kind = (MethodKind)( method_handle_invoke_FIRST +
193 ((int)id - vmIntrinsics::FIRST_MH_SIG_POLY) );
194 assert(kind <= method_handle_invoke_LAST, "parallel enum ranges");
195 return kind;
196 }
197
198 #ifndef CC_INTERP
199 if (UseCRC32Intrinsics && m->is_native()) {
200 // Use optimized stub code for CRC32 native methods.
201 switch (m->intrinsic_id()) {
202 case vmIntrinsics::_updateCRC32 : return java_util_zip_CRC32_update;
203 case vmIntrinsics::_updateBytesCRC32 : return java_util_zip_CRC32_updateBytes;
204 case vmIntrinsics::_updateByteBufferCRC32 : return java_util_zip_CRC32_updateByteBuffer;
205 }
206 }
207 #endif
208
209 // Native method?
210 // Note: This test must come _before_ the test for intrinsic
211 // methods. See also comments below.
212 if (m->is_native()) {
213 assert(!m->is_method_handle_intrinsic(), "overlapping bits here, watch out");
214 return m->is_synchronized() ? native_synchronized : native;
215 }
216
217 // Synchronized?
218 if (m->is_synchronized()) {
219 return zerolocals_synchronized;
220 }
221
222 if (RegisterFinalizersAtInit && m->code_size() == 1 &&
223 m->intrinsic_id() == vmIntrinsics::_Object_init) {
224 // We need to execute the special return bytecode to check for
225 // finalizer registration so create a normal frame.
226 return zerolocals;
227 }
228
229 // Empty method?
230 if (m->is_empty_method()) {
231 return empty;
232 }
233
234 // Special intrinsic method?
235 // Note: This test must come _after_ the test for native methods,
236 // otherwise we will run into problems with JDK 1.2, see also
237 // AbstractInterpreterGenerator::generate_method_entry() for
238 // for details.
239 switch (m->intrinsic_id()) {
240 case vmIntrinsics::_dsin : return java_lang_math_sin ;
241 case vmIntrinsics::_dcos : return java_lang_math_cos ;
242 case vmIntrinsics::_dtan : return java_lang_math_tan ;
243 case vmIntrinsics::_dabs : return java_lang_math_abs ;
244 case vmIntrinsics::_dsqrt : return java_lang_math_sqrt ;
245 case vmIntrinsics::_dlog : return java_lang_math_log ;
246 case vmIntrinsics::_dlog10: return java_lang_math_log10;
247 case vmIntrinsics::_dpow : return java_lang_math_pow ;
248 case vmIntrinsics::_dexp : return java_lang_math_exp ;
249
250 case vmIntrinsics::_Reference_get:
251 return java_lang_ref_reference_get;
252 }
253
254 // Accessor method?
255 if (m->is_accessor()) {
256 assert(m->size_of_parameters() == 1, "fast code for accessors assumes parameter size = 1");
257 return accessor;
258 }
259
260 // Note: for now: zero locals for all non-empty methods
261 return zerolocals;
262 }
263
264
265 void AbstractInterpreter::set_entry_for_kind(AbstractInterpreter::MethodKind kind, address entry) {
266 assert(kind >= method_handle_invoke_FIRST &&
267 kind <= method_handle_invoke_LAST, "late initialization only for MH entry points");
268 assert(_entry_table[kind] == _entry_table[abstract], "previous value must be AME entry");
269 _entry_table[kind] = entry;
270 }
271
272
273 // Return true if the interpreter can prove that the given bytecode has
274 // not yet been executed (in Java semantics, not in actual operation).
275 bool AbstractInterpreter::is_not_reached(methodHandle method, int bci) {
276 Bytecodes::Code code = method()->code_at(bci);
277
278 if (!Bytecodes::must_rewrite(code)) {
279 // might have been reached
280 return false;
281 }
282
283 // the bytecode might not be rewritten if the method is an accessor, etc.
284 address ientry = method->interpreter_entry();
285 if (ientry != entry_for_kind(AbstractInterpreter::zerolocals) &&
286 ientry != entry_for_kind(AbstractInterpreter::zerolocals_synchronized))
287 return false; // interpreter does not run this method!
288
289 // otherwise, we can be sure this bytecode has never been executed
290 return true;
291 }
292
293
294 #ifndef PRODUCT
295 void AbstractInterpreter::print_method_kind(MethodKind kind) {
296 switch (kind) {
297 case zerolocals : tty->print("zerolocals" ); break;
298 case zerolocals_synchronized: tty->print("zerolocals_synchronized"); break;
299 case native : tty->print("native" ); break;
300 case native_synchronized : tty->print("native_synchronized" ); break;
301 case empty : tty->print("empty" ); break;
302 case accessor : tty->print("accessor" ); break;
303 case abstract : tty->print("abstract" ); break;
304 case java_lang_math_sin : tty->print("java_lang_math_sin" ); break;
305 case java_lang_math_cos : tty->print("java_lang_math_cos" ); break;
306 case java_lang_math_tan : tty->print("java_lang_math_tan" ); break;
307 case java_lang_math_abs : tty->print("java_lang_math_abs" ); break;
308 case java_lang_math_sqrt : tty->print("java_lang_math_sqrt" ); break;
309 case java_lang_math_log : tty->print("java_lang_math_log" ); break;
310 case java_lang_math_log10 : tty->print("java_lang_math_log10" ); break;
311 case java_util_zip_CRC32_update : tty->print("java_util_zip_CRC32_update"); break;
312 case java_util_zip_CRC32_updateBytes : tty->print("java_util_zip_CRC32_updateBytes"); break;
313 case java_util_zip_CRC32_updateByteBuffer : tty->print("java_util_zip_CRC32_updateByteBuffer"); break;
314 default:
315 if (kind >= method_handle_invoke_FIRST &&
316 kind <= method_handle_invoke_LAST) {
317 const char* kind_name = vmIntrinsics::name_at(method_handle_intrinsic(kind));
318 if (kind_name[0] == '_') kind_name = &kind_name[1]; // '_invokeExact' => 'invokeExact'
319 tty->print("method_handle_%s", kind_name);
320 break;
321 }
322 ShouldNotReachHere();
323 break;
324 }
325 }
326 #endif // PRODUCT
327
328
329 //------------------------------------------------------------------------------------------------------------------------
330 // Deoptimization support
331
332 /**
333 * If a deoptimization happens, this function returns the point of next bytecode to continue execution.
334 */
335 address AbstractInterpreter::deopt_continue_after_entry(Method* method, address bcp, int callee_parameters, bool is_top_frame) {
336 assert(method->contains(bcp), "just checkin'");
337
338 // Get the original and rewritten bytecode.
339 Bytecodes::Code code = Bytecodes::java_code_at(method, bcp);
340 assert(!Interpreter::bytecode_should_reexecute(code), "should not reexecute");
341
342 const int bci = method->bci_from(bcp);
343
344 // compute continuation length
345 const int length = Bytecodes::length_at(method, bcp);
346
347 // compute result type
348 BasicType type = T_ILLEGAL;
349
350 switch (code) {
351 case Bytecodes::_invokevirtual :
352 case Bytecodes::_invokespecial :
353 case Bytecodes::_invokestatic :
354 case Bytecodes::_invokeinterface: {
355 Thread *thread = Thread::current();
356 ResourceMark rm(thread);
357 methodHandle mh(thread, method);
358 type = Bytecode_invoke(mh, bci).result_type();
359 // since the cache entry might not be initialized:
360 // (NOT needed for the old calling convension)
361 if (!is_top_frame) {
362 int index = Bytes::get_native_u2(bcp+1);
363 method->constants()->cache()->entry_at(index)->set_parameter_size(callee_parameters);
364 }
365 break;
366 }
367
368 case Bytecodes::_invokedynamic: {
369 Thread *thread = Thread::current();
370 ResourceMark rm(thread);
371 methodHandle mh(thread, method);
372 type = Bytecode_invoke(mh, bci).result_type();
373 // since the cache entry might not be initialized:
374 // (NOT needed for the old calling convension)
375 if (!is_top_frame) {
376 int index = Bytes::get_native_u4(bcp+1);
377 method->constants()->invokedynamic_cp_cache_entry_at(index)->set_parameter_size(callee_parameters);
378 }
379 break;
380 }
381
382 case Bytecodes::_ldc :
383 case Bytecodes::_ldc_w : // fall through
384 case Bytecodes::_ldc2_w:
385 {
386 Thread *thread = Thread::current();
387 ResourceMark rm(thread);
388 methodHandle mh(thread, method);
389 type = Bytecode_loadconstant(mh, bci).result_type();
390 break;
391 }
392
393 default:
394 type = Bytecodes::result_type(code);
395 break;
396 }
397
398 // return entry point for computed continuation state & bytecode length
399 return
400 is_top_frame
401 ? Interpreter::deopt_entry (as_TosState(type), length)
402 : Interpreter::return_entry(as_TosState(type), length, code);
403 }
404
405 // If deoptimization happens, this function returns the point where the interpreter reexecutes
406 // the bytecode.
407 // Note: Bytecodes::_athrow is a special case in that it does not return
408 // Interpreter::deopt_entry(vtos, 0) like others
409 address AbstractInterpreter::deopt_reexecute_entry(Method* method, address bcp) {
410 assert(method->contains(bcp), "just checkin'");
411 Bytecodes::Code code = Bytecodes::java_code_at(method, bcp);
412 #ifdef COMPILER1
413 if(code == Bytecodes::_athrow ) {
414 return Interpreter::rethrow_exception_entry();
415 }
416 #endif /* COMPILER1 */
417 return Interpreter::deopt_entry(vtos, 0);
418 }
419
420 // If deoptimization happens, the interpreter should reexecute these bytecodes.
421 // This function mainly helps the compilers to set up the reexecute bit.
422 bool AbstractInterpreter::bytecode_should_reexecute(Bytecodes::Code code) {
423 switch (code) {
424 case Bytecodes::_lookupswitch:
425 case Bytecodes::_tableswitch:
426 case Bytecodes::_fast_binaryswitch:
427 case Bytecodes::_fast_linearswitch:
428 // recompute condtional expression folded into _if<cond>
429 case Bytecodes::_lcmp :
430 case Bytecodes::_fcmpl :
431 case Bytecodes::_fcmpg :
432 case Bytecodes::_dcmpl :
433 case Bytecodes::_dcmpg :
434 case Bytecodes::_ifnull :
435 case Bytecodes::_ifnonnull :
436 case Bytecodes::_goto :
437 case Bytecodes::_goto_w :
438 case Bytecodes::_ifeq :
439 case Bytecodes::_ifne :
440 case Bytecodes::_iflt :
441 case Bytecodes::_ifge :
442 case Bytecodes::_ifgt :
443 case Bytecodes::_ifle :
444 case Bytecodes::_if_icmpeq :
445 case Bytecodes::_if_icmpne :
446 case Bytecodes::_if_icmplt :
447 case Bytecodes::_if_icmpge :
448 case Bytecodes::_if_icmpgt :
449 case Bytecodes::_if_icmple :
450 case Bytecodes::_if_acmpeq :
451 case Bytecodes::_if_acmpne :
452 // special cases
453 case Bytecodes::_getfield :
454 case Bytecodes::_putfield :
455 case Bytecodes::_getstatic :
456 case Bytecodes::_putstatic :
457 case Bytecodes::_aastore :
458 #ifdef COMPILER1
459 //special case of reexecution
460 case Bytecodes::_athrow :
461 #endif
462 return true;
463
464 default:
465 return false;
466 }
467 }
468
469 void AbstractInterpreterGenerator::bang_stack_shadow_pages(bool native_call) {
470 // Quick & dirty stack overflow checking: bang the stack & handle trap.
471 // Note that we do the banging after the frame is setup, since the exception
472 // handling code expects to find a valid interpreter frame on the stack.
473 // Doing the banging earlier fails if the caller frame is not an interpreter
474 // frame.
475 // (Also, the exception throwing code expects to unlock any synchronized
476 // method receiever, so do the banging after locking the receiver.)
477
478 // Bang each page in the shadow zone. We can't assume it's been done for
479 // an interpreter frame with greater than a page of locals, so each page
480 // needs to be checked. Only true for non-native.
481 if (UseStackBanging) {
482 const int start_page = native_call ? StackShadowPages : 1;
483 const int page_size = os::vm_page_size();
484 for (int pages = start_page; pages <= StackShadowPages ; pages++) {
485 __ bang_stack_with_offset(pages*page_size);
486 }
487 }
488 }
489
490 void AbstractInterpreterGenerator::initialize_method_handle_entries() {
491 // method handle entry kinds are generated later in MethodHandlesAdapterGenerator::generate:
492 for (int i = Interpreter::method_handle_invoke_FIRST; i <= Interpreter::method_handle_invoke_LAST; i++) {
493 Interpreter::MethodKind kind = (Interpreter::MethodKind) i;
494 Interpreter::_entry_table[kind] = Interpreter::_entry_table[Interpreter::abstract];
495 }
496 }

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