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 */
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 code_begin(), code_end(), code_size());
76
77 if (PrintInterpreter) {
78 st->cr();
79 Disassembler::decode(code_begin(), code_end(), st, DEBUG_ONLY(_comments) NOT_DEBUG(CodeComments()));
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 // Native method?
199 // Note: This test must come _before_ the test for intrinsic
200 // methods. See also comments below.
201 if (m->is_native()) {
202 assert(!m->is_method_handle_intrinsic(), "overlapping bits here, watch out");
203 return m->is_synchronized() ? native_synchronized : native;
204 }
205
206 // Synchronized?
207 if (m->is_synchronized()) {
208 return zerolocals_synchronized;
209 }
210
211 if (RegisterFinalizersAtInit && m->code_size() == 1 &&
212 m->intrinsic_id() == vmIntrinsics::_Object_init) {
213 // We need to execute the special return bytecode to check for
214 // finalizer registration so create a normal frame.
215 return zerolocals;
216 }
217
218 // Empty method?
219 if (m->is_empty_method()) {
220 return empty;
221 }
222
223 // Special intrinsic method?
224 // Note: This test must come _after_ the test for native methods,
225 // otherwise we will run into problems with JDK 1.2, see also
226 // AbstractInterpreterGenerator::generate_method_entry() for
227 // for details.
228 switch (m->intrinsic_id()) {
229 case vmIntrinsics::_dsin : return java_lang_math_sin ;
230 case vmIntrinsics::_dcos : return java_lang_math_cos ;
231 case vmIntrinsics::_dtan : return java_lang_math_tan ;
232 case vmIntrinsics::_dabs : return java_lang_math_abs ;
233 case vmIntrinsics::_dsqrt : return java_lang_math_sqrt ;
234 case vmIntrinsics::_dlog : return java_lang_math_log ;
235 case vmIntrinsics::_dlog10: return java_lang_math_log10;
236 case vmIntrinsics::_dpow : return java_lang_math_pow ;
237 case vmIntrinsics::_dexp : return java_lang_math_exp ;
238
239 case vmIntrinsics::_Reference_get:
240 return java_lang_ref_reference_get;
241 }
242
243 // Accessor method?
244 if (m->is_accessor()) {
245 assert(m->size_of_parameters() == 1, "fast code for accessors assumes parameter size = 1");
246 return accessor;
247 }
248
249 // Note: for now: zero locals for all non-empty methods
250 return zerolocals;
251 }
252
253
254 void AbstractInterpreter::set_entry_for_kind(AbstractInterpreter::MethodKind kind, address entry) {
255 assert(kind >= method_handle_invoke_FIRST &&
256 kind <= method_handle_invoke_LAST, "late initialization only for MH entry points");
257 assert(_entry_table[kind] == _entry_table[abstract], "previous value must be AME entry");
258 _entry_table[kind] = entry;
259 }
260
261
262 // Return true if the interpreter can prove that the given bytecode has
263 // not yet been executed (in Java semantics, not in actual operation).
264 bool AbstractInterpreter::is_not_reached(methodHandle method, int bci) {
265 Bytecodes::Code code = method()->code_at(bci);
266
267 if (!Bytecodes::must_rewrite(code)) {
268 // might have been reached
269 return false;
270 }
271
272 // the bytecode might not be rewritten if the method is an accessor, etc.
273 address ientry = method->interpreter_entry();
274 if (ientry != entry_for_kind(AbstractInterpreter::zerolocals) &&
275 ientry != entry_for_kind(AbstractInterpreter::zerolocals_synchronized))
276 return false; // interpreter does not run this method!
277
278 // otherwise, we can be sure this bytecode has never been executed
279 return true;
280 }
281
282
283 #ifndef PRODUCT
284 void AbstractInterpreter::print_method_kind(MethodKind kind) {
285 switch (kind) {
286 case zerolocals : tty->print("zerolocals" ); break;
287 case zerolocals_synchronized: tty->print("zerolocals_synchronized"); break;
288 case native : tty->print("native" ); break;
289 case native_synchronized : tty->print("native_synchronized" ); break;
290 case empty : tty->print("empty" ); break;
291 case accessor : tty->print("accessor" ); break;
292 case abstract : tty->print("abstract" ); break;
293 case java_lang_math_sin : tty->print("java_lang_math_sin" ); break;
294 case java_lang_math_cos : tty->print("java_lang_math_cos" ); break;
295 case java_lang_math_tan : tty->print("java_lang_math_tan" ); break;
296 case java_lang_math_abs : tty->print("java_lang_math_abs" ); break;
297 case java_lang_math_sqrt : tty->print("java_lang_math_sqrt" ); break;
298 case java_lang_math_log : tty->print("java_lang_math_log" ); break;
299 case java_lang_math_log10 : tty->print("java_lang_math_log10" ); break;
300 default:
301 if (kind >= method_handle_invoke_FIRST &&
302 kind <= method_handle_invoke_LAST) {
303 const char* kind_name = vmIntrinsics::name_at(method_handle_intrinsic(kind));
304 if (kind_name[0] == '_') kind_name = &kind_name[1]; // '_invokeExact' => 'invokeExact'
305 tty->print("method_handle_%s", kind_name);
306 break;
307 }
308 ShouldNotReachHere();
309 break;
310 }
311 }
312 #endif // PRODUCT
313
314
315 //------------------------------------------------------------------------------------------------------------------------
316 // Deoptimization support
317
318 // If deoptimization happens, this function returns the point of next bytecode to continue execution
319 address AbstractInterpreter::deopt_continue_after_entry(Method* method, address bcp, int callee_parameters, bool is_top_frame) {
320 assert(method->contains(bcp), "just checkin'");
321 Bytecodes::Code code = Bytecodes::java_code_at(method, bcp);
322 assert(!Interpreter::bytecode_should_reexecute(code), "should not reexecute");
323 int bci = method->bci_from(bcp);
324 int length = -1; // initial value for debugging
325 // compute continuation length
326 length = Bytecodes::length_at(method, bcp);
327 // compute result type
328 BasicType type = T_ILLEGAL;
329
330 switch (code) {
331 case Bytecodes::_invokevirtual :
332 case Bytecodes::_invokespecial :
333 case Bytecodes::_invokestatic :
334 case Bytecodes::_invokeinterface: {
335 Thread *thread = Thread::current();
336 ResourceMark rm(thread);
337 methodHandle mh(thread, method);
338 type = Bytecode_invoke(mh, bci).result_type();
339 // since the cache entry might not be initialized:
340 // (NOT needed for the old calling convension)
341 if (!is_top_frame) {
342 int index = Bytes::get_native_u2(bcp+1);
343 method->constants()->cache()->entry_at(index)->set_parameter_size(callee_parameters);
344 }
345 break;
346 }
347
348 case Bytecodes::_invokedynamic: {
349 Thread *thread = Thread::current();
350 ResourceMark rm(thread);
351 methodHandle mh(thread, method);
352 type = Bytecode_invoke(mh, bci).result_type();
353 // since the cache entry might not be initialized:
354 // (NOT needed for the old calling convension)
355 if (!is_top_frame) {
356 int index = Bytes::get_native_u4(bcp+1);
357 method->constants()->invokedynamic_cp_cache_entry_at(index)->set_parameter_size(callee_parameters);
358 }
359 break;
360 }
361
362 case Bytecodes::_ldc :
363 case Bytecodes::_ldc_w : // fall through
364 case Bytecodes::_ldc2_w:
365 {
366 Thread *thread = Thread::current();
367 ResourceMark rm(thread);
368 methodHandle mh(thread, method);
369 type = Bytecode_loadconstant(mh, bci).result_type();
370 break;
371 }
372
373 default:
374 type = Bytecodes::result_type(code);
375 break;
376 }
377
378 // return entry point for computed continuation state & bytecode length
379 return
380 is_top_frame
381 ? Interpreter::deopt_entry (as_TosState(type), length)
382 : Interpreter::return_entry(as_TosState(type), length);
383 }
384
385 // If deoptimization happens, this function returns the point where the interpreter reexecutes
386 // the bytecode.
387 // Note: Bytecodes::_athrow is a special case in that it does not return
388 // Interpreter::deopt_entry(vtos, 0) like others
389 address AbstractInterpreter::deopt_reexecute_entry(Method* method, address bcp) {
390 assert(method->contains(bcp), "just checkin'");
391 Bytecodes::Code code = Bytecodes::java_code_at(method, bcp);
392 #ifdef COMPILER1
393 if(code == Bytecodes::_athrow ) {
394 return Interpreter::rethrow_exception_entry();
395 }
396 #endif /* COMPILER1 */
397 return Interpreter::deopt_entry(vtos, 0);
398 }
399
400 // If deoptimization happens, the interpreter should reexecute these bytecodes.
401 // This function mainly helps the compilers to set up the reexecute bit.
402 bool AbstractInterpreter::bytecode_should_reexecute(Bytecodes::Code code) {
403 switch (code) {
404 case Bytecodes::_lookupswitch:
405 case Bytecodes::_tableswitch:
406 case Bytecodes::_fast_binaryswitch:
407 case Bytecodes::_fast_linearswitch:
408 // recompute condtional expression folded into _if<cond>
409 case Bytecodes::_lcmp :
410 case Bytecodes::_fcmpl :
411 case Bytecodes::_fcmpg :
412 case Bytecodes::_dcmpl :
413 case Bytecodes::_dcmpg :
414 case Bytecodes::_ifnull :
415 case Bytecodes::_ifnonnull :
416 case Bytecodes::_goto :
417 case Bytecodes::_goto_w :
418 case Bytecodes::_ifeq :
419 case Bytecodes::_ifne :
420 case Bytecodes::_iflt :
421 case Bytecodes::_ifge :
422 case Bytecodes::_ifgt :
423 case Bytecodes::_ifle :
424 case Bytecodes::_if_icmpeq :
425 case Bytecodes::_if_icmpne :
426 case Bytecodes::_if_icmplt :
427 case Bytecodes::_if_icmpge :
428 case Bytecodes::_if_icmpgt :
429 case Bytecodes::_if_icmple :
430 case Bytecodes::_if_acmpeq :
431 case Bytecodes::_if_acmpne :
432 // special cases
433 case Bytecodes::_getfield :
434 case Bytecodes::_putfield :
435 case Bytecodes::_getstatic :
436 case Bytecodes::_putstatic :
437 case Bytecodes::_aastore :
438 #ifdef COMPILER1
439 //special case of reexecution
440 case Bytecodes::_athrow :
441 #endif
442 return true;
443
444 default:
445 return false;
446 }
447 }
448
449 void AbstractInterpreterGenerator::bang_stack_shadow_pages(bool native_call) {
450 // Quick & dirty stack overflow checking: bang the stack & handle trap.
451 // Note that we do the banging after the frame is setup, since the exception
452 // handling code expects to find a valid interpreter frame on the stack.
453 // Doing the banging earlier fails if the caller frame is not an interpreter
454 // frame.
455 // (Also, the exception throwing code expects to unlock any synchronized
456 // method receiever, so do the banging after locking the receiver.)
457
458 // Bang each page in the shadow zone. We can't assume it's been done for
459 // an interpreter frame with greater than a page of locals, so each page
460 // needs to be checked. Only true for non-native.
461 if (UseStackBanging) {
462 const int start_page = native_call ? StackShadowPages : 1;
463 const int page_size = os::vm_page_size();
464 for (int pages = start_page; pages <= StackShadowPages ; pages++) {
465 __ bang_stack_with_offset(pages*page_size);
466 }
467 }
468 }
469
470 void AbstractInterpreterGenerator::initialize_method_handle_entries() {
471 // method handle entry kinds are generated later in MethodHandlesAdapterGenerator::generate:
472 for (int i = Interpreter::method_handle_invoke_FIRST; i <= Interpreter::method_handle_invoke_LAST; i++) {
473 Interpreter::MethodKind kind = (Interpreter::MethodKind) i;
474 Interpreter::_entry_table[kind] = Interpreter::_entry_table[Interpreter::abstract];
475 }
476 }