1 /*
2 * Copyright (c) 1997, 2010, 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/assembler.hpp"
27 #include "interpreter/bytecodeHistogram.hpp"
28 #include "interpreter/bytecodeInterpreter.hpp"
29 #include "interpreter/interpreter.hpp"
30 #include "interpreter/interpreterRuntime.hpp"
31 #include "interpreter/templateTable.hpp"
32 #include "memory/allocation.inline.hpp"
33 #include "memory/resourceArea.hpp"
34 #include "oops/arrayOop.hpp"
35 #include "oops/methodDataOop.hpp"
36 #include "oops/methodOop.hpp"
37 #include "oops/oop.inline.hpp"
38 #include "prims/forte.hpp"
39 #include "prims/jvmtiExport.hpp"
40 #include "runtime/handles.inline.hpp"
41 #include "runtime/sharedRuntime.hpp"
42 #include "runtime/stubRoutines.hpp"
43 #include "runtime/timer.hpp"
44
45 # define __ _masm->
46
47
48 //------------------------------------------------------------------------------------------------------------------------
49 // Implementation of InterpreterCodelet
50
51 void InterpreterCodelet::initialize(const char* description, Bytecodes::Code bytecode) {
52 _description = description;
53 _bytecode = bytecode;
54 }
55
56
57 void InterpreterCodelet::verify() {
58 }
59
60
61 void InterpreterCodelet::print_on(outputStream* st) const {
62 if (PrintInterpreter) {
63 st->cr();
64 st->print_cr("----------------------------------------------------------------------");
65 }
66
67 if (description() != NULL) st->print("%s ", description());
68 if (bytecode() >= 0 ) st->print("%d %s ", bytecode(), Bytecodes::name(bytecode()));
69 st->print_cr("[" INTPTR_FORMAT ", " INTPTR_FORMAT "] %d bytes",
70 code_begin(), code_end(), code_size());
71
72 if (PrintInterpreter) {
73 st->cr();
74 Disassembler::decode(code_begin(), code_end(), st);
75 }
76 }
77
78
79 //------------------------------------------------------------------------------------------------------------------------
80 // Implementation of platform independent aspects of Interpreter
81
82 void AbstractInterpreter::initialize() {
83 if (_code != NULL) return;
84
85 // make sure 'imported' classes are initialized
86 if (CountBytecodes || TraceBytecodes || StopInterpreterAt) BytecodeCounter::reset();
87 if (PrintBytecodeHistogram) BytecodeHistogram::reset();
88 if (PrintBytecodePairHistogram) BytecodePairHistogram::reset();
89
90 InvocationCounter::reinitialize(DelayCompilationDuringStartup);
91
92 }
93
94 void AbstractInterpreter::print() {
95 tty->cr();
96 tty->print_cr("----------------------------------------------------------------------");
97 tty->print_cr("Interpreter");
98 tty->cr();
99 tty->print_cr("code size = %6dK bytes", (int)_code->used_space()/1024);
100 tty->print_cr("total space = %6dK bytes", (int)_code->total_space()/1024);
101 tty->print_cr("wasted space = %6dK bytes", (int)_code->available_space()/1024);
102 tty->cr();
103 tty->print_cr("# of codelets = %6d" , _code->number_of_stubs());
104 tty->print_cr("avg codelet size = %6d bytes", _code->used_space() / _code->number_of_stubs());
105 tty->cr();
106 _code->print();
107 tty->print_cr("----------------------------------------------------------------------");
108 tty->cr();
109 }
110
111
112 void interpreter_init() {
113 Interpreter::initialize();
114 #ifndef PRODUCT
115 if (TraceBytecodes) BytecodeTracer::set_closure(BytecodeTracer::std_closure());
116 #endif // PRODUCT
117 // need to hit every safepoint in order to call zapping routine
118 // register the interpreter
119 Forte::register_stub(
120 "Interpreter",
121 AbstractInterpreter::code()->code_start(),
122 AbstractInterpreter::code()->code_end()
123 );
124
125 // notify JVMTI profiler
126 if (JvmtiExport::should_post_dynamic_code_generated()) {
127 JvmtiExport::post_dynamic_code_generated("Interpreter",
128 AbstractInterpreter::code()->code_start(),
129 AbstractInterpreter::code()->code_end());
130 }
131 }
132
133 //------------------------------------------------------------------------------------------------------------------------
134 // Implementation of interpreter
135
136 StubQueue* AbstractInterpreter::_code = NULL;
137 bool AbstractInterpreter::_notice_safepoints = false;
138 address AbstractInterpreter::_rethrow_exception_entry = NULL;
139
140 address AbstractInterpreter::_native_entry_begin = NULL;
141 address AbstractInterpreter::_native_entry_end = NULL;
142 address AbstractInterpreter::_slow_signature_handler;
143 address AbstractInterpreter::_entry_table [AbstractInterpreter::number_of_method_entries];
144 address AbstractInterpreter::_native_abi_to_tosca [AbstractInterpreter::number_of_result_handlers];
145
146 //------------------------------------------------------------------------------------------------------------------------
147 // Generation of complete interpreter
148
149 AbstractInterpreterGenerator::AbstractInterpreterGenerator(StubQueue* _code) {
150 _masm = NULL;
151 }
152
153
154 static const BasicType types[Interpreter::number_of_result_handlers] = {
155 T_BOOLEAN,
156 T_CHAR ,
157 T_BYTE ,
158 T_SHORT ,
159 T_INT ,
160 T_LONG ,
161 T_VOID ,
162 T_FLOAT ,
163 T_DOUBLE ,
164 T_OBJECT
165 };
166
167 void AbstractInterpreterGenerator::generate_all() {
168
169
170 { CodeletMark cm(_masm, "slow signature handler");
171 Interpreter::_slow_signature_handler = generate_slow_signature_handler();
172 }
173
174 }
175
176 //------------------------------------------------------------------------------------------------------------------------
177 // Entry points
178
179 AbstractInterpreter::MethodKind AbstractInterpreter::method_kind(methodHandle m) {
180 // Abstract method?
181 if (m->is_abstract()) return abstract;
182
183 // Invoker for method handles?
184 if (m->is_method_handle_invoke()) return method_handle;
185
186 // Native method?
187 // Note: This test must come _before_ the test for intrinsic
188 // methods. See also comments below.
189 if (m->is_native()) {
190 assert(!m->is_method_handle_invoke(), "overlapping bits here, watch out");
191 return m->is_synchronized() ? native_synchronized : native;
192 }
193
194 // Synchronized?
195 if (m->is_synchronized()) {
196 return zerolocals_synchronized;
197 }
198
199 if (RegisterFinalizersAtInit && m->code_size() == 1 &&
200 m->intrinsic_id() == vmIntrinsics::_Object_init) {
201 // We need to execute the special return bytecode to check for
202 // finalizer registration so create a normal frame.
203 return zerolocals;
204 }
205
206 // Empty method?
207 if (m->is_empty_method()) {
208 return empty;
209 }
210
211 // Accessor method?
212 if (m->is_accessor()) {
213 assert(m->size_of_parameters() == 1, "fast code for accessors assumes parameter size = 1");
214 return accessor;
215 }
216
217 // Special intrinsic method?
218 // Note: This test must come _after_ the test for native methods,
219 // otherwise we will run into problems with JDK 1.2, see also
220 // AbstractInterpreterGenerator::generate_method_entry() for
221 // for details.
222 switch (m->intrinsic_id()) {
223 case vmIntrinsics::_dsin : return java_lang_math_sin ;
224 case vmIntrinsics::_dcos : return java_lang_math_cos ;
225 case vmIntrinsics::_dtan : return java_lang_math_tan ;
226 case vmIntrinsics::_dabs : return java_lang_math_abs ;
227 case vmIntrinsics::_dsqrt : return java_lang_math_sqrt ;
228 case vmIntrinsics::_dlog : return java_lang_math_log ;
229 case vmIntrinsics::_dlog10: return java_lang_math_log10;
230 }
231
232 // Note: for now: zero locals for all non-empty methods
233 return zerolocals;
234 }
235
236
237 // Return true if the interpreter can prove that the given bytecode has
238 // not yet been executed (in Java semantics, not in actual operation).
239 bool AbstractInterpreter::is_not_reached(methodHandle method, int bci) {
240 address bcp = method->bcp_from(bci);
241 Bytecodes::Code code = Bytecodes::code_at(bcp, method());
242
243 if (!Bytecode_at(bcp)->must_rewrite(code)) {
244 // might have been reached
245 return false;
246 }
247
248 // the bytecode might not be rewritten if the method is an accessor, etc.
249 address ientry = method->interpreter_entry();
250 if (ientry != entry_for_kind(AbstractInterpreter::zerolocals) &&
251 ientry != entry_for_kind(AbstractInterpreter::zerolocals_synchronized))
252 return false; // interpreter does not run this method!
253
254 // otherwise, we can be sure this bytecode has never been executed
255 return true;
256 }
257
258
259 #ifndef PRODUCT
260 void AbstractInterpreter::print_method_kind(MethodKind kind) {
261 switch (kind) {
262 case zerolocals : tty->print("zerolocals" ); break;
263 case zerolocals_synchronized: tty->print("zerolocals_synchronized"); break;
264 case native : tty->print("native" ); break;
265 case native_synchronized : tty->print("native_synchronized" ); break;
266 case empty : tty->print("empty" ); break;
267 case accessor : tty->print("accessor" ); break;
268 case abstract : tty->print("abstract" ); break;
269 case method_handle : tty->print("method_handle" ); break;
270 case java_lang_math_sin : tty->print("java_lang_math_sin" ); break;
271 case java_lang_math_cos : tty->print("java_lang_math_cos" ); break;
272 case java_lang_math_tan : tty->print("java_lang_math_tan" ); break;
273 case java_lang_math_abs : tty->print("java_lang_math_abs" ); break;
274 case java_lang_math_sqrt : tty->print("java_lang_math_sqrt" ); break;
275 case java_lang_math_log : tty->print("java_lang_math_log" ); break;
276 case java_lang_math_log10 : tty->print("java_lang_math_log10" ); break;
277 default : ShouldNotReachHere();
278 }
279 }
280 #endif // PRODUCT
281
282
283 //------------------------------------------------------------------------------------------------------------------------
284 // Deoptimization support
285
286 // If deoptimization happens, this function returns the point of next bytecode to continue execution
287 address AbstractInterpreter::deopt_continue_after_entry(methodOop method, address bcp, int callee_parameters, bool is_top_frame) {
288 assert(method->contains(bcp), "just checkin'");
289 Bytecodes::Code code = Bytecodes::java_code_at(bcp);
290 assert(!Interpreter::bytecode_should_reexecute(code), "should not reexecute");
291 int bci = method->bci_from(bcp);
292 int length = -1; // initial value for debugging
293 // compute continuation length
294 length = Bytecodes::length_at(bcp);
295 // compute result type
296 BasicType type = T_ILLEGAL;
297
298 switch (code) {
299 case Bytecodes::_invokevirtual :
300 case Bytecodes::_invokespecial :
301 case Bytecodes::_invokestatic :
302 case Bytecodes::_invokeinterface: {
303 Thread *thread = Thread::current();
304 ResourceMark rm(thread);
305 methodHandle mh(thread, method);
306 type = Bytecode_invoke_at(mh, bci)->result_type(thread);
307 // since the cache entry might not be initialized:
308 // (NOT needed for the old calling convension)
309 if (!is_top_frame) {
310 int index = Bytes::get_native_u2(bcp+1);
311 method->constants()->cache()->entry_at(index)->set_parameter_size(callee_parameters);
312 }
313 break;
314 }
315
316 case Bytecodes::_invokedynamic: {
317 Thread *thread = Thread::current();
318 ResourceMark rm(thread);
319 methodHandle mh(thread, method);
320 type = Bytecode_invoke_at(mh, bci)->result_type(thread);
321 // since the cache entry might not be initialized:
322 // (NOT needed for the old calling convension)
323 if (!is_top_frame) {
324 int index = Bytes::get_native_u4(bcp+1);
325 method->constants()->cache()->secondary_entry_at(index)->set_parameter_size(callee_parameters);
326 }
327 break;
328 }
329
330 case Bytecodes::_ldc :
331 case Bytecodes::_ldc_w : // fall through
332 case Bytecodes::_ldc2_w:
333 {
334 Thread *thread = Thread::current();
335 ResourceMark rm(thread);
336 methodHandle mh(thread, method);
337 type = Bytecode_loadconstant_at(mh, bci)->result_type();
338 break;
339 }
340
341 default:
342 type = Bytecodes::result_type(code);
343 break;
344 }
345
346 // return entry point for computed continuation state & bytecode length
347 return
348 is_top_frame
349 ? Interpreter::deopt_entry (as_TosState(type), length)
350 : Interpreter::return_entry(as_TosState(type), length);
351 }
352
353 // If deoptimization happens, this function returns the point where the interpreter reexecutes
354 // the bytecode.
355 // Note: Bytecodes::_athrow is a special case in that it does not return
356 // Interpreter::deopt_entry(vtos, 0) like others
357 address AbstractInterpreter::deopt_reexecute_entry(methodOop method, address bcp) {
358 assert(method->contains(bcp), "just checkin'");
359 Bytecodes::Code code = Bytecodes::java_code_at(bcp);
360 #ifdef COMPILER1
361 if(code == Bytecodes::_athrow ) {
362 return Interpreter::rethrow_exception_entry();
363 }
364 #endif /* COMPILER1 */
365 return Interpreter::deopt_entry(vtos, 0);
366 }
367
368 // If deoptimization happens, the interpreter should reexecute these bytecodes.
369 // This function mainly helps the compilers to set up the reexecute bit.
370 bool AbstractInterpreter::bytecode_should_reexecute(Bytecodes::Code code) {
371 switch (code) {
372 case Bytecodes::_lookupswitch:
373 case Bytecodes::_tableswitch:
374 case Bytecodes::_fast_binaryswitch:
375 case Bytecodes::_fast_linearswitch:
376 // recompute condtional expression folded into _if<cond>
377 case Bytecodes::_lcmp :
378 case Bytecodes::_fcmpl :
379 case Bytecodes::_fcmpg :
380 case Bytecodes::_dcmpl :
381 case Bytecodes::_dcmpg :
382 case Bytecodes::_ifnull :
383 case Bytecodes::_ifnonnull :
384 case Bytecodes::_goto :
385 case Bytecodes::_goto_w :
386 case Bytecodes::_ifeq :
387 case Bytecodes::_ifne :
388 case Bytecodes::_iflt :
389 case Bytecodes::_ifge :
390 case Bytecodes::_ifgt :
391 case Bytecodes::_ifle :
392 case Bytecodes::_if_icmpeq :
393 case Bytecodes::_if_icmpne :
394 case Bytecodes::_if_icmplt :
395 case Bytecodes::_if_icmpge :
396 case Bytecodes::_if_icmpgt :
397 case Bytecodes::_if_icmple :
398 case Bytecodes::_if_acmpeq :
399 case Bytecodes::_if_acmpne :
400 // special cases
401 case Bytecodes::_getfield :
402 case Bytecodes::_putfield :
403 case Bytecodes::_getstatic :
404 case Bytecodes::_putstatic :
405 case Bytecodes::_aastore :
406 #ifdef COMPILER1
407 //special case of reexecution
408 case Bytecodes::_athrow :
409 #endif
410 return true;
411
412 default:
413 return false;
414 }
415 }
416
417 void AbstractInterpreterGenerator::bang_stack_shadow_pages(bool native_call) {
418 // Quick & dirty stack overflow checking: bang the stack & handle trap.
419 // Note that we do the banging after the frame is setup, since the exception
420 // handling code expects to find a valid interpreter frame on the stack.
421 // Doing the banging earlier fails if the caller frame is not an interpreter
422 // frame.
423 // (Also, the exception throwing code expects to unlock any synchronized
424 // method receiever, so do the banging after locking the receiver.)
425
426 // Bang each page in the shadow zone. We can't assume it's been done for
427 // an interpreter frame with greater than a page of locals, so each page
428 // needs to be checked. Only true for non-native.
429 if (UseStackBanging) {
430 const int start_page = native_call ? StackShadowPages : 1;
431 const int page_size = os::vm_page_size();
432 for (int pages = start_page; pages <= StackShadowPages ; pages++) {
433 __ bang_stack_with_offset(pages*page_size);
434 }
435 }
436 }