1 /*
2 * Copyright (c) 2008, 2017, 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 "classfile/javaClasses.inline.hpp"
28 #include "interpreter/interpreter.hpp"
29 #include "interpreter/interp_masm.hpp"
30 #include "memory/allocation.inline.hpp"
31 #include "memory/resourceArea.hpp"
32 #include "prims/methodHandles.hpp"
33
34 #define __ _masm->
35
36 #ifdef PRODUCT
37 #define BLOCK_COMMENT(str) /* nothing */
38 #define STOP(error) stop(error)
39 #else
40 #define BLOCK_COMMENT(str) __ block_comment(str)
41 #define STOP(error) block_comment(error); __ stop(error)
42 #endif
43
44 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":")
45
46 // Workaround for C++ overloading nastiness on '0' for RegisterOrConstant.
47 static RegisterOrConstant constant(int value) {
48 return RegisterOrConstant(value);
49 }
50
51 void MethodHandles::load_klass_from_Class(MacroAssembler* _masm, Register klass_reg, Register temp_reg, Register temp2_reg) {
52 if (VerifyMethodHandles)
53 verify_klass(_masm, klass_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_Class), temp_reg, temp2_reg,
54 "MH argument is a Class");
55 __ ld_ptr(Address(klass_reg, java_lang_Class::klass_offset_in_bytes()), klass_reg);
56 }
57
58 #ifdef ASSERT
59 static int check_nonzero(const char* xname, int x) {
60 assert(x != 0, "%s should be nonzero", xname);
61 return x;
62 }
63 #define NONZERO(x) check_nonzero(#x, x)
64 #else //ASSERT
65 #define NONZERO(x) (x)
66 #endif //ASSERT
67
68 #ifdef ASSERT
69 void MethodHandles::verify_klass(MacroAssembler* _masm,
70 Register obj_reg, SystemDictionary::WKID klass_id,
71 Register temp_reg, Register temp2_reg,
72 const char* error_message) {
73 InstanceKlass** klass_addr = SystemDictionary::well_known_klass_addr(klass_id);
74 Klass* klass = SystemDictionary::well_known_klass(klass_id);
75 bool did_save = false;
76 if (temp_reg == noreg || temp2_reg == noreg) {
77 temp_reg = L1;
78 temp2_reg = L2;
79 __ save_frame_and_mov(0, obj_reg, L0);
80 obj_reg = L0;
81 did_save = true;
82 }
83 Label L_ok, L_bad;
84 BLOCK_COMMENT("verify_klass {");
85 __ verify_oop(obj_reg);
86 __ br_null_short(obj_reg, Assembler::pn, L_bad);
87 __ load_klass(obj_reg, temp_reg);
88 __ set(ExternalAddress((Metadata**)klass_addr), temp2_reg);
89 __ ld_ptr(Address(temp2_reg, 0), temp2_reg);
90 __ cmp_and_brx_short(temp_reg, temp2_reg, Assembler::equal, Assembler::pt, L_ok);
91 intptr_t super_check_offset = klass->super_check_offset();
92 __ ld_ptr(Address(temp_reg, super_check_offset), temp_reg);
93 __ set(ExternalAddress((Metadata**)klass_addr), temp2_reg);
94 __ ld_ptr(Address(temp2_reg, 0), temp2_reg);
95 __ cmp_and_brx_short(temp_reg, temp2_reg, Assembler::equal, Assembler::pt, L_ok);
96 __ BIND(L_bad);
97 if (did_save) __ restore();
98 __ STOP(error_message);
99 __ BIND(L_ok);
100 if (did_save) __ restore();
101 BLOCK_COMMENT("} verify_klass");
102 }
103
104 void MethodHandles::verify_ref_kind(MacroAssembler* _masm, int ref_kind, Register member_reg, Register temp) {
105 Label L;
106 BLOCK_COMMENT("verify_ref_kind {");
107 __ lduw(Address(member_reg, NONZERO(java_lang_invoke_MemberName::flags_offset_in_bytes())), temp);
108 __ srl( temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT, temp);
109 __ and3(temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK, temp);
110 __ cmp_and_br_short(temp, ref_kind, Assembler::equal, Assembler::pt, L);
111 { char* buf = NEW_C_HEAP_ARRAY(char, 100, mtInternal);
112 jio_snprintf(buf, 100, "verify_ref_kind expected %x", ref_kind);
113 if (ref_kind == JVM_REF_invokeVirtual ||
114 ref_kind == JVM_REF_invokeSpecial)
115 // could do this for all ref_kinds, but would explode assembly code size
116 trace_method_handle(_masm, buf);
117 __ STOP(buf);
118 }
119 BLOCK_COMMENT("} verify_ref_kind");
120 __ bind(L);
121 }
122
123 #endif // ASSERT
124
125 void MethodHandles::jump_from_method_handle(MacroAssembler* _masm, Register method, Register target, Register temp,
126 bool for_compiler_entry) {
127 Label L_no_such_method;
128 assert(method == G5_method, "interpreter calling convention");
129 assert_different_registers(method, target, temp);
130
131 if (!for_compiler_entry && JvmtiExport::can_post_interpreter_events()) {
132 Label run_compiled_code;
133 // JVMTI events, such as single-stepping, are implemented partly by avoiding running
134 // compiled code in threads for which the event is enabled. Check here for
135 // interp_only_mode if these events CAN be enabled.
136 __ verify_thread();
137 const Address interp_only(G2_thread, JavaThread::interp_only_mode_offset());
138 __ ld(interp_only, temp);
139 __ cmp_and_br_short(temp, 0, Assembler::zero, Assembler::pt, run_compiled_code);
140 // Null method test is replicated below in compiled case,
141 // it might be able to address across the verify_thread()
142 __ br_null_short(G5_method, Assembler::pn, L_no_such_method);
143 __ ld_ptr(G5_method, in_bytes(Method::interpreter_entry_offset()), target);
144 __ jmp(target, 0);
145 __ delayed()->nop();
146 __ BIND(run_compiled_code);
147 // Note: we could fill some delay slots here, but
148 // it doesn't matter, since this is interpreter code.
149 }
150
151 // Compiled case, either static or fall-through from runtime conditional
152 __ br_null_short(G5_method, Assembler::pn, L_no_such_method);
153
154 const ByteSize entry_offset = for_compiler_entry ? Method::from_compiled_offset() :
155 Method::from_interpreted_offset();
156 __ ld_ptr(G5_method, in_bytes(entry_offset), target);
157 __ jmp(target, 0);
158 __ delayed()->nop();
159
160 __ bind(L_no_such_method);
161 AddressLiteral ame(StubRoutines::throw_AbstractMethodError_entry());
162 __ jump_to(ame, temp);
163 __ delayed()->nop();
164 }
165
166 void MethodHandles::jump_to_lambda_form(MacroAssembler* _masm,
167 Register recv, Register method_temp,
168 Register temp2, Register temp3,
169 bool for_compiler_entry) {
170 BLOCK_COMMENT("jump_to_lambda_form {");
171 // This is the initial entry point of a lazy method handle.
172 // After type checking, it picks up the invoker from the LambdaForm.
173 assert_different_registers(recv, method_temp, temp2); // temp3 is only passed on
174 assert(method_temp == G5_method, "required register for loading method");
175
176 //NOT_PRODUCT({ FlagSetting fs(TraceMethodHandles, true); trace_method_handle(_masm, "LZMH"); });
177
178 // Load the invoker, as MH -> MH.form -> LF.vmentry
179 __ verify_oop(recv);
180 __ load_heap_oop(Address(recv, NONZERO(java_lang_invoke_MethodHandle::form_offset_in_bytes())), method_temp);
181 __ verify_oop(method_temp);
182 __ load_heap_oop(Address(method_temp, NONZERO(java_lang_invoke_LambdaForm::vmentry_offset_in_bytes())), method_temp);
183 __ verify_oop(method_temp);
184 __ load_heap_oop(Address(method_temp, NONZERO(java_lang_invoke_MemberName::method_offset_in_bytes())), method_temp);
185 __ verify_oop(method_temp);
186 __ ld_ptr( Address(method_temp, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset_in_bytes())), method_temp);
187
188 if (VerifyMethodHandles && !for_compiler_entry) {
189 // make sure recv is already on stack
190 __ ld_ptr(method_temp, in_bytes(Method::const_offset()), temp2);
191 __ load_sized_value(Address(temp2, ConstMethod::size_of_parameters_offset()),
192 temp2,
193 sizeof(u2), /*is_signed*/ false);
194 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), "");
195 Label L;
196 __ ld_ptr(__ argument_address(temp2, temp2, -1), temp2);
197 __ cmp_and_br_short(temp2, recv, Assembler::equal, Assembler::pt, L);
198 __ STOP("receiver not on stack");
199 __ BIND(L);
200 }
201
202 jump_from_method_handle(_masm, method_temp, temp2, temp3, for_compiler_entry);
203 BLOCK_COMMENT("} jump_to_lambda_form");
204 }
205
206
207 // Code generation
208 address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm,
209 vmIntrinsics::ID iid) {
210 const bool not_for_compiler_entry = false; // this is the interpreter entry
211 assert(is_signature_polymorphic(iid), "expected invoke iid");
212 if (iid == vmIntrinsics::_invokeGeneric ||
213 iid == vmIntrinsics::_compiledLambdaForm) {
214 // Perhaps surprisingly, the symbolic references visible to Java are not directly used.
215 // They are linked to Java-generated adapters via MethodHandleNatives.linkMethod.
216 // They all allow an appendix argument.
217 __ should_not_reach_here(); // empty stubs make SG sick
218 return NULL;
219 }
220
221 // I5_savedSP/O5_savedSP: sender SP (must preserve; see prepare_to_jump_from_interpreted)
222 // G5_method: Method*
223 // G4 (Gargs): incoming argument list (must preserve)
224 // O0: used as temp to hold mh or receiver
225 // O1, O4: garbage temps, blown away
226 Register O1_scratch = O1;
227 Register O4_param_size = O4; // size of parameters
228
229 // here's where control starts out:
230 __ align(CodeEntryAlignment);
231 address entry_point = __ pc();
232
233 if (VerifyMethodHandles) {
234 assert(Method::intrinsic_id_size_in_bytes() == 2, "assuming Method::_intrinsic_id is u2");
235
236 Label L;
237 BLOCK_COMMENT("verify_intrinsic_id {");
238 __ lduh(Address(G5_method, Method::intrinsic_id_offset_in_bytes()), O1_scratch);
239 __ cmp_and_br_short(O1_scratch, (int) iid, Assembler::equal, Assembler::pt, L);
240 if (iid == vmIntrinsics::_linkToVirtual ||
241 iid == vmIntrinsics::_linkToSpecial) {
242 // could do this for all kinds, but would explode assembly code size
243 trace_method_handle(_masm, "bad Method*::intrinsic_id");
244 }
245 __ STOP("bad Method*::intrinsic_id");
246 __ bind(L);
247 BLOCK_COMMENT("} verify_intrinsic_id");
248 }
249
250 // First task: Find out how big the argument list is.
251 Address O4_first_arg_addr;
252 int ref_kind = signature_polymorphic_intrinsic_ref_kind(iid);
253 assert(ref_kind != 0 || iid == vmIntrinsics::_invokeBasic, "must be _invokeBasic or a linkTo intrinsic");
254 if (ref_kind == 0 || MethodHandles::ref_kind_has_receiver(ref_kind)) {
255 __ ld_ptr(G5_method, in_bytes(Method::const_offset()), O4_param_size);
256 __ load_sized_value(Address(O4_param_size, ConstMethod::size_of_parameters_offset()),
257 O4_param_size,
258 sizeof(u2), /*is_signed*/ false);
259 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), "");
260 O4_first_arg_addr = __ argument_address(O4_param_size, O4_param_size, -1);
261 } else {
262 DEBUG_ONLY(O4_param_size = noreg);
263 }
264
265 Register O0_mh = noreg;
266 if (!is_signature_polymorphic_static(iid)) {
267 __ ld_ptr(O4_first_arg_addr, O0_mh = O0);
268 DEBUG_ONLY(O4_param_size = noreg);
269 }
270
271 // O4_first_arg_addr is live!
272
273 if (TraceMethodHandles) {
274 if (O0_mh != noreg)
275 __ mov(O0_mh, G3_method_handle); // make stub happy
276 trace_method_handle_interpreter_entry(_masm, iid);
277 }
278
279 if (iid == vmIntrinsics::_invokeBasic) {
280 generate_method_handle_dispatch(_masm, iid, O0_mh, noreg, not_for_compiler_entry);
281
282 } else {
283 // Adjust argument list by popping the trailing MemberName argument.
284 Register O0_recv = noreg;
285 if (MethodHandles::ref_kind_has_receiver(ref_kind)) {
286 // Load the receiver (not the MH; the actual MemberName's receiver) up from the interpreter stack.
287 __ ld_ptr(O4_first_arg_addr, O0_recv = O0);
288 DEBUG_ONLY(O4_param_size = noreg);
289 }
290 Register G5_member = G5_method; // MemberName ptr; incoming method ptr is dead now
291 __ ld_ptr(__ argument_address(constant(0)), G5_member);
292 __ add(Gargs, Interpreter::stackElementSize, Gargs);
293 generate_method_handle_dispatch(_masm, iid, O0_recv, G5_member, not_for_compiler_entry);
294 }
295
296 return entry_point;
297 }
298
299 void MethodHandles::generate_method_handle_dispatch(MacroAssembler* _masm,
300 vmIntrinsics::ID iid,
301 Register receiver_reg,
302 Register member_reg,
303 bool for_compiler_entry) {
304 assert(is_signature_polymorphic(iid), "expected invoke iid");
305 Register temp1 = (for_compiler_entry ? G1_scratch : O1);
306 Register temp2 = (for_compiler_entry ? G3_scratch : O2);
307 Register temp3 = (for_compiler_entry ? G4_scratch : O3);
308 Register temp4 = (for_compiler_entry ? noreg : O4);
309 if (for_compiler_entry) {
310 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : O0), "only valid assignment");
311 assert_different_registers(temp1, O0, O1, O2, O3, O4, O5);
312 assert_different_registers(temp2, O0, O1, O2, O3, O4, O5);
313 assert_different_registers(temp3, O0, O1, O2, O3, O4, O5);
314 assert_different_registers(temp4, O0, O1, O2, O3, O4, O5);
315 } else {
316 assert_different_registers(temp1, temp2, temp3, temp4, O5_savedSP); // don't trash lastSP
317 }
318 if (receiver_reg != noreg) assert_different_registers(temp1, temp2, temp3, temp4, receiver_reg);
319 if (member_reg != noreg) assert_different_registers(temp1, temp2, temp3, temp4, member_reg);
320
321 if (iid == vmIntrinsics::_invokeBasic) {
322 // indirect through MH.form.vmentry.vmtarget
323 jump_to_lambda_form(_masm, receiver_reg, G5_method, temp1, temp2, for_compiler_entry);
324
325 } else {
326 // The method is a member invoker used by direct method handles.
327 if (VerifyMethodHandles) {
328 // make sure the trailing argument really is a MemberName (caller responsibility)
329 verify_klass(_masm, member_reg, SystemDictionary::WK_KLASS_ENUM_NAME(MemberName_klass),
330 temp1, temp2,
331 "MemberName required for invokeVirtual etc.");
332 }
333
334 Address member_clazz( member_reg, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes()));
335 Address member_vmindex( member_reg, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes()));
336 Address member_vmtarget( member_reg, NONZERO(java_lang_invoke_MemberName::method_offset_in_bytes()));
337 Address vmtarget_method( G5_method, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset_in_bytes()));
338
339 Register temp1_recv_klass = temp1;
340 if (iid != vmIntrinsics::_linkToStatic) {
341 __ verify_oop(receiver_reg);
342 if (iid == vmIntrinsics::_linkToSpecial) {
343 // Don't actually load the klass; just null-check the receiver.
344 __ null_check(receiver_reg);
345 } else {
346 // load receiver klass itself
347 __ null_check(receiver_reg, oopDesc::klass_offset_in_bytes());
348 __ load_klass(receiver_reg, temp1_recv_klass);
349 __ verify_klass_ptr(temp1_recv_klass);
350 }
351 BLOCK_COMMENT("check_receiver {");
352 // The receiver for the MemberName must be in receiver_reg.
353 // Check the receiver against the MemberName.clazz
354 if (VerifyMethodHandles && iid == vmIntrinsics::_linkToSpecial) {
355 // Did not load it above...
356 __ load_klass(receiver_reg, temp1_recv_klass);
357 __ verify_klass_ptr(temp1_recv_klass);
358 }
359 if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) {
360 Label L_ok;
361 Register temp2_defc = temp2;
362 __ load_heap_oop(member_clazz, temp2_defc);
363 load_klass_from_Class(_masm, temp2_defc, temp3, temp4);
364 __ verify_klass_ptr(temp2_defc);
365 __ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, temp4, L_ok);
366 // If we get here, the type check failed!
367 __ STOP("receiver class disagrees with MemberName.clazz");
368 __ bind(L_ok);
369 }
370 BLOCK_COMMENT("} check_receiver");
371 }
372 if (iid == vmIntrinsics::_linkToSpecial ||
373 iid == vmIntrinsics::_linkToStatic) {
374 DEBUG_ONLY(temp1_recv_klass = noreg); // these guys didn't load the recv_klass
375 }
376
377 // Live registers at this point:
378 // member_reg - MemberName that was the trailing argument
379 // temp1_recv_klass - klass of stacked receiver, if needed
380 // O5_savedSP - interpreter linkage (if interpreted)
381 // O0..O5 - compiler arguments (if compiled)
382
383 Label L_incompatible_class_change_error;
384 switch (iid) {
385 case vmIntrinsics::_linkToSpecial:
386 if (VerifyMethodHandles) {
387 verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp2);
388 }
389 __ load_heap_oop(member_vmtarget, G5_method);
390 __ ld_ptr(vmtarget_method, G5_method);
391 break;
392
393 case vmIntrinsics::_linkToStatic:
394 if (VerifyMethodHandles) {
395 verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp2);
396 }
397 __ load_heap_oop(member_vmtarget, G5_method);
398 __ ld_ptr(vmtarget_method, G5_method);
399 break;
400
401 case vmIntrinsics::_linkToVirtual:
402 {
403 // same as TemplateTable::invokevirtual,
404 // minus the CP setup and profiling:
405
406 if (VerifyMethodHandles) {
407 verify_ref_kind(_masm, JVM_REF_invokeVirtual, member_reg, temp2);
408 }
409
410 // pick out the vtable index from the MemberName, and then we can discard it:
411 Register temp2_index = temp2;
412 __ ld_ptr(member_vmindex, temp2_index);
413
414 if (VerifyMethodHandles) {
415 Label L_index_ok;
416 __ cmp_and_br_short(temp2_index, (int) 0, Assembler::greaterEqual, Assembler::pn, L_index_ok);
417 __ STOP("no virtual index");
418 __ BIND(L_index_ok);
419 }
420
421 // Note: The verifier invariants allow us to ignore MemberName.clazz and vmtarget
422 // at this point. And VerifyMethodHandles has already checked clazz, if needed.
423
424 // get target Method* & entry point
425 __ lookup_virtual_method(temp1_recv_klass, temp2_index, G5_method);
426 break;
427 }
428
429 case vmIntrinsics::_linkToInterface:
430 {
431 // same as TemplateTable::invokeinterface
432 // (minus the CP setup and profiling, with different argument motion)
433 if (VerifyMethodHandles) {
434 verify_ref_kind(_masm, JVM_REF_invokeInterface, member_reg, temp2);
435 }
436
437 Register temp2_intf = temp2;
438 __ load_heap_oop(member_clazz, temp2_intf);
439 load_klass_from_Class(_masm, temp2_intf, temp3, temp4);
440 __ verify_klass_ptr(temp2_intf);
441
442 Register G5_index = G5_method;
443 __ ld_ptr(member_vmindex, G5_index);
444 if (VerifyMethodHandles) {
445 Label L;
446 __ cmp_and_br_short(G5_index, 0, Assembler::greaterEqual, Assembler::pt, L);
447 __ STOP("invalid vtable index for MH.invokeInterface");
448 __ bind(L);
449 }
450
451 // given intf, index, and recv klass, dispatch to the implementation method
452 __ lookup_interface_method(temp1_recv_klass, temp2_intf,
453 // note: next two args must be the same:
454 G5_index, G5_method,
455 temp3, temp4,
456 L_incompatible_class_change_error);
457 break;
458 }
459
460 default:
461 fatal("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid));
462 break;
463 }
464
465 // Live at this point:
466 // G5_method
467 // O5_savedSP (if interpreted)
468
469 // After figuring out which concrete method to call, jump into it.
470 // Note that this works in the interpreter with no data motion.
471 // But the compiled version will require that rcx_recv be shifted out.
472 __ verify_method_ptr(G5_method);
473 jump_from_method_handle(_masm, G5_method, temp1, temp2, for_compiler_entry);
474
475 if (iid == vmIntrinsics::_linkToInterface) {
476 __ BIND(L_incompatible_class_change_error);
477 AddressLiteral icce(StubRoutines::throw_IncompatibleClassChangeError_entry());
478 __ jump_to(icce, temp1);
479 __ delayed()->nop();
480 }
481 }
482 }
483
484 #ifndef PRODUCT
485 void trace_method_handle_stub(const char* adaptername,
486 oopDesc* mh,
487 intptr_t* saved_sp,
488 intptr_t* args,
489 intptr_t* tracing_fp) {
490 bool has_mh = (strstr(adaptername, "/static") == NULL &&
491 strstr(adaptername, "linkTo") == NULL); // static linkers don't have MH
492 const char* mh_reg_name = has_mh ? "G3_mh" : "G3";
493 tty->print_cr("MH %s %s=" INTPTR_FORMAT " saved_sp=" INTPTR_FORMAT " args=" INTPTR_FORMAT,
494 adaptername, mh_reg_name,
495 p2i(mh), p2i(saved_sp), p2i(args));
496
497 if (Verbose) {
498 // dumping last frame with frame::describe
499
500 JavaThread* p = JavaThread::active();
501
502 ResourceMark rm;
503 PRESERVE_EXCEPTION_MARK; // may not be needed by safer and unexpensive here
504 FrameValues values;
505
506 // Note: We want to allow trace_method_handle from any call site.
507 // While trace_method_handle creates a frame, it may be entered
508 // without a valid return PC in O7 (e.g. not just after a call).
509 // Walking that frame could lead to failures due to that invalid PC.
510 // => carefully detect that frame when doing the stack walking
511
512 // walk up to the right frame using the "tracing_fp" argument
513 intptr_t* cur_sp = StubRoutines::Sparc::flush_callers_register_windows_func()();
514 frame cur_frame(cur_sp, frame::unpatchable, NULL);
515
516 while (cur_frame.fp() != (intptr_t *)(STACK_BIAS+(uintptr_t)tracing_fp)) {
517 cur_frame = os::get_sender_for_C_frame(&cur_frame);
518 }
519
520 // safely create a frame and call frame::describe
521 intptr_t *dump_sp = cur_frame.sender_sp();
522 intptr_t *dump_fp = cur_frame.link();
523
524 bool walkable = has_mh; // whether the traced frame shoud be walkable
525
526 // the sender for cur_frame is the caller of trace_method_handle
527 if (walkable) {
528 // The previous definition of walkable may have to be refined
529 // if new call sites cause the next frame constructor to start
530 // failing. Alternatively, frame constructors could be
531 // modified to support the current or future non walkable
532 // frames (but this is more intrusive and is not considered as
533 // part of this RFE, which will instead use a simpler output).
534 frame dump_frame = frame(dump_sp,
535 cur_frame.sp(), // younger_sp
536 false); // no adaptation
537 dump_frame.describe(values, 1);
538 } else {
539 // Robust dump for frames which cannot be constructed from sp/younger_sp
540 // Add descriptions without building a Java frame to avoid issues
541 values.describe(-1, dump_fp, "fp for #1 <not parsed, cannot trust pc>");
542 values.describe(-1, dump_sp, "sp");
543 }
544
545 bool has_args = has_mh; // whether Gargs is meaningful
546
547 // mark args, if seems valid (may not be valid for some adapters)
548 if (has_args) {
549 if ((args >= dump_sp) && (args < dump_fp)) {
550 values.describe(-1, args, "*G4_args");
551 }
552 }
553
554 // mark saved_sp, if seems valid (may not be valid for some adapters)
555 intptr_t *unbiased_sp = (intptr_t *)(STACK_BIAS+(uintptr_t)saved_sp);
556 const int ARG_LIMIT = 255, SLOP = 45, UNREASONABLE_STACK_MOVE = (ARG_LIMIT + SLOP);
557 if ((unbiased_sp >= dump_sp - UNREASONABLE_STACK_MOVE) && (unbiased_sp < dump_fp)) {
558 values.describe(-1, unbiased_sp, "*saved_sp+STACK_BIAS");
559 }
560
561 // Note: the unextended_sp may not be correct
562 tty->print_cr(" stack layout:");
563 values.print(p);
564 if (has_mh && mh->is_oop()) {
565 mh->print();
566 if (java_lang_invoke_MethodHandle::is_instance(mh)) {
567 if (java_lang_invoke_MethodHandle::form_offset_in_bytes() != 0)
568 java_lang_invoke_MethodHandle::form(mh)->print();
569 }
570 }
571 }
572 }
573
574 void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) {
575 if (!TraceMethodHandles) return;
576 BLOCK_COMMENT("trace_method_handle {");
577 // save: Gargs, O5_savedSP
578 __ save_frame(16); // need space for saving required FPU state
579
580 __ set((intptr_t) adaptername, O0);
581 __ mov(G3_method_handle, O1);
582 __ mov(I5_savedSP, O2);
583 __ mov(Gargs, O3);
584 __ mov(I6, O4); // frame identifier for safe stack walking
585
586 // Save scratched registers that might be needed. Robustness is more
587 // important than optimizing the saves for this debug only code.
588
589 // save FP result, valid at some call sites (adapter_opt_return_float, ...)
590 Address d_save(FP, -sizeof(jdouble) + STACK_BIAS);
591 __ stf(FloatRegisterImpl::D, Ftos_d, d_save);
592 // Safely save all globals but G2 (handled by call_VM_leaf) and G7
593 // (OS reserved).
594 __ mov(G3_method_handle, L3);
595 __ mov(Gargs, L4);
596 __ mov(G5_method_type, L5);
597 __ mov(G6, L6);
598 __ mov(G1, L1);
599
600 __ call_VM_leaf(L2 /* for G2 */, CAST_FROM_FN_PTR(address, trace_method_handle_stub));
601
602 __ mov(L3, G3_method_handle);
603 __ mov(L4, Gargs);
604 __ mov(L5, G5_method_type);
605 __ mov(L6, G6);
606 __ mov(L1, G1);
607 __ ldf(FloatRegisterImpl::D, d_save, Ftos_d);
608
609 __ restore();
610 BLOCK_COMMENT("} trace_method_handle");
611 }
612 #endif // PRODUCT