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