1 /*
2 * Copyright (c) 2008, 2016, 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 KlassHandle 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 // the following assumes that a Method* is normally compressed in the vmtarget field:
185 __ ld_ptr( Address(method_temp, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes())), method_temp);
186
187 if (VerifyMethodHandles && !for_compiler_entry) {
188 // make sure recv is already on stack
189 __ ld_ptr(method_temp, in_bytes(Method::const_offset()), temp2);
190 __ load_sized_value(Address(temp2, ConstMethod::size_of_parameters_offset()),
191 temp2,
192 sizeof(u2), /*is_signed*/ false);
193 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), "");
194 Label L;
195 __ ld_ptr(__ argument_address(temp2, temp2, -1), temp2);
196 __ cmp_and_br_short(temp2, recv, Assembler::equal, Assembler::pt, L);
197 __ STOP("receiver not on stack");
198 __ BIND(L);
199 }
200
201 jump_from_method_handle(_masm, method_temp, temp2, temp3, for_compiler_entry);
202 BLOCK_COMMENT("} jump_to_lambda_form");
203 }
204
205
206 // Code generation
207 address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm,
208 vmIntrinsics::ID iid) {
209 const bool not_for_compiler_entry = false; // this is the interpreter entry
210 assert(is_signature_polymorphic(iid), "expected invoke iid");
211 if (iid == vmIntrinsics::_invokeGeneric ||
212 iid == vmIntrinsics::_compiledLambdaForm) {
213 // Perhaps surprisingly, the symbolic references visible to Java are not directly used.
214 // They are linked to Java-generated adapters via MethodHandleNatives.linkMethod.
215 // They all allow an appendix argument.
216 __ should_not_reach_here(); // empty stubs make SG sick
217 return NULL;
218 }
219
220 // I5_savedSP/O5_savedSP: sender SP (must preserve; see prepare_to_jump_from_interpreted)
221 // G5_method: Method*
222 // G4 (Gargs): incoming argument list (must preserve)
223 // O0: used as temp to hold mh or receiver
224 // O1, O4: garbage temps, blown away
225 Register O1_scratch = O1;
226 Register O4_param_size = O4; // size of parameters
227
228 // here's where control starts out:
229 __ align(CodeEntryAlignment);
230 address entry_point = __ pc();
231
232 if (VerifyMethodHandles) {
233 assert(Method::intrinsic_id_size_in_bytes() == 2, "assuming Method::_intrinsic_id is u2");
234
235 Label L;
236 BLOCK_COMMENT("verify_intrinsic_id {");
237 __ lduh(Address(G5_method, Method::intrinsic_id_offset_in_bytes()), O1_scratch);
238 __ cmp_and_br_short(O1_scratch, (int) iid, Assembler::equal, Assembler::pt, L);
239 if (iid == vmIntrinsics::_linkToVirtual ||
240 iid == vmIntrinsics::_linkToSpecial) {
241 // could do this for all kinds, but would explode assembly code size
242 trace_method_handle(_masm, "bad Method*::intrinsic_id");
243 }
244 __ STOP("bad Method*::intrinsic_id");
245 __ bind(L);
246 BLOCK_COMMENT("} verify_intrinsic_id");
247 }
248
249 // First task: Find out how big the argument list is.
250 Address O4_first_arg_addr;
251 int ref_kind = signature_polymorphic_intrinsic_ref_kind(iid);
252 assert(ref_kind != 0 || iid == vmIntrinsics::_invokeBasic, "must be _invokeBasic or a linkTo intrinsic");
253 if (ref_kind == 0 || MethodHandles::ref_kind_has_receiver(ref_kind)) {
254 __ ld_ptr(G5_method, in_bytes(Method::const_offset()), O4_param_size);
255 __ load_sized_value(Address(O4_param_size, ConstMethod::size_of_parameters_offset()),
256 O4_param_size,
257 sizeof(u2), /*is_signed*/ false);
258 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), "");
259 O4_first_arg_addr = __ argument_address(O4_param_size, O4_param_size, -1);
260 } else {
261 DEBUG_ONLY(O4_param_size = noreg);
262 }
263
264 Register O0_mh = noreg;
265 if (!is_signature_polymorphic_static(iid)) {
266 __ ld_ptr(O4_first_arg_addr, O0_mh = O0);
267 DEBUG_ONLY(O4_param_size = noreg);
268 }
269
270 // O4_first_arg_addr is live!
271
272 if (TraceMethodHandles) {
273 if (O0_mh != noreg)
274 __ mov(O0_mh, G3_method_handle); // make stub happy
275 trace_method_handle_interpreter_entry(_masm, iid);
276 }
277
278 if (iid == vmIntrinsics::_invokeBasic) {
279 generate_method_handle_dispatch(_masm, iid, O0_mh, noreg, not_for_compiler_entry);
280
281 } else {
282 // Adjust argument list by popping the trailing MemberName argument.
283 Register O0_recv = noreg;
284 if (MethodHandles::ref_kind_has_receiver(ref_kind)) {
285 // Load the receiver (not the MH; the actual MemberName's receiver) up from the interpreter stack.
286 __ ld_ptr(O4_first_arg_addr, O0_recv = O0);
287 DEBUG_ONLY(O4_param_size = noreg);
288 }
289 Register G5_member = G5_method; // MemberName ptr; incoming method ptr is dead now
290 __ ld_ptr(__ argument_address(constant(0)), G5_member);
291 __ add(Gargs, Interpreter::stackElementSize, Gargs);
292 generate_method_handle_dispatch(_masm, iid, O0_recv, G5_member, not_for_compiler_entry);
293 }
294
295 return entry_point;
296 }
297
298 void MethodHandles::generate_method_handle_dispatch(MacroAssembler* _masm,
299 vmIntrinsics::ID iid,
300 Register receiver_reg,
301 Register member_reg,
302 bool for_compiler_entry) {
303 assert(is_signature_polymorphic(iid), "expected invoke iid");
304 Register temp1 = (for_compiler_entry ? G1_scratch : O1);
305 Register temp2 = (for_compiler_entry ? G3_scratch : O2);
306 Register temp3 = (for_compiler_entry ? G4_scratch : O3);
307 Register temp4 = (for_compiler_entry ? noreg : O4);
308 if (for_compiler_entry) {
309 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : O0), "only valid assignment");
310 assert_different_registers(temp1, O0, O1, O2, O3, O4, O5);
311 assert_different_registers(temp2, O0, O1, O2, O3, O4, O5);
312 assert_different_registers(temp3, O0, O1, O2, O3, O4, O5);
313 assert_different_registers(temp4, O0, O1, O2, O3, O4, O5);
314 } else {
315 assert_different_registers(temp1, temp2, temp3, temp4, O5_savedSP); // don't trash lastSP
316 }
317 if (receiver_reg != noreg) assert_different_registers(temp1, temp2, temp3, temp4, receiver_reg);
318 if (member_reg != noreg) assert_different_registers(temp1, temp2, temp3, temp4, member_reg);
319
320 if (iid == vmIntrinsics::_invokeBasic) {
321 // indirect through MH.form.vmentry.vmtarget
322 jump_to_lambda_form(_masm, receiver_reg, G5_method, temp1, temp2, for_compiler_entry);
323
324 } else {
325 // The method is a member invoker used by direct method handles.
326 if (VerifyMethodHandles) {
327 // make sure the trailing argument really is a MemberName (caller responsibility)
328 verify_klass(_masm, member_reg, SystemDictionary::WK_KLASS_ENUM_NAME(MemberName_klass),
329 temp1, temp2,
330 "MemberName required for invokeVirtual etc.");
331 }
332
333 Address member_clazz( member_reg, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes()));
334 Address member_vmindex( member_reg, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes()));
335 Address member_vmtarget( member_reg, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes()));
336
337 Register temp1_recv_klass = temp1;
338 if (iid != vmIntrinsics::_linkToStatic) {
339 __ verify_oop(receiver_reg);
340 if (iid == vmIntrinsics::_linkToSpecial) {
341 // Don't actually load the klass; just null-check the receiver.
342 __ null_check(receiver_reg);
343 } else {
344 // load receiver klass itself
345 __ null_check(receiver_reg, oopDesc::klass_offset_in_bytes());
346 __ load_klass(receiver_reg, temp1_recv_klass);
347 __ verify_klass_ptr(temp1_recv_klass);
348 }
349 BLOCK_COMMENT("check_receiver {");
350 // The receiver for the MemberName must be in receiver_reg.
351 // Check the receiver against the MemberName.clazz
352 if (VerifyMethodHandles && iid == vmIntrinsics::_linkToSpecial) {
353 // Did not load it above...
354 __ load_klass(receiver_reg, temp1_recv_klass);
355 __ verify_klass_ptr(temp1_recv_klass);
356 }
357 if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) {
358 Label L_ok;
359 Register temp2_defc = temp2;
360 __ load_heap_oop(member_clazz, temp2_defc);
361 load_klass_from_Class(_masm, temp2_defc, temp3, temp4);
362 __ verify_klass_ptr(temp2_defc);
363 __ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, temp4, L_ok);
364 // If we get here, the type check failed!
365 __ STOP("receiver class disagrees with MemberName.clazz");
366 __ bind(L_ok);
367 }
368 BLOCK_COMMENT("} check_receiver");
369 }
370 if (iid == vmIntrinsics::_linkToSpecial ||
371 iid == vmIntrinsics::_linkToStatic) {
372 DEBUG_ONLY(temp1_recv_klass = noreg); // these guys didn't load the recv_klass
373 }
374
375 // Live registers at this point:
376 // member_reg - MemberName that was the trailing argument
377 // temp1_recv_klass - klass of stacked receiver, if needed
378 // O5_savedSP - interpreter linkage (if interpreted)
379 // O0..O5 - compiler arguments (if compiled)
380
381 Label L_incompatible_class_change_error;
382 switch (iid) {
383 case vmIntrinsics::_linkToSpecial:
384 if (VerifyMethodHandles) {
385 verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp2);
386 }
387 __ ld_ptr(member_vmtarget, G5_method);
388 break;
389
390 case vmIntrinsics::_linkToStatic:
391 if (VerifyMethodHandles) {
392 verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp2);
393 }
394 __ ld_ptr(member_vmtarget, G5_method);
395 break;
396
397 case vmIntrinsics::_linkToVirtual:
398 {
399 // same as TemplateTable::invokevirtual,
400 // minus the CP setup and profiling:
401
402 if (VerifyMethodHandles) {
403 verify_ref_kind(_masm, JVM_REF_invokeVirtual, member_reg, temp2);
404 }
405
406 // pick out the vtable index from the MemberName, and then we can discard it:
407 Register temp2_index = temp2;
408 __ ld_ptr(member_vmindex, temp2_index);
409
410 if (VerifyMethodHandles) {
411 Label L_index_ok;
412 __ cmp_and_br_short(temp2_index, (int) 0, Assembler::greaterEqual, Assembler::pn, L_index_ok);
413 __ STOP("no virtual index");
414 __ BIND(L_index_ok);
415 }
416
417 // Note: The verifier invariants allow us to ignore MemberName.clazz and vmtarget
418 // at this point. And VerifyMethodHandles has already checked clazz, if needed.
419
420 // get target Method* & entry point
421 __ lookup_virtual_method(temp1_recv_klass, temp2_index, G5_method);
422 break;
423 }
424
425 case vmIntrinsics::_linkToInterface:
426 {
427 // same as TemplateTable::invokeinterface
428 // (minus the CP setup and profiling, with different argument motion)
429 if (VerifyMethodHandles) {
430 verify_ref_kind(_masm, JVM_REF_invokeInterface, member_reg, temp2);
431 }
432
433 Register temp2_intf = temp2;
434 __ load_heap_oop(member_clazz, temp2_intf);
435 load_klass_from_Class(_masm, temp2_intf, temp3, temp4);
436 __ verify_klass_ptr(temp2_intf);
437
438 Register G5_index = G5_method;
439 __ ld_ptr(member_vmindex, G5_index);
440 if (VerifyMethodHandles) {
441 Label L;
442 __ cmp_and_br_short(G5_index, 0, Assembler::greaterEqual, Assembler::pt, L);
443 __ STOP("invalid vtable index for MH.invokeInterface");
444 __ bind(L);
445 }
446
447 // given intf, index, and recv klass, dispatch to the implementation method
448 __ lookup_interface_method(temp1_recv_klass, temp2_intf,
449 // note: next two args must be the same:
450 G5_index, G5_method,
451 temp3, temp4,
452 L_incompatible_class_change_error);
453 break;
454 }
455
456 default:
457 fatal("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid));
458 break;
459 }
460
461 // Live at this point:
462 // G5_method
463 // O5_savedSP (if interpreted)
464
465 // After figuring out which concrete method to call, jump into it.
466 // Note that this works in the interpreter with no data motion.
467 // But the compiled version will require that rcx_recv be shifted out.
468 __ verify_method_ptr(G5_method);
469 jump_from_method_handle(_masm, G5_method, temp1, temp2, for_compiler_entry);
470
471 if (iid == vmIntrinsics::_linkToInterface) {
472 __ BIND(L_incompatible_class_change_error);
473 AddressLiteral icce(StubRoutines::throw_IncompatibleClassChangeError_entry());
474 __ jump_to(icce, temp1);
475 __ delayed()->nop();
476 }
477 }
478 }
479
480 #ifndef PRODUCT
481 void trace_method_handle_stub(const char* adaptername,
482 oopDesc* mh,
483 intptr_t* saved_sp,
484 intptr_t* args,
485 intptr_t* tracing_fp) {
486 bool has_mh = (strstr(adaptername, "/static") == NULL &&
487 strstr(adaptername, "linkTo") == NULL); // static linkers don't have MH
488 const char* mh_reg_name = has_mh ? "G3_mh" : "G3";
489 tty->print_cr("MH %s %s=" INTPTR_FORMAT " saved_sp=" INTPTR_FORMAT " args=" INTPTR_FORMAT,
490 adaptername, mh_reg_name,
491 p2i(mh), p2i(saved_sp), p2i(args));
492
493 if (Verbose) {
494 // dumping last frame with frame::describe
495
496 JavaThread* p = JavaThread::active();
497
498 ResourceMark rm;
499 PRESERVE_EXCEPTION_MARK; // may not be needed by safer and unexpensive here
500 FrameValues values;
501
502 // Note: We want to allow trace_method_handle from any call site.
503 // While trace_method_handle creates a frame, it may be entered
504 // without a valid return PC in O7 (e.g. not just after a call).
505 // Walking that frame could lead to failures due to that invalid PC.
506 // => carefully detect that frame when doing the stack walking
507
508 // walk up to the right frame using the "tracing_fp" argument
509 intptr_t* cur_sp = StubRoutines::Sparc::flush_callers_register_windows_func()();
510 frame cur_frame(cur_sp, frame::unpatchable, NULL);
511
512 while (cur_frame.fp() != (intptr_t *)(STACK_BIAS+(uintptr_t)tracing_fp)) {
513 cur_frame = os::get_sender_for_C_frame(&cur_frame);
514 }
515
516 // safely create a frame and call frame::describe
517 intptr_t *dump_sp = cur_frame.sender_sp();
518 intptr_t *dump_fp = cur_frame.link();
519
520 bool walkable = has_mh; // whether the traced frame shoud be walkable
521
522 // the sender for cur_frame is the caller of trace_method_handle
523 if (walkable) {
524 // The previous definition of walkable may have to be refined
525 // if new call sites cause the next frame constructor to start
526 // failing. Alternatively, frame constructors could be
527 // modified to support the current or future non walkable
528 // frames (but this is more intrusive and is not considered as
529 // part of this RFE, which will instead use a simpler output).
530 frame dump_frame = frame(dump_sp,
531 cur_frame.sp(), // younger_sp
532 false); // no adaptation
533 dump_frame.describe(values, 1);
534 } else {
535 // Robust dump for frames which cannot be constructed from sp/younger_sp
536 // Add descriptions without building a Java frame to avoid issues
537 values.describe(-1, dump_fp, "fp for #1 <not parsed, cannot trust pc>");
538 values.describe(-1, dump_sp, "sp");
539 }
540
541 bool has_args = has_mh; // whether Gargs is meaningful
542
543 // mark args, if seems valid (may not be valid for some adapters)
544 if (has_args) {
545 if ((args >= dump_sp) && (args < dump_fp)) {
546 values.describe(-1, args, "*G4_args");
547 }
548 }
549
550 // mark saved_sp, if seems valid (may not be valid for some adapters)
551 intptr_t *unbiased_sp = (intptr_t *)(STACK_BIAS+(uintptr_t)saved_sp);
552 const int ARG_LIMIT = 255, SLOP = 45, UNREASONABLE_STACK_MOVE = (ARG_LIMIT + SLOP);
553 if ((unbiased_sp >= dump_sp - UNREASONABLE_STACK_MOVE) && (unbiased_sp < dump_fp)) {
554 values.describe(-1, unbiased_sp, "*saved_sp+STACK_BIAS");
555 }
556
557 // Note: the unextended_sp may not be correct
558 tty->print_cr(" stack layout:");
559 values.print(p);
560 if (has_mh && mh->is_oop()) {
561 mh->print();
562 if (java_lang_invoke_MethodHandle::is_instance(mh)) {
563 if (java_lang_invoke_MethodHandle::form_offset_in_bytes() != 0)
564 java_lang_invoke_MethodHandle::form(mh)->print();
565 }
566 }
567 }
568 }
569
570 void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) {
571 if (!TraceMethodHandles) return;
572 BLOCK_COMMENT("trace_method_handle {");
573 // save: Gargs, O5_savedSP
574 __ save_frame(16); // need space for saving required FPU state
575
576 __ set((intptr_t) adaptername, O0);
577 __ mov(G3_method_handle, O1);
578 __ mov(I5_savedSP, O2);
579 __ mov(Gargs, O3);
580 __ mov(I6, O4); // frame identifier for safe stack walking
581
582 // Save scratched registers that might be needed. Robustness is more
583 // important than optimizing the saves for this debug only code.
584
585 // save FP result, valid at some call sites (adapter_opt_return_float, ...)
586 Address d_save(FP, -sizeof(jdouble) + STACK_BIAS);
587 __ stf(FloatRegisterImpl::D, Ftos_d, d_save);
588 // Safely save all globals but G2 (handled by call_VM_leaf) and G7
589 // (OS reserved).
590 __ mov(G3_method_handle, L3);
591 __ mov(Gargs, L4);
592 __ mov(G5_method_type, L5);
593 __ mov(G6, L6);
594 __ mov(G1, L1);
595
596 __ call_VM_leaf(L2 /* for G2 */, CAST_FROM_FN_PTR(address, trace_method_handle_stub));
597
598 __ mov(L3, G3_method_handle);
599 __ mov(L4, Gargs);
600 __ mov(L5, G5_method_type);
601 __ mov(L6, G6);
602 __ mov(L1, G1);
603 __ ldf(FloatRegisterImpl::D, d_save, Ftos_d);
604
605 __ restore();
606 BLOCK_COMMENT("} trace_method_handle");
607 }
608 #endif // PRODUCT