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 "jvm.h"
27 #include "asm/macroAssembler.hpp"
28 #include "classfile/javaClasses.inline.hpp"
29 #include "interpreter/interpreter.hpp"
30 #include "interpreter/interp_masm.hpp"
31 #include "memory/allocation.inline.hpp"
32 #include "memory/resourceArea.hpp"
33 #include "prims/methodHandles.hpp"
34 #include "utilities/preserveException.hpp"
35
36 #define __ _masm->
37
38 #ifdef PRODUCT
39 #define BLOCK_COMMENT(str) /* nothing */
40 #define STOP(error) stop(error)
41 #else
42 #define BLOCK_COMMENT(str) __ block_comment(str)
43 #define STOP(error) block_comment(error); __ stop(error)
44 #endif
45
46 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":")
47
48 // Workaround for C++ overloading nastiness on '0' for RegisterOrConstant.
49 static RegisterOrConstant constant(int value) {
50 return RegisterOrConstant(value);
51 }
52
53 void MethodHandles::load_klass_from_Class(MacroAssembler* _masm, Register klass_reg, Register temp_reg, Register temp2_reg) {
54 if (VerifyMethodHandles)
55 verify_klass(_masm, klass_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_Class), temp_reg, temp2_reg,
56 "MH argument is a Class");
57 __ ld_ptr(Address(klass_reg, java_lang_Class::klass_offset_in_bytes()), klass_reg);
58 }
59
60 #ifdef ASSERT
61 static int check_nonzero(const char* xname, int x) {
62 assert(x != 0, "%s should be nonzero", xname);
63 return x;
64 }
65 #define NONZERO(x) check_nonzero(#x, x)
66 #else //ASSERT
67 #define NONZERO(x) (x)
68 #endif //ASSERT
69
70 #ifdef ASSERT
71 void MethodHandles::verify_klass(MacroAssembler* _masm,
72 Register obj_reg, SystemDictionary::WKID klass_id,
73 Register temp_reg, Register temp2_reg,
74 const char* error_message) {
75 InstanceKlass** klass_addr = SystemDictionary::well_known_klass_addr(klass_id);
76 Klass* klass = SystemDictionary::well_known_klass(klass_id);
77 bool did_save = false;
78 if (temp_reg == noreg || temp2_reg == noreg) {
79 temp_reg = L1;
80 temp2_reg = L2;
81 __ save_frame_and_mov(0, obj_reg, L0);
82 obj_reg = L0;
83 did_save = true;
84 }
85 Label L_ok, L_bad;
86 BLOCK_COMMENT("verify_klass {");
87 __ verify_oop(obj_reg);
88 __ br_null_short(obj_reg, Assembler::pn, L_bad);
89 __ load_klass(obj_reg, temp_reg);
90 __ set(ExternalAddress((Metadata**)klass_addr), temp2_reg);
91 __ ld_ptr(Address(temp2_reg, 0), temp2_reg);
92 __ cmp_and_brx_short(temp_reg, temp2_reg, Assembler::equal, Assembler::pt, L_ok);
93 intptr_t super_check_offset = klass->super_check_offset();
94 __ ld_ptr(Address(temp_reg, super_check_offset), temp_reg);
95 __ set(ExternalAddress((Metadata**)klass_addr), temp2_reg);
96 __ ld_ptr(Address(temp2_reg, 0), temp2_reg);
97 __ cmp_and_brx_short(temp_reg, temp2_reg, Assembler::equal, Assembler::pt, L_ok);
98 __ BIND(L_bad);
99 if (did_save) __ restore();
100 __ STOP(error_message);
101 __ BIND(L_ok);
102 if (did_save) __ restore();
103 BLOCK_COMMENT("} verify_klass");
104 }
105
106 void MethodHandles::verify_ref_kind(MacroAssembler* _masm, int ref_kind, Register member_reg, Register temp) {
107 Label L;
108 BLOCK_COMMENT("verify_ref_kind {");
109 __ lduw(Address(member_reg, NONZERO(java_lang_invoke_MemberName::flags_offset_in_bytes())), temp);
110 __ srl( temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT, temp);
111 __ and3(temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK, temp);
112 __ cmp_and_br_short(temp, ref_kind, Assembler::equal, Assembler::pt, L);
113 { char* buf = NEW_C_HEAP_ARRAY(char, 100, mtInternal);
114 jio_snprintf(buf, 100, "verify_ref_kind expected %x", ref_kind);
115 if (ref_kind == JVM_REF_invokeVirtual ||
116 ref_kind == JVM_REF_invokeSpecial)
117 // could do this for all ref_kinds, but would explode assembly code size
118 trace_method_handle(_masm, buf);
119 __ STOP(buf);
120 }
121 BLOCK_COMMENT("} verify_ref_kind");
122 __ bind(L);
123 }
124
125 #endif // ASSERT
126
127 void MethodHandles::jump_from_method_handle(MacroAssembler* _masm, Register method, Register target, Register temp,
128 bool for_compiler_entry) {
129 Label L_no_such_method;
130 assert(method == G5_method, "interpreter calling convention");
131 assert_different_registers(method, target, temp);
132
133 if (!for_compiler_entry && JvmtiExport::can_post_interpreter_events()) {
134 Label run_compiled_code;
135 // JVMTI events, such as single-stepping, are implemented partly by avoiding running
136 // compiled code in threads for which the event is enabled. Check here for
137 // interp_only_mode if these events CAN be enabled.
138 __ verify_thread();
139 const Address interp_only(G2_thread, JavaThread::interp_only_mode_offset());
140 __ ld(interp_only, temp);
141 __ cmp_and_br_short(temp, 0, Assembler::zero, Assembler::pt, run_compiled_code);
142 // Null method test is replicated below in compiled case,
143 // it might be able to address across the verify_thread()
144 __ br_null_short(G5_method, Assembler::pn, L_no_such_method);
145 __ ld_ptr(G5_method, in_bytes(Method::interpreter_entry_offset()), target);
146 __ jmp(target, 0);
147 __ delayed()->nop();
148 __ BIND(run_compiled_code);
149 // Note: we could fill some delay slots here, but
150 // it doesn't matter, since this is interpreter code.
151 }
152
153 // Compiled case, either static or fall-through from runtime conditional
154 __ br_null_short(G5_method, Assembler::pn, L_no_such_method);
155
156 const ByteSize entry_offset = for_compiler_entry ? Method::from_compiled_offset() :
157 Method::from_interpreted_offset();
158 __ ld_ptr(G5_method, in_bytes(entry_offset), target);
159 __ jmp(target, 0);
160 __ delayed()->nop();
161
162 __ bind(L_no_such_method);
163 AddressLiteral ame(StubRoutines::throw_AbstractMethodError_entry());
164 __ jump_to(ame, temp);
165 __ delayed()->nop();
166 }
167
168 void MethodHandles::jump_to_lambda_form(MacroAssembler* _masm,
169 Register recv, Register method_temp,
170 Register temp2, Register temp3,
171 bool for_compiler_entry) {
172 BLOCK_COMMENT("jump_to_lambda_form {");
173 // This is the initial entry point of a lazy method handle.
174 // After type checking, it picks up the invoker from the LambdaForm.
175 assert_different_registers(recv, method_temp, temp2); // temp3 is only passed on
176 assert(method_temp == G5_method, "required register for loading method");
177
178 //NOT_PRODUCT({ FlagSetting fs(TraceMethodHandles, true); trace_method_handle(_masm, "LZMH"); });
179
180 // Load the invoker, as MH -> MH.form -> LF.vmentry
181 __ verify_oop(recv);
182 __ load_heap_oop(Address(recv, NONZERO(java_lang_invoke_MethodHandle::form_offset_in_bytes())), method_temp);
183 __ verify_oop(method_temp);
184 __ load_heap_oop(Address(method_temp, NONZERO(java_lang_invoke_LambdaForm::vmentry_offset_in_bytes())), method_temp);
185 __ verify_oop(method_temp);
186 __ load_heap_oop(Address(method_temp, NONZERO(java_lang_invoke_MemberName::method_offset_in_bytes())), method_temp);
187 __ verify_oop(method_temp);
188 __ ld_ptr( Address(method_temp, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset_in_bytes())), method_temp);
189
190 if (VerifyMethodHandles && !for_compiler_entry) {
191 // make sure recv is already on stack
192 __ ld_ptr(method_temp, in_bytes(Method::const_offset()), temp2);
193 __ load_sized_value(Address(temp2, ConstMethod::size_of_parameters_offset()),
194 temp2,
195 sizeof(u2), /*is_signed*/ false);
196 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), "");
197 Label L;
198 __ ld_ptr(__ argument_address(temp2, temp2, -1), temp2);
199 __ cmp_and_br_short(temp2, recv, Assembler::equal, Assembler::pt, L);
200 __ STOP("receiver not on stack");
201 __ BIND(L);
202 }
203
204 jump_from_method_handle(_masm, method_temp, temp2, temp3, for_compiler_entry);
205 BLOCK_COMMENT("} jump_to_lambda_form");
206 }
207
208
209 // Code generation
210 address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm,
211 vmIntrinsics::ID iid) {
212 const bool not_for_compiler_entry = false; // this is the interpreter entry
213 assert(is_signature_polymorphic(iid), "expected invoke iid");
214 if (iid == vmIntrinsics::_invokeGeneric ||
215 iid == vmIntrinsics::_compiledLambdaForm) {
216 // Perhaps surprisingly, the symbolic references visible to Java are not directly used.
217 // They are linked to Java-generated adapters via MethodHandleNatives.linkMethod.
218 // They all allow an appendix argument.
219 __ should_not_reach_here(); // empty stubs make SG sick
220 return NULL;
221 }
222
223 // I5_savedSP/O5_savedSP: sender SP (must preserve; see prepare_to_jump_from_interpreted)
224 // G5_method: Method*
225 // G4 (Gargs): incoming argument list (must preserve)
226 // O0: used as temp to hold mh or receiver
227 // O1, O4: garbage temps, blown away
228 Register O1_scratch = O1;
229 Register O4_param_size = O4; // size of parameters
230
231 // here's where control starts out:
232 __ align(CodeEntryAlignment);
233 address entry_point = __ pc();
234
235 if (VerifyMethodHandles) {
236 assert(Method::intrinsic_id_size_in_bytes() == 2, "assuming Method::_intrinsic_id is u2");
237
238 Label L;
239 BLOCK_COMMENT("verify_intrinsic_id {");
240 __ lduh(Address(G5_method, Method::intrinsic_id_offset_in_bytes()), O1_scratch);
241 __ cmp_and_br_short(O1_scratch, (int) iid, Assembler::equal, Assembler::pt, L);
242 if (iid == vmIntrinsics::_linkToVirtual ||
243 iid == vmIntrinsics::_linkToSpecial) {
244 // could do this for all kinds, but would explode assembly code size
245 trace_method_handle(_masm, "bad Method*::intrinsic_id");
246 }
247 __ STOP("bad Method*::intrinsic_id");
248 __ bind(L);
249 BLOCK_COMMENT("} verify_intrinsic_id");
250 }
251
252 // First task: Find out how big the argument list is.
253 Address O4_first_arg_addr;
254 int ref_kind = signature_polymorphic_intrinsic_ref_kind(iid);
255 assert(ref_kind != 0 || iid == vmIntrinsics::_invokeBasic, "must be _invokeBasic or a linkTo intrinsic");
256 if (ref_kind == 0 || MethodHandles::ref_kind_has_receiver(ref_kind)) {
257 __ ld_ptr(G5_method, in_bytes(Method::const_offset()), O4_param_size);
258 __ load_sized_value(Address(O4_param_size, ConstMethod::size_of_parameters_offset()),
259 O4_param_size,
260 sizeof(u2), /*is_signed*/ false);
261 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), "");
262 O4_first_arg_addr = __ argument_address(O4_param_size, O4_param_size, -1);
263 } else {
264 DEBUG_ONLY(O4_param_size = noreg);
265 }
266
267 Register O0_mh = noreg;
268 if (!is_signature_polymorphic_static(iid)) {
269 __ ld_ptr(O4_first_arg_addr, O0_mh = O0);
270 DEBUG_ONLY(O4_param_size = noreg);
271 }
272
273 // O4_first_arg_addr is live!
274
275 if (TraceMethodHandles) {
276 if (O0_mh != noreg)
277 __ mov(O0_mh, G3_method_handle); // make stub happy
278 trace_method_handle_interpreter_entry(_masm, iid);
279 }
280
281 if (iid == vmIntrinsics::_invokeBasic) {
282 generate_method_handle_dispatch(_masm, iid, O0_mh, noreg, not_for_compiler_entry);
283
284 } else {
285 // Adjust argument list by popping the trailing MemberName argument.
286 Register O0_recv = noreg;
287 if (MethodHandles::ref_kind_has_receiver(ref_kind)) {
288 // Load the receiver (not the MH; the actual MemberName's receiver) up from the interpreter stack.
289 __ ld_ptr(O4_first_arg_addr, O0_recv = O0);
290 DEBUG_ONLY(O4_param_size = noreg);
291 }
292 Register G5_member = G5_method; // MemberName ptr; incoming method ptr is dead now
293 __ ld_ptr(__ argument_address(constant(0)), G5_member);
294 __ add(Gargs, Interpreter::stackElementSize, Gargs);
295 generate_method_handle_dispatch(_masm, iid, O0_recv, G5_member, not_for_compiler_entry);
296 }
297
298 return entry_point;
299 }
300
301 void MethodHandles::generate_method_handle_dispatch(MacroAssembler* _masm,
302 vmIntrinsics::ID iid,
303 Register receiver_reg,
304 Register member_reg,
305 bool for_compiler_entry) {
306 assert(is_signature_polymorphic(iid), "expected invoke iid");
307 Register temp1 = (for_compiler_entry ? G1_scratch : O1);
308 Register temp2 = (for_compiler_entry ? G3_scratch : O2);
309 Register temp3 = (for_compiler_entry ? G4_scratch : O3);
310 Register temp4 = (for_compiler_entry ? noreg : O4);
311 if (for_compiler_entry) {
312 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : O0), "only valid assignment");
313 assert_different_registers(temp1, O0, O1, O2, O3, O4, O5);
314 assert_different_registers(temp2, O0, O1, O2, O3, O4, O5);
315 assert_different_registers(temp3, O0, O1, O2, O3, O4, O5);
316 assert_different_registers(temp4, O0, O1, O2, O3, O4, O5);
317 } else {
318 assert_different_registers(temp1, temp2, temp3, temp4, O5_savedSP); // don't trash lastSP
319 }
320 if (receiver_reg != noreg) assert_different_registers(temp1, temp2, temp3, temp4, receiver_reg);
321 if (member_reg != noreg) assert_different_registers(temp1, temp2, temp3, temp4, member_reg);
322
323 if (iid == vmIntrinsics::_invokeBasic) {
324 // indirect through MH.form.vmentry.vmtarget
325 jump_to_lambda_form(_masm, receiver_reg, G5_method, temp1, temp2, for_compiler_entry);
326
327 } else {
328 // The method is a member invoker used by direct method handles.
329 if (VerifyMethodHandles) {
330 // make sure the trailing argument really is a MemberName (caller responsibility)
331 verify_klass(_masm, member_reg, SystemDictionary::WK_KLASS_ENUM_NAME(MemberName_klass),
332 temp1, temp2,
333 "MemberName required for invokeVirtual etc.");
334 }
335
336 Address member_clazz( member_reg, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes()));
337 Address member_vmindex( member_reg, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes()));
338 Address member_vmtarget( member_reg, NONZERO(java_lang_invoke_MemberName::method_offset_in_bytes()));
339 Address vmtarget_method( G5_method, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset_in_bytes()));
340
341 Register temp1_recv_klass = temp1;
342 if (iid != vmIntrinsics::_linkToStatic) {
343 __ verify_oop(receiver_reg);
344 if (iid == vmIntrinsics::_linkToSpecial) {
345 // Don't actually load the klass; just null-check the receiver.
346 __ null_check(receiver_reg);
347 } else {
348 // load receiver klass itself
349 __ null_check(receiver_reg, oopDesc::klass_offset_in_bytes());
350 __ load_klass(receiver_reg, temp1_recv_klass);
351 __ verify_klass_ptr(temp1_recv_klass);
352 }
353 BLOCK_COMMENT("check_receiver {");
354 // The receiver for the MemberName must be in receiver_reg.
355 // Check the receiver against the MemberName.clazz
356 if (VerifyMethodHandles && iid == vmIntrinsics::_linkToSpecial) {
357 // Did not load it above...
358 __ load_klass(receiver_reg, temp1_recv_klass);
359 __ verify_klass_ptr(temp1_recv_klass);
360 }
361 if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) {
362 Label L_ok;
363 Register temp2_defc = temp2;
364 __ load_heap_oop(member_clazz, temp2_defc);
365 load_klass_from_Class(_masm, temp2_defc, temp3, temp4);
366 __ verify_klass_ptr(temp2_defc);
367 __ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, temp4, L_ok);
368 // If we get here, the type check failed!
369 __ STOP("receiver class disagrees with MemberName.clazz");
370 __ bind(L_ok);
371 }
372 BLOCK_COMMENT("} check_receiver");
373 }
374 if (iid == vmIntrinsics::_linkToSpecial ||
375 iid == vmIntrinsics::_linkToStatic) {
376 DEBUG_ONLY(temp1_recv_klass = noreg); // these guys didn't load the recv_klass
377 }
378
379 // Live registers at this point:
380 // member_reg - MemberName that was the trailing argument
381 // temp1_recv_klass - klass of stacked receiver, if needed
382 // O5_savedSP - interpreter linkage (if interpreted)
383 // O0..O5 - compiler arguments (if compiled)
384
385 Label L_incompatible_class_change_error;
386 switch (iid) {
387 case vmIntrinsics::_linkToSpecial:
388 if (VerifyMethodHandles) {
389 verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp2);
390 }
391 __ load_heap_oop(member_vmtarget, G5_method);
392 __ ld_ptr(vmtarget_method, G5_method);
393 break;
394
395 case vmIntrinsics::_linkToStatic:
396 if (VerifyMethodHandles) {
397 verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp2);
398 }
399 __ load_heap_oop(member_vmtarget, G5_method);
400 __ ld_ptr(vmtarget_method, G5_method);
401 break;
402
403 case vmIntrinsics::_linkToVirtual:
404 {
405 // same as TemplateTable::invokevirtual,
406 // minus the CP setup and profiling:
407
408 if (VerifyMethodHandles) {
409 verify_ref_kind(_masm, JVM_REF_invokeVirtual, member_reg, temp2);
410 }
411
412 // pick out the vtable index from the MemberName, and then we can discard it:
413 Register temp2_index = temp2;
414 __ ld_ptr(member_vmindex, temp2_index);
415
416 if (VerifyMethodHandles) {
417 Label L_index_ok;
418 __ cmp_and_br_short(temp2_index, (int) 0, Assembler::greaterEqual, Assembler::pn, L_index_ok);
419 __ STOP("no virtual index");
420 __ BIND(L_index_ok);
421 }
422
423 // Note: The verifier invariants allow us to ignore MemberName.clazz and vmtarget
424 // at this point. And VerifyMethodHandles has already checked clazz, if needed.
425
426 // get target Method* & entry point
427 __ lookup_virtual_method(temp1_recv_klass, temp2_index, G5_method);
428 break;
429 }
430
431 case vmIntrinsics::_linkToInterface:
432 {
433 // same as TemplateTable::invokeinterface
434 // (minus the CP setup and profiling, with different argument motion)
435 if (VerifyMethodHandles) {
436 verify_ref_kind(_masm, JVM_REF_invokeInterface, member_reg, temp2);
437 }
438
439 Register temp2_intf = temp2;
440 __ load_heap_oop(member_clazz, temp2_intf);
441 load_klass_from_Class(_masm, temp2_intf, temp3, temp4);
442 __ verify_klass_ptr(temp2_intf);
443
444 Register G5_index = G5_method;
445 __ ld_ptr(member_vmindex, G5_index);
446 if (VerifyMethodHandles) {
447 Label L;
448 __ cmp_and_br_short(G5_index, 0, Assembler::greaterEqual, Assembler::pt, L);
449 __ STOP("invalid vtable index for MH.invokeInterface");
450 __ bind(L);
451 }
452
453 // given intf, index, and recv klass, dispatch to the implementation method
454 __ lookup_interface_method(temp1_recv_klass, temp2_intf,
455 // note: next two args must be the same:
456 G5_index, G5_method,
457 temp3, temp4,
458 L_incompatible_class_change_error);
459 break;
460 }
461
462 default:
463 fatal("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid));
464 break;
465 }
466
467 // Live at this point:
468 // G5_method
469 // O5_savedSP (if interpreted)
470
471 // After figuring out which concrete method to call, jump into it.
472 // Note that this works in the interpreter with no data motion.
473 // But the compiled version will require that rcx_recv be shifted out.
474 __ verify_method_ptr(G5_method);
475 jump_from_method_handle(_masm, G5_method, temp1, temp2, for_compiler_entry);
476
477 if (iid == vmIntrinsics::_linkToInterface) {
478 __ BIND(L_incompatible_class_change_error);
479 AddressLiteral icce(StubRoutines::throw_IncompatibleClassChangeError_entry());
480 __ jump_to(icce, temp1);
481 __ delayed()->nop();
482 }
483 }
484 }
485
486 #ifndef PRODUCT
487 void trace_method_handle_stub(const char* adaptername,
488 oopDesc* mh,
489 intptr_t* saved_sp,
490 intptr_t* args,
491 intptr_t* tracing_fp) {
492 bool has_mh = (strstr(adaptername, "/static") == NULL &&
493 strstr(adaptername, "linkTo") == NULL); // static linkers don't have MH
494 const char* mh_reg_name = has_mh ? "G3_mh" : "G3";
495 tty->print_cr("MH %s %s=" INTPTR_FORMAT " saved_sp=" INTPTR_FORMAT " args=" INTPTR_FORMAT,
496 adaptername, mh_reg_name,
497 p2i(mh), p2i(saved_sp), p2i(args));
498
499 if (Verbose) {
500 // dumping last frame with frame::describe
501
502 JavaThread* p = JavaThread::active();
503
504 ResourceMark rm;
505 PRESERVE_EXCEPTION_MARK; // may not be needed by safer and unexpensive here
506 FrameValues values;
507
508 // Note: We want to allow trace_method_handle from any call site.
509 // While trace_method_handle creates a frame, it may be entered
510 // without a valid return PC in O7 (e.g. not just after a call).
511 // Walking that frame could lead to failures due to that invalid PC.
512 // => carefully detect that frame when doing the stack walking
513
514 // walk up to the right frame using the "tracing_fp" argument
515 intptr_t* cur_sp = StubRoutines::Sparc::flush_callers_register_windows_func()();
516 frame cur_frame(cur_sp, frame::unpatchable, NULL);
517
518 while (cur_frame.fp() != (intptr_t *)(STACK_BIAS+(uintptr_t)tracing_fp)) {
519 cur_frame = os::get_sender_for_C_frame(&cur_frame);
520 }
521
522 // safely create a frame and call frame::describe
523 intptr_t *dump_sp = cur_frame.sender_sp();
524 intptr_t *dump_fp = cur_frame.link();
525
526 bool walkable = has_mh; // whether the traced frame shoud be walkable
527
528 // the sender for cur_frame is the caller of trace_method_handle
529 if (walkable) {
530 // The previous definition of walkable may have to be refined
531 // if new call sites cause the next frame constructor to start
532 // failing. Alternatively, frame constructors could be
533 // modified to support the current or future non walkable
534 // frames (but this is more intrusive and is not considered as
535 // part of this RFE, which will instead use a simpler output).
536 frame dump_frame = frame(dump_sp,
537 cur_frame.sp(), // younger_sp
538 false); // no adaptation
539 dump_frame.describe(values, 1);
540 } else {
541 // Robust dump for frames which cannot be constructed from sp/younger_sp
542 // Add descriptions without building a Java frame to avoid issues
543 values.describe(-1, dump_fp, "fp for #1 <not parsed, cannot trust pc>");
544 values.describe(-1, dump_sp, "sp");
545 }
546
547 bool has_args = has_mh; // whether Gargs is meaningful
548
549 // mark args, if seems valid (may not be valid for some adapters)
550 if (has_args) {
551 if ((args >= dump_sp) && (args < dump_fp)) {
552 values.describe(-1, args, "*G4_args");
553 }
554 }
555
556 // mark saved_sp, if seems valid (may not be valid for some adapters)
557 intptr_t *unbiased_sp = (intptr_t *)(STACK_BIAS+(uintptr_t)saved_sp);
558 const int ARG_LIMIT = 255, SLOP = 45, UNREASONABLE_STACK_MOVE = (ARG_LIMIT + SLOP);
559 if ((unbiased_sp >= dump_sp - UNREASONABLE_STACK_MOVE) && (unbiased_sp < dump_fp)) {
560 values.describe(-1, unbiased_sp, "*saved_sp+STACK_BIAS");
561 }
562
563 // Note: the unextended_sp may not be correct
564 tty->print_cr(" stack layout:");
565 values.print(p);
566 if (has_mh && oopDesc::is_oop(mh)) {
567 mh->print();
568 if (java_lang_invoke_MethodHandle::is_instance(mh)) {
569 if (java_lang_invoke_MethodHandle::form_offset_in_bytes() != 0)
570 java_lang_invoke_MethodHandle::form(mh)->print();
571 }
572 }
573 }
574 }
575
576 void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) {
577 if (!TraceMethodHandles) return;
578 BLOCK_COMMENT("trace_method_handle {");
579 // save: Gargs, O5_savedSP
580 __ save_frame(16); // need space for saving required FPU state
581
582 __ set((intptr_t) adaptername, O0);
583 __ mov(G3_method_handle, O1);
584 __ mov(I5_savedSP, O2);
585 __ mov(Gargs, O3);
586 __ mov(I6, O4); // frame identifier for safe stack walking
587
588 // Save scratched registers that might be needed. Robustness is more
589 // important than optimizing the saves for this debug only code.
590
591 // save FP result, valid at some call sites (adapter_opt_return_float, ...)
592 Address d_save(FP, -sizeof(jdouble) + STACK_BIAS);
593 __ stf(FloatRegisterImpl::D, Ftos_d, d_save);
594 // Safely save all globals but G2 (handled by call_VM_leaf) and G7
595 // (OS reserved).
596 __ mov(G3_method_handle, L3);
597 __ mov(Gargs, L4);
598 __ mov(G5_method_type, L5);
599 __ mov(G6, L6);
600 __ mov(G1, L1);
601
602 __ call_VM_leaf(L2 /* for G2 */, CAST_FROM_FN_PTR(address, trace_method_handle_stub));
603
604 __ mov(L3, G3_method_handle);
605 __ mov(L4, Gargs);
606 __ mov(L5, G5_method_type);
607 __ mov(L6, G6);
608 __ mov(L1, G1);
609 __ ldf(FloatRegisterImpl::D, d_save, Ftos_d);
610
611 __ restore();
612 BLOCK_COMMENT("} trace_method_handle");
613 }
614 #endif // PRODUCT