1 /*
2 * Copyright (c) 2008, 2018, 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 "runtime/frame.inline.hpp"
35 #include "utilities/preserveException.hpp"
36
37 #define __ _masm->
38
39 #ifdef PRODUCT
40 #define BLOCK_COMMENT(str) /* nothing */
41 #define STOP(error) stop(error)
42 #else
43 #define BLOCK_COMMENT(str) __ block_comment(str)
44 #define STOP(error) block_comment(error); __ stop(error)
45 #endif
46
47 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":")
48
49 // Workaround for C++ overloading nastiness on '0' for RegisterOrConstant.
50 static RegisterOrConstant constant(int value) {
51 return RegisterOrConstant(value);
52 }
53
54 void MethodHandles::load_klass_from_Class(MacroAssembler* _masm, Register klass_reg, Register temp_reg, Register temp2_reg) {
55 if (VerifyMethodHandles)
56 verify_klass(_masm, klass_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_Class), temp_reg, temp2_reg,
57 "MH argument is a Class");
58 __ ld_ptr(Address(klass_reg, java_lang_Class::klass_offset_in_bytes()), klass_reg);
59 }
60
61 #ifdef ASSERT
62 static int check_nonzero(const char* xname, int x) {
63 assert(x != 0, "%s should be nonzero", xname);
64 return x;
65 }
66 #define NONZERO(x) check_nonzero(#x, x)
67 #else //ASSERT
68 #define NONZERO(x) (x)
69 #endif //ASSERT
70
71 #ifdef ASSERT
72 void MethodHandles::verify_klass(MacroAssembler* _masm,
73 Register obj_reg, SystemDictionary::WKID klass_id,
74 Register temp_reg, Register temp2_reg,
75 const char* error_message) {
76 InstanceKlass** klass_addr = SystemDictionary::well_known_klass_addr(klass_id);
77 Klass* klass = SystemDictionary::well_known_klass(klass_id);
78 bool did_save = false;
79 if (temp_reg == noreg || temp2_reg == noreg) {
80 temp_reg = L1;
81 temp2_reg = L2;
82 __ save_frame_and_mov(0, obj_reg, L0);
83 obj_reg = L0;
84 did_save = true;
85 }
86 Label L_ok, L_bad;
87 BLOCK_COMMENT("verify_klass {");
88 __ verify_oop(obj_reg);
89 __ br_null_short(obj_reg, Assembler::pn, L_bad);
90 __ load_klass(obj_reg, 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 intptr_t super_check_offset = klass->super_check_offset();
95 __ ld_ptr(Address(temp_reg, super_check_offset), temp_reg);
96 __ set(ExternalAddress((Metadata**)klass_addr), temp2_reg);
97 __ ld_ptr(Address(temp2_reg, 0), temp2_reg);
98 __ cmp_and_brx_short(temp_reg, temp2_reg, Assembler::equal, Assembler::pt, L_ok);
99 __ BIND(L_bad);
100 if (did_save) __ restore();
101 __ STOP(error_message);
102 __ BIND(L_ok);
103 if (did_save) __ restore();
104 BLOCK_COMMENT("} verify_klass");
105 }
106
107 void MethodHandles::verify_ref_kind(MacroAssembler* _masm, int ref_kind, Register member_reg, Register temp) {
108 Label L;
109 BLOCK_COMMENT("verify_ref_kind {");
110 __ lduw(Address(member_reg, NONZERO(java_lang_invoke_MemberName::flags_offset_in_bytes())), temp);
111 __ srl( temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT, temp);
112 __ and3(temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK, temp);
113 __ cmp_and_br_short(temp, ref_kind, Assembler::equal, Assembler::pt, L);
114 { char* buf = NEW_C_HEAP_ARRAY(char, 100, mtInternal);
115 jio_snprintf(buf, 100, "verify_ref_kind expected %x", ref_kind);
116 if (ref_kind == JVM_REF_invokeVirtual ||
117 ref_kind == JVM_REF_invokeSpecial)
118 // could do this for all ref_kinds, but would explode assembly code size
119 trace_method_handle(_masm, buf);
120 __ STOP(buf);
121 }
122 BLOCK_COMMENT("} verify_ref_kind");
123 __ bind(L);
124 }
125
126 #endif // ASSERT
127
128 void MethodHandles::jump_from_method_handle(MacroAssembler* _masm, Register method, Register target, Register temp,
129 bool for_compiler_entry) {
130 Label L_no_such_method;
131 assert(method == G5_method, "interpreter calling convention");
132 assert_different_registers(method, target, temp);
133
134 if (!for_compiler_entry && JvmtiExport::can_post_interpreter_events()) {
135 Label run_compiled_code;
136 // JVMTI events, such as single-stepping, are implemented partly by avoiding running
137 // compiled code in threads for which the event is enabled. Check here for
138 // interp_only_mode if these events CAN be enabled.
139 __ verify_thread();
140 const Address interp_only(G2_thread, JavaThread::interp_only_mode_offset());
141 __ ld(interp_only, temp);
142 __ cmp_and_br_short(temp, 0, Assembler::zero, Assembler::pt, run_compiled_code);
143 // Null method test is replicated below in compiled case,
144 // it might be able to address across the verify_thread()
145 __ br_null_short(G5_method, Assembler::pn, L_no_such_method);
146 __ ld_ptr(G5_method, in_bytes(Method::interpreter_entry_offset()), target);
147 __ jmp(target, 0);
148 __ delayed()->nop();
149 __ BIND(run_compiled_code);
150 // Note: we could fill some delay slots here, but
151 // it doesn't matter, since this is interpreter code.
152 }
153
154 // Compiled case, either static or fall-through from runtime conditional
155 __ br_null_short(G5_method, Assembler::pn, L_no_such_method);
156
157 const ByteSize entry_offset = for_compiler_entry ? Method::from_compiled_offset() :
158 Method::from_interpreted_offset();
159 __ ld_ptr(G5_method, in_bytes(entry_offset), target);
160 __ jmp(target, 0);
161 __ delayed()->nop();
162
163 __ bind(L_no_such_method);
164 AddressLiteral ame(StubRoutines::throw_AbstractMethodError_entry());
165 __ jump_to(ame, temp);
166 __ delayed()->nop();
167 }
168
169 void MethodHandles::jump_to_lambda_form(MacroAssembler* _masm,
170 Register recv, Register method_temp,
171 Register temp2, Register temp3,
172 bool for_compiler_entry) {
173 BLOCK_COMMENT("jump_to_lambda_form {");
174 // This is the initial entry point of a lazy method handle.
175 // After type checking, it picks up the invoker from the LambdaForm.
176 assert_different_registers(recv, method_temp, temp2); // temp3 is only passed on
177 assert(method_temp == G5_method, "required register for loading method");
178
179 //NOT_PRODUCT({ FlagSetting fs(TraceMethodHandles, true); trace_method_handle(_masm, "LZMH"); });
180
181 // Load the invoker, as MH -> MH.form -> LF.vmentry
182 __ verify_oop(recv);
183 __ load_heap_oop(Address(recv, NONZERO(java_lang_invoke_MethodHandle::form_offset_in_bytes())), method_temp);
184 __ verify_oop(method_temp);
185 __ load_heap_oop(Address(method_temp, NONZERO(java_lang_invoke_LambdaForm::vmentry_offset_in_bytes())), method_temp);
186 __ verify_oop(method_temp);
187 __ load_heap_oop(Address(method_temp, NONZERO(java_lang_invoke_MemberName::method_offset_in_bytes())), method_temp);
188 __ verify_oop(method_temp);
189 __ ld_ptr( Address(method_temp, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset_in_bytes())), method_temp);
190
191 if (VerifyMethodHandles && !for_compiler_entry) {
192 // make sure recv is already on stack
193 __ ld_ptr(method_temp, in_bytes(Method::const_offset()), temp2);
194 __ load_sized_value(Address(temp2, ConstMethod::size_of_parameters_offset()),
195 temp2,
196 sizeof(u2), /*is_signed*/ false);
197 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), "");
198 Label L;
199 __ ld_ptr(__ argument_address(temp2, temp2, -1), temp2);
200 __ cmp_and_br_short(temp2, recv, Assembler::equal, Assembler::pt, L);
201 __ STOP("receiver not on stack");
202 __ BIND(L);
203 }
204
205 jump_from_method_handle(_masm, method_temp, temp2, temp3, for_compiler_entry);
206 BLOCK_COMMENT("} jump_to_lambda_form");
207 }
208
209
210 // Code generation
211 address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm,
212 vmIntrinsics::ID iid) {
213 const bool not_for_compiler_entry = false; // this is the interpreter entry
214 assert(is_signature_polymorphic(iid), "expected invoke iid");
215 if (iid == vmIntrinsics::_invokeGeneric ||
216 iid == vmIntrinsics::_compiledLambdaForm) {
217 // Perhaps surprisingly, the symbolic references visible to Java are not directly used.
218 // They are linked to Java-generated adapters via MethodHandleNatives.linkMethod.
219 // They all allow an appendix argument.
220 __ should_not_reach_here(); // empty stubs make SG sick
221 return NULL;
222 }
223
224 // I5_savedSP/O5_savedSP: sender SP (must preserve; see prepare_to_jump_from_interpreted)
225 // G5_method: Method*
226 // G4 (Gargs): incoming argument list (must preserve)
227 // O0: used as temp to hold mh or receiver
228 // O1, O4: garbage temps, blown away
229 Register O1_scratch = O1;
230 Register O4_param_size = O4; // size of parameters
231
232 // here's where control starts out:
233 __ align(CodeEntryAlignment);
234 address entry_point = __ pc();
235
236 if (VerifyMethodHandles) {
237 assert(Method::intrinsic_id_size_in_bytes() == 2, "assuming Method::_intrinsic_id is u2");
238
239 Label L;
240 BLOCK_COMMENT("verify_intrinsic_id {");
241 __ lduh(Address(G5_method, Method::intrinsic_id_offset_in_bytes()), O1_scratch);
242 __ cmp_and_br_short(O1_scratch, (int) iid, Assembler::equal, Assembler::pt, L);
243 if (iid == vmIntrinsics::_linkToVirtual ||
244 iid == vmIntrinsics::_linkToSpecial) {
245 // could do this for all kinds, but would explode assembly code size
246 trace_method_handle(_masm, "bad Method*::intrinsic_id");
247 }
248 __ STOP("bad Method*::intrinsic_id");
249 __ bind(L);
250 BLOCK_COMMENT("} verify_intrinsic_id");
251 }
252
253 // First task: Find out how big the argument list is.
254 Address O4_first_arg_addr;
255 int ref_kind = signature_polymorphic_intrinsic_ref_kind(iid);
256 assert(ref_kind != 0 || iid == vmIntrinsics::_invokeBasic, "must be _invokeBasic or a linkTo intrinsic");
257 if (ref_kind == 0 || MethodHandles::ref_kind_has_receiver(ref_kind)) {
258 __ ld_ptr(G5_method, in_bytes(Method::const_offset()), O4_param_size);
259 __ load_sized_value(Address(O4_param_size, ConstMethod::size_of_parameters_offset()),
260 O4_param_size,
261 sizeof(u2), /*is_signed*/ false);
262 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), "");
263 O4_first_arg_addr = __ argument_address(O4_param_size, O4_param_size, -1);
264 } else {
265 DEBUG_ONLY(O4_param_size = noreg);
266 }
267
268 Register O0_mh = noreg;
269 if (!is_signature_polymorphic_static(iid)) {
270 __ ld_ptr(O4_first_arg_addr, O0_mh = O0);
271 DEBUG_ONLY(O4_param_size = noreg);
272 }
273
274 // O4_first_arg_addr is live!
275
276 if (TraceMethodHandles) {
277 if (O0_mh != noreg)
278 __ mov(O0_mh, G3_method_handle); // make stub happy
279 trace_method_handle_interpreter_entry(_masm, iid);
280 }
281
282 if (iid == vmIntrinsics::_invokeBasic) {
283 generate_method_handle_dispatch(_masm, iid, O0_mh, noreg, not_for_compiler_entry);
284
285 } else {
286 // Adjust argument list by popping the trailing MemberName argument.
287 Register O0_recv = noreg;
288 if (MethodHandles::ref_kind_has_receiver(ref_kind)) {
289 // Load the receiver (not the MH; the actual MemberName's receiver) up from the interpreter stack.
290 __ ld_ptr(O4_first_arg_addr, O0_recv = O0);
291 DEBUG_ONLY(O4_param_size = noreg);
292 }
293 Register G5_member = G5_method; // MemberName ptr; incoming method ptr is dead now
294 __ ld_ptr(__ argument_address(constant(0)), G5_member);
295 __ add(Gargs, Interpreter::stackElementSize, Gargs);
296 generate_method_handle_dispatch(_masm, iid, O0_recv, G5_member, not_for_compiler_entry);
297 }
298
299 return entry_point;
300 }
301
302 void MethodHandles::generate_method_handle_dispatch(MacroAssembler* _masm,
303 vmIntrinsics::ID iid,
304 Register receiver_reg,
305 Register member_reg,
306 bool for_compiler_entry) {
307 assert(is_signature_polymorphic(iid), "expected invoke iid");
308 Register temp1 = (for_compiler_entry ? G1_scratch : O1);
309 Register temp2 = (for_compiler_entry ? G3_scratch : O2);
310 Register temp3 = (for_compiler_entry ? G4_scratch : O3);
311 Register temp4 = (for_compiler_entry ? noreg : O4);
312 if (for_compiler_entry) {
313 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : O0), "only valid assignment");
314 assert_different_registers(temp1, O0, O1, O2, O3, O4, O5);
315 assert_different_registers(temp2, O0, O1, O2, O3, O4, O5);
316 assert_different_registers(temp3, O0, O1, O2, O3, O4, O5);
317 assert_different_registers(temp4, O0, O1, O2, O3, O4, O5);
318 } else {
319 assert_different_registers(temp1, temp2, temp3, temp4, O5_savedSP); // don't trash lastSP
320 }
321 if (receiver_reg != noreg) assert_different_registers(temp1, temp2, temp3, temp4, receiver_reg);
322 if (member_reg != noreg) assert_different_registers(temp1, temp2, temp3, temp4, member_reg);
323
324 if (iid == vmIntrinsics::_invokeBasic) {
325 // indirect through MH.form.vmentry.vmtarget
326 jump_to_lambda_form(_masm, receiver_reg, G5_method, temp1, temp2, for_compiler_entry);
327
328 } else {
329 // The method is a member invoker used by direct method handles.
330 if (VerifyMethodHandles) {
331 // make sure the trailing argument really is a MemberName (caller responsibility)
332 verify_klass(_masm, member_reg, SystemDictionary::WK_KLASS_ENUM_NAME(MemberName_klass),
333 temp1, temp2,
334 "MemberName required for invokeVirtual etc.");
335 }
336
337 Address member_clazz( member_reg, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes()));
338 Address member_vmindex( member_reg, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes()));
339 Address member_vmtarget( member_reg, NONZERO(java_lang_invoke_MemberName::method_offset_in_bytes()));
340 Address vmtarget_method( G5_method, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset_in_bytes()));
341
342 Register temp1_recv_klass = temp1;
343 if (iid != vmIntrinsics::_linkToStatic) {
344 __ verify_oop(receiver_reg);
345 if (iid == vmIntrinsics::_linkToSpecial) {
346 // Don't actually load the klass; just null-check the receiver.
347 __ null_check(receiver_reg);
348 } else {
349 // load receiver klass itself
350 __ null_check(receiver_reg, oopDesc::klass_offset_in_bytes());
351 __ load_klass(receiver_reg, temp1_recv_klass);
352 __ verify_klass_ptr(temp1_recv_klass);
353 }
354 BLOCK_COMMENT("check_receiver {");
355 // The receiver for the MemberName must be in receiver_reg.
356 // Check the receiver against the MemberName.clazz
357 if (VerifyMethodHandles && iid == vmIntrinsics::_linkToSpecial) {
358 // Did not load it above...
359 __ load_klass(receiver_reg, temp1_recv_klass);
360 __ verify_klass_ptr(temp1_recv_klass);
361 }
362 if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) {
363 Label L_ok;
364 Register temp2_defc = temp2;
365 __ load_heap_oop(member_clazz, temp2_defc);
366 load_klass_from_Class(_masm, temp2_defc, temp3, temp4);
367 __ verify_klass_ptr(temp2_defc);
368 __ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, temp4, L_ok);
369 // If we get here, the type check failed!
370 __ STOP("receiver class disagrees with MemberName.clazz");
371 __ bind(L_ok);
372 }
373 BLOCK_COMMENT("} check_receiver");
374 }
375 if (iid == vmIntrinsics::_linkToSpecial ||
376 iid == vmIntrinsics::_linkToStatic) {
377 DEBUG_ONLY(temp1_recv_klass = noreg); // these guys didn't load the recv_klass
378 }
379
380 // Live registers at this point:
381 // member_reg - MemberName that was the trailing argument
382 // temp1_recv_klass - klass of stacked receiver, if needed
383 // O5_savedSP - interpreter linkage (if interpreted)
384 // O0..O5 - compiler arguments (if compiled)
385
386 Label L_incompatible_class_change_error;
387 switch (iid) {
388 case vmIntrinsics::_linkToSpecial:
389 if (VerifyMethodHandles) {
390 verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp2);
391 }
392 __ load_heap_oop(member_vmtarget, G5_method);
393 __ ld_ptr(vmtarget_method, G5_method);
394 break;
395
396 case vmIntrinsics::_linkToStatic:
397 if (VerifyMethodHandles) {
398 verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp2);
399 }
400 __ load_heap_oop(member_vmtarget, G5_method);
401 __ ld_ptr(vmtarget_method, G5_method);
402 break;
403
404 case vmIntrinsics::_linkToVirtual:
405 {
406 // same as TemplateTable::invokevirtual,
407 // minus the CP setup and profiling:
408
409 if (VerifyMethodHandles) {
410 verify_ref_kind(_masm, JVM_REF_invokeVirtual, member_reg, temp2);
411 }
412
413 // pick out the vtable index from the MemberName, and then we can discard it:
414 Register temp2_index = temp2;
415 __ ld_ptr(member_vmindex, temp2_index);
416
417 if (VerifyMethodHandles) {
418 Label L_index_ok;
419 __ cmp_and_br_short(temp2_index, (int) 0, Assembler::greaterEqual, Assembler::pn, L_index_ok);
420 __ STOP("no virtual index");
421 __ BIND(L_index_ok);
422 }
423
424 // Note: The verifier invariants allow us to ignore MemberName.clazz and vmtarget
425 // at this point. And VerifyMethodHandles has already checked clazz, if needed.
426
427 // get target Method* & entry point
428 __ lookup_virtual_method(temp1_recv_klass, temp2_index, G5_method);
429 break;
430 }
431
432 case vmIntrinsics::_linkToInterface:
433 {
434 // same as TemplateTable::invokeinterface
435 // (minus the CP setup and profiling, with different argument motion)
436 if (VerifyMethodHandles) {
437 verify_ref_kind(_masm, JVM_REF_invokeInterface, member_reg, temp2);
438 }
439
440 Register temp2_intf = temp2;
441 __ load_heap_oop(member_clazz, temp2_intf);
442 load_klass_from_Class(_masm, temp2_intf, temp3, temp4);
443 __ verify_klass_ptr(temp2_intf);
444
445 Register G5_index = G5_method;
446 __ ld_ptr(member_vmindex, G5_index);
447 if (VerifyMethodHandles) {
448 Label L;
449 __ cmp_and_br_short(G5_index, 0, Assembler::greaterEqual, Assembler::pt, L);
450 __ STOP("invalid vtable index for MH.invokeInterface");
451 __ bind(L);
452 }
453
454 // given intf, index, and recv klass, dispatch to the implementation method
455 __ lookup_interface_method(temp1_recv_klass, temp2_intf,
456 // note: next two args must be the same:
457 G5_index, G5_method,
458 temp3, temp4,
459 L_incompatible_class_change_error);
460 break;
461 }
462
463 default:
464 fatal("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid));
465 break;
466 }
467
468 // Live at this point:
469 // G5_method
470 // O5_savedSP (if interpreted)
471
472 // After figuring out which concrete method to call, jump into it.
473 // Note that this works in the interpreter with no data motion.
474 // But the compiled version will require that rcx_recv be shifted out.
475 __ verify_method_ptr(G5_method);
476 jump_from_method_handle(_masm, G5_method, temp1, temp2, for_compiler_entry);
477
478 if (iid == vmIntrinsics::_linkToInterface) {
479 __ BIND(L_incompatible_class_change_error);
480 AddressLiteral icce(StubRoutines::throw_IncompatibleClassChangeError_entry());
481 __ jump_to(icce, temp1);
482 __ delayed()->nop();
483 }
484 }
485 }
486
487 #ifndef PRODUCT
488 void trace_method_handle_stub(const char* adaptername,
489 oopDesc* mh,
490 intptr_t* saved_sp,
491 intptr_t* args,
492 intptr_t* tracing_fp) {
493 bool has_mh = (strstr(adaptername, "/static") == NULL &&
494 strstr(adaptername, "linkTo") == NULL); // static linkers don't have MH
495 const char* mh_reg_name = has_mh ? "G3_mh" : "G3";
496 tty->print_cr("MH %s %s=" INTPTR_FORMAT " saved_sp=" INTPTR_FORMAT " args=" INTPTR_FORMAT,
497 adaptername, mh_reg_name,
498 p2i(mh), p2i(saved_sp), p2i(args));
499
500 if (Verbose) {
501 // dumping last frame with frame::describe
502
503 JavaThread* p = JavaThread::active();
504
505 ResourceMark rm;
506 PRESERVE_EXCEPTION_MARK; // may not be needed by safer and unexpensive here
507 FrameValues values;
508
509 // Note: We want to allow trace_method_handle from any call site.
510 // While trace_method_handle creates a frame, it may be entered
511 // without a valid return PC in O7 (e.g. not just after a call).
512 // Walking that frame could lead to failures due to that invalid PC.
513 // => carefully detect that frame when doing the stack walking
514
515 // walk up to the right frame using the "tracing_fp" argument
516 intptr_t* cur_sp = StubRoutines::Sparc::flush_callers_register_windows_func()();
517 frame cur_frame(cur_sp, frame::unpatchable, NULL);
518
519 while (cur_frame.fp() != (intptr_t *)(STACK_BIAS+(uintptr_t)tracing_fp)) {
520 cur_frame = os::get_sender_for_C_frame(&cur_frame);
521 }
522
523 // safely create a frame and call frame::describe
524 intptr_t *dump_sp = cur_frame.sender_sp();
525 intptr_t *dump_fp = cur_frame.link();
526
527 bool walkable = has_mh; // whether the traced frame shoud be walkable
528
529 // the sender for cur_frame is the caller of trace_method_handle
530 if (walkable) {
531 // The previous definition of walkable may have to be refined
532 // if new call sites cause the next frame constructor to start
533 // failing. Alternatively, frame constructors could be
534 // modified to support the current or future non walkable
535 // frames (but this is more intrusive and is not considered as
536 // part of this RFE, which will instead use a simpler output).
537 frame dump_frame = frame(dump_sp,
538 cur_frame.sp(), // younger_sp
539 false); // no adaptation
540 dump_frame.describe(values, 1);
541 } else {
542 // Robust dump for frames which cannot be constructed from sp/younger_sp
543 // Add descriptions without building a Java frame to avoid issues
544 values.describe(-1, dump_fp, "fp for #1 <not parsed, cannot trust pc>");
545 values.describe(-1, dump_sp, "sp");
546 }
547
548 bool has_args = has_mh; // whether Gargs is meaningful
549
550 // mark args, if seems valid (may not be valid for some adapters)
551 if (has_args) {
552 if ((args >= dump_sp) && (args < dump_fp)) {
553 values.describe(-1, args, "*G4_args");
554 }
555 }
556
557 // mark saved_sp, if seems valid (may not be valid for some adapters)
558 intptr_t *unbiased_sp = (intptr_t *)(STACK_BIAS+(uintptr_t)saved_sp);
559 const int ARG_LIMIT = 255, SLOP = 45, UNREASONABLE_STACK_MOVE = (ARG_LIMIT + SLOP);
560 if ((unbiased_sp >= dump_sp - UNREASONABLE_STACK_MOVE) && (unbiased_sp < dump_fp)) {
561 values.describe(-1, unbiased_sp, "*saved_sp+STACK_BIAS");
562 }
563
564 // Note: the unextended_sp may not be correct
565 tty->print_cr(" stack layout:");
566 values.print(p);
567 if (has_mh && oopDesc::is_oop(mh)) {
568 mh->print();
569 if (java_lang_invoke_MethodHandle::is_instance(mh)) {
570 if (java_lang_invoke_MethodHandle::form_offset_in_bytes() != 0)
571 java_lang_invoke_MethodHandle::form(mh)->print();
572 }
573 }
574 }
575 }
576
577 void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) {
578 if (!TraceMethodHandles) return;
579 BLOCK_COMMENT("trace_method_handle {");
580 // save: Gargs, O5_savedSP
581 __ save_frame(16); // need space for saving required FPU state
582
583 __ set((intptr_t) adaptername, O0);
584 __ mov(G3_method_handle, O1);
585 __ mov(I5_savedSP, O2);
586 __ mov(Gargs, O3);
587 __ mov(I6, O4); // frame identifier for safe stack walking
588
589 // Save scratched registers that might be needed. Robustness is more
590 // important than optimizing the saves for this debug only code.
591
592 // save FP result, valid at some call sites (adapter_opt_return_float, ...)
593 Address d_save(FP, -sizeof(jdouble) + STACK_BIAS);
594 __ stf(FloatRegisterImpl::D, Ftos_d, d_save);
595 // Safely save all globals but G2 (handled by call_VM_leaf) and G7
596 // (OS reserved).
597 __ mov(G3_method_handle, L3);
598 __ mov(Gargs, L4);
599 __ mov(G5_method_type, L5);
600 __ mov(G6, L6);
601 __ mov(G1, L1);
602
603 __ call_VM_leaf(L2 /* for G2 */, CAST_FROM_FN_PTR(address, trace_method_handle_stub));
604
605 __ mov(L3, G3_method_handle);
606 __ mov(L4, Gargs);
607 __ mov(L5, G5_method_type);
608 __ mov(L6, G6);
609 __ mov(L1, G1);
610 __ ldf(FloatRegisterImpl::D, d_save, Ftos_d);
611
612 __ restore();
613 BLOCK_COMMENT("} trace_method_handle");
614 }
615 #endif // PRODUCT