1 /*
2 * Copyright (c) 2008, 2015, 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 "prims/methodHandles.hpp"
32
33 #define __ _masm->
34
35 #ifdef PRODUCT
36 #define BLOCK_COMMENT(str) /* nothing */
37 #define STOP(error) stop(error)
38 #else
39 #define BLOCK_COMMENT(str) __ block_comment(str)
40 #define STOP(error) block_comment(error); __ stop(error)
41 #endif
42
43 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":")
44
45 // Workaround for C++ overloading nastiness on '0' for RegisterOrConstant.
46 static RegisterOrConstant constant(int value) {
47 return RegisterOrConstant(value);
48 }
49
50 void MethodHandles::load_klass_from_Class(MacroAssembler* _masm, Register klass_reg, Register temp_reg, Register temp2_reg) {
51 if (VerifyMethodHandles)
52 verify_klass(_masm, klass_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_Class), temp_reg, temp2_reg,
53 "MH argument is a Class");
54 __ ld_ptr(Address(klass_reg, java_lang_Class::klass_offset_in_bytes()), klass_reg);
55 }
56
57 #ifdef ASSERT
58 static int check_nonzero(const char* xname, int x) {
59 assert(x != 0, "%s should be nonzero", xname);
60 return x;
61 }
62 #define NONZERO(x) check_nonzero(#x, x)
63 #else //ASSERT
64 #define NONZERO(x) (x)
65 #endif //ASSERT
66
67 #ifdef ASSERT
68 void MethodHandles::verify_klass(MacroAssembler* _masm,
69 Register obj_reg, SystemDictionary::WKID klass_id,
70 Register temp_reg, Register temp2_reg,
71 const char* error_message) {
72 Klass** klass_addr = SystemDictionary::well_known_klass_addr(klass_id);
73 KlassHandle klass = SystemDictionary::well_known_klass(klass_id);
74 bool did_save = false;
75 if (temp_reg == noreg || temp2_reg == noreg) {
76 temp_reg = L1;
77 temp2_reg = L2;
78 __ save_frame_and_mov(0, obj_reg, L0);
79 obj_reg = L0;
80 did_save = true;
81 }
82 Label L_ok, L_bad;
83 BLOCK_COMMENT("verify_klass {");
84 __ verify_oop(obj_reg);
85 __ br_null_short(obj_reg, Assembler::pn, L_bad);
86 __ load_klass(obj_reg, temp_reg);
87 __ set(ExternalAddress((Metadata**)klass_addr), temp2_reg);
88 __ ld_ptr(Address(temp2_reg, 0), temp2_reg);
89 __ cmp_and_brx_short(temp_reg, temp2_reg, Assembler::equal, Assembler::pt, L_ok);
90 intptr_t super_check_offset = klass->super_check_offset();
91 __ ld_ptr(Address(temp_reg, super_check_offset), temp_reg);
92 __ set(ExternalAddress((Metadata**)klass_addr), temp2_reg);
93 __ ld_ptr(Address(temp2_reg, 0), temp2_reg);
94 __ cmp_and_brx_short(temp_reg, temp2_reg, Assembler::equal, Assembler::pt, L_ok);
95 __ BIND(L_bad);
96 if (did_save) __ restore();
97 __ STOP(error_message);
98 __ BIND(L_ok);
99 if (did_save) __ restore();
100 BLOCK_COMMENT("} verify_klass");
101 }
102
103 void MethodHandles::verify_ref_kind(MacroAssembler* _masm, int ref_kind, Register member_reg, Register temp) {
104 Label L;
105 BLOCK_COMMENT("verify_ref_kind {");
106 __ lduw(Address(member_reg, NONZERO(java_lang_invoke_MemberName::flags_offset_in_bytes())), temp);
107 __ srl( temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT, temp);
108 __ and3(temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK, temp);
109 __ cmp_and_br_short(temp, ref_kind, Assembler::equal, Assembler::pt, L);
110 { char* buf = NEW_C_HEAP_ARRAY(char, 100, mtInternal);
111 jio_snprintf(buf, 100, "verify_ref_kind expected %x", ref_kind);
112 if (ref_kind == JVM_REF_invokeVirtual ||
113 ref_kind == JVM_REF_invokeSpecial)
114 // could do this for all ref_kinds, but would explode assembly code size
115 trace_method_handle(_masm, buf);
116 __ STOP(buf);
117 }
118 BLOCK_COMMENT("} verify_ref_kind");
119 __ bind(L);
120 }
121
122 #endif // ASSERT
123
124 void MethodHandles::jump_from_method_handle(MacroAssembler* _masm, Register method, Register target, Register temp,
125 bool for_compiler_entry) {
126 Label L_no_such_method;
127 assert(method == G5_method, "interpreter calling convention");
128 assert_different_registers(method, target, temp);
129
130 if (!for_compiler_entry && JvmtiExport::can_post_interpreter_events()) {
131 Label run_compiled_code;
132 // JVMTI events, such as single-stepping, are implemented partly by avoiding running
133 // compiled code in threads for which the event is enabled. Check here for
134 // interp_only_mode if these events CAN be enabled.
135 __ verify_thread();
136 const Address interp_only(G2_thread, JavaThread::interp_only_mode_offset());
137 __ ld(interp_only, temp);
138 __ cmp_and_br_short(temp, 0, Assembler::zero, Assembler::pt, run_compiled_code);
139 // Null method test is replicated below in compiled case,
140 // it might be able to address across the verify_thread()
141 __ br_null_short(G5_method, Assembler::pn, L_no_such_method);
142 __ ld_ptr(G5_method, in_bytes(Method::interpreter_entry_offset()), target);
143 __ jmp(target, 0);
144 __ delayed()->nop();
145 __ BIND(run_compiled_code);
146 // Note: we could fill some delay slots here, but
147 // it doesn't matter, since this is interpreter code.
148 }
149
150 // Compiled case, either static or fall-through from runtime conditional
151 __ br_null_short(G5_method, Assembler::pn, L_no_such_method);
152
153 const ByteSize entry_offset = for_compiler_entry ? Method::from_compiled_offset() :
154 Method::from_interpreted_offset();
155 __ ld_ptr(G5_method, in_bytes(entry_offset), target);
156 __ jmp(target, 0);
157 __ delayed()->nop();
158
159 __ bind(L_no_such_method);
160 AddressLiteral ame(StubRoutines::throw_AbstractMethodError_entry());
161 __ jump_to(ame, temp);
162 __ delayed()->nop();
163 }
164
165 void MethodHandles::jump_to_lambda_form(MacroAssembler* _masm,
166 Register recv, Register method_temp,
167 Register temp2, Register temp3,
168 bool for_compiler_entry) {
169 BLOCK_COMMENT("jump_to_lambda_form {");
170 // This is the initial entry point of a lazy method handle.
171 // After type checking, it picks up the invoker from the LambdaForm.
172 assert_different_registers(recv, method_temp, temp2); // temp3 is only passed on
173 assert(method_temp == G5_method, "required register for loading method");
174
175 //NOT_PRODUCT({ FlagSetting fs(TraceMethodHandles, true); trace_method_handle(_masm, "LZMH"); });
176
177 // Load the invoker, as MH -> MH.form -> LF.vmentry
178 __ verify_oop(recv);
179 __ load_heap_oop(Address(recv, NONZERO(java_lang_invoke_MethodHandle::form_offset_in_bytes())), method_temp);
180 __ verify_oop(method_temp);
181 __ load_heap_oop(Address(method_temp, NONZERO(java_lang_invoke_LambdaForm::vmentry_offset_in_bytes())), method_temp);
182 __ verify_oop(method_temp);
183 // the following assumes that a Method* is normally compressed in the vmtarget field:
184 __ ld_ptr( Address(method_temp, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes())), method_temp);
185
186 if (VerifyMethodHandles && !for_compiler_entry) {
187 // make sure recv is already on stack
188 __ ld_ptr(method_temp, in_bytes(Method::const_offset()), temp2);
189 __ load_sized_value(Address(temp2, ConstMethod::size_of_parameters_offset()),
190 temp2,
191 sizeof(u2), /*is_signed*/ false);
192 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), "");
193 Label L;
194 __ ld_ptr(__ argument_address(temp2, temp2, -1), temp2);
195 __ cmp_and_br_short(temp2, recv, Assembler::equal, Assembler::pt, L);
196 __ STOP("receiver not on stack");
197 __ BIND(L);
198 }
199
200 jump_from_method_handle(_masm, method_temp, temp2, temp3, for_compiler_entry);
201 BLOCK_COMMENT("} jump_to_lambda_form");
202 }
203
204
205 // Code generation
206 address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm,
207 vmIntrinsics::ID iid) {
208 const bool not_for_compiler_entry = false; // this is the interpreter entry
209 assert(is_signature_polymorphic(iid), "expected invoke iid");
210 if (iid == vmIntrinsics::_invokeGeneric ||
211 iid == vmIntrinsics::_compiledLambdaForm) {
212 // Perhaps surprisingly, the symbolic references visible to Java are not directly used.
213 // They are linked to Java-generated adapters via MethodHandleNatives.linkMethod.
214 // They all allow an appendix argument.
215 __ should_not_reach_here(); // empty stubs make SG sick
216 return NULL;
217 }
218
219 // I5_savedSP/O5_savedSP: sender SP (must preserve; see prepare_to_jump_from_interpreted)
220 // G5_method: Method*
221 // G4 (Gargs): incoming argument list (must preserve)
222 // O0: used as temp to hold mh or receiver
223 // O1, O4: garbage temps, blown away
224 Register O1_scratch = O1;
225 Register O4_param_size = O4; // size of parameters
226
227 // here's where control starts out:
228 __ align(CodeEntryAlignment);
229 address entry_point = __ pc();
230
231 if (VerifyMethodHandles) {
232 assert(Method::intrinsic_id_size_in_bytes() == 2, "assuming Method::_intrinsic_id is u2");
233
234 Label L;
235 BLOCK_COMMENT("verify_intrinsic_id {");
236 __ lduh(Address(G5_method, Method::intrinsic_id_offset_in_bytes()), O1_scratch);
237 __ cmp_and_br_short(O1_scratch, (int) iid, Assembler::equal, Assembler::pt, L);
238 if (iid == vmIntrinsics::_linkToVirtual ||
239 iid == vmIntrinsics::_linkToSpecial) {
240 // could do this for all kinds, but would explode assembly code size
241 trace_method_handle(_masm, "bad Method*::intrinsic_id");
242 }
243 __ STOP("bad Method*::intrinsic_id");
244 __ bind(L);
245 BLOCK_COMMENT("} verify_intrinsic_id");
246 }
247
248 // First task: Find out how big the argument list is.
249 Address O4_first_arg_addr;
250 int ref_kind = signature_polymorphic_intrinsic_ref_kind(iid);
251 assert(ref_kind != 0 || iid == vmIntrinsics::_invokeBasic, "must be _invokeBasic or a linkTo intrinsic");
252 if (ref_kind == 0 || MethodHandles::ref_kind_has_receiver(ref_kind)) {
253 __ ld_ptr(G5_method, in_bytes(Method::const_offset()), O4_param_size);
254 __ load_sized_value(Address(O4_param_size, ConstMethod::size_of_parameters_offset()),
255 O4_param_size,
256 sizeof(u2), /*is_signed*/ false);
257 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), "");
258 O4_first_arg_addr = __ argument_address(O4_param_size, O4_param_size, -1);
259 } else {
260 DEBUG_ONLY(O4_param_size = noreg);
261 }
262
263 Register O0_mh = noreg;
264 if (!is_signature_polymorphic_static(iid)) {
265 __ ld_ptr(O4_first_arg_addr, O0_mh = O0);
266 DEBUG_ONLY(O4_param_size = noreg);
267 }
268
269 // O4_first_arg_addr is live!
270
271 if (TraceMethodHandles) {
272 if (O0_mh != noreg)
273 __ mov(O0_mh, G3_method_handle); // make stub happy
274 trace_method_handle_interpreter_entry(_masm, iid);
275 }
276
277 if (iid == vmIntrinsics::_invokeBasic) {
278 generate_method_handle_dispatch(_masm, iid, O0_mh, noreg, not_for_compiler_entry);
279
280 } else {
281 // Adjust argument list by popping the trailing MemberName argument.
282 Register O0_recv = noreg;
283 if (MethodHandles::ref_kind_has_receiver(ref_kind)) {
284 // Load the receiver (not the MH; the actual MemberName's receiver) up from the interpreter stack.
285 __ ld_ptr(O4_first_arg_addr, O0_recv = O0);
286 DEBUG_ONLY(O4_param_size = noreg);
287 }
288 Register G5_member = G5_method; // MemberName ptr; incoming method ptr is dead now
289 __ ld_ptr(__ argument_address(constant(0)), G5_member);
290 __ add(Gargs, Interpreter::stackElementSize, Gargs);
291 generate_method_handle_dispatch(_masm, iid, O0_recv, G5_member, not_for_compiler_entry);
292 }
293
294 return entry_point;
295 }
296
297 void MethodHandles::generate_method_handle_dispatch(MacroAssembler* _masm,
298 vmIntrinsics::ID iid,
299 Register receiver_reg,
300 Register member_reg,
301 bool for_compiler_entry) {
302 assert(is_signature_polymorphic(iid), "expected invoke iid");
303 Register temp1 = (for_compiler_entry ? G1_scratch : O1);
304 Register temp2 = (for_compiler_entry ? G3_scratch : O2);
305 Register temp3 = (for_compiler_entry ? G4_scratch : O3);
306 Register temp4 = (for_compiler_entry ? noreg : O4);
307 if (for_compiler_entry) {
308 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : O0), "only valid assignment");
309 assert_different_registers(temp1, O0, O1, O2, O3, O4, O5);
310 assert_different_registers(temp2, O0, O1, O2, O3, O4, O5);
311 assert_different_registers(temp3, O0, O1, O2, O3, O4, O5);
312 assert_different_registers(temp4, O0, O1, O2, O3, O4, O5);
313 } else {
314 assert_different_registers(temp1, temp2, temp3, temp4, O5_savedSP); // don't trash lastSP
315 }
316 if (receiver_reg != noreg) assert_different_registers(temp1, temp2, temp3, temp4, receiver_reg);
317 if (member_reg != noreg) assert_different_registers(temp1, temp2, temp3, temp4, member_reg);
318
319 if (iid == vmIntrinsics::_invokeBasic) {
320 // indirect through MH.form.vmentry.vmtarget
321 jump_to_lambda_form(_masm, receiver_reg, G5_method, temp1, temp2, for_compiler_entry);
322
323 } else {
324 // The method is a member invoker used by direct method handles.
325 if (VerifyMethodHandles) {
326 // make sure the trailing argument really is a MemberName (caller responsibility)
327 verify_klass(_masm, member_reg, SystemDictionary::WK_KLASS_ENUM_NAME(MemberName_klass),
328 temp1, temp2,
329 "MemberName required for invokeVirtual etc.");
330 }
331
332 Address member_clazz( member_reg, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes()));
333 Address member_vmindex( member_reg, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes()));
334 Address member_vmtarget( member_reg, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes()));
335
336 Register temp1_recv_klass = temp1;
337 if (iid != vmIntrinsics::_linkToStatic) {
338 __ verify_oop(receiver_reg);
339 if (iid == vmIntrinsics::_linkToSpecial) {
340 // Don't actually load the klass; just null-check the receiver.
341 __ null_check(receiver_reg);
342 } else {
343 // load receiver klass itself
344 __ null_check(receiver_reg, oopDesc::klass_offset_in_bytes());
345 __ load_klass(receiver_reg, temp1_recv_klass);
346 __ verify_klass_ptr(temp1_recv_klass);
347 }
348 BLOCK_COMMENT("check_receiver {");
349 // The receiver for the MemberName must be in receiver_reg.
350 // Check the receiver against the MemberName.clazz
351 if (VerifyMethodHandles && iid == vmIntrinsics::_linkToSpecial) {
352 // Did not load it above...
353 __ load_klass(receiver_reg, temp1_recv_klass);
354 __ verify_klass_ptr(temp1_recv_klass);
355 }
356 if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) {
357 Label L_ok;
358 Register temp2_defc = temp2;
359 __ load_heap_oop(member_clazz, temp2_defc);
360 load_klass_from_Class(_masm, temp2_defc, temp3, temp4);
361 __ verify_klass_ptr(temp2_defc);
362 __ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, temp4, L_ok);
363 // If we get here, the type check failed!
364 __ STOP("receiver class disagrees with MemberName.clazz");
365 __ bind(L_ok);
366 }
367 BLOCK_COMMENT("} check_receiver");
368 }
369 if (iid == vmIntrinsics::_linkToSpecial ||
370 iid == vmIntrinsics::_linkToStatic) {
371 DEBUG_ONLY(temp1_recv_klass = noreg); // these guys didn't load the recv_klass
372 }
373
374 // Live registers at this point:
375 // member_reg - MemberName that was the trailing argument
376 // temp1_recv_klass - klass of stacked receiver, if needed
377 // O5_savedSP - interpreter linkage (if interpreted)
378 // O0..O5 - compiler arguments (if compiled)
379
380 Label L_incompatible_class_change_error;
381 switch (iid) {
382 case vmIntrinsics::_linkToSpecial:
383 if (VerifyMethodHandles) {
384 verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp2);
385 }
386 __ ld_ptr(member_vmtarget, G5_method);
387 break;
388
389 case vmIntrinsics::_linkToStatic:
390 if (VerifyMethodHandles) {
391 verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp2);
392 }
393 __ ld_ptr(member_vmtarget, G5_method);
394 break;
395
396 case vmIntrinsics::_linkToVirtual:
397 {
398 // same as TemplateTable::invokevirtual,
399 // minus the CP setup and profiling:
400
401 if (VerifyMethodHandles) {
402 verify_ref_kind(_masm, JVM_REF_invokeVirtual, member_reg, temp2);
403 }
404
405 // pick out the vtable index from the MemberName, and then we can discard it:
406 Register temp2_index = temp2;
407 __ ld_ptr(member_vmindex, temp2_index);
408
409 if (VerifyMethodHandles) {
410 Label L_index_ok;
411 __ cmp_and_br_short(temp2_index, (int) 0, Assembler::greaterEqual, Assembler::pn, L_index_ok);
412 __ STOP("no virtual index");
413 __ BIND(L_index_ok);
414 }
415
416 // Note: The verifier invariants allow us to ignore MemberName.clazz and vmtarget
417 // at this point. And VerifyMethodHandles has already checked clazz, if needed.
418
419 // get target Method* & entry point
420 __ lookup_virtual_method(temp1_recv_klass, temp2_index, G5_method);
421 break;
422 }
423
424 case vmIntrinsics::_linkToInterface:
425 {
426 // same as TemplateTable::invokeinterface
427 // (minus the CP setup and profiling, with different argument motion)
428 if (VerifyMethodHandles) {
429 verify_ref_kind(_masm, JVM_REF_invokeInterface, member_reg, temp2);
430 }
431
432 Register temp2_intf = temp2;
433 __ load_heap_oop(member_clazz, temp2_intf);
434 load_klass_from_Class(_masm, temp2_intf, temp3, temp4);
435 __ verify_klass_ptr(temp2_intf);
436
437 Register G5_index = G5_method;
438 __ ld_ptr(member_vmindex, G5_index);
439 if (VerifyMethodHandles) {
440 Label L;
441 __ cmp_and_br_short(G5_index, 0, Assembler::greaterEqual, Assembler::pt, L);
442 __ STOP("invalid vtable index for MH.invokeInterface");
443 __ bind(L);
444 }
445
446 // given intf, index, and recv klass, dispatch to the implementation method
447 __ lookup_interface_method(temp1_recv_klass, temp2_intf,
448 // note: next two args must be the same:
449 G5_index, G5_method,
450 temp3, temp4,
451 L_incompatible_class_change_error);
452 break;
453 }
454
455 default:
456 fatal("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid));
457 break;
458 }
459
460 // Live at this point:
461 // G5_method
462 // O5_savedSP (if interpreted)
463
464 // After figuring out which concrete method to call, jump into it.
465 // Note that this works in the interpreter with no data motion.
466 // But the compiled version will require that rcx_recv be shifted out.
467 __ verify_method_ptr(G5_method);
468 jump_from_method_handle(_masm, G5_method, temp1, temp2, for_compiler_entry);
469
470 if (iid == vmIntrinsics::_linkToInterface) {
471 __ BIND(L_incompatible_class_change_error);
472 AddressLiteral icce(StubRoutines::throw_IncompatibleClassChangeError_entry());
473 __ jump_to(icce, temp1);
474 __ delayed()->nop();
475 }
476 }
477 }
478
479 #ifndef PRODUCT
480 void trace_method_handle_stub(const char* adaptername,
481 oopDesc* mh,
482 intptr_t* saved_sp,
483 intptr_t* args,
484 intptr_t* tracing_fp) {
485 bool has_mh = (strstr(adaptername, "/static") == NULL &&
486 strstr(adaptername, "linkTo") == NULL); // static linkers don't have MH
487 const char* mh_reg_name = has_mh ? "G3_mh" : "G3";
488 tty->print_cr("MH %s %s=" INTPTR_FORMAT " saved_sp=" INTPTR_FORMAT " args=" INTPTR_FORMAT,
489 adaptername, mh_reg_name,
490 p2i(mh), p2i(saved_sp), p2i(args));
491
492 if (Verbose) {
493 // dumping last frame with frame::describe
494
495 JavaThread* p = JavaThread::active();
496
497 ResourceMark rm;
498 PRESERVE_EXCEPTION_MARK; // may not be needed by safer and unexpensive here
499 FrameValues values;
500
501 // Note: We want to allow trace_method_handle from any call site.
502 // While trace_method_handle creates a frame, it may be entered
503 // without a valid return PC in O7 (e.g. not just after a call).
504 // Walking that frame could lead to failures due to that invalid PC.
505 // => carefully detect that frame when doing the stack walking
506
507 // walk up to the right frame using the "tracing_fp" argument
508 intptr_t* cur_sp = StubRoutines::Sparc::flush_callers_register_windows_func()();
509 frame cur_frame(cur_sp, frame::unpatchable, NULL);
510
511 while (cur_frame.fp() != (intptr_t *)(STACK_BIAS+(uintptr_t)tracing_fp)) {
512 cur_frame = os::get_sender_for_C_frame(&cur_frame);
513 }
514
515 // safely create a frame and call frame::describe
516 intptr_t *dump_sp = cur_frame.sender_sp();
517 intptr_t *dump_fp = cur_frame.link();
518
519 bool walkable = has_mh; // whether the traced frame shoud be walkable
520
521 // the sender for cur_frame is the caller of trace_method_handle
522 if (walkable) {
523 // The previous definition of walkable may have to be refined
524 // if new call sites cause the next frame constructor to start
525 // failing. Alternatively, frame constructors could be
526 // modified to support the current or future non walkable
527 // frames (but this is more intrusive and is not considered as
528 // part of this RFE, which will instead use a simpler output).
529 frame dump_frame = frame(dump_sp,
530 cur_frame.sp(), // younger_sp
531 false); // no adaptation
532 dump_frame.describe(values, 1);
533 } else {
534 // Robust dump for frames which cannot be constructed from sp/younger_sp
535 // Add descriptions without building a Java frame to avoid issues
536 values.describe(-1, dump_fp, "fp for #1 <not parsed, cannot trust pc>");
537 values.describe(-1, dump_sp, "sp");
538 }
539
540 bool has_args = has_mh; // whether Gargs is meaningful
541
542 // mark args, if seems valid (may not be valid for some adapters)
543 if (has_args) {
544 if ((args >= dump_sp) && (args < dump_fp)) {
545 values.describe(-1, args, "*G4_args");
546 }
547 }
548
549 // mark saved_sp, if seems valid (may not be valid for some adapters)
550 intptr_t *unbiased_sp = (intptr_t *)(STACK_BIAS+(uintptr_t)saved_sp);
551 const int ARG_LIMIT = 255, SLOP = 45, UNREASONABLE_STACK_MOVE = (ARG_LIMIT + SLOP);
552 if ((unbiased_sp >= dump_sp - UNREASONABLE_STACK_MOVE) && (unbiased_sp < dump_fp)) {
553 values.describe(-1, unbiased_sp, "*saved_sp+STACK_BIAS");
554 }
555
556 // Note: the unextended_sp may not be correct
557 tty->print_cr(" stack layout:");
558 values.print(p);
559 if (has_mh && mh->is_oop()) {
560 mh->print();
561 if (java_lang_invoke_MethodHandle::is_instance(mh)) {
562 if (java_lang_invoke_MethodHandle::form_offset_in_bytes() != 0)
563 java_lang_invoke_MethodHandle::form(mh)->print();
564 }
565 }
566 }
567 }
568
569 void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) {
570 if (!TraceMethodHandles) return;
571 BLOCK_COMMENT("trace_method_handle {");
572 // save: Gargs, O5_savedSP
573 __ save_frame(16); // need space for saving required FPU state
574
575 __ set((intptr_t) adaptername, O0);
576 __ mov(G3_method_handle, O1);
577 __ mov(I5_savedSP, O2);
578 __ mov(Gargs, O3);
579 __ mov(I6, O4); // frame identifier for safe stack walking
580
581 // Save scratched registers that might be needed. Robustness is more
582 // important than optimizing the saves for this debug only code.
583
584 // save FP result, valid at some call sites (adapter_opt_return_float, ...)
585 Address d_save(FP, -sizeof(jdouble) + STACK_BIAS);
586 __ stf(FloatRegisterImpl::D, Ftos_d, d_save);
587 // Safely save all globals but G2 (handled by call_VM_leaf) and G7
588 // (OS reserved).
589 __ mov(G3_method_handle, L3);
590 __ mov(Gargs, L4);
591 __ mov(G5_method_type, L5);
592 __ mov(G6, L6);
593 __ mov(G1, L1);
594
595 __ call_VM_leaf(L2 /* for G2 */, CAST_FROM_FN_PTR(address, trace_method_handle_stub));
596
597 __ mov(L3, G3_method_handle);
598 __ mov(L4, Gargs);
599 __ mov(L5, G5_method_type);
600 __ mov(L6, G6);
601 __ mov(L1, G1);
602 __ ldf(FloatRegisterImpl::D, d_save, Ftos_d);
603
604 __ restore();
605 BLOCK_COMMENT("} trace_method_handle");
606 }
607 #endif // PRODUCT