1 /*
2 * Copyright (c) 2008, 2012, 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 "interpreter/interpreter.hpp"
27 #include "memory/allocation.inline.hpp"
28 #include "prims/methodHandles.hpp"
29
30 #define __ _masm->
31
32 #ifdef PRODUCT
33 #define BLOCK_COMMENT(str) /* nothing */
34 #define STOP(error) stop(error)
35 #else
36 #define BLOCK_COMMENT(str) __ block_comment(str)
37 #define STOP(error) block_comment(error); __ stop(error)
38 #endif
39
40 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":")
41
42 // Workaround for C++ overloading nastiness on '0' for RegisterOrConstant.
43 static RegisterOrConstant constant(int value) {
44 return RegisterOrConstant(value);
45 }
46
47 void MethodHandles::load_klass_from_Class(MacroAssembler* _masm, Register klass_reg, Register temp_reg, Register temp2_reg) {
48 if (VerifyMethodHandles)
49 verify_klass(_masm, klass_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_Class), temp_reg, temp2_reg,
50 "MH argument is a Class");
51 __ ld_ptr(Address(klass_reg, java_lang_Class::klass_offset_in_bytes()), klass_reg);
52 }
53
54 #ifdef ASSERT
55 static int check_nonzero(const char* xname, int x) {
56 assert(x != 0, err_msg("%s should be nonzero", xname));
57 return x;
58 }
59 #define NONZERO(x) check_nonzero(#x, x)
60 #else //ASSERT
61 #define NONZERO(x) (x)
62 #endif //ASSERT
63
64 #ifdef ASSERT
65 void MethodHandles::verify_klass(MacroAssembler* _masm,
66 Register obj_reg, SystemDictionary::WKID klass_id,
67 Register temp_reg, Register temp2_reg,
68 const char* error_message) {
69 Klass** klass_addr = SystemDictionary::well_known_klass_addr(klass_id);
70 KlassHandle klass = SystemDictionary::well_known_klass(klass_id);
71 bool did_save = false;
72 if (temp_reg == noreg || temp2_reg == noreg) {
73 temp_reg = L1;
74 temp2_reg = L2;
75 __ save_frame_and_mov(0, obj_reg, L0);
76 obj_reg = L0;
77 did_save = true;
78 }
79 Label L_ok, L_bad;
80 BLOCK_COMMENT("verify_klass {");
81 __ verify_oop(obj_reg);
82 __ br_null_short(obj_reg, Assembler::pn, L_bad);
83 __ load_klass(obj_reg, temp_reg);
84 __ set(ExternalAddress((Metadata**)klass_addr), temp2_reg);
85 __ ld_ptr(Address(temp2_reg, 0), temp2_reg);
86 __ cmp_and_brx_short(temp_reg, temp2_reg, Assembler::equal, Assembler::pt, L_ok);
87 intptr_t super_check_offset = klass->super_check_offset();
88 __ ld_ptr(Address(temp_reg, super_check_offset), temp_reg);
89 __ set(ExternalAddress((Metadata**)klass_addr), temp2_reg);
90 __ ld_ptr(Address(temp2_reg, 0), temp2_reg);
91 __ cmp_and_brx_short(temp_reg, temp2_reg, Assembler::equal, Assembler::pt, L_ok);
92 __ BIND(L_bad);
93 if (did_save) __ restore();
94 __ STOP(error_message);
95 __ BIND(L_ok);
96 if (did_save) __ restore();
97 BLOCK_COMMENT("} verify_klass");
98 }
99
100 void MethodHandles::verify_ref_kind(MacroAssembler* _masm, int ref_kind, Register member_reg, Register temp) {
101 Label L;
102 BLOCK_COMMENT("verify_ref_kind {");
103 __ lduw(Address(member_reg, NONZERO(java_lang_invoke_MemberName::flags_offset_in_bytes())), temp);
104 __ srl( temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT, temp);
105 __ and3(temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK, temp);
106 __ cmp_and_br_short(temp, ref_kind, Assembler::equal, Assembler::pt, L);
107 { char* buf = NEW_C_HEAP_ARRAY(char, 100, mtInternal);
108 jio_snprintf(buf, 100, "verify_ref_kind expected %x", ref_kind);
109 if (ref_kind == JVM_REF_invokeVirtual ||
110 ref_kind == JVM_REF_invokeSpecial)
111 // could do this for all ref_kinds, but would explode assembly code size
112 trace_method_handle(_masm, buf);
113 __ STOP(buf);
114 }
115 BLOCK_COMMENT("} verify_ref_kind");
116 __ bind(L);
117 }
118
119 #endif // ASSERT
120
121 void MethodHandles::jump_from_method_handle(MacroAssembler* _masm, Register method, Register target, Register temp,
122 bool for_compiler_entry) {
123 assert(method == G5_method, "interpreter calling convention");
124 assert_different_registers(method, target, temp);
125
126 if (!for_compiler_entry && JvmtiExport::can_post_interpreter_events()) {
127 Label run_compiled_code;
128 // JVMTI events, such as single-stepping, are implemented partly by avoiding running
129 // compiled code in threads for which the event is enabled. Check here for
130 // interp_only_mode if these events CAN be enabled.
131 __ verify_thread();
132 const Address interp_only(G2_thread, JavaThread::interp_only_mode_offset());
133 __ ld(interp_only, temp);
134 __ cmp_and_br_short(temp, 0, Assembler::zero, Assembler::pt, run_compiled_code);
135 __ ld_ptr(G5_method, in_bytes(Method::interpreter_entry_offset()), target);
136 __ jmp(target, 0);
137 __ delayed()->nop();
138 __ BIND(run_compiled_code);
139 // Note: we could fill some delay slots here, but
140 // it doesn't matter, since this is interpreter code.
141 }
142
143 const ByteSize entry_offset = for_compiler_entry ? Method::from_compiled_offset() :
144 Method::from_interpreted_offset();
145 __ ld_ptr(G5_method, in_bytes(entry_offset), target);
146 __ jmp(target, 0);
147 __ delayed()->nop();
148 }
149
150 void MethodHandles::jump_to_lambda_form(MacroAssembler* _masm,
151 Register recv, Register method_temp,
152 Register temp2, Register temp3,
153 bool for_compiler_entry) {
154 BLOCK_COMMENT("jump_to_lambda_form {");
155 // This is the initial entry point of a lazy method handle.
156 // After type checking, it picks up the invoker from the LambdaForm.
157 assert_different_registers(recv, method_temp, temp2); // temp3 is only passed on
158 assert(method_temp == G5_method, "required register for loading method");
159
160 //NOT_PRODUCT({ FlagSetting fs(TraceMethodHandles, true); trace_method_handle(_masm, "LZMH"); });
161
162 // Load the invoker, as MH -> MH.form -> LF.vmentry
163 __ verify_oop(recv);
164 __ load_heap_oop(Address(recv, NONZERO(java_lang_invoke_MethodHandle::form_offset_in_bytes())), method_temp);
165 __ verify_oop(method_temp);
166 __ load_heap_oop(Address(method_temp, NONZERO(java_lang_invoke_LambdaForm::vmentry_offset_in_bytes())), method_temp);
167 __ verify_oop(method_temp);
168 // the following assumes that a Method* is normally compressed in the vmtarget field:
169 __ ld_ptr( Address(method_temp, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes())), method_temp);
170
171 if (VerifyMethodHandles && !for_compiler_entry) {
172 // make sure recv is already on stack
173 __ load_sized_value(Address(method_temp, Method::size_of_parameters_offset()),
174 temp2,
175 sizeof(u2), /*is_signed*/ false);
176 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), "");
177 Label L;
178 __ ld_ptr(__ argument_address(temp2, temp2, -1), temp2);
179 __ cmp_and_br_short(temp2, recv, Assembler::equal, Assembler::pt, L);
180 __ STOP("receiver not on stack");
181 __ BIND(L);
182 }
183
184 jump_from_method_handle(_masm, method_temp, temp2, temp3, for_compiler_entry);
185 BLOCK_COMMENT("} jump_to_lambda_form");
186 }
187
188
189 // Code generation
190 address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm,
191 vmIntrinsics::ID iid) {
192 const bool not_for_compiler_entry = false; // this is the interpreter entry
193 assert(is_signature_polymorphic(iid), "expected invoke iid");
194 if (iid == vmIntrinsics::_invokeGeneric ||
195 iid == vmIntrinsics::_compiledLambdaForm) {
196 // Perhaps surprisingly, the symbolic references visible to Java are not directly used.
197 // They are linked to Java-generated adapters via MethodHandleNatives.linkMethod.
198 // They all allow an appendix argument.
199 __ should_not_reach_here(); // empty stubs make SG sick
200 return NULL;
201 }
202
203 // I5_savedSP/O5_savedSP: sender SP (must preserve; see prepare_to_jump_from_interpreted)
204 // G5_method: Method*
205 // G4 (Gargs): incoming argument list (must preserve)
206 // O0: used as temp to hold mh or receiver
207 // O1, O4: garbage temps, blown away
208 Register O1_scratch = O1;
209 Register O4_param_size = O4; // size of parameters
210
211 // here's where control starts out:
212 __ align(CodeEntryAlignment);
213 address entry_point = __ pc();
214
215 if (VerifyMethodHandles) {
216 Label L;
217 BLOCK_COMMENT("verify_intrinsic_id {");
218 __ ldub(Address(G5_method, Method::intrinsic_id_offset_in_bytes()), O1_scratch);
219 __ cmp_and_br_short(O1_scratch, (int) iid, Assembler::equal, Assembler::pt, L);
220 if (iid == vmIntrinsics::_linkToVirtual ||
221 iid == vmIntrinsics::_linkToSpecial) {
222 // could do this for all kinds, but would explode assembly code size
223 trace_method_handle(_masm, "bad Method*::intrinsic_id");
224 }
225 __ STOP("bad Method*::intrinsic_id");
226 __ bind(L);
227 BLOCK_COMMENT("} verify_intrinsic_id");
228 }
229
230 // First task: Find out how big the argument list is.
231 Address O4_first_arg_addr;
232 int ref_kind = signature_polymorphic_intrinsic_ref_kind(iid);
233 assert(ref_kind != 0 || iid == vmIntrinsics::_invokeBasic, "must be _invokeBasic or a linkTo intrinsic");
234 if (ref_kind == 0 || MethodHandles::ref_kind_has_receiver(ref_kind)) {
235 __ load_sized_value(Address(G5_method, Method::size_of_parameters_offset()),
236 O4_param_size,
237 sizeof(u2), /*is_signed*/ false);
238 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), "");
239 O4_first_arg_addr = __ argument_address(O4_param_size, O4_param_size, -1);
240 } else {
241 DEBUG_ONLY(O4_param_size = noreg);
242 }
243
244 Register O0_mh = noreg;
245 if (!is_signature_polymorphic_static(iid)) {
246 __ ld_ptr(O4_first_arg_addr, O0_mh = O0);
247 DEBUG_ONLY(O4_param_size = noreg);
248 }
249
250 // O4_first_arg_addr is live!
251
252 if (TraceMethodHandles) {
253 if (O0_mh != noreg)
254 __ mov(O0_mh, G3_method_handle); // make stub happy
255 trace_method_handle_interpreter_entry(_masm, iid);
256 }
257
258 if (iid == vmIntrinsics::_invokeBasic) {
259 generate_method_handle_dispatch(_masm, iid, O0_mh, noreg, not_for_compiler_entry);
260
261 } else {
262 // Adjust argument list by popping the trailing MemberName argument.
263 Register O0_recv = noreg;
264 if (MethodHandles::ref_kind_has_receiver(ref_kind)) {
265 // Load the receiver (not the MH; the actual MemberName's receiver) up from the interpreter stack.
266 __ ld_ptr(O4_first_arg_addr, O0_recv = O0);
267 DEBUG_ONLY(O4_param_size = noreg);
268 }
269 Register G5_member = G5_method; // MemberName ptr; incoming method ptr is dead now
270 __ ld_ptr(__ argument_address(constant(0)), G5_member);
271 __ add(Gargs, Interpreter::stackElementSize, Gargs);
272 generate_method_handle_dispatch(_masm, iid, O0_recv, G5_member, not_for_compiler_entry);
273 }
274
275 return entry_point;
276 }
277
278 void MethodHandles::generate_method_handle_dispatch(MacroAssembler* _masm,
279 vmIntrinsics::ID iid,
280 Register receiver_reg,
281 Register member_reg,
282 bool for_compiler_entry) {
283 assert(is_signature_polymorphic(iid), "expected invoke iid");
284 Register temp1 = (for_compiler_entry ? G1_scratch : O1);
285 Register temp2 = (for_compiler_entry ? G3_scratch : O2);
286 Register temp3 = (for_compiler_entry ? G4_scratch : O3);
287 Register temp4 = (for_compiler_entry ? noreg : O4);
288 if (for_compiler_entry) {
289 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : O0), "only valid assignment");
290 assert_different_registers(temp1, O0, O1, O2, O3, O4, O5);
291 assert_different_registers(temp2, O0, O1, O2, O3, O4, O5);
292 assert_different_registers(temp3, O0, O1, O2, O3, O4, O5);
293 assert_different_registers(temp4, O0, O1, O2, O3, O4, O5);
294 } else {
295 assert_different_registers(temp1, temp2, temp3, temp4, O5_savedSP); // don't trash lastSP
296 }
297 if (receiver_reg != noreg) assert_different_registers(temp1, temp2, temp3, temp4, receiver_reg);
298 if (member_reg != noreg) assert_different_registers(temp1, temp2, temp3, temp4, member_reg);
299
300 if (iid == vmIntrinsics::_invokeBasic) {
301 // indirect through MH.form.vmentry.vmtarget
302 jump_to_lambda_form(_masm, receiver_reg, G5_method, temp1, temp2, for_compiler_entry);
303
304 } else {
305 // The method is a member invoker used by direct method handles.
306 if (VerifyMethodHandles) {
307 // make sure the trailing argument really is a MemberName (caller responsibility)
308 verify_klass(_masm, member_reg, SystemDictionary::WK_KLASS_ENUM_NAME(MemberName_klass),
309 temp1, temp2,
310 "MemberName required for invokeVirtual etc.");
311 }
312
313 Address member_clazz( member_reg, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes()));
314 Address member_vmindex( member_reg, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes()));
315 Address member_vmtarget( member_reg, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes()));
316
317 Register temp1_recv_klass = temp1;
318 if (iid != vmIntrinsics::_linkToStatic) {
319 __ verify_oop(receiver_reg);
320 if (iid == vmIntrinsics::_linkToSpecial) {
321 // Don't actually load the klass; just null-check the receiver.
322 __ null_check(receiver_reg);
323 } else {
324 // load receiver klass itself
325 __ null_check(receiver_reg, oopDesc::klass_offset_in_bytes());
326 __ load_klass(receiver_reg, temp1_recv_klass);
327 __ verify_klass_ptr(temp1_recv_klass);
328 }
329 BLOCK_COMMENT("check_receiver {");
330 // The receiver for the MemberName must be in receiver_reg.
331 // Check the receiver against the MemberName.clazz
332 if (VerifyMethodHandles && iid == vmIntrinsics::_linkToSpecial) {
333 // Did not load it above...
334 __ load_klass(receiver_reg, temp1_recv_klass);
335 __ verify_klass_ptr(temp1_recv_klass);
336 }
337 if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) {
338 Label L_ok;
339 Register temp2_defc = temp2;
340 __ load_heap_oop(member_clazz, temp2_defc);
341 load_klass_from_Class(_masm, temp2_defc, temp3, temp4);
342 __ verify_klass_ptr(temp2_defc);
343 __ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, temp4, L_ok);
344 // If we get here, the type check failed!
345 __ STOP("receiver class disagrees with MemberName.clazz");
346 __ bind(L_ok);
347 }
348 BLOCK_COMMENT("} check_receiver");
349 }
350 if (iid == vmIntrinsics::_linkToSpecial ||
351 iid == vmIntrinsics::_linkToStatic) {
352 DEBUG_ONLY(temp1_recv_klass = noreg); // these guys didn't load the recv_klass
353 }
354
355 // Live registers at this point:
356 // member_reg - MemberName that was the trailing argument
357 // temp1_recv_klass - klass of stacked receiver, if needed
358 // O5_savedSP - interpreter linkage (if interpreted)
359 // O0..O5 - compiler arguments (if compiled)
360
361 Label L_incompatible_class_change_error;
362 switch (iid) {
363 case vmIntrinsics::_linkToSpecial:
364 if (VerifyMethodHandles) {
365 verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp2);
366 }
367 __ ld_ptr(member_vmtarget, G5_method);
368 break;
369
370 case vmIntrinsics::_linkToStatic:
371 if (VerifyMethodHandles) {
372 verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp2);
373 }
374 __ ld_ptr(member_vmtarget, G5_method);
375 break;
376
377 case vmIntrinsics::_linkToVirtual:
378 {
379 // same as TemplateTable::invokevirtual,
380 // minus the CP setup and profiling:
381
382 if (VerifyMethodHandles) {
383 verify_ref_kind(_masm, JVM_REF_invokeVirtual, member_reg, temp2);
384 }
385
386 // pick out the vtable index from the MemberName, and then we can discard it:
387 Register temp2_index = temp2;
388 __ ld_ptr(member_vmindex, temp2_index);
389
390 if (VerifyMethodHandles) {
391 Label L_index_ok;
392 __ cmp_and_br_short(temp2_index, (int) 0, Assembler::greaterEqual, Assembler::pn, L_index_ok);
393 __ STOP("no virtual index");
394 __ BIND(L_index_ok);
395 }
396
397 // Note: The verifier invariants allow us to ignore MemberName.clazz and vmtarget
398 // at this point. And VerifyMethodHandles has already checked clazz, if needed.
399
400 // get target Method* & entry point
401 __ lookup_virtual_method(temp1_recv_klass, temp2_index, G5_method);
402 break;
403 }
404
405 case vmIntrinsics::_linkToInterface:
406 {
407 // same as TemplateTable::invokeinterface
408 // (minus the CP setup and profiling, with different argument motion)
409 if (VerifyMethodHandles) {
410 verify_ref_kind(_masm, JVM_REF_invokeInterface, member_reg, temp2);
411 }
412
413 Register temp2_intf = temp2;
414 __ load_heap_oop(member_clazz, temp2_intf);
415 load_klass_from_Class(_masm, temp2_intf, temp3, temp4);
416 __ verify_klass_ptr(temp2_intf);
417
418 Register G5_index = G5_method;
419 __ ld_ptr(member_vmindex, G5_index);
420 if (VerifyMethodHandles) {
421 Label L;
422 __ cmp_and_br_short(G5_index, 0, Assembler::greaterEqual, Assembler::pt, L);
423 __ STOP("invalid vtable index for MH.invokeInterface");
424 __ bind(L);
425 }
426
427 // given intf, index, and recv klass, dispatch to the implementation method
428 __ lookup_interface_method(temp1_recv_klass, temp2_intf,
429 // note: next two args must be the same:
430 G5_index, G5_method,
431 temp3, temp4,
432 L_incompatible_class_change_error);
433 break;
434 }
435
436 default:
437 fatal(err_msg_res("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid)));
438 break;
439 }
440
441 // Live at this point:
442 // G5_method
443 // O5_savedSP (if interpreted)
444
445 // After figuring out which concrete method to call, jump into it.
446 // Note that this works in the interpreter with no data motion.
447 // But the compiled version will require that rcx_recv be shifted out.
448 __ verify_method_ptr(G5_method);
449 jump_from_method_handle(_masm, G5_method, temp1, temp2, for_compiler_entry);
450
451 if (iid == vmIntrinsics::_linkToInterface) {
452 __ BIND(L_incompatible_class_change_error);
453 AddressLiteral icce(StubRoutines::throw_IncompatibleClassChangeError_entry());
454 __ jump_to(icce, temp1);
455 __ delayed()->nop();
456 }
457 }
458 }
459
460 #ifndef PRODUCT
461 void trace_method_handle_stub(const char* adaptername,
462 oopDesc* mh,
463 intptr_t* saved_sp,
464 intptr_t* args,
465 intptr_t* tracing_fp) {
466 bool has_mh = (strstr(adaptername, "/static") == NULL &&
467 strstr(adaptername, "linkTo") == NULL); // static linkers don't have MH
468 const char* mh_reg_name = has_mh ? "G3_mh" : "G3";
469 tty->print_cr("MH %s %s="INTPTR_FORMAT " saved_sp=" INTPTR_FORMAT " args=" INTPTR_FORMAT,
470 adaptername, mh_reg_name,
471 (intptr_t) mh, saved_sp, args);
472
473 if (Verbose) {
474 // dumping last frame with frame::describe
475
476 JavaThread* p = JavaThread::active();
477
478 ResourceMark rm;
479 PRESERVE_EXCEPTION_MARK; // may not be needed by safer and unexpensive here
480 FrameValues values;
481
482 // Note: We want to allow trace_method_handle from any call site.
483 // While trace_method_handle creates a frame, it may be entered
484 // without a valid return PC in O7 (e.g. not just after a call).
485 // Walking that frame could lead to failures due to that invalid PC.
486 // => carefully detect that frame when doing the stack walking
487
488 // walk up to the right frame using the "tracing_fp" argument
489 intptr_t* cur_sp = StubRoutines::Sparc::flush_callers_register_windows_func()();
490 frame cur_frame(cur_sp, frame::unpatchable, NULL);
491
492 while (cur_frame.fp() != (intptr_t *)(STACK_BIAS+(uintptr_t)tracing_fp)) {
493 cur_frame = os::get_sender_for_C_frame(&cur_frame);
494 }
495
496 // safely create a frame and call frame::describe
497 intptr_t *dump_sp = cur_frame.sender_sp();
498 intptr_t *dump_fp = cur_frame.link();
499
500 bool walkable = has_mh; // whether the traced frame shoud be walkable
501
502 // the sender for cur_frame is the caller of trace_method_handle
503 if (walkable) {
504 // The previous definition of walkable may have to be refined
505 // if new call sites cause the next frame constructor to start
506 // failing. Alternatively, frame constructors could be
507 // modified to support the current or future non walkable
508 // frames (but this is more intrusive and is not considered as
509 // part of this RFE, which will instead use a simpler output).
510 frame dump_frame = frame(dump_sp,
511 cur_frame.sp(), // younger_sp
512 false); // no adaptation
513 dump_frame.describe(values, 1);
514 } else {
515 // Robust dump for frames which cannot be constructed from sp/younger_sp
516 // Add descriptions without building a Java frame to avoid issues
517 values.describe(-1, dump_fp, "fp for #1 <not parsed, cannot trust pc>");
518 values.describe(-1, dump_sp, "sp");
519 }
520
521 bool has_args = has_mh; // whether Gargs is meaningful
522
523 // mark args, if seems valid (may not be valid for some adapters)
524 if (has_args) {
525 if ((args >= dump_sp) && (args < dump_fp)) {
526 values.describe(-1, args, "*G4_args");
527 }
528 }
529
530 // mark saved_sp, if seems valid (may not be valid for some adapters)
531 intptr_t *unbiased_sp = (intptr_t *)(STACK_BIAS+(uintptr_t)saved_sp);
532 const int ARG_LIMIT = 255, SLOP = 45, UNREASONABLE_STACK_MOVE = (ARG_LIMIT + SLOP);
533 if ((unbiased_sp >= dump_sp - UNREASONABLE_STACK_MOVE) && (unbiased_sp < dump_fp)) {
534 values.describe(-1, unbiased_sp, "*saved_sp+STACK_BIAS");
535 }
536
537 // Note: the unextended_sp may not be correct
538 tty->print_cr(" stack layout:");
539 values.print(p);
540 if (has_mh && mh->is_oop()) {
541 mh->print();
542 if (java_lang_invoke_MethodHandle::is_instance(mh)) {
543 if (java_lang_invoke_MethodHandle::form_offset_in_bytes() != 0)
544 java_lang_invoke_MethodHandle::form(mh)->print();
545 }
546 }
547 }
548 }
549
550 void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) {
551 if (!TraceMethodHandles) return;
552 BLOCK_COMMENT("trace_method_handle {");
553 // save: Gargs, O5_savedSP
554 __ save_frame(16); // need space for saving required FPU state
555
556 __ set((intptr_t) adaptername, O0);
557 __ mov(G3_method_handle, O1);
558 __ mov(I5_savedSP, O2);
559 __ mov(Gargs, O3);
560 __ mov(I6, O4); // frame identifier for safe stack walking
561
562 // Save scratched registers that might be needed. Robustness is more
563 // important than optimizing the saves for this debug only code.
564
565 // save FP result, valid at some call sites (adapter_opt_return_float, ...)
566 Address d_save(FP, -sizeof(jdouble) + STACK_BIAS);
567 __ stf(FloatRegisterImpl::D, Ftos_d, d_save);
568 // Safely save all globals but G2 (handled by call_VM_leaf) and G7
569 // (OS reserved).
570 __ mov(G3_method_handle, L3);
571 __ mov(Gargs, L4);
572 __ mov(G5_method_type, L5);
573 __ mov(G6, L6);
574 __ mov(G1, L1);
575
576 __ call_VM_leaf(L2 /* for G2 */, CAST_FROM_FN_PTR(address, trace_method_handle_stub));
577
578 __ mov(L3, G3_method_handle);
579 __ mov(L4, Gargs);
580 __ mov(L5, G5_method_type);
581 __ mov(L6, G6);
582 __ mov(L1, G1);
583 __ ldf(FloatRegisterImpl::D, d_save, Ftos_d);
584
585 __ restore();
586 BLOCK_COMMENT("} trace_method_handle");
587 }
588 #endif // PRODUCT