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