1 /*
2 * Copyright (c) 2008, 2013, 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 Label L_no_such_method;
125 assert(method == G5_method, "interpreter calling convention");
126 assert_different_registers(method, target, temp);
127
128 if (!for_compiler_entry && JvmtiExport::can_post_interpreter_events()) {
129 Label run_compiled_code;
130 // JVMTI events, such as single-stepping, are implemented partly by avoiding running
131 // compiled code in threads for which the event is enabled. Check here for
132 // interp_only_mode if these events CAN be enabled.
133 __ verify_thread();
134 const Address interp_only(G2_thread, JavaThread::interp_only_mode_offset());
135 __ ld(interp_only, temp);
136 __ cmp_and_br_short(temp, 0, Assembler::zero, Assembler::pt, run_compiled_code);
137 // Null method test is replicated below in compiled case,
138 // it might be able to address across the verify_thread()
139 __ br_null_short(G5_method, Assembler::pn, L_no_such_method);
140 __ ld_ptr(G5_method, in_bytes(Method::interpreter_entry_offset()), target);
141 __ jmp(target, 0);
142 __ delayed()->nop();
143 __ BIND(run_compiled_code);
144 // Note: we could fill some delay slots here, but
145 // it doesn't matter, since this is interpreter code.
146 }
147
148 // Compiled case, either static or fall-through from runtime conditional
149 __ br_null_short(G5_method, Assembler::pn, L_no_such_method);
150
151 const ByteSize entry_offset = for_compiler_entry ? Method::from_compiled_offset() :
152 Method::from_interpreted_offset();
153 __ ld_ptr(G5_method, in_bytes(entry_offset), target);
154 __ jmp(target, 0);
155 __ delayed()->nop();
156
157 __ bind(L_no_such_method);
158 AddressLiteral ame(StubRoutines::throw_AbstractMethodError_entry());
159 __ jump_to(ame, temp);
160 __ delayed()->nop();
161 }
162
163 void MethodHandles::jump_to_lambda_form(MacroAssembler* _masm,
164 Register recv, Register method_temp,
165 Register temp2, Register temp3,
166 bool for_compiler_entry) {
167 BLOCK_COMMENT("jump_to_lambda_form {");
168 // This is the initial entry point of a lazy method handle.
169 // After type checking, it picks up the invoker from the LambdaForm.
170 assert_different_registers(recv, method_temp, temp2); // temp3 is only passed on
171 assert(method_temp == G5_method, "required register for loading method");
172
173 //NOT_PRODUCT({ FlagSetting fs(TraceMethodHandles, true); trace_method_handle(_masm, "LZMH"); });
174
175 // Load the invoker, as MH -> MH.form -> LF.vmentry
176 __ verify_oop(recv);
177 __ load_heap_oop(Address(recv, NONZERO(java_lang_invoke_MethodHandle::form_offset_in_bytes())), method_temp);
178 __ verify_oop(method_temp);
179 __ load_heap_oop(Address(method_temp, NONZERO(java_lang_invoke_LambdaForm::vmentry_offset_in_bytes())), method_temp);
180 __ verify_oop(method_temp);
181 // the following assumes that a Method* is normally compressed in the vmtarget field:
182 __ ld_ptr( Address(method_temp, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes())), method_temp);
183
184 if (VerifyMethodHandles && !for_compiler_entry) {
185 // make sure recv is already on stack
186 __ ld_ptr(method_temp, in_bytes(Method::const_offset()), temp2);
187 __ load_sized_value(Address(temp2, ConstMethod::size_of_parameters_offset()),
188 temp2,
189 sizeof(u2), /*is_signed*/ false);
190 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), "");
191 Label L;
192 __ ld_ptr(__ argument_address(temp2, temp2, -1), temp2);
193 __ cmp_and_br_short(temp2, recv, Assembler::equal, Assembler::pt, L);
194 __ STOP("receiver not on stack");
195 __ BIND(L);
196 }
197
198 jump_from_method_handle(_masm, method_temp, temp2, temp3, for_compiler_entry);
199 BLOCK_COMMENT("} jump_to_lambda_form");
200 }
201
202
203 // Code generation
204 address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm,
205 vmIntrinsics::ID iid) {
206 const bool not_for_compiler_entry = false; // this is the interpreter entry
207 assert(is_signature_polymorphic(iid), "expected invoke iid");
208 if (iid == vmIntrinsics::_invokeGeneric ||
209 iid == vmIntrinsics::_compiledLambdaForm) {
210 // Perhaps surprisingly, the symbolic references visible to Java are not directly used.
211 // They are linked to Java-generated adapters via MethodHandleNatives.linkMethod.
212 // They all allow an appendix argument.
213 __ should_not_reach_here(); // empty stubs make SG sick
214 return NULL;
215 }
216
217 // I5_savedSP/O5_savedSP: sender SP (must preserve; see prepare_to_jump_from_interpreted)
218 // G5_method: Method*
219 // G4 (Gargs): incoming argument list (must preserve)
220 // O0: used as temp to hold mh or receiver
221 // O1, O4: garbage temps, blown away
222 Register O1_scratch = O1;
223 Register O4_param_size = O4; // size of parameters
224
225 // here's where control starts out:
226 __ align(CodeEntryAlignment);
227 address entry_point = __ pc();
228
229 if (VerifyMethodHandles) {
230 Label L;
231 BLOCK_COMMENT("verify_intrinsic_id {");
232 __ ldub(Address(G5_method, Method::intrinsic_id_offset_in_bytes()), O1_scratch);
233 __ cmp_and_br_short(O1_scratch, (int) iid, Assembler::equal, Assembler::pt, L);
234 if (iid == vmIntrinsics::_linkToVirtual ||
235 iid == vmIntrinsics::_linkToSpecial) {
236 // could do this for all kinds, but would explode assembly code size
237 trace_method_handle(_masm, "bad Method*::intrinsic_id");
238 }
239 __ STOP("bad Method*::intrinsic_id");
240 __ bind(L);
241 BLOCK_COMMENT("} verify_intrinsic_id");
242 }
243
244 // First task: Find out how big the argument list is.
245 Address O4_first_arg_addr;
246 int ref_kind = signature_polymorphic_intrinsic_ref_kind(iid);
247 assert(ref_kind != 0 || iid == vmIntrinsics::_invokeBasic, "must be _invokeBasic or a linkTo intrinsic");
248 if (ref_kind == 0 || MethodHandles::ref_kind_has_receiver(ref_kind)) {
249 __ ld_ptr(G5_method, in_bytes(Method::const_offset()), O4_param_size);
250 __ load_sized_value(Address(O4_param_size, ConstMethod::size_of_parameters_offset()),
251 O4_param_size,
252 sizeof(u2), /*is_signed*/ false);
253 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), "");
254 O4_first_arg_addr = __ argument_address(O4_param_size, O4_param_size, -1);
255 } else {
256 DEBUG_ONLY(O4_param_size = noreg);
257 }
258
259 Register O0_mh = noreg;
260 if (!is_signature_polymorphic_static(iid)) {
261 __ ld_ptr(O4_first_arg_addr, O0_mh = O0);
262 DEBUG_ONLY(O4_param_size = noreg);
263 }
264
265 // O4_first_arg_addr is live!
266
267 if (TraceMethodHandles) {
268 if (O0_mh != noreg)
269 __ mov(O0_mh, G3_method_handle); // make stub happy
270 trace_method_handle_interpreter_entry(_masm, iid);
271 }
272
273 if (iid == vmIntrinsics::_invokeBasic) {
274 generate_method_handle_dispatch(_masm, iid, O0_mh, noreg, not_for_compiler_entry);
275
276 } else {
277 // Adjust argument list by popping the trailing MemberName argument.
278 Register O0_recv = noreg;
279 if (MethodHandles::ref_kind_has_receiver(ref_kind)) {
280 // Load the receiver (not the MH; the actual MemberName's receiver) up from the interpreter stack.
281 __ ld_ptr(O4_first_arg_addr, O0_recv = O0);
282 DEBUG_ONLY(O4_param_size = noreg);
283 }
284 Register G5_member = G5_method; // MemberName ptr; incoming method ptr is dead now
285 __ ld_ptr(__ argument_address(constant(0)), G5_member);
286 __ add(Gargs, Interpreter::stackElementSize, Gargs);
287 generate_method_handle_dispatch(_masm, iid, O0_recv, G5_member, not_for_compiler_entry);
288 }
289
290 return entry_point;
291 }
292
293 void MethodHandles::generate_method_handle_dispatch(MacroAssembler* _masm,
294 vmIntrinsics::ID iid,
295 Register receiver_reg,
296 Register member_reg,
297 bool for_compiler_entry) {
298 assert(is_signature_polymorphic(iid), "expected invoke iid");
299 Register temp1 = (for_compiler_entry ? G1_scratch : O1);
300 Register temp2 = (for_compiler_entry ? G3_scratch : O2);
301 Register temp3 = (for_compiler_entry ? G4_scratch : O3);
302 Register temp4 = (for_compiler_entry ? noreg : O4);
303 if (for_compiler_entry) {
304 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : O0), "only valid assignment");
305 assert_different_registers(temp1, O0, O1, O2, O3, O4, O5);
306 assert_different_registers(temp2, O0, O1, O2, O3, O4, O5);
307 assert_different_registers(temp3, O0, O1, O2, O3, O4, O5);
308 assert_different_registers(temp4, O0, O1, O2, O3, O4, O5);
309 } else {
310 assert_different_registers(temp1, temp2, temp3, temp4, O5_savedSP); // don't trash lastSP
311 }
312 if (receiver_reg != noreg) assert_different_registers(temp1, temp2, temp3, temp4, receiver_reg);
313 if (member_reg != noreg) assert_different_registers(temp1, temp2, temp3, temp4, member_reg);
314
315 if (iid == vmIntrinsics::_invokeBasic) {
316 // indirect through MH.form.vmentry.vmtarget
317 jump_to_lambda_form(_masm, receiver_reg, G5_method, temp1, temp2, for_compiler_entry);
318
319 } else {
320 // The method is a member invoker used by direct method handles.
321 if (VerifyMethodHandles) {
322 // make sure the trailing argument really is a MemberName (caller responsibility)
323 verify_klass(_masm, member_reg, SystemDictionary::WK_KLASS_ENUM_NAME(MemberName_klass),
324 temp1, temp2,
325 "MemberName required for invokeVirtual etc.");
326 }
327
328 Address member_clazz( member_reg, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes()));
329 Address member_vmindex( member_reg, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes()));
330 Address member_vmtarget( member_reg, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes()));
331
332 Register temp1_recv_klass = temp1;
333 if (iid != vmIntrinsics::_linkToStatic) {
334 __ verify_oop(receiver_reg);
335 if (iid == vmIntrinsics::_linkToSpecial) {
336 // Don't actually load the klass; just null-check the receiver.
337 __ null_check(receiver_reg);
338 } else {
339 // load receiver klass itself
340 __ null_check(receiver_reg, oopDesc::klass_offset_in_bytes());
341 __ load_klass(receiver_reg, temp1_recv_klass);
342 __ verify_klass_ptr(temp1_recv_klass);
343 }
344 BLOCK_COMMENT("check_receiver {");
345 // The receiver for the MemberName must be in receiver_reg.
346 // Check the receiver against the MemberName.clazz
347 if (VerifyMethodHandles && iid == vmIntrinsics::_linkToSpecial) {
348 // Did not load it above...
349 __ load_klass(receiver_reg, temp1_recv_klass);
350 __ verify_klass_ptr(temp1_recv_klass);
351 }
352 if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) {
353 Label L_ok;
354 Register temp2_defc = temp2;
355 __ load_heap_oop(member_clazz, temp2_defc);
356 load_klass_from_Class(_masm, temp2_defc, temp3, temp4);
357 __ verify_klass_ptr(temp2_defc);
358 __ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, temp4, L_ok);
359 // If we get here, the type check failed!
360 __ STOP("receiver class disagrees with MemberName.clazz");
361 __ bind(L_ok);
362 }
363 BLOCK_COMMENT("} check_receiver");
364 }
365 if (iid == vmIntrinsics::_linkToSpecial ||
366 iid == vmIntrinsics::_linkToStatic) {
367 DEBUG_ONLY(temp1_recv_klass = noreg); // these guys didn't load the recv_klass
368 }
369
370 // Live registers at this point:
371 // member_reg - MemberName that was the trailing argument
372 // temp1_recv_klass - klass of stacked receiver, if needed
373 // O5_savedSP - interpreter linkage (if interpreted)
374 // O0..O5 - compiler arguments (if compiled)
375
376 Label L_incompatible_class_change_error;
377 switch (iid) {
378 case vmIntrinsics::_linkToSpecial:
379 if (VerifyMethodHandles) {
380 verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp2);
381 }
382 __ ld_ptr(member_vmtarget, G5_method);
383 break;
384
385 case vmIntrinsics::_linkToStatic:
386 if (VerifyMethodHandles) {
387 verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp2);
388 }
389 __ ld_ptr(member_vmtarget, G5_method);
390 break;
391
392 case vmIntrinsics::_linkToVirtual:
393 {
394 // same as TemplateTable::invokevirtual,
395 // minus the CP setup and profiling:
396
397 if (VerifyMethodHandles) {
398 verify_ref_kind(_masm, JVM_REF_invokeVirtual, member_reg, temp2);
399 }
400
401 // pick out the vtable index from the MemberName, and then we can discard it:
402 Register temp2_index = temp2;
403 __ ld_ptr(member_vmindex, temp2_index);
404
405 if (VerifyMethodHandles) {
406 Label L_index_ok;
407 __ cmp_and_br_short(temp2_index, (int) 0, Assembler::greaterEqual, Assembler::pn, L_index_ok);
408 __ STOP("no virtual index");
409 __ BIND(L_index_ok);
410 }
411
412 // Note: The verifier invariants allow us to ignore MemberName.clazz and vmtarget
413 // at this point. And VerifyMethodHandles has already checked clazz, if needed.
414
415 // get target Method* & entry point
416 __ lookup_virtual_method(temp1_recv_klass, temp2_index, G5_method);
417 break;
418 }
419
420 case vmIntrinsics::_linkToInterface:
421 {
422 // same as TemplateTable::invokeinterface
423 // (minus the CP setup and profiling, with different argument motion)
424 if (VerifyMethodHandles) {
425 verify_ref_kind(_masm, JVM_REF_invokeInterface, member_reg, temp2);
426 }
427
428 Register temp2_intf = temp2;
429 __ load_heap_oop(member_clazz, temp2_intf);
430 load_klass_from_Class(_masm, temp2_intf, temp3, temp4);
431 __ verify_klass_ptr(temp2_intf);
432
433 Register G5_index = G5_method;
434 __ ld_ptr(member_vmindex, G5_index);
435 if (VerifyMethodHandles) {
436 Label L;
437 __ cmp_and_br_short(G5_index, 0, Assembler::greaterEqual, Assembler::pt, L);
438 __ STOP("invalid vtable index for MH.invokeInterface");
439 __ bind(L);
440 }
441
442 // given intf, index, and recv klass, dispatch to the implementation method
443 __ lookup_interface_method(temp1_recv_klass, temp2_intf,
444 // note: next two args must be the same:
445 G5_index, G5_method,
446 temp3, temp4,
447 L_incompatible_class_change_error);
448 break;
449 }
450
451 default:
452 fatal(err_msg_res("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid)));
453 break;
454 }
455
456 // Live at this point:
457 // G5_method
458 // O5_savedSP (if interpreted)
459
460 // After figuring out which concrete method to call, jump into it.
461 // Note that this works in the interpreter with no data motion.
462 // But the compiled version will require that rcx_recv be shifted out.
463 __ verify_method_ptr(G5_method);
464 jump_from_method_handle(_masm, G5_method, temp1, temp2, for_compiler_entry);
465
466 if (iid == vmIntrinsics::_linkToInterface) {
467 __ BIND(L_incompatible_class_change_error);
468 AddressLiteral icce(StubRoutines::throw_IncompatibleClassChangeError_entry());
469 __ jump_to(icce, temp1);
470 __ delayed()->nop();
471 }
472 }
473 }
474
475 #ifndef PRODUCT
476 void trace_method_handle_stub(const char* adaptername,
477 oopDesc* mh,
478 intptr_t* saved_sp,
479 intptr_t* args,
480 intptr_t* tracing_fp) {
481 bool has_mh = (strstr(adaptername, "/static") == NULL &&
482 strstr(adaptername, "linkTo") == NULL); // static linkers don't have MH
483 const char* mh_reg_name = has_mh ? "G3_mh" : "G3";
484 tty->print_cr("MH %s %s="INTPTR_FORMAT " saved_sp=" INTPTR_FORMAT " args=" INTPTR_FORMAT,
485 adaptername, mh_reg_name,
486 p2i(mh), p2i(saved_sp), p2i(args));
487
488 if (Verbose) {
489 // dumping last frame with frame::describe
490
491 JavaThread* p = JavaThread::active();
492
493 ResourceMark rm;
494 PRESERVE_EXCEPTION_MARK; // may not be needed by safer and unexpensive here
495 FrameValues values;
496
497 // Note: We want to allow trace_method_handle from any call site.
498 // While trace_method_handle creates a frame, it may be entered
499 // without a valid return PC in O7 (e.g. not just after a call).
500 // Walking that frame could lead to failures due to that invalid PC.
501 // => carefully detect that frame when doing the stack walking
502
503 // walk up to the right frame using the "tracing_fp" argument
504 intptr_t* cur_sp = StubRoutines::Sparc::flush_callers_register_windows_func()();
505 frame cur_frame(cur_sp, frame::unpatchable, NULL);
506
507 while (cur_frame.fp() != (intptr_t *)(STACK_BIAS+(uintptr_t)tracing_fp)) {
508 cur_frame = os::get_sender_for_C_frame(&cur_frame);
509 }
510
511 // safely create a frame and call frame::describe
512 intptr_t *dump_sp = cur_frame.sender_sp();
513 intptr_t *dump_fp = cur_frame.link();
514
515 bool walkable = has_mh; // whether the traced frame shoud be walkable
516
517 // the sender for cur_frame is the caller of trace_method_handle
518 if (walkable) {
519 // The previous definition of walkable may have to be refined
520 // if new call sites cause the next frame constructor to start
521 // failing. Alternatively, frame constructors could be
522 // modified to support the current or future non walkable
523 // frames (but this is more intrusive and is not considered as
524 // part of this RFE, which will instead use a simpler output).
525 frame dump_frame = frame(dump_sp,
526 cur_frame.sp(), // younger_sp
527 false); // no adaptation
528 dump_frame.describe(values, 1);
529 } else {
530 // Robust dump for frames which cannot be constructed from sp/younger_sp
531 // Add descriptions without building a Java frame to avoid issues
532 values.describe(-1, dump_fp, "fp for #1 <not parsed, cannot trust pc>");
533 values.describe(-1, dump_sp, "sp");
534 }
535
536 bool has_args = has_mh; // whether Gargs is meaningful
537
538 // mark args, if seems valid (may not be valid for some adapters)
539 if (has_args) {
540 if ((args >= dump_sp) && (args < dump_fp)) {
541 values.describe(-1, args, "*G4_args");
542 }
543 }
544
545 // mark saved_sp, if seems valid (may not be valid for some adapters)
546 intptr_t *unbiased_sp = (intptr_t *)(STACK_BIAS+(uintptr_t)saved_sp);
547 const int ARG_LIMIT = 255, SLOP = 45, UNREASONABLE_STACK_MOVE = (ARG_LIMIT + SLOP);
548 if ((unbiased_sp >= dump_sp - UNREASONABLE_STACK_MOVE) && (unbiased_sp < dump_fp)) {
549 values.describe(-1, unbiased_sp, "*saved_sp+STACK_BIAS");
550 }
551
552 // Note: the unextended_sp may not be correct
553 tty->print_cr(" stack layout:");
554 values.print(p);
555 if (has_mh && mh->is_oop()) {
556 mh->print();
557 if (java_lang_invoke_MethodHandle::is_instance(mh)) {
558 if (java_lang_invoke_MethodHandle::form_offset_in_bytes() != 0)
559 java_lang_invoke_MethodHandle::form(mh)->print();
560 }
561 }
562 }
563 }
564
565 void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) {
566 if (!TraceMethodHandles) return;
567 BLOCK_COMMENT("trace_method_handle {");
568 // save: Gargs, O5_savedSP
569 __ save_frame(16); // need space for saving required FPU state
570
571 __ set((intptr_t) adaptername, O0);
572 __ mov(G3_method_handle, O1);
573 __ mov(I5_savedSP, O2);
574 __ mov(Gargs, O3);
575 __ mov(I6, O4); // frame identifier for safe stack walking
576
577 // Save scratched registers that might be needed. Robustness is more
578 // important than optimizing the saves for this debug only code.
579
580 // save FP result, valid at some call sites (adapter_opt_return_float, ...)
581 Address d_save(FP, -sizeof(jdouble) + STACK_BIAS);
582 __ stf(FloatRegisterImpl::D, Ftos_d, d_save);
583 // Safely save all globals but G2 (handled by call_VM_leaf) and G7
584 // (OS reserved).
585 __ mov(G3_method_handle, L3);
586 __ mov(Gargs, L4);
587 __ mov(G5_method_type, L5);
588 __ mov(G6, L6);
589 __ mov(G1, L1);
590
591 __ call_VM_leaf(L2 /* for G2 */, CAST_FROM_FN_PTR(address, trace_method_handle_stub));
592
593 __ mov(L3, G3_method_handle);
594 __ mov(L4, Gargs);
595 __ mov(L5, G5_method_type);
596 __ mov(L6, G6);
597 __ mov(L1, G1);
598 __ ldf(FloatRegisterImpl::D, d_save, Ftos_d);
599
600 __ restore();
601 BLOCK_COMMENT("} trace_method_handle");
602 }
603 #endif // PRODUCT