1 /*
2 * Copyright (c) 1997, 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 "interpreter/interpreterRuntime.hpp"
29 #include "memory/allocation.inline.hpp"
30 #include "prims/methodHandles.hpp"
31
32 #define __ _masm->
33
34 #ifdef PRODUCT
35 #define BLOCK_COMMENT(str) /* nothing */
36 #define STOP(error) stop(error)
37 #else
38 #define BLOCK_COMMENT(str) __ block_comment(str)
39 #define STOP(error) block_comment(error); __ stop(error)
40 #endif
41
42 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":")
43
44 // Workaround for C++ overloading nastiness on '0' for RegisterOrConstant.
45 static RegisterOrConstant constant(int value) {
46 return RegisterOrConstant(value);
47 }
48
49 void MethodHandles::load_klass_from_Class(MacroAssembler* _masm, Register klass_reg) {
50 if (VerifyMethodHandles)
51 verify_klass(_masm, klass_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_Class),
52 "MH argument is a Class");
53 __ movptr(klass_reg, Address(klass_reg, java_lang_Class::klass_offset_in_bytes()));
54 }
55
56 #ifdef ASSERT
57 static int check_nonzero(const char* xname, int x) {
58 assert(x != 0, err_msg("%s should be nonzero", xname));
59 return x;
60 }
61 #define NONZERO(x) check_nonzero(#x, x)
62 #else //ASSERT
63 #define NONZERO(x) (x)
64 #endif //ASSERT
65
66 #ifdef ASSERT
67 void MethodHandles::verify_klass(MacroAssembler* _masm,
68 Register obj, SystemDictionary::WKID klass_id,
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 Register temp = rdi;
73 Register temp2 = noreg;
74 LP64_ONLY(temp2 = rscratch1); // used by MacroAssembler::cmpptr
75 Label L_ok, L_bad;
76 BLOCK_COMMENT("verify_klass {");
77 __ verify_oop(obj);
78 __ testptr(obj, obj);
79 __ jcc(Assembler::zero, L_bad);
80 __ push(temp); if (temp2 != noreg) __ push(temp2);
81 #define UNPUSH { if (temp2 != noreg) __ pop(temp2); __ pop(temp); }
82 __ load_klass(temp, obj);
83 __ cmpptr(temp, ExternalAddress((address) klass_addr));
84 __ jcc(Assembler::equal, L_ok);
85 intptr_t super_check_offset = klass->super_check_offset();
86 __ movptr(temp, Address(temp, super_check_offset));
87 __ cmpptr(temp, ExternalAddress((address) klass_addr));
88 __ jcc(Assembler::equal, L_ok);
89 UNPUSH;
90 __ bind(L_bad);
91 __ STOP(error_message);
92 __ BIND(L_ok);
93 UNPUSH;
94 BLOCK_COMMENT("} verify_klass");
95 }
96
97 void MethodHandles::verify_ref_kind(MacroAssembler* _masm, int ref_kind, Register member_reg, Register temp) {
98 Label L;
99 BLOCK_COMMENT("verify_ref_kind {");
100 __ movl(temp, Address(member_reg, NONZERO(java_lang_invoke_MemberName::flags_offset_in_bytes())));
101 __ shrl(temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT);
102 __ andl(temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK);
103 __ cmpl(temp, ref_kind);
104 __ jcc(Assembler::equal, L);
105 { char* buf = NEW_C_HEAP_ARRAY(char, 100, mtInternal);
106 jio_snprintf(buf, 100, "verify_ref_kind expected %x", ref_kind);
107 if (ref_kind == JVM_REF_invokeVirtual ||
108 ref_kind == JVM_REF_invokeSpecial)
109 // could do this for all ref_kinds, but would explode assembly code size
110 trace_method_handle(_masm, buf);
111 __ STOP(buf);
112 }
113 BLOCK_COMMENT("} verify_ref_kind");
114 __ bind(L);
115 }
116
117 #endif //ASSERT
118
119 void MethodHandles::jump_from_method_handle(MacroAssembler* _masm, Register method, Register temp,
120 bool for_compiler_entry) {
121 assert(method == rbx, "interpreter calling convention");
122 __ verify_method_ptr(method);
123
124 if (!for_compiler_entry && JvmtiExport::can_post_interpreter_events()) {
125 Label run_compiled_code;
126 // JVMTI events, such as single-stepping, are implemented partly by avoiding running
127 // compiled code in threads for which the event is enabled. Check here for
128 // interp_only_mode if these events CAN be enabled.
129 #ifdef _LP64
130 Register rthread = r15_thread;
131 #else
132 Register rthread = temp;
133 __ get_thread(rthread);
134 #endif
135 // interp_only is an int, on little endian it is sufficient to test the byte only
136 // Is a cmpl faster?
137 __ cmpb(Address(rthread, JavaThread::interp_only_mode_offset()), 0);
138 __ jccb(Assembler::zero, run_compiled_code);
139 __ jmp(Address(method, Method::interpreter_entry_offset()));
140 __ BIND(run_compiled_code);
141 }
142
143 const ByteSize entry_offset = for_compiler_entry ? Method::from_compiled_offset() :
144 Method::from_interpreted_offset();
145 __ jmp(Address(method, entry_offset));
146 }
147
148 void MethodHandles::jump_to_lambda_form(MacroAssembler* _masm,
149 Register recv, Register method_temp,
150 Register temp2,
151 bool for_compiler_entry) {
152 BLOCK_COMMENT("jump_to_lambda_form {");
153 // This is the initial entry point of a lazy method handle.
154 // After type checking, it picks up the invoker from the LambdaForm.
155 assert_different_registers(recv, method_temp, temp2);
156 assert(recv != noreg, "required register");
157 assert(method_temp == rbx, "required register for loading method");
158
159 //NOT_PRODUCT({ FlagSetting fs(TraceMethodHandles, true); trace_method_handle(_masm, "LZMH"); });
160
161 // Load the invoker, as MH -> MH.form -> LF.vmentry
162 __ verify_oop(recv);
163 __ load_heap_oop(method_temp, Address(recv, NONZERO(java_lang_invoke_MethodHandle::form_offset_in_bytes())));
164 __ verify_oop(method_temp);
165 __ load_heap_oop(method_temp, Address(method_temp, NONZERO(java_lang_invoke_LambdaForm::vmentry_offset_in_bytes())));
166 __ verify_oop(method_temp);
167 // the following assumes that a Method* is normally compressed in the vmtarget field:
168 __ movptr(method_temp, Address(method_temp, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes())));
169
170 if (VerifyMethodHandles && !for_compiler_entry) {
171 // make sure recv is already on stack
172 __ movptr(temp2, Address(method_temp, Method::const_offset()));
173 __ load_sized_value(temp2,
174 Address(temp2, ConstMethod::size_of_parameters_offset()),
175 sizeof(u2), /*is_signed*/ false);
176 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), "");
177 Label L;
178 __ cmpptr(recv, __ argument_address(temp2, -1));
179 __ jcc(Assembler::equal, L);
180 __ movptr(rax, __ argument_address(temp2, -1));
181 __ STOP("receiver not on stack");
182 __ BIND(L);
183 }
184
185 jump_from_method_handle(_masm, method_temp, temp2, 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 __ hlt(); // empty stubs make SG sick
201 return NULL;
202 }
203
204 // rsi/r13: sender SP (must preserve; see prepare_to_jump_from_interpreted)
205 // rbx: Method*
206 // rdx: argument locator (parameter slot count, added to rsp)
207 // rcx: used as temp to hold mh or receiver
208 // rax, rdi: garbage temps, blown away
209 Register rdx_argp = rdx; // argument list ptr, live on error paths
210 Register rax_temp = rax;
211 Register rcx_mh = rcx; // MH receiver; dies quickly and is recycled
212 Register rbx_method = rbx; // eventual target of this invocation
213
214 // here's where control starts out:
215 __ align(CodeEntryAlignment);
216 address entry_point = __ pc();
217
218 if (VerifyMethodHandles) {
219 Label L;
220 BLOCK_COMMENT("verify_intrinsic_id {");
221 __ cmpb(Address(rbx_method, Method::intrinsic_id_offset_in_bytes()), (int) iid);
222 __ jcc(Assembler::equal, L);
223 if (iid == vmIntrinsics::_linkToVirtual ||
224 iid == vmIntrinsics::_linkToSpecial) {
225 // could do this for all kinds, but would explode assembly code size
226 trace_method_handle(_masm, "bad Method*::intrinsic_id");
227 }
228 __ STOP("bad Method*::intrinsic_id");
229 __ bind(L);
230 BLOCK_COMMENT("} verify_intrinsic_id");
231 }
232
233 // First task: Find out how big the argument list is.
234 Address rdx_first_arg_addr;
235 int ref_kind = signature_polymorphic_intrinsic_ref_kind(iid);
236 assert(ref_kind != 0 || iid == vmIntrinsics::_invokeBasic, "must be _invokeBasic or a linkTo intrinsic");
237 if (ref_kind == 0 || MethodHandles::ref_kind_has_receiver(ref_kind)) {
238 __ movptr(rdx_argp, Address(rbx_method, Method::const_offset()));
239 __ load_sized_value(rdx_argp,
240 Address(rdx_argp, ConstMethod::size_of_parameters_offset()),
241 sizeof(u2), /*is_signed*/ false);
242 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), "");
243 rdx_first_arg_addr = __ argument_address(rdx_argp, -1);
244 } else {
245 DEBUG_ONLY(rdx_argp = noreg);
246 }
247
248 if (!is_signature_polymorphic_static(iid)) {
249 __ movptr(rcx_mh, rdx_first_arg_addr);
250 DEBUG_ONLY(rdx_argp = noreg);
251 }
252
253 // rdx_first_arg_addr is live!
254
255 trace_method_handle_interpreter_entry(_masm, iid);
256
257 if (iid == vmIntrinsics::_invokeBasic) {
258 generate_method_handle_dispatch(_masm, iid, rcx_mh, noreg, not_for_compiler_entry);
259
260 } else {
261 // Adjust argument list by popping the trailing MemberName argument.
262 Register rcx_recv = noreg;
263 if (MethodHandles::ref_kind_has_receiver(ref_kind)) {
264 // Load the receiver (not the MH; the actual MemberName's receiver) up from the interpreter stack.
265 __ movptr(rcx_recv = rcx, rdx_first_arg_addr);
266 }
267 DEBUG_ONLY(rdx_argp = noreg);
268 Register rbx_member = rbx_method; // MemberName ptr; incoming method ptr is dead now
269 __ pop(rax_temp); // return address
270 __ pop(rbx_member); // extract last argument
271 __ push(rax_temp); // re-push return address
272 generate_method_handle_dispatch(_masm, iid, rcx_recv, rbx_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 rbx_method = rbx; // eventual target of this invocation
285 // temps used in this code are not used in *either* compiled or interpreted calling sequences
286 #ifdef _LP64
287 Register temp1 = rscratch1;
288 Register temp2 = rscratch2;
289 Register temp3 = rax;
290 if (for_compiler_entry) {
291 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : j_rarg0), "only valid assignment");
292 assert_different_registers(temp1, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5);
293 assert_different_registers(temp2, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5);
294 assert_different_registers(temp3, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5);
295 }
296 #else
297 Register temp1 = (for_compiler_entry ? rsi : rdx);
298 Register temp2 = rdi;
299 Register temp3 = rax;
300 if (for_compiler_entry) {
301 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : rcx), "only valid assignment");
302 assert_different_registers(temp1, rcx, rdx);
303 assert_different_registers(temp2, rcx, rdx);
304 assert_different_registers(temp3, rcx, rdx);
305 }
306 #endif
307 else {
308 assert_different_registers(temp1, temp2, temp3, saved_last_sp_register()); // don't trash lastSP
309 }
310 assert_different_registers(temp1, temp2, temp3, receiver_reg);
311 assert_different_registers(temp1, temp2, temp3, member_reg);
312
313 if (iid == vmIntrinsics::_invokeBasic) {
314 // indirect through MH.form.vmentry.vmtarget
315 jump_to_lambda_form(_masm, receiver_reg, rbx_method, temp1, for_compiler_entry);
316
317 } else {
318 // The method is a member invoker used by direct method handles.
319 if (VerifyMethodHandles) {
320 // make sure the trailing argument really is a MemberName (caller responsibility)
321 verify_klass(_masm, member_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_invoke_MemberName),
322 "MemberName required for invokeVirtual etc.");
323 }
324
325 Address member_clazz( member_reg, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes()));
326 Address member_vmindex( member_reg, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes()));
327 Address member_vmtarget( member_reg, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes()));
328
329 Register temp1_recv_klass = temp1;
330 if (iid != vmIntrinsics::_linkToStatic) {
331 __ verify_oop(receiver_reg);
332 if (iid == vmIntrinsics::_linkToSpecial) {
333 // Don't actually load the klass; just null-check the receiver.
334 __ null_check(receiver_reg);
335 } else {
336 // load receiver klass itself
337 __ null_check(receiver_reg, oopDesc::klass_offset_in_bytes());
338 __ load_klass(temp1_recv_klass, receiver_reg);
339 __ verify_klass_ptr(temp1_recv_klass);
340 }
341 BLOCK_COMMENT("check_receiver {");
342 // The receiver for the MemberName must be in receiver_reg.
343 // Check the receiver against the MemberName.clazz
344 if (VerifyMethodHandles && iid == vmIntrinsics::_linkToSpecial) {
345 // Did not load it above...
346 __ load_klass(temp1_recv_klass, receiver_reg);
347 __ verify_klass_ptr(temp1_recv_klass);
348 }
349 if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) {
350 Label L_ok;
351 Register temp2_defc = temp2;
352 __ load_heap_oop(temp2_defc, member_clazz);
353 load_klass_from_Class(_masm, temp2_defc);
354 __ verify_klass_ptr(temp2_defc);
355 __ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, L_ok);
356 // If we get here, the type check failed!
357 __ STOP("receiver class disagrees with MemberName.clazz");
358 __ bind(L_ok);
359 }
360 BLOCK_COMMENT("} check_receiver");
361 }
362 if (iid == vmIntrinsics::_linkToSpecial ||
363 iid == vmIntrinsics::_linkToStatic) {
364 DEBUG_ONLY(temp1_recv_klass = noreg); // these guys didn't load the recv_klass
365 }
366
367 // Live registers at this point:
368 // member_reg - MemberName that was the trailing argument
369 // temp1_recv_klass - klass of stacked receiver, if needed
370 // rsi/r13 - interpreter linkage (if interpreted)
371 // rcx, rdx, rsi, rdi, r8, r8 - compiler arguments (if compiled)
372
373 Label L_incompatible_class_change_error;
374 switch (iid) {
375 case vmIntrinsics::_linkToSpecial:
376 if (VerifyMethodHandles) {
377 verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp3);
378 }
379 __ movptr(rbx_method, member_vmtarget);
380 break;
381
382 case vmIntrinsics::_linkToStatic:
383 if (VerifyMethodHandles) {
384 verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp3);
385 }
386 __ movptr(rbx_method, member_vmtarget);
387 break;
388
389 case vmIntrinsics::_linkToVirtual:
390 {
391 // same as TemplateTable::invokevirtual,
392 // minus the CP setup and profiling:
393
394 if (VerifyMethodHandles) {
395 verify_ref_kind(_masm, JVM_REF_invokeVirtual, member_reg, temp3);
396 }
397
398 // pick out the vtable index from the MemberName, and then we can discard it:
399 Register temp2_index = temp2;
400 __ movptr(temp2_index, member_vmindex);
401
402 if (VerifyMethodHandles) {
403 Label L_index_ok;
404 __ cmpl(temp2_index, 0);
405 __ jcc(Assembler::greaterEqual, L_index_ok);
406 __ STOP("no virtual index");
407 __ BIND(L_index_ok);
408 }
409
410 // Note: The verifier invariants allow us to ignore MemberName.clazz and vmtarget
411 // at this point. And VerifyMethodHandles has already checked clazz, if needed.
412
413 // get target Method* & entry point
414 __ lookup_virtual_method(temp1_recv_klass, temp2_index, rbx_method);
415 break;
416 }
417
418 case vmIntrinsics::_linkToInterface:
419 {
420 // same as TemplateTable::invokeinterface
421 // (minus the CP setup and profiling, with different argument motion)
422 if (VerifyMethodHandles) {
423 verify_ref_kind(_masm, JVM_REF_invokeInterface, member_reg, temp3);
424 }
425
426 Register temp3_intf = temp3;
427 __ load_heap_oop(temp3_intf, member_clazz);
428 load_klass_from_Class(_masm, temp3_intf);
429 __ verify_klass_ptr(temp3_intf);
430
431 Register rbx_index = rbx_method;
432 __ movptr(rbx_index, member_vmindex);
433 if (VerifyMethodHandles) {
434 Label L;
435 __ cmpl(rbx_index, 0);
436 __ jcc(Assembler::greaterEqual, L);
437 __ STOP("invalid vtable index for MH.invokeInterface");
438 __ bind(L);
439 }
440
441 // given intf, index, and recv klass, dispatch to the implementation method
442 __ lookup_interface_method(temp1_recv_klass, temp3_intf,
443 // note: next two args must be the same:
444 rbx_index, rbx_method,
445 temp2,
446 L_incompatible_class_change_error);
447 break;
448 }
449
450 default:
451 fatal(err_msg_res("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid)));
452 break;
453 }
454
455 // Live at this point:
456 // rbx_method
457 // rsi/r13 (if interpreted)
458
459 // After figuring out which concrete method to call, jump into it.
460 // Note that this works in the interpreter with no data motion.
461 // But the compiled version will require that rcx_recv be shifted out.
462 __ verify_method_ptr(rbx_method);
463 jump_from_method_handle(_masm, rbx_method, temp1, for_compiler_entry);
464
465 if (iid == vmIntrinsics::_linkToInterface) {
466 __ bind(L_incompatible_class_change_error);
467 __ jump(RuntimeAddress(StubRoutines::throw_IncompatibleClassChangeError_entry()));
468 }
469 }
470 }
471
472 #ifndef PRODUCT
473 void trace_method_handle_stub(const char* adaptername,
474 oop mh,
475 intptr_t* saved_regs,
476 intptr_t* entry_sp) {
477 // called as a leaf from native code: do not block the JVM!
478 bool has_mh = (strstr(adaptername, "/static") == NULL &&
479 strstr(adaptername, "linkTo") == NULL); // static linkers don't have MH
480 const char* mh_reg_name = has_mh ? "rcx_mh" : "rcx";
481 tty->print_cr("MH %s %s="PTR_FORMAT" sp="PTR_FORMAT,
482 adaptername, mh_reg_name,
483 mh, entry_sp);
484
485 if (Verbose) {
486 tty->print_cr("Registers:");
487 const int saved_regs_count = RegisterImpl::number_of_registers;
488 for (int i = 0; i < saved_regs_count; i++) {
489 Register r = as_Register(i);
490 // The registers are stored in reverse order on the stack (by pusha).
491 tty->print("%3s=" PTR_FORMAT, r->name(), saved_regs[((saved_regs_count - 1) - i)]);
492 if ((i + 1) % 4 == 0) {
493 tty->cr();
494 } else {
495 tty->print(", ");
496 }
497 }
498 tty->cr();
499
500 {
501 // dumping last frame with frame::describe
502
503 JavaThread* p = JavaThread::active();
504
505 ResourceMark rm;
506 PRESERVE_EXCEPTION_MARK; // may not be needed by safer and unexpensive here
507 FrameValues values;
508
509 // Note: We want to allow trace_method_handle from any call site.
510 // While trace_method_handle creates a frame, it may be entered
511 // without a PC on the stack top (e.g. not just after a call).
512 // Walking that frame could lead to failures due to that invalid PC.
513 // => carefully detect that frame when doing the stack walking
514
515 // Current C frame
516 frame cur_frame = os::current_frame();
517
518 // Robust search of trace_calling_frame (independant of inlining).
519 // Assumes saved_regs comes from a pusha in the trace_calling_frame.
520 assert(cur_frame.sp() < saved_regs, "registers not saved on stack ?");
521 frame trace_calling_frame = os::get_sender_for_C_frame(&cur_frame);
522 while (trace_calling_frame.fp() < saved_regs) {
523 trace_calling_frame = os::get_sender_for_C_frame(&trace_calling_frame);
524 }
525
526 // safely create a frame and call frame::describe
527 intptr_t *dump_sp = trace_calling_frame.sender_sp();
528 intptr_t *dump_fp = trace_calling_frame.link();
529
530 bool walkable = has_mh; // whether the traced frame shoud be walkable
531
532 if (walkable) {
533 // The previous definition of walkable may have to be refined
534 // if new call sites cause the next frame constructor to start
535 // failing. Alternatively, frame constructors could be
536 // modified to support the current or future non walkable
537 // frames (but this is more intrusive and is not considered as
538 // part of this RFE, which will instead use a simpler output).
539 frame dump_frame = frame(dump_sp, dump_fp);
540 dump_frame.describe(values, 1);
541 } else {
542 // Stack may not be walkable (invalid PC above FP):
543 // Add descriptions without building a Java frame to avoid issues
544 values.describe(-1, dump_fp, "fp for #1 <not parsed, cannot trust pc>");
545 values.describe(-1, dump_sp, "sp for #1");
546 }
547 values.describe(-1, entry_sp, "raw top of stack");
548
549 tty->print_cr("Stack layout:");
550 values.print(p);
551 }
552 if (has_mh && mh->is_oop()) {
553 mh->print();
554 if (java_lang_invoke_MethodHandle::is_instance(mh)) {
555 if (java_lang_invoke_MethodHandle::form_offset_in_bytes() != 0)
556 java_lang_invoke_MethodHandle::form(mh)->print();
557 }
558 }
559 }
560 }
561
562 // The stub wraps the arguments in a struct on the stack to avoid
563 // dealing with the different calling conventions for passing 6
564 // arguments.
565 struct MethodHandleStubArguments {
566 const char* adaptername;
567 oopDesc* mh;
568 intptr_t* saved_regs;
569 intptr_t* entry_sp;
570 };
571 void trace_method_handle_stub_wrapper(MethodHandleStubArguments* args) {
572 trace_method_handle_stub(args->adaptername,
573 args->mh,
574 args->saved_regs,
575 args->entry_sp);
576 }
577
578 void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) {
579 if (!TraceMethodHandles) return;
580 BLOCK_COMMENT("trace_method_handle {");
581 __ enter();
582 __ andptr(rsp, -16); // align stack if needed for FPU state
583 __ pusha();
584 __ mov(rbx, rsp); // for retreiving saved_regs
585 // Note: saved_regs must be in the entered frame for the
586 // robust stack walking implemented in trace_method_handle_stub.
587
588 // save FP result, valid at some call sites (adapter_opt_return_float, ...)
589 __ increment(rsp, -2 * wordSize);
590 if (UseSSE >= 2) {
591 __ movdbl(Address(rsp, 0), xmm0);
592 } else if (UseSSE == 1) {
593 __ movflt(Address(rsp, 0), xmm0);
594 } else {
595 __ fst_d(Address(rsp, 0));
596 }
597
598 // Incoming state:
599 // rcx: method handle
600 //
601 // To avoid calling convention issues, build a record on the stack
602 // and pass the pointer to that instead.
603 __ push(rbp); // entry_sp (with extra align space)
604 __ push(rbx); // pusha saved_regs
605 __ push(rcx); // mh
606 __ push(rcx); // slot for adaptername
607 __ movptr(Address(rsp, 0), (intptr_t) adaptername);
608 __ super_call_VM_leaf(CAST_FROM_FN_PTR(address, trace_method_handle_stub_wrapper), rsp);
609 __ increment(rsp, sizeof(MethodHandleStubArguments));
610
611 if (UseSSE >= 2) {
612 __ movdbl(xmm0, Address(rsp, 0));
613 } else if (UseSSE == 1) {
614 __ movflt(xmm0, Address(rsp, 0));
615 } else {
616 __ fld_d(Address(rsp, 0));
617 }
618 __ increment(rsp, 2 * wordSize);
619
620 __ popa();
621 __ leave();
622 BLOCK_COMMENT("} trace_method_handle");
623 }
624 #endif //PRODUCT