1 /*
2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "asm/macroAssembler.hpp"
27 #include "classfile/javaClasses.inline.hpp"
28 #include "interpreter/interpreter.hpp"
29 #include "interpreter/interpreterRuntime.hpp"
30 #include "memory/allocation.inline.hpp"
31 #include "prims/methodHandles.hpp"
32
33 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
34
35 #define __ _masm->
36
37 #ifdef PRODUCT
38 #define BLOCK_COMMENT(str) /* nothing */
39 #define STOP(error) stop(error)
40 #else
41 #define BLOCK_COMMENT(str) __ block_comment(str)
42 #define STOP(error) block_comment(error); __ stop(error)
43 #endif
44
45 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":")
46
47 void MethodHandles::load_klass_from_Class(MacroAssembler* _masm, Register klass_reg) {
48 if (VerifyMethodHandles)
49 verify_klass(_masm, klass_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_Class),
50 "MH argument is a Class");
51 __ movptr(klass_reg, Address(klass_reg, java_lang_Class::klass_offset_in_bytes()));
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, SystemDictionary::WKID klass_id,
67 const char* error_message) {
68 Klass** klass_addr = SystemDictionary::well_known_klass_addr(klass_id);
69 KlassHandle klass = SystemDictionary::well_known_klass(klass_id);
70 Register temp = rdi;
71 Register temp2 = noreg;
72 LP64_ONLY(temp2 = rscratch1); // used by MacroAssembler::cmpptr
73 Label L_ok, L_bad;
74 BLOCK_COMMENT("verify_klass {");
75 __ verify_oop(obj);
76 __ testptr(obj, obj);
77 __ jcc(Assembler::zero, L_bad);
78 __ push(temp); if (temp2 != noreg) __ push(temp2);
79 #define UNPUSH { if (temp2 != noreg) __ pop(temp2); __ pop(temp); }
80 __ load_klass(temp, obj);
81 __ cmpptr(temp, ExternalAddress((address) klass_addr));
82 __ jcc(Assembler::equal, L_ok);
83 intptr_t super_check_offset = klass->super_check_offset();
84 __ movptr(temp, Address(temp, super_check_offset));
85 __ cmpptr(temp, ExternalAddress((address) klass_addr));
86 __ jcc(Assembler::equal, L_ok);
87 UNPUSH;
88 __ bind(L_bad);
89 __ STOP(error_message);
90 __ BIND(L_ok);
91 UNPUSH;
92 BLOCK_COMMENT("} verify_klass");
93 }
94
95 void MethodHandles::verify_ref_kind(MacroAssembler* _masm, int ref_kind, Register member_reg, Register temp) {
96 Label L;
97 BLOCK_COMMENT("verify_ref_kind {");
98 __ movl(temp, Address(member_reg, NONZERO(java_lang_invoke_MemberName::flags_offset_in_bytes())));
99 __ shrl(temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT);
100 __ andl(temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK);
101 __ cmpl(temp, ref_kind);
102 __ jcc(Assembler::equal, L);
103 { char* buf = NEW_C_HEAP_ARRAY(char, 100, mtInternal);
104 jio_snprintf(buf, 100, "verify_ref_kind expected %x", ref_kind);
105 if (ref_kind == JVM_REF_invokeVirtual ||
106 ref_kind == JVM_REF_invokeSpecial)
107 // could do this for all ref_kinds, but would explode assembly code size
108 trace_method_handle(_masm, buf);
109 __ STOP(buf);
110 }
111 BLOCK_COMMENT("} verify_ref_kind");
112 __ bind(L);
113 }
114
115 #endif //ASSERT
116
117 void MethodHandles::jump_from_method_handle(MacroAssembler* _masm, Register method, Register temp,
118 bool for_compiler_entry) {
119 assert(method == rbx, "interpreter calling convention");
120
121 Label L_no_such_method;
122 __ testptr(rbx, rbx);
123 __ jcc(Assembler::zero, L_no_such_method);
124
125 __ verify_method_ptr(method);
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 #ifdef _LP64
133 Register rthread = r15_thread;
134 #else
135 Register rthread = temp;
136 __ get_thread(rthread);
137 #endif
138 // interp_only is an int, on little endian it is sufficient to test the byte only
139 // Is a cmpl faster?
140 __ cmpb(Address(rthread, JavaThread::interp_only_mode_offset()), 0);
141 __ jccb(Assembler::zero, run_compiled_code);
142 __ jmp(Address(method, Method::interpreter_entry_offset()));
143 __ BIND(run_compiled_code);
144 }
145
146 const ByteSize entry_offset = for_compiler_entry ? Method::from_compiled_offset() :
147 Method::from_interpreted_offset();
148 __ jmp(Address(method, entry_offset));
149
150 __ bind(L_no_such_method);
151 __ jump(RuntimeAddress(StubRoutines::throw_AbstractMethodError_entry()));
152 }
153
154 void MethodHandles::jump_to_lambda_form(MacroAssembler* _masm,
155 Register recv, Register method_temp,
156 Register temp2,
157 bool for_compiler_entry) {
158 BLOCK_COMMENT("jump_to_lambda_form {");
159 // This is the initial entry point of a lazy method handle.
160 // After type checking, it picks up the invoker from the LambdaForm.
161 assert_different_registers(recv, method_temp, temp2);
162 assert(recv != noreg, "required register");
163 assert(method_temp == rbx, "required register for loading method");
164
165 //NOT_PRODUCT({ FlagSetting fs(TraceMethodHandles, true); trace_method_handle(_masm, "LZMH"); });
166
167 // Load the invoker, as MH -> MH.form -> LF.vmentry
168 __ verify_oop(recv);
169 __ load_heap_oop(method_temp, Address(recv, NONZERO(java_lang_invoke_MethodHandle::form_offset_in_bytes())));
170 __ verify_oop(method_temp);
171 __ load_heap_oop(method_temp, Address(method_temp, NONZERO(java_lang_invoke_LambdaForm::vmentry_offset_in_bytes())));
172 __ verify_oop(method_temp);
173 // the following assumes that a Method* is normally compressed in the vmtarget field:
174 __ movptr(method_temp, Address(method_temp, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes())));
175
176 if (VerifyMethodHandles && !for_compiler_entry) {
177 // make sure recv is already on stack
178 __ movptr(temp2, Address(method_temp, Method::const_offset()));
179 __ load_sized_value(temp2,
180 Address(temp2, ConstMethod::size_of_parameters_offset()),
181 sizeof(u2), /*is_signed*/ false);
182 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), "");
183 Label L;
184 __ cmpptr(recv, __ argument_address(temp2, -1));
185 __ jcc(Assembler::equal, L);
186 __ movptr(rax, __ argument_address(temp2, -1));
187 __ STOP("receiver not on stack");
188 __ BIND(L);
189 }
190
191 jump_from_method_handle(_masm, method_temp, temp2, for_compiler_entry);
192 BLOCK_COMMENT("} jump_to_lambda_form");
193 }
194
195
196 // Code generation
197 address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm,
198 vmIntrinsics::ID iid) {
199 const bool not_for_compiler_entry = false; // this is the interpreter entry
200 assert(is_signature_polymorphic(iid), "expected invoke iid");
201 if (iid == vmIntrinsics::_invokeGeneric ||
202 iid == vmIntrinsics::_compiledLambdaForm) {
203 // Perhaps surprisingly, the symbolic references visible to Java are not directly used.
204 // They are linked to Java-generated adapters via MethodHandleNatives.linkMethod.
205 // They all allow an appendix argument.
206 __ hlt(); // empty stubs make SG sick
207 return NULL;
208 }
209
210 // rsi/r13: sender SP (must preserve; see prepare_to_jump_from_interpreted)
211 // rbx: Method*
212 // rdx: argument locator (parameter slot count, added to rsp)
213 // rcx: used as temp to hold mh or receiver
214 // rax, rdi: garbage temps, blown away
215 Register rdx_argp = rdx; // argument list ptr, live on error paths
216 Register rax_temp = rax;
217 Register rcx_mh = rcx; // MH receiver; dies quickly and is recycled
218 Register rbx_method = rbx; // eventual target of this invocation
219
220 // here's where control starts out:
221 __ align(CodeEntryAlignment);
222 address entry_point = __ pc();
223
224 if (VerifyMethodHandles) {
225 Label L;
226 BLOCK_COMMENT("verify_intrinsic_id {");
227 __ cmpb(Address(rbx_method, Method::intrinsic_id_offset_in_bytes()), (int) iid);
228 __ jcc(Assembler::equal, L);
229 if (iid == vmIntrinsics::_linkToVirtual ||
230 iid == vmIntrinsics::_linkToSpecial) {
231 // could do this for all kinds, but would explode assembly code size
232 trace_method_handle(_masm, "bad Method*::intrinsic_id");
233 }
234 __ STOP("bad Method*::intrinsic_id");
235 __ bind(L);
236 BLOCK_COMMENT("} verify_intrinsic_id");
237 }
238
239 // First task: Find out how big the argument list is.
240 Address rdx_first_arg_addr;
241 int ref_kind = signature_polymorphic_intrinsic_ref_kind(iid);
242 assert(ref_kind != 0 || iid == vmIntrinsics::_invokeBasic, "must be _invokeBasic or a linkTo intrinsic");
243 if (ref_kind == 0 || MethodHandles::ref_kind_has_receiver(ref_kind)) {
244 __ movptr(rdx_argp, Address(rbx_method, Method::const_offset()));
245 __ load_sized_value(rdx_argp,
246 Address(rdx_argp, ConstMethod::size_of_parameters_offset()),
247 sizeof(u2), /*is_signed*/ false);
248 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), "");
249 rdx_first_arg_addr = __ argument_address(rdx_argp, -1);
250 } else {
251 DEBUG_ONLY(rdx_argp = noreg);
252 }
253
254 if (!is_signature_polymorphic_static(iid)) {
255 __ movptr(rcx_mh, rdx_first_arg_addr);
256 DEBUG_ONLY(rdx_argp = noreg);
257 }
258
259 // rdx_first_arg_addr is live!
260
261 trace_method_handle_interpreter_entry(_masm, iid);
262
263 if (iid == vmIntrinsics::_invokeBasic) {
264 generate_method_handle_dispatch(_masm, iid, rcx_mh, noreg, not_for_compiler_entry);
265
266 } else {
267 // Adjust argument list by popping the trailing MemberName argument.
268 Register rcx_recv = noreg;
269 if (MethodHandles::ref_kind_has_receiver(ref_kind)) {
270 // Load the receiver (not the MH; the actual MemberName's receiver) up from the interpreter stack.
271 __ movptr(rcx_recv = rcx, rdx_first_arg_addr);
272 }
273 DEBUG_ONLY(rdx_argp = noreg);
274 Register rbx_member = rbx_method; // MemberName ptr; incoming method ptr is dead now
275 __ pop(rax_temp); // return address
276 __ pop(rbx_member); // extract last argument
277 __ push(rax_temp); // re-push return address
278 generate_method_handle_dispatch(_masm, iid, rcx_recv, rbx_member, not_for_compiler_entry);
279 }
280
281 return entry_point;
282 }
283
284 void MethodHandles::generate_method_handle_dispatch(MacroAssembler* _masm,
285 vmIntrinsics::ID iid,
286 Register receiver_reg,
287 Register member_reg,
288 bool for_compiler_entry) {
289 assert(is_signature_polymorphic(iid), "expected invoke iid");
290 Register rbx_method = rbx; // eventual target of this invocation
291 // temps used in this code are not used in *either* compiled or interpreted calling sequences
292 #ifdef _LP64
293 Register temp1 = rscratch1;
294 Register temp2 = rscratch2;
295 Register temp3 = rax;
296 if (for_compiler_entry) {
297 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : j_rarg0), "only valid assignment");
298 assert_different_registers(temp1, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5);
299 assert_different_registers(temp2, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5);
300 assert_different_registers(temp3, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5);
301 }
302 #else
303 Register temp1 = (for_compiler_entry ? rsi : rdx);
304 Register temp2 = rdi;
305 Register temp3 = rax;
306 if (for_compiler_entry) {
307 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : rcx), "only valid assignment");
308 assert_different_registers(temp1, rcx, rdx);
309 assert_different_registers(temp2, rcx, rdx);
310 assert_different_registers(temp3, rcx, rdx);
311 }
312 #endif
313 else {
314 assert_different_registers(temp1, temp2, temp3, saved_last_sp_register()); // don't trash lastSP
315 }
316 assert_different_registers(temp1, temp2, temp3, receiver_reg);
317 assert_different_registers(temp1, temp2, temp3, member_reg);
318
319 if (iid == vmIntrinsics::_invokeBasic) {
320 // indirect through MH.form.vmentry.vmtarget
321 jump_to_lambda_form(_masm, receiver_reg, rbx_method, temp1, for_compiler_entry);
322
323 } else {
324 // The method is a member invoker used by direct method handles.
325 if (VerifyMethodHandles) {
326 // make sure the trailing argument really is a MemberName (caller responsibility)
327 verify_klass(_masm, member_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_invoke_MemberName),
328 "MemberName required for invokeVirtual etc.");
329 }
330
331 Address member_clazz( member_reg, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes()));
332 Address member_vmindex( member_reg, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes()));
333 Address member_vmtarget( member_reg, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes()));
334
335 Register temp1_recv_klass = temp1;
336 if (iid != vmIntrinsics::_linkToStatic) {
337 __ verify_oop(receiver_reg);
338 if (iid == vmIntrinsics::_linkToSpecial) {
339 // Don't actually load the klass; just null-check the receiver.
340 __ null_check(receiver_reg);
341 } else {
342 // load receiver klass itself
343 __ null_check(receiver_reg, oopDesc::klass_offset_in_bytes());
344 __ load_klass(temp1_recv_klass, receiver_reg);
345 __ verify_klass_ptr(temp1_recv_klass);
346 }
347 BLOCK_COMMENT("check_receiver {");
348 // The receiver for the MemberName must be in receiver_reg.
349 // Check the receiver against the MemberName.clazz
350 if (VerifyMethodHandles && iid == vmIntrinsics::_linkToSpecial) {
351 // Did not load it above...
352 __ load_klass(temp1_recv_klass, receiver_reg);
353 __ verify_klass_ptr(temp1_recv_klass);
354 }
355 if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) {
356 Label L_ok;
357 Register temp2_defc = temp2;
358 __ load_heap_oop(temp2_defc, member_clazz);
359 load_klass_from_Class(_masm, temp2_defc);
360 __ verify_klass_ptr(temp2_defc);
361 __ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, L_ok);
362 // If we get here, the type check failed!
363 __ STOP("receiver class disagrees with MemberName.clazz");
364 __ bind(L_ok);
365 }
366 BLOCK_COMMENT("} check_receiver");
367 }
368 if (iid == vmIntrinsics::_linkToSpecial ||
369 iid == vmIntrinsics::_linkToStatic) {
370 DEBUG_ONLY(temp1_recv_klass = noreg); // these guys didn't load the recv_klass
371 }
372
373 // Live registers at this point:
374 // member_reg - MemberName that was the trailing argument
375 // temp1_recv_klass - klass of stacked receiver, if needed
376 // rsi/r13 - interpreter linkage (if interpreted)
377 // rcx, rdx, rsi, rdi, r8 - compiler arguments (if compiled)
378
379 Label L_incompatible_class_change_error;
380 switch (iid) {
381 case vmIntrinsics::_linkToSpecial:
382 if (VerifyMethodHandles) {
383 verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp3);
384 }
385 __ movptr(rbx_method, member_vmtarget);
386 break;
387
388 case vmIntrinsics::_linkToStatic:
389 if (VerifyMethodHandles) {
390 verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp3);
391 }
392 __ movptr(rbx_method, member_vmtarget);
393 break;
394
395 case vmIntrinsics::_linkToVirtual:
396 {
397 // same as TemplateTable::invokevirtual,
398 // minus the CP setup and profiling:
399
400 if (VerifyMethodHandles) {
401 verify_ref_kind(_masm, JVM_REF_invokeVirtual, member_reg, temp3);
402 }
403
404 // pick out the vtable index from the MemberName, and then we can discard it:
405 Register temp2_index = temp2;
406 __ movptr(temp2_index, member_vmindex);
407
408 if (VerifyMethodHandles) {
409 Label L_index_ok;
410 __ cmpl(temp2_index, 0);
411 __ jcc(Assembler::greaterEqual, L_index_ok);
412 __ STOP("no virtual index");
413 __ BIND(L_index_ok);
414 }
415
416 // Note: The verifier invariants allow us to ignore MemberName.clazz and vmtarget
417 // at this point. And VerifyMethodHandles has already checked clazz, if needed.
418
419 // get target Method* & entry point
420 __ lookup_virtual_method(temp1_recv_klass, temp2_index, rbx_method);
421 break;
422 }
423
424 case vmIntrinsics::_linkToInterface:
425 {
426 // same as TemplateTable::invokeinterface
427 // (minus the CP setup and profiling, with different argument motion)
428 if (VerifyMethodHandles) {
429 verify_ref_kind(_masm, JVM_REF_invokeInterface, member_reg, temp3);
430 }
431
432 Register temp3_intf = temp3;
433 __ load_heap_oop(temp3_intf, member_clazz);
434 load_klass_from_Class(_masm, temp3_intf);
435 __ verify_klass_ptr(temp3_intf);
436
437 Register rbx_index = rbx_method;
438 __ movptr(rbx_index, member_vmindex);
439 if (VerifyMethodHandles) {
440 Label L;
441 __ cmpl(rbx_index, 0);
442 __ jcc(Assembler::greaterEqual, L);
443 __ STOP("invalid vtable index for MH.invokeInterface");
444 __ bind(L);
445 }
446
447 // given intf, index, and recv klass, dispatch to the implementation method
448 __ lookup_interface_method(temp1_recv_klass, temp3_intf,
449 // note: next two args must be the same:
450 rbx_index, rbx_method,
451 temp2,
452 L_incompatible_class_change_error);
453 break;
454 }
455
456 default:
457 fatal(err_msg_res("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid)));
458 break;
459 }
460
461 // Live at this point:
462 // rbx_method
463 // rsi/r13 (if interpreted)
464
465 // After figuring out which concrete method to call, jump into it.
466 // Note that this works in the interpreter with no data motion.
467 // But the compiled version will require that rcx_recv be shifted out.
468 __ verify_method_ptr(rbx_method);
469 jump_from_method_handle(_masm, rbx_method, temp1, for_compiler_entry);
470
471 if (iid == vmIntrinsics::_linkToInterface) {
472 __ bind(L_incompatible_class_change_error);
473 __ jump(RuntimeAddress(StubRoutines::throw_IncompatibleClassChangeError_entry()));
474 }
475 }
476 }
477
478 #ifndef PRODUCT
479 void trace_method_handle_stub(const char* adaptername,
480 oop mh,
481 intptr_t* saved_regs,
482 intptr_t* entry_sp) {
483 // called as a leaf from native code: do not block the JVM!
484 bool has_mh = (strstr(adaptername, "/static") == NULL &&
485 strstr(adaptername, "linkTo") == NULL); // static linkers don't have MH
486 const char* mh_reg_name = has_mh ? "rcx_mh" : "rcx";
487 tty->print_cr("MH %s %s=" PTR_FORMAT " sp=" PTR_FORMAT,
488 adaptername, mh_reg_name,
489 (void *)mh, entry_sp);
490
491 if (Verbose) {
492 tty->print_cr("Registers:");
493 const int saved_regs_count = RegisterImpl::number_of_registers;
494 for (int i = 0; i < saved_regs_count; i++) {
495 Register r = as_Register(i);
496 // The registers are stored in reverse order on the stack (by pusha).
497 tty->print("%3s=" PTR_FORMAT, r->name(), saved_regs[((saved_regs_count - 1) - i)]);
498 if ((i + 1) % 4 == 0) {
499 tty->cr();
500 } else {
501 tty->print(", ");
502 }
503 }
504 tty->cr();
505
506 {
507 // dumping last frame with frame::describe
508
509 JavaThread* p = JavaThread::active();
510
511 ResourceMark rm;
512 PRESERVE_EXCEPTION_MARK; // may not be needed by safer and unexpensive here
513 FrameValues values;
514
515 // Note: We want to allow trace_method_handle from any call site.
516 // While trace_method_handle creates a frame, it may be entered
517 // without a PC on the stack top (e.g. not just after a call).
518 // Walking that frame could lead to failures due to that invalid PC.
519 // => carefully detect that frame when doing the stack walking
520
521 // Current C frame
522 frame cur_frame = os::current_frame();
523
524 // Robust search of trace_calling_frame (independant of inlining).
525 // Assumes saved_regs comes from a pusha in the trace_calling_frame.
526 assert(cur_frame.sp() < saved_regs, "registers not saved on stack ?");
527 frame trace_calling_frame = os::get_sender_for_C_frame(&cur_frame);
528 while (trace_calling_frame.fp() < saved_regs) {
529 trace_calling_frame = os::get_sender_for_C_frame(&trace_calling_frame);
530 }
531
532 // safely create a frame and call frame::describe
533 intptr_t *dump_sp = trace_calling_frame.sender_sp();
534 intptr_t *dump_fp = trace_calling_frame.link();
535
536 bool walkable = has_mh; // whether the traced frame shoud be walkable
537
538 if (walkable) {
539 // The previous definition of walkable may have to be refined
540 // if new call sites cause the next frame constructor to start
541 // failing. Alternatively, frame constructors could be
542 // modified to support the current or future non walkable
543 // frames (but this is more intrusive and is not considered as
544 // part of this RFE, which will instead use a simpler output).
545 frame dump_frame = frame(dump_sp, dump_fp);
546 dump_frame.describe(values, 1);
547 } else {
548 // Stack may not be walkable (invalid PC above FP):
549 // Add descriptions without building a Java frame to avoid issues
550 values.describe(-1, dump_fp, "fp for #1 <not parsed, cannot trust pc>");
551 values.describe(-1, dump_sp, "sp for #1");
552 }
553 values.describe(-1, entry_sp, "raw top of stack");
554
555 tty->print_cr("Stack layout:");
556 values.print(p);
557 }
558 if (has_mh && mh->is_oop()) {
559 mh->print();
560 if (java_lang_invoke_MethodHandle::is_instance(mh)) {
561 if (java_lang_invoke_MethodHandle::form_offset_in_bytes() != 0)
562 java_lang_invoke_MethodHandle::form(mh)->print();
563 }
564 }
565 }
566 }
567
568 // The stub wraps the arguments in a struct on the stack to avoid
569 // dealing with the different calling conventions for passing 6
570 // arguments.
571 struct MethodHandleStubArguments {
572 const char* adaptername;
573 oopDesc* mh;
574 intptr_t* saved_regs;
575 intptr_t* entry_sp;
576 };
577 void trace_method_handle_stub_wrapper(MethodHandleStubArguments* args) {
578 trace_method_handle_stub(args->adaptername,
579 args->mh,
580 args->saved_regs,
581 args->entry_sp);
582 }
583
584 void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) {
585 if (!TraceMethodHandles) return;
586 BLOCK_COMMENT("trace_method_handle {");
587 __ enter();
588 __ andptr(rsp, -16); // align stack if needed for FPU state
589 __ pusha();
590 __ mov(rbx, rsp); // for retreiving saved_regs
591 // Note: saved_regs must be in the entered frame for the
592 // robust stack walking implemented in trace_method_handle_stub.
593
594 // save FP result, valid at some call sites (adapter_opt_return_float, ...)
595 __ increment(rsp, -2 * wordSize);
596 if (UseSSE >= 2) {
597 __ movdbl(Address(rsp, 0), xmm0);
598 } else if (UseSSE == 1) {
599 __ movflt(Address(rsp, 0), xmm0);
600 } else {
601 __ fst_d(Address(rsp, 0));
602 }
603
604 // Incoming state:
605 // rcx: method handle
606 //
607 // To avoid calling convention issues, build a record on the stack
608 // and pass the pointer to that instead.
609 __ push(rbp); // entry_sp (with extra align space)
610 __ push(rbx); // pusha saved_regs
611 __ push(rcx); // mh
612 __ push(rcx); // slot for adaptername
613 __ movptr(Address(rsp, 0), (intptr_t) adaptername);
614 __ super_call_VM_leaf(CAST_FROM_FN_PTR(address, trace_method_handle_stub_wrapper), rsp);
615 __ increment(rsp, sizeof(MethodHandleStubArguments));
616
617 if (UseSSE >= 2) {
618 __ movdbl(xmm0, Address(rsp, 0));
619 } else if (UseSSE == 1) {
620 __ movflt(xmm0, Address(rsp, 0));
621 } else {
622 __ fld_d(Address(rsp, 0));
623 }
624 __ increment(rsp, 2 * wordSize);
625
626 __ popa();
627 __ leave();
628 BLOCK_COMMENT("} trace_method_handle");
629 }
630 #endif //PRODUCT