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 "interpreter/interpreter.hpp"
27 #include "interpreter/interpreterRuntime.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 void MethodHandles::load_klass_from_Class(MacroAssembler* _masm, Register klass_reg) {
44 if (VerifyMethodHandles)
45 verify_klass(_masm, klass_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_Class),
46 "MH argument is a Class");
47 __ movptr(klass_reg, Address(klass_reg, java_lang_Class::klass_offset_in_bytes()));
48 }
49
50 #ifdef ASSERT
51 static int check_nonzero(const char* xname, int x) {
52 assert(x != 0, err_msg("%s should be nonzero", xname));
53 return x;
54 }
55 #define NONZERO(x) check_nonzero(#x, x)
56 #else //ASSERT
57 #define NONZERO(x) (x)
58 #endif //ASSERT
59
60 #ifdef ASSERT
61 void MethodHandles::verify_klass(MacroAssembler* _masm,
62 Register obj, SystemDictionary::WKID klass_id,
63 const char* error_message) {
64 Klass** klass_addr = SystemDictionary::well_known_klass_addr(klass_id);
65 KlassHandle klass = SystemDictionary::well_known_klass(klass_id);
66 Register temp = rdi;
67 Register temp2 = noreg;
68 LP64_ONLY(temp2 = rscratch1); // used by MacroAssembler::cmpptr
69 Label L_ok, L_bad;
70 BLOCK_COMMENT("verify_klass {");
71 __ verify_oop(obj);
72 __ testptr(obj, obj);
73 __ jcc(Assembler::zero, L_bad);
74 __ push(temp); if (temp2 != noreg) __ push(temp2);
75 #define UNPUSH { if (temp2 != noreg) __ pop(temp2); __ pop(temp); }
76 __ load_klass(temp, obj);
77 __ cmpptr(temp, ExternalAddress((address) klass_addr));
78 __ jcc(Assembler::equal, L_ok);
79 intptr_t super_check_offset = klass->super_check_offset();
80 __ movptr(temp, Address(temp, super_check_offset));
81 __ cmpptr(temp, ExternalAddress((address) klass_addr));
82 __ jcc(Assembler::equal, L_ok);
83 UNPUSH;
84 __ bind(L_bad);
85 __ STOP(error_message);
86 __ BIND(L_ok);
87 UNPUSH;
88 BLOCK_COMMENT("} verify_klass");
89 }
90
91 void MethodHandles::verify_ref_kind(MacroAssembler* _masm, int ref_kind, Register member_reg, Register temp) {
92 Label L;
93 BLOCK_COMMENT("verify_ref_kind {");
94 __ movl(temp, Address(member_reg, NONZERO(java_lang_invoke_MemberName::flags_offset_in_bytes())));
95 __ shrl(temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT);
96 __ andl(temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK);
97 __ cmpl(temp, ref_kind);
98 __ jcc(Assembler::equal, L);
99 { char* buf = NEW_C_HEAP_ARRAY(char, 100, mtInternal);
100 jio_snprintf(buf, 100, "verify_ref_kind expected %x", ref_kind);
101 if (ref_kind == JVM_REF_invokeVirtual ||
102 ref_kind == JVM_REF_invokeSpecial)
103 // could do this for all ref_kinds, but would explode assembly code size
104 trace_method_handle(_masm, buf);
105 __ STOP(buf);
106 }
107 BLOCK_COMMENT("} verify_ref_kind");
108 __ bind(L);
109 }
110
111 #endif //ASSERT
112
113 void MethodHandles::jump_from_method_handle(MacroAssembler* _masm, Register method, Register temp,
114 bool for_compiler_entry) {
115 assert(method == rbx, "interpreter calling convention");
116 __ verify_method_ptr(method);
117
118 if (!for_compiler_entry && JvmtiExport::can_post_interpreter_events()) {
119 Label run_compiled_code;
120 // JVMTI events, such as single-stepping, are implemented partly by avoiding running
121 // compiled code in threads for which the event is enabled. Check here for
122 // interp_only_mode if these events CAN be enabled.
123 #ifdef _LP64
124 Register rthread = r15_thread;
125 #else
126 Register rthread = temp;
127 __ get_thread(rthread);
128 #endif
129 // interp_only is an int, on little endian it is sufficient to test the byte only
130 // Is a cmpl faster?
131 __ cmpb(Address(rthread, JavaThread::interp_only_mode_offset()), 0);
132 __ jccb(Assembler::zero, run_compiled_code);
133 __ jmp(Address(method, Method::interpreter_entry_offset()));
134 __ BIND(run_compiled_code);
135 }
136
137 const ByteSize entry_offset = for_compiler_entry ? Method::from_compiled_offset() :
138 Method::from_interpreted_offset();
139 __ jmp(Address(method, entry_offset));
140 }
141
142 void MethodHandles::jump_to_lambda_form(MacroAssembler* _masm,
143 Register recv, Register method_temp,
144 Register temp2,
145 bool for_compiler_entry) {
146 BLOCK_COMMENT("jump_to_lambda_form {");
147 // This is the initial entry point of a lazy method handle.
148 // After type checking, it picks up the invoker from the LambdaForm.
149 assert_different_registers(recv, method_temp, temp2);
150 assert(recv != noreg, "required register");
151 assert(method_temp == rbx, "required register for loading method");
152
153 //NOT_PRODUCT({ FlagSetting fs(TraceMethodHandles, true); trace_method_handle(_masm, "LZMH"); });
154
155 // Load the invoker, as MH -> MH.form -> LF.vmentry
156 __ verify_oop(recv);
157 __ load_heap_oop(method_temp, Address(recv, NONZERO(java_lang_invoke_MethodHandle::form_offset_in_bytes())));
158 __ verify_oop(method_temp);
159 __ load_heap_oop(method_temp, Address(method_temp, NONZERO(java_lang_invoke_LambdaForm::vmentry_offset_in_bytes())));
160 __ verify_oop(method_temp);
161 // the following assumes that a Method* is normally compressed in the vmtarget field:
162 __ movptr(method_temp, Address(method_temp, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes())));
163
164 if (VerifyMethodHandles && !for_compiler_entry) {
165 // make sure recv is already on stack
166 __ load_sized_value(temp2,
167 Address(method_temp, Method::size_of_parameters_offset()),
168 sizeof(u2), /*is_signed*/ false);
169 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), "");
170 Label L;
171 __ cmpptr(recv, __ argument_address(temp2, -1));
172 __ jcc(Assembler::equal, L);
173 __ movptr(rax, __ argument_address(temp2, -1));
174 __ STOP("receiver not on stack");
175 __ BIND(L);
176 }
177
178 jump_from_method_handle(_masm, method_temp, temp2, for_compiler_entry);
179 BLOCK_COMMENT("} jump_to_lambda_form");
180 }
181
182
183 // Code generation
184 address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm,
185 vmIntrinsics::ID iid) {
186 const bool not_for_compiler_entry = false; // this is the interpreter entry
187 assert(is_signature_polymorphic(iid), "expected invoke iid");
188 if (iid == vmIntrinsics::_invokeGeneric ||
189 iid == vmIntrinsics::_compiledLambdaForm) {
190 // Perhaps surprisingly, the symbolic references visible to Java are not directly used.
191 // They are linked to Java-generated adapters via MethodHandleNatives.linkMethod.
192 // They all allow an appendix argument.
193 __ hlt(); // empty stubs make SG sick
194 return NULL;
195 }
196
197 // rsi/r13: sender SP (must preserve; see prepare_to_jump_from_interpreted)
198 // rbx: Method*
199 // rdx: argument locator (parameter slot count, added to rsp)
200 // rcx: used as temp to hold mh or receiver
201 // rax, rdi: garbage temps, blown away
202 Register rdx_argp = rdx; // argument list ptr, live on error paths
203 Register rax_temp = rax;
204 Register rcx_mh = rcx; // MH receiver; dies quickly and is recycled
205 Register rbx_method = rbx; // eventual target of this invocation
206
207 // here's where control starts out:
208 __ align(CodeEntryAlignment);
209 address entry_point = __ pc();
210
211 if (VerifyMethodHandles) {
212 Label L;
213 BLOCK_COMMENT("verify_intrinsic_id {");
214 __ cmpb(Address(rbx_method, Method::intrinsic_id_offset_in_bytes()), (int) iid);
215 __ jcc(Assembler::equal, L);
216 if (iid == vmIntrinsics::_linkToVirtual ||
217 iid == vmIntrinsics::_linkToSpecial) {
218 // could do this for all kinds, but would explode assembly code size
219 trace_method_handle(_masm, "bad Method*::intrinsic_id");
220 }
221 __ STOP("bad Method*::intrinsic_id");
222 __ bind(L);
223 BLOCK_COMMENT("} verify_intrinsic_id");
224 }
225
226 // First task: Find out how big the argument list is.
227 Address rdx_first_arg_addr;
228 int ref_kind = signature_polymorphic_intrinsic_ref_kind(iid);
229 assert(ref_kind != 0 || iid == vmIntrinsics::_invokeBasic, "must be _invokeBasic or a linkTo intrinsic");
230 if (ref_kind == 0 || MethodHandles::ref_kind_has_receiver(ref_kind)) {
231 __ load_sized_value(rdx_argp,
232 Address(rbx_method, Method::size_of_parameters_offset()),
233 sizeof(u2), /*is_signed*/ false);
234 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), "");
235 rdx_first_arg_addr = __ argument_address(rdx_argp, -1);
236 } else {
237 DEBUG_ONLY(rdx_argp = noreg);
238 }
239
240 if (!is_signature_polymorphic_static(iid)) {
241 __ movptr(rcx_mh, rdx_first_arg_addr);
242 DEBUG_ONLY(rdx_argp = noreg);
243 }
244
245 // rdx_first_arg_addr is live!
246
247 trace_method_handle_interpreter_entry(_masm, iid);
248
249 if (iid == vmIntrinsics::_invokeBasic) {
250 generate_method_handle_dispatch(_masm, iid, rcx_mh, noreg, not_for_compiler_entry);
251
252 } else {
253 // Adjust argument list by popping the trailing MemberName argument.
254 Register rcx_recv = noreg;
255 if (MethodHandles::ref_kind_has_receiver(ref_kind)) {
256 // Load the receiver (not the MH; the actual MemberName's receiver) up from the interpreter stack.
257 __ movptr(rcx_recv = rcx, rdx_first_arg_addr);
258 }
259 DEBUG_ONLY(rdx_argp = noreg);
260 Register rbx_member = rbx_method; // MemberName ptr; incoming method ptr is dead now
261 __ pop(rax_temp); // return address
262 __ pop(rbx_member); // extract last argument
263 __ push(rax_temp); // re-push return address
264 generate_method_handle_dispatch(_masm, iid, rcx_recv, rbx_member, not_for_compiler_entry);
265 }
266
267 return entry_point;
268 }
269
270 void MethodHandles::generate_method_handle_dispatch(MacroAssembler* _masm,
271 vmIntrinsics::ID iid,
272 Register receiver_reg,
273 Register member_reg,
274 bool for_compiler_entry) {
275 assert(is_signature_polymorphic(iid), "expected invoke iid");
276 Register rbx_method = rbx; // eventual target of this invocation
277 // temps used in this code are not used in *either* compiled or interpreted calling sequences
278 #ifdef _LP64
279 Register temp1 = rscratch1;
280 Register temp2 = rscratch2;
281 Register temp3 = rax;
282 if (for_compiler_entry) {
283 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : j_rarg0), "only valid assignment");
284 assert_different_registers(temp1, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5);
285 assert_different_registers(temp2, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5);
286 assert_different_registers(temp3, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5);
287 }
288 #else
289 Register temp1 = (for_compiler_entry ? rsi : rdx);
290 Register temp2 = rdi;
291 Register temp3 = rax;
292 if (for_compiler_entry) {
293 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : rcx), "only valid assignment");
294 assert_different_registers(temp1, rcx, rdx);
295 assert_different_registers(temp2, rcx, rdx);
296 assert_different_registers(temp3, rcx, rdx);
297 }
298 #endif
299 else {
300 assert_different_registers(temp1, temp2, temp3, saved_last_sp_register()); // don't trash lastSP
301 }
302 assert_different_registers(temp1, temp2, temp3, receiver_reg);
303 assert_different_registers(temp1, temp2, temp3, member_reg);
304
305 if (iid == vmIntrinsics::_invokeBasic) {
306 // indirect through MH.form.vmentry.vmtarget
307 jump_to_lambda_form(_masm, receiver_reg, rbx_method, temp1, for_compiler_entry);
308
309 } else {
310 // The method is a member invoker used by direct method handles.
311 if (VerifyMethodHandles) {
312 // make sure the trailing argument really is a MemberName (caller responsibility)
313 verify_klass(_masm, member_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_invoke_MemberName),
314 "MemberName required for invokeVirtual etc.");
315 }
316
317 Address member_clazz( member_reg, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes()));
318 Address member_vmindex( member_reg, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes()));
319 Address member_vmtarget( member_reg, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes()));
320
321 Register temp1_recv_klass = temp1;
322 if (iid != vmIntrinsics::_linkToStatic) {
323 __ verify_oop(receiver_reg);
324 if (iid == vmIntrinsics::_linkToSpecial) {
325 // Don't actually load the klass; just null-check the receiver.
326 __ null_check(receiver_reg);
327 } else {
328 // load receiver klass itself
329 __ null_check(receiver_reg, oopDesc::klass_offset_in_bytes());
330 __ load_klass(temp1_recv_klass, receiver_reg);
331 __ verify_klass_ptr(temp1_recv_klass);
332 }
333 BLOCK_COMMENT("check_receiver {");
334 // The receiver for the MemberName must be in receiver_reg.
335 // Check the receiver against the MemberName.clazz
336 if (VerifyMethodHandles && iid == vmIntrinsics::_linkToSpecial) {
337 // Did not load it above...
338 __ load_klass(temp1_recv_klass, receiver_reg);
339 __ verify_klass_ptr(temp1_recv_klass);
340 }
341 if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) {
342 Label L_ok;
343 Register temp2_defc = temp2;
344 __ load_heap_oop(temp2_defc, member_clazz);
345 load_klass_from_Class(_masm, temp2_defc);
346 __ verify_klass_ptr(temp2_defc);
347 __ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, L_ok);
348 // If we get here, the type check failed!
349 __ STOP("receiver class disagrees with MemberName.clazz");
350 __ bind(L_ok);
351 }
352 BLOCK_COMMENT("} check_receiver");
353 }
354 if (iid == vmIntrinsics::_linkToSpecial ||
355 iid == vmIntrinsics::_linkToStatic) {
356 DEBUG_ONLY(temp1_recv_klass = noreg); // these guys didn't load the recv_klass
357 }
358
359 // Live registers at this point:
360 // member_reg - MemberName that was the trailing argument
361 // temp1_recv_klass - klass of stacked receiver, if needed
362 // rsi/r13 - interpreter linkage (if interpreted)
363 // rcx, rdx, rsi, rdi, r8, r8 - compiler arguments (if compiled)
364
365 Label L_incompatible_class_change_error;
366 switch (iid) {
367 case vmIntrinsics::_linkToSpecial:
368 if (VerifyMethodHandles) {
369 verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp3);
370 }
371 __ movptr(rbx_method, member_vmtarget);
372 break;
373
374 case vmIntrinsics::_linkToStatic:
375 if (VerifyMethodHandles) {
376 verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp3);
377 }
378 __ movptr(rbx_method, member_vmtarget);
379 break;
380
381 case vmIntrinsics::_linkToVirtual:
382 {
383 // same as TemplateTable::invokevirtual,
384 // minus the CP setup and profiling:
385
386 if (VerifyMethodHandles) {
387 verify_ref_kind(_masm, JVM_REF_invokeVirtual, member_reg, temp3);
388 }
389
390 // pick out the vtable index from the MemberName, and then we can discard it:
391 Register temp2_index = temp2;
392 __ movptr(temp2_index, member_vmindex);
393
394 if (VerifyMethodHandles) {
395 Label L_index_ok;
396 __ cmpl(temp2_index, 0);
397 __ jcc(Assembler::greaterEqual, L_index_ok);
398 __ STOP("no virtual index");
399 __ BIND(L_index_ok);
400 }
401
402 // Note: The verifier invariants allow us to ignore MemberName.clazz and vmtarget
403 // at this point. And VerifyMethodHandles has already checked clazz, if needed.
404
405 // get target Method* & entry point
406 __ lookup_virtual_method(temp1_recv_klass, temp2_index, rbx_method);
407 break;
408 }
409
410 case vmIntrinsics::_linkToInterface:
411 {
412 // same as TemplateTable::invokeinterface
413 // (minus the CP setup and profiling, with different argument motion)
414 if (VerifyMethodHandles) {
415 verify_ref_kind(_masm, JVM_REF_invokeInterface, member_reg, temp3);
416 }
417
418 Register temp3_intf = temp3;
419 __ load_heap_oop(temp3_intf, member_clazz);
420 load_klass_from_Class(_masm, temp3_intf);
421 __ verify_klass_ptr(temp3_intf);
422
423 Register rbx_index = rbx_method;
424 __ movptr(rbx_index, member_vmindex);
425 if (VerifyMethodHandles) {
426 Label L;
427 __ cmpl(rbx_index, 0);
428 __ jcc(Assembler::greaterEqual, L);
429 __ STOP("invalid vtable index for MH.invokeInterface");
430 __ bind(L);
431 }
432
433 // given intf, index, and recv klass, dispatch to the implementation method
434 __ lookup_interface_method(temp1_recv_klass, temp3_intf,
435 // note: next two args must be the same:
436 rbx_index, rbx_method,
437 temp2,
438 L_incompatible_class_change_error);
439 break;
440 }
441
442 default:
443 fatal(err_msg_res("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid)));
444 break;
445 }
446
447 // Live at this point:
448 // rbx_method
449 // rsi/r13 (if interpreted)
450
451 // After figuring out which concrete method to call, jump into it.
452 // Note that this works in the interpreter with no data motion.
453 // But the compiled version will require that rcx_recv be shifted out.
454 __ verify_method_ptr(rbx_method);
455 jump_from_method_handle(_masm, rbx_method, temp1, for_compiler_entry);
456
457 if (iid == vmIntrinsics::_linkToInterface) {
458 __ bind(L_incompatible_class_change_error);
459 __ jump(RuntimeAddress(StubRoutines::throw_IncompatibleClassChangeError_entry()));
460 }
461 }
462 }
463
464 #ifndef PRODUCT
465 void trace_method_handle_stub(const char* adaptername,
466 oop mh,
467 intptr_t* saved_regs,
468 intptr_t* entry_sp) {
469 // called as a leaf from native code: do not block the JVM!
470 bool has_mh = (strstr(adaptername, "/static") == NULL &&
471 strstr(adaptername, "linkTo") == NULL); // static linkers don't have MH
472 const char* mh_reg_name = has_mh ? "rcx_mh" : "rcx";
473 tty->print_cr("MH %s %s="PTR_FORMAT" sp="PTR_FORMAT,
474 adaptername, mh_reg_name,
475 mh, entry_sp);
476
477 if (Verbose) {
478 tty->print_cr("Registers:");
479 const int saved_regs_count = RegisterImpl::number_of_registers;
480 for (int i = 0; i < saved_regs_count; i++) {
481 Register r = as_Register(i);
482 // The registers are stored in reverse order on the stack (by pusha).
483 tty->print("%3s=" PTR_FORMAT, r->name(), saved_regs[((saved_regs_count - 1) - i)]);
484 if ((i + 1) % 4 == 0) {
485 tty->cr();
486 } else {
487 tty->print(", ");
488 }
489 }
490 tty->cr();
491
492 {
493 // dumping last frame with frame::describe
494
495 JavaThread* p = JavaThread::active();
496
497 ResourceMark rm;
498 PRESERVE_EXCEPTION_MARK; // may not be needed by safer and unexpensive here
499 FrameValues values;
500
501 // Note: We want to allow trace_method_handle from any call site.
502 // While trace_method_handle creates a frame, it may be entered
503 // without a PC on the stack top (e.g. not just after a call).
504 // Walking that frame could lead to failures due to that invalid PC.
505 // => carefully detect that frame when doing the stack walking
506
507 // Current C frame
508 frame cur_frame = os::current_frame();
509
510 // Robust search of trace_calling_frame (independant of inlining).
511 // Assumes saved_regs comes from a pusha in the trace_calling_frame.
512 assert(cur_frame.sp() < saved_regs, "registers not saved on stack ?");
513 frame trace_calling_frame = os::get_sender_for_C_frame(&cur_frame);
514 while (trace_calling_frame.fp() < saved_regs) {
515 trace_calling_frame = os::get_sender_for_C_frame(&trace_calling_frame);
516 }
517
518 // safely create a frame and call frame::describe
519 intptr_t *dump_sp = trace_calling_frame.sender_sp();
520 intptr_t *dump_fp = trace_calling_frame.link();
521
522 bool walkable = has_mh; // whether the traced frame shoud be walkable
523
524 if (walkable) {
525 // The previous definition of walkable may have to be refined
526 // if new call sites cause the next frame constructor to start
527 // failing. Alternatively, frame constructors could be
528 // modified to support the current or future non walkable
529 // frames (but this is more intrusive and is not considered as
530 // part of this RFE, which will instead use a simpler output).
531 frame dump_frame = frame(dump_sp, dump_fp);
532 dump_frame.describe(values, 1);
533 } else {
534 // Stack may not be walkable (invalid PC above FP):
535 // Add descriptions without building a Java frame to avoid issues
536 values.describe(-1, dump_fp, "fp for #1 <not parsed, cannot trust pc>");
537 values.describe(-1, dump_sp, "sp for #1");
538 }
539 values.describe(-1, entry_sp, "raw top of stack");
540
541 tty->print_cr("Stack layout:");
542 values.print(p);
543 }
544 if (has_mh && mh->is_oop()) {
545 mh->print();
546 if (java_lang_invoke_MethodHandle::is_instance(mh)) {
547 if (java_lang_invoke_MethodHandle::form_offset_in_bytes() != 0)
548 java_lang_invoke_MethodHandle::form(mh)->print();
549 }
550 }
551 }
552 }
553
554 // The stub wraps the arguments in a struct on the stack to avoid
555 // dealing with the different calling conventions for passing 6
556 // arguments.
557 struct MethodHandleStubArguments {
558 const char* adaptername;
559 oopDesc* mh;
560 intptr_t* saved_regs;
561 intptr_t* entry_sp;
562 };
563 void trace_method_handle_stub_wrapper(MethodHandleStubArguments* args) {
564 trace_method_handle_stub(args->adaptername,
565 args->mh,
566 args->saved_regs,
567 args->entry_sp);
568 }
569
570 void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) {
571 if (!TraceMethodHandles) return;
572 BLOCK_COMMENT("trace_method_handle {");
573 __ enter();
574 __ andptr(rsp, -16); // align stack if needed for FPU state
575 __ pusha();
576 __ mov(rbx, rsp); // for retreiving saved_regs
577 // Note: saved_regs must be in the entered frame for the
578 // robust stack walking implemented in trace_method_handle_stub.
579
580 // save FP result, valid at some call sites (adapter_opt_return_float, ...)
581 __ increment(rsp, -2 * wordSize);
582 if (UseSSE >= 2) {
583 __ movdbl(Address(rsp, 0), xmm0);
584 } else if (UseSSE == 1) {
585 __ movflt(Address(rsp, 0), xmm0);
586 } else {
587 __ fst_d(Address(rsp, 0));
588 }
589
590 // Incoming state:
591 // rcx: method handle
592 //
593 // To avoid calling convention issues, build a record on the stack
594 // and pass the pointer to that instead.
595 __ push(rbp); // entry_sp (with extra align space)
596 __ push(rbx); // pusha saved_regs
597 __ push(rcx); // mh
598 __ push(rcx); // slot for adaptername
599 __ movptr(Address(rsp, 0), (intptr_t) adaptername);
600 __ super_call_VM_leaf(CAST_FROM_FN_PTR(address, trace_method_handle_stub_wrapper), rsp);
601 __ increment(rsp, sizeof(MethodHandleStubArguments));
602
603 if (UseSSE >= 2) {
604 __ movdbl(xmm0, Address(rsp, 0));
605 } else if (UseSSE == 1) {
606 __ movflt(xmm0, Address(rsp, 0));
607 } else {
608 __ fld_d(Address(rsp, 0));
609 }
610 __ increment(rsp, 2 * wordSize);
611
612 __ popa();
613 __ leave();
614 BLOCK_COMMENT("} trace_method_handle");
615 }
616 #endif //PRODUCT