1 /*
2 * Copyright (c) 1997, 2018, 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 "jvm.h"
27 #include "asm/macroAssembler.hpp"
28 #include "compiler/disassembler.hpp"
29 #include "classfile/javaClasses.inline.hpp"
30 #include "interpreter/interpreter.hpp"
31 #include "interpreter/interpreterRuntime.hpp"
32 #include "memory/allocation.inline.hpp"
33 #include "memory/resourceArea.hpp"
34 #include "prims/methodHandles.hpp"
35 #include "runtime/flags/flagSetting.hpp"
36 #include "runtime/frame.inline.hpp"
37 #include "utilities/preserveException.hpp"
38
39 #define __ Disassembler::hook<MacroAssembler>(__FILE__, __LINE__, _masm)->
40
41 #ifdef PRODUCT
42 #define BLOCK_COMMENT(str) /* nothing */
43 #define STOP(error) stop(error)
44 #else
45 #define BLOCK_COMMENT(str) __ block_comment(str)
46 #define STOP(error) block_comment(error); __ stop(error)
47 #endif
48
49 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":")
50
51 void MethodHandles::load_klass_from_Class(MacroAssembler* _masm, Register klass_reg) {
52 if (VerifyMethodHandles)
53 verify_klass(_masm, klass_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_Class),
54 "MH argument is a Class");
55 __ movptr(klass_reg, Address(klass_reg, java_lang_Class::klass_offset_in_bytes()));
56 }
57
58 #ifdef ASSERT
59 static int check_nonzero(const char* xname, int x) {
60 assert(x != 0, "%s should be nonzero", xname);
61 return x;
62 }
63 #define NONZERO(x) check_nonzero(#x, x)
64 #else //ASSERT
65 #define NONZERO(x) (x)
66 #endif //ASSERT
67
68 #ifdef ASSERT
69 void MethodHandles::verify_klass(MacroAssembler* _masm,
70 Register obj, SystemDictionary::WKID klass_id,
71 const char* error_message) {
72 InstanceKlass** klass_addr = SystemDictionary::well_known_klass_addr(klass_id);
73 Klass* klass = SystemDictionary::well_known_klass(klass_id);
74 Register temp = rdi;
75 Register temp2 = noreg;
76 LP64_ONLY(temp2 = rscratch1); // used by MacroAssembler::cmpptr
77 Label L_ok, L_bad;
78 BLOCK_COMMENT("verify_klass {");
79 __ verify_oop(obj);
80 __ testptr(obj, obj);
81 __ jcc(Assembler::zero, L_bad);
82 __ push(temp); if (temp2 != noreg) __ push(temp2);
83 #define UNPUSH { if (temp2 != noreg) __ pop(temp2); __ pop(temp); }
84 __ load_klass(temp, obj);
85 __ cmpptr(temp, ExternalAddress((address) klass_addr));
86 __ jcc(Assembler::equal, L_ok);
87 intptr_t super_check_offset = klass->super_check_offset();
88 __ movptr(temp, Address(temp, super_check_offset));
89 __ cmpptr(temp, ExternalAddress((address) klass_addr));
90 __ jcc(Assembler::equal, L_ok);
91 UNPUSH;
92 __ bind(L_bad);
93 __ STOP(error_message);
94 __ BIND(L_ok);
95 UNPUSH;
96 BLOCK_COMMENT("} verify_klass");
97 }
98
99 void MethodHandles::verify_ref_kind(MacroAssembler* _masm, int ref_kind, Register member_reg, Register temp) {
100 Label L;
101 BLOCK_COMMENT("verify_ref_kind {");
102 __ movl(temp, Address(member_reg, NONZERO(java_lang_invoke_MemberName::flags_offset_in_bytes())));
103 __ shrl(temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT);
104 __ andl(temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK);
105 __ cmpl(temp, ref_kind);
106 __ jcc(Assembler::equal, L);
107 { char* buf = NEW_C_HEAP_ARRAY(char, 100, mtInternal);
108 jio_snprintf(buf, 100, "verify_ref_kind expected %x", ref_kind);
109 if (ref_kind == JVM_REF_invokeVirtual ||
110 ref_kind == JVM_REF_invokeSpecial)
111 // could do this for all ref_kinds, but would explode assembly code size
112 trace_method_handle(_masm, buf);
113 __ STOP(buf);
114 }
115 BLOCK_COMMENT("} verify_ref_kind");
116 __ bind(L);
117 }
118
119 #endif //ASSERT
120
121 void MethodHandles::jump_from_method_handle(MacroAssembler* _masm, Register method, Register temp,
122 bool for_compiler_entry) {
123 assert(method == rbx, "interpreter calling convention");
124
125 Label L_no_such_method;
126 __ testptr(rbx, rbx);
127 __ jcc(Assembler::zero, L_no_such_method);
128
129 __ verify_method_ptr(method);
130
131 if (!for_compiler_entry && JvmtiExport::can_post_interpreter_events()) {
132 Label run_compiled_code;
133 // JVMTI events, such as single-stepping, are implemented partly by avoiding running
134 // compiled code in threads for which the event is enabled. Check here for
135 // interp_only_mode if these events CAN be enabled.
136 #ifdef _LP64
137 Register rthread = r15_thread;
138 #else
139 Register rthread = temp;
140 __ get_thread(rthread);
141 #endif
142 // interp_only is an int, on little endian it is sufficient to test the byte only
143 // Is a cmpl faster?
144 __ cmpb(Address(rthread, JavaThread::interp_only_mode_offset()), 0);
145 __ jccb(Assembler::zero, run_compiled_code);
146 __ jmp(Address(method, Method::interpreter_entry_offset()));
147 __ BIND(run_compiled_code);
148 }
149
150 // The following jump might pass a value type argument that was erased to Object as oop to a
151 // callee that expects value type arguments to be passed as fields. We need to call the compiled
152 // value entry (_code->value_entry_point() or _adapter->c2i_value_entry()) which will take care
153 // of translating between the calling conventions.
154 const ByteSize entry_offset = for_compiler_entry ? Method::from_compiled_value_offset() :
155 Method::from_interpreted_offset();
156 __ jmp(Address(method, entry_offset));
157
158 __ bind(L_no_such_method);
159 __ jump(RuntimeAddress(StubRoutines::throw_AbstractMethodError_entry()));
160 }
161
162 void MethodHandles::jump_to_lambda_form(MacroAssembler* _masm,
163 Register recv, Register method_temp,
164 Register temp2,
165 bool for_compiler_entry) {
166 BLOCK_COMMENT("jump_to_lambda_form {");
167 // This is the initial entry point of a lazy method handle.
168 // After type checking, it picks up the invoker from the LambdaForm.
169 assert_different_registers(recv, method_temp, temp2);
170 assert(recv != noreg, "required register");
171 assert(method_temp == rbx, "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(method_temp, Address(recv, NONZERO(java_lang_invoke_MethodHandle::form_offset_in_bytes())), temp2);
178 __ verify_oop(method_temp);
179 __ load_heap_oop(method_temp, Address(method_temp, NONZERO(java_lang_invoke_LambdaForm::vmentry_offset_in_bytes())), temp2);
180 __ verify_oop(method_temp);
181 __ load_heap_oop(method_temp, Address(method_temp, NONZERO(java_lang_invoke_MemberName::method_offset_in_bytes())), temp2);
182 __ verify_oop(method_temp);
183 __ access_load_at(T_ADDRESS, IN_HEAP, method_temp,
184 Address(method_temp, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset_in_bytes())),
185 noreg, noreg);
186
187 if (VerifyMethodHandles && !for_compiler_entry) {
188 // make sure recv is already on stack
189 __ movptr(temp2, Address(method_temp, Method::const_offset()));
190 __ load_sized_value(temp2,
191 Address(temp2, ConstMethod::size_of_parameters_offset()),
192 sizeof(u2), /*is_signed*/ false);
193 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), "");
194 Label L;
195 __ cmpoop(recv, __ argument_address(temp2, -1));
196 __ jcc(Assembler::equal, L);
197 __ movptr(rax, __ argument_address(temp2, -1));
198 __ STOP("receiver not on stack");
199 __ BIND(L);
200 }
201
202 jump_from_method_handle(_masm, method_temp, temp2, for_compiler_entry);
203 BLOCK_COMMENT("} jump_to_lambda_form");
204 }
205
206
207 // Code generation
208 address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm,
209 vmIntrinsics::ID iid) {
210 const bool not_for_compiler_entry = false; // this is the interpreter entry
211 assert(is_signature_polymorphic(iid), "expected invoke iid");
212 if (iid == vmIntrinsics::_invokeGeneric ||
213 iid == vmIntrinsics::_compiledLambdaForm) {
214 // Perhaps surprisingly, the symbolic references visible to Java are not directly used.
215 // They are linked to Java-generated adapters via MethodHandleNatives.linkMethod.
216 // They all allow an appendix argument.
217 __ hlt(); // empty stubs make SG sick
218 return NULL;
219 }
220
221 // rsi/r13: sender SP (must preserve; see prepare_to_jump_from_interpreted)
222 // rbx: Method*
223 // rdx: argument locator (parameter slot count, added to rsp)
224 // rcx: used as temp to hold mh or receiver
225 // rax, rdi: garbage temps, blown away
226 Register rdx_argp = rdx; // argument list ptr, live on error paths
227 Register rax_temp = rax;
228 Register rcx_mh = rcx; // MH receiver; dies quickly and is recycled
229 Register rbx_method = rbx; // eventual target of this invocation
230
231 // here's where control starts out:
232 __ align(CodeEntryAlignment);
233 address entry_point = __ pc();
234
235 if (VerifyMethodHandles) {
236 assert(Method::intrinsic_id_size_in_bytes() == 2, "assuming Method::_intrinsic_id is u2");
237
238 Label L;
239 BLOCK_COMMENT("verify_intrinsic_id {");
240 __ cmpw(Address(rbx_method, Method::intrinsic_id_offset_in_bytes()), (int) iid);
241 __ jcc(Assembler::equal, L);
242 if (iid == vmIntrinsics::_linkToVirtual ||
243 iid == vmIntrinsics::_linkToSpecial) {
244 // could do this for all kinds, but would explode assembly code size
245 trace_method_handle(_masm, "bad Method*::intrinsic_id");
246 }
247 __ STOP("bad Method*::intrinsic_id");
248 __ bind(L);
249 BLOCK_COMMENT("} verify_intrinsic_id");
250 }
251
252 // First task: Find out how big the argument list is.
253 Address rdx_first_arg_addr;
254 int ref_kind = signature_polymorphic_intrinsic_ref_kind(iid);
255 assert(ref_kind != 0 || iid == vmIntrinsics::_invokeBasic, "must be _invokeBasic or a linkTo intrinsic");
256 if (ref_kind == 0 || MethodHandles::ref_kind_has_receiver(ref_kind)) {
257 __ movptr(rdx_argp, Address(rbx_method, Method::const_offset()));
258 __ load_sized_value(rdx_argp,
259 Address(rdx_argp, ConstMethod::size_of_parameters_offset()),
260 sizeof(u2), /*is_signed*/ false);
261 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), "");
262 rdx_first_arg_addr = __ argument_address(rdx_argp, -1);
263 } else {
264 DEBUG_ONLY(rdx_argp = noreg);
265 }
266
267 if (!is_signature_polymorphic_static(iid)) {
268 __ movptr(rcx_mh, rdx_first_arg_addr);
269 DEBUG_ONLY(rdx_argp = noreg);
270 }
271
272 // rdx_first_arg_addr is live!
273
274 trace_method_handle_interpreter_entry(_masm, iid);
275
276 if (iid == vmIntrinsics::_invokeBasic) {
277 generate_method_handle_dispatch(_masm, iid, rcx_mh, noreg, not_for_compiler_entry);
278
279 } else {
280 // Adjust argument list by popping the trailing MemberName argument.
281 Register rcx_recv = noreg;
282 if (MethodHandles::ref_kind_has_receiver(ref_kind)) {
283 // Load the receiver (not the MH; the actual MemberName's receiver) up from the interpreter stack.
284 __ movptr(rcx_recv = rcx, rdx_first_arg_addr);
285 }
286 DEBUG_ONLY(rdx_argp = noreg);
287 Register rbx_member = rbx_method; // MemberName ptr; incoming method ptr is dead now
288 __ pop(rax_temp); // return address
289 __ pop(rbx_member); // extract last argument
290 __ push(rax_temp); // re-push return address
291 generate_method_handle_dispatch(_masm, iid, rcx_recv, rbx_member, not_for_compiler_entry);
292 }
293
294 return entry_point;
295 }
296
297 void MethodHandles::generate_method_handle_dispatch(MacroAssembler* _masm,
298 vmIntrinsics::ID iid,
299 Register receiver_reg,
300 Register member_reg,
301 bool for_compiler_entry) {
302 assert(is_signature_polymorphic(iid), "expected invoke iid");
303 Register rbx_method = rbx; // eventual target of this invocation
304 // temps used in this code are not used in *either* compiled or interpreted calling sequences
305 #ifdef _LP64
306 Register temp1 = rscratch1;
307 Register temp2 = rscratch2;
308 Register temp3 = rax;
309 if (for_compiler_entry) {
310 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : j_rarg0), "only valid assignment");
311 assert_different_registers(temp1, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5);
312 assert_different_registers(temp2, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5);
313 assert_different_registers(temp3, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5);
314 }
315 #else
316 Register temp1 = (for_compiler_entry ? rsi : rdx);
317 Register temp2 = rdi;
318 Register temp3 = rax;
319 if (for_compiler_entry) {
320 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : rcx), "only valid assignment");
321 assert_different_registers(temp1, rcx, rdx);
322 assert_different_registers(temp2, rcx, rdx);
323 assert_different_registers(temp3, rcx, rdx);
324 }
325 #endif
326 else {
327 assert_different_registers(temp1, temp2, temp3, saved_last_sp_register()); // don't trash lastSP
328 }
329 assert_different_registers(temp1, temp2, temp3, receiver_reg);
330 assert_different_registers(temp1, temp2, temp3, member_reg);
331
332 if (iid == vmIntrinsics::_invokeBasic) {
333 // indirect through MH.form.vmentry.vmtarget
334 jump_to_lambda_form(_masm, receiver_reg, rbx_method, temp1, for_compiler_entry);
335
336 } else {
337 // The method is a member invoker used by direct method handles.
338 if (VerifyMethodHandles) {
339 // make sure the trailing argument really is a MemberName (caller responsibility)
340 verify_klass(_masm, member_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_invoke_MemberName),
341 "MemberName required for invokeVirtual etc.");
342 }
343
344 Address member_clazz( member_reg, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes()));
345 Address member_vmindex( member_reg, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes()));
346 Address member_vmtarget( member_reg, NONZERO(java_lang_invoke_MemberName::method_offset_in_bytes()));
347 Address vmtarget_method( rbx_method, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset_in_bytes()));
348
349 Register temp1_recv_klass = temp1;
350 if (iid != vmIntrinsics::_linkToStatic) {
351 __ verify_oop(receiver_reg);
352 if (iid == vmIntrinsics::_linkToSpecial) {
353 // Don't actually load the klass; just null-check the receiver.
354 __ null_check(receiver_reg);
355 } else {
356 // load receiver klass itself
357 __ null_check(receiver_reg, oopDesc::klass_offset_in_bytes());
358 __ load_klass(temp1_recv_klass, receiver_reg);
359 __ verify_klass_ptr(temp1_recv_klass);
360 }
361 BLOCK_COMMENT("check_receiver {");
362 // The receiver for the MemberName must be in receiver_reg.
363 // Check the receiver against the MemberName.clazz
364 if (VerifyMethodHandles && iid == vmIntrinsics::_linkToSpecial) {
365 // Did not load it above...
366 __ load_klass(temp1_recv_klass, receiver_reg);
367 __ verify_klass_ptr(temp1_recv_klass);
368 }
369 if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) {
370 Label L_ok;
371 Register temp2_defc = temp2;
372 __ load_heap_oop(temp2_defc, member_clazz, temp3);
373 load_klass_from_Class(_masm, temp2_defc);
374 __ verify_klass_ptr(temp2_defc);
375 __ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, L_ok);
376 // If we get here, the type check failed!
377 __ STOP("receiver class disagrees with MemberName.clazz");
378 __ bind(L_ok);
379 }
380 BLOCK_COMMENT("} check_receiver");
381 }
382 if (iid == vmIntrinsics::_linkToSpecial ||
383 iid == vmIntrinsics::_linkToStatic) {
384 DEBUG_ONLY(temp1_recv_klass = noreg); // these guys didn't load the recv_klass
385 }
386
387 // Live registers at this point:
388 // member_reg - MemberName that was the trailing argument
389 // temp1_recv_klass - klass of stacked receiver, if needed
390 // rsi/r13 - interpreter linkage (if interpreted)
391 // rcx, rdx, rsi, rdi, r8 - compiler arguments (if compiled)
392
393 Label L_incompatible_class_change_error;
394 switch (iid) {
395 case vmIntrinsics::_linkToSpecial:
396 if (VerifyMethodHandles) {
397 verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp3);
398 }
399 __ load_heap_oop(rbx_method, member_vmtarget);
400 __ access_load_at(T_ADDRESS, IN_HEAP, rbx_method, vmtarget_method, noreg, noreg);
401 break;
402
403 case vmIntrinsics::_linkToStatic:
404 if (VerifyMethodHandles) {
405 verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp3);
406 }
407 __ load_heap_oop(rbx_method, member_vmtarget);
408 __ access_load_at(T_ADDRESS, IN_HEAP, rbx_method, vmtarget_method, noreg, noreg);
409 break;
410
411 case vmIntrinsics::_linkToVirtual:
412 {
413 // same as TemplateTable::invokevirtual,
414 // minus the CP setup and profiling:
415
416 if (VerifyMethodHandles) {
417 verify_ref_kind(_masm, JVM_REF_invokeVirtual, member_reg, temp3);
418 }
419
420 // pick out the vtable index from the MemberName, and then we can discard it:
421 Register temp2_index = temp2;
422 __ access_load_at(T_ADDRESS, IN_HEAP, temp2_index, member_vmindex, noreg, noreg);
423
424 if (VerifyMethodHandles) {
425 Label L_index_ok;
426 __ cmpl(temp2_index, 0);
427 __ jcc(Assembler::greaterEqual, L_index_ok);
428 __ STOP("no virtual index");
429 __ BIND(L_index_ok);
430 }
431
432 // Note: The verifier invariants allow us to ignore MemberName.clazz and vmtarget
433 // at this point. And VerifyMethodHandles has already checked clazz, if needed.
434
435 // get target Method* & entry point
436 __ lookup_virtual_method(temp1_recv_klass, temp2_index, rbx_method);
437 break;
438 }
439
440 case vmIntrinsics::_linkToInterface:
441 {
442 // same as TemplateTable::invokeinterface
443 // (minus the CP setup and profiling, with different argument motion)
444 if (VerifyMethodHandles) {
445 verify_ref_kind(_masm, JVM_REF_invokeInterface, member_reg, temp3);
446 }
447
448 Register temp3_intf = temp3;
449 __ load_heap_oop(temp3_intf, member_clazz);
450 load_klass_from_Class(_masm, temp3_intf);
451 __ verify_klass_ptr(temp3_intf);
452
453 Register rbx_index = rbx_method;
454 __ access_load_at(T_ADDRESS, IN_HEAP, rbx_index, member_vmindex, noreg, noreg);
455 if (VerifyMethodHandles) {
456 Label L;
457 __ cmpl(rbx_index, 0);
458 __ jcc(Assembler::greaterEqual, L);
459 __ STOP("invalid vtable index for MH.invokeInterface");
460 __ bind(L);
461 }
462
463 // given intf, index, and recv klass, dispatch to the implementation method
464 __ lookup_interface_method(temp1_recv_klass, temp3_intf,
465 // note: next two args must be the same:
466 rbx_index, rbx_method,
467 temp2,
468 L_incompatible_class_change_error);
469 break;
470 }
471
472 default:
473 fatal("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid));
474 break;
475 }
476
477 // Live at this point:
478 // rbx_method
479 // rsi/r13 (if interpreted)
480
481 // After figuring out which concrete method to call, jump into it.
482 // Note that this works in the interpreter with no data motion.
483 // But the compiled version will require that rcx_recv be shifted out.
484 __ verify_method_ptr(rbx_method);
485 jump_from_method_handle(_masm, rbx_method, temp1, for_compiler_entry);
486
487 if (iid == vmIntrinsics::_linkToInterface) {
488 __ bind(L_incompatible_class_change_error);
489 __ jump(RuntimeAddress(StubRoutines::throw_IncompatibleClassChangeError_entry()));
490 }
491 }
492 }
493
494 #ifndef PRODUCT
495 void trace_method_handle_stub(const char* adaptername,
496 oop mh,
497 intptr_t* saved_regs,
498 intptr_t* entry_sp) {
499 // called as a leaf from native code: do not block the JVM!
500 bool has_mh = (strstr(adaptername, "/static") == NULL &&
501 strstr(adaptername, "linkTo") == NULL); // static linkers don't have MH
502 const char* mh_reg_name = has_mh ? "rcx_mh" : "rcx";
503 tty->print_cr("MH %s %s=" PTR_FORMAT " sp=" PTR_FORMAT,
504 adaptername, mh_reg_name,
505 p2i(mh), p2i(entry_sp));
506
507 if (Verbose) {
508 tty->print_cr("Registers:");
509 const int saved_regs_count = RegisterImpl::number_of_registers;
510 for (int i = 0; i < saved_regs_count; i++) {
511 Register r = as_Register(i);
512 // The registers are stored in reverse order on the stack (by pusha).
513 tty->print("%3s=" PTR_FORMAT, r->name(), saved_regs[((saved_regs_count - 1) - i)]);
514 if ((i + 1) % 4 == 0) {
515 tty->cr();
516 } else {
517 tty->print(", ");
518 }
519 }
520 tty->cr();
521
522 {
523 // dumping last frame with frame::describe
524
525 JavaThread* p = JavaThread::active();
526
527 ResourceMark rm;
528 PRESERVE_EXCEPTION_MARK; // may not be needed by safer and unexpensive here
529 FrameValues values;
530
531 // Note: We want to allow trace_method_handle from any call site.
532 // While trace_method_handle creates a frame, it may be entered
533 // without a PC on the stack top (e.g. not just after a call).
534 // Walking that frame could lead to failures due to that invalid PC.
535 // => carefully detect that frame when doing the stack walking
536
537 // Current C frame
538 frame cur_frame = os::current_frame();
539
540 // Robust search of trace_calling_frame (independant of inlining).
541 // Assumes saved_regs comes from a pusha in the trace_calling_frame.
542 assert(cur_frame.sp() < saved_regs, "registers not saved on stack ?");
543 frame trace_calling_frame = os::get_sender_for_C_frame(&cur_frame);
544 while (trace_calling_frame.fp() < saved_regs) {
545 trace_calling_frame = os::get_sender_for_C_frame(&trace_calling_frame);
546 }
547
548 // safely create a frame and call frame::describe
549 intptr_t *dump_sp = trace_calling_frame.sender_sp();
550 intptr_t *dump_fp = trace_calling_frame.link();
551
552 bool walkable = has_mh; // whether the traced frame shoud be walkable
553
554 if (walkable) {
555 // The previous definition of walkable may have to be refined
556 // if new call sites cause the next frame constructor to start
557 // failing. Alternatively, frame constructors could be
558 // modified to support the current or future non walkable
559 // frames (but this is more intrusive and is not considered as
560 // part of this RFE, which will instead use a simpler output).
561 frame dump_frame = frame(dump_sp, dump_fp);
562 dump_frame.describe(values, 1);
563 } else {
564 // Stack may not be walkable (invalid PC above FP):
565 // Add descriptions without building a Java frame to avoid issues
566 values.describe(-1, dump_fp, "fp for #1 <not parsed, cannot trust pc>");
567 values.describe(-1, dump_sp, "sp for #1");
568 }
569 values.describe(-1, entry_sp, "raw top of stack");
570
571 tty->print_cr("Stack layout:");
572 values.print(p);
573 }
574 if (has_mh && oopDesc::is_oop(mh)) {
575 mh->print();
576 if (java_lang_invoke_MethodHandle::is_instance(mh)) {
577 if (java_lang_invoke_MethodHandle::form_offset_in_bytes() != 0)
578 java_lang_invoke_MethodHandle::form(mh)->print();
579 }
580 }
581 }
582 }
583
584 // The stub wraps the arguments in a struct on the stack to avoid
585 // dealing with the different calling conventions for passing 6
586 // arguments.
587 struct MethodHandleStubArguments {
588 const char* adaptername;
589 oopDesc* mh;
590 intptr_t* saved_regs;
591 intptr_t* entry_sp;
592 };
593 void trace_method_handle_stub_wrapper(MethodHandleStubArguments* args) {
594 trace_method_handle_stub(args->adaptername,
595 args->mh,
596 args->saved_regs,
597 args->entry_sp);
598 }
599
600 void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) {
601 if (!TraceMethodHandles) return;
602 BLOCK_COMMENT(err_msg("trace_method_handle %s {", adaptername));
603 __ enter();
604 __ andptr(rsp, -16); // align stack if needed for FPU state
605 __ pusha();
606 __ mov(rbx, rsp); // for retreiving saved_regs
607 // Note: saved_regs must be in the entered frame for the
608 // robust stack walking implemented in trace_method_handle_stub.
609
610 // save FP result, valid at some call sites (adapter_opt_return_float, ...)
611 __ increment(rsp, -2 * wordSize);
612 if (UseSSE >= 2) {
613 __ movdbl(Address(rsp, 0), xmm0);
614 } else if (UseSSE == 1) {
615 __ movflt(Address(rsp, 0), xmm0);
616 } else {
617 __ fst_d(Address(rsp, 0));
618 }
619
620 // Incoming state:
621 // rcx: method handle
622 //
623 // To avoid calling convention issues, build a record on the stack
624 // and pass the pointer to that instead.
625 __ push(rbp); // entry_sp (with extra align space)
626 __ push(rbx); // pusha saved_regs
627 __ push(rcx); // mh
628 __ push(rcx); // slot for adaptername
629 __ movptr(Address(rsp, 0), (intptr_t) adaptername);
630 __ super_call_VM_leaf(CAST_FROM_FN_PTR(address, trace_method_handle_stub_wrapper), rsp);
631 __ increment(rsp, sizeof(MethodHandleStubArguments));
632
633 if (UseSSE >= 2) {
634 __ movdbl(xmm0, Address(rsp, 0));
635 } else if (UseSSE == 1) {
636 __ movflt(xmm0, Address(rsp, 0));
637 } else {
638 __ fld_d(Address(rsp, 0));
639 }
640 __ increment(rsp, 2 * wordSize);
641
642 __ popa();
643 __ leave();
644 BLOCK_COMMENT("} trace_method_handle");
645 }
646 #endif //PRODUCT