Tue, 02 Sep 2014 12:48:45 -0700
8055494: Add C2 x86 intrinsic for BigInteger::multiplyToLen() method
Summary: Add new C2 intrinsic for BigInteger::multiplyToLen() on x86 in 64-bit VM.
Reviewed-by: roland
1 /*
2 * Copyright (c) 1997, 2014, 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 */
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"
32 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
34 #define __ _masm->
36 #ifdef PRODUCT
37 #define BLOCK_COMMENT(str) /* nothing */
38 #define STOP(error) stop(error)
39 #else
40 #define BLOCK_COMMENT(str) __ block_comment(str)
41 #define STOP(error) block_comment(error); __ stop(error)
42 #endif
44 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":")
46 void MethodHandles::load_klass_from_Class(MacroAssembler* _masm, Register klass_reg) {
47 if (VerifyMethodHandles)
48 verify_klass(_masm, klass_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_Class),
49 "MH argument is a Class");
50 __ movptr(klass_reg, Address(klass_reg, java_lang_Class::klass_offset_in_bytes()));
51 }
53 #ifdef ASSERT
54 static int check_nonzero(const char* xname, int x) {
55 assert(x != 0, err_msg("%s should be nonzero", xname));
56 return x;
57 }
58 #define NONZERO(x) check_nonzero(#x, x)
59 #else //ASSERT
60 #define NONZERO(x) (x)
61 #endif //ASSERT
63 #ifdef ASSERT
64 void MethodHandles::verify_klass(MacroAssembler* _masm,
65 Register obj, SystemDictionary::WKID klass_id,
66 const char* error_message) {
67 Klass** klass_addr = SystemDictionary::well_known_klass_addr(klass_id);
68 KlassHandle klass = SystemDictionary::well_known_klass(klass_id);
69 Register temp = rdi;
70 Register temp2 = noreg;
71 LP64_ONLY(temp2 = rscratch1); // used by MacroAssembler::cmpptr
72 Label L_ok, L_bad;
73 BLOCK_COMMENT("verify_klass {");
74 __ verify_oop(obj);
75 __ testptr(obj, obj);
76 __ jcc(Assembler::zero, L_bad);
77 __ push(temp); if (temp2 != noreg) __ push(temp2);
78 #define UNPUSH { if (temp2 != noreg) __ pop(temp2); __ pop(temp); }
79 __ load_klass(temp, obj);
80 __ cmpptr(temp, ExternalAddress((address) klass_addr));
81 __ jcc(Assembler::equal, L_ok);
82 intptr_t super_check_offset = klass->super_check_offset();
83 __ movptr(temp, Address(temp, super_check_offset));
84 __ cmpptr(temp, ExternalAddress((address) klass_addr));
85 __ jcc(Assembler::equal, L_ok);
86 UNPUSH;
87 __ bind(L_bad);
88 __ STOP(error_message);
89 __ BIND(L_ok);
90 UNPUSH;
91 BLOCK_COMMENT("} verify_klass");
92 }
94 void MethodHandles::verify_ref_kind(MacroAssembler* _masm, int ref_kind, Register member_reg, Register temp) {
95 Label L;
96 BLOCK_COMMENT("verify_ref_kind {");
97 __ movl(temp, Address(member_reg, NONZERO(java_lang_invoke_MemberName::flags_offset_in_bytes())));
98 __ shrl(temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT);
99 __ andl(temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK);
100 __ cmpl(temp, ref_kind);
101 __ jcc(Assembler::equal, L);
102 { char* buf = NEW_C_HEAP_ARRAY(char, 100, mtInternal);
103 jio_snprintf(buf, 100, "verify_ref_kind expected %x", ref_kind);
104 if (ref_kind == JVM_REF_invokeVirtual ||
105 ref_kind == JVM_REF_invokeSpecial)
106 // could do this for all ref_kinds, but would explode assembly code size
107 trace_method_handle(_masm, buf);
108 __ STOP(buf);
109 }
110 BLOCK_COMMENT("} verify_ref_kind");
111 __ bind(L);
112 }
114 #endif //ASSERT
116 void MethodHandles::jump_from_method_handle(MacroAssembler* _masm, Register method, Register temp,
117 bool for_compiler_entry) {
118 assert(method == rbx, "interpreter calling convention");
120 Label L_no_such_method;
121 __ testptr(rbx, rbx);
122 __ jcc(Assembler::zero, L_no_such_method);
124 __ verify_method_ptr(method);
126 if (!for_compiler_entry && JvmtiExport::can_post_interpreter_events()) {
127 Label run_compiled_code;
128 // JVMTI events, such as single-stepping, are implemented partly by avoiding running
129 // compiled code in threads for which the event is enabled. Check here for
130 // interp_only_mode if these events CAN be enabled.
131 #ifdef _LP64
132 Register rthread = r15_thread;
133 #else
134 Register rthread = temp;
135 __ get_thread(rthread);
136 #endif
137 // interp_only is an int, on little endian it is sufficient to test the byte only
138 // Is a cmpl faster?
139 __ cmpb(Address(rthread, JavaThread::interp_only_mode_offset()), 0);
140 __ jccb(Assembler::zero, run_compiled_code);
141 __ jmp(Address(method, Method::interpreter_entry_offset()));
142 __ BIND(run_compiled_code);
143 }
145 const ByteSize entry_offset = for_compiler_entry ? Method::from_compiled_offset() :
146 Method::from_interpreted_offset();
147 __ jmp(Address(method, entry_offset));
149 __ bind(L_no_such_method);
150 __ jump(RuntimeAddress(StubRoutines::throw_AbstractMethodError_entry()));
151 }
153 void MethodHandles::jump_to_lambda_form(MacroAssembler* _masm,
154 Register recv, Register method_temp,
155 Register temp2,
156 bool for_compiler_entry) {
157 BLOCK_COMMENT("jump_to_lambda_form {");
158 // This is the initial entry point of a lazy method handle.
159 // After type checking, it picks up the invoker from the LambdaForm.
160 assert_different_registers(recv, method_temp, temp2);
161 assert(recv != noreg, "required register");
162 assert(method_temp == rbx, "required register for loading method");
164 //NOT_PRODUCT({ FlagSetting fs(TraceMethodHandles, true); trace_method_handle(_masm, "LZMH"); });
166 // Load the invoker, as MH -> MH.form -> LF.vmentry
167 __ verify_oop(recv);
168 __ load_heap_oop(method_temp, Address(recv, NONZERO(java_lang_invoke_MethodHandle::form_offset_in_bytes())));
169 __ verify_oop(method_temp);
170 __ load_heap_oop(method_temp, Address(method_temp, NONZERO(java_lang_invoke_LambdaForm::vmentry_offset_in_bytes())));
171 __ verify_oop(method_temp);
172 // the following assumes that a Method* is normally compressed in the vmtarget field:
173 __ movptr(method_temp, Address(method_temp, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes())));
175 if (VerifyMethodHandles && !for_compiler_entry) {
176 // make sure recv is already on stack
177 __ movptr(temp2, Address(method_temp, Method::const_offset()));
178 __ load_sized_value(temp2,
179 Address(temp2, ConstMethod::size_of_parameters_offset()),
180 sizeof(u2), /*is_signed*/ false);
181 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), "");
182 Label L;
183 __ cmpptr(recv, __ argument_address(temp2, -1));
184 __ jcc(Assembler::equal, L);
185 __ movptr(rax, __ argument_address(temp2, -1));
186 __ STOP("receiver not on stack");
187 __ BIND(L);
188 }
190 jump_from_method_handle(_masm, method_temp, temp2, for_compiler_entry);
191 BLOCK_COMMENT("} jump_to_lambda_form");
192 }
195 // Code generation
196 address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm,
197 vmIntrinsics::ID iid) {
198 const bool not_for_compiler_entry = false; // this is the interpreter entry
199 assert(is_signature_polymorphic(iid), "expected invoke iid");
200 if (iid == vmIntrinsics::_invokeGeneric ||
201 iid == vmIntrinsics::_compiledLambdaForm) {
202 // Perhaps surprisingly, the symbolic references visible to Java are not directly used.
203 // They are linked to Java-generated adapters via MethodHandleNatives.linkMethod.
204 // They all allow an appendix argument.
205 __ hlt(); // empty stubs make SG sick
206 return NULL;
207 }
209 // rsi/r13: sender SP (must preserve; see prepare_to_jump_from_interpreted)
210 // rbx: Method*
211 // rdx: argument locator (parameter slot count, added to rsp)
212 // rcx: used as temp to hold mh or receiver
213 // rax, rdi: garbage temps, blown away
214 Register rdx_argp = rdx; // argument list ptr, live on error paths
215 Register rax_temp = rax;
216 Register rcx_mh = rcx; // MH receiver; dies quickly and is recycled
217 Register rbx_method = rbx; // eventual target of this invocation
219 // here's where control starts out:
220 __ align(CodeEntryAlignment);
221 address entry_point = __ pc();
223 if (VerifyMethodHandles) {
224 Label L;
225 BLOCK_COMMENT("verify_intrinsic_id {");
226 __ cmpb(Address(rbx_method, Method::intrinsic_id_offset_in_bytes()), (int) iid);
227 __ jcc(Assembler::equal, L);
228 if (iid == vmIntrinsics::_linkToVirtual ||
229 iid == vmIntrinsics::_linkToSpecial) {
230 // could do this for all kinds, but would explode assembly code size
231 trace_method_handle(_masm, "bad Method*::intrinsic_id");
232 }
233 __ STOP("bad Method*::intrinsic_id");
234 __ bind(L);
235 BLOCK_COMMENT("} verify_intrinsic_id");
236 }
238 // First task: Find out how big the argument list is.
239 Address rdx_first_arg_addr;
240 int ref_kind = signature_polymorphic_intrinsic_ref_kind(iid);
241 assert(ref_kind != 0 || iid == vmIntrinsics::_invokeBasic, "must be _invokeBasic or a linkTo intrinsic");
242 if (ref_kind == 0 || MethodHandles::ref_kind_has_receiver(ref_kind)) {
243 __ movptr(rdx_argp, Address(rbx_method, Method::const_offset()));
244 __ load_sized_value(rdx_argp,
245 Address(rdx_argp, ConstMethod::size_of_parameters_offset()),
246 sizeof(u2), /*is_signed*/ false);
247 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), "");
248 rdx_first_arg_addr = __ argument_address(rdx_argp, -1);
249 } else {
250 DEBUG_ONLY(rdx_argp = noreg);
251 }
253 if (!is_signature_polymorphic_static(iid)) {
254 __ movptr(rcx_mh, rdx_first_arg_addr);
255 DEBUG_ONLY(rdx_argp = noreg);
256 }
258 // rdx_first_arg_addr is live!
260 trace_method_handle_interpreter_entry(_masm, iid);
262 if (iid == vmIntrinsics::_invokeBasic) {
263 generate_method_handle_dispatch(_masm, iid, rcx_mh, noreg, not_for_compiler_entry);
265 } else {
266 // Adjust argument list by popping the trailing MemberName argument.
267 Register rcx_recv = noreg;
268 if (MethodHandles::ref_kind_has_receiver(ref_kind)) {
269 // Load the receiver (not the MH; the actual MemberName's receiver) up from the interpreter stack.
270 __ movptr(rcx_recv = rcx, rdx_first_arg_addr);
271 }
272 DEBUG_ONLY(rdx_argp = noreg);
273 Register rbx_member = rbx_method; // MemberName ptr; incoming method ptr is dead now
274 __ pop(rax_temp); // return address
275 __ pop(rbx_member); // extract last argument
276 __ push(rax_temp); // re-push return address
277 generate_method_handle_dispatch(_masm, iid, rcx_recv, rbx_member, not_for_compiler_entry);
278 }
280 return entry_point;
281 }
283 void MethodHandles::generate_method_handle_dispatch(MacroAssembler* _masm,
284 vmIntrinsics::ID iid,
285 Register receiver_reg,
286 Register member_reg,
287 bool for_compiler_entry) {
288 assert(is_signature_polymorphic(iid), "expected invoke iid");
289 Register rbx_method = rbx; // eventual target of this invocation
290 // temps used in this code are not used in *either* compiled or interpreted calling sequences
291 #ifdef _LP64
292 Register temp1 = rscratch1;
293 Register temp2 = rscratch2;
294 Register temp3 = rax;
295 if (for_compiler_entry) {
296 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : j_rarg0), "only valid assignment");
297 assert_different_registers(temp1, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5);
298 assert_different_registers(temp2, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5);
299 assert_different_registers(temp3, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5);
300 }
301 #else
302 Register temp1 = (for_compiler_entry ? rsi : rdx);
303 Register temp2 = rdi;
304 Register temp3 = rax;
305 if (for_compiler_entry) {
306 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : rcx), "only valid assignment");
307 assert_different_registers(temp1, rcx, rdx);
308 assert_different_registers(temp2, rcx, rdx);
309 assert_different_registers(temp3, rcx, rdx);
310 }
311 #endif
312 else {
313 assert_different_registers(temp1, temp2, temp3, saved_last_sp_register()); // don't trash lastSP
314 }
315 assert_different_registers(temp1, temp2, temp3, receiver_reg);
316 assert_different_registers(temp1, temp2, temp3, member_reg);
318 if (iid == vmIntrinsics::_invokeBasic) {
319 // indirect through MH.form.vmentry.vmtarget
320 jump_to_lambda_form(_masm, receiver_reg, rbx_method, temp1, for_compiler_entry);
322 } else {
323 // The method is a member invoker used by direct method handles.
324 if (VerifyMethodHandles) {
325 // make sure the trailing argument really is a MemberName (caller responsibility)
326 verify_klass(_masm, member_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_invoke_MemberName),
327 "MemberName required for invokeVirtual etc.");
328 }
330 Address member_clazz( member_reg, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes()));
331 Address member_vmindex( member_reg, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes()));
332 Address member_vmtarget( member_reg, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes()));
334 Register temp1_recv_klass = temp1;
335 if (iid != vmIntrinsics::_linkToStatic) {
336 __ verify_oop(receiver_reg);
337 if (iid == vmIntrinsics::_linkToSpecial) {
338 // Don't actually load the klass; just null-check the receiver.
339 __ null_check(receiver_reg);
340 } else {
341 // load receiver klass itself
342 __ null_check(receiver_reg, oopDesc::klass_offset_in_bytes());
343 __ load_klass(temp1_recv_klass, receiver_reg);
344 __ verify_klass_ptr(temp1_recv_klass);
345 }
346 BLOCK_COMMENT("check_receiver {");
347 // The receiver for the MemberName must be in receiver_reg.
348 // Check the receiver against the MemberName.clazz
349 if (VerifyMethodHandles && iid == vmIntrinsics::_linkToSpecial) {
350 // Did not load it above...
351 __ load_klass(temp1_recv_klass, receiver_reg);
352 __ verify_klass_ptr(temp1_recv_klass);
353 }
354 if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) {
355 Label L_ok;
356 Register temp2_defc = temp2;
357 __ load_heap_oop(temp2_defc, member_clazz);
358 load_klass_from_Class(_masm, temp2_defc);
359 __ verify_klass_ptr(temp2_defc);
360 __ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, L_ok);
361 // If we get here, the type check failed!
362 __ STOP("receiver class disagrees with MemberName.clazz");
363 __ bind(L_ok);
364 }
365 BLOCK_COMMENT("} check_receiver");
366 }
367 if (iid == vmIntrinsics::_linkToSpecial ||
368 iid == vmIntrinsics::_linkToStatic) {
369 DEBUG_ONLY(temp1_recv_klass = noreg); // these guys didn't load the recv_klass
370 }
372 // Live registers at this point:
373 // member_reg - MemberName that was the trailing argument
374 // temp1_recv_klass - klass of stacked receiver, if needed
375 // rsi/r13 - interpreter linkage (if interpreted)
376 // rcx, rdx, rsi, rdi, r8, r8 - compiler arguments (if compiled)
378 Label L_incompatible_class_change_error;
379 switch (iid) {
380 case vmIntrinsics::_linkToSpecial:
381 if (VerifyMethodHandles) {
382 verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp3);
383 }
384 __ movptr(rbx_method, member_vmtarget);
385 break;
387 case vmIntrinsics::_linkToStatic:
388 if (VerifyMethodHandles) {
389 verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp3);
390 }
391 __ movptr(rbx_method, member_vmtarget);
392 break;
394 case vmIntrinsics::_linkToVirtual:
395 {
396 // same as TemplateTable::invokevirtual,
397 // minus the CP setup and profiling:
399 if (VerifyMethodHandles) {
400 verify_ref_kind(_masm, JVM_REF_invokeVirtual, member_reg, temp3);
401 }
403 // pick out the vtable index from the MemberName, and then we can discard it:
404 Register temp2_index = temp2;
405 __ movptr(temp2_index, member_vmindex);
407 if (VerifyMethodHandles) {
408 Label L_index_ok;
409 __ cmpl(temp2_index, 0);
410 __ jcc(Assembler::greaterEqual, L_index_ok);
411 __ STOP("no virtual index");
412 __ BIND(L_index_ok);
413 }
415 // Note: The verifier invariants allow us to ignore MemberName.clazz and vmtarget
416 // at this point. And VerifyMethodHandles has already checked clazz, if needed.
418 // get target Method* & entry point
419 __ lookup_virtual_method(temp1_recv_klass, temp2_index, rbx_method);
420 break;
421 }
423 case vmIntrinsics::_linkToInterface:
424 {
425 // same as TemplateTable::invokeinterface
426 // (minus the CP setup and profiling, with different argument motion)
427 if (VerifyMethodHandles) {
428 verify_ref_kind(_masm, JVM_REF_invokeInterface, member_reg, temp3);
429 }
431 Register temp3_intf = temp3;
432 __ load_heap_oop(temp3_intf, member_clazz);
433 load_klass_from_Class(_masm, temp3_intf);
434 __ verify_klass_ptr(temp3_intf);
436 Register rbx_index = rbx_method;
437 __ movptr(rbx_index, member_vmindex);
438 if (VerifyMethodHandles) {
439 Label L;
440 __ cmpl(rbx_index, 0);
441 __ jcc(Assembler::greaterEqual, L);
442 __ STOP("invalid vtable index for MH.invokeInterface");
443 __ bind(L);
444 }
446 // given intf, index, and recv klass, dispatch to the implementation method
447 __ lookup_interface_method(temp1_recv_klass, temp3_intf,
448 // note: next two args must be the same:
449 rbx_index, rbx_method,
450 temp2,
451 L_incompatible_class_change_error);
452 break;
453 }
455 default:
456 fatal(err_msg_res("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid)));
457 break;
458 }
460 // Live at this point:
461 // rbx_method
462 // rsi/r13 (if interpreted)
464 // After figuring out which concrete method to call, jump into it.
465 // Note that this works in the interpreter with no data motion.
466 // But the compiled version will require that rcx_recv be shifted out.
467 __ verify_method_ptr(rbx_method);
468 jump_from_method_handle(_masm, rbx_method, temp1, for_compiler_entry);
470 if (iid == vmIntrinsics::_linkToInterface) {
471 __ bind(L_incompatible_class_change_error);
472 __ jump(RuntimeAddress(StubRoutines::throw_IncompatibleClassChangeError_entry()));
473 }
474 }
475 }
477 #ifndef PRODUCT
478 void trace_method_handle_stub(const char* adaptername,
479 oop mh,
480 intptr_t* saved_regs,
481 intptr_t* entry_sp) {
482 // called as a leaf from native code: do not block the JVM!
483 bool has_mh = (strstr(adaptername, "/static") == NULL &&
484 strstr(adaptername, "linkTo") == NULL); // static linkers don't have MH
485 const char* mh_reg_name = has_mh ? "rcx_mh" : "rcx";
486 tty->print_cr("MH %s %s="PTR_FORMAT" sp="PTR_FORMAT,
487 adaptername, mh_reg_name,
488 (void *)mh, entry_sp);
490 if (Verbose) {
491 tty->print_cr("Registers:");
492 const int saved_regs_count = RegisterImpl::number_of_registers;
493 for (int i = 0; i < saved_regs_count; i++) {
494 Register r = as_Register(i);
495 // The registers are stored in reverse order on the stack (by pusha).
496 tty->print("%3s=" PTR_FORMAT, r->name(), saved_regs[((saved_regs_count - 1) - i)]);
497 if ((i + 1) % 4 == 0) {
498 tty->cr();
499 } else {
500 tty->print(", ");
501 }
502 }
503 tty->cr();
505 {
506 // dumping last frame with frame::describe
508 JavaThread* p = JavaThread::active();
510 ResourceMark rm;
511 PRESERVE_EXCEPTION_MARK; // may not be needed by safer and unexpensive here
512 FrameValues values;
514 // Note: We want to allow trace_method_handle from any call site.
515 // While trace_method_handle creates a frame, it may be entered
516 // without a PC on the stack top (e.g. not just after a call).
517 // Walking that frame could lead to failures due to that invalid PC.
518 // => carefully detect that frame when doing the stack walking
520 // Current C frame
521 frame cur_frame = os::current_frame();
523 // Robust search of trace_calling_frame (independant of inlining).
524 // Assumes saved_regs comes from a pusha in the trace_calling_frame.
525 assert(cur_frame.sp() < saved_regs, "registers not saved on stack ?");
526 frame trace_calling_frame = os::get_sender_for_C_frame(&cur_frame);
527 while (trace_calling_frame.fp() < saved_regs) {
528 trace_calling_frame = os::get_sender_for_C_frame(&trace_calling_frame);
529 }
531 // safely create a frame and call frame::describe
532 intptr_t *dump_sp = trace_calling_frame.sender_sp();
533 intptr_t *dump_fp = trace_calling_frame.link();
535 bool walkable = has_mh; // whether the traced frame shoud be walkable
537 if (walkable) {
538 // The previous definition of walkable may have to be refined
539 // if new call sites cause the next frame constructor to start
540 // failing. Alternatively, frame constructors could be
541 // modified to support the current or future non walkable
542 // frames (but this is more intrusive and is not considered as
543 // part of this RFE, which will instead use a simpler output).
544 frame dump_frame = frame(dump_sp, dump_fp);
545 dump_frame.describe(values, 1);
546 } else {
547 // Stack may not be walkable (invalid PC above FP):
548 // Add descriptions without building a Java frame to avoid issues
549 values.describe(-1, dump_fp, "fp for #1 <not parsed, cannot trust pc>");
550 values.describe(-1, dump_sp, "sp for #1");
551 }
552 values.describe(-1, entry_sp, "raw top of stack");
554 tty->print_cr("Stack layout:");
555 values.print(p);
556 }
557 if (has_mh && mh->is_oop()) {
558 mh->print();
559 if (java_lang_invoke_MethodHandle::is_instance(mh)) {
560 if (java_lang_invoke_MethodHandle::form_offset_in_bytes() != 0)
561 java_lang_invoke_MethodHandle::form(mh)->print();
562 }
563 }
564 }
565 }
567 // The stub wraps the arguments in a struct on the stack to avoid
568 // dealing with the different calling conventions for passing 6
569 // arguments.
570 struct MethodHandleStubArguments {
571 const char* adaptername;
572 oopDesc* mh;
573 intptr_t* saved_regs;
574 intptr_t* entry_sp;
575 };
576 void trace_method_handle_stub_wrapper(MethodHandleStubArguments* args) {
577 trace_method_handle_stub(args->adaptername,
578 args->mh,
579 args->saved_regs,
580 args->entry_sp);
581 }
583 void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) {
584 if (!TraceMethodHandles) return;
585 BLOCK_COMMENT("trace_method_handle {");
586 __ enter();
587 __ andptr(rsp, -16); // align stack if needed for FPU state
588 __ pusha();
589 __ mov(rbx, rsp); // for retreiving saved_regs
590 // Note: saved_regs must be in the entered frame for the
591 // robust stack walking implemented in trace_method_handle_stub.
593 // save FP result, valid at some call sites (adapter_opt_return_float, ...)
594 __ increment(rsp, -2 * wordSize);
595 if (UseSSE >= 2) {
596 __ movdbl(Address(rsp, 0), xmm0);
597 } else if (UseSSE == 1) {
598 __ movflt(Address(rsp, 0), xmm0);
599 } else {
600 __ fst_d(Address(rsp, 0));
601 }
603 // Incoming state:
604 // rcx: method handle
605 //
606 // To avoid calling convention issues, build a record on the stack
607 // and pass the pointer to that instead.
608 __ push(rbp); // entry_sp (with extra align space)
609 __ push(rbx); // pusha saved_regs
610 __ push(rcx); // mh
611 __ push(rcx); // slot for adaptername
612 __ movptr(Address(rsp, 0), (intptr_t) adaptername);
613 __ super_call_VM_leaf(CAST_FROM_FN_PTR(address, trace_method_handle_stub_wrapper), rsp);
614 __ increment(rsp, sizeof(MethodHandleStubArguments));
616 if (UseSSE >= 2) {
617 __ movdbl(xmm0, Address(rsp, 0));
618 } else if (UseSSE == 1) {
619 __ movflt(xmm0, Address(rsp, 0));
620 } else {
621 __ fld_d(Address(rsp, 0));
622 }
623 __ increment(rsp, 2 * wordSize);
625 __ popa();
626 __ leave();
627 BLOCK_COMMENT("} trace_method_handle");
628 }
629 #endif //PRODUCT