1/*
2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2012, 2015 SAP SE. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26#include "precompiled.hpp"
27#include "asm/macroAssembler.inline.hpp"
28#include "classfile/javaClasses.inline.hpp"
29#include "interpreter/interpreter.hpp"
30#include "memory/allocation.inline.hpp"
31#include "memory/resourceArea.hpp"
32#include "prims/methodHandles.hpp"
33
34#define __ _masm->
35
36#ifdef PRODUCT
37#define BLOCK_COMMENT(str) // nothing
38#else
39#define BLOCK_COMMENT(str) __ block_comment(str)
40#endif
41
42#define BIND(label) bind(label); BLOCK_COMMENT(#label ":")
43
44// Workaround for C++ overloading nastiness on '0' for RegisterOrConstant.
45inline static RegisterOrConstant constant(int value) {
46  return RegisterOrConstant(value);
47}
48
49void MethodHandles::load_klass_from_Class(MacroAssembler* _masm, Register klass_reg,
50                                          Register temp_reg, Register temp2_reg) {
51  if (VerifyMethodHandles) {
52    verify_klass(_masm, klass_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_Class),
53                 temp_reg, temp2_reg, "MH argument is a Class");
54  }
55  __ ld(klass_reg, java_lang_Class::klass_offset_in_bytes(), klass_reg);
56}
57
58#ifdef ASSERT
59static 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
69void MethodHandles::verify_klass(MacroAssembler* _masm,
70                                 Register obj_reg, SystemDictionary::WKID klass_id,
71                                 Register temp_reg, Register temp2_reg,
72                                 const char* error_message) {
73  InstanceKlass** klass_addr = SystemDictionary::well_known_klass_addr(klass_id);
74  KlassHandle klass = SystemDictionary::well_known_klass(klass_id);
75  Label L_ok, L_bad;
76  BLOCK_COMMENT("verify_klass {");
77  __ verify_oop(obj_reg);
78  __ cmpdi(CCR0, obj_reg, 0);
79  __ beq(CCR0, L_bad);
80  __ load_klass(temp_reg, obj_reg);
81  __ load_const_optimized(temp2_reg, (address) klass_addr);
82  __ ld(temp2_reg, 0, temp2_reg);
83  __ cmpd(CCR0, temp_reg, temp2_reg);
84  __ beq(CCR0, L_ok);
85  __ ld(temp_reg, klass->super_check_offset(), temp_reg);
86  __ cmpd(CCR0, temp_reg, temp2_reg);
87  __ beq(CCR0, L_ok);
88  __ BIND(L_bad);
89  __ stop(error_message);
90  __ BIND(L_ok);
91  BLOCK_COMMENT("} verify_klass");
92}
93
94void MethodHandles::verify_ref_kind(MacroAssembler* _masm, int ref_kind, Register member_reg, Register temp) {
95  Label L;
96  BLOCK_COMMENT("verify_ref_kind {");
97  __ load_sized_value(temp, NONZERO(java_lang_invoke_MemberName::flags_offset_in_bytes()), member_reg,
98                      sizeof(u4), /*is_signed*/ false);
99  // assert(sizeof(u4) == sizeof(java.lang.invoke.MemberName.flags), "");
100  __ srwi( temp, temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT);
101  __ andi(temp, temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK);
102  __ cmpwi(CCR1, temp, ref_kind);
103  __ beq(CCR1, L);
104  { char* buf = NEW_C_HEAP_ARRAY(char, 100, mtInternal);
105    jio_snprintf(buf, 100, "verify_ref_kind expected %x", ref_kind);
106    if (ref_kind == JVM_REF_invokeVirtual ||
107        ref_kind == JVM_REF_invokeSpecial)
108      // could do this for all ref_kinds, but would explode assembly code size
109      trace_method_handle(_masm, buf);
110    __ stop(buf);
111  }
112  BLOCK_COMMENT("} verify_ref_kind");
113  __ BIND(L);
114}
115
116#endif // ASSERT
117
118void MethodHandles::jump_from_method_handle(MacroAssembler* _masm, Register method, Register target, Register temp,
119                                            bool for_compiler_entry) {
120  Label L_no_such_method;
121  assert(method == R19_method, "interpreter calling convention");
122  assert_different_registers(method, target, temp);
123
124  if (!for_compiler_entry && JvmtiExport::can_post_interpreter_events()) {
125    Label run_compiled_code;
126    // JVMTI events, such as single-stepping, are implemented partly by avoiding running
127    // compiled code in threads for which the event is enabled.  Check here for
128    // interp_only_mode if these events CAN be enabled.
129    __ verify_thread();
130    __ lwz(temp, in_bytes(JavaThread::interp_only_mode_offset()), R16_thread);
131    __ cmplwi(CCR0, temp, 0);
132    __ beq(CCR0, run_compiled_code);
133    // Null method test is replicated below in compiled case,
134    // it might be able to address across the verify_thread()
135    __ cmplwi(CCR0, R19_method, 0);
136    __ beq(CCR0, L_no_such_method);
137    __ ld(target, in_bytes(Method::interpreter_entry_offset()), R19_method);
138    __ mtctr(target);
139    __ bctr();
140    __ BIND(run_compiled_code);
141  }
142
143  // Compiled case, either static or fall-through from runtime conditional
144  __ cmplwi(CCR0, R19_method, 0);
145  __ beq(CCR0, L_no_such_method);
146
147  const ByteSize entry_offset = for_compiler_entry ? Method::from_compiled_offset() :
148                                                     Method::from_interpreted_offset();
149  __ ld(target, in_bytes(entry_offset), R19_method);
150  __ mtctr(target);
151  __ bctr();
152
153  __ bind(L_no_such_method);
154  assert(StubRoutines::throw_AbstractMethodError_entry() != NULL, "not yet generated!");
155  __ load_const_optimized(target, StubRoutines::throw_AbstractMethodError_entry());
156  __ mtctr(target);
157  __ bctr();
158}
159
160
161void MethodHandles::jump_to_lambda_form(MacroAssembler* _masm,
162                                        Register recv, Register method_temp,
163                                        Register temp2, Register temp3,
164                                        bool for_compiler_entry) {
165  BLOCK_COMMENT("jump_to_lambda_form {");
166  // This is the initial entry point of a lazy method handle.
167  // After type checking, it picks up the invoker from the LambdaForm.
168  assert_different_registers(recv, method_temp, temp2);  // temp3 is only passed on
169  assert(method_temp == R19_method, "required register for loading method");
170
171  // Load the invoker, as MH -> MH.form -> LF.vmentry
172  __ verify_oop(recv);
173  __ load_heap_oop_not_null(method_temp, NONZERO(java_lang_invoke_MethodHandle::form_offset_in_bytes()), recv, temp2);
174  __ verify_oop(method_temp);
175  __ load_heap_oop_not_null(method_temp, NONZERO(java_lang_invoke_LambdaForm::vmentry_offset_in_bytes()), method_temp, temp2);
176  __ verify_oop(method_temp);
177  // The following assumes that a Method* is normally compressed in the vmtarget field:
178  __ ld(method_temp, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes()), method_temp);
179
180  if (VerifyMethodHandles && !for_compiler_entry) {
181    // Make sure recv is already on stack.
182    __ ld(temp2, in_bytes(Method::const_offset()), method_temp);
183    __ load_sized_value(temp2, in_bytes(ConstMethod::size_of_parameters_offset()), temp2,
184                        sizeof(u2), /*is_signed*/ false);
185    // assert(sizeof(u2) == sizeof(ConstMethod::_size_of_parameters), "");
186    Label L;
187    __ ld(temp2, __ argument_offset(temp2, temp2, 0), R15_esp);
188    __ cmpd(CCR1, temp2, recv);
189    __ beq(CCR1, L);
190    __ stop("receiver not on stack");
191    __ BIND(L);
192  }
193
194  jump_from_method_handle(_masm, method_temp, temp2, temp3, for_compiler_entry);
195  BLOCK_COMMENT("} jump_to_lambda_form");
196}
197
198
199
200// Code generation
201address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm,
202                                                                vmIntrinsics::ID iid) {
203  const bool not_for_compiler_entry = false;  // this is the interpreter entry
204  assert(is_signature_polymorphic(iid), "expected invoke iid");
205  if (iid == vmIntrinsics::_invokeGeneric ||
206      iid == vmIntrinsics::_compiledLambdaForm) {
207    // Perhaps surprisingly, the symbolic references visible to Java are not directly used.
208    // They are linked to Java-generated adapters via MethodHandleNatives.linkMethod.
209    // They all allow an appendix argument.
210    __ stop("Should not reach here");           // empty stubs make SG sick
211    return NULL;
212  }
213
214  Register argbase    = R15_esp; // parameter (preserved)
215  Register argslot    = R3;
216  Register temp1      = R6;
217  Register param_size = R7;
218
219  // here's where control starts out:
220  __ align(CodeEntryAlignment);
221  address entry_point = __ pc();
222
223  if (VerifyMethodHandles) {
224    assert(Method::intrinsic_id_size_in_bytes() == 2, "assuming Method::_intrinsic_id is u2");
225
226    Label L;
227    BLOCK_COMMENT("verify_intrinsic_id {");
228    __ load_sized_value(temp1, Method::intrinsic_id_offset_in_bytes(), R19_method,
229                        sizeof(u2), /*is_signed*/ false);
230    __ cmpwi(CCR1, temp1, (int) iid);
231    __ beq(CCR1, L);
232    if (iid == vmIntrinsics::_linkToVirtual ||
233        iid == vmIntrinsics::_linkToSpecial) {
234      // could do this for all kinds, but would explode assembly code size
235      trace_method_handle(_masm, "bad Method*:intrinsic_id");
236    }
237    __ stop("bad Method*::intrinsic_id");
238    __ BIND(L);
239    BLOCK_COMMENT("} verify_intrinsic_id");
240  }
241
242  // First task:  Find out how big the argument list is.
243  int ref_kind = signature_polymorphic_intrinsic_ref_kind(iid);
244  assert(ref_kind != 0 || iid == vmIntrinsics::_invokeBasic, "must be _invokeBasic or a linkTo intrinsic");
245  if (ref_kind == 0 || MethodHandles::ref_kind_has_receiver(ref_kind)) {
246    __ ld(param_size, in_bytes(Method::const_offset()), R19_method);
247    __ load_sized_value(param_size, in_bytes(ConstMethod::size_of_parameters_offset()), param_size,
248                        sizeof(u2), /*is_signed*/ false);
249    // assert(sizeof(u2) == sizeof(ConstMethod::_size_of_parameters), "");
250  } else {
251    DEBUG_ONLY(param_size = noreg);
252  }
253
254  Register tmp_mh = noreg;
255  if (!is_signature_polymorphic_static(iid)) {
256    __ ld(tmp_mh = temp1, __ argument_offset(param_size, param_size, 0), argbase);
257    DEBUG_ONLY(param_size = noreg);
258  }
259
260  if (TraceMethodHandles) {
261    if (tmp_mh != noreg) {
262      __ mr(R23_method_handle, tmp_mh);  // make stub happy
263    }
264    trace_method_handle_interpreter_entry(_masm, iid);
265  }
266
267  if (iid == vmIntrinsics::_invokeBasic) {
268    generate_method_handle_dispatch(_masm, iid, tmp_mh, noreg, not_for_compiler_entry);
269
270  } else {
271    // Adjust argument list by popping the trailing MemberName argument.
272    Register tmp_recv = noreg;
273    if (MethodHandles::ref_kind_has_receiver(ref_kind)) {
274      // Load the receiver (not the MH; the actual MemberName's receiver) up from the interpreter stack.
275      __ ld(tmp_recv = temp1, __ argument_offset(param_size, param_size, 0), argbase);
276      DEBUG_ONLY(param_size = noreg);
277    }
278    Register R19_member = R19_method;  // MemberName ptr; incoming method ptr is dead now
279    __ ld(R19_member, RegisterOrConstant((intptr_t)8), argbase);
280    __ add(argbase, Interpreter::stackElementSize, argbase);
281    generate_method_handle_dispatch(_masm, iid, tmp_recv, R19_member, not_for_compiler_entry);
282  }
283
284  return entry_point;
285}
286
287void MethodHandles::generate_method_handle_dispatch(MacroAssembler* _masm,
288                                                    vmIntrinsics::ID iid,
289                                                    Register receiver_reg,
290                                                    Register member_reg,
291                                                    bool for_compiler_entry) {
292  assert(is_signature_polymorphic(iid), "expected invoke iid");
293  Register temp1 = (for_compiler_entry ? R25_tmp5 : R7);
294  Register temp2 = (for_compiler_entry ? R22_tmp2 : R8);
295  Register temp3 = (for_compiler_entry ? R23_tmp3 : R9);
296  Register temp4 = (for_compiler_entry ? R24_tmp4 : R10);
297  if (receiver_reg != noreg)  assert_different_registers(temp1, temp2, temp3, temp4, receiver_reg);
298  if (member_reg   != noreg)  assert_different_registers(temp1, temp2, temp3, temp4, member_reg);
299
300  if (iid == vmIntrinsics::_invokeBasic) {
301    // indirect through MH.form.vmentry.vmtarget
302    jump_to_lambda_form(_masm, receiver_reg, R19_method, temp1, temp2, for_compiler_entry);
303  } else {
304    // The method is a member invoker used by direct method handles.
305    if (VerifyMethodHandles) {
306      // make sure the trailing argument really is a MemberName (caller responsibility)
307      verify_klass(_masm, member_reg, SystemDictionary::WK_KLASS_ENUM_NAME(MemberName_klass),
308                   temp1, temp2,
309                   "MemberName required for invokeVirtual etc.");
310    }
311
312    Register temp1_recv_klass = temp1;
313    if (iid != vmIntrinsics::_linkToStatic) {
314      __ verify_oop(receiver_reg);
315      if (iid == vmIntrinsics::_linkToSpecial) {
316        // Don't actually load the klass; just null-check the receiver.
317        __ null_check_throw(receiver_reg, -1, temp1,
318                            Interpreter::throw_NullPointerException_entry());
319      } else {
320        // load receiver klass itself
321        __ null_check_throw(receiver_reg, oopDesc::klass_offset_in_bytes(), temp1,
322                            Interpreter::throw_NullPointerException_entry());
323        __ load_klass(temp1_recv_klass, receiver_reg);
324        __ verify_klass_ptr(temp1_recv_klass);
325      }
326      BLOCK_COMMENT("check_receiver {");
327      // The receiver for the MemberName must be in receiver_reg.
328      // Check the receiver against the MemberName.clazz
329      if (VerifyMethodHandles && iid == vmIntrinsics::_linkToSpecial) {
330        // Did not load it above...
331        __ load_klass(temp1_recv_klass, receiver_reg);
332        __ verify_klass_ptr(temp1_recv_klass);
333      }
334      if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) {
335        Label L_ok;
336        Register temp2_defc = temp2;
337        __ load_heap_oop_not_null(temp2_defc, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes()), member_reg, temp3);
338        load_klass_from_Class(_masm, temp2_defc, temp3, temp4);
339        __ verify_klass_ptr(temp2_defc);
340        __ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, temp4, L_ok);
341        // If we get here, the type check failed!
342        __ stop("receiver class disagrees with MemberName.clazz");
343        __ BIND(L_ok);
344      }
345      BLOCK_COMMENT("} check_receiver");
346    }
347    if (iid == vmIntrinsics::_linkToSpecial ||
348        iid == vmIntrinsics::_linkToStatic) {
349      DEBUG_ONLY(temp1_recv_klass = noreg);  // these guys didn't load the recv_klass
350    }
351
352    // Live registers at this point:
353    //  member_reg - MemberName that was the trailing argument
354    //  temp1_recv_klass - klass of stacked receiver, if needed
355    //  O5_savedSP - interpreter linkage (if interpreted)
356    //  O0..O5 - compiler arguments (if compiled)
357
358    Label L_incompatible_class_change_error;
359    switch (iid) {
360    case vmIntrinsics::_linkToSpecial:
361      if (VerifyMethodHandles) {
362        verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp2);
363      }
364      __ ld(R19_method, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes()), member_reg);
365      break;
366
367    case vmIntrinsics::_linkToStatic:
368      if (VerifyMethodHandles) {
369        verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp2);
370      }
371      __ ld(R19_method, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes()), member_reg);
372      break;
373
374    case vmIntrinsics::_linkToVirtual:
375    {
376      // same as TemplateTable::invokevirtual,
377      // minus the CP setup and profiling:
378
379      if (VerifyMethodHandles) {
380        verify_ref_kind(_masm, JVM_REF_invokeVirtual, member_reg, temp2);
381      }
382
383      // pick out the vtable index from the MemberName, and then we can discard it:
384      Register temp2_index = temp2;
385      __ ld(temp2_index, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes()), member_reg);
386
387      if (VerifyMethodHandles) {
388        Label L_index_ok;
389        __ cmpdi(CCR1, temp2_index, 0);
390        __ bge(CCR1, L_index_ok);
391        __ stop("no virtual index");
392        __ BIND(L_index_ok);
393      }
394
395      // Note:  The verifier invariants allow us to ignore MemberName.clazz and vmtarget
396      // at this point.  And VerifyMethodHandles has already checked clazz, if needed.
397
398      // get target Method* & entry point
399      __ lookup_virtual_method(temp1_recv_klass, temp2_index, R19_method);
400      break;
401    }
402
403    case vmIntrinsics::_linkToInterface:
404    {
405      // same as TemplateTable::invokeinterface
406      // (minus the CP setup and profiling, with different argument motion)
407      if (VerifyMethodHandles) {
408        verify_ref_kind(_masm, JVM_REF_invokeInterface, member_reg, temp2);
409      }
410
411      Register temp2_intf = temp2;
412      __ load_heap_oop_not_null(temp2_intf, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes()), member_reg, temp3);
413      load_klass_from_Class(_masm, temp2_intf, temp3, temp4);
414      __ verify_klass_ptr(temp2_intf);
415
416      Register vtable_index = R19_method;
417      __ ld(vtable_index, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes()), member_reg);
418      if (VerifyMethodHandles) {
419        Label L_index_ok;
420        __ cmpdi(CCR1, vtable_index, 0);
421        __ bge(CCR1, L_index_ok);
422        __ stop("invalid vtable index for MH.invokeInterface");
423        __ BIND(L_index_ok);
424      }
425
426      // given intf, index, and recv klass, dispatch to the implementation method
427      __ lookup_interface_method(temp1_recv_klass, temp2_intf,
428                                 // note: next two args must be the same:
429                                 vtable_index, R19_method,
430                                 temp3, temp4,
431                                 L_incompatible_class_change_error);
432      break;
433    }
434
435    default:
436      fatal("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid));
437      break;
438    }
439
440    // Live at this point:
441    //   R19_method
442    //   O5_savedSP (if interpreted)
443
444    // After figuring out which concrete method to call, jump into it.
445    // Note that this works in the interpreter with no data motion.
446    // But the compiled version will require that rcx_recv be shifted out.
447    __ verify_method_ptr(R19_method);
448    jump_from_method_handle(_masm, R19_method, temp1, temp2, for_compiler_entry);
449
450    if (iid == vmIntrinsics::_linkToInterface) {
451      __ BIND(L_incompatible_class_change_error);
452      __ load_const_optimized(temp1, StubRoutines::throw_IncompatibleClassChangeError_entry());
453      __ mtctr(temp1);
454      __ bctr();
455    }
456  }
457}
458
459#ifndef PRODUCT
460void trace_method_handle_stub(const char* adaptername,
461                              oopDesc* mh,
462                              intptr_t* entry_sp,
463                              intptr_t* saved_regs) {
464
465  bool has_mh = (strstr(adaptername, "/static") == NULL &&
466                 strstr(adaptername, "linkTo") == NULL);    // static linkers don't have MH
467  const char* mh_reg_name = has_mh ? "R23_method_handle" : "G23";
468  tty->print_cr("MH %s %s=" INTPTR_FORMAT " sp=" INTPTR_FORMAT,
469                adaptername, mh_reg_name, p2i(mh), p2i(entry_sp));
470
471  if (Verbose) {
472    tty->print_cr("Registers:");
473    const int abi_offset = frame::abi_reg_args_size / 8;
474    for (int i = R3->encoding(); i <= R12->encoding(); i++) {
475      Register r = as_Register(i);
476      int count = i - R3->encoding();
477      // The registers are stored in reverse order on the stack (by save_volatile_gprs(R1_SP, abi_reg_args_size)).
478      tty->print("%3s=" PTR_FORMAT, r->name(), saved_regs[abi_offset + count]);
479      if ((count + 1) % 4 == 0) {
480        tty->cr();
481      } else {
482        tty->print(", ");
483      }
484    }
485    tty->cr();
486
487    {
488      // dumping last frame with frame::describe
489
490      JavaThread* p = JavaThread::active();
491
492      ResourceMark rm;
493      PRESERVE_EXCEPTION_MARK; // may not be needed by safer and unexpensive here
494      FrameValues values;
495
496      // Note: We want to allow trace_method_handle from any call site.
497      // While trace_method_handle creates a frame, it may be entered
498      // without a PC on the stack top (e.g. not just after a call).
499      // Walking that frame could lead to failures due to that invalid PC.
500      // => carefully detect that frame when doing the stack walking
501
502      // Current C frame
503      frame cur_frame = os::current_frame();
504
505      // Robust search of trace_calling_frame (independant of inlining).
506      assert(cur_frame.sp() <= saved_regs, "registers not saved on stack ?");
507      frame trace_calling_frame = os::get_sender_for_C_frame(&cur_frame);
508      while (trace_calling_frame.fp() < saved_regs) {
509        trace_calling_frame = os::get_sender_for_C_frame(&trace_calling_frame);
510      }
511
512      // Safely create a frame and call frame::describe.
513      intptr_t *dump_sp = trace_calling_frame.sender_sp();
514
515      frame dump_frame = frame(dump_sp);
516      dump_frame.describe(values, 1);
517
518      values.describe(-1, saved_regs, "raw top of stack");
519
520      tty->print_cr("Stack layout:");
521      values.print(p);
522    }
523
524    if (has_mh && mh->is_oop()) {
525      mh->print();
526      if (java_lang_invoke_MethodHandle::is_instance(mh)) {
527        if (java_lang_invoke_MethodHandle::form_offset_in_bytes() != 0)
528          java_lang_invoke_MethodHandle::form(mh)->print();
529      }
530    }
531  }
532}
533
534void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) {
535  if (!TraceMethodHandles) return;
536
537  BLOCK_COMMENT("trace_method_handle {");
538
539  const Register tmp = R11; // Will be preserved.
540  const int nbytes_save = MacroAssembler::num_volatile_regs * 8;
541  __ save_volatile_gprs(R1_SP, -nbytes_save); // except R0
542  __ save_LR_CR(tmp); // save in old frame
543
544  __ mr(R5_ARG3, R1_SP);     // saved_sp
545  __ push_frame_reg_args(nbytes_save, tmp);
546
547  __ load_const_optimized(R3_ARG1, (address)adaptername, tmp);
548  __ mr(R4_ARG2, R23_method_handle);
549  __ mr(R6_ARG4, R1_SP);
550  __ call_VM_leaf(CAST_FROM_FN_PTR(address, trace_method_handle_stub));
551
552  __ pop_frame();
553  __ restore_LR_CR(tmp);
554  __ restore_volatile_gprs(R1_SP, -nbytes_save); // except R0
555
556  BLOCK_COMMENT("} trace_method_handle");
557}
558#endif // PRODUCT
559