Tue, 14 Jun 2011 14:41:33 -0700
7052219: JSR 292: Crash in ~BufferBlob::MethodHandles adapters
Reviewed-by: twisti, kvn, jrose
1 /*
2 * Copyright (c) 1997, 2011, 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.
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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).
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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23 */
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"
31 #define __ _masm->
33 #ifdef PRODUCT
34 #define BLOCK_COMMENT(str) /* nothing */
35 #else
36 #define BLOCK_COMMENT(str) __ block_comment(str)
37 #endif
39 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":")
41 // Workaround for C++ overloading nastiness on '0' for RegisterOrConstant.
42 static RegisterOrConstant constant(int value) {
43 return RegisterOrConstant(value);
44 }
46 address MethodHandleEntry::start_compiled_entry(MacroAssembler* _masm,
47 address interpreted_entry) {
48 // Just before the actual machine code entry point, allocate space
49 // for a MethodHandleEntry::Data record, so that we can manage everything
50 // from one base pointer.
51 __ align(wordSize);
52 address target = __ pc() + sizeof(Data);
53 while (__ pc() < target) {
54 __ nop();
55 __ align(wordSize);
56 }
58 MethodHandleEntry* me = (MethodHandleEntry*) __ pc();
59 me->set_end_address(__ pc()); // set a temporary end_address
60 me->set_from_interpreted_entry(interpreted_entry);
61 me->set_type_checking_entry(NULL);
63 return (address) me;
64 }
66 MethodHandleEntry* MethodHandleEntry::finish_compiled_entry(MacroAssembler* _masm,
67 address start_addr) {
68 MethodHandleEntry* me = (MethodHandleEntry*) start_addr;
69 assert(me->end_address() == start_addr, "valid ME");
71 // Fill in the real end_address:
72 __ align(wordSize);
73 me->set_end_address(__ pc());
75 return me;
76 }
78 // stack walking support
80 frame MethodHandles::ricochet_frame_sender(const frame& fr, RegisterMap *map) {
81 RicochetFrame* f = RicochetFrame::from_frame(fr);
82 if (map->update_map())
83 frame::update_map_with_saved_link(map, &f->_sender_link);
84 return frame(f->extended_sender_sp(), f->exact_sender_sp(), f->sender_link(), f->sender_pc());
85 }
87 void MethodHandles::ricochet_frame_oops_do(const frame& fr, OopClosure* blk, const RegisterMap* reg_map) {
88 RicochetFrame* f = RicochetFrame::from_frame(fr);
90 // pick up the argument type descriptor:
91 Thread* thread = Thread::current();
92 Handle cookie(thread, f->compute_saved_args_layout(true, true));
94 // process fixed part
95 blk->do_oop((oop*)f->saved_target_addr());
96 blk->do_oop((oop*)f->saved_args_layout_addr());
98 // process variable arguments:
99 if (cookie.is_null()) return; // no arguments to describe
101 // the cookie is actually the invokeExact method for my target
102 // his argument signature is what I'm interested in
103 assert(cookie->is_method(), "");
104 methodHandle invoker(thread, methodOop(cookie()));
105 assert(invoker->name() == vmSymbols::invokeExact_name(), "must be this kind of method");
106 assert(!invoker->is_static(), "must have MH argument");
107 int slot_count = invoker->size_of_parameters();
108 assert(slot_count >= 1, "must include 'this'");
109 intptr_t* base = f->saved_args_base();
110 intptr_t* retval = NULL;
111 if (f->has_return_value_slot())
112 retval = f->return_value_slot_addr();
113 int slot_num = slot_count;
114 intptr_t* loc = &base[slot_num -= 1];
115 //blk->do_oop((oop*) loc); // original target, which is irrelevant
116 int arg_num = 0;
117 for (SignatureStream ss(invoker->signature()); !ss.is_done(); ss.next()) {
118 if (ss.at_return_type()) continue;
119 BasicType ptype = ss.type();
120 if (ptype == T_ARRAY) ptype = T_OBJECT; // fold all refs to T_OBJECT
121 assert(ptype >= T_BOOLEAN && ptype <= T_OBJECT, "not array or void");
122 loc = &base[slot_num -= type2size[ptype]];
123 bool is_oop = (ptype == T_OBJECT && loc != retval);
124 if (is_oop) blk->do_oop((oop*)loc);
125 arg_num += 1;
126 }
127 assert(slot_num == 0, "must have processed all the arguments");
128 }
130 oop MethodHandles::RicochetFrame::compute_saved_args_layout(bool read_cache, bool write_cache) {
131 oop cookie = NULL;
132 if (read_cache) {
133 cookie = saved_args_layout();
134 if (cookie != NULL) return cookie;
135 }
136 oop target = saved_target();
137 oop mtype = java_lang_invoke_MethodHandle::type(target);
138 oop mtform = java_lang_invoke_MethodType::form(mtype);
139 cookie = java_lang_invoke_MethodTypeForm::vmlayout(mtform);
140 if (write_cache) {
141 (*saved_args_layout_addr()) = cookie;
142 }
143 return cookie;
144 }
146 void MethodHandles::RicochetFrame::generate_ricochet_blob(MacroAssembler* _masm,
147 // output params:
148 int* bounce_offset,
149 int* exception_offset,
150 int* frame_size_in_words) {
151 (*frame_size_in_words) = RicochetFrame::frame_size_in_bytes() / wordSize;
153 address start = __ pc();
155 #ifdef ASSERT
156 __ hlt(); __ hlt(); __ hlt();
157 // here's a hint of something special:
158 __ push(MAGIC_NUMBER_1);
159 __ push(MAGIC_NUMBER_2);
160 #endif //ASSERT
161 __ hlt(); // not reached
163 // A return PC has just been popped from the stack.
164 // Return values are in registers.
165 // The ebp points into the RicochetFrame, which contains
166 // a cleanup continuation we must return to.
168 (*bounce_offset) = __ pc() - start;
169 BLOCK_COMMENT("ricochet_blob.bounce");
171 if (VerifyMethodHandles) RicochetFrame::verify_clean(_masm);
172 trace_method_handle(_masm, "return/ricochet_blob.bounce");
174 __ jmp(frame_address(continuation_offset_in_bytes()));
175 __ hlt();
176 DEBUG_ONLY(__ push(MAGIC_NUMBER_2));
178 (*exception_offset) = __ pc() - start;
179 BLOCK_COMMENT("ricochet_blob.exception");
181 // compare this to Interpreter::rethrow_exception_entry, which is parallel code
182 // for example, see TemplateInterpreterGenerator::generate_throw_exception
183 // Live registers in:
184 // rax: exception
185 // rdx: return address/pc that threw exception (ignored, always equal to bounce addr)
186 __ verify_oop(rax);
188 // no need to empty_FPU_stack or reinit_heapbase, since caller frame will do the same if needed
190 // Take down the frame.
192 // Cf. InterpreterMacroAssembler::remove_activation.
193 leave_ricochet_frame(_masm, /*rcx_recv=*/ noreg,
194 saved_last_sp_register(),
195 /*sender_pc_reg=*/ rdx);
197 // In between activations - previous activation type unknown yet
198 // compute continuation point - the continuation point expects the
199 // following registers set up:
200 //
201 // rax: exception
202 // rdx: return address/pc that threw exception
203 // rsp: expression stack of caller
204 // rbp: ebp of caller
205 __ push(rax); // save exception
206 __ push(rdx); // save return address
207 Register thread_reg = LP64_ONLY(r15_thread) NOT_LP64(rdi);
208 NOT_LP64(__ get_thread(thread_reg));
209 __ call_VM_leaf(CAST_FROM_FN_PTR(address,
210 SharedRuntime::exception_handler_for_return_address),
211 thread_reg, rdx);
212 __ mov(rbx, rax); // save exception handler
213 __ pop(rdx); // restore return address
214 __ pop(rax); // restore exception
215 __ jmp(rbx); // jump to exception
216 // handler of caller
217 }
219 void MethodHandles::RicochetFrame::enter_ricochet_frame(MacroAssembler* _masm,
220 Register rcx_recv,
221 Register rax_argv,
222 address return_handler,
223 Register rbx_temp) {
224 const Register saved_last_sp = saved_last_sp_register();
225 Address rcx_mh_vmtarget( rcx_recv, java_lang_invoke_MethodHandle::vmtarget_offset_in_bytes() );
226 Address rcx_amh_conversion( rcx_recv, java_lang_invoke_AdapterMethodHandle::conversion_offset_in_bytes() );
228 // Push the RicochetFrame a word at a time.
229 // This creates something similar to an interpreter frame.
230 // Cf. TemplateInterpreterGenerator::generate_fixed_frame.
231 BLOCK_COMMENT("push RicochetFrame {");
232 DEBUG_ONLY(int rfo = (int) sizeof(RicochetFrame));
233 assert((rfo -= wordSize) == RicochetFrame::sender_pc_offset_in_bytes(), "");
234 #define RF_FIELD(push_value, name) \
235 { push_value; \
236 assert((rfo -= wordSize) == RicochetFrame::name##_offset_in_bytes(), ""); }
237 RF_FIELD(__ push(rbp), sender_link);
238 RF_FIELD(__ push(saved_last_sp), exact_sender_sp); // rsi/r13
239 RF_FIELD(__ pushptr(rcx_amh_conversion), conversion);
240 RF_FIELD(__ push(rax_argv), saved_args_base); // can be updated if args are shifted
241 RF_FIELD(__ push((int32_t) NULL_WORD), saved_args_layout); // cache for GC layout cookie
242 if (UseCompressedOops) {
243 __ load_heap_oop(rbx_temp, rcx_mh_vmtarget);
244 RF_FIELD(__ push(rbx_temp), saved_target);
245 } else {
246 RF_FIELD(__ pushptr(rcx_mh_vmtarget), saved_target);
247 }
248 __ lea(rbx_temp, ExternalAddress(return_handler));
249 RF_FIELD(__ push(rbx_temp), continuation);
250 #undef RF_FIELD
251 assert(rfo == 0, "fully initialized the RicochetFrame");
252 // compute new frame pointer:
253 __ lea(rbp, Address(rsp, RicochetFrame::sender_link_offset_in_bytes()));
254 // Push guard word #1 in debug mode.
255 DEBUG_ONLY(__ push((int32_t) RicochetFrame::MAGIC_NUMBER_1));
256 // For debugging, leave behind an indication of which stub built this frame.
257 DEBUG_ONLY({ Label L; __ call(L, relocInfo::none); __ bind(L); });
258 BLOCK_COMMENT("} RicochetFrame");
259 }
261 void MethodHandles::RicochetFrame::leave_ricochet_frame(MacroAssembler* _masm,
262 Register rcx_recv,
263 Register new_sp_reg,
264 Register sender_pc_reg) {
265 assert_different_registers(rcx_recv, new_sp_reg, sender_pc_reg);
266 const Register saved_last_sp = saved_last_sp_register();
267 // Take down the frame.
268 // Cf. InterpreterMacroAssembler::remove_activation.
269 BLOCK_COMMENT("end_ricochet_frame {");
270 // TO DO: If (exact_sender_sp - extended_sender_sp) > THRESH, compact the frame down.
271 // This will keep stack in bounds even with unlimited tailcalls, each with an adapter.
272 if (rcx_recv->is_valid())
273 __ movptr(rcx_recv, RicochetFrame::frame_address(RicochetFrame::saved_target_offset_in_bytes()));
274 __ movptr(sender_pc_reg, RicochetFrame::frame_address(RicochetFrame::sender_pc_offset_in_bytes()));
275 __ movptr(saved_last_sp, RicochetFrame::frame_address(RicochetFrame::exact_sender_sp_offset_in_bytes()));
276 __ movptr(rbp, RicochetFrame::frame_address(RicochetFrame::sender_link_offset_in_bytes()));
277 __ mov(rsp, new_sp_reg);
278 BLOCK_COMMENT("} end_ricochet_frame");
279 }
281 // Emit code to verify that RBP is pointing at a valid ricochet frame.
282 #ifdef ASSERT
283 enum {
284 ARG_LIMIT = 255, SLOP = 4,
285 // use this parameter for checking for garbage stack movements:
286 UNREASONABLE_STACK_MOVE = (ARG_LIMIT + SLOP)
287 // the slop defends against false alarms due to fencepost errors
288 };
290 void MethodHandles::RicochetFrame::verify_clean(MacroAssembler* _masm) {
291 // The stack should look like this:
292 // ... keep1 | dest=42 | keep2 | RF | magic | handler | magic | recursive args |
293 // Check various invariants.
294 verify_offsets();
296 Register rdi_temp = rdi;
297 Register rcx_temp = rcx;
298 { __ push(rdi_temp); __ push(rcx_temp); }
299 #define UNPUSH_TEMPS \
300 { __ pop(rcx_temp); __ pop(rdi_temp); }
302 Address magic_number_1_addr = RicochetFrame::frame_address(RicochetFrame::magic_number_1_offset_in_bytes());
303 Address magic_number_2_addr = RicochetFrame::frame_address(RicochetFrame::magic_number_2_offset_in_bytes());
304 Address continuation_addr = RicochetFrame::frame_address(RicochetFrame::continuation_offset_in_bytes());
305 Address conversion_addr = RicochetFrame::frame_address(RicochetFrame::conversion_offset_in_bytes());
306 Address saved_args_base_addr = RicochetFrame::frame_address(RicochetFrame::saved_args_base_offset_in_bytes());
308 Label L_bad, L_ok;
309 BLOCK_COMMENT("verify_clean {");
310 // Magic numbers must check out:
311 __ cmpptr(magic_number_1_addr, (int32_t) MAGIC_NUMBER_1);
312 __ jcc(Assembler::notEqual, L_bad);
313 __ cmpptr(magic_number_2_addr, (int32_t) MAGIC_NUMBER_2);
314 __ jcc(Assembler::notEqual, L_bad);
316 // Arguments pointer must look reasonable:
317 __ movptr(rcx_temp, saved_args_base_addr);
318 __ cmpptr(rcx_temp, rbp);
319 __ jcc(Assembler::below, L_bad);
320 __ subptr(rcx_temp, UNREASONABLE_STACK_MOVE * Interpreter::stackElementSize);
321 __ cmpptr(rcx_temp, rbp);
322 __ jcc(Assembler::above, L_bad);
324 load_conversion_dest_type(_masm, rdi_temp, conversion_addr);
325 __ cmpl(rdi_temp, T_VOID);
326 __ jcc(Assembler::equal, L_ok);
327 __ movptr(rcx_temp, saved_args_base_addr);
328 load_conversion_vminfo(_masm, rdi_temp, conversion_addr);
329 __ cmpptr(Address(rcx_temp, rdi_temp, Interpreter::stackElementScale()),
330 (int32_t) RETURN_VALUE_PLACEHOLDER);
331 __ jcc(Assembler::equal, L_ok);
332 __ BIND(L_bad);
333 UNPUSH_TEMPS;
334 __ stop("damaged ricochet frame");
335 __ BIND(L_ok);
336 UNPUSH_TEMPS;
337 BLOCK_COMMENT("} verify_clean");
339 #undef UNPUSH_TEMPS
341 }
342 #endif //ASSERT
344 void MethodHandles::load_klass_from_Class(MacroAssembler* _masm, Register klass_reg) {
345 if (VerifyMethodHandles)
346 verify_klass(_masm, klass_reg, SystemDictionaryHandles::Class_klass(),
347 "AMH argument is a Class");
348 __ load_heap_oop(klass_reg, Address(klass_reg, java_lang_Class::klass_offset_in_bytes()));
349 }
351 void MethodHandles::load_conversion_vminfo(MacroAssembler* _masm, Register reg, Address conversion_field_addr) {
352 int bits = BitsPerByte;
353 int offset = (CONV_VMINFO_SHIFT / bits);
354 int shift = (CONV_VMINFO_SHIFT % bits);
355 __ load_unsigned_byte(reg, conversion_field_addr.plus_disp(offset));
356 assert(CONV_VMINFO_MASK == right_n_bits(bits - shift), "else change type of previous load");
357 assert(shift == 0, "no shift needed");
358 }
360 void MethodHandles::load_conversion_dest_type(MacroAssembler* _masm, Register reg, Address conversion_field_addr) {
361 int bits = BitsPerByte;
362 int offset = (CONV_DEST_TYPE_SHIFT / bits);
363 int shift = (CONV_DEST_TYPE_SHIFT % bits);
364 __ load_unsigned_byte(reg, conversion_field_addr.plus_disp(offset));
365 assert(CONV_TYPE_MASK == right_n_bits(bits - shift), "else change type of previous load");
366 __ shrl(reg, shift);
367 DEBUG_ONLY(int conv_type_bits = (int) exact_log2(CONV_TYPE_MASK+1));
368 assert((shift + conv_type_bits) == bits, "left justified in byte");
369 }
371 void MethodHandles::load_stack_move(MacroAssembler* _masm,
372 Register rdi_stack_move,
373 Register rcx_amh,
374 bool might_be_negative) {
375 BLOCK_COMMENT("load_stack_move {");
376 Address rcx_amh_conversion(rcx_amh, java_lang_invoke_AdapterMethodHandle::conversion_offset_in_bytes());
377 __ movl(rdi_stack_move, rcx_amh_conversion);
378 __ sarl(rdi_stack_move, CONV_STACK_MOVE_SHIFT);
379 #ifdef _LP64
380 if (might_be_negative) {
381 // clean high bits of stack motion register (was loaded as an int)
382 __ movslq(rdi_stack_move, rdi_stack_move);
383 }
384 #endif //_LP64
385 if (VerifyMethodHandles) {
386 Label L_ok, L_bad;
387 int32_t stack_move_limit = 0x4000; // extra-large
388 __ cmpptr(rdi_stack_move, stack_move_limit);
389 __ jcc(Assembler::greaterEqual, L_bad);
390 __ cmpptr(rdi_stack_move, -stack_move_limit);
391 __ jcc(Assembler::greater, L_ok);
392 __ bind(L_bad);
393 __ stop("load_stack_move of garbage value");
394 __ BIND(L_ok);
395 }
396 BLOCK_COMMENT("} load_stack_move");
397 }
399 #ifdef ASSERT
400 void MethodHandles::RicochetFrame::verify_offsets() {
401 // Check compatibility of this struct with the more generally used offsets of class frame:
402 int ebp_off = sender_link_offset_in_bytes(); // offset from struct base to local rbp value
403 assert(ebp_off + wordSize*frame::interpreter_frame_method_offset == saved_args_base_offset_in_bytes(), "");
404 assert(ebp_off + wordSize*frame::interpreter_frame_last_sp_offset == conversion_offset_in_bytes(), "");
405 assert(ebp_off + wordSize*frame::interpreter_frame_sender_sp_offset == exact_sender_sp_offset_in_bytes(), "");
406 // These last two have to be exact:
407 assert(ebp_off + wordSize*frame::link_offset == sender_link_offset_in_bytes(), "");
408 assert(ebp_off + wordSize*frame::return_addr_offset == sender_pc_offset_in_bytes(), "");
409 }
411 void MethodHandles::RicochetFrame::verify() const {
412 verify_offsets();
413 assert(magic_number_1() == MAGIC_NUMBER_1, "");
414 assert(magic_number_2() == MAGIC_NUMBER_2, "");
415 if (!Universe::heap()->is_gc_active()) {
416 if (saved_args_layout() != NULL) {
417 assert(saved_args_layout()->is_method(), "must be valid oop");
418 }
419 if (saved_target() != NULL) {
420 assert(java_lang_invoke_MethodHandle::is_instance(saved_target()), "checking frame value");
421 }
422 }
423 int conv_op = adapter_conversion_op(conversion());
424 assert(conv_op == java_lang_invoke_AdapterMethodHandle::OP_COLLECT_ARGS ||
425 conv_op == java_lang_invoke_AdapterMethodHandle::OP_FOLD_ARGS ||
426 conv_op == java_lang_invoke_AdapterMethodHandle::OP_PRIM_TO_REF,
427 "must be a sane conversion");
428 if (has_return_value_slot()) {
429 assert(*return_value_slot_addr() == RETURN_VALUE_PLACEHOLDER, "");
430 }
431 }
432 #endif //PRODUCT
434 #ifdef ASSERT
435 void MethodHandles::verify_argslot(MacroAssembler* _masm,
436 Register argslot_reg,
437 const char* error_message) {
438 // Verify that argslot lies within (rsp, rbp].
439 Label L_ok, L_bad;
440 BLOCK_COMMENT("verify_argslot {");
441 __ cmpptr(argslot_reg, rbp);
442 __ jccb(Assembler::above, L_bad);
443 __ cmpptr(rsp, argslot_reg);
444 __ jccb(Assembler::below, L_ok);
445 __ bind(L_bad);
446 __ stop(error_message);
447 __ BIND(L_ok);
448 BLOCK_COMMENT("} verify_argslot");
449 }
451 void MethodHandles::verify_argslots(MacroAssembler* _masm,
452 RegisterOrConstant arg_slots,
453 Register arg_slot_base_reg,
454 bool negate_argslots,
455 const char* error_message) {
456 // Verify that [argslot..argslot+size) lies within (rsp, rbp).
457 Label L_ok, L_bad;
458 Register rdi_temp = rdi;
459 BLOCK_COMMENT("verify_argslots {");
460 __ push(rdi_temp);
461 if (negate_argslots) {
462 if (arg_slots.is_constant()) {
463 arg_slots = -1 * arg_slots.as_constant();
464 } else {
465 __ movptr(rdi_temp, arg_slots);
466 __ negptr(rdi_temp);
467 arg_slots = rdi_temp;
468 }
469 }
470 __ lea(rdi_temp, Address(arg_slot_base_reg, arg_slots, Interpreter::stackElementScale()));
471 __ cmpptr(rdi_temp, rbp);
472 __ pop(rdi_temp);
473 __ jcc(Assembler::above, L_bad);
474 __ cmpptr(rsp, arg_slot_base_reg);
475 __ jcc(Assembler::below, L_ok);
476 __ bind(L_bad);
477 __ stop(error_message);
478 __ BIND(L_ok);
479 BLOCK_COMMENT("} verify_argslots");
480 }
482 // Make sure that arg_slots has the same sign as the given direction.
483 // If (and only if) arg_slots is a assembly-time constant, also allow it to be zero.
484 void MethodHandles::verify_stack_move(MacroAssembler* _masm,
485 RegisterOrConstant arg_slots, int direction) {
486 bool allow_zero = arg_slots.is_constant();
487 if (direction == 0) { direction = +1; allow_zero = true; }
488 assert(stack_move_unit() == -1, "else add extra checks here");
489 if (arg_slots.is_register()) {
490 Label L_ok, L_bad;
491 BLOCK_COMMENT("verify_stack_move {");
492 // testl(arg_slots.as_register(), -stack_move_unit() - 1); // no need
493 // jcc(Assembler::notZero, L_bad);
494 __ cmpptr(arg_slots.as_register(), (int32_t) NULL_WORD);
495 if (direction > 0) {
496 __ jcc(allow_zero ? Assembler::less : Assembler::lessEqual, L_bad);
497 __ cmpptr(arg_slots.as_register(), (int32_t) UNREASONABLE_STACK_MOVE);
498 __ jcc(Assembler::less, L_ok);
499 } else {
500 __ jcc(allow_zero ? Assembler::greater : Assembler::greaterEqual, L_bad);
501 __ cmpptr(arg_slots.as_register(), (int32_t) -UNREASONABLE_STACK_MOVE);
502 __ jcc(Assembler::greater, L_ok);
503 }
504 __ bind(L_bad);
505 if (direction > 0)
506 __ stop("assert arg_slots > 0");
507 else
508 __ stop("assert arg_slots < 0");
509 __ BIND(L_ok);
510 BLOCK_COMMENT("} verify_stack_move");
511 } else {
512 intptr_t size = arg_slots.as_constant();
513 if (direction < 0) size = -size;
514 assert(size >= 0, "correct direction of constant move");
515 assert(size < UNREASONABLE_STACK_MOVE, "reasonable size of constant move");
516 }
517 }
519 void MethodHandles::verify_klass(MacroAssembler* _masm,
520 Register obj, KlassHandle klass,
521 const char* error_message) {
522 oop* klass_addr = klass.raw_value();
523 assert(klass_addr >= SystemDictionaryHandles::Object_klass().raw_value() &&
524 klass_addr <= SystemDictionaryHandles::Long_klass().raw_value(),
525 "must be one of the SystemDictionaryHandles");
526 Register temp = rdi;
527 Label L_ok, L_bad;
528 BLOCK_COMMENT("verify_klass {");
529 __ verify_oop(obj);
530 __ testptr(obj, obj);
531 __ jcc(Assembler::zero, L_bad);
532 __ push(temp);
533 __ load_klass(temp, obj);
534 __ cmpptr(temp, ExternalAddress((address) klass_addr));
535 __ jcc(Assembler::equal, L_ok);
536 intptr_t super_check_offset = klass->super_check_offset();
537 __ movptr(temp, Address(temp, super_check_offset));
538 __ cmpptr(temp, ExternalAddress((address) klass_addr));
539 __ jcc(Assembler::equal, L_ok);
540 __ pop(temp);
541 __ bind(L_bad);
542 __ stop(error_message);
543 __ BIND(L_ok);
544 __ pop(temp);
545 BLOCK_COMMENT("} verify_klass");
546 }
547 #endif //ASSERT
549 // Code generation
550 address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm) {
551 // rbx: methodOop
552 // rcx: receiver method handle (must load from sp[MethodTypeForm.vmslots])
553 // rsi/r13: sender SP (must preserve; see prepare_to_jump_from_interpreted)
554 // rdx, rdi: garbage temp, blown away
556 Register rbx_method = rbx;
557 Register rcx_recv = rcx;
558 Register rax_mtype = rax;
559 Register rdx_temp = rdx;
560 Register rdi_temp = rdi;
562 // emit WrongMethodType path first, to enable jccb back-branch from main path
563 Label wrong_method_type;
564 __ bind(wrong_method_type);
565 Label invoke_generic_slow_path, invoke_exact_error_path;
566 assert(methodOopDesc::intrinsic_id_size_in_bytes() == sizeof(u1), "");;
567 __ cmpb(Address(rbx_method, methodOopDesc::intrinsic_id_offset_in_bytes()), (int) vmIntrinsics::_invokeExact);
568 __ jcc(Assembler::notEqual, invoke_generic_slow_path);
569 __ jmp(invoke_exact_error_path);
571 // here's where control starts out:
572 __ align(CodeEntryAlignment);
573 address entry_point = __ pc();
575 // fetch the MethodType from the method handle into rax (the 'check' register)
576 // FIXME: Interpreter should transmit pre-popped stack pointer, to locate base of arg list.
577 // This would simplify several touchy bits of code.
578 // See 6984712: JSR 292 method handle calls need a clean argument base pointer
579 {
580 Register tem = rbx_method;
581 for (jint* pchase = methodOopDesc::method_type_offsets_chain(); (*pchase) != -1; pchase++) {
582 __ movptr(rax_mtype, Address(tem, *pchase));
583 tem = rax_mtype; // in case there is another indirection
584 }
585 }
587 // given the MethodType, find out where the MH argument is buried
588 __ load_heap_oop(rdx_temp, Address(rax_mtype, __ delayed_value(java_lang_invoke_MethodType::form_offset_in_bytes, rdi_temp)));
589 Register rdx_vmslots = rdx_temp;
590 __ movl(rdx_vmslots, Address(rdx_temp, __ delayed_value(java_lang_invoke_MethodTypeForm::vmslots_offset_in_bytes, rdi_temp)));
591 Address mh_receiver_slot_addr = __ argument_address(rdx_vmslots);
592 __ movptr(rcx_recv, mh_receiver_slot_addr);
594 trace_method_handle(_masm, "invokeExact");
596 __ check_method_handle_type(rax_mtype, rcx_recv, rdi_temp, wrong_method_type);
598 // Nobody uses the MH receiver slot after this. Make sure.
599 DEBUG_ONLY(__ movptr(mh_receiver_slot_addr, (int32_t)0x999999));
601 __ jump_to_method_handle_entry(rcx_recv, rdi_temp);
603 // error path for invokeExact (only)
604 __ bind(invoke_exact_error_path);
605 // jump(ExternalAddress(Interpreter::throw_WrongMethodType_entry()));
606 Register rdx_last_Java_sp = rdx_temp;
607 __ lea(rdx_last_Java_sp, __ argument_address(constant(0)));
608 __ super_call_VM(noreg,
609 rdx_last_Java_sp,
610 CAST_FROM_FN_PTR(address,
611 InterpreterRuntime::throw_WrongMethodTypeException),
612 // pass required type, then failing mh object
613 rax_mtype, rcx_recv);
615 // for invokeGeneric (only), apply argument and result conversions on the fly
616 __ bind(invoke_generic_slow_path);
617 #ifdef ASSERT
618 if (VerifyMethodHandles) {
619 Label L;
620 __ cmpb(Address(rbx_method, methodOopDesc::intrinsic_id_offset_in_bytes()), (int) vmIntrinsics::_invokeGeneric);
621 __ jcc(Assembler::equal, L);
622 __ stop("bad methodOop::intrinsic_id");
623 __ bind(L);
624 }
625 #endif //ASSERT
626 Register rbx_temp = rbx_method; // don't need it now
628 // make room on the stack for another pointer:
629 Register rcx_argslot = rcx_recv;
630 __ lea(rcx_argslot, __ argument_address(rdx_vmslots, 1));
631 insert_arg_slots(_masm, 2 * stack_move_unit(),
632 rcx_argslot, rbx_temp, rdx_temp);
634 // load up an adapter from the calling type (Java weaves this)
635 Register rdx_adapter = rdx_temp;
636 __ load_heap_oop(rdx_temp, Address(rax_mtype, __ delayed_value(java_lang_invoke_MethodType::form_offset_in_bytes, rdi_temp)));
637 __ load_heap_oop(rdx_adapter, Address(rdx_temp, __ delayed_value(java_lang_invoke_MethodTypeForm::genericInvoker_offset_in_bytes, rdi_temp)));
638 __ verify_oop(rdx_adapter);
639 __ movptr(Address(rcx_argslot, 1 * Interpreter::stackElementSize), rdx_adapter);
640 // As a trusted first argument, pass the type being called, so the adapter knows
641 // the actual types of the arguments and return values.
642 // (Generic invokers are shared among form-families of method-type.)
643 __ movptr(Address(rcx_argslot, 0 * Interpreter::stackElementSize), rax_mtype);
644 // FIXME: assert that rdx_adapter is of the right method-type.
645 __ mov(rcx, rdx_adapter);
646 trace_method_handle(_masm, "invokeGeneric");
647 __ jump_to_method_handle_entry(rcx, rdi_temp);
649 return entry_point;
650 }
652 // Helper to insert argument slots into the stack.
653 // arg_slots must be a multiple of stack_move_unit() and < 0
654 // rax_argslot is decremented to point to the new (shifted) location of the argslot
655 // But, rdx_temp ends up holding the original value of rax_argslot.
656 void MethodHandles::insert_arg_slots(MacroAssembler* _masm,
657 RegisterOrConstant arg_slots,
658 Register rax_argslot,
659 Register rbx_temp, Register rdx_temp) {
660 // allow constant zero
661 if (arg_slots.is_constant() && arg_slots.as_constant() == 0)
662 return;
663 assert_different_registers(rax_argslot, rbx_temp, rdx_temp,
664 (!arg_slots.is_register() ? rsp : arg_slots.as_register()));
665 if (VerifyMethodHandles)
666 verify_argslot(_masm, rax_argslot, "insertion point must fall within current frame");
667 if (VerifyMethodHandles)
668 verify_stack_move(_masm, arg_slots, -1);
670 // Make space on the stack for the inserted argument(s).
671 // Then pull down everything shallower than rax_argslot.
672 // The stacked return address gets pulled down with everything else.
673 // That is, copy [rsp, argslot) downward by -size words. In pseudo-code:
674 // rsp -= size;
675 // for (rdx = rsp + size; rdx < argslot; rdx++)
676 // rdx[-size] = rdx[0]
677 // argslot -= size;
678 BLOCK_COMMENT("insert_arg_slots {");
679 __ mov(rdx_temp, rsp); // source pointer for copy
680 __ lea(rsp, Address(rsp, arg_slots, Interpreter::stackElementScale()));
681 {
682 Label loop;
683 __ BIND(loop);
684 // pull one word down each time through the loop
685 __ movptr(rbx_temp, Address(rdx_temp, 0));
686 __ movptr(Address(rdx_temp, arg_slots, Interpreter::stackElementScale()), rbx_temp);
687 __ addptr(rdx_temp, wordSize);
688 __ cmpptr(rdx_temp, rax_argslot);
689 __ jcc(Assembler::below, loop);
690 }
692 // Now move the argslot down, to point to the opened-up space.
693 __ lea(rax_argslot, Address(rax_argslot, arg_slots, Interpreter::stackElementScale()));
694 BLOCK_COMMENT("} insert_arg_slots");
695 }
697 // Helper to remove argument slots from the stack.
698 // arg_slots must be a multiple of stack_move_unit() and > 0
699 void MethodHandles::remove_arg_slots(MacroAssembler* _masm,
700 RegisterOrConstant arg_slots,
701 Register rax_argslot,
702 Register rbx_temp, Register rdx_temp) {
703 // allow constant zero
704 if (arg_slots.is_constant() && arg_slots.as_constant() == 0)
705 return;
706 assert_different_registers(rax_argslot, rbx_temp, rdx_temp,
707 (!arg_slots.is_register() ? rsp : arg_slots.as_register()));
708 if (VerifyMethodHandles)
709 verify_argslots(_masm, arg_slots, rax_argslot, false,
710 "deleted argument(s) must fall within current frame");
711 if (VerifyMethodHandles)
712 verify_stack_move(_masm, arg_slots, +1);
714 BLOCK_COMMENT("remove_arg_slots {");
715 // Pull up everything shallower than rax_argslot.
716 // Then remove the excess space on the stack.
717 // The stacked return address gets pulled up with everything else.
718 // That is, copy [rsp, argslot) upward by size words. In pseudo-code:
719 // for (rdx = argslot-1; rdx >= rsp; --rdx)
720 // rdx[size] = rdx[0]
721 // argslot += size;
722 // rsp += size;
723 __ lea(rdx_temp, Address(rax_argslot, -wordSize)); // source pointer for copy
724 {
725 Label loop;
726 __ BIND(loop);
727 // pull one word up each time through the loop
728 __ movptr(rbx_temp, Address(rdx_temp, 0));
729 __ movptr(Address(rdx_temp, arg_slots, Interpreter::stackElementScale()), rbx_temp);
730 __ addptr(rdx_temp, -wordSize);
731 __ cmpptr(rdx_temp, rsp);
732 __ jcc(Assembler::aboveEqual, loop);
733 }
735 // Now move the argslot up, to point to the just-copied block.
736 __ lea(rsp, Address(rsp, arg_slots, Interpreter::stackElementScale()));
737 // And adjust the argslot address to point at the deletion point.
738 __ lea(rax_argslot, Address(rax_argslot, arg_slots, Interpreter::stackElementScale()));
739 BLOCK_COMMENT("} remove_arg_slots");
740 }
742 // Helper to copy argument slots to the top of the stack.
743 // The sequence starts with rax_argslot and is counted by slot_count
744 // slot_count must be a multiple of stack_move_unit() and >= 0
745 // This function blows the temps but does not change rax_argslot.
746 void MethodHandles::push_arg_slots(MacroAssembler* _masm,
747 Register rax_argslot,
748 RegisterOrConstant slot_count,
749 int skip_words_count,
750 Register rbx_temp, Register rdx_temp) {
751 assert_different_registers(rax_argslot, rbx_temp, rdx_temp,
752 (!slot_count.is_register() ? rbp : slot_count.as_register()),
753 rsp);
754 assert(Interpreter::stackElementSize == wordSize, "else change this code");
756 if (VerifyMethodHandles)
757 verify_stack_move(_masm, slot_count, 0);
759 // allow constant zero
760 if (slot_count.is_constant() && slot_count.as_constant() == 0)
761 return;
763 BLOCK_COMMENT("push_arg_slots {");
765 Register rbx_top = rbx_temp;
767 // There is at most 1 word to carry down with the TOS.
768 switch (skip_words_count) {
769 case 1: __ pop(rdx_temp); break;
770 case 0: break;
771 default: ShouldNotReachHere();
772 }
774 if (slot_count.is_constant()) {
775 for (int i = slot_count.as_constant() - 1; i >= 0; i--) {
776 __ pushptr(Address(rax_argslot, i * wordSize));
777 }
778 } else {
779 Label L_plural, L_loop, L_break;
780 // Emit code to dynamically check for the common cases, zero and one slot.
781 __ cmpl(slot_count.as_register(), (int32_t) 1);
782 __ jccb(Assembler::greater, L_plural);
783 __ jccb(Assembler::less, L_break);
784 __ pushptr(Address(rax_argslot, 0));
785 __ jmpb(L_break);
786 __ BIND(L_plural);
788 // Loop for 2 or more:
789 // rbx = &rax[slot_count]
790 // while (rbx > rax) *(--rsp) = *(--rbx)
791 __ lea(rbx_top, Address(rax_argslot, slot_count, Address::times_ptr));
792 __ BIND(L_loop);
793 __ subptr(rbx_top, wordSize);
794 __ pushptr(Address(rbx_top, 0));
795 __ cmpptr(rbx_top, rax_argslot);
796 __ jcc(Assembler::above, L_loop);
797 __ bind(L_break);
798 }
799 switch (skip_words_count) {
800 case 1: __ push(rdx_temp); break;
801 case 0: break;
802 default: ShouldNotReachHere();
803 }
804 BLOCK_COMMENT("} push_arg_slots");
805 }
807 // in-place movement; no change to rsp
808 // blows rax_temp, rdx_temp
809 void MethodHandles::move_arg_slots_up(MacroAssembler* _masm,
810 Register rbx_bottom, // invariant
811 Address top_addr, // can use rax_temp
812 RegisterOrConstant positive_distance_in_slots,
813 Register rax_temp, Register rdx_temp) {
814 BLOCK_COMMENT("move_arg_slots_up {");
815 assert_different_registers(rbx_bottom,
816 rax_temp, rdx_temp,
817 positive_distance_in_slots.register_or_noreg());
818 Label L_loop, L_break;
819 Register rax_top = rax_temp;
820 if (!top_addr.is_same_address(Address(rax_top, 0)))
821 __ lea(rax_top, top_addr);
822 // Detect empty (or broken) loop:
823 #ifdef ASSERT
824 if (VerifyMethodHandles) {
825 // Verify that &bottom < &top (non-empty interval)
826 Label L_ok, L_bad;
827 if (positive_distance_in_slots.is_register()) {
828 __ cmpptr(positive_distance_in_slots.as_register(), (int32_t) 0);
829 __ jcc(Assembler::lessEqual, L_bad);
830 }
831 __ cmpptr(rbx_bottom, rax_top);
832 __ jcc(Assembler::below, L_ok);
833 __ bind(L_bad);
834 __ stop("valid bounds (copy up)");
835 __ BIND(L_ok);
836 }
837 #endif
838 __ cmpptr(rbx_bottom, rax_top);
839 __ jccb(Assembler::aboveEqual, L_break);
840 // work rax down to rbx, copying contiguous data upwards
841 // In pseudo-code:
842 // [rbx, rax) = &[bottom, top)
843 // while (--rax >= rbx) *(rax + distance) = *(rax + 0), rax--;
844 __ BIND(L_loop);
845 __ subptr(rax_top, wordSize);
846 __ movptr(rdx_temp, Address(rax_top, 0));
847 __ movptr( Address(rax_top, positive_distance_in_slots, Address::times_ptr), rdx_temp);
848 __ cmpptr(rax_top, rbx_bottom);
849 __ jcc(Assembler::above, L_loop);
850 assert(Interpreter::stackElementSize == wordSize, "else change loop");
851 __ bind(L_break);
852 BLOCK_COMMENT("} move_arg_slots_up");
853 }
855 // in-place movement; no change to rsp
856 // blows rax_temp, rdx_temp
857 void MethodHandles::move_arg_slots_down(MacroAssembler* _masm,
858 Address bottom_addr, // can use rax_temp
859 Register rbx_top, // invariant
860 RegisterOrConstant negative_distance_in_slots,
861 Register rax_temp, Register rdx_temp) {
862 BLOCK_COMMENT("move_arg_slots_down {");
863 assert_different_registers(rbx_top,
864 negative_distance_in_slots.register_or_noreg(),
865 rax_temp, rdx_temp);
866 Label L_loop, L_break;
867 Register rax_bottom = rax_temp;
868 if (!bottom_addr.is_same_address(Address(rax_bottom, 0)))
869 __ lea(rax_bottom, bottom_addr);
870 // Detect empty (or broken) loop:
871 #ifdef ASSERT
872 assert(!negative_distance_in_slots.is_constant() || negative_distance_in_slots.as_constant() < 0, "");
873 if (VerifyMethodHandles) {
874 // Verify that &bottom < &top (non-empty interval)
875 Label L_ok, L_bad;
876 if (negative_distance_in_slots.is_register()) {
877 __ cmpptr(negative_distance_in_slots.as_register(), (int32_t) 0);
878 __ jcc(Assembler::greaterEqual, L_bad);
879 }
880 __ cmpptr(rax_bottom, rbx_top);
881 __ jcc(Assembler::below, L_ok);
882 __ bind(L_bad);
883 __ stop("valid bounds (copy down)");
884 __ BIND(L_ok);
885 }
886 #endif
887 __ cmpptr(rax_bottom, rbx_top);
888 __ jccb(Assembler::aboveEqual, L_break);
889 // work rax up to rbx, copying contiguous data downwards
890 // In pseudo-code:
891 // [rax, rbx) = &[bottom, top)
892 // while (rax < rbx) *(rax - distance) = *(rax + 0), rax++;
893 __ BIND(L_loop);
894 __ movptr(rdx_temp, Address(rax_bottom, 0));
895 __ movptr( Address(rax_bottom, negative_distance_in_slots, Address::times_ptr), rdx_temp);
896 __ addptr(rax_bottom, wordSize);
897 __ cmpptr(rax_bottom, rbx_top);
898 __ jcc(Assembler::below, L_loop);
899 assert(Interpreter::stackElementSize == wordSize, "else change loop");
900 __ bind(L_break);
901 BLOCK_COMMENT("} move_arg_slots_down");
902 }
904 // Copy from a field or array element to a stacked argument slot.
905 // is_element (ignored) says whether caller is loading an array element instead of an instance field.
906 void MethodHandles::move_typed_arg(MacroAssembler* _masm,
907 BasicType type, bool is_element,
908 Address slot_dest, Address value_src,
909 Register rbx_temp, Register rdx_temp) {
910 BLOCK_COMMENT(!is_element ? "move_typed_arg {" : "move_typed_arg { (array element)");
911 if (type == T_OBJECT || type == T_ARRAY) {
912 __ load_heap_oop(rbx_temp, value_src);
913 __ movptr(slot_dest, rbx_temp);
914 } else if (type != T_VOID) {
915 int arg_size = type2aelembytes(type);
916 bool arg_is_signed = is_signed_subword_type(type);
917 int slot_size = (arg_size > wordSize) ? arg_size : wordSize;
918 __ load_sized_value( rdx_temp, value_src, arg_size, arg_is_signed, rbx_temp);
919 __ store_sized_value( slot_dest, rdx_temp, slot_size, rbx_temp);
920 }
921 BLOCK_COMMENT("} move_typed_arg");
922 }
924 void MethodHandles::move_return_value(MacroAssembler* _masm, BasicType type,
925 Address return_slot) {
926 BLOCK_COMMENT("move_return_value {");
927 // Old versions of the JVM must clean the FPU stack after every return.
928 #ifndef _LP64
929 #ifdef COMPILER2
930 // The FPU stack is clean if UseSSE >= 2 but must be cleaned in other cases
931 if ((type == T_FLOAT && UseSSE < 1) || (type == T_DOUBLE && UseSSE < 2)) {
932 for (int i = 1; i < 8; i++) {
933 __ ffree(i);
934 }
935 } else if (UseSSE < 2) {
936 __ empty_FPU_stack();
937 }
938 #endif //COMPILER2
939 #endif //!_LP64
941 // Look at the type and pull the value out of the corresponding register.
942 if (type == T_VOID) {
943 // nothing to do
944 } else if (type == T_OBJECT) {
945 __ movptr(return_slot, rax);
946 } else if (type == T_INT || is_subword_type(type)) {
947 // write the whole word, even if only 32 bits is significant
948 __ movptr(return_slot, rax);
949 } else if (type == T_LONG) {
950 // store the value by parts
951 // Note: We assume longs are continguous (if misaligned) on the interpreter stack.
952 __ store_sized_value(return_slot, rax, BytesPerLong, rdx);
953 } else if (NOT_LP64((type == T_FLOAT && UseSSE < 1) ||
954 (type == T_DOUBLE && UseSSE < 2) ||)
955 false) {
956 // Use old x86 FPU registers:
957 if (type == T_FLOAT)
958 __ fstp_s(return_slot);
959 else
960 __ fstp_d(return_slot);
961 } else if (type == T_FLOAT) {
962 __ movflt(return_slot, xmm0);
963 } else if (type == T_DOUBLE) {
964 __ movdbl(return_slot, xmm0);
965 } else {
966 ShouldNotReachHere();
967 }
968 BLOCK_COMMENT("} move_return_value");
969 }
972 #ifndef PRODUCT
973 extern "C" void print_method_handle(oop mh);
974 void trace_method_handle_stub(const char* adaptername,
975 oop mh,
976 intptr_t* saved_regs,
977 intptr_t* entry_sp,
978 intptr_t* saved_sp,
979 intptr_t* saved_bp) {
980 // called as a leaf from native code: do not block the JVM!
981 bool has_mh = (strstr(adaptername, "return/") == NULL); // return adapters don't have rcx_mh
982 intptr_t* last_sp = (intptr_t*) saved_bp[frame::interpreter_frame_last_sp_offset];
983 intptr_t* base_sp = last_sp;
984 typedef MethodHandles::RicochetFrame RicochetFrame;
985 RicochetFrame* rfp = (RicochetFrame*)((address)saved_bp - RicochetFrame::sender_link_offset_in_bytes());
986 if (!UseRicochetFrames || Universe::heap()->is_in((address) rfp->saved_args_base())) {
987 // Probably an interpreter frame.
988 base_sp = (intptr_t*) saved_bp[frame::interpreter_frame_monitor_block_top_offset];
989 }
990 intptr_t mh_reg = (intptr_t)mh;
991 const char* mh_reg_name = "rcx_mh";
992 if (!has_mh) mh_reg_name = "rcx";
993 tty->print_cr("MH %s %s="PTR_FORMAT" sp=("PTR_FORMAT"+"INTX_FORMAT") stack_size="INTX_FORMAT" bp="PTR_FORMAT,
994 adaptername, mh_reg_name, mh_reg,
995 (intptr_t)entry_sp, (intptr_t)(saved_sp - entry_sp), (intptr_t)(base_sp - last_sp), (intptr_t)saved_bp);
996 if (Verbose) {
997 tty->print(" reg dump: ");
998 int saved_regs_count = (entry_sp-1) - saved_regs;
999 // 32 bit: rdi rsi rbp rsp; rbx rdx rcx (*) rax
1000 int i;
1001 for (i = 0; i <= saved_regs_count; i++) {
1002 if (i > 0 && i % 4 == 0 && i != saved_regs_count) {
1003 tty->cr();
1004 tty->print(" + dump: ");
1005 }
1006 tty->print(" %d: "PTR_FORMAT, i, saved_regs[i]);
1007 }
1008 tty->cr();
1009 if (last_sp != saved_sp && last_sp != NULL)
1010 tty->print_cr("*** last_sp="PTR_FORMAT, (intptr_t)last_sp);
1011 int stack_dump_count = 16;
1012 if (stack_dump_count < (int)(saved_bp + 2 - saved_sp))
1013 stack_dump_count = (int)(saved_bp + 2 - saved_sp);
1014 if (stack_dump_count > 64) stack_dump_count = 48;
1015 for (i = 0; i < stack_dump_count; i += 4) {
1016 tty->print_cr(" dump at SP[%d] "PTR_FORMAT": "PTR_FORMAT" "PTR_FORMAT" "PTR_FORMAT" "PTR_FORMAT,
1017 i, (intptr_t) &entry_sp[i+0], entry_sp[i+0], entry_sp[i+1], entry_sp[i+2], entry_sp[i+3]);
1018 }
1019 if (has_mh)
1020 print_method_handle(mh);
1021 }
1022 }
1024 // The stub wraps the arguments in a struct on the stack to avoid
1025 // dealing with the different calling conventions for passing 6
1026 // arguments.
1027 struct MethodHandleStubArguments {
1028 const char* adaptername;
1029 oopDesc* mh;
1030 intptr_t* saved_regs;
1031 intptr_t* entry_sp;
1032 intptr_t* saved_sp;
1033 intptr_t* saved_bp;
1034 };
1035 void trace_method_handle_stub_wrapper(MethodHandleStubArguments* args) {
1036 trace_method_handle_stub(args->adaptername,
1037 args->mh,
1038 args->saved_regs,
1039 args->entry_sp,
1040 args->saved_sp,
1041 args->saved_bp);
1042 }
1044 void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) {
1045 if (!TraceMethodHandles) return;
1046 BLOCK_COMMENT("trace_method_handle {");
1047 __ push(rax);
1048 __ lea(rax, Address(rsp, wordSize * NOT_LP64(6) LP64_ONLY(14))); // entry_sp __ pusha();
1049 __ pusha();
1050 __ mov(rbx, rsp);
1051 __ enter();
1052 // incoming state:
1053 // rcx: method handle
1054 // r13 or rsi: saved sp
1055 // To avoid calling convention issues, build a record on the stack and pass the pointer to that instead.
1056 __ push(rbp); // saved_bp
1057 __ push(rsi); // saved_sp
1058 __ push(rax); // entry_sp
1059 __ push(rbx); // pusha saved_regs
1060 __ push(rcx); // mh
1061 __ push(rcx); // adaptername
1062 __ movptr(Address(rsp, 0), (intptr_t) adaptername);
1063 __ super_call_VM_leaf(CAST_FROM_FN_PTR(address, trace_method_handle_stub_wrapper), rsp);
1064 __ leave();
1065 __ popa();
1066 __ pop(rax);
1067 BLOCK_COMMENT("} trace_method_handle");
1068 }
1069 #endif //PRODUCT
1071 // which conversion op types are implemented here?
1072 int MethodHandles::adapter_conversion_ops_supported_mask() {
1073 return ((1<<java_lang_invoke_AdapterMethodHandle::OP_RETYPE_ONLY)
1074 |(1<<java_lang_invoke_AdapterMethodHandle::OP_RETYPE_RAW)
1075 |(1<<java_lang_invoke_AdapterMethodHandle::OP_CHECK_CAST)
1076 |(1<<java_lang_invoke_AdapterMethodHandle::OP_PRIM_TO_PRIM)
1077 |(1<<java_lang_invoke_AdapterMethodHandle::OP_REF_TO_PRIM)
1078 //OP_PRIM_TO_REF is below...
1079 |(1<<java_lang_invoke_AdapterMethodHandle::OP_SWAP_ARGS)
1080 |(1<<java_lang_invoke_AdapterMethodHandle::OP_ROT_ARGS)
1081 |(1<<java_lang_invoke_AdapterMethodHandle::OP_DUP_ARGS)
1082 |(1<<java_lang_invoke_AdapterMethodHandle::OP_DROP_ARGS)
1083 //OP_COLLECT_ARGS is below...
1084 |(1<<java_lang_invoke_AdapterMethodHandle::OP_SPREAD_ARGS)
1085 |(!UseRicochetFrames ? 0 :
1086 java_lang_invoke_MethodTypeForm::vmlayout_offset_in_bytes() <= 0 ? 0 :
1087 ((1<<java_lang_invoke_AdapterMethodHandle::OP_PRIM_TO_REF)
1088 |(1<<java_lang_invoke_AdapterMethodHandle::OP_COLLECT_ARGS)
1089 |(1<<java_lang_invoke_AdapterMethodHandle::OP_FOLD_ARGS)
1090 ))
1091 );
1092 }
1094 //------------------------------------------------------------------------------
1095 // MethodHandles::generate_method_handle_stub
1096 //
1097 // Generate an "entry" field for a method handle.
1098 // This determines how the method handle will respond to calls.
1099 void MethodHandles::generate_method_handle_stub(MacroAssembler* _masm, MethodHandles::EntryKind ek) {
1100 MethodHandles::EntryKind ek_orig = ek_original_kind(ek);
1102 // Here is the register state during an interpreted call,
1103 // as set up by generate_method_handle_interpreter_entry():
1104 // - rbx: garbage temp (was MethodHandle.invoke methodOop, unused)
1105 // - rcx: receiver method handle
1106 // - rax: method handle type (only used by the check_mtype entry point)
1107 // - rsi/r13: sender SP (must preserve; see prepare_to_jump_from_interpreted)
1108 // - rdx: garbage temp, can blow away
1110 const Register rcx_recv = rcx;
1111 const Register rax_argslot = rax;
1112 const Register rbx_temp = rbx;
1113 const Register rdx_temp = rdx;
1114 const Register rdi_temp = rdi;
1116 // This guy is set up by prepare_to_jump_from_interpreted (from interpreted calls)
1117 // and gen_c2i_adapter (from compiled calls):
1118 const Register saved_last_sp = saved_last_sp_register();
1120 // Argument registers for _raise_exception.
1121 // 32-bit: Pass first two oop/int args in registers ECX and EDX.
1122 const Register rarg0_code = LP64_ONLY(j_rarg0) NOT_LP64(rcx);
1123 const Register rarg1_actual = LP64_ONLY(j_rarg1) NOT_LP64(rdx);
1124 const Register rarg2_required = LP64_ONLY(j_rarg2) NOT_LP64(rdi);
1125 assert_different_registers(rarg0_code, rarg1_actual, rarg2_required, saved_last_sp);
1127 guarantee(java_lang_invoke_MethodHandle::vmentry_offset_in_bytes() != 0, "must have offsets");
1129 // some handy addresses
1130 Address rbx_method_fie( rbx, methodOopDesc::from_interpreted_offset() );
1131 Address rbx_method_fce( rbx, methodOopDesc::from_compiled_offset() );
1133 Address rcx_mh_vmtarget( rcx_recv, java_lang_invoke_MethodHandle::vmtarget_offset_in_bytes() );
1134 Address rcx_dmh_vmindex( rcx_recv, java_lang_invoke_DirectMethodHandle::vmindex_offset_in_bytes() );
1136 Address rcx_bmh_vmargslot( rcx_recv, java_lang_invoke_BoundMethodHandle::vmargslot_offset_in_bytes() );
1137 Address rcx_bmh_argument( rcx_recv, java_lang_invoke_BoundMethodHandle::argument_offset_in_bytes() );
1139 Address rcx_amh_vmargslot( rcx_recv, java_lang_invoke_AdapterMethodHandle::vmargslot_offset_in_bytes() );
1140 Address rcx_amh_argument( rcx_recv, java_lang_invoke_AdapterMethodHandle::argument_offset_in_bytes() );
1141 Address rcx_amh_conversion( rcx_recv, java_lang_invoke_AdapterMethodHandle::conversion_offset_in_bytes() );
1142 Address vmarg; // __ argument_address(vmargslot)
1144 const int java_mirror_offset = klassOopDesc::klass_part_offset_in_bytes() + Klass::java_mirror_offset_in_bytes();
1146 if (have_entry(ek)) {
1147 __ nop(); // empty stubs make SG sick
1148 return;
1149 }
1151 #ifdef ASSERT
1152 __ push((int32_t) 0xEEEEEEEE);
1153 __ push((int32_t) (intptr_t) entry_name(ek));
1154 LP64_ONLY(__ push((int32_t) high((intptr_t) entry_name(ek))));
1155 __ push((int32_t) 0x33333333);
1156 #endif //ASSERT
1158 address interp_entry = __ pc();
1160 trace_method_handle(_masm, entry_name(ek));
1162 BLOCK_COMMENT(err_msg("Entry %s {", entry_name(ek)));
1164 switch ((int) ek) {
1165 case _raise_exception:
1166 {
1167 // Not a real MH entry, but rather shared code for raising an
1168 // exception. Since we use the compiled entry, arguments are
1169 // expected in compiler argument registers.
1170 assert(raise_exception_method(), "must be set");
1171 assert(raise_exception_method()->from_compiled_entry(), "method must be linked");
1173 const Register rdi_pc = rax;
1174 __ pop(rdi_pc); // caller PC
1175 __ mov(rsp, saved_last_sp); // cut the stack back to where the caller started
1177 Register rbx_method = rbx_temp;
1178 Label L_no_method;
1179 // FIXME: fill in _raise_exception_method with a suitable java.lang.invoke method
1180 __ movptr(rbx_method, ExternalAddress((address) &_raise_exception_method));
1181 __ testptr(rbx_method, rbx_method);
1182 __ jccb(Assembler::zero, L_no_method);
1184 const int jobject_oop_offset = 0;
1185 __ movptr(rbx_method, Address(rbx_method, jobject_oop_offset)); // dereference the jobject
1186 __ testptr(rbx_method, rbx_method);
1187 __ jccb(Assembler::zero, L_no_method);
1188 __ verify_oop(rbx_method);
1190 NOT_LP64(__ push(rarg2_required));
1191 __ push(rdi_pc); // restore caller PC
1192 __ jmp(rbx_method_fce); // jump to compiled entry
1194 // Do something that is at least causes a valid throw from the interpreter.
1195 __ bind(L_no_method);
1196 __ push(rarg2_required);
1197 __ push(rarg1_actual);
1198 __ jump(ExternalAddress(Interpreter::throw_WrongMethodType_entry()));
1199 }
1200 break;
1202 case _invokestatic_mh:
1203 case _invokespecial_mh:
1204 {
1205 Register rbx_method = rbx_temp;
1206 __ load_heap_oop(rbx_method, rcx_mh_vmtarget); // target is a methodOop
1207 __ verify_oop(rbx_method);
1208 // same as TemplateTable::invokestatic or invokespecial,
1209 // minus the CP setup and profiling:
1210 if (ek == _invokespecial_mh) {
1211 // Must load & check the first argument before entering the target method.
1212 __ load_method_handle_vmslots(rax_argslot, rcx_recv, rdx_temp);
1213 __ movptr(rcx_recv, __ argument_address(rax_argslot, -1));
1214 __ null_check(rcx_recv);
1215 __ verify_oop(rcx_recv);
1216 }
1217 __ jmp(rbx_method_fie);
1218 }
1219 break;
1221 case _invokevirtual_mh:
1222 {
1223 // same as TemplateTable::invokevirtual,
1224 // minus the CP setup and profiling:
1226 // pick out the vtable index and receiver offset from the MH,
1227 // and then we can discard it:
1228 __ load_method_handle_vmslots(rax_argslot, rcx_recv, rdx_temp);
1229 Register rbx_index = rbx_temp;
1230 __ movl(rbx_index, rcx_dmh_vmindex);
1231 // Note: The verifier allows us to ignore rcx_mh_vmtarget.
1232 __ movptr(rcx_recv, __ argument_address(rax_argslot, -1));
1233 __ null_check(rcx_recv, oopDesc::klass_offset_in_bytes());
1235 // get receiver klass
1236 Register rax_klass = rax_argslot;
1237 __ load_klass(rax_klass, rcx_recv);
1238 __ verify_oop(rax_klass);
1240 // get target methodOop & entry point
1241 const int base = instanceKlass::vtable_start_offset() * wordSize;
1242 assert(vtableEntry::size() * wordSize == wordSize, "adjust the scaling in the code below");
1243 Address vtable_entry_addr(rax_klass,
1244 rbx_index, Address::times_ptr,
1245 base + vtableEntry::method_offset_in_bytes());
1246 Register rbx_method = rbx_temp;
1247 __ movptr(rbx_method, vtable_entry_addr);
1249 __ verify_oop(rbx_method);
1250 __ jmp(rbx_method_fie);
1251 }
1252 break;
1254 case _invokeinterface_mh:
1255 {
1256 // same as TemplateTable::invokeinterface,
1257 // minus the CP setup and profiling:
1259 // pick out the interface and itable index from the MH.
1260 __ load_method_handle_vmslots(rax_argslot, rcx_recv, rdx_temp);
1261 Register rdx_intf = rdx_temp;
1262 Register rbx_index = rbx_temp;
1263 __ load_heap_oop(rdx_intf, rcx_mh_vmtarget);
1264 __ movl(rbx_index, rcx_dmh_vmindex);
1265 __ movptr(rcx_recv, __ argument_address(rax_argslot, -1));
1266 __ null_check(rcx_recv, oopDesc::klass_offset_in_bytes());
1268 // get receiver klass
1269 Register rax_klass = rax_argslot;
1270 __ load_klass(rax_klass, rcx_recv);
1271 __ verify_oop(rax_klass);
1273 Register rbx_method = rbx_index;
1275 // get interface klass
1276 Label no_such_interface;
1277 __ verify_oop(rdx_intf);
1278 __ lookup_interface_method(rax_klass, rdx_intf,
1279 // note: next two args must be the same:
1280 rbx_index, rbx_method,
1281 rdi_temp,
1282 no_such_interface);
1284 __ verify_oop(rbx_method);
1285 __ jmp(rbx_method_fie);
1286 __ hlt();
1288 __ bind(no_such_interface);
1289 // Throw an exception.
1290 // For historical reasons, it will be IncompatibleClassChangeError.
1291 __ mov(rbx_temp, rcx_recv); // rarg2_required might be RCX
1292 assert_different_registers(rarg2_required, rbx_temp);
1293 __ movptr(rarg2_required, Address(rdx_intf, java_mirror_offset)); // required interface
1294 __ mov( rarg1_actual, rbx_temp); // bad receiver
1295 __ movl( rarg0_code, (int) Bytecodes::_invokeinterface); // who is complaining?
1296 __ jump(ExternalAddress(from_interpreted_entry(_raise_exception)));
1297 }
1298 break;
1300 case _bound_ref_mh:
1301 case _bound_int_mh:
1302 case _bound_long_mh:
1303 case _bound_ref_direct_mh:
1304 case _bound_int_direct_mh:
1305 case _bound_long_direct_mh:
1306 {
1307 const bool direct_to_method = (ek >= _bound_ref_direct_mh);
1308 BasicType arg_type = ek_bound_mh_arg_type(ek);
1309 int arg_slots = type2size[arg_type];
1311 // make room for the new argument:
1312 __ movl(rax_argslot, rcx_bmh_vmargslot);
1313 __ lea(rax_argslot, __ argument_address(rax_argslot));
1315 insert_arg_slots(_masm, arg_slots * stack_move_unit(), rax_argslot, rbx_temp, rdx_temp);
1317 // store bound argument into the new stack slot:
1318 __ load_heap_oop(rbx_temp, rcx_bmh_argument);
1319 if (arg_type == T_OBJECT) {
1320 __ movptr(Address(rax_argslot, 0), rbx_temp);
1321 } else {
1322 Address prim_value_addr(rbx_temp, java_lang_boxing_object::value_offset_in_bytes(arg_type));
1323 move_typed_arg(_masm, arg_type, false,
1324 Address(rax_argslot, 0),
1325 prim_value_addr,
1326 rbx_temp, rdx_temp);
1327 }
1329 if (direct_to_method) {
1330 Register rbx_method = rbx_temp;
1331 __ load_heap_oop(rbx_method, rcx_mh_vmtarget);
1332 __ verify_oop(rbx_method);
1333 __ jmp(rbx_method_fie);
1334 } else {
1335 __ load_heap_oop(rcx_recv, rcx_mh_vmtarget);
1336 __ verify_oop(rcx_recv);
1337 __ jump_to_method_handle_entry(rcx_recv, rdx_temp);
1338 }
1339 }
1340 break;
1342 case _adapter_retype_only:
1343 case _adapter_retype_raw:
1344 // immediately jump to the next MH layer:
1345 __ load_heap_oop(rcx_recv, rcx_mh_vmtarget);
1346 __ verify_oop(rcx_recv);
1347 __ jump_to_method_handle_entry(rcx_recv, rdx_temp);
1348 // This is OK when all parameter types widen.
1349 // It is also OK when a return type narrows.
1350 break;
1352 case _adapter_check_cast:
1353 {
1354 // temps:
1355 Register rbx_klass = rbx_temp; // interesting AMH data
1357 // check a reference argument before jumping to the next layer of MH:
1358 __ movl(rax_argslot, rcx_amh_vmargslot);
1359 vmarg = __ argument_address(rax_argslot);
1361 // What class are we casting to?
1362 __ load_heap_oop(rbx_klass, rcx_amh_argument); // this is a Class object!
1363 load_klass_from_Class(_masm, rbx_klass);
1365 Label done;
1366 __ movptr(rdx_temp, vmarg);
1367 __ testptr(rdx_temp, rdx_temp);
1368 __ jcc(Assembler::zero, done); // no cast if null
1369 __ load_klass(rdx_temp, rdx_temp);
1371 // live at this point:
1372 // - rbx_klass: klass required by the target method
1373 // - rdx_temp: argument klass to test
1374 // - rcx_recv: adapter method handle
1375 __ check_klass_subtype(rdx_temp, rbx_klass, rax_argslot, done);
1377 // If we get here, the type check failed!
1378 // Call the wrong_method_type stub, passing the failing argument type in rax.
1379 Register rax_mtype = rax_argslot;
1380 __ movl(rax_argslot, rcx_amh_vmargslot); // reload argslot field
1381 __ movptr(rdx_temp, vmarg);
1383 assert_different_registers(rarg2_required, rdx_temp);
1384 __ load_heap_oop(rarg2_required, rcx_amh_argument); // required class
1385 __ mov( rarg1_actual, rdx_temp); // bad object
1386 __ movl( rarg0_code, (int) Bytecodes::_checkcast); // who is complaining?
1387 __ jump(ExternalAddress(from_interpreted_entry(_raise_exception)));
1389 __ bind(done);
1390 // get the new MH:
1391 __ load_heap_oop(rcx_recv, rcx_mh_vmtarget);
1392 __ jump_to_method_handle_entry(rcx_recv, rdx_temp);
1393 }
1394 break;
1396 case _adapter_prim_to_prim:
1397 case _adapter_ref_to_prim:
1398 case _adapter_prim_to_ref:
1399 // handled completely by optimized cases
1400 __ stop("init_AdapterMethodHandle should not issue this");
1401 break;
1403 case _adapter_opt_i2i: // optimized subcase of adapt_prim_to_prim
1404 //case _adapter_opt_f2i: // optimized subcase of adapt_prim_to_prim
1405 case _adapter_opt_l2i: // optimized subcase of adapt_prim_to_prim
1406 case _adapter_opt_unboxi: // optimized subcase of adapt_ref_to_prim
1407 {
1408 // perform an in-place conversion to int or an int subword
1409 __ movl(rax_argslot, rcx_amh_vmargslot);
1410 vmarg = __ argument_address(rax_argslot);
1412 switch (ek) {
1413 case _adapter_opt_i2i:
1414 __ movl(rdx_temp, vmarg);
1415 break;
1416 case _adapter_opt_l2i:
1417 {
1418 // just delete the extra slot; on a little-endian machine we keep the first
1419 __ lea(rax_argslot, __ argument_address(rax_argslot, 1));
1420 remove_arg_slots(_masm, -stack_move_unit(),
1421 rax_argslot, rbx_temp, rdx_temp);
1422 vmarg = Address(rax_argslot, -Interpreter::stackElementSize);
1423 __ movl(rdx_temp, vmarg);
1424 }
1425 break;
1426 case _adapter_opt_unboxi:
1427 {
1428 // Load the value up from the heap.
1429 __ movptr(rdx_temp, vmarg);
1430 int value_offset = java_lang_boxing_object::value_offset_in_bytes(T_INT);
1431 #ifdef ASSERT
1432 for (int bt = T_BOOLEAN; bt < T_INT; bt++) {
1433 if (is_subword_type(BasicType(bt)))
1434 assert(value_offset == java_lang_boxing_object::value_offset_in_bytes(BasicType(bt)), "");
1435 }
1436 #endif
1437 __ null_check(rdx_temp, value_offset);
1438 __ movl(rdx_temp, Address(rdx_temp, value_offset));
1439 // We load this as a word. Because we are little-endian,
1440 // the low bits will be correct, but the high bits may need cleaning.
1441 // The vminfo will guide us to clean those bits.
1442 }
1443 break;
1444 default:
1445 ShouldNotReachHere();
1446 }
1448 // Do the requested conversion and store the value.
1449 Register rbx_vminfo = rbx_temp;
1450 load_conversion_vminfo(_masm, rbx_vminfo, rcx_amh_conversion);
1452 // get the new MH:
1453 __ load_heap_oop(rcx_recv, rcx_mh_vmtarget);
1454 // (now we are done with the old MH)
1456 // original 32-bit vmdata word must be of this form:
1457 // | MBZ:6 | signBitCount:8 | srcDstTypes:8 | conversionOp:8 |
1458 __ xchgptr(rcx, rbx_vminfo); // free rcx for shifts
1459 __ shll(rdx_temp /*, rcx*/);
1460 Label zero_extend, done;
1461 __ testl(rcx, CONV_VMINFO_SIGN_FLAG);
1462 __ jccb(Assembler::zero, zero_extend);
1464 // this path is taken for int->byte, int->short
1465 __ sarl(rdx_temp /*, rcx*/);
1466 __ jmpb(done);
1468 __ bind(zero_extend);
1469 // this is taken for int->char
1470 __ shrl(rdx_temp /*, rcx*/);
1472 __ bind(done);
1473 __ movl(vmarg, rdx_temp); // Store the value.
1474 __ xchgptr(rcx, rbx_vminfo); // restore rcx_recv
1476 __ jump_to_method_handle_entry(rcx_recv, rdx_temp);
1477 }
1478 break;
1480 case _adapter_opt_i2l: // optimized subcase of adapt_prim_to_prim
1481 case _adapter_opt_unboxl: // optimized subcase of adapt_ref_to_prim
1482 {
1483 // perform an in-place int-to-long or ref-to-long conversion
1484 __ movl(rax_argslot, rcx_amh_vmargslot);
1486 // on a little-endian machine we keep the first slot and add another after
1487 __ lea(rax_argslot, __ argument_address(rax_argslot, 1));
1488 insert_arg_slots(_masm, stack_move_unit(),
1489 rax_argslot, rbx_temp, rdx_temp);
1490 Address vmarg1(rax_argslot, -Interpreter::stackElementSize);
1491 Address vmarg2 = vmarg1.plus_disp(Interpreter::stackElementSize);
1493 switch (ek) {
1494 case _adapter_opt_i2l:
1495 {
1496 #ifdef _LP64
1497 __ movslq(rdx_temp, vmarg1); // Load sign-extended
1498 __ movq(vmarg1, rdx_temp); // Store into first slot
1499 #else
1500 __ movl(rdx_temp, vmarg1);
1501 __ sarl(rdx_temp, BitsPerInt - 1); // __ extend_sign()
1502 __ movl(vmarg2, rdx_temp); // store second word
1503 #endif
1504 }
1505 break;
1506 case _adapter_opt_unboxl:
1507 {
1508 // Load the value up from the heap.
1509 __ movptr(rdx_temp, vmarg1);
1510 int value_offset = java_lang_boxing_object::value_offset_in_bytes(T_LONG);
1511 assert(value_offset == java_lang_boxing_object::value_offset_in_bytes(T_DOUBLE), "");
1512 __ null_check(rdx_temp, value_offset);
1513 #ifdef _LP64
1514 __ movq(rbx_temp, Address(rdx_temp, value_offset));
1515 __ movq(vmarg1, rbx_temp);
1516 #else
1517 __ movl(rbx_temp, Address(rdx_temp, value_offset + 0*BytesPerInt));
1518 __ movl(rdx_temp, Address(rdx_temp, value_offset + 1*BytesPerInt));
1519 __ movl(vmarg1, rbx_temp);
1520 __ movl(vmarg2, rdx_temp);
1521 #endif
1522 }
1523 break;
1524 default:
1525 ShouldNotReachHere();
1526 }
1528 __ load_heap_oop(rcx_recv, rcx_mh_vmtarget);
1529 __ jump_to_method_handle_entry(rcx_recv, rdx_temp);
1530 }
1531 break;
1533 case _adapter_opt_f2d: // optimized subcase of adapt_prim_to_prim
1534 case _adapter_opt_d2f: // optimized subcase of adapt_prim_to_prim
1535 {
1536 // perform an in-place floating primitive conversion
1537 __ movl(rax_argslot, rcx_amh_vmargslot);
1538 __ lea(rax_argslot, __ argument_address(rax_argslot, 1));
1539 if (ek == _adapter_opt_f2d) {
1540 insert_arg_slots(_masm, stack_move_unit(),
1541 rax_argslot, rbx_temp, rdx_temp);
1542 }
1543 Address vmarg(rax_argslot, -Interpreter::stackElementSize);
1545 #ifdef _LP64
1546 if (ek == _adapter_opt_f2d) {
1547 __ movflt(xmm0, vmarg);
1548 __ cvtss2sd(xmm0, xmm0);
1549 __ movdbl(vmarg, xmm0);
1550 } else {
1551 __ movdbl(xmm0, vmarg);
1552 __ cvtsd2ss(xmm0, xmm0);
1553 __ movflt(vmarg, xmm0);
1554 }
1555 #else //_LP64
1556 if (ek == _adapter_opt_f2d) {
1557 __ fld_s(vmarg); // load float to ST0
1558 __ fstp_d(vmarg); // store double
1559 } else {
1560 __ fld_d(vmarg); // load double to ST0
1561 __ fstp_s(vmarg); // store single
1562 }
1563 #endif //_LP64
1565 if (ek == _adapter_opt_d2f) {
1566 remove_arg_slots(_masm, -stack_move_unit(),
1567 rax_argslot, rbx_temp, rdx_temp);
1568 }
1570 __ load_heap_oop(rcx_recv, rcx_mh_vmtarget);
1571 __ jump_to_method_handle_entry(rcx_recv, rdx_temp);
1572 }
1573 break;
1575 case _adapter_swap_args:
1576 case _adapter_rot_args:
1577 // handled completely by optimized cases
1578 __ stop("init_AdapterMethodHandle should not issue this");
1579 break;
1581 case _adapter_opt_swap_1:
1582 case _adapter_opt_swap_2:
1583 case _adapter_opt_rot_1_up:
1584 case _adapter_opt_rot_1_down:
1585 case _adapter_opt_rot_2_up:
1586 case _adapter_opt_rot_2_down:
1587 {
1588 int swap_slots = ek_adapter_opt_swap_slots(ek);
1589 int rotate = ek_adapter_opt_swap_mode(ek);
1591 // 'argslot' is the position of the first argument to swap
1592 __ movl(rax_argslot, rcx_amh_vmargslot);
1593 __ lea(rax_argslot, __ argument_address(rax_argslot));
1595 // 'vminfo' is the second
1596 Register rbx_destslot = rbx_temp;
1597 load_conversion_vminfo(_masm, rbx_destslot, rcx_amh_conversion);
1598 __ lea(rbx_destslot, __ argument_address(rbx_destslot));
1599 if (VerifyMethodHandles)
1600 verify_argslot(_masm, rbx_destslot, "swap point must fall within current frame");
1602 assert(Interpreter::stackElementSize == wordSize, "else rethink use of wordSize here");
1603 if (!rotate) {
1604 // simple swap
1605 for (int i = 0; i < swap_slots; i++) {
1606 __ movptr(rdi_temp, Address(rax_argslot, i * wordSize));
1607 __ movptr(rdx_temp, Address(rbx_destslot, i * wordSize));
1608 __ movptr(Address(rax_argslot, i * wordSize), rdx_temp);
1609 __ movptr(Address(rbx_destslot, i * wordSize), rdi_temp);
1610 }
1611 } else {
1612 // A rotate is actually pair of moves, with an "odd slot" (or pair)
1613 // changing place with a series of other slots.
1614 // First, push the "odd slot", which is going to get overwritten
1615 for (int i = swap_slots - 1; i >= 0; i--) {
1616 // handle one with rdi_temp instead of a push:
1617 if (i == 0) __ movptr(rdi_temp, Address(rax_argslot, i * wordSize));
1618 else __ pushptr( Address(rax_argslot, i * wordSize));
1619 }
1620 if (rotate > 0) {
1621 // Here is rotate > 0:
1622 // (low mem) (high mem)
1623 // | dest: more_slots... | arg: odd_slot :arg+1 |
1624 // =>
1625 // | dest: odd_slot | dest+1: more_slots... :arg+1 |
1626 // work argslot down to destslot, copying contiguous data upwards
1627 // pseudo-code:
1628 // rax = src_addr - swap_bytes
1629 // rbx = dest_addr
1630 // while (rax >= rbx) *(rax + swap_bytes) = *(rax + 0), rax--;
1631 move_arg_slots_up(_masm,
1632 rbx_destslot,
1633 Address(rax_argslot, 0),
1634 swap_slots,
1635 rax_argslot, rdx_temp);
1636 } else {
1637 // Here is the other direction, rotate < 0:
1638 // (low mem) (high mem)
1639 // | arg: odd_slot | arg+1: more_slots... :dest+1 |
1640 // =>
1641 // | arg: more_slots... | dest: odd_slot :dest+1 |
1642 // work argslot up to destslot, copying contiguous data downwards
1643 // pseudo-code:
1644 // rax = src_addr + swap_bytes
1645 // rbx = dest_addr
1646 // while (rax <= rbx) *(rax - swap_bytes) = *(rax + 0), rax++;
1647 // dest_slot denotes an exclusive upper limit
1648 int limit_bias = OP_ROT_ARGS_DOWN_LIMIT_BIAS;
1649 if (limit_bias != 0)
1650 __ addptr(rbx_destslot, - limit_bias * wordSize);
1651 move_arg_slots_down(_masm,
1652 Address(rax_argslot, swap_slots * wordSize),
1653 rbx_destslot,
1654 -swap_slots,
1655 rax_argslot, rdx_temp);
1656 __ subptr(rbx_destslot, swap_slots * wordSize);
1657 }
1658 // pop the original first chunk into the destination slot, now free
1659 for (int i = 0; i < swap_slots; i++) {
1660 if (i == 0) __ movptr(Address(rbx_destslot, i * wordSize), rdi_temp);
1661 else __ popptr(Address(rbx_destslot, i * wordSize));
1662 }
1663 }
1665 __ load_heap_oop(rcx_recv, rcx_mh_vmtarget);
1666 __ jump_to_method_handle_entry(rcx_recv, rdx_temp);
1667 }
1668 break;
1670 case _adapter_dup_args:
1671 {
1672 // 'argslot' is the position of the first argument to duplicate
1673 __ movl(rax_argslot, rcx_amh_vmargslot);
1674 __ lea(rax_argslot, __ argument_address(rax_argslot));
1676 // 'stack_move' is negative number of words to duplicate
1677 Register rdi_stack_move = rdi_temp;
1678 load_stack_move(_masm, rdi_stack_move, rcx_recv, true);
1680 if (VerifyMethodHandles) {
1681 verify_argslots(_masm, rdi_stack_move, rax_argslot, true,
1682 "copied argument(s) must fall within current frame");
1683 }
1685 // insert location is always the bottom of the argument list:
1686 Address insert_location = __ argument_address(constant(0));
1687 int pre_arg_words = insert_location.disp() / wordSize; // return PC is pushed
1688 assert(insert_location.base() == rsp, "");
1690 __ negl(rdi_stack_move);
1691 push_arg_slots(_masm, rax_argslot, rdi_stack_move,
1692 pre_arg_words, rbx_temp, rdx_temp);
1694 __ load_heap_oop(rcx_recv, rcx_mh_vmtarget);
1695 __ jump_to_method_handle_entry(rcx_recv, rdx_temp);
1696 }
1697 break;
1699 case _adapter_drop_args:
1700 {
1701 // 'argslot' is the position of the first argument to nuke
1702 __ movl(rax_argslot, rcx_amh_vmargslot);
1703 __ lea(rax_argslot, __ argument_address(rax_argslot));
1705 // (must do previous push after argslot address is taken)
1707 // 'stack_move' is number of words to drop
1708 Register rdi_stack_move = rdi_temp;
1709 load_stack_move(_masm, rdi_stack_move, rcx_recv, false);
1710 remove_arg_slots(_masm, rdi_stack_move,
1711 rax_argslot, rbx_temp, rdx_temp);
1713 __ load_heap_oop(rcx_recv, rcx_mh_vmtarget);
1714 __ jump_to_method_handle_entry(rcx_recv, rdx_temp);
1715 }
1716 break;
1718 case _adapter_collect_args:
1719 case _adapter_fold_args:
1720 case _adapter_spread_args:
1721 // handled completely by optimized cases
1722 __ stop("init_AdapterMethodHandle should not issue this");
1723 break;
1725 case _adapter_opt_collect_ref:
1726 case _adapter_opt_collect_int:
1727 case _adapter_opt_collect_long:
1728 case _adapter_opt_collect_float:
1729 case _adapter_opt_collect_double:
1730 case _adapter_opt_collect_void:
1731 case _adapter_opt_collect_0_ref:
1732 case _adapter_opt_collect_1_ref:
1733 case _adapter_opt_collect_2_ref:
1734 case _adapter_opt_collect_3_ref:
1735 case _adapter_opt_collect_4_ref:
1736 case _adapter_opt_collect_5_ref:
1737 case _adapter_opt_filter_S0_ref:
1738 case _adapter_opt_filter_S1_ref:
1739 case _adapter_opt_filter_S2_ref:
1740 case _adapter_opt_filter_S3_ref:
1741 case _adapter_opt_filter_S4_ref:
1742 case _adapter_opt_filter_S5_ref:
1743 case _adapter_opt_collect_2_S0_ref:
1744 case _adapter_opt_collect_2_S1_ref:
1745 case _adapter_opt_collect_2_S2_ref:
1746 case _adapter_opt_collect_2_S3_ref:
1747 case _adapter_opt_collect_2_S4_ref:
1748 case _adapter_opt_collect_2_S5_ref:
1749 case _adapter_opt_fold_ref:
1750 case _adapter_opt_fold_int:
1751 case _adapter_opt_fold_long:
1752 case _adapter_opt_fold_float:
1753 case _adapter_opt_fold_double:
1754 case _adapter_opt_fold_void:
1755 case _adapter_opt_fold_1_ref:
1756 case _adapter_opt_fold_2_ref:
1757 case _adapter_opt_fold_3_ref:
1758 case _adapter_opt_fold_4_ref:
1759 case _adapter_opt_fold_5_ref:
1760 {
1761 // Given a fresh incoming stack frame, build a new ricochet frame.
1762 // On entry, TOS points at a return PC, and RBP is the callers frame ptr.
1763 // RSI/R13 has the caller's exact stack pointer, which we must also preserve.
1764 // RCX contains an AdapterMethodHandle of the indicated kind.
1766 // Relevant AMH fields:
1767 // amh.vmargslot:
1768 // points to the trailing edge of the arguments
1769 // to filter, collect, or fold. For a boxing operation,
1770 // it points just after the single primitive value.
1771 // amh.argument:
1772 // recursively called MH, on |collect| arguments
1773 // amh.vmtarget:
1774 // final destination MH, on return value, etc.
1775 // amh.conversion.dest:
1776 // tells what is the type of the return value
1777 // (not needed here, since dest is also derived from ek)
1778 // amh.conversion.vminfo:
1779 // points to the trailing edge of the return value
1780 // when the vmtarget is to be called; this is
1781 // equal to vmargslot + (retained ? |collect| : 0)
1783 // Pass 0 or more argument slots to the recursive target.
1784 int collect_count_constant = ek_adapter_opt_collect_count(ek);
1786 // The collected arguments are copied from the saved argument list:
1787 int collect_slot_constant = ek_adapter_opt_collect_slot(ek);
1789 assert(ek_orig == _adapter_collect_args ||
1790 ek_orig == _adapter_fold_args, "");
1791 bool retain_original_args = (ek_orig == _adapter_fold_args);
1793 // The return value is replaced (or inserted) at the 'vminfo' argslot.
1794 // Sometimes we can compute this statically.
1795 int dest_slot_constant = -1;
1796 if (!retain_original_args)
1797 dest_slot_constant = collect_slot_constant;
1798 else if (collect_slot_constant >= 0 && collect_count_constant >= 0)
1799 // We are preserving all the arguments, and the return value is prepended,
1800 // so the return slot is to the left (above) the |collect| sequence.
1801 dest_slot_constant = collect_slot_constant + collect_count_constant;
1803 // Replace all those slots by the result of the recursive call.
1804 // The result type can be one of ref, int, long, float, double, void.
1805 // In the case of void, nothing is pushed on the stack after return.
1806 BasicType dest = ek_adapter_opt_collect_type(ek);
1807 assert(dest == type2wfield[dest], "dest is a stack slot type");
1808 int dest_count = type2size[dest];
1809 assert(dest_count == 1 || dest_count == 2 || (dest_count == 0 && dest == T_VOID), "dest has a size");
1811 // Choose a return continuation.
1812 EntryKind ek_ret = _adapter_opt_return_any;
1813 if (dest != T_CONFLICT && OptimizeMethodHandles) {
1814 switch (dest) {
1815 case T_INT : ek_ret = _adapter_opt_return_int; break;
1816 case T_LONG : ek_ret = _adapter_opt_return_long; break;
1817 case T_FLOAT : ek_ret = _adapter_opt_return_float; break;
1818 case T_DOUBLE : ek_ret = _adapter_opt_return_double; break;
1819 case T_OBJECT : ek_ret = _adapter_opt_return_ref; break;
1820 case T_VOID : ek_ret = _adapter_opt_return_void; break;
1821 default : ShouldNotReachHere();
1822 }
1823 if (dest == T_OBJECT && dest_slot_constant >= 0) {
1824 EntryKind ek_try = EntryKind(_adapter_opt_return_S0_ref + dest_slot_constant);
1825 if (ek_try <= _adapter_opt_return_LAST &&
1826 ek_adapter_opt_return_slot(ek_try) == dest_slot_constant) {
1827 ek_ret = ek_try;
1828 }
1829 }
1830 assert(ek_adapter_opt_return_type(ek_ret) == dest, "");
1831 }
1833 // Already pushed: ... keep1 | collect | keep2 | sender_pc |
1834 // push(sender_pc);
1836 // Compute argument base:
1837 Register rax_argv = rax_argslot;
1838 __ lea(rax_argv, __ argument_address(constant(0)));
1840 // Push a few extra argument words, if we need them to store the return value.
1841 {
1842 int extra_slots = 0;
1843 if (retain_original_args) {
1844 extra_slots = dest_count;
1845 } else if (collect_count_constant == -1) {
1846 extra_slots = dest_count; // collect_count might be zero; be generous
1847 } else if (dest_count > collect_count_constant) {
1848 extra_slots = (dest_count - collect_count_constant);
1849 } else {
1850 // else we know we have enough dead space in |collect| to repurpose for return values
1851 }
1852 DEBUG_ONLY(extra_slots += 1);
1853 if (extra_slots > 0) {
1854 __ pop(rbx_temp); // return value
1855 __ subptr(rsp, (extra_slots * Interpreter::stackElementSize));
1856 // Push guard word #2 in debug mode.
1857 DEBUG_ONLY(__ movptr(Address(rsp, 0), (int32_t) RicochetFrame::MAGIC_NUMBER_2));
1858 __ push(rbx_temp);
1859 }
1860 }
1862 RicochetFrame::enter_ricochet_frame(_masm, rcx_recv, rax_argv,
1863 entry(ek_ret)->from_interpreted_entry(), rbx_temp);
1865 // Now pushed: ... keep1 | collect | keep2 | RF |
1866 // some handy frame slots:
1867 Address exact_sender_sp_addr = RicochetFrame::frame_address(RicochetFrame::exact_sender_sp_offset_in_bytes());
1868 Address conversion_addr = RicochetFrame::frame_address(RicochetFrame::conversion_offset_in_bytes());
1869 Address saved_args_base_addr = RicochetFrame::frame_address(RicochetFrame::saved_args_base_offset_in_bytes());
1871 #ifdef ASSERT
1872 if (VerifyMethodHandles && dest != T_CONFLICT) {
1873 BLOCK_COMMENT("verify AMH.conv.dest");
1874 load_conversion_dest_type(_masm, rbx_temp, conversion_addr);
1875 Label L_dest_ok;
1876 __ cmpl(rbx_temp, (int) dest);
1877 __ jcc(Assembler::equal, L_dest_ok);
1878 if (dest == T_INT) {
1879 for (int bt = T_BOOLEAN; bt < T_INT; bt++) {
1880 if (is_subword_type(BasicType(bt))) {
1881 __ cmpl(rbx_temp, (int) bt);
1882 __ jcc(Assembler::equal, L_dest_ok);
1883 }
1884 }
1885 }
1886 __ stop("bad dest in AMH.conv");
1887 __ BIND(L_dest_ok);
1888 }
1889 #endif //ASSERT
1891 // Find out where the original copy of the recursive argument sequence begins.
1892 Register rax_coll = rax_argv;
1893 {
1894 RegisterOrConstant collect_slot = collect_slot_constant;
1895 if (collect_slot_constant == -1) {
1896 __ movl(rdi_temp, rcx_amh_vmargslot);
1897 collect_slot = rdi_temp;
1898 }
1899 if (collect_slot_constant != 0)
1900 __ lea(rax_coll, Address(rax_argv, collect_slot, Interpreter::stackElementScale()));
1901 // rax_coll now points at the trailing edge of |collect| and leading edge of |keep2|
1902 }
1904 // Replace the old AMH with the recursive MH. (No going back now.)
1905 // In the case of a boxing call, the recursive call is to a 'boxer' method,
1906 // such as Integer.valueOf or Long.valueOf. In the case of a filter
1907 // or collect call, it will take one or more arguments, transform them,
1908 // and return some result, to store back into argument_base[vminfo].
1909 __ load_heap_oop(rcx_recv, rcx_amh_argument);
1910 if (VerifyMethodHandles) verify_method_handle(_masm, rcx_recv);
1912 // Push a space for the recursively called MH first:
1913 __ push((int32_t)NULL_WORD);
1915 // Calculate |collect|, the number of arguments we are collecting.
1916 Register rdi_collect_count = rdi_temp;
1917 RegisterOrConstant collect_count;
1918 if (collect_count_constant >= 0) {
1919 collect_count = collect_count_constant;
1920 } else {
1921 __ load_method_handle_vmslots(rdi_collect_count, rcx_recv, rdx_temp);
1922 collect_count = rdi_collect_count;
1923 }
1924 #ifdef ASSERT
1925 if (VerifyMethodHandles && collect_count_constant >= 0) {
1926 __ load_method_handle_vmslots(rbx_temp, rcx_recv, rdx_temp);
1927 Label L_count_ok;
1928 __ cmpl(rbx_temp, collect_count_constant);
1929 __ jcc(Assembler::equal, L_count_ok);
1930 __ stop("bad vminfo in AMH.conv");
1931 __ BIND(L_count_ok);
1932 }
1933 #endif //ASSERT
1935 // copy |collect| slots directly to TOS:
1936 push_arg_slots(_masm, rax_coll, collect_count, 0, rbx_temp, rdx_temp);
1937 // Now pushed: ... keep1 | collect | keep2 | RF... | collect |
1938 // rax_coll still points at the trailing edge of |collect| and leading edge of |keep2|
1940 // If necessary, adjust the saved arguments to make room for the eventual return value.
1941 // Normal adjustment: ... keep1 | +dest+ | -collect- | keep2 | RF... | collect |
1942 // If retaining args: ... keep1 | +dest+ | collect | keep2 | RF... | collect |
1943 // In the non-retaining case, this might move keep2 either up or down.
1944 // We don't have to copy the whole | RF... collect | complex,
1945 // but we must adjust RF.saved_args_base.
1946 // Also, from now on, we will forget about the original copy of |collect|.
1947 // If we are retaining it, we will treat it as part of |keep2|.
1948 // For clarity we will define |keep3| = |collect|keep2| or |keep2|.
1950 BLOCK_COMMENT("adjust trailing arguments {");
1951 // Compare the sizes of |+dest+| and |-collect-|, which are opposed opening and closing movements.
1952 int open_count = dest_count;
1953 RegisterOrConstant close_count = collect_count_constant;
1954 Register rdi_close_count = rdi_collect_count;
1955 if (retain_original_args) {
1956 close_count = constant(0);
1957 } else if (collect_count_constant == -1) {
1958 close_count = rdi_collect_count;
1959 }
1961 // How many slots need moving? This is simply dest_slot (0 => no |keep3|).
1962 RegisterOrConstant keep3_count;
1963 Register rsi_keep3_count = rsi; // can repair from RF.exact_sender_sp
1964 if (dest_slot_constant >= 0) {
1965 keep3_count = dest_slot_constant;
1966 } else {
1967 load_conversion_vminfo(_masm, rsi_keep3_count, conversion_addr);
1968 keep3_count = rsi_keep3_count;
1969 }
1970 #ifdef ASSERT
1971 if (VerifyMethodHandles && dest_slot_constant >= 0) {
1972 load_conversion_vminfo(_masm, rbx_temp, conversion_addr);
1973 Label L_vminfo_ok;
1974 __ cmpl(rbx_temp, dest_slot_constant);
1975 __ jcc(Assembler::equal, L_vminfo_ok);
1976 __ stop("bad vminfo in AMH.conv");
1977 __ BIND(L_vminfo_ok);
1978 }
1979 #endif //ASSERT
1981 // tasks remaining:
1982 bool move_keep3 = (!keep3_count.is_constant() || keep3_count.as_constant() != 0);
1983 bool stomp_dest = (NOT_DEBUG(dest == T_OBJECT) DEBUG_ONLY(dest_count != 0));
1984 bool fix_arg_base = (!close_count.is_constant() || open_count != close_count.as_constant());
1986 if (stomp_dest | fix_arg_base) {
1987 // we will probably need an updated rax_argv value
1988 if (collect_slot_constant >= 0) {
1989 // rax_coll already holds the leading edge of |keep2|, so tweak it
1990 assert(rax_coll == rax_argv, "elided a move");
1991 if (collect_slot_constant != 0)
1992 __ subptr(rax_argv, collect_slot_constant * Interpreter::stackElementSize);
1993 } else {
1994 // Just reload from RF.saved_args_base.
1995 __ movptr(rax_argv, saved_args_base_addr);
1996 }
1997 }
1999 // Old and new argument locations (based at slot 0).
2000 // Net shift (&new_argv - &old_argv) is (close_count - open_count).
2001 bool zero_open_count = (open_count == 0); // remember this bit of info
2002 if (move_keep3 && fix_arg_base) {
2003 // It will be easier to have everything in one register:
2004 if (close_count.is_register()) {
2005 // Deduct open_count from close_count register to get a clean +/- value.
2006 __ subptr(close_count.as_register(), open_count);
2007 } else {
2008 close_count = close_count.as_constant() - open_count;
2009 }
2010 open_count = 0;
2011 }
2012 Address old_argv(rax_argv, 0);
2013 Address new_argv(rax_argv, close_count, Interpreter::stackElementScale(),
2014 - open_count * Interpreter::stackElementSize);
2016 // First decide if any actual data are to be moved.
2017 // We can skip if (a) |keep3| is empty, or (b) the argument list size didn't change.
2018 // (As it happens, all movements involve an argument list size change.)
2020 // If there are variable parameters, use dynamic checks to skip around the whole mess.
2021 Label L_done;
2022 if (!keep3_count.is_constant()) {
2023 __ testl(keep3_count.as_register(), keep3_count.as_register());
2024 __ jcc(Assembler::zero, L_done);
2025 }
2026 if (!close_count.is_constant()) {
2027 __ cmpl(close_count.as_register(), open_count);
2028 __ jcc(Assembler::equal, L_done);
2029 }
2031 if (move_keep3 && fix_arg_base) {
2032 bool emit_move_down = false, emit_move_up = false, emit_guard = false;
2033 if (!close_count.is_constant()) {
2034 emit_move_down = emit_guard = !zero_open_count;
2035 emit_move_up = true;
2036 } else if (open_count != close_count.as_constant()) {
2037 emit_move_down = (open_count > close_count.as_constant());
2038 emit_move_up = !emit_move_down;
2039 }
2040 Label L_move_up;
2041 if (emit_guard) {
2042 __ cmpl(close_count.as_register(), open_count);
2043 __ jcc(Assembler::greater, L_move_up);
2044 }
2046 if (emit_move_down) {
2047 // Move arguments down if |+dest+| > |-collect-|
2048 // (This is rare, except when arguments are retained.)
2049 // This opens space for the return value.
2050 if (keep3_count.is_constant()) {
2051 for (int i = 0; i < keep3_count.as_constant(); i++) {
2052 __ movptr(rdx_temp, old_argv.plus_disp(i * Interpreter::stackElementSize));
2053 __ movptr( new_argv.plus_disp(i * Interpreter::stackElementSize), rdx_temp);
2054 }
2055 } else {
2056 Register rbx_argv_top = rbx_temp;
2057 __ lea(rbx_argv_top, old_argv.plus_disp(keep3_count, Interpreter::stackElementScale()));
2058 move_arg_slots_down(_masm,
2059 old_argv, // beginning of old argv
2060 rbx_argv_top, // end of old argv
2061 close_count, // distance to move down (must be negative)
2062 rax_argv, rdx_temp);
2063 // Used argv as an iteration variable; reload from RF.saved_args_base.
2064 __ movptr(rax_argv, saved_args_base_addr);
2065 }
2066 }
2068 if (emit_guard) {
2069 __ jmp(L_done); // assumes emit_move_up is true also
2070 __ BIND(L_move_up);
2071 }
2073 if (emit_move_up) {
2075 // Move arguments up if |+dest+| < |-collect-|
2076 // (This is usual, except when |keep3| is empty.)
2077 // This closes up the space occupied by the now-deleted collect values.
2078 if (keep3_count.is_constant()) {
2079 for (int i = keep3_count.as_constant() - 1; i >= 0; i--) {
2080 __ movptr(rdx_temp, old_argv.plus_disp(i * Interpreter::stackElementSize));
2081 __ movptr( new_argv.plus_disp(i * Interpreter::stackElementSize), rdx_temp);
2082 }
2083 } else {
2084 Address argv_top = old_argv.plus_disp(keep3_count, Interpreter::stackElementScale());
2085 move_arg_slots_up(_masm,
2086 rax_argv, // beginning of old argv
2087 argv_top, // end of old argv
2088 close_count, // distance to move up (must be positive)
2089 rbx_temp, rdx_temp);
2090 }
2091 }
2092 }
2093 __ BIND(L_done);
2095 if (fix_arg_base) {
2096 // adjust RF.saved_args_base by adding (close_count - open_count)
2097 if (!new_argv.is_same_address(Address(rax_argv, 0)))
2098 __ lea(rax_argv, new_argv);
2099 __ movptr(saved_args_base_addr, rax_argv);
2100 }
2102 if (stomp_dest) {
2103 // Stomp the return slot, so it doesn't hold garbage.
2104 // This isn't strictly necessary, but it may help detect bugs.
2105 int forty_two = RicochetFrame::RETURN_VALUE_PLACEHOLDER;
2106 __ movptr(Address(rax_argv, keep3_count, Address::times_ptr),
2107 (int32_t) forty_two);
2108 // uses rsi_keep3_count
2109 }
2110 BLOCK_COMMENT("} adjust trailing arguments");
2112 BLOCK_COMMENT("do_recursive_call");
2113 __ mov(saved_last_sp, rsp); // set rsi/r13 for callee
2114 __ pushptr(ExternalAddress(SharedRuntime::ricochet_blob()->bounce_addr()).addr());
2115 // The globally unique bounce address has two purposes:
2116 // 1. It helps the JVM recognize this frame (frame::is_ricochet_frame).
2117 // 2. When returned to, it cuts back the stack and redirects control flow
2118 // to the return handler.
2119 // The return handler will further cut back the stack when it takes
2120 // down the RF. Perhaps there is a way to streamline this further.
2122 // State during recursive call:
2123 // ... keep1 | dest | dest=42 | keep3 | RF... | collect | bounce_pc |
2124 __ jump_to_method_handle_entry(rcx_recv, rdx_temp);
2126 break;
2127 }
2129 case _adapter_opt_return_ref:
2130 case _adapter_opt_return_int:
2131 case _adapter_opt_return_long:
2132 case _adapter_opt_return_float:
2133 case _adapter_opt_return_double:
2134 case _adapter_opt_return_void:
2135 case _adapter_opt_return_S0_ref:
2136 case _adapter_opt_return_S1_ref:
2137 case _adapter_opt_return_S2_ref:
2138 case _adapter_opt_return_S3_ref:
2139 case _adapter_opt_return_S4_ref:
2140 case _adapter_opt_return_S5_ref:
2141 {
2142 BasicType dest_type_constant = ek_adapter_opt_return_type(ek);
2143 int dest_slot_constant = ek_adapter_opt_return_slot(ek);
2145 if (VerifyMethodHandles) RicochetFrame::verify_clean(_masm);
2147 if (dest_slot_constant == -1) {
2148 // The current stub is a general handler for this dest_type.
2149 // It can be called from _adapter_opt_return_any below.
2150 // Stash the address in a little table.
2151 assert((dest_type_constant & CONV_TYPE_MASK) == dest_type_constant, "oob");
2152 address return_handler = __ pc();
2153 _adapter_return_handlers[dest_type_constant] = return_handler;
2154 if (dest_type_constant == T_INT) {
2155 // do the subword types too
2156 for (int bt = T_BOOLEAN; bt < T_INT; bt++) {
2157 if (is_subword_type(BasicType(bt)) &&
2158 _adapter_return_handlers[bt] == NULL) {
2159 _adapter_return_handlers[bt] = return_handler;
2160 }
2161 }
2162 }
2163 }
2165 Register rbx_arg_base = rbx_temp;
2166 assert_different_registers(rax, rdx, // possibly live return value registers
2167 rdi_temp, rbx_arg_base);
2169 Address conversion_addr = RicochetFrame::frame_address(RicochetFrame::conversion_offset_in_bytes());
2170 Address saved_args_base_addr = RicochetFrame::frame_address(RicochetFrame::saved_args_base_offset_in_bytes());
2172 __ movptr(rbx_arg_base, saved_args_base_addr);
2173 RegisterOrConstant dest_slot = dest_slot_constant;
2174 if (dest_slot_constant == -1) {
2175 load_conversion_vminfo(_masm, rdi_temp, conversion_addr);
2176 dest_slot = rdi_temp;
2177 }
2178 // Store the result back into the argslot.
2179 // This code uses the interpreter calling sequence, in which the return value
2180 // is usually left in the TOS register, as defined by InterpreterMacroAssembler::pop.
2181 // There are certain irregularities with floating point values, which can be seen
2182 // in TemplateInterpreterGenerator::generate_return_entry_for.
2183 move_return_value(_masm, dest_type_constant, Address(rbx_arg_base, dest_slot, Interpreter::stackElementScale()));
2185 RicochetFrame::leave_ricochet_frame(_masm, rcx_recv, rbx_arg_base, rdx_temp);
2186 __ push(rdx_temp); // repush the return PC
2188 // Load the final target and go.
2189 if (VerifyMethodHandles) verify_method_handle(_masm, rcx_recv);
2190 __ jump_to_method_handle_entry(rcx_recv, rdx_temp);
2191 __ hlt(); // --------------------
2192 break;
2193 }
2195 case _adapter_opt_return_any:
2196 {
2197 if (VerifyMethodHandles) RicochetFrame::verify_clean(_masm);
2198 Register rdi_conv = rdi_temp;
2199 assert_different_registers(rax, rdx, // possibly live return value registers
2200 rdi_conv, rbx_temp);
2202 Address conversion_addr = RicochetFrame::frame_address(RicochetFrame::conversion_offset_in_bytes());
2203 load_conversion_dest_type(_masm, rdi_conv, conversion_addr);
2204 __ lea(rbx_temp, ExternalAddress((address) &_adapter_return_handlers[0]));
2205 __ movptr(rbx_temp, Address(rbx_temp, rdi_conv, Address::times_ptr));
2207 #ifdef ASSERT
2208 { Label L_badconv;
2209 __ testptr(rbx_temp, rbx_temp);
2210 __ jccb(Assembler::zero, L_badconv);
2211 __ jmp(rbx_temp);
2212 __ bind(L_badconv);
2213 __ stop("bad method handle return");
2214 }
2215 #else //ASSERT
2216 __ jmp(rbx_temp);
2217 #endif //ASSERT
2218 break;
2219 }
2221 case _adapter_opt_spread_0:
2222 case _adapter_opt_spread_1_ref:
2223 case _adapter_opt_spread_2_ref:
2224 case _adapter_opt_spread_3_ref:
2225 case _adapter_opt_spread_4_ref:
2226 case _adapter_opt_spread_5_ref:
2227 case _adapter_opt_spread_ref:
2228 case _adapter_opt_spread_byte:
2229 case _adapter_opt_spread_char:
2230 case _adapter_opt_spread_short:
2231 case _adapter_opt_spread_int:
2232 case _adapter_opt_spread_long:
2233 case _adapter_opt_spread_float:
2234 case _adapter_opt_spread_double:
2235 {
2236 // spread an array out into a group of arguments
2237 int length_constant = ek_adapter_opt_spread_count(ek);
2238 bool length_can_be_zero = (length_constant == 0);
2239 if (length_constant < 0) {
2240 // some adapters with variable length must handle the zero case
2241 if (!OptimizeMethodHandles ||
2242 ek_adapter_opt_spread_type(ek) != T_OBJECT)
2243 length_can_be_zero = true;
2244 }
2246 // find the address of the array argument
2247 __ movl(rax_argslot, rcx_amh_vmargslot);
2248 __ lea(rax_argslot, __ argument_address(rax_argslot));
2250 // grab another temp
2251 Register rsi_temp = rsi;
2252 { if (rsi_temp == saved_last_sp) __ push(saved_last_sp); }
2253 // (preceding push must be done after argslot address is taken!)
2254 #define UNPUSH_RSI \
2255 { if (rsi_temp == saved_last_sp) __ pop(saved_last_sp); }
2257 // arx_argslot points both to the array and to the first output arg
2258 vmarg = Address(rax_argslot, 0);
2260 // Get the array value.
2261 Register rsi_array = rsi_temp;
2262 Register rdx_array_klass = rdx_temp;
2263 BasicType elem_type = ek_adapter_opt_spread_type(ek);
2264 int elem_slots = type2size[elem_type]; // 1 or 2
2265 int array_slots = 1; // array is always a T_OBJECT
2266 int length_offset = arrayOopDesc::length_offset_in_bytes();
2267 int elem0_offset = arrayOopDesc::base_offset_in_bytes(elem_type);
2268 __ movptr(rsi_array, vmarg);
2270 Label L_array_is_empty, L_insert_arg_space, L_copy_args, L_args_done;
2271 if (length_can_be_zero) {
2272 // handle the null pointer case, if zero is allowed
2273 Label L_skip;
2274 if (length_constant < 0) {
2275 load_conversion_vminfo(_masm, rbx_temp, rcx_amh_conversion);
2276 __ testl(rbx_temp, rbx_temp);
2277 __ jcc(Assembler::notZero, L_skip);
2278 }
2279 __ testptr(rsi_array, rsi_array);
2280 __ jcc(Assembler::zero, L_array_is_empty);
2281 __ bind(L_skip);
2282 }
2283 __ null_check(rsi_array, oopDesc::klass_offset_in_bytes());
2284 __ load_klass(rdx_array_klass, rsi_array);
2286 // Check the array type.
2287 Register rbx_klass = rbx_temp;
2288 __ load_heap_oop(rbx_klass, rcx_amh_argument); // this is a Class object!
2289 load_klass_from_Class(_masm, rbx_klass);
2291 Label ok_array_klass, bad_array_klass, bad_array_length;
2292 __ check_klass_subtype(rdx_array_klass, rbx_klass, rdi_temp, ok_array_klass);
2293 // If we get here, the type check failed!
2294 __ jmp(bad_array_klass);
2295 __ BIND(ok_array_klass);
2297 // Check length.
2298 if (length_constant >= 0) {
2299 __ cmpl(Address(rsi_array, length_offset), length_constant);
2300 } else {
2301 Register rbx_vminfo = rbx_temp;
2302 load_conversion_vminfo(_masm, rbx_vminfo, rcx_amh_conversion);
2303 __ cmpl(rbx_vminfo, Address(rsi_array, length_offset));
2304 }
2305 __ jcc(Assembler::notEqual, bad_array_length);
2307 Register rdx_argslot_limit = rdx_temp;
2309 // Array length checks out. Now insert any required stack slots.
2310 if (length_constant == -1) {
2311 // Form a pointer to the end of the affected region.
2312 __ lea(rdx_argslot_limit, Address(rax_argslot, Interpreter::stackElementSize));
2313 // 'stack_move' is negative number of words to insert
2314 // This number already accounts for elem_slots.
2315 Register rdi_stack_move = rdi_temp;
2316 load_stack_move(_masm, rdi_stack_move, rcx_recv, true);
2317 __ cmpptr(rdi_stack_move, 0);
2318 assert(stack_move_unit() < 0, "else change this comparison");
2319 __ jcc(Assembler::less, L_insert_arg_space);
2320 __ jcc(Assembler::equal, L_copy_args);
2321 // single argument case, with no array movement
2322 __ BIND(L_array_is_empty);
2323 remove_arg_slots(_masm, -stack_move_unit() * array_slots,
2324 rax_argslot, rbx_temp, rdx_temp);
2325 __ jmp(L_args_done); // no spreading to do
2326 __ BIND(L_insert_arg_space);
2327 // come here in the usual case, stack_move < 0 (2 or more spread arguments)
2328 Register rsi_temp = rsi_array; // spill this
2329 insert_arg_slots(_masm, rdi_stack_move,
2330 rax_argslot, rbx_temp, rsi_temp);
2331 // reload the array since rsi was killed
2332 // reload from rdx_argslot_limit since rax_argslot is now decremented
2333 __ movptr(rsi_array, Address(rdx_argslot_limit, -Interpreter::stackElementSize));
2334 } else if (length_constant >= 1) {
2335 int new_slots = (length_constant * elem_slots) - array_slots;
2336 insert_arg_slots(_masm, new_slots * stack_move_unit(),
2337 rax_argslot, rbx_temp, rdx_temp);
2338 } else if (length_constant == 0) {
2339 __ BIND(L_array_is_empty);
2340 remove_arg_slots(_masm, -stack_move_unit() * array_slots,
2341 rax_argslot, rbx_temp, rdx_temp);
2342 } else {
2343 ShouldNotReachHere();
2344 }
2346 // Copy from the array to the new slots.
2347 // Note: Stack change code preserves integrity of rax_argslot pointer.
2348 // So even after slot insertions, rax_argslot still points to first argument.
2349 // Beware: Arguments that are shallow on the stack are deep in the array,
2350 // and vice versa. So a downward-growing stack (the usual) has to be copied
2351 // elementwise in reverse order from the source array.
2352 __ BIND(L_copy_args);
2353 if (length_constant == -1) {
2354 // [rax_argslot, rdx_argslot_limit) is the area we are inserting into.
2355 // Array element [0] goes at rdx_argslot_limit[-wordSize].
2356 Register rsi_source = rsi_array;
2357 __ lea(rsi_source, Address(rsi_array, elem0_offset));
2358 Register rdx_fill_ptr = rdx_argslot_limit;
2359 Label loop;
2360 __ BIND(loop);
2361 __ addptr(rdx_fill_ptr, -Interpreter::stackElementSize * elem_slots);
2362 move_typed_arg(_masm, elem_type, true,
2363 Address(rdx_fill_ptr, 0), Address(rsi_source, 0),
2364 rbx_temp, rdi_temp);
2365 __ addptr(rsi_source, type2aelembytes(elem_type));
2366 __ cmpptr(rdx_fill_ptr, rax_argslot);
2367 __ jcc(Assembler::above, loop);
2368 } else if (length_constant == 0) {
2369 // nothing to copy
2370 } else {
2371 int elem_offset = elem0_offset;
2372 int slot_offset = length_constant * Interpreter::stackElementSize;
2373 for (int index = 0; index < length_constant; index++) {
2374 slot_offset -= Interpreter::stackElementSize * elem_slots; // fill backward
2375 move_typed_arg(_masm, elem_type, true,
2376 Address(rax_argslot, slot_offset), Address(rsi_array, elem_offset),
2377 rbx_temp, rdi_temp);
2378 elem_offset += type2aelembytes(elem_type);
2379 }
2380 }
2381 __ BIND(L_args_done);
2383 // Arguments are spread. Move to next method handle.
2384 UNPUSH_RSI;
2385 __ load_heap_oop(rcx_recv, rcx_mh_vmtarget);
2386 __ jump_to_method_handle_entry(rcx_recv, rdx_temp);
2388 __ bind(bad_array_klass);
2389 UNPUSH_RSI;
2390 assert(!vmarg.uses(rarg2_required), "must be different registers");
2391 __ load_heap_oop( rarg2_required, Address(rdx_array_klass, java_mirror_offset)); // required type
2392 __ movptr( rarg1_actual, vmarg); // bad array
2393 __ movl( rarg0_code, (int) Bytecodes::_aaload); // who is complaining?
2394 __ jump(ExternalAddress(from_interpreted_entry(_raise_exception)));
2396 __ bind(bad_array_length);
2397 UNPUSH_RSI;
2398 assert(!vmarg.uses(rarg2_required), "must be different registers");
2399 __ mov( rarg2_required, rcx_recv); // AMH requiring a certain length
2400 __ movptr( rarg1_actual, vmarg); // bad array
2401 __ movl( rarg0_code, (int) Bytecodes::_arraylength); // who is complaining?
2402 __ jump(ExternalAddress(from_interpreted_entry(_raise_exception)));
2403 #undef UNPUSH_RSI
2405 break;
2406 }
2408 default:
2409 // do not require all platforms to recognize all adapter types
2410 __ nop();
2411 return;
2412 }
2413 BLOCK_COMMENT(err_msg("} Entry %s", entry_name(ek)));
2414 __ hlt();
2416 address me_cookie = MethodHandleEntry::start_compiled_entry(_masm, interp_entry);
2417 __ unimplemented(entry_name(ek)); // %%% FIXME: NYI
2419 init_entry(ek, MethodHandleEntry::finish_compiled_entry(_masm, me_cookie));
2420 }