jrose@1145: /*
twisti@2436:  * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
jrose@1145:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
jrose@1145:  *
jrose@1145:  * This code is free software; you can redistribute it and/or modify it
jrose@1145:  * under the terms of the GNU General Public License version 2 only, as
jrose@1145:  * published by the Free Software Foundation.
jrose@1145:  *
jrose@1145:  * This code is distributed in the hope that it will be useful, but WITHOUT
jrose@1145:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
jrose@1145:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
jrose@1145:  * version 2 for more details (a copy is included in the LICENSE file that
jrose@1145:  * accompanied this code).
jrose@1145:  *
jrose@1145:  * You should have received a copy of the GNU General Public License version
jrose@1145:  * 2 along with this work; if not, write to the Free Software Foundation,
jrose@1145:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
jrose@1145:  *
trims@1907:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907:  * or visit www.oracle.com if you need additional information or have any
trims@1907:  * questions.
jrose@1145:  *
jrose@1145:  */
jrose@1145: 
stefank@2314: #include "precompiled.hpp"
stefank@2314: #include "interpreter/interpreter.hpp"
stefank@2314: #include "memory/allocation.inline.hpp"
stefank@2314: #include "prims/methodHandles.hpp"
jrose@1145: 
jrose@1145: #define __ _masm->
jrose@1145: 
jrose@2148: #ifdef PRODUCT
jrose@2148: #define BLOCK_COMMENT(str) /* nothing */
jrose@2148: #else
jrose@2148: #define BLOCK_COMMENT(str) __ block_comment(str)
jrose@2148: #endif
jrose@2148: 
jrose@2148: #define BIND(label) bind(label); BLOCK_COMMENT(#label ":")
jrose@2148: 
jrose@1145: address MethodHandleEntry::start_compiled_entry(MacroAssembler* _masm,
jrose@1145:                                                 address interpreted_entry) {
jrose@1145:   // Just before the actual machine code entry point, allocate space
jrose@1145:   // for a MethodHandleEntry::Data record, so that we can manage everything
jrose@1145:   // from one base pointer.
jrose@1145:   __ align(wordSize);
jrose@1145:   address target = __ pc() + sizeof(Data);
jrose@1145:   while (__ pc() < target) {
jrose@1145:     __ nop();
jrose@1145:     __ align(wordSize);
jrose@1145:   }
jrose@1145: 
jrose@1145:   MethodHandleEntry* me = (MethodHandleEntry*) __ pc();
jrose@1145:   me->set_end_address(__ pc());         // set a temporary end_address
jrose@1145:   me->set_from_interpreted_entry(interpreted_entry);
jrose@1145:   me->set_type_checking_entry(NULL);
jrose@1145: 
jrose@1145:   return (address) me;
jrose@1145: }
jrose@1145: 
jrose@1145: MethodHandleEntry* MethodHandleEntry::finish_compiled_entry(MacroAssembler* _masm,
jrose@1145:                                                 address start_addr) {
jrose@1145:   MethodHandleEntry* me = (MethodHandleEntry*) start_addr;
jrose@1145:   assert(me->end_address() == start_addr, "valid ME");
jrose@1145: 
jrose@1145:   // Fill in the real end_address:
jrose@1145:   __ align(wordSize);
jrose@1145:   me->set_end_address(__ pc());
jrose@1145: 
jrose@1145:   return me;
jrose@1145: }
jrose@1145: 
never@2895: // stack walking support
never@2895: 
never@2895: frame MethodHandles::ricochet_frame_sender(const frame& fr, RegisterMap *map) {
never@2895:   RicochetFrame* f = RicochetFrame::from_frame(fr);
never@2895:   if (map->update_map())
never@2895:     frame::update_map_with_saved_link(map, &f->_sender_link);
never@2895:   return frame(f->extended_sender_sp(), f->exact_sender_sp(), f->sender_link(), f->sender_pc());
never@2895: }
never@2895: 
never@2895: void MethodHandles::ricochet_frame_oops_do(const frame& fr, OopClosure* blk, const RegisterMap* reg_map) {
never@2895:   RicochetFrame* f = RicochetFrame::from_frame(fr);
never@2895: 
never@2895:   // pick up the argument type descriptor:
never@2895:   Thread* thread = Thread::current();
never@2895:   Handle cookie(thread, f->compute_saved_args_layout(true, true));
never@2895: 
never@2895:   // process fixed part
never@2895:   blk->do_oop((oop*)f->saved_target_addr());
never@2895:   blk->do_oop((oop*)f->saved_args_layout_addr());
never@2895: 
never@2895:   // process variable arguments:
never@2895:   if (cookie.is_null())  return;  // no arguments to describe
never@2895: 
never@2895:   // the cookie is actually the invokeExact method for my target
never@2895:   // his argument signature is what I'm interested in
never@2895:   assert(cookie->is_method(), "");
never@2895:   methodHandle invoker(thread, methodOop(cookie()));
never@2895:   assert(invoker->name() == vmSymbols::invokeExact_name(), "must be this kind of method");
never@2895:   assert(!invoker->is_static(), "must have MH argument");
never@2895:   int slot_count = invoker->size_of_parameters();
never@2895:   assert(slot_count >= 1, "must include 'this'");
never@2895:   intptr_t* base = f->saved_args_base();
never@2895:   intptr_t* retval = NULL;
never@2895:   if (f->has_return_value_slot())
never@2895:     retval = f->return_value_slot_addr();
never@2895:   int slot_num = slot_count;
never@2895:   intptr_t* loc = &base[slot_num -= 1];
never@2895:   //blk->do_oop((oop*) loc);   // original target, which is irrelevant
never@2895:   int arg_num = 0;
never@2895:   for (SignatureStream ss(invoker->signature()); !ss.is_done(); ss.next()) {
never@2895:     if (ss.at_return_type())  continue;
never@2895:     BasicType ptype = ss.type();
never@2895:     if (ptype == T_ARRAY)  ptype = T_OBJECT; // fold all refs to T_OBJECT
never@2895:     assert(ptype >= T_BOOLEAN && ptype <= T_OBJECT, "not array or void");
never@2895:     loc = &base[slot_num -= type2size[ptype]];
never@2895:     bool is_oop = (ptype == T_OBJECT && loc != retval);
never@2895:     if (is_oop)  blk->do_oop((oop*)loc);
never@2895:     arg_num += 1;
never@2895:   }
never@2895:   assert(slot_num == 0, "must have processed all the arguments");
never@2895: }
never@2895: 
never@2895: oop MethodHandles::RicochetFrame::compute_saved_args_layout(bool read_cache, bool write_cache) {
never@2895:   oop cookie = NULL;
never@2895:   if (read_cache) {
never@2895:     cookie = saved_args_layout();
never@2895:     if (cookie != NULL)  return cookie;
never@2895:   }
never@2895:   oop target = saved_target();
never@2895:   oop mtype  = java_lang_invoke_MethodHandle::type(target);
never@2895:   oop mtform = java_lang_invoke_MethodType::form(mtype);
never@2895:   cookie = java_lang_invoke_MethodTypeForm::vmlayout(mtform);
never@2895:   if (write_cache)  {
never@2895:     (*saved_args_layout_addr()) = cookie;
never@2895:   }
never@2895:   return cookie;
never@2895: }
never@2895: 
never@2895: void MethodHandles::RicochetFrame::generate_ricochet_blob(MacroAssembler* _masm,
never@2895:                                                           // output params:
never@2895:                                                           int* frame_size_in_words,
never@2895:                                                           int* bounce_offset,
never@2895:                                                           int* exception_offset) {
never@2895:   (*frame_size_in_words) = RicochetFrame::frame_size_in_bytes() / wordSize;
never@2895: 
never@2895:   address start = __ pc();
never@2895: 
jrose@1145: #ifdef ASSERT
never@2895:   __ hlt(); __ hlt(); __ hlt();
never@2895:   // here's a hint of something special:
never@2895:   __ push(MAGIC_NUMBER_1);
never@2895:   __ push(MAGIC_NUMBER_2);
never@2895: #endif //ASSERT
never@2895:   __ hlt();  // not reached
never@2895: 
never@2895:   // A return PC has just been popped from the stack.
never@2895:   // Return values are in registers.
never@2895:   // The ebp points into the RicochetFrame, which contains
never@2895:   // a cleanup continuation we must return to.
never@2895: 
never@2895:   (*bounce_offset) = __ pc() - start;
never@2895:   BLOCK_COMMENT("ricochet_blob.bounce");
never@2895: 
never@2895:   if (VerifyMethodHandles)  RicochetFrame::verify_clean(_masm);
twisti@2903:   trace_method_handle(_masm, "return/ricochet_blob.bounce");
never@2895: 
never@2895:   __ jmp(frame_address(continuation_offset_in_bytes()));
never@2895:   __ hlt();
never@2895:   DEBUG_ONLY(__ push(MAGIC_NUMBER_2));
never@2895: 
never@2895:   (*exception_offset) = __ pc() - start;
never@2895:   BLOCK_COMMENT("ricochet_blob.exception");
never@2895: 
never@2895:   // compare this to Interpreter::rethrow_exception_entry, which is parallel code
never@2895:   // for example, see TemplateInterpreterGenerator::generate_throw_exception
never@2895:   // Live registers in:
never@2895:   //   rax: exception
never@2895:   //   rdx: return address/pc that threw exception (ignored, always equal to bounce addr)
never@2895:   __ verify_oop(rax);
never@2895: 
never@2895:   // no need to empty_FPU_stack or reinit_heapbase, since caller frame will do the same if needed
never@2895: 
never@2895:   // Take down the frame.
never@2895: 
never@2895:   // Cf. InterpreterMacroAssembler::remove_activation.
never@2895:   leave_ricochet_frame(_masm, /*rcx_recv=*/ noreg,
never@2895:                        saved_last_sp_register(),
never@2895:                        /*sender_pc_reg=*/ rdx);
never@2895: 
never@2895:   // In between activations - previous activation type unknown yet
never@2895:   // compute continuation point - the continuation point expects the
never@2895:   // following registers set up:
never@2895:   //
never@2895:   // rax: exception
never@2895:   // rdx: return address/pc that threw exception
never@2895:   // rsp: expression stack of caller
never@2895:   // rbp: ebp of caller
never@2895:   __ push(rax);                                  // save exception
never@2895:   __ push(rdx);                                  // save return address
never@2895:   Register thread_reg = LP64_ONLY(r15_thread) NOT_LP64(rdi);
never@2895:   NOT_LP64(__ get_thread(thread_reg));
never@2895:   __ call_VM_leaf(CAST_FROM_FN_PTR(address,
never@2895:                                    SharedRuntime::exception_handler_for_return_address),
never@2895:                   thread_reg, rdx);
never@2895:   __ mov(rbx, rax);                              // save exception handler
never@2895:   __ pop(rdx);                                   // restore return address
never@2895:   __ pop(rax);                                   // restore exception
never@2895:   __ jmp(rbx);                                   // jump to exception
never@2895:                                                  // handler of caller
never@2895: }
never@2895: 
never@2895: void MethodHandles::RicochetFrame::enter_ricochet_frame(MacroAssembler* _masm,
never@2895:                                                         Register rcx_recv,
never@2895:                                                         Register rax_argv,
never@2895:                                                         address return_handler,
never@2895:                                                         Register rbx_temp) {
never@2895:   const Register saved_last_sp = saved_last_sp_register();
never@2895:   Address rcx_mh_vmtarget(    rcx_recv, java_lang_invoke_MethodHandle::vmtarget_offset_in_bytes() );
never@2895:   Address rcx_amh_conversion( rcx_recv, java_lang_invoke_AdapterMethodHandle::conversion_offset_in_bytes() );
never@2895: 
never@2895:   // Push the RicochetFrame a word at a time.
never@2895:   // This creates something similar to an interpreter frame.
never@2895:   // Cf. TemplateInterpreterGenerator::generate_fixed_frame.
never@2895:   BLOCK_COMMENT("push RicochetFrame {");
never@2895:   DEBUG_ONLY(int rfo = (int) sizeof(RicochetFrame));
never@2895:   assert((rfo -= wordSize) == RicochetFrame::sender_pc_offset_in_bytes(), "");
never@2895: #define RF_FIELD(push_value, name)                                      \
never@2895:   { push_value;                                                         \
never@2895:     assert((rfo -= wordSize) == RicochetFrame::name##_offset_in_bytes(), ""); }
never@2895:   RF_FIELD(__ push(rbp),                   sender_link);
never@2895:   RF_FIELD(__ push(saved_last_sp),         exact_sender_sp);  // rsi/r13
never@2895:   RF_FIELD(__ pushptr(rcx_amh_conversion), conversion);
never@2895:   RF_FIELD(__ push(rax_argv),              saved_args_base);   // can be updated if args are shifted
never@2895:   RF_FIELD(__ push((int32_t) NULL_WORD),   saved_args_layout); // cache for GC layout cookie
never@2895:   if (UseCompressedOops) {
never@2895:     __ load_heap_oop(rbx_temp, rcx_mh_vmtarget);
never@2895:     RF_FIELD(__ push(rbx_temp),            saved_target);
never@2895:   } else {
never@2895:     RF_FIELD(__ pushptr(rcx_mh_vmtarget),  saved_target);
never@2895:   }
never@2895:   __ lea(rbx_temp, ExternalAddress(return_handler));
never@2895:   RF_FIELD(__ push(rbx_temp),              continuation);
never@2895: #undef RF_FIELD
never@2895:   assert(rfo == 0, "fully initialized the RicochetFrame");
never@2895:   // compute new frame pointer:
never@2895:   __ lea(rbp, Address(rsp, RicochetFrame::sender_link_offset_in_bytes()));
never@2895:   // Push guard word #1 in debug mode.
never@2895:   DEBUG_ONLY(__ push((int32_t) RicochetFrame::MAGIC_NUMBER_1));
never@2895:   // For debugging, leave behind an indication of which stub built this frame.
never@2895:   DEBUG_ONLY({ Label L; __ call(L, relocInfo::none); __ bind(L); });
never@2895:   BLOCK_COMMENT("} RicochetFrame");
never@2895: }
never@2895: 
never@2895: void MethodHandles::RicochetFrame::leave_ricochet_frame(MacroAssembler* _masm,
never@2895:                                                         Register rcx_recv,
never@2895:                                                         Register new_sp_reg,
never@2895:                                                         Register sender_pc_reg) {
never@2895:   assert_different_registers(rcx_recv, new_sp_reg, sender_pc_reg);
never@2895:   const Register saved_last_sp = saved_last_sp_register();
never@2895:   // Take down the frame.
never@2895:   // Cf. InterpreterMacroAssembler::remove_activation.
never@2895:   BLOCK_COMMENT("end_ricochet_frame {");
never@2895:   // TO DO: If (exact_sender_sp - extended_sender_sp) > THRESH, compact the frame down.
never@2895:   // This will keep stack in bounds even with unlimited tailcalls, each with an adapter.
never@2895:   if (rcx_recv->is_valid())
never@2895:     __ movptr(rcx_recv,    RicochetFrame::frame_address(RicochetFrame::saved_target_offset_in_bytes()));
never@2895:   __ movptr(sender_pc_reg, RicochetFrame::frame_address(RicochetFrame::sender_pc_offset_in_bytes()));
never@2895:   __ movptr(saved_last_sp, RicochetFrame::frame_address(RicochetFrame::exact_sender_sp_offset_in_bytes()));
never@2895:   __ movptr(rbp,           RicochetFrame::frame_address(RicochetFrame::sender_link_offset_in_bytes()));
never@2895:   __ mov(rsp, new_sp_reg);
never@2895:   BLOCK_COMMENT("} end_ricochet_frame");
never@2895: }
never@2895: 
never@2895: // Emit code to verify that RBP is pointing at a valid ricochet frame.
never@2895: #ifdef ASSERT
never@2895: enum {
never@2895:   ARG_LIMIT = 255, SLOP = 4,
never@2895:   // use this parameter for checking for garbage stack movements:
never@2895:   UNREASONABLE_STACK_MOVE = (ARG_LIMIT + SLOP)
never@2895:   // the slop defends against false alarms due to fencepost errors
never@2895: };
never@2895: 
never@2895: void MethodHandles::RicochetFrame::verify_clean(MacroAssembler* _masm) {
never@2895:   // The stack should look like this:
never@2895:   //    ... keep1 | dest=42 | keep2 | RF | magic | handler | magic | recursive args |
never@2895:   // Check various invariants.
never@2895:   verify_offsets();
never@2895: 
never@2895:   Register rdi_temp = rdi;
never@2895:   Register rcx_temp = rcx;
never@2895:   { __ push(rdi_temp); __ push(rcx_temp); }
never@2895: #define UNPUSH_TEMPS \
never@2895:   { __ pop(rcx_temp);  __ pop(rdi_temp); }
never@2895: 
never@2895:   Address magic_number_1_addr  = RicochetFrame::frame_address(RicochetFrame::magic_number_1_offset_in_bytes());
never@2895:   Address magic_number_2_addr  = RicochetFrame::frame_address(RicochetFrame::magic_number_2_offset_in_bytes());
never@2895:   Address continuation_addr    = RicochetFrame::frame_address(RicochetFrame::continuation_offset_in_bytes());
never@2895:   Address conversion_addr      = RicochetFrame::frame_address(RicochetFrame::conversion_offset_in_bytes());
never@2895:   Address saved_args_base_addr = RicochetFrame::frame_address(RicochetFrame::saved_args_base_offset_in_bytes());
never@2895: 
never@2895:   Label L_bad, L_ok;
never@2895:   BLOCK_COMMENT("verify_clean {");
never@2895:   // Magic numbers must check out:
never@2895:   __ cmpptr(magic_number_1_addr, (int32_t) MAGIC_NUMBER_1);
never@2895:   __ jcc(Assembler::notEqual, L_bad);
never@2895:   __ cmpptr(magic_number_2_addr, (int32_t) MAGIC_NUMBER_2);
never@2895:   __ jcc(Assembler::notEqual, L_bad);
never@2895: 
never@2895:   // Arguments pointer must look reasonable:
never@2895:   __ movptr(rcx_temp, saved_args_base_addr);
never@2895:   __ cmpptr(rcx_temp, rbp);
never@2895:   __ jcc(Assembler::below, L_bad);
never@2895:   __ subptr(rcx_temp, UNREASONABLE_STACK_MOVE * Interpreter::stackElementSize);
never@2895:   __ cmpptr(rcx_temp, rbp);
never@2895:   __ jcc(Assembler::above, L_bad);
never@2895: 
never@2895:   load_conversion_dest_type(_masm, rdi_temp, conversion_addr);
never@2895:   __ cmpl(rdi_temp, T_VOID);
never@2895:   __ jcc(Assembler::equal, L_ok);
never@2895:   __ movptr(rcx_temp, saved_args_base_addr);
never@2895:   load_conversion_vminfo(_masm, rdi_temp, conversion_addr);
never@2895:   __ cmpptr(Address(rcx_temp, rdi_temp, Interpreter::stackElementScale()),
never@2895:             (int32_t) RETURN_VALUE_PLACEHOLDER);
never@2895:   __ jcc(Assembler::equal, L_ok);
never@2895:   __ BIND(L_bad);
never@2895:   UNPUSH_TEMPS;
never@2895:   __ stop("damaged ricochet frame");
never@2895:   __ BIND(L_ok);
never@2895:   UNPUSH_TEMPS;
never@2895:   BLOCK_COMMENT("} verify_clean");
never@2895: 
never@2895: #undef UNPUSH_TEMPS
never@2895: 
never@2895: }
never@2895: #endif //ASSERT
never@2895: 
never@2895: void MethodHandles::load_klass_from_Class(MacroAssembler* _masm, Register klass_reg) {
never@2895:   if (VerifyMethodHandles)
never@2895:     verify_klass(_masm, klass_reg, SystemDictionaryHandles::Class_klass(),
never@2895:                  "AMH argument is a Class");
never@2895:   __ load_heap_oop(klass_reg, Address(klass_reg, java_lang_Class::klass_offset_in_bytes()));
never@2895: }
never@2895: 
never@2895: void MethodHandles::load_conversion_vminfo(MacroAssembler* _masm, Register reg, Address conversion_field_addr) {
never@2895:   int bits   = BitsPerByte;
never@2895:   int offset = (CONV_VMINFO_SHIFT / bits);
never@2895:   int shift  = (CONV_VMINFO_SHIFT % bits);
never@2895:   __ load_unsigned_byte(reg, conversion_field_addr.plus_disp(offset));
never@2895:   assert(CONV_VMINFO_MASK == right_n_bits(bits - shift), "else change type of previous load");
never@2895:   assert(shift == 0, "no shift needed");
never@2895: }
never@2895: 
never@2895: void MethodHandles::load_conversion_dest_type(MacroAssembler* _masm, Register reg, Address conversion_field_addr) {
never@2895:   int bits   = BitsPerByte;
never@2895:   int offset = (CONV_DEST_TYPE_SHIFT / bits);
never@2895:   int shift  = (CONV_DEST_TYPE_SHIFT % bits);
never@2895:   __ load_unsigned_byte(reg, conversion_field_addr.plus_disp(offset));
never@2895:   assert(CONV_TYPE_MASK == right_n_bits(bits - shift), "else change type of previous load");
never@2895:   __ shrl(reg, shift);
never@2895:   DEBUG_ONLY(int conv_type_bits = (int) exact_log2(CONV_TYPE_MASK+1));
never@2895:   assert((shift + conv_type_bits) == bits, "left justified in byte");
never@2895: }
never@2895: 
never@2895: void MethodHandles::load_stack_move(MacroAssembler* _masm,
never@2895:                                     Register rdi_stack_move,
never@2895:                                     Register rcx_amh,
never@2895:                                     bool might_be_negative) {
never@2895:   BLOCK_COMMENT("load_stack_move");
never@2895:   Address rcx_amh_conversion(rcx_amh, java_lang_invoke_AdapterMethodHandle::conversion_offset_in_bytes());
never@2895:   __ movl(rdi_stack_move, rcx_amh_conversion);
never@2895:   __ sarl(rdi_stack_move, CONV_STACK_MOVE_SHIFT);
never@2895: #ifdef _LP64
never@2895:   if (might_be_negative) {
never@2895:     // clean high bits of stack motion register (was loaded as an int)
never@2895:     __ movslq(rdi_stack_move, rdi_stack_move);
never@2895:   }
never@2895: #endif //_LP64
never@2895:   if (VerifyMethodHandles) {
never@2895:     Label L_ok, L_bad;
never@2895:     int32_t stack_move_limit = 0x4000;  // extra-large
never@2895:     __ cmpptr(rdi_stack_move, stack_move_limit);
never@2895:     __ jcc(Assembler::greaterEqual, L_bad);
never@2895:     __ cmpptr(rdi_stack_move, -stack_move_limit);
never@2895:     __ jcc(Assembler::greater, L_ok);
never@2895:     __ bind(L_bad);
never@2895:     __ stop("load_stack_move of garbage value");
never@2895:     __ BIND(L_ok);
never@2895:   }
never@2895: }
never@2895: 
never@2895: #ifndef PRODUCT
never@2895: void MethodHandles::RicochetFrame::verify_offsets() {
never@2895:   // Check compatibility of this struct with the more generally used offsets of class frame:
never@2895:   int ebp_off = sender_link_offset_in_bytes();  // offset from struct base to local rbp value
never@2895:   assert(ebp_off + wordSize*frame::interpreter_frame_method_offset      == saved_args_base_offset_in_bytes(), "");
never@2895:   assert(ebp_off + wordSize*frame::interpreter_frame_last_sp_offset     == conversion_offset_in_bytes(), "");
never@2895:   assert(ebp_off + wordSize*frame::interpreter_frame_sender_sp_offset   == exact_sender_sp_offset_in_bytes(), "");
never@2895:   // These last two have to be exact:
never@2895:   assert(ebp_off + wordSize*frame::link_offset                          == sender_link_offset_in_bytes(), "");
never@2895:   assert(ebp_off + wordSize*frame::return_addr_offset                   == sender_pc_offset_in_bytes(), "");
never@2895: }
never@2895: 
never@2895: void MethodHandles::RicochetFrame::verify() const {
never@2895:   verify_offsets();
never@2895:   assert(magic_number_1() == MAGIC_NUMBER_1, "");
never@2895:   assert(magic_number_2() == MAGIC_NUMBER_2, "");
never@2895:   if (!Universe::heap()->is_gc_active()) {
never@2895:     if (saved_args_layout() != NULL) {
never@2895:       assert(saved_args_layout()->is_method(), "must be valid oop");
never@2895:     }
never@2895:     if (saved_target() != NULL) {
never@2895:       assert(java_lang_invoke_MethodHandle::is_instance(saved_target()), "checking frame value");
never@2895:     }
never@2895:   }
never@2895:   int conv_op = adapter_conversion_op(conversion());
never@2895:   assert(conv_op == java_lang_invoke_AdapterMethodHandle::OP_COLLECT_ARGS ||
never@2895:          conv_op == java_lang_invoke_AdapterMethodHandle::OP_FOLD_ARGS ||
never@2895:          conv_op == java_lang_invoke_AdapterMethodHandle::OP_PRIM_TO_REF,
never@2895:          "must be a sane conversion");
never@2895:   if (has_return_value_slot()) {
never@2895:     assert(*return_value_slot_addr() == RETURN_VALUE_PLACEHOLDER, "");
never@2895:   }
never@2895: }
never@2895: #endif //PRODUCT
never@2895: 
never@2895: #ifdef ASSERT
never@2895: void MethodHandles::verify_argslot(MacroAssembler* _masm,
never@2895:                                    Register argslot_reg,
never@2895:                                    const char* error_message) {
jrose@1145:   // Verify that argslot lies within (rsp, rbp].
jrose@1145:   Label L_ok, L_bad;
never@2895:   BLOCK_COMMENT("verify_argslot {");
twisti@1739:   __ cmpptr(argslot_reg, rbp);
twisti@1570:   __ jccb(Assembler::above, L_bad);
twisti@1739:   __ cmpptr(rsp, argslot_reg);
twisti@1570:   __ jccb(Assembler::below, L_ok);
jrose@1145:   __ bind(L_bad);
jrose@1145:   __ stop(error_message);
never@2895:   __ BIND(L_ok);
jrose@2148:   BLOCK_COMMENT("} verify_argslot");
jrose@1145: }
jrose@1145: 
never@2895: void MethodHandles::verify_argslots(MacroAssembler* _masm,
never@2895:                                     RegisterOrConstant arg_slots,
never@2895:                                     Register arg_slot_base_reg,
never@2895:                                     bool negate_argslots,
never@2895:                                     const char* error_message) {
never@2895:   // Verify that [argslot..argslot+size) lies within (rsp, rbp).
never@2895:   Label L_ok, L_bad;
never@2895:   Register rdi_temp = rdi;
never@2895:   BLOCK_COMMENT("verify_argslots {");
never@2895:   __ push(rdi_temp);
never@2895:   if (negate_argslots) {
never@2895:     if (arg_slots.is_constant()) {
never@2895:       arg_slots = -1 * arg_slots.as_constant();
never@2895:     } else {
never@2895:       __ movptr(rdi_temp, arg_slots);
never@2895:       __ negptr(rdi_temp);
never@2895:       arg_slots = rdi_temp;
never@2895:     }
never@2895:   }
never@2895:   __ lea(rdi_temp, Address(arg_slot_base_reg, arg_slots, Interpreter::stackElementScale()));
never@2895:   __ cmpptr(rdi_temp, rbp);
never@2895:   __ pop(rdi_temp);
never@2895:   __ jcc(Assembler::above, L_bad);
never@2895:   __ cmpptr(rsp, arg_slot_base_reg);
never@2895:   __ jcc(Assembler::below, L_ok);
never@2895:   __ bind(L_bad);
never@2895:   __ stop(error_message);
never@2895:   __ BIND(L_ok);
never@2895:   BLOCK_COMMENT("} verify_argslots");
never@2895: }
never@2895: 
never@2895: // Make sure that arg_slots has the same sign as the given direction.
never@2895: // If (and only if) arg_slots is a assembly-time constant, also allow it to be zero.
never@2895: void MethodHandles::verify_stack_move(MacroAssembler* _masm,
never@2895:                                       RegisterOrConstant arg_slots, int direction) {
never@2895:   bool allow_zero = arg_slots.is_constant();
never@2895:   if (direction == 0) { direction = +1; allow_zero = true; }
never@2895:   assert(stack_move_unit() == -1, "else add extra checks here");
never@2895:   if (arg_slots.is_register()) {
never@2895:     Label L_ok, L_bad;
never@2895:     BLOCK_COMMENT("verify_stack_move {");
never@2895:     // testl(arg_slots.as_register(), -stack_move_unit() - 1);  // no need
never@2895:     // jcc(Assembler::notZero, L_bad);
never@2895:     __ cmpptr(arg_slots.as_register(), (int32_t) NULL_WORD);
never@2895:     if (direction > 0) {
never@2895:       __ jcc(allow_zero ? Assembler::less : Assembler::lessEqual, L_bad);
never@2895:       __ cmpptr(arg_slots.as_register(), (int32_t) UNREASONABLE_STACK_MOVE);
never@2895:       __ jcc(Assembler::less, L_ok);
never@2895:     } else {
never@2895:       __ jcc(allow_zero ? Assembler::greater : Assembler::greaterEqual, L_bad);
never@2895:       __ cmpptr(arg_slots.as_register(), (int32_t) -UNREASONABLE_STACK_MOVE);
never@2895:       __ jcc(Assembler::greater, L_ok);
never@2895:     }
never@2895:     __ bind(L_bad);
never@2895:     if (direction > 0)
never@2895:       __ stop("assert arg_slots > 0");
never@2895:     else
never@2895:       __ stop("assert arg_slots < 0");
never@2895:     __ BIND(L_ok);
never@2895:     BLOCK_COMMENT("} verify_stack_move");
never@2895:   } else {
never@2895:     intptr_t size = arg_slots.as_constant();
never@2895:     if (direction < 0)  size = -size;
never@2895:     assert(size >= 0, "correct direction of constant move");
never@2895:     assert(size < UNREASONABLE_STACK_MOVE, "reasonable size of constant move");
never@2895:   }
never@2895: }
never@2895: 
never@2895: void MethodHandles::verify_klass(MacroAssembler* _masm,
never@2895:                                  Register obj, KlassHandle klass,
never@2895:                                  const char* error_message) {
never@2895:   oop* klass_addr = klass.raw_value();
never@2895:   assert(klass_addr >= SystemDictionaryHandles::Object_klass().raw_value() &&
never@2895:          klass_addr <= SystemDictionaryHandles::Long_klass().raw_value(),
never@2895:          "must be one of the SystemDictionaryHandles");
never@2895:   Register temp = rdi;
never@2895:   Label L_ok, L_bad;
never@2895:   BLOCK_COMMENT("verify_klass {");
never@2895:   __ verify_oop(obj);
never@2895:   __ testptr(obj, obj);
never@2895:   __ jcc(Assembler::zero, L_bad);
never@2895:   __ push(temp);
never@2895:   __ load_klass(temp, obj);
never@2895:   __ cmpptr(temp, ExternalAddress((address) klass_addr));
never@2895:   __ jcc(Assembler::equal, L_ok);
never@2895:   intptr_t super_check_offset = klass->super_check_offset();
never@2895:   __ movptr(temp, Address(temp, super_check_offset));
never@2895:   __ cmpptr(temp, ExternalAddress((address) klass_addr));
never@2895:   __ jcc(Assembler::equal, L_ok);
never@2895:   __ pop(temp);
never@2895:   __ bind(L_bad);
never@2895:   __ stop(error_message);
never@2895:   __ BIND(L_ok);
never@2895:   __ pop(temp);
never@2895:   BLOCK_COMMENT("} verify_klass");
never@2895: }
never@2895: #endif //ASSERT
jrose@1145: 
jrose@1145: // Code generation
jrose@1145: address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm) {
jrose@1145:   // rbx: methodOop
jrose@1145:   // rcx: receiver method handle (must load from sp[MethodTypeForm.vmslots])
jrose@1145:   // rsi/r13: sender SP (must preserve; see prepare_to_jump_from_interpreted)
jrose@2148:   // rdx, rdi: garbage temp, blown away
jrose@1145: 
jrose@1145:   Register rbx_method = rbx;
jrose@1145:   Register rcx_recv   = rcx;
jrose@1145:   Register rax_mtype  = rax;
jrose@1145:   Register rdx_temp   = rdx;
jrose@2148:   Register rdi_temp   = rdi;
jrose@1145: 
jrose@1145:   // emit WrongMethodType path first, to enable jccb back-branch from main path
jrose@1145:   Label wrong_method_type;
jrose@1145:   __ bind(wrong_method_type);
jrose@2148:   Label invoke_generic_slow_path;
jrose@2148:   assert(methodOopDesc::intrinsic_id_size_in_bytes() == sizeof(u1), "");;
jrose@2148:   __ cmpb(Address(rbx_method, methodOopDesc::intrinsic_id_offset_in_bytes()), (int) vmIntrinsics::_invokeExact);
jrose@2148:   __ jcc(Assembler::notEqual, invoke_generic_slow_path);
jrose@1145:   __ push(rax_mtype);       // required mtype
jrose@1145:   __ push(rcx_recv);        // bad mh (1st stacked argument)
jrose@1145:   __ jump(ExternalAddress(Interpreter::throw_WrongMethodType_entry()));
jrose@1145: 
jrose@1145:   // here's where control starts out:
jrose@1145:   __ align(CodeEntryAlignment);
jrose@1145:   address entry_point = __ pc();
jrose@1145: 
jrose@1145:   // fetch the MethodType from the method handle into rax (the 'check' register)
never@2895:   // FIXME: Interpreter should transmit pre-popped stack pointer, to locate base of arg list.
never@2895:   // This would simplify several touchy bits of code.
never@2895:   // See 6984712: JSR 292 method handle calls need a clean argument base pointer
jrose@1145:   {
jrose@1145:     Register tem = rbx_method;
jrose@1145:     for (jint* pchase = methodOopDesc::method_type_offsets_chain(); (*pchase) != -1; pchase++) {
jrose@1145:       __ movptr(rax_mtype, Address(tem, *pchase));
jrose@1145:       tem = rax_mtype;          // in case there is another indirection
jrose@1145:     }
jrose@1145:   }
jrose@1145: 
jrose@1145:   // given the MethodType, find out where the MH argument is buried
jrose@2639:   __ load_heap_oop(rdx_temp, Address(rax_mtype, __ delayed_value(java_lang_invoke_MethodType::form_offset_in_bytes, rdi_temp)));
jrose@2148:   Register rdx_vmslots = rdx_temp;
jrose@2639:   __ movl(rdx_vmslots, Address(rdx_temp, __ delayed_value(java_lang_invoke_MethodTypeForm::vmslots_offset_in_bytes, rdi_temp)));
never@2895:   Address mh_receiver_slot_addr = __ argument_address(rdx_vmslots);
never@2895:   __ movptr(rcx_recv, mh_receiver_slot_addr);
jrose@1145: 
jrose@2148:   trace_method_handle(_masm, "invokeExact");
jrose@2148: 
jrose@2148:   __ check_method_handle_type(rax_mtype, rcx_recv, rdi_temp, wrong_method_type);
never@2895: 
never@2895:   // Nobody uses the MH receiver slot after this.  Make sure.
never@2895:   DEBUG_ONLY(__ movptr(mh_receiver_slot_addr, (int32_t)0x999999));
never@2895: 
jrose@2148:   __ jump_to_method_handle_entry(rcx_recv, rdi_temp);
jrose@2148: 
jrose@2148:   // for invokeGeneric (only), apply argument and result conversions on the fly
jrose@2148:   __ bind(invoke_generic_slow_path);
jrose@2148: #ifdef ASSERT
never@2895:   if (VerifyMethodHandles) {
never@2895:     Label L;
jrose@2148:     __ cmpb(Address(rbx_method, methodOopDesc::intrinsic_id_offset_in_bytes()), (int) vmIntrinsics::_invokeGeneric);
jrose@2148:     __ jcc(Assembler::equal, L);
jrose@2148:     __ stop("bad methodOop::intrinsic_id");
jrose@2148:     __ bind(L);
jrose@2148:   }
jrose@2148: #endif //ASSERT
jrose@2148:   Register rbx_temp = rbx_method;  // don't need it now
jrose@2148: 
jrose@2148:   // make room on the stack for another pointer:
jrose@2148:   Register rcx_argslot = rcx_recv;
jrose@2148:   __ lea(rcx_argslot, __ argument_address(rdx_vmslots, 1));
never@2895:   insert_arg_slots(_masm, 2 * stack_move_unit(),
jrose@2148:                    rcx_argslot, rbx_temp, rdx_temp);
jrose@2148: 
jrose@2148:   // load up an adapter from the calling type (Java weaves this)
jrose@2148:   Register rdx_adapter = rdx_temp;
twisti@2903:   __ load_heap_oop(rdx_temp,    Address(rax_mtype, __ delayed_value(java_lang_invoke_MethodType::form_offset_in_bytes,               rdi_temp)));
twisti@2903:   __ load_heap_oop(rdx_adapter, Address(rdx_temp,  __ delayed_value(java_lang_invoke_MethodTypeForm::genericInvoker_offset_in_bytes, rdi_temp)));
twisti@2903:   __ verify_oop(rdx_adapter);
jrose@2148:   __ movptr(Address(rcx_argslot, 1 * Interpreter::stackElementSize), rdx_adapter);
jrose@2148:   // As a trusted first argument, pass the type being called, so the adapter knows
jrose@2148:   // the actual types of the arguments and return values.
jrose@2148:   // (Generic invokers are shared among form-families of method-type.)
jrose@2148:   __ movptr(Address(rcx_argslot, 0 * Interpreter::stackElementSize), rax_mtype);
jrose@2148:   // FIXME: assert that rdx_adapter is of the right method-type.
jrose@2148:   __ mov(rcx, rdx_adapter);
jrose@2148:   trace_method_handle(_masm, "invokeGeneric");
jrose@2148:   __ jump_to_method_handle_entry(rcx, rdi_temp);
jrose@2148: 
jrose@1145:   return entry_point;
jrose@1145: }
jrose@1145: 
never@2895: // Workaround for C++ overloading nastiness on '0' for RegisterOrConstant.
never@2895: static RegisterOrConstant constant(int value) {
never@2895:   return RegisterOrConstant(value);
never@2895: }
never@2895: 
jrose@1145: // Helper to insert argument slots into the stack.
never@2895: // arg_slots must be a multiple of stack_move_unit() and < 0
never@2895: // rax_argslot is decremented to point to the new (shifted) location of the argslot
never@2895: // But, rdx_temp ends up holding the original value of rax_argslot.
jrose@1145: void MethodHandles::insert_arg_slots(MacroAssembler* _masm,
jrose@1145:                                      RegisterOrConstant arg_slots,
jrose@1145:                                      Register rax_argslot,
never@2895:                                      Register rbx_temp, Register rdx_temp) {
never@2895:   // allow constant zero
never@2895:   if (arg_slots.is_constant() && arg_slots.as_constant() == 0)
never@2895:     return;
jrose@1145:   assert_different_registers(rax_argslot, rbx_temp, rdx_temp,
jrose@1145:                              (!arg_slots.is_register() ? rsp : arg_slots.as_register()));
never@2895:   if (VerifyMethodHandles)
never@2895:     verify_argslot(_masm, rax_argslot, "insertion point must fall within current frame");
never@2895:   if (VerifyMethodHandles)
never@2895:     verify_stack_move(_masm, arg_slots, -1);
jrose@1145: 
jrose@1145:   // Make space on the stack for the inserted argument(s).
jrose@1145:   // Then pull down everything shallower than rax_argslot.
jrose@1145:   // The stacked return address gets pulled down with everything else.
jrose@1145:   // That is, copy [rsp, argslot) downward by -size words.  In pseudo-code:
jrose@1145:   //   rsp -= size;
jrose@1145:   //   for (rdx = rsp + size; rdx < argslot; rdx++)
jrose@1145:   //     rdx[-size] = rdx[0]
jrose@1145:   //   argslot -= size;
jrose@2148:   BLOCK_COMMENT("insert_arg_slots {");
jrose@1145:   __ mov(rdx_temp, rsp);                        // source pointer for copy
never@2895:   __ lea(rsp, Address(rsp, arg_slots, Interpreter::stackElementScale()));
jrose@1145:   {
jrose@1145:     Label loop;
jrose@2148:     __ BIND(loop);
jrose@1145:     // pull one word down each time through the loop
jrose@1145:     __ movptr(rbx_temp, Address(rdx_temp, 0));
never@2895:     __ movptr(Address(rdx_temp, arg_slots, Interpreter::stackElementScale()), rbx_temp);
jrose@1145:     __ addptr(rdx_temp, wordSize);
jrose@1145:     __ cmpptr(rdx_temp, rax_argslot);
twisti@2903:     __ jcc(Assembler::below, loop);
jrose@1145:   }
jrose@1145: 
jrose@1145:   // Now move the argslot down, to point to the opened-up space.
never@2895:   __ lea(rax_argslot, Address(rax_argslot, arg_slots, Interpreter::stackElementScale()));
jrose@2148:   BLOCK_COMMENT("} insert_arg_slots");
jrose@1145: }
jrose@1145: 
jrose@1145: // Helper to remove argument slots from the stack.
never@2895: // arg_slots must be a multiple of stack_move_unit() and > 0
jrose@1145: void MethodHandles::remove_arg_slots(MacroAssembler* _masm,
never@2895:                                      RegisterOrConstant arg_slots,
never@2895:                                      Register rax_argslot,
never@2895:                                      Register rbx_temp, Register rdx_temp) {
never@2895:   // allow constant zero
never@2895:   if (arg_slots.is_constant() && arg_slots.as_constant() == 0)
never@2895:     return;
jrose@1145:   assert_different_registers(rax_argslot, rbx_temp, rdx_temp,
jrose@1145:                              (!arg_slots.is_register() ? rsp : arg_slots.as_register()));
never@2895:   if (VerifyMethodHandles)
never@2895:     verify_argslots(_masm, arg_slots, rax_argslot, false,
never@2895:                     "deleted argument(s) must fall within current frame");
never@2895:   if (VerifyMethodHandles)
never@2895:     verify_stack_move(_masm, arg_slots, +1);
jrose@1145: 
jrose@2148:   BLOCK_COMMENT("remove_arg_slots {");
jrose@1145:   // Pull up everything shallower than rax_argslot.
jrose@1145:   // Then remove the excess space on the stack.
jrose@1145:   // The stacked return address gets pulled up with everything else.
jrose@1145:   // That is, copy [rsp, argslot) upward by size words.  In pseudo-code:
jrose@1145:   //   for (rdx = argslot-1; rdx >= rsp; --rdx)
jrose@1145:   //     rdx[size] = rdx[0]
jrose@1145:   //   argslot += size;
jrose@1145:   //   rsp += size;
jrose@1145:   __ lea(rdx_temp, Address(rax_argslot, -wordSize)); // source pointer for copy
jrose@1145:   {
jrose@1145:     Label loop;
jrose@2148:     __ BIND(loop);
jrose@1145:     // pull one word up each time through the loop
jrose@1145:     __ movptr(rbx_temp, Address(rdx_temp, 0));
never@2895:     __ movptr(Address(rdx_temp, arg_slots, Interpreter::stackElementScale()), rbx_temp);
jrose@1145:     __ addptr(rdx_temp, -wordSize);
jrose@1145:     __ cmpptr(rdx_temp, rsp);
twisti@2903:     __ jcc(Assembler::aboveEqual, loop);
jrose@1145:   }
jrose@1145: 
jrose@1145:   // Now move the argslot up, to point to the just-copied block.
never@2895:   __ lea(rsp, Address(rsp, arg_slots, Interpreter::stackElementScale()));
jrose@1145:   // And adjust the argslot address to point at the deletion point.
never@2895:   __ lea(rax_argslot, Address(rax_argslot, arg_slots, Interpreter::stackElementScale()));
jrose@2148:   BLOCK_COMMENT("} remove_arg_slots");
jrose@1145: }
jrose@1145: 
never@2895: // Helper to copy argument slots to the top of the stack.
never@2895: // The sequence starts with rax_argslot and is counted by slot_count
never@2895: // slot_count must be a multiple of stack_move_unit() and >= 0
never@2895: // This function blows the temps but does not change rax_argslot.
never@2895: void MethodHandles::push_arg_slots(MacroAssembler* _masm,
never@2895:                                    Register rax_argslot,
never@2895:                                    RegisterOrConstant slot_count,
never@2895:                                    int skip_words_count,
never@2895:                                    Register rbx_temp, Register rdx_temp) {
never@2895:   assert_different_registers(rax_argslot, rbx_temp, rdx_temp,
never@2895:                              (!slot_count.is_register() ? rbp : slot_count.as_register()),
never@2895:                              rsp);
never@2895:   assert(Interpreter::stackElementSize == wordSize, "else change this code");
never@2895: 
never@2895:   if (VerifyMethodHandles)
never@2895:     verify_stack_move(_masm, slot_count, 0);
never@2895: 
never@2895:   // allow constant zero
never@2895:   if (slot_count.is_constant() && slot_count.as_constant() == 0)
never@2895:     return;
never@2895: 
never@2895:   BLOCK_COMMENT("push_arg_slots {");
never@2895: 
never@2895:   Register rbx_top = rbx_temp;
never@2895: 
never@2895:   // There is at most 1 word to carry down with the TOS.
never@2895:   switch (skip_words_count) {
never@2895:   case 1: __ pop(rdx_temp); break;
never@2895:   case 0:                   break;
never@2895:   default: ShouldNotReachHere();
never@2895:   }
never@2895: 
never@2895:   if (slot_count.is_constant()) {
never@2895:     for (int i = slot_count.as_constant() - 1; i >= 0; i--) {
never@2895:       __ pushptr(Address(rax_argslot, i * wordSize));
never@2895:     }
never@2895:   } else {
never@2895:     Label L_plural, L_loop, L_break;
never@2895:     // Emit code to dynamically check for the common cases, zero and one slot.
never@2895:     __ cmpl(slot_count.as_register(), (int32_t) 1);
never@2895:     __ jccb(Assembler::greater, L_plural);
never@2895:     __ jccb(Assembler::less, L_break);
never@2895:     __ pushptr(Address(rax_argslot, 0));
never@2895:     __ jmpb(L_break);
never@2895:     __ BIND(L_plural);
never@2895: 
never@2895:     // Loop for 2 or more:
never@2895:     //   rbx = &rax[slot_count]
never@2895:     //   while (rbx > rax)  *(--rsp) = *(--rbx)
never@2895:     __ lea(rbx_top, Address(rax_argslot, slot_count, Address::times_ptr));
never@2895:     __ BIND(L_loop);
never@2895:     __ subptr(rbx_top, wordSize);
never@2895:     __ pushptr(Address(rbx_top, 0));
never@2895:     __ cmpptr(rbx_top, rax_argslot);
never@2895:     __ jcc(Assembler::above, L_loop);
never@2895:     __ bind(L_break);
never@2895:   }
never@2895:   switch (skip_words_count) {
never@2895:   case 1: __ push(rdx_temp); break;
never@2895:   case 0:                    break;
never@2895:   default: ShouldNotReachHere();
never@2895:   }
never@2895:   BLOCK_COMMENT("} push_arg_slots");
never@2895: }
never@2895: 
never@2895: // in-place movement; no change to rsp
never@2895: // blows rax_temp, rdx_temp
never@2895: void MethodHandles::move_arg_slots_up(MacroAssembler* _masm,
never@2895:                                       Register rbx_bottom,  // invariant
never@2895:                                       Address  top_addr,     // can use rax_temp
never@2895:                                       RegisterOrConstant positive_distance_in_slots,
never@2895:                                       Register rax_temp, Register rdx_temp) {
never@2895:   BLOCK_COMMENT("move_arg_slots_up {");
never@2895:   assert_different_registers(rbx_bottom,
never@2895:                              rax_temp, rdx_temp,
never@2895:                              positive_distance_in_slots.register_or_noreg());
never@2895:   Label L_loop, L_break;
never@2895:   Register rax_top = rax_temp;
never@2895:   if (!top_addr.is_same_address(Address(rax_top, 0)))
never@2895:     __ lea(rax_top, top_addr);
never@2895:   // Detect empty (or broken) loop:
never@2895: #ifdef ASSERT
never@2895:   if (VerifyMethodHandles) {
never@2895:     // Verify that &bottom < &top (non-empty interval)
never@2895:     Label L_ok, L_bad;
never@2895:     if (positive_distance_in_slots.is_register()) {
never@2895:       __ cmpptr(positive_distance_in_slots.as_register(), (int32_t) 0);
never@2895:       __ jcc(Assembler::lessEqual, L_bad);
never@2895:     }
never@2895:     __ cmpptr(rbx_bottom, rax_top);
never@2895:     __ jcc(Assembler::below, L_ok);
never@2895:     __ bind(L_bad);
never@2895:     __ stop("valid bounds (copy up)");
never@2895:     __ BIND(L_ok);
never@2895:   }
never@2895: #endif
never@2895:   __ cmpptr(rbx_bottom, rax_top);
never@2895:   __ jccb(Assembler::aboveEqual, L_break);
never@2895:   // work rax down to rbx, copying contiguous data upwards
never@2895:   // In pseudo-code:
never@2895:   //   [rbx, rax) = &[bottom, top)
never@2895:   //   while (--rax >= rbx) *(rax + distance) = *(rax + 0), rax--;
never@2895:   __ BIND(L_loop);
never@2895:   __ subptr(rax_top, wordSize);
never@2895:   __ movptr(rdx_temp, Address(rax_top, 0));
never@2895:   __ movptr(          Address(rax_top, positive_distance_in_slots, Address::times_ptr), rdx_temp);
never@2895:   __ cmpptr(rax_top, rbx_bottom);
never@2895:   __ jcc(Assembler::above, L_loop);
never@2895:   assert(Interpreter::stackElementSize == wordSize, "else change loop");
never@2895:   __ bind(L_break);
never@2895:   BLOCK_COMMENT("} move_arg_slots_up");
never@2895: }
never@2895: 
never@2895: // in-place movement; no change to rsp
never@2895: // blows rax_temp, rdx_temp
never@2895: void MethodHandles::move_arg_slots_down(MacroAssembler* _masm,
never@2895:                                         Address  bottom_addr,  // can use rax_temp
never@2895:                                         Register rbx_top,      // invariant
never@2895:                                         RegisterOrConstant negative_distance_in_slots,
never@2895:                                         Register rax_temp, Register rdx_temp) {
never@2895:   BLOCK_COMMENT("move_arg_slots_down {");
never@2895:   assert_different_registers(rbx_top,
never@2895:                              negative_distance_in_slots.register_or_noreg(),
never@2895:                              rax_temp, rdx_temp);
never@2895:   Label L_loop, L_break;
never@2895:   Register rax_bottom = rax_temp;
never@2895:   if (!bottom_addr.is_same_address(Address(rax_bottom, 0)))
never@2895:     __ lea(rax_bottom, bottom_addr);
never@2895:   // Detect empty (or broken) loop:
never@2895: #ifdef ASSERT
never@2895:   assert(!negative_distance_in_slots.is_constant() || negative_distance_in_slots.as_constant() < 0, "");
never@2895:   if (VerifyMethodHandles) {
never@2895:     // Verify that &bottom < &top (non-empty interval)
never@2895:     Label L_ok, L_bad;
never@2895:     if (negative_distance_in_slots.is_register()) {
never@2895:       __ cmpptr(negative_distance_in_slots.as_register(), (int32_t) 0);
never@2895:       __ jcc(Assembler::greaterEqual, L_bad);
never@2895:     }
never@2895:     __ cmpptr(rax_bottom, rbx_top);
never@2895:     __ jcc(Assembler::below, L_ok);
never@2895:     __ bind(L_bad);
never@2895:     __ stop("valid bounds (copy down)");
never@2895:     __ BIND(L_ok);
never@2895:   }
never@2895: #endif
never@2895:   __ cmpptr(rax_bottom, rbx_top);
never@2895:   __ jccb(Assembler::aboveEqual, L_break);
never@2895:   // work rax up to rbx, copying contiguous data downwards
never@2895:   // In pseudo-code:
never@2895:   //   [rax, rbx) = &[bottom, top)
never@2895:   //   while (rax < rbx) *(rax - distance) = *(rax + 0), rax++;
never@2895:   __ BIND(L_loop);
never@2895:   __ movptr(rdx_temp, Address(rax_bottom, 0));
never@2895:   __ movptr(          Address(rax_bottom, negative_distance_in_slots, Address::times_ptr), rdx_temp);
never@2895:   __ addptr(rax_bottom, wordSize);
never@2895:   __ cmpptr(rax_bottom, rbx_top);
never@2895:   __ jcc(Assembler::below, L_loop);
never@2895:   assert(Interpreter::stackElementSize == wordSize, "else change loop");
never@2895:   __ bind(L_break);
never@2895:   BLOCK_COMMENT("} move_arg_slots_down");
never@2895: }
never@2895: 
never@2895: // Copy from a field or array element to a stacked argument slot.
never@2895: // is_element (ignored) says whether caller is loading an array element instead of an instance field.
never@2895: void MethodHandles::move_typed_arg(MacroAssembler* _masm,
never@2895:                                    BasicType type, bool is_element,
never@2895:                                    Address slot_dest, Address value_src,
never@2895:                                    Register rbx_temp, Register rdx_temp) {
never@2895:   BLOCK_COMMENT(!is_element ? "move_typed_arg {" : "move_typed_arg { (array element)");
never@2895:   if (type == T_OBJECT || type == T_ARRAY) {
never@2895:     __ load_heap_oop(rbx_temp, value_src);
never@2895:     __ movptr(slot_dest, rbx_temp);
never@2895:   } else if (type != T_VOID) {
never@2895:     int  arg_size      = type2aelembytes(type);
never@2895:     bool arg_is_signed = is_signed_subword_type(type);
never@2895:     int  slot_size     = (arg_size > wordSize) ? arg_size : wordSize;
never@2895:     __ load_sized_value(  rdx_temp,  value_src, arg_size, arg_is_signed, rbx_temp);
never@2895:     __ store_sized_value( slot_dest, rdx_temp,  slot_size,               rbx_temp);
never@2895:   }
never@2895:   BLOCK_COMMENT("} move_typed_arg");
never@2895: }
never@2895: 
never@2895: void MethodHandles::move_return_value(MacroAssembler* _masm, BasicType type,
never@2895:                                       Address return_slot) {
never@2895:   BLOCK_COMMENT("move_return_value {");
never@2895:   // Old versions of the JVM must clean the FPU stack after every return.
never@2895: #ifndef _LP64
never@2895: #ifdef COMPILER2
never@2895:   // The FPU stack is clean if UseSSE >= 2 but must be cleaned in other cases
never@2895:   if ((type == T_FLOAT && UseSSE < 1) || (type == T_DOUBLE && UseSSE < 2)) {
never@2895:     for (int i = 1; i < 8; i++) {
never@2895:         __ ffree(i);
never@2895:     }
never@2895:   } else if (UseSSE < 2) {
never@2895:     __ empty_FPU_stack();
never@2895:   }
never@2895: #endif //COMPILER2
never@2895: #endif //!_LP64
never@2895: 
never@2895:   // Look at the type and pull the value out of the corresponding register.
never@2895:   if (type == T_VOID) {
never@2895:     // nothing to do
never@2895:   } else if (type == T_OBJECT) {
never@2895:     __ movptr(return_slot, rax);
never@2895:   } else if (type == T_INT || is_subword_type(type)) {
never@2895:     // write the whole word, even if only 32 bits is significant
never@2895:     __ movptr(return_slot, rax);
never@2895:   } else if (type == T_LONG) {
never@2895:     // store the value by parts
never@2895:     // Note: We assume longs are continguous (if misaligned) on the interpreter stack.
never@2895:     __ store_sized_value(return_slot, rax, BytesPerLong, rdx);
never@2895:   } else if (NOT_LP64((type == T_FLOAT  && UseSSE < 1) ||
never@2895:                       (type == T_DOUBLE && UseSSE < 2) ||)
never@2895:              false) {
never@2895:     // Use old x86 FPU registers:
never@2895:     if (type == T_FLOAT)
never@2895:       __ fstp_s(return_slot);
never@2895:     else
never@2895:       __ fstp_d(return_slot);
never@2895:   } else if (type == T_FLOAT) {
never@2895:     __ movflt(return_slot, xmm0);
never@2895:   } else if (type == T_DOUBLE) {
never@2895:     __ movdbl(return_slot, xmm0);
never@2895:   } else {
never@2895:     ShouldNotReachHere();
never@2895:   }
never@2895:   BLOCK_COMMENT("} move_return_value");
never@2895: }
never@2895: 
never@2895: 
jrose@1145: #ifndef PRODUCT
twisti@1568: extern "C" void print_method_handle(oop mh);
jrose@1145: void trace_method_handle_stub(const char* adaptername,
never@2895:                               oop mh,
never@2895:                               intptr_t* saved_regs,
never@2895:                               intptr_t* entry_sp,
never@2868:                               intptr_t* saved_sp,
never@2895:                               intptr_t* saved_bp) {
jrose@1145:   // called as a leaf from native code: do not block the JVM!
twisti@2903:   bool has_mh = (strstr(adaptername, "return/") == NULL);  // return adapters don't have rcx_mh
never@2895:   intptr_t* last_sp = (intptr_t*) saved_bp[frame::interpreter_frame_last_sp_offset];
twisti@2903:   intptr_t* base_sp = last_sp;
twisti@2903:   typedef MethodHandles::RicochetFrame RicochetFrame;
twisti@2903:   RicochetFrame* rfp = (RicochetFrame*)((address)saved_bp - RicochetFrame::sender_link_offset_in_bytes());
twisti@2903:   if (!UseRicochetFrames || Universe::heap()->is_in((address) rfp->saved_args_base())) {
twisti@2903:     // Probably an interpreter frame.
twisti@2903:     base_sp = (intptr_t*) saved_bp[frame::interpreter_frame_monitor_block_top_offset];
twisti@2903:   }
twisti@2903:   intptr_t    mh_reg = (intptr_t)mh;
twisti@2903:   const char* mh_reg_name = "rcx_mh";
twisti@2903:   if (!has_mh)  mh_reg_name = "rcx";
twisti@2903:   tty->print_cr("MH %s %s="PTR_FORMAT" sp=("PTR_FORMAT"+"INTX_FORMAT") stack_size="INTX_FORMAT" bp="PTR_FORMAT,
twisti@2903:                 adaptername, mh_reg_name, mh_reg,
twisti@2903:                 (intptr_t)entry_sp, (intptr_t)(saved_sp - entry_sp), (intptr_t)(base_sp - last_sp), (intptr_t)saved_bp);
jrose@2148:   if (Verbose) {
never@2895:     tty->print(" reg dump: ");
never@2895:     int saved_regs_count = (entry_sp-1) - saved_regs;
never@2895:     // 32 bit: rdi rsi rbp rsp; rbx rdx rcx (*) rax
never@2895:     int i;
never@2895:     for (i = 0; i <= saved_regs_count; i++) {
never@2895:       if (i > 0 && i % 4 == 0 && i != saved_regs_count) {
never@2895:         tty->cr();
never@2895:         tty->print("   + dump: ");
never@2895:       }
twisti@2903:       tty->print(" %d: "PTR_FORMAT, i, saved_regs[i]);
never@2895:     }
never@2895:     tty->cr();
twisti@2903:     if (last_sp != saved_sp && last_sp != NULL)
twisti@2903:       tty->print_cr("*** last_sp="PTR_FORMAT, (intptr_t)last_sp);
never@2895:     int stack_dump_count = 16;
never@2895:     if (stack_dump_count < (int)(saved_bp + 2 - saved_sp))
never@2895:       stack_dump_count = (int)(saved_bp + 2 - saved_sp);
never@2895:     if (stack_dump_count > 64)  stack_dump_count = 48;
never@2895:     for (i = 0; i < stack_dump_count; i += 4) {
twisti@2903:       tty->print_cr(" dump at SP[%d] "PTR_FORMAT": "PTR_FORMAT" "PTR_FORMAT" "PTR_FORMAT" "PTR_FORMAT,
never@2895:                     i, (intptr_t) &entry_sp[i+0], entry_sp[i+0], entry_sp[i+1], entry_sp[i+2], entry_sp[i+3]);
never@2895:     }
twisti@2903:     if (has_mh)
twisti@2903:       print_method_handle(mh);
jrose@2148:   }
jrose@2148: }
never@2895: 
never@2895: // The stub wraps the arguments in a struct on the stack to avoid
never@2895: // dealing with the different calling conventions for passing 6
never@2895: // arguments.
never@2895: struct MethodHandleStubArguments {
never@2895:   const char* adaptername;
never@2895:   oopDesc* mh;
never@2895:   intptr_t* saved_regs;
never@2895:   intptr_t* entry_sp;
never@2895:   intptr_t* saved_sp;
never@2895:   intptr_t* saved_bp;
never@2895: };
never@2895: void trace_method_handle_stub_wrapper(MethodHandleStubArguments* args) {
never@2895:   trace_method_handle_stub(args->adaptername,
never@2895:                            args->mh,
never@2895:                            args->saved_regs,
never@2895:                            args->entry_sp,
never@2895:                            args->saved_sp,
never@2895:                            args->saved_bp);
never@2895: }
never@2895: 
jrose@2148: void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) {
jrose@2148:   if (!TraceMethodHandles)  return;
jrose@2148:   BLOCK_COMMENT("trace_method_handle {");
never@2895:   __ push(rax);
never@2895:   __ lea(rax, Address(rsp, wordSize * NOT_LP64(6) LP64_ONLY(14))); // entry_sp  __ pusha();
jrose@2148:   __ pusha();
never@2895:   __ mov(rbx, rsp);
never@2895:   __ enter();
never@2895:   // incoming state:
never@2868:   // rcx: method handle
never@2895:   // r13 or rsi: saved sp
never@2895:   // To avoid calling convention issues, build a record on the stack and pass the pointer to that instead.
never@2895:   __ push(rbp);               // saved_bp
never@2895:   __ push(rsi);               // saved_sp
never@2895:   __ push(rax);               // entry_sp
never@2895:   __ push(rbx);               // pusha saved_regs
never@2895:   __ push(rcx);               // mh
never@2895:   __ push(rcx);               // adaptername
never@2895:   __ movptr(Address(rsp, 0), (intptr_t) adaptername);
never@2895:   __ super_call_VM_leaf(CAST_FROM_FN_PTR(address, trace_method_handle_stub_wrapper), rsp);
never@2895:   __ leave();
jrose@2148:   __ popa();
never@2895:   __ pop(rax);
jrose@2148:   BLOCK_COMMENT("} trace_method_handle");
jrose@1145: }
jrose@1145: #endif //PRODUCT
jrose@1145: 
jrose@1862: // which conversion op types are implemented here?
jrose@1862: int MethodHandles::adapter_conversion_ops_supported_mask() {
jrose@2639:   return ((1<<java_lang_invoke_AdapterMethodHandle::OP_RETYPE_ONLY)
jrose@2639:          |(1<<java_lang_invoke_AdapterMethodHandle::OP_RETYPE_RAW)
jrose@2639:          |(1<<java_lang_invoke_AdapterMethodHandle::OP_CHECK_CAST)
jrose@2639:          |(1<<java_lang_invoke_AdapterMethodHandle::OP_PRIM_TO_PRIM)
jrose@2639:          |(1<<java_lang_invoke_AdapterMethodHandle::OP_REF_TO_PRIM)
never@2895:           //OP_PRIM_TO_REF is below...
jrose@2639:          |(1<<java_lang_invoke_AdapterMethodHandle::OP_SWAP_ARGS)
jrose@2639:          |(1<<java_lang_invoke_AdapterMethodHandle::OP_ROT_ARGS)
jrose@2639:          |(1<<java_lang_invoke_AdapterMethodHandle::OP_DUP_ARGS)
jrose@2639:          |(1<<java_lang_invoke_AdapterMethodHandle::OP_DROP_ARGS)
never@2895:           //OP_COLLECT_ARGS is below...
never@2895:          |(1<<java_lang_invoke_AdapterMethodHandle::OP_SPREAD_ARGS)
never@2895:          |(!UseRicochetFrames ? 0 :
never@2895:            java_lang_invoke_MethodTypeForm::vmlayout_offset_in_bytes() <= 0 ? 0 :
never@2895:            ((1<<java_lang_invoke_AdapterMethodHandle::OP_PRIM_TO_REF)
never@2895:            |(1<<java_lang_invoke_AdapterMethodHandle::OP_COLLECT_ARGS)
never@2895:            |(1<<java_lang_invoke_AdapterMethodHandle::OP_FOLD_ARGS)
never@2895:             ))
jrose@1862:          );
jrose@1862: }
jrose@1862: 
twisti@2411: //------------------------------------------------------------------------------
twisti@2411: // MethodHandles::generate_method_handle_stub
twisti@2411: //
jrose@1145: // Generate an "entry" field for a method handle.
jrose@1145: // This determines how the method handle will respond to calls.
twisti@2436: void MethodHandles::generate_method_handle_stub(MacroAssembler* _masm, MethodHandles::EntryKind ek) {
never@2895:   MethodHandles::EntryKind ek_orig = ek_original_kind(ek);
never@2895: 
jrose@1145:   // Here is the register state during an interpreted call,
jrose@1145:   // as set up by generate_method_handle_interpreter_entry():
jrose@1145:   // - rbx: garbage temp (was MethodHandle.invoke methodOop, unused)
jrose@1145:   // - rcx: receiver method handle
jrose@1145:   // - rax: method handle type (only used by the check_mtype entry point)
jrose@1145:   // - rsi/r13: sender SP (must preserve; see prepare_to_jump_from_interpreted)
jrose@1145:   // - rdx: garbage temp, can blow away
jrose@1145: 
twisti@2411:   const Register rcx_recv    = rcx;
twisti@2411:   const Register rax_argslot = rax;
twisti@2411:   const Register rbx_temp    = rbx;
twisti@2411:   const Register rdx_temp    = rdx;
never@2895:   const Register rdi_temp    = rdi;
jrose@1145: 
jrose@1474:   // This guy is set up by prepare_to_jump_from_interpreted (from interpreted calls)
jrose@1474:   // and gen_c2i_adapter (from compiled calls):
never@2895:   const Register saved_last_sp = saved_last_sp_register();
twisti@2411: 
twisti@2411:   // Argument registers for _raise_exception.
twisti@2411:   // 32-bit: Pass first two oop/int args in registers ECX and EDX.
twisti@2411:   const Register rarg0_code     = LP64_ONLY(j_rarg0) NOT_LP64(rcx);
twisti@2411:   const Register rarg1_actual   = LP64_ONLY(j_rarg1) NOT_LP64(rdx);
twisti@2411:   const Register rarg2_required = LP64_ONLY(j_rarg2) NOT_LP64(rdi);
twisti@2411:   assert_different_registers(rarg0_code, rarg1_actual, rarg2_required, saved_last_sp);
jrose@1474: 
jrose@2639:   guarantee(java_lang_invoke_MethodHandle::vmentry_offset_in_bytes() != 0, "must have offsets");
jrose@1145: 
jrose@1145:   // some handy addresses
jrose@1145:   Address rbx_method_fie(     rbx,      methodOopDesc::from_interpreted_offset() );
twisti@2603:   Address rbx_method_fce(     rbx,      methodOopDesc::from_compiled_offset() );
jrose@1145: 
jrose@2639:   Address rcx_mh_vmtarget(    rcx_recv, java_lang_invoke_MethodHandle::vmtarget_offset_in_bytes() );
jrose@2639:   Address rcx_dmh_vmindex(    rcx_recv, java_lang_invoke_DirectMethodHandle::vmindex_offset_in_bytes() );
jrose@1145: 
jrose@2639:   Address rcx_bmh_vmargslot(  rcx_recv, java_lang_invoke_BoundMethodHandle::vmargslot_offset_in_bytes() );
jrose@2639:   Address rcx_bmh_argument(   rcx_recv, java_lang_invoke_BoundMethodHandle::argument_offset_in_bytes() );
jrose@1145: 
jrose@2639:   Address rcx_amh_vmargslot(  rcx_recv, java_lang_invoke_AdapterMethodHandle::vmargslot_offset_in_bytes() );
jrose@2639:   Address rcx_amh_argument(   rcx_recv, java_lang_invoke_AdapterMethodHandle::argument_offset_in_bytes() );
jrose@2639:   Address rcx_amh_conversion( rcx_recv, java_lang_invoke_AdapterMethodHandle::conversion_offset_in_bytes() );
jrose@1145:   Address vmarg;                // __ argument_address(vmargslot)
jrose@1145: 
jrose@1474:   const int java_mirror_offset = klassOopDesc::klass_part_offset_in_bytes() + Klass::java_mirror_offset_in_bytes();
jrose@1474: 
jrose@1145:   if (have_entry(ek)) {
jrose@1145:     __ nop();                   // empty stubs make SG sick
jrose@1145:     return;
jrose@1145:   }
jrose@1145: 
never@2895: #ifdef ASSERT
never@2895:   __ push((int32_t) 0xEEEEEEEE);
never@2895:   __ push((int32_t) (intptr_t) entry_name(ek));
never@2895:   LP64_ONLY(__ push((int32_t) high((intptr_t) entry_name(ek))));
never@2895:   __ push((int32_t) 0x33333333);
never@2895: #endif //ASSERT
never@2895: 
jrose@1145:   address interp_entry = __ pc();
jrose@1145: 
jrose@2148:   trace_method_handle(_masm, entry_name(ek));
jrose@2148: 
jrose@2148:   BLOCK_COMMENT(entry_name(ek));
jrose@1145: 
jrose@1145:   switch ((int) ek) {
jrose@1474:   case _raise_exception:
jrose@1145:     {
twisti@2411:       // Not a real MH entry, but rather shared code for raising an
twisti@2603:       // exception.  Since we use the compiled entry, arguments are
twisti@2603:       // expected in compiler argument registers.
twisti@2436:       assert(raise_exception_method(), "must be set");
twisti@2603:       assert(raise_exception_method()->from_compiled_entry(), "method must be linked");
jrose@1145: 
twisti@2411:       const Register rdi_pc = rax;
twisti@2411:       __ pop(rdi_pc);  // caller PC
twisti@2411:       __ mov(rsp, saved_last_sp);  // cut the stack back to where the caller started
jrose@1145: 
jrose@1474:       Register rbx_method = rbx_temp;
twisti@2411:       Label L_no_method;
jrose@2639:       // FIXME: fill in _raise_exception_method with a suitable java.lang.invoke method
jrose@1474:       __ movptr(rbx_method, ExternalAddress((address) &_raise_exception_method));
jrose@1474:       __ testptr(rbx_method, rbx_method);
twisti@2411:       __ jccb(Assembler::zero, L_no_method);
twisti@2411: 
twisti@2411:       const int jobject_oop_offset = 0;
jrose@1474:       __ movptr(rbx_method, Address(rbx_method, jobject_oop_offset));  // dereference the jobject
jrose@1474:       __ testptr(rbx_method, rbx_method);
twisti@2411:       __ jccb(Assembler::zero, L_no_method);
jrose@1474:       __ verify_oop(rbx_method);
twisti@2411: 
twisti@2411:       NOT_LP64(__ push(rarg2_required));
twisti@2603:       __ push(rdi_pc);         // restore caller PC
twisti@2603:       __ jmp(rbx_method_fce);  // jump to compiled entry
twisti@2411: 
jrose@1474:       // Do something that is at least causes a valid throw from the interpreter.
twisti@2411:       __ bind(L_no_method);
twisti@2411:       __ push(rarg2_required);
twisti@2411:       __ push(rarg1_actual);
jrose@1145:       __ jump(ExternalAddress(Interpreter::throw_WrongMethodType_entry()));
jrose@1145:     }
jrose@1145:     break;
jrose@1145: 
jrose@1145:   case _invokestatic_mh:
jrose@1145:   case _invokespecial_mh:
jrose@1145:     {
jrose@1145:       Register rbx_method = rbx_temp;
twisti@2201:       __ load_heap_oop(rbx_method, rcx_mh_vmtarget); // target is a methodOop
jrose@1145:       __ verify_oop(rbx_method);
jrose@1145:       // same as TemplateTable::invokestatic or invokespecial,
jrose@1145:       // minus the CP setup and profiling:
jrose@1145:       if (ek == _invokespecial_mh) {
jrose@1145:         // Must load & check the first argument before entering the target method.
jrose@1145:         __ load_method_handle_vmslots(rax_argslot, rcx_recv, rdx_temp);
jrose@1145:         __ movptr(rcx_recv, __ argument_address(rax_argslot, -1));
jrose@1145:         __ null_check(rcx_recv);
jrose@1145:         __ verify_oop(rcx_recv);
jrose@1145:       }
jrose@1145:       __ jmp(rbx_method_fie);
jrose@1145:     }
jrose@1145:     break;
jrose@1145: 
jrose@1145:   case _invokevirtual_mh:
jrose@1145:     {
jrose@1145:       // same as TemplateTable::invokevirtual,
jrose@1145:       // minus the CP setup and profiling:
jrose@1145: 
jrose@1145:       // pick out the vtable index and receiver offset from the MH,
jrose@1145:       // and then we can discard it:
jrose@1145:       __ load_method_handle_vmslots(rax_argslot, rcx_recv, rdx_temp);
jrose@1145:       Register rbx_index = rbx_temp;
jrose@1145:       __ movl(rbx_index, rcx_dmh_vmindex);
jrose@1145:       // Note:  The verifier allows us to ignore rcx_mh_vmtarget.
jrose@1145:       __ movptr(rcx_recv, __ argument_address(rax_argslot, -1));
jrose@1145:       __ null_check(rcx_recv, oopDesc::klass_offset_in_bytes());
jrose@1145: 
jrose@1145:       // get receiver klass
jrose@1145:       Register rax_klass = rax_argslot;
jrose@1145:       __ load_klass(rax_klass, rcx_recv);
jrose@1145:       __ verify_oop(rax_klass);
jrose@1145: 
jrose@1145:       // get target methodOop & entry point
jrose@1145:       const int base = instanceKlass::vtable_start_offset() * wordSize;
jrose@1145:       assert(vtableEntry::size() * wordSize == wordSize, "adjust the scaling in the code below");
jrose@1145:       Address vtable_entry_addr(rax_klass,
jrose@1145:                                 rbx_index, Address::times_ptr,
jrose@1145:                                 base + vtableEntry::method_offset_in_bytes());
jrose@1145:       Register rbx_method = rbx_temp;
twisti@1543:       __ movptr(rbx_method, vtable_entry_addr);
jrose@1145: 
jrose@1145:       __ verify_oop(rbx_method);
jrose@1145:       __ jmp(rbx_method_fie);
jrose@1145:     }
jrose@1145:     break;
jrose@1145: 
jrose@1145:   case _invokeinterface_mh:
jrose@1145:     {
jrose@1145:       // same as TemplateTable::invokeinterface,
jrose@1145:       // minus the CP setup and profiling:
jrose@1145: 
jrose@1145:       // pick out the interface and itable index from the MH.
jrose@1145:       __ load_method_handle_vmslots(rax_argslot, rcx_recv, rdx_temp);
jrose@1145:       Register rdx_intf  = rdx_temp;
jrose@1145:       Register rbx_index = rbx_temp;
twisti@2201:       __ load_heap_oop(rdx_intf, rcx_mh_vmtarget);
twisti@2201:       __ movl(rbx_index, rcx_dmh_vmindex);
jrose@1145:       __ movptr(rcx_recv, __ argument_address(rax_argslot, -1));
jrose@1145:       __ null_check(rcx_recv, oopDesc::klass_offset_in_bytes());
jrose@1145: 
jrose@1145:       // get receiver klass
jrose@1145:       Register rax_klass = rax_argslot;
jrose@1145:       __ load_klass(rax_klass, rcx_recv);
jrose@1145:       __ verify_oop(rax_klass);
jrose@1145: 
jrose@1145:       Register rbx_method = rbx_index;
jrose@1145: 
jrose@1145:       // get interface klass
jrose@1145:       Label no_such_interface;
jrose@1145:       __ verify_oop(rdx_intf);
jrose@1145:       __ lookup_interface_method(rax_klass, rdx_intf,
jrose@1145:                                  // note: next two args must be the same:
jrose@1145:                                  rbx_index, rbx_method,
jrose@1474:                                  rdi_temp,
jrose@1145:                                  no_such_interface);
jrose@1145: 
jrose@1145:       __ verify_oop(rbx_method);
jrose@1145:       __ jmp(rbx_method_fie);
jrose@1145:       __ hlt();
jrose@1145: 
jrose@1145:       __ bind(no_such_interface);
jrose@1145:       // Throw an exception.
jrose@1145:       // For historical reasons, it will be IncompatibleClassChangeError.
twisti@2411:       __ mov(rbx_temp, rcx_recv);  // rarg2_required might be RCX
twisti@2411:       assert_different_registers(rarg2_required, rbx_temp);
twisti@2411:       __ movptr(rarg2_required, Address(rdx_intf, java_mirror_offset));  // required interface
twisti@2411:       __ mov(   rarg1_actual,   rbx_temp);                               // bad receiver
twisti@2411:       __ movl(  rarg0_code,     (int) Bytecodes::_invokeinterface);      // who is complaining?
jrose@1474:       __ jump(ExternalAddress(from_interpreted_entry(_raise_exception)));
jrose@1145:     }
jrose@1145:     break;
jrose@1145: 
jrose@1145:   case _bound_ref_mh:
jrose@1145:   case _bound_int_mh:
jrose@1145:   case _bound_long_mh:
jrose@1145:   case _bound_ref_direct_mh:
jrose@1145:   case _bound_int_direct_mh:
jrose@1145:   case _bound_long_direct_mh:
jrose@1145:     {
jrose@1145:       bool direct_to_method = (ek >= _bound_ref_direct_mh);
never@2895:       BasicType arg_type  = ek_bound_mh_arg_type(ek);
never@2895:       int       arg_slots = type2size[arg_type];
jrose@1145: 
jrose@1145:       // make room for the new argument:
jrose@1145:       __ movl(rax_argslot, rcx_bmh_vmargslot);
jrose@1145:       __ lea(rax_argslot, __ argument_address(rax_argslot));
twisti@2565: 
never@2895:       insert_arg_slots(_masm, arg_slots * stack_move_unit(), rax_argslot, rbx_temp, rdx_temp);
jrose@1145: 
jrose@1145:       // store bound argument into the new stack slot:
twisti@2201:       __ load_heap_oop(rbx_temp, rcx_bmh_argument);
jrose@1145:       if (arg_type == T_OBJECT) {
jrose@1145:         __ movptr(Address(rax_argslot, 0), rbx_temp);
jrose@1145:       } else {
twisti@2565:         Address prim_value_addr(rbx_temp, java_lang_boxing_object::value_offset_in_bytes(arg_type));
never@2895:         move_typed_arg(_masm, arg_type, false,
never@2895:                        Address(rax_argslot, 0),
never@2895:                        prim_value_addr,
never@2895:                        rbx_temp, rdx_temp);
jrose@1145:       }
jrose@1145: 
jrose@1145:       if (direct_to_method) {
jrose@1145:         Register rbx_method = rbx_temp;
twisti@2201:         __ load_heap_oop(rbx_method, rcx_mh_vmtarget);
jrose@1145:         __ verify_oop(rbx_method);
jrose@1145:         __ jmp(rbx_method_fie);
jrose@1145:       } else {
twisti@2201:         __ load_heap_oop(rcx_recv, rcx_mh_vmtarget);
jrose@1145:         __ verify_oop(rcx_recv);
jrose@1145:         __ jump_to_method_handle_entry(rcx_recv, rdx_temp);
jrose@1145:       }
jrose@1145:     }
jrose@1145:     break;
jrose@1145: 
jrose@1145:   case _adapter_retype_only:
jrose@1474:   case _adapter_retype_raw:
jrose@1145:     // immediately jump to the next MH layer:
twisti@2201:     __ load_heap_oop(rcx_recv, rcx_mh_vmtarget);
jrose@1145:     __ verify_oop(rcx_recv);
jrose@1145:     __ jump_to_method_handle_entry(rcx_recv, rdx_temp);
jrose@1145:     // This is OK when all parameter types widen.
jrose@1145:     // It is also OK when a return type narrows.
jrose@1145:     break;
jrose@1145: 
jrose@1145:   case _adapter_check_cast:
jrose@1145:     {
jrose@1145:       // temps:
jrose@1145:       Register rbx_klass = rbx_temp; // interesting AMH data
jrose@1145: 
jrose@1145:       // check a reference argument before jumping to the next layer of MH:
jrose@1145:       __ movl(rax_argslot, rcx_amh_vmargslot);
jrose@1145:       vmarg = __ argument_address(rax_argslot);
jrose@1145: 
jrose@1145:       // What class are we casting to?
twisti@2201:       __ load_heap_oop(rbx_klass, rcx_amh_argument); // this is a Class object!
never@2895:       load_klass_from_Class(_masm, rbx_klass);
jrose@1145: 
jrose@1145:       Label done;
jrose@1145:       __ movptr(rdx_temp, vmarg);
twisti@1712:       __ testptr(rdx_temp, rdx_temp);
twisti@2201:       __ jcc(Assembler::zero, done);         // no cast if null
jrose@1145:       __ load_klass(rdx_temp, rdx_temp);
jrose@1145: 
jrose@1145:       // live at this point:
jrose@1145:       // - rbx_klass:  klass required by the target method
jrose@1145:       // - rdx_temp:   argument klass to test
jrose@1474:       // - rcx_recv:   adapter method handle
jrose@1145:       __ check_klass_subtype(rdx_temp, rbx_klass, rax_argslot, done);
jrose@1145: 
jrose@1145:       // If we get here, the type check failed!
jrose@1145:       // Call the wrong_method_type stub, passing the failing argument type in rax.
jrose@1145:       Register rax_mtype = rax_argslot;
jrose@1474:       __ movl(rax_argslot, rcx_amh_vmargslot);  // reload argslot field
jrose@1474:       __ movptr(rdx_temp, vmarg);
jrose@1474: 
twisti@2411:       assert_different_registers(rarg2_required, rdx_temp);
twisti@2411:       __ load_heap_oop(rarg2_required, rcx_amh_argument);             // required class
twisti@2411:       __ mov(          rarg1_actual,   rdx_temp);                     // bad object
twisti@2411:       __ movl(         rarg0_code,     (int) Bytecodes::_checkcast);  // who is complaining?
jrose@1474:       __ jump(ExternalAddress(from_interpreted_entry(_raise_exception)));
jrose@1145: 
jrose@1145:       __ bind(done);
jrose@1474:       // get the new MH:
twisti@2201:       __ load_heap_oop(rcx_recv, rcx_mh_vmtarget);
jrose@1145:       __ jump_to_method_handle_entry(rcx_recv, rdx_temp);
jrose@1145:     }
jrose@1145:     break;
jrose@1145: 
jrose@1145:   case _adapter_prim_to_prim:
jrose@1145:   case _adapter_ref_to_prim:
never@2895:   case _adapter_prim_to_ref:
jrose@1145:     // handled completely by optimized cases
jrose@1145:     __ stop("init_AdapterMethodHandle should not issue this");
jrose@1145:     break;
jrose@1145: 
jrose@1145:   case _adapter_opt_i2i:        // optimized subcase of adapt_prim_to_prim
jrose@1145: //case _adapter_opt_f2i:        // optimized subcase of adapt_prim_to_prim
jrose@1145:   case _adapter_opt_l2i:        // optimized subcase of adapt_prim_to_prim
jrose@1145:   case _adapter_opt_unboxi:     // optimized subcase of adapt_ref_to_prim
jrose@1145:     {
jrose@1145:       // perform an in-place conversion to int or an int subword
jrose@1145:       __ movl(rax_argslot, rcx_amh_vmargslot);
jrose@1145:       vmarg = __ argument_address(rax_argslot);
jrose@1145: 
jrose@1145:       switch (ek) {
jrose@1145:       case _adapter_opt_i2i:
jrose@1145:         __ movl(rdx_temp, vmarg);
jrose@1145:         break;
jrose@1145:       case _adapter_opt_l2i:
jrose@1145:         {
jrose@1145:           // just delete the extra slot; on a little-endian machine we keep the first
jrose@1145:           __ lea(rax_argslot, __ argument_address(rax_argslot, 1));
jrose@1145:           remove_arg_slots(_masm, -stack_move_unit(),
jrose@1145:                            rax_argslot, rbx_temp, rdx_temp);
twisti@1861:           vmarg = Address(rax_argslot, -Interpreter::stackElementSize);
jrose@1145:           __ movl(rdx_temp, vmarg);
jrose@1145:         }
jrose@1145:         break;
jrose@1145:       case _adapter_opt_unboxi:
jrose@1145:         {
jrose@1145:           // Load the value up from the heap.
jrose@1145:           __ movptr(rdx_temp, vmarg);
jrose@1145:           int value_offset = java_lang_boxing_object::value_offset_in_bytes(T_INT);
jrose@1145: #ifdef ASSERT
jrose@1145:           for (int bt = T_BOOLEAN; bt < T_INT; bt++) {
jrose@1145:             if (is_subword_type(BasicType(bt)))
jrose@1145:               assert(value_offset == java_lang_boxing_object::value_offset_in_bytes(BasicType(bt)), "");
jrose@1145:           }
jrose@1145: #endif
jrose@1145:           __ null_check(rdx_temp, value_offset);
jrose@1145:           __ movl(rdx_temp, Address(rdx_temp, value_offset));
jrose@1145:           // We load this as a word.  Because we are little-endian,
jrose@1145:           // the low bits will be correct, but the high bits may need cleaning.
jrose@1145:           // The vminfo will guide us to clean those bits.
jrose@1145:         }
jrose@1145:         break;
jrose@1145:       default:
twisti@1739:         ShouldNotReachHere();
jrose@1145:       }
jrose@1145: 
twisti@1739:       // Do the requested conversion and store the value.
jrose@1145:       Register rbx_vminfo = rbx_temp;
never@2895:       load_conversion_vminfo(_masm, rbx_vminfo, rcx_amh_conversion);
jrose@1145: 
jrose@1145:       // get the new MH:
twisti@2201:       __ load_heap_oop(rcx_recv, rcx_mh_vmtarget);
jrose@1145:       // (now we are done with the old MH)
jrose@1145: 
jrose@1145:       // original 32-bit vmdata word must be of this form:
twisti@1570:       //    | MBZ:6 | signBitCount:8 | srcDstTypes:8 | conversionOp:8 |
twisti@1570:       __ xchgptr(rcx, rbx_vminfo);                // free rcx for shifts
jrose@1145:       __ shll(rdx_temp /*, rcx*/);
jrose@1145:       Label zero_extend, done;
jrose@1145:       __ testl(rcx, CONV_VMINFO_SIGN_FLAG);
twisti@1570:       __ jccb(Assembler::zero, zero_extend);
jrose@1145: 
jrose@1145:       // this path is taken for int->byte, int->short
jrose@1145:       __ sarl(rdx_temp /*, rcx*/);
twisti@1570:       __ jmpb(done);
jrose@1145: 
jrose@1145:       __ bind(zero_extend);
jrose@1145:       // this is taken for int->char
jrose@1145:       __ shrl(rdx_temp /*, rcx*/);
jrose@1145: 
jrose@1145:       __ bind(done);
twisti@1739:       __ movl(vmarg, rdx_temp);  // Store the value.
twisti@1570:       __ xchgptr(rcx, rbx_vminfo);                // restore rcx_recv
jrose@1145: 
jrose@1145:       __ jump_to_method_handle_entry(rcx_recv, rdx_temp);
jrose@1145:     }
jrose@1145:     break;
jrose@1145: 
jrose@1145:   case _adapter_opt_i2l:        // optimized subcase of adapt_prim_to_prim
jrose@1145:   case _adapter_opt_unboxl:     // optimized subcase of adapt_ref_to_prim
jrose@1145:     {
jrose@1145:       // perform an in-place int-to-long or ref-to-long conversion
jrose@1145:       __ movl(rax_argslot, rcx_amh_vmargslot);
jrose@1145: 
jrose@1145:       // on a little-endian machine we keep the first slot and add another after
jrose@1145:       __ lea(rax_argslot, __ argument_address(rax_argslot, 1));
never@2895:       insert_arg_slots(_masm, stack_move_unit(),
jrose@1145:                        rax_argslot, rbx_temp, rdx_temp);
twisti@1861:       Address vmarg1(rax_argslot, -Interpreter::stackElementSize);
twisti@1861:       Address vmarg2 = vmarg1.plus_disp(Interpreter::stackElementSize);
jrose@1145: 
jrose@1145:       switch (ek) {
jrose@1145:       case _adapter_opt_i2l:
jrose@1145:         {
twisti@1728: #ifdef _LP64
twisti@1728:           __ movslq(rdx_temp, vmarg1);  // Load sign-extended
twisti@1728:           __ movq(vmarg1, rdx_temp);    // Store into first slot
twisti@1728: #else
jrose@1145:           __ movl(rdx_temp, vmarg1);
twisti@1728:           __ sarl(rdx_temp, BitsPerInt - 1);  // __ extend_sign()
jrose@1145:           __ movl(vmarg2, rdx_temp); // store second word
twisti@1728: #endif
jrose@1145:         }
jrose@1145:         break;
jrose@1145:       case _adapter_opt_unboxl:
jrose@1145:         {
jrose@1145:           // Load the value up from the heap.
jrose@1145:           __ movptr(rdx_temp, vmarg1);
jrose@1145:           int value_offset = java_lang_boxing_object::value_offset_in_bytes(T_LONG);
jrose@1145:           assert(value_offset == java_lang_boxing_object::value_offset_in_bytes(T_DOUBLE), "");
jrose@1145:           __ null_check(rdx_temp, value_offset);
twisti@1728: #ifdef _LP64
twisti@1728:           __ movq(rbx_temp, Address(rdx_temp, value_offset));
twisti@1728:           __ movq(vmarg1, rbx_temp);
twisti@1728: #else
jrose@1145:           __ movl(rbx_temp, Address(rdx_temp, value_offset + 0*BytesPerInt));
jrose@1145:           __ movl(rdx_temp, Address(rdx_temp, value_offset + 1*BytesPerInt));
jrose@1145:           __ movl(vmarg1, rbx_temp);
jrose@1145:           __ movl(vmarg2, rdx_temp);
twisti@1728: #endif
jrose@1145:         }
jrose@1145:         break;
jrose@1145:       default:
twisti@1739:         ShouldNotReachHere();
jrose@1145:       }
jrose@1145: 
twisti@2201:       __ load_heap_oop(rcx_recv, rcx_mh_vmtarget);
jrose@1145:       __ jump_to_method_handle_entry(rcx_recv, rdx_temp);
jrose@1145:     }
jrose@1145:     break;
jrose@1145: 
jrose@1145:   case _adapter_opt_f2d:        // optimized subcase of adapt_prim_to_prim
jrose@1145:   case _adapter_opt_d2f:        // optimized subcase of adapt_prim_to_prim
jrose@1145:     {
jrose@1145:       // perform an in-place floating primitive conversion
jrose@1145:       __ movl(rax_argslot, rcx_amh_vmargslot);
jrose@1145:       __ lea(rax_argslot, __ argument_address(rax_argslot, 1));
jrose@1145:       if (ek == _adapter_opt_f2d) {
never@2895:         insert_arg_slots(_masm, stack_move_unit(),
jrose@1145:                          rax_argslot, rbx_temp, rdx_temp);
jrose@1145:       }
twisti@1861:       Address vmarg(rax_argslot, -Interpreter::stackElementSize);
jrose@1145: 
jrose@1145: #ifdef _LP64
jrose@1145:       if (ek == _adapter_opt_f2d) {
jrose@1145:         __ movflt(xmm0, vmarg);
jrose@1145:         __ cvtss2sd(xmm0, xmm0);
jrose@1145:         __ movdbl(vmarg, xmm0);
jrose@1145:       } else {
jrose@1145:         __ movdbl(xmm0, vmarg);
jrose@1145:         __ cvtsd2ss(xmm0, xmm0);
jrose@1145:         __ movflt(vmarg, xmm0);
jrose@1145:       }
jrose@1145: #else //_LP64
jrose@1145:       if (ek == _adapter_opt_f2d) {
jrose@1145:         __ fld_s(vmarg);        // load float to ST0
twisti@2903:         __ fstp_d(vmarg);       // store double
twisti@1739:       } else {
jrose@1145:         __ fld_d(vmarg);        // load double to ST0
jrose@1145:         __ fstp_s(vmarg);       // store single
jrose@1145:       }
jrose@1145: #endif //_LP64
jrose@1145: 
jrose@1145:       if (ek == _adapter_opt_d2f) {
jrose@1145:         remove_arg_slots(_masm, -stack_move_unit(),
jrose@1145:                          rax_argslot, rbx_temp, rdx_temp);
jrose@1145:       }
jrose@1145: 
twisti@2201:       __ load_heap_oop(rcx_recv, rcx_mh_vmtarget);
jrose@1145:       __ jump_to_method_handle_entry(rcx_recv, rdx_temp);
jrose@1145:     }
jrose@1145:     break;
jrose@1145: 
jrose@1145:   case _adapter_swap_args:
jrose@1145:   case _adapter_rot_args:
jrose@1145:     // handled completely by optimized cases
jrose@1145:     __ stop("init_AdapterMethodHandle should not issue this");
jrose@1145:     break;
jrose@1145: 
jrose@1145:   case _adapter_opt_swap_1:
jrose@1145:   case _adapter_opt_swap_2:
jrose@1145:   case _adapter_opt_rot_1_up:
jrose@1145:   case _adapter_opt_rot_1_down:
jrose@1145:   case _adapter_opt_rot_2_up:
jrose@1145:   case _adapter_opt_rot_2_down:
jrose@1145:     {
never@2895:       int swap_slots = ek_adapter_opt_swap_slots(ek);
never@2895:       int rotate     = ek_adapter_opt_swap_mode(ek);
jrose@1145: 
jrose@1145:       // 'argslot' is the position of the first argument to swap
jrose@1145:       __ movl(rax_argslot, rcx_amh_vmargslot);
jrose@1145:       __ lea(rax_argslot, __ argument_address(rax_argslot));
jrose@1145: 
jrose@1145:       // 'vminfo' is the second
jrose@1145:       Register rbx_destslot = rbx_temp;
never@2895:       load_conversion_vminfo(_masm, rbx_destslot, rcx_amh_conversion);
jrose@1145:       __ lea(rbx_destslot, __ argument_address(rbx_destslot));
never@2895:       if (VerifyMethodHandles)
never@2895:         verify_argslot(_masm, rbx_destslot, "swap point must fall within current frame");
jrose@1145: 
never@2895:       assert(Interpreter::stackElementSize == wordSize, "else rethink use of wordSize here");
jrose@1145:       if (!rotate) {
never@2895:         // simple swap
never@2895:         for (int i = 0; i < swap_slots; i++) {
never@2895:           __ movptr(rdi_temp, Address(rax_argslot,  i * wordSize));
never@2895:           __ movptr(rdx_temp, Address(rbx_destslot, i * wordSize));
never@2895:           __ movptr(Address(rax_argslot,  i * wordSize), rdx_temp);
never@2895:           __ movptr(Address(rbx_destslot, i * wordSize), rdi_temp);
jrose@1145:         }
jrose@1145:       } else {
never@2895:         // A rotate is actually pair of moves, with an "odd slot" (or pair)
never@2895:         // changing place with a series of other slots.
never@2895:         // First, push the "odd slot", which is going to get overwritten
never@2895:         for (int i = swap_slots - 1; i >= 0; i--) {
never@2895:           // handle one with rdi_temp instead of a push:
never@2895:           if (i == 0)  __ movptr(rdi_temp, Address(rax_argslot, i * wordSize));
never@2895:           else         __ pushptr(         Address(rax_argslot, i * wordSize));
jrose@1145:         }
jrose@1145:         if (rotate > 0) {
never@2895:           // Here is rotate > 0:
never@2895:           // (low mem)                                          (high mem)
never@2895:           //     | dest:     more_slots...     | arg: odd_slot :arg+1 |
never@2895:           // =>
never@2895:           //     | dest: odd_slot | dest+1: more_slots...      :arg+1 |
jrose@1145:           // work argslot down to destslot, copying contiguous data upwards
jrose@1145:           // pseudo-code:
jrose@1145:           //   rax = src_addr - swap_bytes
jrose@1145:           //   rbx = dest_addr
jrose@1145:           //   while (rax >= rbx) *(rax + swap_bytes) = *(rax + 0), rax--;
never@2895:           move_arg_slots_up(_masm,
never@2895:                             rbx_destslot,
never@2895:                             Address(rax_argslot, 0),
never@2895:                             swap_slots,
never@2895:                             rax_argslot, rdx_temp);
jrose@1145:         } else {
never@2895:           // Here is the other direction, rotate < 0:
never@2895:           // (low mem)                                          (high mem)
never@2895:           //     | arg: odd_slot | arg+1: more_slots...       :dest+1 |
never@2895:           // =>
never@2895:           //     | arg:    more_slots...     | dest: odd_slot :dest+1 |
jrose@1145:           // work argslot up to destslot, copying contiguous data downwards
jrose@1145:           // pseudo-code:
jrose@1145:           //   rax = src_addr + swap_bytes
jrose@1145:           //   rbx = dest_addr
jrose@1145:           //   while (rax <= rbx) *(rax - swap_bytes) = *(rax + 0), rax++;
never@2895:           __ addptr(rbx_destslot, wordSize);
never@2895:           move_arg_slots_down(_masm,
never@2895:                               Address(rax_argslot, swap_slots * wordSize),
never@2895:                               rbx_destslot,
never@2895:                               -swap_slots,
never@2895:                               rax_argslot, rdx_temp);
never@2895: 
never@2895:           __ subptr(rbx_destslot, wordSize);
jrose@1145:         }
jrose@1145:         // pop the original first chunk into the destination slot, now free
never@2895:         for (int i = 0; i < swap_slots; i++) {
never@2895:           if (i == 0)  __ movptr(Address(rbx_destslot, i * wordSize), rdi_temp);
never@2895:           else         __ popptr(Address(rbx_destslot, i * wordSize));
jrose@1145:         }
jrose@1145:       }
jrose@1145: 
twisti@2201:       __ load_heap_oop(rcx_recv, rcx_mh_vmtarget);
jrose@1145:       __ jump_to_method_handle_entry(rcx_recv, rdx_temp);
jrose@1145:     }
jrose@1145:     break;
jrose@1145: 
jrose@1145:   case _adapter_dup_args:
jrose@1145:     {
jrose@1145:       // 'argslot' is the position of the first argument to duplicate
jrose@1145:       __ movl(rax_argslot, rcx_amh_vmargslot);
jrose@1145:       __ lea(rax_argslot, __ argument_address(rax_argslot));
jrose@1145: 
jrose@1145:       // 'stack_move' is negative number of words to duplicate
never@2895:       Register rdi_stack_move = rdi_temp;
never@2895:       load_stack_move(_masm, rdi_stack_move, rcx_recv, true);
jrose@1145: 
never@2895:       if (VerifyMethodHandles) {
never@2895:         verify_argslots(_masm, rdi_stack_move, rax_argslot, true,
never@2895:                         "copied argument(s) must fall within current frame");
jrose@1145:       }
jrose@1145: 
never@2895:       // insert location is always the bottom of the argument list:
never@2895:       Address insert_location = __ argument_address(constant(0));
never@2895:       int pre_arg_words = insert_location.disp() / wordSize;   // return PC is pushed
never@2895:       assert(insert_location.base() == rsp, "");
jrose@1145: 
never@2895:       __ negl(rdi_stack_move);
never@2895:       push_arg_slots(_masm, rax_argslot, rdi_stack_move,
never@2895:                      pre_arg_words, rbx_temp, rdx_temp);
jrose@1145: 
twisti@2201:       __ load_heap_oop(rcx_recv, rcx_mh_vmtarget);
jrose@1145:       __ jump_to_method_handle_entry(rcx_recv, rdx_temp);
jrose@1145:     }
jrose@1145:     break;
jrose@1145: 
jrose@1145:   case _adapter_drop_args:
jrose@1145:     {
jrose@1145:       // 'argslot' is the position of the first argument to nuke
jrose@1145:       __ movl(rax_argslot, rcx_amh_vmargslot);
jrose@1145:       __ lea(rax_argslot, __ argument_address(rax_argslot));
jrose@1145: 
jrose@1145:       // (must do previous push after argslot address is taken)
jrose@1145: 
jrose@1145:       // 'stack_move' is number of words to drop
never@2895:       Register rdi_stack_move = rdi_temp;
never@2895:       load_stack_move(_masm, rdi_stack_move, rcx_recv, false);
jrose@1145:       remove_arg_slots(_masm, rdi_stack_move,
jrose@1145:                        rax_argslot, rbx_temp, rdx_temp);
jrose@1145: 
twisti@2201:       __ load_heap_oop(rcx_recv, rcx_mh_vmtarget);
jrose@1145:       __ jump_to_method_handle_entry(rcx_recv, rdx_temp);
jrose@1145:     }
jrose@1145:     break;
jrose@1145: 
jrose@1145:   case _adapter_collect_args:
never@2895:   case _adapter_fold_args:
jrose@1145:   case _adapter_spread_args:
jrose@1145:     // handled completely by optimized cases
jrose@1145:     __ stop("init_AdapterMethodHandle should not issue this");
jrose@1145:     break;
jrose@1145: 
never@2895:   case _adapter_opt_collect_ref:
never@2895:   case _adapter_opt_collect_int:
never@2895:   case _adapter_opt_collect_long:
never@2895:   case _adapter_opt_collect_float:
never@2895:   case _adapter_opt_collect_double:
never@2895:   case _adapter_opt_collect_void:
never@2895:   case _adapter_opt_collect_0_ref:
never@2895:   case _adapter_opt_collect_1_ref:
never@2895:   case _adapter_opt_collect_2_ref:
never@2895:   case _adapter_opt_collect_3_ref:
never@2895:   case _adapter_opt_collect_4_ref:
never@2895:   case _adapter_opt_collect_5_ref:
never@2895:   case _adapter_opt_filter_S0_ref:
never@2895:   case _adapter_opt_filter_S1_ref:
never@2895:   case _adapter_opt_filter_S2_ref:
never@2895:   case _adapter_opt_filter_S3_ref:
never@2895:   case _adapter_opt_filter_S4_ref:
never@2895:   case _adapter_opt_filter_S5_ref:
never@2895:   case _adapter_opt_collect_2_S0_ref:
never@2895:   case _adapter_opt_collect_2_S1_ref:
never@2895:   case _adapter_opt_collect_2_S2_ref:
never@2895:   case _adapter_opt_collect_2_S3_ref:
never@2895:   case _adapter_opt_collect_2_S4_ref:
never@2895:   case _adapter_opt_collect_2_S5_ref:
never@2895:   case _adapter_opt_fold_ref:
never@2895:   case _adapter_opt_fold_int:
never@2895:   case _adapter_opt_fold_long:
never@2895:   case _adapter_opt_fold_float:
never@2895:   case _adapter_opt_fold_double:
never@2895:   case _adapter_opt_fold_void:
never@2895:   case _adapter_opt_fold_1_ref:
never@2895:   case _adapter_opt_fold_2_ref:
never@2895:   case _adapter_opt_fold_3_ref:
never@2895:   case _adapter_opt_fold_4_ref:
never@2895:   case _adapter_opt_fold_5_ref:
never@2895:     {
never@2895:       // Given a fresh incoming stack frame, build a new ricochet frame.
never@2895:       // On entry, TOS points at a return PC, and RBP is the callers frame ptr.
never@2895:       // RSI/R13 has the caller's exact stack pointer, which we must also preserve.
never@2895:       // RCX contains an AdapterMethodHandle of the indicated kind.
never@2895: 
never@2895:       // Relevant AMH fields:
never@2895:       // amh.vmargslot:
never@2895:       //   points to the trailing edge of the arguments
never@2895:       //   to filter, collect, or fold.  For a boxing operation,
never@2895:       //   it points just after the single primitive value.
never@2895:       // amh.argument:
never@2895:       //   recursively called MH, on |collect| arguments
never@2895:       // amh.vmtarget:
never@2895:       //   final destination MH, on return value, etc.
never@2895:       // amh.conversion.dest:
never@2895:       //   tells what is the type of the return value
never@2895:       //   (not needed here, since dest is also derived from ek)
never@2895:       // amh.conversion.vminfo:
never@2895:       //   points to the trailing edge of the return value
never@2895:       //   when the vmtarget is to be called; this is
never@2895:       //   equal to vmargslot + (retained ? |collect| : 0)
never@2895: 
never@2895:       // Pass 0 or more argument slots to the recursive target.
never@2895:       int collect_count_constant = ek_adapter_opt_collect_count(ek);
never@2895: 
never@2895:       // The collected arguments are copied from the saved argument list:
never@2895:       int collect_slot_constant = ek_adapter_opt_collect_slot(ek);
never@2895: 
never@2895:       assert(ek_orig == _adapter_collect_args ||
never@2895:              ek_orig == _adapter_fold_args, "");
never@2895:       bool retain_original_args = (ek_orig == _adapter_fold_args);
never@2895: 
never@2895:       // The return value is replaced (or inserted) at the 'vminfo' argslot.
never@2895:       // Sometimes we can compute this statically.
never@2895:       int dest_slot_constant = -1;
never@2895:       if (!retain_original_args)
never@2895:         dest_slot_constant = collect_slot_constant;
never@2895:       else if (collect_slot_constant >= 0 && collect_count_constant >= 0)
never@2895:         // We are preserving all the arguments, and the return value is prepended,
never@2895:         // so the return slot is to the left (above) the |collect| sequence.
never@2895:         dest_slot_constant = collect_slot_constant + collect_count_constant;
never@2895: 
never@2895:       // Replace all those slots by the result of the recursive call.
never@2895:       // The result type can be one of ref, int, long, float, double, void.
never@2895:       // In the case of void, nothing is pushed on the stack after return.
never@2895:       BasicType dest = ek_adapter_opt_collect_type(ek);
never@2895:       assert(dest == type2wfield[dest], "dest is a stack slot type");
never@2895:       int dest_count = type2size[dest];
never@2895:       assert(dest_count == 1 || dest_count == 2 || (dest_count == 0 && dest == T_VOID), "dest has a size");
never@2895: 
never@2895:       // Choose a return continuation.
never@2895:       EntryKind ek_ret = _adapter_opt_return_any;
never@2895:       if (dest != T_CONFLICT && OptimizeMethodHandles) {
never@2895:         switch (dest) {
never@2895:         case T_INT    : ek_ret = _adapter_opt_return_int;     break;
never@2895:         case T_LONG   : ek_ret = _adapter_opt_return_long;    break;
never@2895:         case T_FLOAT  : ek_ret = _adapter_opt_return_float;   break;
never@2895:         case T_DOUBLE : ek_ret = _adapter_opt_return_double;  break;
never@2895:         case T_OBJECT : ek_ret = _adapter_opt_return_ref;     break;
never@2895:         case T_VOID   : ek_ret = _adapter_opt_return_void;    break;
never@2895:         default       : ShouldNotReachHere();
never@2895:         }
never@2895:         if (dest == T_OBJECT && dest_slot_constant >= 0) {
never@2895:           EntryKind ek_try = EntryKind(_adapter_opt_return_S0_ref + dest_slot_constant);
never@2895:           if (ek_try <= _adapter_opt_return_LAST &&
never@2895:               ek_adapter_opt_return_slot(ek_try) == dest_slot_constant) {
never@2895:             ek_ret = ek_try;
never@2895:           }
never@2895:         }
never@2895:         assert(ek_adapter_opt_return_type(ek_ret) == dest, "");
never@2895:       }
never@2895: 
never@2895:       // Already pushed:  ... keep1 | collect | keep2 | sender_pc |
never@2895:       // push(sender_pc);
never@2895: 
never@2895:       // Compute argument base:
never@2895:       Register rax_argv = rax_argslot;
never@2895:       __ lea(rax_argv, __ argument_address(constant(0)));
never@2895: 
never@2895:       // Push a few extra argument words, if we need them to store the return value.
never@2895:       {
never@2895:         int extra_slots = 0;
never@2895:         if (retain_original_args) {
never@2895:           extra_slots = dest_count;
never@2895:         } else if (collect_count_constant == -1) {
never@2895:           extra_slots = dest_count;  // collect_count might be zero; be generous
never@2895:         } else if (dest_count > collect_count_constant) {
never@2895:           extra_slots = (dest_count - collect_count_constant);
never@2895:         } else {
never@2895:           // else we know we have enough dead space in |collect| to repurpose for return values
never@2895:         }
never@2895:         DEBUG_ONLY(extra_slots += 1);
never@2895:         if (extra_slots > 0) {
never@2895:           __ pop(rbx_temp);   // return value
never@2895:           __ subptr(rsp, (extra_slots * Interpreter::stackElementSize));
never@2895:           // Push guard word #2 in debug mode.
never@2895:           DEBUG_ONLY(__ movptr(Address(rsp, 0), (int32_t) RicochetFrame::MAGIC_NUMBER_2));
never@2895:           __ push(rbx_temp);
never@2895:         }
never@2895:       }
never@2895: 
never@2895:       RicochetFrame::enter_ricochet_frame(_masm, rcx_recv, rax_argv,
never@2895:                                           entry(ek_ret)->from_interpreted_entry(), rbx_temp);
never@2895: 
never@2895:       // Now pushed:  ... keep1 | collect | keep2 | RF |
never@2895:       // some handy frame slots:
never@2895:       Address exact_sender_sp_addr = RicochetFrame::frame_address(RicochetFrame::exact_sender_sp_offset_in_bytes());
never@2895:       Address conversion_addr      = RicochetFrame::frame_address(RicochetFrame::conversion_offset_in_bytes());
never@2895:       Address saved_args_base_addr = RicochetFrame::frame_address(RicochetFrame::saved_args_base_offset_in_bytes());
never@2895: 
never@2895: #ifdef ASSERT
never@2895:       if (VerifyMethodHandles && dest != T_CONFLICT) {
never@2895:         BLOCK_COMMENT("verify AMH.conv.dest");
never@2895:         load_conversion_dest_type(_masm, rbx_temp, conversion_addr);
never@2895:         Label L_dest_ok;
never@2895:         __ cmpl(rbx_temp, (int) dest);
never@2895:         __ jcc(Assembler::equal, L_dest_ok);
never@2895:         if (dest == T_INT) {
never@2895:           for (int bt = T_BOOLEAN; bt < T_INT; bt++) {
never@2895:             if (is_subword_type(BasicType(bt))) {
never@2895:               __ cmpl(rbx_temp, (int) bt);
never@2895:               __ jcc(Assembler::equal, L_dest_ok);
never@2895:             }
never@2895:           }
never@2895:         }
never@2895:         __ stop("bad dest in AMH.conv");
never@2895:         __ BIND(L_dest_ok);
never@2895:       }
never@2895: #endif //ASSERT
never@2895: 
never@2895:       // Find out where the original copy of the recursive argument sequence begins.
never@2895:       Register rax_coll = rax_argv;
never@2895:       {
never@2895:         RegisterOrConstant collect_slot = collect_slot_constant;
never@2895:         if (collect_slot_constant == -1) {
never@2895:           __ movl(rdi_temp, rcx_amh_vmargslot);
never@2895:           collect_slot = rdi_temp;
never@2895:         }
never@2895:         if (collect_slot_constant != 0)
never@2895:           __ lea(rax_coll, Address(rax_argv, collect_slot, Interpreter::stackElementScale()));
never@2895:         // rax_coll now points at the trailing edge of |collect| and leading edge of |keep2|
never@2895:       }
never@2895: 
never@2895:       // Replace the old AMH with the recursive MH.  (No going back now.)
never@2895:       // In the case of a boxing call, the recursive call is to a 'boxer' method,
never@2895:       // such as Integer.valueOf or Long.valueOf.  In the case of a filter
never@2895:       // or collect call, it will take one or more arguments, transform them,
never@2895:       // and return some result, to store back into argument_base[vminfo].
never@2895:       __ load_heap_oop(rcx_recv, rcx_amh_argument);
never@2895:       if (VerifyMethodHandles)  verify_method_handle(_masm, rcx_recv);
never@2895: 
never@2895:       // Push a space for the recursively called MH first:
never@2895:       __ push((int32_t)NULL_WORD);
never@2895: 
never@2895:       // Calculate |collect|, the number of arguments we are collecting.
never@2895:       Register rdi_collect_count = rdi_temp;
never@2895:       RegisterOrConstant collect_count;
never@2895:       if (collect_count_constant >= 0) {
never@2895:         collect_count = collect_count_constant;
never@2895:       } else {
never@2895:         __ load_method_handle_vmslots(rdi_collect_count, rcx_recv, rdx_temp);
never@2895:         collect_count = rdi_collect_count;
never@2895:       }
never@2895: #ifdef ASSERT
never@2895:       if (VerifyMethodHandles && collect_count_constant >= 0) {
never@2895:         __ load_method_handle_vmslots(rbx_temp, rcx_recv, rdx_temp);
never@2895:         Label L_count_ok;
never@2895:         __ cmpl(rbx_temp, collect_count_constant);
never@2895:         __ jcc(Assembler::equal, L_count_ok);
never@2895:         __ stop("bad vminfo in AMH.conv");
never@2895:         __ BIND(L_count_ok);
never@2895:       }
never@2895: #endif //ASSERT
never@2895: 
never@2895:       // copy |collect| slots directly to TOS:
never@2895:       push_arg_slots(_masm, rax_coll, collect_count, 0, rbx_temp, rdx_temp);
never@2895:       // Now pushed:  ... keep1 | collect | keep2 | RF... | collect |
never@2895:       // rax_coll still points at the trailing edge of |collect| and leading edge of |keep2|
never@2895: 
never@2895:       // If necessary, adjust the saved arguments to make room for the eventual return value.
never@2895:       // Normal adjustment:  ... keep1 | +dest+ | -collect- | keep2 | RF... | collect |
never@2895:       // If retaining args:  ... keep1 | +dest+ |  collect  | keep2 | RF... | collect |
never@2895:       // In the non-retaining case, this might move keep2 either up or down.
never@2895:       // We don't have to copy the whole | RF... collect | complex,
never@2895:       // but we must adjust RF.saved_args_base.
never@2895:       // Also, from now on, we will forget about the origial copy of |collect|.
never@2895:       // If we are retaining it, we will treat it as part of |keep2|.
never@2895:       // For clarity we will define |keep3| = |collect|keep2| or |keep2|.
never@2895: 
never@2895:       BLOCK_COMMENT("adjust trailing arguments {");
never@2895:       // Compare the sizes of |+dest+| and |-collect-|, which are opposed opening and closing movements.
never@2895:       int                open_count  = dest_count;
never@2895:       RegisterOrConstant close_count = collect_count_constant;
never@2895:       Register rdi_close_count = rdi_collect_count;
never@2895:       if (retain_original_args) {
never@2895:         close_count = constant(0);
never@2895:       } else if (collect_count_constant == -1) {
never@2895:         close_count = rdi_collect_count;
never@2895:       }
never@2895: 
never@2895:       // How many slots need moving?  This is simply dest_slot (0 => no |keep3|).
never@2895:       RegisterOrConstant keep3_count;
never@2895:       Register rsi_keep3_count = rsi;  // can repair from RF.exact_sender_sp
never@2895:       if (dest_slot_constant >= 0) {
never@2895:         keep3_count = dest_slot_constant;
never@2895:       } else  {
never@2895:         load_conversion_vminfo(_masm, rsi_keep3_count, conversion_addr);
never@2895:         keep3_count = rsi_keep3_count;
never@2895:       }
never@2895: #ifdef ASSERT
never@2895:       if (VerifyMethodHandles && dest_slot_constant >= 0) {
never@2895:         load_conversion_vminfo(_masm, rbx_temp, conversion_addr);
never@2895:         Label L_vminfo_ok;
never@2895:         __ cmpl(rbx_temp, dest_slot_constant);
never@2895:         __ jcc(Assembler::equal, L_vminfo_ok);
never@2895:         __ stop("bad vminfo in AMH.conv");
never@2895:         __ BIND(L_vminfo_ok);
never@2895:       }
never@2895: #endif //ASSERT
never@2895: 
never@2895:       // tasks remaining:
never@2895:       bool move_keep3 = (!keep3_count.is_constant() || keep3_count.as_constant() != 0);
never@2895:       bool stomp_dest = (NOT_DEBUG(dest == T_OBJECT) DEBUG_ONLY(dest_count != 0));
never@2895:       bool fix_arg_base = (!close_count.is_constant() || open_count != close_count.as_constant());
never@2895: 
never@2895:       if (stomp_dest | fix_arg_base) {
never@2895:         // we will probably need an updated rax_argv value
never@2895:         if (collect_slot_constant >= 0) {
never@2895:           // rax_coll already holds the leading edge of |keep2|, so tweak it
never@2895:           assert(rax_coll == rax_argv, "elided a move");
never@2895:           if (collect_slot_constant != 0)
never@2895:             __ subptr(rax_argv, collect_slot_constant * Interpreter::stackElementSize);
never@2895:         } else {
never@2895:           // Just reload from RF.saved_args_base.
never@2895:           __ movptr(rax_argv, saved_args_base_addr);
never@2895:         }
never@2895:       }
never@2895: 
never@2895:       // Old and new argument locations (based at slot 0).
never@2895:       // Net shift (&new_argv - &old_argv) is (close_count - open_count).
never@2895:       bool zero_open_count = (open_count == 0);  // remember this bit of info
never@2895:       if (move_keep3 && fix_arg_base) {
never@2895:         // It will be easier t have everything in one register:
never@2895:         if (close_count.is_register()) {
never@2895:           // Deduct open_count from close_count register to get a clean +/- value.
never@2895:           __ subptr(close_count.as_register(), open_count);
never@2895:         } else {
never@2895:           close_count = close_count.as_constant() - open_count;
never@2895:         }
never@2895:         open_count = 0;
never@2895:       }
never@2895:       Address old_argv(rax_argv, 0);
never@2895:       Address new_argv(rax_argv, close_count,  Interpreter::stackElementScale(),
never@2895:                                 - open_count * Interpreter::stackElementSize);
never@2895: 
never@2895:       // First decide if any actual data are to be moved.
never@2895:       // We can skip if (a) |keep3| is empty, or (b) the argument list size didn't change.
never@2895:       // (As it happens, all movements involve an argument list size change.)
never@2895: 
never@2895:       // If there are variable parameters, use dynamic checks to skip around the whole mess.
never@2895:       Label L_done;
never@2895:       if (!keep3_count.is_constant()) {
never@2895:         __ testl(keep3_count.as_register(), keep3_count.as_register());
never@2895:         __ jcc(Assembler::zero, L_done);
never@2895:       }
never@2895:       if (!close_count.is_constant()) {
never@2895:         __ cmpl(close_count.as_register(), open_count);
never@2895:         __ jcc(Assembler::equal, L_done);
never@2895:       }
never@2895: 
never@2895:       if (move_keep3 && fix_arg_base) {
never@2895:         bool emit_move_down = false, emit_move_up = false, emit_guard = false;
never@2895:         if (!close_count.is_constant()) {
never@2895:           emit_move_down = emit_guard = !zero_open_count;
never@2895:           emit_move_up   = true;
never@2895:         } else if (open_count != close_count.as_constant()) {
never@2895:           emit_move_down = (open_count > close_count.as_constant());
never@2895:           emit_move_up   = !emit_move_down;
never@2895:         }
never@2895:         Label L_move_up;
never@2895:         if (emit_guard) {
never@2895:           __ cmpl(close_count.as_register(), open_count);
never@2895:           __ jcc(Assembler::greater, L_move_up);
never@2895:         }
never@2895: 
never@2895:         if (emit_move_down) {
never@2895:           // Move arguments down if |+dest+| > |-collect-|
never@2895:           // (This is rare, except when arguments are retained.)
never@2895:           // This opens space for the return value.
never@2895:           if (keep3_count.is_constant()) {
never@2895:             for (int i = 0; i < keep3_count.as_constant(); i++) {
never@2895:               __ movptr(rdx_temp, old_argv.plus_disp(i * Interpreter::stackElementSize));
never@2895:               __ movptr(          new_argv.plus_disp(i * Interpreter::stackElementSize), rdx_temp);
never@2895:             }
never@2895:           } else {
never@2895:             Register rbx_argv_top = rbx_temp;
never@2895:             __ lea(rbx_argv_top, old_argv.plus_disp(keep3_count, Interpreter::stackElementScale()));
never@2895:             move_arg_slots_down(_masm,
never@2895:                                 old_argv,     // beginning of old argv
never@2895:                                 rbx_argv_top, // end of old argv
never@2895:                                 close_count,  // distance to move down (must be negative)
never@2895:                                 rax_argv, rdx_temp);
never@2895:             // Used argv as an iteration variable; reload from RF.saved_args_base.
never@2895:             __ movptr(rax_argv, saved_args_base_addr);
never@2895:           }
never@2895:         }
never@2895: 
never@2895:         if (emit_guard) {
never@2895:           __ jmp(L_done);  // assumes emit_move_up is true also
never@2895:           __ BIND(L_move_up);
never@2895:         }
never@2895: 
never@2895:         if (emit_move_up) {
never@2895: 
never@2895:           // Move arguments up if |+dest+| < |-collect-|
never@2895:           // (This is usual, except when |keep3| is empty.)
never@2895:           // This closes up the space occupied by the now-deleted collect values.
never@2895:           if (keep3_count.is_constant()) {
never@2895:             for (int i = keep3_count.as_constant() - 1; i >= 0; i--) {
never@2895:               __ movptr(rdx_temp, old_argv.plus_disp(i * Interpreter::stackElementSize));
never@2895:               __ movptr(          new_argv.plus_disp(i * Interpreter::stackElementSize), rdx_temp);
never@2895:             }
never@2895:           } else {
never@2895:             Address argv_top = old_argv.plus_disp(keep3_count, Interpreter::stackElementScale());
never@2895:             move_arg_slots_up(_masm,
never@2895:                               rax_argv,     // beginning of old argv
never@2895:                               argv_top,     // end of old argv
never@2895:                               close_count,  // distance to move up (must be positive)
never@2895:                               rbx_temp, rdx_temp);
never@2895:           }
never@2895:         }
never@2895:       }
never@2895:       __ BIND(L_done);
never@2895: 
never@2895:       if (fix_arg_base) {
never@2895:         // adjust RF.saved_args_base by adding (close_count - open_count)
never@2895:         if (!new_argv.is_same_address(Address(rax_argv, 0)))
never@2895:           __ lea(rax_argv, new_argv);
never@2895:         __ movptr(saved_args_base_addr, rax_argv);
never@2895:       }
never@2895: 
never@2895:       if (stomp_dest) {
never@2895:         // Stomp the return slot, so it doesn't hold garbage.
never@2895:         // This isn't strictly necessary, but it may help detect bugs.
never@2895:         int forty_two = RicochetFrame::RETURN_VALUE_PLACEHOLDER;
never@2895:         __ movptr(Address(rax_argv, keep3_count, Address::times_ptr),
never@2895:                   (int32_t) forty_two);
never@2895:         // uses rsi_keep3_count
never@2895:       }
never@2895:       BLOCK_COMMENT("} adjust trailing arguments");
never@2895: 
never@2895:       BLOCK_COMMENT("do_recursive_call");
never@2895:       __ mov(saved_last_sp, rsp);    // set rsi/r13 for callee
never@2895:       __ pushptr(ExternalAddress(SharedRuntime::ricochet_blob()->bounce_addr()).addr());
never@2895:       // The globally unique bounce address has two purposes:
never@2895:       // 1. It helps the JVM recognize this frame (frame::is_ricochet_frame).
never@2895:       // 2. When returned to, it cuts back the stack and redirects control flow
never@2895:       //    to the return handler.
never@2895:       // The return handler will further cut back the stack when it takes
never@2895:       // down the RF.  Perhaps there is a way to streamline this further.
never@2895: 
never@2895:       // State during recursive call:
never@2895:       // ... keep1 | dest | dest=42 | keep3 | RF... | collect | bounce_pc |
never@2895:       __ jump_to_method_handle_entry(rcx_recv, rdx_temp);
never@2895: 
never@2895:       break;
never@2895:     }
never@2895: 
never@2895:   case _adapter_opt_return_ref:
never@2895:   case _adapter_opt_return_int:
never@2895:   case _adapter_opt_return_long:
never@2895:   case _adapter_opt_return_float:
never@2895:   case _adapter_opt_return_double:
never@2895:   case _adapter_opt_return_void:
never@2895:   case _adapter_opt_return_S0_ref:
never@2895:   case _adapter_opt_return_S1_ref:
never@2895:   case _adapter_opt_return_S2_ref:
never@2895:   case _adapter_opt_return_S3_ref:
never@2895:   case _adapter_opt_return_S4_ref:
never@2895:   case _adapter_opt_return_S5_ref:
never@2895:     {
never@2895:       BasicType dest_type_constant = ek_adapter_opt_return_type(ek);
never@2895:       int       dest_slot_constant = ek_adapter_opt_return_slot(ek);
never@2895: 
never@2895:       if (VerifyMethodHandles)  RicochetFrame::verify_clean(_masm);
never@2895: 
never@2895:       if (dest_slot_constant == -1) {
never@2895:         // The current stub is a general handler for this dest_type.
never@2895:         // It can be called from _adapter_opt_return_any below.
never@2895:         // Stash the address in a little table.
never@2895:         assert((dest_type_constant & CONV_TYPE_MASK) == dest_type_constant, "oob");
never@2895:         address return_handler = __ pc();
never@2895:         _adapter_return_handlers[dest_type_constant] = return_handler;
never@2895:         if (dest_type_constant == T_INT) {
never@2895:           // do the subword types too
never@2895:           for (int bt = T_BOOLEAN; bt < T_INT; bt++) {
never@2895:             if (is_subword_type(BasicType(bt)) &&
never@2895:                 _adapter_return_handlers[bt] == NULL) {
never@2895:               _adapter_return_handlers[bt] = return_handler;
never@2895:             }
never@2895:           }
never@2895:         }
never@2895:       }
never@2895: 
never@2895:       Register rbx_arg_base = rbx_temp;
never@2895:       assert_different_registers(rax, rdx,  // possibly live return value registers
never@2895:                                  rdi_temp, rbx_arg_base);
never@2895: 
never@2895:       Address conversion_addr      = RicochetFrame::frame_address(RicochetFrame::conversion_offset_in_bytes());
never@2895:       Address saved_args_base_addr = RicochetFrame::frame_address(RicochetFrame::saved_args_base_offset_in_bytes());
never@2895: 
never@2895:       __ movptr(rbx_arg_base, saved_args_base_addr);
never@2895:       RegisterOrConstant dest_slot = dest_slot_constant;
never@2895:       if (dest_slot_constant == -1) {
never@2895:         load_conversion_vminfo(_masm, rdi_temp, conversion_addr);
never@2895:         dest_slot = rdi_temp;
never@2895:       }
never@2895:       // Store the result back into the argslot.
never@2895:       // This code uses the interpreter calling sequence, in which the return value
never@2895:       // is usually left in the TOS register, as defined by InterpreterMacroAssembler::pop.
never@2895:       // There are certain irregularities with floating point values, which can be seen
never@2895:       // in TemplateInterpreterGenerator::generate_return_entry_for.
never@2895:       move_return_value(_masm, dest_type_constant, Address(rbx_arg_base, dest_slot, Interpreter::stackElementScale()));
never@2895: 
never@2895:       RicochetFrame::leave_ricochet_frame(_masm, rcx_recv, rbx_arg_base, rdx_temp);
never@2895:       __ push(rdx_temp);  // repush the return PC
never@2895: 
never@2895:       // Load the final target and go.
never@2895:       if (VerifyMethodHandles)  verify_method_handle(_masm, rcx_recv);
never@2895:       __ jump_to_method_handle_entry(rcx_recv, rdx_temp);
never@2895:       __ hlt(); // --------------------
never@2895:       break;
never@2895:     }
never@2895: 
never@2895:   case _adapter_opt_return_any:
never@2895:     {
never@2895:       if (VerifyMethodHandles)  RicochetFrame::verify_clean(_masm);
never@2895:       Register rdi_conv = rdi_temp;
never@2895:       assert_different_registers(rax, rdx,  // possibly live return value registers
never@2895:                                  rdi_conv, rbx_temp);
never@2895: 
never@2895:       Address conversion_addr = RicochetFrame::frame_address(RicochetFrame::conversion_offset_in_bytes());
never@2895:       load_conversion_dest_type(_masm, rdi_conv, conversion_addr);
never@2895:       __ lea(rbx_temp, ExternalAddress((address) &_adapter_return_handlers[0]));
never@2895:       __ movptr(rbx_temp, Address(rbx_temp, rdi_conv, Address::times_ptr));
never@2895: 
never@2895: #ifdef ASSERT
never@2895:       { Label L_badconv;
never@2895:         __ testptr(rbx_temp, rbx_temp);
never@2895:         __ jccb(Assembler::zero, L_badconv);
never@2895:         __ jmp(rbx_temp);
never@2895:         __ bind(L_badconv);
never@2895:         __ stop("bad method handle return");
never@2895:       }
never@2895: #else //ASSERT
never@2895:       __ jmp(rbx_temp);
never@2895: #endif //ASSERT
never@2895:       break;
never@2895:     }
never@2895: 
jrose@1145:   case _adapter_opt_spread_0:
never@2895:   case _adapter_opt_spread_1_ref:
never@2895:   case _adapter_opt_spread_2_ref:
never@2895:   case _adapter_opt_spread_3_ref:
never@2895:   case _adapter_opt_spread_4_ref:
never@2895:   case _adapter_opt_spread_5_ref:
never@2895:   case _adapter_opt_spread_ref:
never@2895:   case _adapter_opt_spread_byte:
never@2895:   case _adapter_opt_spread_char:
never@2895:   case _adapter_opt_spread_short:
never@2895:   case _adapter_opt_spread_int:
never@2895:   case _adapter_opt_spread_long:
never@2895:   case _adapter_opt_spread_float:
never@2895:   case _adapter_opt_spread_double:
jrose@1145:     {
jrose@1145:       // spread an array out into a group of arguments
never@2895:       int length_constant = ek_adapter_opt_spread_count(ek);
never@2895:       bool length_can_be_zero = (length_constant == 0);
never@2895:       if (length_constant < 0) {
never@2895:         // some adapters with variable length must handle the zero case
never@2895:         if (!OptimizeMethodHandles ||
never@2895:             ek_adapter_opt_spread_type(ek) != T_OBJECT)
never@2895:           length_can_be_zero = true;
never@2895:       }
jrose@1145: 
jrose@1145:       // find the address of the array argument
jrose@1145:       __ movl(rax_argslot, rcx_amh_vmargslot);
jrose@1145:       __ lea(rax_argslot, __ argument_address(rax_argslot));
jrose@1145: 
never@2895:       // grab another temp
never@2895:       Register rsi_temp = rsi;
never@2895:       { if (rsi_temp == saved_last_sp)  __ push(saved_last_sp); }
never@2895:       // (preceding push must be done after argslot address is taken!)
never@2895: #define UNPUSH_RSI \
never@2895:       { if (rsi_temp == saved_last_sp)  __ pop(saved_last_sp); }
jrose@1145: 
jrose@1145:       // arx_argslot points both to the array and to the first output arg
jrose@1145:       vmarg = Address(rax_argslot, 0);
jrose@1145: 
jrose@1145:       // Get the array value.
never@2895:       Register  rsi_array       = rsi_temp;
jrose@1145:       Register  rdx_array_klass = rdx_temp;
never@2895:       BasicType elem_type = ek_adapter_opt_spread_type(ek);
never@2895:       int       elem_slots = type2size[elem_type];  // 1 or 2
never@2895:       int       array_slots = 1;  // array is always a T_OBJECT
jrose@1145:       int       length_offset   = arrayOopDesc::length_offset_in_bytes();
jrose@1145:       int       elem0_offset    = arrayOopDesc::base_offset_in_bytes(elem_type);
jrose@1145:       __ movptr(rsi_array, vmarg);
never@2895: 
never@2895:       Label L_array_is_empty, L_insert_arg_space, L_copy_args, L_args_done;
never@2895:       if (length_can_be_zero) {
never@2895:         // handle the null pointer case, if zero is allowed
never@2895:         Label L_skip;
never@2895:         if (length_constant < 0) {
never@2895:           load_conversion_vminfo(_masm, rbx_temp, rcx_amh_conversion);
never@2895:           __ testl(rbx_temp, rbx_temp);
never@2895:           __ jcc(Assembler::notZero, L_skip);
never@2895:         }
jrose@1145:         __ testptr(rsi_array, rsi_array);
never@2895:         __ jcc(Assembler::zero, L_array_is_empty);
never@2895:         __ bind(L_skip);
jrose@1145:       }
jrose@1145:       __ null_check(rsi_array, oopDesc::klass_offset_in_bytes());
jrose@1145:       __ load_klass(rdx_array_klass, rsi_array);
jrose@1145: 
jrose@1145:       // Check the array type.
jrose@1145:       Register rbx_klass = rbx_temp;
twisti@2201:       __ load_heap_oop(rbx_klass, rcx_amh_argument); // this is a Class object!
never@2895:       load_klass_from_Class(_masm, rbx_klass);
jrose@1145: 
jrose@1145:       Label ok_array_klass, bad_array_klass, bad_array_length;
never@2895:       __ check_klass_subtype(rdx_array_klass, rbx_klass, rdi_temp, ok_array_klass);
jrose@1145:       // If we get here, the type check failed!
jrose@1145:       __ jmp(bad_array_klass);
never@2895:       __ BIND(ok_array_klass);
jrose@1145: 
jrose@1145:       // Check length.
jrose@1145:       if (length_constant >= 0) {
jrose@1145:         __ cmpl(Address(rsi_array, length_offset), length_constant);
jrose@1145:       } else {
jrose@1145:         Register rbx_vminfo = rbx_temp;
never@2895:         load_conversion_vminfo(_masm, rbx_vminfo, rcx_amh_conversion);
jrose@1145:         __ cmpl(rbx_vminfo, Address(rsi_array, length_offset));
jrose@1145:       }
jrose@1145:       __ jcc(Assembler::notEqual, bad_array_length);
jrose@1145: 
jrose@1145:       Register rdx_argslot_limit = rdx_temp;
jrose@1145: 
jrose@1145:       // Array length checks out.  Now insert any required stack slots.
jrose@1145:       if (length_constant == -1) {
jrose@1145:         // Form a pointer to the end of the affected region.
twisti@1861:         __ lea(rdx_argslot_limit, Address(rax_argslot, Interpreter::stackElementSize));
jrose@1145:         // 'stack_move' is negative number of words to insert
never@2895:         // This number already accounts for elem_slots.
never@2895:         Register rdi_stack_move = rdi_temp;
never@2895:         load_stack_move(_masm, rdi_stack_move, rcx_recv, true);
never@2895:         __ cmpptr(rdi_stack_move, 0);
never@2895:         assert(stack_move_unit() < 0, "else change this comparison");
never@2895:         __ jcc(Assembler::less, L_insert_arg_space);
never@2895:         __ jcc(Assembler::equal, L_copy_args);
never@2895:         // single argument case, with no array movement
never@2895:         __ BIND(L_array_is_empty);
never@2895:         remove_arg_slots(_masm, -stack_move_unit() * array_slots,
never@2895:                          rax_argslot, rbx_temp, rdx_temp);
never@2895:         __ jmp(L_args_done);  // no spreading to do
never@2895:         __ BIND(L_insert_arg_space);
never@2895:         // come here in the usual case, stack_move < 0 (2 or more spread arguments)
jrose@1145:         Register rsi_temp = rsi_array;  // spill this
never@2895:         insert_arg_slots(_masm, rdi_stack_move,
jrose@1145:                          rax_argslot, rbx_temp, rsi_temp);
never@2895:         // reload the array since rsi was killed
never@2895:         // reload from rdx_argslot_limit since rax_argslot is now decremented
never@2895:         __ movptr(rsi_array, Address(rdx_argslot_limit, -Interpreter::stackElementSize));
never@2895:       } else if (length_constant >= 1) {
never@2895:         int new_slots = (length_constant * elem_slots) - array_slots;
never@2895:         insert_arg_slots(_masm, new_slots * stack_move_unit(),
jrose@1145:                          rax_argslot, rbx_temp, rdx_temp);
jrose@1145:       } else if (length_constant == 0) {
never@2895:         __ BIND(L_array_is_empty);
never@2895:         remove_arg_slots(_masm, -stack_move_unit() * array_slots,
jrose@1145:                          rax_argslot, rbx_temp, rdx_temp);
never@2895:       } else {
never@2895:         ShouldNotReachHere();
jrose@1145:       }
jrose@1145: 
jrose@1145:       // Copy from the array to the new slots.
jrose@1145:       // Note: Stack change code preserves integrity of rax_argslot pointer.
jrose@1145:       // So even after slot insertions, rax_argslot still points to first argument.
never@2895:       // Beware:  Arguments that are shallow on the stack are deep in the array,
never@2895:       // and vice versa.  So a downward-growing stack (the usual) has to be copied
never@2895:       // elementwise in reverse order from the source array.
never@2895:       __ BIND(L_copy_args);
jrose@1145:       if (length_constant == -1) {
jrose@1145:         // [rax_argslot, rdx_argslot_limit) is the area we are inserting into.
never@2895:         // Array element [0] goes at rdx_argslot_limit[-wordSize].
jrose@1145:         Register rsi_source = rsi_array;
jrose@1145:         __ lea(rsi_source, Address(rsi_array, elem0_offset));
never@2895:         Register rdx_fill_ptr = rdx_argslot_limit;
jrose@1145:         Label loop;
never@2895:         __ BIND(loop);
never@2895:         __ addptr(rdx_fill_ptr, -Interpreter::stackElementSize * elem_slots);
never@2895:         move_typed_arg(_masm, elem_type, true,
never@2895:                        Address(rdx_fill_ptr, 0), Address(rsi_source, 0),
never@2895:                        rbx_temp, rdi_temp);
jrose@1145:         __ addptr(rsi_source, type2aelembytes(elem_type));
never@2895:         __ cmpptr(rdx_fill_ptr, rax_argslot);
twisti@2903:         __ jcc(Assembler::above, loop);
jrose@1145:       } else if (length_constant == 0) {
jrose@1145:         // nothing to copy
jrose@1145:       } else {
jrose@1145:         int elem_offset = elem0_offset;
never@2895:         int slot_offset = length_constant * Interpreter::stackElementSize;
jrose@1145:         for (int index = 0; index < length_constant; index++) {
never@2895:           slot_offset -= Interpreter::stackElementSize * elem_slots;  // fill backward
never@2895:           move_typed_arg(_masm, elem_type, true,
never@2895:                          Address(rax_argslot, slot_offset), Address(rsi_array, elem_offset),
never@2895:                          rbx_temp, rdi_temp);
jrose@1145:           elem_offset += type2aelembytes(elem_type);
jrose@1145:         }
jrose@1145:       }
never@2895:       __ BIND(L_args_done);
jrose@1145: 
jrose@1145:       // Arguments are spread.  Move to next method handle.
never@2895:       UNPUSH_RSI;
twisti@2201:       __ load_heap_oop(rcx_recv, rcx_mh_vmtarget);
jrose@1145:       __ jump_to_method_handle_entry(rcx_recv, rdx_temp);
jrose@1145: 
jrose@1145:       __ bind(bad_array_klass);
never@2895:       UNPUSH_RSI;
twisti@2411:       assert(!vmarg.uses(rarg2_required), "must be different registers");
never@2895:       __ load_heap_oop( rarg2_required, Address(rdx_array_klass, java_mirror_offset));  // required type
never@2895:       __ movptr(        rarg1_actual,   vmarg);                                         // bad array
never@2895:       __ movl(          rarg0_code,     (int) Bytecodes::_aaload);                      // who is complaining?
jrose@1474:       __ jump(ExternalAddress(from_interpreted_entry(_raise_exception)));
jrose@1145: 
jrose@1145:       __ bind(bad_array_length);
never@2895:       UNPUSH_RSI;
twisti@2411:       assert(!vmarg.uses(rarg2_required), "must be different registers");
never@2895:       __ mov(    rarg2_required, rcx_recv);                       // AMH requiring a certain length
never@2895:       __ movptr( rarg1_actual,   vmarg);                          // bad array
never@2895:       __ movl(   rarg0_code,     (int) Bytecodes::_arraylength);  // who is complaining?
jrose@1474:       __ jump(ExternalAddress(from_interpreted_entry(_raise_exception)));
never@2895: #undef UNPUSH_RSI
jrose@1145: 
never@2895:       break;
jrose@1145:     }
jrose@1145: 
never@2895:   default:
never@2895:     // do not require all platforms to recognize all adapter types
never@2895:     __ nop();
never@2895:     return;
jrose@1145:   }
jrose@1145:   __ hlt();
jrose@1145: 
jrose@1145:   address me_cookie = MethodHandleEntry::start_compiled_entry(_masm, interp_entry);
jrose@1145:   __ unimplemented(entry_name(ek)); // %%% FIXME: NYI
jrose@1145: 
jrose@1145:   init_entry(ek, MethodHandleEntry::finish_compiled_entry(_masm, me_cookie));
jrose@1145: }