methodHandles_x86.cpp 100.2 KB
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/*
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 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
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 *
 */

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#include "precompiled.hpp"
#include "interpreter/interpreter.hpp"
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#include "interpreter/interpreterRuntime.hpp"
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#include "memory/allocation.inline.hpp"
#include "prims/methodHandles.hpp"
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#define __ _masm->

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#ifdef PRODUCT
#define BLOCK_COMMENT(str) /* nothing */
#else
#define BLOCK_COMMENT(str) __ block_comment(str)
#endif

#define BIND(label) bind(label); BLOCK_COMMENT(#label ":")

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// Workaround for C++ overloading nastiness on '0' for RegisterOrConstant.
static RegisterOrConstant constant(int value) {
  return RegisterOrConstant(value);
}

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address MethodHandleEntry::start_compiled_entry(MacroAssembler* _masm,
                                                address interpreted_entry) {
  // Just before the actual machine code entry point, allocate space
  // for a MethodHandleEntry::Data record, so that we can manage everything
  // from one base pointer.
  __ align(wordSize);
  address target = __ pc() + sizeof(Data);
  while (__ pc() < target) {
    __ nop();
    __ align(wordSize);
  }

  MethodHandleEntry* me = (MethodHandleEntry*) __ pc();
  me->set_end_address(__ pc());         // set a temporary end_address
  me->set_from_interpreted_entry(interpreted_entry);
  me->set_type_checking_entry(NULL);

  return (address) me;
}

MethodHandleEntry* MethodHandleEntry::finish_compiled_entry(MacroAssembler* _masm,
                                                address start_addr) {
  MethodHandleEntry* me = (MethodHandleEntry*) start_addr;
  assert(me->end_address() == start_addr, "valid ME");

  // Fill in the real end_address:
  __ align(wordSize);
  me->set_end_address(__ pc());

  return me;
}

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// stack walking support

frame MethodHandles::ricochet_frame_sender(const frame& fr, RegisterMap *map) {
  RicochetFrame* f = RicochetFrame::from_frame(fr);
  if (map->update_map())
    frame::update_map_with_saved_link(map, &f->_sender_link);
  return frame(f->extended_sender_sp(), f->exact_sender_sp(), f->sender_link(), f->sender_pc());
}

void MethodHandles::ricochet_frame_oops_do(const frame& fr, OopClosure* blk, const RegisterMap* reg_map) {
  RicochetFrame* f = RicochetFrame::from_frame(fr);

  // pick up the argument type descriptor:
  Thread* thread = Thread::current();
  Handle cookie(thread, f->compute_saved_args_layout(true, true));

  // process fixed part
  blk->do_oop((oop*)f->saved_target_addr());
  blk->do_oop((oop*)f->saved_args_layout_addr());

  // process variable arguments:
  if (cookie.is_null())  return;  // no arguments to describe

  // the cookie is actually the invokeExact method for my target
  // his argument signature is what I'm interested in
  assert(cookie->is_method(), "");
  methodHandle invoker(thread, methodOop(cookie()));
  assert(invoker->name() == vmSymbols::invokeExact_name(), "must be this kind of method");
  assert(!invoker->is_static(), "must have MH argument");
  int slot_count = invoker->size_of_parameters();
  assert(slot_count >= 1, "must include 'this'");
  intptr_t* base = f->saved_args_base();
  intptr_t* retval = NULL;
  if (f->has_return_value_slot())
    retval = f->return_value_slot_addr();
  int slot_num = slot_count;
  intptr_t* loc = &base[slot_num -= 1];
  //blk->do_oop((oop*) loc);   // original target, which is irrelevant
  int arg_num = 0;
  for (SignatureStream ss(invoker->signature()); !ss.is_done(); ss.next()) {
    if (ss.at_return_type())  continue;
    BasicType ptype = ss.type();
    if (ptype == T_ARRAY)  ptype = T_OBJECT; // fold all refs to T_OBJECT
    assert(ptype >= T_BOOLEAN && ptype <= T_OBJECT, "not array or void");
    loc = &base[slot_num -= type2size[ptype]];
    bool is_oop = (ptype == T_OBJECT && loc != retval);
    if (is_oop)  blk->do_oop((oop*)loc);
    arg_num += 1;
  }
  assert(slot_num == 0, "must have processed all the arguments");
}

oop MethodHandles::RicochetFrame::compute_saved_args_layout(bool read_cache, bool write_cache) {
  oop cookie = NULL;
  if (read_cache) {
    cookie = saved_args_layout();
    if (cookie != NULL)  return cookie;
  }
  oop target = saved_target();
  oop mtype  = java_lang_invoke_MethodHandle::type(target);
  oop mtform = java_lang_invoke_MethodType::form(mtype);
  cookie = java_lang_invoke_MethodTypeForm::vmlayout(mtform);
  if (write_cache)  {
    (*saved_args_layout_addr()) = cookie;
  }
  return cookie;
}

void MethodHandles::RicochetFrame::generate_ricochet_blob(MacroAssembler* _masm,
                                                          // output params:
                                                          int* bounce_offset,
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                                                          int* exception_offset,
                                                          int* frame_size_in_words) {
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  (*frame_size_in_words) = RicochetFrame::frame_size_in_bytes() / wordSize;

  address start = __ pc();

#ifdef ASSERT
  __ hlt(); __ hlt(); __ hlt();
  // here's a hint of something special:
  __ push(MAGIC_NUMBER_1);
  __ push(MAGIC_NUMBER_2);
#endif //ASSERT
  __ hlt();  // not reached

  // A return PC has just been popped from the stack.
  // Return values are in registers.
  // The ebp points into the RicochetFrame, which contains
  // a cleanup continuation we must return to.

  (*bounce_offset) = __ pc() - start;
  BLOCK_COMMENT("ricochet_blob.bounce");

  if (VerifyMethodHandles)  RicochetFrame::verify_clean(_masm);
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  trace_method_handle(_masm, "return/ricochet_blob.bounce");
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  __ jmp(frame_address(continuation_offset_in_bytes()));
  __ hlt();
  DEBUG_ONLY(__ push(MAGIC_NUMBER_2));

  (*exception_offset) = __ pc() - start;
  BLOCK_COMMENT("ricochet_blob.exception");

  // compare this to Interpreter::rethrow_exception_entry, which is parallel code
  // for example, see TemplateInterpreterGenerator::generate_throw_exception
  // Live registers in:
  //   rax: exception
  //   rdx: return address/pc that threw exception (ignored, always equal to bounce addr)
  __ verify_oop(rax);

  // no need to empty_FPU_stack or reinit_heapbase, since caller frame will do the same if needed

  // Take down the frame.

  // Cf. InterpreterMacroAssembler::remove_activation.
  leave_ricochet_frame(_masm, /*rcx_recv=*/ noreg,
                       saved_last_sp_register(),
                       /*sender_pc_reg=*/ rdx);

  // In between activations - previous activation type unknown yet
  // compute continuation point - the continuation point expects the
  // following registers set up:
  //
  // rax: exception
  // rdx: return address/pc that threw exception
  // rsp: expression stack of caller
  // rbp: ebp of caller
  __ push(rax);                                  // save exception
  __ push(rdx);                                  // save return address
  Register thread_reg = LP64_ONLY(r15_thread) NOT_LP64(rdi);
  NOT_LP64(__ get_thread(thread_reg));
  __ call_VM_leaf(CAST_FROM_FN_PTR(address,
                                   SharedRuntime::exception_handler_for_return_address),
                  thread_reg, rdx);
  __ mov(rbx, rax);                              // save exception handler
  __ pop(rdx);                                   // restore return address
  __ pop(rax);                                   // restore exception
  __ jmp(rbx);                                   // jump to exception
                                                 // handler of caller
}

void MethodHandles::RicochetFrame::enter_ricochet_frame(MacroAssembler* _masm,
                                                        Register rcx_recv,
                                                        Register rax_argv,
                                                        address return_handler,
                                                        Register rbx_temp) {
  const Register saved_last_sp = saved_last_sp_register();
  Address rcx_mh_vmtarget(    rcx_recv, java_lang_invoke_MethodHandle::vmtarget_offset_in_bytes() );
  Address rcx_amh_conversion( rcx_recv, java_lang_invoke_AdapterMethodHandle::conversion_offset_in_bytes() );

  // Push the RicochetFrame a word at a time.
  // This creates something similar to an interpreter frame.
  // Cf. TemplateInterpreterGenerator::generate_fixed_frame.
  BLOCK_COMMENT("push RicochetFrame {");
  DEBUG_ONLY(int rfo = (int) sizeof(RicochetFrame));
  assert((rfo -= wordSize) == RicochetFrame::sender_pc_offset_in_bytes(), "");
#define RF_FIELD(push_value, name)                                      \
  { push_value;                                                         \
    assert((rfo -= wordSize) == RicochetFrame::name##_offset_in_bytes(), ""); }
  RF_FIELD(__ push(rbp),                   sender_link);
  RF_FIELD(__ push(saved_last_sp),         exact_sender_sp);  // rsi/r13
  RF_FIELD(__ pushptr(rcx_amh_conversion), conversion);
  RF_FIELD(__ push(rax_argv),              saved_args_base);   // can be updated if args are shifted
  RF_FIELD(__ push((int32_t) NULL_WORD),   saved_args_layout); // cache for GC layout cookie
  if (UseCompressedOops) {
    __ load_heap_oop(rbx_temp, rcx_mh_vmtarget);
    RF_FIELD(__ push(rbx_temp),            saved_target);
  } else {
    RF_FIELD(__ pushptr(rcx_mh_vmtarget),  saved_target);
  }
  __ lea(rbx_temp, ExternalAddress(return_handler));
  RF_FIELD(__ push(rbx_temp),              continuation);
#undef RF_FIELD
  assert(rfo == 0, "fully initialized the RicochetFrame");
  // compute new frame pointer:
  __ lea(rbp, Address(rsp, RicochetFrame::sender_link_offset_in_bytes()));
  // Push guard word #1 in debug mode.
  DEBUG_ONLY(__ push((int32_t) RicochetFrame::MAGIC_NUMBER_1));
  // For debugging, leave behind an indication of which stub built this frame.
  DEBUG_ONLY({ Label L; __ call(L, relocInfo::none); __ bind(L); });
  BLOCK_COMMENT("} RicochetFrame");
}

void MethodHandles::RicochetFrame::leave_ricochet_frame(MacroAssembler* _masm,
                                                        Register rcx_recv,
                                                        Register new_sp_reg,
                                                        Register sender_pc_reg) {
  assert_different_registers(rcx_recv, new_sp_reg, sender_pc_reg);
  const Register saved_last_sp = saved_last_sp_register();
  // Take down the frame.
  // Cf. InterpreterMacroAssembler::remove_activation.
  BLOCK_COMMENT("end_ricochet_frame {");
  // TO DO: If (exact_sender_sp - extended_sender_sp) > THRESH, compact the frame down.
  // This will keep stack in bounds even with unlimited tailcalls, each with an adapter.
  if (rcx_recv->is_valid())
    __ movptr(rcx_recv,    RicochetFrame::frame_address(RicochetFrame::saved_target_offset_in_bytes()));
  __ movptr(sender_pc_reg, RicochetFrame::frame_address(RicochetFrame::sender_pc_offset_in_bytes()));
  __ movptr(saved_last_sp, RicochetFrame::frame_address(RicochetFrame::exact_sender_sp_offset_in_bytes()));
  __ movptr(rbp,           RicochetFrame::frame_address(RicochetFrame::sender_link_offset_in_bytes()));
  __ mov(rsp, new_sp_reg);
  BLOCK_COMMENT("} end_ricochet_frame");
}

// Emit code to verify that RBP is pointing at a valid ricochet frame.
#ifdef ASSERT
enum {
  ARG_LIMIT = 255, SLOP = 4,
  // use this parameter for checking for garbage stack movements:
  UNREASONABLE_STACK_MOVE = (ARG_LIMIT + SLOP)
  // the slop defends against false alarms due to fencepost errors
};

void MethodHandles::RicochetFrame::verify_clean(MacroAssembler* _masm) {
  // The stack should look like this:
  //    ... keep1 | dest=42 | keep2 | RF | magic | handler | magic | recursive args |
  // Check various invariants.
  verify_offsets();

  Register rdi_temp = rdi;
  Register rcx_temp = rcx;
  { __ push(rdi_temp); __ push(rcx_temp); }
#define UNPUSH_TEMPS \
  { __ pop(rcx_temp);  __ pop(rdi_temp); }

  Address magic_number_1_addr  = RicochetFrame::frame_address(RicochetFrame::magic_number_1_offset_in_bytes());
  Address magic_number_2_addr  = RicochetFrame::frame_address(RicochetFrame::magic_number_2_offset_in_bytes());
  Address continuation_addr    = RicochetFrame::frame_address(RicochetFrame::continuation_offset_in_bytes());
  Address conversion_addr      = RicochetFrame::frame_address(RicochetFrame::conversion_offset_in_bytes());
  Address saved_args_base_addr = RicochetFrame::frame_address(RicochetFrame::saved_args_base_offset_in_bytes());

  Label L_bad, L_ok;
  BLOCK_COMMENT("verify_clean {");
  // Magic numbers must check out:
  __ cmpptr(magic_number_1_addr, (int32_t) MAGIC_NUMBER_1);
  __ jcc(Assembler::notEqual, L_bad);
  __ cmpptr(magic_number_2_addr, (int32_t) MAGIC_NUMBER_2);
  __ jcc(Assembler::notEqual, L_bad);

  // Arguments pointer must look reasonable:
  __ movptr(rcx_temp, saved_args_base_addr);
  __ cmpptr(rcx_temp, rbp);
  __ jcc(Assembler::below, L_bad);
  __ subptr(rcx_temp, UNREASONABLE_STACK_MOVE * Interpreter::stackElementSize);
  __ cmpptr(rcx_temp, rbp);
  __ jcc(Assembler::above, L_bad);

  load_conversion_dest_type(_masm, rdi_temp, conversion_addr);
  __ cmpl(rdi_temp, T_VOID);
  __ jcc(Assembler::equal, L_ok);
  __ movptr(rcx_temp, saved_args_base_addr);
  load_conversion_vminfo(_masm, rdi_temp, conversion_addr);
  __ cmpptr(Address(rcx_temp, rdi_temp, Interpreter::stackElementScale()),
            (int32_t) RETURN_VALUE_PLACEHOLDER);
  __ jcc(Assembler::equal, L_ok);
  __ BIND(L_bad);
  UNPUSH_TEMPS;
  __ stop("damaged ricochet frame");
  __ BIND(L_ok);
  UNPUSH_TEMPS;
  BLOCK_COMMENT("} verify_clean");

#undef UNPUSH_TEMPS

}
#endif //ASSERT

void MethodHandles::load_klass_from_Class(MacroAssembler* _masm, Register klass_reg) {
  if (VerifyMethodHandles)
    verify_klass(_masm, klass_reg, SystemDictionaryHandles::Class_klass(),
                 "AMH argument is a Class");
  __ load_heap_oop(klass_reg, Address(klass_reg, java_lang_Class::klass_offset_in_bytes()));
}

void MethodHandles::load_conversion_vminfo(MacroAssembler* _masm, Register reg, Address conversion_field_addr) {
  int bits   = BitsPerByte;
  int offset = (CONV_VMINFO_SHIFT / bits);
  int shift  = (CONV_VMINFO_SHIFT % bits);
  __ load_unsigned_byte(reg, conversion_field_addr.plus_disp(offset));
  assert(CONV_VMINFO_MASK == right_n_bits(bits - shift), "else change type of previous load");
  assert(shift == 0, "no shift needed");
}

void MethodHandles::load_conversion_dest_type(MacroAssembler* _masm, Register reg, Address conversion_field_addr) {
  int bits   = BitsPerByte;
  int offset = (CONV_DEST_TYPE_SHIFT / bits);
  int shift  = (CONV_DEST_TYPE_SHIFT % bits);
  __ load_unsigned_byte(reg, conversion_field_addr.plus_disp(offset));
  assert(CONV_TYPE_MASK == right_n_bits(bits - shift), "else change type of previous load");
  __ shrl(reg, shift);
  DEBUG_ONLY(int conv_type_bits = (int) exact_log2(CONV_TYPE_MASK+1));
  assert((shift + conv_type_bits) == bits, "left justified in byte");
}

void MethodHandles::load_stack_move(MacroAssembler* _masm,
                                    Register rdi_stack_move,
                                    Register rcx_amh,
                                    bool might_be_negative) {
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  BLOCK_COMMENT("load_stack_move {");
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  Address rcx_amh_conversion(rcx_amh, java_lang_invoke_AdapterMethodHandle::conversion_offset_in_bytes());
  __ movl(rdi_stack_move, rcx_amh_conversion);
  __ sarl(rdi_stack_move, CONV_STACK_MOVE_SHIFT);
#ifdef _LP64
  if (might_be_negative) {
    // clean high bits of stack motion register (was loaded as an int)
    __ movslq(rdi_stack_move, rdi_stack_move);
  }
#endif //_LP64
  if (VerifyMethodHandles) {
    Label L_ok, L_bad;
    int32_t stack_move_limit = 0x4000;  // extra-large
    __ cmpptr(rdi_stack_move, stack_move_limit);
    __ jcc(Assembler::greaterEqual, L_bad);
    __ cmpptr(rdi_stack_move, -stack_move_limit);
    __ jcc(Assembler::greater, L_ok);
    __ bind(L_bad);
    __ stop("load_stack_move of garbage value");
    __ BIND(L_ok);
  }
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  BLOCK_COMMENT("} load_stack_move");
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}

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#ifdef ASSERT
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void MethodHandles::RicochetFrame::verify_offsets() {
  // Check compatibility of this struct with the more generally used offsets of class frame:
  int ebp_off = sender_link_offset_in_bytes();  // offset from struct base to local rbp value
  assert(ebp_off + wordSize*frame::interpreter_frame_method_offset      == saved_args_base_offset_in_bytes(), "");
  assert(ebp_off + wordSize*frame::interpreter_frame_last_sp_offset     == conversion_offset_in_bytes(), "");
  assert(ebp_off + wordSize*frame::interpreter_frame_sender_sp_offset   == exact_sender_sp_offset_in_bytes(), "");
  // These last two have to be exact:
  assert(ebp_off + wordSize*frame::link_offset                          == sender_link_offset_in_bytes(), "");
  assert(ebp_off + wordSize*frame::return_addr_offset                   == sender_pc_offset_in_bytes(), "");
}

void MethodHandles::RicochetFrame::verify() const {
  verify_offsets();
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  assert(magic_number_1() == MAGIC_NUMBER_1, err_msg(PTR_FORMAT " == " PTR_FORMAT, magic_number_1(), MAGIC_NUMBER_1));
  assert(magic_number_2() == MAGIC_NUMBER_2, err_msg(PTR_FORMAT " == " PTR_FORMAT, magic_number_2(), MAGIC_NUMBER_2));
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  if (!Universe::heap()->is_gc_active()) {
    if (saved_args_layout() != NULL) {
      assert(saved_args_layout()->is_method(), "must be valid oop");
    }
    if (saved_target() != NULL) {
      assert(java_lang_invoke_MethodHandle::is_instance(saved_target()), "checking frame value");
    }
  }
  int conv_op = adapter_conversion_op(conversion());
  assert(conv_op == java_lang_invoke_AdapterMethodHandle::OP_COLLECT_ARGS ||
         conv_op == java_lang_invoke_AdapterMethodHandle::OP_FOLD_ARGS ||
         conv_op == java_lang_invoke_AdapterMethodHandle::OP_PRIM_TO_REF,
         "must be a sane conversion");
  if (has_return_value_slot()) {
    assert(*return_value_slot_addr() == RETURN_VALUE_PLACEHOLDER, "");
  }
}
#endif //PRODUCT

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#ifdef ASSERT
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void MethodHandles::verify_argslot(MacroAssembler* _masm,
                                   Register argslot_reg,
                                   const char* error_message) {
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  // Verify that argslot lies within (rsp, rbp].
  Label L_ok, L_bad;
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  BLOCK_COMMENT("verify_argslot {");
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  __ cmpptr(argslot_reg, rbp);
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  __ jccb(Assembler::above, L_bad);
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  __ cmpptr(rsp, argslot_reg);
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  __ jccb(Assembler::below, L_ok);
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  __ bind(L_bad);
  __ stop(error_message);
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  __ BIND(L_ok);
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  BLOCK_COMMENT("} verify_argslot");
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}

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void MethodHandles::verify_argslots(MacroAssembler* _masm,
                                    RegisterOrConstant arg_slots,
                                    Register arg_slot_base_reg,
                                    bool negate_argslots,
                                    const char* error_message) {
  // Verify that [argslot..argslot+size) lies within (rsp, rbp).
  Label L_ok, L_bad;
  Register rdi_temp = rdi;
  BLOCK_COMMENT("verify_argslots {");
  __ push(rdi_temp);
  if (negate_argslots) {
    if (arg_slots.is_constant()) {
      arg_slots = -1 * arg_slots.as_constant();
    } else {
      __ movptr(rdi_temp, arg_slots);
      __ negptr(rdi_temp);
      arg_slots = rdi_temp;
    }
  }
  __ lea(rdi_temp, Address(arg_slot_base_reg, arg_slots, Interpreter::stackElementScale()));
  __ cmpptr(rdi_temp, rbp);
  __ pop(rdi_temp);
  __ jcc(Assembler::above, L_bad);
  __ cmpptr(rsp, arg_slot_base_reg);
  __ jcc(Assembler::below, L_ok);
  __ bind(L_bad);
  __ stop(error_message);
  __ BIND(L_ok);
  BLOCK_COMMENT("} verify_argslots");
}

// Make sure that arg_slots has the same sign as the given direction.
// If (and only if) arg_slots is a assembly-time constant, also allow it to be zero.
void MethodHandles::verify_stack_move(MacroAssembler* _masm,
                                      RegisterOrConstant arg_slots, int direction) {
  bool allow_zero = arg_slots.is_constant();
  if (direction == 0) { direction = +1; allow_zero = true; }
  assert(stack_move_unit() == -1, "else add extra checks here");
  if (arg_slots.is_register()) {
    Label L_ok, L_bad;
    BLOCK_COMMENT("verify_stack_move {");
    // testl(arg_slots.as_register(), -stack_move_unit() - 1);  // no need
    // jcc(Assembler::notZero, L_bad);
    __ cmpptr(arg_slots.as_register(), (int32_t) NULL_WORD);
    if (direction > 0) {
      __ jcc(allow_zero ? Assembler::less : Assembler::lessEqual, L_bad);
      __ cmpptr(arg_slots.as_register(), (int32_t) UNREASONABLE_STACK_MOVE);
      __ jcc(Assembler::less, L_ok);
    } else {
      __ jcc(allow_zero ? Assembler::greater : Assembler::greaterEqual, L_bad);
      __ cmpptr(arg_slots.as_register(), (int32_t) -UNREASONABLE_STACK_MOVE);
      __ jcc(Assembler::greater, L_ok);
    }
    __ bind(L_bad);
    if (direction > 0)
      __ stop("assert arg_slots > 0");
    else
      __ stop("assert arg_slots < 0");
    __ BIND(L_ok);
    BLOCK_COMMENT("} verify_stack_move");
  } else {
    intptr_t size = arg_slots.as_constant();
    if (direction < 0)  size = -size;
    assert(size >= 0, "correct direction of constant move");
    assert(size < UNREASONABLE_STACK_MOVE, "reasonable size of constant move");
  }
}

void MethodHandles::verify_klass(MacroAssembler* _masm,
                                 Register obj, KlassHandle klass,
                                 const char* error_message) {
  oop* klass_addr = klass.raw_value();
  assert(klass_addr >= SystemDictionaryHandles::Object_klass().raw_value() &&
         klass_addr <= SystemDictionaryHandles::Long_klass().raw_value(),
         "must be one of the SystemDictionaryHandles");
  Register temp = rdi;
  Label L_ok, L_bad;
  BLOCK_COMMENT("verify_klass {");
  __ verify_oop(obj);
  __ testptr(obj, obj);
  __ jcc(Assembler::zero, L_bad);
  __ push(temp);
  __ load_klass(temp, obj);
  __ cmpptr(temp, ExternalAddress((address) klass_addr));
  __ jcc(Assembler::equal, L_ok);
  intptr_t super_check_offset = klass->super_check_offset();
  __ movptr(temp, Address(temp, super_check_offset));
  __ cmpptr(temp, ExternalAddress((address) klass_addr));
  __ jcc(Assembler::equal, L_ok);
  __ pop(temp);
  __ bind(L_bad);
  __ stop(error_message);
  __ BIND(L_ok);
  __ pop(temp);
  BLOCK_COMMENT("} verify_klass");
}
#endif //ASSERT
548

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void MethodHandles::jump_from_method_handle(MacroAssembler* _masm, Register method, Register temp) {
  if (JvmtiExport::can_post_interpreter_events()) {
    Label run_compiled_code;
    // JVMTI events, such as single-stepping, are implemented partly by avoiding running
    // compiled code in threads for which the event is enabled.  Check here for
    // interp_only_mode if these events CAN be enabled.
#ifdef _LP64
    Register rthread = r15_thread;
#else
    Register rthread = temp;
    __ get_thread(rthread);
#endif
    // interp_only is an int, on little endian it is sufficient to test the byte only
    // Is a cmpl faster?
    __ cmpb(Address(rthread, JavaThread::interp_only_mode_offset()), 0);
    __ jccb(Assembler::zero, run_compiled_code);
    __ jmp(Address(method, methodOopDesc::interpreter_entry_offset()));
    __ bind(run_compiled_code);
  }
  __ jmp(Address(method, methodOopDesc::from_interpreted_offset()));
}

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// Code generation
address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm) {
  // rbx: methodOop
  // rcx: receiver method handle (must load from sp[MethodTypeForm.vmslots])
  // rsi/r13: sender SP (must preserve; see prepare_to_jump_from_interpreted)
576
  // rdx, rdi: garbage temp, blown away
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  Register rbx_method = rbx;
  Register rcx_recv   = rcx;
  Register rax_mtype  = rax;
  Register rdx_temp   = rdx;
582
  Register rdi_temp   = rdi;
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  // emit WrongMethodType path first, to enable jccb back-branch from main path
  Label wrong_method_type;
  __ bind(wrong_method_type);
587
  Label invoke_generic_slow_path, invoke_exact_error_path;
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  assert(methodOopDesc::intrinsic_id_size_in_bytes() == sizeof(u1), "");;
  __ cmpb(Address(rbx_method, methodOopDesc::intrinsic_id_offset_in_bytes()), (int) vmIntrinsics::_invokeExact);
  __ jcc(Assembler::notEqual, invoke_generic_slow_path);
591
  __ jmp(invoke_exact_error_path);
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  // here's where control starts out:
  __ align(CodeEntryAlignment);
  address entry_point = __ pc();

  // fetch the MethodType from the method handle into rax (the 'check' register)
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  // FIXME: Interpreter should transmit pre-popped stack pointer, to locate base of arg list.
  // This would simplify several touchy bits of code.
  // See 6984712: JSR 292 method handle calls need a clean argument base pointer
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  {
    Register tem = rbx_method;
    for (jint* pchase = methodOopDesc::method_type_offsets_chain(); (*pchase) != -1; pchase++) {
      __ movptr(rax_mtype, Address(tem, *pchase));
      tem = rax_mtype;          // in case there is another indirection
    }
  }

  // given the MethodType, find out where the MH argument is buried
610
  __ load_heap_oop(rdx_temp, Address(rax_mtype, __ delayed_value(java_lang_invoke_MethodType::form_offset_in_bytes, rdi_temp)));
611
  Register rdx_vmslots = rdx_temp;
612
  __ movl(rdx_vmslots, Address(rdx_temp, __ delayed_value(java_lang_invoke_MethodTypeForm::vmslots_offset_in_bytes, rdi_temp)));
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  Address mh_receiver_slot_addr = __ argument_address(rdx_vmslots);
  __ movptr(rcx_recv, mh_receiver_slot_addr);
615

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  trace_method_handle(_masm, "invokeExact");

  __ check_method_handle_type(rax_mtype, rcx_recv, rdi_temp, wrong_method_type);
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  // Nobody uses the MH receiver slot after this.  Make sure.
  DEBUG_ONLY(__ movptr(mh_receiver_slot_addr, (int32_t)0x999999));

623 624
  __ jump_to_method_handle_entry(rcx_recv, rdi_temp);

625 626
  // error path for invokeExact (only)
  __ bind(invoke_exact_error_path);
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  // ensure that the top of stack is properly aligned.
  __ mov(rdi, rsp);
  __ andptr(rsp, -StackAlignmentInBytes); // Align the stack for the ABI
  __ pushptr(Address(rdi, 0));  // Pick up the return address

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  // Stub wants expected type in rax and the actual type in rcx
  __ jump(ExternalAddress(StubRoutines::throw_WrongMethodTypeException_entry()));
634

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  // for invokeGeneric (only), apply argument and result conversions on the fly
  __ bind(invoke_generic_slow_path);
#ifdef ASSERT
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  if (VerifyMethodHandles) {
    Label L;
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    __ cmpb(Address(rbx_method, methodOopDesc::intrinsic_id_offset_in_bytes()), (int) vmIntrinsics::_invokeGeneric);
    __ jcc(Assembler::equal, L);
    __ stop("bad methodOop::intrinsic_id");
    __ bind(L);
  }
#endif //ASSERT
  Register rbx_temp = rbx_method;  // don't need it now

  // make room on the stack for another pointer:
  Register rcx_argslot = rcx_recv;
  __ lea(rcx_argslot, __ argument_address(rdx_vmslots, 1));
651
  insert_arg_slots(_masm, 2 * stack_move_unit(),
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                   rcx_argslot, rbx_temp, rdx_temp);

  // load up an adapter from the calling type (Java weaves this)
  Register rdx_adapter = rdx_temp;
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  __ load_heap_oop(rdx_temp,    Address(rax_mtype, __ delayed_value(java_lang_invoke_MethodType::form_offset_in_bytes,               rdi_temp)));
  __ load_heap_oop(rdx_adapter, Address(rdx_temp,  __ delayed_value(java_lang_invoke_MethodTypeForm::genericInvoker_offset_in_bytes, rdi_temp)));
  __ verify_oop(rdx_adapter);
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  __ movptr(Address(rcx_argslot, 1 * Interpreter::stackElementSize), rdx_adapter);
  // As a trusted first argument, pass the type being called, so the adapter knows
  // the actual types of the arguments and return values.
  // (Generic invokers are shared among form-families of method-type.)
  __ movptr(Address(rcx_argslot, 0 * Interpreter::stackElementSize), rax_mtype);
  // FIXME: assert that rdx_adapter is of the right method-type.
  __ mov(rcx, rdx_adapter);
  trace_method_handle(_masm, "invokeGeneric");
  __ jump_to_method_handle_entry(rcx, rdi_temp);

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  return entry_point;
}

// Helper to insert argument slots into the stack.
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// arg_slots must be a multiple of stack_move_unit() and < 0
// rax_argslot is decremented to point to the new (shifted) location of the argslot
// But, rdx_temp ends up holding the original value of rax_argslot.
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void MethodHandles::insert_arg_slots(MacroAssembler* _masm,
                                     RegisterOrConstant arg_slots,
                                     Register rax_argslot,
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                                     Register rbx_temp, Register rdx_temp) {
  // allow constant zero
  if (arg_slots.is_constant() && arg_slots.as_constant() == 0)
    return;
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  assert_different_registers(rax_argslot, rbx_temp, rdx_temp,
                             (!arg_slots.is_register() ? rsp : arg_slots.as_register()));
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  if (VerifyMethodHandles)
    verify_argslot(_masm, rax_argslot, "insertion point must fall within current frame");
  if (VerifyMethodHandles)
    verify_stack_move(_masm, arg_slots, -1);
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  // Make space on the stack for the inserted argument(s).
  // Then pull down everything shallower than rax_argslot.
  // The stacked return address gets pulled down with everything else.
  // That is, copy [rsp, argslot) downward by -size words.  In pseudo-code:
  //   rsp -= size;
  //   for (rdx = rsp + size; rdx < argslot; rdx++)
  //     rdx[-size] = rdx[0]
  //   argslot -= size;
698
  BLOCK_COMMENT("insert_arg_slots {");
699
  __ mov(rdx_temp, rsp);                        // source pointer for copy
700
  __ lea(rsp, Address(rsp, arg_slots, Interpreter::stackElementScale()));
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  {
    Label loop;
703
    __ BIND(loop);
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    // pull one word down each time through the loop
    __ movptr(rbx_temp, Address(rdx_temp, 0));
706
    __ movptr(Address(rdx_temp, arg_slots, Interpreter::stackElementScale()), rbx_temp);
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    __ addptr(rdx_temp, wordSize);
    __ cmpptr(rdx_temp, rax_argslot);
709
    __ jcc(Assembler::below, loop);
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  }

  // Now move the argslot down, to point to the opened-up space.
713
  __ lea(rax_argslot, Address(rax_argslot, arg_slots, Interpreter::stackElementScale()));
714
  BLOCK_COMMENT("} insert_arg_slots");
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}

// Helper to remove argument slots from the stack.
718
// arg_slots must be a multiple of stack_move_unit() and > 0
719
void MethodHandles::remove_arg_slots(MacroAssembler* _masm,
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                                     RegisterOrConstant arg_slots,
                                     Register rax_argslot,
                                     Register rbx_temp, Register rdx_temp) {
  // allow constant zero
  if (arg_slots.is_constant() && arg_slots.as_constant() == 0)
    return;
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  assert_different_registers(rax_argslot, rbx_temp, rdx_temp,
                             (!arg_slots.is_register() ? rsp : arg_slots.as_register()));
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  if (VerifyMethodHandles)
    verify_argslots(_masm, arg_slots, rax_argslot, false,
                    "deleted argument(s) must fall within current frame");
  if (VerifyMethodHandles)
    verify_stack_move(_masm, arg_slots, +1);
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  BLOCK_COMMENT("remove_arg_slots {");
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  // Pull up everything shallower than rax_argslot.
  // Then remove the excess space on the stack.
  // The stacked return address gets pulled up with everything else.
  // That is, copy [rsp, argslot) upward by size words.  In pseudo-code:
  //   for (rdx = argslot-1; rdx >= rsp; --rdx)
  //     rdx[size] = rdx[0]
  //   argslot += size;
  //   rsp += size;
  __ lea(rdx_temp, Address(rax_argslot, -wordSize)); // source pointer for copy
  {
    Label loop;
746
    __ BIND(loop);
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    // pull one word up each time through the loop
    __ movptr(rbx_temp, Address(rdx_temp, 0));
749
    __ movptr(Address(rdx_temp, arg_slots, Interpreter::stackElementScale()), rbx_temp);
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    __ addptr(rdx_temp, -wordSize);
    __ cmpptr(rdx_temp, rsp);
752
    __ jcc(Assembler::aboveEqual, loop);
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  }

  // Now move the argslot up, to point to the just-copied block.
756
  __ lea(rsp, Address(rsp, arg_slots, Interpreter::stackElementScale()));
757
  // And adjust the argslot address to point at the deletion point.
758
  __ lea(rax_argslot, Address(rax_argslot, arg_slots, Interpreter::stackElementScale()));
759
  BLOCK_COMMENT("} remove_arg_slots");
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}

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// Helper to copy argument slots to the top of the stack.
// The sequence starts with rax_argslot and is counted by slot_count
// slot_count must be a multiple of stack_move_unit() and >= 0
// This function blows the temps but does not change rax_argslot.
void MethodHandles::push_arg_slots(MacroAssembler* _masm,
                                   Register rax_argslot,
                                   RegisterOrConstant slot_count,
                                   int skip_words_count,
                                   Register rbx_temp, Register rdx_temp) {
  assert_different_registers(rax_argslot, rbx_temp, rdx_temp,
                             (!slot_count.is_register() ? rbp : slot_count.as_register()),
                             rsp);
  assert(Interpreter::stackElementSize == wordSize, "else change this code");

  if (VerifyMethodHandles)
    verify_stack_move(_masm, slot_count, 0);

  // allow constant zero
  if (slot_count.is_constant() && slot_count.as_constant() == 0)
    return;

  BLOCK_COMMENT("push_arg_slots {");

  Register rbx_top = rbx_temp;

  // There is at most 1 word to carry down with the TOS.
  switch (skip_words_count) {
  case 1: __ pop(rdx_temp); break;
  case 0:                   break;
  default: ShouldNotReachHere();
  }

  if (slot_count.is_constant()) {
    for (int i = slot_count.as_constant() - 1; i >= 0; i--) {
      __ pushptr(Address(rax_argslot, i * wordSize));
    }
  } else {
    Label L_plural, L_loop, L_break;
    // Emit code to dynamically check for the common cases, zero and one slot.
    __ cmpl(slot_count.as_register(), (int32_t) 1);
    __ jccb(Assembler::greater, L_plural);
    __ jccb(Assembler::less, L_break);
    __ pushptr(Address(rax_argslot, 0));
    __ jmpb(L_break);
    __ BIND(L_plural);

    // Loop for 2 or more:
    //   rbx = &rax[slot_count]
    //   while (rbx > rax)  *(--rsp) = *(--rbx)
    __ lea(rbx_top, Address(rax_argslot, slot_count, Address::times_ptr));
    __ BIND(L_loop);
    __ subptr(rbx_top, wordSize);
    __ pushptr(Address(rbx_top, 0));
    __ cmpptr(rbx_top, rax_argslot);
    __ jcc(Assembler::above, L_loop);
    __ bind(L_break);
  }
  switch (skip_words_count) {
  case 1: __ push(rdx_temp); break;
  case 0:                    break;
  default: ShouldNotReachHere();
  }
  BLOCK_COMMENT("} push_arg_slots");
}

// in-place movement; no change to rsp
// blows rax_temp, rdx_temp
void MethodHandles::move_arg_slots_up(MacroAssembler* _masm,
                                      Register rbx_bottom,  // invariant
                                      Address  top_addr,     // can use rax_temp
                                      RegisterOrConstant positive_distance_in_slots,
                                      Register rax_temp, Register rdx_temp) {
  BLOCK_COMMENT("move_arg_slots_up {");
  assert_different_registers(rbx_bottom,
                             rax_temp, rdx_temp,
                             positive_distance_in_slots.register_or_noreg());
  Label L_loop, L_break;
  Register rax_top = rax_temp;
  if (!top_addr.is_same_address(Address(rax_top, 0)))
    __ lea(rax_top, top_addr);
  // Detect empty (or broken) loop:
#ifdef ASSERT
  if (VerifyMethodHandles) {
    // Verify that &bottom < &top (non-empty interval)
    Label L_ok, L_bad;
    if (positive_distance_in_slots.is_register()) {
      __ cmpptr(positive_distance_in_slots.as_register(), (int32_t) 0);
      __ jcc(Assembler::lessEqual, L_bad);
    }
    __ cmpptr(rbx_bottom, rax_top);
    __ jcc(Assembler::below, L_ok);
    __ bind(L_bad);
    __ stop("valid bounds (copy up)");
    __ BIND(L_ok);
  }
#endif
  __ cmpptr(rbx_bottom, rax_top);
  __ jccb(Assembler::aboveEqual, L_break);
  // work rax down to rbx, copying contiguous data upwards
  // In pseudo-code:
  //   [rbx, rax) = &[bottom, top)
  //   while (--rax >= rbx) *(rax + distance) = *(rax + 0), rax--;
  __ BIND(L_loop);
  __ subptr(rax_top, wordSize);
  __ movptr(rdx_temp, Address(rax_top, 0));
  __ movptr(          Address(rax_top, positive_distance_in_slots, Address::times_ptr), rdx_temp);
  __ cmpptr(rax_top, rbx_bottom);
  __ jcc(Assembler::above, L_loop);
  assert(Interpreter::stackElementSize == wordSize, "else change loop");
  __ bind(L_break);
  BLOCK_COMMENT("} move_arg_slots_up");
}

// in-place movement; no change to rsp
// blows rax_temp, rdx_temp
void MethodHandles::move_arg_slots_down(MacroAssembler* _masm,
                                        Address  bottom_addr,  // can use rax_temp
                                        Register rbx_top,      // invariant
                                        RegisterOrConstant negative_distance_in_slots,
                                        Register rax_temp, Register rdx_temp) {
  BLOCK_COMMENT("move_arg_slots_down {");
  assert_different_registers(rbx_top,
                             negative_distance_in_slots.register_or_noreg(),
                             rax_temp, rdx_temp);
  Label L_loop, L_break;
  Register rax_bottom = rax_temp;
  if (!bottom_addr.is_same_address(Address(rax_bottom, 0)))
    __ lea(rax_bottom, bottom_addr);
  // Detect empty (or broken) loop:
#ifdef ASSERT
  assert(!negative_distance_in_slots.is_constant() || negative_distance_in_slots.as_constant() < 0, "");
  if (VerifyMethodHandles) {
    // Verify that &bottom < &top (non-empty interval)
    Label L_ok, L_bad;
    if (negative_distance_in_slots.is_register()) {
      __ cmpptr(negative_distance_in_slots.as_register(), (int32_t) 0);
      __ jcc(Assembler::greaterEqual, L_bad);
    }
    __ cmpptr(rax_bottom, rbx_top);
    __ jcc(Assembler::below, L_ok);
    __ bind(L_bad);
    __ stop("valid bounds (copy down)");
    __ BIND(L_ok);
  }
#endif
  __ cmpptr(rax_bottom, rbx_top);
  __ jccb(Assembler::aboveEqual, L_break);
  // work rax up to rbx, copying contiguous data downwards
  // In pseudo-code:
  //   [rax, rbx) = &[bottom, top)
  //   while (rax < rbx) *(rax - distance) = *(rax + 0), rax++;
  __ BIND(L_loop);
  __ movptr(rdx_temp, Address(rax_bottom, 0));
  __ movptr(          Address(rax_bottom, negative_distance_in_slots, Address::times_ptr), rdx_temp);
  __ addptr(rax_bottom, wordSize);
  __ cmpptr(rax_bottom, rbx_top);
  __ jcc(Assembler::below, L_loop);
  assert(Interpreter::stackElementSize == wordSize, "else change loop");
  __ bind(L_break);
  BLOCK_COMMENT("} move_arg_slots_down");
}

// Copy from a field or array element to a stacked argument slot.
// is_element (ignored) says whether caller is loading an array element instead of an instance field.
void MethodHandles::move_typed_arg(MacroAssembler* _masm,
                                   BasicType type, bool is_element,
                                   Address slot_dest, Address value_src,
                                   Register rbx_temp, Register rdx_temp) {
  BLOCK_COMMENT(!is_element ? "move_typed_arg {" : "move_typed_arg { (array element)");
  if (type == T_OBJECT || type == T_ARRAY) {
    __ load_heap_oop(rbx_temp, value_src);
    __ movptr(slot_dest, rbx_temp);
  } else if (type != T_VOID) {
    int  arg_size      = type2aelembytes(type);
    bool arg_is_signed = is_signed_subword_type(type);
    int  slot_size     = (arg_size > wordSize) ? arg_size : wordSize;
    __ load_sized_value(  rdx_temp,  value_src, arg_size, arg_is_signed, rbx_temp);
    __ store_sized_value( slot_dest, rdx_temp,  slot_size,               rbx_temp);
  }
  BLOCK_COMMENT("} move_typed_arg");
}

void MethodHandles::move_return_value(MacroAssembler* _masm, BasicType type,
                                      Address return_slot) {
  BLOCK_COMMENT("move_return_value {");
  // Old versions of the JVM must clean the FPU stack after every return.
#ifndef _LP64
#ifdef COMPILER2
  // The FPU stack is clean if UseSSE >= 2 but must be cleaned in other cases
  if ((type == T_FLOAT && UseSSE < 1) || (type == T_DOUBLE && UseSSE < 2)) {
    for (int i = 1; i < 8; i++) {
        __ ffree(i);
    }
  } else if (UseSSE < 2) {
    __ empty_FPU_stack();
  }
#endif //COMPILER2
#endif //!_LP64

  // Look at the type and pull the value out of the corresponding register.
  if (type == T_VOID) {
    // nothing to do
  } else if (type == T_OBJECT) {
    __ movptr(return_slot, rax);
  } else if (type == T_INT || is_subword_type(type)) {
    // write the whole word, even if only 32 bits is significant
    __ movptr(return_slot, rax);
  } else if (type == T_LONG) {
    // store the value by parts
    // Note: We assume longs are continguous (if misaligned) on the interpreter stack.
    __ store_sized_value(return_slot, rax, BytesPerLong, rdx);
  } else if (NOT_LP64((type == T_FLOAT  && UseSSE < 1) ||
                      (type == T_DOUBLE && UseSSE < 2) ||)
             false) {
    // Use old x86 FPU registers:
    if (type == T_FLOAT)
      __ fstp_s(return_slot);
    else
      __ fstp_d(return_slot);
  } else if (type == T_FLOAT) {
    __ movflt(return_slot, xmm0);
  } else if (type == T_DOUBLE) {
    __ movdbl(return_slot, xmm0);
  } else {
    ShouldNotReachHere();
  }
  BLOCK_COMMENT("} move_return_value");
}


992
#ifndef PRODUCT
993
extern "C" void print_method_handle(oop mh);
994
void trace_method_handle_stub(const char* adaptername,
995
                              oop mh,
996 997 998 999
                              intptr_t* saved_regs,
                              intptr_t* entry_sp,
                              intptr_t* saved_sp,
                              intptr_t* saved_bp) {
1000
  // called as a leaf from native code: do not block the JVM!
1001
  bool has_mh = (strstr(adaptername, "return/") == NULL);  // return adapters don't have rcx_mh
1002
  intptr_t* last_sp = (intptr_t*) saved_bp[frame::interpreter_frame_last_sp_offset];
1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015
  intptr_t* base_sp = last_sp;
  typedef MethodHandles::RicochetFrame RicochetFrame;
  RicochetFrame* rfp = (RicochetFrame*)((address)saved_bp - RicochetFrame::sender_link_offset_in_bytes());
  if (!UseRicochetFrames || Universe::heap()->is_in((address) rfp->saved_args_base())) {
    // Probably an interpreter frame.
    base_sp = (intptr_t*) saved_bp[frame::interpreter_frame_monitor_block_top_offset];
  }
  intptr_t    mh_reg = (intptr_t)mh;
  const char* mh_reg_name = "rcx_mh";
  if (!has_mh)  mh_reg_name = "rcx";
  tty->print_cr("MH %s %s="PTR_FORMAT" sp=("PTR_FORMAT"+"INTX_FORMAT") stack_size="INTX_FORMAT" bp="PTR_FORMAT,
                adaptername, mh_reg_name, mh_reg,
                (intptr_t)entry_sp, (intptr_t)(saved_sp - entry_sp), (intptr_t)(base_sp - last_sp), (intptr_t)saved_bp);
1016
  if (Verbose) {
1017 1018 1019 1020 1021 1022 1023 1024 1025
    tty->print(" reg dump: ");
    int saved_regs_count = (entry_sp-1) - saved_regs;
    // 32 bit: rdi rsi rbp rsp; rbx rdx rcx (*) rax
    int i;
    for (i = 0; i <= saved_regs_count; i++) {
      if (i > 0 && i % 4 == 0 && i != saved_regs_count) {
        tty->cr();
        tty->print("   + dump: ");
      }
1026
      tty->print(" %d: "PTR_FORMAT, i, saved_regs[i]);
1027 1028
    }
    tty->cr();
1029 1030
    if (last_sp != saved_sp && last_sp != NULL)
      tty->print_cr("*** last_sp="PTR_FORMAT, (intptr_t)last_sp);
1031 1032 1033 1034 1035
    int stack_dump_count = 16;
    if (stack_dump_count < (int)(saved_bp + 2 - saved_sp))
      stack_dump_count = (int)(saved_bp + 2 - saved_sp);
    if (stack_dump_count > 64)  stack_dump_count = 48;
    for (i = 0; i < stack_dump_count; i += 4) {
1036
      tty->print_cr(" dump at SP[%d] "PTR_FORMAT": "PTR_FORMAT" "PTR_FORMAT" "PTR_FORMAT" "PTR_FORMAT,
1037 1038
                    i, (intptr_t) &entry_sp[i+0], entry_sp[i+0], entry_sp[i+1], entry_sp[i+2], entry_sp[i+3]);
    }
1039 1040
    if (has_mh)
      print_method_handle(mh);
1041 1042
  }
}
1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063

// The stub wraps the arguments in a struct on the stack to avoid
// dealing with the different calling conventions for passing 6
// arguments.
struct MethodHandleStubArguments {
  const char* adaptername;
  oopDesc* mh;
  intptr_t* saved_regs;
  intptr_t* entry_sp;
  intptr_t* saved_sp;
  intptr_t* saved_bp;
};
void trace_method_handle_stub_wrapper(MethodHandleStubArguments* args) {
  trace_method_handle_stub(args->adaptername,
                           args->mh,
                           args->saved_regs,
                           args->entry_sp,
                           args->saved_sp,
                           args->saved_bp);
}

1064 1065 1066
void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) {
  if (!TraceMethodHandles)  return;
  BLOCK_COMMENT("trace_method_handle {");
1067 1068
  __ push(rax);
  __ lea(rax, Address(rsp, wordSize * NOT_LP64(6) LP64_ONLY(14))); // entry_sp  __ pusha();
1069
  __ pusha();
1070 1071 1072
  __ mov(rbx, rsp);
  __ enter();
  // incoming state:
1073
  // rcx: method handle
1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084
  // r13 or rsi: saved sp
  // To avoid calling convention issues, build a record on the stack and pass the pointer to that instead.
  __ push(rbp);               // saved_bp
  __ push(rsi);               // saved_sp
  __ push(rax);               // entry_sp
  __ push(rbx);               // pusha saved_regs
  __ push(rcx);               // mh
  __ push(rcx);               // adaptername
  __ movptr(Address(rsp, 0), (intptr_t) adaptername);
  __ super_call_VM_leaf(CAST_FROM_FN_PTR(address, trace_method_handle_stub_wrapper), rsp);
  __ leave();
1085
  __ popa();
1086
  __ pop(rax);
1087
  BLOCK_COMMENT("} trace_method_handle");
1088 1089 1090
}
#endif //PRODUCT

1091 1092
// which conversion op types are implemented here?
int MethodHandles::adapter_conversion_ops_supported_mask() {
1093 1094 1095 1096 1097
  return ((1<<java_lang_invoke_AdapterMethodHandle::OP_RETYPE_ONLY)
         |(1<<java_lang_invoke_AdapterMethodHandle::OP_RETYPE_RAW)
         |(1<<java_lang_invoke_AdapterMethodHandle::OP_CHECK_CAST)
         |(1<<java_lang_invoke_AdapterMethodHandle::OP_PRIM_TO_PRIM)
         |(1<<java_lang_invoke_AdapterMethodHandle::OP_REF_TO_PRIM)
1098
          //OP_PRIM_TO_REF is below...
1099 1100 1101 1102
         |(1<<java_lang_invoke_AdapterMethodHandle::OP_SWAP_ARGS)
         |(1<<java_lang_invoke_AdapterMethodHandle::OP_ROT_ARGS)
         |(1<<java_lang_invoke_AdapterMethodHandle::OP_DUP_ARGS)
         |(1<<java_lang_invoke_AdapterMethodHandle::OP_DROP_ARGS)
1103 1104 1105 1106 1107 1108 1109 1110
          //OP_COLLECT_ARGS is below...
         |(1<<java_lang_invoke_AdapterMethodHandle::OP_SPREAD_ARGS)
         |(!UseRicochetFrames ? 0 :
           java_lang_invoke_MethodTypeForm::vmlayout_offset_in_bytes() <= 0 ? 0 :
           ((1<<java_lang_invoke_AdapterMethodHandle::OP_PRIM_TO_REF)
           |(1<<java_lang_invoke_AdapterMethodHandle::OP_COLLECT_ARGS)
           |(1<<java_lang_invoke_AdapterMethodHandle::OP_FOLD_ARGS)
            ))
1111 1112 1113
         );
}

1114 1115 1116
//------------------------------------------------------------------------------
// MethodHandles::generate_method_handle_stub
//
1117 1118
// Generate an "entry" field for a method handle.
// This determines how the method handle will respond to calls.
1119
void MethodHandles::generate_method_handle_stub(MacroAssembler* _masm, MethodHandles::EntryKind ek) {
1120 1121
  MethodHandles::EntryKind ek_orig = ek_original_kind(ek);

1122 1123 1124 1125 1126 1127 1128 1129
  // Here is the register state during an interpreted call,
  // as set up by generate_method_handle_interpreter_entry():
  // - rbx: garbage temp (was MethodHandle.invoke methodOop, unused)
  // - rcx: receiver method handle
  // - rax: method handle type (only used by the check_mtype entry point)
  // - rsi/r13: sender SP (must preserve; see prepare_to_jump_from_interpreted)
  // - rdx: garbage temp, can blow away

1130 1131 1132 1133
  const Register rcx_recv    = rcx;
  const Register rax_argslot = rax;
  const Register rbx_temp    = rbx;
  const Register rdx_temp    = rdx;
1134
  const Register rdi_temp    = rdi;
1135

1136 1137
  // This guy is set up by prepare_to_jump_from_interpreted (from interpreted calls)
  // and gen_c2i_adapter (from compiled calls):
1138
  const Register saved_last_sp = saved_last_sp_register();
1139 1140 1141 1142 1143 1144 1145

  // Argument registers for _raise_exception.
  // 32-bit: Pass first two oop/int args in registers ECX and EDX.
  const Register rarg0_code     = LP64_ONLY(j_rarg0) NOT_LP64(rcx);
  const Register rarg1_actual   = LP64_ONLY(j_rarg1) NOT_LP64(rdx);
  const Register rarg2_required = LP64_ONLY(j_rarg2) NOT_LP64(rdi);
  assert_different_registers(rarg0_code, rarg1_actual, rarg2_required, saved_last_sp);
1146

1147
  guarantee(java_lang_invoke_MethodHandle::vmentry_offset_in_bytes() != 0, "must have offsets");
1148 1149

  // some handy addresses
1150 1151
  Address rcx_mh_vmtarget(    rcx_recv, java_lang_invoke_MethodHandle::vmtarget_offset_in_bytes() );
  Address rcx_dmh_vmindex(    rcx_recv, java_lang_invoke_DirectMethodHandle::vmindex_offset_in_bytes() );
1152

1153 1154
  Address rcx_bmh_vmargslot(  rcx_recv, java_lang_invoke_BoundMethodHandle::vmargslot_offset_in_bytes() );
  Address rcx_bmh_argument(   rcx_recv, java_lang_invoke_BoundMethodHandle::argument_offset_in_bytes() );
1155

1156 1157 1158
  Address rcx_amh_vmargslot(  rcx_recv, java_lang_invoke_AdapterMethodHandle::vmargslot_offset_in_bytes() );
  Address rcx_amh_argument(   rcx_recv, java_lang_invoke_AdapterMethodHandle::argument_offset_in_bytes() );
  Address rcx_amh_conversion( rcx_recv, java_lang_invoke_AdapterMethodHandle::conversion_offset_in_bytes() );
1159 1160
  Address vmarg;                // __ argument_address(vmargslot)

1161 1162
  const int java_mirror_offset = klassOopDesc::klass_part_offset_in_bytes() + Klass::java_mirror_offset_in_bytes();

1163 1164 1165 1166 1167
  if (have_entry(ek)) {
    __ nop();                   // empty stubs make SG sick
    return;
  }

1168 1169 1170 1171 1172 1173 1174
#ifdef ASSERT
  __ push((int32_t) 0xEEEEEEEE);
  __ push((int32_t) (intptr_t) entry_name(ek));
  LP64_ONLY(__ push((int32_t) high((intptr_t) entry_name(ek))));
  __ push((int32_t) 0x33333333);
#endif //ASSERT

1175 1176
  address interp_entry = __ pc();

1177 1178
  trace_method_handle(_masm, entry_name(ek));

1179
  BLOCK_COMMENT(err_msg("Entry %s {", entry_name(ek)));
1180 1181

  switch ((int) ek) {
1182
  case _raise_exception:
1183
    {
1184
      // Not a real MH entry, but rather shared code for raising an
1185 1186
      // exception.  Since we use the compiled entry, arguments are
      // expected in compiler argument registers.
1187
      assert(raise_exception_method(), "must be set");
1188
      assert(raise_exception_method()->from_compiled_entry(), "method must be linked");
1189

1190 1191
      const Register rax_pc = rax;
      __ pop(rax_pc);  // caller PC
1192
      __ mov(rsp, saved_last_sp);  // cut the stack back to where the caller started
1193

1194 1195
      Register rbx_method = rbx_temp;
      __ movptr(rbx_method, ExternalAddress((address) &_raise_exception_method));
1196 1197

      const int jobject_oop_offset = 0;
1198
      __ movptr(rbx_method, Address(rbx_method, jobject_oop_offset));  // dereference the jobject
1199

1200
      __ movptr(saved_last_sp, rsp);
1201 1202 1203
      __ subptr(rsp, 3 * wordSize);
      __ push(rax_pc);         // restore caller PC

1204
      __ movl  (__ argument_address(constant(2)), rarg0_code);
1205 1206 1207
      __ movptr(__ argument_address(constant(1)), rarg1_actual);
      __ movptr(__ argument_address(constant(0)), rarg2_required);
      jump_from_method_handle(_masm, rbx_method, rax);
1208 1209 1210 1211 1212 1213 1214
    }
    break;

  case _invokestatic_mh:
  case _invokespecial_mh:
    {
      Register rbx_method = rbx_temp;
1215
      __ load_heap_oop(rbx_method, rcx_mh_vmtarget); // target is a methodOop
1216 1217 1218 1219 1220 1221 1222 1223 1224 1225
      __ verify_oop(rbx_method);
      // same as TemplateTable::invokestatic or invokespecial,
      // minus the CP setup and profiling:
      if (ek == _invokespecial_mh) {
        // Must load & check the first argument before entering the target method.
        __ load_method_handle_vmslots(rax_argslot, rcx_recv, rdx_temp);
        __ movptr(rcx_recv, __ argument_address(rax_argslot, -1));
        __ null_check(rcx_recv);
        __ verify_oop(rcx_recv);
      }
1226
      jump_from_method_handle(_masm, rbx_method, rax);
1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255
    }
    break;

  case _invokevirtual_mh:
    {
      // same as TemplateTable::invokevirtual,
      // minus the CP setup and profiling:

      // pick out the vtable index and receiver offset from the MH,
      // and then we can discard it:
      __ load_method_handle_vmslots(rax_argslot, rcx_recv, rdx_temp);
      Register rbx_index = rbx_temp;
      __ movl(rbx_index, rcx_dmh_vmindex);
      // Note:  The verifier allows us to ignore rcx_mh_vmtarget.
      __ movptr(rcx_recv, __ argument_address(rax_argslot, -1));
      __ null_check(rcx_recv, oopDesc::klass_offset_in_bytes());

      // get receiver klass
      Register rax_klass = rax_argslot;
      __ load_klass(rax_klass, rcx_recv);
      __ verify_oop(rax_klass);

      // get target methodOop & entry point
      const int base = instanceKlass::vtable_start_offset() * wordSize;
      assert(vtableEntry::size() * wordSize == wordSize, "adjust the scaling in the code below");
      Address vtable_entry_addr(rax_klass,
                                rbx_index, Address::times_ptr,
                                base + vtableEntry::method_offset_in_bytes());
      Register rbx_method = rbx_temp;
1256
      __ movptr(rbx_method, vtable_entry_addr);
1257 1258

      __ verify_oop(rbx_method);
1259
      jump_from_method_handle(_masm, rbx_method, rax);
1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271
    }
    break;

  case _invokeinterface_mh:
    {
      // same as TemplateTable::invokeinterface,
      // minus the CP setup and profiling:

      // pick out the interface and itable index from the MH.
      __ load_method_handle_vmslots(rax_argslot, rcx_recv, rdx_temp);
      Register rdx_intf  = rdx_temp;
      Register rbx_index = rbx_temp;
1272 1273
      __ load_heap_oop(rdx_intf, rcx_mh_vmtarget);
      __ movl(rbx_index, rcx_dmh_vmindex);
1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289
      __ movptr(rcx_recv, __ argument_address(rax_argslot, -1));
      __ null_check(rcx_recv, oopDesc::klass_offset_in_bytes());

      // get receiver klass
      Register rax_klass = rax_argslot;
      __ load_klass(rax_klass, rcx_recv);
      __ verify_oop(rax_klass);

      Register rbx_method = rbx_index;

      // get interface klass
      Label no_such_interface;
      __ verify_oop(rdx_intf);
      __ lookup_interface_method(rax_klass, rdx_intf,
                                 // note: next two args must be the same:
                                 rbx_index, rbx_method,
1290
                                 rdi_temp,
1291 1292 1293
                                 no_such_interface);

      __ verify_oop(rbx_method);
1294
      jump_from_method_handle(_masm, rbx_method, rax);
1295 1296 1297 1298 1299
      __ hlt();

      __ bind(no_such_interface);
      // Throw an exception.
      // For historical reasons, it will be IncompatibleClassChangeError.
1300 1301 1302 1303 1304
      __ mov(rbx_temp, rcx_recv);  // rarg2_required might be RCX
      assert_different_registers(rarg2_required, rbx_temp);
      __ movptr(rarg2_required, Address(rdx_intf, java_mirror_offset));  // required interface
      __ mov(   rarg1_actual,   rbx_temp);                               // bad receiver
      __ movl(  rarg0_code,     (int) Bytecodes::_invokeinterface);      // who is complaining?
1305
      __ jump(ExternalAddress(from_interpreted_entry(_raise_exception)));
1306 1307 1308 1309 1310 1311 1312 1313 1314 1315
    }
    break;

  case _bound_ref_mh:
  case _bound_int_mh:
  case _bound_long_mh:
  case _bound_ref_direct_mh:
  case _bound_int_direct_mh:
  case _bound_long_direct_mh:
    {
1316
      const bool direct_to_method = (ek >= _bound_ref_direct_mh);
1317 1318
      BasicType arg_type  = ek_bound_mh_arg_type(ek);
      int       arg_slots = type2size[arg_type];
1319 1320 1321 1322

      // make room for the new argument:
      __ movl(rax_argslot, rcx_bmh_vmargslot);
      __ lea(rax_argslot, __ argument_address(rax_argslot));
1323

1324
      insert_arg_slots(_masm, arg_slots * stack_move_unit(), rax_argslot, rbx_temp, rdx_temp);
1325 1326

      // store bound argument into the new stack slot:
1327
      __ load_heap_oop(rbx_temp, rcx_bmh_argument);
1328 1329 1330
      if (arg_type == T_OBJECT) {
        __ movptr(Address(rax_argslot, 0), rbx_temp);
      } else {
1331
        Address prim_value_addr(rbx_temp, java_lang_boxing_object::value_offset_in_bytes(arg_type));
1332 1333 1334 1335
        move_typed_arg(_masm, arg_type, false,
                       Address(rax_argslot, 0),
                       prim_value_addr,
                       rbx_temp, rdx_temp);
1336 1337 1338 1339
      }

      if (direct_to_method) {
        Register rbx_method = rbx_temp;
1340
        __ load_heap_oop(rbx_method, rcx_mh_vmtarget);
1341
        __ verify_oop(rbx_method);
1342
        jump_from_method_handle(_masm, rbx_method, rax);
1343
      } else {
1344
        __ load_heap_oop(rcx_recv, rcx_mh_vmtarget);
1345 1346 1347 1348 1349 1350
        __ verify_oop(rcx_recv);
        __ jump_to_method_handle_entry(rcx_recv, rdx_temp);
      }
    }
    break;

1351 1352 1353 1354 1355 1356 1357
  case _adapter_opt_profiling:
    if (java_lang_invoke_CountingMethodHandle::vmcount_offset_in_bytes() != 0) {
      Address rcx_mh_vmcount(rcx_recv, java_lang_invoke_CountingMethodHandle::vmcount_offset_in_bytes());
      __ incrementl(rcx_mh_vmcount);
    }
    // fall through

1358
  case _adapter_retype_only:
1359
  case _adapter_retype_raw:
1360
    // immediately jump to the next MH layer:
1361
    __ load_heap_oop(rcx_recv, rcx_mh_vmtarget);
1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377
    __ verify_oop(rcx_recv);
    __ jump_to_method_handle_entry(rcx_recv, rdx_temp);
    // This is OK when all parameter types widen.
    // It is also OK when a return type narrows.
    break;

  case _adapter_check_cast:
    {
      // temps:
      Register rbx_klass = rbx_temp; // interesting AMH data

      // check a reference argument before jumping to the next layer of MH:
      __ movl(rax_argslot, rcx_amh_vmargslot);
      vmarg = __ argument_address(rax_argslot);

      // What class are we casting to?
1378
      __ load_heap_oop(rbx_klass, rcx_amh_argument); // this is a Class object!
1379
      load_klass_from_Class(_masm, rbx_klass);
1380 1381 1382

      Label done;
      __ movptr(rdx_temp, vmarg);
1383
      __ testptr(rdx_temp, rdx_temp);
1384
      __ jcc(Assembler::zero, done);         // no cast if null
1385 1386 1387 1388 1389
      __ load_klass(rdx_temp, rdx_temp);

      // live at this point:
      // - rbx_klass:  klass required by the target method
      // - rdx_temp:   argument klass to test
1390
      // - rcx_recv:   adapter method handle
1391 1392 1393 1394 1395
      __ check_klass_subtype(rdx_temp, rbx_klass, rax_argslot, done);

      // If we get here, the type check failed!
      // Call the wrong_method_type stub, passing the failing argument type in rax.
      Register rax_mtype = rax_argslot;
1396 1397 1398
      __ movl(rax_argslot, rcx_amh_vmargslot);  // reload argslot field
      __ movptr(rdx_temp, vmarg);

1399 1400 1401 1402
      assert_different_registers(rarg2_required, rdx_temp);
      __ load_heap_oop(rarg2_required, rcx_amh_argument);             // required class
      __ mov(          rarg1_actual,   rdx_temp);                     // bad object
      __ movl(         rarg0_code,     (int) Bytecodes::_checkcast);  // who is complaining?
1403
      __ jump(ExternalAddress(from_interpreted_entry(_raise_exception)));
1404 1405

      __ bind(done);
1406
      // get the new MH:
1407
      __ load_heap_oop(rcx_recv, rcx_mh_vmtarget);
1408 1409 1410 1411 1412 1413
      __ jump_to_method_handle_entry(rcx_recv, rdx_temp);
    }
    break;

  case _adapter_prim_to_prim:
  case _adapter_ref_to_prim:
1414
  case _adapter_prim_to_ref:
1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437
    // handled completely by optimized cases
    __ stop("init_AdapterMethodHandle should not issue this");
    break;

  case _adapter_opt_i2i:        // optimized subcase of adapt_prim_to_prim
//case _adapter_opt_f2i:        // optimized subcase of adapt_prim_to_prim
  case _adapter_opt_l2i:        // optimized subcase of adapt_prim_to_prim
  case _adapter_opt_unboxi:     // optimized subcase of adapt_ref_to_prim
    {
      // perform an in-place conversion to int or an int subword
      __ movl(rax_argslot, rcx_amh_vmargslot);
      vmarg = __ argument_address(rax_argslot);

      switch (ek) {
      case _adapter_opt_i2i:
        __ movl(rdx_temp, vmarg);
        break;
      case _adapter_opt_l2i:
        {
          // just delete the extra slot; on a little-endian machine we keep the first
          __ lea(rax_argslot, __ argument_address(rax_argslot, 1));
          remove_arg_slots(_masm, -stack_move_unit(),
                           rax_argslot, rbx_temp, rdx_temp);
1438
          vmarg = Address(rax_argslot, -Interpreter::stackElementSize);
1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460
          __ movl(rdx_temp, vmarg);
        }
        break;
      case _adapter_opt_unboxi:
        {
          // Load the value up from the heap.
          __ movptr(rdx_temp, vmarg);
          int value_offset = java_lang_boxing_object::value_offset_in_bytes(T_INT);
#ifdef ASSERT
          for (int bt = T_BOOLEAN; bt < T_INT; bt++) {
            if (is_subword_type(BasicType(bt)))
              assert(value_offset == java_lang_boxing_object::value_offset_in_bytes(BasicType(bt)), "");
          }
#endif
          __ null_check(rdx_temp, value_offset);
          __ movl(rdx_temp, Address(rdx_temp, value_offset));
          // We load this as a word.  Because we are little-endian,
          // the low bits will be correct, but the high bits may need cleaning.
          // The vminfo will guide us to clean those bits.
        }
        break;
      default:
T
twisti 已提交
1461
        ShouldNotReachHere();
1462 1463
      }

T
twisti 已提交
1464
      // Do the requested conversion and store the value.
1465
      Register rbx_vminfo = rbx_temp;
1466
      load_conversion_vminfo(_masm, rbx_vminfo, rcx_amh_conversion);
1467 1468

      // get the new MH:
1469
      __ load_heap_oop(rcx_recv, rcx_mh_vmtarget);
1470 1471 1472
      // (now we are done with the old MH)

      // original 32-bit vmdata word must be of this form:
1473 1474
      //    | MBZ:6 | signBitCount:8 | srcDstTypes:8 | conversionOp:8 |
      __ xchgptr(rcx, rbx_vminfo);                // free rcx for shifts
1475 1476 1477
      __ shll(rdx_temp /*, rcx*/);
      Label zero_extend, done;
      __ testl(rcx, CONV_VMINFO_SIGN_FLAG);
1478
      __ jccb(Assembler::zero, zero_extend);
1479 1480 1481

      // this path is taken for int->byte, int->short
      __ sarl(rdx_temp /*, rcx*/);
1482
      __ jmpb(done);
1483 1484 1485 1486 1487 1488

      __ bind(zero_extend);
      // this is taken for int->char
      __ shrl(rdx_temp /*, rcx*/);

      __ bind(done);
T
twisti 已提交
1489
      __ movl(vmarg, rdx_temp);  // Store the value.
1490
      __ xchgptr(rcx, rbx_vminfo);                // restore rcx_recv
1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503

      __ jump_to_method_handle_entry(rcx_recv, rdx_temp);
    }
    break;

  case _adapter_opt_i2l:        // optimized subcase of adapt_prim_to_prim
  case _adapter_opt_unboxl:     // optimized subcase of adapt_ref_to_prim
    {
      // perform an in-place int-to-long or ref-to-long conversion
      __ movl(rax_argslot, rcx_amh_vmargslot);

      // on a little-endian machine we keep the first slot and add another after
      __ lea(rax_argslot, __ argument_address(rax_argslot, 1));
1504
      insert_arg_slots(_masm, stack_move_unit(),
1505
                       rax_argslot, rbx_temp, rdx_temp);
1506 1507
      Address vmarg1(rax_argslot, -Interpreter::stackElementSize);
      Address vmarg2 = vmarg1.plus_disp(Interpreter::stackElementSize);
1508 1509 1510 1511

      switch (ek) {
      case _adapter_opt_i2l:
        {
1512 1513 1514 1515
#ifdef _LP64
          __ movslq(rdx_temp, vmarg1);  // Load sign-extended
          __ movq(vmarg1, rdx_temp);    // Store into first slot
#else
1516
          __ movl(rdx_temp, vmarg1);
1517
          __ sarl(rdx_temp, BitsPerInt - 1);  // __ extend_sign()
1518
          __ movl(vmarg2, rdx_temp); // store second word
1519
#endif
1520 1521 1522 1523 1524 1525 1526 1527 1528
        }
        break;
      case _adapter_opt_unboxl:
        {
          // Load the value up from the heap.
          __ movptr(rdx_temp, vmarg1);
          int value_offset = java_lang_boxing_object::value_offset_in_bytes(T_LONG);
          assert(value_offset == java_lang_boxing_object::value_offset_in_bytes(T_DOUBLE), "");
          __ null_check(rdx_temp, value_offset);
1529 1530 1531 1532
#ifdef _LP64
          __ movq(rbx_temp, Address(rdx_temp, value_offset));
          __ movq(vmarg1, rbx_temp);
#else
1533 1534 1535 1536
          __ movl(rbx_temp, Address(rdx_temp, value_offset + 0*BytesPerInt));
          __ movl(rdx_temp, Address(rdx_temp, value_offset + 1*BytesPerInt));
          __ movl(vmarg1, rbx_temp);
          __ movl(vmarg2, rdx_temp);
1537
#endif
1538 1539 1540
        }
        break;
      default:
T
twisti 已提交
1541
        ShouldNotReachHere();
1542 1543
      }

1544
      __ load_heap_oop(rcx_recv, rcx_mh_vmtarget);
1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555
      __ jump_to_method_handle_entry(rcx_recv, rdx_temp);
    }
    break;

  case _adapter_opt_f2d:        // optimized subcase of adapt_prim_to_prim
  case _adapter_opt_d2f:        // optimized subcase of adapt_prim_to_prim
    {
      // perform an in-place floating primitive conversion
      __ movl(rax_argslot, rcx_amh_vmargslot);
      __ lea(rax_argslot, __ argument_address(rax_argslot, 1));
      if (ek == _adapter_opt_f2d) {
1556
        insert_arg_slots(_masm, stack_move_unit(),
1557 1558
                         rax_argslot, rbx_temp, rdx_temp);
      }
1559
      Address vmarg(rax_argslot, -Interpreter::stackElementSize);
1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573

#ifdef _LP64
      if (ek == _adapter_opt_f2d) {
        __ movflt(xmm0, vmarg);
        __ cvtss2sd(xmm0, xmm0);
        __ movdbl(vmarg, xmm0);
      } else {
        __ movdbl(xmm0, vmarg);
        __ cvtsd2ss(xmm0, xmm0);
        __ movflt(vmarg, xmm0);
      }
#else //_LP64
      if (ek == _adapter_opt_f2d) {
        __ fld_s(vmarg);        // load float to ST0
1574
        __ fstp_d(vmarg);       // store double
1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585
      } else {
        __ fld_d(vmarg);        // load double to ST0
        __ fstp_s(vmarg);       // store single
      }
#endif //_LP64

      if (ek == _adapter_opt_d2f) {
        remove_arg_slots(_masm, -stack_move_unit(),
                         rax_argslot, rbx_temp, rdx_temp);
      }

1586
      __ load_heap_oop(rcx_recv, rcx_mh_vmtarget);
1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603
      __ jump_to_method_handle_entry(rcx_recv, rdx_temp);
    }
    break;

  case _adapter_swap_args:
  case _adapter_rot_args:
    // handled completely by optimized cases
    __ stop("init_AdapterMethodHandle should not issue this");
    break;

  case _adapter_opt_swap_1:
  case _adapter_opt_swap_2:
  case _adapter_opt_rot_1_up:
  case _adapter_opt_rot_1_down:
  case _adapter_opt_rot_2_up:
  case _adapter_opt_rot_2_down:
    {
1604 1605
      int swap_slots = ek_adapter_opt_swap_slots(ek);
      int rotate     = ek_adapter_opt_swap_mode(ek);
1606 1607 1608 1609 1610 1611 1612

      // 'argslot' is the position of the first argument to swap
      __ movl(rax_argslot, rcx_amh_vmargslot);
      __ lea(rax_argslot, __ argument_address(rax_argslot));

      // 'vminfo' is the second
      Register rbx_destslot = rbx_temp;
1613
      load_conversion_vminfo(_masm, rbx_destslot, rcx_amh_conversion);
1614
      __ lea(rbx_destslot, __ argument_address(rbx_destslot));
1615 1616
      if (VerifyMethodHandles)
        verify_argslot(_masm, rbx_destslot, "swap point must fall within current frame");
1617

1618
      assert(Interpreter::stackElementSize == wordSize, "else rethink use of wordSize here");
1619
      if (!rotate) {
1620 1621 1622 1623 1624 1625
        // simple swap
        for (int i = 0; i < swap_slots; i++) {
          __ movptr(rdi_temp, Address(rax_argslot,  i * wordSize));
          __ movptr(rdx_temp, Address(rbx_destslot, i * wordSize));
          __ movptr(Address(rax_argslot,  i * wordSize), rdx_temp);
          __ movptr(Address(rbx_destslot, i * wordSize), rdi_temp);
1626 1627
        }
      } else {
1628 1629 1630 1631 1632 1633 1634
        // A rotate is actually pair of moves, with an "odd slot" (or pair)
        // changing place with a series of other slots.
        // First, push the "odd slot", which is going to get overwritten
        for (int i = swap_slots - 1; i >= 0; i--) {
          // handle one with rdi_temp instead of a push:
          if (i == 0)  __ movptr(rdi_temp, Address(rax_argslot, i * wordSize));
          else         __ pushptr(         Address(rax_argslot, i * wordSize));
1635 1636
        }
        if (rotate > 0) {
1637 1638 1639 1640 1641
          // Here is rotate > 0:
          // (low mem)                                          (high mem)
          //     | dest:     more_slots...     | arg: odd_slot :arg+1 |
          // =>
          //     | dest: odd_slot | dest+1: more_slots...      :arg+1 |
1642 1643 1644 1645 1646
          // work argslot down to destslot, copying contiguous data upwards
          // pseudo-code:
          //   rax = src_addr - swap_bytes
          //   rbx = dest_addr
          //   while (rax >= rbx) *(rax + swap_bytes) = *(rax + 0), rax--;
1647 1648 1649 1650 1651
          move_arg_slots_up(_masm,
                            rbx_destslot,
                            Address(rax_argslot, 0),
                            swap_slots,
                            rax_argslot, rdx_temp);
1652
        } else {
1653 1654 1655 1656 1657
          // Here is the other direction, rotate < 0:
          // (low mem)                                          (high mem)
          //     | arg: odd_slot | arg+1: more_slots...       :dest+1 |
          // =>
          //     | arg:    more_slots...     | dest: odd_slot :dest+1 |
1658 1659 1660 1661 1662
          // work argslot up to destslot, copying contiguous data downwards
          // pseudo-code:
          //   rax = src_addr + swap_bytes
          //   rbx = dest_addr
          //   while (rax <= rbx) *(rax - swap_bytes) = *(rax + 0), rax++;
1663 1664 1665 1666
          // dest_slot denotes an exclusive upper limit
          int limit_bias = OP_ROT_ARGS_DOWN_LIMIT_BIAS;
          if (limit_bias != 0)
            __ addptr(rbx_destslot, - limit_bias * wordSize);
1667 1668 1669 1670 1671
          move_arg_slots_down(_masm,
                              Address(rax_argslot, swap_slots * wordSize),
                              rbx_destslot,
                              -swap_slots,
                              rax_argslot, rdx_temp);
1672
          __ subptr(rbx_destslot, swap_slots * wordSize);
1673 1674
        }
        // pop the original first chunk into the destination slot, now free
1675 1676 1677
        for (int i = 0; i < swap_slots; i++) {
          if (i == 0)  __ movptr(Address(rbx_destslot, i * wordSize), rdi_temp);
          else         __ popptr(Address(rbx_destslot, i * wordSize));
1678 1679 1680
        }
      }

1681
      __ load_heap_oop(rcx_recv, rcx_mh_vmtarget);
1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692
      __ jump_to_method_handle_entry(rcx_recv, rdx_temp);
    }
    break;

  case _adapter_dup_args:
    {
      // 'argslot' is the position of the first argument to duplicate
      __ movl(rax_argslot, rcx_amh_vmargslot);
      __ lea(rax_argslot, __ argument_address(rax_argslot));

      // 'stack_move' is negative number of words to duplicate
1693 1694 1695 1696 1697 1698
      Register rdi_stack_move = rdi_temp;
      load_stack_move(_masm, rdi_stack_move, rcx_recv, true);

      if (VerifyMethodHandles) {
        verify_argslots(_masm, rdi_stack_move, rax_argslot, true,
                        "copied argument(s) must fall within current frame");
1699 1700
      }

1701 1702 1703 1704 1705 1706 1707 1708
      // insert location is always the bottom of the argument list:
      Address insert_location = __ argument_address(constant(0));
      int pre_arg_words = insert_location.disp() / wordSize;   // return PC is pushed
      assert(insert_location.base() == rsp, "");

      __ negl(rdi_stack_move);
      push_arg_slots(_masm, rax_argslot, rdi_stack_move,
                     pre_arg_words, rbx_temp, rdx_temp);
1709

1710
      __ load_heap_oop(rcx_recv, rcx_mh_vmtarget);
1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723
      __ jump_to_method_handle_entry(rcx_recv, rdx_temp);
    }
    break;

  case _adapter_drop_args:
    {
      // 'argslot' is the position of the first argument to nuke
      __ movl(rax_argslot, rcx_amh_vmargslot);
      __ lea(rax_argslot, __ argument_address(rax_argslot));

      // (must do previous push after argslot address is taken)

      // 'stack_move' is number of words to drop
1724 1725
      Register rdi_stack_move = rdi_temp;
      load_stack_move(_masm, rdi_stack_move, rcx_recv, false);
1726 1727 1728
      remove_arg_slots(_masm, rdi_stack_move,
                       rax_argslot, rbx_temp, rdx_temp);

1729
      __ load_heap_oop(rcx_recv, rcx_mh_vmtarget);
1730 1731 1732 1733 1734
      __ jump_to_method_handle_entry(rcx_recv, rdx_temp);
    }
    break;

  case _adapter_collect_args:
1735
  case _adapter_fold_args:
1736 1737 1738 1739 1740
  case _adapter_spread_args:
    // handled completely by optimized cases
    __ stop("init_AdapterMethodHandle should not issue this");
    break;

1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961
  case _adapter_opt_collect_ref:
  case _adapter_opt_collect_int:
  case _adapter_opt_collect_long:
  case _adapter_opt_collect_float:
  case _adapter_opt_collect_double:
  case _adapter_opt_collect_void:
  case _adapter_opt_collect_0_ref:
  case _adapter_opt_collect_1_ref:
  case _adapter_opt_collect_2_ref:
  case _adapter_opt_collect_3_ref:
  case _adapter_opt_collect_4_ref:
  case _adapter_opt_collect_5_ref:
  case _adapter_opt_filter_S0_ref:
  case _adapter_opt_filter_S1_ref:
  case _adapter_opt_filter_S2_ref:
  case _adapter_opt_filter_S3_ref:
  case _adapter_opt_filter_S4_ref:
  case _adapter_opt_filter_S5_ref:
  case _adapter_opt_collect_2_S0_ref:
  case _adapter_opt_collect_2_S1_ref:
  case _adapter_opt_collect_2_S2_ref:
  case _adapter_opt_collect_2_S3_ref:
  case _adapter_opt_collect_2_S4_ref:
  case _adapter_opt_collect_2_S5_ref:
  case _adapter_opt_fold_ref:
  case _adapter_opt_fold_int:
  case _adapter_opt_fold_long:
  case _adapter_opt_fold_float:
  case _adapter_opt_fold_double:
  case _adapter_opt_fold_void:
  case _adapter_opt_fold_1_ref:
  case _adapter_opt_fold_2_ref:
  case _adapter_opt_fold_3_ref:
  case _adapter_opt_fold_4_ref:
  case _adapter_opt_fold_5_ref:
    {
      // Given a fresh incoming stack frame, build a new ricochet frame.
      // On entry, TOS points at a return PC, and RBP is the callers frame ptr.
      // RSI/R13 has the caller's exact stack pointer, which we must also preserve.
      // RCX contains an AdapterMethodHandle of the indicated kind.

      // Relevant AMH fields:
      // amh.vmargslot:
      //   points to the trailing edge of the arguments
      //   to filter, collect, or fold.  For a boxing operation,
      //   it points just after the single primitive value.
      // amh.argument:
      //   recursively called MH, on |collect| arguments
      // amh.vmtarget:
      //   final destination MH, on return value, etc.
      // amh.conversion.dest:
      //   tells what is the type of the return value
      //   (not needed here, since dest is also derived from ek)
      // amh.conversion.vminfo:
      //   points to the trailing edge of the return value
      //   when the vmtarget is to be called; this is
      //   equal to vmargslot + (retained ? |collect| : 0)

      // Pass 0 or more argument slots to the recursive target.
      int collect_count_constant = ek_adapter_opt_collect_count(ek);

      // The collected arguments are copied from the saved argument list:
      int collect_slot_constant = ek_adapter_opt_collect_slot(ek);

      assert(ek_orig == _adapter_collect_args ||
             ek_orig == _adapter_fold_args, "");
      bool retain_original_args = (ek_orig == _adapter_fold_args);

      // The return value is replaced (or inserted) at the 'vminfo' argslot.
      // Sometimes we can compute this statically.
      int dest_slot_constant = -1;
      if (!retain_original_args)
        dest_slot_constant = collect_slot_constant;
      else if (collect_slot_constant >= 0 && collect_count_constant >= 0)
        // We are preserving all the arguments, and the return value is prepended,
        // so the return slot is to the left (above) the |collect| sequence.
        dest_slot_constant = collect_slot_constant + collect_count_constant;

      // Replace all those slots by the result of the recursive call.
      // The result type can be one of ref, int, long, float, double, void.
      // In the case of void, nothing is pushed on the stack after return.
      BasicType dest = ek_adapter_opt_collect_type(ek);
      assert(dest == type2wfield[dest], "dest is a stack slot type");
      int dest_count = type2size[dest];
      assert(dest_count == 1 || dest_count == 2 || (dest_count == 0 && dest == T_VOID), "dest has a size");

      // Choose a return continuation.
      EntryKind ek_ret = _adapter_opt_return_any;
      if (dest != T_CONFLICT && OptimizeMethodHandles) {
        switch (dest) {
        case T_INT    : ek_ret = _adapter_opt_return_int;     break;
        case T_LONG   : ek_ret = _adapter_opt_return_long;    break;
        case T_FLOAT  : ek_ret = _adapter_opt_return_float;   break;
        case T_DOUBLE : ek_ret = _adapter_opt_return_double;  break;
        case T_OBJECT : ek_ret = _adapter_opt_return_ref;     break;
        case T_VOID   : ek_ret = _adapter_opt_return_void;    break;
        default       : ShouldNotReachHere();
        }
        if (dest == T_OBJECT && dest_slot_constant >= 0) {
          EntryKind ek_try = EntryKind(_adapter_opt_return_S0_ref + dest_slot_constant);
          if (ek_try <= _adapter_opt_return_LAST &&
              ek_adapter_opt_return_slot(ek_try) == dest_slot_constant) {
            ek_ret = ek_try;
          }
        }
        assert(ek_adapter_opt_return_type(ek_ret) == dest, "");
      }

      // Already pushed:  ... keep1 | collect | keep2 | sender_pc |
      // push(sender_pc);

      // Compute argument base:
      Register rax_argv = rax_argslot;
      __ lea(rax_argv, __ argument_address(constant(0)));

      // Push a few extra argument words, if we need them to store the return value.
      {
        int extra_slots = 0;
        if (retain_original_args) {
          extra_slots = dest_count;
        } else if (collect_count_constant == -1) {
          extra_slots = dest_count;  // collect_count might be zero; be generous
        } else if (dest_count > collect_count_constant) {
          extra_slots = (dest_count - collect_count_constant);
        } else {
          // else we know we have enough dead space in |collect| to repurpose for return values
        }
        DEBUG_ONLY(extra_slots += 1);
        if (extra_slots > 0) {
          __ pop(rbx_temp);   // return value
          __ subptr(rsp, (extra_slots * Interpreter::stackElementSize));
          // Push guard word #2 in debug mode.
          DEBUG_ONLY(__ movptr(Address(rsp, 0), (int32_t) RicochetFrame::MAGIC_NUMBER_2));
          __ push(rbx_temp);
        }
      }

      RicochetFrame::enter_ricochet_frame(_masm, rcx_recv, rax_argv,
                                          entry(ek_ret)->from_interpreted_entry(), rbx_temp);

      // Now pushed:  ... keep1 | collect | keep2 | RF |
      // some handy frame slots:
      Address exact_sender_sp_addr = RicochetFrame::frame_address(RicochetFrame::exact_sender_sp_offset_in_bytes());
      Address conversion_addr      = RicochetFrame::frame_address(RicochetFrame::conversion_offset_in_bytes());
      Address saved_args_base_addr = RicochetFrame::frame_address(RicochetFrame::saved_args_base_offset_in_bytes());

#ifdef ASSERT
      if (VerifyMethodHandles && dest != T_CONFLICT) {
        BLOCK_COMMENT("verify AMH.conv.dest");
        load_conversion_dest_type(_masm, rbx_temp, conversion_addr);
        Label L_dest_ok;
        __ cmpl(rbx_temp, (int) dest);
        __ jcc(Assembler::equal, L_dest_ok);
        if (dest == T_INT) {
          for (int bt = T_BOOLEAN; bt < T_INT; bt++) {
            if (is_subword_type(BasicType(bt))) {
              __ cmpl(rbx_temp, (int) bt);
              __ jcc(Assembler::equal, L_dest_ok);
            }
          }
        }
        __ stop("bad dest in AMH.conv");
        __ BIND(L_dest_ok);
      }
#endif //ASSERT

      // Find out where the original copy of the recursive argument sequence begins.
      Register rax_coll = rax_argv;
      {
        RegisterOrConstant collect_slot = collect_slot_constant;
        if (collect_slot_constant == -1) {
          __ movl(rdi_temp, rcx_amh_vmargslot);
          collect_slot = rdi_temp;
        }
        if (collect_slot_constant != 0)
          __ lea(rax_coll, Address(rax_argv, collect_slot, Interpreter::stackElementScale()));
        // rax_coll now points at the trailing edge of |collect| and leading edge of |keep2|
      }

      // Replace the old AMH with the recursive MH.  (No going back now.)
      // In the case of a boxing call, the recursive call is to a 'boxer' method,
      // such as Integer.valueOf or Long.valueOf.  In the case of a filter
      // or collect call, it will take one or more arguments, transform them,
      // and return some result, to store back into argument_base[vminfo].
      __ load_heap_oop(rcx_recv, rcx_amh_argument);
      if (VerifyMethodHandles)  verify_method_handle(_masm, rcx_recv);

      // Push a space for the recursively called MH first:
      __ push((int32_t)NULL_WORD);

      // Calculate |collect|, the number of arguments we are collecting.
      Register rdi_collect_count = rdi_temp;
      RegisterOrConstant collect_count;
      if (collect_count_constant >= 0) {
        collect_count = collect_count_constant;
      } else {
        __ load_method_handle_vmslots(rdi_collect_count, rcx_recv, rdx_temp);
        collect_count = rdi_collect_count;
      }
#ifdef ASSERT
      if (VerifyMethodHandles && collect_count_constant >= 0) {
        __ load_method_handle_vmslots(rbx_temp, rcx_recv, rdx_temp);
        Label L_count_ok;
        __ cmpl(rbx_temp, collect_count_constant);
        __ jcc(Assembler::equal, L_count_ok);
        __ stop("bad vminfo in AMH.conv");
        __ BIND(L_count_ok);
      }
#endif //ASSERT

      // copy |collect| slots directly to TOS:
      push_arg_slots(_masm, rax_coll, collect_count, 0, rbx_temp, rdx_temp);
      // Now pushed:  ... keep1 | collect | keep2 | RF... | collect |
      // rax_coll still points at the trailing edge of |collect| and leading edge of |keep2|

      // If necessary, adjust the saved arguments to make room for the eventual return value.
      // Normal adjustment:  ... keep1 | +dest+ | -collect- | keep2 | RF... | collect |
      // If retaining args:  ... keep1 | +dest+ |  collect  | keep2 | RF... | collect |
      // In the non-retaining case, this might move keep2 either up or down.
      // We don't have to copy the whole | RF... collect | complex,
      // but we must adjust RF.saved_args_base.
1962
      // Also, from now on, we will forget about the original copy of |collect|.
1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018
      // If we are retaining it, we will treat it as part of |keep2|.
      // For clarity we will define |keep3| = |collect|keep2| or |keep2|.

      BLOCK_COMMENT("adjust trailing arguments {");
      // Compare the sizes of |+dest+| and |-collect-|, which are opposed opening and closing movements.
      int                open_count  = dest_count;
      RegisterOrConstant close_count = collect_count_constant;
      Register rdi_close_count = rdi_collect_count;
      if (retain_original_args) {
        close_count = constant(0);
      } else if (collect_count_constant == -1) {
        close_count = rdi_collect_count;
      }

      // How many slots need moving?  This is simply dest_slot (0 => no |keep3|).
      RegisterOrConstant keep3_count;
      Register rsi_keep3_count = rsi;  // can repair from RF.exact_sender_sp
      if (dest_slot_constant >= 0) {
        keep3_count = dest_slot_constant;
      } else  {
        load_conversion_vminfo(_masm, rsi_keep3_count, conversion_addr);
        keep3_count = rsi_keep3_count;
      }
#ifdef ASSERT
      if (VerifyMethodHandles && dest_slot_constant >= 0) {
        load_conversion_vminfo(_masm, rbx_temp, conversion_addr);
        Label L_vminfo_ok;
        __ cmpl(rbx_temp, dest_slot_constant);
        __ jcc(Assembler::equal, L_vminfo_ok);
        __ stop("bad vminfo in AMH.conv");
        __ BIND(L_vminfo_ok);
      }
#endif //ASSERT

      // tasks remaining:
      bool move_keep3 = (!keep3_count.is_constant() || keep3_count.as_constant() != 0);
      bool stomp_dest = (NOT_DEBUG(dest == T_OBJECT) DEBUG_ONLY(dest_count != 0));
      bool fix_arg_base = (!close_count.is_constant() || open_count != close_count.as_constant());

      if (stomp_dest | fix_arg_base) {
        // we will probably need an updated rax_argv value
        if (collect_slot_constant >= 0) {
          // rax_coll already holds the leading edge of |keep2|, so tweak it
          assert(rax_coll == rax_argv, "elided a move");
          if (collect_slot_constant != 0)
            __ subptr(rax_argv, collect_slot_constant * Interpreter::stackElementSize);
        } else {
          // Just reload from RF.saved_args_base.
          __ movptr(rax_argv, saved_args_base_addr);
        }
      }

      // Old and new argument locations (based at slot 0).
      // Net shift (&new_argv - &old_argv) is (close_count - open_count).
      bool zero_open_count = (open_count == 0);  // remember this bit of info
      if (move_keep3 && fix_arg_base) {
2019
        // It will be easier to have everything in one register:
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        if (close_count.is_register()) {
          // Deduct open_count from close_count register to get a clean +/- value.
          __ subptr(close_count.as_register(), open_count);
        } else {
          close_count = close_count.as_constant() - open_count;
        }
        open_count = 0;
      }
      Address old_argv(rax_argv, 0);
      Address new_argv(rax_argv, close_count,  Interpreter::stackElementScale(),
                                - open_count * Interpreter::stackElementSize);

      // First decide if any actual data are to be moved.
      // We can skip if (a) |keep3| is empty, or (b) the argument list size didn't change.
      // (As it happens, all movements involve an argument list size change.)

      // If there are variable parameters, use dynamic checks to skip around the whole mess.
      Label L_done;
      if (!keep3_count.is_constant()) {
        __ testl(keep3_count.as_register(), keep3_count.as_register());
        __ jcc(Assembler::zero, L_done);
      }
      if (!close_count.is_constant()) {
        __ cmpl(close_count.as_register(), open_count);
        __ jcc(Assembler::equal, L_done);
      }

      if (move_keep3 && fix_arg_base) {
        bool emit_move_down = false, emit_move_up = false, emit_guard = false;
        if (!close_count.is_constant()) {
          emit_move_down = emit_guard = !zero_open_count;
          emit_move_up   = true;
        } else if (open_count != close_count.as_constant()) {
          emit_move_down = (open_count > close_count.as_constant());
          emit_move_up   = !emit_move_down;
        }
        Label L_move_up;
        if (emit_guard) {
          __ cmpl(close_count.as_register(), open_count);
          __ jcc(Assembler::greater, L_move_up);
        }

        if (emit_move_down) {
          // Move arguments down if |+dest+| > |-collect-|
          // (This is rare, except when arguments are retained.)
          // This opens space for the return value.
          if (keep3_count.is_constant()) {
            for (int i = 0; i < keep3_count.as_constant(); i++) {
              __ movptr(rdx_temp, old_argv.plus_disp(i * Interpreter::stackElementSize));
              __ movptr(          new_argv.plus_disp(i * Interpreter::stackElementSize), rdx_temp);
            }
          } else {
            Register rbx_argv_top = rbx_temp;
            __ lea(rbx_argv_top, old_argv.plus_disp(keep3_count, Interpreter::stackElementScale()));
            move_arg_slots_down(_masm,
                                old_argv,     // beginning of old argv
                                rbx_argv_top, // end of old argv
                                close_count,  // distance to move down (must be negative)
                                rax_argv, rdx_temp);
            // Used argv as an iteration variable; reload from RF.saved_args_base.
            __ movptr(rax_argv, saved_args_base_addr);
          }
        }

        if (emit_guard) {
          __ jmp(L_done);  // assumes emit_move_up is true also
          __ BIND(L_move_up);
        }

        if (emit_move_up) {

          // Move arguments up if |+dest+| < |-collect-|
          // (This is usual, except when |keep3| is empty.)
          // This closes up the space occupied by the now-deleted collect values.
          if (keep3_count.is_constant()) {
            for (int i = keep3_count.as_constant() - 1; i >= 0; i--) {
              __ movptr(rdx_temp, old_argv.plus_disp(i * Interpreter::stackElementSize));
              __ movptr(          new_argv.plus_disp(i * Interpreter::stackElementSize), rdx_temp);
            }
          } else {
            Address argv_top = old_argv.plus_disp(keep3_count, Interpreter::stackElementScale());
            move_arg_slots_up(_masm,
                              rax_argv,     // beginning of old argv
                              argv_top,     // end of old argv
                              close_count,  // distance to move up (must be positive)
                              rbx_temp, rdx_temp);
          }
        }
      }
      __ BIND(L_done);

      if (fix_arg_base) {
        // adjust RF.saved_args_base by adding (close_count - open_count)
        if (!new_argv.is_same_address(Address(rax_argv, 0)))
          __ lea(rax_argv, new_argv);
        __ movptr(saved_args_base_addr, rax_argv);
      }

      if (stomp_dest) {
        // Stomp the return slot, so it doesn't hold garbage.
        // This isn't strictly necessary, but it may help detect bugs.
        int forty_two = RicochetFrame::RETURN_VALUE_PLACEHOLDER;
        __ movptr(Address(rax_argv, keep3_count, Address::times_ptr),
                  (int32_t) forty_two);
        // uses rsi_keep3_count
      }
      BLOCK_COMMENT("} adjust trailing arguments");

      BLOCK_COMMENT("do_recursive_call");
      __ mov(saved_last_sp, rsp);    // set rsi/r13 for callee
      __ pushptr(ExternalAddress(SharedRuntime::ricochet_blob()->bounce_addr()).addr());
      // The globally unique bounce address has two purposes:
      // 1. It helps the JVM recognize this frame (frame::is_ricochet_frame).
      // 2. When returned to, it cuts back the stack and redirects control flow
      //    to the return handler.
      // The return handler will further cut back the stack when it takes
      // down the RF.  Perhaps there is a way to streamline this further.

      // State during recursive call:
      // ... keep1 | dest | dest=42 | keep3 | RF... | collect | bounce_pc |
      __ jump_to_method_handle_entry(rcx_recv, rdx_temp);

      break;
    }

  case _adapter_opt_return_ref:
  case _adapter_opt_return_int:
  case _adapter_opt_return_long:
  case _adapter_opt_return_float:
  case _adapter_opt_return_double:
  case _adapter_opt_return_void:
  case _adapter_opt_return_S0_ref:
  case _adapter_opt_return_S1_ref:
  case _adapter_opt_return_S2_ref:
  case _adapter_opt_return_S3_ref:
  case _adapter_opt_return_S4_ref:
  case _adapter_opt_return_S5_ref:
    {
      BasicType dest_type_constant = ek_adapter_opt_return_type(ek);
      int       dest_slot_constant = ek_adapter_opt_return_slot(ek);

      if (VerifyMethodHandles)  RicochetFrame::verify_clean(_masm);

      if (dest_slot_constant == -1) {
        // The current stub is a general handler for this dest_type.
        // It can be called from _adapter_opt_return_any below.
        // Stash the address in a little table.
        assert((dest_type_constant & CONV_TYPE_MASK) == dest_type_constant, "oob");
        address return_handler = __ pc();
        _adapter_return_handlers[dest_type_constant] = return_handler;
        if (dest_type_constant == T_INT) {
          // do the subword types too
          for (int bt = T_BOOLEAN; bt < T_INT; bt++) {
            if (is_subword_type(BasicType(bt)) &&
                _adapter_return_handlers[bt] == NULL) {
              _adapter_return_handlers[bt] = return_handler;
            }
          }
        }
      }

      Register rbx_arg_base = rbx_temp;
      assert_different_registers(rax, rdx,  // possibly live return value registers
                                 rdi_temp, rbx_arg_base);

      Address conversion_addr      = RicochetFrame::frame_address(RicochetFrame::conversion_offset_in_bytes());
      Address saved_args_base_addr = RicochetFrame::frame_address(RicochetFrame::saved_args_base_offset_in_bytes());

      __ movptr(rbx_arg_base, saved_args_base_addr);
      RegisterOrConstant dest_slot = dest_slot_constant;
      if (dest_slot_constant == -1) {
        load_conversion_vminfo(_masm, rdi_temp, conversion_addr);
        dest_slot = rdi_temp;
      }
      // Store the result back into the argslot.
      // This code uses the interpreter calling sequence, in which the return value
      // is usually left in the TOS register, as defined by InterpreterMacroAssembler::pop.
      // There are certain irregularities with floating point values, which can be seen
      // in TemplateInterpreterGenerator::generate_return_entry_for.
      move_return_value(_masm, dest_type_constant, Address(rbx_arg_base, dest_slot, Interpreter::stackElementScale()));

      RicochetFrame::leave_ricochet_frame(_masm, rcx_recv, rbx_arg_base, rdx_temp);
      __ push(rdx_temp);  // repush the return PC

      // Load the final target and go.
      if (VerifyMethodHandles)  verify_method_handle(_masm, rcx_recv);
      __ jump_to_method_handle_entry(rcx_recv, rdx_temp);
      __ hlt(); // --------------------
      break;
    }

  case _adapter_opt_return_any:
    {
      if (VerifyMethodHandles)  RicochetFrame::verify_clean(_masm);
      Register rdi_conv = rdi_temp;
      assert_different_registers(rax, rdx,  // possibly live return value registers
                                 rdi_conv, rbx_temp);

      Address conversion_addr = RicochetFrame::frame_address(RicochetFrame::conversion_offset_in_bytes());
      load_conversion_dest_type(_masm, rdi_conv, conversion_addr);
      __ lea(rbx_temp, ExternalAddress((address) &_adapter_return_handlers[0]));
      __ movptr(rbx_temp, Address(rbx_temp, rdi_conv, Address::times_ptr));

#ifdef ASSERT
      { Label L_badconv;
        __ testptr(rbx_temp, rbx_temp);
        __ jccb(Assembler::zero, L_badconv);
        __ jmp(rbx_temp);
        __ bind(L_badconv);
        __ stop("bad method handle return");
      }
#else //ASSERT
      __ jmp(rbx_temp);
#endif //ASSERT
      break;
    }

2237
  case _adapter_opt_spread_0:
2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250
  case _adapter_opt_spread_1_ref:
  case _adapter_opt_spread_2_ref:
  case _adapter_opt_spread_3_ref:
  case _adapter_opt_spread_4_ref:
  case _adapter_opt_spread_5_ref:
  case _adapter_opt_spread_ref:
  case _adapter_opt_spread_byte:
  case _adapter_opt_spread_char:
  case _adapter_opt_spread_short:
  case _adapter_opt_spread_int:
  case _adapter_opt_spread_long:
  case _adapter_opt_spread_float:
  case _adapter_opt_spread_double:
2251 2252
    {
      // spread an array out into a group of arguments
2253 2254 2255 2256 2257 2258 2259 2260
      int length_constant = ek_adapter_opt_spread_count(ek);
      bool length_can_be_zero = (length_constant == 0);
      if (length_constant < 0) {
        // some adapters with variable length must handle the zero case
        if (!OptimizeMethodHandles ||
            ek_adapter_opt_spread_type(ek) != T_OBJECT)
          length_can_be_zero = true;
      }
2261 2262 2263 2264 2265

      // find the address of the array argument
      __ movl(rax_argslot, rcx_amh_vmargslot);
      __ lea(rax_argslot, __ argument_address(rax_argslot));

2266 2267 2268 2269 2270 2271
      // grab another temp
      Register rsi_temp = rsi;
      { if (rsi_temp == saved_last_sp)  __ push(saved_last_sp); }
      // (preceding push must be done after argslot address is taken!)
#define UNPUSH_RSI \
      { if (rsi_temp == saved_last_sp)  __ pop(saved_last_sp); }
2272 2273 2274 2275 2276

      // arx_argslot points both to the array and to the first output arg
      vmarg = Address(rax_argslot, 0);

      // Get the array value.
2277
      Register  rsi_array       = rsi_temp;
2278
      Register  rdx_array_klass = rdx_temp;
2279 2280 2281
      BasicType elem_type = ek_adapter_opt_spread_type(ek);
      int       elem_slots = type2size[elem_type];  // 1 or 2
      int       array_slots = 1;  // array is always a T_OBJECT
2282 2283 2284
      int       length_offset   = arrayOopDesc::length_offset_in_bytes();
      int       elem0_offset    = arrayOopDesc::base_offset_in_bytes(elem_type);
      __ movptr(rsi_array, vmarg);
2285 2286 2287 2288 2289 2290 2291 2292 2293 2294

      Label L_array_is_empty, L_insert_arg_space, L_copy_args, L_args_done;
      if (length_can_be_zero) {
        // handle the null pointer case, if zero is allowed
        Label L_skip;
        if (length_constant < 0) {
          load_conversion_vminfo(_masm, rbx_temp, rcx_amh_conversion);
          __ testl(rbx_temp, rbx_temp);
          __ jcc(Assembler::notZero, L_skip);
        }
2295
        __ testptr(rsi_array, rsi_array);
2296 2297
        __ jcc(Assembler::zero, L_array_is_empty);
        __ bind(L_skip);
2298 2299 2300 2301 2302 2303
      }
      __ null_check(rsi_array, oopDesc::klass_offset_in_bytes());
      __ load_klass(rdx_array_klass, rsi_array);

      // Check the array type.
      Register rbx_klass = rbx_temp;
2304
      __ load_heap_oop(rbx_klass, rcx_amh_argument); // this is a Class object!
2305
      load_klass_from_Class(_masm, rbx_klass);
2306 2307

      Label ok_array_klass, bad_array_klass, bad_array_length;
2308
      __ check_klass_subtype(rdx_array_klass, rbx_klass, rdi_temp, ok_array_klass);
2309 2310
      // If we get here, the type check failed!
      __ jmp(bad_array_klass);
2311
      __ BIND(ok_array_klass);
2312 2313 2314 2315 2316 2317

      // Check length.
      if (length_constant >= 0) {
        __ cmpl(Address(rsi_array, length_offset), length_constant);
      } else {
        Register rbx_vminfo = rbx_temp;
2318
        load_conversion_vminfo(_masm, rbx_vminfo, rcx_amh_conversion);
2319 2320 2321 2322 2323 2324 2325 2326 2327
        __ cmpl(rbx_vminfo, Address(rsi_array, length_offset));
      }
      __ jcc(Assembler::notEqual, bad_array_length);

      Register rdx_argslot_limit = rdx_temp;

      // Array length checks out.  Now insert any required stack slots.
      if (length_constant == -1) {
        // Form a pointer to the end of the affected region.
2328
        __ lea(rdx_argslot_limit, Address(rax_argslot, Interpreter::stackElementSize));
2329
        // 'stack_move' is negative number of words to insert
2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343
        // This number already accounts for elem_slots.
        Register rdi_stack_move = rdi_temp;
        load_stack_move(_masm, rdi_stack_move, rcx_recv, true);
        __ cmpptr(rdi_stack_move, 0);
        assert(stack_move_unit() < 0, "else change this comparison");
        __ jcc(Assembler::less, L_insert_arg_space);
        __ jcc(Assembler::equal, L_copy_args);
        // single argument case, with no array movement
        __ BIND(L_array_is_empty);
        remove_arg_slots(_masm, -stack_move_unit() * array_slots,
                         rax_argslot, rbx_temp, rdx_temp);
        __ jmp(L_args_done);  // no spreading to do
        __ BIND(L_insert_arg_space);
        // come here in the usual case, stack_move < 0 (2 or more spread arguments)
2344
        Register rsi_temp = rsi_array;  // spill this
2345
        insert_arg_slots(_masm, rdi_stack_move,
2346
                         rax_argslot, rbx_temp, rsi_temp);
2347 2348 2349 2350 2351 2352
        // reload the array since rsi was killed
        // reload from rdx_argslot_limit since rax_argslot is now decremented
        __ movptr(rsi_array, Address(rdx_argslot_limit, -Interpreter::stackElementSize));
      } else if (length_constant >= 1) {
        int new_slots = (length_constant * elem_slots) - array_slots;
        insert_arg_slots(_masm, new_slots * stack_move_unit(),
2353 2354
                         rax_argslot, rbx_temp, rdx_temp);
      } else if (length_constant == 0) {
2355 2356
        __ BIND(L_array_is_empty);
        remove_arg_slots(_masm, -stack_move_unit() * array_slots,
2357
                         rax_argslot, rbx_temp, rdx_temp);
2358 2359
      } else {
        ShouldNotReachHere();
2360 2361 2362 2363 2364
      }

      // Copy from the array to the new slots.
      // Note: Stack change code preserves integrity of rax_argslot pointer.
      // So even after slot insertions, rax_argslot still points to first argument.
2365 2366 2367 2368
      // Beware:  Arguments that are shallow on the stack are deep in the array,
      // and vice versa.  So a downward-growing stack (the usual) has to be copied
      // elementwise in reverse order from the source array.
      __ BIND(L_copy_args);
2369 2370
      if (length_constant == -1) {
        // [rax_argslot, rdx_argslot_limit) is the area we are inserting into.
2371
        // Array element [0] goes at rdx_argslot_limit[-wordSize].
2372 2373
        Register rsi_source = rsi_array;
        __ lea(rsi_source, Address(rsi_array, elem0_offset));
2374
        Register rdx_fill_ptr = rdx_argslot_limit;
2375
        Label loop;
2376 2377 2378 2379 2380
        __ BIND(loop);
        __ addptr(rdx_fill_ptr, -Interpreter::stackElementSize * elem_slots);
        move_typed_arg(_masm, elem_type, true,
                       Address(rdx_fill_ptr, 0), Address(rsi_source, 0),
                       rbx_temp, rdi_temp);
2381
        __ addptr(rsi_source, type2aelembytes(elem_type));
2382
        __ cmpptr(rdx_fill_ptr, rax_argslot);
2383
        __ jcc(Assembler::above, loop);
2384 2385 2386 2387
      } else if (length_constant == 0) {
        // nothing to copy
      } else {
        int elem_offset = elem0_offset;
2388
        int slot_offset = length_constant * Interpreter::stackElementSize;
2389
        for (int index = 0; index < length_constant; index++) {
2390 2391 2392 2393
          slot_offset -= Interpreter::stackElementSize * elem_slots;  // fill backward
          move_typed_arg(_masm, elem_type, true,
                         Address(rax_argslot, slot_offset), Address(rsi_array, elem_offset),
                         rbx_temp, rdi_temp);
2394 2395 2396
          elem_offset += type2aelembytes(elem_type);
        }
      }
2397
      __ BIND(L_args_done);
2398 2399

      // Arguments are spread.  Move to next method handle.
2400
      UNPUSH_RSI;
2401
      __ load_heap_oop(rcx_recv, rcx_mh_vmtarget);
2402 2403 2404
      __ jump_to_method_handle_entry(rcx_recv, rdx_temp);

      __ bind(bad_array_klass);
2405
      UNPUSH_RSI;
2406
      assert(!vmarg.uses(rarg2_required), "must be different registers");
2407 2408 2409
      __ load_heap_oop( rarg2_required, Address(rdx_array_klass, java_mirror_offset));  // required type
      __ movptr(        rarg1_actual,   vmarg);                                         // bad array
      __ movl(          rarg0_code,     (int) Bytecodes::_aaload);                      // who is complaining?
2410
      __ jump(ExternalAddress(from_interpreted_entry(_raise_exception)));
2411 2412

      __ bind(bad_array_length);
2413
      UNPUSH_RSI;
2414
      assert(!vmarg.uses(rarg2_required), "must be different registers");
2415 2416 2417
      __ mov(    rarg2_required, rcx_recv);                       // AMH requiring a certain length
      __ movptr( rarg1_actual,   vmarg);                          // bad array
      __ movl(   rarg0_code,     (int) Bytecodes::_arraylength);  // who is complaining?
2418
      __ jump(ExternalAddress(from_interpreted_entry(_raise_exception)));
2419
#undef UNPUSH_RSI
2420

2421
      break;
2422 2423
    }

2424 2425 2426 2427
  default:
    // do not require all platforms to recognize all adapter types
    __ nop();
    return;
2428
  }
2429
  BLOCK_COMMENT(err_msg("} Entry %s", entry_name(ek)));
2430 2431 2432 2433 2434 2435 2436
  __ hlt();

  address me_cookie = MethodHandleEntry::start_compiled_entry(_masm, interp_entry);
  __ unimplemented(entry_name(ek)); // %%% FIXME: NYI

  init_entry(ek, MethodHandleEntry::finish_compiled_entry(_masm, me_cookie));
}