Пример #1
0
ArrayAddress AssociateArray::get_first()
{
    ArrayMap::const_iterator it;
    it = map->begin();
    if (it == map->end())
        return ArrayAddress();
    return ArrayAddress(it);
}
Пример #2
0
ArrayAddress AssociateArray::get_prefix(const std::string & prefix, int index,
                                        ArrayAddress start)
{
    ArrayMap::const_iterator it;
    if (start.null)
        it = map->begin();
    else
        it = start.it;

    for (; it != map->end(); it++) {
        const std::string & other = it->first;
        if (other.compare(0, prefix.size(), prefix) != 0)
            continue;
        if (index == 0)
            return ArrayAddress(it);
        index--;
    }
    return ArrayAddress();
}
void MetaspaceShared::generate_vtable_methods(void** vtbl_list,
                                                   void** vtable,
                                                   char** md_top,
                                                   char* md_end,
                                                   char** mc_top,
                                                   char* mc_end) {

  intptr_t vtable_bytes = (num_virtuals * vtbl_list_size) * sizeof(void*);
  *(intptr_t *)(*md_top) = vtable_bytes;
  *md_top += sizeof(intptr_t);
  void** dummy_vtable = (void**)*md_top;
  *vtable = dummy_vtable;
  *md_top += vtable_bytes;

  // Get ready to generate dummy methods.

  CodeBuffer cb((unsigned char*)*mc_top, mc_end - *mc_top);
  MacroAssembler* masm = new MacroAssembler(&cb);

  Label common_code;
  for (int i = 0; i < vtbl_list_size; ++i) {
    for (int j = 0; j < num_virtuals; ++j) {
      dummy_vtable[num_virtuals * i + j] = (void*)masm->pc();

      // Load rax, with a value indicating vtable/offset pair.
      // -- bits[ 7..0]  (8 bits) which virtual method in table?
      // -- bits[12..8]  (5 bits) which virtual method table?
      // -- must fit in 13-bit instruction immediate field.
      __ movl(rax, (i << 8) + j);
      __ jmp(common_code);
    }
  }

  __ bind(common_code);

#ifdef WIN32
  // Expecting to be called with "thiscall" conventions -- the arguments
  // are on the stack, except that the "this" pointer is in rcx.
#else
  // Expecting to be called with Unix conventions -- the arguments
  // are on the stack, including the "this" pointer.
#endif

  // In addition, rax was set (above) to the offset of the method in the
  // table.

#ifdef WIN32
  __ push(rcx);                         // save "this"
#endif
  __ mov(rcx, rax);
  __ shrptr(rcx, 8);                    // isolate vtable identifier.
  __ shlptr(rcx, LogBytesPerWord);
  Address index(noreg, rcx,  Address::times_1);
  ExternalAddress vtbl((address)vtbl_list);
  __ movptr(rdx, ArrayAddress(vtbl, index)); // get correct vtable address.
#ifdef WIN32
  __ pop(rcx);                          // restore "this"
#else
  __ movptr(rcx, Address(rsp, BytesPerWord));   // fetch "this"
#endif
  __ movptr(Address(rcx, 0), rdx);      // update vtable pointer.

  __ andptr(rax, 0x00ff);                       // isolate vtable method index
  __ shlptr(rax, LogBytesPerWord);
  __ addptr(rax, rdx);                  // address of real method pointer.
  __ jmp(Address(rax, 0));              // get real method pointer.

  __ flush();

  *mc_top = (char*)__ pc();
}