question about the function argument-- this pointer

[zhgong007]

so below is a F5 code of an function generated by IDA

so "_DWORD *this"

this particular argument ( or this pointer) should be regarded as a real funtion argument, or not?



_DWORD *__thiscall sub_464060(_DWORD *this, _DWORD *Src)
{
_DWORD *v3; // edi
bool v4; // cf
unsigned int v5; // eax
_DWORD *result; // eax
int v7; // ebx
void *v8; // eax
_DWORD *v9; // ecx
void *Srca; // [esp+14h] [ebp+8h]

v3 = Src;
this[4] = 0;
this[5] = 0;
v4 = Src[5] < 0x10u;
v5 = Src[4];
Srca = (void *)v5;
if ( !v4 )
v3 = (_DWORD *)*v3;
if ( v5 >= 0x10 )
{
v7 = v5 | 0xF;
if ( (v5 | 0xF) > 0x7FFFFFFF )
v7 = 0x7FFFFFFF;
if ( (unsigned int)(v7 + 1) < 0x1000 )
{
if ( v7 == -1 )
v9 = 0;
else
v9 = operator new(v7 + 1);
}
else
{
if ( v7 + 36 <= (unsigned int)(v7 + 1) )
sub_44B280();
v8 = operator new(v7 + 36);
if ( !v8 )
invalid_parameter_noinfo_noreturn();
v9 = (_DWORD *)(((unsigned int)v8 + 35) & 0xFFFFFFE0);
*(v9 - 1) = v8;
}
*this = v9;
memcpy(v9, v3, (size_t)Srca + 1);
this[4] = Srca;
result = this;
this[5] = v7;
}
else
{
*(_OWORD *)this = *(_OWORD *)v3;
this[4] = v5;
result = this;
this[5] = 15;
}
return result;
}