Decompile C++ into C

code.c

#include <stdio.h>

typedef struct _Object
{
  int x;
  int y;
} Object;


void
Object_init(Object *this, int x, int y)
{
  this->x = x;
  this->y = y;
}

void
Object_foo0(Object *this)
{
  printf("Object::foo %d\n", this->x);
}

void
Object_foo1(Object *this, int z)
{
  printf("Object::foo %d, %d, %d\n", this->x, this->y, z);
}

int
main()
{
  Object object;

  Object_init(&object, 1, 2);
  Object_foo0(&object);
  Object_foo1(&object, 3);

  return 0;
}

code.c.asm

Object_init(Object *, int, int) proc near

    arg_0= qword ptr  10h
    arg_8= dword ptr  18h
    arg_10= dword ptr  20h

    push    rbp
    mov     rbp, rsp
    mov     [rbp+arg_0], rcx
    mov     [rbp+arg_8], edx
    mov     [rbp+arg_10], r8d
    mov     rax, [rbp+arg_0]
    mov     edx, [rbp+arg_8]
    mov     [rax], edx
    mov     rax, [rbp+arg_0]
    mov     edx, [rbp+arg_10]
    mov     [rax+4], edx
    nop
    pop     rbp
    retn
Object_init(Object *, int, int) endp

-------------------------------------------------------------------------------

Object_foo0(Object *) proc near

    arg_0= qword ptr  10h

    push    rbp
    mov     rbp, rsp
    sub     rsp, 20h
    mov     [rbp+arg_0], rcx
    mov     rax, [rbp+arg_0]
    mov     eax, [rax]
    mov     edx, eax
    lea     rcx, Format     ; "Object::foo %d\n"
    call    printf
    nop
    add     rsp, 20h
    pop     rbp
    retn
Object_foo0 endp

-------------------------------------------------------------------------------

Object_foo1(Object *, int) proc near

    arg_0= qword ptr  10h
    arg_8= dword ptr  18h

    push    rbp
    mov     rbp, rsp
    sub     rsp, 20h
    mov     [rbp+arg_0], rcx
    mov     [rbp+arg_8], edx
    mov     rax, [rbp+arg_0]
    mov     edx, [rax+4]
    mov     rax, [rbp+arg_0]
    mov     eax, [rax]
    mov     ecx, [rbp+arg_8]
    mov     r9d, ecx
    mov     r8d, edx
    mov     edx, eax
    lea     rcx, aObjectFooDDD ; "Object::foo %d, %d, %d\n"
    call    printf
    nop
    add     rsp, 20h
    pop     rbp
    retn
Object_foo1 endp

-------------------------------------------------------------------------------

main proc near

    var_8= byte ptr -8

    push    rbp
    mov     rbp, rsp
    sub     rsp, 30h
    call    sub_4016F0
    lea     rax, [rbp+var_8]
    mov     r8d, 2
    mov     edx, 1
    mov     rcx, rax
    call    Object_init(Object *, int, int)
    lea     rax, [rbp+var_8]
    mov     rcx, rax
    call    Object_foo0(Object *)
    lea     rax, [rbp+var_8]
    mov     edx, 3
    mov     rcx, rax
    call    Object_foo1(Object *, int)
    mov     eax, 0
    add     rsp, 30h
    pop     rbp
    retn
main endp

code.cpp

#include <cstdio>

class Object
{
  int x;
  int y;

  Object(int x, int y)
    : x(x), y(y)
  {
    
  }

  void foo()
  {
    std::printf("Object::foo %d\n", x);
  }

  void foo(int z)
  {
    std::printf("Object::foo %d, %d, %d\n", x, y, z);
  }
};

int
main()
{
  Object object(1, 2);

  object.foo();
  object.foo(3);
}

code.cpp.asm

Object::Object(int, int) proc near

    arg_0= qword ptr  10h
    arg_8= dword ptr  18h
    arg_10= dword ptr  20h

    push    rbp
    mov     rbp, rsp
    mov     [rbp+arg_0], rcx
    mov     [rbp+arg_8], edx
    mov     [rbp+arg_10], r8d
    mov     rax, [rbp+arg_0]
    mov     edx, [rbp+arg_8]
    mov     [rax], edx
    mov     rax, [rbp+arg_0]
    mov     edx, [rbp+arg_10]
    mov     [rax+4], edx
    nop
    pop     rbp
    retn
Object::Object endp

-------------------------------------------------------------------------------

Object::foo() proc near

    arg_0= qword ptr  10h

    push    rbp
    mov     rbp, rsp
    sub     rsp, 20h
    mov     [rbp+arg_0], rcx
    mov     rax, [rbp+arg_0]
    mov     eax, [rax]
    mov     edx, eax
    lea     rcx, aObjectFooD ; "Object::foo %d\n"
    call    sub_407A50
    nop
    add     rsp, 20h
    pop     rbp
    retn
Object::foo endp

-------------------------------------------------------------------------------

Object::foo(int) proc near

    arg_0= qword ptr  10h
    arg_8= dword ptr  18h

    push    rbp
    mov     rbp, rsp
    sub     rsp, 20h
    mov     [rbp+arg_0], rcx
    mov     [rbp+arg_8], edx
    mov     rax, [rbp+arg_0]
    mov     edx, [rax+4]
    mov     rax, [rbp+arg_0]
    mov     eax, [rax]
    mov     ecx, [rbp+arg_8]
    mov     r9d, ecx
    mov     r8d, edx
    mov     edx, eax
    lea     rcx, aObjectFooDDD ; "Object::foo %d, %d, %d\n"
    call    sub_407A50
    nop
    add     rsp, 20h
    pop     rbp
    retn
Object::foo endp

-------------------------------------------------------------------------------

main() proc near

    var_8= byte ptr -8

    push    rbp
    mov     rbp, rsp
    sub     rsp, 30h
    call    sub_401660
    lea     rax, [rbp+var_8]
    mov     r8d, 2
    mov     edx, 1
    mov     rcx, rax
    call    Object::Object(int, int)
    lea     rax, [rbp+var_8]
    mov     rcx, rax
    call    Object::foo()
    lea     rax, [rbp+var_8]
    mov     edx, 3
    mov     rcx, rax
    call    Object::foo(int)
    mov     eax, 0
    add     rsp, 30h
    pop     rbp
    retn
main endp