llvm-project/clang/test/SemaObjCXX/arc-overloading.mm

// RUN: %clang_cc1 -fobjc-nonfragile-abi -fsyntax-only -fobjc-arc -verify -fblocks %s

// Simple ownership conversions + diagnostics.
int &f0(id __strong const *); // expected-note{{candidate function not viable: 1st argument ('__weak id *') has __weak ownership, but parameter has __strong ownership}}

void test_f0() {
  id __strong *sip;
  id __strong const *csip;
  id __weak *wip;
  id __autoreleasing *aip;
  id __unsafe_unretained *uip;

  int &ir1 = f0(sip);
  int &ir2 = f0(csip);
  int &ir3 = f0(aip);
  int &ir4 = f0(uip);
  f0(wip); // expected-error{{no matching function for call to 'f0'}}
}

// Simple overloading
int &f1(id __strong const *);
float &f1(id __weak const *);

void test_f1() {
  id __strong *sip;
  id __strong const *csip;
  id __weak *wip;
  id __autoreleasing *aip;
  id __unsafe_unretained *uip;

  int &ir1 = f1(sip);
  int &ir2 = f1(csip);
  float &fr1 = f1(wip);
  int &ir3 = f1(aip);
  int &ir4 = f1(uip);
}

// Simple overloading
int &f2(id __strong const *); // expected-note{{candidate function}}
float &f2(id __autoreleasing const *); // expected-note{{candidate function}}

void test_f2() {
  id __strong *sip;
  id __strong const *csip;
  id __weak *wip;
  id __autoreleasing *aip;
  id __unsafe_unretained *uip;

  // Prefer non-ownership conversions to ownership conversions.
  int &ir1 = f2(sip);
  int &ir2 = f2(csip);
  float &fr1 = f2(aip);

  f2(uip); // expected-error{{call to 'f2' is ambiguous}}
}

// Writeback conversion
int &f3(id __autoreleasing *); // expected-note{{candidate function not viable: 1st argument ('__unsafe_unretained id *') has __unsafe_unretained ownership, but parameter has __autoreleasing ownership}}

void test_f3() {
  id __strong *sip;
  id __weak *wip;
  id __autoreleasing *aip;
  id __unsafe_unretained *uip;

  int &ir1 = f3(sip);
  int &ir2 = f3(wip);
  int &ir3 = f3(aip);
  f3(uip); // expected-error{{no matching function for call to 'f3'}}
}

// Writeback conversion vs. no conversion
int &f4(id __autoreleasing *);
float &f4(id __strong *);

void test_f4() {
  id __strong *sip;
  id __weak *wip;
  id __autoreleasing *aip;
  extern __weak id *weak_global_ptr;

  float &fr1 = f4(sip);
  int &ir1 = f4(wip);
  int &ir2 = f4(aip);
  int &ir3 = f4(weak_global_ptr); // expected-error{{passing address of non-local object to __autoreleasing parameter for write-back}}
}

// Writeback conversion vs. other conversion.
int &f5(id __autoreleasing *);
float &f5(id const __unsafe_unretained *);

void test_f5() {
  id __strong *sip;
  id __weak *wip;
  id __autoreleasing *aip;

  int &ir1 = f5(wip);
  float &fr1 = f5(sip);
  int &ir2 = f5(aip);
}

@interface A
@end

int &f6(id __autoreleasing *);
float &f6(id const __unsafe_unretained *);

void test_f6() {
  A* __strong *sip;
  A* __weak *wip;
  A* __autoreleasing *aip;

  int &ir1 = f6(wip);
  float &fr1 = f6(sip);
  int &ir2 = f6(aip);
}

// Reference binding
void f7(__strong id&); // expected-note{{candidate function not viable: 1st argument ('__weak id') has __weak ownership, but parameter has __strong ownership}} \
 // expected-note{{candidate function not viable: 1st argument ('__autoreleasing id') has __autoreleasing ownership, but parameter has __strong ownership}} \
 // expected-note{{candidate function not viable: 1st argument ('__unsafe_unretained id') has __unsafe_unretained ownership, but parameter has __strong ownership}}

void test_f7() {
  __strong id strong_id;
  __weak id weak_id;
  __autoreleasing id autoreleasing_id;
  __unsafe_unretained id unsafe_id;
  f7(strong_id);
  f7(weak_id); // expected-error{{no matching function for call to 'f7'}}
  f7(autoreleasing_id); // expected-error{{no matching function for call to 'f7'}}
  f7(unsafe_id); // expected-error{{no matching function for call to 'f7'}}
}

void f8(const __strong id&);

void test_f8() {
  __strong id strong_id;
  __weak id weak_id;
  __autoreleasing id autoreleasing_id;
  __unsafe_unretained id unsafe_id;

  f8(strong_id);
  f8(weak_id);
  f8(autoreleasing_id);
  f8(unsafe_id);
}

int &f9(__strong id&);
float &f9(const __autoreleasing id&);

void test_f9() {
  __strong id strong_id;
  __weak id weak_id;
  __autoreleasing id autoreleasing_id;
  __unsafe_unretained id unsafe_id;

  int &ir1 = f9(strong_id);
  float &fr1 = f9(autoreleasing_id);
  float &fr2 = f9(unsafe_id);
  float &fr2a = f9(weak_id);

  __strong A *strong_a;
  __weak A *weak_a;
  __autoreleasing A *autoreleasing_a;
  __unsafe_unretained A *unsafe_unretained_a;
  float &fr3 = f9(strong_a);
  float &fr4 = f9(autoreleasing_a);
  float &fr5 = f9(unsafe_unretained_a);
  float &fr6 = f9(weak_a);

  const __autoreleasing id& ar1 = strong_a;
  const __autoreleasing id& ar2 = autoreleasing_a;
  const __autoreleasing id& ar3 = unsafe_unretained_a;
  const __autoreleasing id& ar4 = weak_a;
}