clang/test/Sema/assign.c

   1 // RUN: %clang_cc1 -fsyntax-only -verify %s
   2
   3 void *test1(void) { return 0; }
   4
   5 void test2 (const struct {int a;} *x) {
   6   // expected-note@-1 {{variable 'x' declared const here}}
   7
   8   x->a = 10;
   9   // expected-error-re@-1 {{cannot assign to variable 'x' with const-qualified type 'const struct (unnamed struct at {{.*}}assign.c:5:19) *'}}
  10 }
  11
  12 typedef int arr[10];
  13 void test3(void) {
  14   const arr b;      // expected-note {{variable 'b' declared const here}}
  15   const int b2[10]; // expected-note {{variable 'b2' declared const here}}
  16   b[4] = 1;         // expected-error {{cannot assign to variable 'b' with const-qualified type 'const arr' (aka 'const int[10]')}}
  17   b2[4] = 1;        // expected-error {{cannot assign to variable 'b2' with const-qualified type 'const int[10]'}}
  18 }
  19
  20 typedef struct I {
  21   const int a; // expected-note 4{{nested data member 'a' declared const here}} \
  22                   expected-note 6{{data member 'a' declared const here}}
  23 } I;
  24 typedef struct J {
  25   struct I i;
  26 } J;
  27 typedef struct K {
  28   struct J *j;
  29 } K;
  30
  31 void testI(struct I i1, struct I i2) {
  32   i1 = i2; // expected-error {{cannot assign to variable 'i1' with const-qualified data member 'a'}}
  33 }
  34 void testJ1(struct J j1, struct J j2) {
  35   j1 = j2; // expected-error {{cannot assign to variable 'j1' with nested const-qualified data member 'a'}}
  36 }
  37 void testJ2(struct J j, struct I i) {
  38   j.i = i; // expected-error {{cannot assign to non-static data member 'i' with const-qualified data member 'a'}}
  39 }
  40 void testK1(struct K k, struct J j) {
  41   *(k.j) = j; // expected-error {{cannot assign to lvalue with nested const-qualified data member 'a'}}
  42 }
  43 void testK2(struct K k, struct I i) {
  44   k.j->i = i; // expected-error {{cannot assign to non-static data member 'i' with const-qualified data member 'a'}}
  45 }
  46
  47 void testI_(I i1, I i2) {
  48   i1 = i2; // expected-error {{cannot assign to variable 'i1' with const-qualified data member 'a'}}
  49 }
  50 void testJ1_(J j1, J j2) {
  51   j1 = j2; // expected-error {{cannot assign to variable 'j1' with nested const-qualified data member 'a'}}
  52 }
  53 void testJ2_(J j, I i) {
  54   j.i = i; // expected-error {{cannot assign to non-static data member 'i' with const-qualified data member 'a'}}
  55 }
  56 void testK1_(K k, J j) {
  57   *(k.j) = j; // expected-error {{cannot assign to lvalue with nested const-qualified data member 'a'}}
  58 }
  59 void testK2_(K k, I i) {
  60   k.j->i = i; // expected-error {{cannot assign to non-static data member 'i' with const-qualified data member 'a'}}
  61 }
  62
  63 // PR39946: Recursive checking of hasConstFields caused stack overflow.
  64 struct L { // expected-note {{definition of 'struct L' is not complete until the closing '}'}}
  65   struct L field; // expected-error {{field has incomplete type 'struct L'}}
  66 };
  67 void testL(struct L *l) {
  68   *l = 0; // expected-error {{assigning to 'struct L' from incompatible type 'int'}}
  69 }
  70
  71 // Additionally, this example overflowed the stack when figuring out the field.
  72 struct M1; // expected-note {{forward declaration of 'struct M1'}}
  73 struct M2 {
  74   //expected-note@+1 {{nested data member 'field' declared const here}}
  75   const struct M1 field; // expected-error {{field has incomplete type 'const struct M1'}}
  76 };
  77 struct M1 {
  78   struct M2 field;
  79 };
  80
  81 void testM(struct M1 *l) {
  82   *l = 0; // expected-error {{cannot assign to lvalue with nested const-qualified data member 'field'}}
  83 }
  84
  85 struct N1; // expected-note {{forward declaration of 'struct N1'}}
  86 struct N2 {
  87   struct N1 field; // expected-error {{field has incomplete type 'struct N1'}}
  88 };
  89 struct N1 {
  90   struct N2 field;
  91 };
  92
  93 void testN(struct N1 *l) {
  94   *l = 0; // expected-error {{assigning to 'struct N1' from incompatible type 'int'}}
  95 }