linkage.cpp revision 88e37c2a8c7f52b01372e6794ab80caa75842d06 
1// This is an IR generation test because the calculation of visibility
2// during IR gen will cause linkage to be implicitly recomputed and
3// compared against the earlier cached value.  If we had a way of
4// testing linkage directly in Sema, that would be better.
5
6// RUN: %clang_cc1 -Werror -triple x86_64-apple-darwin10 -emit-llvm %s -o - | FileCheck %s
7
8// PR8926
9namespace test0 {
10  typedef struct {
11    void *foo() { return 0; }
12  } A;
13
14  // CHECK: define linkonce_odr i8* @_ZN5test01A3fooEv(
15
16  void test(A *a) {
17    a->foo();
18  }
19}
20
21namespace test1 {
22  typedef struct {
23    template <unsigned n> void *foo() { return 0; }
24
25    void foo() {
26      foo<0>();
27    }
28  } A;
29
30  // CHECK: define linkonce_odr void @_ZN5test11A3fooEv(
31  // another at the end
32
33  void test(A *a) {
34    a->foo();
35  }
36}
37
38namespace test2 {
39  typedef struct {
40    template <unsigned n> struct B {
41      void *foo() { return 0; }
42    };
43
44    void foo(B<0> *b) {
45      b->foo();
46    }
47  } A;
48
49  // CHECK: define linkonce_odr void @_ZN5test21A3fooEPNS0_1BILj0EEE(
50
51  void test(A *a) {
52    a->foo(0);
53  }
54}
55
56namespace test3 {
57  namespace { struct A {}; }
58
59  // CHECK: define internal void @_ZN5test34testENS_12_GLOBAL__N_11AE(
60  void test(A a) {}
61  void force() { test(A()); }
62
63  // CHECK: define void @test3(
64  extern "C" void test3(A a) {}
65}
66
67namespace {
68  // CHECK: define void @test4(
69  extern "C" void test4(void) {}
70}
71
72// PR9316: Ensure that even non-namespace-scope function declarations in
73// a C declaration context respect that over the anonymous namespace.
74extern "C" {
75  namespace {
76    struct X {
77      int f() {
78        extern int g();
79        extern int a;
80
81        // Test both for mangling in the code generation and warnings from use
82        // of internal, undefined names via -Werror.
83        // CHECK: call i32 @g(
84        // CHECK: load i32* @a,
85        return g() + a;
86      }
87    };
88  }
89  // Force the above function to be emitted by codegen.
90  int test(X& x) {
91    return x.f();
92  }
93}
94
95// CHECK: define linkonce_odr i8* @_ZN5test21A1BILj0EE3fooEv(
96// CHECK: define linkonce_odr i8* @_ZN5test11A3fooILj0EEEPvv(
97
98namespace test5 {
99  struct foo {
100  };
101  extern "C" {
102    const foo bar[]  = {
103    };
104  }
105}
106