test/CodeGen/callback_pthread_create.c

// RUN: %clang_cc1 -O1 %s -S -emit-llvm -o - | FileCheck %s
// RUN: %clang_cc1 -O1 %s -S -emit-llvm -o - | opt -ipconstprop -S | FileCheck --check-prefix=IPCP %s

// CHECK: declare !callback ![[cid:[0-9]+]] {{.*}}i32 @pthread_create
// CHECK: ![[cid]] = !{![[cidb:[0-9]+]]}
// CHECK: ![[cidb]] = !{i64 2, i64 3, i1 false}

// Taken from test/Analysis/retain-release.m
//{
struct _opaque_pthread_t {};
struct _opaque_pthread_attr_t {};
typedef struct _opaque_pthread_t *__darwin_pthread_t;
typedef struct _opaque_pthread_attr_t __darwin_pthread_attr_t;
typedef __darwin_pthread_t pthread_t;
typedef __darwin_pthread_attr_t pthread_attr_t;

int pthread_create(pthread_t *, const pthread_attr_t *,
                   void *(*)(void *), void *);
//}

const int GlobalVar = 0;

static void *callee0(void *payload) {
// IPCP:      define internal i8* @callee0
// IPCP:        ret i8* null
  return payload;
}

static void *callee1(void *payload) {
// IPCP:      define internal i8* @callee1
// IPCP:        ret i8* bitcast (i32* @GlobalVar to i8*)
  return payload;
}

void foo() {
  pthread_t MyFirstThread;
  pthread_create(&MyFirstThread, 0, callee0, 0);

  pthread_t MySecondThread;
  pthread_create(&MySecondThread, 0, callee1, (void *)&GlobalVar);
}