clang/test/CodeGen/functions.c

// RUN: %clang_cc1 %s -triple i386-unknown-unknown -Wno-strict-prototypes -emit-llvm -o - -verify | FileCheck %s

int g();

int foo(int i) {
  return g(i);
}

int g(int i) {
  return g(i);
}

typedef void T(void);
void test3(T f) {
  f();
}

void f0(void) {}
// CHECK-LABEL: define{{.*}} void @f0()

void f1();
void f2(void) {
// CHECK: call void @f1()
  f1(1, 2, 3);
}
// CHECK-LABEL: define{{.*}} void @f1()
void f1() {}

// CHECK: define {{.*}} @f3{{\(\)|\(.*sret.*\)}}
struct foo { int X, Y, Z; } f3(void) {
  while (1) {}
}

// PR4423 - This shouldn't crash in codegen
void f4() {}
void f5(void) { f4(42); } //expected-warning {{too many arguments}}

// Qualifiers on parameter types shouldn't make a difference.
static void f6(const float f, const float g) {
}
void f7(float f, float g) {
  f6(f, g);
// CHECK: define{{.*}} void @f7(float{{.*}}, float{{.*}})
// CHECK: call void @f6(float{{.*}}, float{{.*}})
}

// PR6911 - incomplete function types
struct Incomplete;
void f8_callback(struct Incomplete);
void f8_user(void (*callback)(struct Incomplete));
void f8_test(void) {
  f8_user(&f8_callback);
// CHECK-LABEL: define{{.*}} void @f8_test()
// CHECK: call void @f8_user(ptr noundef @f8_callback)
// CHECK: declare void @f8_user(ptr noundef)
// CHECK: declare void @f8_callback()
}

// PR10204: don't crash
static void test9_helper(void) {}
void test9(void) {
  (void) test9_helper;
}

// PR88917: don't crash
int b();

int main() {
	return b(b);
	// CHECK: call i32 @b(ptr noundef @b)
}
int b(int (*f)()){
  return 0;
}
// CHECK-LABEL: define{{.*}} i32 @b(ptr noundef %f)