clang/test/CodeGenCXX/microsoft-abi-byval-vararg.cpp

   1 // RUN: %clang_cc1 -Wno-non-pod-varargs -emit-llvm %s -o - -triple=i686-pc-win32 -mconstructor-aliases -fno-rtti | FileCheck %s
   2
   3 #include <stdarg.h>
   4
   5 struct A {
   6   A(int a) : a(a) {}
   7   A(const A &o) : a(o.a) {}
   8   ~A() {}
   9   int a;
  10 };
  11
  12 int foo(A a, ...) {
  13   va_list ap;
  14   va_start(ap, a);
  15   int sum = 0;
  16   for (int i = 0; i < a.a; ++i)
  17     sum += va_arg(ap, int);
  18   va_end(ap);
  19   return sum;
  20 }
  21
  22 // CHECK-LABEL: define dso_local noundef i32 @"?foo@@YAHUA@@ZZ"(ptr inalloca(<{ %struct.A }>) %0, ...)
  23
  24 int main() {
  25   return foo(A(3), 1, 2, 3);
  26 }
  27 // CHECK-LABEL: define dso_local noundef i32 @main()
  28 // CHECK: %[[argmem:[^ ]*]] = alloca inalloca <{ %struct.A, i32, i32, i32 }>
  29 // CHECK: call noundef i32 (ptr, ...) @"?foo@@YAHUA@@ZZ"{{.*}}(ptr inalloca(<{ %struct.A, i32, i32, i32 }>) %[[argmem]])
  30
  31 void varargs_zero(...);
  32 void varargs_one(int, ...);
  33 void varargs_two(int, int, ...);
  34 void varargs_three(int, int, int, ...);
  35 void call_var_args() {
  36   A x(3);
  37   varargs_zero(x);
  38   varargs_one(1, x);
  39   varargs_two(1, 2, x);
  40   varargs_three(1, 2, 3, x);
  41 }
  42
  43 // CHECK-LABEL: define dso_local void @"?call_var_args@@YAXXZ"()
  44 // CHECK: call void {{.*varargs_zero.*}}(ptr inalloca(<{ %struct.A }>) %{{.*}})
  45 // CHECK: call void {{.*varargs_one.*}}(ptr inalloca(<{ i32, %struct.A }>) %{{.*}})
  46 // CHECK: call void {{.*varargs_two.*}}(ptr inalloca(<{ i32, i32, %struct.A }>) %{{.*}})
  47 // CHECK: call void {{.*varargs_three.*}}(ptr inalloca(<{ i32, i32, i32, %struct.A }>) %{{.*}})
  48
  49 // CHECK-LABEL: declare dso_local void @"?varargs_zero@@YAXZZ"(...)
  50 // CHECK-LABEL: declare dso_local void @"?varargs_one@@YAXHZZ"(i32 noundef, ...)
  51 // CHECK-LABEL: declare dso_local void @"?varargs_two@@YAXHHZZ"(i32 noundef, i32 noundef, ...)
  52 // CHECK-LABEL: declare dso_local void @"?varargs_three@@YAXHHHZZ"(i32 noundef, i32 noundef, i32 noundef, ...)