clang/test/CodeGen/x64-microsoft-arguments.cpp

   1 // RUN: %clang_cc1 -triple x86_64-windows-msvc -ffreestanding -emit-llvm -O0 \
   2 // RUN: -x c++ -o - %s | FileCheck %s
   3
   4 int global_i = 0;
   5
   6 // Pass and return object with a reference type (pass directly, return indirectly).
   7 // CHECK: define dso_local void @"?f1@@YA?AUS1@@XZ"(ptr dead_on_unwind noalias writable sret(%struct.S1) align 8 {{.*}})
   8 // CHECK: call void @"?func1@@YA?AUS1@@U1@@Z"(ptr dead_on_unwind writable sret(%struct.S1) align 8 {{.*}}, i64 {{.*}})
   9 struct S1 {
  10   int& r;
  11 };
  12
  13 S1 func1(S1 x);
  14 S1 f1() {
  15   S1 x{ global_i };
  16   return func1(x);
  17 }
  18
  19 // Pass and return object with a reference type within an inner struct (pass directly, return indirectly).
  20 // CHECK: define dso_local void @"?f2@@YA?AUS2@@XZ"(ptr dead_on_unwind noalias writable sret(%struct.S2) align 8 {{.*}})
  21 // CHECK: call void @"?func2@@YA?AUS2@@U1@@Z"(ptr dead_on_unwind writable sret(%struct.S2) align 8 {{.*}}, i64 {{.*}})
  22 struct Inner {
  23   int& r;
  24 };
  25
  26 struct S2 {
  27   Inner i;
  28 };
  29
  30 S2 func2(S2 x);
  31 S2 f2() {
  32   S2 x{ { global_i } };
  33   return func2(x);
  34 }
  35
  36 // Pass and return object with a reference type (pass directly, return indirectly).
  37 // CHECK: define dso_local void @"?f3@@YA?AUS3@@XZ"(ptr dead_on_unwind noalias writable sret(%struct.S3) align 8 {{.*}})
  38 // CHECK: call void @"?func3@@YA?AUS3@@U1@@Z"(ptr dead_on_unwind writable sret(%struct.S3) align 8 {{.*}}, i64 {{.*}})
  39 struct S3 {
  40   const int& r;
  41 };
  42
  43 S3 func3(S3 x);
  44 S3 f3() {
  45   S3 x{ global_i };
  46   return func3(x);
  47 }
  48
  49 // Pass and return object with a reference type within an inner struct (pass directly, return indirectly).
  50 // CHECK: define dso_local void @"?f4@@YA?AUS4@@XZ"(ptr dead_on_unwind noalias writable sret(%struct.S4) align 8 {{.*}})
  51 // CHECK: call void @"?func4@@YA?AUS4@@U1@@Z"(ptr dead_on_unwind writable sret(%struct.S4) align 8 {{.*}}, i64 {{.*}})
  52 struct InnerConst {
  53   const int& r;
  54 };
  55
  56 struct S4 {
  57   InnerConst i;
  58 };
  59
  60 S4 func4(S4 x);
  61 S4 f4() {
  62   S4 x{ { global_i } };
  63   return func4(x);
  64 }
  65
  66 // Pass and return an object with an explicitly deleted copy assignment operator (pass directly, return indirectly).
  67 // CHECK: define dso_local void @"?f5@@YA?AUS5@@XZ"(ptr dead_on_unwind noalias writable sret(%struct.S5) align 4 {{.*}})
  68 // CHECK: call void @"?func5@@YA?AUS5@@U1@@Z"(ptr dead_on_unwind writable sret(%struct.S5) align 4 {{.*}}, i32 {{.*}})
  69 struct S5 {
  70   S5& operator=(const S5&) = delete;
  71   int i;
  72 };
  73
  74 S5 func5(S5 x);
  75 S5 f5() {
  76   S5 x{ 1 };
  77   return func5(x);
  78 }
  79
  80 // Pass and return an object with an explicitly defaulted copy assignment operator that is implicitly deleted (pass directly, return indirectly).
  81 // CHECK: define dso_local void @"?f6@@YA?AUS6@@XZ"(ptr dead_on_unwind noalias writable sret(%struct.S6) align 8 {{.*}})
  82 // CHECK: call void @"?func6@@YA?AUS6@@U1@@Z"(ptr dead_on_unwind writable sret(%struct.S6) align 8 {{.*}}, i64 {{.*}})
  83 struct S6 {
  84   S6& operator=(const S6&) = default;
  85   int& i;
  86 };
  87
  88 S6 func6(S6 x);
  89 S6 f6() {
  90   S6 x{ global_i };
  91   return func6(x);
  92 }