clang/test/PCH/delayed-template-with-pragma-pack.cpp

   1 // RUN: %clang_cc1 -triple x86_64-pc-windows-msvc -emit-pch -o %t.pch %s
   2 // RUN: %clang_cc1 -triple x86_64-pc-windows-msvc -fdelayed-template-parsing -emit-pch -o %t.delayed.pch %s
   3 // RUN: %clang_cc1 -triple x86_64-pc-windows-msvc -DMAIN_FILE \
   4 // RUN:   -include-pch %t.pch \
   5 // RUN:   -emit-llvm -verify -o - %s | FileCheck %s
   6 // RUN: %clang_cc1 -triple x86_64-pc-windows-msvc -DMAIN_FILE -fdelayed-template-parsing \
   7 // RUN:   -include-pch %t.delayed.pch \
   8 // RUN:   -emit-llvm -verify -o - %s | FileCheck %s
   9
  10 #ifndef MAIN_FILE
  11
  12 extern "C" void consume(int b);
  13
  14 template <int I>
  15 void function() {
  16 #pragma pack(push, 1)
  17   struct packedAt1 {
  18     char a;
  19     unsigned long long b;
  20     char c;
  21     unsigned long long d;
  22     // 18 bytes total
  23   };
  24 #pragma pack(push, slot1, 2)
  25   struct packedAt2 {
  26     char a; // +1 byte of padding
  27     unsigned long long b;
  28     char c; // +1 byte of padding
  29     unsigned long long d;
  30     // 20 bytes total
  31   };
  32 #pragma pack(push, 4)
  33   struct packedAt4 {
  34     char a; // +3 bytes of padding
  35     unsigned long long b;
  36     char c; // +3 bytes of padding
  37     unsigned long long d;
  38     // 24 bytes total
  39   };
  40 #pragma pack(push, 16)
  41   struct packedAt16 {
  42     char a; // +7 bytes of padding
  43     unsigned long long b;
  44     char c; // +7 bytes of padding
  45     unsigned long long d;
  46     // 32 bytes total
  47   };
  48 #pragma pack(pop, slot1) // This should return packing to 1 (established before push(slot1))
  49   struct packedAfterPopBackTo1 {
  50     char a;
  51     unsigned long long b;
  52     char c;
  53     unsigned long long d;
  54   };
  55 #pragma pack(pop)
  56
  57   consume(sizeof(packedAt1)); // 18
  58   consume(sizeof(packedAt2)); // 20
  59   consume(sizeof(packedAt4)); // 24
  60   consume(sizeof(packedAt16)); // 32
  61   consume(sizeof(packedAfterPopBackTo1)); // 18 again
  62 }
  63
  64 #else
  65
  66 // CHECK-LABEL: define linkonce_odr dso_local void @"??$function@$0A@@@YAXXZ"(
  67 // CHECK: call void @consume(i32 noundef 18)
  68 // CHECK-NEXT: call void @consume(i32 noundef 20)
  69 // CHECK-NEXT: call void @consume(i32 noundef 24)
  70 // CHECK-NEXT: call void @consume(i32 noundef 32)
  71 // CHECK-NEXT: call void @consume(i32 noundef 18)
  72 void foo() {
  73   function<0>();
  74 }
  75
  76 // expected-no-diagnostics
  77
  78 #endif