test/CodeGenCXX/warn-padded-packed.cpp

   1 // RUN: %clang_cc1 -triple=x86_64-none-none -Wpadded -Wpacked -verify %s -emit-llvm-only
   2
   3 struct S1 {
   4   char c;
   5   short s; // expected-warning {{padding struct 'S1' with 1 byte to align 's'}}
   6   long l; // expected-warning {{padding struct 'S1' with 4 bytes to align 'l'}}
   7 };
   8
   9 struct S2 { // expected-warning {{padding size of 'S2' with 3 bytes to alignment boundary}}
  10   int i;
  11   char c;
  12 };
  13
  14 struct S3 {
  15   char c;
  16   int i;
  17 } __attribute__((packed));
  18
  19 struct S4 {
  20   int i; // expected-warning {{packed attribute is unnecessary for 'i'}}
  21   char c;
  22 } __attribute__((packed));
  23
  24 struct S5 {
  25   char c;
  26   union {
  27     char c;
  28     int i;
  29   } u; // expected-warning {{padding struct 'S5' with 3 bytes to align 'u'}}
  30 };
  31
  32 struct S6 { // expected-warning {{padding size of 'S6' with 30 bits to alignment boundary}}
  33   int i : 2;
  34 };
  35
  36 struct S7 { // expected-warning {{padding size of 'S7' with 7 bytes to alignment boundary}}
  37   char c;
  38   virtual void m();
  39 };
  40
  41 struct B {
  42   char c;
  43 };
  44
  45 struct S8 : B {
  46   int i; // expected-warning {{padding struct 'S8' with 3 bytes to align 'i'}}
  47 };
  48
  49 struct S9 { // expected-warning {{packed attribute is unnecessary for 'S9'}}
  50   int x; // expected-warning {{packed attribute is unnecessary for 'x'}}
  51   int y; // expected-warning {{packed attribute is unnecessary for 'y'}}
  52 } __attribute__((packed));
  53
  54 struct S10 { // expected-warning {{packed attribute is unnecessary for 'S10'}}
  55   int x; // expected-warning {{packed attribute is unnecessary for 'x'}}
  56   char a,b,c,d;
  57 } __attribute__((packed));
  58
  59
  60 struct S11 {
  61   bool x;
  62   char a,b,c,d;
  63 } __attribute__((packed));
  64
  65 struct S12 {
  66   bool b : 1;
  67   char c; // expected-warning {{padding struct 'S12' with 7 bits to align 'c'}}
  68 };
  69
  70 struct S13 { // expected-warning {{padding size of 'S13' with 6 bits to alignment boundary}}
  71   char c;
  72   bool b : 10; // expected-warning {{size of bit-field 'b' (10 bits) exceeds the size of its type}}
  73 };
  74
  75 // The warnings are emitted when the layout of the structs is computed, so we have to use them.
  76 void f(S1*, S2*, S3*, S4*, S5*, S6*, S7*, S8*, S9*, S10*, S11*, S12*, S13*) { }