llvm/clang/test/CodeGenCXX/warn-all-padded-packed-packed-non-pod.cpp

// RUN: %clang_cc1 -triple=x86_64-none-none -Wpadded -Wpacked -Wno-padded-bitfield -verify=expected,top %s -emit-llvm-only
// RUN: %clang_cc1 -triple=x86_64-none-none -Wpadded -Wpacked -Wno-padded-bitfield -verify=expected,abi15 -fclang-abi-compat=15 %s -emit-llvm-only
// -Wpacked-non-pod itself should not emit the "packed attribute is unnecessary" warnings.
// RUN: %clang_cc1 -triple=x86_64-none-none -Wpacked-non-pod -verify=top %s -emit-llvm-only
// -Wall should not emit the "packed attribute is unnecessary" warnings without -Wpacked.
// RUN: %clang_cc1 -triple=x86_64-none-none -Wall -verify=top %s -emit-llvm-only


struct S1 {
  char c;
  short s; // expected-warning {{padding struct 'S1' with 1 byte to align 's'}}
  long l; // expected-warning {{padding struct 'S1' with 4 bytes to align 'l'}}
};

struct S2 { // expected-warning {{padding size of 'S2' with 3 bytes to alignment boundary}}
  int i;
  char c;
};

struct S3 {
  char c;
  int i;
} __attribute__((packed));

struct S4 {
  int i;
  char c;
} __attribute__((packed));

struct S5 {
  char c;
  union {
    char c;
    int i;
  } u; // expected-warning {{padding struct 'S5' with 3 bytes to align 'u'}}
};

struct S6 { // expected-warning {{padding size of 'S6' with 30 bits to alignment boundary}}
  int i : 2;
};

struct S7 { // expected-warning {{padding size of 'S7' with 7 bytes to alignment boundary}}
  char c;
  virtual void m();
};

struct B {
  char c;
};

struct S8 : B {
  int i; // expected-warning {{padding struct 'S8' with 3 bytes to align 'i'}}
};

struct S9 {
  int x;
  int y;
} __attribute__((packed));

struct S10 {
  int x;
  char a,b,c,d;
} __attribute__((packed));


struct S11 { // expected-warning {{packed attribute is unnecessary for 'S11'}}
  bool x;
  char a,b,c,d;
} __attribute__((packed));

struct S12 {
  bool b : 1;
  char c; // expected-warning {{padding struct 'S12' with 7 bits to align 'c'}}
};

struct S13 { // expected-warning {{padding size of 'S13' with 6 bits to alignment boundary}}
  char c;
  bool b : 10;
};

struct S14 { // expected-warning {{packed attribute is unnecessary for 'S14'}}
  char a,b,c,d;
} __attribute__((packed));

struct S15 { // expected-warning {{packed attribute is unnecessary for 'S15'}}
  struct S14 s;
  char a;
} __attribute__((packed));

struct S16 { // expected-warning {{padding size of 'S16' with 2 bytes to alignment boundary}} expected-warning {{packed attribute is unnecessary for 'S16'}}
  char a,b;
} __attribute__((packed, aligned(4)));

struct S17 {
  struct S16 s;
  char a,b;
} __attribute__((packed, aligned(2)));

struct S18 { // expected-warning {{padding size of 'S18' with 2 bytes to alignment boundary}} expected-warning {{packed attribute is unnecessary for 'S18'}}
  struct S16 s;
  char a,b;
} __attribute__((packed, aligned(4)));

struct S19 { // expected-warning {{packed attribute is unnecessary for 'S19'}}
  bool b;
  char a;
} __attribute__((packed, aligned(1)));

struct S20 {
  int i;
  char a;
} __attribute__((packed, aligned(1)));

struct S21 { // expected-warning {{padding size of 'S21' with 4 bits to alignment boundary}}
  unsigned char a : 6;
  unsigned char b : 6;
} __attribute__((packed, aligned(1)));

struct S22 { // expected-warning {{packed attribute is unnecessary for 'S22'}}
  unsigned char a : 4;
  unsigned char b : 4;
} __attribute__((packed));

struct S23 { // expected-warning {{padding size of 'S23' with 4 bits to alignment boundary}} expected-warning {{packed attribute is unnecessary for 'S23'}}
  unsigned char a : 2;
  unsigned char b : 2;
} __attribute__((packed));

struct S24 {
  unsigned char a : 6;
  unsigned char b : 6;
  unsigned char c : 6;
  unsigned char d : 6;
  unsigned char e : 6;
  unsigned char f : 6;
  unsigned char g : 6;
  unsigned char h : 6;
} __attribute__((packed));

struct S25 { // expected-warning {{padding size of 'S25' with 7 bits to alignment boundary}} expected-warning {{packed attribute is unnecessary for 'S25'}}
  unsigned char a;
  unsigned char b : 1;
} __attribute__((packed));

struct S26 { // expected-warning {{packed attribute is unnecessary for 'S26'}}
  unsigned char a : 1;
  unsigned char b; //expected-warning {{padding struct 'S26' with 7 bits to align 'b'}}
} __attribute__((packed));

struct S27 { // expected-warning {{padding size of 'S27' with 7 bits to alignment boundary}}
  unsigned char a : 1;
  unsigned char b : 8;
} __attribute__((packed));

struct S28_non_pod {
 protected:
  int i;
};
struct S28 {
  char c1;
  short s1;
  char c2;
  S28_non_pod p1; // top-warning {{not packing field 'p1' as it is non-POD for the purposes of layout}}
} __attribute__((packed));

struct S29_non_pod_align_1 {
 protected:
  char c;
};
struct S29 {
  S29_non_pod_align_1 p1;
  int i;
} __attribute__((packed)); // no warning
static_assert(alignof(S29) == 1, "");

struct S30 {
protected:
 short s;
} __attribute__((packed)); // no warning
struct S30_use { // abi15-warning {{packed attribute is unnecessary for 'S30_use'}}
  char c;
  S30 u;
} __attribute__((packed));
static_assert(sizeof(S30_use) == 3, "");

// The warnings are emitted when the layout of the structs is computed, so we have to use them.
void f(S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S13,
       S14, S15, S16, S17, S18, S19, S20, S21, S22, S23, S24, S25,
       S26, S27, S28, S29){}