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For APCS the alignment of bitfield types is *not* respected when laying out 

structures.  Alignment can be enforced with the use of anonymous bitfields 
(e.g., int :0), but this is not currently supported.  Add this test case to 
document the current state, which will hopefully be fixed shortly. 

llvm-svn: 136848
This commit is contained in:
Chad Rosier 2011-08-04 00:19:13 +00:00
parent c27b2870d8
commit 6088393248
1 changed files with 115 additions and 0 deletions
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115
clang/test/CodeGen/arm-apcs-zerolength-bitfield.c Normal file
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// RUN: %clang_cc1 -target-abi apcs-gnu -triple armv7-apple-darwin10 %s -verify
#include <stddef.h>
struct t1
{
int foo : 1;
char : 0;
char bar;
};
static int arr1_offset[(offsetof(struct t1, bar) == 1) ? 0 : -1];
static int arr1_sizeof[(sizeof(struct t1) == 2) ? 0 : -1];
struct t2
{
int foo : 1;
short : 0;
char bar;
};
static int arr2_offset[(offsetof(struct t2, bar) == 1) ? 0 : -1];
static int arr2_sizeof[(sizeof(struct t2) == 2) ? 0 : -1];
struct t3
{
int foo : 1;
int : 0;
char bar;
};
static int arr3_offset[(offsetof(struct t3, bar) == 1) ? 0 : -1];
static int arr3_sizeof[(sizeof(struct t3) == 2) ? 0 : -1];
struct t4
{
int foo : 1;
long : 0;
char bar;
};
static int arr4_offset[(offsetof(struct t4, bar) == 1) ? 0 : -1];
static int arr4_sizeof[(sizeof(struct t4) == 2) ? 0 : -1];
struct t5
{
int foo : 1;
long long : 0;
char bar;
};
static int arr5_offset[(offsetof(struct t5, bar) == 1) ? 0 : -1];
static int arr5_sizeof[(sizeof(struct t5) == 2) ? 0 : -1];
struct t6
{
int foo : 1;
char : 0;
char bar : 1;
char bar2;
};
static int arr6_offset[(offsetof(struct t6, bar2) == 1) ? 0 : -1];
static int arr6_sizeof[(sizeof(struct t6) == 2) ? 0 : -1];
struct t7
{
int foo : 1;
short : 0;
char bar1 : 1;
char bar2;
};
static int arr7_offset[(offsetof(struct t7, bar2) == 1) ? 0 : -1];
static int arr7_sizeof[(sizeof(struct t7) == 2) ? 0 : -1];
struct t8
{
int foo : 1;
int : 0;
char bar1 : 1;
char bar2;
};
static int arr8_offset[(offsetof(struct t8, bar2) == 1) ? 0 : -1];
static int arr8_sizeof[(sizeof(struct t8) == 2) ? 0 : -1];
struct t9
{
int foo : 1;
long : 0;
char bar1 : 1;
char bar2;
};
static int arr9_offset[(offsetof(struct t9, bar2) == 1) ? 0 : -1];
static int arr9_sizeof[(sizeof(struct t9) == 2) ? 0 : -1];
struct t10
{
int foo : 1;
long long : 0;
char bar1 : 1;
char bar2;
};
static int arr10_offset[(offsetof(struct t10, bar2) == 1) ? 0 : -1];
static int arr10_sizeof[(sizeof(struct t10) == 2) ? 0 : -1];
struct t11
{
int foo : 1;
long long : 0;
char : 0;
char bar1 : 1;
char bar2;
};
static int arr11_offset[(offsetof(struct t11, bar2) == 1) ? 0 : -1];
static int arr11_sizeof[(sizeof(struct t11) == 2) ? 0 : -1];
int main() {
return 0;
}