163 lines
5.1 KiB
C
163 lines
5.1 KiB
C
/* PR 71831 - __builtin_object_size poor results with no optimization
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Verify that even without optimization __builtin_object_size result
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is folded into a constant and dead code that depends on it is
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eliminated. */
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/* { dg-do compile } */
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/* { dg-options "-O0 -fdump-tree-ssa" } */
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#define concat(a, b) a ## b
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#define CAT(a, b) concat (a, b)
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/* Create a symbol name unique to each tes and object size type. */
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#define SYM(type) CAT (CAT (CAT (failure_on_line_, __LINE__), _type_), type)
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/* References to the following undefined symbol which is unique for each
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test case are expected to be eliminated. */
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#define TEST_FAILURE(type) \
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do { \
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extern void SYM (type)(void); \
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SYM (type)(); \
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} while (0)
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#define bos(obj, type) __builtin_object_size (obj, type)
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#define size(obj, n) ((size_t)n == X ? sizeof *obj : (size_t)n)
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#define test(expect, type, obj) \
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do { \
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if (bos (obj, type) != size (obj, expect)) \
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TEST_FAILURE (type); \
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} while (0)
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#define FOLD_ALL(r0, r1, r2, r3, obj) \
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do { \
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test (r0, 0, obj); \
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test (r1, 1, obj); \
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test (r2, 2, obj); \
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test (r3, 3, obj); \
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} while (0)
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#define FOLD_0_2(r0, r1, r2, r3, obj) \
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do { \
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test (r0, 0, obj); \
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test (r2, 2, obj); \
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} while (0)
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/* For convenience. Substitute for 'sizeof object' in test cases where
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the size can vary from target to target. */
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#define X (size_t)0xdeadbeef
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typedef __SIZE_TYPE__ size_t;
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extern char ax[];
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char ax2[]; /* { dg-warning "assumed to have one element" } */
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extern char a0[0];
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static char a1[1];
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static char a2[2];
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static char a9[9];
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#if __SIZEOF_SHORT__ == 4
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extern short ia0[0];
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static short ia1[1];
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static short ia9[9];
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#elif __SIZEOF_INT__ == 4
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extern int ia0[0];
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static int ia1[1];
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static int ia9[9];
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#elif __SIZEOF_LONG__ == 4
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extern long ia0[0];
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static long ia1[1];
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static long ia9[9];
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#endif
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static char a2x2[2][2];
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static char a3x5[3][5];
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struct Sx { char n, a[]; } sx;
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struct S0 { char n, a[0]; } s0;
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struct S1 { char n, a[1]; } s1;
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struct S2 { char n, a[2]; } s2;
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struct S9 { char n, a[9]; } s9;
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struct S2x2 { char n, a[2][2]; } s2x2;
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struct S3x5 { char n, a[3][5]; } s3x5;
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static __attribute__ ((noclone, noinline)) void
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test_arrays ()
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{
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FOLD_ALL ( 1, 1, 1, 1, ax2);
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FOLD_ALL ( 1, 1, 1, 1, a1);
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FOLD_ALL ( 2, 2, 2, 2, a2);
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FOLD_ALL ( 9, 9, 9, 9, a9);
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FOLD_ALL ( 0, 0, 0, 0, a0);
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FOLD_ALL ( 1, 1, 1, 1, ax2);
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FOLD_ALL ( 0, 0, 0, 0, ia0);
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FOLD_ALL ( 4, 4, 4, 4, ia1);
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FOLD_ALL ( 36, 36, 36, 36, ia9);
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/* Not all results for multidimensional arrays make sense (see
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bug 77293). The expected results below simply reflect those
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obtained at -O2 (modulo the known limitations at -O1). */
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FOLD_ALL ( 4, 4, 4, 4, a2x2);
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FOLD_ALL ( 4, 4, 4, 4, &a2x2[0]);
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FOLD_ALL ( 4, 2, 4, 2, &a2x2[0][0]);
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FOLD_0_2 ( 0, F1 (0), 0, 0, &a2x2 + 1);
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FOLD_0_2 ( 2, F1 ( 2), 2, F3 ( 2), &a2x2[0] + 1);
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FOLD_0_2 ( 3, F1 ( 1), 3, F3 ( 3), &a2x2[0][0] + 1);
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FOLD_ALL ( 15, 15, 15, 15, a3x5);
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FOLD_ALL ( 15, 5, 15, 5, &a3x5[0][0] + 0);
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FOLD_0_2 ( 14, F1 ( 4), 14, F3 (14), &a3x5[0][0] + 1);
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FOLD_ALL ( 1, 1, 1, 1, a1 + 0);
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FOLD_0_2 ( 0, F1 ( 0), 0, 0, &a1 + 1);
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FOLD_ALL ( 2, 2, 2, 2, a2 + 0);
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FOLD_0_2 ( 1, F1 ( 1), 1, F3 ( 1), a2 + 1);
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FOLD_0_2 ( 0, F1 ( 0), 0, 0, a2 + 2);
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}
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static __attribute__ ((noclone, noinline)) void
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test_structs (void)
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{
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/* The expected size of a declared object with a flexible array member
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is sizeof sx in all __builtin_object_size types. */
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FOLD_ALL ( X, X, X, X, &sx);
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/* The expected size of a flexible array member of a declared object
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is zero. */
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FOLD_ALL ( 0, 0, 0, 0, sx.a);
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/* The expected size of a declared object with a zero-length array member
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is sizeof sx in all __builtin_object_size types. */
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FOLD_ALL ( X, X, X, X, &s0);
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/* The expected size of a zero-length array member of a declared object
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is zero. */
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FOLD_ALL ( 0, 0, 0, 0, s0.a);
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FOLD_ALL ( X, X, X, X, &s1);
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FOLD_ALL ( 1, 1, 1, 1, s1.a);
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FOLD_0_2 ( 0, F1 (0), 0, 0, s1.a + 1);
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FOLD_ALL ( X, X, X, X, &s9);
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FOLD_ALL ( 9, 9, 9, 9, s9.a);
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FOLD_ALL ( 9, 9, 9, 9, s9.a + 0);
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FOLD_0_2 ( 8, F1 ( 8), 8, F3 ( 8), s9.a + 1);
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FOLD_0_2 ( 7, F1 ( 7), 7, F3 ( 7), s9.a + 2);
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FOLD_0_2 ( 0, F1 ( 0), 0, F3 ( 0), s9.a + 9);
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}
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int
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main()
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{
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test_arrays ();
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test_structs ();
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return 0;
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}
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/* { dg-final { scan-tree-dump-not "failure_on_line" "ssa" } } */
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