openmp: Add alloc_align attribute to omp_aligned_*alloc and testcase for omp_realloc

This patch adds alloc_align attribute to omp_aligned_{,c}alloc so that if
the first argument is constant, GCC can assume requested alignment.

Additionally, it adds testsuite coverage for omp_realloc which I haven't
managed to write in the patch from yesterday.

2021-10-01  Jakub Jelinek  <jakub@redhat.com>

	* omp.h.in (omp_aligned_alloc, omp_aligned_calloc): Add
	__alloc_align__ (1) attribute.
	* testsuite/libgomp.c-c++-common/alloc-9.c: New test.

libgomp/omp.h.in

@@ -306,7 +306,7 @@ extern void *omp_aligned_alloc (__SIZE_TYPE__, __SIZE_TYPE__,
 				omp_allocator_handle_t
 				__GOMP_DEFAULT_NULL_ALLOCATOR)
   __GOMP_NOTHROW __attribute__((__malloc__, __malloc__ (omp_free),
-				__alloc_size__ (2)));
+				__alloc_size__ (2), __alloc_align__ (1)));
 extern void *omp_calloc (__SIZE_TYPE__, __SIZE_TYPE__,
 			 omp_allocator_handle_t __GOMP_DEFAULT_NULL_ALLOCATOR)
   __GOMP_NOTHROW __attribute__((__malloc__, __malloc__ (omp_free),
@@ -315,7 +315,7 @@ extern void *omp_aligned_calloc (__SIZE_TYPE__, __SIZE_TYPE__, __SIZE_TYPE__,
 				 omp_allocator_handle_t
 				 __GOMP_DEFAULT_NULL_ALLOCATOR)
   __GOMP_NOTHROW __attribute__((__malloc__, __malloc__ (omp_free),
-				__alloc_size__ (2, 3)));
+				__alloc_size__ (2, 3), __alloc_align__ (1)));
 extern void *omp_realloc (void *, __SIZE_TYPE__,
 			  omp_allocator_handle_t __GOMP_DEFAULT_NULL_ALLOCATOR,
 			  omp_allocator_handle_t __GOMP_DEFAULT_NULL_ALLOCATOR)

libgomp/testsuite/libgomp.c-c++-common/alloc-9.c

+#include <omp.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+const omp_alloctrait_t traits2[]
+= { { omp_atk_alignment, 16 },
+    { omp_atk_sync_hint, omp_atv_default },
+    { omp_atk_access, omp_atv_default },
+    { omp_atk_pool_size, 1024 },
+    { omp_atk_fallback, omp_atv_default_mem_fb },
+    { omp_atk_partition, omp_atv_environment } };
+omp_alloctrait_t traits3[]
+= { { omp_atk_sync_hint, omp_atv_uncontended },
+    { omp_atk_alignment, 32 },
+    { omp_atk_access, omp_atv_all },
+    { omp_atk_pool_size, 512 },
+    { omp_atk_fallback, omp_atv_allocator_fb },
+    { omp_atk_fb_data, 0 },
+    { omp_atk_partition, omp_atv_default } };
+const omp_alloctrait_t traits4[]
+= { { omp_atk_alignment, 128 },
+    { omp_atk_pool_size, 1024 },
+    { omp_atk_fallback, omp_atv_null_fb } };
+
+int
+main ()
+{
+  int *volatile p = (int *) omp_alloc (3 * sizeof (int), omp_default_mem_alloc);
+  int *volatile q;
+  int *volatile r;
+  omp_alloctrait_t traits[3]
+    = { { omp_atk_alignment, 64 },
+	{ omp_atk_fallback, omp_atv_null_fb },
+	{ omp_atk_pool_size, 4096 } };
+  omp_alloctrait_t traits5[2]
+    = { { omp_atk_fallback, omp_atv_null_fb },
+	{ omp_atk_pool_size, 4096 } };
+  omp_allocator_handle_t a, a2;
+
+  if ((((uintptr_t) p) % __alignof (int)) != 0)
+    abort ();
+  p[0] = 1;
+  p[1] = 2;
+  p[2] = 3;
+  p = (int *) omp_realloc (p, 4 * sizeof (int), omp_default_mem_alloc, omp_default_mem_alloc);
+  if ((((uintptr_t) p) % __alignof (int)) != 0 || p[0] != 1 || p[1] != 2 || p[2] != 3)
+    abort ();
+  p[0] = 4;
+  p[1] = 5;
+  p[2] = 6;
+  p[3] = 7;
+  p = (int *) omp_realloc (p, 2 * sizeof (int), omp_default_mem_alloc, omp_default_mem_alloc);
+  if ((((uintptr_t) p) % __alignof (int)) != 0 || p[0] != 4 || p[1] != 5)
+    abort ();
+  p[0] = 8;
+  p[1] = 9;
+  if (omp_realloc (p, 0, omp_null_allocator, omp_default_mem_alloc) != NULL)
+    abort ();
+  p = (int *) omp_realloc (NULL, 2 * sizeof (int), omp_default_mem_alloc, omp_null_allocator);
+  if ((((uintptr_t) p) % __alignof (int)) != 0)
+    abort ();
+  p[0] = 1;
+  p[1] = 2;
+  p = (int *) omp_realloc (p, 5 * sizeof (int), omp_default_mem_alloc, omp_default_mem_alloc);
+  if ((((uintptr_t) p) % __alignof (int)) != 0 || p[0] != 1 || p[1] != 2)
+    abort ();
+  p[0] = 3;
+  p[1] = 4;
+  p[2] = 5;
+  p[3] = 6;
+  p[4] = 7;
+  omp_free (p, omp_null_allocator);
+  omp_set_default_allocator (omp_default_mem_alloc);
+  if (omp_realloc (NULL, 0, omp_null_allocator, omp_null_allocator) != NULL)
+    abort ();
+  p = (int *) omp_alloc (sizeof (int), omp_null_allocator);
+  if ((((uintptr_t) p) % __alignof (int)) != 0)
+    abort ();
+  p[0] = 3;
+  p = (int *) omp_realloc (p, 3 * sizeof (int), omp_null_allocator, omp_null_allocator);
+  if ((((uintptr_t) p) % __alignof (int)) != 0 || p[0] != 3)
+    abort ();
+  p[0] = 4;
+  p[1] = 5;
+  p[2] = 6;
+  if (omp_realloc (p, 0, omp_null_allocator, omp_get_default_allocator ()) != NULL)
+    abort ();
+  a = omp_init_allocator (omp_default_mem_space, 3, traits);
+  if (a == omp_null_allocator)
+    abort ();
+  p = (int *) omp_alloc (sizeof (int), a);
+  if ((((uintptr_t) p) % 64) != 0)
+    abort ();
+  p[0] = 7;
+  p = (int *) omp_realloc (p, 3072, a, a);
+  if ((((uintptr_t) p) % 64) != 0 || p[0] != 7)
+    abort ();
+  p[0] = 1;
+  p[3071 / sizeof (int)] = 2;
+  q = (int *) omp_alloc (sizeof (int), a);
+  if ((((uintptr_t) q) % 64) != 0)
+    abort ();
+  q[0] = 8;
+  if (omp_realloc (q, 3072, a, a) != NULL)
+    abort ();
+  omp_free (p, a);
+  omp_free (q, a);
+  p = (int *) omp_alloc (sizeof (int), a);
+  p[0] = 42;
+  p = (int *) omp_realloc (p, 3072, a, a);
+  if (p[0] != 42)
+    abort ();
+  p[0] = 3;
+  p[3071 / sizeof (int)] = 4;
+  omp_realloc (p, 0, omp_null_allocator, omp_null_allocator);
+  omp_set_default_allocator (a);
+  if (omp_get_default_allocator () != a)
+    abort ();
+  p = (int *) omp_alloc (31, omp_null_allocator);
+  if (p == NULL)
+    abort ();
+  p = (int *) omp_realloc (p, 3072, omp_null_allocator, omp_null_allocator);
+  if (p == NULL)
+    abort ();
+  q = (int *) omp_alloc (sizeof (int), omp_null_allocator);
+  if (q == NULL)
+    abort ();
+  if (omp_realloc (q, 3072, omp_null_allocator, omp_null_allocator) != NULL)
+    abort ();
+  omp_free (p, a);
+  omp_free (q, a);
+  omp_destroy_allocator (a);
+
+  a = omp_init_allocator (omp_default_mem_space, 2, traits5);
+  if (a == omp_null_allocator)
+    abort ();
+  omp_set_default_allocator (a);
+  if (omp_get_default_allocator () != a)
+    abort ();
+  p = (int *) omp_alloc (3071, omp_null_allocator);
+  if (p == NULL)
+    abort ();
+  p = (int *) omp_realloc (p, 3072, omp_null_allocator, omp_null_allocator);
+  if (p == NULL)
+    abort ();
+  q = (int *) omp_alloc (sizeof (int), omp_null_allocator);
+  if (q == NULL)
+    abort ();
+  if (omp_realloc (q, 3072, omp_null_allocator, omp_null_allocator) != NULL)
+    abort ();
+  omp_free (p, a);
+  omp_free (q, a);
+  omp_destroy_allocator (a);
+
+  a = omp_init_allocator (omp_default_mem_space,
+			  sizeof (traits2) / sizeof (traits2[0]),
+			  traits2);
+  if (a == omp_null_allocator)
+    abort ();
+  if (traits3[5].key != omp_atk_fb_data)
+    abort ();
+  traits3[5].value = (uintptr_t) a;
+  a2 = omp_init_allocator (omp_default_mem_space,
+			   sizeof (traits3) / sizeof (traits3[0]),
+			   traits3);
+  if (a2 == omp_null_allocator)
+    abort ();
+  p = (int *) omp_alloc (sizeof (int), a2);
+  if ((((uintptr_t) p) % 32) != 0)
+    abort ();
+  p[0] = 84;
+  p = (int *) omp_realloc (p, 380, a2, a2);
+  if ((((uintptr_t) p) % 32) != 0 || p[0] != 84)
+    abort ();
+  p[0] = 5;
+  p[379 / sizeof (int)] = 6;
+  q = (int *) omp_alloc (sizeof (int), a2);
+  if ((((uintptr_t) q) % 32) != 0)
+    abort ();
+  q[0] = 42;
+  q = (int *) omp_realloc (q, 768, a2, a2);
+  if ((((uintptr_t) q) % 16) != 0 || q[0] != 42)
+    abort ();
+  q[0] = 7;
+  q[767 / sizeof (int)] = 8;
+  r = (int *) omp_realloc (NULL, 512, a2, omp_null_allocator);
+  if ((((uintptr_t) r) % __alignof (int)) != 0)
+    abort ();
+  r[0] = 9;
+  r[511 / sizeof (int)] = 10;
+  omp_free (p, omp_null_allocator);
+  omp_free (q, a2);
+  omp_free (r, omp_null_allocator);
+  p = (int *) omp_alloc (sizeof (int), a2);
+  if ((((uintptr_t) p) % 32) != 0)
+    abort ();
+  p[0] = 85;
+  p = (int *) omp_realloc (p, 420, a, a2);
+  if ((((uintptr_t) p) % 16) != 0 || p[0] != 85)
+    abort ();
+  p[0] = 5;
+  p[419 / sizeof (int)] = 6;
+  q = (int *) omp_alloc (sizeof (int), a);
+  if ((((uintptr_t) q) % 16) != 0)
+    abort ();
+  q[0] = 43;
+  q = (int *) omp_realloc (q, 420, a2, a);
+  if ((((uintptr_t) q) % 32) != 0 || q[0] != 43)
+    abort ();
+  q[0] = 44;
+  q[419 / sizeof (int)] = 8;
+  q = (int *) omp_realloc (q, 768, a2, a2);
+  if ((((uintptr_t) q) % 16) != 0 || q[0] != 44)
+    abort ();
+  q[0] = 7;
+  q[767 / sizeof (int)] = 8;
+  omp_free (p, omp_null_allocator);
+  omp_free (q, a2);
+  omp_destroy_allocator (a2);
+  omp_destroy_allocator (a);
+
+  a = omp_init_allocator (omp_default_mem_space,
+			  sizeof (traits4) / sizeof (traits4[0]),
+			  traits4);
+  if (a == omp_null_allocator)
+    abort ();
+  if (traits3[5].key != omp_atk_fb_data)
+    abort ();
+  traits3[5].value = (uintptr_t) a;
+  a2 = omp_init_allocator (omp_default_mem_space,
+			   sizeof (traits3) / sizeof (traits3[0]),
+			   traits3);
+  if (a2 == omp_null_allocator)
+    abort ();
+  omp_set_default_allocator (a2);
+#ifdef __cplusplus
+  p = static_cast <int *> (omp_realloc (NULL, 420));
+#else
+  p = (int *) omp_realloc (NULL, 420, omp_null_allocator, omp_null_allocator);
+#endif
+  if ((((uintptr_t) p) % 32) != 0)
+    abort ();
+  p[0] = 5;
+  p[419 / sizeof (int)] = 6;
+  q = (int *) omp_realloc (NULL, sizeof (int), omp_null_allocator, omp_null_allocator);
+  if ((((uintptr_t) q) % 32) != 0)
+    abort ();
+  q[0] = 99;
+  q = (int *) omp_realloc (q, 700, omp_null_allocator, omp_null_allocator);
+  if ((((uintptr_t) q) % 128) != 0 || q[0] != 99)
+    abort ();
+  q[0] = 7;
+  q[699 / sizeof (int)] = 8;
+  if (omp_realloc (NULL, 768, omp_null_allocator, omp_null_allocator) != NULL)
+    abort ();
+#ifdef __cplusplus
+  omp_free (p);
+  if (omp_realloc (q, 0) != NULL)
+    abort ();
+  omp_free (NULL);
+#else
+  omp_free (p, omp_null_allocator);
+  if (omp_realloc (q, 0, omp_null_allocator, omp_null_allocator) != NULL)
+    abort ();
+  omp_free (NULL, omp_null_allocator);
+#endif
+  omp_free (NULL, omp_null_allocator);
+  omp_destroy_allocator (a2);
+  omp_destroy_allocator (a);
+  return 0;
+}