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Libgomp magic offset value self-documentation

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2019-10-02  Julian Brown  <julian@codesourcery.com>
	    Cesar Philippidis  <cesar@codesourcery.com>

	libgomp/
	* libgomp.h (OFFSET_INLINED, OFFSET_POINTER, OFFSET_STRUCT): Define.
	* target.c (FIELD_TGT_EMPTY): Define.
	(gomp_map_val): Use OFFSET_* macros instead of magic constants.  Write
	as switch instead of list of ifs.
	(gomp_map_vars_internal): Use OFFSET_* and FIELD_TGT_EMPTY macros.

Co-Authored-By: Cesar Philippidis <cesar@codesourcery.com>

From-SVN: r276519
This commit is contained in:
Julian Brown 2019-10-03 17:48:36 +00:00 committed by Julian Brown
parent 5dbe01a1ff
commit 6c7e076b74
3 changed files with 41 additions and 17 deletions
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9
libgomp/ChangeLog
View File

@ -1,3 +1,12 @@
2019-10-02 Julian Brown <julian@codesourcery.com>
Cesar Philippidis <cesar@codesourcery.com>
* libgomp.h (OFFSET_INLINED, OFFSET_POINTER, OFFSET_STRUCT): Define.
* target.c (FIELD_TGT_EMPTY): Define.
(gomp_map_val): Use OFFSET_* macros instead of magic constants. Write
as switch instead of list of ifs.
(gomp_map_vars_internal): Use OFFSET_* and FIELD_TGT_EMPTY macros.
2019-10-02 Andreas Tobler <andreast@gcc.gnu.org>
* testsuite/libgomp.oacc-c-c++-common/loop-default.h: Remove alloca.h

5
libgomp/libgomp.h
View File

@ -903,6 +903,11 @@ struct target_mem_desc {
artificial pointer to "omp declare target link" object. */
#define REFCOUNT_LINK (~(uintptr_t) 1)
/* Special offset values. */
#define OFFSET_INLINED (~(uintptr_t) 0)
#define OFFSET_POINTER (~(uintptr_t) 1)
#define OFFSET_STRUCT (~(uintptr_t) 2)
struct splay_tree_key_s {
/* Address of the host object. */
uintptr_t host_start;

44
libgomp/target.c
View File

@ -44,6 +44,8 @@
#include "plugin-suffix.h"
#endif
#define FIELD_TGT_EMPTY (~(size_t) 0)
static void gomp_target_init (void);
/* The whole initialization code for offloading plugins is only run one. */
@ -497,17 +499,25 @@ gomp_map_val (struct target_mem_desc *tgt, void **hostaddrs, size_t i)
return tgt->list[i].key->tgt->tgt_start
+ tgt->list[i].key->tgt_offset
+ tgt->list[i].offset;
if (tgt->list[i].offset == ~(uintptr_t) 0)
return (uintptr_t) hostaddrs[i];
if (tgt->list[i].offset == ~(uintptr_t) 1)
return 0;
if (tgt->list[i].offset == ~(uintptr_t) 2)
return tgt->list[i + 1].key->tgt->tgt_start
+ tgt->list[i + 1].key->tgt_offset
+ tgt->list[i + 1].offset
+ (uintptr_t) hostaddrs[i]
- (uintptr_t) hostaddrs[i + 1];
return tgt->tgt_start + tgt->list[i].offset;
switch (tgt->list[i].offset)
{
case OFFSET_INLINED:
return (uintptr_t) hostaddrs[i];
case OFFSET_POINTER:
return 0;
case OFFSET_STRUCT:
return tgt->list[i + 1].key->tgt->tgt_start
+ tgt->list[i + 1].key->tgt_offset
+ tgt->list[i + 1].offset
+ (uintptr_t) hostaddrs[i]
- (uintptr_t) hostaddrs[i + 1];
default:
return tgt->tgt_start + tgt->list[i].offset;
}
}
static inline __attribute__((always_inline)) struct target_mem_desc *
@ -575,7 +585,7 @@ gomp_map_vars_internal (struct gomp_device_descr *devicep,
|| (kind & typemask) == GOMP_MAP_FIRSTPRIVATE_INT)
{
tgt->list[i].key = NULL;
tgt->list[i].offset = ~(uintptr_t) 0;
tgt->list[i].offset = OFFSET_INLINED;
continue;
}
else if ((kind & typemask) == GOMP_MAP_USE_DEVICE_PTR)
@ -596,7 +606,7 @@ gomp_map_vars_internal (struct gomp_device_descr *devicep,
cur_node.host_end = (uintptr_t) hostaddrs[last]
+ sizes[last];
tgt->list[i].key = NULL;
tgt->list[i].offset = ~(uintptr_t) 2;
tgt->list[i].offset = OFFSET_STRUCT;
splay_tree_key n = splay_tree_lookup (mem_map, &cur_node);
if (n == NULL)
{
@ -629,7 +639,7 @@ gomp_map_vars_internal (struct gomp_device_descr *devicep,
else if ((kind & typemask) == GOMP_MAP_ALWAYS_POINTER)
{
tgt->list[i].key = NULL;
tgt->list[i].offset = ~(uintptr_t) 1;
tgt->list[i].offset = OFFSET_POINTER;
has_firstprivate = true;
continue;
}
@ -659,7 +669,7 @@ gomp_map_vars_internal (struct gomp_device_descr *devicep,
if (!n)
{
tgt->list[i].key = NULL;
tgt->list[i].offset = ~(uintptr_t) 1;
tgt->list[i].offset = OFFSET_POINTER;
continue;
}
}
@ -884,12 +894,12 @@ gomp_map_vars_internal (struct gomp_device_descr *devicep,
size_t align = (size_t) 1 << (kind >> rshift);
tgt->list[i].key = k;
k->tgt = tgt;
if (field_tgt_clear != ~(size_t) 0)
if (field_tgt_clear != FIELD_TGT_EMPTY)
{
k->tgt_offset = k->host_start - field_tgt_base
+ field_tgt_offset;
if (i == field_tgt_clear)
field_tgt_clear = ~(size_t) 0;
field_tgt_clear = FIELD_TGT_EMPTY;
}
else
{