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/*
* Copyright 2010 INRIA Saclay
* Copyright 2013 Ecole Normale Superieure
*
* Use of this software is governed by the MIT license
*
* Written by Sven Verdoolaege, INRIA Saclay - Ile-de-France,
* Parc Club Orsay Universite, ZAC des vignes, 4 rue Jacques Monod,
* 91893 Orsay, France
* and Ecole Normale Superieure, 45 rue d'Ulm, 75230 Paris, France
*/
#include <isl_hash_private.h>
#include <isl_union_macro.h>
/* A union of expressions defined over different domain spaces.
* "space" describes the parameters.
* The entries of "table" are keyed on the domain space of the entry.
*/
struct UNION {
int ref;
#ifdef HAS_TYPE
enum isl_fold type;
#endif
isl_space *space;
struct isl_hash_table table;
};
/* Return the number of base expressions in "u".
*/
int FN(FN(UNION,n),BASE)(__isl_keep UNION *u)
{
return u ? u->table.n : 0;
}
S(UNION,foreach_data)
{
isl_stat (*fn)(__isl_take PART *part, void *user);
void *user;
};
static isl_stat FN(UNION,call_on_copy)(void **entry, void *user)
{
PART *part = *entry;
S(UNION,foreach_data) *data = (S(UNION,foreach_data) *)user;
part = FN(PART,copy)(part);
if (!part)
return isl_stat_error;
return data->fn(part, data->user);
}
isl_stat FN(FN(UNION,foreach),BASE)(__isl_keep UNION *u,
isl_stat (*fn)(__isl_take PART *part, void *user), void *user)
{
S(UNION,foreach_data) data = { fn, user };
if (!u)
return isl_stat_error;
return isl_hash_table_foreach(u->space->ctx, &u->table,
&FN(UNION,call_on_copy), &data);
}
/* Is the domain space of "entry" equal to the domain of "space"?
*/
static int FN(UNION,has_same_domain_space)(const void *entry, const void *val)
{
PART *part = (PART *)entry;
isl_space *space = (isl_space *) val;
if (isl_space_is_set(space))
return isl_space_is_set(part->dim);
return isl_space_tuple_is_equal(part->dim, isl_dim_in,
space, isl_dim_in);
}
/* Return the entry, if any, in "u" that lives in "space".
* If "reserve" is set, then an entry is created if it does not exist yet.
* Return NULL on error and isl_hash_table_entry_none if no entry was found.
* Note that when "reserve" is set, the function will never return
* isl_hash_table_entry_none.
*
* First look for the entry (if any) with the same domain space.
* If it exists, then check if the range space also matches.
*/
static struct isl_hash_table_entry *FN(UNION,find_part_entry)(
__isl_keep UNION *u, __isl_keep isl_space *space, int reserve)
{
isl_ctx *ctx;
uint32_t hash;
struct isl_hash_table_entry *entry;
isl_bool equal;
PART *part;
if (!u || !space)
return NULL;
ctx = FN(UNION,get_ctx)(u);
hash = isl_space_get_domain_hash(space);
entry = isl_hash_table_find(ctx, &u->table, hash,
&FN(UNION,has_same_domain_space), space, reserve);
if (!entry)
return reserve ? NULL : isl_hash_table_entry_none;
if (reserve && !entry->data)
return entry;
part = entry->data;
equal = isl_space_tuple_is_equal(part->dim, isl_dim_out,
space, isl_dim_out);
if (equal < 0)
return NULL;
if (equal)
return entry;
if (!reserve)
return isl_hash_table_entry_none;
isl_die(FN(UNION,get_ctx)(u), isl_error_invalid,
"union expression can only contain a single "
"expression over a given domain", return NULL);
}
/* Remove "part_entry" from the hash table of "u".
*/
static __isl_give UNION *FN(UNION,remove_part_entry)(__isl_take UNION *u,
struct isl_hash_table_entry *part_entry)
{
isl_ctx *ctx;
if (!u || !part_entry)
return FN(UNION,free)(u);
ctx = FN(UNION,get_ctx)(u);
isl_hash_table_remove(ctx, &u->table, part_entry);
FN(PART,free)(part_entry->data);
return u;
}
/* Check that the domain of "part" is disjoint from the domain of the entries
* in "u" that are defined on the same domain space, but have a different
* target space.
* Since a UNION with a single entry per domain space is not allowed
* to contain two entries with the same domain space, there cannot be
* any such other entry.
*/
static isl_stat FN(UNION,check_disjoint_domain_other)(__isl_keep UNION *u,
__isl_keep PART *part)
{
return isl_stat_ok;
}
/* Check that the domain of "part1" is disjoint from the domain of "part2".
* This check is performed before "part2" is added to a UNION to ensure
* that the UNION expression remains a function.
* Since a UNION with a single entry per domain space is not allowed
* to contain two entries with the same domain space, fail unconditionally.
*/
static isl_stat FN(UNION,check_disjoint_domain)(__isl_keep PART *part1,
__isl_keep PART *part2)
{
isl_die(FN(PART,get_ctx)(part1), isl_error_invalid,
"additional part should live on separate space",
return isl_stat_error);
}
/* Call "fn" on each part entry of "u".
*/
static isl_stat FN(UNION,foreach_inplace)(__isl_keep UNION *u,
isl_stat (*fn)(void **part, void *user), void *user)
{
isl_ctx *ctx;
if (!u)
return isl_stat_error;
ctx = FN(UNION,get_ctx)(u);
return isl_hash_table_foreach(ctx, &u->table, fn, user);
}
/* Does "u" have a single reference?
* That is, can we change "u" inplace?
*/
static isl_bool FN(UNION,has_single_reference)(__isl_keep UNION *u)
{
if (!u)
return isl_bool_error;
return u->ref == 1;
}
static isl_stat FN(UNION,free_u_entry)(void **entry, void *user)
{
PART *part = *entry;
FN(PART,free)(part);
return isl_stat_ok;
}
#include <isl_union_templ.c>
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