[PATCH 2/5, OpenACC] Support Fortran optional arguments in the firstprivate clause
Kwok Cheung Yeung
kcy@codesourcery.com
Mon Jul 29 20:56:00 GMT 2019
On 12/07/2019 12:41 pm, Jakub Jelinek wrote:
>> +/* Return true if DECL is a Fortran optional argument. */
>> +
>> +bool
>> +omp_is_optional_argument (tree decl)
>> +{
>> + /* A passed-by-reference Fortran optional argument is similar to
>> + a normal argument, but since it can be null the type is a
>> + POINTER_TYPE rather than a REFERENCE_TYPE. */
>> + return lang_GNU_Fortran ()
>> + && TREE_CODE (decl) == PARM_DECL
>> + && DECL_BY_REFERENCE (decl)
>> + && TREE_CODE (TREE_TYPE (decl)) == POINTER_TYPE;
>> +}
>
> This should be done through a langhook.
> Are really all PARM_DECLs wtih DECL_BY_REFERENCE and pointer type optional
> arguments? I mean, POINTER_TYPE is used for a lot of cases.
>
I have now added a language hook for omp_is_optional_argument, implemented only
for Fortran. In the Fortran FE, I have introduced a language-specific decl flag
that is set to true during the construction of the PARM_DECLs for a function if
the symbol for the parameter has attr.optional set. The implementation of
omp_is_optional_argument checks this flag - this way, there should be no false
positives.
This implementation of omp_is_optional_argument returns true for both
by-reference and by-value optional arguments, so an extra check of the type is
needed to differentiate between the two. I have also made by-reference optional
arguments return true for gfc_omp_privatize_by_reference (since they should
behave like regular arguments if present), which simplifies the code a little.
> if (omp_is_reference (new_var)
> && TREE_CODE (TREE_TYPE (new_var)) != POINTER_TYPE)
As is, this code in lower_omp_target will always reject optional arguments, so
it must be changed. This was introduced in commit r261025 (SVN trunk) as a fix
for PR 85879, but it also breaks support for arrays in firstprivate, which was
probably an unintended side-effect. I have found that allowing POINTER_TYPEs
that are also DECL_BY_REFERENCE through in this condition allows both optional
arguments and arrays to work without regressing the tests in r261025.
Okay for trunk?
Kwok
gcc/fortran/
* f95-lang.c (LANG_HOOKS_OMP_IS_OPTIONAL_ARGUMENT): Define to
gfc_omp_is_optional_argument.
* trans-decl.c (create_function_arglist): Set
GFC_DECL_OPTIONAL_ARGUMENT in the generated decl if the parameter is
optional.
* trans-openmp.c (gfc_omp_is_optional_argument): New.
(gfc_omp_privatize_by_reference): Return true if the decl is an
optional pass-by-reference argument.
* trans.h (gfc_omp_is_optional_argument): New declaration.
(lang_decl): Add new optional_arg field.
(GFC_DECL_OPTIONAL_ARGUMENT): New macro.
gcc/
* langhooks-def.h (LANG_HOOKS_OMP_IS_OPTIONAL_ARGUMENT): Default to
false.
(LANG_HOOKS_DECLS): Add LANG_HOOKS_OMP_IS_OPTIONAL_ARGUMENT.
* langhooks.h (omp_is_optional_argument): New hook.
* omp-general.c (omp_is_optional_argument): New.
* omp-general.h (omp_is_optional_argument): New declaration.
* omp-low.c (lower_omp_target): Create temporary for received value
and take the address for new_var if the original variable was a
DECL_BY_REFERENCE. Use size of referenced object when a
pass-by-reference optional argument used as argument to firstprivate.
---
gcc/fortran/f95-lang.c | 2 ++
gcc/fortran/trans-decl.c | 5 +++++
gcc/fortran/trans-openmp.c | 13 +++++++++++++
gcc/fortran/trans.h | 4 ++++
gcc/langhooks-def.h | 2 ++
gcc/langhooks.h | 3 +++
gcc/omp-general.c | 8 ++++++++
gcc/omp-general.h | 1 +
gcc/omp-low.c | 7 +++++--
9 files changed, 43 insertions(+), 2 deletions(-)
diff --git a/gcc/fortran/f95-lang.c b/gcc/fortran/f95-lang.c
index 6b9f490..2467cd9 100644
--- a/gcc/fortran/f95-lang.c
+++ b/gcc/fortran/f95-lang.c
@@ -113,6 +113,7 @@ static const struct attribute_spec gfc_attribute_table[] =
#undef LANG_HOOKS_TYPE_FOR_MODE
#undef LANG_HOOKS_TYPE_FOR_SIZE
#undef LANG_HOOKS_INIT_TS
+#undef LANG_HOOKS_OMP_IS_OPTIONAL_ARGUMENT
#undef LANG_HOOKS_OMP_PRIVATIZE_BY_REFERENCE
#undef LANG_HOOKS_OMP_PREDETERMINED_SHARING
#undef LANG_HOOKS_OMP_REPORT_DECL
@@ -145,6 +146,7 @@ static const struct attribute_spec gfc_attribute_table[] =
#define LANG_HOOKS_TYPE_FOR_MODE gfc_type_for_mode
#define LANG_HOOKS_TYPE_FOR_SIZE gfc_type_for_size
#define LANG_HOOKS_INIT_TS gfc_init_ts
+#define LANG_HOOKS_OMP_IS_OPTIONAL_ARGUMENT gfc_omp_is_optional_argument
#define LANG_HOOKS_OMP_PRIVATIZE_BY_REFERENCE gfc_omp_privatize_by_reference
#define LANG_HOOKS_OMP_PREDETERMINED_SHARING gfc_omp_predetermined_sharing
#define LANG_HOOKS_OMP_REPORT_DECL gfc_omp_report_decl
diff --git a/gcc/fortran/trans-decl.c b/gcc/fortran/trans-decl.c
index 64ce4bb..14f4d21 100644
--- a/gcc/fortran/trans-decl.c
+++ b/gcc/fortran/trans-decl.c
@@ -2632,6 +2632,11 @@ create_function_arglist (gfc_symbol * sym)
&& (!f->sym->attr.proc_pointer
&& f->sym->attr.flavor != FL_PROCEDURE))
DECL_BY_REFERENCE (parm) = 1;
+ if (f->sym->attr.optional)
+ {
+ gfc_allocate_lang_decl (parm);
+ GFC_DECL_OPTIONAL_ARGUMENT (parm) = 1;
+ }
gfc_finish_decl (parm);
gfc_finish_decl_attrs (parm, &f->sym->attr);
diff --git a/gcc/fortran/trans-openmp.c b/gcc/fortran/trans-openmp.c
index 8eae7bc..a117bcc 100644
--- a/gcc/fortran/trans-openmp.c
+++ b/gcc/fortran/trans-openmp.c
@@ -47,6 +47,15 @@ along with GCC; see the file COPYING3. If not see
int ompws_flags;
+/* True if OpenMP should treat this DECL as an optional argument. */
+
+bool
+gfc_omp_is_optional_argument (const_tree decl)
+{
+ return DECL_LANG_SPECIFIC (decl)
+ && GFC_DECL_OPTIONAL_ARGUMENT (decl);
+}
+
/* True if OpenMP should privatize what this DECL points to rather
than the DECL itself. */
@@ -59,6 +68,10 @@ gfc_omp_privatize_by_reference (const_tree decl)
&& (!DECL_ARTIFICIAL (decl) || TREE_CODE (decl) == PARM_DECL))
return true;
+ if (TREE_CODE (type) == POINTER_TYPE
+ && gfc_omp_is_optional_argument (decl))
+ return true;
+
if (TREE_CODE (type) == POINTER_TYPE)
{
/* Array POINTER/ALLOCATABLE have aggregate types, all user variables
diff --git a/gcc/fortran/trans.h b/gcc/fortran/trans.h
index 0305d33..7f9f6e8 100644
--- a/gcc/fortran/trans.h
+++ b/gcc/fortran/trans.h
@@ -776,6 +776,7 @@ struct array_descr_info;
bool gfc_get_array_descr_info (const_tree, struct array_descr_info *);
/* In trans-openmp.c */
+bool gfc_omp_is_optional_argument (const_tree);
bool gfc_omp_privatize_by_reference (const_tree);
enum omp_clause_default_kind gfc_omp_predetermined_sharing (tree);
tree gfc_omp_report_decl (tree);
@@ -989,6 +990,7 @@ struct GTY(()) lang_decl {
tree token, caf_offset;
unsigned int scalar_allocatable : 1;
unsigned int scalar_pointer : 1;
+ unsigned int optional_arg : 1;
};
@@ -1003,6 +1005,8 @@ struct GTY(()) lang_decl {
(DECL_LANG_SPECIFIC (node)->scalar_allocatable)
#define GFC_DECL_SCALAR_POINTER(node) \
(DECL_LANG_SPECIFIC (node)->scalar_pointer)
+#define GFC_DECL_OPTIONAL_ARGUMENT(node) \
+ (DECL_LANG_SPECIFIC (node)->optional_arg)
#define GFC_DECL_GET_SCALAR_ALLOCATABLE(node) \
(DECL_LANG_SPECIFIC (node) ? GFC_DECL_SCALAR_ALLOCATABLE (node) : 0)
#define GFC_DECL_GET_SCALAR_POINTER(node) \
diff --git a/gcc/langhooks-def.h b/gcc/langhooks-def.h
index a059841..55d5fe0 100644
--- a/gcc/langhooks-def.h
+++ b/gcc/langhooks-def.h
@@ -236,6 +236,7 @@ extern tree lhd_unit_size_without_reusable_padding (tree);
#define LANG_HOOKS_WARN_UNUSED_GLOBAL_DECL lhd_warn_unused_global_decl
#define LANG_HOOKS_POST_COMPILATION_PARSING_CLEANUPS NULL
#define LANG_HOOKS_DECL_OK_FOR_SIBCALL lhd_decl_ok_for_sibcall
+#define LANG_HOOKS_OMP_IS_OPTIONAL_ARGUMENT hook_bool_const_tree_false
#define LANG_HOOKS_OMP_PRIVATIZE_BY_REFERENCE hook_bool_const_tree_false
#define LANG_HOOKS_OMP_PREDETERMINED_SHARING lhd_omp_predetermined_sharing
#define LANG_HOOKS_OMP_REPORT_DECL lhd_pass_through_t
@@ -261,6 +262,7 @@ extern tree lhd_unit_size_without_reusable_padding (tree);
LANG_HOOKS_WARN_UNUSED_GLOBAL_DECL, \
LANG_HOOKS_POST_COMPILATION_PARSING_CLEANUPS, \
LANG_HOOKS_DECL_OK_FOR_SIBCALL, \
+ LANG_HOOKS_OMP_IS_OPTIONAL_ARGUMENT, \
LANG_HOOKS_OMP_PRIVATIZE_BY_REFERENCE, \
LANG_HOOKS_OMP_PREDETERMINED_SHARING, \
LANG_HOOKS_OMP_REPORT_DECL, \
diff --git a/gcc/langhooks.h b/gcc/langhooks.h
index a45579b..9d2714a 100644
--- a/gcc/langhooks.h
+++ b/gcc/langhooks.h
@@ -222,6 +222,9 @@ struct lang_hooks_for_decls
/* True if this decl may be called via a sibcall. */
bool (*ok_for_sibcall) (const_tree);
+ /* True if OpenMP should treat DECL as a Fortran optional argument. */
+ bool (*omp_is_optional_argument) (const_tree);
+
/* True if OpenMP should privatize what this DECL points to rather
than the DECL itself. */
bool (*omp_privatize_by_reference) (const_tree);
diff --git a/gcc/omp-general.c b/gcc/omp-general.c
index 8086f9a..1a09dc1 100644
--- a/gcc/omp-general.c
+++ b/gcc/omp-general.c
@@ -48,6 +48,14 @@ omp_find_clause (tree clauses, enum omp_clause_code kind)
return NULL_TREE;
}
+/* Return true if DECL is a Fortran optional argument. */
+
+bool
+omp_is_optional_argument (tree decl)
+{
+ return lang_hooks.decls.omp_is_optional_argument (decl);
+}
+
/* Return true if DECL is a reference type. */
bool
diff --git a/gcc/omp-general.h b/gcc/omp-general.h
index 80d42af..bbaa7b1 100644
--- a/gcc/omp-general.h
+++ b/gcc/omp-general.h
@@ -73,6 +73,7 @@ struct omp_for_data
#define OACC_FN_ATTRIB "oacc function"
extern tree omp_find_clause (tree clauses, enum omp_clause_code kind);
+extern bool omp_is_optional_argument (tree decl);
extern bool omp_is_reference (tree decl);
extern void omp_adjust_for_condition (location_t loc, enum tree_code *cond_code,
tree *n2, tree v, tree step);
diff --git a/gcc/omp-low.c b/gcc/omp-low.c
index a855c5b..1c7b43b 100644
--- a/gcc/omp-low.c
+++ b/gcc/omp-low.c
@@ -11173,7 +11173,8 @@ lower_omp_target (gimple_stmt_iterator *gsi_p,
omp_context *ctx)
{
gcc_assert (is_gimple_omp_oacc (ctx->stmt));
if (omp_is_reference (new_var)
- && TREE_CODE (TREE_TYPE (new_var)) != POINTER_TYPE)
+ && (TREE_CODE (TREE_TYPE (new_var)) != POINTER_TYPE
+ || DECL_BY_REFERENCE (var)))
{
/* Create a local object to hold the instance
value. */
@@ -11461,7 +11462,9 @@ lower_omp_target (gimple_stmt_iterator *gsi_p,
omp_context *ctx)
{
gcc_checking_assert (is_gimple_omp_oacc (ctx->stmt));
s = TREE_TYPE (ovar);
- if (TREE_CODE (s) == REFERENCE_TYPE)
+ if (TREE_CODE (s) == REFERENCE_TYPE
+ || (TREE_CODE (s) == POINTER_TYPE
+ && omp_is_optional_argument (ovar)))
s = TREE_TYPE (s);
s = TYPE_SIZE_UNIT (s);
}
--
2.8.1
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