[PATCH 1/5] core: Move class__has_flexible_array() from pahole to the core

[Arnaldo Carvalho de Melo <acme@kernel.org>]

From: Arnaldo Carvalho de Melo <acme@redhat.com>

We want to cache that info, look if there are embedded fields of structs
with flexible arrays, etc.

Cc: "Gustavo A. R. Silva" <gustavoars@kernel.org>
Cc: Willy Tarreau <w@1wt.eu>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 dwarves.c | 23 +++++++++++++++++++++++
 dwarves.h |  1 +
 pahole.c  | 23 -----------------------
 3 files changed, 24 insertions(+), 23 deletions(-)

diff --git a/dwarves.c b/dwarves.c
index 6e6a9e69a61d1e37..3d91e629277a329f 100644
--- a/dwarves.c
+++ b/dwarves.c
@@ -1575,6 +1575,29 @@ void lexblock__add_label(struct lexblock *block, struct label *label)
 	lexblock__add_tag(block, &label->ip.tag);
 }
 
+bool class__has_flexible_array(struct class *class, const struct cu *cu)
+{
+	struct class_member *member = type__last_member(&class->type);
+
+	if (member == NULL)
+		return false;
+
+	struct tag *type = cu__type(cu, member->tag.type);
+
+	if (type->tag != DW_TAG_array_type)
+		return false;
+
+	struct array_type *array = tag__array_type(type);
+
+	if (array->dimensions > 1)
+		return false;
+
+	if (array->nr_entries == NULL || array->nr_entries[0] == 0)
+		return true;
+
+	return false;
+}
+
 const struct class_member *class__find_bit_hole(const struct class *class,
 					    const struct class_member *trailer,
 						const uint16_t bit_hole_size)
diff --git a/dwarves.h b/dwarves.h
index 2bb0eed461d08d51..757fc05dd3363bf1 100644
--- a/dwarves.h
+++ b/dwarves.h
@@ -1454,6 +1454,7 @@ static inline int class__is_struct(const struct class *cls)
 	return tag__is_struct(&cls->type.namespace.tag);
 }
 
+bool class__has_flexible_array(struct class *class, const struct cu *cu);
 void class__find_holes(struct class *cls);
 int class__has_hole_ge(const struct class *cls, const uint16_t size);
 
diff --git a/pahole.c b/pahole.c
index 766835d93a1f3d1e..8bdfaf3e84c407d7 100644
--- a/pahole.c
+++ b/pahole.c
@@ -725,29 +725,6 @@ static int class__packable(struct class *class, struct cu *cu)
 	return 0;
 }
 
-static bool class__has_flexible_array(struct class *class, struct cu *cu)
-{
-	struct class_member *member = type__last_member(&class->type);
-
-	if (member == NULL)
-		return false;
-
-	struct tag *type = cu__type(cu, member->tag.type);
-
-	if (type->tag != DW_TAG_array_type)
-		return false;
-
-	struct array_type *array = tag__array_type(type);
-
-	if (array->dimensions > 1)
-		return false;
-
-	if (array->nr_entries == NULL || array->nr_entries[0] == 0)
-		return true;
-
-	return false;
-}
-
 static struct class *class__filter(struct class *class, struct cu *cu,
 				   uint32_t tag_id)
 {
-- 
2.46.2