[PATCH v2 1/8] Add basic Coccinelle transforms.

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Coccinelle (http://coccinelle.lip6.fr/) is a program which performs
mechanical transformations on C programs using semantic patches.  These
semantic patches can be used to implement automatic refactoring and
maintenance tasks.

Add a set of basic semantic patches to convert common patterns related
to the struct object_id transformation, as well as a README.

Signed-off-by: brian m. carlson <sandals@xxxxxxxxxxxxxxxxxxxx>
---
 contrib/examples/coccinelle/README          |  2 +
 contrib/examples/coccinelle/object_id.cocci | 83 +++++++++++++++++++++++++++++
 2 files changed, 85 insertions(+)
 create mode 100644 contrib/examples/coccinelle/README
 create mode 100644 contrib/examples/coccinelle/object_id.cocci

diff --git a/contrib/examples/coccinelle/README b/contrib/examples/coccinelle/README
new file mode 100644
index 00000000..9c2f8879
--- /dev/null
+++ b/contrib/examples/coccinelle/README
@@ -0,0 +1,2 @@
+This directory provides examples of Coccinelle (http://coccinelle.lip6.fr/)
+semantic patches that might be useful to developers.
diff --git a/contrib/examples/coccinelle/object_id.cocci b/contrib/examples/coccinelle/object_id.cocci
new file mode 100644
index 00000000..0f068252
--- /dev/null
+++ b/contrib/examples/coccinelle/object_id.cocci
@@ -0,0 +1,83 @@
+@@
+expression E1;
+@@
+- is_null_sha1(E1.hash)
++ is_null_oid(&E1)
+
+@@
+expression E1;
+@@
+- is_null_sha1(E1->hash)
++ is_null_oid(E1)
+
+@@
+expression E1;
+@@
+- sha1_to_hex(E1.hash)
++ oid_to_hex(&E1)
+
+@@
+expression E1;
+@@
+- sha1_to_hex(E1->hash)
++ oid_to_hex(E1)
+
+@@
+expression E1;
+@@
+- hashclr(E1.hash)
++ oidclr(&E1)
+
+@@
+expression E1;
+@@
+- hashclr(E1->hash)
++ oidclr(E1)
+
+@@
+expression E1, E2;
+@@
+- hashcmp(E1.hash, E2.hash)
++ oidcmp(&E1, &E2)
+
+@@
+expression E1, E2;
+@@
+- hashcmp(E1->hash, E2->hash)
++ oidcmp(E1, E2)
+
+@@
+expression E1, E2;
+@@
+- hashcmp(E1->hash, E2.hash)
++ oidcmp(E1, &E2)
+
+@@
+expression E1, E2;
+@@
+- hashcmp(E1.hash, E2->hash)
++ oidcmp(&E1, E2)
+
+@@
+expression E1, E2;
+@@
+- hashcpy(E1.hash, E2.hash)
++ oidcpy(&E1, &E2)
+
+@@
+expression E1, E2;
+@@
+- hashcpy(E1->hash, E2->hash)
++ oidcpy(E1, E2)
+
+@@
+expression E1, E2;
+@@
+- hashcpy(E1->hash, E2.hash)
++ oidcpy(E1, &E2)
+
+@@
+expression E1, E2;
+@@
+- hashcpy(E1.hash, E2->hash)
++ oidcpy(&E1, E2)
--
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