Add patch to pull nested anonymous structs out of structs and unions

Newer versionf of NVML have introduced anonymous structs inside of versious
top-level structs and unions, and godefs doesn't handle these unfortunately. To
compensate for this, we use a coccinelle file to restructure nvml.h and create
well-defined structs (with typedefs) instead of anonymous structs. These new
typedefs are named such that they can be easily referred to in user-code as
desired (e.g. to populate them and then cast the original union type to them).

Signed-off-by: Kevin Klues <[email protected]>

Author: klueska

Makefile

@@ -57,6 +57,7 @@ patch-nvml-h: $(PKG_BINDINGS_DIR)/nvml.h
 $(PKG_BINDINGS_DIR)/nvml.h: $(GEN_BINDINGS_DIR)/nvml.h | $(PKG_BINDINGS_DIR)
 	cp $(<) $(@)
 	$(SED) -i -E 's#(typedef\s+struct)\s+(nvml.*_st\*)\s+(nvml.*_t);#\1\n{\n    struct \2 handle;\n} \3;#g' $(@)
+	spatch --in-place --very-quiet --sp-file $(GEN_BINDINGS_DIR)/anonymous_structs.cocci $(@) > /dev/null
 
 bindings: .create-bindings .strip-autogen-comment .strip-nvml-h-linenumber
 

gen/nvml/anonymous_structs.cocci

@@ -0,0 +1,100 @@
+@patch@
+type WRAPPER_TYPE;
+field list FIELDS;
+identifier V;
+expression E;
+fresh identifier ST = "nvmlGenerated_struct___";
+fresh identifier TEMP_VAR = "nvmlGenerated_variable___" ## V;
+@@
+
+++ struct ST {
+++    WRAPPER_TYPE TEMP_VAR;
+++    FIELDS
+++ };
++
+
+WRAPPER_TYPE
+{
+    ...
+(
+-    struct {
+-       FIELDS
+-   } V[E];
++   struct ST V[E];
+
+|
+
+-    struct {
+-       FIELDS
+-   } V;
++   struct ST V;
+)
+    ...
+};
+
+@capture@
+type WRAPPER_TYPE;
+identifier TEMP_VAR;
+identifier ST =~ "^nvmlGenerated_struct___";
+@@
+
+struct ST {
+  WRAPPER_TYPE TEMP_VAR;
+  ...
+};
+
+@script:python concat@
+WRAPPER_TYPE << capture.WRAPPER_TYPE;
+TEMP_VAR << capture.TEMP_VAR;
+ST << capture.ST;
+T;
+@@
+
+def removePrefix(string, prefix):
+    if string.startswith(prefix):
+        return string[len(prefix):]
+    return string
+
+def removeSuffix(string, suffix):
+    if string.endswith(suffix):
+        return string[:-len(suffix)]
+    return string
+
+WRAPPER_TYPE = removeSuffix(WRAPPER_TYPE, "_t")
+TEMP_VAR = removePrefix(TEMP_VAR, "nvmlGenerated_variable___")
+coccinelle.T = cocci.make_type(WRAPPER_TYPE + TEMP_VAR[0].upper() + TEMP_VAR[1:] + "_t")
+
+@add_typedef@
+identifier capture.ST;
+type concat.T;
+type WRAPPER_TYPE;
+identifier TEMP_VAR;
+@@
+
+- struct ST {
++ typedef struct {
+- WRAPPER_TYPE TEMP_VAR;
+  ...
+- };
++ } T;
+
+@update@
+identifier capture.ST;
+type concat.T;
+identifier V;
+expression E;
+type WRAPPER_TYPE;
+@@
+
+WRAPPER_TYPE
+{
+    ...
+(
+-   struct ST V[E];
++   T V[E];
+|
+-   struct ST V;
++   T V;
+)
+    ...
+};