[D] Correctly annotate function pointers with C linkage.

Minor cleanups as well.

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk@12899 626c5289-ae23-0410-ae9c-e8d60b6d4f22

CHANGES.current

@@ -5,6 +5,9 @@ See the RELEASENOTES file for a summary of changes in each release.
 Version 2.0.5 (in progress)
 ===========================
 
+2012-01-23: klickverbot
+            [D] Correctly annotate function pointers with C linkage.
+
 2012-01-20: wsfulton
             [Python] Add Python stepped slicing support to the STL wrappers (std::vector, std::list).
             Assigning to a slice, reading a slice and deleting a slice with steps now work.
@@ -87,7 +90,7 @@ Version 2.0.5 (in progress)
 	    Bug fix: Handle methods renamed or ignored in the base class correctly in the derived classes
 	    (they could be sometimes mysteriously not renamed or ignored there before).
 
-2011-12-03: klickvebrot
+2011-12-03: klickverbot
             [D] Fix exception glue code for newer DMD 2 versions.
             [D] Do not default to 32 bit glue code for DMD anymore.
             [D] Use stdc.config.c_long/c_ulong to represent C long types.

Examples/test-suite/d/d_nativepointers_runme.1.d

@@ -6,6 +6,8 @@ import d_nativepointers.SWIGTYPE_p_OpaqueClass;
 import d_nativepointers.SWIGTYPE_p_p_SomeClass;
 import d_nativepointers.SWIGTYPE_p_p_f_p_p_int_p_SomeClass__void;
 
+extern(C) alias void function(int**, char***) GType;
+
 void main() {
   check!(a, int*);
   check!(b, float**);
@@ -13,7 +15,7 @@ void main() {
   check!(d, SomeClass);
   check!(e, SWIGTYPE_p_p_SomeClass);
   check!(f, SWIGTYPE_p_OpaqueClass);
-  check!(g, void function(int**, char***));
+  check!(g, GType);
   check!(h, SWIGTYPE_p_p_f_p_p_int_p_SomeClass__void);
 
   {

Examples/test-suite/d/d_nativepointers_runme.2.d

@@ -6,6 +6,8 @@ import d_nativepointers.SWIGTYPE_p_OpaqueClass;
 import d_nativepointers.SWIGTYPE_p_p_SomeClass;
 import d_nativepointers.SWIGTYPE_p_p_f_p_p_int_p_SomeClass__void;
 
+extern(C) alias void function(int**, char***) GType;
+
 void main() {
   check!(a, int*);
   check!(b, float**);
@@ -13,7 +15,7 @@ void main() {
   check!(d, SomeClass);
   check!(e, SWIGTYPE_p_p_SomeClass);
   check!(f, SWIGTYPE_p_OpaqueClass);
-  check!(g, void function(int**, char***));
+  check!(g, GType);
   check!(h, SWIGTYPE_p_p_f_p_p_int_p_SomeClass__void);
 
   {

Lib/d/dhead.swg

@@ -3,15 +3,23 @@
  *
  * Support code for exceptions if the SWIG_D_NO_EXCEPTION_HELPER is not defined
  * Support code for strings if the SWIG_D_NO_STRING_HELPER is not defined
- * ----------------------------------------------------------------------------- */
+ *
+ * Support code for function pointers. ----------------------------------------------------------------------------- */
 
 %insert(runtime) %{
 #include <stdlib.h>
 #include <string.h>
 #include <stdio.h>
+
+/* Contract support. */
+#define SWIG_contract_assert(nullreturn, expr, msg) if (!(expr)) {SWIG_DSetPendingException(SWIG_DException, msg); return nullreturn; } else
 %}
 
 
+/*
+ * Exception support code.
+ */
+
 #if !defined(SWIG_D_NO_EXCEPTION_HELPER)
 %insert(runtime) %{
 // Support for throwing D exceptions from C/C++.
@@ -250,6 +258,11 @@ alias void function(const char* message) SwigExceptionCallback;
 // Callback registering function in wrapperloader.swg.
 #endif // SWIG_D_NO_EXCEPTION_HELPER
 
+
+/*
+ * String support code.
+ */
+
 #if !defined(SWIG_D_NO_STRING_HELPER)
 %insert(runtime) %{
 // Callback for returning strings to D without leaking memory.
@@ -304,7 +317,28 @@ alias const(char)* function(const(char*) cString) SwigStringCallback;
 // Callback registering function in wrapperloader.swg.
 #endif // SWIG_D_NO_STRING_HELPER
 
-%insert(runtime) %{
-/* Contract support. */
-#define SWIG_contract_assert(nullreturn, expr, msg) if (!(expr)) {SWIG_DSetPendingException(SWIG_DException, msg); return nullreturn; } else
+
+/*
+ * Function pointer support code.
+ */
+#if (SWIG_D_VERSION == 1)
+%pragma(d) imdmodulecode = %{
+template SwigExternC(T) {
+  static if (is(typeof(*(T.init)) R == return)) {
+    static if (is(typeof(*(T.init)) P == function)) {
+      alias extern(C) R function(P) SwigExternC;
+    }
+  }
+}
 %}
+#else
+%pragma(d) imdmodulecode = %{
+template SwigExternC(T) if (is(typeof(*(T.init)) P == function)) {
+  static if (is(typeof(*(T.init)) R == return)) {
+    static if (is(typeof(*(T.init)) P == function)) {
+      alias extern(C) R function(P) SwigExternC;
+    }
+  }
+}
+%}
+#endif

Source/Modules/d.cxx

@@ -3877,7 +3877,8 @@ private:
 	}
       }
 
-      dtype = NewStringf("%s function(%s)", return_dtype, param_list);
+      dtype = NewStringf("%s.SwigExternC!(%s function(%s))", im_dmodule_fq_name,
+        return_dtype, param_list);
       Delete(param_list);
       Delete(param_dtypes);
       Delete(return_dtype);