Add macros to make codelets just declare their access and let the macro definition do what should be

Here is written down the set of generic macro I'm thinking of to make codelet declare their memory access (see !16 (closed))

For now they are very trivial, and produce exactly the same effect as with the current master. But then one can easily add the morse_desc_iscached() test, add statistics, etc. without having to change the codelets again.

I've put it in control/descriptor.h for simplicity, but we can of course push to runtime-specific code (which file?)

control/descriptor.h

@@ -196,6 +196,32 @@ inline static int morse_desc_islocal( const MORSE_desc_t *A, int m, int n )
 #endif /* defined(CHAMELEON_USE_MPI) */
 }
 
+/*******************************************************************************
+ * Declare data accesses of codelets using these macros, for instance:
+ * MORSE_BEGIN_ACCESS_DECLARATION
+ * MORSE_ACCESS_R(A, Am, An)
+ * MORSE_ACCESS_R(B, Bm, Bn)
+ * MORSE_ACCESS_RW(C, Cm, Cn)
+ * MORSE_END_ACCESS_DECLARATION
+ */
+#define MORSE_BEGIN_ACCESS_DECLARATION { \
+    unsigned __morse_need_submit = 0;
+
+#define MORSE_ACCESS_R(A, Am, An) \
+    if (morse_desc_islocal(A, Am, An)) __morse_need_submit = 1;
+
+#define MORSE_ACCESS_W(A, Am, An) \
+    if (morse_desc_islocal(A, Am, An)) __morse_need_submit = 1;
+
+#define MORSE_ACCESS_RW(A, Am, An) \
+    if (morse_desc_islocal(A, Am, An)) __morse_need_submit = 1;
+
+#define MORSE_RANK_CHANGED __morse_need_submit = 1;
+
+#define MORSE_END_ACCESS_DECLARATION \
+    if (!__morse_need_submit) return; \
+}
+
 #ifdef __cplusplus
 }
 #endif