py: Add tentative scheme for error messages configuration.

py/mpconfig.h

@@ -94,6 +94,17 @@ typedef long long mp_longint_impl_t;
 #define MICROPY_ENABLE_DOC_STRING (0)
 #endif
 
+// Exception messages are short static strings (TODO)
+#define MICROPY_ERROR_REPORTING_TERSE    (1)
+// Exception messages provide basic error details
+#define MICROPY_ERROR_REPORTING_NORMAL   (2)
+// Exception messages provide full info, e.g. object names
+#define MICROPY_ERROR_REPORTING_DETAILED (3)
+
+#ifndef MICROPY_ERROR_REPORTING
+#define MICROPY_ERROR_REPORTING (MICROPY_ERROR_REPORTING_NORMAL)
+#endif
+
 // Float and complex implementation
 #define MICROPY_FLOAT_IMPL_NONE (0)
 #define MICROPY_FLOAT_IMPL_FLOAT (1)

py/objfun.c

@@ -152,8 +152,18 @@ STATIC void dump_args(const mp_obj_t *a, int sz) {
 #endif
 
 STATIC NORETURN void fun_pos_args_mismatch(mp_obj_fun_bc_t *f, uint expected, uint given) {
+#if MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE
+    // Generic message, to be reused for other argument issues
+    nlr_raise(mp_obj_new_exception_msg(&mp_type_TypeError,
+        "argument num/types mismatch"));
+#elif MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_NORMAL
     nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError,
         "function takes %d positional arguments but %d were given", expected, given));
+#elif MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_DETAILED
+    nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError,
+        "%s() takes %d positional arguments but %d were given",
+        mp_obj_fun_get_name(f), expected, given));
+#endif
 }
 
 // If it's possible to call a function without allocating new argument array,

unix/mpconfigport.h

@@ -16,6 +16,9 @@
 #define MICROPY_USE_COMPUTED_GOTO   (1)
 #define MICROPY_MOD_SYS_STDFILES    (1)
 #define MICROPY_ENABLE_MOD_CMATH    (1)
+// Define to MICROPY_ERROR_REPORTING_DETAILED to get function, etc.
+// names in exception messages (may require more RAM).
+#define MICROPY_ERROR_REPORTING     (MICROPY_ERROR_REPORTING_DETAILED)
 
 extern const struct _mp_obj_module_t mp_module_time;
 extern const struct _mp_obj_module_t mp_module_socket;