Comments added

diff --git a/util/ceg/EM_parser/common/C_instr2.c b/util/ceg/EM_parser/common/C_instr2.c
index adf87f4..750c293 100644 (file)
--- a/util/ceg/EM_parser/common/C_instr2.c
+++ b/util/ceg/EM_parser/common/C_instr2.c
@@ -1,5 +1,29 @@
 #include "decl.h"
 
+/* This file contains two arrays with information concerning the C_INSTR tokens:
+ *     t_C_info C_info[];      - Describes the arguments of EM-instructions
+ *     struct ? EM_instr[];    - Contains per entry:
+ *                                     1) The name of the C_INSTR
+ *                                     2) The type of its argument, an index in
+ *                                        C_info[].
+ *                                     3) The segment for which code/data must
+ *                                        be generated.
+ *                               The array is sorted on the C_INSTR-name.
+ *
+ * Furthermore there are two routines present in this file :
+ *     set_C_instr_info( instr)        - It looks 'instr' up in EM_instr[] and
+ *             char *instr;            - sets the global variables
+ *                                     - 'C_instr_info' and 'segment'.
+ *
+ *     arg_type( arg)          - 'arg' must be a string starting with a '$' 
+ *             char *arg;      - and a number. arg_type() will return the
+ *                             - type of the 'number'th argment of the current
+ *                             - C_INSTR.
+ *                             - For example, if the EM_table contains:
+ *                                 C_loc ==> "pushl $1".
+ *                               then arg_type( "$1") will return ARITH.
+ */
+
 
 t_C_info C_info[] = {
        /* NO_ARGS      */   { "()\n{\n",