fix the handling of gibbon runtime args and usage help

gibbon-rts/rts-c/gibbon_rts.c

@@ -1796,13 +1796,20 @@ void gib_show_usage(char** argv)
     printf("\n");
     printf("This binary was generated by the Gibbon compiler.\n");
     printf("\n");
-    printf("Usage: %s [OPTS] [size] [iters]\n", argv[0]);
+    printf("Usage: %s [OPTIONS...]\n", argv[0]);
 
     printf("\n");
     printf("Options:\n");
-    printf(" --buffer-size <bytes>      Set the buffer size (default %" PRId64 ").\n", gib_global_biginf_init_chunk_size);
-    printf(" --bench-input <path>       Set the input file read for benchmarking. Applies only\n");
-    printf("                            IF the program was *compiled* with --bench-fun. \n");
+    printf(" --biginf-buffer-size <bytes>   Set the buffer size (default %" PRId64 ").\n", gib_global_biginf_init_chunk_size);
+    printf(" --inf-buffer-size <bytes>      Set the buffer size (default %" PRId64 ").\n", gib_global_inf_init_chunk_size);
+    printf(" --bench-input <path>           Set the input file read for benchmarking. Applies only\n");
+    printf("                                If the program was *compiled* with --bench-fun. \n");
+    printf("\n");
+    printf(" --array-input <path>           Set the file from which to read the array input.\n");
+    printf(" --array-input-length <int>     Set the size of the array input file.\n");
+    printf(" --iterate <int>                Set the number of timing iterations to perform (default 1).\n");
+    // TODO: Rectify the definition of size-param
+    printf(" --size-param <int>             A parameter for size available as a language primitive which allows user to specify the size at runtime (default 1).\n");
     return;
 }
 
@@ -1864,6 +1871,14 @@ int dbgprintf(const char *format, ...)
     return code;
 }
 
+void check_args(int i, int argc, char **argv, char *parameter){
+    if (i+1 >= argc) {
+        fprintf(stderr, "Not enough arguments after %s, expected <int>.\n", parameter);
+        gib_show_usage(argv);
+        exit(1);
+    }
+}
+
 
 /* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  * RTS initialization and clean up
@@ -1914,7 +1929,7 @@ int gib_init(int argc, char **argv)
     }
 #endif
 
-    int got_numargs = 0; // How many numeric arguments have we got.
+    int got_numargs = argc; // How many numeric arguments have we got.
 
     int i;
     for (i = 1; i < argc; ++i)
@@ -1923,57 +1938,54 @@ int gib_init(int argc, char **argv)
             gib_show_usage(argv);
             exit(0);
         }
-        else if (strcmp(argv[i], "--biginf-buffer-size") == 0 && i < argc - 1)
-        {
+        else if (strcmp(argv[i], "--biginf-buffer-size") == 0 && i < argc - 1) {
+            check_args(i, argc, argv, "--biginf-buffer-size");
             gib_global_biginf_init_chunk_size = atoll(argv[i + 1]);
             i++;
         }
-        else if (strcmp(argv[i], "--inf-buffer-size") == 0 && i < argc - 1)
-        {
+        else if (strcmp(argv[i], "--inf-buffer-size") == 0 && i < argc - 1) {
+            check_args(i, argc, argv, "--inf-buffer-size");
             gib_global_inf_init_chunk_size = atoll(argv[i + 1]);
             i++;
         }
         else if ((strcmp(argv[i], "--bench-input") == 0)) {
-            if (i+1 >= argc) {
-                fprintf(stderr, "Not enough arguments after --bench-input, expected <file>.\n");
-                gib_show_usage(argv);
-                exit(1);
-            }
+            check_args(i, argc, argv, "--bench-input");
             gib_global_benchfile_param = argv[i+1];
             i++;
         }
         else if ((strcmp(argv[i], "--array-input") == 0)) {
-            if (i+1 >= argc) {
-                fprintf(stderr, "Not enough arguments after --array-input, expected <file>.\n");
-                gib_show_usage(argv);
-                exit(1);
-            }
+            check_args(i, argc, argv, "--array-input");
             gib_global_arrayfile_param = argv[i+1];
             i++;
         }
         else if (strcmp(argv[i], "--array-input-length") == 0 && i < argc - 1) {
+            check_args(i, argc, argv, "--array-input-length");
             gib_global_arrayfile_length_param = atoll(argv[i+1]);
             i++;
         }
         else if (strcmp(argv[i], "--bench-prog") == 0 && i < argc - 1) {
+            check_args(i, argc, argv, "--bench-prog");
             int len = strlen(argv[i+1]);
             gib_global_bench_prog_param = (char*) gib_alloc((len+1)*sizeof(char));
             strncpy(gib_global_bench_prog_param,argv[i+1],len);
             i++;
         }
+        else if ((strcmp(argv[i], "--iterate") == 0)) {
+            check_args(i, argc, argv, "--iterate");
+            gib_global_iters_param = atoll(argv[i+1]);
+            i++;
+        }
+        else if ((strcmp(argv[i], "--size-param") == 0)) {
+            check_args(i, argc, argv, "--size-param");
+            gib_global_size_param = atoll(argv[i+1]);
+            i++;
+        }
         // If present, we expect the two arguments to be <size> <iters>
-        else if (got_numargs >= 2) {
+        else {
             fprintf(stderr, "Extra arguments left over: ");
             for(; i < argc; i++) fprintf(stderr, "%s ", argv[i]);
             gib_show_usage(argv);
             exit(1);
-        } else {
-            if (got_numargs == 0) {
-                gib_global_size_param  = atoll(argv[i]);
-                got_numargs ++;
-            } else {
-                gib_global_iters_param = atoll(argv[i]);
-            }
         }
     }