X-Git-Url: https://git.libre-soc.org/?a=blobdiff_plain;f=src%2Fmesa%2Fshader%2Fgrammar%2Fgrammar.c;h=a9775961d3a6577654cc072c8f3e423847e578e6;hb=4af0d940a35536f096a9289470af0268a79402b3;hp=7f2ee42d21d7ba06ec26da8cbf955eff1822e8d5;hpb=a79d4e75c3f1da65a6f4d4d8d450ad96fa98767d;p=mesa.git

diff --git a/src/mesa/shader/grammar/grammar.c b/src/mesa/shader/grammar/grammar.c
index 7f2ee42d21d..a9775961d3a 100644
--- a/src/mesa/shader/grammar/grammar.c
+++ b/src/mesa/shader/grammar/grammar.c
@@ -260,6 +260,8 @@
     first).
 */
 
+#include <stdio.h>
+
 static void mem_free (void **);
 
 /*
@@ -2691,14 +2693,16 @@ fast_match (dict *di, const byte *text, int *index, rule *ru, int *_PP, bytepool
 
         if (status == mr_matched)
         {
-            if (sp->m_emits != NULL)
-                if (emit_push (sp->m_emits, _BP->_F + _P, text[ind - 1], save_ind, &ctx))
+            if (sp->m_emits != NULL) {
+                const byte ch = (ind <= 0) ? 0 : text[ind - 1];
+                if (emit_push (sp->m_emits, _BP->_F + _P, ch, save_ind, &ctx))
                 {
                     free_regbyte_ctx_stack (ctx, *rbc);
                     return mr_internal_error;
                 }
 
-            _P = _P2;
+           }
+           _P = _P2;
         }
 
         /* if the rule operator is a logical or, we pick up the first matching specifier */
@@ -2797,10 +2801,16 @@ static void grammar_load_state_destroy (grammar_load_state **gr)
     }
 }
 
+
+static void error_msg(int line, const char *msg)
+{
+   fprintf(stderr, "Error in grammar_load_from_text() at line %d: %s\n", line, msg);
+}
+
+
 /*
     the API
 */
-
 grammar grammar_load_from_text (const byte *text)
 {
     grammar_load_state *g = NULL;
@@ -2809,13 +2819,16 @@ grammar grammar_load_from_text (const byte *text)
     clear_last_error ();
 
     grammar_load_state_create (&g);
-    if (g == NULL)
+    if (g == NULL) {
+        error_msg(__LINE__, "");
         return 0;
+    }
 
     dict_create (&g->di);
     if (g->di == NULL)
     {
         grammar_load_state_destroy (&g);
+        error_msg(__LINE__, "");
         return 0;
     }
 
@@ -2829,6 +2842,7 @@ grammar grammar_load_from_text (const byte *text)
     if (get_identifier (&text, &g->syntax_symbol))
     {
         grammar_load_state_destroy (&g);
+        error_msg(__LINE__, "");
         return 0;
     }
     eat_spaces (&text);
@@ -2848,6 +2862,7 @@ grammar grammar_load_from_text (const byte *text)
         if (get_identifier (&text, &symbol))
         {
             grammar_load_state_destroy (&g);
+            error_msg(__LINE__, "");
             return 0;
         }
         eat_spaces (&text);
@@ -2862,6 +2877,7 @@ grammar grammar_load_from_text (const byte *text)
             if (get_emtcode (&text, &ma))
             {
                 grammar_load_state_destroy (&g);
+                error_msg(__LINE__, "");
                 return 0;
             }
 
@@ -2877,6 +2893,7 @@ grammar grammar_load_from_text (const byte *text)
             if (get_regbyte (&text, &ma))
             {
                 grammar_load_state_destroy (&g);
+                error_msg(__LINE__, "");
                 return 0;
             }
 
@@ -2892,6 +2909,7 @@ grammar grammar_load_from_text (const byte *text)
             if (get_errtext (&text, &ma))
             {
                 grammar_load_state_destroy (&g);
+                error_msg(__LINE__, "");
                 return 0;
             }
 
@@ -2905,12 +2923,14 @@ grammar grammar_load_from_text (const byte *text)
             if (g->di->m_string != NULL)
             {
                 grammar_load_state_destroy (&g);
+                error_msg(__LINE__, "");
                 return 0;
             }
 
             if (get_identifier (&text, &g->string_symbol))
             {
                 grammar_load_state_destroy (&g);
+                error_msg(__LINE__, "");
                 return 0;
             }
 
@@ -2927,6 +2947,7 @@ grammar grammar_load_from_text (const byte *text)
             if (get_rule (&text, &ru, g->maps, g->mapb))
             {
                 grammar_load_state_destroy (&g);
+                error_msg(__LINE__, "");
                 return 0;
             }
 
@@ -2940,6 +2961,7 @@ grammar grammar_load_from_text (const byte *text)
             if (ma == NULL)
             {
                 grammar_load_state_destroy (&g);
+                error_msg(__LINE__, "");
                 return 0;
             }
 
@@ -2953,6 +2975,7 @@ grammar grammar_load_from_text (const byte *text)
         g->di->m_regbytes))
     {
         grammar_load_state_destroy (&g);
+        error_msg(__LINE__, "update_dependencies() failed");
         return 0;
     }