2012-05-03 Sergio Durigan Junior <sergiodj@redhat.com>

	* stap-probe.c (stap_is_operator): Change declaration.
	(stap_get_opcode): Change return value.
	(stap_parse_argument_1): Update calls to `stap_get_opcode' and
	`stap_parse_argument_1'.

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 9d760c31634bd809d47592aca04c31c0e92634a8..bc33f41308b9560ecfdb85bb29dd73631329cc21 100644 (file)
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,10 @@
+2012-05-03  Sergio Durigan Junior  <sergiodj@redhat.com>
+
+       * stap-probe.c (stap_is_operator): Change declaration.
+       (stap_get_opcode): Change return value.
+       (stap_parse_argument_1): Update calls to `stap_get_opcode' and
+       `stap_parse_argument_1'.
+
 2012-05-03  Pedro Alves  <pedro@codesourcery.com>
 
        * infrun.c (displaced_step_fixup): Add "displaced:" prefix to

diff --git a/gdb/stap-probe.c b/gdb/stap-probe.c
index d1a38dae3ae01e0a3ad55f780ff4ba2ad7d4fea0..273ae0753ca2d0c1e4745fa04dd82a169f06b95b 100644 (file)
--- a/gdb/stap-probe.c
+++ b/gdb/stap-probe.c
@@ -154,7 +154,7 @@ static void stap_parse_argument_conditionally (struct stap_parse_info *p);
 
 /* Returns 1 if *S is an operator, zero otherwise.  */
 
-static int stap_is_operator (char op);
+static int stap_is_operator (const char *op);
 
 static void
 show_stapexpressiondebug (struct ui_file *file, int from_tty,
@@ -209,111 +209,107 @@ stap_get_operator_prec (enum exp_opcode op)
 /* Given S, read the operator in it and fills the OP pointer with its code.
    Return 1 on success, zero if the operator was not recognized.  */
 
-static int
-stap_get_opcode (const char **s, enum exp_opcode *op)
+static enum exp_opcode
+stap_get_opcode (const char **s)
 {
   const char c = **s;
-  int ret = 1;
+  enum exp_opcode op;
 
   *s += 1;
 
   switch (c)
     {
     case '*':
-      *op = BINOP_MUL;
+      op = BINOP_MUL;
       break;
 
     case '/':
-      *op = BINOP_DIV;
+      op = BINOP_DIV;
       break;
 
     case '%':
-      *op = BINOP_REM;
+      op = BINOP_REM;
     break;
 
     case '<':
-      *op = BINOP_LESS;
+      op = BINOP_LESS;
       if (**s == '<')
        {
          *s += 1;
-         *op = BINOP_LSH;
+         op = BINOP_LSH;
        }
       else if (**s == '=')
        {
          *s += 1;
-         *op = BINOP_LEQ;
+         op = BINOP_LEQ;
        }
       else if (**s == '>')
        {
          *s += 1;
-         *op = BINOP_NOTEQUAL;
+         op = BINOP_NOTEQUAL;
        }
     break;
 
     case '>':
-      *op = BINOP_GTR;
+      op = BINOP_GTR;
       if (**s == '>')
        {
          *s += 1;
-         *op = BINOP_RSH;
+         op = BINOP_RSH;
        }
       else if (**s == '=')
        {
          *s += 1;
-         *op = BINOP_GEQ;
+         op = BINOP_GEQ;
        }
     break;
 
     case '|':
-      *op = BINOP_BITWISE_IOR;
+      op = BINOP_BITWISE_IOR;
       if (**s == '|')
        {
          *s += 1;
-         *op = BINOP_LOGICAL_OR;
+         op = BINOP_LOGICAL_OR;
        }
     break;
 
     case '&':
-      *op = BINOP_BITWISE_AND;
+      op = BINOP_BITWISE_AND;
       if (**s == '&')
        {
          *s += 1;
-         *op = BINOP_LOGICAL_AND;
+         op = BINOP_LOGICAL_AND;
        }
     break;
 
     case '^':
-      *op = BINOP_BITWISE_XOR;
+      op = BINOP_BITWISE_XOR;
       break;
 
     case '!':
-      *op = UNOP_LOGICAL_NOT;
+      op = UNOP_LOGICAL_NOT;
       break;
 
     case '+':
-      *op = BINOP_ADD;
+      op = BINOP_ADD;
       break;
 
     case '-':
-      *op = BINOP_SUB;
+      op = BINOP_SUB;
       break;
 
     case '=':
-      if (**s != '=')
-       {
-         ret = 0;
-         break;
-       }
-      *op = BINOP_EQUAL;
+      gdb_assert (**s == '=');
+      op = BINOP_EQUAL;
       break;
 
     default:
-      /* We didn't find any operator.  */
-      *s -= 1;
-      return 0;
+      internal_error (__FILE__, __LINE__,
+                     _("Invalid opcode in expression `%s' for SystemTap"
+                       "probe"), *s);
     }
 
-  return ret;
+  return op;
 }
 
 /* Given the bitness of the argument, represented by B, return the
@@ -773,7 +769,7 @@ stap_parse_argument_1 (struct stap_parse_info *p, int has_lhs,
       enum exp_opcode opcode;
       enum stap_operand_prec cur_prec;
 
-      if (!stap_is_operator (*p->arg))
+      if (!stap_is_operator (p->arg))
        error (_("Invalid operator `%c' on expression `%s'."), *p->arg,
               p->saved_arg);
 
@@ -782,7 +778,7 @@ stap_parse_argument_1 (struct stap_parse_info *p, int has_lhs,
         operator.  If this operator's precedence is lower than PREC, we
         should return and not advance the expression buffer pointer.  */
       tmp_exp_buf = p->arg;
-      stap_get_opcode (&tmp_exp_buf, &opcode);
+      opcode = stap_get_opcode (&tmp_exp_buf);
 
       cur_prec = stap_get_operator_prec (opcode);
       if (cur_prec < prec)
@@ -803,7 +799,7 @@ stap_parse_argument_1 (struct stap_parse_info *p, int has_lhs,
 
       /* While we still have operators, try to parse another
         right-side, but using the current right-side as a left-side.  */
-      while (*p->arg && stap_is_operator (*p->arg))
+      while (*p->arg && stap_is_operator (p->arg))
        {
          enum exp_opcode lookahead_opcode;
          enum stap_operand_prec lookahead_prec;
@@ -811,7 +807,7 @@ stap_parse_argument_1 (struct stap_parse_info *p, int has_lhs,
          /* Saving the current expression buffer position.  The explanation
             is the same as above.  */
          tmp_exp_buf = p->arg;
-         stap_get_opcode (&tmp_exp_buf, &lookahead_opcode);
+         lookahead_opcode = stap_get_opcode (&tmp_exp_buf);
          lookahead_prec = stap_get_operator_prec (lookahead_opcode);
 
          if (lookahead_prec <= prec)
@@ -1013,11 +1009,36 @@ stap_get_probe_argument_count (struct probe *probe_generic,
    otherwise.  */
 
 static int
-stap_is_operator (char op)
+stap_is_operator (const char *op)
 {
-  return (op == '+' || op == '-' || op == '*' || op == '/'
-         || op == '>' || op == '<' || op == '!' || op == '^'
-         || op == '|' || op == '&' || op == '%' || op == '=');
+  int ret = 1;
+
+  switch (*op)
+    {
+    case '*':
+    case '/':
+    case '%':
+    case '^':
+    case '!':
+    case '+':
+    case '-':
+    case '<':
+    case '>':
+    case '|':
+    case '&':
+      break;
+
+    case '=':
+      if (op[1] != '=')
+       ret = 0;
+      break;
+
+    default:
+      /* We didn't find any operator.  */
+      ret = 0;
+    }
+
+  return ret;
 }
 
 static struct stap_probe_arg *