Introduce CP_OPERATOR_STR/CP_OPERATOR_LEN and use throughout

Move LENGTH_OF_OPERATOR from cp-support.c to cp-support.h so we can
use it elsewhere.  Since there's already
CP_ANONYMOUS_NAMESPACE_STR/CP_ANONYMOUS_NAMESPACE_LEN there, follow
the same naming pattern for the new symbols.

gdb/ChangeLog:
2017-07-17  Pedro Alves  <palves@redhat.com>

	* c-exp.y (operator_stoken): Use CP_OPERATOR_LEN and
	CP_OPERATOR_STR.
	* c-typeprint.c (is_type_conversion_operator): Use
	CP_OPERATOR_STR.
	* cp-support.c (LENGTH_OF_OPERATOR): Delete.
	(cp_find_first_component_aux): Use CP_OPERATOR_STR and
	CP_OPERATOR_LEN.
	* cp-support.h (CP_OPERATOR_STR, CP_OPERATOR_LEN): New.
	* gnu-v2-abi.c (gnuv2_is_operator_name): Use CP_OPERATOR_STR.
	* gnu-v3-abi.c (gnuv3_is_operator_name): Use CP_OPERATOR_STR.
	* linespec.c (linespec_lexer_lex_string): Use CP_OPERATOR_LEN and
	CP_OPERATOR_STR.
	* location.c: Include "cp-support.h".
	(explicit_location_lex_one): Use CP_OPERATOR_LEN and
	CP_OPERATOR_STR.
	* symtab.c (operator_chars): Use CP_OPERATOR_STR and
	CP_OPERATOR_LEN.

gdb/ChangeLog

@@ -1,3 +1,23 @@
+2017-07-17  Pedro Alves  <palves@redhat.com>
+
+	* c-exp.y (operator_stoken): Use CP_OPERATOR_LEN and
+	CP_OPERATOR_STR.
+	* c-typeprint.c (is_type_conversion_operator): Use
+	CP_OPERATOR_STR.
+	* cp-support.c (LENGTH_OF_OPERATOR): Delete.
+	(cp_find_first_component_aux): Use CP_OPERATOR_STR and
+	CP_OPERATOR_LEN.
+	* cp-support.h (CP_OPERATOR_STR, CP_OPERATOR_LEN): New.
+	* gnu-v2-abi.c (gnuv2_is_operator_name): Use CP_OPERATOR_STR.
+	* gnu-v3-abi.c (gnuv3_is_operator_name): Use CP_OPERATOR_STR.
+	* linespec.c (linespec_lexer_lex_string): Use CP_OPERATOR_LEN and
+	CP_OPERATOR_STR.
+	* location.c: Include "cp-support.h".
+	(explicit_location_lex_one): Use CP_OPERATOR_LEN and
+	CP_OPERATOR_STR.
+	* symtab.c (operator_chars): Use CP_OPERATOR_STR and
+	CP_OPERATOR_LEN.
+
 2017-07-17  Pedro Alves  <palves@redhat.com>
 
 	* cli/cli-cmds.c (complete_command): Use a completion tracker

gdb/c-exp.y

@@ -1625,13 +1625,12 @@ write_destructor_name (struct parser_state *par_state, struct stoken token)
 static struct stoken
 operator_stoken (const char *op)
 {
-  static const char *operator_string = "operator";
   struct stoken st = { NULL, 0 };
   char *buf;
 
-  st.length = strlen (operator_string) + strlen (op);
+  st.length = CP_OPERATOR_LEN + strlen (op);
   buf = (char *) malloc (st.length + 1);
-  strcpy (buf, operator_string);
+  strcpy (buf, CP_OPERATOR_STR);
   strcat (buf, op);
   st.ptr = buf;
 

gdb/c-typeprint.c

@@ -547,7 +547,7 @@ is_type_conversion_operator (struct type *type, int i, int j)
      some other way, feel free to rewrite this function.  */
   const char *name = TYPE_FN_FIELDLIST_NAME (type, i);
 
-  if (!startswith (name, "operator"))
+  if (!startswith (name, CP_OPERATOR_STR))
     return 0;
 
   name += 8;

gdb/cp-support.c

@@ -931,10 +931,6 @@ cp_find_first_component (const char *name)
    the recursion easier, it also stops if it reaches an unexpected ')'
    or '>' if the value of PERMISSIVE is nonzero.  */
 
-/* Let's optimize away calls to strlen("operator").  */
-
-#define LENGTH_OF_OPERATOR 8
-
 static unsigned int
 cp_find_first_component_aux (const char *name, int permissive)
 {
@@ -1006,10 +1002,9 @@ cp_find_first_component_aux (const char *name, int permissive)
 	case 'o':
 	  /* Operator names can screw up the recursion.  */
 	  if (operator_possible
-	      && strncmp (name + index, "operator",
-			  LENGTH_OF_OPERATOR) == 0)
+	      && startswith (name + index, CP_OPERATOR_STR))
 	    {
-	      index += LENGTH_OF_OPERATOR;
+	      index += CP_OPERATOR_LEN;
 	      while (ISSPACE(name[index]))
 		++index;
 	      switch (name[index])

gdb/cp-support.h

@@ -46,6 +46,14 @@ struct using_direct;
 
 #define CP_ANONYMOUS_NAMESPACE_LEN 21
 
+/* A string representing the start of an operator name.  */
+
+#define CP_OPERATOR_STR "operator"
+
+/* The length of CP_OPERATOR_STR.  */
+
+#define CP_OPERATOR_LEN 8
+
 /* The result of parsing a name.  */
 
 struct demangle_parse_info

gdb/gnu-v2-abi.c

@@ -68,7 +68,7 @@ gnuv2_is_vtable_name (const char *name)
 static int
 gnuv2_is_operator_name (const char *name)
 {
-  return startswith (name, "operator");
+  return startswith (name, CP_OPERATOR_STR);
 }
 
 

gdb/gnu-v3-abi.c

@@ -46,7 +46,7 @@ gnuv3_is_vtable_name (const char *name)
 static int
 gnuv3_is_operator_name (const char *name)
 {
-  return startswith (name, "operator");
+  return startswith (name, CP_OPERATOR_STR);
 }
 
 

gdb/linespec.c

@@ -688,10 +688,9 @@ linespec_lexer_lex_string (linespec_parser *parser)
 	    {
 	      if ((PARSER_STATE (parser)->language->la_language
 		   == language_cplus)
-		  && (PARSER_STREAM (parser) - start) > 8
-		  /* strlen ("operator") */)
+		  && (PARSER_STREAM (parser) - start) > CP_OPERATOR_LEN)
 		{
-		  const char *p = strstr (start, "operator");
+		  const char *p = strstr (start, CP_OPERATOR_STR);
 
 		  if (p != NULL && is_operator_name (p))
 		    {

gdb/location.c

@@ -24,6 +24,7 @@
 #include "linespec.h"
 #include "cli/cli-utils.h"
 #include "probe.h"
+#include "cp-support.h"
 
 #include <ctype.h>
 #include <string.h>
@@ -473,8 +474,8 @@ explicit_location_lex_one (const char **inp,
 	{
 	  /* Special case: C++ operator,.  */
 	  if (language->la_language == language_cplus
-	      && strncmp (*inp, "operator", 8) == 0)
-	    (*inp) += 8;
+	      && startswith (*inp, CP_OPERATOR_STR))
+	    (*inp) += CP_OPERATOR_LEN;
 	  ++(*inp);
 	}
     }

gdb/symtab.c

@@ -3839,9 +3839,9 @@ static const char *
 operator_chars (const char *p, const char **end)
 {
   *end = "";
-  if (!startswith (p, "operator"))
+  if (!startswith (p, CP_OPERATOR_STR))
     return *end;
-  p += 8;
+  p += CP_OPERATOR_LEN;
 
   /* Don't get faked out by `operator' being part of a longer
      identifier.  */