From: Pedro Alves <palves@redhat.com>
Date: Sat, 25 Nov 2017 00:33:05 +0000 (+0000)
Subject: Use TOLOWER in SYMBOL_HASH_NEXT
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=deeeba559bd0c18e06dba19f44571ee8a218fcdb;p=binutils-gdb.git

Use TOLOWER in SYMBOL_HASH_NEXT

The support for setting breakpoint in functions with ABI tags patch
will add a use of SYMBOL_HASH_NEXT in cp-support.c, which fails to
compile with:

  src/gdb/cp-support.c:38:0:
  src/gdb/cp-support.c: In function ‘unsigned int cp_search_name_hash(const char*)’:
  src/gdb/../include/safe-ctype.h:148:20: error: ‘do_not_use_tolower_with_safe_ctype’ was not declared in this scope
   #define tolower(c) do_not_use_tolower_with_safe_ctype
		      ^
  src/gdb/minsyms.h:174:18: note: in expansion of macro ‘tolower’
     ((hash) * 67 + tolower ((unsigned char) (c)) - 113)
		    ^
  src/gdb/cp-support.c:1677:14: note: in expansion of macro ‘SYMBOL_HASH_NEXT’
	 hash = SYMBOL_HASH_NEXT (hash, *string);
		^

This fixes the problem before it happens.

I was somewhat worried about whether this might have an impact with
languages that are case insensitive, but I convinced myself that it
doesn't.  As bonus, this improves GDB's minsym interning performance a
bit (3%-10%).  See
<https://sourceware.org/ml/gdb/2017-11/msg00021.html>.

gdb/ChangeLog:
2017-11-25  Pedro Alves  <palves@redhat.com>

	* dictionary.c: Include "safe-ctype.h".
	* minsyms.c: Include "safe-ctype.h".
	* minsyms.c (SYMBOL_HASH_NEXT): Use TOLOWER instead of tolower.
---

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 4e0b45efbc8..61db1b1fa88 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,9 @@
+2017-11-25  Pedro Alves  <palves@redhat.com>
+
+	* dictionary.c: Include "safe-ctype.h".
+	* minsyms.c: Include "safe-ctype.h".
+	* minsyms.c (SYMBOL_HASH_NEXT): Use TOLOWER instead of tolower.
+
 2017-11-25   Pedro Alves  <palves@redhat.com>
 
 	* completer.c (complete_line_internal_1): Skip spaces until the
diff --git a/gdb/dictionary.c b/gdb/dictionary.c
index fb307538ae1..7d26efba975 100644
--- a/gdb/dictionary.c
+++ b/gdb/dictionary.c
@@ -26,6 +26,7 @@
 #include "symtab.h"
 #include "buildsym.h"
 #include "dictionary.h"
+#include "safe-ctype.h"
 
 /* This file implements dictionaries, which are tables that associate
    symbols to names.  They are represented by an opaque type 'struct
diff --git a/gdb/minsyms.c b/gdb/minsyms.c
index a0d3bd5a717..4898da17aa7 100644
--- a/gdb/minsyms.c
+++ b/gdb/minsyms.c
@@ -52,6 +52,7 @@
 #include "cli/cli-utils.h"
 #include "symbol.h"
 #include <algorithm>
+#include "safe-ctype.h"
 
 /* See minsyms.h.  */
 
diff --git a/gdb/minsyms.h b/gdb/minsyms.h
index f326be9462d..5c0dde4de15 100644
--- a/gdb/minsyms.h
+++ b/gdb/minsyms.h
@@ -177,7 +177,7 @@ unsigned int msymbol_hash_iw (const char *);
    requirements.  */
 
 #define SYMBOL_HASH_NEXT(hash, c)			\
-  ((hash) * 67 + tolower ((unsigned char) (c)) - 113)
+  ((hash) * 67 + TOLOWER ((unsigned char) (c)) - 113)