[2/3] Add a fast_hash function in common-utils
Commit Message
Also updates a caller in symtab.c. For now this just calls htab_hash_string
but the next patch will change it to xxhash, if available.
gdb/ChangeLog:
2019-09-27 Christian Biesinger <cbiesinger@google.com>
* utils.c (fast_hash): New function.
* utils.h (fast_hash): New function.
* symtab.c (hash_demangled_name_entry): Call new function
fast_hash.
---
gdb/symtab.c | 3 ++-
gdb/utils.c | 7 +++++++
gdb/utils.h | 2 ++
3 files changed, 11 insertions(+), 1 deletion(-)
@@ -70,6 +70,7 @@
#include <algorithm>
#include "gdbsupport/gdb_string_view.h"
#include "gdbsupport/pathstuff.h"
+#include "gdbsupport/common-utils.h"
/* Forward declarations for local functions. */
@@ -727,7 +728,7 @@ hash_demangled_name_entry (const void *data)
const struct demangled_name_entry *e
= (const struct demangled_name_entry *) data;
- return htab_hash_string (e->mangled.data ());
+ return fast_hash (e->mangled.data (), e->mangled.length ());
}
/* Equality function for the demangled name hash. */
@@ -3377,6 +3377,13 @@ copy_bitwise (gdb_byte *dest, ULONGEST dest_offset,
}
}
+unsigned int
+fast_hash (const char* str, size_t len)
+{
+ gdb_assert (str[len] == '\0');
+ return htab_hash_string (str);
+}
+
void
_initialize_utils (void)
{
@@ -546,4 +546,6 @@ extern void copy_bitwise (gdb_byte *dest, ULONGEST dest_offset,
const gdb_byte *source, ULONGEST source_offset,
ULONGEST nbits, int bits_big_endian);
+extern unsigned int fast_hash (const char* str, size_t len);
+
#endif /* UTILS_H */