5 files changed, 29 insertions, 22 deletions
diff --git a/src/nvim/CMakeLists.txt b/src/nvim/CMakeLists.txt
index 49edfda838..f2b75dca2a 100644
--- a/src/nvim/CMakeLists.txt
+++ b/src/nvim/CMakeLists.txt
@@ -326,6 +326,7 @@ elseif(CLANG_TSAN)
   message(STATUS "Enabling Clang thread sanitizer for nvim.")
   set_property(TARGET nvim APPEND_STRING PROPERTY COMPILE_FLAGS "-DEXITFREE ")
   set_property(TARGET nvim APPEND_STRING PROPERTY COMPILE_FLAGS "-fsanitize=thread ")
+  set_property(TARGET nvim APPEND_STRING PROPERTY COMPILE_FLAGS "-fPIE ")
   set_property(TARGET nvim APPEND_STRING PROPERTY LINK_FLAGS "-fsanitize=thread ")
 endif()
 
diff --git a/src/nvim/globals.h b/src/nvim/globals.h
index 301a2c1663..f81fb43eaf 100644
--- a/src/nvim/globals.h
+++ b/src/nvim/globals.h
@@ -788,8 +788,28 @@ EXTERN int vr_lines_changed INIT(= 0);      /* #Lines changed by "gR" so far */
 /// Encoding used when 'fencs' is set to "default"
 EXTERN char_u *fenc_default INIT(= NULL);
 
-// To speed up BYTELEN() we keep a table with the byte lengths for utf-8
-EXTERN char utf8len_tab[256];
+// To speed up BYTELEN(); keep a lookup table to quickly get the length in
+// bytes of a UTF-8 character from the first byte of a UTF-8 string.  Bytes
+// which are illegal when used as the first byte have a 1.  The NUL byte has
+// length 1.
+EXTERN char utf8len_tab[256] INIT(= {
+  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+  3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+  4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 1, 1,
+});
 
 # if defined(USE_ICONV) && defined(DYNAMIC_ICONV)
 /* Pointers to functions and variables to be loaded at runtime */
diff --git a/src/nvim/mbyte.c b/src/nvim/mbyte.c
index 7be0be7106..2ecd86974e 100644
--- a/src/nvim/mbyte.c
+++ b/src/nvim/mbyte.c
@@ -69,24 +69,6 @@ struct interval {
 #endif
 
 /*
- * Lookup table to quickly get the length in bytes of a UTF-8 character from
- * the first byte of a UTF-8 string.
- * Bytes which are illegal when used as the first byte have a 1.
- * The NUL byte has length 1.
- */
-char utf8len_tab[256] =
-{
-  1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
-  1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
-  1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
-  1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
-  1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
-  1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
-  2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
-  3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,5,5,5,5,6,6,1,1,
-};
-
-/*
  * Like utf8len_tab above, but using a zero for illegal lead bytes.
  */
 static uint8_t utf8len_tab_zero[256] =
diff --git a/src/nvim/msgpack_rpc/helpers.c b/src/nvim/msgpack_rpc/helpers.c
index c3a909692f..b0cfe2d6cd 100644
--- a/src/nvim/msgpack_rpc/helpers.c
+++ b/src/nvim/msgpack_rpc/helpers.c
@@ -326,7 +326,9 @@ void msgpack_rpc_from_string(String result, msgpack_packer *res)
   FUNC_ATTR_NONNULL_ARG(2)
 {
   msgpack_pack_str(res, result.size);
-  msgpack_pack_str_body(res, result.data, result.size);
+  if (result.size > 0) {
+    msgpack_pack_str_body(res, result.data, result.size);
+  }
 }
 
 typedef struct {
diff --git a/src/nvim/shada.c b/src/nvim/shada.c
index 01c0807d82..d902079739 100644
--- a/src/nvim/shada.c
+++ b/src/nvim/shada.c
@@ -1575,7 +1575,9 @@ static char *shada_filename(const char *file)
     do { \
       const String s_ = (s); \
       msgpack_pack_bin(spacker, s_.size); \
-      msgpack_pack_bin_body(spacker, s_.data, s_.size); \
+      if (s_.size > 0) { \
+        msgpack_pack_bin_body(spacker, s_.data, s_.size); \
+      } \
     } while (0)
 
 /// Write single ShaDa entry