lua inbinary strings

Allows saving of ram by reusing strings already stored in the binary
and storing a pointer instead of malloc and copy to get them inside
the lua state

Saves about 1.5K overall

Derivative of work by bogdanm
RAM optimizations: pseudo RO strings, functions in Flash
https://github.com/elua/elua/commit/d54659b5723bcd2b1e3900362398c72c18a9aa0b

Change-Id: I21d6dcfa32523877efd9f70fb0f88f2a02872649

1 files changed, 3 insertions, 1 deletions

diff --git a/apps/plugins/lua/lobject.h b/apps/plugins/lua/lobject.h
index 93288fe0fb..26d2a81b49 100644
--- a/apps/plugins/lua/lobject.h
+++ b/apps/plugins/lua/lobject.h
@@ -201,13 +201,14 @@ typedef union TString {
   struct {
     CommonHeader;
     lu_byte reserved;
+    lu_byte type;
     unsigned int hash;
     size_t len;
   } tsv;
 } TString;
 
 
-#define getstr(ts)      cast(const char *, (ts) + 1)
+#define getstr(ts) (luaO_getstring(ts)) /* ROCKLUA ADDED */
 #define svalue(o)       getstr(rawtsvalue(o))
 
 
@@ -371,6 +372,7 @@ LUAI_FUNC int luaO_int2fb (unsigned int x);
 LUAI_FUNC int luaO_fb2int (int x);
 LUAI_FUNC int luaO_rawequalObj (const TValue *t1, const TValue *t2);
 LUAI_FUNC int luaO_str2d (const char *s, lua_Number *result);
+LUAI_FUNC const char *luaO_getstring(const TString * ts); /* ROCKLUA ADDED */
 LUAI_FUNC const char *luaO_pushvfstring (lua_State *L, const char *fmt,
                                                        va_list argp);
 LUAI_FUNC const char *luaO_pushfstring (lua_State *L, const char *fmt, ...);