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, 16 insertions, 7 deletions

diff --git a/apps/plugins/lua/lstring.h b/apps/plugins/lua/lstring.h
index c88e4c1..8ca69b8 100644
--- a/apps/plugins/lua/lstring.h
+++ b/apps/plugins/lua/lstring.h
@@ -12,20 +12,29 @@
 #include "lobject.h"
 #include "lstate.h"
 
-
-#define sizestring(s)	(sizeof(union TString)+((s)->len+1)*sizeof(char))
+/* ROCKLUA ADDED */
+#define TSTR_INBLOB    0 /* string will be allocated at end of tstring struct */
+#define TSTR_INBIN     1 /* string is static within binary, pointer stored    */
+#define TSTR_FIXED     2 /* string won't be collected for duration of L state */
+#define TSTR_CHKSZ     4 /* luaS_newllocstr shall determine size of string    */
+#define TSTR_ISLIT     8 | TSTR_INBIN /* literal string static within binary  */
+#define sizetstring(t, l) (sizeof(union TString) + (testbits((t), TSTR_INBIN) ? \
+                                   sizeof(const char **) : ((l)+1)*sizeof(char)))
 
 #define sizeudata(u)	(sizeof(union Udata)+(u)->len)
 
-#define luaS_new(L, s)	(luaS_newlstr(L, s, strlen(s)))
-#define luaS_newliteral(L, s)	(luaS_newlstr(L, "" s, \
-                                 (sizeof(s)/sizeof(char))-1))
+#define luaS_new(L, s)  (luaS_newllocstr(L, s, 0, TSTR_INBLOB | TSTR_CHKSZ))
+#define luaS_newlstr(L, s, len) (luaS_newllocstr(L, s, len, TSTR_INBLOB))
+#define luaS_newlloc(L, s, t)   (luaS_newllocstr(L, s, 0, ((t) | TSTR_CHKSZ)))
+#define luaS_newliteral(L, s)   (luaS_newllocstr(L, "" s, \
+                                 (sizeof(s)/sizeof(char))-1, TSTR_ISLIT))
 
 #define luaS_fix(s)	l_setbit((s)->tsv.marked, FIXEDBIT)
 
 LUAI_FUNC void luaS_resize (lua_State *L, int newsize);
 LUAI_FUNC Udata *luaS_newudata (lua_State *L, size_t s, Table *e);
-LUAI_FUNC TString *luaS_newlstr (lua_State *L, const char *str, size_t l);
-
+/* ROCKLUA ADDED */
+LUAI_FUNC TString *luaS_newllocstr (lua_State *L,
+                                    const char *str, size_t l, char type);
 
 #endif