Revamp of 'lua_pushfstring' / 'luaO_pushvfstring'

The function 'luaO_pushvfstring' now uses an internal buffer to
concatenate small strings, instead of pushing all pieces on the
stack. This avoids the creation of several small Lua strings for each
piece of the result. (For instance, a format like "n: '%d'" used to
create three intermediate strings: "n: '", the numeral, and "'".
Now it creates none.)

1 files changed, 9 insertions, 0 deletions

diff --git a/ltests.c b/ltests.c
index 40de2292..7d441d1a 100644
--- a/ltests.c
+++ b/ltests.c
@@ -1481,6 +1481,15 @@ static int runC (lua_State *L, lua_State *L1, const char *pc) {
     else if EQ("pushvalue") {
       lua_pushvalue(L1, getindex);
     }
+    else if EQ("pushfstringI") {
+      lua_pushfstring(L1, lua_tostring(L, -2), (int)lua_tointeger(L, -1));
+    }
+    else if EQ("pushfstringS") {
+      lua_pushfstring(L1, lua_tostring(L, -2), lua_tostring(L, -1));
+    }
+    else if EQ("pushfstringP") {
+      lua_pushfstring(L1, lua_tostring(L, -2), lua_topointer(L, -1));
+    }
     else if EQ("rawgeti") {
       int t = getindex;
       lua_rawgeti(L1, t, getnum);