nik/lush
1
1
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Changed internal representation of booleans

Browse Source 
Instead of an explicit value (field 'b'), true and false use different
tag variants. This avoids reading an extra field and results in more
direct code. (Most code that uses booleans needs to distinguish between
true and false anyway.)
This commit is contained in:
Roberto Ierusalimschy
2020-01-06 11:38:31 -03:00
parent e3c83835e7
commit 5ff408d218
14 changed files with 87 additions and 52 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
lobject.h
View File

@@ -44,7 +44,6 @@
typedef union Value {
struct GCObject *gc; /* collectable objects */
void *p; /* light userdata */
int b; /* booleans */
lua_CFunction f; /* light C functions */
lua_Integer i; /* integer numbers */
lua_Number n; /* float numbers */
@@ -210,16 +209,20 @@ typedef StackValue *StkId;
** ===================================================================
*/
#define ttisboolean(o) checktag((o), LUA_TBOOLEAN)
#define bvalue(o) check_exp(ttisboolean(o), val_(o).b)
#define LUA_TFALSE (LUA_TBOOLEAN | (1 << 4))
#define LUA_TTRUE (LUA_TBOOLEAN | (2 << 4))
#define bvalueraw(v) ((v).b)
#define ttisboolean(o) checktype((o), LUA_TBOOLEAN)
#define ttisfalse(o) checktag((o), LUA_TFALSE)
#define ttistrue(o) checktag((o), LUA_TTRUE)
#define l_isfalse(o) (ttisboolean(o) ? bvalue(o) == 0 : ttisnil(o))
#define setbvalue(obj,x) \
{ TValue *io=(obj); val_(io).b=(x); settt_(io, LUA_TBOOLEAN); }
#define l_isfalse(o) (ttisfalse(o) || ttisnil(o))
#define setbfvalue(obj) settt_(obj, LUA_TFALSE)
#define setbtvalue(obj) settt_(obj, LUA_TTRUE)
/* }================================================================== */