Details

Comments and small improvements in the manual.

lobject.h

@@ -112,7 +112,7 @@ typedef struct TValue {
 #define settt_(o,t)	((o)->tt_=(t))
 
 
-/* main macro to copy values (from 'obj1' to 'obj2') */
+/* main macro to copy values (from 'obj2' to 'obj1') */
 #define setobj(L,obj1,obj2) \
 	{ TValue *io1=(obj1); const TValue *io2=(obj2); \
           io1->value_ = io2->value_; settt_(io1, io2->tt_); \

lopcodes.h

@@ -190,7 +190,8 @@ enum OpMode {iABC, iABx, iAsBx, iAx, isJ};  /* basic instruction formats */
 
 
 /*
-** grep "ORDER OP" if you change these enums
+** Grep "ORDER OP" if you change these enums. Opcodes marked with a (*)
+** has extra descriptions in the notes after the enumeration.
 */
 
 typedef enum {
@@ -203,7 +204,7 @@ OP_LOADF,/*	A sBx	R[A] := (lua_Number)sBx				*/
 OP_LOADK,/*	A Bx	R[A] := K[Bx]					*/
 OP_LOADKX,/*	A	R[A] := K[extra arg]				*/
 OP_LOADFALSE,/*	A	R[A] := false					*/
-OP_LFALSESKIP,/*A	R[A] := false; pc++				*/
+OP_LFALSESKIP,/*A	R[A] := false; pc++	(*)			*/
 OP_LOADTRUE,/*	A	R[A] := true					*/
 OP_LOADNIL,/*	A B	R[A], R[A+1], ..., R[A+B] := nil		*/
 OP_GETUPVAL,/*	A B	R[A] := UpValue[B]				*/
@@ -254,7 +255,7 @@ OP_BXOR,/*	A B C	R[A] := R[B] ~ R[C]				*/
 OP_SHL,/*	A B C	R[A] := R[B] << R[C]				*/
 OP_SHR,/*	A B C	R[A] := R[B] >> R[C]				*/
 
-OP_MMBIN,/*	A B C	call C metamethod over R[A] and R[B]		*/
+OP_MMBIN,/*	A B C	call C metamethod over R[A] and R[B]	(*)	*/
 OP_MMBINI,/*	A sB C k	call C metamethod over R[A] and sB	*/
 OP_MMBINK,/*	A B C k		call C metamethod over R[A] and K[B]	*/
 
@@ -280,7 +281,7 @@ OP_GTI,/*	A sB k	if ((R[A] > sB) ~= k) then pc++			*/
 OP_GEI,/*	A sB k	if ((R[A] >= sB) ~= k) then pc++		*/
 
 OP_TEST,/*	A k	if (not R[A] == k) then pc++			*/
-OP_TESTSET,/*	A B k	if (not R[B] == k) then pc++ else R[A] := R[B]	*/
+OP_TESTSET,/*	A B k	if (not R[B] == k) then pc++ else R[A] := R[B] (*) */
 
 OP_CALL,/*	A B C	R[A], ... ,R[A+C-2] := R[A](R[A+1], ... ,R[A+B-1]) */
 OP_TAILCALL,/*	A B C k	return R[A](R[A+1], ... ,R[A+B-1])		*/
@@ -315,6 +316,18 @@ OP_EXTRAARG/*	Ax	extra (larger) argument for previous opcode	*/
 
 /*===========================================================================
   Notes:
+
+  (*) Opcode OP_LFALSESKIP is used to convert a condition to a boolean
+  value, in a code equivalent to (not cond ? false : true).  (It
+  produces false and skips the next instruction producing true.)
+
+  (*) Opcodes OP_MMBIN and variants follow each arithmetic and
+  bitwise opcode. If the operation succeeds, it skips this next
+  opcode. Otherwise, this opcode calls the corresponding metamethod.
+
+  (*) Opcode OP_TESTSET is used in short-circuit expressions that need
+  both to jump and to produce a value, such as (a = b or c).
+
   (*) In OP_CALL, if (B == 0) then B = top - A. If (C == 0), then
   'top' is set to last_result+1, so next open instruction (OP_CALL,
   OP_RETURN*, OP_SETLIST) may use 'top'.

lstate.c

@@ -269,7 +269,7 @@ static void preinit_thread (lua_State *L, global_State *g) {
 static void close_state (lua_State *L) {
   global_State *g = G(L);
   if (!completestate(g))  /* closing a partially built state? */
-    luaC_freeallobjects(L);  /* jucst collect its objects */
+    luaC_freeallobjects(L);  /* just collect its objects */
   else {  /* closing a fully built state */
     luaD_closeprotected(L, 1, LUA_OK);  /* close all upvalues */
     luaC_freeallobjects(L);  /* collect all objects */

ltablib.c

@@ -147,7 +147,7 @@ static void addfield (lua_State *L, luaL_Buffer *b, lua_Integer i) {
   lua_geti(L, 1, i);
   if (l_unlikely(!lua_isstring(L, -1)))
     luaL_error(L, "invalid value (%s) at index %I in table for 'concat'",
-                  luaL_typename(L, -1), i);
+                  luaL_typename(L, -1), (LUAI_UACINT)i);
   luaL_addvalue(b);
 }
 

manual/manual.of

@@ -5915,6 +5915,9 @@ previously pushed on the stack
 on top of the library table.
 These values are popped from the stack after the registration.
 
+A function with a @id{NULL} value represents a placeholder,
+which is filled with @false.
+
 }
 
 @APIEntry{void luaL_setmetatable (lua_State *L, const char *tname);|
@@ -6397,7 +6400,7 @@ This means that any error @N{inside @T{f}} is not propagated;
 instead, @id{pcall} catches the error
 and returns a status code.
 Its first result is the status code (a boolean),
-which is true if the call succeeds without errors.
+which is @true if the call succeeds without errors.
 In such case, @id{pcall} also returns all results from the call,
 after this first result.
 In case of any error, @id{pcall} returns @false plus the error object.
@@ -6603,7 +6606,7 @@ an object with type @T{"thread"}.
 
 @LibEntry{coroutine.isyieldable ([co])|
 
-Returns true when the coroutine @id{co} can yield.
+Returns @true when the coroutine @id{co} can yield.
 The default for @id{co} is the running coroutine.
 
 A coroutine is yieldable if it is not the main thread and
@@ -6635,7 +6638,7 @@ If there is any error,
 @LibEntry{coroutine.running ()|
 
 Returns the running coroutine plus a boolean,
-true when the running coroutine is the main one.
+@true when the running coroutine is the main one.
 
 }
 
@@ -6730,7 +6733,7 @@ If the loader returns any non-nil value,
 @id{require} assigns the returned value to @T{package.loaded[modname]}.
 If the loader does not return a non-nil value and
 has not assigned any value to @T{package.loaded[modname]},
-then @id{require} assigns @Rw{true} to this entry.
+then @id{require} assigns @true to this entry.
 In any case, @id{require} returns the
 final value of @T{package.loaded[modname]}.
 Besides that value, @id{require} also returns as a second result
@@ -7051,7 +7054,7 @@ otherwise, it returns @fail.
 A third, optional numeric argument @id{init} specifies
 where to start the search;
 its default value @N{is 1} and can be negative.
-A value of @true as a fourth, optional argument @id{plain}
+A @true as a fourth, optional argument @id{plain}
 turns off the pattern matching facilities,
 so the function does a plain @Q{find substring} operation,
 with no characters in @id{pattern} being considered magic.
@@ -8077,7 +8080,7 @@ or @fail if @id{x} is not a number.
 @LibEntry{math.ult (m, n)|
 
 Returns a boolean,
-true if and only if integer @id{m} is below integer @id{n} when
+@true if and only if integer @id{m} is below integer @id{n} when
 they are compared as @x{unsigned integers}.
 
 }
@@ -8490,13 +8493,13 @@ When called without a @id{command},
 @LibEntry{os.exit ([code [, close]])|
 
 Calls the @ANSI{exit} to terminate the host program.
-If @id{code} is @Rw{true},
+If @id{code} is @true,
 the returned status is @idx{EXIT_SUCCESS};
-if @id{code} is @Rw{false},
+if @id{code} is @false,
 the returned status is @idx{EXIT_FAILURE};
 if @id{code} is a number,
 the returned status is this number.
-The default value for @id{code} is @Rw{true}.
+The default value for @id{code} is @true.
 
 If the optional second argument @id{close} is true,
 closes the Lua state before exiting.