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enhanced checks in lambda processing

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This commit is contained in:
hyung-hwan 2014-01-21 10:12:15 +00:00
parent d7eae56e90
commit 3ef11302e1
3 changed files with 80 additions and 55 deletions
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86
lib/h2-scheme-execute-apply.adb
View File

@ -15,12 +15,16 @@ procedure Apply is
Ptr: Object_Pointer := Args;
A: Object_Pointer;
begin
if Ptr = Nil_Pointer or else Get_Cdr(Ptr) /= Nil_Pointer then
if not Is_Cons(Ptr) or else Get_Cdr(Ptr) /= Nil_Pointer then
Ada.Text_IO.Put_Line ("WRONG NUMBER OF ARGUMETNS FOR CAR");
raise Syntax_Error;
end if;
A := Get_Car(Ptr); -- the first argument
if not Is_Cons(A) then
Ada.Text_IO.Put_Line ("EXPECTED CONS-CELL FOR CAR");
raise Evaluation_Error;
end if;
Pop_Frame (Interp); -- Done with the current frame
Chain_Frame_Result (Interp, Interp.Stack, Get_Car(A));
@ -30,12 +34,16 @@ Ada.Text_IO.Put_Line ("WRONG NUMBER OF ARGUMETNS FOR CAR");
Ptr: Object_Pointer := Args;
A: Object_Pointer;
begin
if Ptr = Nil_Pointer or else Get_Cdr(Ptr) /= Nil_Pointer then
if not Is_Cons(Ptr) or else Get_Cdr(Ptr) /= Nil_Pointer then
Ada.Text_IO.Put_Line ("WRONG NUMBER OF ARGUMETNS FOR CDR");
raise Syntax_Error;
end if;
A := Get_Car(Ptr); -- the first argument
if not Is_Cons(A) then
Ada.Text_IO.Put_Line ("EXPECTED CONS-CELL FOR CDR");
raise Evaluation_Error;
end if;
Pop_Frame (Interp); -- Done with the current frame
Chain_Frame_Result (Interp, Interp.Stack, Get_Cdr(A));
@ -46,7 +54,7 @@ Ada.Text_IO.Put_Line ("WRONG NUMBER OF ARGUMETNS FOR CDR");
A: Object_Pointer;
B: Object_Pointer;
begin
if Ptr = Nil_Pointer or else Get_Cdr(Ptr) = Nil_Pointer or else Get_Cdr(Get_Cdr(Ptr)) /= Nil_Pointer then
if not Is_Cons(Ptr) or else not Is_Cons(Get_Cdr(Ptr)) or else Get_Cdr(Get_Cdr(Ptr)) /= Nil_Pointer then
Ada.Text_IO.Put_Line ("WRONG NUMBER OF ARGUMETNS FOR CONS");
raise Syntax_Error;
end if;
@ -64,12 +72,16 @@ Ada.Text_IO.Put_Line ("WRONG NUMBER OF ARGUMETNS FOR CONS");
A: Object_Pointer;
B: Object_Pointer;
begin
if Ptr = Nil_Pointer or else Get_Cdr(Ptr) = Nil_Pointer or else Get_Cdr(Get_Cdr(Ptr)) /= Nil_Pointer then
if not Is_Cons(Ptr) or else not Is_Cons(Get_Cdr(Ptr)) or else Get_Cdr(Get_Cdr(Ptr)) /= Nil_Pointer then
Ada.Text_IO.Put_Line ("WRONG NUMBER OF ARGUMETNS FOR SET-CAR!");
raise Syntax_Error;
end if;
A := Get_Car(Ptr); -- the first argument
if not Is_Cons(A) then
Ada.Text_IO.Put_Line ("EXPECTED CONS-CELL FOR Setcar");
raise Evaluation_Error;
end if;
B := Get_Car(Get_Cdr(Ptr)); -- the second argument
Set_Car (A, B); -- change car
@ -82,12 +94,16 @@ Ada.Text_IO.Put_Line ("WRONG NUMBER OF ARGUMETNS FOR SET-CAR!");
A: Object_Pointer;
B: Object_Pointer;
begin
if Ptr = Nil_Pointer or else Get_Cdr(Ptr) = Nil_Pointer or else Get_Cdr(Get_Cdr(Ptr)) /= Nil_Pointer then
if not Is_Cons(Ptr) or else not Is_Cons(Get_Cdr(Ptr)) or else Get_Cdr(Get_Cdr(Ptr)) /= Nil_Pointer then
Ada.Text_IO.Put_Line ("WRONG NUMBER OF ARGUMETNS FOR SET-CDR!");
raise Syntax_Error;
end if;
A := Get_Car(Ptr); -- the first argument
if not Is_Cons(A) then
Ada.Text_IO.Put_Line ("EXPECTED CONS-CELL FOR Setcdr");
raise Evaluation_Error;
end if;
B := Get_Car(Get_Cdr(Ptr)); -- the second argument
Set_Cdr (A, B); -- change cdr
@ -103,7 +119,7 @@ Ada.Text_IO.Put_Line ("WRONG NUMBER OF ARGUMETNS FOR SET-CDR!");
Num: Object_Integer := 0; -- TODO: support BIGNUM
Car: Object_Pointer;
begin
while Ptr /= Nil_Pointer loop
while Is_Cons(Ptr) loop
-- TODO: check if car is an integer or bignum or something else.
-- if something else, error
Car := Get_Car(Ptr);
@ -124,7 +140,7 @@ Ada.Text_IO.Put ("NOT INTEGER FOR ADD"); Print (Interp, Car);
Num: Object_Integer := 0; -- TODO: support BIGNUM
Car: Object_Pointer;
begin
if Ptr /= Nil_Pointer then
if Is_Cons(Ptr) then
Car := Get_Car(Ptr);
if not Is_Integer(Car) then
raise Evaluation_Error;
@ -132,7 +148,7 @@ Ada.Text_IO.Put ("NOT INTEGER FOR ADD"); Print (Interp, Car);
Num := Pointer_To_Integer(Car);
Ptr := Get_Cdr(Ptr);
while Ptr /= Nil_Pointer loop
while Is_Cons(Ptr) loop
-- TODO: check if car is an integer or bignum or something else.
-- if something else, error
Car := Get_Car(Ptr);
@ -153,7 +169,7 @@ Ada.Text_IO.Put ("NOT INTEGER FOR ADD"); Print (Interp, Car);
Num: Object_Integer := 1; -- TODO: support BIGNUM
Car: Object_Pointer;
begin
while Ptr /= Nil_Pointer loop
while Is_Cons(Ptr) loop
-- TODO: check if car is an integer or bignum or something else.
-- if something else, error
Car := Get_Car(Ptr);
@ -174,7 +190,7 @@ Ada.Text_IO.Put ("NOT INTEGER FOR MULTIPLY"); Print (Interp, Car);
Num: Object_Integer := 1; -- TODO: support BIGNUM
Car: Object_Pointer;
begin
while Ptr /= Nil_Pointer loop
while Is_Cons(Ptr) loop
-- TODO: check if car is an integer or bignum or something else.
-- if something else, error
Car := Get_Car(Ptr);
@ -192,12 +208,12 @@ Ada.Text_IO.Put ("NOT INTEGER FOR MULTIPLY"); Print (Interp, Car);
procedure Apply_Closure is
Fbody: aliased Object_Pointer;
Param: aliased Object_Pointer;
Arg: aliased Object_Pointer;
Formal: aliased Object_Pointer;
Actual: aliased Object_Pointer;
begin
Push_Top (Interp, Fbody'Unchecked_Access);
Push_Top (Interp, Param'Unchecked_Access);
Push_Top (Interp, Arg'Unchecked_Access);
Push_Top (Interp, Formal'Unchecked_Access);
Push_Top (Interp, Actual'Unchecked_Access);
-- For a closure created of "(lambda (x y) (+ x y) (* x y))"
-- Get_Closure_Code(Func) returns "((x y) (+ x y) (* x y))"
@ -206,47 +222,47 @@ Ada.Text_IO.Put ("NOT INTEGER FOR MULTIPLY"); Print (Interp, Car);
Interp.Environment := Make_Environment (Interp.Self, Get_Closure_Environment(Func));
Fbody := Get_Closure_Code(Func);
pragma Assert (Is_Cons(Fbody)); -- the reader must ensure this.
pragma Assert (Is_Cons(Fbody)); -- the lambda evaluator must ensure this.
Param := Get_Car(Fbody); -- Formal argument list
Arg := Args; -- Actual argument list
Formal := Get_Car(Fbody); -- Formal argument list
Actual := Args; -- Actual argument list
Fbody := Get_Cdr(Fbody); -- Real function body
pragma Assert (Is_Cons(Fbody)); -- the lambda evaluator must ensure this.
if Is_Symbol(Param) then
if Is_Symbol(Formal) then
-- Closure made of a lambda expression with a single formal argument
-- e.g) (lambda x (car x))
-- Apply the whole actual argument list to the closure.
Print (Interp, Arg);
Put_Environment (Interp, Param, Arg);
Put_Environment (Interp, Formal, Actual);
else
while Is_Cons(Param) loop
if not Is_Cons(Arg) then
Ada.Text_IO.Put_Line (">>>> Too few arguments <<<<");
while Is_Cons(Formal) loop
if not Is_Cons(Actual) then
Ada.Text_IO.Put_Line (">>>> Too few arguments for CLOSURE <<<<");
raise Evaluation_Error;
end if;
-- Insert the key/value pair into the environment
Put_Environment (Interp, Get_Car(Param), Get_Car(Arg));
Put_Environment (Interp, Get_Car(Formal), Get_Car(Actual));
Param := Get_Cdr(Param);
Arg := Get_Cdr(Arg);
Formal := Get_Cdr(Formal);
Actual := Get_Cdr(Actual);
end loop;
-- Perform cosmetic checks for the parameter list
if Param /= Nil_Pointer then
Ada.Text_IO.Put_Line (">>> GARBAGE IN PARAMETER LIST <<<");
raise Syntax_Error;
end if;
if Is_Symbol(Formal) then
-- The last formal argument to the closure is in a CDR.
-- Assign the remaining actual arguments to the last formal argument
-- e.g) ((lambda (x y . z) z) 1 2 3 4 5)
Put_Environment (Interp, Formal, Actual);
else
-- The lambda evaluator must ensure all formal arguments are symbols.
pragma Assert (Formal = Nil_Pointer);
-- Perform cosmetic checks for the argument list
if Is_Cons(Arg) then
if Actual /= Nil_Pointer then
Ada.Text_IO.Put_Line (">>>> TOO MANY ARGUMETNS FOR CLOSURE <<<<");
raise Evaluation_Error;
elsif Arg /= Nil_Pointer then
Ada.Text_IO.Put_Line (">>> GARBAGE IN ARGUMENT LIST <<<");
raise Syntax_Error;
end if;
end if;
end if;

30
lib/h2-scheme-execute-evaluate.adb
View File

@ -119,19 +119,35 @@ Ada.Text_IO.Put_Line ("NO ALTERNATE");
-- (lambda x ...)
null;
elsif Is_Cons(Car) then
Cdr := Car;
declare
Formals: Object_Pointer := Car;
V: Object_Pointer;
begin
Cdr := Formals;
loop
Cdr := Get_Cdr(Cdr);
exit when not Is_Cons(Cdr);
Car := Get_Car(Cdr);
Car := Get_Car(Cdr); -- <formal argument>
if not Is_Symbol(Car) then
Ada.Text_IO.Put_Line ("WRONG FORMALS FOR LAMBDA");
Ada.Text_IO.Put_Line ("WRONG FORMAL FOR LAMBDA");
raise Syntax_Error;
end if;
-- TODO: Check duplicate symbol names???
V := Formals;
loop
exit when V = Cdr;
if Get_Car(V) = Car then
Ada.Text_IO.Put_Line ("DUPLICATE FORMAL FOR LAMBDA");
raise Syntax_Error;
end if;
V := Get_Cdr(V);
end loop;
Cdr := Get_Cdr(Cdr);
exit when not Is_Cons(Cdr);
end loop;
end;
if Cdr /= Nil_Pointer and then not Is_Symbol(Cdr) then
Ada.Text_IO.Put_Line ("FUCKING CDR IN FORMALS FOR LAMBDA");
raise Syntax_Error;

7
lib/h2-scheme.adb
View File

@ -1668,19 +1668,12 @@ Ada.Text_IO.Put_Line ("Make_String...");
-- TODO: disallow garbage collecion during initialization.
Initialize_Heap (Initial_Heap_Size);
ada.text_io.put_line ("kkkkkkkkkkkkkk");
Interp.Mark := Make_Mark(Interp.Self, 0); -- to indicate the end of cons evaluation
ada.text_io.put_line ("xxxxxxxxxxxxxx");
Interp.Root_Environment := Make_Environment(Interp.Self, Nil_Pointer);
ada.text_io.put_line ("zzzzzzzzzzzzzzzzzz");
Interp.Environment := Interp.Root_Environment;
Make_Syntax_Objects;
print (interp, interp.mark);
ada.text_io.put_line ("zzzzzzzzzzzzzzzzzz 00");
Make_Procedure_Objects;
ada.text_io.put_line ("zzzzzzzzzzzzzzzzzz 00--00");
Make_Common_Symbol_Objects;
ada.text_io.put_line ("zzzzzzzzzzzzzzzzzz 11");
exception
when others =>