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authorTeddy <ted.sybil@gmail.com>2013-08-04 11:50:41 +0800
committerTeddy <ted.sybil@gmail.com>2013-08-04 11:50:41 +0800
commit65f17438de5983ca010e10b4b24c5da65756a9b5 (patch)
treedfa88443d6cd10a14f587377f101e14359e98f56 /builtin.cpp
parentd42c4bd97982c1252c5ad638a11aea5319c4be7f (diff)
added exception facilities
Diffstat (limited to 'builtin.cpp')
-rw-r--r--builtin.cpp29
1 files changed, 23 insertions, 6 deletions
diff --git a/builtin.cpp b/builtin.cpp
index 1ac0cf2..806d911 100644
--- a/builtin.cpp
+++ b/builtin.cpp
@@ -1,3 +1,5 @@
+#include "exc.h"
+#include "consts.h"
#include "builtin.h"
#include <cstdio>
#include <sstream>
@@ -120,7 +122,7 @@ Cons *SpecialOptLambda::call(ArgList *args, Environment * &envt,
Continuation * &cont, FrameObj ** &top_ptr) {
Cons *ret_addr = static_cast<RetAddr*>(*top_ptr)->addr;
Cons *pc = static_cast<Cons*>(ret_addr->car);
- SymbolList *para_list = dynamic_cast<SymbolList*>(pc->cdr->car); // parameter list
+ SymbolList *para_list = static_cast<SymbolList*>(pc->cdr->car);
// Clear the flag to avoid side-effects (e.g. proc calling)
FILL_MARKS(pc, false);
@@ -157,16 +159,25 @@ Cons *SpecialOptDefine::call(ArgList *args, Environment * &envt,
EvalObj *obj;
SymObj *id;
// TODO: check identifier
- if (pc->cdr->car->is_simple_obj())
+ EvalObj *first = pc->cdr->car;
+ if (first->is_simple_obj())
{
- id = dynamic_cast<SymObj*>(pc->cdr->car);
+ if (!first->is_sym_obj())
+ throw TokenError(first->ext_repr(), SYN_ERR_NOT_AN_ID);
+
+ id = static_cast<SymObj*>(first);
obj = args->cdr->car;
}
else
{
// static_cast because of is_simple_obj() is false
Cons *plst = static_cast<Cons*>(pc->cdr->car);
- id = dynamic_cast<SymObj*>(plst->car);
+ if (plst == empty_list)
+ throw NormalError(SYN_ERR_ID_EXPECTED);
+ if (!plst->car->is_sym_obj())
+ throw TokenError(first->ext_repr(), SYN_ERR_NOT_AN_ID);
+
+ id = static_cast<SymObj*>(plst->car);
ArgList *para_list = plst->cdr;
// Clear the flag to avoid side-effects (e.g. proc calling)
FILL_MARKS(pc, false);
@@ -197,9 +208,15 @@ Cons *SpecialOptSet::call(ArgList *args, Environment * &envt,
Continuation * &cont, FrameObj ** &top_ptr) {
Cons *ret_addr = static_cast<RetAddr*>(*top_ptr)->addr;
Cons *pc = static_cast<Cons*>(ret_addr->car);
- SymObj *id = dynamic_cast<SymObj*>(pc->cdr->car);
+ EvalObj *first = pc->cdr->car;
+
+ if (!first->is_sym_obj())
+ throw TokenError(first->ext_repr(), SYN_ERR_NOT_AN_ID);
+
+ SymObj *id = static_cast<SymObj*>(first);
+
bool flag = envt->add_binding(id, args->cdr->car, false);
- // TODO: throw an exc "unbound variable"
+ if (!flag) throw TokenError(id->ext_repr(), SYN_ERR_UNBOUND_VAR);
*top_ptr++ = new UnspecObj();
return ret_addr->next;
}