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A start on error handling.

This commit is contained in:
Simon Forman 2023-03-03 19:23:15 -08:00
parent 7284a7fcf3
commit cf37e52550
1 changed files with 16 additions and 1 deletions
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17
implementations/uvm-ncc/joy_types.c
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@ -51,6 +51,13 @@ u32 head(u32 list) { return heads[VALUE_OF(list)]; }
u32 tail(u32 list) { return tails[VALUE_OF(list)]; } u32 tail(u32 list) { return tails[VALUE_OF(list)]; }
// No setjmp/longjmp, so let's have a global error value and check it after ops.
u64 error;
#define NO_ERROR 0
#define UNKNOWN_WORD_ERROR 1
#define MISSING_CLOSING_BRACKET 2
void void
print_joy_value(u32 jv) print_joy_value(u32 jv)
{ {
@ -64,7 +71,10 @@ print_joy_value(u32 jv)
print_joy_list(jv); print_joy_list(jv);
print_str("]"); print_str("]");
} else if (type == joySymbol) { } else if (type == joySymbol) {
print_str(ht_lookup(VALUE_OF(jv))); char *str = ht_lookup(VALUE_OF(jv));
if (error != NO_ERROR)
return;
print_str(str);
} }
} }
@ -73,6 +83,8 @@ print_joy_list(u32 list)
{ {
while (list) { while (list) {
print_joy_value(head(list)); print_joy_value(head(list));
if (error != NO_ERROR)
return;
list = tail(list); list = tail(list);
if (list) { if (list) {
print_str(" "); print_str(" ");
@ -153,6 +165,7 @@ ht_lookup(u32 hash)
index = (index + increment) % CAPACITY; index = (index + increment) % CAPACITY;
candidate = hash_table[index]; candidate = hash_table[index];
} }
error = UNKNOWN_WORD_ERROR;
return 0; return 0;
} }
@ -170,6 +183,8 @@ main()
u32 joy_false = JOY_VALUE(joyBool, 0); u32 joy_false = JOY_VALUE(joyBool, 0);
memset(hash_table, 0, sizeof(hash_table)); memset(hash_table, 0, sizeof(hash_table));
error = NO_ERROR;
u32 stack = empty_list; u32 stack = empty_list;