General cleanup
Memory allocation errors seem to be handled now.
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parent
3c86249f11
commit
23da396614
GPG Key ID:
B715679E3A361BE6
193
ell.c
193
ell.c
@ -160,8 +160,8 @@ new_clone (const struct item *item) {
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return NULL;
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memcpy (clone, item, size);
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if (item->type == ITEM_LIST) {
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if (clone->head && !(clone->head = new_clone_list (clone->head))) {
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if (item->type == ITEM_LIST && clone->head) {
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if (!(clone->head = new_clone_list (clone->head))) {
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free (clone);
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return NULL;
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}
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@ -475,8 +475,7 @@ parser_peek (struct parser *self, jmp_buf out) {
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!(self->error = lexer_errorf (&self->lexer, "%s", e));
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longjmp (out, 1);
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}
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if (self->token == T_STRING
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&& (self->memory_failure = self->lexer.string.memory_failure))
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if (self->token == T_STRING && self->lexer.string.memory_failure)
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longjmp (out, 1);
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self->replace_token = false;
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}
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@ -615,11 +614,9 @@ parser_run (struct parser *self, const char **e) {
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struct item *volatile result = NULL, *volatile *tail = &result;
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if (setjmp (err)) {
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item_free_list (result);
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if (e) {
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*e = self->error;
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if (self->memory_failure)
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*e = "memory allocation failure";
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}
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*e = self->error;
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if (self->memory_failure || self->lexer.string.memory_failure)
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*e = "memory allocation failure";
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return NULL;
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}
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@ -667,9 +664,6 @@ native_register (const char *name, handler_fn handler) {
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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// TODO: fill in "error_is_fatal"
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// TODO: probably add new_*() methods that set "memory_failure"
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struct context {
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struct item *variables; ///< List of variables
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@ -691,6 +685,11 @@ context_free (struct context *ctx) {
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free (ctx->error);
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}
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static bool
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check (struct context *ctx, struct item *item) {
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return !(ctx->memory_failure |= !item);
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}
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static struct item *
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get (struct context *ctx, const char *name) {
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for (struct item *iter = ctx->variables; iter; iter = iter->next)
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@ -701,49 +700,36 @@ get (struct context *ctx, const char *name) {
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static bool
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set (struct context *ctx, const char *name, struct item *value) {
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struct item *iter, *key = NULL, *pair = NULL;
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struct item *iter, *key, *pair;
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for (iter = ctx->variables; iter; iter = iter->next)
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if (!strcmp (iter->head->value, name))
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break;
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if (iter) {
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item_free (iter->head->next);
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if (!(iter->head->next = new_clone (value))) {
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ctx->memory_failure = true;
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return false;
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}
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return true;
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return check (ctx, (iter->head->next = new_clone (value)));
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}
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if ((key = new_string (name, strlen (name)))
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&& (pair = new_list (NULL))) {
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if (!((pair->head = key)->next = new_clone (value))) {
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item_free (pair);
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ctx->memory_failure = true;
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return false;
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}
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pair->next = ctx->variables;
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ctx->variables = pair;
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return true;
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} else {
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item_free_list (key);
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item_free_list (pair);
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ctx->memory_failure = true;
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if (!check (ctx, (key = new_string (name, strlen (name))))
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|| !check (ctx, (pair = new_list (key))))
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return false;
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if (!check (ctx, (key->next = new_clone (value)))) {
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item_free (pair);
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return false;
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}
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pair->next = ctx->variables;
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ctx->variables = pair;
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return true;
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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static bool
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set_error (struct context *ctx, const char *format, ...) {
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free (ctx->error);
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va_list ap;
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va_start (ap, format);
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ctx->error = vformat (format, ap);
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va_end (ap);
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if (!ctx->error)
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free (ctx->error);
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if (!(ctx->error = vformat (format, ap)))
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ctx->memory_failure = true;
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va_end (ap);
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return false;
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}
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@ -760,7 +746,7 @@ rename_arguments (struct context *ctx, struct item *names) {
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return true;
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if (names->type != ITEM_STRING)
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continue;
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return set_error (ctx, "argument names must be strings");
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if (!set (ctx, names->value, value))
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return false;
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}
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@ -771,44 +757,33 @@ static bool execute_statement (struct context *, struct item *, struct item **);
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static bool execute (struct context *ctx, struct item *body, struct item **);
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static bool
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execute_args_list (struct context *ctx, struct item *args, struct item **res) {
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for (struct item *arg = args; arg; arg = arg->next) {
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execute_args (struct context *ctx, struct item *args, struct item **res) {
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for (; args; args = args->next) {
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struct item *evaluated = NULL;
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if (!execute_statement (ctx, arg, &evaluated))
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if (!execute_statement (ctx, args, &evaluated))
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return false;
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if (evaluated) {
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item_free_list (evaluated->next);
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evaluated->next = NULL;
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*res = evaluated;
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res = &evaluated->next;
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res = &(*res = evaluated)->next;
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}
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}
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return true;
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}
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static bool
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execute_native (struct context *ctx,
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struct native_fn *fn, struct item *next, struct item **res) {
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struct item *args = NULL;
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bool ok = execute_args_list (ctx, next, &args)
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&& fn->handler (ctx, args, res);
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item_free_list (args);
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return ok;
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}
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// TODO: we should probably maintain arguments in a separate list,
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// either that or at least remember the count so that we can reset them
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static bool
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execute_args (struct context *ctx, struct item *next) {
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execute_args_and_set (struct context *ctx, struct item *following) {
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struct item *args = NULL;
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if (!execute_args_list (ctx, next, &args)) {
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if (!execute_args (ctx, following, &args)) {
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item_free_list (args);
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return false;
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}
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char buf[64];
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size_t i = 0;
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for (struct item *arg = args; arg; arg = arg->next) {
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char buf[64];
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(void) snprintf (buf, sizeof buf, "%zu", i++);
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if (!set (ctx, buf, arg))
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return false;
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@ -817,15 +792,21 @@ execute_args (struct context *ctx, struct item *next) {
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return true;
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}
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static bool
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execute_native (struct context *ctx,
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struct native_fn *fn, struct item *next, struct item **res) {
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struct item *args = NULL;
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bool ok = execute_args (ctx, next, &args)
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&& fn->handler (ctx, args, res);
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item_free_list (args);
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return ok;
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}
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static bool
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execute_statement
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(struct context *ctx, struct item *statement, struct item **result) {
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if (statement->type == ITEM_STRING) {
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if ((*result = new_clone (statement)))
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return true;
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ctx->memory_failure = true;
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return false;
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}
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if (statement->type == ITEM_STRING)
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return check (ctx, (*result = new_clone (statement)));
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// XXX: should this ever happen and what are the consequences?
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// Shouldn't we rather clone the empty list?
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@ -838,12 +819,10 @@ execute_statement
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if (body->type == ITEM_STRING) {
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name = body->value;
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// TODO: these could be just regular handlers, only top priority
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if (!strcmp (name, "quote")) {
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if (!following || (*result = new_clone_list (following)))
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return true;
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ctx->memory_failure = true;
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return false;
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}
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// TODO: these should also get a stack trace the normal way
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if (!strcmp (name, "quote"))
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return !following
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|| check (ctx, (*result = new_clone_list (following)));
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if (!strcmp (name, "arg"))
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return rename_arguments (ctx, following);
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body = get (ctx, name);
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@ -857,23 +836,21 @@ execute_statement
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return true;
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} else if (body->type == ITEM_STRING) {
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// Recursion could be pretty fatal, let's not do that
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if ((*result = new_clone (body)))
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if (check (ctx, (*result = new_clone (body))))
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return true;
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ctx->memory_failure = true;
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} else {
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if (execute_args (ctx, following)
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if (execute_args_and_set (ctx, following)
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&& execute (ctx, body->head, result))
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return true;
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}
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// In this case, `error' is NULL
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if (ctx->memory_failure)
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return false;
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// This creates some form of a stack trace
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char *tmp = ctx->error;
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set_error (ctx, "%s -> %s", name, tmp);
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free (tmp);
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// In that case, `error' is NULL and there's nothing else to do anyway
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if (!ctx->memory_failure) {
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// This creates some form of a stack trace
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char *tmp = ctx->error;
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set_error (ctx, "%s -> %s", name, tmp);
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free (tmp);
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}
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return false;
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}
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@ -925,56 +902,59 @@ init_runtime_library_scripts (struct context *ctx) {
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defn (fn_set) {
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struct item *name = args;
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if (!name || name->type != ITEM_STRING)
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return (void *) set_error (ctx, "first argument must be string");
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return set_error (ctx, "first argument must be string");
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struct item *value;
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if ((value = name->next))
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return set (ctx, name->value, value);
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// FIXME: how do we represent a nil value here?
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*result = new_clone (get (ctx, name->value));
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return true;
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return check (ctx, (*result = new_clone (get (ctx, name->value))));
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}
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defn (fn_list) {
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struct item *values = NULL;
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if (args && !check (ctx, (values = new_clone_list (args))))
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return false;
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return check (ctx, (*result = new_list (values)));
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}
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defn (fn_print) {
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(void) result;
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// TODO: error on list
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struct buffer buf = BUFFER_INITIALIZER;
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for (; args; args = args->next)
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buffer_append (&buf, args->value, args->len);
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buffer_append_c (&buf, '\0');
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if (buf.memory_failure) {
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ctx->memory_failure = true;
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return false;
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for (; args; args = args->next) {
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if (args->type != ITEM_STRING)
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// TODO: print lists as their parsable representation
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return set_error (ctx, "cannot print lists");
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if (fwrite (args->value, 1, args->len, stdout) != args->len)
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return set_error (ctx, "write failed: %s", strerror (errno));
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}
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printf ("%s", buf.s);
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free (buf.s);
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return true;
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}
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defn (fn_concatenate) {
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// TODO: error on list
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struct buffer buf = BUFFER_INITIALIZER;
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for (; args; args = args->next)
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for (; args; args = args->next) {
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if (args->type != ITEM_STRING) {
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free (buf.s);
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return set_error (ctx, "cannot concatenate lists");
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}
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buffer_append (&buf, args->value, args->len);
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buffer_append_c (&buf, '\0');
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if (buf.memory_failure) {
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ctx->memory_failure = true;
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return false;
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}
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*result = new_string (buf.s, buf.len);
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buffer_append_c (&buf, '\0');
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bool ok = !(ctx->memory_failure = buf.memory_failure)
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&& check (ctx, (*result = new_string (buf.s, buf.len)));
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free (buf.s);
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return true;
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return ok;
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}
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static bool
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init_runtime_library (void)
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{
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return native_register ("..", fn_concatenate)
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&& native_register ("set", fn_set)
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&& native_register ("print", fn_print);
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return native_register ("set", fn_set)
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&& native_register ("list", fn_list)
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&& native_register ("print", fn_print)
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&& native_register ("..", fn_concatenate);
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}
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static void
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@ -1008,7 +988,6 @@ main (int argc, char *argv[]) {
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const char *e = NULL;
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struct item *program = parser_run (&parser, &e);
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free (buf.s);
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if (e) {
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printf ("%s: %s\n", "parse error", e);
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return 1;
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