static int
_parser_active_list_contains (glcpp_parser_t *parser, const char *identifier);
+typedef enum {
+ EXPANSION_MODE_IGNORE_DEFINED,
+ EXPANSION_MODE_EVALUATE_DEFINED
+} expansion_mode_t;
+
/* Expand list, and begin lexing from the result (after first
* prefixing a token of type 'head_token_type').
*/
static void
_glcpp_parser_expand_and_lex_from (glcpp_parser_t *parser,
int head_token_type,
- token_list_t *list);
+ token_list_t *list,
+ expansion_mode_t mode);
/* Perform macro expansion in-place on the given list. */
static void
_glcpp_parser_expand_token_list (glcpp_parser_t *parser,
- token_list_t *list);
+ token_list_t *list,
+ expansion_mode_t mode);
static void
_glcpp_parser_print_expanded_token_list (glcpp_parser_t *parser,
%type <expression_value> expression
%type <str> IDENTIFIER FUNC_IDENTIFIER OBJ_IDENTIFIER INTEGER_STRING OTHER ERROR_TOKEN PRAGMA
%type <string_list> identifier_list
-%type <token> preprocessing_token conditional_token
-%type <token_list> pp_tokens replacement_list text_line conditional_tokens
+%type <token> preprocessing_token
+%type <token_list> pp_tokens replacement_list text_line
%left OR
%left AND
%left '|'
parser->skip_stack->type == SKIP_NO_SKIP)
{
_glcpp_parser_expand_and_lex_from (parser,
- LINE_EXPANDED, $4);
+ LINE_EXPANDED, $4,
+ EXPANSION_MODE_IGNORE_DEFINED);
}
}
;
}
| HASH_TOKEN IF {
glcpp_parser_resolve_implicit_version(parser);
- } conditional_tokens NEWLINE {
+ } pp_tokens NEWLINE {
/* Be careful to only evaluate the 'if' expression if
* we are not skipping. When we are skipping, we
* simply push a new 0-valued 'if' onto the skip
parser->skip_stack->type == SKIP_NO_SKIP)
{
_glcpp_parser_expand_and_lex_from (parser,
- IF_EXPANDED, $4);
+ IF_EXPANDED, $4,
+ EXPANSION_MODE_EVALUATE_DEFINED);
}
else
{
ralloc_free ($4);
_glcpp_parser_skip_stack_push_if (parser, & @3, macro == NULL);
}
-| HASH_TOKEN ELIF conditional_tokens NEWLINE {
+| HASH_TOKEN ELIF pp_tokens NEWLINE {
/* Be careful to only evaluate the 'elif' expression
* if we are not skipping. When we are skipping, we
* simply change to a 0-valued 'elif' on the skip
parser->skip_stack->type == SKIP_TO_ELSE)
{
_glcpp_parser_expand_and_lex_from (parser,
- ELIF_EXPANDED, $3);
+ ELIF_EXPANDED, $3,
+ EXPANSION_MODE_EVALUATE_DEFINED);
}
else if (parser->skip_stack &&
parser->skip_stack->has_else)
}
;
-conditional_token:
- /* Handle "defined" operator */
- DEFINED IDENTIFIER {
- int v = hash_table_find (parser->defines, $2) ? 1 : 0;
- $$ = _token_create_ival (parser, INTEGER, v);
- }
-| DEFINED '(' IDENTIFIER ')' {
- int v = hash_table_find (parser->defines, $3) ? 1 : 0;
- $$ = _token_create_ival (parser, INTEGER, v);
- }
-| preprocessing_token
-;
-
-conditional_tokens:
- /* Exactly the same as pp_tokens, but using conditional_token */
- conditional_token {
- $$ = _token_list_create (parser);
- _token_list_append ($$, $1);
- }
-| conditional_tokens conditional_token {
- $$ = $1;
- _token_list_append ($$, $2);
- }
-;
-
pp_tokens:
preprocessing_token {
parser->space_tokens = 1;
$$ = _token_create_ival (parser, $1, $1);
$$->location = yylloc;
}
+| DEFINED {
+ $$ = _token_create_ival (parser, DEFINED, DEFINED);
+ $$->location = yylloc;
+ }
| OTHER {
$$ = _token_create_str (parser, OTHER, $1);
$$->location = yylloc;
case COMMA_FINAL:
ralloc_asprintf_rewrite_tail (out, len, ",");
break;
+ case DEFINED:
+ ralloc_asprintf_rewrite_tail (out, len, "defined");
+ break;
case PLACEHOLDER:
/* Nothing to print. */
break;
default:
assert(!"Error: Don't know how to print token.");
+
break;
}
}
return _token_list_create_with_one_ival (ctx, INTEGER, ival);
}
+/* Evaluate a DEFINED token node (based on subsequent tokens in the list).
+ *
+ * Note: This function must only be called when "node" is a DEFINED token,
+ * (and will abort with an assertion failure otherwise).
+ *
+ * If "node" is followed, (ignoring any SPACE tokens), by an IDENTIFIER token
+ * (optionally preceded and followed by '(' and ')' tokens) then the following
+ * occurs:
+ *
+ * If the identifier is a defined macro, this function returns 1.
+ *
+ * If the identifier is not a defined macro, this function returns 0.
+ *
+ * In either case, *last will be updated to the last node in the list
+ * consumed by the evaluation, (either the token of the identifier or the
+ * token of the closing parenthesis).
+ *
+ * In all other cases, (such as "node is the final node of the list", or
+ * "missing closing parenthesis", etc.), this function generates a
+ * preprocessor error, returns -1 and *last will not be set.
+ */
+static int
+_glcpp_parser_evaluate_defined (glcpp_parser_t *parser,
+ token_node_t *node,
+ token_node_t **last)
+{
+ token_node_t *argument, *defined = node;
+
+ assert (node->token->type == DEFINED);
+
+ node = node->next;
+
+ /* Ignore whitespace after DEFINED token. */
+ while (node && node->token->type == SPACE)
+ node = node->next;
+
+ if (node == NULL)
+ goto FAIL;
+
+ if (node->token->type == IDENTIFIER || node->token->type == OTHER) {
+ argument = node;
+ } else if (node->token->type == '(') {
+ node = node->next;
+
+ /* Ignore whitespace after '(' token. */
+ while (node && node->token->type == SPACE)
+ node = node->next;
+
+ if (node == NULL || (node->token->type != IDENTIFIER &&
+ node->token->type != OTHER))
+ {
+ goto FAIL;
+ }
+
+ argument = node;
+
+ node = node->next;
+
+ /* Ignore whitespace after identifier, before ')' token. */
+ while (node && node->token->type == SPACE)
+ node = node->next;
+
+ if (node == NULL || node->token->type != ')')
+ goto FAIL;
+ } else {
+ goto FAIL;
+ }
+
+ *last = node;
+
+ return hash_table_find (parser->defines,
+ argument->token->value.str) ? 1 : 0;
+
+FAIL:
+ glcpp_error (&defined->token->location, parser,
+ "\"defined\" not followed by an identifier");
+ return -1;
+}
+
+/* Evaluate all DEFINED nodes in a given list, modifying the list in place.
+ */
+static void
+_glcpp_parser_evaluate_defined_in_list (glcpp_parser_t *parser,
+ token_list_t *list)
+{
+ token_node_t *node, *node_prev, *replacement, *last = NULL;
+ int value;
+
+ if (list == NULL)
+ return;
+
+ node_prev = NULL;
+ node = list->head;
+
+ while (node) {
+
+ if (node->token->type != DEFINED)
+ goto NEXT;
+
+ value = _glcpp_parser_evaluate_defined (parser, node, &last);
+ if (value == -1)
+ goto NEXT;
+
+ replacement = ralloc (list, token_node_t);
+ replacement->token = _token_create_ival (list, INTEGER, value);
+
+ /* Splice replacement node into list, replacing from "node"
+ * through "last". */
+ if (node_prev)
+ node_prev->next = replacement;
+ else
+ list->head = replacement;
+ replacement->next = last->next;
+ if (last == list->tail)
+ list->tail = replacement;
+
+ node = replacement;
+
+ NEXT:
+ node_prev = node;
+ node = node->next;
+ }
+}
+
/* Perform macro expansion on 'list', placing the resulting tokens
* into a new list which is initialized with a first token of type
* 'head_token_type'. Then begin lexing from the resulting list,
* (return to the current lexing source when this list is exhausted).
+ *
+ * See the documentation of _glcpp_parser_expand_token_list for a description
+ * of the "mode" parameter.
*/
static void
_glcpp_parser_expand_and_lex_from (glcpp_parser_t *parser,
int head_token_type,
- token_list_t *list)
+ token_list_t *list,
+ expansion_mode_t mode)
{
token_list_t *expanded;
token_t *token;
expanded = _token_list_create (parser);
token = _token_create_ival (parser, head_token_type, head_token_type);
_token_list_append (expanded, token);
- _glcpp_parser_expand_token_list (parser, list);
+ _glcpp_parser_expand_token_list (parser, list, mode);
_token_list_append_list (expanded, list);
glcpp_parser_lex_from (parser, expanded);
}
* *last to the last node in the list that was consumed by the
* expansion. Specifically, *last will be set as follows: as the
* token of the closing right parenthesis.
+ *
+ * See the documentation of _glcpp_parser_expand_token_list for a description
+ * of the "mode" parameter.
*/
static token_list_t *
_glcpp_parser_expand_function (glcpp_parser_t *parser,
token_node_t *node,
- token_node_t **last)
-
+ token_node_t **last,
+ expansion_mode_t mode)
{
macro_t *macro;
const char *identifier;
expanded_argument = _token_list_copy (parser,
argument);
_glcpp_parser_expand_token_list (parser,
- expanded_argument);
+ expanded_argument,
+ mode);
_token_list_append_list (substituted,
expanded_argument);
} else {
*
* As the token of the closing right parenthesis in the case of
* function-like macro expansion.
+ *
+ * See the documentation of _glcpp_parser_expand_token_list for a description
+ * of the "mode" parameter.
*/
static token_list_t *
_glcpp_parser_expand_node (glcpp_parser_t *parser,
token_node_t *node,
- token_node_t **last)
+ token_node_t **last,
+ expansion_mode_t mode)
{
token_t *token = node->token;
const char *identifier;
return replacement;
}
- return _glcpp_parser_expand_function (parser, node, last);
+ return _glcpp_parser_expand_function (parser, node, last, mode);
}
/* Push a new identifier onto the parser's active list.
/* Walk over the token list replacing nodes with their expansion.
* Whenever nodes are expanded the walking will walk over the new
* nodes, continuing to expand as necessary. The results are placed in
- * 'list' itself;
+ * 'list' itself.
+ *
+ * The "mode" argument controls the handling of any DEFINED tokens that
+ * result from expansion as follows:
+ *
+ * EXPANSION_MODE_IGNORE_DEFINED: Any resulting DEFINED tokens will be
+ * left in the final list, unevaluated. This is the correct mode
+ * for expanding any list in any context other than a
+ * preprocessor conditional, (#if or #elif).
+ *
+ * EXPANSION_MODE_EVALUATE_DEFINED: Any resulting DEFINED tokens will be
+ * evaluated to 0 or 1 tokens depending on whether the following
+ * token is the name of a defined macro. If the DEFINED token is
+ * not followed by an (optionally parenthesized) identifier, then
+ * an error will be generated. This the correct mode for
+ * expanding any list in the context of a preprocessor
+ * conditional, (#if or #elif).
*/
static void
_glcpp_parser_expand_token_list (glcpp_parser_t *parser,
- token_list_t *list)
+ token_list_t *list,
+ expansion_mode_t mode)
{
token_node_t *node_prev;
token_node_t *node, *last = NULL;
node_prev = NULL;
node = list->head;
+ if (mode == EXPANSION_MODE_EVALUATE_DEFINED)
+ _glcpp_parser_evaluate_defined_in_list (parser, list);
+
while (node) {
while (parser->active && parser->active->marker == node)
_parser_active_list_pop (parser);
- expansion = _glcpp_parser_expand_node (parser, node, &last);
+ expansion = _glcpp_parser_expand_node (parser, node, &last, mode);
if (expansion) {
token_node_t *n;
+ if (mode == EXPANSION_MODE_EVALUATE_DEFINED) {
+ _glcpp_parser_evaluate_defined_in_list (parser,
+ expansion);
+ }
+
for (n = node; n != last->next; n = n->next)
while (parser->active &&
parser->active->marker == n)
if (list == NULL)
return;
- _glcpp_parser_expand_token_list (parser, list);
+ _glcpp_parser_expand_token_list (parser, list, EXPANSION_MODE_IGNORE_DEFINED);
_token_list_trim_trailing_space (list);
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