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'noreturn' is - for now - a keyword, and used just like noref/var/const, to mark a function as not-returning

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This commit is contained in:
Wolfgang (Blub) Bumiller 2012-12-19 20:54:54 +01:00
parent c8e163b0df
commit 664b6d6604
2 changed files with 29 additions and 20 deletions
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2
lexer.c
View file

@ -50,6 +50,8 @@ static const char *keywords_fg[] = {
"typedef",
"goto",
"noreturn",
"__builtin_debug_printtype"
};
static size_t num_keywords_fg = sizeof(keywords_fg) / sizeof(keywords_fg[0]);

39
parser.c
View file

@ -104,7 +104,7 @@ static void parser_enterblock(parser_t *parser);
static bool parser_leaveblock(parser_t *parser);
static void parser_addlocal(parser_t *parser, const char *name, ast_expression *e);
static bool parse_typedef(parser_t *parser);
static bool parse_variable(parser_t *parser, ast_block *localblock, bool nofields, int qualifier, ast_value *cached_typedef, bool noref);
static bool parse_variable(parser_t *parser, ast_block *localblock, bool nofields, int qualifier, ast_value *cached_typedef, bool noref, bool noreturn);
static ast_block* parse_block(parser_t *parser);
static bool parse_block_into(parser_t *parser, ast_block *block);
static bool parse_statement_or_block(parser_t *parser, ast_expression **out);
@ -2057,7 +2057,7 @@ static bool parse_for(parser_t *parser, ast_block *block, ast_expression **out)
"current standard does not allow variable declarations in for-loop initializers"))
goto onerr;
}
if (!parse_variable(parser, block, true, CV_VAR, typevar, false))
if (!parse_variable(parser, block, true, CV_VAR, typevar, false, false))
goto onerr;
}
else if (parser->tok != ';')
@ -2197,11 +2197,12 @@ static bool parse_break_continue(parser_t *parser, ast_block *block, ast_express
/* returns true when it was a variable qualifier, false otherwise!
* on error, cvq is set to CV_WRONG
*/
static bool parse_var_qualifiers(parser_t *parser, bool with_local, int *cvq, bool *noref)
static bool parse_var_qualifiers(parser_t *parser, bool with_local, int *cvq, bool *noref, bool *noreturn)
{
bool had_const = false;
bool had_var = false;
bool had_noref = false;
bool had_noreturn = false;
for (;;) {
if (!strcmp(parser_tokval(parser), "const"))
@ -2212,7 +2213,9 @@ static bool parse_var_qualifiers(parser_t *parser, bool with_local, int *cvq, bo
had_var = true;
else if (!strcmp(parser_tokval(parser), "noref"))
had_noref = true;
else if (!had_const && !had_var && !had_noref) {
else if (!strcmp(parser_tokval(parser), "noreturn"))
had_noreturn = true;
else if (!had_const && !had_var && !had_noref && !had_noreturn) {
return false;
}
else
@ -2227,6 +2230,7 @@ static bool parse_var_qualifiers(parser_t *parser, bool with_local, int *cvq, bo
else
*cvq = CV_NONE;
*noref = had_noref;
*noreturn = had_noreturn;
return true;
onerr:
parseerror(parser, "parse error after variable qualifier");
@ -2243,7 +2247,7 @@ static bool parse_switch(parser_t *parser, ast_block *block, ast_expression **ou
ast_switch_case swcase;
int cvq;
bool noref;
bool noref, noreturn;
lex_ctx ctx = parser_ctx(parser);
@ -2295,19 +2299,19 @@ static bool parse_switch(parser_t *parser, ast_block *block, ast_expression **ou
if (parser->tok == TOKEN_IDENT)
typevar = parser_find_typedef(parser, parser_tokval(parser), 0);
if (typevar || parser->tok == TOKEN_TYPENAME) {
if (!parse_variable(parser, block, false, CV_NONE, typevar, false)) {
if (!parse_variable(parser, block, false, CV_NONE, typevar, false, false)) {
ast_delete(switchnode);
return false;
}
continue;
}
if (parse_var_qualifiers(parser, true, &cvq, &noref))
if (parse_var_qualifiers(parser, true, &cvq, &noref, &noreturn))
{
if (cvq == CV_WRONG) {
ast_delete(switchnode);
return false;
}
if (!parse_variable(parser, block, false, cvq, NULL, noref)) {
if (!parse_variable(parser, block, false, cvq, NULL, noref, noreturn)) {
ast_delete(switchnode);
return false;
}
@ -2522,7 +2526,7 @@ static bool parse_pragma(parser_t *parser)
static bool parse_statement(parser_t *parser, ast_block *block, ast_expression **out, bool allow_cases)
{
bool noref;
bool noref, noreturn;
int cvq = CV_NONE;
ast_value *typevar = NULL;
@ -2542,15 +2546,15 @@ static bool parse_statement(parser_t *parser, ast_block *block, ast_expression *
if (parsewarning(parser, WARN_EXTENSIONS, "missing 'local' keyword when declaring a local variable"))
return false;
}
if (!parse_variable(parser, block, false, CV_NONE, typevar, false))
if (!parse_variable(parser, block, false, CV_NONE, typevar, false, false))
return false;
return true;
}
else if (parse_var_qualifiers(parser, !!block, &cvq, &noref))
else if (parse_var_qualifiers(parser, !!block, &cvq, &noref, &noreturn))
{
if (cvq == CV_WRONG)
return false;
return parse_variable(parser, block, true, cvq, NULL, noref);
return parse_variable(parser, block, true, cvq, NULL, noref, noreturn);
}
else if (parser->tok == TOKEN_KEYWORD)
{
@ -3806,7 +3810,7 @@ static bool parse_typedef(parser_t *parser)
return true;
}
static bool parse_variable(parser_t *parser, ast_block *localblock, bool nofields, int qualifier, ast_value *cached_typedef, bool noref)
static bool parse_variable(parser_t *parser, ast_block *localblock, bool nofields, int qualifier, ast_value *cached_typedef, bool noref, bool noreturn)
{
ast_value *var;
ast_value *proto;
@ -3873,6 +3877,8 @@ static bool parse_variable(parser_t *parser, ast_block *localblock, bool nofield
/* in a noref section we simply bump the usecount */
if (noref || parser->noref)
var->uses++;
if (noreturn)
var->expression.flags |= AST_FLAG_NORETURN;
/* Part 1:
* check for validity: (end_sys_..., multiple-definitions, prototypes, ...)
@ -4340,6 +4346,7 @@ static bool parser_global_statement(parser_t *parser)
{
int cvq = CV_WRONG;
bool noref = false;
bool noreturn = false;
ast_value *istype = NULL;
if (parser->tok == TOKEN_IDENT)
@ -4347,13 +4354,13 @@ static bool parser_global_statement(parser_t *parser)
if (istype || parser->tok == TOKEN_TYPENAME || parser->tok == '.')
{
return parse_variable(parser, NULL, false, CV_NONE, istype, false);
return parse_variable(parser, NULL, false, CV_NONE, istype, false, false);
}
else if (parse_var_qualifiers(parser, false, &cvq, &noref))
else if (parse_var_qualifiers(parser, false, &cvq, &noref, &noreturn))
{
if (cvq == CV_WRONG)
return false;
return parse_variable(parser, NULL, true, cvq, NULL, noref);
return parse_variable(parser, NULL, true, cvq, NULL, noref, noreturn);
}
else if (parser->tok == TOKEN_KEYWORD)
{