2 * Stupid C parser, version 1e-6.
4 * Let's see how hard this is to do.
6 * Copyright (C) 2003 Transmeta Corp.
9 * Licensed under the Open Software License version 1.1
25 #include "expression.h"
28 static struct symbol_list
**function_symbol_list
;
30 // Add a symbol to the list of function-local symbols
31 #define fn_local_symbol(x) add_symbol(function_symbol_list, (x))
33 static struct token
*statement(struct token
*token
, struct statement
**tree
);
34 static struct token
*external_declaration(struct token
*token
, struct symbol_list
**list
);
36 struct statement
*alloc_statement(struct position pos
, int type
)
38 struct statement
*stmt
= __alloc_statement(0);
44 static struct token
*struct_declaration_list(struct token
*token
, struct symbol_list
**list
);
46 static struct symbol
* indirect(struct position pos
, struct ctype
*ctype
, int type
)
48 struct symbol
*sym
= alloc_symbol(pos
, type
);
50 sym
->ctype
.base_type
= ctype
->base_type
;
51 sym
->ctype
.modifiers
= ctype
->modifiers
& ~MOD_STORAGE
;
53 ctype
->base_type
= sym
;
54 ctype
->modifiers
&= MOD_STORAGE
;
58 static struct symbol
*lookup_or_create_symbol(enum namespace ns
, enum type type
, struct token
*token
)
60 struct symbol
*sym
= lookup_symbol(token
->ident
, ns
);
62 sym
= alloc_symbol(token
->pos
, type
);
63 sym
->ident
= token
->ident
;
64 bind_symbol(sym
, token
->ident
, ns
);
65 if (type
== SYM_LABEL
)
72 * NOTE! NS_LABEL is not just a different namespace,
73 * it also ends up using function scope instead of the
74 * regular symbol scope.
76 struct symbol
*label_symbol(struct token
*token
)
78 return lookup_or_create_symbol(NS_LABEL
, SYM_LABEL
, token
);
81 struct token
*struct_union_enum_specifier(enum namespace ns
, enum type type
,
82 struct token
*token
, struct ctype
*ctype
,
83 struct token
*(*parse
)(struct token
*, struct symbol
*))
88 if (token_type(token
) == TOKEN_IDENT
) {
89 sym
= lookup_or_create_symbol(ns
, type
, token
);
91 ctype
->base_type
= sym
;
92 if (match_op(token
, '{')) {
93 token
= parse(token
->next
, sym
);
94 token
= expect(token
, '}', "at end of struct-union-enum-specifier");
99 // private struct/union/enum type
100 if (!match_op(token
, '{')) {
101 warn(token
->pos
, "expected declaration");
102 ctype
->base_type
= &bad_type
;
106 sym
= alloc_symbol(token
->pos
, type
);
107 token
= parse(token
->next
, sym
);
108 ctype
->base_type
= sym
;
109 return expect(token
, '}', "at end of specifier");
112 static struct token
*parse_struct_declaration(struct token
*token
, struct symbol
*sym
)
114 return struct_declaration_list(token
, &sym
->symbol_list
);
117 struct token
*struct_or_union_specifier(enum type type
, struct token
*token
, struct ctype
*ctype
)
119 return struct_union_enum_specifier(NS_STRUCT
, type
, token
, ctype
, parse_struct_declaration
);
122 static struct token
*parse_enum_declaration(struct token
*token
, struct symbol
*parent
)
125 while (token_type(token
) == TOKEN_IDENT
) {
126 struct token
*next
= token
->next
;
129 sym
= alloc_symbol(token
->pos
, SYM_ENUM
);
130 bind_symbol(sym
, token
->ident
, NS_SYMBOL
);
131 sym
->ctype
.base_type
= parent
;
133 if (match_op(next
, '=')) {
134 struct expression
*expr
;
135 next
= constant_expression(next
->next
, &expr
);
136 nextval
= get_expression_value(expr
);
138 sym
->value
= nextval
;
141 if (!match_op(token
, ','))
144 nextval
= nextval
+ 1;
149 struct token
*enum_specifier(struct token
*token
, struct ctype
*ctype
)
151 return struct_union_enum_specifier(NS_ENUM
, SYM_ENUM
, token
, ctype
, parse_enum_declaration
);
154 struct token
*typeof_specifier(struct token
*token
, struct ctype
*ctype
)
158 if (!match_op(token
, '(')) {
159 warn(token
->pos
, "expected '(' after typeof");
162 if (lookup_type(token
->next
)) {
163 token
= typename(token
->next
, &sym
);
166 struct symbol
*typeof_sym
= alloc_symbol(token
->pos
, SYM_TYPEOF
);
167 token
= parse_expression(token
->next
, &typeof_sym
->initializer
);
169 ctype
->modifiers
= 0;
170 ctype
->base_type
= typeof_sym
;
172 return expect(token
, ')', "after typeof");
175 static const char * handle_attribute(struct ctype
*ctype
, struct ident
*attribute
, struct expression
*expr
)
177 if (match_string_ident(attribute
, "packed") ||
178 match_string_ident(attribute
, "__packed__")) {
179 ctype
->alignment
= 1;
182 if (match_string_ident(attribute
, "aligned") ||
183 match_string_ident(attribute
, "__aligned__")) {
184 int alignment
= MAX_ALIGNMENT
;
186 alignment
= get_expression_value(expr
);
187 ctype
->alignment
= alignment
;
190 if (match_string_ident(attribute
, "nocast")) {
191 ctype
->modifiers
|= MOD_NOCAST
;
194 if (match_string_ident(attribute
, "noderef")) {
195 ctype
->modifiers
|= MOD_NODEREF
;
198 if (match_string_ident(attribute
, "address_space")) {
200 return "expected address space number";
201 ctype
->as
= get_expression_value(expr
);
204 if (match_string_ident(attribute
, "context")) {
205 if (expr
->type
== EXPR_COMMA
) {
206 int mask
= get_expression_value(expr
->left
);
207 int value
= get_expression_value(expr
->right
);
209 return "nonsense attribute types";
210 ctype
->contextmask
|= mask
;
211 ctype
->context
|= value
;
214 return "expected context mask and value";
217 /* Throw away for now.. */
218 if (match_string_ident(attribute
, "format") ||
219 match_string_ident(attribute
, "__format__"))
221 if (match_string_ident(attribute
, "section") ||
222 match_string_ident(attribute
, "__section__"))
224 if (match_string_ident(attribute
, "unused") ||
225 match_string_ident(attribute
, "__unused__"))
227 if (match_string_ident(attribute
, "const") ||
228 match_string_ident(attribute
, "__const__"))
230 if (match_string_ident(attribute
, "noreturn"))
232 if (match_string_ident(attribute
, "regparm"))
234 if (match_string_ident(attribute
, "weak"))
237 return "unknown attribute";
240 struct token
*attribute_specifier(struct token
*token
, struct ctype
*ctype
)
242 ctype
->modifiers
= 0;
243 token
= expect(token
, '(', "after attribute");
244 token
= expect(token
, '(', "after attribute");
248 struct ident
*attribute_name
;
249 struct expression
*attribute_expr
;
251 if (eof_token(token
))
253 if (match_op(token
, ';'))
255 if (token_type(token
) != TOKEN_IDENT
)
257 attribute_name
= token
->ident
;
259 attribute_expr
= NULL
;
260 if (match_op(token
, '('))
261 token
= parens_expression(token
, &attribute_expr
, "in attribute");
262 error
= handle_attribute(ctype
, attribute_name
, attribute_expr
);
264 warn(token
->pos
, "attribute '%s': %s", show_ident(attribute_name
), error
);
265 if (!match_op(token
, ','))
270 token
= expect(token
, ')', "after attribute");
271 token
= expect(token
, ')', "after attribute");
275 #define MOD_SPECIALBITS (MOD_STRUCTOF | MOD_UNIONOF | MOD_ENUMOF | MOD_ATTRIBUTE | MOD_TYPEOF)
276 #define MOD_SPECIFIER (MOD_CHAR | MOD_SHORT | MOD_LONG | MOD_LONGLONG | MOD_SIGNED | MOD_UNSIGNED)
278 struct symbol
* ctype_integer(unsigned int spec
)
280 static struct symbol
*const integer_ctypes
[][2] = {
281 { &llong_ctype
, &ullong_ctype
},
282 { &long_ctype
, &ulong_ctype
},
283 { &short_ctype
, &ushort_ctype
},
284 { &char_ctype
, &uchar_ctype
},
285 { &int_ctype
, &uint_ctype
},
287 struct symbol
*const (*ctype
)[2];
289 ctype
= integer_ctypes
;
290 if (!(spec
& MOD_LONGLONG
)) {
292 if (!(spec
& MOD_LONG
)) {
294 if (!(spec
& MOD_SHORT
)) {
296 if (!(spec
& MOD_CHAR
))
301 return ctype
[0][(spec
& MOD_UNSIGNED
) != 0];
304 struct symbol
* ctype_fp(unsigned int spec
)
306 if (spec
& MOD_LONGLONG
)
307 return &ldouble_ctype
;
309 return &double_ctype
;
313 static void apply_ctype(struct position pos
, struct ctype
*thistype
, struct ctype
*ctype
)
315 unsigned long mod
= thistype
->modifiers
;
318 unsigned long old
= ctype
->modifiers
;
319 unsigned long extra
= 0, dup
;
321 if (mod
& old
& MOD_LONG
) {
322 extra
= MOD_LONGLONG
| MOD_LONG
;
326 dup
= (mod
& old
) | (extra
& old
) | (extra
& mod
);
328 warn(pos
, "Just how %sdo you want this type to be?",
329 modifier_string(dup
));
330 ctype
->modifiers
= old
| mod
| extra
;
333 /* Context mask and value */
334 if ((ctype
->context
^ thistype
->context
) & (ctype
->contextmask
& thistype
->contextmask
)) {
335 warn(pos
, "inconsistend attribute types");
336 thistype
->context
= 0;
337 thistype
->contextmask
= 0;
339 ctype
->context
|= thistype
->context
;
340 ctype
->contextmask
|= thistype
->contextmask
;
343 if (thistype
->alignment
& (thistype
->alignment
-1)) {
344 warn(pos
, "I don't like non-power-of-2 alignments");
345 thistype
->alignment
= 0;
347 if (thistype
->alignment
> ctype
->alignment
)
348 ctype
->alignment
= thistype
->alignment
;
351 ctype
->as
= thistype
->as
;
355 static struct token
*declaration_specifiers(struct token
*next
, struct ctype
*ctype
, int qual
)
359 while ( (token
= next
) != NULL
) {
360 struct ctype thistype
;
362 struct symbol
*s
, *type
;
366 if (token_type(token
) != TOKEN_IDENT
)
368 ident
= token
->ident
;
370 s
= lookup_symbol(ident
, NS_TYPEDEF
);
374 mod
= thistype
.modifiers
;
375 if (qual
&& (mod
& ~(MOD_ATTRIBUTE
| MOD_CONST
| MOD_VOLATILE
)))
377 if (mod
& MOD_SPECIALBITS
) {
378 if (mod
& MOD_STRUCTOF
)
379 next
= struct_or_union_specifier(SYM_STRUCT
, next
, &thistype
);
380 else if (mod
& MOD_UNIONOF
)
381 next
= struct_or_union_specifier(SYM_UNION
, next
, &thistype
);
382 else if (mod
& MOD_ENUMOF
)
383 next
= enum_specifier(next
, &thistype
);
384 else if (mod
& MOD_ATTRIBUTE
)
385 next
= attribute_specifier(next
, &thistype
);
386 else if (mod
& MOD_TYPEOF
)
387 next
= typeof_specifier(next
, &thistype
);
388 mod
= thistype
.modifiers
;
390 type
= thistype
.base_type
;
394 if (type
!= ctype
->base_type
) {
395 if (ctype
->base_type
)
397 ctype
->base_type
= type
;
401 apply_ctype(token
->pos
, &thistype
, ctype
);
404 /* Turn the "virtual types" into real types with real sizes etc */
405 if (!ctype
->base_type
&& (ctype
->modifiers
& MOD_SPECIFIER
))
406 ctype
->base_type
= &int_type
;
408 if (ctype
->base_type
== &int_type
) {
409 ctype
->base_type
= ctype_integer(ctype
->modifiers
& MOD_SPECIFIER
);
410 ctype
->modifiers
&= ~MOD_SPECIFIER
;
413 if (ctype
->base_type
== &fp_type
) {
414 ctype
->base_type
= ctype_fp(ctype
->modifiers
& MOD_SPECIFIER
);
415 ctype
->modifiers
&= ~MOD_SPECIFIER
;
421 static struct token
*abstract_array_declarator(struct token
*token
, struct symbol
*sym
)
423 struct expression
*expr
= NULL
;
425 token
= parse_expression(token
, &expr
);
426 sym
->array_size
= expr
;
430 static struct token
*parameter_type_list(struct token
*, struct symbol
*);
431 static struct token
*declarator(struct token
*token
, struct symbol
**tree
, struct ident
**p
);
433 static struct token
*direct_declarator(struct token
*token
, struct symbol
**tree
, struct ident
**p
)
435 struct ctype
*ctype
= &(*tree
)->ctype
;
437 if (p
&& token_type(token
) == TOKEN_IDENT
) {
443 if (match_ident(token
, &__attribute___ident
) || match_ident(token
, &__attribute_ident
)) {
444 struct ctype thistype
= { 0, };
445 token
= attribute_specifier(token
->next
, &thistype
);
446 apply_ctype(token
->pos
, &thistype
, ctype
);
449 if (token_type(token
) != TOKEN_SPECIAL
)
453 * This can be either a parameter list or a grouping.
454 * For the direct (non-abstract) case, we know if must be
455 * a paramter list if we already saw the identifier.
456 * For the abstract case, we know if must be a parameter
457 * list if it is empty or starts with a type.
459 if (token
->special
== '(') {
461 struct token
*next
= token
->next
;
462 int fn
= (p
&& *p
) || match_op(next
, ')') || lookup_type(next
);
465 struct symbol
*base_type
= ctype
->base_type
;
466 token
= declarator(next
, tree
, p
);
467 token
= expect(token
, ')', "in nested declarator");
468 while (ctype
->base_type
!= base_type
)
469 ctype
= &ctype
->base_type
->ctype
;
474 sym
= indirect(token
->pos
, ctype
, SYM_FN
);
475 token
= parameter_type_list(next
, sym
);
476 token
= expect(token
, ')', "in function declarator");
479 if (token
->special
== '[') {
480 struct symbol
*array
= indirect(token
->pos
, ctype
, SYM_ARRAY
);
481 token
= abstract_array_declarator(token
->next
, array
);
482 token
= expect(token
, ']', "in abstract_array_declarator");
483 ctype
= &array
->ctype
;
486 if (token
->special
== ':') {
487 struct symbol
*bitfield
;
488 struct expression
*expr
;
489 bitfield
= indirect(token
->pos
, ctype
, SYM_BITFIELD
);
490 token
= conditional_expression(token
->next
, &expr
);
491 bitfield
->fieldwidth
= get_expression_value(expr
);
502 static struct token
*pointer(struct token
*token
, struct ctype
*ctype
)
504 unsigned long modifiers
;
505 struct symbol
*base_type
;
507 modifiers
= ctype
->modifiers
& ~(MOD_TYPEDEF
| MOD_ATTRIBUTE
);
508 base_type
= ctype
->base_type
;
509 ctype
->modifiers
= modifiers
;
511 while (match_op(token
,'*')) {
512 struct symbol
*ptr
= alloc_symbol(token
->pos
, SYM_PTR
);
513 ptr
->ctype
.modifiers
= modifiers
& ~MOD_STORAGE
;
514 ptr
->ctype
.as
= ctype
->as
;
515 ptr
->ctype
.context
= ctype
->context
;
516 ptr
->ctype
.contextmask
= ctype
->contextmask
;
517 ptr
->ctype
.base_type
= base_type
;
520 ctype
->modifiers
= modifiers
& MOD_STORAGE
;
521 ctype
->base_type
= base_type
;
524 ctype
->contextmask
= 0;
526 token
= declaration_specifiers(token
->next
, ctype
, 1);
531 static struct token
*declarator(struct token
*token
, struct symbol
**tree
, struct ident
**p
)
533 token
= pointer(token
, &(*tree
)->ctype
);
534 return direct_declarator(token
, tree
, p
);
537 static struct token
*struct_declaration_list(struct token
*token
, struct symbol_list
**list
)
539 while (!match_op(token
, '}')) {
540 struct ctype ctype
= {0, };
542 token
= declaration_specifiers(token
, &ctype
, 0);
544 struct ident
*ident
= NULL
;
545 struct symbol
*decl
= alloc_symbol(token
->pos
, SYM_NODE
);
547 token
= pointer(token
, &decl
->ctype
);
548 token
= direct_declarator(token
, &decl
, &ident
);
549 if (match_op(token
, ':')) {
550 struct expression
*expr
;
551 token
= parse_expression(token
->next
, &expr
);
553 add_symbol(list
, decl
);
554 if (!match_op(token
, ','))
558 if (!match_op(token
, ';'))
565 static struct token
*parameter_declaration(struct token
*token
, struct symbol
**tree
)
567 struct ident
*ident
= NULL
;
569 struct ctype ctype
= { 0, };
571 token
= declaration_specifiers(token
, &ctype
, 0);
572 sym
= alloc_symbol(token
->pos
, SYM_NODE
);
575 token
= pointer(token
, &sym
->ctype
);
576 token
= direct_declarator(token
, tree
, &ident
);
580 struct token
*typename(struct token
*token
, struct symbol
**p
)
582 struct symbol
*sym
= alloc_symbol(token
->pos
, SYM_NODE
);
584 token
= declaration_specifiers(token
, &sym
->ctype
, 0);
585 return declarator(token
, &sym
, NULL
);
588 struct token
*expression_statement(struct token
*token
, struct expression
**tree
)
590 token
= parse_expression(token
, tree
);
591 return expect(token
, ';', "at end of statement");
594 static struct token
*parse_asm_operands(struct token
*token
, struct statement
*stmt
)
596 struct expression
*expr
;
598 /* Allow empty operands */
599 if (match_op(token
->next
, ':') || match_op(token
->next
, ')'))
602 token
= primary_expression(token
->next
, &expr
);
603 token
= parens_expression(token
, &expr
, "in asm parameter");
604 } while (match_op(token
, ','));
608 static struct token
*parse_asm_clobbers(struct token
*token
, struct statement
*stmt
)
610 struct expression
*expr
;
613 token
= primary_expression(token
->next
, &expr
);
614 } while (match_op(token
, ','));
618 /* Make a statement out of an expression */
619 static struct statement
*make_statement(struct expression
*expr
)
621 struct statement
*stmt
;
625 stmt
= alloc_statement(expr
->pos
, STMT_EXPRESSION
);
626 stmt
->expression
= expr
;
631 * All iterators have two symbols associated with them:
632 * the "continue" and "break" symbols, which are targets
633 * for continue and break statements respectively.
635 * They are in a special name-space, but they follow
636 * all the normal visibility rules, so nested iterators
637 * automatically work right.
639 static void start_iterator(struct statement
*stmt
)
641 struct symbol
*cont
, *brk
;
643 start_symbol_scope();
644 cont
= alloc_symbol(stmt
->pos
, SYM_NODE
);
645 cont
->ident
= &continue_ident
;
646 bind_symbol(cont
, &continue_ident
, NS_ITERATOR
);
647 brk
= alloc_symbol(stmt
->pos
, SYM_NODE
);
648 brk
->ident
= &break_ident
;
649 bind_symbol(brk
, &break_ident
, NS_ITERATOR
);
651 stmt
->type
= STMT_ITERATOR
;
652 stmt
->iterator_break
= brk
;
653 stmt
->iterator_continue
= cont
;
654 fn_local_symbol(brk
);
655 fn_local_symbol(cont
);
658 static void end_iterator(struct statement
*stmt
)
663 static struct statement
*start_function(struct symbol
*sym
)
666 struct statement
*stmt
= alloc_statement(sym
->pos
, STMT_COMPOUND
);
668 start_function_scope();
669 ret
= alloc_symbol(sym
->pos
, SYM_NODE
);
670 ret
->ident
= &return_ident
;
671 ret
->ctype
= sym
->ctype
.base_type
->ctype
;
672 ret
->ctype
.modifiers
&= ~(MOD_STORAGE
| MOD_CONST
| MOD_VOLATILE
| MOD_INLINE
| MOD_ADDRESSABLE
| MOD_NOCAST
| MOD_NODEREF
| MOD_ACCESSED
| MOD_TOPLEVEL
);
673 ret
->ctype
.modifiers
|= (MOD_AUTO
| MOD_REGISTER
);
674 bind_symbol(ret
, &return_ident
, NS_ITERATOR
);
677 fn_local_symbol(ret
);
681 static void end_function(struct symbol
*sym
)
683 end_function_scope();
687 * A "switch()" statement, like an iterator, has a
688 * the "break" symbol associated with it. It works
689 * exactly like the iterator break - it's the target
690 * for any break-statements in scope, and means that
691 * "break" handling doesn't even need to know whether
692 * it's breaking out of an iterator or a switch.
694 * In addition, the "case" symbol is a marker for the
695 * case/default statements to find the switch statement
696 * that they are associated with.
698 static void start_switch(struct statement
*stmt
)
700 struct symbol
*brk
, *switch_case
;
702 start_symbol_scope();
703 brk
= alloc_symbol(stmt
->pos
, SYM_NODE
);
704 brk
->ident
= &break_ident
;
705 bind_symbol(brk
, &break_ident
, NS_ITERATOR
);
707 switch_case
= alloc_symbol(stmt
->pos
, SYM_NODE
);
708 switch_case
->ident
= &case_ident
;
709 bind_symbol(switch_case
, &case_ident
, NS_ITERATOR
);
710 switch_case
->stmt
= stmt
;
712 stmt
->type
= STMT_SWITCH
;
713 stmt
->switch_break
= brk
;
714 stmt
->switch_case
= switch_case
;
716 fn_local_symbol(brk
);
717 fn_local_symbol(switch_case
);
720 static void end_switch(struct statement
*stmt
)
722 if (!stmt
->switch_case
->symbol_list
)
723 warn(stmt
->pos
, "switch with no cases");
727 static void add_case_statement(struct statement
*stmt
)
729 struct symbol
*target
= lookup_symbol(&case_ident
, NS_ITERATOR
);
733 warn(stmt
->pos
, "not in switch scope");
736 sym
= alloc_symbol(stmt
->pos
, SYM_NODE
);
737 add_symbol(&target
->symbol_list
, sym
);
739 stmt
->case_label
= sym
;
740 fn_local_symbol(sym
);
743 static struct token
*parse_return_statement(struct token
*token
, struct statement
*stmt
)
745 struct symbol
*target
= lookup_symbol(&return_ident
, NS_ITERATOR
);
748 error(token
->pos
, "internal error: return without a function target");
749 stmt
->type
= STMT_RETURN
;
750 stmt
->ret_target
= target
;
751 return expression_statement(token
->next
, &stmt
->ret_value
);
754 static struct token
*parse_for_statement(struct token
*token
, struct statement
*stmt
)
756 struct symbol_list
*syms
;
757 struct expression
*e1
, *e2
, *e3
;
758 struct statement
*iterator
;
760 start_iterator(stmt
);
761 token
= expect(token
->next
, '(', "after 'for'");
765 /* C99 variable declaration? */
766 if (lookup_type(token
)) {
767 token
= external_declaration(token
, &syms
);
769 token
= parse_expression(token
, &e1
);
770 token
= expect(token
, ';', "in 'for'");
772 token
= parse_expression(token
, &e2
);
773 token
= expect(token
, ';', "in 'for'");
774 token
= parse_expression(token
, &e3
);
775 token
= expect(token
, ')', "in 'for'");
776 token
= statement(token
, &iterator
);
778 stmt
->iterator_syms
= syms
;
779 stmt
->iterator_pre_statement
= make_statement(e1
);
780 stmt
->iterator_pre_condition
= e2
;
781 stmt
->iterator_post_statement
= make_statement(e3
);
782 stmt
->iterator_post_condition
= e2
;
783 stmt
->iterator_statement
= iterator
;
789 struct token
*parse_while_statement(struct token
*token
, struct statement
*stmt
)
791 struct expression
*expr
;
792 struct statement
*iterator
;
794 start_iterator(stmt
);
795 token
= parens_expression(token
->next
, &expr
, "after 'while'");
796 token
= statement(token
, &iterator
);
798 stmt
->iterator_pre_condition
= expr
;
799 stmt
->iterator_post_condition
= expr
;
800 stmt
->iterator_statement
= iterator
;
806 struct token
*parse_do_statement(struct token
*token
, struct statement
*stmt
)
808 struct expression
*expr
;
809 struct statement
*iterator
;
811 start_iterator(stmt
);
812 token
= statement(token
->next
, &iterator
);
813 if (token_type(token
) == TOKEN_IDENT
&& token
->ident
== &while_ident
)
816 warn(token
->pos
, "expected 'while' after 'do'");
817 token
= parens_expression(token
, &expr
, "after 'do-while'");
819 stmt
->iterator_post_condition
= expr
;
820 stmt
->iterator_statement
= iterator
;
823 return expect(token
, ';', "after statement");
826 static struct token
*statement(struct token
*token
, struct statement
**tree
)
828 struct statement
*stmt
= alloc_statement(token
->pos
, STMT_NONE
);
831 if (token_type(token
) == TOKEN_IDENT
) {
832 if (token
->ident
== &if_ident
) {
833 stmt
->type
= STMT_IF
;
834 token
= parens_expression(token
->next
, &stmt
->if_conditional
, "after if");
835 token
= statement(token
, &stmt
->if_true
);
836 if (token_type(token
) != TOKEN_IDENT
)
838 if (token
->ident
!= &else_ident
)
840 return statement(token
->next
, &stmt
->if_false
);
843 if (token
->ident
== &return_ident
)
844 return parse_return_statement(token
, stmt
);
846 if (token
->ident
== &break_ident
|| token
->ident
== &continue_ident
) {
847 struct symbol
*target
= lookup_symbol(token
->ident
, NS_ITERATOR
);
848 stmt
->type
= STMT_GOTO
;
849 stmt
->goto_label
= target
;
851 warn(stmt
->pos
, "break/continue not in iterator scope");
852 return expect(token
->next
, ';', "at end of statement");
854 if (token
->ident
== &default_ident
) {
856 goto default_statement
;
858 if (token
->ident
== &case_ident
) {
859 token
= parse_expression(token
->next
, &stmt
->case_expression
);
860 if (match_op(token
, SPECIAL_ELLIPSIS
))
861 token
= parse_expression(token
->next
, &stmt
->case_to
);
863 stmt
->type
= STMT_CASE
;
864 token
= expect(token
, ':', "after default/case");
865 add_case_statement(stmt
);
866 return statement(token
, &stmt
->case_statement
);
868 if (token
->ident
== &switch_ident
) {
869 stmt
->type
= STMT_SWITCH
;
871 token
= parens_expression(token
->next
, &stmt
->switch_expression
, "after 'switch'");
872 token
= statement(token
, &stmt
->switch_statement
);
876 if (token
->ident
== &for_ident
)
877 return parse_for_statement(token
, stmt
);
879 if (token
->ident
== &while_ident
)
880 return parse_while_statement(token
, stmt
);
882 if (token
->ident
== &do_ident
)
883 return parse_do_statement(token
, stmt
);
885 if (token
->ident
== &goto_ident
) {
886 stmt
->type
= STMT_GOTO
;
888 if (match_op(token
, '*')) {
889 token
= parse_expression(token
->next
, &stmt
->goto_expression
);
890 } else if (token_type(token
) == TOKEN_IDENT
) {
891 stmt
->goto_label
= label_symbol(token
);
894 warn(token
->pos
, "Expected identifier or goto expression");
896 return expect(token
, ';', "at end of statement");
898 if (token
->ident
== &asm_ident
|| token
->ident
== &__asm___ident
|| token
->ident
== &__asm_ident
) {
899 struct expression
*expr
;
900 stmt
->type
= STMT_ASM
;
902 if (token_type(token
) == TOKEN_IDENT
) {
903 if (token
->ident
== &__volatile___ident
|| token
->ident
== &volatile_ident
)
906 token
= expect(token
, '(', "after asm");
907 token
= parse_expression(token
->next
, &expr
);
908 if (match_op(token
, ':'))
909 token
= parse_asm_operands(token
, stmt
);
910 if (match_op(token
, ':'))
911 token
= parse_asm_operands(token
, stmt
);
912 if (match_op(token
, ':'))
913 token
= parse_asm_clobbers(token
, stmt
);
914 token
= expect(token
, ')', "after asm");
915 return expect(token
, ';', "at end of asm-statement");
917 if (match_op(token
->next
, ':')) {
918 stmt
->type
= STMT_LABEL
;
919 stmt
->label_identifier
= label_symbol(token
);
920 return statement(token
->next
->next
, &stmt
->label_statement
);
924 if (match_op(token
, '{')) {
925 stmt
->type
= STMT_COMPOUND
;
926 start_symbol_scope();
927 token
= compound_statement(token
->next
, stmt
);
930 return expect(token
, '}', "at end of compound statement");
933 stmt
->type
= STMT_EXPRESSION
;
934 return expression_statement(token
, &stmt
->expression
);
937 struct token
* statement_list(struct token
*token
, struct statement_list
**list
)
940 struct statement
* stmt
;
941 if (eof_token(token
))
943 if (match_op(token
, '}'))
945 token
= statement(token
, &stmt
);
946 add_statement(list
, stmt
);
951 static struct token
*parameter_type_list(struct token
*token
, struct symbol
*fn
)
953 struct symbol_list
**list
= &fn
->arguments
;
955 struct symbol
*sym
= alloc_symbol(token
->pos
, SYM_NODE
);
957 if (match_op(token
, SPECIAL_ELLIPSIS
)) {
963 if (!lookup_type(token
)) {
964 warn(token
->pos
, "non-ANSI parameter list");
967 token
= parameter_declaration(token
, &sym
);
968 /* Special case: (void) */
969 if (!*list
&& !sym
->ident
&& sym
->ctype
.base_type
== &void_ctype
)
971 add_symbol(list
, sym
);
972 if (!match_op(token
, ','))
980 struct token
*compound_statement(struct token
*token
, struct statement
*stmt
)
982 while (!eof_token(token
)) {
983 if (!lookup_type(token
))
985 token
= external_declaration(token
, &stmt
->syms
);
987 token
= statement_list(token
, &stmt
->stmts
);
991 static struct expression
*identifier_expression(struct token
*token
)
993 struct expression
*expr
= alloc_expression(token
->pos
, EXPR_IDENTIFIER
);
994 expr
->expr_ident
= token
->ident
;
998 static struct expression
*index_expression(struct expression
*from
, struct expression
*to
)
1000 int idx_from
, idx_to
;
1001 struct expression
*expr
= alloc_expression(from
->pos
, EXPR_INDEX
);
1003 idx_from
= get_expression_value(from
);
1006 idx_to
= get_expression_value(to
);
1007 if (idx_to
< idx_from
|| idx_from
< 0)
1008 warn(from
->pos
, "nonsense array initializer index range");
1010 expr
->idx_from
= idx_from
;
1011 expr
->idx_to
= idx_to
;
1015 static struct token
*initializer_list(struct expression_list
**list
, struct token
*token
)
1018 struct token
*next
= token
->next
;
1019 struct expression
*expr
;
1021 if (match_op(token
, '.') && (token_type(next
) == TOKEN_IDENT
) && match_op(next
->next
, '=')) {
1022 add_expression(list
, identifier_expression(next
));
1023 token
= next
->next
->next
;
1024 } else if ((token_type(token
) == TOKEN_IDENT
) && match_op(next
, ':')) {
1025 add_expression(list
, identifier_expression(token
));
1027 } else if (match_op(token
, '[')) {
1028 struct expression
*from
= NULL
, *to
= NULL
;
1029 token
= constant_expression(token
->next
, &from
);
1030 if (match_op(token
, SPECIAL_ELLIPSIS
))
1031 token
= constant_expression(token
->next
, &to
);
1032 add_expression(list
, index_expression(from
, to
));
1033 token
= expect(token
, ']', "at end of initializer index");
1034 token
= expect(token
, '=', "at end of initializer index");
1038 token
= initializer(&expr
, token
);
1041 add_expression(list
, expr
);
1042 if (!match_op(token
, ','))
1044 token
= token
->next
;
1049 struct token
*initializer(struct expression
**tree
, struct token
*token
)
1051 if (match_op(token
, '{')) {
1052 struct expression
*expr
= alloc_expression(token
->pos
, EXPR_INITIALIZER
);
1054 token
= initializer_list(&expr
->expr_list
, token
->next
);
1055 return expect(token
, '}', "at end of initializer");
1057 return assignment_expression(token
, tree
);
1060 static void declare_argument(struct symbol
*sym
, struct symbol
*fn
)
1063 warn(sym
->pos
, "no identifier for function argument");
1066 bind_symbol(sym
, sym
->ident
, NS_SYMBOL
);
1069 static struct token
*parse_function_body(struct token
*token
, struct symbol
*decl
,
1070 struct symbol_list
**list
)
1072 struct symbol
*base_type
= decl
->ctype
.base_type
;
1073 struct statement
*stmt
;
1076 function_symbol_list
= &decl
->symbol_list
;
1077 if (decl
->ctype
.modifiers
& MOD_EXTERN
) {
1078 if (!(decl
->ctype
.modifiers
& MOD_INLINE
))
1079 warn(decl
->pos
, "function with external linkage has definition");
1081 if (!(decl
->ctype
.modifiers
& MOD_STATIC
))
1082 decl
->ctype
.modifiers
|= MOD_EXTERN
;
1084 stmt
= start_function(decl
);
1086 base_type
->stmt
= stmt
;
1087 FOR_EACH_PTR (base_type
->arguments
, arg
) {
1088 declare_argument(arg
, base_type
);
1091 token
= compound_statement(token
->next
, stmt
);
1094 if (!(decl
->ctype
.modifiers
& MOD_INLINE
))
1095 add_symbol(list
, decl
);
1096 check_declaration(decl
);
1097 function_symbol_list
= NULL
;
1098 return expect(token
, '}', "at end of function");
1101 static struct token
*external_declaration(struct token
*token
, struct symbol_list
**list
)
1103 struct ident
*ident
= NULL
;
1104 struct symbol
*decl
;
1105 struct ctype ctype
= { 0, };
1106 struct symbol
*base_type
;
1109 /* Parse declaration-specifiers, if any */
1110 token
= declaration_specifiers(token
, &ctype
, 0);
1111 decl
= alloc_symbol(token
->pos
, SYM_NODE
);
1112 decl
->ctype
= ctype
;
1113 token
= pointer(token
, &decl
->ctype
);
1114 token
= declarator(token
, &decl
, &ident
);
1116 /* Just a type declaration? */
1118 return expect(token
, ';', "end of type declaration");
1120 decl
->ident
= ident
;
1122 /* type define declaration? */
1123 is_typedef
= (ctype
.modifiers
& MOD_TYPEDEF
) != 0;
1125 /* Typedef's don't have meaningful storage */
1127 ctype
.modifiers
&= ~MOD_STORAGE
;
1128 decl
->ctype
.modifiers
&= ~MOD_STORAGE
;
1131 bind_symbol(decl
, ident
, is_typedef
? NS_TYPEDEF
: NS_SYMBOL
);
1133 base_type
= decl
->ctype
.base_type
;
1134 if (!is_typedef
&& base_type
&& base_type
->type
== SYM_FN
) {
1135 if (match_op(token
, '{'))
1136 return parse_function_body(token
, decl
, list
);
1138 if (!(decl
->ctype
.modifiers
& MOD_STATIC
))
1139 decl
->ctype
.modifiers
|= MOD_EXTERN
;
1143 if (!is_typedef
&& match_op(token
, '=')) {
1144 if (decl
->ctype
.modifiers
& MOD_EXTERN
) {
1145 warn(decl
->pos
, "symbol with external linkage has initializer");
1146 decl
->ctype
.modifiers
&= ~MOD_EXTERN
;
1148 token
= initializer(&decl
->initializer
, token
->next
);
1151 if (!(decl
->ctype
.modifiers
& (MOD_EXTERN
| MOD_INLINE
))) {
1152 add_symbol(list
, decl
);
1153 if (function_symbol_list
)
1154 fn_local_symbol(decl
);
1157 check_declaration(decl
);
1159 if (!match_op(token
, ','))
1163 decl
= alloc_symbol(token
->pos
, SYM_NODE
);
1164 decl
->ctype
= ctype
;
1165 token
= pointer(token
, &decl
->ctype
);
1166 token
= declarator(token
->next
, &decl
, &ident
);
1168 warn(token
->pos
, "expected identifier name in type definition");
1172 bind_symbol(decl
, ident
, is_typedef
? NS_TYPEDEF
: NS_SYMBOL
);
1174 /* Function declarations are automatically extern unless specifically static */
1175 base_type
= decl
->ctype
.base_type
;
1176 if (!is_typedef
&& base_type
&& base_type
->type
== SYM_FN
) {
1177 if (!(decl
->ctype
.modifiers
& MOD_STATIC
))
1178 decl
->ctype
.modifiers
|= MOD_EXTERN
;
1181 return expect(token
, ';', "at end of declaration");
1184 void translation_unit(struct token
*token
, struct symbol_list
**list
)
1186 while (!eof_token(token
))
1187 token
= external_declaration(token
, list
);
1188 // They aren't needed any more
1189 clear_token_alloc();