+input: T_ENGLISH english {
+ *out = $2;
+} | declaration {
+ *out = $1;
+};
+
+semi: | T_SEMICOLON
+
+declaration: declspecs declarators semi {
+ $$ = $2;
+
+ for (struct cdecl *i = $$; i; i = i->next)
+ i->specifiers = $1;
+};
+
+declspecs: declspec_notype declspecs {
+ $$ = $1;
+ $$->next = $2;
+} | typespec declspecs_noid {
+ $$ = $1;
+ $$->next = $2;
+}
+
+declspecs_noid: { $$ = NULL; } | declspec_noid declspecs_noid {
+ $$ = $1;
+ $$->next = $2;
+}
+
+qualifiers: { $$ = NULL; } | qualifiers qualifier {
+ $$ = $2;
+ $$->next = $1;
+}
+
+declarators: declarator_wrap | declarator_wrap T_COMMA declarators {
+ $$ = $1;
+ $$->next = $3;
+}
+
+declarator_wrap: declarator {
+ ALLOC_STRUCT($$, struct cdecl, .declarators = $1);
+}
+
+declspec_simple: T_AUTO { $$ = CDECL_STOR_AUTO; }
+ | T_TYPEDEF { $$ = CDECL_STOR_TYPEDEF; }
+ | T_EXTERN { $$ = CDECL_STOR_EXTERN; }
+ | T_STATIC { $$ = CDECL_STOR_STATIC; }
+ | T_REGISTER { $$ = CDECL_STOR_REGISTER; }
+ | T_INLINE { $$ = CDECL_FUNC_INLINE; }
+
+typespec_simple: T_VOID { $$ = CDECL_TYPE_VOID; }
+ | T_CHAR { $$ = CDECL_TYPE_CHAR; }
+ | T_SHORT { $$ = CDECL_TYPE_SHORT; }
+ | T_INT { $$ = CDECL_TYPE_INT; }
+ | T_LONG { $$ = CDECL_TYPE_LONG; }
+ | T_FLOAT { $$ = CDECL_TYPE_FLOAT; }
+ | T_DOUBLE { $$ = CDECL_TYPE_DOUBLE; }
+ | T_SIGNED { $$ = CDECL_TYPE_SIGNED; }
+ | T_UNSIGNED { $$ = CDECL_TYPE_UNSIGNED; }
+ | T_BOOL { $$ = CDECL_TYPE_BOOL; }
+ | T_COMPLEX { $$ = CDECL_TYPE_COMPLEX; }
+ | T_IMAGINARY { $$ = CDECL_TYPE_IMAGINARY; }
+
+qualifier_simple: T_CONST { $$ = CDECL_QUAL_CONST; }
+ | T_RESTRICT { $$ = CDECL_QUAL_RESTRICT; }
+ | T_VOLATILE { $$ = CDECL_QUAL_VOLATILE; }
+
+declspec_notype: qualifier | declspec_simple {
+ ALLOC_STRUCT($$, struct cdecl_declspec, .type = $1);
+}
+
+typespec_noid: typespec_simple {
+ ALLOC_STRUCT($$, struct cdecl_declspec, .type = $1);
+}
+
+qualifier: qualifier_simple {
+ ALLOC_STRUCT($$, struct cdecl_declspec, .type = $1);
+}
+
+typespec: typespec_noid | T_STRUCT T_IDENT {
+ ALLOC_STRUCT($$, struct cdecl_declspec,
+ .type = CDECL_TYPE_STRUCT,
+ .ident = $2);
+} | T_UNION T_IDENT {
+ ALLOC_STRUCT($$, struct cdecl_declspec,
+ .type = CDECL_TYPE_UNION,
+ .ident = $2);
+} | T_ENUM T_IDENT {
+ ALLOC_STRUCT($$, struct cdecl_declspec,
+ .type = CDECL_TYPE_ENUM,
+ .ident = $2);
+} | T_IDENT {
+ ALLOC_STRUCT($$, struct cdecl_declspec,
+ .type = CDECL_TYPE_IDENT,
+ .ident = $1);
+}
+
+declspec_noid: declspec_notype | typespec_noid
+
+vla_ident: T_IDENT | T_ASTERISK {
+ ALLOC($$, sizeof "");
+ strcpy($$, "");
+}
+
+array: T_LBRACKET T_UINT T_RBRACKET {
+ if ($2 == 0)
+ FAIL("array length must be positive");
+
+ ALLOC_STRUCT($$, struct cdecl_declarator,
+ .type = CDECL_DECL_ARRAY,
+ .u.array.length = $2);
+} | T_LBRACKET vla_ident T_RBRACKET {
+ ALLOC_STRUCT($$, struct cdecl_declarator,
+ .type = CDECL_DECL_ARRAY,
+ .u.array.vla = $2);
+} | T_LBRACKET T_RBRACKET {
+ ALLOC_STRUCT($$, struct cdecl_declarator,
+ .type = CDECL_DECL_ARRAY);
+}
+
+parameter: declspecs declarator {
+ ALLOC_STRUCT($$, struct cdecl,
+ .specifiers = $1,
+ .declarators = $2);
+}
+
+parameters: parameter | parameters T_COMMA parameter {
+ $$ = $3;
+ $$->next = $1;
+}
+
+varargs: { $$ = false; } | T_COMMA T_ELLIPSIS { $$ = true; }
+
+parameter_type_list: parameters varargs {
+ struct cdecl *p, *c, *n;
+
+ /* Parameters were accumulated in reverse order. */
+ for (p = NULL, c = $1; c; p = c, c = n) {
+ n = c->next;
+ c->next = p;
+ }
+
+ ALLOC_STRUCT($$, struct cdecl_declarator,
+ .type = CDECL_DECL_FUNCTION,
+ .u.function.parameters = p,
+ .u.function.variadic = $2);
+}
+
+parens: T_LPAREN parameter_type_list T_RPAREN {
+ $$ = $2;
+} | T_LPAREN declarator_ish T_RPAREN {
+ ALLOC_STRUCT($$, struct cdecl_declarator,
+ .type = CDECL_DECL_FUNCTION);
+ ALLOC_STRUCT($$->u.function.parameters, struct cdecl,
+ .declarators = $2);
+}
+
+pointer: T_ASTERISK qualifiers direct_declarator {
+ ALLOC_STRUCT($$, struct cdecl_declarator,
+ .type = CDECL_DECL_POINTER,
+ .u.pointer.qualifiers = $2,
+ .child = $3);
+} | T_ASTERISK qualifiers pointer {
+ ALLOC_STRUCT($$, struct cdecl_declarator,
+ .type = CDECL_DECL_POINTER,
+ .u.pointer.qualifiers = $2,
+ .child = $3);
+}
+
+declarator: direct_declarator | pointer
+declarator_ish: direct_declarator_ish | pointer
+postfix: array | parens
+
+direct_declarator_ish: {
+ ALLOC_STRUCT($$, struct cdecl_declarator,
+ .type = CDECL_DECL_NULL);
+} | direct_declarator_ish postfix {
+ $$ = $2;
+ $$->child = $1;
+}
+
+direct_declarator: {
+ ALLOC_STRUCT($$, struct cdecl_declarator,
+ .type = CDECL_DECL_NULL);
+} | T_IDENT {
+ ALLOC_STRUCT($$, struct cdecl_declarator,
+ .type = CDECL_DECL_IDENT,
+ .u.ident = $1);
+} | direct_declarator postfix {
+ $$ = $2;
+ $$->child = $1;
+}
+
+english: T_DECLARE T_IDENT T_AS english_declaration {
+ $$ = $4;
+ for (struct cdecl_declarator *d = $$->declarators; d; d = d->child) {
+ if (d->type == CDECL_DECL_NULL) {
+ d->type = CDECL_DECL_IDENT;
+ d->u.ident = $2;
+ }
+ }
+} | T_TYPE english_declaration {
+ $$ = $2;
+}
+
+storage_func_specs: { $$ = NULL; } | declspec_simple storage_func_specs {
+ ALLOC_STRUCT($$, struct cdecl_declspec,
+ .type = $1,
+ .next = $2);
+}
+
+type_qual_spec: typespec_noid | qualifier
+
+type_qual_specs: { $$ = NULL; } | type_qual_spec type_qual_specs {
+ $$ = $1;
+ $$->next = $2;
+}
+
+/*
+ * The "qualifiers" nonterminal needs to be used here to avoid shift/reduce
+ * conflicts with pointer declarators. So we end up needing to stitch
+ * together three different specifiers lists.
+ */
+post_specs: qualifiers typespec type_qual_specs {
+ $$ = $2;
+ $$->next = $1;
+ for (struct cdecl_declspec *s = $$; s; s = s->next) {
+ if (!s->next) {
+ s->next = $3;
+ break;
+ }
+ }
+}
+
+english_declaration: storage_func_specs english_declarator post_specs {
+ ALLOC_STRUCT($$, struct cdecl,
+ .specifiers = $3,
+ .declarators = $2);
+
+ for (struct cdecl_declspec *s = $$->specifiers; s; s = s->next) {
+ if (!s->next) {
+ s->next = $1;
+ break;
+ }
+ }
+}
+
+english_declarator: {
+ ALLOC_STRUCT($$, struct cdecl_declarator,
+ .type = CDECL_DECL_NULL);
+} | english_declarator qualifiers T_POINTER T_TO {
+ ALLOC_STRUCT($$, struct cdecl_declarator,
+ .type = CDECL_DECL_POINTER,
+ .child = $1,
+ .u.pointer.qualifiers = $2);
+} | english_declarator english_array {
+ $$ = $2;
+ $$->child = $1;
+} | english_declarator english_function {
+ $$ = $2;
+ $$->child = $1;
+}
+
+english_function: T_FUNCTION T_RETURNING {
+ ALLOC_STRUCT($$, struct cdecl_declarator,
+ .type = CDECL_DECL_FUNCTION,
+ .u.function.parameters = NULL);
+} | T_FUNCTION T_LPAREN english_parameter_list T_RPAREN T_RETURNING {
+ $$ = $3;
+}
+
+english_parameter_list: english_parameters varargs {
+ struct cdecl *p, *c, *n;
+
+ /* Parameters were accumulated in reverse order. */
+ for (p = NULL, c = $1; c; p = c, c = n) {
+ n = c->next;
+ c->next = p;
+ }
+
+ ALLOC_STRUCT($$, struct cdecl_declarator,
+ .type = CDECL_DECL_FUNCTION,
+ .u.function.parameters = p,
+ .u.function.variadic = $2);
+}
+
+english_parameters: english_parameters T_COMMA english_parameter {
+ $$ = $3;
+ $$->next = $1;
+} | english_parameter
+
+typedef_name_qual: T_IDENT qualifiers {
+ ALLOC_STRUCT($$, struct cdecl_declspec,
+ .type = CDECL_TYPE_IDENT,
+ .ident = $1,
+ .next = $2);
+}
+
+null_decl: {
+ ALLOC_STRUCT($$, struct cdecl_declarator,
+ .type = CDECL_DECL_NULL);
+}
+
+/*
+ * There is a small shift/reduce conflict here. An unadorned identifier
+ * as the first thing in the parameter might be a typedef name deep in the
+ * first english_declaration (thus empty storage_func_specs and empty
+ * english_declarator need to be reduced) or it might be the identifier
+ * before the "as" (thus the identifier should be shifted).
+ *
+ * The typedef name conflict is the only issue, so treating it as a special
+ * case makes the shift harmless.
+ */
+english_parameter: english_declaration | typedef_name_qual null_decl {
+ ALLOC_STRUCT($$, struct cdecl,
+ .specifiers = $1,
+ .declarators = $2);
+} | T_IDENT T_AS english_declaration {
+ $$ = $3;
+ for (struct cdecl_declarator *d = $$->declarators; d; d = d->child) {
+ if (d->type == CDECL_DECL_NULL) {
+ d->type = CDECL_DECL_IDENT;
+ d->u.ident = $1;
+ }
+ }
+}
+
+english_array: T_VLA T_ARRAY english_vla T_OF {
+ ALLOC_STRUCT($$, struct cdecl_declarator,
+ .type = CDECL_DECL_ARRAY,
+ .u.array.vla = $3);
+} | T_ARRAY T_UINT T_OF {
+ if ($2 == 0)
+ FAIL("array length must be positive");
+
+ ALLOC_STRUCT($$, struct cdecl_declarator,
+ .type = CDECL_DECL_ARRAY,
+ .u.array.length = $2);
+} | T_ARRAY T_OF {
+ ALLOC_STRUCT($$, struct cdecl_declarator,
+ .type = CDECL_DECL_ARRAY,
+ .u.array.length = 0);
+}
+
+english_vla: T_IDENT | {
+ ALLOC($$, sizeof "");
+ strcpy($$, "");
+}