X-Git-Url: https://git.draconx.ca/gitweb/cdecl99.git/blobdiff_plain/f5e2e659f116a49afd3b9d9f37553646e62fa4d4..b36da52d0e7798814d23cdc9979fc1900f8e9e51:/src/parse.y?ds=inline
diff --git a/src/parse.y b/src/parse.y
index fdffa40..9c644da 100644
--- a/src/parse.y
+++ b/src/parse.y
@@ -1,3 +1,4 @@
+%code top {
/*
* Parser for C declarations.
* Copyright © 2011 Nick Bowler
@@ -15,18 +16,27 @@
* You should have received a copy of the GNU General Public License
* along with this program. If not, see .
*/
+}
+%name-prefix "cdecl__yy"
+%parse-param {void *scanner}
%parse-param {struct cdecl **out}
+%lex-param {yyscan_t scanner}
%define api.pure
%error-verbose
%locations
%{
+#include
+#include
+#include
+
#include "scan.h"
+#include "error.h"
#include "cdecl.h"
#define FAIL(msg) do { \
- yyerror(&yylloc, NULL, msg); \
+ yyerror(&yylloc, NULL, NULL, msg); \
YYERROR; \
} while (0)
@@ -47,12 +57,14 @@
}
%code provides {
-void yyerror(YYLTYPE *, struct cdecl **, const char *);
-int yyparse(struct cdecl **out);
+void cdecl__free(struct cdecl *);
+void cdecl__yyerror(YYLTYPE *, void *, struct cdecl **, const char *);
+int cdecl__yyparse(void *scanner, struct cdecl **out);
}
%union {
uintmax_t uintval;
+ _Bool boolval;
char *strval;
struct cdecl_declspec *declspec;
struct cdecl_declarator *declarator;
@@ -60,6 +72,8 @@ int yyparse(struct cdecl **out);
}
%{
+static void free_decl(struct cdecl *);
+
static void free_declspec(struct cdecl_declspec *x)
{
struct cdecl_declspec *p;
@@ -74,30 +88,69 @@ static void free_declspec(struct cdecl_declspec *x)
static void free_declarator(struct cdecl_declarator *x)
{
struct cdecl_declarator *p;
+
+ while (x) {
+ p = x->child;
+
+ switch (x->type) {
+ case CDECL_DECL_NULL:
+ break;
+ case CDECL_DECL_IDENT:
+ free(x->u.ident);
+ break;
+ case CDECL_DECL_POINTER:
+ free_declspec(x->u.pointer.qualifiers);
+ break;
+ case CDECL_DECL_ARRAY:
+ free(x->u.array.vla);
+ break;
+ case CDECL_DECL_FUNCTION:
+ free_decl(x->u.function.parameters);
+ break;
+ default:
+ assert(0);
+ }
+
+ free(x);
+ x = p;
+ }
+}
+
+static void free_decl(struct cdecl *x)
+{
+ struct cdecl *p;
+
while (x) {
p = x->next;
- free(x->ident);
+
+ /* The specifiers may be shared by an entire chain. */
+ if (!p || p->specifiers != x->specifiers)
+ free_declspec(x->specifiers);
+
+ free_declarator(x->declarators);
free(x);
x = p;
}
}
-void cdecl_free(struct cdecl *decl)
+void cdecl__free(struct cdecl *decl)
{
- free_declspec(decl->specifiers);
- free_declarator(decl->declarators);
- free(decl);
+ free_decl(decl);
}
%}
%destructor { free($$); }
%destructor { free_declspec($$); }
%destructor { free_declarator($$); }
-%destructor { cdecl_free($$); }
+%destructor { free_decl($$); }
+/* Magic tokens */
%token T_LEX_ERROR
+%token T_ENGLISH
%token T_IDENT "identifier"
+%token T_UINT "integer constant"
+
%token T_SEMICOLON ";"
%token T_ASTERISK "*"
%token T_LPAREN "("
@@ -105,87 +158,157 @@ void cdecl_free(struct cdecl *decl)
%token T_LBRACKET "["
%token T_RBRACKET "]"
%token T_COMMA ","
+%token T_ELLIPSIS "..."
+
+%token T_TYPEDEF "typedef"
+%token T_EXTERN "extern"
+%token T_STATIC "static"
+%token T_AUTO "auto"
+%token T_REGISTER "register"
+
+%token T_INLINE "inline"
+
+%token T_RESTRICT "restrict"
+%token T_VOLATILE "volatile"
+%token T_CONST "const"
-%token T_TYPEDEF "typedef"
-%token T_EXTERN "extern"
-%token T_STATIC "static"
-%token T_AUTO "auto"
-%token T_REGISTER "register"
-
-%token T_INLINE "inline"
-
-%token T_RESTRICT "restrict"
-%token T_VOLATILE "volatile"
-%token T_CONST "const"
-
-%token T_VOID "void"
-%token T_CHAR "char"
-%token T_SHORT "short"
-%token T_INT "int"
-%token T_LONG "long"
-%token T_FLOAT "float"
-%token T_DOUBLE "double"
-%token T_SIGNED "signed"
-%token T_UNSIGNED "unsigned"
-%token T_BOOL "_Bool"
-%token T_COMPLEX "_Complex"
-
-%token T_STRUCT "struct"
-%token T_UNION "union"
-%token T_ENUM "enum"
-
-%type declspec_simple
-%type declspec declspecs
-%type declarator declarators
-%type declaration
+%token T_VOID "void"
+%token T_CHAR "char"
+%token T_SHORT "short"
+%token T_INT "int"
+%token T_LONG "long"
+%token T_FLOAT "float"
+%token T_DOUBLE "double"
+%token T_SIGNED "signed"
+%token T_UNSIGNED "unsigned"
+%token T_BOOL "_Bool"
+%token T_COMPLEX "_Complex"
+%token T_IMAGINARY "_Imaginary"
+
+%token T_STRUCT "struct"
+%token T_UNION "union"
+%token T_ENUM "enum"
+
+/*
+ * English keywords.
+ */
+%token T_TYPE "type"
+%token T_DECLARE "declare"
+%token T_POINTER "pointer"
+%token T_FUNCTION "function"
+%token T_RETURNING "returning"
+%token T_ARRAY "array"
+%token T_TO "to"
+%token T_OF "of"
+%token T_AS "as"
+%token T_VLA "variable-length"
+
+%type vla_ident
+%type varargs
+%type declspec_simple typespec_simple qualifier_simple
+%type declspec_notype declspec_noid typespec_noid typespec
+%type qualifier qualifiers
+%type declspecs declspecs_noid
+%type direct_declarator declarator pointer array parens postfix
+%type direct_declarator_ish declarator_ish parameter_type_list
+%type declaration declarators declarator_wrap
+%type parameter parameters
+
+%type english_vla
+%type storage_func_specs post_specs
+%type type_qual_spec type_qual_specs typedef_name_qual
+%type english_declarator english_array english_function
+%type english_parameter_list null_decl
+%type english_parameter english_parameters
+%type english english_declaration
+
+/*
+ * Harmless shift/reduce conflicts in english_parameter. See comments below
+ * for more details.
+ */
+%expect 2
%%
-input: declaration {
+input: T_ENGLISH english {
+ *out = $2;
+} | declaration {
*out = $1;
};
-declaration: declspecs declarators T_SEMICOLON {
- ALLOC_STRUCT($$, struct cdecl,
- .specifiers = $1,
- .declarators = $2);
+semi: | T_SEMICOLON
+
+declaration: declspecs declarators semi {
+ $$ = $2;
+
+ for (struct cdecl *i = $$; i; i = i->next)
+ i->specifiers = $1;
};
-declspecs: { $$ = NULL; } | declspecs declspec {
+declspecs: declspec_notype declspecs {
+ $$ = $1;
+ $$->next = $2;
+} | typespec declspecs_noid {
+ $$ = $1;
+ $$->next = $2;
+}
+
+declspecs_noid: { $$ = NULL; } | declspec_noid declspecs_noid {
+ $$ = $1;
+ $$->next = $2;
+}
+
+qualifiers: { $$ = NULL; } | qualifiers qualifier {
$$ = $2;
$$->next = $1;
}
-declarators: declarator | declarator T_COMMA declarators {
+declarators: declarator_wrap | declarator_wrap T_COMMA declarators {
$$ = $1;
$$->next = $3;
-};
+}
-declspec_simple: T_VOID { $$ = 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; }
+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 { $$ = CDECL_STOR_STATIC; }
- | T_AUTO { $$ = CDECL_STOR_AUTO; }
| T_REGISTER { $$ = CDECL_STOR_REGISTER; }
- | T_RESTRICT { $$ = CDECL_QUAL_RESTRICT; }
- | T_VOLATILE { $$ = CDECL_QUAL_VOLATILE; }
- | T_CONST { $$ = CDECL_QUAL_CONST; }
| T_INLINE { $$ = CDECL_FUNC_INLINE; }
- ;
-declspec: declspec_simple {
+typespec_simple: T_VOID { $$ = 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($$, struct cdecl_declspec, .type = $1);
-} | T_STRUCT T_IDENT {
+}
+
+typespec_noid: typespec_simple {
+ ALLOC_STRUCT($$, 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);
@@ -201,21 +324,269 @@ declspec: declspec_simple {
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($$, "");
+}
+
+array: T_LBRACKET T_UINT T_RBRACKET {
+ if ($2 == 0)
+ FAIL("array length must be positive");
-declarator: T_IDENT {
+ ALLOC_STRUCT($$, 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,
- .ident = $1);
-} | T_LPAREN declarator T_RPAREN {
+ .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($$, sizeof "");
+ strcpy($$, "");
+}
%%
-void yyerror(YYLTYPE *loc, struct cdecl **out, const char *err)
+void
+yyerror(YYLTYPE *loc, yyscan_t scanner, struct cdecl **out, const char *err)
{
if (strstr(err, "T_LEX_ERROR"))
return;
- fprintf(stderr, "%s\n", err);
+ cdecl__set_error(&(const struct cdecl_error){
+ .code = CDECL_ENOPARSE,
+ .str = err,
+ });
}