Add an initial declaration parser.

[cdecl99.git] / src / parse.y

diff --git a/src/parse.y b/src/parse.y
index 70e18783db6cf68cda0ae447881f6188cc0cf0c5..fdffa40939f561c806bac62e06776ae3ae66c02b 100644 (file)
--- a/src/parse.y
+++ b/src/parse.y
@@ -16,28 +16,206 @@
  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+%parse-param {struct cdecl **out}
 %define api.pure
 %error-verbose
 %locations
 
 %{
 #include "scan.h"
+#include "cdecl.h"
+
+#define FAIL(msg) do { \
+       yyerror(&yylloc, NULL, msg); \
+       YYERROR; \
+} while (0)
+
+#define ALLOC(ptr, size) do { \
+       (ptr) = malloc(size); \
+       if (!(ptr)) \
+               FAIL("failed to allocate memory"); \
+} while (0)
+
+#define ALLOC_STRUCT(ptr, type, ...) do { \
+       ALLOC(ptr, sizeof (type)); \
+       *(ptr) = (type) { __VA_ARGS__ }; \
+} while (0)
 %}
 
+%code requires {
+#include <inttypes.h>
+}
+
 %code provides {
-void yyerror(const char *);
+void yyerror(YYLTYPE *, struct cdecl **, const char *);
+int yyparse(struct cdecl **out);
 }
 
 %union {
-       int foo;
+       uintmax_t uintval;
+       char *strval;
+       struct cdecl_declspec *declspec;
+       struct cdecl_declarator *declarator;
+       struct cdecl *decl;
+}
+
+%{
+static void free_declspec(struct cdecl_declspec *x)
+{
+       struct cdecl_declspec *p;
+       while (x) {
+               p = x->next;
+               free(x->ident);
+               free(x);
+               x = p;
+       }
 }
 
+static void free_declarator(struct cdecl_declarator *x)
+{
+       struct cdecl_declarator *p;
+       while (x) {
+               p = x->next;
+               free(x->ident);
+               free(x);
+               x = p;
+       }
+}
+
+void cdecl_free(struct cdecl *decl)
+{
+       free_declspec(decl->specifiers);
+       free_declarator(decl->declarators);
+       free(decl);
+}
+%}
+
+%destructor { free($$); }            <strval>
+%destructor { free_declspec($$); }   <declspec>
+%destructor { free_declarator($$); } <declarator>
+%destructor { cdecl_free($$); }      <decl>
+
+%token T_LEX_ERROR
+
+%token <strval> T_IDENT "identifier"
+%token T_SEMICOLON ";"
+%token T_ASTERISK  "*"
+%token T_LPAREN    "("
+%token T_RPAREN    ")"
+%token T_LBRACKET  "["
+%token T_RBRACKET  "]"
+%token T_COMMA     ","
+
+%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 <uintval>    declspec_simple
+%type <declspec>   declspec declspecs
+%type <declarator> declarator declarators
+%type <decl>       declaration
+
 %%
 
-input: ;
+input: declaration {
+       *out = $1;
+};
+
+declaration: declspecs declarators T_SEMICOLON {
+       ALLOC_STRUCT($$, struct cdecl,
+               .specifiers = $1,
+               .declarators = $2);
+};
+
+declspecs: { $$ = NULL; } | declspecs declspec {
+       $$ = $2;
+       $$->next = $1;
+}
+
+declarators: declarator | declarator 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     { $$ = CDECL_TYPE_COMPLEX;  }
+       | T_TYPEDEF     { $$ = 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  {
+       ALLOC_STRUCT($$, struct cdecl_declspec, .type = $1);
+} | T_STRUCT T_IDENT {
+       ALLOC_STRUCT($$, 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($$, struct cdecl_declspec,
+               .type = CDECL_TYPE_IDENT,
+               .ident = $1);
+};
+
+declarator: T_IDENT {
+       ALLOC_STRUCT($$, struct cdecl_declarator,
+               .type = CDECL_DECL_IDENT,
+               .ident = $1);
+} | T_LPAREN declarator T_RPAREN {
+       $$ = $2;
+};
 
 %%
-void yyerror(const char *err)
+void yyerror(YYLTYPE *loc, struct cdecl **out, const char *err)
 {
+       if (strstr(err, "T_LEX_ERROR"))
+               return;
+
        fprintf(stderr, "%s\n", err);
 }