X-Git-Url: https://git.draconx.ca/gitweb/cdecl99.git/blobdiff_plain/362559e5c1b4d138305f9edf2c2b7ee1a24a08f6..f5e2e659f116a49afd3b9d9f37553646e62fa4d4:/src/parse.y

diff --git a/src/parse.y b/src/parse.y
index 70e1878..fdffa40 100644
--- 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);
 }