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Added fields for basic types

These new fields in the type structure allow know the properties of the basic
type without doing complex comparision

--- a/types.c

+++ b/types.c

@@ -2,18 +2,26 @@

 #include <assert.h>

 #include <stdlib.h>

+#include "tokens.h"

 #include "types.h"

+

 #define xcalloc calloc

-struct type tschar, tuchar;             /* signed char, unsigned char */

-struct type tshort, tushort;            /* short,  unsigned short */

-struct type tint, tuint;                /* int,  unsigned int */

-struct type tfloat, tdouble, tldouble;	/* float, double, long double */

-struct type tlong, tulong;		/* long, unsgined long */

-struct type tllong, tullong;		/* long long, unsigned long long */

-struct type tvoid;			/* void */

-

+struct type tschar = {.btype = CHAR, .sign = 1};

+struct type tuchar = {.btype = CHAR, .sign = 0};

+struct type tshort = {.btype = SHORT, .sign = 1};

+struct type tushort = {.btype = SHORT, .sign = 0};

+struct type tint = {.btype = INT, .sign = 1};

+struct type tuint = {.btype = SHORT, .sign = 0};

+struct type tfloat = {.btype = FLOAT, .sign = 1};

+struct type tdouble = {.btype = DOUBLE, .sign = 1};

+struct type tldouble = {.btype = LDOUBLE, .sign = 1};

+struct type tlong = {.btype = LONG, .sign = 1};

+struct type tulong = {.btype = LONG, .sign = 0};

+struct type tllong = {.btype = LLONG, .sign = 1};

+struct type tullong = {.btype = LLONG, .sign = 0};

+struct type tvoid = {.btype = VOID, .sign = 0};

 struct type *mktype(register struct type *base, unsigned  char op)

 {

--- a/types.h

+++ b/types.h

@@ -9,8 +9,12 @@

 	struct type *ptr;		/* pointer */

 	struct type *ftn;		/* function */

 	union  {

-		size_t nelem;

-	} u;

+		struct {

+			unsigned btype : 4;

+			unsigned sign : 1;

+		};

+		size_t nelem;		      /* size of array */

+	};

 };