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Add addresability of constants

--- a/cc2/cc2.h

+++ b/cc2/cc2.h

@@ -39,6 +39,7 @@

 #define AUTO 'A'

 #define REGISTER 'R'

 #define STATIC 'S'

+#define CONST '#'

 extern void error(unsigned nerror, ...);

 extern void genaddable(Node *np);

--- a/cc2/cgen.c

+++ b/cc2/cgen.c

@@ -5,6 +5,13 @@

 #include "cc2.h"

+/*

+ * calculate addresability as follows

+ *     AUTO => 11

+ *     REGISTER => 13

+ *     STATIC => 12

+ *     CONST => 20

+ */

 void

 genaddable(Node *np)

 {

@@ -23,6 +30,8 @@

 	case STATIC:

 		np->addable = 12;

 		break;

+	case CONST:

+		np->addable = 20;

+		break;

 	}

-	return;

 }

--- a/cc2/parser.c

+++ b/cc2/parser.c

@@ -132,7 +132,8 @@

 {

 	Node *np = newnode();

-	np->op = '#';

+	np->op = CONST;

+	/* TODO: deal with constant non integer */

 	np->type = L_INT;

 	scanf("%d", &np->u.imm);

 	np->left = np->right = NULL;