scc

commit 7681aff4af1f56f6a0ed6a9451cc632f14bffbdd
parent afa081af77e19c67b8ded5203f8bed341af1cba6
Author: Roberto E. Vargas Caballero <k0ga@shike2.com>
Date:   Fri,  8 Aug 2014 11:44:41 +0200

Add addresability of constants

Diffstat:
M
cc2/cc2.h
 | 
1
+
M
cc2/cgen.c
 | 
11
++++++++++-
M
cc2/parser.c
 | 
3
++-

3 files changed, 13 insertions(+), 2 deletions(-)
diff --git a/cc2/cc2.h b/cc2/cc2.h
@@ -39,6 +39,7 @@ enum nerrors {
 #define AUTO 'A'
 #define REGISTER 'R'
 #define STATIC 'S'
+#define CONST '#'
 
 extern void error(unsigned nerror, ...);
 extern void genaddable(Node *np);
diff --git 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 @@ genaddable(Node *np)
 	case STATIC:
 		np->addable = 12;
 		break;
+	case CONST:
+		np->addable = 20;
+		break;
 	}
-	return;
 }
diff --git a/cc2/parser.c b/cc2/parser.c
@@ -132,7 +132,8 @@ immediate(char op)
 {
 	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;