scc

commit cfd9181ebc248b4eeb49e80fa82efbe95404e87b
parent abf79a2fe6621ed253aa4559e06cc20d1189ff4b
Author: Roberto E. Vargas Caballero <k0ga@shike2.com>
Date:   Sun, 10 Aug 2014 10:55:35 +0200

Add offset field in symbols

When symbols are stored in the stack they have associated an offset
in the same that will be used in the instructions.

Diffstat:
M
cc2/cc2.h
 | 
6
+++---
M
cc2/cgen.c
 | 
13
+++++++++----
M
cc2/parser.c
 | 
2
+-

3 files changed, 13 insertions(+), 8 deletions(-)
diff --git a/cc2/cc2.h b/cc2/cc2.h
@@ -12,7 +12,8 @@ typedef struct symbol {
 	union {
 		struct {
 			Type *type;
-			char storage;
+			char sclass;
+			short off;
 		} v;
 		struct {
 			short addr;
@@ -68,4 +69,4 @@ enum nerrors {
 extern void error(unsigned nerror, ...);
 extern void genaddable(Node *list[]);
 extern void cgen(Symbol *sym, Node *list[]);
-extern void genstack(Symbol *fun);
-\ No newline at end of file
+extern void genstack(Symbol *fun);
diff --git a/cc2/cgen.c b/cc2/cgen.c
@@ -12,11 +12,16 @@ void
 genstack(Symbol *fun)
 {
 	Symbol *p;
-	short siz;
+	short size;
 
-	for (siz = 0, p = fun->u.f.vars; p; p = p->next)
-		siz += p->u.v.type->size;
-	fun->u.f.stack = siz;
+	for (size = 0, p = fun->u.f.vars; p; p = p->next) {
+		if (p->u.v.sclass == AUTO) {
+			p->u.v.off = size;
+			size += p->u.v.type->size;
+		}
+	}
+
+	fun->u.f.stack = size;
 }
 
 enum {
diff --git a/cc2/parser.c b/cc2/parser.c
@@ -273,7 +273,7 @@ declaration(char *token)
 		break;
 	}
 	sym->type = VAR;
-	sym->u.v.storage = class;
+	sym->u.v.sclass = class;
 	sym->u.v.type = gettype(strtok(NULL, "\t"));
 }