shithub: scc

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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.

--- a/cc2/cc2.h

+++ b/cc2/cc2.h

@@ -12,7 +12,8 @@

 	union {

 		struct {

 			Type *type;

-			char storage;

+			char sclass;

+			short off;

 		} v;

 		struct {

 			short addr;

@@ -68,4 +69,4 @@

 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);

--- a/cc2/cgen.c

+++ b/cc2/cgen.c

@@ -12,11 +12,16 @@

 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 {

--- a/cc2/parser.c

+++ b/cc2/parser.c

@@ -273,7 +273,7 @@

 		break;

 	}

 	sym->type = VAR;

-	sym->u.v.storage = class;

+	sym->u.v.sclass = class;

 	sym->u.v.type = gettype(strtok(NULL, "\t"));

 }

-- 

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