scc

commit c73f4071591a3c11ae68f082d751e957e39c14fb
parent e430542e447c41173e8b94e77b52d2c20177bc2f
Author: Roberto E. Vargas Caballero <k0ga@shike2.com>
Date:   Wed, 11 Dec 2024 10:45:47 +0100

cc2: Add index nodes

These nodes are going to be useful when we want to express
an indirect access based in a register with some offset.

Diffstat:
M
src/cmd/scc-cc/cc2/cc2.h
 | 
15
+++++++++------
M
src/cmd/scc-cc/cc2/code.c
 | 
19
+++++++++++++++++--

2 files changed, 26 insertions(+), 8 deletions(-)
diff --git a/src/cmd/scc-cc/cc2/cc2.h b/src/cmd/scc-cc/cc2/cc2.h
@@ -60,6 +60,7 @@ enum op {
 	/* kind of operand */
 	/* operands */
 	OMEM     = 'M',
+	OINDEX   = 'I',
 	OTMP     = 'N',
 	OAUTO    = 'A',
 	OREG     = 'R',
@@ -167,7 +168,7 @@ struct symbol {
 	char *name;
 	char kind;
 	union {
-		unsigned long off;
+		long off;
 		Node *stmt;
 		Inst *inst;
 	} u;
@@ -178,16 +179,17 @@ struct symbol {
 struct node {
 	char op;
 	Type type;
-	char complex;
-	char address;
-	unsigned char flags;
+	int complex;
+	int address;
+	unsigned flags;
 	union {
 		TUINT i;
 		TFLOAT f;
-		char reg;
 		char *s;
 		Symbol *sym;
-		char subop;
+		int reg;
+		int subop;
+		long off;
 	} u;
 	Symbol *label;
 	Node *left, *right;
@@ -234,6 +236,7 @@ extern void setlabel(Symbol *);
 extern Node *label2node(Node *np, Symbol *sym);
 extern Node *constnode(Node *np, TUINT n, Type *tp);
 extern Node *tmpnode(Type *);
+extern Node *idxnode(Node *, long);
 extern Symbol *newlabel(void);
 extern void pprint(char *s);
 extern void deftype(Type *);
diff --git a/src/cmd/scc-cc/cc2/code.c b/src/cmd/scc-cc/cc2/code.c
@@ -43,6 +43,10 @@ addr(Node *np, Addr *addr)
 		/* TODO: Add support for more type of constants */
 		addr->u.i = np->u.i;
 		break;
+	case OINDEX:
+		addr->kind = SINDEX;
+		addr->u.off = np->u.off;
+		break;
 	case OREG:
 	case OTMP:
 	case OLABEL:
@@ -154,13 +158,24 @@ tmpnode(Type *tp)
 }
 
 Node *
+idxnode(Node *np, long off)
+{
+	if (!np)
+		np = node(OINDEX);
+	np->op = OINDEX;
+	np->left = np->right = NULL;
+	np->type = ptrtype;
+	np->u.off = off;
+	return np;
+}
+
+Node *
 constnode(Node *np, TUINT n, Type *tp)
 {
 	if (!np)
 		np = node(OCONST);
 	np->op = OCONST;
-	np->left = NULL;
-	np->right = NULL;
+	np->left = np->right = NULL;
 	np->type = *tp;
 	np->u.i = n;
 	return np;