From 74b43a9973a22c95411137721775c11d58665660 Mon Sep 17 00:00:00 2001
From: Michael Forney <mforney@mforney.org>
Date: Wed, 13 Mar 2019 12:25:35 -0700
Subject: Make `struct function` opaque

---
 backend.h | 10 +---------
 qbe.c     | 15 +++++++++++++++
 stmt.c    |  5 +++--
 3 files changed, 19 insertions(+), 11 deletions(-)

diff --git a/backend.h b/backend.h
index c4b1eaf..ae8699c 100644
--- a/backend.h
+++ b/backend.h
@@ -3,15 +3,6 @@ struct gotolabel {
 	_Bool defined;
 };
 
-struct function {
-	char *name;
-	struct declaration *namedecl;
-	struct type *type;
-	struct block *start, *end;
-	struct hashtable *gotos;
-	uint64_t lastid;
-};
-
 struct switchcases {
 	void *root;
 	struct value *defaultlabel;
@@ -34,6 +25,7 @@ struct value *mkintconst(struct representation *, uint64_t);
 uint64_t intconstvalue(struct value *);
 
 struct function *mkfunc(char *, struct type *, struct scope *);
+struct type *functype(struct function *);
 void funclabel(struct function *, struct value *);
 struct value *funcexpr(struct function *, struct expression *);
 void funcjmp(struct function *, struct value *);
diff --git a/qbe.c b/qbe.c
index a20851d..ceede55 100644
--- a/qbe.c
+++ b/qbe.c
@@ -71,6 +71,15 @@ struct switchcase {
 	struct value *body;
 };
 
+struct function {
+	char *name;
+	struct declaration *namedecl;
+	struct type *type;
+	struct block *start, *end;
+	struct hashtable *gotos;
+	uint64_t lastid;
+};
+
 struct representation i8 = {'w', 'b'};
 struct representation i16 = {'w', 'h'};
 struct representation i32 = {'w', 'w'};
@@ -397,6 +406,12 @@ mkfunc(char *name, struct type *t, struct scope *s)
 	return f;
 }
 
+struct type *
+functype(struct function *f)
+{
+	return f->type;
+}
+
 void
 funclabel(struct function *f, struct value *v)
 {
diff --git a/stmt.c b/stmt.c
index e642353..d732c31 100644
--- a/stmt.c
+++ b/stmt.c
@@ -275,8 +275,9 @@ stmt(struct function *f, struct scope *s)
 		break;
 	case TRETURN:
 		next();
-		if (f->type->base != &typevoid) {
-			e = exprconvert(expr(s), f->type->base);
+		t = functype(f);
+		if (t->base != &typevoid) {
+			e = exprconvert(expr(s), t->base);
 			v = funcexpr(f, e);
 			delexpr(e);
 		} else {
-- 
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