[master] 3d23688 Add a VSB for function prologues

[Poul-Henning Kamp]

commit 3d236885e806441fd2d9cbfe7c4d5c58ad716f5f
Author: Poul-Henning Kamp <phk at FreeBSD.org>
Date:   Tue Dec 12 09:45:54 2017 +0000

    Add a VSB for function prologues

diff --git a/lib/libvcc/vcc_compile.c b/lib/libvcc/vcc_compile.c
index e46c09e..28975b0 100644
--- a/lib/libvcc/vcc_compile.c
+++ b/lib/libvcc/vcc_compile.c
@@ -105,6 +105,8 @@ vcc_NewProc(struct vcc *tl, struct symbol *sym)
 	VTAILQ_INIT(&p->calls);
 	VTAILQ_INIT(&p->uses);
 	VTAILQ_INSERT_TAIL(&tl->procs, p, list);
+	p->prologue = VSB_new_auto();
+	AN(p->prologue);
 	p->body = VSB_new_auto();
 	AN(p->body);
 	p->cname = VSB_new_auto();
@@ -117,12 +119,14 @@ static void
 vcc_EmitProc(struct vcc *tl, struct proc *p)
 {
 	AZ(VSB_finish(p->cname));
+	AZ(VSB_finish(p->prologue));
 	AZ(VSB_finish(p->body));
 	Fh(tl, 1, "vcl_func_f %s;\n", VSB_data(p->cname));
 	Fc(tl, 1, "\nvoid v_matchproto_(vcl_func_f)\n");
 	Fc(tl, 1, "%s(VRT_CTX)\n", VSB_data(p->cname));
-	Fc(tl, 1, "{\n%s}\n", VSB_data(p->body));
+	Fc(tl, 1, "{\n%s\n%s}\n", VSB_data(p->prologue), VSB_data(p->body));
 	VSB_destroy(&p->body);
+	VSB_destroy(&p->prologue);
 	VSB_destroy(&p->cname);
 }
 
diff --git a/lib/libvcc/vcc_compile.h b/lib/libvcc/vcc_compile.h
index 2209f23..bade028 100644
--- a/lib/libvcc/vcc_compile.h
+++ b/lib/libvcc/vcc_compile.h
@@ -160,6 +160,7 @@ struct proc {
 	unsigned		active;
 	struct token		*return_tok[VCL_RET_MAX];
 	struct vsb		*cname;
+	struct vsb		*prologue;
 	struct vsb		*body;
 };