Start marking variables with VCL versions.

(It doesn't get to the C code yet.)

doc/sphinx/reference/vcl_var.rst

@@ -215,7 +215,7 @@ req.url
 	The requested URL, for instance "/robots.txt".
 	
 
-req.proto
+req.proto	``VCL <= 4.0``
 
 	Type: STRING
 
@@ -223,7 +223,15 @@ req.proto
 
 	Writable from: client
 
+	The HTTP protocol version used by the client, usually "HTTP/1.1"
+	or "HTTP/2.0".
 	
+req.proto	``VCL >= 4.1``
+
+	Type: STRING
+
+	Readable from: client
+
 	The HTTP protocol version used by the client, usually "HTTP/1.1"
 	or "HTTP/2.0".
 	
@@ -302,7 +310,7 @@ req.xid
 
 	Unique ID of this request.
 
-req.esi
+req.esi	``VCL <= 4.0``
 
 	Type: BOOL
 
@@ -312,9 +320,8 @@ req.esi
 
 	Set to `false` to disable ESI processing
 	regardless of any value in beresp.do_esi. Defaults
-	to `true`. This variable is subject to change in
-	future versions, you should avoid using it.
-	
+	to `true`. This variable is replaced by `resp.do_esi`
+	in VCL 4.1.
 
 req.can_gzip
 
@@ -515,7 +522,7 @@ bereq.url
 	The requested URL, copied from `req.url`
 	
 
-bereq.proto
+bereq.proto	``VCL <= 4.0``
 
 	Type: STRING
 
@@ -526,6 +533,15 @@ bereq.proto
 	The HTTP protocol version, "HTTP/1.1" unless a pass or pipe
 	request has "HTTP/1.0" in `req.proto`
 	
+bereq.proto	``VCL >= 4.1``
+
+	Type: STRING
+
+	Readable from: vcl_pipe, backend
+	
+	The HTTP protocol version, "HTTP/1.1" unless a pass or pipe
+	request has "HTTP/1.0" in `req.proto`
+	
 
 bereq.http.*
 
@@ -620,7 +636,7 @@ beresp.body
 	
 	For producing a synthetic body.
 
-beresp.proto
+beresp.proto	``VCL <= 4.0``
 
 	Type: STRING
 
@@ -630,6 +646,14 @@ beresp.proto
 
 	The HTTP protocol version the backend replied with.
 	
+beresp.proto	``VCL >= 4.1``
+
+	Type: STRING
+
+	Readable from: vcl_backend_response, vcl_backend_error
+
+	The HTTP protocol version the backend replied with.
+	
 
 beresp.status
 
@@ -855,7 +879,6 @@ obj.proto
 
 	Readable from: vcl_hit
 
-	
 	The HTTP protocol version stored in the object.
 	
 
@@ -959,7 +982,10 @@ resp
 ~~~~
 
 This is the response we send to the client, it is built from either
-`beresp` (pass/miss) or `obj` (hits).
+`beresp` (pass/miss), `obj` (hits) or created from whole cloth (synth).
+
+With the exception of `resp.body` all `resp.*` variables available
+in both `vcl_deliver{}` and `vcl_synth{}` as a matter of symmetry.
 
 resp
 
@@ -978,7 +1004,17 @@ resp.body
 
 	To produce a synthetic response body, for instance for errors.
 
-resp.proto
+resp.proto	``VCL <= 4.0``
+
+	Type: STRING
+
+	Readable from: vcl_deliver, vcl_synth
+
+	Writable from: vcl_deliver, vcl_synth
+
+	The HTTP protocol version to use for the response.
+
+resp.proto	``VCL >= 4.1``
 
 	Type: STRING
 

lib/libvcc/generate.py

@@ -169,21 +169,41 @@ returns = (
 sp_variables = collections.OrderedDict()
 
 class vardef(object):
-	def __init__(self, nam, typ, rd, wr, doc, uns):
+	def __init__(self, nam, typ, rd, wr, wu, vlo, vhi):
+		if nam in sp_variables:
+			return
 		sp_variables[nam] = self
 		self.nam = nam
 		self.typ = typ
 		self.rd = rd
 		self.wr = wr
-		self.doc = doc
-		self.uns = uns
+		self.uns = wu
+		self.vlo = vlo
+		self.vhi = vhi
+
+def parse_vcl(x):
+	vlo,vhi = (0,99)
+	x = x.split()
+	if x[0] == "VCL" and x[1] == "<=":
+		vhi = int(float(x[2]) * 10)
+	elif x[0] == "VCL" and x[1] == ">=":
+		vlo = int(float(x[2]) * 10)
+	else:
+		print("Unknown variable version spec")
+		print("XXX", x, vlo, vhi)
+		exit(2)
+	return vlo,vhi
 
 def parse_var(ln):
-	vn = ln.pop(0).split()
-	assert len(vn) == 1
-	vn = vn[0]
+	l1 = ln.pop(0).split("``")
+	assert len(l1) in (1,3)
+	vn = l1[0].strip()
 	if vn[-1] == '*':
 		vn = vn[:-1]
+	if len(l1) == 3:
+		vlo,vhi = parse_vcl(l1[1])
+	else:
+		vlo,vhi = 0,99
 	vr = []
 	vw = []
 	vu = []
@@ -209,9 +229,8 @@ def parse_var(ln):
 				vu.append(i.strip(",."))
 			continue
 		break
-	doc = "\n" + l + "\n" + "\n".join(ln)
 	if vn[:8] != "storage.":
-		vardef(vn, vt, vr, vw, doc, uns=vu)
+		vardef(vn, vt, vr, vw, vu, vlo, vhi)
 
 def parse_var_doc(fn):
 	s = 0