From 93bc5affd3fc635dafec3a37bf4c5b94c252036f Mon Sep 17 00:00:00 2001
From: whitequark <whitequark@whitequark.org>
Date: Mon, 8 Jul 2019 11:34:58 +0000
Subject: Allow attributes on individual switch cases in RTLIL.

The parser changes are slightly awkward. Consider the following IL:

    process $0
      <point 1>
      switch \foo
        <point 2>
        case 1'1
          assign \bar \baz
          <point 3>
          ...
        case
      end
    end

Before this commit, attributes are valid in <point 1>, and <point 3>
iff it is immediately followed by a `switch`. (They are essentially
attached to the switch.) But, after this commit, and because switch
cases do not have an ending delimiter, <point 3> becomes ambiguous:
the attribute could attach to either the following `case`, or to
the following `switch`. This isn't expressible in LALR(1) and results
in a reduce/reduce conflict.

To address this, attributes inside processes are now valid anywhere
inside the process: in <point 1> and <point 3> a part of case body,
and in <point 2> as a separate rule. As a consequence, attributes
can now precede `assign`s, which is made illegal in the same way it
is illegal to attach attributes to `connect`.

Attributes are tracked separately from the parser state, so this
does not affect collection of attributes at all, other than allowing
them on `case`s. The grammar change serves purely to allow attributes
in more syntactic places.
---
 kernel/rtlil.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'kernel/rtlil.h')

diff --git a/kernel/rtlil.h b/kernel/rtlil.h
index f4fcf5dcf..82cbfaf28 100644
--- a/kernel/rtlil.h
+++ b/kernel/rtlil.h
@@ -1327,7 +1327,7 @@ public:
 #endif
 };
 
-struct RTLIL::CaseRule
+struct RTLIL::CaseRule : public RTLIL::AttrObject
 {
 	std::vector<RTLIL::SigSpec> compare;
 	std::vector<RTLIL::SigSig> actions;
-- 
cgit v1.2.3