From: Clifford Wolf <clifford@clifford.at>
Date: Fri, 25 Sep 2015 10:38:01 +0000 (+0200)
Subject: Fixed segfault in AstNode::asReal
X-Git-Tag: yosys-0.6~133
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=b2544cfcf77c3a7e923d05151a8e37b079559119;p=yosys.git

Fixed segfault in AstNode::asReal
---

diff --git a/frontends/ast/ast.cc b/frontends/ast/ast.cc
index 5044eeabc..3e163bae7 100644
--- a/frontends/ast/ast.cc
+++ b/frontends/ast/ast.cc
@@ -831,7 +831,7 @@ double AstNode::asReal(bool is_signed)
 	{
 		RTLIL::Const val(bits);
 
-		bool is_negative = is_signed && val.bits.back() == RTLIL::State::S1;
+		bool is_negative = is_signed && !val.bits.empty() && val.bits.back() == RTLIL::State::S1;
 		if (is_negative)
 			val = const_neg(val, val, false, false, val.bits.size());