Check expression width for sanity

Assertion to check for insane expression widths that are likely caused by compiler bugs.
2008-09-28 08:58:08 -07:00 · 2008-09-28 08:58:08 -07:00 · 729771e562
parent 0bb1f9740b
commit 729771e562
2 changed files with 8 additions and 1 deletions
--- a/netlist.cc
+++ b/netlist.cc
@ -1992,6 +1992,13 @@ void NetExpr::cast_signed(bool flag)
      signed_flag_ = flag;
 }

+void NetExpr::expr_width(unsigned w)
+{
+	// Catch underflow wrap errors.
+      ivl_assert(*this, w < (UINT_MAX - 256));
+      width_ = w;
+}
+
 bool NetExpr::has_width() const
 {
      return true;
--- a/netlist.h
+++ b/netlist.h
@ -1581,7 +1581,7 @@ class NetExpr  : public LineInfo {


    protected:
-      void expr_width(unsigned w) { width_ = w; }
+      void expr_width(unsigned w);
      void cast_signed_base_(bool flag) {signed_flag_ = flag; }

    private: