Add VHDL report statement

Not output yet, but will be used to replace std.textio
implementation of $display.

Conflicts:

	tgt-vhdl/vhdl_syntax.cc

tgt-vhdl/vhdl_syntax.cc

@@ -788,10 +788,42 @@ void vhdl_cassign_stmt::emit(std::ostream &of, int level) const
    of << ";";
 }
 
+vhdl_report_stmt::vhdl_report_stmt(vhdl_expr *text,
+                                   vhdl_severity_t severity)
+   : severity_(severity),
+     text_(text)
+{
+
+}
+
+void vhdl_report_stmt::emit(ostream& of, int level) const
+{
+   of << "report ";
+   text_->emit(of, level);
+
+   if (severity_ != SEVERITY_NOTE) {
+      const char *levels[] = { "note", "warning", "error", "failure" };
+      of << " severity " << levels[severity_];
+   }
+   
+   of << ";";
+}
+
+void vhdl_report_stmt::find_vars(vhdl_var_set_t& read, vhdl_var_set_t& write)
+{
+   text_->find_vars(read);
+}
+
+vhdl_assert_stmt::vhdl_assert_stmt(const char *reason)
+   : vhdl_report_stmt(new vhdl_const_string(reason), SEVERITY_FAILURE)
+{
+   
+}
+
 void vhdl_assert_stmt::emit(std::ostream &of, int level) const
 {
-   of << "assert false";  // TODO: Allow arbitrary expression
-   of << " report \"" << reason_ << "\" severity failure;";
+   of << "assert false ";  // TODO: Allow arbitrary expression
+   vhdl_report_stmt::emit(of, level);
 }
 
 vhdl_if_stmt::vhdl_if_stmt(vhdl_expr *test)

tgt-vhdl/vhdl_syntax.hh

@@ -453,15 +453,32 @@ public:
 };
 
 
-class vhdl_assert_stmt : public vhdl_seq_stmt {
-public:
-   vhdl_assert_stmt(const char *reason)
-      : reason_(reason) {}
+enum vhdl_severity_t {
+   SEVERITY_NOTE,
+   SEVERITY_WARNING,
+   SEVERITY_ERROR,
+   SEVERITY_FAILURE
+};
 
-   void emit(std::ostream &of, int level) const;
-   void find_vars(vhdl_var_set_t& read, vhdl_var_set_t& write) {}
+class vhdl_report_stmt : public vhdl_seq_stmt {
+public:
+   vhdl_report_stmt(vhdl_expr *text,
+                    vhdl_severity_t severity = SEVERITY_NOTE);
+   virtual ~vhdl_report_stmt() {}
+
+   virtual void emit(ostream& of, int level) const;
+   void find_vars(vhdl_var_set_t& read, vhdl_var_set_t& write);
 private:
-   std::string reason_;
+   vhdl_severity_t severity_;
+   vhdl_expr *text_;
+};
+
+
+class vhdl_assert_stmt : public vhdl_report_stmt {
+public:
+   vhdl_assert_stmt(const char *reason);
+
+   void emit(ostream &of, int level) const;
 };