Cary R.'s additional system functions, real value error messages, etc.

I've changed the find_entity() error messages to asserts since
this should be fixed by the previous patch.

tgt-vhdl/Makefile.in

@@ -40,7 +40,7 @@ CPPFLAGS = @ident_support@ -I. -I$(srcdir)/.. @CPPFLAGS@ @DEFS@ @PICFLAG@
 CXXFLAGS = -Wall @CXXFLAGS@
 LDFLAGS = @LDFLAGS@
 
-all: dep vhdl.tgt vhdl.conf
+all: dep vhdl.tgt vhdl.conf vhdl-s.conf
 
 dep:
 	mkdir dep
@@ -74,7 +74,8 @@ distclean: clean
 
 check: all
 
-install: all installdirs $(libdir)/ivl/vhdl.tgt $(libdir)/ivl/vhdl.conf
+install: all installdirs $(libdir)/ivl/vhdl.tgt $(libdir)/ivl/vhdl.conf \
+	$(libdir)/ivl/vhdl-s.conf
 
 $(libdir)/ivl/vhdl.tgt: ./vhdl.tgt
 	$(INSTALL_PROGRAM) ./vhdl.tgt $(DESTDIR)$(libdir)/ivl/vhdl.tgt
@@ -82,6 +83,9 @@ $(libdir)/ivl/vhdl.tgt: ./vhdl.tgt
 $(libdir)/ivl/vhdl.conf: vhdl.conf
 	$(INSTALL_DATA) $< $(DESTDIR)$(libdir)/ivl/vhdl.conf
 
+$(libdir)/ivl/vhdl-s.conf: vhdl-s.conf
+	$(INSTALL_DATA) $< $(DESTDIR)$(libdir)/ivl/vhdl-s.conf
+
 installdirs: ../mkinstalldirs
 	$(srcdir)/../mkinstalldirs $(DESTDIR)$(libdir)/ivl
 

tgt-vhdl/expr.cc

@@ -505,8 +505,42 @@ static vhdl_expr *translate_concat(ivl_expr_t e)
 
 vhdl_expr *translate_sfunc_time(ivl_expr_t e)
 {
-   cerr << "warning: no translation for time (returning 0)" << endl;
-   return new vhdl_const_int(0);
+   cerr << "warning: no translation for $time (returning 0)" << endl;
+   vhdl_expr *result = new vhdl_const_int(0);
+   result->set_comment("$time not supported, returned 0 instead!");
+   return result;
+}
+
+vhdl_expr *translate_sfunc_stime(ivl_expr_t e)
+{
+   cerr << "warning: no translation for $stime (returning 0)" << endl;
+   vhdl_expr *result = new vhdl_const_int(0);
+   result->set_comment("$stime not supported, returned 0 instead!");
+   return result;
+}
+
+vhdl_expr *translate_sfunc_simtime(ivl_expr_t e)
+{
+   cerr << "warning: no translation for $simtime (returning 0)" << endl;
+   vhdl_expr *result = new vhdl_const_int(0);
+   result->set_comment("$simtime not supported, returned 0 instead!");
+   return result;
+}
+
+vhdl_expr *translate_sfunc_random(ivl_expr_t e)
+{
+   cerr << "warning: no translation for $random (returning 0)" << endl;
+   vhdl_expr *result = new vhdl_const_int(0);
+   result->set_comment("$random not supported, returned 0 instead!");
+   return result;
+}
+
+vhdl_expr *translate_sfunc_fopen(ivl_expr_t e)
+{
+   cerr << "warning: no translation for $fopen (returning 0)" << endl;
+   vhdl_expr *result = new vhdl_const_int(0);
+   result->set_comment("$fopen not supported, returned 0 instead!");
+   return result;
 }
 
 vhdl_expr *translate_sfunc(ivl_expr_t e)
@@ -514,6 +548,14 @@ vhdl_expr *translate_sfunc(ivl_expr_t e)
    const char *name = ivl_expr_name(e);
    if (strcmp(name, "$time") == 0)
       return translate_sfunc_time(e);
+   else if (strcmp(name, "$stime") == 0)
+      return translate_sfunc_stime(e);
+   else if (strcmp(name, "$simtime") == 0)
+      return translate_sfunc_simtime(e);
+   else if (strcmp(name, "$random") == 0)
+      return translate_sfunc_random(e);
+   else if (strcmp(name, "$fopen") == 0)
+      return translate_sfunc_random(e);
    else {
       error("No translation for system function %s", name);
       return NULL;
@@ -551,6 +593,10 @@ vhdl_expr *translate_expr(ivl_expr_t e)
       return translate_concat(e);
    case IVL_EX_SFUNC:
       return translate_sfunc(e);
+   case IVL_EX_REALNUM:
+      error("No VHDL translation for real expression at %s:%d",
+            ivl_expr_file(e), ivl_expr_lineno(e));
+      return NULL;
    default:
       error("No VHDL translation for expression at %s:%d (type = %d)",
             ivl_expr_file(e), ivl_expr_lineno(e), type);

tgt-vhdl/scope.cc

@@ -157,9 +157,10 @@ void draw_nexus(ivl_nexus_t nexus)
       ivl_net_const_t con;
       if ((log = ivl_nexus_ptr_log(nexus_ptr))) {
          ivl_scope_t log_scope = ivl_logic_scope(log);
-         vhdl_scope *vhdl_scope =
-            find_entity(ivl_scope_name(log_scope))->get_arch()->get_scope();
-
+         vhdl_entity *ent = find_entity(ivl_scope_name(log_scope));
+         assert(ent);
+         
+         vhdl_scope *vhdl_scope = ent->get_arch()->get_scope();
          if (visible_nexus(priv, vhdl_scope)) {
             // Already seen this signal in vhdl_scope
          }
@@ -177,9 +178,10 @@ void draw_nexus(ivl_nexus_t nexus)
       }
       else if ((lpm = ivl_nexus_ptr_lpm(nexus_ptr))) {
          ivl_scope_t lpm_scope = ivl_lpm_scope(lpm);
-         vhdl_scope *vhdl_scope =
-            find_entity(ivl_scope_name(lpm_scope))->get_arch()->get_scope();
-
+         vhdl_entity *ent = find_entity(ivl_scope_name(lpm_scope));
+         assert(ent);
+         
+         vhdl_scope *vhdl_scope = ent->get_arch()->get_scope();
          if (visible_nexus(priv, vhdl_scope)) {
             // Already seen this signal in vhdl_scope
          }
@@ -196,6 +198,11 @@ void draw_nexus(ivl_nexus_t nexus)
          }
       }
       else if ((con = ivl_nexus_ptr_con(nexus_ptr))) {
+         if (ivl_const_type(con) == IVL_VT_REAL) {
+            error("No VHDL translation for real constant (%g)",
+                  ivl_const_real(con));
+            continue;
+         }
          if (ivl_const_width(con) == 1)
             priv->const_driver = new vhdl_const_bit(ivl_const_bits(con)[0]);
          else

tgt-vhdl/stmt.cc

@@ -69,7 +69,13 @@ static int draw_stask(vhdl_procedural *proc, stmt_container *container,
    else if (strcmp(name, "$finish") == 0)
       return draw_stask_finish(proc, container, stmt);
    else {
-      error("No VHDL translation for system task %s", name);
+      vhdl_seq_stmt *result = new vhdl_null_stmt();
+      ostringstream ss;
+      ss << "Unsupported system task " << name << " omitted here ("
+         << ivl_stmt_file(stmt) << ":" << ivl_stmt_lineno(stmt) << ")";
+      result->set_comment(ss.str());
+      container->add_stmt(result);
+      cerr << "Warning: no VHDL translation for system task " << name << endl;
       return 0;
    }
 }

tgt-vhdl/vhdl-s.conf

@@ -0,0 +1,7 @@
+functor:synth2
+functor:synth
+functor:syn-rules
+functor:cprop
+functor:nodangle
+-t:dll
+flag:DLL=vhdl.tgt

tgt-vhdl/vhdl_syntax.cc

@@ -512,6 +512,7 @@ void vhdl_const_string::emit(std::ostream &of, int level) const
 void vhdl_null_stmt::emit(std::ostream &of, int level) const
 {
    of << "null;";
+   emit_comment(of, level, true);
 }
 
 void vhdl_fcall::emit(std::ostream &of, int level) const
@@ -584,6 +585,7 @@ void vhdl_const_bit::emit(std::ostream &of, int level) const
 void vhdl_const_int::emit(std::ostream &of, int level) const
 {
    of << value_;
+   // We need to find a way to display a comment, since $time, etc. add one.
 }
 
 void vhdl_const_bool::emit(std::ostream &of, int level) const