Fix imports under multiple instantiated cells, bug542.

Changes

@@ -7,6 +7,8 @@ indicates the contributor was also the author of the fix; Thanks!
 
 ****  Fix double-deep parameter cell WIDTHs, bug541.  [Hiroki Honda]
 
+****  Fix imports under multiple instantiated cells, bug542. [Alex Solomatnikov]
+
 ****  Fix defparam in generate broke in 3.840, bug543. [Alex Solomatnikov]
 
 

src/V3LinkDot.cpp

@@ -743,8 +743,7 @@ private:
 	    }
 	}
 	m_curSymp->import(srcp, nodep->name());
-	// No longer needed
-	nodep->unlinkFrBack()->deleteTree(); nodep=NULL;
+	// No longer needed, but can't delete until any multi-instantiated modules are expanded
     }
 
     virtual void visit(AstNode* nodep, AstNUser*) {
@@ -1297,6 +1296,7 @@ private:
 				       <<"'"<<" as a "<<foundp->nodep()->typeName()
 				       <<" but expected a "<<expectWhat);
 		    } else if (m_dotText=="") {
+			UINFO(7,"   ErrParseRef curSymp=se"<<(void*)m_curSymp<<" dotSymp=se"<<(void*)m_dotSymp<<endl);
 			nodep->v3error("Can't find definition of "<<expectWhat
 				       <<": "<<nodep->prettyName());
 		    } else {
@@ -1445,7 +1445,9 @@ private:
 		nodep->packagep(foundp->packagep());
 		UINFO(7,"         Resolved "<<nodep<<endl);  // Also prints taskp
 	    } else {
+		// Note ParseRef has similar error handling/message output
 		m_statep->preErrorDump();
+		UINFO(7,"   ErrFtask curSymp=se"<<(void*)m_curSymp<<" dotSymp=se"<<(void*)dotSymp<<endl);
 		if (nodep->dotted() == "") {
 		    nodep->v3error("Can't find definition of task/function: "<<nodep->prettyName());
 		} else {
@@ -1527,6 +1529,10 @@ private:
 	}
 	nodep->unlinkFrBack()->deleteTree();
     }
+    virtual void visit(AstPackageImport* nodep, AstNUser*) {
+	// No longer needed
+	nodep->unlinkFrBack()->deleteTree(); nodep=NULL;
+    }
     virtual void visit(AstNode* nodep, AstNUser*) {
 	// Default: Just iterate
 	nodep->iterateChildren(*this);

test_regress/t/t_package_dimport.pl

@@ -0,0 +1,16 @@
+#!/usr/bin/perl
+if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); die; }
+# DESCRIPTION: Verilator: Verilog Test driver/expect definition
+#
+# Copyright 2003 by Wilson Snyder. This program is free software; you can
+# redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+
+compile (
+	 );
+
+# Compile only
+
+ok(1);
+1;

test_regress/t/t_package_dimport.v

@@ -0,0 +1,68 @@
+// DESCRIPTION: Verilator: Verilog Test module
+//
+// This file ONLY is placed into the Public Domain, for any use,
+// without warranty, 2009 by Wilson Snyder.
+
+package defs;
+   function automatic integer max;
+      input integer a;
+      input integer b;
+      max = (a > b) ? a : b;
+   endfunction
+
+   function automatic integer log2;
+      input integer value;
+      value = value >> 1;
+      for (log2 = 0; value > 0; log2 = log2 + 1)
+        value = value >> 1;
+   endfunction
+
+   function automatic integer ceil_log2;
+      input integer value;
+      value = value - 1;
+      for (ceil_log2 = 0; value > 0; ceil_log2 = ceil_log2 + 1)
+        value = value >> 1;
+   endfunction
+endpackage
+
+module sub();
+
+   import defs::*;
+
+   parameter RAND_NUM_MAX          = "";
+
+   localparam DATA_RANGE           = RAND_NUM_MAX + 1;
+   localparam DATA_WIDTH           = ceil_log2(DATA_RANGE);
+   localparam WIDTH                = max(4, ceil_log2(DATA_RANGE + 1));
+
+endmodule
+
+module t(/*AUTOARG*/
+   // Inputs
+   clk
+   );
+
+   import defs::*;
+
+   parameter WHICH          = 0;
+   parameter MAX_COUNT      = 10;
+
+   localparam MAX_EXPONENT         = log2(MAX_COUNT);
+   localparam EXPONENT_WIDTH       = ceil_log2(MAX_EXPONENT + 1);
+
+   input                           clk;
+
+   generate
+      if (WHICH == 1)
+	begin : which_true
+           sub sub_true();
+           defparam sub_true.RAND_NUM_MAX   = MAX_EXPONENT;
+	end
+      else
+	begin : which_false
+           sub sub_false();
+           defparam sub_false.RAND_NUM_MAX   = MAX_COUNT;
+	end
+   endgenerate
+
+endmodule