Add builtin celltype $scopeinfo

Only declares the cell interface, doesn't make anything use or
understand $scopeinfo yet.

kernel/celltypes.h

@@ -108,6 +108,7 @@ struct CellTypes
 		setup_type(ID($overwrite_tag), {ID::A, ID::SET, ID::CLR}, pool<RTLIL::IdString>());
 		setup_type(ID($original_tag), {ID::A}, {ID::Y});
 		setup_type(ID($future_ff), {ID::A}, {ID::Y});
+		setup_type(ID($scopeinfo), {}, {});
 	}
 
 	void setup_internals_eval()

kernel/rtlil.cc

@@ -1769,6 +1769,15 @@ namespace {
 				return;
 			}
 
+			if (cell->type == ID($scopeinfo)) {
+				param(ID::TYPE);
+				check_expected();
+				std::string scope_type = cell->getParam(ID::TYPE).decode_string();
+				if (scope_type != "module" && scope_type != "struct")
+					error(__LINE__);
+				return;
+			}
+
 			if (cell->type == ID($_BUF_))    { port(ID::A,1); port(ID::Y,1); check_expected(); return; }
 			if (cell->type == ID($_NOT_))    { port(ID::A,1); port(ID::Y,1); check_expected(); return; }
 			if (cell->type == ID($_AND_))    { port(ID::A,1); port(ID::B,1); port(ID::Y,1); check_expected(); return; }

kernel/satgen.cc

@@ -1379,6 +1379,11 @@ bool SatGen::importCell(RTLIL::Cell *cell, int timestep)
 		return true;
 	}
 
+	if (cell->type == ID($scopeinfo))
+	{
+		return true;
+	}
+
 	// Unsupported internal cell types: $pow $fsm $mem*
 	// .. and all sequential cells with asynchronous inputs
 	return false;

techlibs/common/simlib.v

@@ -2763,3 +2763,10 @@ assign Y = A;
 endmodule
 
 // --------------------------------------------------------
+
+(* noblackbox *)
+module \$scopeinfo ();
+
+parameter TYPE = "";
+
+endmodule