From c96d0f225c19059e2eb91b66934e7f01e5e5b43e Mon Sep 17 00:00:00 2001
From: Keith Rothman <537074+litghost@users.noreply.github.com>
Date: Thu, 11 Feb 2021 15:29:53 -0800
Subject: Refactor XDC parser into a little class for testing purposes.

Signed-off-by: Keith Rothman <537074+litghost@users.noreply.github.com>
---
 fpga_interchange/arch.cc | 11 +++++++++++
 fpga_interchange/xdc.cc  | 23 +++++++++--------------
 fpga_interchange/xdc.h   | 32 ++++++++++++++++++++++++++++++++
 3 files changed, 52 insertions(+), 14 deletions(-)
 create mode 100644 fpga_interchange/xdc.h

diff --git a/fpga_interchange/arch.cc b/fpga_interchange/arch.cc
index 8fd4d9dc..9263f3c4 100644
--- a/fpga_interchange/arch.cc
+++ b/fpga_interchange/arch.cc
@@ -33,6 +33,7 @@
 #include "router2.h"
 #include "timing.h"
 #include "util.h"
+#include "xdc.h"
 
 NEXTPNR_NAMESPACE_BEGIN
 
@@ -563,6 +564,16 @@ TimingClockingInfo Arch::getPortClockingInfo(const CellInfo *cell, IdString port
 void Arch::read_logical_netlist(const std::string &filename) {}
 void Arch::write_physical_netlist(const std::string &filename) const {}
 
+void Arch::parse_xdc(const std::string &filename) {
+    TclInterp interp(getCtx());
+    auto result = Tcl_EvalFile(interp.interp, filename.c_str());
+    if(result != TCL_OK) {
+        log_error("Error in %s:%d => %s\n", filename.c_str(),
+                Tcl_GetErrorLine(interp.interp),
+                Tcl_GetStringResult(interp.interp));
+    }
+}
+
 // -----------------------------------------------------------------------
 
 #ifdef WITH_HEAP
diff --git a/fpga_interchange/xdc.cc b/fpga_interchange/xdc.cc
index ee1d1cab..ece662f8 100644
--- a/fpga_interchange/xdc.cc
+++ b/fpga_interchange/xdc.cc
@@ -18,9 +18,9 @@
  *
  */
 
+#include "xdc.h"
 #include "log.h"
 #include "nextpnr.h"
-#include <tcl.h>
 #include <string>
 
 NEXTPNR_NAMESPACE_BEGIN
@@ -139,8 +139,8 @@ static int set_property(
     return TCL_OK;
 }
 
-void Arch::parse_xdc(const std::string &filename) {
-    Tcl_Interp *interp = Tcl_CreateInterp();
+TclInterp::TclInterp(Context *ctx) {
+    interp = Tcl_CreateInterp();
     NPNR_ASSERT(Tcl_Init(interp) == TCL_OK);
 
     Tcl_RegisterObjType(&port_object);
@@ -149,23 +149,18 @@ void Arch::parse_xdc(const std::string &filename) {
     NPNR_ASSERT(Tcl_Eval(interp,
                 "proc unknown args {\n"
                 "  set result [scan [lindex $args 0] \"%d\" value]\n"
-                "  if { $result == 1 && [llength $args] == 1] } {\n"
+                "  if { $result == 1 && [llength $args] == 1 } {\n"
                 "    return \\[$value\\]\n"
                 "  } else {\n"
                 "    uplevel 1 [list _original_unknown {*}$args]\n"
                 "  }\n"
                 "}") == TCL_OK);
-    Tcl_CreateObjCommand(interp, "get_ports", get_ports, getCtx(), nullptr);
-    Tcl_CreateObjCommand(interp, "set_property", set_property, getCtx(), nullptr);
-    auto result = Tcl_EvalFile(interp, filename.c_str());
-    if(result != TCL_OK) {
-        log_error("Error in %s:%d => %s\n", filename.c_str(), Tcl_GetErrorLine(interp), Tcl_GetStringResult(interp));
-    }
-    Tcl_DeleteInterp(interp);
-    Tcl_Finalize();
+    Tcl_CreateObjCommand(interp, "get_ports", get_ports, ctx, nullptr);
+    Tcl_CreateObjCommand(interp, "set_property", set_property, ctx, nullptr);
 }
 
+TclInterp::~TclInterp() {
+    Tcl_DeleteInterp(interp);
+}
 
 NEXTPNR_NAMESPACE_END
-
-
diff --git a/fpga_interchange/xdc.h b/fpga_interchange/xdc.h
new file mode 100644
index 00000000..b41c86f8
--- /dev/null
+++ b/fpga_interchange/xdc.h
@@ -0,0 +1,32 @@
+/*
+ *  nextpnr -- Next Generation Place and Route
+ *
+ *  Copyright (C) 2021  Symbiflow Authors
+ *
+ *  Permission to use, copy, modify, and/or distribute this software for any
+ *  purpose with or without fee is hereby granted, provided that the above
+ *  copyright notice and this permission notice appear in all copies.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ *  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ *  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ *  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ *  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ *  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ */
+
+#include "nextpnr.h"
+#include <tcl.h>
+
+NEXTPNR_NAMESPACE_BEGIN
+
+struct TclInterp {
+    TclInterp(Context *ctx);
+    ~TclInterp();
+
+    Tcl_Interp *interp;
+};
+
+NEXTPNR_NAMESPACE_END
-- 
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