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diff --git a/common/basectx.h b/common/basectx.h
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+/*
+ *  nextpnr -- Next Generation Place and Route
+ *
+ *  Copyright (C) 2018  Clifford Wolf <clifford@symbioticeda.com>
+ *  Copyright (C) 2018  Serge Bazanski <q3k@symbioticeda.com>
+ *
+ *  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.
+ *
+ */
+
+#ifndef BASECTX_H
+#define BASECTX_H
+
+#include <mutex>
+#include <unordered_map>
+#include <vector>
+#ifndef NPNR_DISABLE_THREADS
+#include <boost/thread.hpp>
+#endif
+
+#include "idstring.h"
+#include "nextpnr_namespaces.h"
+#include "nextpnr_types.h"
+#include "property.h"
+#include "str_ring_buffer.h"
+
+NEXTPNR_NAMESPACE_BEGIN
+
+struct Context;
+
+struct BaseCtx
+{
+#ifndef NPNR_DISABLE_THREADS
+    // Lock to perform mutating actions on the Context.
+    std::mutex mutex;
+    boost::thread::id mutex_owner;
+
+    // Lock to be taken by UI when wanting to access context - the yield()
+    // method will lock/unlock it when its' released the main mutex to make
+    // sure the UI is not starved.
+    std::mutex ui_mutex;
+#endif
+
+    // ID String database.
+    mutable std::unordered_map<std::string, int> *idstring_str_to_idx;
+    mutable std::vector<const std::string *> *idstring_idx_to_str;
+
+    // Temporary string backing store for logging
+    mutable StrRingBuffer log_strs;
+
+    // Project settings and config switches
+    std::unordered_map<IdString, Property> settings;
+
+    // Placed nets and cells.
+    std::unordered_map<IdString, std::unique_ptr<NetInfo>> nets;
+    std::unordered_map<IdString, std::unique_ptr<CellInfo>> cells;
+
+    // Hierarchical (non-leaf) cells by full path
+    std::unordered_map<IdString, HierarchicalCell> hierarchy;
+    // This is the root of the above structure
+    IdString top_module;
+
+    // Aliases for nets, which may have more than one name due to assignments and hierarchy
+    std::unordered_map<IdString, IdString> net_aliases;
+
+    // Top-level ports
+    std::unordered_map<IdString, PortInfo> ports;
+    std::unordered_map<IdString, CellInfo *> port_cells;
+
+    // Floorplanning regions
+    std::unordered_map<IdString, std::unique_ptr<Region>> region;
+
+    // Context meta data
+    std::unordered_map<IdString, Property> attrs;
+
+    Context *as_ctx = nullptr;
+
+    // Has the frontend loaded a design?
+    bool design_loaded;
+
+    BaseCtx()
+    {
+        idstring_str_to_idx = new std::unordered_map<std::string, int>;
+        idstring_idx_to_str = new std::vector<const std::string *>;
+        IdString::initialize_add(this, "", 0);
+        IdString::initialize_arch(this);
+
+        design_loaded = false;
+    }
+
+    virtual ~BaseCtx()
+    {
+        delete idstring_str_to_idx;
+        delete idstring_idx_to_str;
+    }
+
+    // Must be called before performing any mutating changes on the Ctx/Arch.
+    void lock(void)
+    {
+#ifndef NPNR_DISABLE_THREADS
+        mutex.lock();
+        mutex_owner = boost::this_thread::get_id();
+#endif
+    }
+
+    void unlock(void)
+    {
+#ifndef NPNR_DISABLE_THREADS
+        NPNR_ASSERT(boost::this_thread::get_id() == mutex_owner);
+        mutex.unlock();
+#endif
+    }
+
+    // Must be called by the UI before rendering data. This lock will be
+    // prioritized when processing code calls yield().
+    void lock_ui(void)
+    {
+#ifndef NPNR_DISABLE_THREADS
+        ui_mutex.lock();
+        mutex.lock();
+#endif
+    }
+
+    void unlock_ui(void)
+    {
+#ifndef NPNR_DISABLE_THREADS
+        mutex.unlock();
+        ui_mutex.unlock();
+#endif
+    }
+
+    // Yield to UI by unlocking the main mutex, flashing the UI mutex and
+    // relocking the main mutex. Call this when you're performing a
+    // long-standing action while holding a lock to let the UI show
+    // visualization updates.
+    // Must be called with the main lock taken.
+    void yield(void)
+    {
+#ifndef NPNR_DISABLE_THREADS
+        unlock();
+        ui_mutex.lock();
+        ui_mutex.unlock();
+        lock();
+#endif
+    }
+
+    IdString id(const std::string &s) const { return IdString(this, s); }
+
+    IdString id(const char *s) const { return IdString(this, s); }
+
+    Context *getCtx() { return as_ctx; }
+
+    const Context *getCtx() const { return as_ctx; }
+
+    const char *nameOf(IdString name) const { return name.c_str(this); }
+
+    template <typename T> const char *nameOf(const T *obj) const
+    {
+        if (obj == nullptr)
+            return "";
+        return obj->name.c_str(this);
+    }
+
+    const char *nameOfBel(BelId bel) const;
+    const char *nameOfWire(WireId wire) const;
+    const char *nameOfPip(PipId pip) const;
+    const char *nameOfGroup(GroupId group) const;
+
+    // Wrappers of arch functions that take a string and handle IdStringList parsing
+    BelId getBelByNameStr(const std::string &str);
+    WireId getWireByNameStr(const std::string &str);
+    PipId getPipByNameStr(const std::string &str);
+    GroupId getGroupByNameStr(const std::string &str);
+
+    // --------------------------------------------------------------
+
+    bool allUiReload = true;
+    bool frameUiReload = false;
+    std::unordered_set<BelId> belUiReload;
+    std::unordered_set<WireId> wireUiReload;
+    std::unordered_set<PipId> pipUiReload;
+    std::unordered_set<GroupId> groupUiReload;
+
+    void refreshUi() { allUiReload = true; }
+
+    void refreshUiFrame() { frameUiReload = true; }
+
+    void refreshUiBel(BelId bel) { belUiReload.insert(bel); }
+
+    void refreshUiWire(WireId wire) { wireUiReload.insert(wire); }
+
+    void refreshUiPip(PipId pip) { pipUiReload.insert(pip); }
+
+    void refreshUiGroup(GroupId group) { groupUiReload.insert(group); }
+
+    // --------------------------------------------------------------
+
+    NetInfo *getNetByAlias(IdString alias) const
+    {
+        return nets.count(alias) ? nets.at(alias).get() : nets.at(net_aliases.at(alias)).get();
+    }
+
+    // Intended to simplify Python API
+    void addClock(IdString net, float freq);
+    void createRectangularRegion(IdString name, int x0, int y0, int x1, int y1);
+    void addBelToRegion(IdString name, BelId bel);
+    void constrainCellToRegion(IdString cell, IdString region_name);
+
+    // Helper functions for Python bindings
+    NetInfo *createNet(IdString name);
+    void connectPort(IdString net, IdString cell, IdString port);
+    void disconnectPort(IdString cell, IdString port);
+    void ripupNet(IdString name);
+    void lockNetRouting(IdString name);
+
+    CellInfo *createCell(IdString name, IdString type);
+    void copyBelPorts(IdString cell, BelId bel);
+
+    // Workaround for lack of wrappable constructors
+    DecalXY constructDecalXY(DecalId decal, float x, float y);
+
+    void archInfoToAttributes();
+    void attributesToArchInfo();
+};
+
+NEXTPNR_NAMESPACE_END
+
+#endif /* BASECTX_H */