Split nextpnr.h to allow for linear inclusion.

"nextpnr.h" is no longer the god header.  Important improvements:

 - Functions in log.h can be used without including
   BaseCtx/Arch/Context. This means that log_X functions can be called
   without included "nextpnr.h"

 - NPNR_ASSERT can be used without including "nextpnr.h" by including
   "nextpnr_assertions.h".  This allows NPNR_ASSERT to be used safely in
   any header file.

 - Types defined in "archdefs.h" are now available without including
   BaseCtx/Arch/Context.  This means that utility classes that will be
   used inside of BaseCtx/Arch/Context can be defined safely in a
   self-contained header.

Signed-off-by: Keith Rothman <537074+litghost@users.noreply.github.com>

2 files changed, 22 insertions, 7 deletions

diff --git a/gowin/arch.h b/gowin/arch.h
index e0686d1c..0f975f77 100644
--- a/gowin/arch.h
+++ b/gowin/arch.h
@@ -18,9 +18,18 @@
  *
  */
 
-#ifndef NEXTPNR_H
-#error Include "arch.h" via "nextpnr.h" only.
-#endif
+#ifndef GOWIN_ARCH_H
+#define GOWIN_ARCH_H
+
+#include <cstdint>
+#include <map>
+#include <string>
+#include <vector>
+
+#include "base_arch.h"
+#include "idstring.h"
+#include "nextpnr_namespaces.h"
+#include "nextpnr_types.h"
 
 NEXTPNR_NAMESPACE_BEGIN
 
@@ -40,7 +49,7 @@ template <typename T> struct RelPtr
         return const_cast<T *>(reinterpret_cast<const T *>(reinterpret_cast<const char *>(this) + offset));
     }
 
-    const T &operator[](size_t index) const { return get()[index]; }
+    const T &operator[](std::size_t index) const { return get()[index]; }
 
     const T &operator*() const { return *(get()); }
 
@@ -453,3 +462,5 @@ struct Arch : BaseArch<ArchRanges>
 };
 
 NEXTPNR_NAMESPACE_END
+
+#endif /* GOWIN_ARCH_H */
diff --git a/gowin/archdefs.h b/gowin/archdefs.h
index 963660c6..ef297d41 100644
--- a/gowin/archdefs.h
+++ b/gowin/archdefs.h
@@ -18,9 +18,11 @@
  *
  */
 
-#ifndef NEXTPNR_H
-#error Include "archdefs.h" via "nextpnr.h" only.
-#endif
+#ifndef GOWIN_ARCHDEFS_H
+#define GOWIN_ARCHDEFS_H
+
+#include "idstring.h"
+#include "nextpnr_namespaces.h"
 
 NEXTPNR_NAMESPACE_BEGIN
 
@@ -68,3 +70,5 @@ struct ArchCellInfo
 };
 
 NEXTPNR_NAMESPACE_END
+
+#endif /* GOWIN_ARCHDEFS_H */