initial upload

1 files changed, 71 insertions, 0 deletions

diff --git a/source/state.cpp b/source/state.cpp
new file mode 100644
index 0000000..27d624c
--- /dev/null
+++ b/source/state.cpp
@@ -0,0 +1,71 @@
+// sprit-forth: A portable subroutine-threaded Forth.
+// Copyright (C) 2023  Clyne Sullivan <clyne@bitgloo.com>
+//
+// This library is free software; you can redistribute it and/or modify it
+// under the terms of the GNU Library General Public License as published by
+// the Free Software Foundation; either version 2 of the License, or (at your
+// option) any later version.
+//
+// This library is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+// FOR A PARTICULAR PURPOSE.  See the GNU Library General Public License for
+// more details.
+//
+// You should have received a copy of the GNU Library General Public License
+// along with this library; if not, write to the Free Software Foundation, Inc.,
+// 51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA.
+
+#include "core.hpp"
+#include "state.hpp"
+
+//#include <csetjmp>
+#include <cstring>
+
+//static std::jmp_buf jmpbuf;
+Cell *SP = DICT.data() + DICT.size() - DS;
+Cell *RP = DICT.data() + DICT.size() - DS - RS;
+FuncList IP = nullptr;
+
+std::array<Cell, 2048> DICT;
+
+Cell& HERE   = DICT[DIdxHere];
+Cell& LATEST = DICT[DIdxLatest];
+Cell& STATE  = DICT[DIdxState];
+
+void executor(FuncList *list)
+{
+    /*if (setjmp(jmpbuf) == 0)*/ {
+        // Execute the first bit of "word".
+        // If it is a "WordWrap", it will exit without changing IP.
+        // If it is a defined word, IP will be set to the word's body.
+        auto ip = (FuncList)list;
+        auto po = (void (**)(FuncList))*ip;
+        // Pass in po's location so the call can fetch beyond itself.
+        (*po)((FuncList)*ip);
+
+        while (IP) {
+            ++IP;
+            auto po = (void (**)(FuncList))*IP;
+            (*po)((FuncList)*IP);
+        }
+
+        //std::longjmp(jmpbuf, 1);
+    }
+}
+
+void execute1(Word *word)
+{
+    IP = 0;
+    executor(&word->list);
+}
+
+Word *find(const char *s, int len)
+{
+    for (auto w = (Word *)LATEST; w; w = w->link) {
+        if (len == (int)strlen(w->name) && strncmp(s, w->name, len) == 0)
+            return w;
+    }
+
+    return nullptr;
+}
+