initial upload

1 files changed, 85 insertions, 0 deletions

diff --git a/source/types.hpp b/source/types.hpp
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+++ b/source/types.hpp
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+// 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.
+
+#ifndef TYPES_HPP
+#define TYPES_HPP
+
+#include <array>
+#include <cstddef>
+#include <cstdint>
+
+using Cell = intptr_t;
+using Addr = uintptr_t;
+using Func = void (*)();
+using FuncList = Func const *;
+
+static_assert(sizeof(Cell) == sizeof(Addr));
+static_assert(sizeof(Cell) == sizeof(Func));
+
+struct Word {
+    FuncList list;
+    const char *name;
+    Word *link = nullptr;
+    Cell imm = 0;
+
+    constexpr Word(const char *n, FuncList l):
+        list(l), name(n) {}
+
+    constexpr Word& markImmediate() noexcept {
+        imm = -1;
+        return *this;
+    }
+
+    constexpr bool immediate() const noexcept {
+        return imm;
+    }
+};
+
+static_assert(offsetof(Word, list) == 0);
+static_assert(offsetof(Word, name) == 1 * sizeof(Cell));
+static_assert(offsetof(Word, link) == 2 * sizeof(Cell));
+static_assert(offsetof(Word, imm)  == 3 * sizeof(Cell));
+static_assert(sizeof(Word)         == 4 * sizeof(Cell));
+
+template<typename... Words>
+struct WordSet
+{
+    std::array<Word, sizeof...(Words)> words;
+    Word *latest;
+
+    constexpr WordSet(Words... ws):
+        words {ws...}
+    {
+        auto it = words.begin();
+        while (++it != words.end())
+            it->link = it - 1;
+
+        latest = &*words.rbegin();
+    }
+};
+
+template<auto... funcs>
+auto WordWrap = [] {
+    constexpr static Func list[1] = {
+        +[] { (funcs(), ...); }
+    };
+
+    return list;
+};
+
+#endif // TYPES_HPP
+