xo-interpreter: handle define-expressions.

xo-interpreter/src/interpreter/VsmStackFrame.cpp

@@ -0,0 +1,148 @@
+/** @file VsmStackFrame.cpp
+ *
+ *  @author Roland Conybeare, Nov 2025
+ **/
+
+#include "VsmStackFrame.hpp"
+#include "xo/reflect/Reflect.hpp"
+#include "xo/reflect/StructReflector.hpp"
+
+namespace xo {
+    using xo::reflect::Reflect;
+    using xo::reflect::StructReflector;
+    using xo::reflect::TypeDescrW;
+    using xo::reflect::TaggedPtr;
+    using xo::reflect::TypeDescrExtra;
+    using xo::reflect::EstablishTypeDescr;
+    using xo::reflect::StlVectorTdx;
+
+    namespace scm {
+        namespace {
+            // TOOD: move into CVector
+
+            std::size_t
+            slot_array_size(std::size_t n) {
+                return n * sizeof(gp<Object>);
+            }
+        }
+
+        VsmStackFrame::VsmStackFrame(gc::IAlloc * mm,
+                                     gp<VsmStackFrame> p,
+                                     std::size_t n,
+                                     const VsmInstr * cont) : parent_{p},
+                                                              slot_v_{mm, n},
+                                                              cont_{cont}
+        {}
+
+        gp<VsmStackFrame>
+        VsmStackFrame::push1(gc::IAlloc * mm,
+                             gp<VsmStackFrame> p,
+                             gp<Object> s0,
+                             const VsmInstr * cont)
+        {
+            gp<VsmStackFrame> retval = new (MMPtr(mm)) VsmStackFrame(mm, p, 1, cont);
+
+            (*retval)[0] = s0;
+
+            return retval;
+        }
+
+        TaggedPtr
+        VsmStackFrame::self_tp() const
+        {
+            return Reflect::make_tp(const_cast<VsmStackFrame *>(this));
+        }
+
+        void
+        VsmStackFrame::display(std::ostream & os) const
+        {
+            os << "<vsm-stack-frame"
+               << xtag("n", slot_v_.size());
+
+#ifdef NOT_YET
+            for (std::size_t i = 0, n = n_slot(); i < n; ++i) {
+                char buf[24];
+                snprintf(buf, sizeof(buf), "v[%lu]", i);
+
+                os << xtag(buf, lookup(i));
+            }
+#endif
+
+            os << ">";
+        }
+
+        std::size_t
+        VsmStackFrame::_shallow_size() const
+        {
+            std::size_t retval = sizeof(VsmStackFrame);
+
+            retval += gc::IAlloc::with_padding(slot_array_size(slot_v_.size()));
+
+            return retval;
+        }
+
+        Object *
+        VsmStackFrame::_shallow_copy(gc::IAlloc * mm) const
+        {
+            Cpof cpof(mm, this);
+
+            size_t n = this->size();
+
+            VsmStackFrame * copy = new (cpof) VsmStackFrame(cpof.mm_, parent_, n, cont_);
+
+            void * v_dest = copy->slot_v_.v_;
+
+            if (slot_v_.v_) {
+                ::memcpy(v_dest, slot_v_.v_, slot_array_size(n));
+            }
+
+#ifdef OBSOLETE
+            for (size_t i = 0, n = n_slot_; i < n; ++i) {
+                copy->v_[i] = v_[i];
+            }
+#endif
+            return copy;
+        }
+
+        std::size_t
+        VsmStackFrame::_forward_children(gc::IAlloc * gc)
+        {
+            Object::_forward_inplace(parent_, gc);
+
+            for (std::size_t i = 0, n = slot_v_.size(); i < n; ++i) {
+                Object::_forward_inplace((*this)[i], gc);
+            }
+
+            return _shallow_size();
+        }
+
+        void
+        VsmStackFrame::reflect_self()
+        {
+            StructReflector<VsmStackFrame> sr;
+
+            if (sr.is_incomplete() ) {
+                /* reflect CVector<gp<Object>>.
+                 * duplicates similar code in LocalEnv::reflect_self()
+                 */
+                using VectorType = CVector<gp<Object>>;
+
+                /* custom reflection for array of Object pointers.
+                 * Can use StlVectorTdx here, treating CVector<T> as a vector
+                 * via .size() and .operator[] members
+                 */
+                std::unique_ptr<TypeDescrExtra> tdx1
+                    = std::make_unique<StlVectorTdx<VectorType>>();
+                TypeDescrW td1
+                    = EstablishTypeDescr::establish<VectorType>();
+                td1->assign_tdextra(Reflect::get_final_invoker<VectorType>(),
+                                    std::move(tdx1));
+
+                REFLECT_MEMBER(sr, parent);
+                REFLECT_MEMBER(sr, slot_v);
+            }
+        }
+    } /*namespace scm*/
+} /*namespace xo*/
+
+/* end VsmStackFrame.cpp */