120 lines
2.9 KiB
C++
120 lines
2.9 KiB
C++
/** @file StackFrame.cpp **/
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#include "StackFrame.hpp"
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#include "xo/reflect/Reflect.hpp"
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#include "xo/reflect/StructReflector.hpp"
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#include <cstring>
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namespace xo {
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using xo::reflect::Reflect;
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using xo::reflect::StructReflector;
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using xo::reflect::TaggedPtr;
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using xo::print::quot;
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namespace scm {
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namespace {
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std::size_t
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slot_array_size(std::size_t n) {
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return n * sizeof(gp<Object>);
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}
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}
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StackFrame::StackFrame(gc::IAlloc * mm, std::size_t n_slot)
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: n_slot_{n_slot}, v_{nullptr}
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{
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if (n_slot > 0) {
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std::byte * mem = mm->alloc(slot_array_size(n_slot));
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this->v_ = new (mem) gp<Object>[n_slot];
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}
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}
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gp<StackFrame>
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StackFrame::make(gc::IAlloc * mm, std::size_t n_slot)
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{
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return new (MMPtr(mm)) StackFrame(mm, n_slot);
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}
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TaggedPtr
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StackFrame::self_tp() const
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{
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return Reflect::make_tp(const_cast<StackFrame *>(this));
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}
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void
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StackFrame::display(std::ostream & os) const
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{
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os << "<stack-frame"
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<< xtag("n_slot", n_slot_);
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#ifdef NOT_YET
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for (std::size_t i = 0, n = n_slot(); i < n; ++i) {
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char buf[24];
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snprintf(buf, sizeof(buf), "v[%lu]", i);
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os << xtag(buf, lookup(i));
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}
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#endif
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os << ">";
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}
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std::size_t
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StackFrame::_shallow_size() const
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{
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std::size_t retval = sizeof(StackFrame);
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retval += gc::IAlloc::with_padding(slot_array_size(n_slot_));
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return retval;
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}
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Object *
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StackFrame::_shallow_copy() const
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{
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Cpof cpof(Object::mm, this);
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StackFrame * copy = new (cpof) StackFrame(cpof.mm_, n_slot_);
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void * v_dest = copy->v_;
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if (v_) {
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::memcpy(v_dest, v_, slot_array_size(n_slot_));
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}
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#ifdef OBSOLETE
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for (size_t i = 0, n = n_slot_; i < n; ++i) {
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copy->v_[i] = v_[i];
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}
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#endif
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return copy;
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}
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std::size_t
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StackFrame::_forward_children()
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{
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for (std::size_t i = 0, n = n_slot_; i < n; ++i) {
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Object::_forward_inplace(lookup(i));
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}
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return _shallow_size();
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}
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void
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StackFrame::reflect_self()
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{
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StructReflector<StackFrame> sr;
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if (sr.is_incomplete()) {
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REFLECT_MEMBER(sr, n_slot);
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// non-trivial to reflect frame members,
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// effectively need separate reflection for each cardinality;
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// or: reflect .v_[] as nested element
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}
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}
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} /*namespace scm*/
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} /*namespace xo*/
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/* end StackFrame.cpp */
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