52 lines
1.2 KiB
C++
52 lines
1.2 KiB
C++
namespace factor
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{
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/* If a runtime function needs to call another function which potentially
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allocates memory, it must wrap any local variable references to Factor
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objects in gc_root instances */
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extern std::vector<cell> gc_locals;
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template <typename T>
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struct gc_root : public tagged<T>
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{
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void push() { check_tagged_pointer(tagged<T>::value()); gc_locals.push_back((cell)this); }
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explicit gc_root(cell value_) : tagged<T>(value_) { push(); }
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explicit gc_root(T *value_) : tagged<T>(value_) { push(); }
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const gc_root<T>& operator=(const T *x) { tagged<T>::operator=(x); return *this; }
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const gc_root<T>& operator=(const cell &x) { tagged<T>::operator=(x); return *this; }
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~gc_root() {
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#ifdef FACTOR_DEBUG
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assert(gc_locals.back() == (cell)this);
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#endif
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gc_locals.pop_back();
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}
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};
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/* A similar hack for the bignum implementation */
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extern std::vector<cell> gc_bignums;
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struct gc_bignum
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{
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bignum **addr;
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gc_bignum(bignum **addr_) : addr(addr_) {
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if(*addr_)
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check_data_pointer(*addr_);
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gc_bignums.push_back((cell)addr);
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}
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~gc_bignum() {
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#ifdef FACTOR_DEBUG
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assert(gc_bignums.back() == (cell)addr);
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#endif
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gc_bignums.pop_back();
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}
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};
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#define GC_BIGNUM(x) gc_bignum x##__gc_root(&x)
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}
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