55 lines
1.2 KiB
C++
55 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 segment *gc_locals_region;
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extern cell gc_locals;
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DEFPUSHPOP(gc_local_,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_local_push((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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cell old = gc_local_pop();
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assert(old == (cell)this);
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#else
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gc_local_pop();
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#endif
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}
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};
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/* A similar hack for the bignum implementation */
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extern segment *gc_bignums_region;
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extern cell gc_bignums;
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DEFPUSHPOP(gc_bignum_,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_bignum_push((cell)addr);
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}
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~gc_bignum() { assert((cell)addr == gc_bignum_pop()); }
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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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