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// Rust garbage collection.
#include <utility>
#include <stdint.h>
#include "rust_internal.h"
#ifdef __WIN32__
#include <windows.h>
#else
#include <dlfcn.h>
#endif
namespace gc {
struct root {
intptr_t frame_offset;
uintptr_t dynamic; // 0 = static, 1 = dynamic
type_desc *tydesc;
};
struct safe_point {
uintptr_t n_roots;
root roots[0];
};
class safe_point_map {
uintptr_t n_safe_points;
const std::pair<void *,const safe_point *> *index;
const safe_point *safe_points;
public:
safe_point_map() {
const uintptr_t *data;
#ifdef __WIN32__
data = (const uintptr_t *)GetProcAddress(GetModuleHandle(NULL),
"rust_gc_safe_points");
#else
data = (const uintptr_t *)dlsym(RTLD_DEFAULT, "rust_gc_safe_points");
#endif
n_safe_points = *data++;
index = (const std::pair<void *,const safe_point *> *)data;
data += n_safe_points * 2;
safe_points = (const safe_point *)data;
}
};
void
gc() {
safe_point_map map;
// TODO
}
void
maybe_gc() {
// FIXME: We ought to lock this.
static int zeal = -1;
if (zeal == -1) {
char *ev = getenv("RUST_GC_ZEAL");
zeal = ev[0] != '\0' && ev[0] != '0';
}
if (zeal)
gc();
}
}
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