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global_cache.hpp
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global_cache.hpp
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#ifndef RBX_VM_GLOBAL_CACHE_HPP
#define RBX_VM_GLOBAL_CACHE_HPP
#include "vm/oop.hpp"
#include "vm/object_utils.hpp"
#include "builtin/compiledmethod.hpp"
namespace rubinius {
#define CPU_CACHE_SIZE 0x1000
#define CPU_CACHE_MASK 0xfff
#define CPU_CACHE_HASH(c,m) ((((uintptr_t)(c)>>3)^((uintptr_t)m)) & CPU_CACHE_MASK)
struct LookupData;
class Dispatch;
class GlobalCache {
public:
struct cache_entry {
Module* klass;
Symbol* name;
Module* module;
Executable* method;
bool is_public;
bool method_missing;
};
struct cache_entry entries[CPU_CACHE_SIZE];
public:
static bool resolve(STATE, Symbol* name, Dispatch& msg, LookupData& lookup);
GlobalCache() {
clear();
}
/** @todo This does NOT handle null? --rue */
struct cache_entry* lookup(Module* cls, Symbol* name) {
struct cache_entry* entry;
entry = entries + CPU_CACHE_HASH(cls, name);
if(entry->name == name && entry->klass == cls) {
return entry;
}
return NULL;
}
void clear() {
for(size_t i = 0; i < CPU_CACHE_SIZE; i++) {
entries[i].klass = 0;
entries[i].name = 0;
entries[i].module = 0;
entries[i].method = 0;
entries[i].is_public = true;
entries[i].method_missing = false;
}
}
void clear(Symbol* name) {
for(size_t i = 0; i < CPU_CACHE_SIZE; i++) {
if(entries[i].name == name) {
entries[i].klass = NULL;
entries[i].name = NULL;
entries[i].module = NULL;
entries[i].method = NULL;
entries[i].method_missing = false;
}
}
}
void clear(Module* cls, Symbol* name) {
struct cache_entry* entry;
entry = entries + CPU_CACHE_HASH(cls, name);
if(entry->name == name && entry->klass == cls) {
entry->klass = NULL;
entry->name = NULL;
entry->module = NULL;
entry->method = NULL;
entry->method_missing = false;
}
}
void prune_young();
void prune_unmarked(int mark);
void retain(STATE, Module* cls, Symbol* name, Module* mod, Executable* meth,
bool missing, bool was_private = false) {
struct cache_entry* entry;
entry = entries + CPU_CACHE_HASH(cls, name);
entry->klass = cls;
entry->name = name;
entry->module = mod;
entry->method_missing = missing;
entry->method = meth;
entry->is_public = !was_private;
}
};
};
#endif