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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
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*
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* 2 along with this work; if not, write to the Free Software Foundation,
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#ifndef SHARE_VM_CI_CICALLPROFILE_HPP
#define SHARE_VM_CI_CICALLPROFILE_HPP
#include "ci/ciClassList.hpp"
#include "memory/allocation.hpp"
// ciCallProfile
//
// This class is used to determine the frequently called method
// at some call site
class ciCallProfile : StackObj {
private:
// Fields are initialized directly by ciMethod::call_profile_at_bci.
friend class ciMethod;
friend class ciMethodHandle;
enum { MorphismLimit = 2 }; // Max call site's morphism we care about
int _limit; // number of receivers have been determined
int _morphism; // determined call site's morphism
int _count; // # times has this call been executed
int _receiver_count[MorphismLimit + 1]; // # times receivers have been seen
ciMethod* _method[MorphismLimit + 1]; // receivers methods
ciKlass* _receiver[MorphismLimit + 1]; // receivers (exact)
ciCallProfile() {
_limit = 0;
_morphism = 0;
_count = -1;
_receiver_count[0] = -1;
_method[0] = NULL;
_receiver[0] = NULL;
}
void add_receiver(ciKlass* receiver, int receiver_count);
public:
// Note: The following predicates return false for invalid profiles:
bool has_receiver(int i) const { return _limit > i; }
int morphism() const { return _morphism; }
int count() const { return _count; }
int receiver_count(int i) {
assert(i < _limit, "out of Call Profile MorphismLimit");
return _receiver_count[i];
}
float receiver_prob(int i) {
assert(i < _limit, "out of Call Profile MorphismLimit");
return (float)_receiver_count[i]/(float)_count;
}
ciMethod* method(int i) {
assert(i < _limit, "out of Call Profile MorphismLimit");
return _method[i];
}
ciKlass* receiver(int i) {
assert(i < _limit, "out of Call Profile MorphismLimit");
return _receiver[i];
}
// Rescale the current profile based on the incoming scale
ciCallProfile rescale(double scale) {
assert(scale >= 0 && scale <= 1.0, "out of range");
ciCallProfile call = *this;
call._count = (int)(call._count * scale);
for (int i = 0; i < _morphism; i++) {
call._receiver_count[i] = (int)(call._receiver_count[i] * scale);
}
return call;
}
};
#endif // SHARE_VM_CI_CICALLPROFILE_HPP