#ifndef SHARE_VM_RUNTIME_SIMPLETHRESHOLDPOLICY_HPP

#define SHARE_VM_RUNTIME_SIMPLETHRESHOLDPOLICY_HPP

#include "code/nmethod.hpp"

#include "oops/methodDataOop.hpp"

#include "runtime/compilationPolicy.hpp"

#include "utilities/globalDefinitions.hpp"

class CompileTask;

class CompileQueue;

class SimpleThresholdPolicy : public CompilationPolicy {

int _c1_count, _c2_count;

// Check if the counter is big enough and set carry (effectively infinity).

inline void set_carry_if_necessary(InvocationCounter *counter);

// Set carry flags in the counters (in methodOop and MDO).

inline void handle_counter_overflow(methodOop method);

// Call and loop predicates determine whether a transition to a higher compilation

// level should be performed (pointers to predicate functions are passed to common_TF().

// Predicates also take compiler load into account.

typedef bool (SimpleThresholdPolicy::*Predicate)(int i, int b, CompLevel cur_level);

bool call_predicate(int i, int b, CompLevel cur_level);

bool loop_predicate(int i, int b, CompLevel cur_level);

// Common transition function. Given a predicate determines if a method should transition to another level.

CompLevel common(Predicate p, methodOop method, CompLevel cur_level);

// Transition functions.

// call_event determines if a method should be compiled at a different

// level with a regular invocation entry.

CompLevel call_event(methodOop method, CompLevel cur_level);

// loop_event checks if a method should be OSR compiled at a different

// level.

CompLevel loop_event(methodOop method, CompLevel cur_level);

void print_counters(const char* prefix, methodHandle mh);

protected:

int c1_count() const { return _c1_count; }

int c2_count() const { return _c2_count; }

void set_c1_count(int x) { _c1_count = x; }

void set_c2_count(int x) { _c2_count = x; }

enum EventType { CALL, LOOP, COMPILE, REMOVE_FROM_QUEUE, UPDATE_IN_QUEUE, REPROFILE, MAKE_NOT_ENTRANT };

void print_event(EventType type, methodHandle mh, methodHandle imh, int bci, CompLevel level);

// Print policy-specific information if necessary

virtual void print_specific(EventType type, methodHandle mh, methodHandle imh, int bci, CompLevel level) { }

// Check if the method can be compiled, change level if necessary

void compile(methodHandle mh, int bci, CompLevel level, JavaThread* thread);

// Submit a given method for compilation

virtual void submit_compile(methodHandle mh, int bci, CompLevel level, JavaThread* thread);

// Simple methods are as good being compiled with C1 as C2.

// This function tells if it's such a function.

inline bool is_trivial(methodOop method);

// Predicate helpers are used by .*_predicate() methods as well as others.

// They check the given counter values, multiplied by the scale against the thresholds.

template<CompLevel level> static inline bool call_predicate_helper(int i, int b, double scale);

template<CompLevel level> static inline bool loop_predicate_helper(int i, int b, double scale);

// Get a compilation level for a given method.

static CompLevel comp_level(methodOop method) {

nmethod *nm = method->code();

if (nm != NULL && nm->is_in_use()) {

return (CompLevel)nm->comp_level();

}

return CompLevel_none;

}

virtual void method_invocation_event(methodHandle method, methodHandle inlinee,

CompLevel level, nmethod* nm, JavaThread* thread);

virtual void method_back_branch_event(methodHandle method, methodHandle inlinee,

int bci, CompLevel level, nmethod* nm, JavaThread* thread);

public:

SimpleThresholdPolicy() : _c1_count(0), _c2_count(0) { }

virtual int compiler_count(CompLevel comp_level) {

if (is_c1_compile(comp_level)) return c1_count();

if (is_c2_compile(comp_level)) return c2_count();

return 0;

}

virtual CompLevel initial_compile_level() { return MIN2((CompLevel)TieredStopAtLevel, CompLevel_initial_compile); }

virtual void do_safepoint_work() { }

virtual void delay_compilation(methodOop method) { }

virtual void disable_compilation(methodOop method) { }

virtual void reprofile(ScopeDesc* trap_scope, bool is_osr);

virtual nmethod* event(methodHandle method, methodHandle inlinee,

int branch_bci, int bci, CompLevel comp_level, nmethod* nm, JavaThread* thread);

// Select task is called by CompileBroker. We should return a task or NULL.

virtual CompileTask* select_task(CompileQueue* compile_queue);

// Tell the runtime if we think a given method is adequately profiled.

virtual bool is_mature(methodOop method);

// Initialize: set compiler thread count

virtual void initialize();

virtual bool should_not_inline(ciEnv* env, ciMethod* callee) {

return (env->comp_level() == CompLevel_limited_profile ||

env->comp_level() == CompLevel_full_profile) &&

callee->has_loops();

}

};

#endif // SHARE_VM_RUNTIME_SIMPLETHRESHOLDPOLICY_HPP