// Copyright 2015 syzkaller project authors. All rights reserved.
// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.

package prog

import (
	"math/rand"
)

// Generate generates a random program of length ~ncalls.
// calls is a set of allowed syscalls, if nil all syscalls are used.
func (target *Target) Generate(rs rand.Source, ncalls int, ct *ChoiceTable) *Prog {
	p := &Prog{
		Target: target,
	}
	r := newRand(target, rs)
	s := newState(target, ct)
	for len(p.Calls) < ncalls {
		calls := r.generateCall(s, p)
		for _, c := range calls {
			s.analyze(c)
			p.Calls = append(p.Calls, c)
		}
	}
	if debug {
		if err := p.validate(); err != nil {
			panic(err)
		}
	}
	return p
}