initial commit

1 files changed, 49 insertions, 0 deletions

diff --git a/prog/clone.go b/prog/clone.go
new file mode 100644
index 000000000..dd8e6e4db
--- /dev/null
+++ b/prog/clone.go
@@ -0,0 +1,49 @@
+// 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
+
+func (p *Prog) Clone() *Prog {
+	p1 := new(Prog)
+	newargs := make(map[*Arg]*Arg)
+	for _, c := range p.Calls {
+		c1 := new(Call)
+		c1.Meta = c.Meta
+		c1.Ret = c.Ret.clone(c1, newargs)
+		for _, arg := range c.Args {
+			c1.Args = append(c1.Args, arg.clone(c1, newargs))
+		}
+		p1.Calls = append(p1.Calls, c1)
+	}
+	if err := p1.validate(); err != nil {
+		panic(err)
+	}
+	return p1
+}
+
+func (arg *Arg) clone(c *Call, newargs map[*Arg]*Arg) *Arg {
+	arg1 := new(Arg)
+	*arg1 = *arg
+	arg1.Call = c
+	arg1.Data = append([]byte{}, arg.Data...)
+	switch arg.Kind {
+	case ArgPointer:
+		if arg.Res != nil {
+			arg1.Res = arg.Res.clone(c, newargs)
+		}
+	case ArgResult:
+		r := newargs[arg.Res]
+		arg1.Res = r
+		if r.Uses == nil {
+			r.Uses = make(map[*Arg]bool)
+		}
+		r.Uses[arg1] = true
+	}
+	arg1.Inner = nil
+	for _, arg2 := range arg.Inner {
+		arg1.Inner = append(arg1.Inner, arg2.clone(c, newargs))
+	}
+	arg1.Uses = nil // filled when we clone the referent
+	newargs[arg] = arg1
+	return arg1
+}