public override IEnumerable <ProofState> EvalInit(Statement statement, ProofState state0)
{
state0.InAsserstion = true;
Func <ProofState, IEnumerable <ProofState> > tassertFramePatch =
ps => {
bool dummy;
//set partial so that the assert-assume frame can be popped
this.IsPartial = true;
this._pass = true;
ps.MarkCurFrameAsTerminated(false, out dummy);
return(ps.ApplyPatch());// this will call the parent patch handler
};
var dummyBody = new List <Statement> {
statement
};
InitBasicFrameCtrl(dummyBody, false, null, VerifyN, tassertFramePatch);
state0.AddNewFrame(this);
var assertFrame = new DefaultTacticFrameCtrl();
Func <ProofState, IEnumerable <ProofState> > assertFramePatch =
ps =>
{
bool dummy;
//set partial so that the assert-assume frame can be popped
assertFrame.IsPartial = true;
ps.MarkCurFrameAsTerminated(false, out dummy);
return(ps.ApplyPatch());// this will call the patch handler in tassert
};
assertFrame.InitBasicFrameCtrl(dummyBody, false, null, VerifyN, tassertFramePatch);
assertFrame.IncCounter();
state0.AddNewFrame(assertFrame);
var st = SimpExpr.SimpTacticExpr(state0, (statement as TacticAssertStmt).Expr);
// insert the simplified assert, followed by assume false so that the prover don't need to worry about the
// upcoming vcs.
var asserts = new List <Statement>();
asserts.Add(
new AssertStmt(new Token(TacnyDriver.TacticCodeTokLine, 0)
{
val = "assert"
},
new Token(TacnyDriver.TacticCodeTokLine, 0)
{
val = ";"
}, st, null, null));
asserts.Add(
new AssumeStmt(new Token(TacnyDriver.TacticCodeTokLine, 0)
{
val = "assume"
},
new Token(TacnyDriver.TacticCodeTokLine, 0)
{
val = ";"
},
new Microsoft.Dafny.LiteralExpr(new Token(TacnyDriver.TacticCodeTokLine, 0)
{
val = "false"
}, false),
null));
state0.AddStatements(asserts);
state0.NeedVerify = true;
yield return(state0);
}
