diff options
Diffstat (limited to 'Source/VCGeneration/Wlp.cs')
-rw-r--r-- | Source/VCGeneration/Wlp.cs | 36 |
1 files changed, 30 insertions, 6 deletions
diff --git a/Source/VCGeneration/Wlp.cs b/Source/VCGeneration/Wlp.cs index b4ee4c09..508a1400 100644 --- a/Source/VCGeneration/Wlp.cs +++ b/Source/VCGeneration/Wlp.cs @@ -48,7 +48,7 @@ namespace VC { public class Wlp { - public static VCExpr Block(Block b, VCExpr N, VCContext ctxt) + public static VCExpr Block(Block b, VCExpr N, VCContext ctxt, IList<VCExprVar> namedAssumeVars = null) //modifies ctxt.*; { Contract.Requires(b != null); @@ -63,7 +63,7 @@ namespace VC { for (int i = b.Cmds.Count; --i >= 0; ) { - res = Cmd(b, cce.NonNull( b.Cmds[i]), res, ctxt); + res = Cmd(b, cce.NonNull( b.Cmds[i]), res, ctxt, namedAssumeVars); } int id = b.UniqueId; @@ -87,7 +87,7 @@ namespace VC { /// <summary> /// Computes the wlp for an assert or assume command "cmd". /// </summary> - public static VCExpr Cmd(Block b, Cmd cmd, VCExpr N, VCContext ctxt) { + internal static VCExpr Cmd(Block b, Cmd cmd, VCExpr N, VCContext ctxt, IList<VCExprVar> namedAssumeVars = null) { Contract.Requires(cmd != null); Contract.Requires(N != null); Contract.Requires(ctxt != null); @@ -186,17 +186,41 @@ namespace VC { if (naryExpr.Fun is FunctionCall) { int id = ac.UniqueId; ctxt.Label2absy[id] = ac; - return gen.ImpliesSimp(gen.LabelPos(cce.NonNull("si_fcall_" + id.ToString()), ctxt.Ctxt.BoogieExprTranslator.Translate(ac.Expr)), N); + return MaybeWrapWithOptimization(ctxt, gen, ac.Attributes, gen.ImpliesSimp(gen.LabelPos(cce.NonNull("si_fcall_" + id.ToString()), ctxt.Ctxt.BoogieExprTranslator.Translate(ac.Expr)), N)); } } } - return gen.ImpliesSimp(ctxt.Ctxt.BoogieExprTranslator.Translate(ac.Expr), N); + var expr = ctxt.Ctxt.BoogieExprTranslator.Translate(ac.Expr); + + var aid = QKeyValue.FindStringAttribute(ac.Attributes, "id"); + if (CommandLineOptions.Clo.PrintNecessaryAssumes && aid != null && namedAssumeVars != null) + { + var v = gen.Variable("assume$$" + aid, Microsoft.Boogie.Type.Bool); + namedAssumeVars.Add(v); + expr = gen.ImpliesSimp(v, expr); + } + return MaybeWrapWithOptimization(ctxt, gen, ac.Attributes, gen.ImpliesSimp(expr, N)); } else { Console.WriteLine(cmd.ToString()); Contract.Assert(false); throw new cce.UnreachableException(); // unexpected command } } - + + private static VCExpr MaybeWrapWithOptimization(VCContext ctxt, VCExpressionGenerator gen, QKeyValue attrs, VCExpr expr) + { + var min = QKeyValue.FindExprAttribute(attrs, "minimize"); + if (min != null) + { + expr = gen.Function(VCExpressionGenerator.MinimizeOp, ctxt.Ctxt.BoogieExprTranslator.Translate(min), expr); + } + var max = QKeyValue.FindExprAttribute(attrs, "maximize"); + if (max != null) + { + expr = gen.Function(VCExpressionGenerator.MaximizeOp, ctxt.Ctxt.BoogieExprTranslator.Translate(max), expr); + } + return expr; + } + public static CommandLineOptions.SubsumptionOption Subsumption(AssertCmd ac) { Contract.Requires(ac != null); int n = QKeyValue.FindIntAttribute(ac.Attributes, "subsumption", -1); |