public TypeApply Compile_Function(Function function, Dictionary <TypeParameter, Type> typeArgs)
{
Dictionary <string, TypeParameter> substArgs = new Dictionary <string, TypeParameter>();
function.TypeArgs.ForEach(t => substArgs.Add(t.Name, t));
typeArgs = typeArgs.ToDictionary(p => substArgs[p.Key.Name], p => p.Value);
TypeApply apply = new TypeApply(this, DafnySpec.SanitizedName(function), function.TypeArgs, typeArgs);
if (!compileFunctions.ContainsKey(apply))
{
compileFunctions.Add(apply, apply);
var tok = function.tok;
//Console.Error.WriteLine("function: " + function + " :: " + function.GetType());
//Console.Error.WriteLine(" " + function.Body);
//Console.Error.WriteLine(" " + function.IsRecursive + " " + function.IsGhost);
var writers = ChooseWriter(tok, function.Name, apply);
if (!Attributes.Contains(function.Attributes, "imported"))
{
try
{
var compile = new CompileFunction(this, function, apply, writers.Item1, writers.Item2,
writers.Item3, writers.Item4);
if (writers.Item3 == "Seq" && typeArgs.Count == 1)
{
compile.visibleElementType = new List <Type>(apply.typeArgs.Values)[0];
}
compile.minVerify = minVerify;
compile.Compile();
}
catch (Exception e)
{
throw new Exception("while compiling function " + function.Name, e);
}
}
else
{
// imported
if (function.Ens.Count > 0)
{
string name = FunName(SimpleName(apply.AppName()));
AddLemma(new LemmaCall(writers.Item3, (Type)null,
"call lemma_fun_ensures_" + name + "();", false));
}
}
bool hidden = Attributes.Contains(function.Attributes, "opaque");
bool isFull = function.Name.Contains("#") && function.Name.EndsWith("_FULL");
if (!function.IsGhost && !isFull && !IsSpecFile(function.tok.filename))
{
Compile_FunctionAsMethod(function, typeArgs, substArgs);
}
}
return(apply);
}
public void CompileDatatype1Ghost(Type t, TypeApply app, TextWriter writer, TextWriter iwriter)
{
// type List = Nil() | Cons(hd:int, tl:List);
string dataName = app.AppName(); // List
List <DatatypeCtor> ctors = compileDatatypes[app].AsDatatype.Ctors;
bool isSeq = dataName.StartsWith("Seq_");
if (isSeq)
{
iwriter.WriteLine("type " + dataName + ";");
}
(isSeq ? writer : iwriter).WriteLine(
"type " + (isSeq ? "implementation" : "") + "{:overload} " + dataName + " = "
+ String.Join(" | ", ctors.Select(c => Compile_Constructor(t, c.Name, app.typeArgs).AppName() + "("
+ String.Join(", ", c.Formals.Select(f => f.Name + ":" + TypeString(app.AppType(f.Type))))
+ ")")) + ";");
if (isSeq)
{
foreach (var c in ctors)
{
string cName = Compile_Constructor(t, c.Name, app.typeArgs).AppName();
string args = String.Join(", ", c.Formals.Select(f => f.Name));
string parms = String.Join(", ", c.Formals.Select(f => f.Name + ":"
+ TypeString(app.AppType(f.Type))));
iwriter.WriteLine("function _" + cName + "(" + parms + "):" + dataName + ";");
writer.WriteLine("function implementation _" + cName + "(" + parms + "):"
+ dataName + " { " + cName + "(" + args + ") }");
foreach (var f in c.Formals)
{
string tName = TypeString(app.AppType(f.Type));
iwriter.WriteLine("function " + f.Name + "_" + cName + "(x:" + dataName
+ "):" + tName + ";");
writer.WriteLine("function implementation " + f.Name + "_" + cName + "(x:" + dataName
+ "):" + tName + " { " + f.Name + "#" + cName + "(x) }");
}
iwriter.WriteLine("function is_" + cName + "(x:" + dataName + "):bool;");
writer.WriteLine("function implementation is_" + cName + "(x:" + dataName
+ "):bool { x is " + cName + " }");
}
}
}
void CompileDatatype2(Type t, TypeApply app)
{
string dataName = app.AppName();
string suffix = dataName.Substring(((UserDefinedType)t).Name.Length);
bool isSeq = dataName.StartsWith("Seq_");
string lemma = isSeq ? "call proc_Seq__Cons__All" + suffix + "();" : "";
TextWriter iwriter = heapIWriter;
List<DatatypeCtor> ctors = compileDatatypes[app].AsDatatype.Ctors;
Func<string,string> dataIs = c => isSeq ? ("is_" + c + "(data)") : ("data is " + c);
string tags = String.Join(" || ", ctors.Select(c =>
"(r.regs[x] == Tag_" + dataName + "_" + c.Name + " && " + dataIs(
Compile_Constructor(t, c.Name, app.typeArgs).AppName()) + ")"));
iwriter.WriteLine(loadTagDecl(dataName, tags));
heapWriter.WriteLine("implementation loadTag_" + dataName
+ "(my r_old:regs, const my core_state:core_state, const linear stk:mem, const linear statics:mem, const linear io:IOState, linear mems_old:mems, $commonVars:commonVars, $gcVars:gcVars, $toAbs:[int]int, $absMem:[int][int]int, $stacksFrames:[int]Frames, objLayouts:[int]ObjLayout, heap:Heap, x:int, y:opn_mem, data:"
+ dataName + ", abs:int, obj:int)");
heapWriter.WriteLine(" returns(my r:regs, linear mems:mems)");
heapWriter.WriteLine("{");
heapWriter.WriteLine(" assert THeapValue(objLayouts, true, $toAbs, obj, abs);");
heapWriter.WriteLine(" assert THeapInv($absMem, objLayouts, heap);");
heapWriter.WriteLine(" " + lemma);
heapWriter.WriteLine(" call r, mems := gcLoadField(r_old, core_state, stk, statics, io, mems_old,");
heapWriter.WriteLine(" $commonVars, $gcVars, $absMem, $toAbs, $stacksFrames, objLayouts,");
heapWriter.WriteLine(" x, y, obj - 4, 2);");
heapWriter.WriteLine("}");
foreach (var ctor in ctors)
{
var ints = ctor.Formals.Where(x => !IsPtrType(app.AppType(x.Type))).ToList();
var ptrs = ctor.Formals.Where(x => IsPtrType(app.AppType(x.Type))).ToList();
var sorted = ints.Concat(ptrs).ToList();
string ctorName = Compile_Constructor(t, ctor.Name, app.typeArgs).AppName();
string cons = isSeq ? ("_" + ctorName) : ctorName;
string parms = String.Join(", ", ctor.Formals.Select(
c => "arg_" + c.Name + ":" + TypeString(app.AppType(c.Type))));
string args = String.Join(", ", ctor.Formals.Select(c => "arg_" + c.Name));
int argRetSize = 4 + 4 * Math.Max(ints.Count, ptrs.Count);
heapIWriter.WriteLine("const stack_size__DafnyCC__Proc_Alloc_" + ctorName + ":int := 256;");
iwriter.WriteLine(allocDecl1(
dataName,
ctorName,
cons,
parms,
args,
argRetSize.ToString()));
string triggers = (IPSize == 8) ? String.Format("{0} && {1}", GcTO64(1), GcTO(3)) : GcTO(1);
for (int i = 0; i < ints.Count; i++)
{
string val = "stk_old.map[r_old.regs[ESP] + "
+ (IPSize + 4 * i) + "]";
iwriter.WriteLine("requires " + CompileBase.IntEqTyped(app.AppType(ints[i].Type), "arg_" + ints[i].Name, val) + ";");
triggers += String.Format(" && {0}", (IPSize == 8 ? StackTO64(i + 1): StackTO(i + 1)));
}
for (int i = 0; i < ptrs.Count; i++)
{
iwriter.WriteLine("requires StackAbsSlot(heap_old, $stacksFrames_old, r_old.regs[ESP] + "
+ (IPSize + 4 + 4 * i) + " + stackGcOffset) == Abs_" + TypeString(app.AppType(ptrs[i].Type))
+ "(arg_" + ptrs[i].Name + ");");
triggers += String.Format(" && {0}", (IPSize == 8 ? GcTO64(i + 2): GcTO(i + 2)));
}
iwriter.WriteLine(allocDecl2(
dataName,
cons,
PreserveHeap(minVerify),
args));
heapWriter.WriteLine(allocImpl1(
dataName,
ctor.Name,
ctorName,
cons,
parms,
args,
(12 + 4 * sorted.Count).ToString(),
(12 + 4 * ints.Count).ToString(),
triggers,
lemma));
for (int i = 0; i < ints.Count; i++)
{
heapWriter.WriteLine(allocImplInt(
dataName,
ctorName,
ints[i].Name,
(12 + IPSize + 4 * i).ToString()));
}
for (int i = 0; i < ptrs.Count; i++)
{
heapWriter.WriteLine(allocImplPtr(
dataName,
ctorName,
ptrs[i].Name,
(RegAlloc.stackGcOffset + 16 + IPSize + 4 * i).ToString() + "/* stackGcOffset + 16 + IPSize + " + (4 * i) + " */"));
}
heapWriter.WriteLine(allocImpl2(
dataName,
ctorName,
(RegAlloc.stackGcOffset + 12 + IPSize).ToString() + "/* stackGcOffset + 12 + IPSize */"));
for (int i = 0; i < sorted.Count; i++)
{
var formal = sorted[i];
iwriter.WriteLine(loadField(
dataName,
dataIs(ctorName),
formal.Name));
if (IsPtrType(app.AppType(formal.Type)))
{
iwriter.WriteLine("ensures HeapAbsData(heap, $absMem_old[abs]["
+ (3 + i) + "]) == Abs_" + TypeString(app.AppType(formal.Type))
+ "(" + formal.Name + (isSeq ? "_" : "#") + ctorName + "(data));");
iwriter.WriteLine("ensures HeapValue(objLayouts_old, true, $toAbs_old, r.regs[x], $absMem_old[abs]["
+ (3 + i) + "]);");
if (DafnySpec.IsArrayType(app.AppType(formal.Type)))
{
iwriter.WriteLine("ensures $absMem_old[abs][" + (3+i) + "] == " + formal.Name + "#" + ctorName + "(data).arrAbs;");
}
}
else
{
iwriter.WriteLine("ensures " + CompileBase.IntEqTyped(
app.AppType(formal.Type), formal.Name + (isSeq ? "_" : "#") + ctorName + "(data)", "r.regs[x]")
+ ";");
}
heapWriter.WriteLine("implementation loadField_" + dataName + "_" + formal.Name
+ "(my r_old:regs, const my core_state:core_state, const linear stk:mem, const linear statics:mem, const linear io:IOState, linear mems_old:mems, $commonVars:commonVars, $gcVars:gcVars, $toAbs:[int]int, $absMem:[int][int]int, $stacksFrames:[int]Frames, objLayouts:[int]ObjLayout, heap:Heap, x:int, y:opn_mem, data:"
+ dataName + ", abs:int, obj:int)");
heapWriter.WriteLine(" returns(my r:regs, linear mems:mems)");
heapWriter.WriteLine("{");
heapWriter.WriteLine(" assert THeapValue(objLayouts, true, $toAbs, obj, abs);");
heapWriter.WriteLine(" assert THeapInv($absMem, objLayouts, heap);");
heapWriter.WriteLine(" call r, mems := gcLoadField(r_old, core_state, stk, statics, io, mems_old, $commonVars, $gcVars, $absMem, $toAbs, $stacksFrames, objLayouts,");
heapWriter.WriteLine(" x, y, obj - 4, " + (3 + i) + ");");
heapWriter.WriteLine(" assert THeapValue(objLayouts, true, $toAbs, r.regs[x], $absMem[abs][" + (3 + i) + "]);");
heapWriter.WriteLine("}");
}
}
}
void CompileDatatype1(Type t, TypeApply app)
{
string dataName = app.AppName();
List<DatatypeCtor> ctors = compileDatatypes[app].AsDatatype.Ctors;
bool isSeq = dataName.StartsWith("Seq_");
bool isTrusted = isSeq ? TrustedType(app.typeArgs.Values) : TrustedType(t);
CompileDatatype1Ghost(t, app,
isTrusted ? trustedWriter : checkedWriter,
isTrusted ? trustedIWriter : checkedIWriter);
CompileDatatype1Code(t, app);
}
void CompileDatatype1Code(Type t, TypeApply app)
{
string dataName = app.AppName();
List<DatatypeCtor> ctors = compileDatatypes[app].AsDatatype.Ctors;
bool isSeq = dataName.StartsWith("Seq_");
for (int i = 0; i < ctors.Count; i++)
{
heapIWriter.WriteLine("const Tag_" + dataName + "_" + ctors[i].Name + ":int := " + (i + 1) + ";");
}
heapWriter.WriteLine("function HeapWordInv_" + dataName + "(absData:[int]AbsData, objLayout:ObjLayout, wordMem:[int]int, data:" + dataName + "):bool");
heapWriter.WriteLine("{");
heapWriter.WriteLine(" true");
foreach (var ctor in ctors)
{
var ints = ctor.Formals.Where(x => !IsPtrType(app.AppType(x.Type))).ToList();
var ptrs = ctor.Formals.Where(x => IsPtrType(app.AppType(x.Type))).ToList();
var sorted = ints.Concat(ptrs).ToList();
string ctorName = Compile_Constructor(t, ctor.Name, app.typeArgs).AppName();
string wordMems = "";
for (int i = 0; i < sorted.Count; i++)
{
heapIWriter.WriteLine("const Offset_" + dataName + "_" + sorted[i].Name + ":int := " + (8 + 4 * i) + ";");
if (IsPtrType(app.AppType(sorted[i].Type)))
{
wordMems += " && absData[wordMem[" + (3 + i) + "]] == Abs_"
+ TypeString(app.AppType(sorted[i].Type)) + "(" + sorted[i].Name
+ (isSeq ? "_" : "#") + ctorName + "(data))";
}
else
{
wordMems += " && " + CompileBase.IntEqTyped(
app.AppType(sorted[i].Type),
sorted[i].Name + (isSeq ? "_" : "#") + ctorName + "(data)",
"wordMem[" + (3 + i) + "]");
}
}
string dataIs = isSeq ? ("is_" + ctorName + "(data)") : "data is " + ctorName;
heapWriter.WriteLine("&& (" + dataIs + " ==> objLayout == ObjLayout("
+ (3 + sorted.Count) + ", " + (3 + ints.Count)
+ ") && wordMem[2] == Tag_" + dataName + "_" + ctor.Name + wordMems + ")");
}
heapWriter.WriteLine("}");
}
public TypeApply Compile_Function(Function function, Dictionary<TypeParameter,Type> typeArgs)
{
Dictionary<string,TypeParameter> substArgs = new Dictionary<string,TypeParameter>();
function.TypeArgs.ForEach(t => substArgs.Add(t.Name, t));
typeArgs = typeArgs.ToDictionary(p => substArgs[p.Key.Name], p => p.Value);
TypeApply apply = new TypeApply(this, DafnySpec.SanitizedName(function), function.TypeArgs, typeArgs);
if (!compileFunctions.ContainsKey(apply))
{
compileFunctions.Add(apply, apply);
var tok = function.tok;
//Console.Error.WriteLine("function: " + function + " :: " + function.GetType());
//Console.Error.WriteLine(" " + function.Body);
//Console.Error.WriteLine(" " + function.IsRecursive + " " + function.IsGhost);
var writers = ChooseWriter(tok, function.Name, apply);
if (!Attributes.Contains(function.Attributes, "imported"))
{
try
{
var compile = new CompileFunction(this, function, apply, writers.Item1, writers.Item2,
writers.Item3, writers.Item4);
if (writers.Item3 == "Seq" && typeArgs.Count == 1)
{
compile.visibleElementType = new List<Type>(apply.typeArgs.Values)[0];
}
compile.minVerify = minVerify;
compile.Compile();
}
catch(Exception e)
{
throw new Exception("while compiling function " + function.Name, e);
}
}
else
{
// imported
if (function.Ens.Count > 0)
{
string name = FunName(SimpleName(apply.AppName()));
AddLemma(new LemmaCall(writers.Item3, (Type)null,
"call lemma_fun_ensures_" + name + "();", false));
}
}
bool hidden = Attributes.Contains(function.Attributes, "opaque");
bool isFull = function.Name.Contains("#") && function.Name.EndsWith("_FULL");
if (!function.IsGhost && !isFull && !IsSpecFile(function.tok.filename))
{
Compile_FunctionAsMethod(function, typeArgs, substArgs);
}
}
return apply;
}
public void CompileDatatype1Ghost(Type t, TypeApply app, TextWriter writer, TextWriter iwriter)
{
// type List = Nil() | Cons(hd:int, tl:List);
string dataName = app.AppName(); // List
List<DatatypeCtor> ctors = compileDatatypes[app].AsDatatype.Ctors;
bool isSeq = dataName.StartsWith("Seq_");
if (isSeq)
{
iwriter.WriteLine("type " + dataName + ";");
}
(isSeq ? writer : iwriter).WriteLine(
"type " + (isSeq ? "implementation" : "") + "{:overload} " + dataName + " = "
+ String.Join(" | ", ctors.Select(c => Compile_Constructor(t, c.Name, app.typeArgs).AppName() + "("
+ String.Join(", ", c.Formals.Select(f => f.Name + ":" + TypeString(app.AppType(f.Type))))
+ ")")) + ";");
if (isSeq)
{
foreach (var c in ctors)
{
string cName = Compile_Constructor(t, c.Name, app.typeArgs).AppName();
string args = String.Join(", ", c.Formals.Select(f => f.Name));
string parms = String.Join(", ", c.Formals.Select(f => f.Name + ":"
+ TypeString(app.AppType(f.Type))));
iwriter.WriteLine("function _" + cName + "(" + parms + "):" + dataName + ";");
writer.WriteLine("function implementation _" + cName + "(" + parms + "):"
+ dataName + " { " + cName + "(" + args + ") }");
foreach (var f in c.Formals)
{
string tName = TypeString(app.AppType(f.Type));
iwriter.WriteLine("function " + f.Name + "_" + cName + "(x:" + dataName
+ "):" + tName + ";");
writer.WriteLine("function implementation " + f.Name + "_" + cName + "(x:" + dataName
+ "):" + tName + " { " + f.Name + "#" + cName + "(x) }");
}
iwriter.WriteLine("function is_" + cName + "(x:" + dataName + "):bool;");
writer.WriteLine("function implementation is_" + cName + "(x:" + dataName
+ "):bool { x is " + cName + " }");
}
}
}
private void AddGhostCall(List <RtlVar> destVars, List <Expression> args, TypeApply typeApply, bool isHeap)
{
AddGhostCall(destVars, SimpleName(typeApply.AppName()), args, isHeap);
}
public RtlExp GhostExpressionRec(Expression exp, bool inRecSpec = false, bool inRequiresOrOld = false)
{
Util.Assert(!isPrinting);
exp = GetExp(exp);
StmtExpr stmtExpr = exp as StmtExpr;
IdentifierExpr idExp = exp as IdentifierExpr;
LiteralExpr literal = exp as LiteralExpr;
BinaryExpr binary = exp as BinaryExpr;
UnaryExpr unary = exp as UnaryExpr;
ITEExpr ite = exp as ITEExpr;
ExistsExpr existsExp = exp as ExistsExpr;
ForallExpr forallExp = exp as ForallExpr;
LetExpr letExp = exp as LetExpr;
MatchExpr matchExp = exp as MatchExpr;
OldExpr oldExp = exp as OldExpr;
FreshExpr freshExp = exp as FreshExpr;
FunctionCallExpr funCall = exp as FunctionCallExpr;
DatatypeValue dataVal = exp as DatatypeValue;
FieldSelectExpr fieldSelect = exp as FieldSelectExpr;
SeqSelectExpr seqSelect = exp as SeqSelectExpr;
SeqUpdateExpr seqUpdate = exp as SeqUpdateExpr;
SeqDisplayExpr seqDisplay = exp as SeqDisplayExpr;
Func <Expression, RtlExp> G = e => GhostExpression(e, inRecSpec, inRequiresOrOld);
if (stmtExpr != null)
{
if (stmtExprEnabled)
{
if (ignoreStmtExpr == 0)
{
AddGhostStatement(stmtExpr.S);
}
return(G(stmtExpr.E));
}
else
{
throw new Exception("not implemented: cannot handle statement expression here");
}
}
else if (idExp != null)
{
return(AsVar(idExp));
}
else if (literal != null && literal.Value is BigInteger)
{
return(new RtlInt((BigInteger)(literal.Value)));
}
else if (literal != null && literal.Value is bool)
{
return(new RtlLiteral((bool)(literal.Value) ? "true" : "false"));
}
else if (literal != null && literal.Value == null)
{
return(new RtlLiteral("ArrayOfInt(0 - 1, NO_ABS)"));
}
else if (literal != null && literal.Value is Microsoft.Basetypes.BigDec)
{
return(new RtlLiteral(((Microsoft.Basetypes.BigDec)literal.Value).ToDecimalString()));
}
else if (binary != null)
{
string op = null;
string internalOp = null;
CompileFunction compileFunction = this as CompileFunction;
string thisFuncName = (compileFunction == null) ? null : compileFunction.function.Name;
switch (binary.ResolvedOp)
{
case BinaryExpr.ResolvedOpcode.SeqEq:
return(new RtlApply(dafnySpec.GetSeqOperationName(AppType(binary.E0.Type), "Seq_Equal"),
new RtlExp[] { G(binary.E0), G(binary.E1) }));
case BinaryExpr.ResolvedOpcode.SeqNeq:
return(new RtlLiteral("(!" +
new RtlApply(dafnySpec.GetSeqOperationName(AppType(binary.E0.Type), "Seq_Equal"),
new RtlExp[] { G(binary.E0), G(binary.E1) }) + ")"));
case BinaryExpr.ResolvedOpcode.Concat:
return(new RtlApply(dafnySpec.GetSeqOperationName(AppType(binary.Type), "Seq_Append"),
new RtlExp[] { G(binary.E0), G(binary.E1) }));
}
if (binary.Op == BinaryExpr.Opcode.Exp)
{
binary = new BinaryExpr(binary.tok, BinaryExpr.Opcode.Imp, binary.E0, binary.E1);
}
switch (binary.Op)
{
case BinaryExpr.Opcode.Disjoint:
case BinaryExpr.Opcode.In:
case BinaryExpr.Opcode.NotIn:
throw new Exception("not implemented: binary operator '" + BinaryExpr.OpcodeString(binary.Op) + "'");
}
if (AppType(binary.E0.Type) is IntType && AppType(binary.E1.Type) is IntType)
{
switch (binary.Op)
{
case BinaryExpr.Opcode.Le: internalOp = "INTERNAL_le_boogie"; break;
case BinaryExpr.Opcode.Lt: internalOp = "INTERNAL_lt_boogie"; break;
case BinaryExpr.Opcode.Ge: internalOp = "INTERNAL_ge_boogie"; break;
case BinaryExpr.Opcode.Gt: internalOp = "INTERNAL_gt_boogie"; break;
case BinaryExpr.Opcode.Add: internalOp = "INTERNAL_add_boogie"; break;
case BinaryExpr.Opcode.Sub: internalOp = "INTERNAL_sub_boogie"; break;
case BinaryExpr.Opcode.Mul:
op = "*";
if (thisFuncName != "INTERNAL_mul")
{
internalOp = FunName("INTERNAL__mul");
}
break;
case BinaryExpr.Opcode.Div:
op = "div";
if (thisFuncName != "INTERNAL_div")
{
internalOp = FunName("INTERNAL__div");
}
break;
case BinaryExpr.Opcode.Mod:
op = "mod";
if (thisFuncName != "INTERNAL_mod")
{
internalOp = FunName("INTERNAL__mod");
}
break;
default:
op = BinaryExpr.OpcodeString(binary.Op);
break;
}
}
else
{
op = BinaryExpr.OpcodeString(binary.Op);
}
if (internalOp == null)
{
return(new RtlBinary(op, G(binary.E0), G(binary.E1)));
}
else
{
return(new RtlApply(internalOp, new RtlExp[]
{ G(binary.E0), G(binary.E1) }));
}
}
else if (unary != null && unary.Op == UnaryExpr.Opcode.Not)
{
return(new RtlLiteral("(!(" + G(unary.E) + "))"));
}
else if (unary != null && unary.Op == UnaryExpr.Opcode.SeqLength)
{
return(new RtlApply(dafnySpec.GetSeqOperationName(AppType(unary.E.Type), "Seq_Length"),
new RtlExp[] { G(unary.E) }));
}
else if (ite != null)
{
return(GhostIfThenElse(G(ite.Test), () => G(ite.Thn), () => G(ite.Els)));
}
else if (funCall != null)
{
switch (funCall.Function.Name)
{
case "left":
case "right":
case "relation":
case "public":
Util.Assert(funCall.Args.Count == 1);
return(new RtlApply(funCall.Function.Name, new RtlExp[] { G(funCall.Args[0]) }));
case "sizeof":
Util.Assert(funCall.Args.Count == 1);
return(new RtlApply(funCall.Function.Name + "##" + TypeString(AppType(funCall.Args[0].Type)),
new RtlExp[] { G(funCall.Args[0]) }));
case "INTERNAL_add_raw":
Util.Assert(funCall.Args.Count == 2);
return(new RtlBinary("+", G(funCall.Args[0]), G(funCall.Args[1])));
case "INTERNAL_sub_raw":
Util.Assert(funCall.Args.Count == 2);
return(new RtlBinary("-", G(funCall.Args[0]), G(funCall.Args[1])));
case "IntToReal":
Util.Assert(funCall.Args.Count == 1);
return(new RtlApply("real", new RtlExp[] { G(funCall.Args[0]) }));
case "RealToInt":
Util.Assert(funCall.Args.Count == 1);
return(new RtlApply("int", new RtlExp[] { G(funCall.Args[0]) }));
}
TypeApply app = dafnySpec.Compile_Function(funCall.Function,
funCall.TypeArgumentSubstitutions.ToDictionary(p => p.Key, p => AppType(p.Value)));
string name = FunName(SimpleName(app.AppName()));
string fullName = FunName(SimpleName(app.AppFullName()));
List <RtlExp> rtlArgs = funCall.Args.Select(G).ToList();
List <RtlExp> rtlReads = funCall.Function.Reads.Where(e => e.Field != null).ToList()
.ConvertAll(e => (RtlExp) new RtlVar(
GhostVar(e.FieldName), e.Field.IsGhost, AppType(e.Field.Type)));
rtlArgs = rtlReads.Concat(rtlArgs).ToList();
if (name.EndsWith("__INTERNAL__HEAP"))
{
name = name.Substring(0, name.Length - "__INTERNAL__HEAP".Length);
}
else if (DafnySpec.IsHeapFunction(funCall.Function))
{
rtlArgs.Insert(0, new RtlLiteral(inRequiresOrOld ? "$absMem_old" : "$absMem"));
}
if (Attributes.Contains(funCall.Function.Attributes, "opaque") &&
funCall.Function.Formals.Count + rtlReads.Count == 0)
{
rtlArgs.Insert(0, new RtlLiteral("true"));
}
if (fullName == recFunName)
{
name = fullName;
}
if (name == recFunName)
{
recCalls.Add(new List <RtlExp>(rtlArgs));
rtlArgs.Insert(0, new RtlApply("decreases_" + name, new List <RtlExp>(rtlArgs)));
rtlArgs.Insert(1, new RtlLiteral(inRecSpec ? "__unroll" : "__unroll + 1"));
name = "rec_" + name;
}
return(new RtlApply(name, rtlArgs));
}
else if (dataVal != null)
{
bool isSeq = dataVal.Type.TypeName(null).StartsWith("Seq<");
return(new RtlApply((isSeq ? "_" : "") + dafnySpec.Compile_Constructor(
dataVal.Type, dataVal.Ctor.Name, dataVal.InferredTypeArgs, typeApply.typeArgs).AppName(),
dataVal.Arguments.Select(G)));
}
else if (existsExp != null || forallExp != null)
{
QuantifierExpr qExp = (QuantifierExpr)exp;
bool isForall = forallExp != null;
var varTuples = qExp.BoundVars.Select(v => Tuple.Create(GhostVar(v.Name), v.IsGhost, v.Type));
var oldRenamer = PushRename(qExp.BoundVars.Select(v => v.Name));
var oldStmtExprEnabled = stmtExprEnabled;
stmtExprEnabled = false;
RtlExp rExp = new RtlLiteral((isForall ? "(forall " : "(exists ")
+ string.Join(", ", qExp.BoundVars.Select(v => GhostVar(v.Name) + ":" + TypeString(AppType(v.Type))))
+ " :: " + Triggers(qExp.Attributes, G) + " "
+ GetTypeWellFormedExp(varTuples.ToList(), isForall ? "==>" : "&&", G(qExp.Term)) + ")");
stmtExprEnabled = oldStmtExprEnabled;
PopRename(oldRenamer);
return(rExp);
}
else if (letExp != null)
{
List <RtlExp> rhss;
if (letExp.Exact)
{
rhss = letExp.RHSs.ConvertAll(e => G(e));
}
else if (letExp.LHSs.Count == 1 && LiteralExpr.IsTrue(letExp.RHSs[0]) && AppType(letExp.LHSs[0].Var.Type) is IntType)
{
rhss = new List <RtlExp> {
new RtlLiteral("0")
};
}
else
{
throw new Exception("not implemented: LetExpr: " + letExp);
}
return(GhostLet(exp.tok, letExp.LHSs.ConvertAll(lhs => lhs.Var), rhss, () => G(letExp.Body)));
}
else if (matchExp != null)
{
if (matchExp.MissingCases.Count != 0)
{
throw new Exception("not implemented: MatchExpr with missing cases: " + matchExp);
}
//- match src case c1(ps1) => e1 ... cn(psn) => en
//- -->
//- let x := src in
//- if x is c1 then let ps1 := ...x.f1... in e1 else
//- if x is c2 then let ps2 := ...x.f2... in e2 else
//- let ps3 := ...x.f3... in e3
var src = G(matchExp.Source);
var cases = matchExp.Cases;
string x = TempName();
Func <RtlExp> body = null;
for (int i = cases.Count; i > 0;)
{
i--;
MatchCaseExpr c = cases[i];
Func <List <RtlExp> > cRhss = () => c.Ctor.Formals.ConvertAll(f => (RtlExp) new RtlLiteral("("
+ f.Name + "#" + c.Ctor.Name + "(" + GhostVar(x) + "))"));
Func <RtlExp> ec = () => GhostLet(exp.tok, c.Arguments, cRhss(), () => G(c.Body));
if (body == null)
{
body = ec;
}
else
{
var prevBody = body;
body = () => GhostIfThenElse(new RtlLiteral("(" + GhostVar(x) + " is " + c.Ctor.Name + ")"),
ec, prevBody);
}
}
return(GhostLet(exp.tok, new List <BoundVar> {
new BoundVar(exp.tok, x, matchExp.Source.Type)
},
new List <RtlExp> {
src
}, body));
}
else if (oldExp != null)
{
return(new RtlLiteral("old(" + GhostExpression(oldExp.E, inRecSpec, true) + ")"));
}
else if (freshExp != null)
{
Util.Assert(DafnySpec.IsArrayType(freshExp.E.Type));
string abs = G(freshExp.E) + ".arrAbs";
return(new RtlLiteral("(heap_old.absData[" + abs + "] is AbsNone)"));
}
else if (fieldSelect != null && fieldSelect.FieldName.EndsWith("?"))
{
string constructor = fieldSelect.FieldName.Substring(0, fieldSelect.FieldName.Length - 1);
constructor = dafnySpec.Compile_Constructor(fieldSelect.Obj.Type, constructor, null, typeApply.typeArgs).AppName();
bool isSeq = fieldSelect.Obj.Type.TypeName(null).StartsWith("Seq<");
return(isSeq
? new RtlLiteral("is_" + constructor + "(" + G(fieldSelect.Obj) + ")")
: new RtlLiteral("((" + G(fieldSelect.Obj) + ") is " + constructor + ")"));
}
else if (fieldSelect != null && !fieldSelect.Field.IsStatic && AppType(fieldSelect.Obj.Type) is UserDefinedType &&
fieldSelect.Field is DatatypeDestructor)
{
DatatypeDestructor field = (DatatypeDestructor)fieldSelect.Field;
string constructor = dafnySpec.Compile_Constructor(fieldSelect.Obj.Type,
field.EnclosingCtor.Name, null, typeApply.typeArgs).AppName();
bool isSeq = fieldSelect.Obj.Type.TypeName(null).StartsWith("Seq<");
return(new RtlLiteral("(" + fieldSelect.FieldName + (isSeq ? "_" : "#") + constructor
+ "(" + G(fieldSelect.Obj) + "))"));
}
else if (fieldSelect != null && DafnySpec.IsArrayType(AppType(fieldSelect.Obj.Type)) &&
fieldSelect.FieldName == "Length")
{
return(new RtlLiteral("(Arr_Length(" + G(fieldSelect.Obj) + "))"));
}
else if (fieldSelect != null && fieldSelect.Obj is ImplicitThisExpr)
{
//- we don't support objects yet, so interpret this as a global variable
return(new RtlVar(GhostVar(fieldSelect.FieldName), true, fieldSelect.Type));
}
else if (seqSelect != null)
{
if (seqSelect.SelectOne && DafnySpec.IsArrayType(AppType(seqSelect.Seq.Type)))
{
return(new RtlExpComputed(e => "fun_INTERNAL__array__elems__index("
+ (inRequiresOrOld ? "$absMem_old" : "$absMem") + "[" + e.args[0] + ".arrAbs], ("
+ e.args[1] + "))", new RtlExp[] { G(seqSelect.Seq), G(seqSelect.E0) }));
}
else if (seqSelect.SelectOne)
{
return(new RtlApply(dafnySpec.GetSeqOperationName(AppType(seqSelect.Seq.Type), "Seq_Index"),
new RtlExp[] { G(seqSelect.Seq), G(seqSelect.E0) }));
}
else
{
RtlExp seq = G(seqSelect.Seq);
if (DafnySpec.IsArrayType(AppType(seqSelect.Seq.Type)))
{
seq = new RtlApply(FunName("Seq__FromArray"), new RtlExp[] {
new RtlLiteral(inRequiresOrOld ? "$absMem_old" : "$absMem"), seq
});
}
if (seqSelect.E1 != null)
{
seq = new RtlApply(dafnySpec.GetSeqOperationName(AppType(seqSelect.Type), "Seq_Take"),
new RtlExp[] { seq, G(seqSelect.E1) });
}
if (seqSelect.E0 != null)
{
seq = new RtlApply(dafnySpec.GetSeqOperationName(AppType(seqSelect.Type), "Seq_Drop"),
new RtlExp[] { seq, G(seqSelect.E0) });
}
return(seq);
}
}
else if (seqUpdate != null)
{
if (seqUpdate.ResolvedUpdateExpr != null)
{
return(GhostExpressionRec(seqUpdate.ResolvedUpdateExpr, inRecSpec, inRequiresOrOld));
}
return(new RtlApply(dafnySpec.GetSeqOperationName(AppType(seqUpdate.Seq.Type), "Seq_Update"),
new RtlExp[] { G(seqUpdate.Seq), G(seqUpdate.Index), G(seqUpdate.Value) }));
}
else if (seqDisplay != null)
{
RtlExp seq = new RtlApply(dafnySpec.GetSeqOperationName(AppType(seqDisplay.Type), "Seq_Empty"), new RtlExp[0]);
foreach (Expression ei in seqDisplay.Elements)
{
seq = new RtlApply(dafnySpec.GetSeqOperationName(AppType(seqDisplay.Type), "Seq_Build"),
new RtlExp[] { seq, G(ei) });
}
return(seq);
}
else
{
throw new Exception("not implemented: " + exp);
}
}
private void AddGhostCall(List<RtlVar> destVars, List<Expression> args, TypeApply typeApply, bool isHeap)
{
AddGhostCall(destVars, SimpleName(typeApply.AppName()), args, isHeap);
}