using System.Collections; using System.Collections.Generic; using System.IO; using System.Text; using Microsoft.Boogie; using Microsoft.Basetypes; using Bpl = Microsoft.Boogie; using System; using System.Diagnostics.Contracts; public class Parser { public const int _EOF = 0; public const int _ident = 1; public const int _bvlit = 2; public const int _digits = 3; public const int _string = 4; public const int _decimal = 5; public const int _float = 6; public const int maxT = 96; const bool T = true; const bool x = false; const int minErrDist = 2; public Scanner/*!*/ scanner; public Errors/*!*/ errors; public Token/*!*/ t; // last recognized token public Token/*!*/ la; // lookahead token int errDist = minErrDist; readonly Program/*!*/ Pgm; readonly Expr/*!*/ dummyExpr; readonly Cmd/*!*/ dummyCmd; readonly Block/*!*/ dummyBlock; readonly Bpl.Type/*!*/ dummyType; readonly List/*!*/ dummyExprSeq; readonly TransferCmd/*!*/ dummyTransferCmd; readonly StructuredCmd/*!*/ dummyStructuredCmd; /// ///Returns the number of parsing errors encountered. If 0, "program" returns as ///the parsed program. /// public static int Parse (string/*!*/ filename, /*maybe null*/ List defines, out /*maybe null*/ Program program, bool useBaseName=false) /* throws System.IO.IOException */ { Contract.Requires(filename != null); Contract.Requires(cce.NonNullElements(defines,true)); if (defines == null) { defines = new List(); } if (filename == "stdin.bpl") { var s = ParserHelper.Fill(Console.In, defines); return Parse(s, filename, out program, useBaseName); } else { FileStream stream = new FileStream(filename, FileMode.Open, FileAccess.Read, FileShare.Read); var s = ParserHelper.Fill(stream, defines); var ret = Parse(s, filename, out program, useBaseName); stream.Close(); return ret; } } public static int Parse (string s, string/*!*/ filename, out /*maybe null*/ Program program, bool useBaseName=false) /* throws System.IO.IOException */ { Contract.Requires(s != null); Contract.Requires(filename != null); byte[]/*!*/ buffer = cce.NonNull(UTF8Encoding.Default.GetBytes(s)); MemoryStream ms = new MemoryStream(buffer,false); Errors errors = new Errors(); Scanner scanner = new Scanner(ms, errors, filename, useBaseName); Parser parser = new Parser(scanner, errors, false); parser.Parse(); if (parser.errors.count == 0) { program = parser.Pgm; program.ProcessDatatypeConstructors(); return 0; } else { program = null; return parser.errors.count; } } public Parser(Scanner/*!*/ scanner, Errors/*!*/ errors, bool disambiguation) : this(scanner, errors) { // initialize readonly fields Pgm = new Program(); dummyExpr = new LiteralExpr(Token.NoToken, false); dummyCmd = new AssumeCmd(Token.NoToken, dummyExpr); dummyBlock = new Block(Token.NoToken, "dummyBlock", new List(), new ReturnCmd(Token.NoToken)); dummyType = new BasicType(Token.NoToken, SimpleType.Bool); dummyExprSeq = new List (); dummyTransferCmd = new ReturnCmd(Token.NoToken); dummyStructuredCmd = new BreakCmd(Token.NoToken, null); } // Class to represent the bounds of a bitvector expression t[a:b]. // Objects of this class only exist during parsing and are directly // turned into BvExtract before they get anywhere else private class BvBounds : Expr { public BigNum Lower; public BigNum Upper; public BvBounds(IToken/*!*/ tok, BigNum lower, BigNum upper) : base(tok) { Contract.Requires(tok != null); this.Lower = lower; this.Upper = upper; } public override Bpl.Type/*!*/ ShallowType { get {Contract.Ensures(Contract.Result() != null); return Bpl.Type.Int; } } public override void Resolve(ResolutionContext/*!*/ rc) { // Contract.Requires(rc != null); rc.Error(this, "bitvector bounds in illegal position"); } public override void Emit(TokenTextWriter/*!*/ stream, int contextBindingStrength, bool fragileContext) { Contract.Assert(false);throw new cce.UnreachableException(); } public override void ComputeFreeVariables(GSet/*!*/ freeVars) { Contract.Assert(false);throw new cce.UnreachableException(); } } /*--------------------------------------------------------------------------*/ public Parser(Scanner/*!*/ scanner, Errors/*!*/ errors) { this.scanner = scanner; this.errors = errors; Token/*!*/ tok = new Token(); tok.val = ""; this.la = tok; this.t = new Token(); // just to satisfy its non-null constraint } void SynErr (int n) { if (errDist >= minErrDist) errors.SynErr(la.filename, la.line, la.col, n); errDist = 0; } public void SemErr (string/*!*/ msg) { Contract.Requires(msg != null); if (errDist >= minErrDist) errors.SemErr(t, msg); errDist = 0; } public void SemErr(IToken/*!*/ tok, string/*!*/ msg) { Contract.Requires(tok != null); Contract.Requires(msg != null); errors.SemErr(tok, msg); } void Get () { for (;;) { t = la; la = scanner.Scan(); if (la.kind <= maxT) { ++errDist; break; } la = t; } } void Expect (int n) { if (la.kind==n) Get(); else { SynErr(n); } } bool StartOf (int s) { return set[s, la.kind]; } void ExpectWeak (int n, int follow) { if (la.kind == n) Get(); else { SynErr(n); while (!StartOf(follow)) Get(); } } bool WeakSeparator(int n, int syFol, int repFol) { int kind = la.kind; if (kind == n) {Get(); return true;} else if (StartOf(repFol)) {return false;} else { SynErr(n); while (!(set[syFol, kind] || set[repFol, kind] || set[0, kind])) { Get(); kind = la.kind; } return StartOf(syFol); } } void BoogiePL() { List/*!*/ vs; List/*!*/ ds; Axiom/*!*/ ax; List/*!*/ ts; Procedure/*!*/ pr; Implementation im; Implementation/*!*/ nnim; while (StartOf(1)) { switch (la.kind) { case 21: { Consts(out vs); foreach(Bpl.Variable/*!*/ v in vs){ Contract.Assert(v != null); Pgm.TopLevelDeclarations.Add(v); } break; } case 25: { Function(out ds); foreach(Bpl.Declaration/*!*/ d in ds){ Contract.Assert(d != null); Pgm.TopLevelDeclarations.Add(d); } break; } case 29: { Axiom(out ax); Pgm.TopLevelDeclarations.Add(ax); break; } case 30: { UserDefinedTypes(out ts); foreach(Declaration/*!*/ td in ts){ Contract.Assert(td != null); Pgm.TopLevelDeclarations.Add(td); } break; } case 7: { GlobalVars(out vs); foreach(Bpl.Variable/*!*/ v in vs){ Contract.Assert(v != null); Pgm.TopLevelDeclarations.Add(v); } break; } case 32: { Procedure(out pr, out im); Pgm.TopLevelDeclarations.Add(pr); if (im != null) { Pgm.TopLevelDeclarations.Add(im); } break; } case 33: { Implementation(out nnim); Pgm.TopLevelDeclarations.Add(nnim); break; } } } Expect(0); } void Consts(out List/*!*/ ds) { Contract.Ensures(Contract.ValueAtReturn(out ds) != null); IToken/*!*/ y; List/*!*/ xs; ds = new List(); bool u = false; QKeyValue kv = null; bool ChildrenComplete = false; List Parents = null; Expect(21); y = t; while (la.kind == 27) { Attribute(ref kv); } if (la.kind == 22) { Get(); u = true; } IdsType(out xs); if (la.kind == 23) { OrderSpec(out ChildrenComplete, out Parents); } bool makeClone = false; foreach(TypedIdent/*!*/ x in xs){ Contract.Assert(x != null); // ensure that no sharing is introduced List ParentsClone; if (makeClone && Parents != null) { ParentsClone = new List (); foreach (ConstantParent/*!*/ p in Parents){ Contract.Assert(p != null); ParentsClone.Add(new ConstantParent ( new IdentifierExpr (p.Parent.tok, p.Parent.Name), p.Unique));} } else { ParentsClone = Parents; } makeClone = true; ds.Add(new Constant(y, x, u, ParentsClone, ChildrenComplete, kv)); } Expect(8); } void Function(out List/*!*/ ds) { Contract.Ensures(Contract.ValueAtReturn(out ds) != null); ds = new List(); IToken/*!*/ z; IToken/*!*/ typeParamTok; var typeParams = new List(); var arguments = new List(); TypedIdent/*!*/ tyd; TypedIdent retTyd = null; Bpl.Type/*!*/ retTy; QKeyValue argKv = null; QKeyValue kv = null; Expr definition = null; Expr/*!*/ tmp; Expect(25); while (la.kind == 27) { Attribute(ref kv); } Ident(out z); if (la.kind == 19) { TypeParams(out typeParamTok, out typeParams); } Expect(9); if (StartOf(2)) { VarOrType(out tyd, out argKv); arguments.Add(new Formal(tyd.tok, tyd, true, argKv)); while (la.kind == 12) { Get(); VarOrType(out tyd, out argKv); arguments.Add(new Formal(tyd.tok, tyd, true, argKv)); } } Expect(10); argKv = null; if (la.kind == 26) { Get(); Expect(9); VarOrType(out retTyd, out argKv); Expect(10); } else if (la.kind == 11) { Get(); Type(out retTy); retTyd = new TypedIdent(retTy.tok, TypedIdent.NoName, retTy); } else SynErr(97); if (la.kind == 27) { Get(); Expression(out tmp); definition = tmp; Expect(28); } else if (la.kind == 8) { Get(); } else SynErr(98); if (retTyd == null) { // construct a dummy type for the case of syntax error retTyd = new TypedIdent(t, TypedIdent.NoName, new BasicType(t, SimpleType.Int)); } Function/*!*/ func = new Function(z, z.val, typeParams, arguments, new Formal(retTyd.tok, retTyd, false, argKv), null, kv); Contract.Assert(func != null); ds.Add(func); bool allUnnamed = true; foreach(Formal/*!*/ f in arguments){ Contract.Assert(f != null); if (f.TypedIdent.HasName) { allUnnamed = false; break; } } if (!allUnnamed) { Bpl.Type prevType = null; for (int i = arguments.Count; 0 <= --i; ) { TypedIdent/*!*/ curr = cce.NonNull(arguments[i]).TypedIdent; if (curr.HasName) { // the argument was given as both an identifier and a type prevType = curr.Type; } else { // the argument was given as just one "thing", which syntactically parsed as a type if (prevType == null) { this.errors.SemErr(curr.tok, "the type of the last parameter is unspecified"); break; } Bpl.Type ty = curr.Type; var uti = ty as UnresolvedTypeIdentifier; if (uti != null && uti.Arguments.Count == 0) { // the given "thing" was just an identifier, so let's use it as the name of the parameter curr.Name = uti.Name; curr.Type = prevType; } else { this.errors.SemErr(curr.tok, "expecting an identifier as parameter name"); } } } } if (definition != null) { // generate either an axiom or a function body if (QKeyValue.FindBoolAttribute(kv, "inline")) { func.Body = definition; } else { ds.Add(func.CreateDefinitionAxiom(definition, kv)); } } } void Axiom(out Axiom/*!*/ m) { Contract.Ensures(Contract.ValueAtReturn(out m) != null); Expr/*!*/ e; QKeyValue kv = null; Expect(29); while (la.kind == 27) { Attribute(ref kv); } IToken/*!*/ x = t; Proposition(out e); Expect(8); m = new Axiom(x,e, null, kv); } void UserDefinedTypes(out List/*!*/ ts) { Contract.Ensures(cce.NonNullElements(Contract.ValueAtReturn(out ts))); Declaration/*!*/ decl; QKeyValue kv = null; ts = new List (); Expect(30); while (la.kind == 27) { Attribute(ref kv); } UserDefinedType(out decl, kv); ts.Add(decl); while (la.kind == 12) { Get(); UserDefinedType(out decl, kv); ts.Add(decl); } Expect(8); } void GlobalVars(out List/*!*/ ds) { Contract.Ensures(Contract.ValueAtReturn(out ds) != null); QKeyValue kv = null; ds = new List(); var dsx = ds; Expect(7); while (la.kind == 27) { Attribute(ref kv); } IdsTypeWheres(true, "global variables", delegate(TypedIdent tyd) { dsx.Add(new GlobalVariable(tyd.tok, tyd, kv)); } ); Expect(8); } void Procedure(out Procedure/*!*/ proc, out /*maybe null*/ Implementation impl) { Contract.Ensures(Contract.ValueAtReturn(out proc) != null); IToken/*!*/ x; List/*!*/ typeParams; List/*!*/ ins, outs; List/*!*/ pre = new List(); List/*!*/ mods = new List(); List/*!*/ post = new List(); List/*!*/ locals = new List(); StmtList/*!*/ stmtList; QKeyValue kv = null; impl = null; Expect(32); ProcSignature(true, out x, out typeParams, out ins, out outs, out kv); if (la.kind == 8) { Get(); while (StartOf(3)) { Spec(pre, mods, post); } } else if (StartOf(4)) { while (StartOf(3)) { Spec(pre, mods, post); } ImplBody(out locals, out stmtList); impl = new Implementation(x, x.val, typeParams, Formal.StripWhereClauses(ins), Formal.StripWhereClauses(outs), locals, stmtList, kv == null ? null : (QKeyValue)kv.Clone(), this.errors); } else SynErr(99); proc = new Procedure(x, x.val, typeParams, ins, outs, pre, mods, post, kv); } void Implementation(out Implementation/*!*/ impl) { Contract.Ensures(Contract.ValueAtReturn(out impl) != null); IToken/*!*/ x; List/*!*/ typeParams; List/*!*/ ins, outs; List/*!*/ locals; StmtList/*!*/ stmtList; QKeyValue kv; Expect(33); ProcSignature(false, out x, out typeParams, out ins, out outs, out kv); ImplBody(out locals, out stmtList); impl = new Implementation(x, x.val, typeParams, ins, outs, locals, stmtList, kv, this.errors); } void Attribute(ref QKeyValue kv) { Trigger trig = null; AttributeOrTrigger(ref kv, ref trig); if (trig != null) this.SemErr("only attributes, not triggers, allowed here"); } void IdsTypeWheres(bool allowWhereClauses, string context, System.Action action ) { IdsTypeWhere(allowWhereClauses, context, action); while (la.kind == 12) { Get(); IdsTypeWhere(allowWhereClauses, context, action); } } void LocalVars(List/*!*/ ds) { Contract.Ensures(Contract.ValueAtReturn(out ds) != null); QKeyValue kv = null; Expect(7); while (la.kind == 27) { Attribute(ref kv); } IdsTypeWheres(true, "local variables", delegate(TypedIdent tyd) { ds.Add(new LocalVariable(tyd.tok, tyd, kv)); } ); Expect(8); } void ProcFormals(bool incoming, bool allowWhereClauses, out List/*!*/ ds) { Contract.Ensures(Contract.ValueAtReturn(out ds) != null); ds = new List(); var dsx = ds; var context = allowWhereClauses ? "procedure formals" : "the 'implementation' copies of formals"; Expect(9); if (la.kind == 1 || la.kind == 27) { AttrsIdsTypeWheres(allowWhereClauses, allowWhereClauses, context, delegate(TypedIdent tyd, QKeyValue kv) { dsx.Add(new Formal(tyd.tok, tyd, incoming, kv)); }); } Expect(10); } void AttrsIdsTypeWheres(bool allowAttributes, bool allowWhereClauses, string context, System.Action action ) { AttributesIdsTypeWhere(allowAttributes, allowWhereClauses, context, action); while (la.kind == 12) { Get(); AttributesIdsTypeWhere(allowAttributes, allowWhereClauses, context, action); } } void BoundVars(IToken/*!*/ x, out List/*!*/ ds) { Contract.Requires(x != null); Contract.Ensures(Contract.ValueAtReturn(out ds) != null); List/*!*/ tyds = new List(); ds = new List(); var dsx = ds; AttrsIdsTypeWheres(true, false, "bound variables", delegate(TypedIdent tyd, QKeyValue kv) { dsx.Add(new BoundVariable(tyd.tok, tyd, kv)); } ); } void IdsType(out List/*!*/ tyds) { Contract.Ensures(Contract.ValueAtReturn(out tyds) != null); List/*!*/ ids; Bpl.Type/*!*/ ty; Idents(out ids); Expect(11); Type(out ty); tyds = new List(); foreach(Token/*!*/ id in ids){ Contract.Assert(id != null); tyds.Add(new TypedIdent(id, id.val, ty, null)); } } void Idents(out List/*!*/ xs) { Contract.Ensures(Contract.ValueAtReturn(out xs) != null); IToken/*!*/ id; xs = new List(); Ident(out id); xs.Add(id); while (la.kind == 12) { Get(); Ident(out id); xs.Add(id); } } void Type(out Bpl.Type/*!*/ ty) { Contract.Ensures(Contract.ValueAtReturn(out ty) != null); IToken/*!*/ tok; ty = dummyType; if (StartOf(5)) { TypeAtom(out ty); } else if (la.kind == 1) { Ident(out tok); List/*!*/ args = new List (); if (StartOf(6)) { TypeArgs(args); } ty = new UnresolvedTypeIdentifier (tok, tok.val, args); } else if (la.kind == 17 || la.kind == 19) { MapType(out ty); } else SynErr(100); } void AttributesIdsTypeWhere(bool allowAttributes, bool allowWhereClauses, string context, System.Action action ) { QKeyValue kv = null; while (la.kind == 27) { Attribute(ref kv); if (!allowAttributes) { kv = null; this.SemErr("attributes are not allowed on " + context); } } IdsTypeWhere(allowWhereClauses, context, delegate(TypedIdent tyd) { action(tyd, kv); }); } void IdsTypeWhere(bool allowWhereClauses, string context, System.Action action ) { List/*!*/ ids; Bpl.Type/*!*/ ty; Expr wh = null; Expr/*!*/ nne; Idents(out ids); Expect(11); Type(out ty); if (la.kind == 13) { Get(); Expression(out nne); if (!allowWhereClauses) { this.SemErr("where clause not allowed on " + context); } else { wh = nne; } } foreach(Token/*!*/ id in ids){ Contract.Assert(id != null); action(new TypedIdent(id, id.val, ty, wh)); } } void Expression(out Expr/*!*/ e0) { Contract.Ensures(Contract.ValueAtReturn(out e0) != null); IToken/*!*/ x; Expr/*!*/ e1; ImpliesExpression(false, out e0); while (la.kind == 55 || la.kind == 56) { EquivOp(); x = t; ImpliesExpression(false, out e1); e0 = Expr.Binary(x, BinaryOperator.Opcode.Iff, e0, e1); } } void TypeAtom(out Bpl.Type/*!*/ ty) { Contract.Ensures(Contract.ValueAtReturn(out ty) != null); ty = dummyType; if (la.kind == 14) { Get(); ty = new BasicType(t, SimpleType.Int); } else if (la.kind == 15) { Get(); ty = new BasicType(t, SimpleType.Real); } else if (la.kind == 16) { Get(); ty = new BasicType(t, SimpleType.Bool); } else if (la.kind == 9) { Get(); Type(out ty); Expect(10); } else SynErr(101); } void Ident(out IToken/*!*/ x) { Contract.Ensures(Contract.ValueAtReturn(out x) != null); Expect(1); x = t; if (x.val.StartsWith("\\")) x.val = x.val.Substring(1); } void TypeArgs(List/*!*/ ts) { Contract.Requires(ts != null); IToken/*!*/ tok; Bpl.Type/*!*/ ty; if (StartOf(5)) { TypeAtom(out ty); ts.Add(ty); if (StartOf(6)) { TypeArgs(ts); } } else if (la.kind == 1) { Ident(out tok); List/*!*/ args = new List (); ts.Add(new UnresolvedTypeIdentifier (tok, tok.val, args)); if (StartOf(6)) { TypeArgs(ts); } } else if (la.kind == 17 || la.kind == 19) { MapType(out ty); ts.Add(ty); } else SynErr(102); } void MapType(out Bpl.Type/*!*/ ty) { Contract.Ensures(Contract.ValueAtReturn(out ty) != null); IToken tok = null; IToken/*!*/ nnTok; List/*!*/ arguments = new List(); Bpl.Type/*!*/ result; List/*!*/ typeParameters = new List(); if (la.kind == 19) { TypeParams(out nnTok, out typeParameters); tok = nnTok; } Expect(17); if (tok == null) tok = t; if (StartOf(6)) { Types(arguments); } Expect(18); Type(out result); ty = new MapType(tok, typeParameters, arguments, result); } void TypeParams(out IToken/*!*/ tok, out List/*!*/ typeParams) { Contract.Ensures(Contract.ValueAtReturn(out tok) != null); Contract.Ensures(Contract.ValueAtReturn(out typeParams) != null); List/*!*/ typeParamToks; Expect(19); tok = t; Idents(out typeParamToks); Expect(20); typeParams = new List (); foreach(Token/*!*/ id in typeParamToks){ Contract.Assert(id != null); typeParams.Add(new TypeVariable(id, id.val));} } void Types(List/*!*/ ts) { Contract.Requires(ts != null); Bpl.Type/*!*/ ty; Type(out ty); ts.Add(ty); while (la.kind == 12) { Get(); Type(out ty); ts.Add(ty); } } void OrderSpec(out bool ChildrenComplete, out List Parents) { Contract.Ensures(cce.NonNullElements(Contract.ValueAtReturn(out Parents),true)); ChildrenComplete = false; Parents = null; bool u; IToken/*!*/ parent; Expect(23); Parents = new List (); u = false; if (la.kind == 1 || la.kind == 22) { if (la.kind == 22) { Get(); u = true; } Ident(out parent); Parents.Add(new ConstantParent ( new IdentifierExpr(parent, parent.val), u)); while (la.kind == 12) { Get(); u = false; if (la.kind == 22) { Get(); u = true; } Ident(out parent); Parents.Add(new ConstantParent ( new IdentifierExpr(parent, parent.val), u)); } } if (la.kind == 24) { Get(); ChildrenComplete = true; } } void VarOrType(out TypedIdent/*!*/ tyd, out QKeyValue kv) { Contract.Ensures(Contract.ValueAtReturn(out tyd) != null); string/*!*/ varName = TypedIdent.NoName; Bpl.Type/*!*/ ty; IToken/*!*/ tok; kv = null; while (la.kind == 27) { Attribute(ref kv); } Type(out ty); tok = ty.tok; if (la.kind == 11) { Get(); var uti = ty as UnresolvedTypeIdentifier; if (uti != null && uti.Arguments.Count == 0) { varName = uti.Name; } else { this.SemErr("expected identifier before ':'"); } Type(out ty); } tyd = new TypedIdent(tok, varName, ty); } void Proposition(out Expr/*!*/ e) { Contract.Ensures(Contract.ValueAtReturn(out e) != null); Expression(out e); } void UserDefinedType(out Declaration/*!*/ decl, QKeyValue kv) { Contract.Ensures(Contract.ValueAtReturn(out decl) != null); IToken/*!*/ id; List/*!*/ paramTokens = new List (); Bpl.Type/*!*/ body = dummyType; bool synonym = false; Ident(out id); if (la.kind == 1) { WhiteSpaceIdents(out paramTokens); } if (la.kind == 31) { Get(); Type(out body); synonym = true; } if (synonym) { List/*!*/ typeParams = new List(); foreach(Token/*!*/ t in paramTokens){ Contract.Assert(t != null); typeParams.Add(new TypeVariable(t, t.val));} decl = new TypeSynonymDecl(id, id.val, typeParams, body, kv); } else { decl = new TypeCtorDecl(id, id.val, paramTokens.Count, kv); } } void WhiteSpaceIdents(out List/*!*/ xs) { Contract.Ensures(Contract.ValueAtReturn(out xs) != null); IToken/*!*/ id; xs = new List(); Ident(out id); xs.Add(id); while (la.kind == 1) { Ident(out id); xs.Add(id); } } void ProcSignature(bool allowWhereClausesOnFormals, out IToken/*!*/ name, out List/*!*/ typeParams, out List/*!*/ ins, out List/*!*/ outs, out QKeyValue kv) { Contract.Ensures(Contract.ValueAtReturn(out name) != null); Contract.Ensures(Contract.ValueAtReturn(out typeParams) != null); Contract.Ensures(Contract.ValueAtReturn(out ins) != null); Contract.Ensures(Contract.ValueAtReturn(out outs) != null); IToken/*!*/ typeParamTok; typeParams = new List(); outs = new List(); kv = null; while (la.kind == 27) { Attribute(ref kv); } Ident(out name); if (la.kind == 19) { TypeParams(out typeParamTok, out typeParams); } ProcFormals(true, allowWhereClausesOnFormals, out ins); if (la.kind == 26) { Get(); ProcFormals(false, allowWhereClausesOnFormals, out outs); } } void Spec(List/*!*/ pre, List/*!*/ mods, List/*!*/ post) { Contract.Requires(pre != null); Contract.Requires(mods != null); Contract.Requires(post != null); List/*!*/ ms; if (la.kind == 34) { Get(); if (la.kind == 1) { Idents(out ms); foreach(IToken/*!*/ m in ms){ Contract.Assert(m != null); mods.Add(new IdentifierExpr(m, m.val)); } } Expect(8); } else if (la.kind == 35) { Get(); SpecPrePost(true, pre, post); } else if (la.kind == 36 || la.kind == 37) { SpecPrePost(false, pre, post); } else SynErr(103); } void ImplBody(out List/*!*/ locals, out StmtList/*!*/ stmtList) { Contract.Ensures(Contract.ValueAtReturn(out locals) != null); Contract.Ensures(Contract.ValueAtReturn(out stmtList) != null); locals = new List(); Expect(27); while (la.kind == 7) { LocalVars(locals); } StmtList(out stmtList); } void SpecPrePost(bool free, List/*!*/ pre, List/*!*/ post) { Contract.Requires(pre != null); Contract.Requires(post != null); Expr/*!*/ e; Token tok = null; QKeyValue kv = null; if (la.kind == 36) { Get(); tok = t; while (la.kind == 27) { Attribute(ref kv); } Proposition(out e); Expect(8); pre.Add(new Requires(tok, free, e, null, kv)); } else if (la.kind == 37) { Get(); tok = t; while (la.kind == 27) { Attribute(ref kv); } Proposition(out e); Expect(8); post.Add(new Ensures(tok, free, e, null, kv)); } else SynErr(104); } void StmtList(out StmtList/*!*/ stmtList) { Contract.Ensures(Contract.ValueAtReturn(out stmtList) != null); List bigblocks = new List(); /* built-up state for the current BigBlock: */ IToken startToken = null; string currentLabel = null; List cs = null; /* invariant: startToken != null ==> cs != null */ /* temporary variables: */ IToken label; Cmd c; BigBlock b; StructuredCmd ec = null; StructuredCmd/*!*/ ecn; TransferCmd tc = null; TransferCmd/*!*/ tcn; while (StartOf(7)) { if (StartOf(8)) { LabelOrCmd(out c, out label); if (c != null) { // LabelOrCmd read a Cmd Contract.Assert(label == null); if (startToken == null) { startToken = c.tok; cs = new List(); } Contract.Assert(cs != null); cs.Add(c); } else { // LabelOrCmd read a label Contract.Assert(label != null); if (startToken != null) { Contract.Assert(cs != null); // dump the built-up state into a BigBlock b = new BigBlock(startToken, currentLabel, cs, null, null); bigblocks.Add(b); cs = null; } startToken = label; currentLabel = label.val; cs = new List(); } } else if (la.kind == 40 || la.kind == 42 || la.kind == 45) { StructuredCmd(out ecn); ec = ecn; if (startToken == null) { startToken = ec.tok; cs = new List(); } Contract.Assert(cs != null); b = new BigBlock(startToken, currentLabel, cs, ec, null); bigblocks.Add(b); startToken = null; currentLabel = null; cs = null; } else { TransferCmd(out tcn); tc = tcn; if (startToken == null) { startToken = tc.tok; cs = new List(); } Contract.Assert(cs != null); b = new BigBlock(startToken, currentLabel, cs, null, tc); bigblocks.Add(b); startToken = null; currentLabel = null; cs = null; } } Expect(28); IToken/*!*/ endCurly = t; if (startToken == null && bigblocks.Count == 0) { startToken = t; cs = new List(); } if (startToken != null) { Contract.Assert(cs != null); b = new BigBlock(startToken, currentLabel, cs, null, null); bigblocks.Add(b); } stmtList = new StmtList(bigblocks, endCurly); } void LabelOrCmd(out Cmd c, out IToken label) { IToken/*!*/ x; Expr/*!*/ e; List/*!*/ xs; List ids; c = dummyCmd; label = null; Cmd/*!*/ cn; QKeyValue kv = null; switch (la.kind) { case 1: { LabelOrAssign(out c, out label); break; } case 46: { Get(); x = t; while (la.kind == 27) { Attribute(ref kv); } Proposition(out e); c = new AssertCmd(x, e, kv); Expect(8); break; } case 47: { Get(); x = t; while (la.kind == 27) { Attribute(ref kv); } Proposition(out e); c = new AssumeCmd(x, e, kv); Expect(8); break; } case 48: { Get(); x = t; Idents(out xs); Expect(8); ids = new List(); foreach(IToken/*!*/ y in xs){ Contract.Assert(y != null); ids.Add(new IdentifierExpr(y, y.val)); } c = new HavocCmd(x,ids); break; } case 35: case 51: case 52: { CallCmd(out cn); Expect(8); c = cn; break; } case 53: { ParCallCmd(out cn); c = cn; break; } case 49: { Get(); x = t; Expect(8); c = new YieldCmd(x); break; } default: SynErr(105); break; } } void StructuredCmd(out StructuredCmd/*!*/ ec) { Contract.Ensures(Contract.ValueAtReturn(out ec) != null); ec = dummyStructuredCmd; Contract.Assume(cce.IsPeerConsistent(ec)); IfCmd/*!*/ ifcmd; WhileCmd/*!*/ wcmd; BreakCmd/*!*/ bcmd; if (la.kind == 40) { IfCmd(out ifcmd); ec = ifcmd; } else if (la.kind == 42) { WhileCmd(out wcmd); ec = wcmd; } else if (la.kind == 45) { BreakCmd(out bcmd); ec = bcmd; } else SynErr(106); } void TransferCmd(out TransferCmd/*!*/ tc) { Contract.Ensures(Contract.ValueAtReturn(out tc) != null); tc = dummyTransferCmd; Token y; List/*!*/ xs; List ss = new List(); if (la.kind == 38) { Get(); y = t; Idents(out xs); foreach(IToken/*!*/ s in xs){ Contract.Assert(s != null); ss.Add(s.val); } tc = new GotoCmd(y, ss); } else if (la.kind == 39) { Get(); tc = new ReturnCmd(t); } else SynErr(107); Expect(8); } void IfCmd(out IfCmd/*!*/ ifcmd) { Contract.Ensures(Contract.ValueAtReturn(out ifcmd) != null); IToken/*!*/ x; Expr guard; StmtList/*!*/ thn; IfCmd/*!*/ elseIf; IfCmd elseIfOption = null; StmtList/*!*/ els; StmtList elseOption = null; Expect(40); x = t; Guard(out guard); Expect(27); StmtList(out thn); if (la.kind == 41) { Get(); if (la.kind == 40) { IfCmd(out elseIf); elseIfOption = elseIf; } else if (la.kind == 27) { Get(); StmtList(out els); elseOption = els; } else SynErr(108); } ifcmd = new IfCmd(x, guard, thn, elseIfOption, elseOption); } void WhileCmd(out WhileCmd/*!*/ wcmd) { Contract.Ensures(Contract.ValueAtReturn(out wcmd) != null); IToken/*!*/ x; Token z; Expr guard; Expr/*!*/ e; bool isFree; List invariants = new List(); StmtList/*!*/ body; QKeyValue kv = null; Expect(42); x = t; Guard(out guard); Contract.Assume(guard == null || cce.Owner.None(guard)); while (la.kind == 35 || la.kind == 43) { isFree = false; z = la/*lookahead token*/; if (la.kind == 35) { Get(); isFree = true; } Expect(43); while (la.kind == 27) { Attribute(ref kv); } Expression(out e); if (isFree) { invariants.Add(new AssumeCmd(z, e, kv)); } else { invariants.Add(new AssertCmd(z, e, kv)); } kv = null; Expect(8); } Expect(27); StmtList(out body); wcmd = new WhileCmd(x, guard, invariants, body); } void BreakCmd(out BreakCmd/*!*/ bcmd) { Contract.Ensures(Contract.ValueAtReturn(out bcmd) != null); IToken/*!*/ x; IToken/*!*/ y; string breakLabel = null; Expect(45); x = t; if (la.kind == 1) { Ident(out y); breakLabel = y.val; } Expect(8); bcmd = new BreakCmd(x, breakLabel); } void Guard(out Expr e) { Expr/*!*/ ee; e = null; Expect(9); if (la.kind == 44) { Get(); e = null; } else if (StartOf(9)) { Expression(out ee); e = ee; } else SynErr(109); Expect(10); } void LabelOrAssign(out Cmd c, out IToken label) { IToken/*!*/ id; IToken/*!*/ x, y; Expr/*!*/ e0; c = dummyCmd; label = null; AssignLhs/*!*/ lhs; List/*!*/ lhss; List/*!*/ rhss; List/*!*/ indexes; Ident(out id); x = t; if (la.kind == 11) { Get(); c = null; label = x; } else if (la.kind == 12 || la.kind == 17 || la.kind == 50) { lhss = new List(); lhs = new SimpleAssignLhs(id, new IdentifierExpr(id, id.val)); while (la.kind == 17) { MapAssignIndex(out y, out indexes); lhs = new MapAssignLhs(y, lhs, indexes); } lhss.Add(lhs); while (la.kind == 12) { Get(); Ident(out id); lhs = new SimpleAssignLhs(id, new IdentifierExpr(id, id.val)); while (la.kind == 17) { MapAssignIndex(out y, out indexes); lhs = new MapAssignLhs(y, lhs, indexes); } lhss.Add(lhs); } Expect(50); x = t; /* use location of := */ Expression(out e0); rhss = new List (); rhss.Add(e0); while (la.kind == 12) { Get(); Expression(out e0); rhss.Add(e0); } Expect(8); c = new AssignCmd(x, lhss, rhss); } else SynErr(110); } void CallCmd(out Cmd c) { Contract.Ensures(Contract.ValueAtReturn(out c) != null); IToken x; bool isAsync = false; bool isFree = false; QKeyValue kv = null; c = null; if (la.kind == 51) { Get(); isAsync = true; } if (la.kind == 35) { Get(); isFree = true; } Expect(52); x = t; while (la.kind == 27) { Attribute(ref kv); } CallParams(isAsync, isFree, kv, x, out c); } void ParCallCmd(out Cmd d) { Contract.Ensures(Contract.ValueAtReturn(out d) != null); IToken x; QKeyValue kv = null; Cmd c = null; List callCmds = new List(); Expect(53); x = t; while (la.kind == 27) { Attribute(ref kv); } CallParams(false, false, kv, x, out c); callCmds.Add((CallCmd)c); while (la.kind == 54) { Get(); CallParams(false, false, kv, x, out c); callCmds.Add((CallCmd)c); } Expect(8); d = new ParCallCmd(x, callCmds, kv); } void MapAssignIndex(out IToken/*!*/ x, out List/*!*/ indexes) { Contract.Ensures(Contract.ValueAtReturn(out x) != null); Contract.Ensures(cce.NonNullElements(Contract.ValueAtReturn(out indexes))); indexes = new List (); Expr/*!*/ e; Expect(17); x = t; if (StartOf(9)) { Expression(out e); indexes.Add(e); while (la.kind == 12) { Get(); Expression(out e); indexes.Add(e); } } Expect(18); } void CallParams(bool isAsync, bool isFree, QKeyValue kv, IToken x, out Cmd c) { List ids = new List(); List es = new List(); Expr en; IToken first; IToken p; c = null; Ident(out first); if (la.kind == 9) { Get(); if (StartOf(9)) { Expression(out en); es.Add(en); while (la.kind == 12) { Get(); Expression(out en); es.Add(en); } } Expect(10); c = new CallCmd(x, first.val, es, ids, kv); ((CallCmd) c).IsFree = isFree; ((CallCmd) c).IsAsync = isAsync; } else if (la.kind == 12 || la.kind == 50) { ids.Add(new IdentifierExpr(first, first.val)); if (la.kind == 12) { Get(); Ident(out p); ids.Add(new IdentifierExpr(p, p.val)); while (la.kind == 12) { Get(); Ident(out p); ids.Add(new IdentifierExpr(p, p.val)); } } Expect(50); Ident(out first); Expect(9); if (StartOf(9)) { Expression(out en); es.Add(en); while (la.kind == 12) { Get(); Expression(out en); es.Add(en); } } Expect(10); c = new CallCmd(x, first.val, es, ids, kv); ((CallCmd) c).IsFree = isFree; ((CallCmd) c).IsAsync = isAsync; } else SynErr(111); } void Expressions(out List/*!*/ es) { Contract.Ensures(Contract.ValueAtReturn(out es) != null); Expr/*!*/ e; es = new List(); Expression(out e); es.Add(e); while (la.kind == 12) { Get(); Expression(out e); es.Add(e); } } void ImpliesExpression(bool noExplies, out Expr/*!*/ e0) { Contract.Ensures(Contract.ValueAtReturn(out e0) != null); IToken/*!*/ x; Expr/*!*/ e1; LogicalExpression(out e0); if (StartOf(10)) { if (la.kind == 57 || la.kind == 58) { ImpliesOp(); x = t; ImpliesExpression(true, out e1); e0 = Expr.Binary(x, BinaryOperator.Opcode.Imp, e0, e1); } else { ExpliesOp(); if (noExplies) this.SemErr("illegal mixture of ==> and <==, use parentheses to disambiguate"); x = t; LogicalExpression(out e1); e0 = Expr.Binary(x, BinaryOperator.Opcode.Imp, e1, e0); while (la.kind == 59 || la.kind == 60) { ExpliesOp(); x = t; LogicalExpression(out e1); e0 = Expr.Binary(x, BinaryOperator.Opcode.Imp, e1, e0); } } } } void EquivOp() { if (la.kind == 55) { Get(); } else if (la.kind == 56) { Get(); } else SynErr(112); } void LogicalExpression(out Expr/*!*/ e0) { Contract.Ensures(Contract.ValueAtReturn(out e0) != null); IToken/*!*/ x; Expr/*!*/ e1; RelationalExpression(out e0); if (StartOf(11)) { if (la.kind == 61 || la.kind == 62) { AndOp(); x = t; RelationalExpression(out e1); e0 = Expr.Binary(x, BinaryOperator.Opcode.And, e0, e1); while (la.kind == 61 || la.kind == 62) { AndOp(); x = t; RelationalExpression(out e1); e0 = Expr.Binary(x, BinaryOperator.Opcode.And, e0, e1); } } else { OrOp(); x = t; RelationalExpression(out e1); e0 = Expr.Binary(x, BinaryOperator.Opcode.Or, e0, e1); while (la.kind == 63 || la.kind == 64) { OrOp(); x = t; RelationalExpression(out e1); e0 = Expr.Binary(x, BinaryOperator.Opcode.Or, e0, e1); } } } } void ImpliesOp() { if (la.kind == 57) { Get(); } else if (la.kind == 58) { Get(); } else SynErr(113); } void ExpliesOp() { if (la.kind == 59) { Get(); } else if (la.kind == 60) { Get(); } else SynErr(114); } void RelationalExpression(out Expr/*!*/ e0) { Contract.Ensures(Contract.ValueAtReturn(out e0) != null); IToken/*!*/ x; Expr/*!*/ e1; BinaryOperator.Opcode op; BvTerm(out e0); if (StartOf(12)) { RelOp(out x, out op); BvTerm(out e1); e0 = Expr.Binary(x, op, e0, e1); } } void AndOp() { if (la.kind == 61) { Get(); } else if (la.kind == 62) { Get(); } else SynErr(115); } void OrOp() { if (la.kind == 63) { Get(); } else if (la.kind == 64) { Get(); } else SynErr(116); } void BvTerm(out Expr/*!*/ e0) { Contract.Ensures(Contract.ValueAtReturn(out e0) != null); IToken/*!*/ x; Expr/*!*/ e1; Term(out e0); while (la.kind == 73) { Get(); x = t; Term(out e1); e0 = new BvConcatExpr(x, e0, e1); } } void RelOp(out IToken/*!*/ x, out BinaryOperator.Opcode op) { Contract.Ensures(Contract.ValueAtReturn(out x) != null); x = Token.NoToken; op=BinaryOperator.Opcode.Add/*(dummy)*/; switch (la.kind) { case 65: { Get(); x = t; op=BinaryOperator.Opcode.Eq; break; } case 19: { Get(); x = t; op=BinaryOperator.Opcode.Lt; break; } case 20: { Get(); x = t; op=BinaryOperator.Opcode.Gt; break; } case 66: { Get(); x = t; op=BinaryOperator.Opcode.Le; break; } case 67: { Get(); x = t; op=BinaryOperator.Opcode.Ge; break; } case 68: { Get(); x = t; op=BinaryOperator.Opcode.Neq; break; } case 69: { Get(); x = t; op=BinaryOperator.Opcode.Subtype; break; } case 70: { Get(); x = t; op=BinaryOperator.Opcode.Neq; break; } case 71: { Get(); x = t; op=BinaryOperator.Opcode.Le; break; } case 72: { Get(); x = t; op=BinaryOperator.Opcode.Ge; break; } default: SynErr(117); break; } } void Term(out Expr/*!*/ e0) { Contract.Ensures(Contract.ValueAtReturn(out e0) != null); IToken/*!*/ x; Expr/*!*/ e1; BinaryOperator.Opcode op; Factor(out e0); while (la.kind == 74 || la.kind == 75) { AddOp(out x, out op); Factor(out e1); e0 = Expr.Binary(x, op, e0, e1); } } void Factor(out Expr/*!*/ e0) { Contract.Ensures(Contract.ValueAtReturn(out e0) != null); IToken/*!*/ x; Expr/*!*/ e1; BinaryOperator.Opcode op; Power(out e0); while (StartOf(13)) { MulOp(out x, out op); Power(out e1); e0 = Expr.Binary(x, op, e0, e1); } } void AddOp(out IToken/*!*/ x, out BinaryOperator.Opcode op) { Contract.Ensures(Contract.ValueAtReturn(out x) != null); x = Token.NoToken; op=BinaryOperator.Opcode.Add/*(dummy)*/; if (la.kind == 74) { Get(); x = t; op=BinaryOperator.Opcode.Add; } else if (la.kind == 75) { Get(); x = t; op=BinaryOperator.Opcode.Sub; } else SynErr(118); } void Power(out Expr/*!*/ e0) { Contract.Ensures(Contract.ValueAtReturn(out e0) != null); IToken/*!*/ x; Expr/*!*/ e1; UnaryExpression(out e0); if (la.kind == 79) { Get(); x = t; Power(out e1); e0 = Expr.Binary(x, BinaryOperator.Opcode.Pow, e0, e1); } } void MulOp(out IToken/*!*/ x, out BinaryOperator.Opcode op) { Contract.Ensures(Contract.ValueAtReturn(out x) != null); x = Token.NoToken; op=BinaryOperator.Opcode.Add/*(dummy)*/; if (la.kind == 44) { Get(); x = t; op=BinaryOperator.Opcode.Mul; } else if (la.kind == 76) { Get(); x = t; op=BinaryOperator.Opcode.Div; } else if (la.kind == 77) { Get(); x = t; op=BinaryOperator.Opcode.Mod; } else if (la.kind == 78) { Get(); x = t; op=BinaryOperator.Opcode.RealDiv; } else SynErr(119); } void UnaryExpression(out Expr/*!*/ e) { Contract.Ensures(Contract.ValueAtReturn(out e) != null); IToken/*!*/ x; e = dummyExpr; if (la.kind == 75) { Get(); x = t; UnaryExpression(out e); e = Expr.Unary(x, UnaryOperator.Opcode.Neg, e); } else if (la.kind == 80 || la.kind == 81) { NegOp(); x = t; UnaryExpression(out e); e = Expr.Unary(x, UnaryOperator.Opcode.Not, e); } else if (StartOf(14)) { CoercionExpression(out e); } else SynErr(120); } void NegOp() { if (la.kind == 80) { Get(); } else if (la.kind == 81) { Get(); } else SynErr(121); } void CoercionExpression(out Expr/*!*/ e) { Contract.Ensures(Contract.ValueAtReturn(out e) != null); IToken/*!*/ x; Bpl.Type/*!*/ coercedTo; BigNum bn; ArrayExpression(out e); while (la.kind == 11) { Get(); x = t; if (StartOf(6)) { Type(out coercedTo); e = Expr.CoerceType(x, e, coercedTo); } else if (la.kind == 3) { Nat(out bn); if (!(e is LiteralExpr) || !((LiteralExpr)e).isBigNum) { this.SemErr("arguments of extract need to be integer literals"); e = new BvBounds(x, bn, BigNum.ZERO); } else { e = new BvBounds(x, bn, ((LiteralExpr)e).asBigNum); } } else SynErr(122); } } void ArrayExpression(out Expr/*!*/ e) { Contract.Ensures(Contract.ValueAtReturn(out e) != null); IToken/*!*/ x; Expr/*!*/ index0 = dummyExpr; Expr/*!*/ e1; bool store; bool bvExtract; List/*!*/ allArgs = dummyExprSeq; AtomExpression(out e); while (la.kind == 17) { Get(); x = t; allArgs = new List (); allArgs.Add(e); store = false; bvExtract = false; if (StartOf(15)) { if (StartOf(9)) { Expression(out index0); if (index0 is BvBounds) bvExtract = true; else allArgs.Add(index0); while (la.kind == 12) { Get(); Expression(out e1); if (bvExtract || e1 is BvBounds) this.SemErr("bitvectors only have one dimension"); allArgs.Add(e1); } if (la.kind == 50) { Get(); Expression(out e1); if (bvExtract || e1 is BvBounds) this.SemErr("assignment to bitvectors is not possible"); allArgs.Add(e1); store = true; } } else { Get(); Expression(out e1); allArgs.Add(e1); store = true; } } Expect(18); if (store) e = new NAryExpr(x, new MapStore(x, allArgs.Count - 2), allArgs); else if (bvExtract) e = new BvExtractExpr(x, e, ((BvBounds)index0).Upper.ToIntSafe, ((BvBounds)index0).Lower.ToIntSafe); else e = new NAryExpr(x, new MapSelect(x, allArgs.Count - 1), allArgs); } } void Nat(out BigNum n) { Expect(3); try { n = BigNum.FromString(t.val); } catch (FormatException) { this.SemErr("incorrectly formatted number"); n = BigNum.ZERO; } } void AtomExpression(out Expr/*!*/ e) { Contract.Ensures(Contract.ValueAtReturn(out e) != null); IToken/*!*/ x; int n; BigNum bn; BigDec bd; List/*!*/ es; List/*!*/ ds; Trigger trig; List/*!*/ typeParams; IdentifierExpr/*!*/ id; QKeyValue kv; e = dummyExpr; List/*!*/ locals; List/*!*/ blocks; switch (la.kind) { case 82: { Get(); e = new LiteralExpr(t, false); break; } case 83: { Get(); e = new LiteralExpr(t, true); break; } case 3: { Nat(out bn); e = new LiteralExpr(t, bn); break; } case 5: case 6: { Dec(out bd); e = new LiteralExpr(t, bd); break; } case 2: { BvLit(out bn, out n); e = new LiteralExpr(t, bn, n); break; } case 1: { Ident(out x); id = new IdentifierExpr(x, x.val); e = id; if (la.kind == 9) { Get(); if (StartOf(9)) { Expressions(out es); e = new NAryExpr(x, new FunctionCall(id), es); } else if (la.kind == 10) { e = new NAryExpr(x, new FunctionCall(id), new List()); } else SynErr(123); Expect(10); } break; } case 84: { Get(); x = t; Expect(9); Expression(out e); Expect(10); e = new OldExpr(x, e); break; } case 14: { Get(); x = t; Expect(9); Expression(out e); Expect(10); e = new NAryExpr(x, new ArithmeticCoercion(x, ArithmeticCoercion.CoercionType.ToInt), new List{ e }); break; } case 15: { Get(); x = t; Expect(9); Expression(out e); Expect(10); e = new NAryExpr(x, new ArithmeticCoercion(x, ArithmeticCoercion.CoercionType.ToReal), new List{ e }); break; } case 9: { Get(); if (StartOf(9)) { Expression(out e); if (e is BvBounds) this.SemErr("parentheses around bitvector bounds " + "are not allowed"); } else if (la.kind == 88 || la.kind == 89) { Forall(); x = t; QuantifierBody(x, out typeParams, out ds, out kv, out trig, out e); if (typeParams.Count + ds.Count > 0) e = new ForallExpr(x, typeParams, ds, kv, trig, e); } else if (la.kind == 90 || la.kind == 91) { Exists(); x = t; QuantifierBody(x, out typeParams, out ds, out kv, out trig, out e); if (typeParams.Count + ds.Count > 0) e = new ExistsExpr(x, typeParams, ds, kv, trig, e); } else if (la.kind == 92 || la.kind == 93) { Lambda(); x = t; QuantifierBody(x, out typeParams, out ds, out kv, out trig, out e); if (trig != null) SemErr("triggers not allowed in lambda expressions"); if (typeParams.Count + ds.Count > 0) e = new LambdaExpr(x, typeParams, ds, kv, e); } else SynErr(124); Expect(10); break; } case 40: { IfThenElseExpression(out e); break; } case 85: { CodeExpression(out locals, out blocks); e = new CodeExpr(locals, blocks); break; } default: SynErr(125); break; } } void Dec(out BigDec n) { string s = ""; if (la.kind == 5) { Get(); s = t.val; } else if (la.kind == 6) { Get(); s = t.val; } else SynErr(126); try { n = BigDec.FromString(s); } catch (FormatException) { this.SemErr("incorrectly formatted number"); n = BigDec.ZERO; } } void BvLit(out BigNum n, out int m) { Expect(2); int pos = t.val.IndexOf("bv"); string a = t.val.Substring(0, pos); string b = t.val.Substring(pos + 2); try { n = BigNum.FromString(a); m = Convert.ToInt32(b); } catch (FormatException) { this.SemErr("incorrectly formatted bitvector"); n = BigNum.ZERO; m = 0; } } void Forall() { if (la.kind == 88) { Get(); } else if (la.kind == 89) { Get(); } else SynErr(127); } void QuantifierBody(IToken/*!*/ q, out List/*!*/ typeParams, out List/*!*/ ds, out QKeyValue kv, out Trigger trig, out Expr/*!*/ body) { Contract.Requires(q != null); Contract.Ensures(Contract.ValueAtReturn(out typeParams) != null); Contract.Ensures(Contract.ValueAtReturn(out ds) != null); Contract.Ensures(Contract.ValueAtReturn(out body) != null); trig = null; typeParams = new List (); IToken/*!*/ tok; kv = null; ds = new List (); if (la.kind == 19) { TypeParams(out tok, out typeParams); if (la.kind == 1 || la.kind == 27) { BoundVars(q, out ds); } } else if (la.kind == 1 || la.kind == 27) { BoundVars(q, out ds); } else SynErr(128); QSep(); while (la.kind == 27) { AttributeOrTrigger(ref kv, ref trig); } Expression(out body); } void Exists() { if (la.kind == 90) { Get(); } else if (la.kind == 91) { Get(); } else SynErr(129); } void Lambda() { if (la.kind == 92) { Get(); } else if (la.kind == 93) { Get(); } else SynErr(130); } void IfThenElseExpression(out Expr/*!*/ e) { Contract.Ensures(Contract.ValueAtReturn(out e) != null); IToken/*!*/ tok; Expr/*!*/ e0, e1, e2; e = dummyExpr; Expect(40); tok = t; Expression(out e0); Expect(87); Expression(out e1); Expect(41); Expression(out e2); e = new NAryExpr(tok, new IfThenElse(tok), new List{ e0, e1, e2 }); } void CodeExpression(out List/*!*/ locals, out List/*!*/ blocks) { Contract.Ensures(Contract.ValueAtReturn(out locals) != null); Contract.Ensures(cce.NonNullElements(Contract.ValueAtReturn(out blocks))); locals = new List(); Block/*!*/ b; blocks = new List(); Expect(85); while (la.kind == 7) { LocalVars(locals); } SpecBlock(out b); blocks.Add(b); while (la.kind == 1) { SpecBlock(out b); blocks.Add(b); } Expect(86); } void SpecBlock(out Block/*!*/ b) { Contract.Ensures(Contract.ValueAtReturn(out b) != null); IToken/*!*/ x; IToken/*!*/ y; Cmd c; IToken label; List cs = new List(); List/*!*/ xs; List ss = new List(); b = dummyBlock; Expr/*!*/ e; Ident(out x); Expect(11); while (StartOf(8)) { LabelOrCmd(out c, out label); if (c != null) { Contract.Assert(label == null); cs.Add(c); } else { Contract.Assert(label != null); SemErr("SpecBlock's can only have one label"); } } if (la.kind == 38) { Get(); y = t; Idents(out xs); foreach(IToken/*!*/ s in xs){ Contract.Assert(s != null); ss.Add(s.val); } b = new Block(x,x.val,cs,new GotoCmd(y,ss)); } else if (la.kind == 39) { Get(); Expression(out e); b = new Block(x,x.val,cs,new ReturnExprCmd(t,e)); } else SynErr(131); Expect(8); } void AttributeOrTrigger(ref QKeyValue kv, ref Trigger trig) { IToken/*!*/ tok; Expr/*!*/ e; List/*!*/ es; string key; List parameters; object/*!*/ param; Expect(27); tok = t; if (la.kind == 11) { Get(); Expect(1); key = t.val; parameters = new List(); if (StartOf(16)) { AttributeParameter(out param); parameters.Add(param); while (la.kind == 12) { Get(); AttributeParameter(out param); parameters.Add(param); } } if (key == "nopats") { if (parameters.Count == 1 && parameters[0] is Expr) { e = (Expr)parameters[0]; if(trig==null){ trig = new Trigger(tok, false, new List { e }, null); } else { trig.AddLast(new Trigger(tok, false, new List { e }, null)); } } else { this.SemErr("the 'nopats' quantifier attribute expects a string-literal parameter"); } } else { if (kv==null) { kv = new QKeyValue(tok, key, parameters, null); } else { kv.AddLast(new QKeyValue(tok, key, parameters, null)); } } } else if (StartOf(9)) { Expression(out e); es = new List { e }; while (la.kind == 12) { Get(); Expression(out e); es.Add(e); } if (trig==null) { trig = new Trigger(tok, true, es, null); } else { trig.AddLast(new Trigger(tok, true, es, null)); } } else SynErr(132); Expect(28); } void AttributeParameter(out object/*!*/ o) { Contract.Ensures(Contract.ValueAtReturn(out o) != null); o = "error"; Expr/*!*/ e; if (la.kind == 4) { Get(); o = t.val.Substring(1, t.val.Length-2); } else if (StartOf(9)) { Expression(out e); o = e; } else SynErr(133); } void QSep() { if (la.kind == 94) { Get(); } else if (la.kind == 95) { Get(); } else SynErr(134); } public void Parse() { la = new Token(); la.val = ""; Get(); BoogiePL(); Expect(0); Expect(0); } static readonly bool[,]/*!*/ set = { {T,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x}, {x,x,x,x, x,x,x,T, x,x,x,x, x,x,x,x, x,x,x,x, x,T,x,x, x,T,x,x, x,T,T,x, T,T,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x}, {x,T,x,x, x,x,x,x, x,T,x,x, x,x,T,T, T,T,x,T, x,x,x,x, x,x,x,T, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x}, {x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,T,T, T,T,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x}, {x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,T, x,x,x,x, x,x,T,T, T,T,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x}, {x,x,x,x, x,x,x,x, x,T,x,x, x,x,T,T, T,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x}, {x,T,x,x, x,x,x,x, x,T,x,x, x,x,T,T, T,T,x,T, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x}, {x,T,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,T, x,x,T,T, T,x,T,x, x,T,T,T, T,T,x,T, T,T,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x}, {x,T,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,T, x,x,x,x, x,x,x,x, x,x,T,T, T,T,x,T, T,T,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x}, {x,T,T,T, x,T,T,x, x,T,x,x, x,x,T,T, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, T,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,T, x,x,x,x, T,T,T,T, T,T,x,x, x,x,x,x, x,x,x,x, x,x}, {x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,T,T,T, T,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x}, {x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,T,T,T, T,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x}, {x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,T, T,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,T,T,T, T,T,T,T, T,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x}, {x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, T,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, T,T,T,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x}, {x,T,T,T, x,T,T,x, x,T,x,x, x,x,T,T, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, T,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,T,T, T,T,x,x, x,x,x,x, x,x,x,x, x,x}, {x,T,T,T, x,T,T,x, x,T,x,x, x,x,T,T, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, T,x,x,x, x,x,x,x, x,x,T,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,T, x,x,x,x, T,T,T,T, T,T,x,x, x,x,x,x, x,x,x,x, x,x}, {x,T,T,T, T,T,T,x, x,T,x,x, x,x,T,T, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, T,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,T, x,x,x,x, T,T,T,T, T,T,x,x, x,x,x,x, x,x,x,x, x,x} }; } // end Parser public class Errors { public int count = 0; // number of errors detected public System.IO.TextWriter/*!*/ errorStream = Console.Out; // error messages go to this stream public string errMsgFormat = "{0}({1},{2}): error: {3}"; // 0=filename, 1=line, 2=column, 3=text public string warningMsgFormat = "{0}({1},{2}): warning: {3}"; // 0=filename, 1=line, 2=column, 3=text public void SynErr(string filename, int line, int col, int n) { SynErr(filename, line, col, GetSyntaxErrorString(n)); } public virtual void SynErr(string filename, int line, int col, string/*!*/ msg) { Contract.Requires(msg != null); errorStream.WriteLine(errMsgFormat, filename, line, col, msg); count++; } string GetSyntaxErrorString(int n) { string s; switch (n) { case 0: s = "EOF expected"; break; case 1: s = "ident expected"; break; case 2: s = "bvlit expected"; break; case 3: s = "digits expected"; break; case 4: s = "string expected"; break; case 5: s = "decimal expected"; break; case 6: s = "float expected"; break; case 7: s = "\"var\" expected"; break; case 8: s = "\";\" expected"; break; case 9: s = "\"(\" expected"; break; case 10: s = "\")\" expected"; break; case 11: s = "\":\" expected"; break; case 12: s = "\",\" expected"; break; case 13: s = "\"where\" expected"; break; case 14: s = "\"int\" expected"; break; case 15: s = "\"real\" expected"; break; case 16: s = "\"bool\" expected"; break; case 17: s = "\"[\" expected"; break; case 18: s = "\"]\" expected"; break; case 19: s = "\"<\" expected"; break; case 20: s = "\">\" expected"; break; case 21: s = "\"const\" expected"; break; case 22: s = "\"unique\" expected"; break; case 23: s = "\"extends\" expected"; break; case 24: s = "\"complete\" expected"; break; case 25: s = "\"function\" expected"; break; case 26: s = "\"returns\" expected"; break; case 27: s = "\"{\" expected"; break; case 28: s = "\"}\" expected"; break; case 29: s = "\"axiom\" expected"; break; case 30: s = "\"type\" expected"; break; case 31: s = "\"=\" expected"; break; case 32: s = "\"procedure\" expected"; break; case 33: s = "\"implementation\" expected"; break; case 34: s = "\"modifies\" expected"; break; case 35: s = "\"free\" expected"; break; case 36: s = "\"requires\" expected"; break; case 37: s = "\"ensures\" expected"; break; case 38: s = "\"goto\" expected"; break; case 39: s = "\"return\" expected"; break; case 40: s = "\"if\" expected"; break; case 41: s = "\"else\" expected"; break; case 42: s = "\"while\" expected"; break; case 43: s = "\"invariant\" expected"; break; case 44: s = "\"*\" expected"; break; case 45: s = "\"break\" expected"; break; case 46: s = "\"assert\" expected"; break; case 47: s = "\"assume\" expected"; break; case 48: s = "\"havoc\" expected"; break; case 49: s = "\"yield\" expected"; break; case 50: s = "\":=\" expected"; break; case 51: s = "\"async\" expected"; break; case 52: s = "\"call\" expected"; break; case 53: s = "\"par\" expected"; break; case 54: s = "\"|\" expected"; break; case 55: s = "\"<==>\" expected"; break; case 56: s = "\"\\u21d4\" expected"; break; case 57: s = "\"==>\" expected"; break; case 58: s = "\"\\u21d2\" expected"; break; case 59: s = "\"<==\" expected"; break; case 60: s = "\"\\u21d0\" expected"; break; case 61: s = "\"&&\" expected"; break; case 62: s = "\"\\u2227\" expected"; break; case 63: s = "\"||\" expected"; break; case 64: s = "\"\\u2228\" expected"; break; case 65: s = "\"==\" expected"; break; case 66: s = "\"<=\" expected"; break; case 67: s = "\">=\" expected"; break; case 68: s = "\"!=\" expected"; break; case 69: s = "\"<:\" expected"; break; case 70: s = "\"\\u2260\" expected"; break; case 71: s = "\"\\u2264\" expected"; break; case 72: s = "\"\\u2265\" expected"; break; case 73: s = "\"++\" expected"; break; case 74: s = "\"+\" expected"; break; case 75: s = "\"-\" expected"; break; case 76: s = "\"div\" expected"; break; case 77: s = "\"mod\" expected"; break; case 78: s = "\"/\" expected"; break; case 79: s = "\"**\" expected"; break; case 80: s = "\"!\" expected"; break; case 81: s = "\"\\u00ac\" expected"; break; case 82: s = "\"false\" expected"; break; case 83: s = "\"true\" expected"; break; case 84: s = "\"old\" expected"; break; case 85: s = "\"|{\" expected"; break; case 86: s = "\"}|\" expected"; break; case 87: s = "\"then\" expected"; break; case 88: s = "\"forall\" expected"; break; case 89: s = "\"\\u2200\" expected"; break; case 90: s = "\"exists\" expected"; break; case 91: s = "\"\\u2203\" expected"; break; case 92: s = "\"lambda\" expected"; break; case 93: s = "\"\\u03bb\" expected"; break; case 94: s = "\"::\" expected"; break; case 95: s = "\"\\u2022\" expected"; break; case 96: s = "??? expected"; break; case 97: s = "invalid Function"; break; case 98: s = "invalid Function"; break; case 99: s = "invalid Procedure"; break; case 100: s = "invalid Type"; break; case 101: s = "invalid TypeAtom"; break; case 102: s = "invalid TypeArgs"; break; case 103: s = "invalid Spec"; break; case 104: s = "invalid SpecPrePost"; break; case 105: s = "invalid LabelOrCmd"; break; case 106: s = "invalid StructuredCmd"; break; case 107: s = "invalid TransferCmd"; break; case 108: s = "invalid IfCmd"; break; case 109: s = "invalid Guard"; break; case 110: s = "invalid LabelOrAssign"; break; case 111: s = "invalid CallParams"; break; case 112: s = "invalid EquivOp"; break; case 113: s = "invalid ImpliesOp"; break; case 114: s = "invalid ExpliesOp"; break; case 115: s = "invalid AndOp"; break; case 116: s = "invalid OrOp"; break; case 117: s = "invalid RelOp"; break; case 118: s = "invalid AddOp"; break; case 119: s = "invalid MulOp"; break; case 120: s = "invalid UnaryExpression"; break; case 121: s = "invalid NegOp"; break; case 122: s = "invalid CoercionExpression"; break; case 123: s = "invalid AtomExpression"; break; case 124: s = "invalid AtomExpression"; break; case 125: s = "invalid AtomExpression"; break; case 126: s = "invalid Dec"; break; case 127: s = "invalid Forall"; break; case 128: s = "invalid QuantifierBody"; break; case 129: s = "invalid Exists"; break; case 130: s = "invalid Lambda"; break; case 131: s = "invalid SpecBlock"; break; case 132: s = "invalid AttributeOrTrigger"; break; case 133: s = "invalid AttributeParameter"; break; case 134: s = "invalid QSep"; break; default: s = "error " + n; break; } return s; } public void SemErr(IToken/*!*/ tok, string/*!*/ msg) { // semantic errors Contract.Requires(tok != null); Contract.Requires(msg != null); SemErr(tok.filename, tok.line, tok.col, msg); } public virtual void SemErr(string filename, int line, int col, string/*!*/ msg) { Contract.Requires(msg != null); errorStream.WriteLine(errMsgFormat, filename, line, col, msg); count++; } public void Warning(IToken/*!*/ tok, string/*!*/ msg) { // warnings Contract.Requires(tok != null); Contract.Requires(msg != null); Warning(tok.filename, tok.line, tok.col, msg); } public virtual void Warning(string filename, int line, int col, string msg) { Contract.Requires(msg != null); errorStream.WriteLine(warningMsgFormat, filename, line, col, msg); } } // Errors public class FatalError: Exception { public FatalError(string m): base(m) {} }