diff options
| author |  tabarbe <unknown> | 2010-08-20 22:32:24 +0000 |
|---|---|---|
| committer | tabarbe <unknown> | 2010-08-20 22:32:24 +0000 |
| commit | 72b39a6962d7f6c7ca1aab9919791238c7baba3f (patch) | |
| tree | 75bb9c1b956d1b368f4cf2983a20a913211dd350 /Source/Core/ResolutionContext.cs | |
| parent | 96d9624e9e22dbe9090e0bd7d538cafbf0a16463 (diff) | |
Boogie: Committing changed source files
Diffstat (limited to 'Source/Core/ResolutionContext.cs')
| -rw-r--r-- | Source/Core/ResolutionContext.cs | 995 |
1 files changed, 516 insertions, 479 deletions
diff --git a/Source/Core/ResolutionContext.cs b/Source/Core/ResolutionContext.cs index 10ff7d87..93018097 100644 --- a/Source/Core/ResolutionContext.cs +++ b/Source/Core/ResolutionContext.cs @@ -3,537 +3,574 @@ // Copyright (C) Microsoft Corporation. All Rights Reserved.
//
//-----------------------------------------------------------------------------
-namespace Microsoft.Boogie
-{
- using System.Collections;
- using System.Collections.Generic;
- using System;
- using Microsoft.SpecSharp.Collections;
- using Microsoft.Contracts;
-
- public interface IErrorSink
- {
- void Error(IToken! tok, string! msg);
- }
-
- public class CheckingContext
- {
- // ------------------------------ Error counting ------------------------------
-
- IErrorSink errorSink;
- int errors;
-
- public CheckingContext(IErrorSink errorSink)
- {
- this.errorSink = errorSink;
- }
-
- public int ErrorCount
- {
- get { return errors; }
- set { errors = value; }
- }
+namespace Microsoft.Boogie {
+ using System.Collections;
+ using System.Collections.Generic;
+ using System;
+ using Microsoft.SpecSharp.Collections;
+ using System.Diagnostics.Contracts;
+
+ [ContractClass(typeof(IErrorSinkContracts))]
+ public interface IErrorSink {
+ void Error(IToken/*!*/ tok, string/*!*/ msg);
+ }
+ [ContractClassFor(typeof(IErrorSink))]
+ public abstract class IErrorSinkContracts : IErrorSink {
+ #region IErrorSink Members
+ public void Error(IToken tok, string msg) {
+ Contract.Requires(tok != null);
+ Contract.Requires(msg != null);
+ throw new NotImplementedException();
+ }
+ #endregion
+ }
- public void Error(Absy! subject, string! msg, params object[]! args)
- {
- Error(subject.tok, msg, args);
- }
+ public class CheckingContext {
+ // ------------------------------ Error counting ------------------------------
- public virtual void Error(IToken! tok, string! msg)
- {
- errors++;
- if (errorSink == null) {
- ConsoleColor col = Console.ForegroundColor;
- Console.ForegroundColor = ConsoleColor.Red;
- Console.WriteLine("{0}({1},{2}): Error: {3}",
- tok.filename, tok.line, tok.col-1,
- msg);
- Console.ForegroundColor = col;
- } else {
- errorSink.Error(tok, msg);
- }
- }
+ IErrorSink errorSink;
+ int errors;
- private string! Format(string! msg, params object[] args) {
- if (System.Type.GetType("Mono.Runtime") != null) { // MONO
- // something in mono seems to be broken so that calling
- // NamedDeclarations.ToString (and similar ToString methods)
- // causes a stack overflow. We therefore convert those to
- // strings by hand
- object[] fixedArgs = new object [((!)args).Length];
- for (int i = 0; i < args.Length; ++i) {
- if (args[i] is NamedDeclaration) {
- fixedArgs[i] = ((NamedDeclaration!)args[i]).Name;
- } else if (args[i] is Type) {
- System.IO.StringWriter buffer = new System.IO.StringWriter();
- using (TokenTextWriter stream = new TokenTextWriter("<buffer>", buffer, false)) {
- ((Type!)args[i]).Emit(stream);
- }
- fixedArgs[i] = buffer.ToString();
- } else if (args[i] is Expr) {
- System.IO.StringWriter buffer = new System.IO.StringWriter();
- using (TokenTextWriter stream = new TokenTextWriter("<buffer>", buffer, false)) {
- ((Expr!)args[i]).Emit(stream, 0, false);
- }
- fixedArgs[i] = buffer.ToString();
- } else {
- fixedArgs[i] = args[i];
- }
+ public CheckingContext(IErrorSink errorSink) {
+ this.errorSink = errorSink;
+ }
+
+ public int ErrorCount {
+ get {
+ return errors;
+ }
+ set {
+ errors = value;
+ }
+ }
+
+ public void Error(Absy subject, string msg, params object[] args) {
+ Contract.Requires(args != null);
+ Contract.Requires(msg != null);
+ Contract.Requires(subject != null);
+ Error(subject.tok, msg, args);
+ }
+
+ public virtual void Error(IToken tok, string msg) {
+ Contract.Requires(msg != null);
+ Contract.Requires(tok != null);
+ errors++;
+ if (errorSink == null) {
+ ConsoleColor col = Console.ForegroundColor;
+ Console.ForegroundColor = ConsoleColor.Red;
+ Console.WriteLine("{0}({1},{2}): Error: {3}",
+ tok.filename, tok.line, tok.col - 1,
+ msg);
+ Console.ForegroundColor = col;
+ } else {
+ errorSink.Error(tok, msg);
+ }
+ }
+
+ private string Format(string msg, params object[] args) {
+ Contract.Requires(msg != null);
+ Contract.Ensures(Contract.Result<string>() != null);
+ if (System.Type.GetType("Mono.Runtime") != null) { // MONO
+ // something in mono seems to be broken so that calling
+ // NamedDeclarations.ToString (and similar ToString methods)
+ // causes a stack overflow. We therefore convert those to
+ // strings by hand
+ object[] fixedArgs = new object[cce.NonNull(args).Length];
+ for (int i = 0; i < args.Length; ++i) {
+ if (args[i] is NamedDeclaration) {
+ fixedArgs[i] = cce.NonNull((NamedDeclaration)args[i]).Name;
+ } else if (args[i] is Type) {
+ System.IO.StringWriter buffer = new System.IO.StringWriter();
+ using (TokenTextWriter stream = new TokenTextWriter("<buffer>", buffer, false)) {
+ cce.NonNull((Type)args[i]).Emit(stream);
+ }
+ fixedArgs[i] = buffer.ToString();
+ } else if (args[i] is Expr) {
+ System.IO.StringWriter buffer = new System.IO.StringWriter();
+ using (TokenTextWriter stream = new TokenTextWriter("<buffer>", buffer, false)) {
+ cce.NonNull((Expr/*!*/)args[i]).Emit(stream, 0, false);
}
- args = fixedArgs;
+ fixedArgs[i] = buffer.ToString();
+ } else {
+ fixedArgs[i] = args[i];
}
- return string.Format(msg, args);
}
+ args = fixedArgs;
+ }
+ return string.Format(msg, args);
+ }
- public void Error(IToken! tok, string! msg, params object[] args)
- {
- Error(tok, Format(msg, args));
- }
+ public void Error(IToken tok, string msg, params object[] args) {
+ Contract.Requires(msg != null);
+ Contract.Requires(tok != null);
+ Error(tok, Format(msg, args));
+ }
- public void Warning(Absy! subject, string! msg, params object[]! args)
- {
- Warning(subject.tok, msg, args);
- }
+ public void Warning(Absy subject, string msg, params object[] args) {
+ Contract.Requires(args != null);
+ Contract.Requires(msg != null);
+ Contract.Requires(subject != null);
+ Warning(subject.tok, msg, args);
+ }
- public virtual void Warning(IToken! tok, string! msg)
- {
- // warnings are currently always written to the console
- ConsoleColor col = Console.ForegroundColor;
- Console.ForegroundColor = ConsoleColor.DarkYellow;
- Console.WriteLine("{0}({1},{2}): Warning: {3}",
- tok.filename, tok.line, tok.col-1,
- msg);
- Console.ForegroundColor = col;
- }
+ public virtual void Warning(IToken tok, string msg) {
+ Contract.Requires(msg != null);
+ Contract.Requires(tok != null);
+ // warnings are currently always written to the console
+ ConsoleColor col = Console.ForegroundColor;
+ Console.ForegroundColor = ConsoleColor.DarkYellow;
+ Console.WriteLine("{0}({1},{2}): Warning: {3}",
+ tok.filename, tok.line, tok.col - 1,
+ msg);
+ Console.ForegroundColor = col;
+ }
- public void Warning(IToken! tok, string! msg, params object[] args)
- {
- Warning(tok, Format(msg, args));
- }
+ public void Warning(IToken tok, string msg, params object[] args) {
+ Contract.Requires(msg != null);
+ Contract.Requires(tok != null);
+ Warning(tok, Format(msg, args));
}
+ }
- public class ResolutionContext : CheckingContext
- {
- public ResolutionContext(IErrorSink errorSink)
- {
- base(errorSink);
- }
-
- // ------------------------------ Boogie 2 Types -------------------------
-
- // user-defined types, which can be either TypeCtorDecl or TypeSynonymDecl
- Hashtable /*string->NamedDeclaration*/! types = new Hashtable /*string->NamedDeclaration*/ ();
-
- /// <summary>
- /// Checks if name coincides with the name of a bitvector type. If so, reports an error and
- /// returns true; otherwise, returns false.
- /// </summary>
- private bool CheckBvNameClashes(Absy! absy, string! name) {
- if (name.StartsWith("bv") && name.Length > 2) {
- for (int i = 2; i < name.Length; ++i)
- if (!char.IsDigit(name[i])) return false;
- Error(absy, "type name: {0} is registered for bitvectors", name);
- return true;
- }
+ public class ResolutionContext : CheckingContext {
+ public ResolutionContext(IErrorSink errorSink)
+ : base(errorSink) {//BASEMOVEA
+ //:base(errorSink);
+ }
+
+ // ------------------------------ Boogie 2 Types -------------------------
+
+ // user-defined types, which can be either TypeCtorDecl or TypeSynonymDecl
+ Hashtable /*string->NamedDeclaration*//*!*/ types = new Hashtable /*string->NamedDeclaration*/ ();
+ [ContractInvariantMethod]
+ void ObjectInvariant() {
+ Contract.Invariant(types != null);
+ Contract.Invariant(cce.NonNullElements(typeBinders));
+ Contract.Invariant(varContext != null);
+ Contract.Invariant(funcdures != null);
+ }
+
+
+ /// <summary>
+ /// Checks if name coincides with the name of a bitvector type. If so, reports an error and
+ /// returns true; otherwise, returns false.
+ /// </summary>
+ private bool CheckBvNameClashes(Absy absy, string name) {
+ Contract.Requires(name != null);
+ Contract.Requires(absy != null);
+ if (name.StartsWith("bv") && name.Length > 2) {
+ for (int i = 2; i < name.Length; ++i)
+ if (!char.IsDigit(name[i]))
return false;
- }
+ Error(absy, "type name: {0} is registered for bitvectors", name);
+ return true;
+ }
+ return false;
+ }
- public void AddType(NamedDeclaration! td)
- {
- assert (td is TypeCtorDecl) || (td is TypeSynonymDecl);
-
- string! name = (!)td.Name;
- if (CheckBvNameClashes(td, name))
- return; // error has already been reported
-
- if (types[name] != null)
- {
- Error(td, "more than one declaration of type name: {0}", name);
- }
- else
- {
- types.Add(name, td);
- }
- }
+ public void AddType(NamedDeclaration td) {
+ Contract.Requires(td != null);
+ Contract.Assert((td is TypeCtorDecl) || (td is TypeSynonymDecl));
- /// <summary>
- /// Returns the declaration of the named type, or null if
- /// no such type is declared. Also return null if the type
- /// declared with the given name is not a constructor but a
- /// type synonym
- /// </summary>
- /// <param name="name"></param>
- /// <returns></returns>
- public TypeCtorDecl LookUpType(string! name)
- {
- return types[name] as TypeCtorDecl;
- }
-
- public TypeSynonymDecl LookUpTypeSynonym(string! name)
- {
- return types[name] as TypeSynonymDecl;
- }
-
- // ------------------------------ Boogie 2 Type Binders ------------------------------
+ string name = cce.NonNull(td.Name);
+ if (CheckBvNameClashes(td, name))
+ return; // error has already been reported
- List<TypeVariable!>! typeBinders = new List<TypeVariable!>(5);
-
- public void AddTypeBinder(TypeVariable! td) {
- if (CheckBvNameClashes(td, td.Name)) {
- return;
- }
- if (types.ContainsKey(td.Name)) {
- Error(td, "name is already reserved for type constructor: {0}", td.Name);
- return;
- }
- for (int i = 0; i < typeBinders.Count; i++) {
- if (typeBinders[i].Name == td.Name) {
- Error(td, "more than one declaration of type variable: {0}", td.Name);
- return;
- }
- }
- typeBinders.Add(td);
- }
-
- public int TypeBinderState {
- get { return typeBinders.Count; }
- set { typeBinders.RemoveRange(value, typeBinders.Count - value); }
- }
-
- /// <summary>
- /// Returns the declaration of the named type binder, or null if
- /// no such binder is declared.
- /// </summary>
- public TypeVariable LookUpTypeBinder(string! name)
- {
- for (int i = typeBinders.Count; 0 <= --i; ) {
- TypeVariable! td = typeBinders[i];
- if (td.Name == name) {
- return td;
- }
- }
- return null; // not present
- }
-
- // ------------------------------ Types ------------------------------
+ if (types[name] != null) {
+ Error(td, "more than one declaration of type name: {0}", name);
+ } else {
+ types.Add(name, td);
+ }
+ }
- // user-defined types
- // Hashtable /*string->TypeDecl*/! types = new Hashtable /*string->TypeDecl*/ ();
-/*
- public void AddType(TypeDecl! td)
- {
- string! name = (!)td.Name;
-
- if (name.StartsWith("bv") && name.Length > 2) {
- bool isBv = true;
- for (int i = 2; i < name.Length; ++i)
- if (!char.IsDigit(name[i])) isBv = false;
- if (isBv)
- Error(td, "type name: {0} is registered for bitvectors", name);
- }
+ /// <summary>
+ /// Returns the declaration of the named type, or null if
+ /// no such type is declared. Also return null if the type
+ /// declared with the given name is not a constructor but a
+ /// type synonym
+ /// </summary>
+ /// <param name="name"></param>
+ /// <returns></returns>
+ public TypeCtorDecl LookUpType(string name) {
+ Contract.Requires(name != null);
+ return types[name] as TypeCtorDecl;
+ }
+
+ public TypeSynonymDecl LookUpTypeSynonym(string name) {
+ Contract.Requires(name != null);
+ return types[name] as TypeSynonymDecl;
+ }
+
+ // ------------------------------ Boogie 2 Type Binders ------------------------------
+
+ List<TypeVariable/*!*/>/*!*/ typeBinders = new List<TypeVariable/*!*/>(5);
+
+ public void AddTypeBinder(TypeVariable td) {
+ Contract.Requires(td != null);
+ if (CheckBvNameClashes(td, td.Name)) {
+ return;
+ }
+ if (types.ContainsKey(td.Name)) {
+ Error(td, "name is already reserved for type constructor: {0}", td.Name);
+ return;
+ }
+ for (int i = 0; i < typeBinders.Count; i++) {
+ if (typeBinders[i].Name == td.Name) {
+ Error(td, "more than one declaration of type variable: {0}", td.Name);
+ return;
+ }
+ }
+ typeBinders.Add(td);
+ }
+
+ public int TypeBinderState {
+ get {
+ return typeBinders.Count;
+ }
+ set {
+ typeBinders.RemoveRange(value, typeBinders.Count - value);
+ }
+ }
+
+ /// <summary>
+ /// Returns the declaration of the named type binder, or null if
+ /// no such binder is declared.
+ /// </summary>
+ public TypeVariable LookUpTypeBinder(string name) {
+ Contract.Requires(name != null);
+ for (int i = typeBinders.Count; 0 <= --i; ) {
+ TypeVariable/*!*/ td = typeBinders[i];
+ Contract.Assert(td != null);
+ if (td.Name == name) {
+ return td;
+ }
+ }
+ return null; // not present
+ }
+
+ // ------------------------------ Types ------------------------------
+
+ // user-defined types
+ // Hashtable /*string->TypeDecl*/! types = new Hashtable /*string->TypeDecl*/ ();
+ /*
+ public void AddType(TypeDecl td){
+ Contract.Requires(td != null);
+ string! name = (!)td.Name;
+
+ if (name.StartsWith("bv") && name.Length > 2) {
+ bool isBv = true;
+ for (int i = 2; i < name.Length; ++i)
+ if (!char.IsDigit(name[i])) isBv = false;
+ if (isBv)
+ Error(td, "type name: {0} is registered for bitvectors", name);
+ }
- if (types[name] != null)
- {
- Error(td, "more than one declaration of type name: {0}", name);
- }
- else
- {
- types.Add(name, td);
+ if (types[name] != null)
+ {
+ Error(td, "more than one declaration of type name: {0}", name);
+ }
+ else
+ {
+ types.Add(name, td);
+ }
}
- }
-*/
- /// <summary>
- /// Returns the declaration of the named type, or null if
- /// no such type is declared.
- /// </summary>
- /// <param name="name"></param>
- /// <returns></returns>
- /* public TypeDecl LookUpType(string! name)
- {
+ */
+ /// <summary>
+ /// Returns the declaration of the named type, or null if
+ /// no such type is declared.
+ /// </summary>
+ /// <param name="name"></param>
+ /// <returns></returns>
+ /* public TypeDecl LookUpType(string name){
+Contract.Requires(name != null);
return (TypeDecl)types[name];
}
- */
- // ------------------------------ Type Binders ------------------------------
-/*
- List<TypeBinderDecl!>! typeBinders = new List<TypeBinderDecl!>(5);
+ */
+ // ------------------------------ Type Binders ------------------------------
+ /*
+ List<TypeBinderDecl!>! typeBinders = new List<TypeBinderDecl!>(5);
- public void AddTypeBinder(TypeBinderDecl! td) {
- for (int i = 0; i < typeBinders.Count; i++) {
- if (typeBinders[i].Name == td.Name) {
- Error(td, "more than one declaration of type binder name: {0}", td.Name);
- return;
+ public void AddTypeBinder(TypeBinderDecl td){
+ Contract.Requires(td != null);
+ for (int i = 0; i < typeBinders.Count; i++) {
+ if (typeBinders[i].Name == td.Name) {
+ Error(td, "more than one declaration of type binder name: {0}", td.Name);
+ return;
+ }
+ }
+ typeBinders.Add(td);
}
- }
- typeBinders.Add(td);
- }
- public int TypeBinderState {
- get { return typeBinders.Count; }
- set { typeBinders.RemoveRange(value, typeBinders.Count - value); }
- }
+ public int TypeBinderState {
+ get { return typeBinders.Count; }
+ set { typeBinders.RemoveRange(value, typeBinders.Count - value); }
+ }
- /// <summary>
- /// Returns the declaration of the named type binder, or null if
- /// no such binder is declared.
- /// </summary>
- public TypeDecl LookUpTypeBinder(string! name)
- {
- for (int i = typeBinders.Count; 0 <= --i; ) {
- TypeBinderDecl td = typeBinders[i];
- if (td.Name == name) {
- return td;
+ /// <summary>
+ /// Returns the declaration of the named type binder, or null if
+ /// no such binder is declared.
+ /// </summary>
+ public TypeDecl LookUpTypeBinder(string name){
+ Contract.Requires(name != null);
+ for (int i = typeBinders.Count; 0 <= --i; ) {
+ TypeBinderDecl td = typeBinders[i];
+ if (td.Name == name) {
+ return td;
+ }
+ }
+ return null; // not present
}
- }
- return null; // not present
- }
- */
- // ------------------------------ Variables ------------------------------
+ */
+ // ------------------------------ Variables ------------------------------
+
+ class VarContextNode {
+ [ContractInvariantMethod]
+ void ObjectInvariant() {
+ Contract.Invariant(VarSymbols != null);
+ }
+
+ public readonly Hashtable /*string->Variable*//*!*/ VarSymbols = new Hashtable /*string->Variable*/();
+ public /*maybe null*/ VarContextNode ParentContext;
+ public readonly bool Opaque;
+
+ public VarContextNode(/*maybe null*/ VarContextNode parentContext, bool opaque) {
+ ParentContext = parentContext;
+ Opaque = opaque;
+ }
+ }
- class VarContextNode
- {
- public readonly Hashtable /*string->Variable*/! VarSymbols = new Hashtable /*string->Variable*/();
- public /*maybe null*/ VarContextNode ParentContext;
- public readonly bool Opaque;
-
- public VarContextNode(/*maybe null*/ VarContextNode parentContext, bool opaque)
- {
- ParentContext = parentContext;
- Opaque = opaque;
- }
- }
+ // symbolic constants, global variables, local variables, formals, expression-bound variables
+ VarContextNode/*!*/ varContext = new VarContextNode(null, false);
- // symbolic constants, global variables, local variables, formals, expression-bound variables
- VarContextNode! varContext = new VarContextNode(null, false);
+ /// <summary>
+ /// Adds a variable context.
+ /// </summary>
+ public void PushVarContext() {
+ varContext = new VarContextNode(varContext, false);
+ }
- /// <summary>
- /// Adds a variable context.
- /// </summary>
- public void PushVarContext()
- {
- varContext = new VarContextNode(varContext, false);
- }
+ /// <summary>
+ /// Adds an opaque variable context, that is, one that blocks all previously pushed contexts.
+ /// </summary>
+ public void PushOpaqueVarContext() {
+ varContext = new VarContextNode(varContext, true);
+ }
- /// <summary>
- /// Adds an opaque variable context, that is, one that blocks all previously pushed contexts.
- /// </summary>
- public void PushOpaqueVarContext()
- {
- varContext = new VarContextNode(varContext, true);
- }
-
- /// <summary>
- /// Requires there to be more than one variable context.
- /// </summary>
- public void PopVarContext()
- {
- assert varContext.ParentContext != null;
- varContext = varContext.ParentContext;
+ /// <summary>
+ /// Requires there to be more than one variable context.
+ /// </summary>
+ public void PopVarContext() {
+ Contract.Assert(varContext.ParentContext != null);
+ varContext = varContext.ParentContext;
+ }
+
+ public void AddVariable(Variable var, bool global) {
+ Contract.Requires(var != null);
+ if (FindVariable(cce.NonNull(var.Name), !global) != null) {
+ Error(var, "more than one declaration of variable name: {0}", var.Name);
+ } else {
+ varContext.VarSymbols.Add(var.Name, var);
+ }
+ }
+
+ /// <summary>
+ /// Returns the declaration of the named variable, or null if
+ /// no such variable is declared.
+ /// </summary>
+ /// <param name="name"></param>
+ /// <returns></returns>
+ public Variable LookUpVariable(string name) {
+ Contract.Requires(name != null);
+ return FindVariable(name, false);
+ }
+
+ Variable FindVariable(string name, bool ignoreTopLevelVars) {
+ Contract.Requires(name != null);
+ VarContextNode c = varContext;
+ bool lookOnlyForConstants = false;
+ do {
+ if (ignoreTopLevelVars && c.ParentContext == null) {
+ // this is the top level and we're asked to ignore the top level; hence, we're done
+ break;
}
- public void AddVariable(Variable! var, bool global)
- {
- if (FindVariable((!)var.Name, !global) != null)
- {
- Error(var, "more than one declaration of variable name: {0}", var.Name);
- }
- else
- {
- varContext.VarSymbols.Add(var.Name, var);
- }
+ Variable var = (Variable)c.VarSymbols[name];
+ if (var != null && (!lookOnlyForConstants || var is Constant)) {
+ return var;
}
+ // not at this level
- /// <summary>
- /// Returns the declaration of the named variable, or null if
- /// no such variable is declared.
- /// </summary>
- /// <param name="name"></param>
- /// <returns></returns>
- public Variable LookUpVariable(string! name)
- {
- return FindVariable(name, false);
+ if (c.Opaque) {
+ // from here on, only constants can be looked up
+ lookOnlyForConstants = true;
}
+ c = c.ParentContext;
+ } while (c != null);
- Variable FindVariable(string! name, bool ignoreTopLevelVars)
- {
- VarContextNode c = varContext;
- bool lookOnlyForConstants = false;
- do {
- if (ignoreTopLevelVars && c.ParentContext == null) {
- // this is the top level and we're asked to ignore the top level; hence, we're done
- break;
- }
+ // not present in the relevant levels
+ return null;
+ }
- Variable var = (Variable)c.VarSymbols[name];
- if (var != null && (!lookOnlyForConstants || var is Constant)) {
- return var;
- }
- // not at this level
-
- if (c.Opaque) {
- // from here on, only constants can be looked up
- lookOnlyForConstants = true;
- }
- c = c.ParentContext;
- } while (c != null);
-
- // not present in the relevant levels
- return null;
- }
+ // ------------------------------ Functions/Procedures ------------------------------
- // ------------------------------ Functions/Procedures ------------------------------
+ // uninterpreted function symbols, procedures
+ Hashtable /*string->DeclWithFormals*//*!*/ funcdures = new Hashtable /*string->DeclWithFormals*/ ();
- // uninterpreted function symbols, procedures
- Hashtable /*string->DeclWithFormals*/! funcdures = new Hashtable /*string->DeclWithFormals*/ ();
+ public void AddProcedure(DeclWithFormals proc) {
+ Contract.Requires(proc != null);
+ if (funcdures[cce.NonNull(proc.Name)] != null) {
+ Error(proc, "more than one declaration of function/procedure name: {0}", proc.Name);
+ } else {
+ funcdures.Add(proc.Name, proc);
+ }
+ }
- public void AddProcedure(DeclWithFormals! proc)
- {
- if (funcdures[(!)proc.Name] != null)
- {
- Error(proc, "more than one declaration of function/procedure name: {0}", proc.Name);
- }
- else
- {
- funcdures.Add(proc.Name, proc);
- }
- }
+ /// <summary>
+ /// Returns the declaration of the named function/procedure, or null if
+ /// no such function or procedure is declared.
+ /// </summary>
+ /// <param name="name"></param>
+ /// <returns></returns>
+ public DeclWithFormals LookUpProcedure(string name) {
+ Contract.Requires(name != null);
+ return (DeclWithFormals)funcdures[name];
+ }
- /// <summary>
- /// Returns the declaration of the named function/procedure, or null if
- /// no such function or procedure is declared.
- /// </summary>
- /// <param name="name"></param>
- /// <returns></returns>
- public DeclWithFormals LookUpProcedure(string! name)
- {
- return (DeclWithFormals)funcdures[name];
- }
+ // ------------------------------ Blocks ------------------------------
- // ------------------------------ Blocks ------------------------------
+ class ProcedureContext {
+ [ContractInvariantMethod]
+ void ObjectInvariant() {
+ Contract.Invariant(Blocks != null);
+ }
- class ProcedureContext {
- public readonly Hashtable! /*string->Block!*/ Blocks;
- public readonly ProcedureContext Next;
- public ProcedureContext(ProcedureContext next) {
- Blocks = new Hashtable /*string->Block!*/ ();
- Next = next;
- }
- }
- /*maybe null*/ ProcedureContext procedureContext; // stack of procedure contexts
- public bool HasProcedureContext {
- get { return procedureContext != null; }
- }
+ public readonly Hashtable/*!*/ /*string->Block!*/ Blocks;
+ public readonly ProcedureContext Next;
+ public ProcedureContext(ProcedureContext next) {
+ Blocks = new Hashtable /*string->Block!*/ ();
+ Next = next;
+ }
+ }
+ /*maybe null*/
+ ProcedureContext procedureContext; // stack of procedure contexts
+ public bool HasProcedureContext {
+ get {
+ return procedureContext != null;
+ }
+ }
- /// <summary>
- /// Pushes a new procedure context.
- /// </summary>
- public void PushProcedureContext()
- ensures HasProcedureContext;
- {
- procedureContext = new ProcedureContext(procedureContext);
- }
+ /// <summary>
+ /// Pushes a new procedure context.
+ /// </summary>
+ public void PushProcedureContext() {
+ Contract.Ensures(HasProcedureContext);
+ procedureContext = new ProcedureContext(procedureContext);
+ }
- /// <summary>
- /// Requires there to be a procedure context. Pops it.
- /// </summary>
- public void PopProcedureContext()
- requires HasProcedureContext;
- {
- assert procedureContext != null; // follows from precondition
- procedureContext = procedureContext.Next;
- }
+ /// <summary>
+ /// Requires there to be a procedure context. Pops it.
+ /// </summary>
+ public void PopProcedureContext() {
+ Contract.Requires(HasProcedureContext);
+ Contract.Assert(procedureContext != null); // follows from precondition
+ procedureContext = procedureContext.Next;
+ }
- /// <summary>
- /// Requires there to be a procedure context.
- /// </summary>
- /// <param name="block"></param>
- public void AddBlock(Block! block)
- requires HasProcedureContext;
- {
- assert procedureContext != null; // follows from precondition
- Hashtable! /*string->Block!*/ blocks = procedureContext.Blocks;
- if (blocks[block.Label] != null)
- {
- Error(block, "more than one declaration of block name: {0}", block.Label);
- }
- else
- {
- blocks.Add(block.Label, block);
- }
- }
+ /// <summary>
+ /// Requires there to be a procedure context.
+ /// </summary>
+ /// <param name="block"></param>
+ public void AddBlock(Block block) {
+ Contract.Requires(block != null);
+ Contract.Requires(HasProcedureContext);
+ Contract.Assert(procedureContext != null); // follows from precondition
+ Hashtable/*!*/ /*string->Block!*/ blocks = procedureContext.Blocks;
+ Contract.Assert(blocks != null);
+ if (blocks[block.Label] != null) {
+ Error(block, "more than one declaration of block name: {0}", block.Label);
+ } else {
+ blocks.Add(block.Label, block);
+ }
+ }
- /// <summary>
- /// Requires there to be a procedure context.
- /// Returns the declaration of the named block, or null if
- /// no such block is declared.
- /// </summary>
- /// <param name="name"></param>
- /// <returns></returns>
- public Block LookUpBlock(string! name)
- requires HasProcedureContext;
- {
- assert procedureContext != null; // follows from precondition
- Hashtable! /*string->Block!*/ blocks = procedureContext.Blocks;
- return (Block)blocks[name];
- }
+ /// <summary>
+ /// Requires there to be a procedure context.
+ /// Returns the declaration of the named block, or null if
+ /// no such block is declared.
+ /// </summary>
+ /// <param name="name"></param>
+ /// <returns></returns>
+ public Block LookUpBlock(string name) {
+ Contract.Requires(name != null);
+ Contract.Requires(HasProcedureContext);
+ Contract.Assert(procedureContext != null); // follows from precondition
+ Hashtable/*!*/ /*string->Block!*/ blocks = procedureContext.Blocks;
+ Contract.Assert(blocks != null);
+ return (Block)blocks[name];
+ }
- // ------------------------------ Flags ------------------------------
+ // ------------------------------ Flags ------------------------------
- public enum State { StateLess, Single, Two }
- State stateMode = State.Single;
+ public enum State {
+ StateLess,
+ Single,
+ Two
+ }
+ State stateMode = State.Single;
+
+ /// <summary>
+ /// To increase our confidence in that the caller knows what it's doing, we only allow
+ /// the state mode to be changed in and out of the State.Single mode.
+ /// </summary>
+ public State StateMode {
+ get {
+ return stateMode;
+ }
+ set {
+ Contract.Assert(value != stateMode);
+ Contract.Assert(stateMode == State.Single || value == State.Single);
+ cce.BeginExpose(this);
+ {
+ stateMode = value;
+ }
+ cce.EndExpose();
+ }
+ }
- /// <summary>
- /// To increase our confidence in that the caller knows what it's doing, we only allow
- /// the state mode to be changed in and out of the State.Single mode.
- /// </summary>
- public State StateMode {
- get {
- return stateMode;
- }
- set {
- assert value != stateMode;
- assert stateMode == State.Single || value == State.Single;
- expose (this) {
- stateMode = value;
- }
- }
- }
-
- bool triggerMode = false;
-
- /// <summary>
- /// Setting TriggerMode is allowed only if the setting has the effect of toggling the
- /// boolean. That is, TriggerMode can be set to true only if it previously was false,
- /// and TriggerMode can be set to false only if it previously was true.
- /// </summary>
- public bool TriggerMode
- {
- get
- {
- return triggerMode;
- }
- set
- {
- assert triggerMode != value;
- expose (this) {
- triggerMode = value;
- }
- }
- }
+ bool triggerMode = false;
+
+ /// <summary>
+ /// Setting TriggerMode is allowed only if the setting has the effect of toggling the
+ /// boolean. That is, TriggerMode can be set to true only if it previously was false,
+ /// and TriggerMode can be set to false only if it previously was true.
+ /// </summary>
+ public bool TriggerMode {
+ get {
+ return triggerMode;
+ }
+ set {
+ Contract.Assert(triggerMode != value);
+ cce.BeginExpose(this);
+ {
+ triggerMode = value;
+ }
+ cce.EndExpose();
+ }
}
+ }
- public class TypecheckingContext : CheckingContext
- {
- public IdentifierExprSeq Frame; // used in checking the assignment targets of implementation bodies
+ public class TypecheckingContext : CheckingContext {
+ public IdentifierExprSeq Frame; // used in checking the assignment targets of implementation bodies
- public TypecheckingContext(IErrorSink errorSink)
- {
- base(errorSink);
- }
-
- public bool InFrame(Variable! v)
- requires Frame != null;
- {
- return exists{IdentifierExpr! ie in Frame; ie.Decl == v};
- }
+ public TypecheckingContext(IErrorSink errorSink)
+ : base(errorSink) {//BASEMOVEA
+ //:base(errorSink);
+ }
+
+ public bool InFrame(Variable v) {
+ Contract.Requires(v != null);
+ Contract.Requires(Frame != null);
+ return Contract.Exists(0, Frame.Length, ie => Frame[ie].Decl == v);
}
+ }
}
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