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diff --git a/include/expr/Parser.h b/include/expr/Parser.h
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+++ b/include/expr/Parser.h
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+//===-- Parser.h ------------------------------------------------*- C++ -*-===//
+//
+//                     The KLEE Symbolic Virtual Machine
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef KLEE_EXPR_PARSER_H
+#define KLEE_EXPR_PARSER_H
+
+#include "klee/Expr.h"
+
+#include <vector>
+#include <string>
+
+namespace llvm {
+  class MemoryBuffer;
+}
+
+namespace klee {
+namespace expr {
+  // These are the language types we manipulate.
+  typedef ref<Expr> ExprHandle;
+  typedef UpdateList VersionHandle;
+  
+  /// Identifier - Wrapper for a uniqued string.
+  struct Identifier {
+    const std::string Name;
+
+  public:
+    Identifier(const std::string _Name) : Name(_Name) {}
+  };
+
+  // FIXME: Do we have a use for tracking source locations?
+
+  /// Decl - Base class for top level declarations.
+  class Decl {
+  public:
+    Decl();
+    virtual ~Decl() {}
+
+    /// dump - Dump the AST node to stderr.
+    virtual void dump() = 0;
+  };
+
+  /// ArrayDecl - Array declarations.
+  ///
+  /// For example:
+  ///   array obj : 32 -> 8 = symbolic
+  ///   array obj[32] : 32 -> 8 = { ... }
+  class ArrayDecl : public Decl {
+  public:
+    /// Name - The name of this array.
+    const Identifier *Name;
+
+    /// Size - The maximum array size (or 0 if unspecified). Concrete
+    /// arrays always are specified with a size.
+    const unsigned Size;
+
+    /// Domain - The width of indices.
+    const unsigned Domain;
+
+    /// Range - The width of array contents.
+    const unsigned Range;
+    
+    /// Contents - The initial contents of the array. The array is
+    /// symbolic if no contents are specified. The contained
+    /// expressions are guaranteed to be constants.
+    const std::vector<ExprHandle> Contents;
+
+  public:
+    template<typename InputIterator>
+    ArrayDecl(const Identifier *_Name, unsigned _Size, 
+              unsigned _Domain, unsigned _Range,
+              InputIterator ContentsBegin=InputIterator(), 
+              InputIterator ContentsEnd=InputIterator()) 
+      : Name(_Name), Size(_Size), Domain(_Domain), Range(_Range),
+        Contents(ContentsBegin, ContentsEnd) {}
+  };
+
+  /// VarDecl - Variable declarations, used to associate names to
+  /// expressions or array versions outside of expressions.
+  /// 
+  /// For example:
+  // FIXME: What syntax are we going to use for this? We need it.
+  class VarDecl : public Decl {
+  public:
+    const Identifier *Name;    
+  };
+
+  /// ExprVarDecl - Expression variable declarations.
+  class ExprVarDecl : public VarDecl {
+  public:
+    ExprHandle Value;
+  };
+
+  /// VersionVarDecl - Array version variable declarations.
+  class VersionVarDecl : public VarDecl {
+  public:
+    VersionHandle Value;
+  };
+
+  /// CommandDecl - Base class for language commands.
+  class CommandDecl : public Decl {
+  public:
+    const Identifier *Name;
+  };
+
+  /// QueryCommand - Query commands.
+  ///
+  /// (query [ ... constraints ... ] expression)
+  /// (query [ ... constraints ... ] expression values)
+  /// (query [ ... constraints ... ] expression values objects)
+  class QueryCommand : public CommandDecl {
+  public:
+    // FIXME: One issue with STP... should we require the FE to
+    // guarantee that these are consistent? That is a cornerstone of
+    // being able to do independence. We may want this as a flag, if
+    // we are to interface with things like SMT.
+
+    /// Constraints - The list of constraints to assume for this
+    /// expression.
+    const std::vector<ExprHandle> Constraints;
+    
+    /// Query - The expression being queried.
+    ExprHandle Query;
+
+    /// Values - The expressions for which counterexamples should be
+    /// given if the query is invalid.
+    const std::vector<ExprHandle> Values;
+
+    /// Objects - Symbolic arrays whose initial contents should be
+    /// given if the query is invalid.
+    const std::vector<ArrayDecl> Objects;
+
+  public:
+    template<typename InputIterator>
+    QueryCommand(InputIterator ConstraintsBegin, 
+                 InputIterator ConstraintsEnd,
+                 ExprHandle _Query)
+      : Constraints(ConstraintsBegin, ConstraintsEnd),
+        Query(_Query) {}
+
+    virtual void dump();
+  };
+  
+  /// Parser - Public interface for parsing a .pc language file.
+  class Parser {
+  protected:
+    Parser();
+  public:
+    virtual ~Parser();
+
+    /// SetMaxErrors - Suppress anything beyond the first N errors.
+    virtual void SetMaxErrors(unsigned N) = 0;
+    
+    /// GetNumErrors - Return the number of encountered errors.
+    virtual unsigned GetNumErrors() const = 0;
+
+    /// ParseTopLevelDecl - Parse and return a top level declaration,
+    /// which the caller assumes ownership of.
+    ///
+    /// \return NULL indicates the end of the file has been reached.
+    virtual Decl *ParseTopLevelDecl() = 0;
+
+    /// CreateParser - Create a parser implementation for the given
+    /// MemoryBuffer.
+    ///
+    /// \arg Name - The name to use in diagnostic messages.
+    static Parser *Create(const std::string Name,
+                          const llvm::MemoryBuffer *MB);
+  };
+}
+}
+
+#endif