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diff --git a/session.h b/session.h
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+++ b/session.h
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+// -*- C++ -*-
+// Copyright (C) 2005 Red Hat Inc.
+//
+// This file is part of systemtap, and is free software.  You can
+// redistribute it and/or modify it under the terms of the GNU General
+// Public License (GPL); either version 2, or (at your option) any
+// later version.
+
+#ifndef SESSION_H
+#define SESSION_H
+
+#include <string>
+#include <vector>
+#include <iostream>
+#include <sstream>
+#include <map>
+
+
+// forward decls for all referenced systemtap types
+struct match_node;
+struct stapfile;
+struct vardecl;
+struct functiondecl;
+struct derived_probe;
+struct embeddedcode;
+struct translator_output;
+struct unparser;
+struct semantic_error;
+
+
+// XXX: a generalized form of this descriptor could be associated with
+// a vardecl instead of out here at the systemtap_session level.
+struct statistic_decl
+{
+  statistic_decl()
+    : type(none), 
+      logarithmic_buckets(0),
+      linear_low(0), linear_high(0), linear_step(0)
+  {}    
+  enum { none, linear, logarithmic } type;
+  int64_t logarithmic_buckets;
+  int64_t linear_low;
+  int64_t linear_high;
+  int64_t linear_step;
+};
+
+
+struct systemtap_session
+{
+  systemtap_session ();
+
+  // command line args
+  std::vector<std::string> include_path;
+  std::vector<std::string> macros;
+  std::vector<std::string> args;
+  std::string kernel_release;
+  std::string runtime_path;
+  std::string module_name;
+  std::string output_file;
+  std::string cmd;
+  int target_pid;
+  int last_pass;
+  bool test_mode;
+  bool verbose;
+  bool keep_tmpdir;
+  bool guru_mode;
+  bool bulk_mode;
+  int buffer_size;
+
+  // temporary directory for module builds etc.
+  // hazardous - it is "rm -rf"'d at exit
+  std::string tmpdir;
+  std::string translated_source; // C source code
+
+  match_node* pattern_root;
+  void register_library_aliases();
+
+  // parse trees for the various script files
+  stapfile* user_file;
+  std::vector<stapfile*> library_files;
+
+  // resolved globals/functions/probes for the run as a whole
+  std::vector<stapfile*> files;
+  std::vector<vardecl*> globals;
+  std::vector<functiondecl*> functions;
+  std::vector<derived_probe*> probes;
+  std::vector<embeddedcode*> embeds;
+  std::map<std::string, statistic_decl> stat_decls;
+  // XXX: vector<*> instead please?
+
+  // module-referencing file handles
+  std::map<std::string,int> module_fds;
+
+  // unparser data
+  translator_output* op;
+  unparser* up;
+
+  unsigned num_errors;
+  // void print_error (const parse_error& e);
+  void print_error (const semantic_error& e);
+};
+
+
+#endif // SESSION_H