/
eval.cs
1239 lines (1049 loc) · 34 KB
/
eval.cs
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//
// eval.cs: Evaluation and Hosting API for the C# compiler
//
// Authors:
// Miguel de Icaza (miguel@gnome.org)
//
// Dual licensed under the terms of the MIT X11 or GNU GPL
//
// Copyright 2001, 2002, 2003 Ximian, Inc (http://www.ximian.com)
// Copyright 2004, 2005, 2006, 2007, 2008 Novell, Inc
//
using System;
using System.Threading;
using System.Collections.Generic;
using System.Reflection;
using System.Reflection.Emit;
using System.IO;
using System.Globalization;
using System.Text;
namespace Mono.CSharp {
/// <summary>
/// Evaluator: provides an API to evaluate C# statements and
/// expressions dynamically.
/// </summary>
/// <remarks>
/// This class exposes static methods to evaluate expressions in the
/// current program.
///
/// To initialize the evaluator with a number of compiler
/// options call the Init(string[]args) method with a set of
/// command line options that the compiler recognizes.
///
/// To interrupt execution of a statement, you can invoke the
/// Evaluator.Interrupt method.
/// </remarks>
public class Evaluator {
enum ParseMode {
// Parse silently, do not output any error messages
Silent,
// Report errors during parse
ReportErrors,
// Auto-complete, means that the tokenizer will start producing
// GETCOMPLETIONS tokens when it reaches a certain point.
GetCompletions
}
static object evaluator_lock = new object ();
static string current_debug_name;
static int count;
static Thread invoke_thread;
static List<NamespaceEntry.UsingAliasEntry> using_alias_list = new List<NamespaceEntry.UsingAliasEntry> ();
internal static List<NamespaceEntry.UsingEntry> using_list = new List<NamespaceEntry.UsingEntry> ();
static Dictionary<string, Tuple<FieldSpec, FieldInfo>> fields = new Dictionary<string, Tuple<FieldSpec, FieldInfo>> ();
static TypeSpec interactive_base_class;
static Driver driver;
static bool inited;
static CompilerContext ctx;
public static TextWriter MessageOutput = Console.Out;
/// <summary>
/// Optional initialization for the Evaluator.
/// </summary>
/// <remarks>
/// Initializes the Evaluator with the command line options
/// that would be processed by the command line compiler. Only
/// the first call to Init will work, any future invocations are
/// ignored.
///
/// You can safely avoid calling this method if your application
/// does not need any of the features exposed by the command line
/// interface.
/// </remarks>
public static void Init (string [] args)
{
InitAndGetStartupFiles (args);
}
internal static ReportPrinter SetPrinter (ReportPrinter report_printer)
{
return ctx.Report.SetPrinter (report_printer);
}
/// <summary>
/// Optional initialization for the Evaluator.
/// </summary>
/// <remarks>
/// Initializes the Evaluator with the command line
/// options that would be processed by the command
/// line compiler. Only the first call to
/// InitAndGetStartupFiles or Init will work, any future
/// invocations are ignored.
///
/// You can safely avoid calling this method if your application
/// does not need any of the features exposed by the command line
/// interface.
///
/// This method return an array of strings that contains any
/// files that were specified in `args'.
/// </remarks>
public static string [] InitAndGetStartupFiles (string [] args)
{
lock (evaluator_lock){
if (inited)
return new string [0];
var crp = new ConsoleReportPrinter ();
driver = Driver.Create (args, false, crp);
if (driver == null)
throw new Exception ("Failed to create compiler driver with the given arguments");
crp.Fatal = driver.fatal_errors;
ctx = driver.ctx;
RootContext.ToplevelTypes = new ModuleCompiled (ctx, true);
driver.ProcessDefaultConfig ();
var startup_files = new List<string> ();
foreach (CompilationUnit file in Location.SourceFiles)
startup_files.Add (file.Path);
CompilerCallableEntryPoint.Reset ();
RootContext.ToplevelTypes = new ModuleCompiled (ctx, true);
var ctypes = TypeManager.InitCoreTypes ();
ctx.MetaImporter.Initialize ();
driver.LoadReferences ();
TypeManager.InitCoreTypes (ctx, ctypes);
TypeManager.InitOptionalCoreTypes (ctx);
RootContext.EvalMode = true;
inited = true;
return startup_files.ToArray ();
}
}
static void Init ()
{
Init (new string [0]);
}
static void Reset ()
{
CompilerCallableEntryPoint.PartialReset ();
RootContext.PartialReset ();
RootContext.ToplevelTypes = new ModuleCompiled (ctx, true);
Location.AddFile (null, "{interactive}");
Location.Initialize ();
current_debug_name = "interactive" + (count++) + ".dll";
if (Environment.GetEnvironmentVariable ("SAVE") != null){
CodeGen.Init (current_debug_name, current_debug_name, false, ctx);
} else
CodeGen.InitDynamic (ctx, current_debug_name);
}
/// <summary>
/// The base class for the classes that host the user generated code
/// </summary>
/// <remarks>
///
/// This is the base class that will host the code
/// executed by the Evaluator. By default
/// this is the Mono.CSharp.InteractiveBase class
/// which is useful for interactive use.
///
/// By changing this property you can control the
/// base class and the static members that are
/// available to your evaluated code.
/// </remarks>
static public TypeSpec InteractiveBaseClass {
get {
if (interactive_base_class != null)
return interactive_base_class;
return ctx.MetaImporter.ImportType (typeof (InteractiveBase));
}
}
public static void SetInteractiveBaseClass (Type type)
{
if (type == null)
throw new ArgumentNullException ();
lock (evaluator_lock)
interactive_base_class = ctx.MetaImporter.ImportType (type);
}
/// <summary>
/// Interrupts the evaluation of an expression executing in Evaluate.
/// </summary>
/// <remarks>
/// Use this method to interrupt long-running invocations.
/// </remarks>
public static void Interrupt ()
{
if (!inited || !invoking)
return;
if (invoke_thread != null)
invoke_thread.Abort ();
}
/// <summary>
/// Compiles the input string and returns a delegate that represents the compiled code.
/// </summary>
/// <remarks>
///
/// Compiles the input string as a C# expression or
/// statement, unlike the Evaluate method, the
/// resulting delegate can be invoked multiple times
/// without incurring in the compilation overhead.
///
/// If the return value of this function is null,
/// this indicates that the parsing was complete.
/// If the return value is a string it indicates
/// that the input string was partial and that the
/// invoking code should provide more code before
/// the code can be successfully compiled.
///
/// If you know that you will always get full expressions or
/// statements and do not care about partial input, you can use
/// the other Compile overload.
///
/// On success, in addition to returning null, the
/// compiled parameter will be set to the delegate
/// that can be invoked to execute the code.
///
/// </remarks>
static public string Compile (string input, out CompiledMethod compiled)
{
if (input == null || input.Length == 0){
compiled = null;
return null;
}
lock (evaluator_lock){
if (!inited)
Init ();
else
ctx.Report.Printer.Reset ();
bool partial_input;
CSharpParser parser = ParseString (ParseMode.Silent, input, out partial_input);
if (parser == null){
compiled = null;
if (partial_input)
return input;
ParseString (ParseMode.ReportErrors, input, out partial_input);
return null;
}
object parser_result = parser.InteractiveResult;
if (!(parser_result is Class)){
int errors = ctx.Report.Errors;
NamespaceEntry.VerifyAllUsing ();
if (errors == ctx.Report.Errors)
parser.CurrentNamespace.Extract (using_alias_list, using_list);
else
NamespaceEntry.Reset ();
}
compiled = CompileBlock (parser_result as Class, parser.undo, ctx.Report);
}
return null;
}
/// <summary>
/// Compiles the input string and returns a delegate that represents the compiled code.
/// </summary>
/// <remarks>
///
/// Compiles the input string as a C# expression or
/// statement, unlike the Evaluate method, the
/// resulting delegate can be invoked multiple times
/// without incurring in the compilation overhead.
///
/// This method can only deal with fully formed input
/// strings and does not provide a completion mechanism.
/// If you must deal with partial input (for example for
/// interactive use) use the other overload.
///
/// On success, a delegate is returned that can be used
/// to invoke the method.
///
/// </remarks>
static public CompiledMethod Compile (string input)
{
CompiledMethod compiled;
// Ignore partial inputs
if (Compile (input, out compiled) != null){
// Error, the input was partial.
return null;
}
// Either null (on error) or the compiled method.
return compiled;
}
//
// Todo: Should we handle errors, or expect the calling code to setup
// the recording themselves?
//
/// <summary>
/// Evaluates and expression or statement and returns any result values.
/// </summary>
/// <remarks>
/// Evaluates the input string as a C# expression or
/// statement. If the input string is an expression
/// the result will be stored in the result variable
/// and the result_set variable will be set to true.
///
/// It is necessary to use the result/result_set
/// pair to identify when a result was set (for
/// example, execution of user-provided input can be
/// an expression, a statement or others, and
/// result_set would only be set if the input was an
/// expression.
///
/// If the return value of this function is null,
/// this indicates that the parsing was complete.
/// If the return value is a string, it indicates
/// that the input is partial and that the user
/// should provide an updated string.
/// </remarks>
public static string Evaluate (string input, out object result, out bool result_set)
{
CompiledMethod compiled;
result_set = false;
result = null;
input = Compile (input, out compiled);
if (input != null)
return input;
if (compiled == null)
return null;
//
// The code execution does not need to keep the compiler lock
//
object retval = typeof (NoValueSet);
try {
invoke_thread = System.Threading.Thread.CurrentThread;
invoking = true;
compiled (ref retval);
} catch (ThreadAbortException e){
Thread.ResetAbort ();
Console.WriteLine ("Interrupted!\n{0}", e);
} finally {
invoking = false;
}
//
// We use a reference to a compiler type, in this case
// Driver as a flag to indicate that this was a statement
//
if (retval != typeof (NoValueSet)){
result_set = true;
result = retval;
}
return null;
}
public static string [] GetCompletions (string input, out string prefix)
{
prefix = "";
if (input == null || input.Length == 0)
return null;
lock (evaluator_lock){
if (!inited)
Init ();
bool partial_input;
CSharpParser parser = ParseString (ParseMode.GetCompletions, input, out partial_input);
if (parser == null){
if (CSharpParser.yacc_verbose_flag != 0)
Console.WriteLine ("DEBUG: No completions available");
return null;
}
Class parser_result = parser.InteractiveResult as Class;
if (parser_result == null){
if (CSharpParser.yacc_verbose_flag != 0)
Console.WriteLine ("Do not know how to cope with !Class yet");
return null;
}
try {
RootContext.ResolveTree ();
if (ctx.Report.Errors != 0)
return null;
RootContext.PopulateTypes ();
if (ctx.Report.Errors != 0)
return null;
MethodOrOperator method = null;
foreach (MemberCore member in parser_result.Methods){
if (member.Name != "Host")
continue;
method = (MethodOrOperator) member;
break;
}
if (method == null)
throw new InternalErrorException ("did not find the the Host method");
BlockContext bc = new BlockContext (method, method.Block, method.ReturnType);
try {
method.Block.Resolve (null, bc, method.ParameterInfo, method);
} catch (CompletionResult cr){
prefix = cr.BaseText;
return cr.Result;
}
} finally {
parser.undo.ExecuteUndo ();
}
}
return null;
}
/// <summary>
/// Executes the given expression or statement.
/// </summary>
/// <remarks>
/// Executes the provided statement, returns true
/// on success, false on parsing errors. Exceptions
/// might be thrown by the called code.
/// </remarks>
public static bool Run (string statement)
{
if (!inited)
Init ();
object result;
bool result_set;
bool ok = Evaluate (statement, out result, out result_set) == null;
return ok;
}
/// <summary>
/// Evaluates and expression or statement and returns the result.
/// </summary>
/// <remarks>
/// Evaluates the input string as a C# expression or
/// statement and returns the value.
///
/// This method will throw an exception if there is a syntax error,
/// of if the provided input is not an expression but a statement.
/// </remarks>
public static object Evaluate (string input)
{
object result;
bool result_set;
string r = Evaluate (input, out result, out result_set);
if (r != null)
throw new ArgumentException ("Syntax error on input: partial input");
if (result_set == false)
throw new ArgumentException ("The expression did not set a result");
return result;
}
enum InputKind {
EOF,
StatementOrExpression,
CompilationUnit,
Error
}
//
// Deambiguates the input string to determine if we
// want to process a statement or if we want to
// process a compilation unit.
//
// This is done using a top-down predictive parser,
// since the yacc/jay parser can not deambiguage this
// without more than one lookahead token. There are very
// few ambiguities.
//
static InputKind ToplevelOrStatement (SeekableStreamReader seekable)
{
Tokenizer tokenizer = new Tokenizer (seekable, (CompilationUnit) Location.SourceFiles [0], ctx);
int t = tokenizer.token ();
switch (t){
case Token.EOF:
return InputKind.EOF;
// These are toplevels
case Token.EXTERN:
case Token.OPEN_BRACKET:
case Token.ABSTRACT:
case Token.CLASS:
case Token.ENUM:
case Token.INTERFACE:
case Token.INTERNAL:
case Token.NAMESPACE:
case Token.PRIVATE:
case Token.PROTECTED:
case Token.PUBLIC:
case Token.SEALED:
case Token.STATIC:
case Token.STRUCT:
return InputKind.CompilationUnit;
// Definitely expression
case Token.FIXED:
case Token.BOOL:
case Token.BYTE:
case Token.CHAR:
case Token.DECIMAL:
case Token.DOUBLE:
case Token.FLOAT:
case Token.INT:
case Token.LONG:
case Token.NEW:
case Token.OBJECT:
case Token.SBYTE:
case Token.SHORT:
case Token.STRING:
case Token.UINT:
case Token.ULONG:
return InputKind.StatementOrExpression;
// These need deambiguation help
case Token.USING:
t = tokenizer.token ();
if (t == Token.EOF)
return InputKind.EOF;
if (t == Token.IDENTIFIER)
return InputKind.CompilationUnit;
return InputKind.StatementOrExpression;
// Distinguish between:
// delegate opt_anonymous_method_signature block
// delegate type
case Token.DELEGATE:
t = tokenizer.token ();
if (t == Token.EOF)
return InputKind.EOF;
if (t == Token.OPEN_PARENS || t == Token.OPEN_BRACE)
return InputKind.StatementOrExpression;
return InputKind.CompilationUnit;
// Distinguih between:
// unsafe block
// unsafe as modifier of a type declaration
case Token.UNSAFE:
t = tokenizer.token ();
if (t == Token.EOF)
return InputKind.EOF;
if (t == Token.OPEN_PARENS)
return InputKind.StatementOrExpression;
return InputKind.CompilationUnit;
// These are errors: we list explicitly what we had
// from the grammar, ERROR and then everything else
case Token.READONLY:
case Token.OVERRIDE:
case Token.ERROR:
return InputKind.Error;
// This catches everything else allowed by
// expressions. We could add one-by-one use cases
// if needed.
default:
return InputKind.StatementOrExpression;
}
}
//
// Parses the string @input and returns a CSharpParser if succeeful.
//
// if @silent is set to true then no errors are
// reported to the user. This is used to do various calls to the
// parser and check if the expression is parsable.
//
// @partial_input: if @silent is true, then it returns whether the
// parsed expression was partial, and more data is needed
//
static CSharpParser ParseString (ParseMode mode, string input, out bool partial_input)
{
partial_input = false;
Reset ();
queued_fields.Clear ();
Tokenizer.LocatedToken.Initialize ();
Stream s = new MemoryStream (Encoding.Default.GetBytes (input));
SeekableStreamReader seekable = new SeekableStreamReader (s, Encoding.Default);
InputKind kind = ToplevelOrStatement (seekable);
if (kind == InputKind.Error){
if (mode == ParseMode.ReportErrors)
ctx.Report.Error (-25, "Detection Parsing Error");
partial_input = false;
return null;
}
if (kind == InputKind.EOF){
if (mode == ParseMode.ReportErrors)
Console.Error.WriteLine ("Internal error: EOF condition should have been detected in a previous call with silent=true");
partial_input = true;
return null;
}
seekable.Position = 0;
CSharpParser parser = new CSharpParser (seekable, (CompilationUnit) Location.SourceFiles [0], ctx);
if (kind == InputKind.StatementOrExpression){
parser.Lexer.putback_char = Tokenizer.EvalStatementParserCharacter;
RootContext.StatementMode = true;
} else {
//
// Do not activate EvalCompilationUnitParserCharacter until
// I have figured out all the limitations to invoke methods
// in the generated classes. See repl.txt
//
parser.Lexer.putback_char = Tokenizer.EvalUsingDeclarationsParserCharacter;
//parser.Lexer.putback_char = Tokenizer.EvalCompilationUnitParserCharacter;
RootContext.StatementMode = false;
}
if (mode == ParseMode.GetCompletions)
parser.Lexer.CompleteOnEOF = true;
ReportPrinter old_printer = null;
if ((mode == ParseMode.Silent || mode == ParseMode.GetCompletions) && CSharpParser.yacc_verbose_flag == 0)
old_printer = SetPrinter (new StreamReportPrinter (TextWriter.Null));
try {
parser.parse ();
} finally {
if (ctx.Report.Errors != 0){
if (mode != ParseMode.ReportErrors && parser.UnexpectedEOF)
partial_input = true;
parser.undo.ExecuteUndo ();
parser = null;
}
if (old_printer != null)
SetPrinter (old_printer);
}
return parser;
}
//
// Queue all the fields that we use, as we need to then go from FieldBuilder to FieldInfo
// or reflection gets confused (it basically gets confused, and variables override each
// other).
//
static List<Field> queued_fields = new List<Field> ();
//static ArrayList types = new ArrayList ();
static volatile bool invoking;
static CompiledMethod CompileBlock (Class host, Undo undo, Report Report)
{
RootContext.ResolveTree ();
if (Report.Errors != 0){
undo.ExecuteUndo ();
return null;
}
RootContext.PopulateTypes ();
if (Report.Errors != 0){
undo.ExecuteUndo ();
return null;
}
TypeBuilder tb = null;
MethodBuilder mb = null;
if (host != null){
tb = host.TypeBuilder;
mb = null;
foreach (MemberCore member in host.Methods){
if (member.Name != "Host")
continue;
MethodOrOperator method = (MethodOrOperator) member;
mb = method.MethodBuilder;
break;
}
if (mb == null)
throw new Exception ("Internal error: did not find the method builder for the generated method");
}
RootContext.EmitCode ();
if (Report.Errors != 0){
undo.ExecuteUndo ();
return null;
}
RootContext.CloseTypes (ctx);
if (Environment.GetEnvironmentVariable ("SAVE") != null)
CodeGen.Save (current_debug_name, false, Report);
if (host == null)
return null;
//
// Unlike Mono, .NET requires that the MethodInfo is fetched, it cant
// work from MethodBuilders. Retarded, I know.
//
var tt = CodeGen.Assembly.Builder.GetType (tb.Name);
MethodInfo mi = tt.GetMethod (mb.Name);
// Pull the FieldInfos from the type, and keep track of them
foreach (Field field in queued_fields){
FieldInfo fi = tt.GetField (field.Name);
Tuple<FieldSpec, FieldInfo> old;
// If a previous value was set, nullify it, so that we do
// not leak memory
if (fields.TryGetValue (field.Name, out old)) {
if (old.Item1.MemberType.IsStruct) {
//
// TODO: Clear fields for structs
//
} else {
try {
old.Item2.SetValue (null, null);
} catch {
}
}
fields [field.Name] = Tuple.Create (old.Item1, fi);
} else {
fields.Add (field.Name, Tuple.Create (field.Spec, fi));
}
}
//types.Add (tb);
queued_fields.Clear ();
return (CompiledMethod) System.Delegate.CreateDelegate (typeof (CompiledMethod), mi);
}
static internal void LoadAliases (NamespaceEntry ns)
{
ns.Populate (using_alias_list, using_list);
}
/// <summary>
/// A sentinel value used to indicate that no value was
/// was set by the compiled function. This is used to
/// differentiate between a function not returning a
/// value and null.
/// </summary>
public class NoValueSet {
}
static internal Tuple<FieldSpec, FieldInfo> LookupField (string name)
{
Tuple<FieldSpec, FieldInfo> fi;
fields.TryGetValue (name, out fi);
return fi;
}
//
// Puts the FieldBuilder into a queue of names that will be
// registered. We can not register FieldBuilders directly
// we need to fetch the FieldInfo after Reflection cooks the
// types, or bad things happen (bad means: FieldBuilders behave
// incorrectly across multiple assemblies, causing assignments to
// invalid areas
//
// This also serves for the parser to register Field classes
// that should be exposed as global variables
//
static internal void QueueField (Field f)
{
queued_fields.Add (f);
}
static string Quote (string s)
{
if (s.IndexOf ('"') != -1)
s = s.Replace ("\"", "\\\"");
return "\"" + s + "\"";
}
static public string GetUsing ()
{
lock (evaluator_lock){
StringBuilder sb = new StringBuilder ();
foreach (object x in using_alias_list)
sb.Append (String.Format ("using {0};\n", x));
foreach (object x in using_list)
sb.Append (String.Format ("using {0};\n", x));
return sb.ToString ();
}
}
static internal ICollection<string> GetUsingList ()
{
var res = new List<string> (using_list.Count);
foreach (object ue in using_list)
res.Add (ue.ToString ());
return res;
}
static internal string [] GetVarNames ()
{
lock (evaluator_lock){
return new List<string> (fields.Keys).ToArray ();
}
}
static public string GetVars ()
{
lock (evaluator_lock){
StringBuilder sb = new StringBuilder ();
foreach (var de in fields){
var fi = LookupField (de.Key);
object value;
try {
value = fi.Item2.GetValue (null);
if (value is string)
value = Quote ((string)value);
} catch {
value = "<error reading value>";
}
sb.AppendFormat ("{0} {1} = {2}", fi.Item1.MemberType.GetSignatureForError (), de.Key, value);
sb.AppendLine ();
}
return sb.ToString ();
}
}
/// <summary>
/// Loads the given assembly and exposes the API to the user.
/// </summary>
static public void LoadAssembly (string file)
{
lock (evaluator_lock){
driver.LoadAssembly (file, false);
ctx.GlobalRootNamespace.ComputeNamespaces (ctx);
}
}
/// <summary>
/// Exposes the API of the given assembly to the Evaluator
/// </summary>
static public void ReferenceAssembly (Assembly a)
{
lock (evaluator_lock){
// GlobalRootNamespace.Instance.AddAssemblyReference (a);
// GlobalRootNamespace.Instance.ComputeNamespaces (ctx);
ctx.MetaImporter.ImportAssembly (a, ctx.GlobalRootNamespace);
}
}
/// <summary>
/// If true, turns type expressions into valid expressions
/// and calls the describe method on it
/// </summary>
public static bool DescribeTypeExpressions;
}
/// <summary>
/// A delegate that can be used to invoke the
/// compiled expression or statement.
/// </summary>
/// <remarks>
/// Since the Compile methods will compile
/// statements and expressions into the same
/// delegate, you can tell if a value was returned
/// by checking whether the returned value is of type
/// NoValueSet.
/// </remarks>
public delegate void CompiledMethod (ref object retvalue);
/// <summary>
/// The default base class for every interaction line
/// </summary>
/// <remarks>
/// The expressions and statements behave as if they were
/// a static method of this class. The InteractiveBase class
/// contains a number of useful methods, but can be overwritten
/// by setting the InteractiveBaseType property in the Evaluator
/// </remarks>
public class InteractiveBase {
/// <summary>
/// Determines where the standard output of methods in this class will go.
/// </summary>
public static TextWriter Output = Console.Out;
/// <summary>
/// Determines where the standard error of methods in this class will go.
/// </summary>
public static TextWriter Error = Console.Error;
/// <summary>
/// The primary prompt used for interactive use.
/// </summary>
public static string Prompt = "csharp> ";
/// <summary>
/// The secondary prompt used for interactive use (used when
/// an expression is incomplete).
/// </summary>
public static string ContinuationPrompt = " > ";
/// <summary>
/// Used to signal that the user has invoked the `quit' statement.
/// </summary>
public static bool QuitRequested;
/// <summary>
/// Shows all the variables defined so far.
/// </summary>
static public void ShowVars ()
{
Output.Write (Evaluator.GetVars ());
Output.Flush ();
}
/// <summary>
/// Displays the using statements in effect at this point.
/// </summary>
static public void ShowUsing ()
{
Output.Write (Evaluator.GetUsing ());
Output.Flush ();
}
public delegate void Simple ();
/// <summary>
/// Times the execution of the given delegate
/// </summary>
static public TimeSpan Time (Simple a)
{
DateTime start = DateTime.Now;
a ();
return DateTime.Now - start;
}
#if !SMCS_SOURCE
/// <summary>
/// Loads the assemblies from a package
/// </summary>
/// <remarks>
/// Loads the assemblies from a package. This is equivalent
/// to passing the -pkg: command line flag to the C# compiler
/// on the command line.
/// </remarks>