/// <summary>
/// Creates a delegate that does type conversion and calls the bound method.
/// </summary>
/// <param name="argumentCount"> The number of arguments that will be passed to the delegate. </param>
/// <returns> A delegate that does type conversion and calls the method represented by this
/// object. </returns>
/// <remarks> No caching of the result occurs. </remarks>
private BinderDelegate CreateDelegateCore(int argumentCount)
{
// Create a new dynamic method.
System.Reflection.Emit.DynamicMethod dm;
ILGenerator generator;
if (ScriptEngine.LowPrivilegeEnvironment == false)
{
// Full trust only - skips visibility checks.
dm = new System.Reflection.Emit.DynamicMethod(
string.Format("binder_for_{0}", this.FullName), // Name of the generated method.
typeof(object), // Return type of the generated method.
new[] { typeof(ScriptEngine), typeof(object), typeof(object[]) }, // Parameter types of the generated method.
typeof(JSBinder), // Owner type.
true); // Skips visibility checks.
generator = new DynamicILGenerator(dm);
}
else
{
// Partial trust / silverlight.
dm = new System.Reflection.Emit.DynamicMethod(
string.Format("binder_for_{0}", this.FullName), // Name of the generated method.
typeof(object), // Return type of the generated method.
new[] { typeof(ScriptEngine), typeof(object), typeof(object[]) }); // Parameter types of the generated method.
generator = new ReflectionEmitILGenerator(dm.GetILGenerator());
}
// Generate the body of the method.
GenerateStub(generator, argumentCount);
// Convert the DynamicMethod to a delegate.
return((BinderDelegate)dm.CreateDelegate(typeof(BinderDelegate)));
}
/// <summary>
/// Generates IL for the script.
/// </summary>
public void GenerateCode()
{
// Generate the abstract syntax tree if it hasn't already been generated.
if (this.AbstractSyntaxTree == null)
{
Parse();
Optimize();
}
// Initialize global code-gen information.
var optimizationInfo = new OptimizationInfo(this.Engine)
{
AbstractSyntaxTree = this.AbstractSyntaxTree,
StrictMode = this.StrictMode,
MethodOptimizationHints = this.MethodOptimizationHints,
FunctionName = this.GetStackName(),
Source = this.Source
};
ILGenerator generator;
if (this.Options.EnableDebugging == false)
{
// DynamicMethod requires full trust because of generator.LoadMethodPointer in the
// FunctionExpression class.
// Create a new dynamic method.
System.Reflection.Emit.DynamicMethod dynamicMethod;
if (ScriptEngine.LowPrivilegeEnvironment == false)
{
// High privilege path.
dynamicMethod = new System.Reflection.Emit.DynamicMethod(
GetMethodName(), // Name of the generated method.
typeof(object), // Return type of the generated method.
GetParameterTypes(), // Parameter types of the generated method.
typeof(MethodGenerator), // Owner type.
true); // Skip visibility checks.
// TODO: Figure out why long methods give BadImageFormatException in .NET 3.5 when generated using DynamicILInfo.
if (Environment.Version.Major >= 4)
{
generator = new DynamicILGenerator(dynamicMethod);
}
else
{
generator = new ReflectionEmitILGenerator(dynamicMethod.GetILGenerator());
}
}
else
{
// Low privilege path.
dynamicMethod = new System.Reflection.Emit.DynamicMethod(
GetMethodName(), // Name of the generated method.
typeof(object), // Return type of the generated method.
GetParameterTypes()); // Parameter types of the generated method.
generator = new ReflectionEmitILGenerator(dynamicMethod.GetILGenerator());
}
if (this.Engine.EnableILAnalysis)
{
// Replace the generator with one that logs.
generator = new LoggingILGenerator(generator);
}
// Initialization code will appear to come from line 1.
optimizationInfo.MarkSequencePoint(generator, new SourceCodeSpan(1, 1, 1, 1));
// Generate the IL.
GenerateCode(generator, optimizationInfo);
generator.Complete();
// Create a delegate from the method.
this.GeneratedMethod = new GeneratedMethod(dynamicMethod.CreateDelegate(GetDelegate()), optimizationInfo.NestedFunctions);
}
else
{
#if WINDOWS_PHONE
throw new NotImplementedException();
#else
// Debugging or low trust path.
ScriptEngine.ReflectionEmitModuleInfo reflectionEmitInfo = this.Engine.ReflectionEmitInfo;
if (reflectionEmitInfo == null)
{
reflectionEmitInfo = new ScriptEngine.ReflectionEmitModuleInfo
{
AssemblyBuilder = System.Threading.Thread.GetDomain().DefineDynamicAssembly(
new System.Reflection.AssemblyName("Jurassic Dynamic Assembly"),
System.Reflection.Emit.AssemblyBuilderAccess.Run)
};
// Create a dynamic assembly and module.
// Mark the assembly as debuggable. This must be done before the module is created.
var debuggableAttributeConstructor = typeof(System.Diagnostics.DebuggableAttribute).GetConstructor(
new[] { typeof(System.Diagnostics.DebuggableAttribute.DebuggingModes) });
if (debuggableAttributeConstructor != null)
{
reflectionEmitInfo.AssemblyBuilder.SetCustomAttribute(
new System.Reflection.Emit.CustomAttributeBuilder(debuggableAttributeConstructor,
new object[] {
System.Diagnostics.DebuggableAttribute.DebuggingModes.DisableOptimizations |
System.Diagnostics.DebuggableAttribute.DebuggingModes.Default
}));
}
// Create a dynamic module.
reflectionEmitInfo.ModuleBuilder = reflectionEmitInfo.AssemblyBuilder.DefineDynamicModule("Module", this.Options.EnableDebugging);
this.Engine.ReflectionEmitInfo = reflectionEmitInfo;
}
// Create a new type to hold our method.
var typeBuilder = reflectionEmitInfo.ModuleBuilder.DefineType("JavaScriptClass" + reflectionEmitInfo.TypeCount.ToString(CultureInfo.InvariantCulture), System.Reflection.TypeAttributes.Public | System.Reflection.TypeAttributes.Class);
reflectionEmitInfo.TypeCount++;
// Create a method.
var methodBuilder = typeBuilder.DefineMethod(this.GetMethodName(),
System.Reflection.MethodAttributes.HideBySig | System.Reflection.MethodAttributes.Static | System.Reflection.MethodAttributes.Public,
typeof(object), GetParameterTypes());
// Generate the IL for the method.
generator = new ReflectionEmitILGenerator(methodBuilder.GetILGenerator());
if (this.Engine.EnableILAnalysis)
{
// Replace the generator with one that logs.
generator = new LoggingILGenerator(generator);
}
if (this.Source.Path != null && this.Options.EnableDebugging)
{
// Initialize the debugging information.
optimizationInfo.DebugDocument = reflectionEmitInfo.ModuleBuilder.DefineDocument(this.Source.Path, COMHelpers.LanguageType, COMHelpers.LanguageVendor, COMHelpers.DocumentType);
methodBuilder.DefineParameter(1, System.Reflection.ParameterAttributes.None, "scriptEngine");
methodBuilder.DefineParameter(2, System.Reflection.ParameterAttributes.None, "scope");
methodBuilder.DefineParameter(3, System.Reflection.ParameterAttributes.None, "thisValue");
}
optimizationInfo.MarkSequencePoint(generator, new SourceCodeSpan(1, 1, 1, 1));
GenerateCode(generator, optimizationInfo);
generator.Complete();
// Bake it.
var type = typeBuilder.CreateType();
var methodInfo = type.GetMethod(this.GetMethodName());
this.GeneratedMethod = new GeneratedMethod(Delegate.CreateDelegate(GetDelegate(), methodInfo), optimizationInfo.NestedFunctions);
#endif //WINDOWS_PHONE
}
if (this.Engine.EnableILAnalysis)
{
// Store the disassembled IL so it can be retrieved for analysis purposes.
this.GeneratedMethod.DisassembledIL = generator.ToString();
}
}