codegen.cs

C#编译器源代码。Micorsoft开放源代码

		//
		public void EmitCapturedVariableInstance (LocalInfo li)
		{
			if (capture_context == null)
				throw new Exception ("Calling EmitCapturedContext when there is no capture_context");
			
			capture_context.EmitCapturedVariableInstance (this, li, CurrentAnonymousMethod);
		}

		public void EmitParameter (string name)
		{
			capture_context.EmitParameter (this, name);
		}

		public void EmitAssignParameter (string name, Expression source, bool leave_copy, bool prepare_for_load)
		{
			capture_context.EmitAssignParameter (this, name, source, leave_copy, prepare_for_load);
		}

		public void EmitAddressOfParameter (string name)
		{
			capture_context.EmitAddressOfParameter (this, name);
		}
		
		public Expression GetThis (Location loc)
		{
			This my_this;
			if (CurrentBlock != null)
				my_this = new This (CurrentBlock, loc);
			else
				my_this = new This (loc);

			if (!my_this.ResolveBase (this))
				my_this = null;

			return my_this;
		}
	}


	public abstract class CommonAssemblyModulClass : Attributable {
		protected CommonAssemblyModulClass ():
			base (null)
		{
		}

		public void AddAttributes (ArrayList attrs)
		{
			if (OptAttributes == null) {
				OptAttributes = new Attributes (attrs);
				return;
			}
			OptAttributes.AddAttributes (attrs);
		}

		public virtual void Emit (TypeContainer tc) 
		{
			if (OptAttributes == null)
				return;

			EmitContext ec = new EmitContext (tc, Mono.CSharp.Location.Null, null, null, 0, false);
			OptAttributes.Emit (ec, this);
		}
                
		protected Attribute ResolveAttribute (Type a_type)
		{
			if (OptAttributes == null)
				return null;

			// Ensure that we only have GlobalAttributes, since the Search below isn't safe with other types.
			if (!OptAttributes.CheckTargets (this))
				return null;

			EmitContext temp_ec = new EmitContext (RootContext.Tree.Types, Mono.CSharp.Location.Null, null, null, 0, false);
			Attribute a = OptAttributes.Search (a_type, temp_ec);
			if (a != null) {
				a.Resolve (temp_ec);
			}
			return a;
		}
	}
                
	public class AssemblyClass : CommonAssemblyModulClass {
		// TODO: make it private and move all builder based methods here
		public AssemblyBuilder Builder;
		bool is_cls_compliant;
		bool wrap_non_exception_throws;

		public Attribute ClsCompliantAttribute;

		ListDictionary declarative_security;

		// Module is here just because of error messages
		static string[] attribute_targets = new string [] { "assembly", "module" };

		public AssemblyClass (): base ()
		{
			wrap_non_exception_throws = true;
		}

		public bool IsClsCompliant {
			get {
				return is_cls_compliant;
			}
		}

		public bool WrapNonExceptionThrows {
			get {
				return wrap_non_exception_throws;
			}
		}

		public override AttributeTargets AttributeTargets {
			get {
				return AttributeTargets.Assembly;
			}
		}

		public override bool IsClsCompliaceRequired(DeclSpace ds)
		{
			return is_cls_compliant;
		}

		public void Resolve ()
		{
			ClsCompliantAttribute = ResolveAttribute (TypeManager.cls_compliant_attribute_type);
			if (ClsCompliantAttribute != null) {
				is_cls_compliant = ClsCompliantAttribute.GetClsCompliantAttributeValue (null);
			}

#if NET_2_0
			Attribute a = ResolveAttribute (TypeManager.runtime_compatibility_attr_type);
			if (a != null) {
				object val = a.GetPropertyValue ("WrapNonExceptionThrows");
				if (val != null)
					wrap_non_exception_throws = (bool)val;
			}
#endif
		}

		// fix bug #56621
		private void SetPublicKey (AssemblyName an, byte[] strongNameBlob) 
		{
			try {
				// check for possible ECMA key
				if (strongNameBlob.Length == 16) {
					// will be rejected if not "the" ECMA key
					an.SetPublicKey (strongNameBlob);
				}
				else {
					// take it, with or without, a private key
					RSA rsa = CryptoConvert.FromCapiKeyBlob (strongNameBlob);
					// and make sure we only feed the public part to Sys.Ref
					byte[] publickey = CryptoConvert.ToCapiPublicKeyBlob (rsa);
					
					// AssemblyName.SetPublicKey requires an additional header
					byte[] publicKeyHeader = new byte [12] { 0x00, 0x24, 0x00, 0x00, 0x04, 0x80, 0x00, 0x00, 0x94, 0x00, 0x00, 0x00 };

					byte[] encodedPublicKey = new byte [12 + publickey.Length];
					Buffer.BlockCopy (publicKeyHeader, 0, encodedPublicKey, 0, 12);
					Buffer.BlockCopy (publickey, 0, encodedPublicKey, 12, publickey.Length);
					an.SetPublicKey (encodedPublicKey);
				}
			}
			catch (Exception) {
				Error_AssemblySigning ("The speficied file `" + RootContext.StrongNameKeyFile + "' is incorrectly encoded");
				Environment.Exit (1);
			}
		}

		// TODO: rewrite this code (to kill N bugs and make it faster) and use standard ApplyAttribute way.
		public AssemblyName GetAssemblyName (string name, string output) 
		{
			if (OptAttributes != null) {
				foreach (Attribute a in OptAttributes.Attrs) {
					// cannot rely on any resolve-based members before you call Resolve
					if (a.ExplicitTarget == null || a.ExplicitTarget != "assembly")
						continue;

					// TODO: This code is buggy: comparing Attribute name without resolving is wrong.
					//       However, this is invoked by CodeGen.Init, when none of the namespaces
					//       are loaded yet.
					// TODO: Does not handle quoted attributes properly
					switch (a.Name) {
						case "AssemblyKeyFile":
						case "AssemblyKeyFileAttribute":
						case "System.Reflection.AssemblyKeyFileAttribute":
							if (RootContext.StrongNameKeyFile != null) {
								Report.SymbolRelatedToPreviousError (a.Location, a.Name);
								Report.Warning (1616, "Option `{0}' overrides attribute `{1}' given in a source file or added module",
                                    "keyfile", "System.Reflection.AssemblyKeyFileAttribute");
							}
							else {
								string value = a.GetString ();
								if (value != String.Empty)
									RootContext.StrongNameKeyFile = value;
							}
							break;
						case "AssemblyKeyName":
						case "AssemblyKeyNameAttribute":
						case "System.Reflection.AssemblyKeyNameAttribute":
							if (RootContext.StrongNameKeyContainer != null) {
								Report.SymbolRelatedToPreviousError (a.Location, a.Name);
								Report.Warning (1616, "Option `{0}' overrides attribute `{1}' given in a source file or added module",
									"keycontainer", "System.Reflection.AssemblyKeyNameAttribute");
							}
							else {
								string value = a.GetString ();
								if (value != String.Empty)
									RootContext.StrongNameKeyContainer = value;
							}
							break;
						case "AssemblyDelaySign":
						case "AssemblyDelaySignAttribute":
						case "System.Reflection.AssemblyDelaySignAttribute":
							RootContext.StrongNameDelaySign = a.GetBoolean ();
							break;
					}
				}
			}

			AssemblyName an = new AssemblyName ();
			an.Name = Path.GetFileNameWithoutExtension (name);

			// note: delay doesn't apply when using a key container
			if (RootContext.StrongNameKeyContainer != null) {
				an.KeyPair = new StrongNameKeyPair (RootContext.StrongNameKeyContainer);
				return an;
			}

			// strongname is optional
			if (RootContext.StrongNameKeyFile == null)
				return an;

			string AssemblyDir = Path.GetDirectoryName (output);

			// the StrongName key file may be relative to (a) the compiled
			// file or (b) to the output assembly. See bugzilla #55320
			// http://bugzilla.ximian.com/show_bug.cgi?id=55320

			// (a) relative to the compiled file
			string filename = Path.GetFullPath (RootContext.StrongNameKeyFile);
			bool exist = File.Exists (filename);
			if ((!exist) && (AssemblyDir != null) && (AssemblyDir != String.Empty)) {
				// (b) relative to the outputed assembly
				filename = Path.GetFullPath (Path.Combine (AssemblyDir, RootContext.StrongNameKeyFile));
				exist = File.Exists (filename);
			}

			if (exist) {
				using (FileStream fs = new FileStream (filename, FileMode.Open, FileAccess.Read)) {
					byte[] snkeypair = new byte [fs.Length];
					fs.Read (snkeypair, 0, snkeypair.Length);

					if (RootContext.StrongNameDelaySign) {
						// delayed signing - DO NOT include private key
						SetPublicKey (an, snkeypair);
					}
					else {
						// no delay so we make sure we have the private key
						try {
							CryptoConvert.FromCapiPrivateKeyBlob (snkeypair);
							an.KeyPair = new StrongNameKeyPair (snkeypair);
						}
						catch (CryptographicException) {
							if (snkeypair.Length == 16) {
								// error # is different for ECMA key
								Report.Error (1606, "Could not sign the assembly. " + 
									"ECMA key can only be used to delay-sign assemblies");
							}
							else {
								Error_AssemblySigning ("The speficied file `" + RootContext.StrongNameKeyFile + "' does not have a private key");
							}
							return null;
						}
					}
				}
			}
			else {
				Error_AssemblySigning ("The speficied file `" + RootContext.StrongNameKeyFile + "' does not exist");
				return null;
			}
			return an;
		}

		void Error_AssemblySigning (string text)
		{
			Report.Error (1548, "Error during assembly signing. " + text);
		}

		public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder customBuilder)
		{
			if (a.Type.IsSubclassOf (TypeManager.security_attr_type) && a.CheckSecurityActionValidity (true)) {
				if (declarative_security == null)
					declarative_security = new ListDictionary ();

				a.ExtractSecurityPermissionSet (declarative_security);
				return;
			}

			if (a.Type == TypeManager.assembly_culture_attribute_type) {
				string value = a.GetString ();
				if (value == null || value.Length == 0)
					return;

				if (RootContext.Target == Target.Exe) {
					a.Error_AttributeEmitError ("The executables cannot be satelite assemblies, remove the attribute or keep it empty");
					return;
				}
			}

			Builder.SetCustomAttribute (customBuilder);
		}

		public override void Emit (TypeContainer tc)
		{
			base.Emit (tc);

			if (declarative_security != null) {

				MethodInfo add_permission = typeof (AssemblyBuilder).GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);
				object builder_instance = Builder;

				try {
					// Microsoft runtime hacking
					if (add_permission == null) {
						Type assembly_builder = typeof (AssemblyBuilder).Assembly.GetType ("System.Reflection.Emit.AssemblyBuilderData");
						add_permission = assembly_builder.GetMethod ("AddPermissionRequests", BindingFlags.Instance | BindingFlags.NonPublic);

						FieldInfo fi = typeof (AssemblyBuilder).GetField ("m_assemblyData", BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.GetField);
						builder_instance = fi.GetValue (Builder);
					}

					object[] args = new object [] { declarative_security [SecurityAction.RequestMinimum],
												  declarative_security [SecurityAction.RequestOptional],
												  declarative_security [SecurityAction.RequestRefuse] };
					add_permission.Invoke (builder_instance, args);
				}
				catch {
					Report.RuntimeMissingSupport (Location.Null, "assembly permission setting");
				}
			}

#if NET_2_0
			if (!OptAttributes.Contains (TypeManager.runtime_compatibility_attr_type, null)) {
				ConstructorInfo ci = TypeManager.runtime_compatibility_attr_type.GetConstructor (TypeManager.NoTypes);
				PropertyInfo pi = TypeManager.runtime_compatibility_attr_type.GetProperty ("WrapNonExceptionThrows");
				Builder.SetCustomAttribute (new CustomAttributeBuilder (ci, new object [0], 
					new PropertyInfo [] { pi }, new object[] { true } ));
			}
#endif
		}

		public override string[] ValidAttributeTargets {
			get {
				return attribute_targets;
			}
		}
	}

	public class ModuleClass : CommonAssemblyModulClass {
		// TODO: make it private and move all builder based methods here
		public ModuleBuilder Builder;
		bool m_module_is_unsafe;

		public CharSet DefaultCharSet = CharSet.Ansi;
		public TypeAttributes DefaultCharSetType = TypeAttributes.AnsiClass;

		static string[] attribute_targets = new string [] { "module" };

		public ModuleClass (bool is_unsafe)
		{
			m_module_is_unsafe = is_unsafe;
		}

 		public override AttributeTargets AttributeTargets {
 			get {
 				return AttributeTargets.Module;
 			}
		}

		public override bool IsClsCompliaceRequired(DeclSpace ds)
		{
			return CodeGen.Assembly.IsClsCompliant;
		}

		public override void Emit (TypeContainer tc) 
		{
			base.Emit (tc);

			if (!m_module_is_unsafe)
				return;

			if (TypeManager.unverifiable_code_ctor == null) {
				Console.WriteLine ("Internal error ! Cannot set unverifiable code attribute.");
				return;
			}
				
			Builder.SetCustomAttribute (new CustomAttributeBuilder (TypeManager.unverifiable_code_ctor, new object [0]));
		}
                
		public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder customBuilder)
		{
			if (a.Type == TypeManager.cls_compliant_attribute_type) {
				if (CodeGen.Assembly.ClsCompliantAttribute == null) {
					Report.Warning (3012, a.Location, "You must specify the CLSCompliant attribute on the assembly, not the module, to enable CLS compliance checking");
				}
				else if (CodeGen.Assembly.IsClsCompliant != a.GetBoolean ()) {
					Report.SymbolRelatedToPreviousError (CodeGen.Assembly.ClsCompliantAttribute.Location, CodeGen.Assembly.ClsCompliantAttribute.GetSignatureForError ());
					Report.Error (3017, a.Location, "You cannot specify the CLSCompliant attribute on a module that differs from the CLSCompliant attribute on the assembly");
					return;
				}
			}

			Builder.SetCustomAttribute (customBuilder);
		}

		/// <summary>
		/// It is called very early therefore can resolve only predefined attributes
		/// </summary>
		public void ResolveAttributes ()
		{
#if NET_2_0
			Attribute a = ResolveAttribute (TypeManager.default_charset_type);
			if (a != null) {
				DefaultCharSet = a.GetCharSetValue ();
				switch (DefaultCharSet) {
					case CharSet.Ansi:
					case CharSet.None:
						break;
					case CharSet.Auto:
						DefaultCharSetType = TypeAttributes.AutoClass;
						break;
					case CharSet.Unicode:
						DefaultCharSetType = TypeAttributes.UnicodeClass;
						break;
					default:
						Report.Error (1724, a.Location, "Value specified for the argument to 'System.Runtime.InteropServices.DefaultCharSetAttribute' is not valid");
						break;
				}
			}
#endif
		}

		public override string[] ValidAttributeTargets {
			get {
				return attribute_targets;
			}
		}
	}
}