source: branches/2817-BinPackingSpeedup/HeuristicLab.ExtLibs/HeuristicLab.NRefactory/5.5.0/NRefactory.CSharp-5.5.0/Parser/mcs/assembly.cs

//
// assembly.cs: Assembly declaration and specifications
//
// Authors:
//   Miguel de Icaza (miguel@ximian.com)
//   Marek Safar (marek.safar@gmail.com)
//
// Copyright 2001, 2002, 2003 Ximian, Inc.
// Copyright 2004-2011 Novell, Inc.
// Copyright 2011-2013 Xamarin Inc
//


using System;
using System.IO;
using System.Collections.Generic;
using System.Globalization;
using System.Security;
using System.Security.Cryptography;
using System.Security.Permissions;
using Mono.Security.Cryptography;
using Mono.CompilerServices.SymbolWriter;

#if STATIC
using IKVM.Reflection;
using IKVM.Reflection.Emit;
using SecurityType = System.Collections.Generic.List<IKVM.Reflection.Emit.CustomAttributeBuilder>;
#else
using SecurityType = System.Collections.Generic.Dictionary<System.Security.Permissions.SecurityAction, System.Security.PermissionSet>;
using System.Reflection;
using System.Reflection.Emit;
#endif

namespace Mono.CSharp
{
  public interface IAssemblyDefinition
  {
    string FullName { get; }
    bool IsCLSCompliant { get; }
    bool IsMissing { get; }
    string Name { get; }

    byte[] GetPublicKeyToken ();
    bool IsFriendAssemblyTo (IAssemblyDefinition assembly);
  }
                
  public abstract class AssemblyDefinition : IAssemblyDefinition
  {
    // TODO: make it private and move all builder based methods here
    public AssemblyBuilder Builder;
    protected AssemblyBuilderExtension builder_extra;
    MonoSymbolFile symbol_writer;

    bool is_cls_compliant;
    bool wrap_non_exception_throws;
    bool wrap_non_exception_throws_custom;
    bool has_user_debuggable;

    protected ModuleContainer module;
    readonly string name;
    protected readonly string file_name;

    byte[] public_key, public_key_token;
    bool delay_sign;

    // Holds private/public key pair when private key
    // was available
    StrongNameKeyPair private_key;  

    Attribute cls_attribute;
    Method entry_point;

    protected List<ImportedModuleDefinition> added_modules;
    SecurityType declarative_security;
    Dictionary<ITypeDefinition, Attribute> emitted_forwarders;
    AssemblyAttributesPlaceholder module_target_attrs;

    // Win32 version info values
    string vi_product, vi_product_version, vi_company, vi_copyright, vi_trademark;

    protected AssemblyDefinition (ModuleContainer module, string name)
    {
      this.module = module;
      this.name = Path.GetFileNameWithoutExtension (name);

      wrap_non_exception_throws = true;

      delay_sign = Compiler.Settings.StrongNameDelaySign;

      //
      // Load strong name key early enough for assembly importer to be able to
      // use the keys for InternalsVisibleTo
      // This should go somewhere close to ReferencesLoading but don't have the place yet
      //
      if (Compiler.Settings.HasKeyFileOrContainer) {
        LoadPublicKey (Compiler.Settings.StrongNameKeyFile, Compiler.Settings.StrongNameKeyContainer);
      }
    }

    protected AssemblyDefinition (ModuleContainer module, string name, string fileName)
      : this (module, name)
    {
      this.file_name = fileName;
    }

    #region Properties

    public Attribute CLSCompliantAttribute {
      get {
        return cls_attribute;
      }
    }

    public CompilerContext Compiler {
      get {
        return module.Compiler;
      }
    }

    //
    // Assembly entry point, aka Main method
    //
    public Method EntryPoint {
      get {
        return entry_point;
      }
      set {
        entry_point = value;
      }
    }

    public string FullName {
      get {
        return Builder.FullName;
      }
    }

    public bool HasCLSCompliantAttribute {
      get {
        return cls_attribute != null;
      }
    }

    // TODO: This should not exist here but will require more changes
    public MetadataImporter Importer {
        get; set;
    }

    public bool IsCLSCompliant {
      get {
        return is_cls_compliant;
      }
    }

    bool IAssemblyDefinition.IsMissing {
      get {
        return false;
      }
    }

    public bool IsSatelliteAssembly { get; private set; }

    public string Name {
      get {
        return name;
      }
    }

    public bool WrapNonExceptionThrows {
      get {
        return wrap_non_exception_throws;
      }
    }

    protected Report Report {
      get {
        return Compiler.Report;
      }
    }

    public MonoSymbolFile SymbolWriter {
      get {
        return symbol_writer;
      }
    }

    #endregion

    public void AddModule (ImportedModuleDefinition module)
    {
      if (added_modules == null) {
        added_modules = new List<ImportedModuleDefinition> ();
        added_modules.Add (module);
      }
    }

    public void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
    {
      if (a.IsValidSecurityAttribute ()) {
        a.ExtractSecurityPermissionSet (ctor, ref declarative_security);
        return;
      }

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

        if (Compiler.Settings.Target == Target.Exe) {
          Report.Error (7059, a.Location, "Executables cannot be satellite assemblies. Remove the attribute or keep it empty");
          return;
        }

        if (value == "neutral")
          value = "";

        if (Compiler.Settings.Target == Target.Module) {
          SetCustomAttribute (ctor, cdata);
        } else {
          builder_extra.SetCulture (value, a.Location);
        }

        IsSatelliteAssembly = true;
        return;
      }

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

        var vinfo = IsValidAssemblyVersion (value, true);
        if (vinfo == null) {
          Report.Error (7034, a.Location, "The specified version string `{0}' does not conform to the required format - major[.minor[.build[.revision]]]",
            value);
          return;
        }

        if (Compiler.Settings.Target == Target.Module) {
          SetCustomAttribute (ctor, cdata);
        } else {
          builder_extra.SetVersion (vinfo, a.Location);
        }

        return;
      }

      if (a.Type == pa.AssemblyAlgorithmId) {
        const int pos = 2; // skip CA header
        uint alg = (uint) cdata [pos];
        alg |= ((uint) cdata [pos + 1]) << 8;
        alg |= ((uint) cdata [pos + 2]) << 16;
        alg |= ((uint) cdata [pos + 3]) << 24;

        if (Compiler.Settings.Target == Target.Module) {
          SetCustomAttribute (ctor, cdata);
        } else {
          builder_extra.SetAlgorithmId (alg, a.Location);
        }

        return;
      }

      if (a.Type == pa.AssemblyFlags) {
        const int pos = 2; // skip CA header
        uint flags = (uint) cdata[pos];
        flags |= ((uint) cdata [pos + 1]) << 8;
        flags |= ((uint) cdata [pos + 2]) << 16;
        flags |= ((uint) cdata [pos + 3]) << 24;

        // Ignore set PublicKey flag if assembly is not strongnamed
        if ((flags & (uint) AssemblyNameFlags.PublicKey) != 0 && public_key == null)
          flags &= ~(uint) AssemblyNameFlags.PublicKey;

        if (Compiler.Settings.Target == Target.Module) {
          SetCustomAttribute (ctor, cdata);
        } else {
          builder_extra.SetFlags (flags, a.Location);
        }

        return;
      }

      if (a.Type == pa.TypeForwarder) {
        TypeSpec t = a.GetArgumentType ();
        if (t == null || TypeManager.HasElementType (t)) {
          Report.Error (735, a.Location, "Invalid type specified as an argument for TypeForwardedTo attribute");
          return;
        }

        if (emitted_forwarders == null) {
          emitted_forwarders = new Dictionary<ITypeDefinition, Attribute> ();
        } else if (emitted_forwarders.ContainsKey (t.MemberDefinition)) {
          Report.SymbolRelatedToPreviousError (emitted_forwarders[t.MemberDefinition].Location, null);
          Report.Error (739, a.Location, "A duplicate type forward of type `{0}'",
            t.GetSignatureForError ());
          return;
        }

        emitted_forwarders.Add (t.MemberDefinition, a);

        if (t.MemberDefinition.DeclaringAssembly == this) {
          Report.SymbolRelatedToPreviousError (t);
          Report.Error (729, a.Location, "Cannot forward type `{0}' because it is defined in this assembly",
            t.GetSignatureForError ());
          return;
        }

        if (t.IsNested) {
          Report.Error (730, a.Location, "Cannot forward type `{0}' because it is a nested type",
            t.GetSignatureForError ());
          return;
        }

        builder_extra.AddTypeForwarder (t.GetDefinition (), a.Location);
        return;
      }

      if (a.Type == pa.Extension) {
        a.Error_MisusedExtensionAttribute ();
        return;
      }

      if (a.Type == pa.InternalsVisibleTo) {
        string assembly_name = a.GetString ();
        if (assembly_name == null) {
          Report.Error (7030, a.Location, "Friend assembly reference cannot have `null' value");
          return;
        }

        if (assembly_name.Length == 0)
          return;
#if STATIC
        ParsedAssemblyName aname;
        ParseAssemblyResult r = Fusion.ParseAssemblyName (assembly_name, out aname);
        if (r != ParseAssemblyResult.OK) {
          Report.Warning (1700, 3, a.Location, "Friend assembly reference `{0}' is invalid and cannot be resolved",
            assembly_name);
          return;
        }

        if (aname.Version != null || aname.Culture != null || aname.ProcessorArchitecture != ProcessorArchitecture.None) {
          Report.Error (1725, a.Location,
            "Friend assembly reference `{0}' is invalid. InternalsVisibleTo declarations cannot have a version, culture or processor architecture specified",
            assembly_name);

          return;
        }

        if (public_key != null && !aname.HasPublicKey) {
          Report.Error (1726, a.Location,
            "Friend assembly reference `{0}' is invalid. Strong named assemblies must specify a public key in their InternalsVisibleTo declarations",
            assembly_name);
          return;
        }
#endif
      } else if (a.Type == pa.RuntimeCompatibility) {
        wrap_non_exception_throws_custom = true;
      } else if (a.Type == pa.AssemblyFileVersion) {
        vi_product_version = a.GetString ();
        if (string.IsNullOrEmpty (vi_product_version) || IsValidAssemblyVersion (vi_product_version, false) == null) {
          Report.Warning (7035, 1, a.Location, "The specified version string `{0}' does not conform to the recommended format major.minor.build.revision",
            vi_product_version, a.Name);
          return;
        }

        // File version info decoding from blob is not supported
        var cab = new CustomAttributeBuilder ((ConstructorInfo) ctor.GetMetaInfo (), new object[] { vi_product_version });
        Builder.SetCustomAttribute (cab);
        return;
      } else if (a.Type == pa.AssemblyProduct) {
        vi_product = a.GetString ();
      } else if (a.Type == pa.AssemblyCompany) {
        vi_company = a.GetString ();
      } else if (a.Type == pa.AssemblyDescription) {
        // TODO: Needs extra api
      } else if (a.Type == pa.AssemblyCopyright) {
        vi_copyright = a.GetString ();
      } else if (a.Type == pa.AssemblyTrademark) {
        vi_trademark = a.GetString ();
      } else if (a.Type == pa.Debuggable) {
        has_user_debuggable = true;
      }

      SetCustomAttribute (ctor, cdata);
    }

    //
    // When using assembly public key attributes InternalsVisibleTo key
    // was not checked, we have to do it later when we actually know what
    // our public key token is
    //
    void CheckReferencesPublicToken ()
    {
      // TODO: It should check only references assemblies but there is
      // no working SRE API
      foreach (var entry in Importer.Assemblies) {
        var a = entry as ImportedAssemblyDefinition;
        if (a == null || a.IsMissing)
          continue;

        if (public_key != null && !a.HasStrongName) {
          Report.Error (1577, "Referenced assembly `{0}' does not have a strong name",
            a.FullName);
        }

        var ci = a.Assembly.GetName ().CultureInfo;
        if (!ci.Equals (CultureInfo.InvariantCulture)) {
          Report.Warning (8009, 1, "Referenced assembly `{0}' has different culture setting of `{1}'",
            a.Name, ci.Name);
        }

        if (!a.IsFriendAssemblyTo (this))
          continue;

        var attr = a.GetAssemblyVisibleToName (this);
        var atoken = attr.GetPublicKeyToken ();

        if (ArrayComparer.IsEqual (GetPublicKeyToken (), atoken))
          continue;

        Report.SymbolRelatedToPreviousError (a.Location);
        Report.Error (281,
          "Friend access was granted to `{0}', but the output assembly is named `{1}'. Try adding a reference to `{0}' or change the output assembly name to match it",
          attr.FullName, FullName);
      }
    }

    protected AssemblyName CreateAssemblyName ()
    {
      var an = new AssemblyName (name);

      if (public_key != null && Compiler.Settings.Target != Target.Module) {
        if (delay_sign) {
          an.SetPublicKey (public_key);
        } else {
          if (public_key.Length == 16) {
            Report.Error (1606, "Could not sign the assembly. ECMA key can only be used to delay-sign assemblies");
          } else if (private_key == null) {
            Error_AssemblySigning ("The specified key file does not have a private key");
          } else {
            an.KeyPair = private_key;
          }
        }
      }

      return an;
    }

    public virtual ModuleBuilder CreateModuleBuilder ()
    {
      if (file_name == null)
        throw new NotSupportedException ("transient module in static assembly");

      var module_name = Path.GetFileName (file_name);

      // Always initialize module without symbolInfo. We could be framework dependent
      // but returned ISymbolWriter does not have all what we need therefore some
      // adaptor will be needed for now we alwayas emit MDB format when generating
      // debug info
      return Builder.DefineDynamicModule (module_name, module_name, false);
    }

    public virtual void Emit ()
    {
      if (Compiler.Settings.Target == Target.Module) {
        module_target_attrs = new AssemblyAttributesPlaceholder (module, name);
        module_target_attrs.CreateContainer ();
        module_target_attrs.DefineContainer ();
        module_target_attrs.Define ();
        module.AddCompilerGeneratedClass (module_target_attrs);
      } else if (added_modules != null) {
        ReadModulesAssemblyAttributes ();
      }

      if (Compiler.Settings.GenerateDebugInfo) {
        symbol_writer = new MonoSymbolFile ();
      }

      module.EmitContainer ();

      if (module.HasExtensionMethod) {
        var pa = module.PredefinedAttributes.Extension;
        if (pa.IsDefined) {
          SetCustomAttribute (pa.Constructor, AttributeEncoder.Empty);
        }
      }

      if (!IsSatelliteAssembly) {
        if (!has_user_debuggable && Compiler.Settings.GenerateDebugInfo) {
          var pa = module.PredefinedAttributes.Debuggable;
          if (pa.IsDefined) {
            var modes = System.Diagnostics.DebuggableAttribute.DebuggingModes.IgnoreSymbolStoreSequencePoints;
            if (!Compiler.Settings.Optimize)
              modes |= System.Diagnostics.DebuggableAttribute.DebuggingModes.DisableOptimizations;

            pa.EmitAttribute (Builder, modes);
          }
        }

        if (!wrap_non_exception_throws_custom) {
          PredefinedAttribute pa = module.PredefinedAttributes.RuntimeCompatibility;
          if (pa.IsDefined && pa.ResolveBuilder ()) {
            var prop = module.PredefinedMembers.RuntimeCompatibilityWrapNonExceptionThrows.Get ();
            if (prop != null) {
              AttributeEncoder encoder = new AttributeEncoder ();
              encoder.EncodeNamedPropertyArgument (prop, new BoolLiteral (Compiler.BuiltinTypes, true, Location.Null));
              SetCustomAttribute (pa.Constructor, encoder.ToArray ());
            }
          }
        }

        if (declarative_security != null) {
#if STATIC
          foreach (var entry in declarative_security) {
            Builder.__AddDeclarativeSecurity (entry);
          }
#else
          throw new NotSupportedException ("Assembly-level security");
#endif
        }
      }

      CheckReferencesPublicToken ();

      SetEntryPoint ();
    }

    public byte[] GetPublicKeyToken ()
    {
      if (public_key == null || public_key_token != null)
        return public_key_token;

      HashAlgorithm ha = SHA1.Create ();
      byte[] hash = ha.ComputeHash (public_key);
      // we need the last 8 bytes in reverse order
      public_key_token = new byte[8];
      Buffer.BlockCopy (hash, hash.Length - 8, public_key_token, 0, 8);
      Array.Reverse (public_key_token, 0, 8);
      return public_key_token;
    }

    //
    // Either keyFile or keyContainer has to be non-null
    //
    void LoadPublicKey (string keyFile, string keyContainer)
    {
      if (keyContainer != null) {
        try {
          private_key = new StrongNameKeyPair (keyContainer);
          public_key = private_key.PublicKey;
        } catch {
          Error_AssemblySigning ("The specified key container `" + keyContainer + "' does not exist");
        }

        return;
      }

      bool key_file_exists = File.Exists (keyFile);

      //
      // For attribute based KeyFile do additional lookup
      // in output assembly path
      //
      if (!key_file_exists && Compiler.Settings.StrongNameKeyFile == null) {
        //
        // The key file can be relative to output assembly
        //
        string test_path = Path.Combine (Path.GetDirectoryName (file_name), keyFile);
        key_file_exists = File.Exists (test_path);
        if (key_file_exists)
          keyFile = test_path;
      }

      if (!key_file_exists) {
        Error_AssemblySigning ("The specified key file `" + keyFile + "' does not exist");
        return;
      }

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

        // check for ECMA key
        if (snkeypair.Length == 16) {
          public_key = snkeypair;
          return;
        }

        try {
          // take it, with or without, a private key
          RSA rsa = CryptoConvert.FromCapiKeyBlob (snkeypair);
          // 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[8] { 0x00, 0x24, 0x00, 0x00, 0x04, 0x80, 0x00, 0x00 };

          // Encode public key
          public_key = new byte[12 + publickey.Length];
          Buffer.BlockCopy (publicKeyHeader, 0, public_key, 0, publicKeyHeader.Length);

          // Length of Public Key (in bytes)
          int lastPart = public_key.Length - 12;
          public_key[8] = (byte) (lastPart & 0xFF);
          public_key[9] = (byte) ((lastPart >> 8) & 0xFF);
          public_key[10] = (byte) ((lastPart >> 16) & 0xFF);
          public_key[11] = (byte) ((lastPart >> 24) & 0xFF);

          Buffer.BlockCopy (publickey, 0, public_key, 12, publickey.Length);
        } catch {
          Error_AssemblySigning ("The specified key file `" + keyFile + "' has incorrect format");
          return;
        }

        if (delay_sign)
          return;

        try {
          // TODO: Is there better way to test for a private key presence ?
          CryptoConvert.FromCapiPrivateKeyBlob (snkeypair);
          private_key = new StrongNameKeyPair (snkeypair);
        } catch { }
      }
    }

    void ReadModulesAssemblyAttributes ()
    {
      foreach (var m in added_modules) {
        var cattrs = m.ReadAssemblyAttributes ();
        if (cattrs == null)
          continue;

        module.OptAttributes.AddAttributes (cattrs);
      }
    }

    public void Resolve ()
    {
      if (Compiler.Settings.Unsafe && module.PredefinedTypes.SecurityAction.Define ()) {
        //
        // Emits [assembly: SecurityPermissionAttribute (SecurityAction.RequestMinimum, SkipVerification = true)]
        // when -unsafe option was specified
        //
        Location loc = Location.Null;

        MemberAccess system_security_permissions = new MemberAccess (new MemberAccess (
          new QualifiedAliasMember (QualifiedAliasMember.GlobalAlias, "System", loc), "Security", loc), "Permissions", loc);

        var req_min = module.PredefinedMembers.SecurityActionRequestMinimum.Resolve (loc);

        Arguments pos = new Arguments (1);
        pos.Add (new Argument (req_min.GetConstant (null)));

        Arguments named = new Arguments (1);
        named.Add (new NamedArgument ("SkipVerification", loc, new BoolLiteral (Compiler.BuiltinTypes, true, loc)));

        Attribute g = new Attribute ("assembly",
          new MemberAccess (system_security_permissions, "SecurityPermissionAttribute"),
          new Arguments[] { pos, named }, loc, false);
        g.AttachTo (module, module);

        // Disable no-location warnings (e.g. obsolete) for compiler generated attribute
        Compiler.Report.DisableReporting ();
        try {
          var ctor = g.Resolve ();
          if (ctor != null) {
            g.ExtractSecurityPermissionSet (ctor, ref declarative_security);
          }
        } finally {
          Compiler.Report.EnableReporting ();
        }
      }

      if (module.OptAttributes == null)
        return;

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

      cls_attribute = module.ResolveAssemblyAttribute (module.PredefinedAttributes.CLSCompliant);

      if (cls_attribute != null) {
        is_cls_compliant = cls_attribute.GetClsCompliantAttributeValue ();
      }

      if (added_modules != null && Compiler.Settings.VerifyClsCompliance && is_cls_compliant) {
        foreach (var m in added_modules) {
          if (!m.IsCLSCompliant) {
            Report.Error (3013,
              "Added modules must be marked with the CLSCompliant attribute to match the assembly",
              m.Name);
          }
        }
      }

      Attribute a = module.ResolveAssemblyAttribute (module.PredefinedAttributes.RuntimeCompatibility);
      if (a != null) {
        var val = a.GetNamedValue ("WrapNonExceptionThrows") as BoolConstant;
        if (val != null)
          wrap_non_exception_throws = val.Value;
      }
    }

    protected void ResolveAssemblySecurityAttributes ()
    {
      string key_file = null;
      string key_container = null;

      if (module.OptAttributes != null) {
        foreach (Attribute a in module.OptAttributes.Attrs) {
          // cannot rely on any resolve-based members before you call Resolve
          if (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 (Compiler.Settings.StrongNameKeyFile != null) {
              Report.SymbolRelatedToPreviousError (a.Location, a.GetSignatureForError ());
              Report.Warning (1616, 1, "Option `{0}' overrides attribute `{1}' given in a source file or added module",
                  "keyfile", "System.Reflection.AssemblyKeyFileAttribute");
            } else {
              string value = a.GetString ();
              if (!string.IsNullOrEmpty (value)) {
                Error_ObsoleteSecurityAttribute (a, "keyfile");
                key_file = value;
              }
            }
            break;
          case "AssemblyKeyName":
          case "AssemblyKeyNameAttribute":
          case "System.Reflection.AssemblyKeyNameAttribute":
            if (Compiler.Settings.StrongNameKeyContainer != null) {
              Report.SymbolRelatedToPreviousError (a.Location, a.GetSignatureForError ());
              Report.Warning (1616, 1, "Option `{0}' overrides attribute `{1}' given in a source file or added module",
                  "keycontainer", "System.Reflection.AssemblyKeyNameAttribute");
            } else {
              string value = a.GetString ();
              if (!string.IsNullOrEmpty (value)) {
                Error_ObsoleteSecurityAttribute (a, "keycontainer");
                key_container = value;
              }
            }
            break;
          case "AssemblyDelaySign":
          case "AssemblyDelaySignAttribute":
          case "System.Reflection.AssemblyDelaySignAttribute":
            bool b = a.GetBoolean ();
            if (b) {
              Error_ObsoleteSecurityAttribute (a, "delaysign");
            }

            delay_sign = b;
            break;
          }
        }
      }

      // We came here only to report assembly attributes warnings
      if (public_key != null)
        return;

      //
      // Load the strong key file found in attributes when no
      // command line key was given
      //
      if (key_file != null || key_container != null) {
        LoadPublicKey (key_file, key_container);
      } else if (delay_sign) {
        Report.Warning (1607, 1, "Delay signing was requested but no key file was given");
      }
    }

    public void EmbedResources ()
    {
      //
      // Add Win32 resources
      //
      if (Compiler.Settings.Win32ResourceFile != null) {
        Builder.DefineUnmanagedResource (Compiler.Settings.Win32ResourceFile);
      } else {
        Builder.DefineVersionInfoResource (vi_product, vi_product_version, vi_company, vi_copyright, vi_trademark);
      }

      if (Compiler.Settings.Win32IconFile != null) {
        builder_extra.DefineWin32IconResource (Compiler.Settings.Win32IconFile);
      }

      if (Compiler.Settings.Resources != null) {
        if (Compiler.Settings.Target == Target.Module) {
          Report.Error (1507, "Cannot link resource file when building a module");
        } else {
          int counter = 0;
          foreach (var res in Compiler.Settings.Resources) {
            if (!File.Exists (res.FileName)) {
              Report.Error (1566, "Error reading resource file `{0}'", res.FileName);
              continue;
            }

            if (res.IsEmbeded) {
              Stream stream;
              if (counter++ < 10) {
                stream = File.OpenRead (res.FileName);
              } else {
                // TODO: SRE API requires resource stream to be available during AssemblyBuilder::Save
                // we workaround it by reading everything into memory to compile projects with
                // many embedded resource (over 3500) references
                stream = new MemoryStream (File.ReadAllBytes (res.FileName));
              }

              module.Builder.DefineManifestResource (res.Name, stream, res.Attributes);
            } else {
              Builder.AddResourceFile (res.Name, Path.GetFileName (res.FileName), res.Attributes);
            }
          }
        }
      }
    }

    public void Save ()
    {
      PortableExecutableKinds pekind = PortableExecutableKinds.ILOnly;
      ImageFileMachine machine;

      switch (Compiler.Settings.Platform) {
      case Platform.X86:
        pekind |= PortableExecutableKinds.Required32Bit;
        machine = ImageFileMachine.I386;
        break;
      case Platform.X64:
        pekind |= PortableExecutableKinds.PE32Plus;
        machine = ImageFileMachine.AMD64;
        break;
      case Platform.IA64:
        machine = ImageFileMachine.IA64;
        break;
      case Platform.AnyCPU32Preferred:
#if STATIC
        pekind |= PortableExecutableKinds.Preferred32Bit;
        machine = ImageFileMachine.I386;
        break;
#else
        throw new NotSupportedException ();
#endif
      case Platform.Arm:
#if STATIC
        machine = ImageFileMachine.ARM;
        break;
#else
        throw new NotSupportedException ();
#endif
      case Platform.AnyCPU:
      default:
        machine = ImageFileMachine.I386;
        break;
      }

      Compiler.TimeReporter.Start (TimeReporter.TimerType.OutputSave);
      try {
        if (Compiler.Settings.Target == Target.Module) {
          SaveModule (pekind, machine);
        } else {
          Builder.Save (module.Builder.ScopeName, pekind, machine);
        }
      } catch (Exception e) {
        Report.Error (16, "Could not write to file `" + name + "', cause: " + e.Message);
      }
      Compiler.TimeReporter.Stop (TimeReporter.TimerType.OutputSave);

      // Save debug symbols file
      if (symbol_writer != null && Compiler.Report.Errors == 0) {
        // TODO: it should run in parallel
        Compiler.TimeReporter.Start (TimeReporter.TimerType.DebugSave);

        var filename = file_name + ".mdb";
        try {
          // We mmap the file, so unlink the previous version since it may be in use
          File.Delete (filename);
        } catch {
          // We can safely ignore
        }

        module.WriteDebugSymbol (symbol_writer);

        using (FileStream fs = new FileStream (filename, FileMode.Create, FileAccess.Write)) {
          symbol_writer.CreateSymbolFile (module.Builder.ModuleVersionId, fs);
        }

        Compiler.TimeReporter.Stop (TimeReporter.TimerType.DebugSave);
      }
    }

    protected virtual void SaveModule (PortableExecutableKinds pekind, ImageFileMachine machine)
    {
      Report.RuntimeMissingSupport (Location.Null, "-target:module");
    }

    void SetCustomAttribute (MethodSpec ctor, byte[] data)
    {
      if (module_target_attrs != null)
        module_target_attrs.AddAssemblyAttribute (ctor, data);
      else
        Builder.SetCustomAttribute ((ConstructorInfo) ctor.GetMetaInfo (), data);
    }

    void SetEntryPoint ()
    {
      if (!Compiler.Settings.NeedsEntryPoint) {
        if (Compiler.Settings.MainClass != null)
          Report.Error (2017, "Cannot specify -main if building a module or library");

        return;
      }

      PEFileKinds file_kind;

      switch (Compiler.Settings.Target) {
      case Target.Library:
      case Target.Module:
        file_kind = PEFileKinds.Dll;
        break;
      case Target.WinExe:
        file_kind = PEFileKinds.WindowApplication;
        break;
      default:
        file_kind = PEFileKinds.ConsoleApplication;
        break;
      }

      if (entry_point == null) {
        string main_class = Compiler.Settings.MainClass;
        if (main_class != null) {
          // TODO: Handle dotted names
          var texpr = module.GlobalRootNamespace.LookupType (module, main_class, 0, LookupMode.Probing, Location.Null);
          if (texpr == null) {
            Report.Error (1555, "Could not find `{0}' specified for Main method", main_class);
            return;
          }

          var mtype = texpr.MemberDefinition as ClassOrStruct;
          if (mtype == null) {
            Report.Error (1556, "`{0}' specified for Main method must be a valid class or struct", main_class);
            return;
          }

          Report.Error (1558, mtype.Location, "`{0}' does not have a suitable static Main method", mtype.GetSignatureForError ());
        } else {
          string pname = file_name == null ? name : Path.GetFileName (file_name);
          Report.Error (5001, "Program `{0}' does not contain a static `Main' method suitable for an entry point",
            pname);
        }

        return;
      }

      Builder.SetEntryPoint (entry_point.MethodBuilder, file_kind);
    }

    void Error_ObsoleteSecurityAttribute (Attribute a, string option)
    {
      Report.Warning (1699, 1, a.Location,
        "Use compiler option `{0}' or appropriate project settings instead of `{1}' attribute",
        option, a.Name);
    }

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

    public bool IsFriendAssemblyTo (IAssemblyDefinition assembly)
    {
      return false;
    }

    static Version IsValidAssemblyVersion (string version, bool allowGenerated)
    {
      string[] parts = version.Split ('.');
      if (parts.Length < 1 || parts.Length > 4)
        return null;

      var values = new int[4];
      for (int i = 0; i < parts.Length; ++i) {
        if (!int.TryParse (parts[i], out values[i])) {
          if (parts[i].Length == 1 && parts[i][0] == '*' && allowGenerated) {
            if (i == 2) {
              // Nothing can follow *
              if (parts.Length > 3)
                return null;

              // Generate Build value based on days since 1/1/2000
              TimeSpan days = DateTime.Today - new DateTime (2000, 1, 1);
              values[i] = System.Math.Max (days.Days, 0);
              i = 3;
            }

            if (i == 3) {
              // Generate Revision value based on every other second today
              var seconds = DateTime.Now - DateTime.Today;
              values[i] = (int) seconds.TotalSeconds / 2;
              continue;
            }
          }

          return null;
        }

        if (values[i] > ushort.MaxValue)
          return null;
      }

      return new Version (values[0], values[1], values[2], values[3]);
    }
  }

  public class AssemblyResource : IEquatable<AssemblyResource>
  {
    public AssemblyResource (string fileName, string name)
      : this (fileName, name, false)
    {
    }

    public AssemblyResource (string fileName, string name, bool isPrivate)
    {
      FileName = fileName;
      Name = name;
      Attributes = isPrivate ? ResourceAttributes.Private : ResourceAttributes.Public;
    }

    public ResourceAttributes Attributes { get; private set; }
    public string Name { get; private set; }
    public string FileName { get; private set; }
    public bool IsEmbeded { get; set; }

    #region IEquatable<AssemblyResource> Members

    public bool Equals (AssemblyResource other)
    {
      return Name == other.Name;
    }

    #endregion
  }

  //
  // A placeholder class for assembly attributes when emitting module
  //
  class AssemblyAttributesPlaceholder : CompilerGeneratedContainer
  {
    static readonly string TypeNamePrefix = "<$AssemblyAttributes${0}>";
    public static readonly string AssemblyFieldName = "attributes";

    Field assembly;

    public AssemblyAttributesPlaceholder (ModuleContainer parent, string outputName)
      : base (parent, new MemberName (GetGeneratedName (outputName)), Modifiers.STATIC | Modifiers.INTERNAL)
    {
      assembly = new Field (this, new TypeExpression (parent.Compiler.BuiltinTypes.Object, Location), Modifiers.PUBLIC | Modifiers.STATIC,
        new MemberName (AssemblyFieldName), null);

      AddField (assembly);
    }

    public void AddAssemblyAttribute (MethodSpec ctor, byte[] data)
    {
      assembly.SetCustomAttribute (ctor, data);
    }

    public static string GetGeneratedName (string outputName)
    {
      return string.Format (TypeNamePrefix, outputName);
    }
  }

  //
  // Extension to System.Reflection.Emit.AssemblyBuilder to have fully compatible
  // compiler. This is a default implementation for framework System.Reflection.Emit
  // which does not implement any of the methods
  //
  public class AssemblyBuilderExtension
  {
    readonly CompilerContext ctx;

    public AssemblyBuilderExtension (CompilerContext ctx)
    {
      this.ctx = ctx;
    }

    public virtual System.Reflection.Module AddModule (string module)
    {
      ctx.Report.RuntimeMissingSupport (Location.Null, "-addmodule");
      return null;
    }

    public virtual void AddPermissionRequests (PermissionSet[] permissions)
    {
      ctx.Report.RuntimeMissingSupport (Location.Null, "assembly declarative security");
    }

    public virtual void AddTypeForwarder (TypeSpec type, Location loc)
    {
      ctx.Report.RuntimeMissingSupport (loc, "TypeForwardedToAttribute");
    }

    public virtual void DefineWin32IconResource (string fileName)
    {
      ctx.Report.RuntimeMissingSupport (Location.Null, "-win32icon");
    }

    public virtual void SetAlgorithmId (uint value, Location loc)
    {
      ctx.Report.RuntimeMissingSupport (loc, "AssemblyAlgorithmIdAttribute");
    }

    public virtual void SetCulture (string culture, Location loc)
    {
      ctx.Report.RuntimeMissingSupport (loc, "AssemblyCultureAttribute");
    }

    public virtual void SetFlags (uint flags, Location loc)
    {
      ctx.Report.RuntimeMissingSupport (loc, "AssemblyFlagsAttribute");
    }

    public virtual void SetVersion (Version version, Location loc)
    {
      ctx.Report.RuntimeMissingSupport (loc, "AssemblyVersionAttribute");
    }
  }

  abstract class AssemblyReferencesLoader<T> where T : class
  {
    protected readonly CompilerContext compiler;

    protected readonly List<string> paths;

    protected AssemblyReferencesLoader (CompilerContext compiler)
    {
      this.compiler = compiler;

      paths = new List<string> ();
      paths.Add (Directory.GetCurrentDirectory ());
      paths.AddRange (compiler.Settings.ReferencesLookupPaths);
    }

    public abstract bool HasObjectType (T assembly);
    protected abstract string[] GetDefaultReferences ();
    public abstract T LoadAssemblyFile (string fileName, bool isImplicitReference);
    public abstract void LoadReferences (ModuleContainer module);

    protected void Error_FileNotFound (string fileName)
    {
      compiler.Report.Error (6, "Metadata file `{0}' could not be found", fileName);
    }

    protected void Error_FileCorrupted (string fileName)
    {
      compiler.Report.Error (9, "Metadata file `{0}' does not contain valid metadata", fileName);
    }

    protected void Error_AssemblyIsModule (string fileName)
    {
      compiler.Report.Error (1509,
        "Referenced assembly file `{0}' is a module. Consider using `-addmodule' option to add the module",
        fileName);
    }

    protected void Error_ModuleIsAssembly (string fileName)
    {
      compiler.Report.Error (1542,
        "Added module file `{0}' is an assembly. Consider using `-r' option to reference the file",
        fileName);
    }

    protected void LoadReferencesCore (ModuleContainer module, out T corlib_assembly, out List<Tuple<RootNamespace, T>> loaded)
    {
      compiler.TimeReporter.Start (TimeReporter.TimerType.ReferencesLoading);

      loaded = new List<Tuple<RootNamespace, T>> ();

      //
      // Load mscorlib.dll as the first
      //
      if (module.Compiler.Settings.StdLib) {
        corlib_assembly = LoadAssemblyFile ("mscorlib.dll", true);
      } else {
        corlib_assembly = default (T);
      }

      T a;
      foreach (string r in module.Compiler.Settings.AssemblyReferences) {
        a = LoadAssemblyFile (r, false);
        if (a == null || EqualityComparer<T>.Default.Equals (a, corlib_assembly))
          continue;

        var key = Tuple.Create (module.GlobalRootNamespace, a);
        if (loaded.Contains (key))
          continue;

        loaded.Add (key);
      }

      if (corlib_assembly == null) {
        //
        // Requires second pass because HasObjectType can trigger assembly load event
        //
        for (int i = 0; i < loaded.Count; ++i) {
          var assembly = loaded [i];

          //
          // corlib assembly is the first referenced assembly which contains System.Object
          //
          if (HasObjectType (assembly.Item2)) {
            corlib_assembly = assembly.Item2;
            loaded.RemoveAt (i);
            break;
          }
        }
      }

      foreach (var entry in module.Compiler.Settings.AssemblyReferencesAliases) {
        a = LoadAssemblyFile (entry.Item2, false);
        if (a == null)
          continue;

        var key = Tuple.Create (module.CreateRootNamespace (entry.Item1), a);
        if (loaded.Contains (key))
          continue;

        loaded.Add (key);
      }

      if (compiler.Settings.LoadDefaultReferences) {
        foreach (string r in GetDefaultReferences ()) {
          a = LoadAssemblyFile (r, true);
          if (a == null)
            continue;

          var key = Tuple.Create (module.GlobalRootNamespace, a);
          if (loaded.Contains (key))
            continue;

          loaded.Add (key);
        }
      }

      compiler.TimeReporter.Stop (TimeReporter.TimerType.ReferencesLoading);
    }
  }
}