/// <summary>
/// Creates a reference to a loaded assembly.
/// </summary>
/// <param name="assembly">Path to the module file.</param>
/// <param name="properties">Reference properties (extern aliases, type embedding).</param>
/// <param name="documentation">Provides XML documentation for symbol found in the reference.</param>
/// <exception cref="ArgumentNullException"><paramref name="assembly"/> is null.</exception>
/// <exception cref="ArgumentException"><paramref name="properties"/>.<see cref="MetadataReferenceProperties.Kind"/> is not <see cref="MetadataImageKind.Assembly"/>.</exception>
/// <exception cref="NotSupportedException"><paramref name="assembly"/> is dynamic, doesn't have a location, or the platform doesn't support reading from the location.</exception>
/// <remarks>
/// Performance considerations:
/// <para>
/// It is recommended to use <see cref="AssemblyMetadata.CreateFromFile(string)"/> API when creating multiple references to the same assembly.
/// Reusing <see cref="AssemblyMetadata"/> object allows for sharing data accross these references.
/// </para>
/// </remarks>
public static MetadataReference CreateFromAssembly(
Assembly assembly,
MetadataReferenceProperties properties,
DocumentationProvider documentation = null)
{
// Note: returns MetadataReference and not PortableExecutableReference so that we can in future support assemblies that
// which are not backed by PE image.
if (assembly == null)
{
throw new ArgumentNullException(nameof(assembly));
}
if (assembly.IsDynamic)
{
throw new NotSupportedException(CodeAnalysisResources.CantCreateReferenceToDynamicAssembly);
}
if (properties.Kind != MetadataImageKind.Assembly)
{
throw new ArgumentException(CodeAnalysisResources.CantCreateModuleReferenceToAssembly, nameof(properties));
}
string location = AssemblyLocationLightUp.GetAssemblyLocation(assembly);
Stream peStream = FileStreamLightUp.OpenFileStream(location);
// The file is locked by the CLR assembly loader, so we can create a lazily read metadata,
// which migth also lock the file until the reference is GC'd.
var metadata = AssemblyMetadata.CreateFromStream(peStream);
return(metadata.GetReference(filePath: location));
}
/// <summary>
/// Creates a reference to an assembly or standalone module stored in a file.
/// Reads the content of the file into memory.
/// </summary>
/// <param name="path">Path to the assembly file.</param>
/// <param name="properties">Reference properties (extern aliases, type embedding, <see cref="MetadataImageKind"/>).</param>
/// <param name="documentation">Provides XML documentation for symbol found in the reference.</param>
/// <exception cref="ArgumentNullException"><paramref name="path"/> is null.</exception>
/// <exception cref="ArgumentException"><paramref name="path"/> is invalid.</exception>
/// <exception cref="IOException">An error occurred while reading the file.</exception>
/// <remarks>
/// Performance considerations:
/// <para>
/// It is recommended to use <see cref="AssemblyMetadata.CreateFromFile(string)"/> or <see cref="ModuleMetadata.CreateFromFile(string)"/>
/// API when creating multiple references to the same file.
/// Reusing <see cref="Metadata"/> object allows for sharing data accross these references.
/// </para>
/// <para>
/// The method eagerly reads the entire content of the file into native heap. The native memory block is released
/// when the resulting reference becomes unreachable and GC collects it. To decrease memory footprint of the reference and/or manage
/// the lifetime deterministically use <see cref="AssemblyMetadata.CreateFromFile(string)"/>
/// to create an <see cref="IDisposable"/> metadata object and
/// <see cref="AssemblyMetadata.GetReference(DocumentationProvider, ImmutableArray{string}, bool, string, string)"/>
/// to get a reference to it.
/// </para>
/// </remarks>
public static PortableExecutableReference CreateFromFile(
string path,
MetadataReferenceProperties properties = default(MetadataReferenceProperties),
DocumentationProvider documentation = null)
{
var peStream = FileStreamLightUp.OpenFileStream(path);
// prefetch image, close stream to avoid locking it:
var module = ModuleMetadata.CreateFromStream(peStream, PEStreamOptions.PrefetchEntireImage);
if (properties.Kind == MetadataImageKind.Module)
{
return(module.GetReference(documentation, path));
}
// any additional modules constituting the assembly will be read lazily:
var assemblyMetadata = AssemblyMetadata.CreateFromFile(module, path);
return(assemblyMetadata.GetReference(documentation, properties.Aliases, properties.EmbedInteropTypes, path));
}
/// <summary>
/// Creates metadata module from a file containing a portable executable image.
/// </summary>
/// <param name="path">File path.</param>
/// <remarks>
/// The file might remain mapped (and read-locked) until this object is disposed.
/// The memory map is only created for large files. Small files are read into memory.
/// </remarks>
/// <exception cref="ArgumentNullException"><paramref name="path"/> is null.</exception>
/// <exception cref="ArgumentException"><paramref name="path"/> is invalid.</exception>
/// <exception cref="IOException">Error opening file <paramref name="path"/>. See <see cref="Exception.InnerException"/> for details.</exception>
/// <exception cref="FileNotFoundException">File <paramref name="path"/> not found.</exception>
/// <exception cref="NotSupportedException">Reading from a file path is not supported by the platform.</exception>
public static ModuleMetadata CreateFromFile(string path)
{
return(CreateFromStream(FileStreamLightUp.OpenFileStream(path)));
}