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AssemblyResolver.cs
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using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using IKVM.Reflection;
namespace IronPythonCompiler {
internal class AssemblyResolver {
private Universe _universe;
private readonly List<string> _libpaths = new List<string>();
private Version _mscorlibVersion;
private Dictionary<string, string> _hintpaths = new Dictionary<string, string>();
public AssemblyResolver(Universe universe, bool nostdlib, IEnumerable<string> references, IEnumerable<string> libpaths) {
_universe = universe;
_libpaths.Add(Environment.CurrentDirectory);
_libpaths.AddRange(libpaths);
if (!nostdlib) {
_libpaths.Add(System.Runtime.InteropServices.RuntimeEnvironment.GetRuntimeDirectory());
}
// items passed in via /lib:<path>
foreach (string path in libpaths) {
foreach (string dir in path.Split(new char[] { Path.PathSeparator }, StringSplitOptions.RemoveEmptyEntries)) {
if (Directory.Exists(dir)) {
_libpaths.Add(dir);
} else {
ConsoleOps.Warning("Directory specified ('{0}') by /lib: does not exist", dir);
}
}
}
string envLib = Environment.GetEnvironmentVariable("LIB");
if (!string.IsNullOrEmpty(envLib)) {
foreach (string dir in envLib.Split(new char[] { Path.PathSeparator }, StringSplitOptions.RemoveEmptyEntries)) {
if (Directory.Exists(dir)) {
_libpaths.Add(dir);
} else {
ConsoleOps.Warning("Directory specified ('{0}') in LIB does not exist", dir);
}
}
}
if (nostdlib) {
_mscorlibVersion = LoadMscorlib(references).GetName().Version;
} else {
_mscorlibVersion = universe.Load("mscorlib").GetName().Version;
}
_universe.AssemblyResolve += _universe_AssemblyResolve;
}
private Assembly _universe_AssemblyResolve(object sender, IKVM.Reflection.ResolveEventArgs args) {
AssemblyName name = new AssemblyName(args.Name);
AssemblyName previousMatch = null;
int previousMatchLevel = 0;
foreach (Assembly asm in _universe.GetAssemblies()) {
if (Match(asm.GetName(), name, ref previousMatch, ref previousMatchLevel)) {
return asm;
}
}
foreach (string file in FindAssemblyPath(name.Name + ".dll")) {
if (Match(AssemblyName.GetAssemblyName(file), name, ref previousMatch, ref previousMatchLevel)) {
return LoadFile(file);
}
}
if (args.RequestingAssembly != null) {
string path = Path.Combine(Path.GetDirectoryName(args.RequestingAssembly.Location), name.Name + ".dll");
if (File.Exists(path) && Match(AssemblyName.GetAssemblyName(path), name, ref previousMatch, ref previousMatchLevel)) {
return LoadFile(path);
}
}
string hintpath;
if (_hintpaths.TryGetValue(name.FullName, out hintpath)) {
string path = Path.Combine(hintpath, name.Name + ".dll");
if (File.Exists(path) && Match(AssemblyName.GetAssemblyName(path), name, ref previousMatch, ref previousMatchLevel)) {
return LoadFile(path);
}
}
if (previousMatch != null) {
if (previousMatchLevel == 2) {
ConsoleOps.Warning("assuming assembly reference '{0}' matches '{1}', you may need to supply runtime policy", previousMatch.FullName, name.FullName);
return LoadFile(new Uri(previousMatch.CodeBase).LocalPath);
} else if (args.RequestingAssembly != null) {
ConsoleOps.Error(true, "Assembly '{0}' uses '{1}' which has a higher version than referenced assembly '{2}'", args.RequestingAssembly.FullName, name.FullName, previousMatch.FullName);
} else {
ConsoleOps.Error(true, "Assembly '{0}' was requested which is a higher version than referenced assembly '{1}'", name.FullName, previousMatch.FullName);
}
} else {
ConsoleOps.Error(true, "unable to find assembly '{0}' {1}", args.Name, args.RequestingAssembly != null ? string.Format(" (a dependency of '{0}')", args.RequestingAssembly.FullName) : string.Empty);
}
return null;
}
private bool Match(AssemblyName assemblyDef, AssemblyName assemblyRef, ref AssemblyName bestMatch, ref int bestMatchLevel) {
// Match levels:
// 0 = no match
// 1 = lower version match (i.e. not a suitable match, but used in error reporting: something was found but the version was too low)
// 2 = higher version potential match (i.e. we can use this version, but if it is available the exact match will be preferred)
//
// If we find a perfect match, bestMatch is not changed but we return true to signal that the search can end right now.
AssemblyComparisonResult result;
_universe.CompareAssemblyIdentity(assemblyRef.FullName, false, assemblyDef.FullName, true, out result);
switch (result) {
case AssemblyComparisonResult.EquivalentFullMatch:
case AssemblyComparisonResult.EquivalentPartialMatch:
case AssemblyComparisonResult.EquivalentFXUnified:
case AssemblyComparisonResult.EquivalentPartialFXUnified:
case AssemblyComparisonResult.EquivalentPartialWeakNamed:
case AssemblyComparisonResult.EquivalentWeakNamed:
return true;
case AssemblyComparisonResult.NonEquivalentPartialVersion:
case AssemblyComparisonResult.NonEquivalentVersion:
if (bestMatchLevel < 1) {
bestMatchLevel = 1;
bestMatch = assemblyDef;
}
return false;
case AssemblyComparisonResult.EquivalentUnified:
case AssemblyComparisonResult.EquivalentPartialUnified:
if (bestMatchLevel < 2) {
bestMatchLevel = 2;
bestMatch = assemblyDef;
}
return false;
case AssemblyComparisonResult.NonEquivalent:
case AssemblyComparisonResult.Unknown:
return false;
default:
throw new NotImplementedException();
}
}
public bool ResolveReference(Dictionary<string, Assembly> cache, List<Assembly> references, string reference) {
string[] files = new string[0];
try {
string path = Path.GetDirectoryName(reference);
files = Directory.GetFiles(path == "" ? "." : path, Path.GetFileName(reference));
} catch (ArgumentException) {
} catch (IOException) {
}
if (files.Length == 0) {
Assembly asm = null;
cache.TryGetValue(reference, out asm);
if (asm == null) {
foreach (string found in FindAssemblyPath(reference)) {
asm = LoadFile(found);
cache.Add(reference, asm);
break;
}
}
if (asm == null) {
Console.Error.WriteLine("Error: reference not found: {0}", reference);
return false;
}
references.Add(asm);
} else {
foreach (string file in files) {
Assembly asm;
if (!cache.TryGetValue(file, out asm)) {
asm = LoadFile(file);
}
references.Add(asm);
}
}
return true;
}
private Assembly LoadMscorlib(IEnumerable<string> references) {
if (references != null) {
foreach (string r in references) {
try {
if (AssemblyName.GetAssemblyName(r).Name == "mscorlib") {
return LoadFile(r);
}
} catch {
}
}
}
foreach (string mscorlib in FindAssemblyPath("mscorlib.dll")) {
return LoadFile(mscorlib);
}
ConsoleOps.Error(true, "unable to find mscorlib.dll");
return null;
}
private void AddHintPath(string assemblyName, string path) {
_hintpaths.Add(assemblyName, path);
}
private IEnumerable<string> FindAssemblyPath(string file) {
if (Path.IsPathRooted(file)) {
if (File.Exists(file)) {
yield return file;
}
} else {
foreach (string dir in _libpaths) {
string path = Path.Combine(dir, file);
if (File.Exists(path)) {
yield return path;
}
// for legacy compat, we try again after appending .dll
path = Path.Combine(dir, file + ".dll");
if (File.Exists(path)) {
ConsoleOps.Warning("Found assembly '{0}' using legacy search rule, please append '.dll' to the reference", file);
yield return path;
}
}
}
}
private Assembly LoadFile(string path) {
string ex = null;
try {
using (RawModule module = _universe.OpenRawModule(path)) {
if (_mscorlibVersion != null) {
// to avoid problems (i.e. weird exceptions), we don't allow assemblies to load that reference a newer version of mscorlib
foreach (AssemblyName asmref in module.GetReferencedAssemblies()) {
if (asmref.Name == "mscorlib" && asmref.Version > _mscorlibVersion) {
ConsoleOps.Error(true, "unable to load assembly '{0}' as it depends on a higher version of mscorlib than the one currently loaded", path);
}
}
}
Assembly asm = _universe.LoadAssembly(module);
if (asm.Location != module.Location && CanonicalizePath(asm.Location) != CanonicalizePath(module.Location)) {
ConsoleOps.Warning("assembly '{0}' is ignored as previously loaded assembly '{1}' has the same identity '{2}'", path, asm.Location, asm.FullName);
}
return asm;
}
} catch (IOException x) {
ex = x.Message;
} catch (UnauthorizedAccessException x) {
ex = x.Message;
} catch (IKVM.Reflection.BadImageFormatException x) {
ex = x.Message;
}
ConsoleOps.Error(true, "unable to load assembly '{0}'" + Environment.NewLine + " ({1})", path, ex);
return null;
}
private static string CanonicalizePath(string path) {
try {
FileInfo fi = new FileInfo(path);
if (fi.DirectoryName == null) {
return path.Length > 1 && path[1] == ':' ? path.ToUpper() : path;
}
string dir = CanonicalizePath(fi.DirectoryName);
string name = fi.Name;
try {
string[] arr = System.IO.Directory.GetFileSystemEntries(dir, name);
if (arr.Length == 1) {
name = arr[0];
}
} catch (UnauthorizedAccessException) {
} catch (IOException) {
}
return Path.Combine(dir, name);
} catch (UnauthorizedAccessException) {
} catch (IOException) {
} catch (System.Security.SecurityException) {
} catch (NotSupportedException) {
}
return path;
}
}
}