Added ikvmc -highentropyva option (to enable high entropy ASLR in 64 bit processes on Windows 8).

ikvmc/Compiler.cs

@@ -347,6 +347,7 @@ class IkvmcCompiler
 		Console.Error.WriteLine("    -nostdlib                  Do not reference standard libraries");
 		Console.Error.WriteLine("    -lib:<dir>                 Additional directories to search for references");
 		Console.Error.WriteLine("    -noautoserialization       Disable automatic .NET serialization support");
+		Console.Error.WriteLine("    -highentropyva             Enable high entropy ASLR");
 	}
 
 	int ParseCommandLine(IEnumerator<string> arglist, List<CompilerOptions> targets, CompilerOptions options)
@@ -803,6 +804,10 @@ class IkvmcCompiler
 				{
 					options.codegenoptions |= CodeGenOptions.NoAutomagicSerialization;
 				}
+				else if(s == "-highentropyva")
+				{
+					options.highentropyva = true;
+				}
 				else if(s.StartsWith("-writeSuppressWarningsFile:"))
 				{
 					options.writeSuppressWarningsFile = s.Substring(27);

ikvmc/CompilerClassLoader.cs

@@ -174,6 +174,10 @@ namespace IKVM.Internal
 			{
 				moduleBuilder.__FileAlignment = options.fileAlignment;
 			}
+			if(options.highentropyva)
+			{
+				moduleBuilder.__DllCharacteristics |= DllCharacteristics.HighEntropyVA;
+			}
 			return moduleBuilder;
 		}
 
@@ -3403,6 +3407,7 @@ namespace IKVM.Internal
 		internal ImageFileMachine imageFileMachine = ImageFileMachine.I386;
 		internal long baseAddress;
 		internal int fileAlignment;
+		internal bool highentropyva;
 		internal List<CompilerClassLoader> sharedclassloader; // should *not* be deep copied in Copy(), because we want the list of all compilers that share a class loader
 		internal Dictionary<string, string> suppressWarnings = new Dictionary<string, string>();
 		internal Dictionary<string, string> errorWarnings = new Dictionary<string, string>();	// treat specific warnings as errors