public static void DoPass(RewriteGlobalContext context, UnhollowerOptions options)
{
if (string.IsNullOrEmpty(options.GameAssemblyPath))
{
Pass15GenerateMemberContexts.HasObfuscatedMethods = false;
return;
}
using var mappedFile = MemoryMappedFile.CreateFromFile(options.GameAssemblyPath, FileMode.Open, null, 0, MemoryMappedFileAccess.Read);
using var accessor = mappedFile.CreateViewAccessor(0, 0, MemoryMappedFileAccess.Read);
IntPtr gameAssemblyPtr;
unsafe
{
byte *fileStartPtr = null;
accessor.SafeMemoryMappedViewHandle.AcquirePointer(ref fileStartPtr);
gameAssemblyPtr = (IntPtr)fileStartPtr;
}
context.HasGcWbarrierFieldWrite = FindByteSequence(gameAssemblyPtr, accessor.Capacity, nameof(IL2CPP.il2cpp_gc_wbarrier_set_field));
if (!Pass15GenerateMemberContexts.HasObfuscatedMethods)
{
return;
}
var methodToCallersMap = new ConcurrentDictionary <long, List <XrefInstance> >();
var methodToCalleesMap = new ConcurrentDictionary <long, List <long> >();
context.MethodStartAddresses.Sort();
// Scan xrefs
context.Assemblies.SelectMany(it => it.Types).SelectMany(it => it.Methods).AsParallel().ForAll(
originalTypeMethod =>
{
var address = originalTypeMethod.FileOffset;
if (address == 0)
{
return;
}
if (!options.NoXrefCache)
{
var pair = XrefScanMetadataGenerationUtil.FindMetadataInitForMethod(originalTypeMethod, (long)gameAssemblyPtr);
originalTypeMethod.MetadataInitFlagRva = pair.FlagRva;
originalTypeMethod.MetadataInitTokenRva = pair.TokenRva;
}
var nextMethodStart = context.MethodStartAddresses.BinarySearch(address + 1);
if (nextMethodStart < 0)
{
nextMethodStart = ~nextMethodStart;
}
var length = nextMethodStart >= context.MethodStartAddresses.Count ? 1024 * 1024 : (context.MethodStartAddresses[nextMethodStart] - address);
foreach (var callTargetGlobal in XrefScanner.XrefScanImpl(XrefScanner.DecoderForAddress(IntPtr.Add(gameAssemblyPtr, (int)address), (int)length), true))
{
var callTarget = callTargetGlobal.RelativeToBase((long)gameAssemblyPtr + originalTypeMethod.FileOffset - originalTypeMethod.Rva);
if (callTarget.Type == XrefType.Method)
{
var targetRelative = (long)callTarget.Pointer;
methodToCallersMap.GetOrAdd(targetRelative, _ => new List <XrefInstance>()).AddLocked(new XrefInstance(XrefType.Method, (IntPtr)originalTypeMethod.Rva, callTarget.FoundAt));
methodToCalleesMap.GetOrAdd(originalTypeMethod.Rva, _ => new List <long>()).AddLocked(targetRelative);
}
if (!options.NoXrefCache)
{
originalTypeMethod.XrefScanResults.Add(callTarget);
}
}
});
MapOfCallers = methodToCallersMap;
void MarkMethodAlive(long address)
{
if (!NonDeadMethods.Add(address))
{
return;
}
if (!methodToCalleesMap.TryGetValue(address, out var calleeList))
{
return;
}
foreach (var callee in calleeList)
{
MarkMethodAlive(callee);
}
}
// Now decided which of them are possible dead code
foreach (var assemblyRewriteContext in context.Assemblies)
{
foreach (var typeRewriteContext in assemblyRewriteContext.Types)
{
foreach (var methodRewriteContext in typeRewriteContext.Methods)
{
if (methodRewriteContext.FileOffset == 0)
{
continue;
}
var originalMethod = methodRewriteContext.OriginalMethod;
if (!originalMethod.Name.IsObfuscated(options) || originalMethod.IsVirtual)
{
MarkMethodAlive(methodRewriteContext.Rva);
}
}
}
}
}