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IL2CPP: Implement metadata usages for metadata v27

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This commit is contained in:
Katy Coe
2020-08-16 04:18:17 +02:00
parent 5f7218f7df
commit 246809c0a4
2 changed files with 57 additions and 5 deletions
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55
Il2CppInspector.Common/IL2CPP/Il2CppInspector.cs
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@@ -158,8 +158,59 @@ namespace Il2CppInspector
return usages.Values.ToList();
}
public List<MetadataUsage> buildLateBindingMetadataUsages() {
// TODO: Resolve late binding for metadata v27
public List<MetadataUsage> buildLateBindingMetadataUsages()
{
// plagiarism. noun - https://www.lexico.com/en/definition/plagiarism
// the practice of taking someone else's work or ideas and passing them off as one's own.
// Synonyms: copying, piracy, theft, strealing, infringement of copyright
BinaryImage.Position = 0;
var sequenceLength = 0;
var threshold = 6000; // current versions of mscorlib generate about 6000-7000 metadata usages
var usagesCount = 0;
// Scan the image looking for a sequential block of at least 'threshold' valid metadata tokens
while (BinaryImage.Position < BinaryImage.Length && (usagesCount == 0 || sequenceLength > 0)) {
var word = BinaryImage.ReadWord();
if (word % 2 != 1 || word >> 32 != 0) {
sequenceLength = 0;
continue;
}
var potentialUsage = MetadataUsage.FromEncodedIndex(this, (uint) word);
switch (potentialUsage.Type) {
case MetadataUsageType.Type:
case MetadataUsageType.TypeInfo:
case MetadataUsageType.MethodDef:
case MetadataUsageType.MethodRef:
case MetadataUsageType.FieldInfo:
case MetadataUsageType.StringLiteral:
sequenceLength++;
if (sequenceLength >= threshold)
usagesCount = sequenceLength;
break;
default:
sequenceLength = 0;
break;
}
}
// If we found a block, read all the tokens and map them with their VAs to MetadataUsage objects
if (usagesCount > 0) {
var wordSize = BinaryImage.Bits / 8;
var pMetadataUsages = (uint) (BinaryImage.Position - (usagesCount + 1) * wordSize);
var pMetadataUsagesVA = BinaryImage.MapFileOffsetToVA(pMetadataUsages);
var usageTokens = BinaryImage.ReadWordArray(pMetadataUsages, usagesCount);
var usages = usageTokens.Zip(Enumerable.Range(0, usagesCount)
.Select(a => pMetadataUsagesVA + (ulong) (a * wordSize)), (t, a) => MetadataUsage.FromEncodedIndex(this, (uint) t, a));
Console.WriteLine("Late binding metadata usage block found successfully for metadata v27");
return usages.ToList();
}
Console.WriteLine("Late binding metadata usage block could not be auto-detected - metadata usage references will not be available for this project");
return null;
}

7
Il2CppInspector.Common/IL2CPP/MetadataUsage.cs
View File

@@ -24,12 +24,13 @@ namespace Il2CppInspector
public int SourceIndex { get; }
public ulong VirtualAddress { get; private set; }
public MetadataUsage(MetadataUsageType type, int sourceIndex) {
public MetadataUsage(MetadataUsageType type, int sourceIndex, ulong virtualAddress = 0) {
Type = type;
SourceIndex = sourceIndex;
VirtualAddress = virtualAddress;
}
public static MetadataUsage FromEncodedIndex(Il2CppInspector package, uint encodedIndex) {
public static MetadataUsage FromEncodedIndex(Il2CppInspector package, uint encodedIndex, ulong virtualAddress = 0) {
uint index;
MetadataUsageType usageType;
if (package.Version < 19) {
@@ -47,7 +48,7 @@ namespace Il2CppInspector
if (package.Version >= 27)
index >>= 1;
}
return new MetadataUsage(usageType, (int)index);
return new MetadataUsage(usageType, (int)index, virtualAddress);
}
public void SetAddress(ulong virtualAddress) => VirtualAddress = virtualAddress;