chizui/Il2CppInspectorRedux
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Move index decoding to MetadataUsage

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This reduces code duplication between metadata usage index decoding and
vtable method index decoding.
This commit is contained in:
Robert Xiao
2020-06-16 20:02:44 -07:00
committed by Katy
parent d426dad820
commit 5d57b76735
2 changed files with 24 additions and 26 deletions
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29
Il2CppInspector.Common/IL2CPP/Il2CppInspector.cs
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@@ -134,14 +134,7 @@ namespace Il2CppInspector
for (var i = 0; i < metadataUsageList.count; i++)
{
var metadataUsagePair = Metadata.MetadataUsagePairs[metadataUsageList.start + i];
var encodedType = metadataUsagePair.encodedSourceIndex & 0xE0000000;
var usageType = (MetadataUsageType)(encodedType >> 29);
var sourceIndex = metadataUsagePair.encodedSourceIndex & 0x1FFFFFFF;
var destinationIndex = metadataUsagePair.destinationindex;
usages.TryAdd(destinationIndex, new MetadataUsage(usageType, (int)sourceIndex, (int)destinationIndex));
usages.TryAdd(metadataUsagePair.destinationindex, MetadataUsage.FromEncodedIndex(this, metadataUsagePair.encodedSourceIndex));
}
}
@@ -149,8 +142,8 @@ namespace Il2CppInspector
// Unfortunately the value supplied in MetadataRegistration.matadataUsagesCount seems to be incorrect,
// so we have to calculate the correct number of usages above before reading the usage address list from the binary
var addresses = Binary.Image.ReadMappedArray<ulong>(Binary.MetadataRegistration.metadataUsages, usages.Count);
foreach (var usage in usages.Values)
usage.SetAddress(addresses[usage.DestinationIndex]);
foreach (var usage in usages)
usage.Value.SetAddress(addresses[usage.Key]);
return usages.Values.ToList();
}
@@ -298,19 +291,9 @@ namespace Il2CppInspector
MetadataUsage[] res = new MetadataUsage[definition.vtable_count];
for (int i = 0; i < definition.vtable_count; i++) {
var encodedIndex = VTableMethodIndices[definition.vtableStart + i];
uint index;
MetadataUsageType usageType;
if (Version < 19) {
var flag = encodedIndex & 0x80000000;
index = Binary.VTableMethodReferences[encodedIndex & 0x7FFFFFFF];
usageType = (flag != 0) ? MetadataUsageType.MethodRef : MetadataUsageType.MethodDef;
} else {
var encodedType = encodedIndex & 0xE0000000;
usageType = (MetadataUsageType)(encodedType >> 29);
index = encodedIndex & 0x1FFFFFFF;
}
if (index != 0)
res[i] = new MetadataUsage(usageType, (int)index, i);
MetadataUsage usage = MetadataUsage.FromEncodedIndex(this, encodedIndex);
if (usage.SourceIndex != 0)
res[i] = usage;
}
return res;
}

21
Il2CppInspector.Common/IL2CPP/MetadataUsage.cs
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@@ -21,13 +21,28 @@ namespace Il2CppInspector
{
public MetadataUsageType Type { get; }
public int SourceIndex { get; }
public int DestinationIndex { get; }
public ulong VirtualAddress { get; private set; }
public MetadataUsage(MetadataUsageType type, int sourceIndex, int destinationIndex) {
public MetadataUsage(MetadataUsageType type, int sourceIndex) {
Type = type;
SourceIndex = sourceIndex;
DestinationIndex = destinationIndex;
}
public static MetadataUsage FromEncodedIndex(Il2CppInspector package, uint encodedIndex) {
uint index;
MetadataUsageType usageType;
if (package.Version < 19) {
/* These encoded indices appear only in vtables, and are decoded by IsGenericMethodIndex/GetDecodedMethodIndex */
var isGeneric = encodedIndex & 0x80000000;
index = package.Binary.VTableMethodReferences[encodedIndex & 0x7FFFFFFF];
usageType = (isGeneric != 0) ? MetadataUsageType.MethodRef : MetadataUsageType.MethodDef;
} else {
/* These encoded indices appear in metadata usages, and are decoded by GetEncodedIndexType/GetDecodedMethodIndex */
var encodedType = encodedIndex & 0xE0000000;
usageType = (MetadataUsageType)(encodedType >> 29);
index = encodedIndex & 0x1FFFFFFF;
}
return new MetadataUsage(usageType, (int)index);
}
public void SetAddress(ulong virtualAddress) => VirtualAddress = virtualAddress;