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Unity: Try really hard to find the best IL2CPP API header match for the binary

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This commit is contained in:
Katy Coe
2020-07-24 17:01:13 +02:00
parent e0a6c8746e
commit 8bb40d98b2
1 changed files with 52 additions and 10 deletions
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62
Il2CppInspector.Common/Cpp/UnityHeaders/UnityHeaders.cs
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@@ -6,8 +6,6 @@
*/
using System;
using System.Reflection;
using System.IO;
using System.Linq;
using System.Collections.Generic;
using System.Diagnostics;
@@ -27,13 +25,13 @@ namespace Il2CppInspector.Cpp.UnityHeaders
public UnityVersionRange VersionRange { get; }
// The fully qualified names of the embedded resources
private readonly UnityResource typeHeaderResource;
private readonly UnityResource apiHeaderResource;
public UnityResource TypeHeaderResource { get; }
public UnityResource APIHeaderResource { get; }
// Initialize from a type header and an API header
private UnityHeaders(UnityResource typeHeaders, UnityResource apiHeaders) {
typeHeaderResource = typeHeaders;
apiHeaderResource = apiHeaders;
TypeHeaderResource = typeHeaders;
APIHeaderResource = apiHeaders;
VersionRange = typeHeaders.VersionRange.Intersect(apiHeaders.VersionRange);
MetadataVersion = GetMetadataVersionFromFilename(typeHeaders.Name);
@@ -41,7 +39,7 @@ namespace Il2CppInspector.Cpp.UnityHeaders
// Return the contents of the type header file as a string
public string GetTypeHeaderText(int WordSize) {
var str = (WordSize == 32 ? "#define IS_32BIT\n" : "") + typeHeaderResource.GetText();
var str = (WordSize == 32 ? "#define IS_32BIT\n" : "") + TypeHeaderResource.GetText();
// Versions 5.3.6-5.4.6 don't include a definition for VirtualInvokeData
if (VersionRange.Min.CompareTo("5.3.6") >= 0 && VersionRange.Max.CompareTo("5.4.6") <= 0) {
@@ -55,7 +53,7 @@ namespace Il2CppInspector.Cpp.UnityHeaders
}
// Return the contents of the API header file as a string
public string GetAPIHeaderText() => apiHeaderResource.GetText();
public string GetAPIHeaderText() => APIHeaderResource.GetText();
// Return the contents of the API header file translated to typedefs as a string
public string GetAPIHeaderTypedefText() => GetTypedefsFromAPIHeader(GetAPIHeaderText());
@@ -126,8 +124,52 @@ namespace Il2CppInspector.Cpp.UnityHeaders
typeHeaders.Add(r);
}
// TODO: Replace this with an implementation which searches for the correct API header
return typeHeaders.Select(t => new UnityHeaders(t, GetAPIHeaderForVersion(t.VersionRange.Min))).ToList();
// Get total range of selected headers
// Sort is needed because 5.x.x comes before 20xx.x.x in the resource list
typeHeaders = typeHeaders.OrderBy(x => x.VersionRange).ToList();
var totalRange = new UnityVersionRange(typeHeaders.First().VersionRange.Min, typeHeaders.Last().VersionRange.Max);
// Get all API versions in this range
var apis = GetAllAPIHeaders().Where(a => a.VersionRange.Intersect(totalRange) != null).ToList();
// Get the API exports for the binary
var exports = binary.GetAPIExports();
// No il2cpp exports? Just return the earliest version from the header range
// The API version may be incorrect but should be a subset of the real API and won't cause C++ compile errors
if (!exports.Any()) {
Console.WriteLine("No IL2CPP API exports found in binary - IL2CPP APIs will be unavailable in C++ project");
return typeHeaders.Select(t => new UnityHeaders(t, apis[0])).ToList();
}
// Go through all of the possible API versions and see how closely they match the binary
// Note: if apis.Count == 1, we can't actually narrow down the version range further,
// but we still need to check that the APIs actually exist in the binary
var apiMatches = new List<UnityResource>();
foreach (var api in apis) {
var apiFunctionList = GetFunctionNamesFromAPIHeaderText(api.GetText());
// Every single function in the API list must be an export for a match
if (!apiFunctionList.Except(exports.Keys).Any()) {
apiMatches.Add(api);
}
}
if (apiMatches.Any()) {
// Intersect all API ranges with all header ranges to produce final list of possible ranges
Console.WriteLine("IL2CPP API discovery was successful");
return typeHeaders.SelectMany(
t => apis.Where(a => t.VersionRange.Intersect(a.VersionRange) != null)
.Select(a => new UnityHeaders(t, a))).ToList();
}
// None of the possible API versions match the binary
// Select the oldest API version from the group - C++ project compilation will fail
Console.WriteLine("No exact match for IL2CPP APIs found in binary - IL2CPP API availability in C++ project will be partial");
return typeHeaders.Select(t => new UnityHeaders(t, apis[0])).ToList();
}
// Convert il2cpp-api-functions.h from "DO_API(r, n, p)" to "typedef r (*n)(p)"