#include "il2cpp-config.h"
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#include "il2cpp-class-internals.h"
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#include "os/Environment.h"
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#include "os/File.h"
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#include "os/Image.h"
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#include "os/Initialize.h"
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#include "os/LibraryLoader.h"
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#include "os/Locale.h"
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#include "os/Path.h"
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#include "NativeSymbol.h"
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#include "utils/Collections.h"
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#include "utils/PathUtils.h"
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#include "utils/MemoryMappedFile.h"
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#include "utils/Runtime.h"
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#include <string>
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#include <cstdlib>
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namespace il2cpp
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{
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namespace utils
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{
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#if IL2CPP_ENABLE_NATIVE_STACKTRACES
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static Il2CppMethodPointer MaskSpareBits(const Il2CppMethodPointer method)
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{
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return (Il2CppMethodPointer)((size_t)method & ~IL2CPP_POINTER_SPARE_BITS);
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}
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struct MethodInfoToMethodPointerConverter
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{
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Il2CppMethodPointer operator()(const MethodDefinitionKey& methodInfo) const
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{
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return MaskSpareBits(methodInfo.method);
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}
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};
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typedef il2cpp::utils::collections::ArrayValueMap<Il2CppMethodPointer, MethodDefinitionKey, MethodInfoToMethodPointerConverter> NativeMethodMap;
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static NativeMethodMap s_NativeMethods;
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struct NativeSymbolMutator
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{
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void operator()(MethodDefinitionKey* method)
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{
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// So, when a function is marked as noreturn, some compilers emit a call to that function and then
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// put the next function immediately after call instruction which means the return address on the stack
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// will appear to point to the wrong function. This messes up our stack walking as we now are confused
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// which method is actually on the stack. To work around this, we add "1" to each of the function addresses,
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// so each function appears to start 1 byte later which means the address on the stack will appear as if
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// it is pointing to function that called the no return function. This is okay because no function will
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// ever return to the first byte of another function.
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method->method = reinterpret_cast<Il2CppMethodPointer>(reinterpret_cast<intptr_t>(method->method) + 1);
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}
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};
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void NativeSymbol::RegisterMethods(const std::vector<MethodDefinitionKey>& managedMethods)
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{
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s_NativeMethods.assign(managedMethods);
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#if IL2CPP_MUTATE_METHOD_POINTERS
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NativeSymbolMutator mutator;
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s_NativeMethods.mutate(mutator);
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#endif
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}
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#pragma pack(push, p1, 4)
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struct SymbolInfo
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{
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uint64_t address;
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uint32_t length;
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};
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#pragma pack(pop, p1)
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static int32_t s_SymbolCount;
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static SymbolInfo* s_SymbolInfos;
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static void* s_ImageBase;
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#if !RUNTIME_TINY
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static void* LoadSymbolInfoFileFrom(const std::string& path)
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{
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int error;
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il2cpp::os::FileHandle* handle = il2cpp::os::File::Open(path, kFileModeOpen, kFileAccessRead, kFileShareRead, kFileOptionsNone, &error);
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if (error != 0)
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return NULL;
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// Note that we won't unmap this file, we'll leave it open the entire lifetime of the process.
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void* mappedFile = utils::MemoryMappedFile::Map(handle);
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il2cpp::os::File::Close(handle, &error);
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IL2CPP_ASSERT(error == 0);
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return mappedFile;
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}
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#endif //!RUNTIME_TINY
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static void* LoadSymbolInfoFile()
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{
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#if RUNTIME_TINY
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return NULL;
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#else
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#if IL2CPP_TARGET_ANDROID
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#if defined(__i386__)
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std::string symbolMapFileName = "SymbolMap-x86";
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#elif defined(__arm__)
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std::string symbolMapFileName = "SymbolMap-ARMv7";
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#elif defined(__aarch64__)
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std::string symbolMapFileName = "SymbolMap-ARM64";
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#elif defined(__x86_64__)
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std::string symbolMapFileName = "SymbolMap-x86_64";
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#else
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#error Unknown symbol map file name
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#endif
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#else
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#if !IL2CPP_CAN_USE_MULTIPLE_SYMBOL_MAPS
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std::string symbolMapFileName = "SymbolMap";
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#elif IL2CPP_SIZEOF_VOID_P == 4
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std::string symbolMapFileName = "SymbolMap-32";
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#elif IL2CPP_SIZEOF_VOID_P == 8
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std::string symbolMapFileName = "SymbolMap-64";
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#else
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#error Unknown symbol map file name
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#endif
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#endif
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void* result = LoadSymbolInfoFileFrom(il2cpp::utils::PathUtils::Combine(il2cpp::utils::PathUtils::DirectoryName(il2cpp::os::Path::GetExecutablePath()), symbolMapFileName));
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if (result != NULL)
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return result;
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return LoadSymbolInfoFileFrom(il2cpp::utils::PathUtils::Combine(utils::Runtime::GetDataDir(), symbolMapFileName));
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#endif
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}
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static void InitializeSymbolInfos()
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{
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s_ImageBase = il2cpp::os::Image::GetImageBase();
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if (!il2cpp::os::Image::ManagedSectionExists())
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{
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void* fileBuffer = LoadSymbolInfoFile();
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if (fileBuffer == NULL)
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return;
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s_SymbolCount = *((int32_t*)fileBuffer);
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s_SymbolInfos = (SymbolInfo*)((uint8_t*)fileBuffer + sizeof(s_SymbolCount));
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}
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}
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static bool CompareEndOfSymbols(const SymbolInfo &a, const SymbolInfo &b)
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{
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return a.address + a.length < b.address + b.length;
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}
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static SymbolInfo* FindSymbolInfoForNativeMethod(Il2CppMethodPointer nativeMethod)
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{
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SymbolInfo* end = s_SymbolInfos + s_SymbolCount;
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// our 'key' could be anywhere within a symbol. Our comparison function compares the end address
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// of the symbols. By doing this, upper bound returns the first symbol whose end address is greater
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// than our 'key'. This is our symbol since our end is the first end above an interior value.
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SymbolInfo interiorSymbol = { (size_t)((char*)nativeMethod - (char*)s_ImageBase), 0 };
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SymbolInfo* containingSymbol = std::upper_bound(s_SymbolInfos, end, interiorSymbol, &CompareEndOfSymbols);
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if (containingSymbol == end)
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return NULL;
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// We only include managed methods in the symbol data. A lookup for a native method might find the
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// previous or next managed method in the data. This will be incorrect, so check the start and the size,
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// to make sure the interior symbol is really within the method found in the containing symbol.
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if ((interiorSymbol.address != containingSymbol->address) &&
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((interiorSymbol.address < containingSymbol->address) ||
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(interiorSymbol.address - containingSymbol->address > containingSymbol->length)))
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return NULL;
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return containingSymbol;
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}
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static bool s_TriedToInitializeSymbolInfo = false;
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static bool IsInstructionPointerProbablyInManagedMethod(Il2CppMethodPointer managedMethodStart, Il2CppMethodPointer instructionPointer)
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{
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const int probableMaximumManagedMethodSizeInBytes = 5000;
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if (std::abs((intptr_t)managedMethodStart - (intptr_t)instructionPointer) < probableMaximumManagedMethodSizeInBytes)
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return true;
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return false;
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}
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const VmMethod* NativeSymbol::GetMethodFromNativeSymbol(Il2CppMethodPointer nativeMethod)
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{
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if (!s_TriedToInitializeSymbolInfo)
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{
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// Only attempt to initialize the symbol information once. If it is not present the first time,
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// it likely won't be there later either. Repeated checking can cause performance problems.
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s_TriedToInitializeSymbolInfo = true;
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InitializeSymbolInfos();
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}
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// address has to be above our base address
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if ((void*)nativeMethod < (void*)s_ImageBase)
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return NULL;
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if (il2cpp::os::Image::ManagedSectionExists())
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{
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if (!il2cpp::os::Image::IsInManagedSection((void*)nativeMethod))
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return NULL;
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}
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if (s_SymbolCount > 0)
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{
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SymbolInfo* containingSymbol = FindSymbolInfoForNativeMethod(nativeMethod);
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if (containingSymbol == NULL)
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return NULL;
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nativeMethod = (Il2CppMethodPointer)((char*)s_ImageBase + containingSymbol->address);
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// We can't assume that the map file is aligned.
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// We must use the same masking/no masking logic used to insert into the data structure for the lookup.
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// If we don't, the find will try to look up unmasked in a table full of masked values.
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// do exact lookup based on the symbol start address, as that is our key
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NativeMethodMap::iterator iter = s_NativeMethods.find_first(MaskSpareBits(nativeMethod));
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if (iter != s_NativeMethods.end())
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{
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return IL2CPP_VM_METHOD_METADATA_FROM_METHOD_KEY(iter);
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}
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}
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else
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{
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// Get the first symbol greater than the one we want, because our instruction pointer
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// probably won't be at the start of the method.
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NativeMethodMap::iterator methodAfterNativeMethod = s_NativeMethods.upper_bound(nativeMethod);
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// If method are all of the managed methods are in the same custom section of the binary, then assume we
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// will find the proper method, so the end iterator means we found the last method in this list. If we
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// don't have custom sections, then we may have actually not found the method. In that case, let's not
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// return a method we are unsure of.
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if (!il2cpp::os::Image::ManagedSectionExists())
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{
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if (methodAfterNativeMethod == s_NativeMethods.end())
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return NULL;
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if (!IsInstructionPointerProbablyInManagedMethod(methodAfterNativeMethod->method, nativeMethod))
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return NULL;
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}
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// Go back one to get the method we actually want.
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if (methodAfterNativeMethod != s_NativeMethods.begin())
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methodAfterNativeMethod--;
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return IL2CPP_VM_METHOD_METADATA_FROM_METHOD_KEY(methodAfterNativeMethod);
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}
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return NULL;
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}
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bool NativeSymbol::GetMethodDebugInfo(const MethodInfo *method, Il2CppMethodDebugInfo* methodDebugInfo)
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{
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Il2CppMethodPointer nativeMethod = method->methodPointer;
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if (il2cpp::os::Image::ManagedSectionExists())
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{
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if (!il2cpp::os::Image::IsInManagedSection((void*)nativeMethod))
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return false;
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}
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int32_t codeSize = 0;
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if (s_SymbolCount > 0)
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{
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SymbolInfo* containingSymbol = FindSymbolInfoForNativeMethod(nativeMethod);
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if (containingSymbol == NULL)
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return false;
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codeSize = containingSymbol->length;
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}
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if (methodDebugInfo != NULL)
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{
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methodDebugInfo->methodPointer = method->methodPointer;
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methodDebugInfo->code_size = codeSize;
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methodDebugInfo->file = NULL;
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}
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return true;
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}
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#endif
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} /* namespace utils */
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} /* namespace il2cpp */
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