#include "il2cpp-config.h"
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#if IL2CPP_TARGET_ANDROID
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#include "os/StackTrace.h"
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#include "os/Image.h"
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#include <unwind.h>
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#include <dlfcn.h>
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#include <pthread.h>
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#include <string.h>
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namespace il2cpp
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{
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namespace os
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{
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const int kMaxStackFrames = 128;
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namespace
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{
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extern "C" char end;
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uintptr_t s_BaseAddress;
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uintptr_t s_EndAddress;
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pthread_once_t s_InitKnownSymbolInfoOnceFlag = PTHREAD_ONCE_INIT;
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static void InitKnownSymbolInfo()
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{
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s_BaseAddress = reinterpret_cast<uintptr_t>(os::Image::GetImageBase());
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s_EndAddress = reinterpret_cast<uintptr_t>(&end);
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}
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static bool KnownSymbol(const uintptr_t addr)
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{
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pthread_once(&s_InitKnownSymbolInfoOnceFlag, &InitKnownSymbolInfo);
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if (addr >= s_BaseAddress && addr <= s_EndAddress)
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return true;
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Dl_info info;
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if (!dladdr(reinterpret_cast<void*>(addr), &info))
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return false;
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// dli_name can have different values depending on Android OS:
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// Google Pixel 2 Android 10, dli_name will be "/data/app/com.unity.stopaskingforpackagename-uRHSDLXYA4cnHxyTNT30-g==/lib/arm/libunity.so"
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// Samsung GT-I9505 Android 5, dli_name will be "libunity.so"
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return info.dli_fname != NULL && strstr(info.dli_fname, "libunity.so") != NULL;
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}
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struct AndroidStackTrace
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{
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size_t size;
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Il2CppMethodPointer addrs[kMaxStackFrames];
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bool PushStackFrameAddress(const uintptr_t addr)
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{
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if (size >= kMaxStackFrames)
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return false;
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addrs[size++] = reinterpret_cast<Il2CppMethodPointer>(addr);
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return true;
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}
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static _Unwind_Reason_Code Callback(struct _Unwind_Context* context, void* self)
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{
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const uintptr_t addr = _Unwind_GetIP(context);
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// Workaround to avoid crash when generating stack trace in some third-party libraries
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if (!KnownSymbol(addr))
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return _URC_END_OF_STACK;
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if (static_cast<AndroidStackTrace*>(self)->PushStackFrameAddress(addr))
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return _URC_NO_REASON;
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else
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return _URC_END_OF_STACK;
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}
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};
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}
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void StackTrace::WalkStackNative(WalkStackCallback callback, void* context, WalkOrder walkOrder)
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{
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AndroidStackTrace callstack = {};
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_Unwind_Backtrace(AndroidStackTrace::Callback, &callstack);
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for (size_t i = 0; i < callstack.size; ++i)
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{
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const size_t index = (walkOrder == kFirstCalledToLastCalled) ? (callstack.size - i - 1) : i;
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if (!callback(callstack.addrs[index], context))
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break;
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}
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}
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std::string StackTrace::NativeStackTrace()
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{
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return std::string();
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}
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const void* StackTrace::GetStackPointer()
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{
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return __builtin_frame_address(0);
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}
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}
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}
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#endif
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