#include "il2cpp-config.h"
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#include "icalls/mscorlib/System.Diagnostics/StackFrame.h"
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#include "vm/Reflection.h"
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#include "vm/StackTrace.h"
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#include "il2cpp-class-internals.h"
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#include "gc/GarbageCollector.h"
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namespace il2cpp
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{
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namespace icalls
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{
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namespace mscorlib
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{
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namespace System
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{
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namespace Diagnostics
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{
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static bool IsCalledFromSystemDiagnosticsStackTrace(const vm::StackFrames& stack)
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{
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for (vm::StackFrames::const_iterator frame = stack.begin(); frame != stack.end(); ++frame)
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if (strcmp(frame->method->klass->namespaze, "System.Diagnostics") == 0 && strcmp(frame->method->klass->name, "StackTrace") == 0)
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return true;
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return false;
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}
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static bool FrameNeedsSkipped(const Il2CppStackFrameInfo& frame)
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{
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return strcmp(frame.method->klass->namespaze, "System.Diagnostics") == 0 &&
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(strcmp(frame.method->klass->name, "StackFrame") == 0 || strcmp(frame.method->klass->name, "StackTrace") == 0);
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}
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bool StackFrame::get_frame_info(
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int32_t skip,
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bool needFileInfo,
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Il2CppReflectionMethod ** method,
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int32_t* iloffset,
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int32_t* native_offset,
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Il2CppString** file,
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int32_t* line,
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int32_t* column)
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{
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const int kSkippedFramesFromMSCorlibStackFrameMethods = 2;
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const int kSkippedFramesFromMSCorlibStackTraceMethods = 2;
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const vm::StackFrames& stack = *vm::StackTrace::GetCachedStackFrames(skip);
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// Always ignore the skipped frames from System.Diagnostics.StackFrame, as we know we are always called from it.
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// These frames might be inlined or optimized away by the C++ compiler, so we will inspect the actual stack
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// frames later to see if we need to add skipped frames back in for System.Diagnostics.StackFrame.
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skip -= kSkippedFramesFromMSCorlibStackFrameMethods;
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// Sometimes ignore the skipped frames from System.Diagnostics.StackTrace, as we may or may not be called from it.
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// These frames might be inlined or optimized away by the C++ compiler, so we will inspect the actual stack
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// frames later to see if we need to add skipped frames back in for System.Diagnostics.StackTrace.
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if (IsCalledFromSystemDiagnosticsStackTrace(stack))
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skip -= kSkippedFramesFromMSCorlibStackTraceMethods;
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// Now look in the actual stack trace to see if anything we ignored above is really there. We don't know what the C++
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// compile will do with these frames, so we need to inspect each frame and check.
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for (vm::StackFrames::const_iterator frame = stack.begin(); frame != stack.end(); ++frame)
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{
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if (FrameNeedsSkipped(*frame))
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skip++;
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}
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// Finally, find the location in the stack we actually want to use by offsetting from the end of the stack the number of
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// frames we skipped, and offsetting it by one more to account for this icall itself.
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int64_t index = stack.size() - skip - 1;
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if (static_cast<uint64_t>(index) >= stack.size() || index < 0)
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return false;
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const Il2CppStackFrameInfo& info = stack[static_cast<size_t>(index)];
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*method = vm::Reflection::GetMethodObject(info.method, info.method->klass);
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il2cpp::gc::GarbageCollector::SetWriteBarrier((void**)method);
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return true;
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}
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} /* namespace Diagnostics */
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} /* namespace System */
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} /* namespace mscorlib */
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} /* namespace icalls */
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} /* namespace il2cpp */
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