Remove Helper Method Frames from debugdebugger

src/coreclr/System.Private.CoreLib/src/System/Diagnostics/Debugger.cs

@@ -11,15 +11,15 @@ namespace System.Diagnostics
 {
     public static partial class Debugger
     {
+        [LibraryImport(RuntimeHelpers.QCall, EntryPoint = "DebugDebugger_Break")]
+        private static partial void BreakInternal();
+
         // Break causes a breakpoint to be signalled to an attached debugger.  If no debugger
         // is attached, the user is asked if they want to attach a debugger. If yes, then the
         // debugger is launched.
         [MethodImpl(MethodImplOptions.NoInlining)]
         public static void Break() => BreakInternal();
 
-        [MethodImpl(MethodImplOptions.InternalCall)]
-        private static extern void BreakInternal();
-
         // Launch launches & attaches a debugger to the process. If a debugger is already attached,
         // nothing happens.
         //
@@ -30,11 +30,6 @@ public static partial class Debugger
         // See code:NotifyOfCrossThreadDependency for more details.
         private sealed class CrossThreadDependencyNotification : ICustomDebuggerNotification { }
 
-        // Do not inline the slow path
-        [MethodImpl(MethodImplOptions.NoInlining)]
-        private static void NotifyOfCrossThreadDependencySlow() =>
-            CustomNotification(new CrossThreadDependencyNotification());
-
         // Sends a notification to the debugger to indicate that execution is about to enter a path
         // involving a cross thread dependency. A debugger that has opted into this type of notification
         // can take appropriate action on receipt. For example, performing a funceval normally requires
@@ -49,6 +44,14 @@ public static void NotifyOfCrossThreadDependency()
             {
                 NotifyOfCrossThreadDependencySlow();
             }
+
+            // Do not inline the slow path
+            [MethodImpl(MethodImplOptions.NoInlining)]
+            static void NotifyOfCrossThreadDependencySlow()
+            {
+                var notify = new CrossThreadDependencyNotification();
+                CustomNotification(ObjectHandleOnStack.Create(ref notify));
+            }
         }
 
         [LibraryImport(RuntimeHelpers.QCall, EntryPoint = "DebugDebugger_Launch")]
@@ -89,7 +92,7 @@ public static extern bool IsAttached
         // Posts a custom notification for the attached debugger.  If there is no
         // debugger attached, has no effect.  The debugger may or may not
         // report the notification depending on its settings.
-        [MethodImpl(MethodImplOptions.InternalCall)]
-        private static extern void CustomNotification(ICustomDebuggerNotification data);
+        [LibraryImport(RuntimeHelpers.QCall, EntryPoint = "DebugDebugger_CustomNotification")]
+        private static partial void CustomNotification(ObjectHandleOnStack data);
     }
 }

src/coreclr/System.Private.CoreLib/src/System/Diagnostics/StackFrame.CoreCLR.cs

@@ -30,9 +30,9 @@ internal StackFrame(StackFrameHelper stackFrameHelper, int skipFrames, bool need
 
         private void BuildStackFrame(int skipFrames, bool needFileInfo)
         {
-            StackFrameHelper StackF = new StackFrameHelper(null);
+            StackFrameHelper StackF = new StackFrameHelper();
 
-            StackF.InitializeSourceInfo(0, needFileInfo, null);
+            StackF.InitializeSourceInfo(needFileInfo, null);
 
             int iNumOfFrames = StackF.GetNumberOfFrames();
 

src/coreclr/System.Private.CoreLib/src/System/Diagnostics/StackFrameHelper.cs

@@ -13,7 +13,6 @@ namespace System.Diagnostics
     // VM\DebugDebugger.h. The binder will catch some of these layout problems.
     internal sealed class StackFrameHelper
     {
-        private Thread? targetThread;
         private int[]? rgiOffset;
         private int[]? rgiILOffset;
 
@@ -48,9 +47,8 @@ private delegate void GetSourceLineInfoDelegate(Assembly? assembly, string assem
         [ThreadStatic]
         private static int t_reentrancy;
 
-        public StackFrameHelper(Thread? target)
+        public StackFrameHelper()
         {
-            targetThread = target;
             rgMethodHandle = null;
             rgiMethodToken = null;
             rgiOffset = null;
@@ -85,9 +83,9 @@ public StackFrameHelper(Thread? target)
         // done by GetStackFramesInternal (on Windows for old PDB format).
         //
 
-        internal void InitializeSourceInfo(int iSkip, bool fNeedFileInfo, Exception? exception)
+        internal void InitializeSourceInfo(bool fNeedFileInfo, Exception? exception)
         {
-            StackTrace.GetStackFramesInternal(this, iSkip, fNeedFileInfo, exception);
+            StackTrace.GetStackFramesInternal(this, fNeedFileInfo, exception);
 
             if (!fNeedFileInfo)
                 return;

src/coreclr/System.Private.CoreLib/src/System/Diagnostics/StackTrace.CoreCLR.cs

@@ -3,13 +3,17 @@
 
 using System.Reflection;
 using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
 
 namespace System.Diagnostics
 {
     public partial class StackTrace
     {
-        [MethodImpl(MethodImplOptions.InternalCall)]
-        internal static extern void GetStackFramesInternal(StackFrameHelper sfh, int iSkip, bool fNeedFileInfo, Exception? e);
+        [LibraryImport(RuntimeHelpers.QCall, EntryPoint = "StackTrace_GetStackFramesInternal")]
+        private static partial void GetStackFramesInternal(ObjectHandleOnStack sfh, [MarshalAs(UnmanagedType.Bool)] bool fNeedFileInfo, ObjectHandleOnStack e);
+
+        internal static void GetStackFramesInternal(StackFrameHelper sfh, bool fNeedFileInfo, Exception? e)
+            => GetStackFramesInternal(ObjectHandleOnStack.Create(ref sfh), fNeedFileInfo, ObjectHandleOnStack.Create(ref e));
 
         internal static int CalculateFramesToSkip(StackFrameHelper StackF, int iNumFrames)
         {
@@ -57,9 +61,9 @@ private void CaptureStackTrace(int skipFrames, bool fNeedFileInfo, Exception? e)
         {
             _methodsToSkip = skipFrames;
 
-            StackFrameHelper StackF = new StackFrameHelper(null);
+            StackFrameHelper StackF = new StackFrameHelper();
 
-            StackF.InitializeSourceInfo(0, fNeedFileInfo, e);
+            StackF.InitializeSourceInfo(fNeedFileInfo, e);
 
             _numOfFrames = StackF.GetNumberOfFrames();
 

src/coreclr/debug/daccess/dacdbiimpl.cpp

@@ -3707,7 +3707,6 @@ void DacDbiInterfaceImpl::GetStackFramesFromException(VMPTR_Object vmObject, Dac
     DebugStackTrace::GetStackFramesData stackFramesData;
 
     stackFramesData.pDomain = NULL;
-    stackFramesData.skip = 0;
     stackFramesData.NumFramesRequested = 0;
 
     DebugStackTrace::GetStackFramesFromException(&objRef, &stackFramesData);
@@ -3720,7 +3719,7 @@ void DacDbiInterfaceImpl::GetStackFramesFromException(VMPTR_Object vmObject, Dac
 
         for (INT32 index = 0; index < dacStackFramesLength; ++index)
         {
-            DebugStackTrace::DebugStackTraceElement const& currentElement = stackFramesData.pElements[index];
+            DebugStackTrace::Element const& currentElement = stackFramesData.pElements[index];
             DacExceptionCallStackData& currentFrame = dacStackFrames[index];
 
             AppDomain* pDomain = AppDomain::GetCurrentDomain();

src/coreclr/debug/ee/debugger.cpp

@@ -8849,7 +8849,7 @@ void Debugger::SendUserBreakpoint(Thread * thread)
     {
         THROWS;
         GC_TRIGGERS;
-        MODE_ANY;
+        MODE_PREEMPTIVE;
 
         PRECONDITION(thread != NULL);
         PRECONDITION(thread == ::GetThreadNULLOk());

src/coreclr/dlls/mscorrc/mscorrc.rc

@@ -468,7 +468,6 @@ BEGIN
     IDS_EE_INVALID_CA                       "Invalid custom attribute provided."
 
     IDS_EE_THREAD_CANNOT_GET                "Unable to retrieve thread information."
-    IDS_EE_THREAD_BAD_STATE                 "Thread in invalid state."
     IDS_EE_THREAD_ABORT_WHILE_SUSPEND       "Thread is suspended; attempting to abort."
     IDS_EE_NOVARIANTRETURN                  "PInvoke restriction: cannot return variants."
 

src/coreclr/dlls/mscorrc/resource.h

@@ -233,7 +233,6 @@
 #define IDS_EE_INVALID_CA                       0x1a10
 
 #define IDS_EE_THREAD_CANNOT_GET                0x1a15
-#define IDS_EE_THREAD_BAD_STATE                 0x1a1b
 #define IDS_EE_THREAD_ABORT_WHILE_SUSPEND       0x1a1c
 
 #define IDS_EE_NOVARIANTRETURN                  0x1a1d

src/coreclr/vm/corelib.h

@@ -761,7 +761,6 @@ DEFINE_METHOD(SAFE_HANDLE,          DISPOSE_BOOL,           Dispose,
 DEFINE_CLASS(SECURITY_EXCEPTION,    Security,               SecurityException)
 
 DEFINE_CLASS_U(Diagnostics,                StackFrameHelper,   StackFrameHelper)
-DEFINE_FIELD_U(targetThread,               StackFrameHelper,   targetThread)
 DEFINE_FIELD_U(rgiOffset,                  StackFrameHelper,   rgiOffset)
 DEFINE_FIELD_U(rgiILOffset,                StackFrameHelper,   rgiILOffset)
 DEFINE_FIELD_U(dynamicMethods,             StackFrameHelper,   dynamicMethods)