Cleanup stack limits usage (#41946)

There were couple of members / functions for stack limits checking that
were not used anymore.

Author: janvorli

src/coreclr/src/vm/threads.cpp

@@ -1418,9 +1418,6 @@ Thread::Thread()
     m_CacheStackSufficientExecutionLimit = 0;
     m_CacheStackStackAllocNonRiskyExecutionLimit = 0;
 
-    m_LastAllowableStackAddress= 0;
-    m_ProbeLimit = 0;
-
 #ifdef _DEBUG
     m_pCleanedStackBase = NULL;
 #endif
@@ -1707,8 +1704,6 @@ BOOL Thread::InitThread()
     if (m_CacheStackBase == 0)
     {
         _ASSERTE(m_CacheStackLimit == 0);
-        _ASSERTE(m_LastAllowableStackAddress == 0);
-        _ASSERTE(m_ProbeLimit == 0);
         ret = SetStackLimits(fAll);
         if (ret == FALSE)
         {
@@ -6415,24 +6410,6 @@ BOOL Thread::SetStackLimits(SetStackLimitScope scope)
     if (FAILED(CLRSetThreadStackGuarantee()))
         return FALSE;
 
-    // Cache the last stack addresses that we are allowed to touch.  We throw a stack overflow
-    // if we cross that line.  Note that we ignore any subsequent calls to STSG for Whidbey until
-    // we see an exception and recache the values.  We use the LastAllowableAddresses to
-    // determine if we've taken a hard SO and the ProbeLimits on the probes themselves.
-
-    m_LastAllowableStackAddress = GetLastNormalStackAddress();
-
-    if (g_pConfig->ProbeForStackOverflow())
-    {
-        m_ProbeLimit = m_LastAllowableStackAddress;
-    }
-    else
-    {
-        // If we have stack probing disabled, set the probeLimit to 0 so that all probes will pass.  This
-        // way we don't have to do an extra check in the probe code.
-        m_ProbeLimit = 0;
-    }
-
     return TRUE;
 }
 
@@ -6685,34 +6662,6 @@ void Thread::DebugLogStackMBIs()
 }
 #endif // _DEBUG
 
-//
-// IsSPBeyondLimit
-//
-// Determines if the stack pointer is beyond the stack limit, in which case
-// we can assume we've taken a hard SO.
-//
-// Parameters: none
-//
-// Returns: bool indicating if SP is beyond the limit or not
-//
-BOOL Thread::IsSPBeyondLimit()
-{
-    WRAPPER_NO_CONTRACT;
-
-    // Reset the stack limits if necessary.
-    // @todo .  Add a vectored handler for X86 so that we reset the stack limits
-    // there, as anything that supports SetThreadStackGuarantee will support vectored handlers.
-    // Then we can always assume during EH processing that our stack limits are good and we
-    // don't have to call ResetStackLimits.
-    ResetStackLimits();
-    char *approxSP = (char *)GetCurrentSP();
-    if  (approxSP < (char *)(GetLastAllowableStackAddress()))
-    {
-        return TRUE;
-    }
-    return FALSE;
-}
-
 NOINLINE void AllocateSomeStack(){
     LIMITED_METHOD_CONTRACT;
 #ifdef TARGET_X86

src/coreclr/src/vm/threads.h

@@ -3222,16 +3222,6 @@ class Thread
     static UINT_PTR GetLastNormalStackAddress(UINT_PTR stackBase);
     UINT_PTR GetLastNormalStackAddress();
 
-    UINT_PTR GetLastAllowableStackAddress()
-    {
-        return m_LastAllowableStackAddress;
-    }
-
-    UINT_PTR GetProbeLimit()
-    {
-        return m_ProbeLimit;
-    }
-
     void ResetStackLimits()
     {
         CONTRACTL
@@ -3248,8 +3238,6 @@ class Thread
         SetStackLimits(fAllowableOnly);
     }
 
-    BOOL IsSPBeyondLimit();
-
     INDEBUG(static void DebugLogStackMBIs());
 
 #if defined(_DEBUG_IMPL) && !defined(DACCESS_COMPILE)
@@ -3659,16 +3647,6 @@ class Thread
 
     ThreadExceptionState  m_ExceptionState;
 
-    //-----------------------------------------------------------
-    // For stack probing.  These are the last allowable addresses that a thread
-    // can touch.  Going beyond is a stack overflow.  The ProbeLimit will be
-    // set based on whether SO probing is enabled.  The LastAllowableAddress
-    // will always represent the true stack limit.
-    //-----------------------------------------------------------
-    UINT_PTR             m_ProbeLimit;
-
-    UINT_PTR             m_LastAllowableStackAddress;
-
 private:
     //---------------------------------------------------------------
     // m_debuggerFilterContext holds the thread's "filter context" for the