From 56d4ba8a9338c3ff7378d18378f38ad847f130f2 Mon Sep 17 00:00:00 2001
From: danmosemsft <danmose@microsoft.com>
Date: Sat, 11 Feb 2017 07:20:12 -0800
Subject: Revert "Remove always defined FEATURE_CORESYSTEM"

This reverts commit 751771a8976f909af772e35c167bd7e3ffbe44c8.
---
 src/vm/domainfile.cpp | 106 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 106 insertions(+)

(limited to 'src/vm/domainfile.cpp')

diff --git a/src/vm/domainfile.cpp b/src/vm/domainfile.cpp
index e66ebaef8b..bf7fc57774 100644
--- a/src/vm/domainfile.cpp
+++ b/src/vm/domainfile.cpp
@@ -3373,7 +3373,113 @@ bool DomainAssembly::GetDebuggingOverrides(DWORD *pdwFlags)
     }
     CONTRACTL_END;
 
+#if defined(DEBUGGING_SUPPORTED) && !defined(FEATURE_CORESYSTEM)
+    // TODO FIX in V5.0
+    // Any touch of the file system is relatively expensive even in the warm case. 
+    // 
+    // Ideally we remove the .INI feature completely (if we need something put it in the .exe.config file)
+    // 
+    // However because of compatibility concerns, we won't do this until the next side-by-side release
+    // In the mean time don't check in the case where we have already loaded the NGEN image, as the
+    // JIT overrides don't mean anything in that case as we won't be jitting anyway.  
+    // This avoids doing these probes for framework DLLs right away.
+    if (GetFile()->HasNativeImage())
+        return false;
+
+    _ASSERTE(pdwFlags);
+
+    bool fHasBits = false;
+    WCHAR *pFileName = NULL;
+    HRESULT hr = S_OK;
+    UINT cbExtOrValue = 4;
+    WCHAR *pTail = NULL;
+    size_t len = 0;
+    WCHAR *lpFileName = NULL;
+
+    const WCHAR *wszFileName = GetFile()->GetPath();
+
+    if (wszFileName == NULL)
+    {
+        return false;
+    }
+
+    // lpFileName is a copy of the original, and will be edited.
+    CQuickBytes qb;
+    len = wcslen(wszFileName);
+    size_t cchlpFileName = (len + 1);
+    lpFileName = (WCHAR*)qb.AllocThrows(cchlpFileName * sizeof(WCHAR));
+    wcscpy_s(lpFileName, cchlpFileName, wszFileName);
+
+    pFileName = wcsrchr(lpFileName, W('\\'));
+
+    if (pFileName == NULL)
+    {
+        pFileName = lpFileName;
+    }
+
+    if (*pFileName == W('\\'))
+    {
+        pFileName++; //move the pointer past the last '\'
+    }
+
+    _ASSERTE(wcslen(W(".INI")) == cbExtOrValue);
+
+    if (pFileName == NULL || (pTail=wcsrchr(pFileName, W('.'))) == NULL || (wcslen(pTail)<cbExtOrValue))
+    {
+        return false;
+    }
+
+    wcscpy_s(pTail, cchlpFileName - (pTail - lpFileName), W(".INI"));
+
+    // Win2K has a problem if multiple processes call GetPrivateProfile* on the same
+    // non-existent .INI file simultaneously.  The OS livelocks in the kernel (i.e.
+    // outside of user space) and remains there at full CPU for several minutes.  Then
+    // it breaks out.  Here is our work-around, while we pursue a fix in a future
+    // version of the OS.
+    if (WszGetFileAttributes(lpFileName) == INVALID_FILE_ATTRIBUTES)
+        return false;
+
+    // Having modified the filename, we use the full path
+    // to actually get the file.
+    if ((cbExtOrValue=WszGetPrivateProfileInt(DE_INI_FILE_SECTION_NAME,
+                                              DE_INI_FILE_KEY_TRACK_INFO,
+                                              INVALID_INI_INT,
+                                              lpFileName)) != INVALID_INI_INT)
+    {
+        if (cbExtOrValue != 0)
+        {
+            *pdwFlags |= DACF_OBSOLETE_TRACK_JIT_INFO;
+        }
+        else
+        {
+            *pdwFlags &= (~DACF_OBSOLETE_TRACK_JIT_INFO);
+        }
+
+        fHasBits = true;
+    }
+
+    if ((cbExtOrValue=WszGetPrivateProfileInt(DE_INI_FILE_SECTION_NAME,
+                                              DE_INI_FILE_KEY_ALLOW_JIT_OPTS,
+                                              INVALID_INI_INT,
+                                              lpFileName)) != INVALID_INI_INT)
+    {
+        if (cbExtOrValue != 0)
+        {
+            *pdwFlags |= DACF_ALLOW_JIT_OPTS;
+        }
+        else
+        {
+            *pdwFlags &= (~DACF_ALLOW_JIT_OPTS);
+        }
+
+        fHasBits = true;
+    }
+
+    return fHasBits;
+
+#else  // DEBUGGING_SUPPORTED && !FEATURE_CORESYSTEM
     return false;
+#endif // DEBUGGING_SUPPORTED && !FEATURE_CORESYSTEM
 }
 
 
-- 
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