Enable ILASM for *nix

This enables ILASM for x-platforms.
1. Added a bunch of warning disable options mostly due to this prebuilt asmparse.cpp
2. Create a separte entry point "main" to pass WCHAR arguments.
3. PDB (CorSymWriter) part is disabled.
4. Converting/embedding resource file to binary is disabled.
5. jkotas kindly provided a code for IsTextUnicode which is unavailable on CoreCLR.

26 files changed, 281 insertions, 107 deletions

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 64d7d63f80..1046e3ded1 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -86,9 +86,9 @@ add_subdirectory(ToolBox)
 add_subdirectory(tools)
 add_subdirectory(unwinder)
 add_subdirectory(ildasm)
+add_subdirectory(ilasm)
 
 if(WIN32)
-  add_subdirectory(ilasm)
   add_subdirectory(ipcman)
 endif(WIN32)
 
diff --git a/src/dlls/CMakeLists.txt b/src/dlls/CMakeLists.txt
index e0bdd37a6f..932e65e350 100644
--- a/src/dlls/CMakeLists.txt
+++ b/src/dlls/CMakeLists.txt
@@ -1,9 +1,9 @@
 if(WIN32)
     add_subdirectory(clretwrc)
-    add_subdirectory(mscorpe)
 endif(WIN32)
 add_subdirectory(dbgshim)
 add_subdirectory(mscordbi)
 add_subdirectory(mscordac)
 add_subdirectory(mscoree)
+add_subdirectory(mscorpe)
 add_subdirectory(mscorrc)
diff --git a/src/dlls/mscorpe/CMakeLists.txt b/src/dlls/mscorpe/CMakeLists.txt
index b41848f2e6..f20f043eb7 100644
--- a/src/dlls/mscorpe/CMakeLists.txt
+++ b/src/dlls/mscorpe/CMakeLists.txt
@@ -3,10 +3,10 @@ project(mscorpe)
 add_definitions(-DFEATURE_CORECLR)
 
 set(MSCORPE_SOURCES
-  ICeeFileGen.cpp
-  CeeFileGenWriter.cpp
-  PEWriter.cpp
-  CeeFileGenWriterTokens.cpp
+  iceefilegen.cpp
+  ceefilegenwriter.cpp
+  pewriter.cpp
+  ceefilegenwritertokens.cpp
   utilcodeinit.cpp
 )
 
@@ -14,6 +14,8 @@ if(WIN32)
   list(APPEND MSCORPE_SOURCES
     Native.rc
   )
+else()
+  add_compile_options(-Wno-delete-non-virtual-dtor)
 endif(WIN32)
 
 add_library(mscorpe STATIC
diff --git a/src/dlls/mscorpe/ceefilegenwriter.cpp b/src/dlls/mscorpe/ceefilegenwriter.cpp
index 555dde2621..e40e8ac710 100644
--- a/src/dlls/mscorpe/ceefilegenwriter.cpp
+++ b/src/dlls/mscorpe/ceefilegenwriter.cpp
@@ -227,7 +227,7 @@ CeeFileGenWriter::CeeFileGenWriter() // ctor is protected
 #ifdef ENC_DELTA_HACK
     // for EnC we want the RVA to be right at the front of the IL stream
     WCHAR szFileName[256];
-    DWORD len = WszGetEnvironmentVariable(L"COMP_ENC_EMIT", szFileName, NumItems(szFileName));
+    DWORD len = WszGetEnvironmentVariable(W("COMP_ENC_EMIT"), szFileName, NumItems(szFileName));
     if (len > 0)
         g_EnCMode = TRUE;
 #endif
@@ -335,10 +335,11 @@ HRESULT CeeFileGenWriter::link()
         hr = emitExeMain();
         if (FAILED(hr))
             return hr;
-
+#ifndef FEATURE_PAL
         hr = emitResourceSection();
         if (FAILED(hr))
             return hr;
+#endif
     }
 
     m_linked = true;
@@ -386,8 +387,9 @@ HRESULT CeeFileGenWriter::fixup()
 HRESULT CeeFileGenWriter::generateImage(void **ppImage)
 {
     HRESULT hr = S_OK;
-    LPWSTR outputFileName = NULL;
+    LPCWSTR outputFileName = NULL;
 
+#ifndef FEATURE_PAL
     HANDLE hThreadToken = NULL;
     // Impersonation is only supported on Win2k and above. 
     if (!OpenThreadToken(GetCurrentThread(), TOKEN_READ | TOKEN_IMPERSONATE, TRUE, &hThreadToken)) 
@@ -408,6 +410,7 @@ HRESULT CeeFileGenWriter::generateImage(void **ppImage)
             return HRESULT_FROM_GetLastError();
         }                
     }
+#endif // !FEATURE_PAL
 
 #ifdef ENC_DELTA_HACK
     // fixups break because we've set the base RVA to 0 for the delta stream
@@ -420,13 +423,13 @@ HRESULT CeeFileGenWriter::generateImage(void **ppImage)
 
     if (! outputFileName && ppImage == NULL) {
         if (m_comImageFlags & COMIMAGE_FLAGS_IL_LIBRARY)
-            outputFileName = L"output.ill";
+            outputFileName = W("output.ill");
         else if (m_dllSwitch)
-            outputFileName = L"output.dll";
+            outputFileName = W("output.dll");
         else if (m_objSwitch)
-            outputFileName = L"output.obj";
+            outputFileName = W("output.exe");
         else
-            outputFileName = L"output.exe";
+            outputFileName = W("output.obj");
     }
 
     // output file name and ppImage are mutually exclusive
@@ -438,6 +441,7 @@ HRESULT CeeFileGenWriter::generateImage(void **ppImage)
         IfFailGo(getPEWriter().write(ppImage));
 
 ErrExit:
+#ifndef FEATURE_PAL
     if (hThreadToken != NULL) 
     {
         BOOL success = SetThreadToken(NULL, hThreadToken);
@@ -449,6 +453,7 @@ ErrExit:
             hr = HRESULT_FROM_GetLastError();
         }
     }
+#endif // !FEATURE_PAL
     return hr;
 } // HRESULT CeeFileGenWriter::generateImage()
 
@@ -504,7 +509,7 @@ HRESULT CeeFileGenWriter::emitLibraryName(IMetaDataEmit *emitter)
         WCHAR wzGuid[40];
         BYTE  rgCA[50];
         IfFailRet(emitter->DefineTypeRefByName(mdTypeRefNil, INTEROP_GUID_TYPE_W, &tr));
-        IfFailRet(emitter->DefineMemberRef(tr, L".ctor", _SIG, sizeof(_SIG), &mr));
+        IfFailRet(emitter->DefineMemberRef(tr, W(".ctor"), _SIG, sizeof(_SIG), &mr));
         StringFromGUID2(m_libraryGuid, wzGuid, lengthof(wzGuid));
         memset(rgCA, 0, sizeof(rgCA));
         // Tag is 0x0001
@@ -997,7 +1002,7 @@ HRESULT GetClrSystemDirectory(__out_ecount_part(cchBuffer, *pdwLength) LPWSTR pb
         return CopySystemDirectory(pPath, pbuffer, cchBuffer, pdwLength);
 }
 
-
+#ifndef FEATURE_PAL
 BOOL RunProcess(LPCWSTR tempResObj, LPCWSTR pszFilename, DWORD* pdwExitCode, PEWriter &pewriter)
 {
     BOOL fSuccess = FALSE;
@@ -1472,6 +1477,7 @@ lDone: ;
 
     return hr;
 } // HRESULT CeeFileGenWriter::emitResourceSection()
+#endif // !FEATURE_PAL
 
 HRESULT CeeFileGenWriter::setManifestEntry(ULONG size, ULONG offset)
 {
diff --git a/src/dlls/mscorpe/pewriter.cpp b/src/dlls/mscorpe/pewriter.cpp
index 7494ad9d3d..450b26cc53 100644
--- a/src/dlls/mscorpe/pewriter.cpp
+++ b/src/dlls/mscorpe/pewriter.cpp
@@ -242,6 +242,7 @@ static inline HRESULT SubOvf_U_U32(UINT64 & a, unsigned int b)
     return S_OK;
 }
 
+#ifndef _AMD64_
 /* subtract two unsigned pointers yeilding a signed pointer sized int */
 static inline HRESULT SubOvf_U_U(INT64 & r, UINT64 a, UINT64 b)
 {
@@ -253,6 +254,7 @@ static inline HRESULT SubOvf_U_U(INT64 & r, UINT64 a, UINT64 b)
     }
     return E_FAIL;
 }
+#endif
 
 
 /******************************************************************/
@@ -1898,7 +1900,7 @@ HRESULT PEWriter::fixup(CeeGenTokenMapper *pMapper)
 
         for(PESectionReloc* rcur = textSection->m_relocStart; rcur < textSection->m_relocCur; rcur++)
         {
-            switch(rcur->type)
+            switch((int)rcur->type)
             {
                 case 0x7FFA: // Ptr to symbol name
 #ifdef _WIN64
@@ -2026,7 +2028,7 @@ HRESULT PEWriter::fixup(CeeGenTokenMapper *pMapper)
                         {
                             IMAGE_SECTION_HEADER* phdr = textSection->m_header;
                             // Add to reloc table
-                            IMAGE_RELOC_FIELD(ir, VirtualAddress) = VAL32(rva);
+                            ir.VirtualAddress = VAL32(rva);
                             ir.SymbolTableIndex = VAL32(i);
                             ir.Type = VAL16(IMAGE_REL_I386_SECREL);
                             if(phdr->PointerToRelocations == 0)
@@ -2176,7 +2178,7 @@ HRESULT PEWriter::Close()
 }
 
 /******************************************************************/
-HRESULT PEWriter::write(__in const LPWSTR fileName) {
+HRESULT PEWriter::write(__in LPCWSTR fileName) {
 
     HRESULT hr;
 
diff --git a/src/dlls/mscorpe/pewriter.h b/src/dlls/mscorpe/pewriter.h
index 67441eee75..8ef9e5666a 100644
--- a/src/dlls/mscorpe/pewriter.h
+++ b/src/dlls/mscorpe/pewriter.h
@@ -43,7 +43,7 @@ public:
 
     HRESULT link();
     HRESULT fixup(CeeGenTokenMapper *pMapper);
-    HRESULT write(__in const LPWSTR fileName);
+    HRESULT write(__in LPCWSTR fileName);
     HRESULT write(void **ppImage);
 
     // calling these functions is optional
diff --git a/src/ilasm/CMakeLists.txt b/src/ilasm/CMakeLists.txt
index 3481eb4a7a..eb84533770 100644
--- a/src/ilasm/CMakeLists.txt
+++ b/src/ilasm/CMakeLists.txt
@@ -8,6 +8,7 @@ add_definitions(-D__ILASM__)
 add_definitions(-DFEATURE_CORECLR)
 
 include_directories(.)
+include_directories(../ildasm/unixcoreclrloader)
 
 set(ILASM_SOURCES
   assem.cpp
@@ -19,31 +20,55 @@ set(ILASM_SOURCES
   assembler.cpp
   prebuilt/asmparse.c
 )
-if(WIN32)
-  set_source_files_properties(prebuilt/asmparse.c PROPERTIES COMPILE_FLAGS "/TP")
-endif(WIN32)
+set_source_files_properties( prebuilt/asmparse.c PROPERTIES LANGUAGE CXX )
+
+if(CLR_CMAKE_PLATFORM_UNIX)
+  add_compile_options(-x c++)
+  # Need generate a right form of asmparse.c to avoid the following options.
+  # https://github.com/dotnet/coreclr/issues/2305
+  add_compile_options(-Wno-delete-non-virtual-dtor)
+  add_compile_options(-Wno-deprecated-register)
+  add_compile_options(-Wno-array-bounds)
+  add_compile_options(-Wno-unused-label)
+endif(CLR_CMAKE_PLATFORM_UNIX)
 
 add_executable(ilasm
   ${ILASM_SOURCES}
 )
 
 set(ILASM_LINK_LIBRARIES
-  mscorpe
   utilcodestaticnohost
+  mscorpe
   mdhotdata_full
   corguids
 )
 
 if(CLR_CMAKE_PLATFORM_UNIX)
-  #TODO
+  target_link_libraries(ilasm
+    ${ILASM_LINK_LIBRARIES}
+    ceefgen
+    unixcoreclrloader
+    utilcodestaticnohost
+    mscorrc_debug
+    coreclrpal
+    palrt
+  )
+
+  # FreeBSD implements dlopen in libc
+  if(NOT CMAKE_SYSTEM_NAME STREQUAL FreeBSD)
+    target_link_libraries(ilasm
+      dl
+    )
+  endif(NOT CMAKE_SYSTEM_NAME STREQUAL FreeBSD)
+
 else()
   target_link_libraries(ilasm
-      ${ILASM_LINK_LIBRARIES}
-      coreclr
-      msvcrt
-      ole32
-      oleaut32
-      shell32
+    ${ILASM_LINK_LIBRARIES}
+    coreclr
+    msvcrt
+    ole32
+    oleaut32
+    shell32
   )
 
   install (FILES ${CMAKE_CURRENT_BINARY_DIR}/$<CONFIG>/ilasm.pdb DESTINATION PDB)
diff --git a/src/ilasm/asmenum.h b/src/ilasm/asmenum.h
index b8bd49966e..8dd4318cb5 100644
--- a/src/ilasm/asmenum.h
+++ b/src/ilasm/asmenum.h
@@ -9,14 +9,14 @@
 
 typedef struct
 {
-    char *  pszName;
-    OPCODE  op;
+    const char * pszName;
+    OPCODE       op;
 
-    BYTE    Type;   // Inline0 etc.
+    BYTE         Type;   // Inline0 etc.
 
-    BYTE    Len;    // std mapping
-    BYTE    Std1;
-    BYTE    Std2;
+    BYTE         Len;    // std mapping
+    BYTE         Std1;
+    BYTE         Std2;
 } opcodeinfo_t;
 
 #ifdef DECLARE_DATA
diff --git a/src/ilasm/asmman.cpp b/src/ilasm/asmman.cpp
index 4933cf1f5c..c457adddc9 100644
--- a/src/ilasm/asmman.cpp
+++ b/src/ilasm/asmman.cpp
@@ -115,7 +115,7 @@ mdToken             AsmMan::GetComTypeTokByName(
     return(tmp ? tmp->tkTok : mdExportedTypeNil);
 }
 
-AsmManAssembly*     AsmMan::GetAsmRefByName(__in __nullterminated char* szAsmRefName)
+AsmManAssembly*     AsmMan::GetAsmRefByName(__in __nullterminated const char* szAsmRefName)
 {
     AsmManAssembly* ret = NULL;
     if(szAsmRefName)
@@ -130,7 +130,7 @@ AsmManAssembly*     AsmMan::GetAsmRefByName(__in __nullterminated char* szAsmRef
     }
     return ret;
 }
-mdToken             AsmMan::GetAsmRefTokByName(__in __nullterminated char* szAsmRefName)
+mdToken             AsmMan::GetAsmRefTokByName(__in __nullterminated const char* szAsmRefName)
 {
     AsmManAssembly* tmp = GetAsmRefByName(szAsmRefName);
     return(tmp ? tmp->tkTok : mdAssemblyRefNil);
@@ -155,7 +155,7 @@ void    AsmMan::SetModuleName(__inout_opt __nullterminated char* szName)
 }
 //==============================================================================================================
 // Borrowed from VM\assembly.cpp
-
+#ifndef FEATURE_CORECLR
 HRESULT GetHash(__in LPWSTR moduleName,
                           ALG_ID iHashAlg,
                           BYTE** pbCurrentValue,  // should be NULL
@@ -224,6 +224,7 @@ HRESULT GetHash(__in LPWSTR moduleName,
 
     return hr;
 }
+#endif // !FEATURE_CORECLR
 //==============================================================================================================
 
 void    AsmMan::AddFile(__in __nullterminated char* szName, DWORD dwAttr, BinStr* pHashBlob)
@@ -277,15 +278,18 @@ void    AsmMan::EmitFiles()
             if(m_pAssembly      // and assembly is defined
                 && m_pAssembly->ulHashAlgorithm) // and hash algorithm is defined...
             { // then try to compute it
-                if(FAILED(GetHash(wzUniBuf,(ALG_ID)(m_pAssembly->ulHashAlgorithm),&pHash,&cbHash)))
+#ifndef FEATURE_CORECLR
+                if(SUCCEEDED(GetHash(wzUniBuf,(ALG_ID)(m_pAssembly->ulHashAlgorithm),&pHash,&cbHash)))
                 {
-                    pHash = NULL;
-                    cbHash = 0;
+                    tmp->pHash = new BinStr(pHash,cbHash);
                 }
                 else
+#else
                 {
-                    tmp->pHash = new BinStr(pHash,cbHash);
+                    pHash = NULL;
+                    cbHash = 0;
                 }
+#endif // !FEATURE_CORECLR
             }
         }
         else 
diff --git a/src/ilasm/asmman.hpp b/src/ilasm/asmman.hpp
index bf1a3fe0c7..31e73b743b 100644
--- a/src/ilasm/asmman.hpp
+++ b/src/ilasm/asmman.hpp
@@ -207,7 +207,7 @@ class AsmMan
     void*               m_pAssembler;
     
     AsmManFile*         GetFileByName(__in __nullterminated char* szFileName);
-    AsmManAssembly*     GetAsmRefByName(__in __nullterminated char* szAsmRefName);
+    AsmManAssembly*     GetAsmRefByName(__in __nullterminated const char* szAsmRefName);
     AsmManComType*      GetComTypeByName(__in_opt __nullterminated char* szComTypeName,
                                          __in_opt __nullterminated char* szComEnclosingTypeName = NULL);
     mdToken             GetComTypeTokByName(__in_opt __nullterminated char* szComTypeName,
@@ -284,8 +284,8 @@ public:
     void    SetManifestResAsmRef(__in __nullterminated char* szAsmRefName);
 
     mdToken             GetFileTokByName(__in __nullterminated char* szFileName);
-    mdToken             GetAsmRefTokByName(__in __nullterminated char* szAsmRefName);
-    mdToken             GetAsmTokByName(__in __nullterminated char* szAsmName) 
+    mdToken             GetAsmRefTokByName(__in __nullterminated const char* szAsmRefName);
+    mdToken             GetAsmTokByName(__in __nullterminated const char* szAsmName)
         { return (m_pAssembly && (strcmp(m_pAssembly->szName,szAsmName)==0)) ? m_pAssembly->tkTok : 0; };
 
     mdToken GetModuleRefTokByName(__in __nullterminated char* szName)
diff --git a/src/ilasm/asmparse.h b/src/ilasm/asmparse.h
index 9c1ced273e..2f9cf21bc5 100644
--- a/src/ilasm/asmparse.h
+++ b/src/ilasm/asmparse.h
@@ -71,7 +71,7 @@ public:
 
     const WCHAR* namew()
     {
-        return L"local_define";
+        return W("local_define");
     }
 
     BOOL IsValid()
@@ -305,7 +305,7 @@ private:
 	HANDLE	hstderr;
 
 private:
-	friend void yyerror(__in __nullterminated char* str);
+    friend void yyerror(__in __nullterminated const char* str);
     friend int parse_literal(unsigned curSym, __inout __nullterminated char* &curPos, BOOL translate_escapes);
     friend int yyparse();
     friend int yylex();
diff --git a/src/ilasm/assem.cpp b/src/ilasm/assem.cpp
index 938cbaa1bd..f06320eda5 100644
--- a/src/ilasm/assem.cpp
+++ b/src/ilasm/assem.cpp
@@ -16,9 +16,15 @@
 #define DECLARE_DATA
 
 #include "assembler.h"
-#ifndef FEATURE_CORECLR
+#ifdef FEATURE_CORECLR
+#ifdef FEATURE_PAL
+#include "coreclrloader.h"
+CoreCLRLoader *g_loader;
+#endif // FEATURE_PAL
+MetaDataGetDispenserFunc metaDataGetDispenser;
+#else
 #include "MscorpeSxS.h"
-#endif
+#endif // FEATURE_CORECLR
 
 void indexKeywords(Indx* indx); // defined in asmparse.y
 
@@ -232,20 +238,38 @@ Assembler::~Assembler()
         m_pDisp = NULL;
     }
 
+#ifdef FEATURE_CORECLR
+#ifdef FEATURE_PAL
+    if (g_loader != NULL)
+    {
+        g_loader->Finish();
+    }
+#endif
+#else
     if (m_fDidCoInitialise)
         CoUninitialize();
+#endif // FEATURE_CORECLR
 
 }
 
 
 BOOL Assembler::Init()
 {
+#ifdef FEATURE_CORECLR
+#ifdef FEATURE_PAL
+    g_loader = CoreCLRLoader::Create(g_pszExeFile);
+    metaDataGetDispenser = (MetaDataGetDispenserFunc)g_loader->LoadFunction("MetaDataGetDispenser");
+#else
+    metaDataGetDispenser = (MetaDataGetDispenserFunc)MetaDataGetDispenser;
+#endif // FEATURE_PAL
+#else
     if(!m_fDidCoInitialise)
     {
         if (FAILED(CoInitializeEx(NULL, COINIT_MULTITHREADED)))
             return FALSE;
         m_fDidCoInitialise = TRUE;
     }
+#endif // FEATURE_CORECLR
     if (m_pCeeFileGen != NULL) {
         if (m_pCeeFile)
             m_pCeeFileGen->DestroyCeeFile(&m_pCeeFile);
@@ -804,7 +828,7 @@ BOOL Assembler::EmitMethod(Method *pMethod)
 
     if(IsMdPrivateScope(pMethod->m_Attr))
     {
-        WCHAR* p = wcsstr(wzMemberName,L"$PST06");
+        WCHAR* p = wcsstr(wzMemberName,W("$PST06"));
         if(p) *p = 0;
     }
 
@@ -832,7 +856,7 @@ BOOL Assembler::EmitMethod(Method *pMethod)
         {
             mdToken tkPseudoCtor;
             BYTE bSig[3] = {IMAGE_CEE_CS_CALLCONV_HASTHIS,0,ELEMENT_TYPE_VOID};
-            if(FAILED(m_pEmitter->DefineMemberRef(tkPseudoClass, L".ctor", (PCCOR_SIGNATURE)bSig, 3, &tkPseudoCtor)))
+            if(FAILED(m_pEmitter->DefineMemberRef(tkPseudoClass, W(".ctor"), (PCCOR_SIGNATURE)bSig, 3, &tkPseudoCtor)))
                 report->error("Unable to define member reference '%s::.ctor'\n", COR_REQUIRES_SECOBJ_ATTRIBUTE_ANSI);
             else DefineCV(new CustomDescr(MethodToken,tkPseudoCtor,NULL));
         }
@@ -1144,7 +1168,7 @@ BOOL Assembler::EmitProp(PropDescriptor* pPD)
     return TRUE;
 }
 
-Class *Assembler::FindCreateClass(__in __nullterminated char *pszFQN)
+Class *Assembler::FindCreateClass(__in __nullterminated const char *pszFQN)
 {
     Class *pSearch = NULL;
 
@@ -1216,7 +1240,7 @@ BOOL Assembler::EmitClass(Class *pClass)
     L = wcslen(wzFullName);
     if((L==0)||(wzFullName[L-1]==L'.')) // Missing class name!
     {
-        wcscat_s(wzFullName,dwUniBuf,L"$UNNAMED_TYPE$");
+        wcscat_s(wzFullName,dwUniBuf,W("$UNNAMED_TYPE$"));
     }
 
     pClass->m_Attr = CheckClassFlagsIfNested(pClass->m_pEncloser, pClass->m_Attr);
diff --git a/src/ilasm/assembler.cpp b/src/ilasm/assembler.cpp
index d83bf7ce2b..275b721f36 100644
--- a/src/ilasm/assembler.cpp
+++ b/src/ilasm/assembler.cpp
@@ -93,7 +93,7 @@ void    Assembler::ClearBoundList(void)
     m_TyParList = NULL;
 }
 /**************************************************************************/
-mdToken Assembler::ResolveClassRef(mdToken tkResScope, __in __nullterminated char *pszFullClassName, Class** ppClass)
+mdToken Assembler::ResolveClassRef(mdToken tkResScope, __in __nullterminated const char *pszFullClassName, Class** ppClass)
 {
     Class *pClass = NULL;
     mdToken tkRet = mdTokenNil;
@@ -167,11 +167,11 @@ private:
     mdToken token_;
 public:
     // Constructor for a 'lookup' object
-    TypeSpecContainer(BinStr *typeSpec) : 
-        len_(typeSpec->length()), 
-        hash_(typeSpec->length()), 
-        token_(mdTokenNil), 
-        ptr_(typeSpec->ptr())
+    TypeSpecContainer(BinStr *typeSpec) :
+        ptr_(typeSpec->ptr()),
+        len_(typeSpec->length()),
+        hash_(typeSpec->length()),
+        token_(mdTokenNil)
     {        
         for (unsigned i = 0; i < len_; i++)
             hash_ = (hash_ * 257) ^ ((i + 1) * (ptr_[i] ^ 0xA5));
@@ -179,10 +179,10 @@ public:
     // Constructor for a 'permanent' object
     // Don't bother re-hashing, since we will always have already constructed the lookup object
     TypeSpecContainer(const TypeSpecContainer &t, mdToken tk) : 
-        len_(t.len_), 
+        ptr_(new unsigned __int8[t.len_]),
+        len_(t.len_),
         hash_(t.hash_),
-        token_(tk), 
-        ptr_(new unsigned __int8[t.len_])
+        token_(tk)
     {
         _ASSERT(tk != mdTokenNil);
         _ASSERT(t.token_ == mdTokenNil);
@@ -252,7 +252,7 @@ mdToken Assembler::ResolveTypeSpec(BinStr* typeSpec)
 }
 
 /**************************************************************************/
-mdToken Assembler::GetAsmRef(__in __nullterminated char* szName)
+mdToken Assembler::GetAsmRef(__in __nullterminated const char* szName)
 {
     mdToken tkResScope = 0;
     if(strcmp(szName,"*")==0) tkResScope = mdTokenNil;
@@ -938,7 +938,7 @@ BOOL Assembler::EmitField(FieldDescriptor* pFD)
     WszMultiByteToWideChar(g_uCodePage,0,pFD->m_szName,-1,wzFieldName,dwUniBuf); //int)cFieldNameLength);
     if(IsFdPrivateScope(pFD->m_dwAttr))
     {
-        WCHAR* p = wcsstr(wzFieldName,L"$PST04");
+        WCHAR* p = wcsstr(wzFieldName,W("$PST04"));
         if(p) *p = 0;
     }
 
@@ -2020,7 +2020,7 @@ void Assembler::EmitInstrStringLiteral(Instr* instr, BinStr* literal, BOOL Conve
         L = UnicodeString ? WszMultiByteToWideChar(g_uCodePage,0,(char*)pb,-1,UnicodeString,DataLen+1) : 0;
         if(L == 0)
         {
-            char* sz=NULL;
+            const char* sz=NULL;
             DWORD dw;
             switch(dw=GetLastError())
             {
diff --git a/src/ilasm/Assembler.h b/src/ilasm/assembler.h
index 8b9b414e8c..8f3a71e7cc 100644
--- a/src/ilasm/Assembler.h
+++ b/src/ilasm/assembler.h
@@ -51,6 +51,19 @@
 #define NESTING_SEP     ((char)0xF8)
 
 #define dwUniBuf 16384
+
+#ifdef FEATURE_PAL
+#include "coreclrloader.h"
+extern CoreCLRLoader *g_loader;
+extern char *g_pszExeFile;
+#endif
+typedef int(*MetaDataGetDispenserFunc) (
+    REFCLSID    rclsid,                 // The class to desired.
+    REFIID      riid,                   // Interface wanted on class factory.
+    LPVOID FAR  *ppv);                  // Return interface pointer here.
+
+extern MetaDataGetDispenserFunc metaDataGetDispenser;
+
 extern WCHAR   wzUniBuf[]; // Unicode conversion global buffer (assem.cpp)
 
 class Class;
@@ -776,13 +789,13 @@ public:
     HRESULT CreateTLSDirectory();
     HRESULT CreateDebugDirectory();
     HRESULT InitMetaData();
-    Class *FindCreateClass(__in __nullterminated char *pszFQN);
+    Class *FindCreateClass(__in __nullterminated const char *pszFQN);
     BOOL EmitFieldRef(__in_z __in char *pszArg, int opcode);
     BOOL EmitSwitchData(__in_z __in char *pszArg);
-    mdToken ResolveClassRef(mdToken tkResScope, __in __nullterminated char *pszClassName, Class** ppClass);
+    mdToken ResolveClassRef(mdToken tkResScope, __in __nullterminated const char *pszClassName, Class** ppClass);
     mdToken ResolveTypeSpec(BinStr* typeSpec);
     mdToken GetBaseAsmRef();
-    mdToken GetAsmRef(__in __nullterminated char* szName);
+    mdToken GetAsmRef(__in __nullterminated const char* szName);
     mdToken GetModRef(__in __nullterminated char* szName);
     mdToken GetInterfaceImpl(mdToken tsClass, mdToken tsInterface);
     char* ReflectionNotation(mdToken tk);
diff --git a/src/ilasm/grammar_after.cpp b/src/ilasm/grammar_after.cpp
index 8fe93dab4b..d0271a64e1 100644
--- a/src/ilasm/grammar_after.cpp
+++ b/src/ilasm/grammar_after.cpp
@@ -6,6 +6,7 @@
 /* Code goes here */
 
 /********************************************************************************/
+extern int yyparse();
 
 struct Keywords {
     const char* name;
@@ -204,7 +205,7 @@ char* yygetline(int Line)
     return buff;
 }
 
-void yyerror(__in __nullterminated char* str) {
+void yyerror(__in __nullterminated const char* str) {
     char tokBuff[64];
     WCHAR *wzfile = (WCHAR*)(PENV->in->namew());
     int iline = PENV->curLine;
@@ -1174,7 +1175,7 @@ Just_A_Character:
 #endif
 
 /**************************************************************************/
-static char* newString(__in __nullterminated char* str1) 
+static char* newString(__in __nullterminated const char* str1)
 {
     char* ret = new char[strlen(str1)+1];
     if(ret) strcpy_s(ret, strlen(str1)+1, str1);
diff --git a/src/ilasm/grammar_before.cpp b/src/ilasm/grammar_before.cpp
index 60d6b57b3b..c6b238813d 100644
--- a/src/ilasm/grammar_before.cpp
+++ b/src/ilasm/grammar_before.cpp
@@ -11,6 +11,7 @@
 #endif
 
 #define YYMAXDEPTH 0x80000
+#define YYLOCAL int
 //#define YYRECURSIVE
 
 //#define DEBUG_PARSING
@@ -60,7 +61,7 @@ void SetFunctionPtrs()
 #endif    
 
 static char* newStringWDel(__in __nullterminated char* str1, char delimiter, __in __nullterminated char* str3 = 0);
-static char* newString(__in __nullterminated char* str1);
+static char* newString(__in __nullterminated const char* str1);
 static void corEmitInt(BinStr* buff, unsigned data);
 static void AppendStringWithLength(BinStr* pbs, __in __nullterminated char* sz);
 bool bParsingByteArray = FALSE;
diff --git a/src/ilasm/main.cpp b/src/ilasm/main.cpp
index 978f827188..18142e3f9f 100644
--- a/src/ilasm/main.cpp
+++ b/src/ilasm/main.cpp
@@ -14,6 +14,7 @@
 #include "shimload.h"
 
 #include "strsafe.h"
+#define ASSERTE_ALL_BUILDS(expr) _ASSERTE_ALL_BUILDS(__FILE__, (expr))
 
 WCHAR* EqualOrColon(__in __nullterminated WCHAR* szArg)
 {
@@ -30,6 +31,9 @@ static DWORD    g_dwSubsystem=(DWORD)-1,g_dwComImageFlags=(DWORD)-1,g_dwFileAlig
 static ULONGLONG   g_stBaseAddress=0;
 static size_t   g_stSizeOfStackReserve=0;
 extern unsigned int g_uConsoleCP;
+#ifdef FEATURE_PAL
+char * g_pszExeFile;
+#endif
 
 void MakeTestFile(__in __nullterminated char* szFileName)
 {
@@ -66,7 +70,7 @@ void MakeProperSourceFileName(__in __nullterminated WCHAR* wzOrigName,
         if(wzProperName[j] == '.') break;
         if((wzProperName[j] == '\\')||(j == 0))
         {
-            wcscat_s(wzProperName,MAX_FILENAME_LENGTH,L".il");
+            wcscat_s(wzProperName,MAX_FILENAME_LENGTH,W(".il"));
             break;
         }
     }
@@ -98,6 +102,7 @@ WCHAR       wzIncludePathBuffer[MAX_FILENAME_LENGTH];
 #pragma warning(push)
 #pragma warning(disable:21000) // Suppress PREFast warning about overly large function
 #endif
+
 extern "C" int _cdecl wmain(int argc, __in WCHAR **argv)
 {
     int         i, NumFiles = 0, NumDeltaFiles = 0;
@@ -139,7 +144,7 @@ extern "C" int _cdecl wmain(int argc, __in WCHAR **argv)
 #pragma warning(push)
 #pragma warning(disable:26000) // "Suppress prefast warning about index overflow"
 #endif
-    if (! wcscmp(argv[1], L"/?") || ! wcscmp(argv[1],L"-?"))
+    if (! wcscmp(argv[1], W("/?")) || ! wcscmp(argv[1],W("-?")))
 #ifdef _PREFAST_
 #pragma warning(pop)
 #endif    
@@ -203,8 +208,8 @@ extern "C" int _cdecl wmain(int argc, __in WCHAR **argv)
     }
 
     uCodePage = CP_UTF8;
-    WszSetEnvironmentVariable(L"COMP_ENC_OPENSCOPE", L"");
-    WszSetEnvironmentVariable(L"COMP_ENC_EMIT", L"");
+    WszSetEnvironmentVariable(W("COMP_ENC_OPENSCOPE"), W(""));
+    WszSetEnvironmentVariable(W("COMP_ENC_EMIT"), W(""));
     if((pAsm = new Assembler()))
     {
         pAsm->SetCodePage(uCodePage);
@@ -214,7 +219,11 @@ extern "C" int _cdecl wmain(int argc, __in WCHAR **argv)
             //-------------------------------------------------
             for (i = 1; i < argc; i++)
             {
+#ifdef FEATURE_PAL
+                if(argv[i][0] == L'-')
+#else
                 if((argv[i][0] == L'/') || (argv[i][0] == L'-'))
+#endif
                 {
                     memset(szOpt,0,sizeof(szOpt));
                     WszWideCharToMultiByte(uCodePage,0,&argv[i][1],-1,szOpt,sizeof(szOpt),NULL,NULL);
@@ -240,7 +249,11 @@ extern "C" int _cdecl wmain(int argc, __in WCHAR **argv)
                     else if (!_stricmp(szOpt, "DEB"))
                     {
                       pAsm->m_dwIncludeDebugInfo = 0x101;
+#ifdef FEATURE_CORECLR
+                      printf("Warning: PDB is ignored under 'DEB' option for ilasm on CoreCLR.\n");
+#else
                       pAsm->m_fGeneratePDB = TRUE;
+#endif
                       bNoDebug = FALSE;
 
                       WCHAR *pStr = EqualOrColon(argv[i]);
@@ -253,13 +266,13 @@ extern "C" int _cdecl wmain(int argc, __in WCHAR **argv)
                               WCHAR wzSubOpt[8];
                               wcsncpy_s(wzSubOpt,8,pStr,3);
                               wzSubOpt[3] = 0;
-                              if(0 == _wcsicmp(wzSubOpt,L"OPT"))
+                              if(0 == _wcsicmp(wzSubOpt,W("OPT")))
                                 pAsm->m_dwIncludeDebugInfo = 0x3;
-                              else if(0 == _wcsicmp(wzSubOpt,L"IMP"))
+                              else if(0 == _wcsicmp(wzSubOpt,W("IMP")))
                                 pAsm->m_dwIncludeDebugInfo = 0x103;
                               else 
                               {
-                                WCHAR *pFmt =((*pStr == '0')&&(*(pStr+1) == 'x'))? L"%lx" : L"%ld";
+                                const WCHAR *pFmt =((*pStr == '0')&&(*(pStr+1) == 'x'))? W("%lx") : W("%ld");
                                 if(swscanf_s(pStr,pFmt,&(pAsm->m_dwIncludeDebugInfo))!=1)
                                 goto InvalidOption; // bad subooption
                               }
@@ -268,7 +281,11 @@ extern "C" int _cdecl wmain(int argc, __in WCHAR **argv)
                     }
                     else if (!_stricmp(szOpt, "PDB"))
                     {
+#ifdef FEATURE_CORECLR
+                      printf("Warning: 'PDB' option is ignored for ilasm on CoreCLR.\n");
+#else
                       pAsm->m_fGeneratePDB = TRUE;
+#endif
                       bNoDebug = FALSE;
                     }
                     else if (!_stricmp(szOpt, "CLO"))
@@ -406,7 +423,7 @@ extern "C" int _cdecl wmain(int argc, __in WCHAR **argv)
                         if(wcslen(pStr)==0) goto InvalidOption; //if no version
                         {
                             int major=-1,minor=-1;
-                            if(swscanf_s(pStr,L"%d.%d",&major, &minor)==2)
+                            if(swscanf_s(pStr,W("%d.%d"),&major, &minor)==2)
                             {
                                 if((major >= 0)&&(major < 0xFF))
                                     pAsm->m_wMSVmajor = (WORD)major;
@@ -429,7 +446,7 @@ extern "C" int _cdecl wmain(int argc, __in WCHAR **argv)
                         WCHAR *pStr = EqualOrColon(argv[i]);
                         if(pStr == NULL) goto InvalidOption;
                         pStr++;
-                        WCHAR *pFmt = ((*pStr=='0')&&(*(pStr+1) == 'x'))? L"%lx" : L"%ld";
+                        const WCHAR *pFmt = ((*pStr=='0')&&(*(pStr+1) == 'x'))? W("%lx") : W("%ld");
                         if(swscanf_s(pStr,pFmt,&g_dwSubsystem)!=1) goto InvalidOption;
                     }
                     else if (!_stricmp(szOpt, "SSV"))
@@ -440,7 +457,7 @@ extern "C" int _cdecl wmain(int argc, __in WCHAR **argv)
                         if(wcslen(pStr)==0) goto InvalidOption; //if no version
                         {
                             int major=-1,minor=-1;
-                            if(swscanf_s(pStr,L"%d.%d",&major, &minor)==2)
+                            if(swscanf_s(pStr,W("%d.%d"),&major, &minor)==2)
                             {
                                 if((major >= 0)&&(major < 0xFFFF))
                                     pAsm->m_wSSVersionMajor = (WORD)major;
@@ -455,7 +472,7 @@ extern "C" int _cdecl wmain(int argc, __in WCHAR **argv)
                         WCHAR *pStr = EqualOrColon(argv[i]);
                         if(pStr == NULL) goto InvalidOption;
                         pStr++;
-                        WCHAR *pFmt = ((*pStr=='0')&&(*(pStr+1) == 'x'))? L"%lx" : L"%ld";
+                        const WCHAR *pFmt = ((*pStr=='0')&&(*(pStr+1) == 'x'))? W("%lx") : W("%ld");
                         if(swscanf_s(pStr,pFmt,&g_dwFileAlignment)!=1) goto InvalidOption;
                         if((g_dwFileAlignment & (g_dwFileAlignment-1))
                            || (g_dwFileAlignment < 0x200) || (g_dwFileAlignment > 0x10000))
@@ -469,7 +486,7 @@ extern "C" int _cdecl wmain(int argc, __in WCHAR **argv)
                         WCHAR *pStr = EqualOrColon(argv[i]);
                         if(pStr == NULL) goto InvalidOption;
                         pStr++;
-                        WCHAR *pFmt = ((*pStr=='0')&&(*(pStr+1) == 'x'))? L"%lx" : L"%ld";
+                        const WCHAR *pFmt = ((*pStr=='0')&&(*(pStr+1) == 'x'))? W("%lx") : W("%ld");
                         if(swscanf_s(pStr,pFmt,&g_dwComImageFlags)!=1) goto InvalidOption;
                     }
                     else if (!_stricmp(szOpt, "BAS"))
@@ -477,7 +494,7 @@ extern "C" int _cdecl wmain(int argc, __in WCHAR **argv)
                         WCHAR *pStr = EqualOrColon(argv[i]);
                         if(pStr == NULL) goto InvalidOption;
                         pStr++;
-                        WCHAR *pFmt = ((*pStr=='0')&&(*(pStr+1) == 'x'))? L"%I64x" : L"%I64d";
+                        const WCHAR *pFmt = ((*pStr=='0')&&(*(pStr+1) == 'x'))? W("%I64x") : W("%I64d");
                         if(swscanf_s(pStr,pFmt,&g_stBaseAddress)!=1) goto InvalidOption;
                         if(g_stBaseAddress & 0xFFFF)
                         {
@@ -490,7 +507,7 @@ extern "C" int _cdecl wmain(int argc, __in WCHAR **argv)
                         WCHAR *pStr = EqualOrColon(argv[i]);
                         if(pStr == NULL) goto InvalidOption;
                         pStr++;
-                        WCHAR *pFmt = ((*pStr=='0')&&(*(pStr+1) == 'x'))? L"%lx" : L"%ld";
+                        const WCHAR *pFmt = ((*pStr=='0')&&(*(pStr+1) == 'x'))? W("%lx") : W("%ld");
                         if(swscanf_s(pStr,pFmt,&g_stSizeOfStackReserve)!=1) goto InvalidOption;
                     }
 #ifdef _SPECIAL_INTERNAL_USE_ONLY
@@ -606,11 +623,11 @@ extern "C" int _cdecl wmain(int argc, __in WCHAR **argv)
                     }
                 }
                 while(j);
-                wcscat_s(wzOutputFilename, MAX_FILENAME_LENGTH,(IsDLL ? L".dll" : (IsOBJ ? L".obj" : L".exe")));
+                wcscat_s(wzOutputFilename, MAX_FILENAME_LENGTH,(IsDLL ? W(".dll") : (IsOBJ ? W(".obj") : W(".exe"))));
             }
             if(wzIncludePath == NULL)
             {
-                if(0!=WszGetEnvironmentVariable(L"ILASM_INCLUDE",wzIncludePathBuffer,MAX_FILENAME_LENGTH))
+                if(0!=WszGetEnvironmentVariable(W("ILASM_INCLUDE"),wzIncludePathBuffer,MAX_FILENAME_LENGTH))
                     wzIncludePath = wzIncludePathBuffer;
             }
             //------------ Assembler initialization done. Now, to business -----------------------
@@ -672,6 +689,7 @@ extern "C" int _cdecl wmain(int argc, __in WCHAR **argv)
                         }
                         else
                         {
+#ifndef FEATURE_PAL
                             DWORD dwBinType;
                             if(GetBinaryTypeA(szInputFilename,&dwBinType))
                             {
@@ -679,6 +697,7 @@ extern "C" int _cdecl wmain(int argc, __in WCHAR **argv)
                                 fAllFilesPresent = FALSE;
                             }
                             else
+#endif
                             {
                                 pAsm->SetSourceFileName(FullFileName(wzInputFilename,uCodePage)); // deletes the argument!
 
@@ -745,7 +764,7 @@ extern "C" int _cdecl wmain(int argc, __in WCHAR **argv)
                                     {
                                         wcscpy_s(wzNewOutputFilename,MAX_FILENAME_LENGTH+16,wzOutputFilename);
                                         exitval = (int)StringCchPrintfW(&wzNewOutputFilename[wcslen(wzNewOutputFilename)], 32,
-                                                 L".%d",iFile+1);
+                                                 W(".%d"),iFile+1);
                                         MakeProperSourceFileName(pwzDeltaFiles[iFile], uCodePage, wzInputFilename, szInputFilename);
                                         if(pAsm->m_fReportProgress)
                                         {
@@ -770,6 +789,7 @@ extern "C" int _cdecl wmain(int argc, __in WCHAR **argv)
                                         }
                                         else
                                         {
+#ifndef FEATURE_PAL
                                             DWORD dwBinType;
                                             if(GetBinaryTypeA(szInputFilename,&dwBinType))
                                             {
@@ -777,6 +797,7 @@ extern "C" int _cdecl wmain(int argc, __in WCHAR **argv)
                                                 fAllFilesPresent = FALSE;
                                             }
                                             else
+#endif
                                             if (SUCCEEDED(pAsm->InitMetaDataForENC(wzNewOutputFilename)))
                                             {
                                                 pAsm->SetSourceFileName(FullFileName(wzInputFilename,uCodePage)); // deletes the argument!
@@ -847,8 +868,8 @@ extern "C" int _cdecl wmain(int argc, __in WCHAR **argv)
     }
     else printf("Insufficient memory\n");
 
-    WszSetEnvironmentVariable(L"COMP_ENC_OPENSCOPE", L"");
-    WszSetEnvironmentVariable(L"COMP_ENC_EMIT", L"");
+    WszSetEnvironmentVariable(W("COMP_ENC_OPENSCOPE"), W(""));
+    WszSetEnvironmentVariable(W("COMP_ENC_EMIT"), W(""));
 
     if(exitval || bNoDebug)
     {
@@ -859,7 +880,7 @@ extern "C" int _cdecl wmain(int argc, __in WCHAR **argv)
             pc = &wzOutputFilename[wcslen(wzOutputFilename)];
             *pc = L'.';
         }
-        wcscpy_s(pc+1,4,L"PDB");
+        wcscpy_s(pc+1,4,W("PDB"));
 #undef DeleteFileW
         DeleteFileW(wzOutputFilename);
     }
@@ -896,11 +917,45 @@ extern "C" int _cdecl wmain(int argc, __in WCHAR **argv)
 #pragma warning(pop)
 #endif
 
-
+#ifndef FEATURE_CORECLR
 HINSTANCE GetModuleInst()
 {
     return (NULL);
 }
+#endif // !FEATURE_CORECLR
 
+#ifdef FEATURE_PAL
+int main(int argc, char* str[])
+{
+    g_pszExeFile = str[0];
+    if (0 != PAL_Initialize(argc, str))
+    {
+        fprintf(stderr,"Error: Fail to PAL_Initialize\n");
+        exit(1);
+    }
+
+    WCHAR **argv = new WCHAR*[argc];
+    for (int i = 0; i < argc; i++) {
+        int length = MultiByteToWideChar(CP_ACP, 0, str[i], -1, NULL, 0);
+        ASSERTE_ALL_BUILDS(length != 0);
 
+        LPWSTR result = new (nothrow) WCHAR[length];
+        ASSERTE_ALL_BUILDS(result != NULL);
+
+        length = MultiByteToWideChar(CP_ACP, 0, str[i], -1, result, length);
+        ASSERTE_ALL_BUILDS (length != 0);
+
+        argv[i] = result;
+    }
+
+    int ret = wmain(argc, argv);
+
+    for (int i = 0 ; i < argc; i++) {
+        delete[] argv[i];
+    }
+    delete[] argv;
+
+    return ret;
+}
+#endif // FEATURE_PAL
 
diff --git a/src/ilasm/writer.cpp b/src/ilasm/writer.cpp
index 1b1056213a..542b2fd3c3 100644
--- a/src/ilasm/writer.cpp
+++ b/src/ilasm/writer.cpp
@@ -36,7 +36,7 @@ HRESULT Assembler::InitMetaData()
     if(bClock) bClock->cMDInitBegin = GetTickCount();
 
 #ifdef FEATURE_CORECLR
-    hr = MetaDataGetDispenser(CLSID_CorMetaDataDispenser,
+    hr = metaDataGetDispenser(CLSID_CorMetaDataDispenser,
         IID_IMetaDataDispenserEx, (void **)&m_pDisp);
 #else
     hr = LegacyActivationShim::ClrCoCreateInstance(
@@ -67,6 +67,7 @@ HRESULT Assembler::InitMetaData()
     if(FAILED(hr = m_pEmitter->QueryInterface(IID_IMetaDataImport2, (void**)&m_pImporter)))
         goto exit;
 
+#ifndef FEATURE_CORECLR
     hr = CoCreateInstance(CLSID_CorSymWriter_SxS,
                            NULL,
                            CLSCTX_INPROC_SERVER,
@@ -84,6 +85,7 @@ HRESULT Assembler::InitMetaData()
         fprintf(stderr, "Error: QueryInterface(IID_ISymUnmanagedWriter) returns %X\n",hr);
         m_pSymWriter = NULL;
     }
+#endif // !FEATURE_CORECLR
 
     //m_Parser = new AsmParse(m_pEmitter);
     m_fInitialisedMetaData = TRUE;
@@ -231,6 +233,9 @@ HRESULT Assembler::CreateTLSDirectory() {
 HRESULT Assembler::CreateDebugDirectory()
 {
     HRESULT hr = S_OK;
+    HCEESECTION sec = m_pILSection;
+    BYTE *de;
+    ULONG deOffset;
 
     // Only emit this if we're also emitting debug info.
     if (!(m_fGeneratePDB && m_pSymWriter))
@@ -281,9 +286,6 @@ HRESULT Assembler::CreateDebugDirectory()
     // Note that UpdateResource doesn't work correctly if the debug directory is
     // in the data section.  So instead we put it in the text section (same as
     // cs compiler).
-    HCEESECTION sec = m_pILSection;//m_pGlobalDataSection;
-    BYTE *de;
-
     if (FAILED(hr = m_pCeeFileGen->GetSectionBlock(sec,
                                                    sizeof(debugDirIDD) +
                                                    param.debugDirDataSize,
@@ -292,7 +294,6 @@ HRESULT Assembler::CreateDebugDirectory()
         goto ErrExit;
 
     // Where did we get that memory?
-    ULONG deOffset;
     if (FAILED(hr = m_pCeeFileGen->GetSectionDataLen(sec,
                                                      &deOffset)))
         goto ErrExit;
@@ -1026,7 +1027,7 @@ HRESULT Assembler::ResolveLocalMemberRefs()
 
                             if(IsMdPrivateScope(pListMD->m_Attr))
                             {
-                                WCHAR* p = wcsstr(wzUniBuf,L"$PST06");
+                                WCHAR* p = wcsstr(wzUniBuf,W("$PST06"));
                                 if(p) *p = 0;
                             }
 
@@ -1466,11 +1467,15 @@ HRESULT Assembler::CreatePEFile(__in __nullterminated WCHAR *pwzOutputFilename)
 
     if(m_wzResourceFile)
     {
+#ifdef FEATURE_PAL
+        report->msg("Warning: The Win32 resource file '%S' is ignored and not emitted on xPlatform.\n", m_wzResourceFile);
+#else
         if (FAILED(hr=m_pCeeFileGen->SetResourceFileName(m_pCeeFile, m_wzResourceFile)))
         {
             report->msg("Warning: failed to set Win32 resource file name '%S', hr=0x%8.8X\n         The Win32 resource is not emitted.\n",
                         m_wzResourceFile, hr);
         }
+#endif
     }
 
     if (FAILED(hr=CreateTLSDirectory())) goto exit;
diff --git a/src/ilasm/writer_enc.cpp b/src/ilasm/writer_enc.cpp
index 79f5245448..d8b87bb88c 100644
--- a/src/ilasm/writer_enc.cpp
+++ b/src/ilasm/writer_enc.cpp
@@ -71,6 +71,7 @@ HRESULT Assembler::InitMetaDataForENC(__in __nullterminated WCHAR* wzOrigFileNam
     if(!Init()) goto exit; // close and re-open CeeFileGen and CeeFile
     hr = S_OK;
 
+#ifndef FEATURE_CORECLR
     hr = CoCreateInstance(CLSID_CorSymWriter_SxS,
                            NULL,
                            CLSCTX_INPROC_SERVER,
@@ -79,7 +80,7 @@ HRESULT Assembler::InitMetaDataForENC(__in __nullterminated WCHAR* wzOrigFileNam
     if(SUCCEEDED(hr))
     {
         WCHAR* pwc = &wzOrigFileName[wcslen(wzOrigFileName)];
-        wcscat_s(wzOrigFileName,MAX_SCOPE_LENGTH,L".pdb");
+        wcscat_s(wzOrigFileName,MAX_SCOPE_LENGTH,W(".pdb"));
         if(m_pSymWriter) m_pSymWriter->Initialize((IUnknown*)m_pEmitter,
                                                   wzOrigFileName,
                                                   NULL,
@@ -91,7 +92,7 @@ HRESULT Assembler::InitMetaDataForENC(__in __nullterminated WCHAR* wzOrigFileNam
         fprintf(stderr, "Error: CoCreateInstance(IID_ISymUnmanagedWriter) returns %X\n",hr);
         m_pSymWriter = NULL;
     }
-
+#endif
 
 exit:
     return hr;
@@ -363,8 +364,8 @@ REPT_STEP
         Class* pClass;
         Method* pMethod;
         FILE* pF = NULL;
-        wcscat_s(pwzOutputFilename,MAX_SCOPE_LENGTH,L".dil");
-        if(_wfopen_s(&pF,pwzOutputFilename,L"wb")==0)
+        wcscat_s(pwzOutputFilename,MAX_SCOPE_LENGTH,W(".dil"));
+        if(_wfopen_s(&pF,pwzOutputFilename,W("wb"))==0)
         {
             int i,j,L=0,M=0;
             BinStr bsOut;
@@ -426,7 +427,7 @@ REPT_STEP
     DWORD metaDataSize; 
     if (FAILED(hr=pENCEmitter->GetDeltaSaveSize(cssAccurate, &metaDataSize))) goto exit;
 
-    wcscat_s(pwzOutputFilename,MAX_SCOPE_LENGTH,L".dmeta");
+    wcscat_s(pwzOutputFilename,MAX_SCOPE_LENGTH,W(".dmeta"));
     pENCEmitter->SaveDelta(pwzOutputFilename,0); // second arg (dwFlags) is not used
     *pEnd = 0;
     pENCEmitter->Release();
diff --git a/src/ildasm/unixcoreclrloader/coreclrloader.h b/src/ildasm/unixcoreclrloader/coreclrloader.h
index 0b1aa481f8..7a938ab808 100644
--- a/src/ildasm/unixcoreclrloader/coreclrloader.h
+++ b/src/ildasm/unixcoreclrloader/coreclrloader.h
@@ -3,6 +3,8 @@
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 //
 
+#ifndef CORECLRLOADER_H
+#define CORECLRLOADER_H
 typedef int (*InitializeCoreCLRFunction)(
     const char* exePath,
     const char* appDomainFriendlyName,
@@ -29,4 +31,5 @@ public:
     void* LoadFunction(const char* functionName);
     int Finish();
 };
+#endif // CORECLRLOADER_H
 
diff --git a/src/inc/cor.h b/src/inc/cor.h
index 7ef264d80c..159e7aaf46 100644
--- a/src/inc/cor.h
+++ b/src/inc/cor.h
@@ -2012,7 +2012,7 @@ typedef enum
 // slot on the caller's stack.
 //
 
-#define COR_REQUIRES_SECOBJ_ATTRIBUTE L"System.Security.DynamicSecurityMethodAttribute"
+#define COR_REQUIRES_SECOBJ_ATTRIBUTE W("System.Security.DynamicSecurityMethodAttribute")
 #define COR_REQUIRES_SECOBJ_ATTRIBUTE_ANSI "System.Security.DynamicSecurityMethodAttribute"
 
 #define COR_COMPILERSERVICE_DISCARDABLEATTRIBUTE L"System.Runtime.CompilerServices.DiscardableAttribute"
diff --git a/src/inc/corhdr.h b/src/inc/corhdr.h
index 4ff22db0a6..7a036afd1e 100644
--- a/src/inc/corhdr.h
+++ b/src/inc/corhdr.h
@@ -1703,7 +1703,7 @@ typedef enum CorAttributeTargets
 #define INTEROP_COMIMPORT_TYPE                  "System.Runtime.InteropServices.ComImportAttribute"
 #define INTEROP_COMIMPORT_SIG                   {IMAGE_CEE_CS_CALLCONV_DEFAULT_HASTHIS, 0, ELEMENT_TYPE_VOID}
 
-#define INTEROP_GUID_TYPE_W                     L"System.Runtime.InteropServices.GuidAttribute"
+#define INTEROP_GUID_TYPE_W                     W("System.Runtime.InteropServices.GuidAttribute")
 #define INTEROP_GUID_TYPE                       "System.Runtime.InteropServices.GuidAttribute"
 #define INTEROP_GUID_SIG                        {IMAGE_CEE_CS_CALLCONV_DEFAULT_HASTHIS, 1, ELEMENT_TYPE_VOID, ELEMENT_TYPE_STRING}
 
diff --git a/src/pal/inc/rt/ntimage.h b/src/pal/inc/rt/ntimage.h
index d6c273f794..7bd2faecab 100644
--- a/src/pal/inc/rt/ntimage.h
+++ b/src/pal/inc/rt/ntimage.h
@@ -428,6 +428,7 @@ typedef PIMAGE_NT_HEADERS32                 PIMAGE_NT_HEADERS;
 //      IMAGE_LIBRARY_PROCESS_TERM           0x0002     // Reserved.
 //      IMAGE_LIBRARY_THREAD_INIT            0x0004     // Reserved.
 //      IMAGE_LIBRARY_THREAD_TERM            0x0008     // Reserved.
+#define IMAGE_DLLCHARACTERISTICS_HIGH_ENTROPY_VA 0x0020 // Image can handle a high entropy 64-bit virtual address space.
 #define IMAGE_DLLCHARACTERISTICS_DYNAMIC_BASE 0x0040    // DLL can move
 #define IMAGE_DLLCHARACTERISTICS_NX_COMPAT   0x0100     // Image ix NX compatible
 #define IMAGE_DLLCHARACTERISTICS_NO_SEH       0x0400    // Image does not use SEH.  No SE handler may reside in this image
@@ -796,7 +797,7 @@ typedef struct _IMAGE_RELOCATION {
     union {
         ULONG   VirtualAddress;
         ULONG   RelocCount;             // Set to the real count when IMAGE_SCN_LNK_NRELOC_OVFL is set
-    } u;
+    };
     ULONG   SymbolTableIndex;
     USHORT  Type;
 } IMAGE_RELOCATION;
diff --git a/src/pal/inc/rt/palrt.h b/src/pal/inc/rt/palrt.h
index b983217343..7426d5654f 100644
--- a/src/pal/inc/rt/palrt.h
+++ b/src/pal/inc/rt/palrt.h
@@ -1285,6 +1285,8 @@ typedef HANDLE HWND;
 #define IS_TEXT_UNICODE_SIGNATURE             0x0008
 #define IS_TEXT_UNICODE_UNICODE_MASK          0x000F
 
+BOOL IsTextUnicode(CONST VOID* lpv, int iSize, LPINT lpiResult);
+
 typedef struct _LIST_ENTRY {
    struct _LIST_ENTRY *Flink;
    struct _LIST_ENTRY *Blink;
diff --git a/src/palrt/CMakeLists.txt b/src/palrt/CMakeLists.txt
index a66f148082..bc965db15a 100644
--- a/src/palrt/CMakeLists.txt
+++ b/src/palrt/CMakeLists.txt
@@ -11,6 +11,7 @@ set(PALRT_SOURCES
     memorystream.cpp
     path.cpp
     urlpars.cpp
+    unicode.cpp
     variant.cpp
 )
 
diff --git a/src/palrt/unicode.cpp b/src/palrt/unicode.cpp
new file mode 100644
index 0000000000..2ea581586c
--- /dev/null
+++ b/src/palrt/unicode.cpp
@@ -0,0 +1,28 @@
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+//
+
+#include "common.h" 
+
+// This is a simplified implementation of IsTextUnicode.
+// https://github.com/dotnet/coreclr/issues/2307
+BOOL IsTextUnicode(CONST VOID* lpv, int iSize, LPINT lpiResult)
+{
+    *lpiResult = 0;
+
+    if (iSize < 2) return FALSE;
+
+    BYTE * p = (BYTE *)lpv;
+
+    // Check for Unicode BOM
+    if ((*p == 0xFF) && (*(p+1) == 0xFE))
+    {
+        *lpiResult |= IS_TEXT_UNICODE_SIGNATURE;
+        return TRUE;
+    }
+
+    return FALSE;
+}
+