Add support for building wasm on OSX and Ubuntu 16 (#5297)

* Enable wasm building on OSX.

Upgrade libLLVM to 4.0.0 and LLVMSharp to 5.0.0

LLVM upgrade: Fix 'Use still stuck around after Def is destroyed' of the deleted basic blocks

Add wasm support in runtest.sh

Remove HelloWasm.csproj reference to .ilproj on non-windows OS because of dependency on ilasm

Fix LinkNative target to execute correct commands for Unix wasm builds.

Added support for building on Ubuntu 16.04.3

Update documentation on how to build WebAssembly.

5 files changed, 75 insertions, 32 deletions

diff --git a/tests/runtest.sh b/tests/runtest.sh
index 15bff4f2e..36d087023 100755
--- a/tests/runtest.sh
+++ b/tests/runtest.sh
@@ -41,6 +41,9 @@ run_test_dir()
     if [ "${__mode}" = "Cpp" ]; then
         __extra_args="${__extra_args} /p:NativeCodeGen=cpp"
     fi
+    if [ "${__mode}" = "Wasm" ]; then
+        __extra_args="${__extra_args} /p:NativeCodeGen=wasm"
+    fi
     if [ -n "${__extra_cxxflags}" ]; then
         __extra_cxxflags="/p:AdditionalCppCompilerFlags=\"${__extra_cxxflags}\""
     fi
@@ -176,6 +179,12 @@ while [ "$1" != "" ]; do
             usage
             exit 1
             ;;
+        wasm)
+            CoreRT_BuildArch=wasm
+            CoreRT_BuildOS=WebAssembly
+            CoreRT_TestCompileMode=wasm
+            CoreRT_TestRun=false
+            ;;
         x86)
             CoreRT_BuildArch=x86
             ;;
@@ -319,7 +328,8 @@ __CppTotalTests=0
 __CppPassedTests=0
 __JitTotalTests=0
 __JitPassedTests=0
-
+__WasmTotalTests=0
+__WasmPassedTests=0
 
 if [ ! -d ${__CoreRTTestBinDir} ]; then
     mkdir -p ${__CoreRTTestBinDir}
@@ -330,20 +340,28 @@ __BuildOsLowcase=$(echo "${CoreRT_BuildOS}" | tr '[:upper:]' '[:lower:]')
 __TestSearchPath=${CoreRT_TestRoot}/src/Simple/${CoreRT_TestName}
 for csproj in $(find ${__TestSearchPath} -name "*.csproj")
 do
-    if [ ! -e `dirname ${csproj}`/no_unix ]; then
-        if [ "${CoreRT_TestCompileMode}" != "cpp" ]; then
+    if [ -e `dirname ${csproj}`/no_unix ]; then continue; fi
+    if [ -e `dirname ${csproj}`/no_linux ] && [ "${CoreRT_HostOS}" != "OSX" ]; then continue; fi
+
+    if [ "${CoreRT_TestCompileMode}" = "ryujit" ] || [ "${CoreRT_TestCompileMode}" = "" ]; then
+        if [ ! -e `dirname ${csproj}`/no_ryujit ]; then
             run_test_dir ${csproj} "Jit"
         fi
+    fi
+    if [ "${CoreRT_TestCompileMode}" = "cpp" ] || [ "${CoreRT_TestCompileMode}" = "" ]; then
         if [ ! -e `dirname ${csproj}`/no_cpp ]; then
-            if [ "${CoreRT_TestCompileMode}" != "ryujit" ]; then
-                run_test_dir ${csproj} "Cpp" "$CoreRT_ExtraCXXFlags" "$CoreRT_ExtraLinkFlags"
-            fi
+            run_test_dir ${csproj} "Cpp" "$CoreRT_ExtraCXXFlags" "$CoreRT_ExtraLinkFlags"
+        fi
+    fi
+    if [ "${CoreRT_TestCompileMode}" = "wasm" ]; then
+        if [ -e `dirname ${csproj}`/wasm ]; then
+            run_test_dir ${csproj} "Wasm"
         fi
     fi
 done
 
-__TotalTests=$((${__JitTotalTests} + ${__CppTotalTests}))
-__PassedTests=$((${__JitPassedTests} + ${__CppPassedTests}))
+__TotalTests=$((${__JitTotalTests} + ${__CppTotalTests} + ${__WasmTotalTests}))
+__PassedTests=$((${__JitPassedTests} + ${__CppPassedTests} + ${__WasmPassedTests}))
 __FailedTests=$((${__TotalTests} - ${__PassedTests}))
 
 if [ "$CoreRT_MultiFileConfiguration" = "MultiModule" ]; then
@@ -366,19 +384,26 @@ echo "</assemblies>"  >> ${__TestResultsLog}
 
 echo "JIT - TOTAL: ${__JitTotalTests} PASSED: ${__JitPassedTests}"
 echo "CPP - TOTAL: ${__CppTotalTests} PASSED: ${__CppPassedTests}"
+echo "WASM - TOTAL: ${__WasmTotalTests} PASSED: ${__WasmPassedTests}"
 
-if [ ${__JitTotalTests} == 0 ]; then
+if [ ${__JitTotalTests} == 0 ] && [ "${CoreRT_TestCompileMode}" != "wasm" ]; then
     exit 1
 fi
-
-if [ ${__CppTotalTests} == 0 ]; then
+if [ ${__CppTotalTests} == 0 ] && [ "${CoreRT_TestCompileMode}" != "wasm" ]; then
     exit 1
 fi
+if [ ${__WasmTotalTests} == 0 ] && [ "${CoreRT_TestCompileMode}" = "wasm" ]; then
+    exit 1
+fi 
+
 if [ ${__JitTotalTests} -gt ${__JitPassedTests} ]; then
     exit 1
 fi
 if [ ${__CppTotalTests} -gt ${__CppPassedTests} ]; then
     exit 1
 fi
+if [ ${__WasmTotalTests} -gt ${__WasmPassedTests} ]; then
+    exit 1
+fi
 
 exit 0
diff --git a/tests/src/Simple/HelloWasm/HelloWasm.csproj b/tests/src/Simple/HelloWasm/HelloWasm.csproj
index b767a5dbd..f070f287a 100644
--- a/tests/src/Simple/HelloWasm/HelloWasm.csproj
+++ b/tests/src/Simple/HelloWasm/HelloWasm.csproj
@@ -2,9 +2,13 @@
   <ItemGroup>
     <Compile Include="*.cs" />
 
-    <ProjectReference Include="CpObj.ilproj" />
-    <IlcArg Include="-r:$(IntermediateOutputPath)\CpObj.dll" />
+    <ProjectReference Include="CpObj.ilproj" Condition="'$(OS)' == 'Windows_NT'" />
+    <IlcArg Include="-r:$(IntermediateOutputPath)\CpObj.dll" Condition="'$(OS)' == 'Windows_NT'" />
   </ItemGroup>
 
+  <PropertyGroup Condition="'$(OS)' == 'Windows_NT'">
+    <DefineConstants>PLATFORM_WINDOWS;$(DefineConstants)</DefineConstants>
+  </PropertyGroup>
+
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), SimpleTest.targets))\SimpleTest.targets" />
 </Project>
diff --git a/tests/src/Simple/HelloWasm/Program.cs b/tests/src/Simple/HelloWasm/Program.cs
index 2800c7579..bb8962c12 100644
--- a/tests/src/Simple/HelloWasm/Program.cs
+++ b/tests/src/Simple/HelloWasm/Program.cs
@@ -4,7 +4,9 @@
 
 using System;
 using System.Runtime.InteropServices;
+#if PLATFORM_WINDOWS
 using CpObj;
+#endif
 
 internal static class Program
 {
@@ -122,6 +124,7 @@ internal static class Program
             PrintLine("SwitchOpDefault test: Ok.");
         }
 
+#if PLATFORM_WINDOWS
         var cpObjTestA = new TestValue { Field = 1234 };
         var cpObjTestB = new TestValue { Field = 5678 };
         CpObjTest.CpObj(ref cpObjTestB, ref cpObjTestA);
@@ -129,6 +132,7 @@ internal static class Program
         {
             PrintLine("CpObj test: Ok.");
         }
+#endif
 
         Func<int> staticDelegate = StaticDelegateTarget;
         if(staticDelegate() == 7)
diff --git a/tests/src/Simple/HelloWasm/no_unix b/tests/src/Simple/HelloWasm/no_unix
deleted file mode 100644
index e6c22996c..000000000
--- a/tests/src/Simple/HelloWasm/no_unix
+++ /dev/null
@@ -1 +0,0 @@
-Doesn't work on OSX.
\ No newline at end of file
diff --git a/tests/testenv.sh b/tests/testenv.sh
index 69a636bca..bdf8765ce 100755
--- a/tests/testenv.sh
+++ b/tests/testenv.sh
@@ -14,6 +14,9 @@ for i in "$@"
 			usage
 			exit 1
 			;;
+		wasm)
+			CoreRT_BuildArch=wasm
+			;;
 		x86)
 			CoreRT_BuildArch=x86
 			;;
@@ -47,7 +50,7 @@ for i in "$@"
 done
 
 if [ -z ${CoreRT_BuildArch} ]; then
-    echo "Set CoreRT_BuildArch to x86/x64/arm/arm64"
+    echo "Set CoreRT_BuildArch to x86/x64/arm/arm64/wasm"
     exit -1
 fi
 
@@ -56,31 +59,39 @@ if [ -z ${CoreRT_BuildType} ]; then
     exit -1
 fi
 
+
 # Use uname to determine what the OS is.
-OSName=$(uname -s)
+export OSName=$(uname -s)
 case $OSName in
-    Darwin)
-        CoreRT_BuildOS=OSX
-        ;;
+	Darwin)
+		export CoreRT_HostOS=OSX
+		;;
 
-    FreeBSD)
-        CoreRT_BuildOS=FreeBSD
-        ;;
+	FreeBSD)
+		export CoreRT_HostOS=FreeBSD
+		;;
 
-    Linux)
-        CoreRT_BuildOS=Linux
-        ;;
+	Linux)
+		export CoreRT_HostOS=Linux
+		;;
 
-    NetBSD)
-        CoreRT_BuildOS=NetBSD
-        ;;
+	NetBSD)
+		export CoreRT_HostOS=NetBSD
+		;;
 
-    *)
-        echo "Unsupported OS $OSName detected, configuring as if for Linux"
-        CoreRT_BuildOS=Linux
-        ;;
+	*)
+		echo "Unsupported OS $OSName detected, configuring as if for Linux"
+		export CoreRT_HostOS=Linux
+		;;
 esac
 
+export CoreRT_BuildOS=${CoreRT_HostOS}
+
+# Overwrite __BuildOS with WebAssembly if wasm is target build arch, but keep the CoreRT_HostOS to match the Host OS
+if [ $__BuildArch == "wasm" ]; then
+    export CoreRT_BuildOS=WebAssembly
+fi
+
 export CoreRT_BuildArch
 export CoreRT_BuildType
 export CoreRT_BuildOS