[wasm] Compile .bc->.o in parallel, before passing to the linker

eng/Versions.props

@@ -140,7 +140,7 @@
       These are used as reference assemblies only, so they must not take a ProdCon/source-build
       version. Insert "RefOnly" to avoid assignment via PVP.
     -->
-    <RefOnlyMicrosoftBuildVersion>16.8.0</RefOnlyMicrosoftBuildVersion>
+    <RefOnlyMicrosoftBuildVersion>16.9.0</RefOnlyMicrosoftBuildVersion>
     <RefOnlyMicrosoftBuildFrameworkVersion>$(RefOnlyMicrosoftBuildVersion)</RefOnlyMicrosoftBuildFrameworkVersion>
     <RefOnlyMicrosoftBuildTasksCoreVersion>$(RefOnlyMicrosoftBuildVersion)</RefOnlyMicrosoftBuildTasksCoreVersion>
     <RefOnlyMicrosoftBuildUtilitiesCoreVersion>$(RefOnlyMicrosoftBuildVersion)</RefOnlyMicrosoftBuildUtilitiesCoreVersion>

src/libraries/tests.proj

@@ -255,6 +255,8 @@
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetOS)' == 'Browser' and '$(RunDisabledWasmTests)' != 'true'">
+    <ProjectExclusions Include="$(MSBuildThisFileDirectory)Microsoft.NETCore.Platforms\tests\Microsoft.NETCore.Platforms.Tests.csproj" />
+
     <!-- Mono-Browser ignores runtimeconfig.template.json (e.g. for this it has "System.Globalization.EnforceJapaneseEraYearRanges": true) -->
     <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.Globalization.Calendars\tests\CalendarTestWithConfigSwitch\System.Globalization.CalendarsWithConfigSwitch.Tests.csproj" />
 
@@ -276,6 +278,9 @@
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetOS)' == 'Browser' and '$(BuildAOTTestsOnHelix)' == 'true' and '$(RunDisabledWasmTests)' != 'true' and '$(RunAOTCompilation)' == 'true'">
+    <!-- Issue: https://github.com/dotnet/runtime/issues/54194 -->
+    <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.IO.MemoryMappedFiles/tests/System.IO.MemoryMappedFiles.Tests.csproj" />
+
     <!-- Issue: https://github.com/dotnet/runtime/issues/52393 -->
     <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.Runtime/tests/System.Runtime.Tests.csproj" />
 

src/mono/wasm/build/WasmApp.Native.targets

@@ -3,6 +3,7 @@
 
   <UsingTask TaskName="PInvokeTableGenerator" AssemblyFile="$(WasmAppBuilderTasksAssemblyPath)" />
   <UsingTask TaskName="IcallTableGenerator" AssemblyFile="$(WasmAppBuilderTasksAssemblyPath)" />
+  <UsingTask TaskName="Microsoft.WebAssembly.Build.Tasks.EmccCompile" AssemblyFile="$(WasmAppBuilderTasksAssemblyPath)" />
 
   <PropertyGroup>
     <_WasmBuildNativeCoreDependsOn>
@@ -165,18 +166,14 @@
       <_EmccOptimizationFlagDefault Condition="'$(_EmccOptimizationFlagDefault)' == ''">-Oz</_EmccOptimizationFlagDefault>
 
       <EmccCompileOptimizationFlag Condition="'$(EmccCompileOptimizationFlag)' == ''">$(_EmccOptimizationFlagDefault)</EmccCompileOptimizationFlag>
-      <EmccLinkOptimizationFlag    Condition="'$(EmccLinkOptimizationFlag)' == ''"   >$(_EmccOptimizationFlagDefault)</EmccLinkOptimizationFlag>
+      <EmccLinkOptimizationFlag    Condition="'$(EmccLinkOptimizationFlag)' == ''"   >-O0</EmccLinkOptimizationFlag>
     </PropertyGroup>
 
     <ItemGroup>
       <_EmccCommonFlags Include="$(_DefaultEmccFlags)" />
       <_EmccCommonFlags Include="$(EmccFlags)" />
       <_EmccCommonFlags Include="-s DISABLE_EXCEPTION_CATCHING=0" />
       <_EmccCommonFlags Include="-g"                                Condition="'$(WasmNativeStrip)' == 'false'" />
-      <_EmccCommonFlags Include="-DENABLE_AOT=1"                    Condition="'$(RunAOTCompilation)' == 'true'" />
-      <_EmccCommonFlags Include="-DDRIVER_GEN=1"                    Condition="'$(RunAOTCompilation)' == 'true'" />
-      <_EmccCommonFlags Include="-DINVARIANT_GLOBALIZATION=1"       Condition="'$(InvariantGlobalization)' == 'true'" />
-      <_EmccCommonFlags Include="-DLINK_ICALLS=1"                   Condition="'$(WasmLinkIcalls)' == 'true'" />
       <_EmccCommonFlags Include="-v"                                Condition="'$(EmccVerbose)' != 'false'" />
     </ItemGroup>
 
@@ -186,11 +183,7 @@
    </PropertyGroup>
 
    <ItemGroup>
-     <_WasmObjectsToBuild Include="$(_WasmRuntimePackSrcDir)\*.c" />
-     <_WasmObjectsToBuild OutputPath="$(_WasmIntermediateOutputPath)%(FileName).o" />
-
      <_DotnetJSSrcFile Include="$(_WasmRuntimePackSrcDir)\*.js" />
-     <_WasmPInvokeModules Include="%(_WasmNativeFileForLinking.FileName)" />
    </ItemGroup>
   </Target>
 
@@ -227,54 +220,84 @@
       <!-- Adding optimization flag at the top, so it gets precedence -->
       <_EmccCFlags Include="$(EmccCompileOptimizationFlag)" />
       <_EmccCFlags Include="@(_EmccCommonFlags)" />
+
+      <_EmccCFlags Include="-DENABLE_AOT=1"                    Condition="'$(RunAOTCompilation)' == 'true'" />
+      <_EmccCFlags Include="-DDRIVER_GEN=1"                    Condition="'$(RunAOTCompilation)' == 'true'" />
+      <_EmccCFlags Include="-DINVARIANT_GLOBALIZATION=1"       Condition="'$(InvariantGlobalization)' == 'true'" />
+      <_EmccCFlags Include="-DLINK_ICALLS=1"                   Condition="'$(WasmLinkIcalls)' == 'true'" />
       <_EmccCFlags Include="-DCORE_BINDINGS" />
       <_EmccCFlags Include="-DGEN_PINVOKE=1" />
+
       <_EmccCFlags Include="&quot;-I%(_EmccIncludePaths.Identity)&quot;" />
       <_EmccCFlags Include="-g" Condition="'$(WasmNativeDebugSymbols)' == 'true'" />
       <_EmccCFlags Include="-s EXPORTED_FUNCTIONS='[@(_ExportedFunctions->'&quot;%(Identity)&quot;', ',')]'" Condition="@(_ExportedFunctions->Count()) > 0" />
 
       <_EmccCFlags Include="$(EmccExtraCFlags)" />
+
+      <_WasmRuntimePackSrcFile Remove="@(_WasmRuntimePackSrcFile)" />
+      <_WasmRuntimePackSrcFile Include="$(_WasmRuntimePackSrcDir)\*.c" />
+      <_WasmRuntimePackSrcFile ObjectFile="$(_WasmIntermediateOutputPath)%(FileName).o" />
+      <_WasmSourceFileToCompile Include="@(_WasmRuntimePackSrcFile)" />
     </ItemGroup>
 
     <PropertyGroup>
+      <_EmBuilder Condition="$([MSBuild]::IsOSPlatform('WINDOWS'))">embuilder.bat</_EmBuilder>
+      <_EmBuilder Condition="!$([MSBuild]::IsOSPlatform('WINDOWS'))">embuilder.py</_EmBuilder>
       <_EmccCompileRsp>$(_WasmIntermediateOutputPath)emcc-compile.rsp</_EmccCompileRsp>
     </PropertyGroup>
 
     <WriteLinesToFile Lines="@(_EmccCFlags)" File="$(_EmccCompileRsp)" Overwrite="true" WriteOnlyWhenDifferent="true" />
 
+    <!-- warm up the cache -->
+    <Exec Command="$(_EmBuilder) build MINIMAL" EnvironmentVariables="@(EmscriptenEnvVars)" StandardOutputImportance="Low" StandardErrorImportance="Low" />
+
     <Message Text="Compiling native assets with emcc. This may take a while ..." Importance="High" />
-    <Exec Command='emcc "@$(_EmccDefaultFlagsRsp)" "@$(_EmccCompileRsp)" "%(_WasmObjectsToBuild.Identity)" -c -o "%(_WasmObjectsToBuild.OutputPath)"' EnvironmentVariables="@(EmscriptenEnvVars)" />
+    <EmccCompile SourceFiles="@(_WasmSourceFileToCompile)" Arguments='"@$(_EmccDefaultFlagsRsp)" "@$(_EmccCompileRsp)"' EnvironmentVariables="@(EmscriptenEnvVars)" />
   </Target>
 
   <Target Name="_WasmLinkDotNet">
     <ItemGroup>
-      <_WasmRuntimePackNativeLibs Include="$(MicrosoftNetCoreAppRuntimePackRidNativeDir)\*.a" />
-      <_WasmObjects Include="@(_WasmRuntimePackNativeLibs)" />
-      <_WasmObjects Include="@(_WasmObjectsToBuild->'%(OutputPath)')" />
-
       <!-- Adding optimization flag at the top, so it gets precedence -->
       <_EmccLDFlags Include="$(EmccLinkOptimizationFlag)" />
       <_EmccLDFlags Include="@(_EmccCommonFlags)" />
+
       <_EmccLDFlags Include="-s TOTAL_MEMORY=536870912" />
       <_EmccLDFlags Include="$(EmccExtraLDFlags)" />
+    </ItemGroup>
+
+    <EmccCompile
+          Condition="@(_BitCodeFile->Count()) > 0"
+          SourceFiles="@(_BitCodeFile)"
+          Arguments="&quot;@$(_EmccDefaultFlagsRsp)&quot; @(_EmccLDFlags->'%(Identity)', ' ')"
+          EnvironmentVariables="@(EmscriptenEnvVars)" />
+
+    <ItemGroup>
+      <!-- order seems to matter -->
+      <_WasmNativeFileForLinking Include="%(_BitcodeFile.ObjectFile)" />
+      <_WasmNativeFileForLinking Include="%(_WasmSourceFileToCompile.ObjectFile)" />
 
-      <_EmccLDFlags Include="--js-library &quot;%(_DotnetJSSrcFile.Identity)&quot;" />
-      <_EmccLDFlags Include="--js-library &quot;%(_WasmExtraJSFile.Identity)&quot;" Condition="'%(_WasmExtraJSFile.Kind)' == 'js-library'" />
+      <!-- libmono* needs to be at the end, since it is used to resolve references the previous .o files -->
+      <_WasmNativeFileForLinking Include="$(MicrosoftNetCoreAppRuntimePackRidNativeDir)\*.a" />
 
-      <_EmccLDFlags Include="--pre-js &quot;%(_WasmExtraJSFile.Identity)&quot;"     Condition="'%(_WasmExtraJSFile.Kind)' == 'pre-js'" />
-      <_EmccLDFlags Include="--post-js &quot;%(_WasmExtraJSFile.Identity)&quot;"    Condition="'%(_WasmExtraJSFile.Kind)' == 'post-js'" />
+      <_EmccLinkStepArgs Include="@(_EmccLDFlags)" />
+      <_EmccLinkStepArgs Include="--js-library &quot;%(_DotnetJSSrcFile.Identity)&quot;" />
+      <_EmccLinkStepArgs Include="--js-library &quot;%(_WasmExtraJSFile.Identity)&quot;" Condition="'%(_WasmExtraJSFile.Kind)' == 'js-library'" />
 
-      <_EmccLDFlags Include="&quot;%(_WasmNativeFileForLinking.Identity)&quot;" />
-      <_EmccLDFlags Include="&quot;%(_WasmObjects.Identity)&quot;" />
-      <_EmccLDFlags Include="-o &quot;$(_WasmIntermediateOutputPath)dotnet.js&quot;" />
+      <_EmccLinkStepArgs Include="--pre-js &quot;%(_WasmExtraJSFile.Identity)&quot;"     Condition="'%(_WasmExtraJSFile.Kind)' == 'pre-js'" />
+      <_EmccLinkStepArgs Include="--post-js &quot;%(_WasmExtraJSFile.Identity)&quot;"    Condition="'%(_WasmExtraJSFile.Kind)' == 'post-js'" />
+
+      <_EmccLinkStepArgs Include="&quot;%(_WasmNativeFileForLinking.Identity)&quot;" />
+      <_EmccLinkStepArgs Include="-o &quot;$(_WasmIntermediateOutputPath)dotnet.js&quot;" />
     </ItemGroup>
 
     <PropertyGroup>
       <_EmccLinkRsp>$(_WasmIntermediateOutputPath)emcc-link.rsp</_EmccLinkRsp>
     </PropertyGroup>
 
-    <WriteLinesToFile Lines="@(_EmccLDFlags)" File="$(_EmccLinkRsp)" Overwrite="true" WriteOnlyWhenDifferent="true" />
-    <Message Text="Running emcc with @(_EmccLDFlags->'%(Identity)', ' ')" Importance="Low" />
+    <WriteLinesToFile Lines="@(_EmccLinkStepArgs)" File="$(_EmccLinkRsp)" Overwrite="true" WriteOnlyWhenDifferent="true" />
+
+    <Message Text="Linking with emcc. This may take a while ..." Importance="High" />
+    <Message Text="Running emcc with @(_EmccLinkStepArgs->'%(Identity)', ' ')" Importance="Low" />
     <Exec Command='emcc "@$(_EmccDefaultFlagsRsp)" "@$(_EmccLinkRsp)"' EnvironmentVariables="@(EmscriptenEnvVars)" />
 
     <Exec Command='wasm-opt$(_ExeExt) --strip-dwarf "$(_WasmIntermediateOutputPath)dotnet.wasm" -o "$(_WasmIntermediateOutputPath)dotnet.wasm"' Condition="'$(WasmNativeStrip)' == 'true'" IgnoreStandardErrorWarningFormat="true" EnvironmentVariables="@(EmscriptenEnvVars)" />
@@ -289,7 +312,7 @@
 
   <Target Name="_GenerateDriverGenC" Condition="'$(RunAOTCompilation)' != 'true' and '$(WasmProfilers)' != ''">
     <PropertyGroup>
-      <EmccFlags>$(EmccFlags) -DDRIVER_GEN=1</EmccFlags>
+      <EmccExtraCFlags>$(EmccExtraCFlags) -DDRIVER_GEN=1</EmccExtraCFlags>
       <InitAotProfilerCmd>
 void mono_profiler_init_aot (const char *desc)%3B
 EMSCRIPTEN_KEEPALIVE void mono_wasm_load_profiler_aot (const char *desc) { mono_profiler_init_aot (desc)%3B }
@@ -405,7 +428,7 @@ EMSCRIPTEN_KEEPALIVE void mono_wasm_load_profiler_aot (const char *desc) { mono_
       Profilers="$(WasmProfilers)"
       AotModulesTablePath="$(_WasmIntermediateOutputPath)driver-gen.c"
       UseLLVM="true"
-      DisableParallelAot="true"
+      DisableParallelAot="$(DisableParallelAot)"
       DedupAssembly="$(_WasmDedupAssembly)"
       LLVMDebug="dwarfdebug"
       LLVMPath="$(EmscriptenUpstreamBinPath)" >
@@ -420,8 +443,7 @@ EMSCRIPTEN_KEEPALIVE void mono_wasm_load_profiler_aot (const char *desc) { mono_
 
       <_AOTAssemblies Include="@(_WasmAssembliesInternal)" Condition="'%(_WasmAssembliesInternal._InternalForceInterpret)' != 'true'" />
       <_BitcodeFile Include="%(_WasmAssembliesInternal.LlvmBitcodeFile)" />
-
-      <_WasmNativeFileForLinking Include="@(_BitcodeFile)" />
+      <_BitcodeFile ObjectFile="$(_WasmIntermediateOutputPath)%(FileName).o" />
     </ItemGroup>
   </Target>
 

src/tasks/AotCompilerTask/MonoAOTCompiler.cs

@@ -417,8 +417,17 @@ private bool PrecompileLibrary(ITaskItem assemblyItem, string? monoPaths)
         try
         {
             // run the AOT compiler
-            Utils.RunProcess(CompilerBinaryPath, string.Join(" ", processArgs), envVariables, assemblyDir, silent: false,
-                    outputMessageImportance: MessageImportance.Low, debugMessageImportance: MessageImportance.Low);
+            (int exitCode, string output) = Utils.TryRunProcess(CompilerBinaryPath,
+                                                                string.Join(" ", processArgs),
+                                                                envVariables,
+                                                                assemblyDir,
+                                                                silent: false,
+                                                                debugMessageImportance: MessageImportance.Low);
+            if (exitCode != 0)
+            {
+                Log.LogError($"Precompiling failed for {assembly}: {output}");
+                return false;
+            }
         }
         catch (Exception ex)
         {

src/tasks/Common/Utils.cs

@@ -5,6 +5,7 @@
 using System.Collections.Generic;
 using System.Diagnostics;
 using System.IO;
+using System.Runtime.InteropServices;
 using System.Text;
 using Microsoft.Build.Framework;
 using Microsoft.Build.Utilities;
@@ -21,17 +22,81 @@ public static string GetEmbeddedResource(string file)
         return reader.ReadToEnd();
     }
 
+    public static (int exitCode, string output) RunShellCommand(string command,
+                                        IDictionary<string, string> envVars,
+                                        string workingDir,
+                                        MessageImportance debugMessageImportance=MessageImportance.Low)
+    {
+        string scriptFileName = CreateTemporaryBatchFile(command);
+        (string shell, string args) = RuntimeInformation.IsOSPlatform(OSPlatform.Windows)
+                                                    ? ("cmd", $"/c \"{scriptFileName}\"")
+                                                    : ("/bin/sh", $"\"{scriptFileName}\"");
+
+        Logger?.LogMessage(debugMessageImportance, $"Running {command} via script {scriptFileName}:");
+        Logger?.LogMessage(debugMessageImportance, File.ReadAllText(scriptFileName));
+
+        return TryRunProcess(shell,
+                             args,
+                             envVars,
+                             workingDir,
+                             silent: false,
+                             debugMessageImportance);
+
+        static string CreateTemporaryBatchFile(string command)
+        {
+            string extn = RuntimeInformation.IsOSPlatform(OSPlatform.Windows) ? ".cmd" : ".sh";
+            string file = Path.Combine(Path.GetTempPath(), $"tmp{Guid.NewGuid():N}{extn}");
+
+            using StreamWriter sw = new(file);
+            if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+            {
+                sw.WriteLine("setlocal");
+                sw.WriteLine("set errorlevel=dummy");
+                sw.WriteLine("set errorlevel=");
+            }
+            else
+            {
+                // Use sh rather than bash, as not all 'nix systems necessarily have Bash installed
+                sw.WriteLine("#!/bin/sh");
+            }
+
+            sw.WriteLine(command);
+            return file;
+        }
+    }
+
     public static string RunProcess(
         string path,
         string args = "",
         IDictionary<string, string>? envVars = null,
         string? workingDir = null,
         bool ignoreErrors = false,
         bool silent = true,
-        MessageImportance outputMessageImportance=MessageImportance.High,
         MessageImportance debugMessageImportance=MessageImportance.High)
     {
-        LogInfo($"Running: {path} {args}", debugMessageImportance);
+        (int exitCode, string output) = TryRunProcess(
+                                            path,
+                                            args,
+                                            envVars,
+                                            workingDir,
+                                            silent,
+                                            debugMessageImportance);
+
+        if (exitCode != 0 && !ignoreErrors)
+            throw new Exception("Error: Process returned non-zero exit code: " + output);
+
+        return output;
+    }
+
+    public static (int, string) TryRunProcess(
+        string path,
+        string args = "",
+        IDictionary<string, string>? envVars = null,
+        string? workingDir = null,
+        bool silent = true,
+        MessageImportance debugMessageImportance=MessageImportance.High)
+    {
+        Logger?.LogMessage(debugMessageImportance, $"Running: {path} {args}");
         var outputBuilder = new StringBuilder();
         var processStartInfo = new ProcessStartInfo
         {
@@ -46,7 +111,7 @@ public static string RunProcess(
         if (workingDir != null)
             processStartInfo.WorkingDirectory = workingDir;
 
-        LogInfo($"Using working directory: {workingDir ?? Environment.CurrentDirectory}", debugMessageImportance);
+        Logger?.LogMessage(debugMessageImportance, $"Using working directory: {workingDir ?? Environment.CurrentDirectory}");
 
         if (envVars != null)
         {
@@ -68,36 +133,55 @@ public static string RunProcess(
         {
             lock (s_SyncObj)
             {
+                if (string.IsNullOrEmpty(e.Data))
+                    return;
+
                 if (!silent)
-                {
                     LogWarning(e.Data);
-                }
                 outputBuilder.AppendLine(e.Data);
             }
         };
         process.OutputDataReceived += (sender, e) =>
         {
             lock (s_SyncObj)
             {
+                if (string.IsNullOrEmpty(e.Data))
+                    return;
+
                 if (!silent)
-                {
-                    LogInfo(e.Data, outputMessageImportance);
-                }
+                    Logger?.LogMessage(debugMessageImportance, e.Data);
                 outputBuilder.AppendLine(e.Data);
             }
         };
         process.BeginOutputReadLine();
         process.BeginErrorReadLine();
         process.WaitForExit();
 
-        if (process.ExitCode != 0)
+        Logger?.LogMessage(debugMessageImportance, $"Exit code: {process.ExitCode}");
+        return (process.ExitCode, outputBuilder.ToString().Trim('\r', '\n'));
+    }
+
+    internal static string CreateTemporaryBatchFile(string command)
+    {
+        string extn = RuntimeInformation.IsOSPlatform(OSPlatform.Windows) ? ".cmd" : ".sh";
+        string file = Path.Combine(Path.GetTempPath(), $"tmp{Guid.NewGuid():N}{extn}");
+
+        using StreamWriter sw = new(file);
+        if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
         {
-            Logger?.LogMessage(MessageImportance.High, $"Exit code: {process.ExitCode}");
-            if (!ignoreErrors)
-                throw new Exception("Error: Process returned non-zero exit code: " + outputBuilder);
+                sw.WriteLine("setlocal");
+                sw.WriteLine("set errorlevel=dummy");
+                sw.WriteLine("set errorlevel=");
         }
+        else
+        {
+            // Use sh rather than bash, as not all 'nix systems necessarily have Bash installed
+            sw.WriteLine("#!/bin/sh");
+        }
+
+        sw.WriteLine(command);
 
-        return silent ? string.Empty : outputBuilder.ToString().Trim('\r', '\n');
+        return file;
     }
 
 #if NETCOREAPP