C#: Extract source files generated by source generators

Author: tamasvajk

csharp/extractor/Semmle.Extraction.CSharp/Extractor/Extractor.cs

@@ -381,8 +381,17 @@ private static ExitCode AnalyseTracing(
                 references => ResolveReferences(compilerArguments, analyser, canonicalPathCache, references),
                 (analyser, syntaxTrees) =>
                 {
+                    var paths = compilerArguments.SourceFiles
+                        .Select(src => src.Path)
+                        .ToList();
+
+                    if (compilerArguments.GeneratedFilesOutputDirectory is not null)
+                    {
+                        paths.AddRange(Directory.GetFiles(compilerArguments.GeneratedFilesOutputDirectory, "*.cs", SearchOption.AllDirectories));
+                    }
+
                     return ReadSyntaxTrees(
-                        compilerArguments.SourceFiles.Select(src => canonicalPathCache.GetCanonicalPath(src.Path)),
+                        paths.Select(canonicalPathCache.GetCanonicalPath),
                         analyser,
                         compilerArguments.ParseOptions,
                         compilerArguments.Encoding,

csharp/tools/tracing-config.lua

@@ -63,7 +63,7 @@ function RegisterExtractorPack(id)
             end
         end
         if match then
-            local injections = { '-p:UseSharedCompilation=false' }
+            local injections = { '-p:UseSharedCompilation=false', '-p:EmitCompilerGeneratedFiles=true' }
             if dotnetRunNeedsSeparator then
                 table.insert(injections, '--')
             end
@@ -118,7 +118,8 @@ function RegisterExtractorPack(id)
                     compilerArguments,
                     nil, {
                     '/p:UseSharedCompilation=false',
-                    '/p:MvcBuildViews=true'
+                    '/p:MvcBuildViews=true',
+                    '/p:EmitCompilerGeneratedFiles=true',
                 })
 
             }
@@ -154,7 +155,7 @@ function RegisterExtractorPack(id)
 
             if seenCompilerCall then
                 return {
-                    order = ORDER_BEFORE,
+                    order = ORDER_AFTER,
                     invocation = {
                         path = AbsolutifyExtractorPath(id, extractor),
                         arguments = {
@@ -194,7 +195,7 @@ function RegisterExtractorPack(id)
 
             if seenCompilerCall then
                 return {
-                    order = ORDER_BEFORE,
+                    order = ORDER_AFTER,
                     invocation = {
                         path = AbsolutifyExtractorPath(id, extractor),
                         arguments = {