Get generated files binary log

closes #125

src/Basic.CompilerLog.UnitTests/BinaryLogReaderTests.cs

@@ -147,5 +147,18 @@ public void ReadDeletedPdb()
         var data = reader.ReadAllCompilationData().Single();
         var diagnostic = data.GetDiagnostics().Where(x => x.Severity == DiagnosticSeverity.Error).Single();
         Assert.Contains("Can't find portable pdb file for", diagnostic.GetMessage());
+
+        Assert.Throws<InvalidOperationException>(() => reader.ReadGeneratedFiles(data.CompilerCall));
+    }
+
+    [Fact]
+    public void ReadGeneratedFiles()
+    {
+        using var reader = BinaryLogReader.Create(Fixture.Console.Value.BinaryLogPath!, BasicAnalyzerKind.None);
+        var compilerCall = reader.ReadAllCompilerCalls().Single();
+        var generatedFiles = reader.ReadGeneratedFiles(compilerCall);
+        Assert.Single(generatedFiles);
+        var tuple = generatedFiles.Single();
+        Assert.True(tuple.Stream.TryGetBuffer(out var _));
     }
 }

src/Basic.CompilerLog.Util/BinaryLogReader.cs

@@ -305,6 +305,20 @@ public List<ReferenceData> ReadAllReferenceData(CompilerCall compilerCall)
         return ReadAllReferenceDataCore(args.MetadataReferences.Select(x => x.Reference), args.MetadataReferences.Length);
     }
 
+    /// <summary>
+    /// Attempt to add all the generated files from generators. When successful the generators
+    /// don't need to be run when re-hydrating the compilation.
+    /// </summary>
+    /// <remarks>
+    /// This method will throw if the compilation does not have a PDB compatible with generated files
+    /// available to read
+    /// </remarks>
+    public List<(string FilePath, MemoryStream Stream)> ReadGeneratedFiles(CompilerCall compilerCall)
+    {
+        var args = ReadCommandLineArguments(compilerCall);
+        return RoslynUtil.ReadGeneratedFiles(compilerCall, args);
+    }
+
     private List<ReferenceData> ReadAllReferenceDataCore(IEnumerable<string> filePaths, int count)
     {
         var list = new List<ReferenceData>(capacity: count);