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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.Text;
using Microsoft.Xunit.Performance;
using System;
using System.IO;
using System.Linq;
using System.Runtime.CompilerServices;
[assembly: OptimizeForBenchmarks]
[assembly: MeasureInstructionsRetired]
public static class CscBench
{
#if DEBUG
public const int CompileIterations = 1;
public const int DataflowIterations = 1;
#else
public const int CompileIterations = 1500;
public const int DataflowIterations = 10000;
#endif
public static string MscorlibPath;
static bool FindMscorlib()
{
string CoreRoot = System.Environment.GetEnvironmentVariable("CORE_ROOT");
if (CoreRoot == null) { return false; }
// Some CoreCLR packages have System.Private.CoreLib.ni.dll only
string nicorlib = Path.Combine(CoreRoot, "System.Private.CoreLib.ni.dll");
if(File.Exists(nicorlib))
{
MscorlibPath = nicorlib;
return true;
}
MscorlibPath = Path.Combine(CoreRoot, "System.Private.CoreLib.dll");
return File.Exists(MscorlibPath);
}
[MethodImpl(MethodImplOptions.NoInlining)]
public static bool CompileBench()
{
var expression = "6 * 7";
var text = @"public class Calculator { public static object Evaluate() { return $; } }".Replace("$", expression);
var tree = SyntaxFactory.ParseSyntaxTree(text);
var compilation = CSharpCompilation.Create(
"calc.dll",
options: new CSharpCompilationOptions(OutputKind.DynamicallyLinkedLibrary),
syntaxTrees: new[] { tree },
references: new[] { MetadataReference.CreateFromFile(MscorlibPath) });
bool result = true;
for (int i = 0; i < CompileIterations; i++)
{
using (var stream = new MemoryStream())
{
var emitResult = compilation.Emit(stream);
result &= emitResult.Success;
}
}
return result;
}
[Benchmark]
public static void CompileTest()
{
if (!FindMscorlib())
{
throw new Exception("This test requires CORE_ROOT to be set");
}
foreach (var iteration in Benchmark.Iterations)
{
using (iteration.StartMeasurement())
{
CompileBench();
}
}
}
public static TextSpan GetSpanBetweenMarkers(SyntaxTree tree)
{
SyntaxTrivia startComment = tree
.GetRoot()
.DescendantTrivia()
.First(syntaxTrivia => syntaxTrivia.ToString().Contains("start"));
SyntaxTrivia endComment = tree
.GetRoot()
.DescendantTrivia()
.First(syntaxTrivia => syntaxTrivia.ToString().Contains("end"));
TextSpan textSpan = TextSpan.FromBounds(
startComment.FullSpan.End,
endComment.FullSpan.Start);
return textSpan;
}
public static void GetStatementsBetweenMarkers(SyntaxTree tree, out StatementSyntax firstStatement, out StatementSyntax lastStatement)
{
TextSpan span = GetSpanBetweenMarkers(tree);
var statementsInside = tree
.GetRoot()
.DescendantNodes(span)
.OfType<StatementSyntax>()
.Where(s => span.Contains(s.Span));
firstStatement = statementsInside.First();
var first = firstStatement;
lastStatement = statementsInside
.Where(s => s.Parent == first.Parent)
.Last();
}
[MethodImpl(MethodImplOptions.NoInlining)]
public static bool DataflowBench()
{
var text = @"
class C {
public void F(int x)
{
int a;
/*start*/
int b;
int x, y = 1;
{ var z = ""a""; }
/*end*/
int c;
}
}";
var tree = SyntaxFactory.ParseSyntaxTree(text);
var compilation = CSharpCompilation.Create(
"calc.dll",
options: new CSharpCompilationOptions(OutputKind.DynamicallyLinkedLibrary),
syntaxTrees: new[] { tree },
references: new[] { MetadataReference.CreateFromFile(MscorlibPath) });
var semanticModel = compilation.GetSemanticModel(tree);
bool result = true;
for (int i = 0; i < DataflowIterations; i++)
{
StatementSyntax firstStatement, lastStatement;
GetStatementsBetweenMarkers(tree, out firstStatement, out lastStatement);
DataFlowAnalysis regionDataFlowAnalysis = semanticModel.AnalyzeDataFlow(firstStatement, lastStatement);
string declaredVars = string.Join(",", regionDataFlowAnalysis
.VariablesDeclared
.Select(symbol => symbol.Name));
result &= "b,x,y,z".Equals(declaredVars);
}
return result;
}
[Benchmark]
public static void DatflowTest()
{
if (!FindMscorlib())
{
throw new Exception("This test requires CORE_ROOT to be set");
}
foreach (var iteration in Benchmark.Iterations)
{
using (iteration.StartMeasurement())
{
DataflowBench();
}
}
}
static bool Bench()
{
bool result = true;
result &= CompileBench();
result &= DataflowBench();
return result;
}
public static int Main()
{
bool result = true;
if (!FindMscorlib())
{
Console.WriteLine("This test requires CORE_ROOT to be set");
result = false;
}
else {
result = Bench();
}
return result ? 100 : -1;
}
}
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