Merge pull request #28284 from tapthaker/SR-11765-pretty-stack-trace

[FrontEnd] Pretty stack trace indicating running user code

Author: Harlan Haskins

lib/FrontendTool/FrontendTool.cpp

@@ -1337,6 +1337,12 @@ static bool processCommandLineAndRunImmediately(CompilerInvocation &Invocation,
       ProcessCmdLine(opts.ImmediateArgv.begin(), opts.ImmediateArgv.end());
   Instance.setSILModule(std::move(SM));
 
+
+  PrettyStackTraceStringAction trace(
+      "running user code",
+      MSF.is<SourceFile *>() ? MSF.get<SourceFile *>()->getFilename()
+                     : MSF.get<ModuleDecl *>()->getModuleFilename());
+
   ReturnValue =
       RunImmediately(Instance, CmdLine, IRGenOpts, Invocation.getSILOptions());
   return Instance.getASTContext().hadError();

test/Frontend/crash-in-user-code.swift

@@ -0,0 +1,15 @@
+
+// RUN: echo %s > %t.filelist.txt
+// RUN: not --crash %target-swift-frontend -interpret -filelist %t.filelist.txt 2>&1 | %FileCheck %s
+
+// CHECK: Stack dump:
+// CHECK-NEXT: Program arguments:
+// CHECK-NEXT: Swift version
+// CHECK-NEXT: Contents of {{.*}}.filelist.txt:
+// CHECK-NEXT: ---
+// CHECK-NEXT: crash-in-user-code.swift
+// CHECK-NEXT: ---
+// CHECK-NEXT: While running user code "{{.*}}crash-in-user-code.swift"
+
+let x: Int? = nil
+x!