Allow Script::FindSharedFunctionInfo to return toplevel functions

src/compiler.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler.h"
 
 #include <algorithm>
 
 #include "src/ast/ast-numbering.h"
 #include "src/ast/prettyprinter.h"
@@ skipping 1552 matching lines @@
     maybe_existing = script->FindSharedFunctionInfo(literal);
   }
 
   // We found an existing shared function info. If it's already compiled,
   // don't worry about compiling it, and simply return it. If it's not yet
   // compiled, continue to decide whether to eagerly compile.
   // Carry on if we are compiling eager to obtain code for debugging,
   // unless we already have code with debut break slots.
   Handle<SharedFunctionInfo> existing;
   if (maybe_existing.ToHandle(&existing) && existing->is_compiled()) {
+    DCHECK(!existing->is_toplevel());
     if (!outer_info->is_debug() || existing->HasDebugCode()) {
       return existing;
     }
   }
 
   // Allocate a shared function info object.
   Handle<SharedFunctionInfo> result;
   if (!maybe_existing.ToHandle(&result)) {
     result = NewSharedFunctionInfoForLiteral(isolate, literal, script);
     result->set_is_toplevel(false);
@@ skipping 185 matching lines @@
     MaybeHandle<Code> code;
     if (cached.code != nullptr) code = handle(cached.code);
     Handle<Context> native_context(function->context()->native_context());
     SharedFunctionInfo::AddToOptimizedCodeMap(shared, native_context, code,
                                               literals, BailoutId::None());
   }
 }
 
 }  // namespace internal
 }  // namespace v8