Debugger: do not reject data parsed in the background when debugging.

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-numbering.h"
 #include "src/bootstrapper.h"
@@ skipping 1309 matching lines @@
   isolate->counters()->total_load_size()->Increment(source_length);
   isolate->counters()->total_compile_size()->Increment(source_length);
 
   LanguageMode language_mode =
       construct_language_mode(FLAG_use_strict, FLAG_use_strong);
   parse_info->set_language_mode(
       static_cast<LanguageMode>(parse_info->language_mode() | language_mode));
 
   CompilationInfo compile_info(parse_info);
 
-  // If compiling for debugging, parse eagerly from scratch.
-  if (compile_info.is_debug()) parse_info->set_literal(NULL);
+  // The source was parsed lazily, so compiling for debugging is not possible.
+  DCHECK(!compile_info.is_debug());
 
   return CompileToplevel(&compile_info);
 }
 
 
 Handle<SharedFunctionInfo> Compiler::GetSharedFunctionInfo(
     FunctionLiteral* literal, Handle<Script> script,
     CompilationInfo* outer_info) {
   // Precondition: code has been parsed and scopes have been analyzed.
   Isolate* isolate = outer_info->isolate();
@@ skipping 274 matching lines @@
 
 
 #if DEBUG
 void CompilationInfo::PrintAstForTesting() {
   PrintF("--- Source from AST ---\n%s\n",
          PrettyPrinter(isolate(), zone()).PrintProgram(function()));
 }
 #endif
 }  // namespace internal
 }  // namespace v8