[kernel] Delete most of the AST

runtime/vm/kernel_reader.h

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef RUNTIME_VM_KERNEL_READER_H_
 #define RUNTIME_VM_KERNEL_READER_H_
 
 #if !defined(DART_PRECOMPILED_RUNTIME)
 #include <map>
 
@@ skipping 48 matching lines @@
   // Returns the library containing the main procedure, null if there
   // was no main procedure, or a failure object if there was an error.
   dart::Object& ReadProgram();
 
   void ReadLibrary(intptr_t kernel_offset);
 
   const dart::String& DartSymbol(StringIndex index) {
     return translation_helper_.DartSymbol(index);
   }
 
+  const dart::String& DartSymbolForLib(intptr_t library_index) {
+    return translation_helper_.DartSymbol(
+        translation_helper_.CanonicalNameString(
+            library_canonical_name(library_index)));
+  }
+
+  intptr_t library_offset(intptr_t index) {
+    kernel::Reader reader(program_->kernel_data(),
+                          program_->kernel_data_size());
+    reader.set_offset(reader.size() - 4 -
+                      (program_->library_count() - index) * 4);
+    return reader.ReadUInt32();
+  }
+
+  NameIndex library_canonical_name(intptr_t index) {
+    kernel::Reader reader(program_->kernel_data(),
+                          program_->kernel_data_size());
+    reader.set_offset(reader.size() - 4 -
+                      (program_->library_count() - index) * 4);
+    reader.set_offset(reader.ReadUInt32());
+
+    // Start reading library.
+    reader.ReadFlags();  // read flags.
+    return reader.ReadCanonicalNameReference();
+  }
+
   uint8_t CharacterAt(StringIndex string_index, intptr_t index);
 
  private:
   friend class BuildingTranslationHelper;
 
   void ReadPreliminaryClass(dart::Class* klass,
                             ClassHelper* class_helper,
                             intptr_t type_parameter_count);
   dart::Class& ReadClass(const dart::Library& library,
                          const dart::Class& toplevel_class);
@@ skipping 40 matching lines @@
 
   GrowableArray<const dart::Function*> functions_;
   GrowableArray<const dart::Field*> fields_;
 };
 
 }  // namespace kernel
 }  // namespace dart
 
 #endif  // !defined(DART_PRECOMPILED_RUNTIME)
 #endif  // RUNTIME_VM_KERNEL_READER_H_