/*

 * Copyright 1997-2008 Sun Microsystems, Inc.  All Rights Reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 *

 */

// Parser for for .class files

//

// The bytes describing the class file structure is read from a Stream object

class ClassFileParser VALUE_OBJ_CLASS_SPEC {

 private:

  bool _need_verify;

  bool _relax_verify;

  u2   _major_version;

  u2   _minor_version;

  symbolHandle _class_name;

  GrowableArray<Handle>* _cp_patches; // overrides for CP entries

  bool _has_finalizer;

  bool _has_empty_finalizer;

  bool _has_vanilla_constructor;

  enum { fixed_buffer_size = 128 };

  u_char linenumbertable_buffer[fixed_buffer_size];

  ClassFileStream* _stream;              // Actual input stream

  enum { LegalClass, LegalField, LegalMethod }; // used to verify unqualified names

  // Accessors

  ClassFileStream* stream()                        { return _stream; }

  void set_stream(ClassFileStream* st)             { _stream = st; }

  // Constant pool parsing

  void parse_constant_pool_entries(constantPoolHandle cp, int length, TRAPS);

  constantPoolHandle parse_constant_pool(TRAPS);

  // Interface parsing

  objArrayHandle parse_interfaces(constantPoolHandle cp,

                                  int length,

                                  Handle class_loader,

                                  Handle protection_domain,

                                  PerfTraceTime* vmtimer,

                                  symbolHandle class_name,

                                  TRAPS);

  // Field parsing

  void parse_field_attributes(constantPoolHandle cp, u2 attributes_count,

                              bool is_static, u2 signature_index,

                              u2* constantvalue_index_addr,

                              bool* is_synthetic_addr,

                              u2* generic_signature_index_addr,

                              typeArrayHandle* field_annotations, TRAPS);

  typeArrayHandle parse_fields(constantPoolHandle cp, bool is_interface,

                               struct FieldAllocationCount *fac,

                               objArrayHandle* fields_annotations, TRAPS);

  // Method parsing

  methodHandle parse_method(constantPoolHandle cp, bool is_interface,

                            AccessFlags* promoted_flags,

                            typeArrayHandle* method_annotations,

                            typeArrayHandle* method_parameter_annotations,

                            typeArrayHandle* method_default_annotations,

                            TRAPS);

  objArrayHandle parse_methods (constantPoolHandle cp, bool is_interface,

                                AccessFlags* promoted_flags,

                                bool* has_final_method,

                                objArrayOop* methods_annotations_oop,

                                objArrayOop* methods_parameter_annotations_oop,

                                objArrayOop* methods_default_annotations_oop,

                                TRAPS);

  typeArrayHandle sort_methods (objArrayHandle methods,

                                objArrayHandle methods_annotations,

                                objArrayHandle methods_parameter_annotations,

                                objArrayHandle methods_default_annotations,

                                TRAPS);

  typeArrayHandle parse_exception_table(u4 code_length, u4 exception_table_length,

                                        constantPoolHandle cp, TRAPS);

  void parse_linenumber_table(

      u4 code_attribute_length, u4 code_length,

      CompressedLineNumberWriteStream** write_stream, TRAPS);

  u2* parse_localvariable_table(u4 code_length, u2 max_locals, u4 code_attribute_length,

                                constantPoolHandle cp, u2* localvariable_table_length,

                                bool isLVTT, TRAPS);

  u2* parse_checked_exceptions(u2* checked_exceptions_length, u4 method_attribute_length,

                               constantPoolHandle cp, TRAPS);

  void parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index,

                        u1* u1_array, u2* u2_array, constantPoolHandle cp, TRAPS);

  typeArrayOop parse_stackmap_table(u4 code_attribute_length, TRAPS);

  // Classfile attribute parsing

  void parse_classfile_sourcefile_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS);

  void parse_classfile_source_debug_extension_attribute(constantPoolHandle cp,

                                                instanceKlassHandle k, int length, TRAPS);

  u2   parse_classfile_inner_classes_attribute(constantPoolHandle cp,

                                               instanceKlassHandle k, TRAPS);

  void parse_classfile_attributes(constantPoolHandle cp, instanceKlassHandle k, TRAPS);

  void parse_classfile_synthetic_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS);

  void parse_classfile_signature_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS);

  // Annotations handling

  typeArrayHandle assemble_annotations(u1* runtime_visible_annotations,

                                       int runtime_visible_annotations_length,

                                       u1* runtime_invisible_annotations,

                                       int runtime_invisible_annotations_length, TRAPS);

  // Final setup

  int  compute_oop_map_size(instanceKlassHandle super, int nonstatic_oop_count,

                            int first_nonstatic_oop_offset);

  void fill_oop_maps(instanceKlassHandle k, int nonstatic_oop_map_count,

                     u2* nonstatic_oop_offsets, u2* nonstatic_oop_length);

  void set_precomputed_flags(instanceKlassHandle k);

  objArrayHandle compute_transitive_interfaces(instanceKlassHandle super,

                                               objArrayHandle local_ifs, TRAPS);

  // Special handling for certain classes.

  // Add the "discovered" field to java.lang.ref.Reference if

  // it does not exist.

  void java_lang_ref_Reference_fix_pre(typeArrayHandle* fields_ptr,

    constantPoolHandle cp, FieldAllocationCount *fac_ptr, TRAPS);

  // Adjust the field allocation counts for java.lang.Class to add

  // fake fields.

  void java_lang_Class_fix_pre(objArrayHandle* methods_ptr,

    FieldAllocationCount *fac_ptr, TRAPS);

  // Adjust the next_nonstatic_oop_offset to place the fake fields

  // before any Java fields.

  void java_lang_Class_fix_post(int* next_nonstatic_oop_offset);

  // Format checker methods

  void classfile_parse_error(const char* msg, TRAPS);

  void classfile_parse_error(const char* msg, int index, TRAPS);

  void classfile_parse_error(const char* msg, const char *name, TRAPS);

  void classfile_parse_error(const char* msg, int index, const char *name, TRAPS);

  inline void guarantee_property(bool b, const char* msg, TRAPS) {

    if (!b) { classfile_parse_error(msg, CHECK); }

  }

  inline void assert_property(bool b, const char* msg, TRAPS) {

#ifdef ASSERT

    if (!b) { fatal(msg); }

#endif

  }

  inline void check_property(bool property, const char* msg, int index, TRAPS) {

    if (_need_verify) {

      guarantee_property(property, msg, index, CHECK);

    } else {

      assert_property(property, msg, CHECK);

    }

  }

  inline void check_property(bool property, const char* msg, TRAPS) {

    if (_need_verify) {

      guarantee_property(property, msg, CHECK);

    } else {

      assert_property(property, msg, CHECK);

    }

  }

  inline void guarantee_property(bool b, const char* msg, int index, TRAPS) {

    if (!b) { classfile_parse_error(msg, index, CHECK); }

  }

  inline void guarantee_property(bool b, const char* msg, const char *name, TRAPS) {

    if (!b) { classfile_parse_error(msg, name, CHECK); }

  }

  inline void guarantee_property(bool b, const char* msg, int index, const char *name, TRAPS) {

    if (!b) { classfile_parse_error(msg, index, name, CHECK); }

  }

  bool is_supported_version(u2 major, u2 minor);

  bool has_illegal_visibility(jint flags);

  void verify_constantvalue(int constantvalue_index, int signature_index, constantPoolHandle cp, TRAPS);

  void verify_legal_utf8(const unsigned char* buffer, int length, TRAPS);

  void verify_legal_class_name(symbolHandle name, TRAPS);

  void verify_legal_field_name(symbolHandle name, TRAPS);

  void verify_legal_method_name(symbolHandle name, TRAPS);

  void verify_legal_field_signature(symbolHandle fieldname, symbolHandle signature, TRAPS);

  int  verify_legal_method_signature(symbolHandle methodname, symbolHandle signature, TRAPS);

  void verify_legal_class_modifiers(jint flags, TRAPS);

  void verify_legal_field_modifiers(jint flags, bool is_interface, TRAPS);

  void verify_legal_method_modifiers(jint flags, bool is_interface, symbolHandle name, TRAPS);

  bool verify_unqualified_name(char* name, unsigned int length, int type);

  char* skip_over_field_name(char* name, bool slash_ok, unsigned int length);

  char* skip_over_field_signature(char* signature, bool void_ok, unsigned int length, TRAPS);

  bool has_cp_patch_at(int index) {

    assert(AnonymousClasses, "");

    assert(index >= 0, "oob");

    return (_cp_patches != NULL

            && index < _cp_patches->length()

            && _cp_patches->adr_at(index)->not_null());

  }

  Handle cp_patch_at(int index) {

    assert(has_cp_patch_at(index), "oob");

    return _cp_patches->at(index);

  }

  Handle clear_cp_patch_at(int index) {

    Handle patch = cp_patch_at(index);

    _cp_patches->at_put(index, Handle());

    assert(!has_cp_patch_at(index), "");

    return patch;

  }

  void patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS);

  // Wrapper for constantTag.is_klass_[or_]reference.

  // In older versions of the VM, klassOops cannot sneak into early phases of

  // constant pool construction, but in later versions they can.

  // %%% Let's phase out the old is_klass_reference.

  bool is_klass_reference(constantPoolHandle cp, int index) {

    return ((LinkWellKnownClasses || AnonymousClasses)

            ? cp->tag_at(index).is_klass_or_reference()

            : cp->tag_at(index).is_klass_reference());

  }

 public:

  // Constructor

  ClassFileParser(ClassFileStream* st) { set_stream(st); }

  // Parse .class file and return new klassOop. The klassOop is not hooked up

  // to the system dictionary or any other structures, so a .class file can

  // be loaded several times if desired.

  // The system dictionary hookup is done by the caller.

  //

  // "parsed_name" is updated by this method, and is the name found

  // while parsing the stream.

  instanceKlassHandle parseClassFile(symbolHandle name,

                                     Handle class_loader,

                                     Handle protection_domain,

                                     symbolHandle& parsed_name,

                                     TRAPS) {

    return parseClassFile(name, class_loader, protection_domain, NULL, parsed_name, THREAD);

  }

  instanceKlassHandle parseClassFile(symbolHandle name,

                                     Handle class_loader,

                                     Handle protection_domain,

                                     GrowableArray<Handle>* cp_patches,

                                     symbolHandle& parsed_name,

                                     TRAPS);

  // Verifier checks

  static void check_super_class_access(instanceKlassHandle this_klass, TRAPS);

  static void check_super_interface_access(instanceKlassHandle this_klass, TRAPS);

  static void check_final_method_override(instanceKlassHandle this_klass, TRAPS);

  static void check_illegal_static_method(instanceKlassHandle this_klass, TRAPS);

};