JDK14/Java14源码在线阅读
/*
* Copyright (c) 1997, 2019, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#ifndef SHARE_CLASSFILE_CLASSFILEPARSER_HPP
#define SHARE_CLASSFILE_CLASSFILEPARSER_HPP
#include "memory/referenceType.hpp"
#include "oops/annotations.hpp"
#include "oops/constantPool.hpp"
#include "oops/typeArrayOop.hpp"
#include "utilities/accessFlags.hpp"
class Annotations;
template <typename T>
class Array;
class ClassFileStream;
class ClassLoaderData;
class CompressedLineNumberWriteStream;
class ConstMethod;
class FieldInfo;
template <typename T>
class GrowableArray;
class InstanceKlass;
class RecordComponent;
class Symbol;
class TempNewSymbol;
// Parser for for .class files
//
// The bytes describing the class file structure is read from a Stream object
class ClassFileParser {
class ClassAnnotationCollector;
class FieldAllocationCount;
class FieldAnnotationCollector;
class FieldLayoutInfo;
public:
// The ClassFileParser has an associated "publicity" level
// It is used to control which subsystems (if any)
// will observe the parsing (logging, events, tracing).
// Default level is "BROADCAST", which is equivalent to
// a "public" parsing attempt.
//
// "INTERNAL" level should be entirely private to the
// caller - this allows for internal reuse of ClassFileParser
//
enum Publicity {
INTERNAL,
BROADCAST
};
enum { LegalClass, LegalField, LegalMethod }; // used to verify unqualified names
private:
// Potentially unaligned pointer to various 16-bit entries in the class file
typedef void unsafe_u2;
const ClassFileStream* _stream; // Actual input stream
const Symbol* _requested_name;
Symbol* _class_name;
mutable ClassLoaderData* _loader_data;
const InstanceKlass* _unsafe_anonymous_host;
GrowableArray<Handle>* _cp_patches; // overrides for CP entries
int _num_patched_klasses;
int _max_num_patched_klasses;
int _orig_cp_size;
int _first_patched_klass_resolved_index;
// Metadata created before the instance klass is created. Must be deallocated
// if not transferred to the InstanceKlass upon successful class loading
// in which case these pointers have been set to NULL.
const InstanceKlass* _super_klass;
ConstantPool* _cp;
Array<u2>* _fields;
Array<Method*>* _methods;
Array<u2>* _inner_classes;
Array<u2>* _nest_members;
u2 _nest_host;
Array<RecordComponent*>* _record_components;
Array<InstanceKlass*>* _local_interfaces;
Array<InstanceKlass*>* _transitive_interfaces;
Annotations* _combined_annotations;
AnnotationArray* _class_annotations;
AnnotationArray* _class_type_annotations;
Array<AnnotationArray*>* _fields_annotations;
Array<AnnotationArray*>* _fields_type_annotations;
InstanceKlass* _klass; // InstanceKlass* once created.
InstanceKlass* _klass_to_deallocate; // an InstanceKlass* to be destroyed
ClassAnnotationCollector* _parsed_annotations;
FieldAllocationCount* _fac;
FieldLayoutInfo* _field_info;
const intArray* _method_ordering;
GrowableArray<Method*>* _all_mirandas;
enum { fixed_buffer_size = 128 };
u_char _linenumbertable_buffer[fixed_buffer_size];
// Size of Java vtable (in words)
int _vtable_size;
int _itable_size;
int _num_miranda_methods;
ReferenceType _rt;
Handle _protection_domain;
AccessFlags _access_flags;
// for tracing and notifications
Publicity _pub_level;
// Used to keep track of whether a constant pool item 19 or 20 is found. These
// correspond to CONSTANT_Module and CONSTANT_Package tags and are not allowed
// in regular class files. For class file version >= 53, a CFE cannot be thrown
// immediately when these are seen because a NCDFE must be thrown if the class's
// access_flags have ACC_MODULE set. But, the access_flags haven't been looked
// at yet. So, the bad constant pool item is cached here. A value of zero
// means that no constant pool item 19 or 20 was found.
short _bad_constant_seen;
// class attributes parsed before the instance klass is created:
bool _synthetic_flag;
int _sde_length;
const char* _sde_buffer;
u2 _sourcefile_index;
u2 _generic_signature_index;
u2 _major_version;
u2 _minor_version;
u2 _this_class_index;
u2 _super_class_index;
u2 _itfs_len;
u2 _java_fields_count;
bool _need_verify;
bool _relax_verify;
bool _has_nonstatic_concrete_methods;
bool _declares_nonstatic_concrete_methods;
bool _has_final_method;
// precomputed flags
bool _has_finalizer;
bool _has_empty_finalizer;
bool _has_vanilla_constructor;
int _max_bootstrap_specifier_index; // detects BSS values
void parse_stream(const ClassFileStream* const stream, TRAPS);
void post_process_parsed_stream(const ClassFileStream* const stream,
ConstantPool* cp,
TRAPS);
void prepend_host_package_name(const InstanceKlass* unsafe_anonymous_host, TRAPS);
void fix_unsafe_anonymous_class_name(TRAPS);
void fill_instance_klass(InstanceKlass* ik, bool cf_changed_in_CFLH, TRAPS);
void set_klass(InstanceKlass* instance);
void set_class_bad_constant_seen(short bad_constant);
short class_bad_constant_seen() { return _bad_constant_seen; }
void set_class_synthetic_flag(bool x) { _synthetic_flag = x; }
void set_class_sourcefile_index(u2 x) { _sourcefile_index = x; }
void set_class_generic_signature_index(u2 x) { _generic_signature_index = x; }
void set_class_sde_buffer(const char* x, int len) { _sde_buffer = x; _sde_length = len; }
void create_combined_annotations(TRAPS);
void apply_parsed_class_attributes(InstanceKlass* k); // update k
void apply_parsed_class_metadata(InstanceKlass* k, int fields_count, TRAPS);
void clear_class_metadata();
// Constant pool parsing
void parse_constant_pool_entries(const ClassFileStream* const stream,
ConstantPool* cp,
const int length,
TRAPS);
void parse_constant_pool(const ClassFileStream* const cfs,
ConstantPool* const cp,
const int length,
TRAPS);
// Interface parsing
void parse_interfaces(const ClassFileStream* const stream,
const int itfs_len,
ConstantPool* const cp,
bool* has_nonstatic_concrete_methods,
TRAPS);
const InstanceKlass* parse_super_class(ConstantPool* const cp,
const int super_class_index,
const bool need_verify,
TRAPS);
// Field parsing
void parse_field_attributes(const ClassFileStream* const cfs,
u2 attributes_count,
bool is_static,
u2 signature_index,
u2* const constantvalue_index_addr,
bool* const is_synthetic_addr,
u2* const generic_signature_index_addr,
FieldAnnotationCollector* parsed_annotations,
TRAPS);
void parse_fields(const ClassFileStream* const cfs,
bool is_interface,
FieldAllocationCount* const fac,
ConstantPool* cp,
const int cp_size,
u2* const java_fields_count_ptr,
TRAPS);
// Method parsing
Method* parse_method(const ClassFileStream* const cfs,
bool is_interface,
const ConstantPool* cp,
AccessFlags* const promoted_flags,
TRAPS);
void parse_methods(const ClassFileStream* const cfs,
bool is_interface,
AccessFlags* const promoted_flags,
bool* const has_final_method,
bool* const declares_nonstatic_concrete_methods,
TRAPS);
const unsafe_u2* parse_exception_table(const ClassFileStream* const stream,
u4 code_length,
u4 exception_table_length,
TRAPS);
void parse_linenumber_table(u4 code_attribute_length,
u4 code_length,
CompressedLineNumberWriteStream**const write_stream,
TRAPS);
const unsafe_u2* parse_localvariable_table(const ClassFileStream* const cfs,
u4 code_length,
u2 max_locals,
u4 code_attribute_length,
u2* const localvariable_table_length,
bool isLVTT,
TRAPS);
const unsafe_u2* parse_checked_exceptions(const ClassFileStream* const cfs,
u2* const checked_exceptions_length,
u4 method_attribute_length,
TRAPS);
// Classfile attribute parsing
u2 parse_generic_signature_attribute(const ClassFileStream* const cfs, TRAPS);
void parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs, TRAPS);
void parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
int length,
TRAPS);
u2 parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
const u1* const inner_classes_attribute_start,
bool parsed_enclosingmethod_attribute,
u2 enclosing_method_class_index,
u2 enclosing_method_method_index,
TRAPS);
u2 parse_classfile_nest_members_attribute(const ClassFileStream* const cfs,
const u1* const nest_members_attribute_start,
TRAPS);
u2 parse_classfile_record_attribute(const ClassFileStream* const cfs,
const ConstantPool* cp,
const u1* const record_attribute_start,
TRAPS);
bool supports_records();
void parse_classfile_attributes(const ClassFileStream* const cfs,
ConstantPool* cp,
ClassAnnotationCollector* parsed_annotations,
TRAPS);
void parse_classfile_synthetic_attribute(TRAPS);
void parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS);
void parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
ConstantPool* cp,
u4 attribute_length,
TRAPS);
// Annotations handling
AnnotationArray* assemble_annotations(const u1* const runtime_visible_annotations,
int runtime_visible_annotations_length,
const u1* const runtime_invisible_annotations,
int runtime_invisible_annotations_length,
TRAPS);
void set_precomputed_flags(InstanceKlass* k);
// Format checker methods
void classfile_parse_error(const char* msg, TRAPS) const;
void classfile_parse_error(const char* msg, int index, TRAPS) const;
void classfile_parse_error(const char* msg, const char *name, TRAPS) const;
void classfile_parse_error(const char* msg,
int index,
const char *name,
TRAPS) const;
void classfile_parse_error(const char* msg,
const char* name,
const char* signature,
TRAPS) const;
inline void guarantee_property(bool b, const char* msg, TRAPS) const {
if (!b) { classfile_parse_error(msg, CHECK); }
}
void report_assert_property_failure(const char* msg, TRAPS) const PRODUCT_RETURN;
void report_assert_property_failure(const char* msg, int index, TRAPS) const PRODUCT_RETURN;
inline void assert_property(bool b, const char* msg, TRAPS) const {
#ifdef ASSERT
if (!b) {
report_assert_property_failure(msg, THREAD);
}
#endif
}
inline void assert_property(bool b, const char* msg, int index, TRAPS) const {
#ifdef ASSERT
if (!b) {
report_assert_property_failure(msg, index, THREAD);
}
#endif
}
inline void check_property(bool property,
const char* msg,
int index,
TRAPS) const {
if (_need_verify) {
guarantee_property(property, msg, index, CHECK);
} else {
assert_property(property, msg, index, CHECK);
}
}
inline void check_property(bool property, const char* msg, TRAPS) const {
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) const {
if (!b) { classfile_parse_error(msg, index, CHECK); }
}
inline void guarantee_property(bool b,
const char* msg,
const char *name,
TRAPS) const {
if (!b) { classfile_parse_error(msg, name, CHECK); }
}
inline void guarantee_property(bool b,
const char* msg,
int index,
const char *name,
TRAPS) const {
if (!b) { classfile_parse_error(msg, index, name, CHECK); }
}
void throwIllegalSignature(const char* type,
const Symbol* name,
const Symbol* sig,
TRAPS) const;
void verify_constantvalue(const ConstantPool* const cp,
int constantvalue_index,
int signature_index,
TRAPS) const;
void verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) const;
void verify_legal_class_name(const Symbol* name, TRAPS) const;
void verify_legal_field_name(const Symbol* name, TRAPS) const;
void verify_legal_method_name(const Symbol* name, TRAPS) const;
void verify_legal_field_signature(const Symbol* fieldname,
const Symbol* signature,
TRAPS) const;
int verify_legal_method_signature(const Symbol* methodname,
const Symbol* signature,
TRAPS) const;
void verify_legal_class_modifiers(jint flags, TRAPS) const;
void verify_legal_field_modifiers(jint flags, bool is_interface, TRAPS) const;
void verify_legal_method_modifiers(jint flags,
bool is_interface,
const Symbol* name,
TRAPS) const;
const char* skip_over_field_signature(const char* signature,
bool void_ok,
unsigned int length,
TRAPS) const;
bool has_cp_patch_at(int index) const {
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) const {
assert(has_cp_patch_at(index), "oob");
return _cp_patches->at(index);
}
Handle clear_cp_patch_at(int index);
void patch_class(ConstantPool* cp, int class_index, Klass* k, Symbol* name);
void patch_constant_pool(ConstantPool* cp,
int index,
Handle patch,
TRAPS);
// Wrapper for constantTag.is_klass_[or_]reference.
// In older versions of the VM, Klass*s 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 valid_klass_reference_at(int index) const {
return _cp->is_within_bounds(index) &&
_cp->tag_at(index).is_klass_or_reference();
}
// Checks that the cpool index is in range and is a utf8
bool valid_symbol_at(int cpool_index) const {
return _cp->is_within_bounds(cpool_index) &&
_cp->tag_at(cpool_index).is_utf8();
}
void copy_localvariable_table(const ConstMethod* cm,
int lvt_cnt,
u2* const localvariable_table_length,
const unsafe_u2** const localvariable_table_start,
int lvtt_cnt,
u2* const localvariable_type_table_length,
const unsafe_u2** const localvariable_type_table_start,
TRAPS);
void copy_method_annotations(ConstMethod* cm,
const u1* runtime_visible_annotations,
int runtime_visible_annotations_length,
const u1* runtime_invisible_annotations,
int runtime_invisible_annotations_length,
const u1* runtime_visible_parameter_annotations,
int runtime_visible_parameter_annotations_length,
const u1* runtime_invisible_parameter_annotations,
int runtime_invisible_parameter_annotations_length,
const u1* runtime_visible_type_annotations,
int runtime_visible_type_annotations_length,
const u1* runtime_invisible_type_annotations,
int runtime_invisible_type_annotations_length,
/**代码未完, 请加载全部代码(NowJava.com).**/
关注时代Java
关注时代Java