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view src/share/vm/oops/constMethod.hpp @ 12141:cc56f122f3f7
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Reviewed-by: dholmes, rbackman
author | sla |
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date | Thu, 29 Aug 2013 11:05:55 +0200 |
parents | 0c3ee6f1fa23 |
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/* * Copyright (c) 2003, 2013, 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_VM_OOPS_CONSTMETHODOOP_HPP #define SHARE_VM_OOPS_CONSTMETHODOOP_HPP #include "oops/oop.hpp" // An ConstMethod* represents portions of a Java method which // do not vary. // // Memory layout (each line represents a word). Note that most // applications load thousands of methods, so keeping the size of this // structure small has a big impact on footprint. // // |------------------------------------------------------| // | header | // | klass | // |------------------------------------------------------| // | fingerprint 1 | // | fingerprint 2 | // | constants (oop) | // | stackmap_data (oop) | // | constMethod_size | // | interp_kind | flags | code_size | // | name index | signature index | // | method_idnum | max_stack | // | max_locals | size_of_parameters | // |------------------------------------------------------| // | | // | byte codes | // | | // |------------------------------------------------------| // | compressed linenumber table | // | (see class CompressedLineNumberReadStream) | // | (note that length is unknown until decompressed) | // | (access flags bit tells whether table is present) | // | (indexed from start of ConstMethod*) | // | (elements not necessarily sorted!) | // |------------------------------------------------------| // | localvariable table elements + length (length last) | // | (length is u2, elements are 6-tuples of u2) | // | (see class LocalVariableTableElement) | // | (access flags bit tells whether table is present) | // | (indexed from end of ConstMethod*) | // |------------------------------------------------------| // | exception table + length (length last) | // | (length is u2, elements are 4-tuples of u2) | // | (see class ExceptionTableElement) | // | (access flags bit tells whether table is present) | // | (indexed from end of ConstMethod*) | // |------------------------------------------------------| // | checked exceptions elements + length (length last) | // | (length is u2, elements are u2) | // | (see class CheckedExceptionElement) | // | (access flags bit tells whether table is present) | // | (indexed from end of ConstMethod*) | // |------------------------------------------------------| // | method parameters elements + length (length last) | // | (length is u2, elements are u2, u4 structures) | // | (see class MethodParametersElement) | // | (access flags bit tells whether table is present) | // | (indexed from end of ConstMethod*) | // |------------------------------------------------------| // | generic signature index (u2) | // | (indexed from start of constMethodOop) | // |------------------------------------------------------| // | annotations arrays - method, parameter, type, default| // | pointer to Array<u1> if annotation is present | // |------------------------------------------------------| // // IMPORTANT: If anything gets added here, there need to be changes to // ensure that ServicabilityAgent doesn't get broken as a result! // Utility class describing elements in checked exceptions table inlined in Method*. class CheckedExceptionElement VALUE_OBJ_CLASS_SPEC { public: u2 class_cp_index; }; // Utility class describing elements in local variable table inlined in Method*. class LocalVariableTableElement VALUE_OBJ_CLASS_SPEC { public: u2 start_bci; u2 length; u2 name_cp_index; u2 descriptor_cp_index; u2 signature_cp_index; u2 slot; }; // Utility class describing elements in exception table class ExceptionTableElement VALUE_OBJ_CLASS_SPEC { public: u2 start_pc; u2 end_pc; u2 handler_pc; u2 catch_type_index; }; // Utility class describing elements in method parameters class MethodParametersElement VALUE_OBJ_CLASS_SPEC { public: u2 name_cp_index; u2 flags; }; class KlassSizeStats; // Class to collect the sizes of ConstMethod inline tables #define INLINE_TABLES_DO(do_element) \ do_element(localvariable_table_length) \ do_element(compressed_linenumber_size) \ do_element(exception_table_length) \ do_element(checked_exceptions_length) \ do_element(method_parameters_length) \ do_element(generic_signature_index) \ do_element(method_annotations_length) \ do_element(parameter_annotations_length) \ do_element(type_annotations_length) \ do_element(default_annotations_length) #define INLINE_TABLE_DECLARE(sym) int _##sym; #define INLINE_TABLE_PARAM(sym) int sym, #define INLINE_TABLE_INIT(sym) _##sym(sym), #define INLINE_TABLE_NULL(sym) _##sym(0), #define INLINE_TABLE_ACCESSOR(sym) int sym() const { return _##sym; } class InlineTableSizes : StackObj { // declarations INLINE_TABLES_DO(INLINE_TABLE_DECLARE) int _end; public: InlineTableSizes( INLINE_TABLES_DO(INLINE_TABLE_PARAM) int end) : INLINE_TABLES_DO(INLINE_TABLE_INIT) _end(end) {} // Default constructor for no inlined tables InlineTableSizes() : INLINE_TABLES_DO(INLINE_TABLE_NULL) _end(0) {} // Accessors INLINE_TABLES_DO(INLINE_TABLE_ACCESSOR) }; #undef INLINE_TABLE_ACCESSOR #undef INLINE_TABLE_NULL #undef INLINE_TABLE_INIT #undef INLINE_TABLE_PARAM #undef INLINE_TABLE_DECLARE class ConstMethod : public MetaspaceObj { friend class VMStructs; public: typedef enum { NORMAL, OVERPASS } MethodType; private: enum { _has_linenumber_table = 0x0001, _has_checked_exceptions = 0x0002, _has_localvariable_table = 0x0004, _has_exception_table = 0x0008, _has_generic_signature = 0x0010, _has_method_parameters = 0x0020, _is_overpass = 0x0040, _has_method_annotations = 0x0080, _has_parameter_annotations = 0x0100, _has_type_annotations = 0x0200, _has_default_annotations = 0x0400 }; // Bit vector of signature // Callers interpret 0=not initialized yet and // -1=too many args to fix, must parse the slow way. // The real initial value is special to account for nonatomicity of 64 bit // loads and stores. This value may updated and read without a lock by // multiple threads, so is volatile. volatile uint64_t _fingerprint; ConstantPool* _constants; // Constant pool // Raw stackmap data for the method Array<u1>* _stackmap_data; int _constMethod_size; u2 _flags; // Size of Java bytecodes allocated immediately after Method*. u2 _code_size; u2 _name_index; // Method name (index in constant pool) u2 _signature_index; // Method signature (index in constant pool) u2 _method_idnum; // unique identification number for the method within the class // initially corresponds to the index into the methods array. // but this may change with redefinition u2 _max_stack; // Maximum number of entries on the expression stack u2 _max_locals; // Number of local variables used by this method u2 _size_of_parameters; // size of the parameter block (receiver + arguments) in words // Constructor ConstMethod(int byte_code_size, InlineTableSizes* sizes, MethodType is_overpass, int size); public: static ConstMethod* allocate(ClassLoaderData* loader_data, int byte_code_size, InlineTableSizes* sizes, MethodType mt, TRAPS); bool is_constMethod() const { return true; } // Inlined tables void set_inlined_tables_length(InlineTableSizes* sizes); bool has_generic_signature() const { return (_flags & _has_generic_signature) != 0; } bool has_linenumber_table() const { return (_flags & _has_linenumber_table) != 0; } bool has_checked_exceptions() const { return (_flags & _has_checked_exceptions) != 0; } bool has_localvariable_table() const { return (_flags & _has_localvariable_table) != 0; } bool has_exception_handler() const { return (_flags & _has_exception_table) != 0; } bool has_method_parameters() const { return (_flags & _has_method_parameters) != 0; } MethodType method_type() const { return ((_flags & _is_overpass) == 0) ? NORMAL : OVERPASS; } void set_method_type(MethodType mt) { if (mt == NORMAL) { _flags &= ~(_is_overpass); } else { _flags |= _is_overpass; } } // constant pool ConstantPool* constants() const { return _constants; } void set_constants(ConstantPool* c) { _constants = c; } Method* method() const; // stackmap table data Array<u1>* stackmap_data() const { return _stackmap_data; } void set_stackmap_data(Array<u1>* sd) { _stackmap_data = sd; } void copy_stackmap_data(ClassLoaderData* loader_data, u1* sd, int length, TRAPS); bool has_stackmap_table() const { return _stackmap_data != NULL; } void init_fingerprint() { const uint64_t initval = CONST64(0x8000000000000000); _fingerprint = initval; } uint64_t fingerprint() const { // Since reads aren't atomic for 64 bits, if any of the high or low order // word is the initial value, return 0. See init_fingerprint for initval. uint high_fp = (uint)(_fingerprint >> 32); if ((int) _fingerprint == 0 || high_fp == 0x80000000) { return 0L; } else { return _fingerprint; } } uint64_t set_fingerprint(uint64_t new_fingerprint) { #ifdef ASSERT // Assert only valid if complete/valid 64 bit _fingerprint value is read. uint64_t oldfp = fingerprint(); #endif // ASSERT _fingerprint = new_fingerprint; assert(oldfp == 0L || new_fingerprint == oldfp, "fingerprint cannot change"); assert(((new_fingerprint >> 32) != 0x80000000) && (int)new_fingerprint !=0, "fingerprint should call init to set initial value"); return new_fingerprint; } // name int name_index() const { return _name_index; } void set_name_index(int index) { _name_index = index; } // signature int signature_index() const { return _signature_index; } void set_signature_index(int index) { _signature_index = index; } // generics support int generic_signature_index() const { if (has_generic_signature()) { return *generic_signature_index_addr(); } else { return 0; } } void set_generic_signature_index(u2 index) { assert(has_generic_signature(), ""); u2* addr = generic_signature_index_addr(); *addr = index; } // Sizing static int header_size() { return sizeof(ConstMethod)/HeapWordSize; } // Size needed static int size(int code_size, InlineTableSizes* sizes); int size() const { return _constMethod_size;} void set_constMethod_size(int size) { _constMethod_size = size; } #if INCLUDE_SERVICES void collect_statistics(KlassSizeStats *sz) const; #endif // code size int code_size() const { return _code_size; } void set_code_size(int size) { assert(max_method_code_size < (1 << 16), "u2 is too small to hold method code size in general"); assert(0 <= size && size <= max_method_code_size, "invalid code size"); _code_size = size; } // linenumber table - note that length is unknown until decompression, // see class CompressedLineNumberReadStream. u_char* compressed_linenumber_table() const; // not preserved by gc u2* generic_signature_index_addr() const; u2* checked_exceptions_length_addr() const; u2* localvariable_table_length_addr() const; u2* exception_table_length_addr() const; u2* method_parameters_length_addr() const; // checked exceptions int checked_exceptions_length() const; CheckedExceptionElement* checked_exceptions_start() const; // localvariable table int localvariable_table_length() const; LocalVariableTableElement* localvariable_table_start() const; // exception table int exception_table_length() const; ExceptionTableElement* exception_table_start() const; // method parameters table int method_parameters_length() const; MethodParametersElement* method_parameters_start() const; // method annotations bool has_method_annotations() const { return (_flags & _has_method_annotations) != 0; } bool has_parameter_annotations() const { return (_flags & _has_parameter_annotations) != 0; } bool has_type_annotations() const { return (_flags & _has_type_annotations) != 0; } bool has_default_annotations() const { return (_flags & _has_default_annotations) != 0; } AnnotationArray** method_annotations_addr() const; AnnotationArray* method_annotations() const { return has_method_annotations() ? *(method_annotations_addr()) : NULL; } void set_method_annotations(AnnotationArray* anno) { *(method_annotations_addr()) = anno; } AnnotationArray** parameter_annotations_addr() const; AnnotationArray* parameter_annotations() const { return has_parameter_annotations() ? *(parameter_annotations_addr()) : NULL; } void set_parameter_annotations(AnnotationArray* anno) { *(parameter_annotations_addr()) = anno; } AnnotationArray** type_annotations_addr() const; AnnotationArray* type_annotations() const { return has_type_annotations() ? *(type_annotations_addr()) : NULL; } void set_type_annotations(AnnotationArray* anno) { *(type_annotations_addr()) = anno; } AnnotationArray** default_annotations_addr() const; AnnotationArray* default_annotations() const { return has_default_annotations() ? *(default_annotations_addr()) : NULL; } void set_default_annotations(AnnotationArray* anno) { *(default_annotations_addr()) = anno; } int method_annotations_length() const { return has_method_annotations() ? method_annotations()->length() : 0; } int parameter_annotations_length() const { return has_parameter_annotations() ? parameter_annotations()->length() : 0; } int type_annotations_length() const { return has_type_annotations() ? type_annotations()->length() : 0; } int default_annotations_length() const { return has_default_annotations() ? default_annotations()->length() : 0; } // Copy annotations from other ConstMethod void copy_annotations_from(ConstMethod* cm); // byte codes void set_code(address code) { if (code_size() > 0) { memcpy(code_base(), code, code_size()); } } address code_base() const { return (address) (this+1); } address code_end() const { return code_base() + code_size(); } bool contains(address bcp) const { return code_base() <= bcp && bcp < code_end(); } // Offset to bytecodes static ByteSize codes_offset() { return in_ByteSize(sizeof(ConstMethod)); } static ByteSize constants_offset() { return byte_offset_of(ConstMethod, _constants); } static ByteSize max_stack_offset() { return byte_offset_of(ConstMethod, _max_stack); } static ByteSize size_of_locals_offset() { return byte_offset_of(ConstMethod, _max_locals); } static ByteSize size_of_parameters_offset() { return byte_offset_of(ConstMethod, _size_of_parameters); } // Unique id for the method static const u2 MAX_IDNUM; static const u2 UNSET_IDNUM; u2 method_idnum() const { return _method_idnum; } void set_method_idnum(u2 idnum) { _method_idnum = idnum; } // max stack int max_stack() const { return _max_stack; } void set_max_stack(int size) { _max_stack = size; } // max locals int max_locals() const { return _max_locals; } void set_max_locals(int size) { _max_locals = size; } // size of parameters int size_of_parameters() const { return _size_of_parameters; } void set_size_of_parameters(int size) { _size_of_parameters = size; } // Deallocation for RedefineClasses void deallocate_contents(ClassLoaderData* loader_data); bool is_klass() const { return false; } DEBUG_ONLY(bool on_stack() { return false; }) private: // Since the size of the compressed line number table is unknown, the // offsets of the other variable sized sections are computed backwards // from the end of the ConstMethod*. // First byte after ConstMethod* address constMethod_end() const { return (address)((intptr_t*)this + _constMethod_size); } // Last short in ConstMethod* u2* last_u2_element() const; public: // Printing void print_on (outputStream* st) const; void print_value_on(outputStream* st) const; const char* internal_name() const { return "{constMethod}"; } // Verify void verify_on(outputStream* st); }; #endif // SHARE_VM_OOPS_CONSTMETHODOOP_HPP