Mercurial > hg > graal-compiler
diff src/share/vm/oops/constMethod.hpp @ 6725:da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
author | coleenp |
---|---|
date | Sat, 01 Sep 2012 13:25:18 -0400 |
parents | src/share/vm/oops/constMethodOop.hpp@8150fa46d2ed |
children | 4735d2c84362 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/oops/constMethod.hpp Sat Sep 01 13:25:18 2012 -0400 @@ -0,0 +1,331 @@ +/* + * Copyright (c) 2003, 2012, 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 | generic_signature_index | +// |------------------------------------------------------| +// | | +// | 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*) | +// |------------------------------------------------------| + + +// Utitily class decribing elements in checked exceptions table inlined in Method*. +class CheckedExceptionElement VALUE_OBJ_CLASS_SPEC { + public: + u2 class_cp_index; +}; + + +// Utitily class decribing 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; +}; + +// Utitily 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; +}; + + +class ConstMethod : public MetaspaceObj { + friend class VMStructs; +private: + enum { + _has_linenumber_table = 1, + _has_checked_exceptions = 2, + _has_localvariable_table = 4, + _has_exception_table = 8 + }; + + // 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; + jbyte _interpreter_kind; + jbyte _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 _generic_signature_index; // Generic signature (index in constant pool, 0 if absent) + + + // Constructor + ConstMethod(int byte_code_size, + int compressed_line_number_size, + int localvariable_table_length, + int exception_table_length, + int checked_exceptions_length, + int size); +public: + static ConstMethod* allocate(ClassLoaderData* loader_data, + int byte_code_size, + int compressed_line_number_size, + int localvariable_table_length, + int exception_table_length, + int checked_exceptions_length, + TRAPS); + + bool is_constMethod() const { return true; } + + // Inlined tables + void set_inlined_tables_length(int checked_exceptions_len, + int compressed_line_number_size, + int localvariable_table_len, + int exception_table_len); + + 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; } + + void set_interpreter_kind(int kind) { _interpreter_kind = kind; } + int interpreter_kind(void) const { return _interpreter_kind; } + + // 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; } + 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 { return _generic_signature_index; } + void set_generic_signature_index(int index) { _generic_signature_index = index; } + + // Sizing + static int header_size() { + return sizeof(ConstMethod)/HeapWordSize; + } + + // Size needed + static int size(int code_size, int compressed_line_number_size, + int local_variable_table_length, + int exception_table_length, + int checked_exceptions_length); + + int size() const { return _constMethod_size;} + void set_constMethod_size(int size) { _constMethod_size = size; } + + // 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* checked_exceptions_length_addr() const; + u2* localvariable_table_length_addr() const; + u2* exception_table_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; + + // 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); } + + // 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; } + + // 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)((oop*)this + _constMethod_size); } + + // Last short in ConstMethod* + u2* last_u2_element() const + { return (u2*)constMethod_end() - 1; } + + 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