author | stefank |
Tue, 23 Nov 2010 13:22:55 -0800 | |
changeset 7397 | 5b173b4ca846 |
parent 5547 | f4b087cbb361 |
child 12937 | 0032fb2caff6 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#ifndef SHARE_VM_OOPS_CONSTMETHODOOP_HPP |
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#define SHARE_VM_OOPS_CONSTMETHODOOP_HPP |
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#include "oops/oop.hpp" |
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#include "oops/typeArrayOop.hpp" |
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// An constMethodOop represents portions of a Java method which |
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// do not vary. |
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// |
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// Memory layout (each line represents a word). Note that most |
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// applications load thousands of methods, so keeping the size of this |
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// structure small has a big impact on footprint. |
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// |
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// |------------------------------------------------------| |
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// | header | |
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// | klass | |
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// |------------------------------------------------------| |
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// | fingerprint 1 | |
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// | fingerprint 2 | |
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// | method (oop) | |
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// | stackmap_data (oop) | |
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// | exception_table (oop) | |
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// | constMethod_size | |
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// | interp_kind | flags | code_size | |
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// | name index | signature index | |
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// | method_idnum | generic_signature_index | |
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// |------------------------------------------------------| |
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// | | |
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// | byte codes | |
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// | | |
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// |------------------------------------------------------| |
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// | compressed linenumber table | |
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// | (see class CompressedLineNumberReadStream) | |
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// | (note that length is unknown until decompressed) | |
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// | (access flags bit tells whether table is present) | |
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// | (indexed from start of constMethodOop) | |
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// | (elements not necessarily sorted!) | |
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// |------------------------------------------------------| |
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// | localvariable table elements + length (length last) | |
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// | (length is u2, elements are 6-tuples of u2) | |
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// | (see class LocalVariableTableElement) | |
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// | (access flags bit tells whether table is present) | |
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// | (indexed from end of contMethodOop) | |
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// |------------------------------------------------------| |
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// | checked exceptions elements + length (length last) | |
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// | (length is u2, elements are u2) | |
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// | (see class CheckedExceptionElement) | |
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// | (access flags bit tells whether table is present) | |
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// | (indexed from end of constMethodOop) | |
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// |------------------------------------------------------| |
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// Utitily class decribing elements in checked exceptions table inlined in methodOop. |
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class CheckedExceptionElement VALUE_OBJ_CLASS_SPEC { |
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public: |
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u2 class_cp_index; |
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}; |
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// Utitily class decribing elements in local variable table inlined in methodOop. |
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class LocalVariableTableElement VALUE_OBJ_CLASS_SPEC { |
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public: |
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u2 start_bci; |
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u2 length; |
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u2 name_cp_index; |
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u2 descriptor_cp_index; |
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u2 signature_cp_index; |
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u2 slot; |
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}; |
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class constMethodOopDesc : public oopDesc { |
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friend class constMethodKlass; |
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friend class VMStructs; |
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private: |
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enum { |
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_has_linenumber_table = 1, |
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_has_checked_exceptions = 2, |
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_has_localvariable_table = 4 |
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}; |
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// Bit vector of signature |
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// Callers interpret 0=not initialized yet and |
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// -1=too many args to fix, must parse the slow way. |
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// The real initial value is special to account for nonatomicity of 64 bit |
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// loads and stores. This value may updated and read without a lock by |
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// multiple threads, so is volatile. |
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volatile uint64_t _fingerprint; |
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volatile bool _is_conc_safe; // if true, safe for concurrent GC processing |
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public: |
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oop* oop_block_beg() const { return adr_method(); } |
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oop* oop_block_end() const { return adr_exception_table() + 1; } |
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private: |
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// |
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// The oop block. See comment in klass.hpp before making changes. |
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// |
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// Backpointer to non-const methodOop (needed for some JVMTI operations) |
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methodOop _method; |
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// Raw stackmap data for the method |
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typeArrayOop _stackmap_data; |
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// The exception handler table. 4-tuples of ints [start_pc, end_pc, |
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// handler_pc, catch_type index] For methods with no exceptions the |
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// table is pointing to Universe::the_empty_int_array |
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typeArrayOop _exception_table; |
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// |
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// End of the oop block. |
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// |
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int _constMethod_size; |
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jbyte _interpreter_kind; |
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jbyte _flags; |
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// Size of Java bytecodes allocated immediately after methodOop. |
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u2 _code_size; |
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u2 _name_index; // Method name (index in constant pool) |
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u2 _signature_index; // Method signature (index in constant pool) |
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u2 _method_idnum; // unique identification number for the method within the class |
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// initially corresponds to the index into the methods array. |
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// but this may change with redefinition |
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u2 _generic_signature_index; // Generic signature (index in constant pool, 0 if absent) |
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public: |
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// Inlined tables |
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void set_inlined_tables_length(int checked_exceptions_len, |
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int compressed_line_number_size, |
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int localvariable_table_len); |
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bool has_linenumber_table() const |
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{ return (_flags & _has_linenumber_table) != 0; } |
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bool has_checked_exceptions() const |
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{ return (_flags & _has_checked_exceptions) != 0; } |
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bool has_localvariable_table() const |
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{ return (_flags & _has_localvariable_table) != 0; } |
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void set_interpreter_kind(int kind) { _interpreter_kind = kind; } |
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int interpreter_kind(void) const { return _interpreter_kind; } |
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// backpointer to non-const methodOop |
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methodOop method() const { return _method; } |
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void set_method(methodOop m) { oop_store_without_check((oop*)&_method, (oop) m); } |
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// stackmap table data |
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typeArrayOop stackmap_data() const { return _stackmap_data; } |
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void set_stackmap_data(typeArrayOop sd) { |
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oop_store_without_check((oop*)&_stackmap_data, (oop)sd); |
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} |
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bool has_stackmap_table() const { return _stackmap_data != NULL; } |
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// exception handler table |
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typeArrayOop exception_table() const { return _exception_table; } |
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void set_exception_table(typeArrayOop e) { oop_store_without_check((oop*) &_exception_table, (oop) e); } |
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bool has_exception_handler() const { return exception_table() != NULL && exception_table()->length() > 0; } |
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void init_fingerprint() { |
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const uint64_t initval = CONST64(0x8000000000000000); |
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_fingerprint = initval; |
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} |
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uint64_t fingerprint() const { |
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// Since reads aren't atomic for 64 bits, if any of the high or low order |
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// word is the initial value, return 0. See init_fingerprint for initval. |
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uint high_fp = (uint)(_fingerprint >> 32); |
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if ((int) _fingerprint == 0 || high_fp == 0x80000000) { |
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return 0L; |
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} else { |
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return _fingerprint; |
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} |
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} |
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uint64_t set_fingerprint(uint64_t new_fingerprint) { |
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#ifdef ASSERT |
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// Assert only valid if complete/valid 64 bit _fingerprint value is read. |
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uint64_t oldfp = fingerprint(); |
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#endif // ASSERT |
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_fingerprint = new_fingerprint; |
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assert(oldfp == 0L || new_fingerprint == oldfp, |
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"fingerprint cannot change"); |
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assert(((new_fingerprint >> 32) != 0x80000000) && (int)new_fingerprint !=0, |
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"fingerprint should call init to set initial value"); |
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return new_fingerprint; |
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} |
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// name |
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int name_index() const { return _name_index; } |
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void set_name_index(int index) { _name_index = index; } |
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// signature |
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int signature_index() const { return _signature_index; } |
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void set_signature_index(int index) { _signature_index = index; } |
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// generics support |
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int generic_signature_index() const { return _generic_signature_index; } |
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void set_generic_signature_index(int index) { _generic_signature_index = index; } |
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// Sizing |
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static int header_size() { |
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return sizeof(constMethodOopDesc)/HeapWordSize; |
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} |
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// Object size needed |
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static int object_size(int code_size, int compressed_line_number_size, |
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int local_variable_table_length, |
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int checked_exceptions_length); |
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int object_size() const { return _constMethod_size; } |
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void set_constMethod_size(int size) { _constMethod_size = size; } |
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// Is object parsable by gc |
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bool object_is_parsable() { return object_size() > 0; } |
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// code size |
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int code_size() const { return _code_size; } |
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void set_code_size(int size) { |
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assert(max_method_code_size < (1 << 16), |
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"u2 is too small to hold method code size in general"); |
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assert(0 <= size && size <= max_method_code_size, "invalid code size"); |
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_code_size = size; |
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} |
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// linenumber table - note that length is unknown until decompression, |
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// see class CompressedLineNumberReadStream. |
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u_char* compressed_linenumber_table() const; // not preserved by gc |
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u2* checked_exceptions_length_addr() const; |
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u2* localvariable_table_length_addr() const; |
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// checked exceptions |
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int checked_exceptions_length() const; |
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CheckedExceptionElement* checked_exceptions_start() const; |
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// localvariable table |
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int localvariable_table_length() const; |
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LocalVariableTableElement* localvariable_table_start() const; |
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// byte codes |
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void set_code(address code) { |
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if (code_size() > 0) { |
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memcpy(code_base(), code, code_size()); |
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} |
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} |
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address code_base() const { return (address) (this+1); } |
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address code_end() const { return code_base() + code_size(); } |
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bool contains(address bcp) const { return code_base() <= bcp |
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&& bcp < code_end(); } |
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// Offset to bytecodes |
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static ByteSize codes_offset() |
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{ return in_ByteSize(sizeof(constMethodOopDesc)); } |
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// interpreter support |
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static ByteSize exception_table_offset() |
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{ return byte_offset_of(constMethodOopDesc, _exception_table); } |
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// Garbage collection support |
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oop* adr_method() const { return (oop*)&_method; } |
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oop* adr_stackmap_data() const { return (oop*)&_stackmap_data; } |
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oop* adr_exception_table() const { return (oop*)&_exception_table; } |
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bool is_conc_safe() { return _is_conc_safe; } |
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void set_is_conc_safe(bool v) { _is_conc_safe = v; } |
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// Unique id for the method |
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static const u2 MAX_IDNUM; |
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static const u2 UNSET_IDNUM; |
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u2 method_idnum() const { return _method_idnum; } |
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void set_method_idnum(u2 idnum) { _method_idnum = idnum; } |
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private: |
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// Since the size of the compressed line number table is unknown, the |
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// offsets of the other variable sized sections are computed backwards |
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// from the end of the constMethodOop. |
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// First byte after constMethodOop |
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address constMethod_end() const |
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{ return (address)((oop*)this + _constMethod_size); } |
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// Last short in constMethodOop |
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u2* last_u2_element() const |
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{ return (u2*)constMethod_end() - 1; } |
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}; |
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#endif // SHARE_VM_OOPS_CONSTMETHODOOP_HPP |