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/*
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* Copyright 2003-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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*/
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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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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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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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// 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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