| /* |
| * 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" |
| #include "oops/typeArrayOop.hpp" |
| |
| // An constMethodOop 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 constMethodOop) | |
| // | (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 constMethodOop) | |
| // |------------------------------------------------------| |
| // | 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 constMethodOop) | |
| // |------------------------------------------------------| |
| // | 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 constMethodOop) | |
| // |------------------------------------------------------| |
| |
| |
| // Utitily class decribing elements in checked exceptions table inlined in methodOop. |
| class CheckedExceptionElement VALUE_OBJ_CLASS_SPEC { |
| public: |
| u2 class_cp_index; |
| }; |
| |
| |
| // Utitily class decribing elements in local variable table inlined in methodOop. |
| 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 constMethodOopDesc : public oopDesc { |
| friend class constMethodKlass; |
| 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; |
| volatile bool _is_conc_safe; // if true, safe for concurrent GC processing |
| |
| public: |
| oop* oop_block_beg() const { return adr_constants(); } |
| oop* oop_block_end() const { return adr_stackmap_data() + 1; } |
| |
| private: |
| // |
| // The oop block. See comment in klass.hpp before making changes. |
| // |
| |
| constantPoolOop _constants; // Constant pool |
| |
| // Raw stackmap data for the method |
| typeArrayOop _stackmap_data; |
| |
| // |
| // End of the oop block. |
| // |
| |
| int _constMethod_size; |
| jbyte _interpreter_kind; |
| jbyte _flags; |
| |
| // Size of Java bytecodes allocated immediately after methodOop. |
| 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) |
| |
| public: |
| // 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 |
| constantPoolOop constants() const { return _constants; } |
| void set_constants(constantPoolOop c) { |
| oop_store_without_check((oop*)&_constants, (oop)c); |
| } |
| |
| methodOop method() const; |
| |
| // stackmap table data |
| typeArrayOop stackmap_data() const { return _stackmap_data; } |
| void set_stackmap_data(typeArrayOop sd) { |
| oop_store_without_check((oop*)&_stackmap_data, (oop)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(constMethodOopDesc)/HeapWordSize; |
| } |
| |
| // Object size needed |
| static int object_size(int code_size, int compressed_line_number_size, |
| int local_variable_table_length, |
| int exception_table_length, |
| int checked_exceptions_length); |
| |
| int object_size() const { return _constMethod_size; } |
| void set_constMethod_size(int size) { _constMethod_size = size; } |
| // Is object parsable by gc |
| bool object_is_parsable() { return object_size() > 0; } |
| |
| // 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(constMethodOopDesc)); } |
| |
| // interpreter support |
| static ByteSize constants_offset() |
| { return byte_offset_of(constMethodOopDesc, _constants); } |
| |
| // Garbage collection support |
| oop* adr_constants() const { return (oop*)&_constants; } |
| oop* adr_stackmap_data() const { return (oop*)&_stackmap_data; } |
| bool is_conc_safe() { return _is_conc_safe; } |
| void set_is_conc_safe(bool v) { _is_conc_safe = v; } |
| |
| // 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; } |
| |
| 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 constMethodOop. |
| |
| // First byte after constMethodOop |
| address constMethod_end() const |
| { return (address)((oop*)this + _constMethod_size); } |
| |
| // Last short in constMethodOop |
| u2* last_u2_element() const |
| { return (u2*)constMethod_end() - 1; } |
| }; |
| |
| #endif // SHARE_VM_OOPS_CONSTMETHODOOP_HPP |