Mercurial > hg > graal-compiler
diff src/share/vm/oops/constMethodOop.hpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
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children | 0af8b0718fc9 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/oops/constMethodOop.hpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,295 @@ +/* + * Copyright 2003-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + */ + +// 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 | +// | method (oop) | +// | stackmap_data (oop) | +// | exception_table (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 contMethodOop) | +// |------------------------------------------------------| +// | 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; +}; + + +class constMethodOopDesc : public oopDesc { + friend class constMethodKlass; + friend class VMStructs; +private: + enum { + _has_linenumber_table = 1, + _has_checked_exceptions = 2, + _has_localvariable_table = 4 + }; + + // 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; + +public: + oop* oop_block_beg() const { return adr_method(); } + oop* oop_block_end() const { return adr_exception_table() + 1; } + +private: + // + // The oop block. See comment in klass.hpp before making changes. + // + + // Backpointer to non-const methodOop (needed for some JVMTI operations) + methodOop _method; + + // Raw stackmap data for the method + typeArrayOop _stackmap_data; + + // The exception handler table. 4-tuples of ints [start_pc, end_pc, + // handler_pc, catch_type index] For methods with no exceptions the + // table is pointing to Universe::the_empty_int_array + typeArrayOop _exception_table; + + // + // 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); + + 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; } + + void set_interpreter_kind(int kind) { _interpreter_kind = kind; } + int interpreter_kind(void) const { return _interpreter_kind; } + + // backpointer to non-const methodOop + methodOop method() const { return _method; } + void set_method(methodOop m) { oop_store_without_check((oop*)&_method, (oop) m); } + + + // 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; } + + // exception handler table + typeArrayOop exception_table() const { return _exception_table; } + void set_exception_table(typeArrayOop e) { oop_store_without_check((oop*) &_exception_table, (oop) e); } + bool has_exception_handler() const { return exception_table() != NULL && exception_table()->length() > 0; } + + 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 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; + + // checked exceptions + int checked_exceptions_length() const; + CheckedExceptionElement* checked_exceptions_start() const; + + // localvariable table + int localvariable_table_length() const; + LocalVariableTableElement* localvariable_table_start() const; + + // byte codes + 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 exception_table_offset() + { return byte_offset_of(constMethodOopDesc, _exception_table); } + + // Garbage collection support + oop* adr_method() const { return (oop*)&_method; } + oop* adr_stackmap_data() const { return (oop*)&_stackmap_data; } + oop* adr_exception_table() const { return (oop*)&_exception_table; } + + // 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; } +};