Mercurial > hg > truffle
view src/share/vm/compiler/oopMap.hpp @ 8733:9def4075da6d
8008079: G1: Add nextObject routine to CMBitMapRO and replace nextWord
Summary: Update the task local finger to the start of the next object when marking aborts, in order to avoid the redundant scanning of all 0's when the marking task restarts, if otherwise updating to the next word. In addition, reuse the routine nextObject() in routine iterate().
Reviewed-by: johnc, ysr
Contributed-by: tamao <tao.mao@oracle.com>
author | tamao |
---|---|
date | Tue, 05 Mar 2013 15:36:56 -0800 |
parents | f95d63e2154a |
children | 06f017f7daa7 |
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/* * Copyright (c) 1998, 2010, 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_COMPILER_OOPMAP_HPP #define SHARE_VM_COMPILER_OOPMAP_HPP #include "code/compressedStream.hpp" #include "code/vmreg.hpp" #include "memory/allocation.hpp" #include "utilities/growableArray.hpp" // Interface for generating the frame map for compiled code. A frame map // describes for a specific pc whether each register and frame stack slot is: // Oop - A GC root for current frame // Value - Live non-oop, non-float value: int, either half of double // Dead - Dead; can be Zapped for debugging // CalleeXX - Callee saved; also describes which caller register is saved // DerivedXX - A derived oop; original oop is described. // // OopMapValue describes a single OopMap entry class frame; class RegisterMap; class DerivedPointerEntry; class OopMapValue: public StackObj { friend class VMStructs; private: short _value; int value() const { return _value; } void set_value(int value) { _value = value; } short _content_reg; public: // Constants enum { type_bits = 5, register_bits = BitsPerShort - type_bits }; enum { type_shift = 0, register_shift = type_bits }; enum { type_mask = right_n_bits(type_bits), type_mask_in_place = type_mask << type_shift, register_mask = right_n_bits(register_bits), register_mask_in_place = register_mask << register_shift }; enum oop_types { // must fit in type_bits unused_value =0, // powers of 2, for masking OopMapStream oop_value = 1, value_value = 2, narrowoop_value = 4, callee_saved_value = 8, derived_oop_value= 16 }; // Constructors OopMapValue () { set_value(0); set_content_reg(VMRegImpl::Bad()); } OopMapValue (VMReg reg, oop_types t) { set_reg_type(reg,t); } OopMapValue (VMReg reg, oop_types t, VMReg reg2) { set_reg_type(reg,t); set_content_reg(reg2); } OopMapValue (CompressedReadStream* stream) { read_from(stream); } // Archiving void write_on(CompressedWriteStream* stream) { stream->write_int(value()); if(is_callee_saved() || is_derived_oop()) { stream->write_int(content_reg()->value()); } } void read_from(CompressedReadStream* stream) { set_value(stream->read_int()); if(is_callee_saved() || is_derived_oop()) { set_content_reg(VMRegImpl::as_VMReg(stream->read_int(), true)); } } // Querying bool is_oop() { return mask_bits(value(), type_mask_in_place) == oop_value; } bool is_value() { return mask_bits(value(), type_mask_in_place) == value_value; } bool is_narrowoop() { return mask_bits(value(), type_mask_in_place) == narrowoop_value; } bool is_callee_saved() { return mask_bits(value(), type_mask_in_place) == callee_saved_value; } bool is_derived_oop() { return mask_bits(value(), type_mask_in_place) == derived_oop_value; } void set_oop() { set_value((value() & register_mask_in_place) | oop_value); } void set_value() { set_value((value() & register_mask_in_place) | value_value); } void set_narrowoop() { set_value((value() & register_mask_in_place) | narrowoop_value); } void set_callee_saved() { set_value((value() & register_mask_in_place) | callee_saved_value); } void set_derived_oop() { set_value((value() & register_mask_in_place) | derived_oop_value); } VMReg reg() const { return VMRegImpl::as_VMReg(mask_bits(value(), register_mask_in_place) >> register_shift); } oop_types type() const { return (oop_types)mask_bits(value(), type_mask_in_place); } static bool legal_vm_reg_name(VMReg p) { return (p->value() == (p->value() & register_mask)); } void set_reg_type(VMReg p, oop_types t) { set_value((p->value() << register_shift) | t); assert(reg() == p, "sanity check" ); assert(type() == t, "sanity check" ); } VMReg content_reg() const { return VMRegImpl::as_VMReg(_content_reg, true); } void set_content_reg(VMReg r) { _content_reg = r->value(); } // Physical location queries bool is_register_loc() { return reg()->is_reg(); } bool is_stack_loc() { return reg()->is_stack(); } // Returns offset from sp. int stack_offset() { assert(is_stack_loc(), "must be stack location"); return reg()->reg2stack(); } void print_on(outputStream* st) const; void print() const { print_on(tty); } }; class OopMap: public ResourceObj { friend class OopMapStream; friend class VMStructs; private: int _pc_offset; int _omv_count; int _omv_data_size; unsigned char* _omv_data; CompressedWriteStream* _write_stream; debug_only( OopMapValue::oop_types* _locs_used; int _locs_length;) // Accessors unsigned char* omv_data() const { return _omv_data; } void set_omv_data(unsigned char* value) { _omv_data = value; } int omv_data_size() const { return _omv_data_size; } void set_omv_data_size(int value) { _omv_data_size = value; } int omv_count() const { return _omv_count; } void set_omv_count(int value) { _omv_count = value; } void increment_count() { _omv_count++; } CompressedWriteStream* write_stream() const { return _write_stream; } void set_write_stream(CompressedWriteStream* value) { _write_stream = value; } private: enum DeepCopyToken { _deep_copy_token }; OopMap(DeepCopyToken, OopMap* source); // used only by deep_copy public: OopMap(int frame_size, int arg_count); // pc-offset handling int offset() const { return _pc_offset; } void set_offset(int o) { _pc_offset = o; } // Check to avoid double insertion debug_only(OopMapValue::oop_types locs_used( int indx ) { return _locs_used[indx]; }) // Construction // frame_size units are stack-slots (4 bytes) NOT intptr_t; we can name odd // slots to hold 4-byte values like ints and floats in the LP64 build. void set_oop ( VMReg local); void set_value( VMReg local); void set_narrowoop(VMReg local); void set_dead ( VMReg local); void set_callee_saved( VMReg local, VMReg caller_machine_register ); void set_derived_oop ( VMReg local, VMReg derived_from_local_register ); void set_xxx(VMReg reg, OopMapValue::oop_types x, VMReg optional); int heap_size() const; void copy_to(address addr); OopMap* deep_copy(); bool has_derived_pointer() const PRODUCT_RETURN0; bool legal_vm_reg_name(VMReg local) { return OopMapValue::legal_vm_reg_name(local); } // Printing void print_on(outputStream* st) const; void print() const { print_on(tty); } }; class OopMapSet : public ResourceObj { friend class VMStructs; private: int _om_count; int _om_size; OopMap** _om_data; int om_count() const { return _om_count; } void set_om_count(int value) { _om_count = value; } void increment_count() { _om_count++; } int om_size() const { return _om_size; } void set_om_size(int value) { _om_size = value; } OopMap** om_data() const { return _om_data; } void set_om_data(OopMap** value) { _om_data = value; } void grow_om_data(); void set(int index,OopMap* value) { assert((index == 0) || ((index > 0) && (index < om_size())),"bad index"); _om_data[index] = value; } public: OopMapSet(); // returns the number of OopMaps in this OopMapSet int size() const { return _om_count; } // returns the OopMap at a given index OopMap* at(int index) const { assert((index >= 0) && (index <= om_count()),"bad index"); return _om_data[index]; } // Collect OopMaps. void add_gc_map(int pc, OopMap* map); // Returns the only oop map. Used for reconstructing // Adapter frames during deoptimization OopMap* singular_oop_map(); // returns OopMap in that is anchored to the pc OopMap* find_map_at_offset(int pc_offset) const; int heap_size() const; void copy_to(address addr); // Methods oops_do() and all_do() filter out NULL oops and // oop == Universe::narrow_oop_base() before passing oops // to closures. // Iterates through frame for a compiled method static void oops_do (const frame* fr, const RegisterMap* reg_map, OopClosure* f); static void update_register_map(const frame* fr, RegisterMap *reg_map); // Iterates through frame for a compiled method for dead ones and values, too static void all_do(const frame* fr, const RegisterMap* reg_map, OopClosure* oop_fn, void derived_oop_fn(oop* base, oop* derived), OopClosure* value_fn); // Printing void print_on(outputStream* st) const; void print() const { print_on(tty); } }; class OopMapStream : public StackObj { private: CompressedReadStream* _stream; int _mask; int _size; int _position; bool _valid_omv; OopMapValue _omv; void find_next(); public: OopMapStream(OopMap* oop_map); OopMapStream(OopMap* oop_map, int oop_types_mask); bool is_done() { if(!_valid_omv) { find_next(); } return !_valid_omv; } void next() { find_next(); } OopMapValue current() { return _omv; } }; // Derived pointer support. This table keeps track of all derived points on a // stack. It is cleared before each scavenge/GC. During the traversal of all // oops, it is filled in with references to all locations that contains a // derived oop (assumed to be very few). When the GC is complete, the derived // pointers are updated based on their base pointers new value and an offset. #ifdef COMPILER2 class DerivedPointerTable : public AllStatic { friend class VMStructs; private: static GrowableArray<DerivedPointerEntry*>* _list; static bool _active; // do not record pointers for verify pass etc. public: static void clear(); // Called before scavenge/GC static void add(oop *derived, oop *base); // Called during scavenge/GC static void update_pointers(); // Called after scavenge/GC static bool is_empty() { return _list == NULL || _list->is_empty(); } static bool is_active() { return _active; } static void set_active(bool value) { _active = value; } }; // A utility class to temporarily "deactivate" the DerivedPointerTable. // (Note: clients are responsible for any MT-safety issues) class DerivedPointerTableDeactivate: public StackObj { private: bool _active; public: DerivedPointerTableDeactivate() { _active = DerivedPointerTable::is_active(); if (_active) { DerivedPointerTable::set_active(false); } } ~DerivedPointerTableDeactivate() { assert(!DerivedPointerTable::is_active(), "Inconsistency: not MT-safe"); if (_active) { DerivedPointerTable::set_active(true); } } }; #endif // COMPILER2 #endif // SHARE_VM_COMPILER_OOPMAP_HPP