| /* |
| * Copyright (c) 2002, 2016, 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_RUNTIME_REGISTERMAP_HPP |
| #define SHARE_VM_RUNTIME_REGISTERMAP_HPP |
| |
| #include "code/vmreg.hpp" |
| #include "utilities/globalDefinitions.hpp" |
| #include "utilities/macros.hpp" |
| |
| class JavaThread; |
| |
| // |
| // RegisterMap |
| // |
| // A companion structure used for stack traversal. The RegisterMap contains |
| // misc. information needed in order to do correct stack traversal of stack |
| // frames. Hence, it must always be passed in as an argument to |
| // frame::sender(RegisterMap*). |
| // |
| // In particular, |
| // 1) It provides access to the thread for which the stack belongs. The |
| // thread object is needed in order to get sender of a deoptimized frame. |
| // |
| // 2) It is used to pass information from a callee frame to its caller |
| // frame about how the frame should be traversed. This is used to let |
| // the caller frame take care of calling oops-do of out-going |
| // arguments, when the callee frame is not instantiated yet. This |
| // happens, e.g., when a compiled frame calls into |
| // resolve_virtual_call. (Hence, it is critical that the same |
| // RegisterMap object is used for the entire stack walk. Normally, |
| // this is hidden by using the StackFrameStream.) This is used when |
| // doing follow_oops and oops_do. |
| // |
| // 3) The RegisterMap keeps track of the values of callee-saved registers |
| // from frame to frame (hence, the name). For some stack traversal the |
| // values of the callee-saved registers does not matter, e.g., if you |
| // only need the static properties such as frame type, pc, and such. |
| // Updating of the RegisterMap can be turned off by instantiating the |
| // register map as: RegisterMap map(thread, false); |
| |
| class RegisterMap : public StackObj { |
| public: |
| typedef julong LocationValidType; |
| enum { |
| reg_count = ConcreteRegisterImpl::number_of_registers, |
| location_valid_type_size = sizeof(LocationValidType)*8, |
| location_valid_size = (reg_count+location_valid_type_size-1)/location_valid_type_size |
| }; |
| private: |
| intptr_t* _location[reg_count]; // Location of registers (intptr_t* looks better than address in the debugger) |
| LocationValidType _location_valid[location_valid_size]; |
| bool _include_argument_oops; // Should include argument_oop marked locations for compiler |
| JavaThread* _thread; // Reference to current thread |
| bool _update_map; // Tells if the register map need to be |
| // updated when traversing the stack |
| |
| #ifdef ASSERT |
| void check_location_valid(); |
| #else |
| void check_location_valid() {} |
| #endif |
| |
| public: |
| debug_only(intptr_t* _update_for_id;) // Assert that RegisterMap is not updated twice for same frame |
| RegisterMap(JavaThread *thread, bool update_map = true); |
| RegisterMap(const RegisterMap* map); |
| |
| address location(VMReg reg) const { |
| int index = reg->value() / location_valid_type_size; |
| assert(0 <= reg->value() && reg->value() < reg_count, "range check"); |
| assert(0 <= index && index < location_valid_size, "range check"); |
| if (_location_valid[index] & ((LocationValidType)1 << (reg->value() % location_valid_type_size))) { |
| return (address) _location[reg->value()]; |
| } else { |
| return pd_location(reg); |
| } |
| } |
| |
| void set_location(VMReg reg, address loc) { |
| int index = reg->value() / location_valid_type_size; |
| assert(0 <= reg->value() && reg->value() < reg_count, "range check"); |
| assert(0 <= index && index < location_valid_size, "range check"); |
| assert(_update_map, "updating map that does not need updating"); |
| _location[reg->value()] = (intptr_t*) loc; |
| _location_valid[index] |= ((LocationValidType)1 << (reg->value() % location_valid_type_size)); |
| check_location_valid(); |
| } |
| |
| // Called by an entry frame. |
| void clear(); |
| |
| bool include_argument_oops() const { return _include_argument_oops; } |
| void set_include_argument_oops(bool f) { _include_argument_oops = f; } |
| |
| JavaThread *thread() const { return _thread; } |
| bool update_map() const { return _update_map; } |
| |
| void print_on(outputStream* st) const; |
| void print() const; |
| |
| // the following contains the definition of pd_xxx methods |
| #include CPU_HEADER(registerMap) |
| |
| }; |
| |
| #endif // SHARE_VM_RUNTIME_REGISTERMAP_HPP |