| /* |
| * Copyright (c) 1997, 2015, 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_STUBCODEGENERATOR_HPP |
| #define SHARE_VM_RUNTIME_STUBCODEGENERATOR_HPP |
| |
| #include "asm/assembler.hpp" |
| #include "memory/allocation.hpp" |
| |
| // All the basic framework for stub code generation/debugging/printing. |
| |
| |
| // A StubCodeDesc describes a piece of generated code (usually stubs). |
| // This information is mainly useful for debugging and printing. |
| // Currently, code descriptors are simply chained in a linked list, |
| // this may have to change if searching becomes too slow. |
| |
| class StubCodeDesc: public CHeapObj<mtCode> { |
| private: |
| static StubCodeDesc* _list; // the list of all descriptors |
| static bool _frozen; // determines whether _list modifications are allowed |
| |
| StubCodeDesc* _next; // the next element in the linked list |
| const char* _group; // the group to which the stub code belongs |
| const char* _name; // the name assigned to the stub code |
| address _begin; // points to the first byte of the stub code (included) |
| address _end; // points to the first byte after the stub code (excluded) |
| |
| void set_end(address end) { |
| assert(_begin <= end, "begin & end not properly ordered"); |
| _end = end; |
| } |
| |
| void set_begin(address begin) { |
| assert(begin >= _begin, "begin may not decrease"); |
| assert(_end == NULL || begin <= _end, "begin & end not properly ordered"); |
| _begin = begin; |
| } |
| |
| friend class StubCodeMark; |
| friend class StubCodeGenerator; |
| |
| public: |
| static StubCodeDesc* first() { return _list; } |
| static StubCodeDesc* next(StubCodeDesc* desc) { return desc->_next; } |
| |
| static StubCodeDesc* desc_for(address pc); // returns the code descriptor for the code containing pc or NULL |
| static const char* name_for(address pc); // returns the name of the code containing pc or NULL |
| |
| StubCodeDesc(const char* group, const char* name, address begin, address end = NULL) { |
| assert(!_frozen, "no modifications allowed"); |
| assert(name != NULL, "no name specified"); |
| _next = _list; |
| _group = group; |
| _name = name; |
| _begin = begin; |
| _end = end; |
| _list = this; |
| }; |
| |
| static void freeze(); |
| |
| const char* group() const { return _group; } |
| const char* name() const { return _name; } |
| address begin() const { return _begin; } |
| address end() const { return _end; } |
| int size_in_bytes() const { return _end - _begin; } |
| bool contains(address pc) const { return _begin <= pc && pc < _end; } |
| void print_on(outputStream* st) const; |
| void print() const { print_on(tty); } |
| }; |
| |
| // The base class for all stub-generating code generators. |
| // Provides utility functions. |
| |
| class StubCodeGenerator: public StackObj { |
| private: |
| bool _print_code; |
| |
| protected: |
| MacroAssembler* _masm; |
| |
| public: |
| StubCodeGenerator(CodeBuffer* code, bool print_code = false); |
| ~StubCodeGenerator(); |
| |
| MacroAssembler* assembler() const { return _masm; } |
| |
| virtual void stub_prolog(StubCodeDesc* cdesc); // called by StubCodeMark constructor |
| virtual void stub_epilog(StubCodeDesc* cdesc); // called by StubCodeMark destructor |
| }; |
| |
| |
| // Stack-allocated helper class used to associate a stub code with a name. |
| // All stub code generating functions that use a StubCodeMark will be registered |
| // in the global StubCodeDesc list and the generated stub code can be identified |
| // later via an address pointing into it. |
| |
| class StubCodeMark: public StackObj { |
| private: |
| StubCodeGenerator* _cgen; |
| StubCodeDesc* _cdesc; |
| |
| public: |
| StubCodeMark(StubCodeGenerator* cgen, const char* group, const char* name); |
| ~StubCodeMark(); |
| |
| }; |
| |
| #endif // SHARE_VM_RUNTIME_STUBCODEGENERATOR_HPP |