132 lines
4.9 KiB
C++
132 lines
4.9 KiB
C++
/*
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* Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#ifndef SHARE_RUNTIME_STUBCODEGENERATOR_HPP
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#define SHARE_RUNTIME_STUBCODEGENERATOR_HPP
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#include "asm/assembler.hpp"
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#include "memory/allocation.hpp"
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// All the basic framework for stub code generation/debugging/printing.
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// A StubCodeDesc describes a piece of generated code (usually stubs).
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// This information is mainly useful for debugging and printing.
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// Currently, code descriptors are simply chained in a linked list,
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// this may have to change if searching becomes too slow.
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class StubCodeDesc: public CHeapObj<mtCode> {
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private:
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static StubCodeDesc* _list; // the list of all descriptors
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static bool _frozen; // determines whether _list modifications are allowed
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StubCodeDesc* _next; // the next element in the linked list
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const char* _group; // the group to which the stub code belongs
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const char* _name; // the name assigned to the stub code
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address _begin; // points to the first byte of the stub code (included)
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address _end; // points to the first byte after the stub code (excluded)
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void set_end(address end) {
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assert(_begin <= end, "begin & end not properly ordered");
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_end = end;
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}
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void set_begin(address begin) {
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assert(begin >= _begin, "begin may not decrease");
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assert(_end == NULL || begin <= _end, "begin & end not properly ordered");
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_begin = begin;
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}
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friend class StubCodeMark;
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friend class StubCodeGenerator;
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public:
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static StubCodeDesc* first() { return _list; }
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static StubCodeDesc* next(StubCodeDesc* desc) { return desc->_next; }
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static StubCodeDesc* desc_for(address pc); // returns the code descriptor for the code containing pc or NULL
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static const char* name_for(address pc); // returns the name of the code containing pc or NULL
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StubCodeDesc(const char* group, const char* name, address begin, address end = NULL) {
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assert(!_frozen, "no modifications allowed");
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assert(name != NULL, "no name specified");
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_next = _list;
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_group = group;
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_name = name;
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_begin = begin;
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_end = end;
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_list = this;
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};
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static void freeze();
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const char* group() const { return _group; }
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const char* name() const { return _name; }
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address begin() const { return _begin; }
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address end() const { return _end; }
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int size_in_bytes() const { return _end - _begin; }
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bool contains(address pc) const { return _begin <= pc && pc < _end; }
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void print_on(outputStream* st) const;
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void print() const;
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};
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// The base class for all stub-generating code generators.
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// Provides utility functions.
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class StubCodeGenerator: public StackObj {
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private:
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bool _print_code;
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protected:
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MacroAssembler* _masm;
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public:
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StubCodeGenerator(CodeBuffer* code, bool print_code = false);
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~StubCodeGenerator();
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MacroAssembler* assembler() const { return _masm; }
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virtual void stub_prolog(StubCodeDesc* cdesc); // called by StubCodeMark constructor
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virtual void stub_epilog(StubCodeDesc* cdesc); // called by StubCodeMark destructor
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};
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// Stack-allocated helper class used to associate a stub code with a name.
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// All stub code generating functions that use a StubCodeMark will be registered
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// in the global StubCodeDesc list and the generated stub code can be identified
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// later via an address pointing into it.
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class StubCodeMark: public StackObj {
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private:
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StubCodeGenerator* _cgen;
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StubCodeDesc* _cdesc;
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public:
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StubCodeMark(StubCodeGenerator* cgen, const char* group, const char* name);
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~StubCodeMark();
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};
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#endif // SHARE_RUNTIME_STUBCODEGENERATOR_HPP
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