hotspot/src/share/vm/compiler/methodMatcher.hpp

/*
 * Copyright (c) 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.
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 */

#ifndef SHARE_VM_COMPILER_METHODMATCHER_HPP
#define SHARE_VM_COMPILER_METHODMATCHER_HPP

#include "memory/allocation.inline.hpp"
#include "runtime/handles.inline.hpp"
#include "memory/resourceArea.hpp"

class MethodMatcher : public CHeapObj<mtCompiler> {
 public:
  enum Mode {
    Exact,
    Prefix = 1,
    Suffix = 2,
    Substring = Prefix | Suffix,
    Any,
    Unknown = -1
  };

 protected:
  Symbol*        _class_name;
  Symbol*        _method_name;
  Symbol*        _signature;
  Mode           _class_mode;
  Mode           _method_mode;

 public:
  Symbol* class_name() const { return _class_name; }
  Mode class_mode() const { return _class_mode; }
  Symbol* method_name() const { return _method_name; }
  Mode method_mode() const { return _method_mode; }
  Symbol* signature() const { return _signature; }

  MethodMatcher();
  ~MethodMatcher();

  void init(Symbol* class_name, Mode class_mode, Symbol* method_name, Mode method_mode, Symbol* signature);
  static void parse_method_pattern(char*& line, const char*& error_msg, MethodMatcher* m);
  static void print_symbol(outputStream* st, Symbol* h, Mode mode);
  bool matches(methodHandle method) const;
  void print_base(outputStream* st);

 private:
  static bool canonicalize(char * line, const char *& error_msg);
  bool match(Symbol* candidate, Symbol* match, Mode match_mode) const;
};

class BasicMatcher : public MethodMatcher {
private:
  BasicMatcher* _next;
public:

  BasicMatcher() : MethodMatcher(),
    _next(NULL) {
  }

  BasicMatcher(BasicMatcher* next) :
    _next(next) {
  }

  static BasicMatcher* parse_method_pattern(char* line, const char*& error_msg) {
    assert(error_msg == NULL, "Dont call here with error_msg already set");
    BasicMatcher* bm = new BasicMatcher();
    MethodMatcher::parse_method_pattern(line, error_msg, bm);
    if (error_msg != NULL) {
      delete bm;
      return NULL;
    }

    // check for bad trailing characters
    int bytes_read = 0;
    sscanf(line, "%*[ \t]%n", &bytes_read);
    if (line[bytes_read] != '\0') {
      error_msg = "Unrecognized trailing text after method pattern";
      delete bm;
      return NULL;
    }
    return bm;
  }

  bool match(methodHandle method) {
    for (BasicMatcher* current = this; current != NULL; current = current->next()) {
      if (current->matches(method)) {
        return true;
      }
    }
    return false;
  }

  void set_next(BasicMatcher* next) { _next = next; }
  BasicMatcher* next() { return _next; }

  void print(outputStream* st) { print_base(st); }
  void print_all(outputStream* st) {
    print_base(st);
    if (_next != NULL) {
      _next->print_all(st);
    }
  }
};

#endif // SHARE_VM_COMPILER_METHODMATCHER_HPP