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hotspot/src/share/vm/runtime/relocator.hpp

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+/*
+ * Copyright 1997-2004 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+// This code has been converted from the 1.1E java virtual machine
+// Thanks to the JavaTopics group for using the code
+
+class ChangeItem;
+
+// Callback object for code relocations
+class RelocatorListener : public StackObj {
+ public:
+  RelocatorListener() {};
+  virtual void relocated(int bci, int delta, int new_method_size) = 0;
+};
+
+
+class Relocator : public ResourceObj {
+ public:
+  Relocator(methodHandle method, RelocatorListener* listener);
+  methodHandle insert_space_at(int bci, int space, u_char inst_buffer[], TRAPS);
+
+  // Callbacks from ChangeItem's
+  bool handle_code_changes();
+  bool handle_widen       (int bci, int new_ilen, u_char inst_buffer[]);  // handles general instructions
+  void push_jump_widen  (int bci, int delta, int new_delta);    // pushes jumps
+  bool handle_jump_widen  (int bci, int delta);     // handles jumps
+  bool handle_switch_pad  (int bci, int old_pad, bool is_lookup_switch); // handles table and lookup switches
+
+ private:
+  unsigned char* _code_array;
+  int            _code_array_length;
+  int            _code_length;
+  unsigned char* _compressed_line_number_table;
+  int            _compressed_line_number_table_size;
+  methodHandle   _method;
+  u_char         _overwrite[3];             // stores overwritten bytes for shrunken instructions
+
+  GrowableArray<ChangeItem*>* _changes;
+
+  unsigned char* code_array() const         { return _code_array; }
+  void set_code_array(unsigned char* array) { _code_array = array; }
+
+  int code_length() const                   { return _code_length; }
+  void set_code_length(int length)          { _code_length = length; }
+
+  int code_array_length() const             { return _code_array_length; }
+  void set_code_array_length(int length)    { _code_array_length = length; }
+
+  unsigned char* compressed_line_number_table() const         { return _compressed_line_number_table; }
+  void set_compressed_line_number_table(unsigned char* table) { _compressed_line_number_table = table; }
+
+  int compressed_line_number_table_size() const               { return _compressed_line_number_table_size; }
+  void set_compressed_line_number_table_size(int size)        { _compressed_line_number_table_size = size; }
+
+  methodHandle method() const               { return _method; }
+  void set_method(methodHandle method)      { _method = method; }
+
+  // This will return a raw bytecode, which is possibly rewritten.
+  Bytecodes::Code code_at(int bci) const          { return (Bytecodes::Code) code_array()[bci]; }
+  void code_at_put(int bci, Bytecodes::Code code) { code_array()[bci] = (char) code; }
+
+  // get and set signed integers in the code_array
+  inline int   int_at(int bci) const               { return Bytes::get_Java_u4(&code_array()[bci]); }
+  inline void  int_at_put(int bci, int value)      { Bytes::put_Java_u4(&code_array()[bci], value); }
+
+  // get and set signed shorts in the code_array
+  inline short short_at(int bci) const            { return (short)Bytes::get_Java_u2(&code_array()[bci]); }
+  inline void  short_at_put(int bci, short value) { Bytes::put_Java_u2((address) &code_array()[bci], value); }
+
+  // get the address of in the code_array
+  inline char* addr_at(int bci) const             { return (char*) &code_array()[bci]; }
+
+  int  instruction_length_at(int bci)             { return Bytecodes::length_at(code_array() + bci); }
+
+  // Helper methods
+  int  align(int n) const                          { return (n+3) & ~3; }
+  int  code_slop_pct() const                       { return 25; }
+  bool is_opcode_lookupswitch(Bytecodes::Code bc);
+
+  // basic relocation methods
+  bool relocate_code         (int bci, int ilen, int delta);
+  void change_jumps          (int break_bci, int delta);
+  void change_jump           (int bci, int offset, bool is_short, int break_bci, int delta);
+  void adjust_exception_table(int bci, int delta);
+  void adjust_line_no_table  (int bci, int delta);
+  void adjust_local_var_table(int bci, int delta);
+  int  get_orig_switch_pad   (int bci, bool is_lookup_switch);
+  int  rc_instr_len          (int bci);
+  bool expand_code_array     (int delta);
+
+  // Callback support
+  RelocatorListener *_listener;
+  void notify(int bci, int delta, int new_code_length) {
+    if (_listener != NULL)
+      _listener->relocated(bci, delta, new_code_length);
+  }
+};