templateInterpreter.hpp revision 1472:c18cbe5936b8 
1/*
2 * Copyright (c) 1997, 2009, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
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23 */
24
25// This file contains the platform-independent parts
26// of the template interpreter and the template interpreter generator.
27
28#ifndef CC_INTERP
29
30//------------------------------------------------------------------------------------------------------------------------
31// A little wrapper class to group tosca-specific entry points into a unit.
32// (tosca = Top-Of-Stack CAche)
33
34class EntryPoint VALUE_OBJ_CLASS_SPEC {
35 private:
36  address _entry[number_of_states];
37
38 public:
39  // Construction
40  EntryPoint();
41  EntryPoint(address bentry, address centry, address sentry, address aentry, address ientry, address lentry, address fentry, address dentry, address ventry);
42
43  // Attributes
44  address entry(TosState state) const;                // return target address for a given tosca state
45  void    set_entry(TosState state, address entry);   // set    target address for a given tosca state
46  void    print();
47
48  // Comparison
49  bool operator == (const EntryPoint& y);             // for debugging only
50};
51
52
53//------------------------------------------------------------------------------------------------------------------------
54// A little wrapper class to group tosca-specific dispatch tables into a unit.
55
56class DispatchTable VALUE_OBJ_CLASS_SPEC {
57 public:
58  enum { length = 1 << BitsPerByte };                 // an entry point for each byte value (also for undefined bytecodes)
59
60 private:
61  address _table[number_of_states][length];           // dispatch tables, indexed by tosca and bytecode
62
63 public:
64  // Attributes
65  EntryPoint entry(int i) const;                      // return entry point for a given bytecode i
66  void       set_entry(int i, EntryPoint& entry);     // set    entry point for a given bytecode i
67  address*   table_for(TosState state)          { return _table[state]; }
68  address*   table_for()                        { return table_for((TosState)0); }
69  int        distance_from(address *table)      { return table - table_for(); }
70  int        distance_from(TosState state)      { return distance_from(table_for(state)); }
71
72  // Comparison
73  bool operator == (DispatchTable& y);                // for debugging only
74};
75
76class TemplateInterpreter: public AbstractInterpreter {
77  friend class VMStructs;
78  friend class InterpreterMacroAssembler;
79  friend class TemplateInterpreterGenerator;
80  friend class InterpreterGenerator;
81  friend class TemplateTable;
82  // friend class Interpreter;
83 public:
84
85  enum MoreConstants {
86    number_of_return_entries  = number_of_states,               // number of return entry points
87    number_of_deopt_entries   = number_of_states,               // number of deoptimization entry points
88    number_of_return_addrs    = number_of_states                // number of return addresses
89  };
90
91 protected:
92
93  static address    _throw_ArrayIndexOutOfBoundsException_entry;
94  static address    _throw_ArrayStoreException_entry;
95  static address    _throw_ArithmeticException_entry;
96  static address    _throw_ClassCastException_entry;
97  static address    _throw_WrongMethodType_entry;
98  static address    _throw_NullPointerException_entry;
99  static address    _throw_exception_entry;
100
101  static address    _throw_StackOverflowError_entry;
102
103  static address    _remove_activation_entry;                   // continuation address if an exception is not handled by current frame
104#ifdef HOTSWAP
105  static address    _remove_activation_preserving_args_entry;   // continuation address when current frame is being popped
106#endif // HOTSWAP
107
108#ifndef PRODUCT
109  static EntryPoint _trace_code;
110#endif // !PRODUCT
111  static EntryPoint _return_entry[number_of_return_entries];    // entry points to return to from a call
112  static EntryPoint _earlyret_entry;                            // entry point to return early from a call
113  static EntryPoint _deopt_entry[number_of_deopt_entries];      // entry points to return to from a deoptimization
114  static EntryPoint _continuation_entry;
115  static EntryPoint _safept_entry;
116
117  static address    _return_3_addrs_by_index[number_of_return_addrs];     // for invokevirtual   return entries
118  static address    _return_5_addrs_by_index[number_of_return_addrs];     // for invokeinterface return entries
119
120  static DispatchTable _active_table;                           // the active    dispatch table (used by the interpreter for dispatch)
121  static DispatchTable _normal_table;                           // the normal    dispatch table (used to set the active table in normal mode)
122  static DispatchTable _safept_table;                           // the safepoint dispatch table (used to set the active table for safepoints)
123  static address       _wentry_point[DispatchTable::length];    // wide instructions only (vtos tosca always)
124
125
126 public:
127  // Initialization/debugging
128  static void       initialize();
129  // this only returns whether a pc is within generated code for the interpreter.
130  static bool       contains(address pc)                        { return _code != NULL && _code->contains(pc); }
131
132 public:
133
134  static address    remove_activation_early_entry(TosState state) { return _earlyret_entry.entry(state); }
135#ifdef HOTSWAP
136  static address    remove_activation_preserving_args_entry()   { return _remove_activation_preserving_args_entry; }
137#endif // HOTSWAP
138
139  static address    remove_activation_entry()                   { return _remove_activation_entry; }
140  static address    throw_exception_entry()                     { return _throw_exception_entry; }
141  static address    throw_ArithmeticException_entry()           { return _throw_ArithmeticException_entry; }
142  static address    throw_WrongMethodType_entry()               { return _throw_WrongMethodType_entry; }
143  static address    throw_NullPointerException_entry()          { return _throw_NullPointerException_entry; }
144  static address    throw_StackOverflowError_entry()            { return _throw_StackOverflowError_entry; }
145
146  // Code generation
147#ifndef PRODUCT
148  static address    trace_code    (TosState state)              { return _trace_code.entry(state); }
149#endif // !PRODUCT
150  static address    continuation  (TosState state)              { return _continuation_entry.entry(state); }
151  static address*   dispatch_table(TosState state)              { return _active_table.table_for(state); }
152  static address*   dispatch_table()                            { return _active_table.table_for(); }
153  static int        distance_from_dispatch_table(TosState state){ return _active_table.distance_from(state); }
154  static address*   normal_table(TosState state)                { return _normal_table.table_for(state); }
155  static address*   normal_table()                              { return _normal_table.table_for(); }
156
157  // Support for invokes
158  static address*   return_3_addrs_by_index_table()             { return _return_3_addrs_by_index; }
159  static address*   return_5_addrs_by_index_table()             { return _return_5_addrs_by_index; }
160  static int        TosState_as_index(TosState state);          // computes index into return_3_entry_by_index table
161
162  static address    return_entry  (TosState state, int length);
163  static address    deopt_entry   (TosState state, int length);
164
165  // Safepoint support
166  static void       notice_safepoints();                        // stops the thread when reaching a safepoint
167  static void       ignore_safepoints();                        // ignores safepoints
168
169  // Deoptimization support
170  // Compute the entry address for continuation after
171  static address deopt_continue_after_entry(methodOop method,
172                                            address bcp,
173                                            int callee_parameters,
174                                            bool is_top_frame);
175  // Deoptimization should reexecute this bytecode
176  static bool    bytecode_should_reexecute(Bytecodes::Code code);
177  // Compute the address for reexecution
178  static address deopt_reexecute_entry(methodOop method, address bcp);
179
180#include "incls/_templateInterpreter_pd.hpp.incl"
181
182};
183
184#endif // !CC_INTERP
185