1 /*
  2  * Copyright (c) 1997, 2017, 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.
 22  *
 23  */
 24 
 25 #include "precompiled.hpp"
 26 #include "ci/ciMethod.hpp"
 27 #include "interpreter/interpreter.hpp"
 28 #include "oops/klass.inline.hpp"
 29 #include "runtime/frame.inline.hpp"
 30 
 31 
 32 // asm based interpreter deoptimization helpers
 33 int AbstractInterpreter::size_activation(int max_stack,
 34                                          int temps,
 35                                          int extra_args,
 36                                          int monitors,
 37                                          int callee_params,
 38                                          int callee_locals,
 39                                          bool is_top_frame) {
 40   // Note: This calculation must exactly parallel the frame setup
 41   // in TemplateInterpreterGenerator::generate_fixed_frame.
 42 
 43   // fixed size of an interpreter frame:
 44   int overhead = frame::sender_sp_offset -
 45                  frame::interpreter_frame_initial_sp_offset;
 46   // Our locals were accounted for by the caller (or last_frame_adjust
 47   // on the transistion) Since the callee parameters already account
 48   // for the callee's params we only need to account for the extra
 49   // locals.
 50   int size = overhead +
 51          (callee_locals - callee_params)*Interpreter::stackElementWords +
 52          monitors * frame::interpreter_frame_monitor_size() +
 53          temps* Interpreter::stackElementWords + extra_args;
 54 
 55   return size;
 56 }
 57 
 58 void AbstractInterpreter::layout_activation(Method* method,
 59                                             int tempcount,
 60                                             int popframe_extra_args,
 61                                             int moncount,
 62                                             int caller_actual_parameters,
 63                                             int callee_param_count,
 64                                             int callee_locals,
 65                                             frame* caller,
 66                                             frame* interpreter_frame,
 67                                             bool is_top_frame,
 68                                             bool is_bottom_frame) {
 69   // The frame interpreter_frame is guaranteed to be the right size,
 70   // as determined by a previous call to the size_activation() method.
 71   // It is also guaranteed to be walkable even though it is in a
 72   // skeletal state
 73 
 74   const int max_locals = method->max_locals() * Interpreter::stackElementWords;
 75   const int params = method->size_of_parameters() * Interpreter::stackElementWords;
 76   const int extra_locals = max_locals - params;
 77 
 78   assert(caller->sp() == interpreter_frame->sender_sp(), "Frame not properly walkable");
 79 
 80   interpreter_frame->interpreter_frame_set_method(method);
 81   // NOTE the difference in using sender_sp and
 82   // interpreter_frame_sender_sp interpreter_frame_sender_sp is
 83   // the original sp of the caller (the unextended_sp) and
 84   // sender_sp is fp+8/16 (32bit/64bit) XXX
 85   intptr_t* const locals = interpreter_frame->sender_sp() + max_locals - 1;
 86 
 87 #ifdef ASSERT
 88   if (caller->is_interpreted_frame()) {
 89     if (locals >= caller->fp() + frame::interpreter_frame_initial_sp_offset) {
 90       tty->print("method: "); method->print_on(tty);
 91       tty->print("caller: "); caller->print_on(tty);
 92       tty->print_cr("sender_sp: " INTPTR_FORMAT " locals: " INTPTR_FORMAT " max_locals: %d caller.fp: " INTPTR_FORMAT " caller.initial_sp: " INTPTR_FORMAT, p2i(interpreter_frame->sender_sp()), p2i(locals), max_locals, p2i(caller->fp()), p2i(caller->fp() + frame::interpreter_frame_initial_sp_offset));
 93     }
 94     assert(locals < caller->fp() + frame::interpreter_frame_initial_sp_offset, "bad placement");
 95   }
 96 #endif
 97 
 98   interpreter_frame->interpreter_frame_set_locals(locals);
 99   BasicObjectLock* montop = interpreter_frame->interpreter_frame_monitor_begin();
100   BasicObjectLock* monbot = montop - moncount;
101   interpreter_frame->interpreter_frame_set_monitor_end(monbot);
102 
103   // Set last_sp
104   intptr_t*  esp = (intptr_t*) monbot -
105     tempcount*Interpreter::stackElementWords -
106     popframe_extra_args;
107   interpreter_frame->interpreter_frame_set_last_sp(esp);
108 
109   // All frames but the initial (oldest) interpreter frame we fill in have
110   // a value for sender_sp that allows walking the stack but isn't
111   // truly correct. Correct the value here.
112   if (extra_locals != 0 && interpreter_frame->sender_sp() == interpreter_frame->interpreter_frame_sender_sp()) {
113     interpreter_frame->set_interpreter_frame_sender_sp(caller->sp() + extra_locals);
114   }
115 
116   *interpreter_frame->interpreter_frame_cache_addr()  = method->constants()->cache();
117   *interpreter_frame->interpreter_frame_mirror_addr() = method->method_holder()->java_mirror();
118 }
119 
120 #ifndef _LP64
121 int AbstractInterpreter::BasicType_as_index(BasicType type) {
122   int i = 0;
123   switch (type) {
124     case T_BOOLEAN: i = 0; break;
125     case T_CHAR   : i = 1; break;
126     case T_BYTE   : i = 2; break;
127     case T_SHORT  : i = 3; break;
128     case T_INT    : // fall through
129     case T_LONG   : // fall through
130     case T_VOID   : i = 4; break;
131     case T_FLOAT  : i = 5; break;  // have to treat float and double separately for SSE
132     case T_DOUBLE : i = 6; break;
133     case T_OBJECT : // fall through
134     case T_ARRAY  : i = 7; break;
135     default       : ShouldNotReachHere();
136   }
137   assert(0 <= i && i < AbstractInterpreter::number_of_result_handlers, "index out of bounds");
138   return i;
139 }
140 #else
141 int AbstractInterpreter::BasicType_as_index(BasicType type) {
142   int i = 0;
143   switch (type) {
144     case T_BOOLEAN: i = 0; break;
145     case T_CHAR   : i = 1; break;
146     case T_BYTE   : i = 2; break;
147     case T_SHORT  : i = 3; break;
148     case T_INT    : i = 4; break;
149     case T_LONG   : i = 5; break;
150     case T_VOID   : i = 6; break;
151     case T_FLOAT  : i = 7; break;
152     case T_DOUBLE : i = 8; break;
153     case T_OBJECT : i = 9; break;
154     case T_ARRAY  : i = 9; break;
155     default       : ShouldNotReachHere();
156   }
157   assert(0 <= i && i < AbstractInterpreter::number_of_result_handlers,
158          "index out of bounds");
159   return i;
160 }
161 #endif // _LP64
162 
163 // How much stack a method activation needs in words.
164 int AbstractInterpreter::size_top_interpreter_activation(Method* method) {
165   const int entry_size = frame::interpreter_frame_monitor_size();
166 
167   // total overhead size: entry_size + (saved rbp thru expr stack
168   // bottom).  be sure to change this if you add/subtract anything
169   // to/from the overhead area
170   const int overhead_size =
171     -(frame::interpreter_frame_initial_sp_offset) + entry_size;
172 
173 #ifndef _LP64
174   const int stub_code = 4;  // see generate_call_stub
175 #else
176   const int stub_code = frame::entry_frame_after_call_words;
177 #endif
178 
179   const int method_stack = (method->max_locals() + method->max_stack()) *
180                            Interpreter::stackElementWords;
181   return (overhead_size + method_stack + stub_code);
182 }