1 /*
2 * Copyright (c) 2003, 2017, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2014, Red Hat Inc. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 #include "precompiled.hpp"
27 #include "interpreter/interpreter.hpp"
28 #include "oops/constMethod.hpp"
29 #include "oops/method.hpp"
30 #include "runtime/frame.inline.hpp"
31 #include "utilities/debug.hpp"
32 #include "utilities/macros.hpp"
33
34
35 int AbstractInterpreter::BasicType_as_index(BasicType type) {
36 int i = 0;
37 switch (type) {
38 case T_BOOLEAN: i = 0; break;
39 case T_CHAR : i = 1; break;
40 case T_BYTE : i = 2; break;
41 case T_SHORT : i = 3; break;
42 case T_INT : i = 4; break;
43 case T_LONG : i = 5; break;
44 case T_VOID : i = 6; break;
45 case T_FLOAT : i = 7; break;
46 case T_DOUBLE : i = 8; break;
47 case T_OBJECT : i = 9; break;
48 case T_ARRAY : i = 9; break;
49 default : ShouldNotReachHere();
50 }
51 assert(0 <= i && i < AbstractInterpreter::number_of_result_handlers,
52 "index out of bounds");
53 return i;
54 }
55
56 // How much stack a method activation needs in words.
57 int AbstractInterpreter::size_top_interpreter_activation(Method* method) {
58 const int entry_size = frame::interpreter_frame_monitor_size();
59
60 // total overhead size: entry_size + (saved rfp thru expr stack
61 // bottom). be sure to change this if you add/subtract anything
62 // to/from the overhead area
63 const int overhead_size =
64 -(frame::interpreter_frame_initial_sp_offset) + entry_size;
65
66 const int stub_code = frame::entry_frame_after_call_words;
67 const int method_stack = (method->max_locals() + method->max_stack()) *
68 Interpreter::stackElementWords;
69 return (overhead_size + method_stack + stub_code);
70 }
71
72 // asm based interpreter deoptimization helpers
73 int AbstractInterpreter::size_activation(int max_stack,
74 int temps,
75 int extra_args,
76 int monitors,
77 int callee_params,
78 int callee_locals,
79 bool is_top_frame) {
80 // Note: This calculation must exactly parallel the frame setup
81 // in TemplateInterpreterGenerator::generate_method_entry.
82
83 // fixed size of an interpreter frame:
84 int overhead = frame::sender_sp_offset -
85 frame::interpreter_frame_initial_sp_offset;
86 // Our locals were accounted for by the caller (or last_frame_adjust
87 // on the transistion) Since the callee parameters already account
88 // for the callee's params we only need to account for the extra
89 // locals.
90 int size = overhead +
91 (callee_locals - callee_params) +
92 monitors * frame::interpreter_frame_monitor_size() +
93 // On the top frame, at all times SP <= ESP, and SP is
94 // 16-aligned. We ensure this by adjusting SP on method
95 // entry and re-entry to allow room for the maximum size of
96 // the expression stack. When we call another method we bump
97 // SP so that no stack space is wasted. So, only on the top
98 // frame do we need to allow max_stack words.
99 (is_top_frame ? max_stack : temps + extra_args);
100
101 // On AArch64 we always keep the stack pointer 16-aligned, so we
102 // must round up here.
103 size = round_to(size, 2);
104
105 return size;
106 }
107
108 void AbstractInterpreter::layout_activation(Method* method,
109 int tempcount,
110 int popframe_extra_args,
111 int moncount,
112 int caller_actual_parameters,
113 int callee_param_count,
114 int callee_locals,
115 frame* caller,
116 frame* interpreter_frame,
117 bool is_top_frame,
118 bool is_bottom_frame) {
119 // The frame interpreter_frame is guaranteed to be the right size,
120 // as determined by a previous call to the size_activation() method.
121 // It is also guaranteed to be walkable even though it is in a
122 // skeletal state
123
124 int max_locals = method->max_locals() * Interpreter::stackElementWords;
125 int extra_locals = (method->max_locals() - method->size_of_parameters()) *
126 Interpreter::stackElementWords;
127
128 #ifdef ASSERT
129 assert(caller->sp() == interpreter_frame->sender_sp(), "Frame not properly walkable");
130 #endif
131
132 interpreter_frame->interpreter_frame_set_method(method);
133 // NOTE the difference in using sender_sp and
134 // interpreter_frame_sender_sp interpreter_frame_sender_sp is
135 // the original sp of the caller (the unextended_sp) and
136 // sender_sp is fp+8/16 (32bit/64bit) XXX
137 intptr_t* locals = interpreter_frame->sender_sp() + max_locals - 1;
138
139 #ifdef ASSERT
140 if (caller->is_interpreted_frame()) {
141 assert(locals < caller->fp() + frame::interpreter_frame_initial_sp_offset, "bad placement");
142 }
143 #endif
144
145 interpreter_frame->interpreter_frame_set_locals(locals);
146 BasicObjectLock* montop = interpreter_frame->interpreter_frame_monitor_begin();
147 BasicObjectLock* monbot = montop - moncount;
148 interpreter_frame->interpreter_frame_set_monitor_end(monbot);
149
150 // Set last_sp
151 intptr_t* esp = (intptr_t*) monbot -
152 tempcount*Interpreter::stackElementWords -
153 popframe_extra_args;
154 interpreter_frame->interpreter_frame_set_last_sp(esp);
155
156 // All frames but the initial (oldest) interpreter frame we fill in have
157 // a value for sender_sp that allows walking the stack but isn't
158 // truly correct. Correct the value here.
159 if (extra_locals != 0 &&
160 interpreter_frame->sender_sp() ==
161 interpreter_frame->interpreter_frame_sender_sp()) {
162 interpreter_frame->set_interpreter_frame_sender_sp(caller->sp() +
163 extra_locals);
164 }
165 *interpreter_frame->interpreter_frame_cache_addr() =
166 method->constants()->cache();
167 *interpreter_frame->interpreter_frame_mirror_addr() =
168 method->method_holder()->java_mirror();
169 }