Thu, 24 Mar 2011 02:11:50 -0700
7030207: Zero tweak to remove accidentally incorporated code
Summary: IcedTea contains a now-unmaintained ARM-specific interpreter and part of that interpreter was accidentally incorporated in one of the webrevs when Zero was initially imported.
Reviewed-by: twisti
Contributed-by: Gary Benson <gbenson@redhat.com>
1 /*
2 * Copyright (c) 1997, 2011, 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
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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
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23 */
25 #ifndef SHARE_VM_INTERPRETER_BYTECODESTREAM_HPP
26 #define SHARE_VM_INTERPRETER_BYTECODESTREAM_HPP
28 #include "interpreter/bytecode.hpp"
29 #include "memory/allocation.hpp"
30 #include "oops/methodOop.hpp"
31 #ifdef TARGET_ARCH_x86
32 # include "bytes_x86.hpp"
33 #endif
34 #ifdef TARGET_ARCH_sparc
35 # include "bytes_sparc.hpp"
36 #endif
37 #ifdef TARGET_ARCH_zero
38 # include "bytes_zero.hpp"
39 #endif
40 #ifdef TARGET_ARCH_arm
41 # include "bytes_arm.hpp"
42 #endif
43 #ifdef TARGET_ARCH_ppc
44 # include "bytes_ppc.hpp"
45 #endif
47 // A BytecodeStream is used for fast iteration over the bytecodes
48 // of a methodOop.
49 //
50 // Usage:
51 //
52 // BytecodeStream s(method);
53 // Bytecodes::Code c;
54 // while ((c = s.next()) >= 0) {
55 // ...
56 // }
58 // A RawBytecodeStream is a simple version of BytecodeStream.
59 // It is used ONLY when we know the bytecodes haven't been rewritten
60 // yet, such as in the rewriter or the verifier.
62 // Here is the common base class for both RawBytecodeStream and BytecodeStream:
63 class BaseBytecodeStream: StackObj {
64 protected:
65 // stream buffer
66 methodHandle _method; // read from method directly
68 // reading position
69 int _bci; // bci if current bytecode
70 int _next_bci; // bci of next bytecode
71 int _end_bci; // bci after the current iteration interval
73 // last bytecode read
74 Bytecodes::Code _raw_code;
75 bool _is_wide;
76 bool _is_raw; // false in 'cooked' BytecodeStream
78 // Construction
79 BaseBytecodeStream(methodHandle method) : _method(method) {
80 set_interval(0, _method->code_size());
81 _is_raw = false;
82 }
84 public:
85 // Iteration control
86 void set_interval(int beg_bci, int end_bci) {
87 // iterate over the interval [beg_bci, end_bci)
88 assert(0 <= beg_bci && beg_bci <= method()->code_size(), "illegal beg_bci");
89 assert(0 <= end_bci && end_bci <= method()->code_size(), "illegal end_bci");
90 // setup of iteration pointers
91 _bci = beg_bci;
92 _next_bci = beg_bci;
93 _end_bci = end_bci;
94 }
95 void set_start (int beg_bci) {
96 set_interval(beg_bci, _method->code_size());
97 }
99 bool is_raw() const { return _is_raw; }
101 // Stream attributes
102 methodHandle method() const { return _method; }
104 int bci() const { return _bci; }
105 int next_bci() const { return _next_bci; }
106 int end_bci() const { return _end_bci; }
108 Bytecodes::Code raw_code() const { return _raw_code; }
109 bool is_wide() const { return _is_wide; }
110 int instruction_size() const { return (_next_bci - _bci); }
111 bool is_last_bytecode() const { return _next_bci >= _end_bci; }
113 address bcp() const { return method()->code_base() + _bci; }
114 Bytecode bytecode() const { return Bytecode(_method(), bcp()); }
116 // State changes
117 void set_next_bci(int bci) { assert(0 <= bci && bci <= method()->code_size(), "illegal bci"); _next_bci = bci; }
119 // Bytecode-specific attributes
120 int dest() const { return bci() + bytecode().get_offset_s2(raw_code()); }
121 int dest_w() const { return bci() + bytecode().get_offset_s4(raw_code()); }
123 // One-byte indices.
124 int get_index_u1() const { assert_raw_index_size(1); return *(jubyte*)(bcp()+1); }
126 protected:
127 void assert_raw_index_size(int size) const NOT_DEBUG_RETURN;
128 void assert_raw_stream(bool want_raw) const NOT_DEBUG_RETURN;
129 };
131 class RawBytecodeStream: public BaseBytecodeStream {
132 public:
133 // Construction
134 RawBytecodeStream(methodHandle method) : BaseBytecodeStream(method) {
135 _is_raw = true;
136 }
138 public:
139 // Iteration
140 // Use raw_next() rather than next() for faster method reference
141 Bytecodes::Code raw_next() {
142 Bytecodes::Code code;
143 // set reading position
144 _bci = _next_bci;
145 assert(!is_last_bytecode(), "caller should check is_last_bytecode()");
147 address bcp = this->bcp();
148 code = Bytecodes::code_or_bp_at(bcp);
150 // set next bytecode position
151 int l = Bytecodes::length_for(code);
152 if (l > 0 && (_bci + l) <= _end_bci) {
153 assert(code != Bytecodes::_wide && code != Bytecodes::_tableswitch
154 && code != Bytecodes::_lookupswitch, "can't be special bytecode");
155 _is_wide = false;
156 _next_bci += l;
157 _raw_code = code;
158 return code;
159 } else {
160 return raw_next_special(code);
161 }
162 }
163 Bytecodes::Code raw_next_special(Bytecodes::Code code);
165 // Unsigned indices, widening, with no swapping of bytes
166 int get_index() const { return (is_wide()) ? get_index_u2_raw(bcp() + 2) : get_index_u1(); }
167 // Get an unsigned 2-byte index, with no swapping of bytes.
168 int get_index_u2() const { assert(!is_wide(), ""); return get_index_u2_raw(bcp() + 1); }
170 private:
171 int get_index_u2_raw(address p) const {
172 assert_raw_index_size(2); assert_raw_stream(true);
173 return Bytes::get_Java_u2(p);
174 }
175 };
177 // In BytecodeStream, non-java bytecodes will be translated into the
178 // corresponding java bytecodes.
180 class BytecodeStream: public BaseBytecodeStream {
181 Bytecodes::Code _code;
183 public:
184 // Construction
185 BytecodeStream(methodHandle method) : BaseBytecodeStream(method) { }
187 // Iteration
188 Bytecodes::Code next() {
189 Bytecodes::Code raw_code, code;
190 // set reading position
191 _bci = _next_bci;
192 if (is_last_bytecode()) {
193 // indicate end of bytecode stream
194 raw_code = code = Bytecodes::_illegal;
195 } else {
196 // get bytecode
197 address bcp = this->bcp();
198 raw_code = Bytecodes::code_at(_method(), bcp);
199 code = Bytecodes::java_code(raw_code);
200 // set next bytecode position
201 //
202 // note that we cannot advance before having the
203 // tty bytecode otherwise the stepping is wrong!
204 // (carefull: length_for(...) must be used first!)
205 int l = Bytecodes::length_for(code);
206 if (l == 0) l = Bytecodes::length_at(_method(), bcp);
207 _next_bci += l;
208 assert(_bci < _next_bci, "length must be > 0");
209 // set attributes
210 _is_wide = false;
211 // check for special (uncommon) cases
212 if (code == Bytecodes::_wide) {
213 raw_code = (Bytecodes::Code)bcp[1];
214 code = raw_code; // wide BCs are always Java-normal
215 _is_wide = true;
216 }
217 assert(Bytecodes::is_java_code(code), "sanity check");
218 }
219 _raw_code = raw_code;
220 _code = code;
221 return _code;
222 }
224 bool is_active_breakpoint() const { return Bytecodes::is_active_breakpoint_at(bcp()); }
225 Bytecodes::Code code() const { return _code; }
227 // Unsigned indices, widening
228 int get_index() const { return is_wide() ? bytecode().get_index_u2(raw_code(), true) : get_index_u1(); }
229 // Get an unsigned 2-byte index, swapping the bytes if necessary.
230 int get_index_u2() const { assert_raw_stream(false);
231 return bytecode().get_index_u2(raw_code(), false); }
232 // Get an unsigned 2-byte index in native order.
233 int get_index_u2_cpcache() const { assert_raw_stream(false);
234 return bytecode().get_index_u2_cpcache(raw_code()); }
235 int get_index_u4() const { assert_raw_stream(false);
236 return bytecode().get_index_u4(raw_code()); }
237 bool has_index_u4() const { return bytecode().has_index_u4(raw_code()); }
238 };
240 #endif // SHARE_VM_INTERPRETER_BYTECODESTREAM_HPP