| author | jrose |
| Sun, 23 May 2010 01:38:26 -0700 | |
| changeset 5688 | 9052dc91ea67 |
| parent 3261 | c7d5aae8d3f7 |
| child 5693 | 3015c564fcbc |
| permissions | -rw-r--r-- |
| 1 | 1 |
/* |
| 5688 | 2 |
* Copyright 1997-2010 Sun Microsystems, Inc. All Rights Reserved. |
| 1 | 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
|
20 |
* CA 95054 USA or visit www.sun.com if you need additional information or |
|
21 |
* have any questions. |
|
22 |
* |
|
23 |
*/ |
|
24 |
||
25 |
// A BytecodeStream is used for fast iteration over the bytecodes |
|
26 |
// of a methodOop. |
|
27 |
// |
|
28 |
// Usage: |
|
29 |
// |
|
30 |
// BytecodeStream s(method); |
|
31 |
// Bytecodes::Code c; |
|
32 |
// while ((c = s.next()) >= 0) {
|
|
33 |
// ... |
|
34 |
// } |
|
| 5688 | 35 |
|
| 1 | 36 |
// A RawBytecodeStream is a simple version of BytecodeStream. |
37 |
// It is used ONLY when we know the bytecodes haven't been rewritten |
|
| 5688 | 38 |
// yet, such as in the rewriter or the verifier. |
| 1 | 39 |
|
| 5688 | 40 |
// Here is the common base class for both RawBytecodeStream and BytecodeStream: |
41 |
class BaseBytecodeStream: StackObj {
|
|
| 1 | 42 |
protected: |
43 |
// stream buffer |
|
44 |
methodHandle _method; // read from method directly |
|
45 |
||
46 |
// reading position |
|
47 |
int _bci; // bci if current bytecode |
|
48 |
int _next_bci; // bci of next bytecode |
|
49 |
int _end_bci; // bci after the current iteration interval |
|
50 |
||
51 |
// last bytecode read |
|
| 5688 | 52 |
Bytecodes::Code _raw_code; |
| 1 | 53 |
bool _is_wide; |
| 5688 | 54 |
bool _is_raw; // false in 'cooked' BytecodeStream |
55 |
||
56 |
// Construction |
|
57 |
BaseBytecodeStream(methodHandle method) : _method(method) {
|
|
58 |
set_interval(0, _method->code_size()); |
|
59 |
_is_raw = false; |
|
60 |
} |
|
| 1 | 61 |
|
62 |
public: |
|
63 |
// Iteration control |
|
64 |
void set_interval(int beg_bci, int end_bci) {
|
|
65 |
// iterate over the interval [beg_bci, end_bci) |
|
66 |
assert(0 <= beg_bci && beg_bci <= method()->code_size(), "illegal beg_bci"); |
|
67 |
assert(0 <= end_bci && end_bci <= method()->code_size(), "illegal end_bci"); |
|
68 |
// setup of iteration pointers |
|
69 |
_bci = beg_bci; |
|
70 |
_next_bci = beg_bci; |
|
71 |
_end_bci = end_bci; |
|
72 |
} |
|
73 |
void set_start (int beg_bci) {
|
|
74 |
set_interval(beg_bci, _method->code_size()); |
|
75 |
} |
|
76 |
||
| 5688 | 77 |
bool is_raw() const { return _is_raw; }
|
78 |
||
79 |
// Stream attributes |
|
80 |
methodHandle method() const { return _method; }
|
|
81 |
||
82 |
int bci() const { return _bci; }
|
|
83 |
int next_bci() const { return _next_bci; }
|
|
84 |
int end_bci() const { return _end_bci; }
|
|
85 |
||
86 |
Bytecodes::Code raw_code() const { return _raw_code; }
|
|
87 |
bool is_wide() const { return _is_wide; }
|
|
88 |
int instruction_size() const { return (_next_bci - _bci); }
|
|
89 |
bool is_last_bytecode() const { return _next_bci >= _end_bci; }
|
|
90 |
||
91 |
address bcp() const { return method()->code_base() + _bci; }
|
|
92 |
Bytecode* bytecode() const { return Bytecode_at(bcp()); }
|
|
93 |
||
94 |
// State changes |
|
95 |
void set_next_bci(int bci) { assert(0 <= bci && bci <= method()->code_size(), "illegal bci"); _next_bci = bci; }
|
|
96 |
||
97 |
// Bytecode-specific attributes |
|
98 |
int dest() const { return bci() + bytecode()->get_offset_s2(raw_code()); }
|
|
99 |
int dest_w() const { return bci() + bytecode()->get_offset_s4(raw_code()); }
|
|
100 |
||
101 |
// One-byte indices. |
|
102 |
int get_index_u1() const { assert_raw_index_size(1); return *(jubyte*)(bcp()+1); }
|
|
103 |
||
104 |
protected: |
|
105 |
void assert_raw_index_size(int size) const NOT_DEBUG_RETURN; |
|
106 |
void assert_raw_stream(bool want_raw) const NOT_DEBUG_RETURN; |
|
107 |
}; |
|
108 |
||
109 |
class RawBytecodeStream: public BaseBytecodeStream {
|
|
110 |
public: |
|
111 |
// Construction |
|
112 |
RawBytecodeStream(methodHandle method) : BaseBytecodeStream(method) {
|
|
113 |
_is_raw = true; |
|
114 |
} |
|
115 |
||
116 |
public: |
|
| 1 | 117 |
// Iteration |
118 |
// Use raw_next() rather than next() for faster method reference |
|
119 |
Bytecodes::Code raw_next() {
|
|
120 |
Bytecodes::Code code; |
|
121 |
// set reading position |
|
122 |
_bci = _next_bci; |
|
123 |
assert(!is_last_bytecode(), "caller should check is_last_bytecode()"); |
|
124 |
||
| 5688 | 125 |
address bcp = this->bcp(); |
| 1 | 126 |
code = Bytecodes::code_or_bp_at(bcp); |
127 |
||
128 |
// set next bytecode position |
|
129 |
int l = Bytecodes::length_for(code); |
|
130 |
if (l > 0 && (_bci + l) <= _end_bci) {
|
|
131 |
assert(code != Bytecodes::_wide && code != Bytecodes::_tableswitch |
|
132 |
&& code != Bytecodes::_lookupswitch, "can't be special bytecode"); |
|
133 |
_is_wide = false; |
|
134 |
_next_bci += l; |
|
| 5688 | 135 |
_raw_code = code; |
| 1 | 136 |
return code; |
137 |
} else {
|
|
138 |
return raw_next_special(code); |
|
139 |
} |
|
140 |
} |
|
141 |
Bytecodes::Code raw_next_special(Bytecodes::Code code); |
|
142 |
||
| 5688 | 143 |
// Unsigned indices, widening, with no swapping of bytes |
144 |
int get_index() const { return (is_wide()) ? get_index_u2_raw(bcp() + 2) : get_index_u1(); }
|
|
145 |
// Get an unsigned 2-byte index, with no swapping of bytes. |
|
146 |
int get_index_u2() const { assert(!is_wide(), ""); return get_index_u2_raw(bcp() + 1); }
|
|
|
2570
ecc7862946d4
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
1
diff
changeset
|
147 |
|
|
ecc7862946d4
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
1
diff
changeset
|
148 |
private: |
| 5688 | 149 |
int get_index_u2_raw(address p) const {
|
150 |
assert_raw_index_size(2); assert_raw_stream(true); |
|
151 |
return Bytes::get_Java_u2(p); |
|
|
2570
ecc7862946d4
6655646: dynamic languages need dynamically linked call sites
jrose
parents:
1
diff
changeset
|
152 |
} |
| 1 | 153 |
}; |
154 |
||
155 |
// In BytecodeStream, non-java bytecodes will be translated into the |
|
156 |
// corresponding java bytecodes. |
|
157 |
||
| 5688 | 158 |
class BytecodeStream: public BaseBytecodeStream {
|
159 |
Bytecodes::Code _code; |
|
160 |
||
| 1 | 161 |
public: |
162 |
// Construction |
|
| 5688 | 163 |
BytecodeStream(methodHandle method) : BaseBytecodeStream(method) { }
|
| 1 | 164 |
|
165 |
// Iteration |
|
166 |
Bytecodes::Code next() {
|
|
| 5688 | 167 |
Bytecodes::Code raw_code, code; |
| 1 | 168 |
// set reading position |
169 |
_bci = _next_bci; |
|
170 |
if (is_last_bytecode()) {
|
|
171 |
// indicate end of bytecode stream |
|
| 5688 | 172 |
raw_code = code = Bytecodes::_illegal; |
| 1 | 173 |
} else {
|
174 |
// get bytecode |
|
| 5688 | 175 |
address bcp = this->bcp(); |
176 |
raw_code = Bytecodes::code_at(bcp); |
|
177 |
code = Bytecodes::java_code(raw_code); |
|
| 1 | 178 |
// set next bytecode position |
179 |
// |
|
180 |
// note that we cannot advance before having the |
|
181 |
// tty bytecode otherwise the stepping is wrong! |
|
182 |
// (carefull: length_for(...) must be used first!) |
|
183 |
int l = Bytecodes::length_for(code); |
|
184 |
if (l == 0) l = Bytecodes::length_at(bcp); |
|
185 |
_next_bci += l; |
|
186 |
assert(_bci < _next_bci, "length must be > 0"); |
|
187 |
// set attributes |
|
188 |
_is_wide = false; |
|
189 |
// check for special (uncommon) cases |
|
190 |
if (code == Bytecodes::_wide) {
|
|
| 5688 | 191 |
raw_code = (Bytecodes::Code)bcp[1]; |
192 |
code = raw_code; // wide BCs are always Java-normal |
|
| 1 | 193 |
_is_wide = true; |
194 |
} |
|
195 |
assert(Bytecodes::is_java_code(code), "sanity check"); |
|
196 |
} |
|
| 5688 | 197 |
_raw_code = raw_code; |
| 1 | 198 |
_code = code; |
199 |
return _code; |
|
200 |
} |
|
201 |
||
202 |
bool is_active_breakpoint() const { return Bytecodes::is_active_breakpoint_at(bcp()); }
|
|
| 5688 | 203 |
Bytecodes::Code code() const { return _code; }
|
204 |
||
205 |
// Unsigned indices, widening |
|
206 |
int get_index() const { return is_wide() ? bytecode()->get_index_u2(raw_code(), true) : get_index_u1(); }
|
|
207 |
// Get an unsigned 2-byte index, swapping the bytes if necessary. |
|
208 |
int get_index_u2() const { assert_raw_stream(false);
|
|
209 |
return bytecode()->get_index_u2(raw_code(), false); } |
|
210 |
// Get an unsigned 2-byte index in native order. |
|
211 |
int get_index_u2_cpcache() const { assert_raw_stream(false);
|
|
212 |
return bytecode()->get_index_u2_cpcache(raw_code()); } |
|
213 |
int get_index_u4() const { assert_raw_stream(false);
|
|
214 |
return bytecode()->get_index_u4(raw_code()); } |
|
215 |
int has_index_u4() const { return bytecode()->get_index_u4(raw_code()); }
|
|
| 1 | 216 |
}; |