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 // 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 // }
35
36 // A RawBytecodeStream is a simple version of BytecodeStream.
37 // It is used ONLY when we know the bytecodes haven't been rewritten
38 // yet, such as in the rewriter or the verifier.
39
40 // Here is the common base class for both RawBytecodeStream and BytecodeStream:
41 class BaseBytecodeStream: StackObj {
42 protected:
43 // stream buffer
44 methodHandle _method; // read from method directly
197 _raw_code = raw_code;
198 _code = code;
199 return _code;
200 }
201
202 bool is_active_breakpoint() const { return Bytecodes::is_active_breakpoint_at(bcp()); }
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 bool has_index_u4() const { return bytecode()->has_index_u4(raw_code()); }
216 };
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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 #ifndef SHARE_VM_INTERPRETER_BYTECODESTREAM_HPP
26 #define SHARE_VM_INTERPRETER_BYTECODESTREAM_HPP
27
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
41 // A BytecodeStream is used for fast iteration over the bytecodes
42 // of a methodOop.
43 //
44 // Usage:
45 //
46 // BytecodeStream s(method);
47 // Bytecodes::Code c;
48 // while ((c = s.next()) >= 0) {
49 // ...
50 // }
51
52 // A RawBytecodeStream is a simple version of BytecodeStream.
53 // It is used ONLY when we know the bytecodes haven't been rewritten
54 // yet, such as in the rewriter or the verifier.
55
56 // Here is the common base class for both RawBytecodeStream and BytecodeStream:
57 class BaseBytecodeStream: StackObj {
58 protected:
59 // stream buffer
60 methodHandle _method; // read from method directly
213 _raw_code = raw_code;
214 _code = code;
215 return _code;
216 }
217
218 bool is_active_breakpoint() const { return Bytecodes::is_active_breakpoint_at(bcp()); }
219 Bytecodes::Code code() const { return _code; }
220
221 // Unsigned indices, widening
222 int get_index() const { return is_wide() ? bytecode()->get_index_u2(raw_code(), true) : get_index_u1(); }
223 // Get an unsigned 2-byte index, swapping the bytes if necessary.
224 int get_index_u2() const { assert_raw_stream(false);
225 return bytecode()->get_index_u2(raw_code(), false); }
226 // Get an unsigned 2-byte index in native order.
227 int get_index_u2_cpcache() const { assert_raw_stream(false);
228 return bytecode()->get_index_u2_cpcache(raw_code()); }
229 int get_index_u4() const { assert_raw_stream(false);
230 return bytecode()->get_index_u4(raw_code()); }
231 bool has_index_u4() const { return bytecode()->has_index_u4(raw_code()); }
232 };
233
234 #endif // SHARE_VM_INTERPRETER_BYTECODESTREAM_HPP
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