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comparison src/share/vm/interpreter/bytecodeStream.hpp @ 2142:8012aa3ccede

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4926272: methodOopDesc::method_from_bcp is unsafe Reviewed-by: coleenp, jrose, kvn, dcubed
author never
date Thu, 13 Jan 2011 22:15:41 -0800
parents f95d63e2154a
children b92c45f2bc75
comparison
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2130:34d64ad817f4 2142:8012aa3ccede
1 /* 1 /*
2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. 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. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 * 4 *
5 * This code is free software; you can redistribute it and/or modify it 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 6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. 7 * published by the Free Software Foundation.
103 bool is_wide() const { return _is_wide; } 103 bool is_wide() const { return _is_wide; }
104 int instruction_size() const { return (_next_bci - _bci); } 104 int instruction_size() const { return (_next_bci - _bci); }
105 bool is_last_bytecode() const { return _next_bci >= _end_bci; } 105 bool is_last_bytecode() const { return _next_bci >= _end_bci; }
106 106
107 address bcp() const { return method()->code_base() + _bci; } 107 address bcp() const { return method()->code_base() + _bci; }
108 Bytecode* bytecode() const { return Bytecode_at(bcp()); } 108 Bytecode bytecode() const { return Bytecode(_method(), bcp()); }
109 109
110 // State changes 110 // State changes
111 void set_next_bci(int bci) { assert(0 <= bci && bci <= method()->code_size(), "illegal bci"); _next_bci = bci; } 111 void set_next_bci(int bci) { assert(0 <= bci && bci <= method()->code_size(), "illegal bci"); _next_bci = bci; }
112 112
113 // Bytecode-specific attributes 113 // Bytecode-specific attributes
114 int dest() const { return bci() + bytecode()->get_offset_s2(raw_code()); } 114 int dest() const { return bci() + bytecode().get_offset_s2(raw_code()); }
115 int dest_w() const { return bci() + bytecode()->get_offset_s4(raw_code()); } 115 int dest_w() const { return bci() + bytecode().get_offset_s4(raw_code()); }
116 116
117 // One-byte indices. 117 // One-byte indices.
118 int get_index_u1() const { assert_raw_index_size(1); return *(jubyte*)(bcp()+1); } 118 int get_index_u1() const { assert_raw_index_size(1); return *(jubyte*)(bcp()+1); }
119 119
120 protected: 120 protected:
187 // indicate end of bytecode stream 187 // indicate end of bytecode stream
188 raw_code = code = Bytecodes::_illegal; 188 raw_code = code = Bytecodes::_illegal;
189 } else { 189 } else {
190 // get bytecode 190 // get bytecode
191 address bcp = this->bcp(); 191 address bcp = this->bcp();
192 raw_code = Bytecodes::code_at(bcp); 192 raw_code = Bytecodes::code_at(_method(), bcp);
193 code = Bytecodes::java_code(raw_code); 193 code = Bytecodes::java_code(raw_code);
194 // set next bytecode position 194 // set next bytecode position
195 // 195 //
196 // note that we cannot advance before having the 196 // note that we cannot advance before having the
197 // tty bytecode otherwise the stepping is wrong! 197 // tty bytecode otherwise the stepping is wrong!
198 // (carefull: length_for(...) must be used first!) 198 // (carefull: length_for(...) must be used first!)
199 int l = Bytecodes::length_for(code); 199 int l = Bytecodes::length_for(code);
200 if (l == 0) l = Bytecodes::length_at(bcp); 200 if (l == 0) l = Bytecodes::length_at(_method(), bcp);
201 _next_bci += l; 201 _next_bci += l;
202 assert(_bci < _next_bci, "length must be > 0"); 202 assert(_bci < _next_bci, "length must be > 0");
203 // set attributes 203 // set attributes
204 _is_wide = false; 204 _is_wide = false;
205 // check for special (uncommon) cases 205 // check for special (uncommon) cases
217 217
218 bool is_active_breakpoint() const { return Bytecodes::is_active_breakpoint_at(bcp()); } 218 bool is_active_breakpoint() const { return Bytecodes::is_active_breakpoint_at(bcp()); }
219 Bytecodes::Code code() const { return _code; } 219 Bytecodes::Code code() const { return _code; }
220 220
221 // Unsigned indices, widening 221 // Unsigned indices, widening
222 int get_index() const { return is_wide() ? bytecode()->get_index_u2(raw_code(), true) : get_index_u1(); } 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. 223 // Get an unsigned 2-byte index, swapping the bytes if necessary.
224 int get_index_u2() const { assert_raw_stream(false); 224 int get_index_u2() const { assert_raw_stream(false);
225 return bytecode()->get_index_u2(raw_code(), false); } 225 return bytecode().get_index_u2(raw_code(), false); }
226 // Get an unsigned 2-byte index in native order. 226 // Get an unsigned 2-byte index in native order.
227 int get_index_u2_cpcache() const { assert_raw_stream(false); 227 int get_index_u2_cpcache() const { assert_raw_stream(false);
228 return bytecode()->get_index_u2_cpcache(raw_code()); } 228 return bytecode().get_index_u2_cpcache(raw_code()); }
229 int get_index_u4() const { assert_raw_stream(false); 229 int get_index_u4() const { assert_raw_stream(false);
230 return bytecode()->get_index_u4(raw_code()); } 230 return bytecode().get_index_u4(raw_code()); }
231 bool has_index_u4() const { return bytecode()->has_index_u4(raw_code()); } 231 bool has_index_u4() const { return bytecode().has_index_u4(raw_code()); }
232 }; 232 };
233 233
234 #endif // SHARE_VM_INTERPRETER_BYTECODESTREAM_HPP 234 #endif // SHARE_VM_INTERPRETER_BYTECODESTREAM_HPP