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src/hotspot/share/interpreter/bytecodeUtils.cpp

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 963     case Bytecodes::_athrow:
 964       stack->pop(-Bytecodes::depth(code));
 965       flow_ended = true;
 966       break;
 967 
 968     case Bytecodes::_getstatic:
 969     case Bytecodes::_getfield: {
 970       // Find out the type of the field accessed.
 971       int cp_index = Bytes::get_native_u2(code_base + pos) DEBUG_ONLY(+ ConstantPool::CPCACHE_INDEX_TAG);
 972       ConstantPool* cp = _method->constants();
 973       int name_and_type_index = cp->name_and_type_ref_index_at(cp_index);
 974       int type_index = cp->signature_ref_index_at(name_and_type_index);
 975       Symbol* signature = cp->symbol_at(type_index);
 976       // Simulate the bytecode: pop the address, push the 'value' loaded
 977       // from the field.
 978       stack->pop(1 - Bytecodes::depth(code));
 979       stack->push(bci, Signature::basic_type(signature));
 980       break;
 981     }
 982 

 983     case Bytecodes::_putstatic:
 984     case Bytecodes::_putfield: {
 985       int cp_index = Bytes::get_native_u2(code_base + pos) DEBUG_ONLY(+ ConstantPool::CPCACHE_INDEX_TAG);
 986       ConstantPool* cp = _method->constants();
 987       int name_and_type_index = cp->name_and_type_ref_index_at(cp_index);
 988       int type_index = cp->signature_ref_index_at(name_and_type_index);
 989       Symbol* signature = cp->symbol_at(type_index);
 990       BasicType bt = Signature::basic_type(signature);
 991       stack->pop(type2size[bt] - Bytecodes::depth(code) - 1);
 992       break;
 993     }
 994 
 995     case Bytecodes::_invokevirtual:
 996     case Bytecodes::_invokespecial:
 997     case Bytecodes::_invokestatic:
 998     case Bytecodes::_invokeinterface:
 999     case Bytecodes::_invokedynamic: {
1000       ConstantPool* cp = _method->constants();
1001       int cp_index;
1002 

1094 }
1095 
1096 #define INVALID_BYTECODE_ENCOUNTERED -1
1097 #define NPE_EXPLICIT_CONSTRUCTED -2
1098 int ExceptionMessageBuilder::get_NPE_null_slot(int bci) {
1099   // Get the bytecode.
1100   address code_base = _method->constMethod()->code_base();
1101   Bytecodes::Code code = Bytecodes::java_code_at(_method, code_base + bci);
1102   int pos = bci + 1;  // Position of argument of the bytecode.
1103   if (code == Bytecodes::_wide) {
1104     code = Bytecodes::java_code_at(_method, code_base + bci + 1);
1105     pos += 1;
1106   }
1107 
1108   switch (code) {
1109     case Bytecodes::_getfield:
1110     case Bytecodes::_arraylength:
1111     case Bytecodes::_athrow:
1112     case Bytecodes::_monitorenter:
1113     case Bytecodes::_monitorexit:

1114       return 0;
1115     case Bytecodes::_iaload:
1116     case Bytecodes::_faload:
1117     case Bytecodes::_aaload:
1118     case Bytecodes::_baload:
1119     case Bytecodes::_caload:
1120     case Bytecodes::_saload:
1121     case Bytecodes::_laload:
1122     case Bytecodes::_daload:
1123       return 1;
1124     case Bytecodes::_iastore:
1125     case Bytecodes::_fastore:
1126     case Bytecodes::_aastore:
1127     case Bytecodes::_bastore:
1128     case Bytecodes::_castore:
1129     case Bytecodes::_sastore:
1130       return 2;
1131     case Bytecodes::_lastore:
1132     case Bytecodes::_dastore:
1133       return 3;

1134     case Bytecodes::_putfield: {
1135         int cp_index = Bytes::get_native_u2(code_base + pos) DEBUG_ONLY(+ ConstantPool::CPCACHE_INDEX_TAG);
1136         ConstantPool* cp = _method->constants();
1137         int name_and_type_index = cp->name_and_type_ref_index_at(cp_index);
1138         int type_index = cp->signature_ref_index_at(name_and_type_index);
1139         Symbol* signature = cp->symbol_at(type_index);
1140         BasicType bt = Signature::basic_type(signature);
1141         return type2size[bt];
1142       }
1143     case Bytecodes::_invokevirtual:
1144     case Bytecodes::_invokespecial:
1145     case Bytecodes::_invokeinterface: {
1146         int cp_index = Bytes::get_native_u2(code_base+ pos) DEBUG_ONLY(+ ConstantPool::CPCACHE_INDEX_TAG);
1147         ConstantPool* cp = _method->constants();
1148         int name_and_type_index = cp->name_and_type_ref_index_at(cp_index);
1149         int name_index = cp->name_ref_index_at(name_and_type_index);
1150         Symbol* name = cp->symbol_at(name_index);
1151 
1152         // Assume the the call of a constructor can never cause a NullPointerException
1153         // (which is true in Java). This is mainly used to avoid generating wrong
1154         // messages for NullPointerExceptions created explicitly by new in Java code.
1155         if (name != vmSymbols::object_initializer_name()) {
1156           int     type_index = cp->signature_ref_index_at(name_and_type_index);
1157           Symbol* signature  = cp->symbol_at(type_index);
1158           // The 'this' parameter was null. Return the slot of it.
1159           return ArgumentSizeComputer(signature).size();
1160         } else {
1161           return NPE_EXPLICIT_CONSTRUCTED;
1162         }
1163       }
1164 
1165     default:
1166       break;
1167   }
1168 
1169   return INVALID_BYTECODE_ENCOUNTERED;
1170 }
1171 
1172 bool ExceptionMessageBuilder::print_NPE_cause(outputStream* os, int bci, int slot) {
1173   if (print_NPE_cause0(os, bci, slot, _max_cause_detail, false, " because \"")) {
1174     os->print("\" is null");






1175     return true;
1176   }
1177   return false;
1178 }
1179 
1180 // Recursively print what was null.
1181 //
1182 // Go to the bytecode that pushed slot 'slot' on the operand stack
1183 // at bytecode 'bci'. Compute a message for that bytecode. If
1184 // necessary (array, field), recur further.
1185 // At most do max_detail recursions.
1186 // Prefix is used to print a proper beginning of the whole
1187 // sentence.
1188 // inner_expr is used to omit some text, like 'static' in
1189 // inner expressions like array subscripts.
1190 //
1191 // Returns true if something was printed.
1192 //
1193 bool ExceptionMessageBuilder::print_NPE_cause0(outputStream* os, int bci, int slot,
1194                                                int max_detail,

1404       os->print("Cannot store to long array"); break;
1405     case Bytecodes::_dastore:
1406       os->print("Cannot store to double array"); break;
1407 
1408     case Bytecodes::_arraylength:
1409       os->print("Cannot read the array length"); break;
1410     case Bytecodes::_athrow:
1411       os->print("Cannot throw exception"); break;
1412     case Bytecodes::_monitorenter:
1413       os->print("Cannot enter synchronized block"); break;
1414     case Bytecodes::_monitorexit:
1415       os->print("Cannot exit synchronized block"); break;
1416     case Bytecodes::_getfield: {
1417         int cp_index = Bytes::get_native_u2(code_base + pos) DEBUG_ONLY(+ ConstantPool::CPCACHE_INDEX_TAG);
1418         ConstantPool* cp = _method->constants();
1419         int name_and_type_index = cp->name_and_type_ref_index_at(cp_index);
1420         int name_index = cp->name_ref_index_at(name_and_type_index);
1421         Symbol* name = cp->symbol_at(name_index);
1422         os->print("Cannot read field \"%s\"", name->as_C_string());
1423       } break;

1424     case Bytecodes::_putfield: {
1425         int cp_index = Bytes::get_native_u2(code_base + pos) DEBUG_ONLY(+ ConstantPool::CPCACHE_INDEX_TAG);
1426         os->print("Cannot assign field \"%s\"", get_field_name(_method, cp_index));
1427       } break;
1428     case Bytecodes::_invokevirtual:
1429     case Bytecodes::_invokespecial:
1430     case Bytecodes::_invokeinterface: {
1431         int cp_index = Bytes::get_native_u2(code_base+ pos) DEBUG_ONLY(+ ConstantPool::CPCACHE_INDEX_TAG);
1432         os->print("Cannot invoke \"");
1433         print_method_name(os, _method, cp_index);
1434         os->print("\"");
1435       } break;





1436 
1437     default:
1438       assert(0, "We should have checked this bytecode in get_NPE_null_slot().");
1439       break;
1440   }
1441 }
1442 
1443 // Main API
1444 bool BytecodeUtils::get_NPE_message_at(outputStream* ss, Method* method, int bci) {
1445 
1446   NoSafepointVerifier _nsv;   // Cannot use this object over a safepoint.
1447 
1448   // If this NPE was created via reflection, we have no real NPE.
1449   if (method->method_holder() ==
1450       vmClasses::reflect_NativeConstructorAccessorImpl_klass()) {
1451     return false;
1452   }
1453 
1454   // Analyse the bytecodes.
1455   ResourceMark rm;

 963     case Bytecodes::_athrow:
 964       stack->pop(-Bytecodes::depth(code));
 965       flow_ended = true;
 966       break;
 967 
 968     case Bytecodes::_getstatic:
 969     case Bytecodes::_getfield: {
 970       // Find out the type of the field accessed.
 971       int cp_index = Bytes::get_native_u2(code_base + pos) DEBUG_ONLY(+ ConstantPool::CPCACHE_INDEX_TAG);
 972       ConstantPool* cp = _method->constants();
 973       int name_and_type_index = cp->name_and_type_ref_index_at(cp_index);
 974       int type_index = cp->signature_ref_index_at(name_and_type_index);
 975       Symbol* signature = cp->symbol_at(type_index);
 976       // Simulate the bytecode: pop the address, push the 'value' loaded
 977       // from the field.
 978       stack->pop(1 - Bytecodes::depth(code));
 979       stack->push(bci, Signature::basic_type(signature));
 980       break;
 981     }
 982 
 983     case Bytecodes::_withfield:
 984     case Bytecodes::_putstatic:
 985     case Bytecodes::_putfield: {
 986       int cp_index = Bytes::get_native_u2(code_base + pos) DEBUG_ONLY(+ ConstantPool::CPCACHE_INDEX_TAG);
 987       ConstantPool* cp = _method->constants();
 988       int name_and_type_index = cp->name_and_type_ref_index_at(cp_index);
 989       int type_index = cp->signature_ref_index_at(name_and_type_index);
 990       Symbol* signature = cp->symbol_at(type_index);
 991       BasicType bt = Signature::basic_type(signature);
 992       stack->pop(type2size[bt] - Bytecodes::depth(code) - 1);
 993       break;
 994     }
 995 
 996     case Bytecodes::_invokevirtual:
 997     case Bytecodes::_invokespecial:
 998     case Bytecodes::_invokestatic:
 999     case Bytecodes::_invokeinterface:
1000     case Bytecodes::_invokedynamic: {
1001       ConstantPool* cp = _method->constants();
1002       int cp_index;
1003 

1095 }
1096 
1097 #define INVALID_BYTECODE_ENCOUNTERED -1
1098 #define NPE_EXPLICIT_CONSTRUCTED -2
1099 int ExceptionMessageBuilder::get_NPE_null_slot(int bci) {
1100   // Get the bytecode.
1101   address code_base = _method->constMethod()->code_base();
1102   Bytecodes::Code code = Bytecodes::java_code_at(_method, code_base + bci);
1103   int pos = bci + 1;  // Position of argument of the bytecode.
1104   if (code == Bytecodes::_wide) {
1105     code = Bytecodes::java_code_at(_method, code_base + bci + 1);
1106     pos += 1;
1107   }
1108 
1109   switch (code) {
1110     case Bytecodes::_getfield:
1111     case Bytecodes::_arraylength:
1112     case Bytecodes::_athrow:
1113     case Bytecodes::_monitorenter:
1114     case Bytecodes::_monitorexit:
1115     case Bytecodes::_checkcast:
1116       return 0;
1117     case Bytecodes::_iaload:
1118     case Bytecodes::_faload:
1119     case Bytecodes::_aaload:
1120     case Bytecodes::_baload:
1121     case Bytecodes::_caload:
1122     case Bytecodes::_saload:
1123     case Bytecodes::_laload:
1124     case Bytecodes::_daload:
1125       return 1;
1126     case Bytecodes::_iastore:
1127     case Bytecodes::_fastore:
1128     case Bytecodes::_aastore:
1129     case Bytecodes::_bastore:
1130     case Bytecodes::_castore:
1131     case Bytecodes::_sastore:
1132       return 2;
1133     case Bytecodes::_lastore:
1134     case Bytecodes::_dastore:
1135       return 3;
1136     case Bytecodes::_withfield:
1137     case Bytecodes::_putfield: {
1138         int cp_index = Bytes::get_native_u2(code_base + pos) DEBUG_ONLY(+ ConstantPool::CPCACHE_INDEX_TAG);
1139         ConstantPool* cp = _method->constants();
1140         int name_and_type_index = cp->name_and_type_ref_index_at(cp_index);
1141         int type_index = cp->signature_ref_index_at(name_and_type_index);
1142         Symbol* signature = cp->symbol_at(type_index);
1143         BasicType bt = Signature::basic_type(signature);
1144         return type2size[bt];
1145       }
1146     case Bytecodes::_invokevirtual:
1147     case Bytecodes::_invokespecial:
1148     case Bytecodes::_invokeinterface: {
1149         int cp_index = Bytes::get_native_u2(code_base+ pos) DEBUG_ONLY(+ ConstantPool::CPCACHE_INDEX_TAG);
1150         ConstantPool* cp = _method->constants();
1151         int name_and_type_index = cp->name_and_type_ref_index_at(cp_index);
1152         int name_index = cp->name_ref_index_at(name_and_type_index);
1153         Symbol* name = cp->symbol_at(name_index);
1154 
1155         // Assume the the call of a constructor can never cause a NullPointerException
1156         // (which is true in Java). This is mainly used to avoid generating wrong
1157         // messages for NullPointerExceptions created explicitly by new in Java code.
1158         if (name != vmSymbols::object_initializer_name()) {
1159           int     type_index = cp->signature_ref_index_at(name_and_type_index);
1160           Symbol* signature  = cp->symbol_at(type_index);
1161           // The 'this' parameter was null. Return the slot of it.
1162           return ArgumentSizeComputer(signature).size();
1163         } else {
1164           return NPE_EXPLICIT_CONSTRUCTED;
1165         }
1166       }
1167 
1168     default:
1169       break;
1170   }
1171 
1172   return INVALID_BYTECODE_ENCOUNTERED;
1173 }
1174 
1175 bool ExceptionMessageBuilder::print_NPE_cause(outputStream* os, int bci, int slot) {
1176   if (print_NPE_cause0(os, bci, slot, _max_cause_detail, false, " because \"")) {
1177     address code_base = _method->constMethod()->code_base();
1178     Bytecodes::Code code = Bytecodes::java_code_at(_method, code_base + bci);
1179     if (code == Bytecodes::_aastore) {
1180       os->print("\" is null or is a null-free array and there's an attempt to store null in it");
1181     } else {
1182       os->print("\" is null");
1183     }
1184     return true;
1185   }
1186   return false;
1187 }
1188 
1189 // Recursively print what was null.
1190 //
1191 // Go to the bytecode that pushed slot 'slot' on the operand stack
1192 // at bytecode 'bci'. Compute a message for that bytecode. If
1193 // necessary (array, field), recur further.
1194 // At most do max_detail recursions.
1195 // Prefix is used to print a proper beginning of the whole
1196 // sentence.
1197 // inner_expr is used to omit some text, like 'static' in
1198 // inner expressions like array subscripts.
1199 //
1200 // Returns true if something was printed.
1201 //
1202 bool ExceptionMessageBuilder::print_NPE_cause0(outputStream* os, int bci, int slot,
1203                                                int max_detail,

1413       os->print("Cannot store to long array"); break;
1414     case Bytecodes::_dastore:
1415       os->print("Cannot store to double array"); break;
1416 
1417     case Bytecodes::_arraylength:
1418       os->print("Cannot read the array length"); break;
1419     case Bytecodes::_athrow:
1420       os->print("Cannot throw exception"); break;
1421     case Bytecodes::_monitorenter:
1422       os->print("Cannot enter synchronized block"); break;
1423     case Bytecodes::_monitorexit:
1424       os->print("Cannot exit synchronized block"); break;
1425     case Bytecodes::_getfield: {
1426         int cp_index = Bytes::get_native_u2(code_base + pos) DEBUG_ONLY(+ ConstantPool::CPCACHE_INDEX_TAG);
1427         ConstantPool* cp = _method->constants();
1428         int name_and_type_index = cp->name_and_type_ref_index_at(cp_index);
1429         int name_index = cp->name_ref_index_at(name_and_type_index);
1430         Symbol* name = cp->symbol_at(name_index);
1431         os->print("Cannot read field \"%s\"", name->as_C_string());
1432       } break;
1433     case Bytecodes::_withfield:
1434     case Bytecodes::_putfield: {
1435         int cp_index = Bytes::get_native_u2(code_base + pos) DEBUG_ONLY(+ ConstantPool::CPCACHE_INDEX_TAG);
1436         os->print("Cannot assign field \"%s\"", get_field_name(_method, cp_index));
1437       } break;
1438     case Bytecodes::_invokevirtual:
1439     case Bytecodes::_invokespecial:
1440     case Bytecodes::_invokeinterface: {
1441         int cp_index = Bytes::get_native_u2(code_base+ pos) DEBUG_ONLY(+ ConstantPool::CPCACHE_INDEX_TAG);
1442         os->print("Cannot invoke \"");
1443         print_method_name(os, _method, cp_index);
1444         os->print("\"");
1445       } break;
1446     case Bytecodes::_checkcast: {
1447         int cp_index = Bytes::get_Java_u2(code_base + pos);
1448         ConstantPool* cp = _method->constants();
1449         os->print("Cannot cast to null-free type \"%s\"", cp->klass_at_noresolve(cp_index)->as_C_string());
1450       } break;
1451 
1452     default:
1453       assert(0, "We should have checked this bytecode in get_NPE_null_slot().");
1454       break;
1455   }
1456 }
1457 
1458 // Main API
1459 bool BytecodeUtils::get_NPE_message_at(outputStream* ss, Method* method, int bci) {
1460 
1461   NoSafepointVerifier _nsv;   // Cannot use this object over a safepoint.
1462 
1463   // If this NPE was created via reflection, we have no real NPE.
1464   if (method->method_holder() ==
1465       vmClasses::reflect_NativeConstructorAccessorImpl_klass()) {
1466     return false;
1467   }
1468 
1469   // Analyse the bytecodes.
1470   ResourceMark rm;
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