CheckedExceptionElement* ConstMethod::checked_exceptions_start() const { u2* addr = checked_exceptions_length_addr(); u2 length = *addr; assert(length > 0, "should only be called if table is present"); addr -= length * sizeof(CheckedExceptionElement) / sizeof(u2); return (CheckedExceptionElement*) addr; }
void ConstMethod::verify_on(outputStream* st) { guarantee(is_constMethod(), "object must be constMethod"); // Verification can occur during oop construction before the method or // other fields have been initialized. guarantee(method()->is_method(), "should be method"); address m_end = (address)((intptr_t) this + size()); address compressed_table_start = code_end(); guarantee(compressed_table_start <= m_end, "invalid method layout"); address compressed_table_end = compressed_table_start; // Verify line number table if (has_linenumber_table()) { CompressedLineNumberReadStream stream(compressed_linenumber_table()); while (stream.read_pair()) { guarantee(stream.bci() >= 0 && stream.bci() <= code_size(), "invalid bci in line number table"); } compressed_table_end += stream.position(); } guarantee(compressed_table_end <= m_end, "invalid method layout"); // Verify checked exceptions, exception table and local variable tables if (has_method_parameters()) { u2* addr = method_parameters_length_addr(); guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout"); } if (has_checked_exceptions()) { u2* addr = checked_exceptions_length_addr(); guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout"); } if (has_exception_handler()) { u2* addr = exception_table_length_addr(); guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout"); } if (has_localvariable_table()) { u2* addr = localvariable_table_length_addr(); guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout"); } // Check compressed_table_end relative to uncompressed_table_start u2* uncompressed_table_start; if (has_localvariable_table()) { uncompressed_table_start = (u2*) localvariable_table_start(); } else if (has_exception_handler()) { uncompressed_table_start = (u2*) exception_table_start(); } else if (has_checked_exceptions()) { uncompressed_table_start = (u2*) checked_exceptions_start(); } else if (has_method_parameters()) { uncompressed_table_start = (u2*) method_parameters_start(); } else { uncompressed_table_start = (u2*) m_end; } int gap = (intptr_t) uncompressed_table_start - (intptr_t) compressed_table_end; int max_gap = align_metadata_size(1)*BytesPerWord; guarantee(gap >= 0 && gap < max_gap, "invalid method layout"); }
// Update the flags to indicate the presence of these optional fields. void ConstMethod::set_inlined_tables_length(InlineTableSizes* sizes) { _flags = 0; if (sizes->compressed_linenumber_size() > 0) _flags |= _has_linenumber_table; if (sizes->generic_signature_index() != 0) _flags |= _has_generic_signature; if (sizes->method_parameters_length() >= 0) _flags |= _has_method_parameters; if (sizes->checked_exceptions_length() > 0) _flags |= _has_checked_exceptions; if (sizes->exception_table_length() > 0) _flags |= _has_exception_table; if (sizes->localvariable_table_length() > 0) _flags |= _has_localvariable_table; // annotations, they are all pointer sized embedded objects so don't have // a length embedded also. if (sizes->method_annotations_length() > 0) _flags |= _has_method_annotations; if (sizes->parameter_annotations_length() > 0) _flags |= _has_parameter_annotations; if (sizes->type_annotations_length() > 0) _flags |= _has_type_annotations; if (sizes->default_annotations_length() > 0) _flags |= _has_default_annotations; // This code is extremely brittle and should possibly be revised. // The *_length_addr functions walk backwards through the // constMethod data, using each of the length indexes ahead of them, // as well as the flags variable. Therefore, the indexes must be // initialized in reverse order, or else they will compute the wrong // offsets. Moving the initialization of _flags into a separate // block solves *half* of the problem, but the following part will // still break if the order is not exactly right. // // Also, the servicability agent needs to be informed anytime // anything is added here. It might be advisable to have some sort // of indication of this inline. if (sizes->generic_signature_index() != 0) *(generic_signature_index_addr()) = sizes->generic_signature_index(); // New data should probably go here. if (sizes->method_parameters_length() >= 0) *(method_parameters_length_addr()) = sizes->method_parameters_length(); if (sizes->checked_exceptions_length() > 0) *(checked_exceptions_length_addr()) = sizes->checked_exceptions_length(); if (sizes->exception_table_length() > 0) *(exception_table_length_addr()) = sizes->exception_table_length(); if (sizes->localvariable_table_length() > 0) *(localvariable_table_length_addr()) = sizes->localvariable_table_length(); }
// Update the flags to indicate the presence of these optional fields. void constMethodOopDesc::set_inlined_tables_length( int checked_exceptions_len, int compressed_line_number_size, int localvariable_table_len) { // Must be done in the order below, otherwise length_addr accessors // will not work. Only set bit in header if length is positive. assert(_flags == 0, "Error"); if (compressed_line_number_size > 0) { _flags |= _has_linenumber_table; } if (checked_exceptions_len > 0) { _flags |= _has_checked_exceptions; *(checked_exceptions_length_addr()) = checked_exceptions_len; } if (localvariable_table_len > 0) { _flags |= _has_localvariable_table; *(localvariable_table_length_addr()) = localvariable_table_len; } }
int ConstMethod::checked_exceptions_length() const { return has_checked_exceptions() ? *(checked_exceptions_length_addr()) : 0; }