u2* constMethodOopDesc::localvariable_table_length_addr() const {
assert(has_localvariable_table(), "called only if table is present");
if (has_checked_exceptions()) {
// If checked_exception present, locate immediately before them.
return (u2*) checked_exceptions_start() - 1;
} else {
// Else, the linenumber table is at the end of the constMethod.
return last_u2_element();
}
}
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");
}
u2* ConstMethod::exception_table_length_addr() const {
assert(has_exception_handler(), "called only if table is present");
if (has_checked_exceptions()) {
// If checked_exception present, locate immediately before them.
return (u2*) checked_exceptions_start() - 1;
} else {
if(has_method_parameters()) {
// If method parameters present, locate immediately before them.
return (u2*)method_parameters_start() - 1;
} else {
// Else, the exception table is at the end of the constMethod.
return has_generic_signature() ? (last_u2_element() - 1) :
last_u2_element();
}
}
}