| /* |
| * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| #include "classfile/symbolTable.hpp" |
| #include "classfile/systemDictionary.hpp" |
| #include "memory/oopFactory.hpp" |
| #include "memory/resourceArea.hpp" |
| #include "oops/instanceKlass.hpp" |
| #include "oops/oop.inline.hpp" |
| #include "oops/symbol.hpp" |
| #include "oops/typeArrayKlass.hpp" |
| #include "runtime/signature.hpp" |
| |
| // Implementation of SignatureIterator |
| |
| // Signature syntax: |
| // |
| // Signature = "(" {Parameter} ")" ReturnType. |
| // Parameter = FieldType. |
| // ReturnType = FieldType | "V". |
| // FieldType = "B" | "C" | "D" | "F" | "I" | "J" | "S" | "Z" | "L" ClassName ";" | "[" FieldType. |
| // ClassName = string. |
| |
| |
| SignatureIterator::SignatureIterator(Symbol* signature) { |
| _signature = signature; |
| _parameter_index = 0; |
| } |
| |
| void SignatureIterator::expect(char c) { |
| if (_signature->byte_at(_index) != c) fatal("expecting %c", c); |
| _index++; |
| } |
| |
| |
| void SignatureIterator::skip_optional_size() { |
| Symbol* sig = _signature; |
| char c = sig->byte_at(_index); |
| while ('0' <= c && c <= '9') c = sig->byte_at(++_index); |
| } |
| |
| |
| int SignatureIterator::parse_type() { |
| // Note: This function could be simplified by using "return T_XXX_size;" |
| // instead of the assignment and the break statements. However, it |
| // seems that the product build for win32_i486 with MS VC++ 6.0 doesn't |
| // work (stack underflow for some tests) - this seems to be a VC++ 6.0 |
| // compiler bug (was problem - gri 4/27/2000). |
| int size = -1; |
| switch(_signature->byte_at(_index)) { |
| case 'B': do_byte (); if (_parameter_index < 0 ) _return_type = T_BYTE; |
| _index++; size = T_BYTE_size ; break; |
| case 'C': do_char (); if (_parameter_index < 0 ) _return_type = T_CHAR; |
| _index++; size = T_CHAR_size ; break; |
| case 'D': do_double(); if (_parameter_index < 0 ) _return_type = T_DOUBLE; |
| _index++; size = T_DOUBLE_size ; break; |
| case 'F': do_float (); if (_parameter_index < 0 ) _return_type = T_FLOAT; |
| _index++; size = T_FLOAT_size ; break; |
| case 'I': do_int (); if (_parameter_index < 0 ) _return_type = T_INT; |
| _index++; size = T_INT_size ; break; |
| case 'J': do_long (); if (_parameter_index < 0 ) _return_type = T_LONG; |
| _index++; size = T_LONG_size ; break; |
| case 'S': do_short (); if (_parameter_index < 0 ) _return_type = T_SHORT; |
| _index++; size = T_SHORT_size ; break; |
| case 'Z': do_bool (); if (_parameter_index < 0 ) _return_type = T_BOOLEAN; |
| _index++; size = T_BOOLEAN_size; break; |
| case 'V': do_void (); if (_parameter_index < 0 ) _return_type = T_VOID; |
| _index++; size = T_VOID_size; ; break; |
| case 'L': |
| { int begin = ++_index; |
| Symbol* sig = _signature; |
| while (sig->byte_at(_index++) != ';') ; |
| do_object(begin, _index); |
| } |
| if (_parameter_index < 0 ) _return_type = T_OBJECT; |
| size = T_OBJECT_size; |
| break; |
| case '[': |
| { int begin = ++_index; |
| skip_optional_size(); |
| Symbol* sig = _signature; |
| while (sig->byte_at(_index) == '[') { |
| _index++; |
| skip_optional_size(); |
| } |
| if (sig->byte_at(_index) == 'L') { |
| while (sig->byte_at(_index++) != ';') ; |
| } else { |
| _index++; |
| } |
| do_array(begin, _index); |
| if (_parameter_index < 0 ) _return_type = T_ARRAY; |
| } |
| size = T_ARRAY_size; |
| break; |
| default: |
| ShouldNotReachHere(); |
| break; |
| } |
| assert(size >= 0, "size must be set"); |
| return size; |
| } |
| |
| |
| void SignatureIterator::check_signature_end() { |
| if (_index < _signature->utf8_length()) { |
| tty->print_cr("too many chars in signature"); |
| _signature->print_value_on(tty); |
| tty->print_cr(" @ %d", _index); |
| } |
| } |
| |
| |
| void SignatureIterator::dispatch_field() { |
| // no '(', just one (field) type |
| _index = 0; |
| _parameter_index = 0; |
| parse_type(); |
| check_signature_end(); |
| } |
| |
| |
| void SignatureIterator::iterate_parameters() { |
| // Parse parameters |
| _index = 0; |
| _parameter_index = 0; |
| expect('('); |
| while (_signature->byte_at(_index) != ')') _parameter_index += parse_type(); |
| expect(')'); |
| _parameter_index = 0; |
| } |
| |
| // Optimized version of iterate_parameters when fingerprint is known |
| void SignatureIterator::iterate_parameters( uint64_t fingerprint ) { |
| uint64_t saved_fingerprint = fingerprint; |
| |
| // Check for too many arguments |
| if (fingerprint == (uint64_t)CONST64(-1)) { |
| SignatureIterator::iterate_parameters(); |
| return; |
| } |
| |
| assert(fingerprint, "Fingerprint should not be 0"); |
| |
| _parameter_index = 0; |
| fingerprint = fingerprint >> (static_feature_size + result_feature_size); |
| while ( 1 ) { |
| switch ( fingerprint & parameter_feature_mask ) { |
| case bool_parm: |
| do_bool(); |
| _parameter_index += T_BOOLEAN_size; |
| break; |
| case byte_parm: |
| do_byte(); |
| _parameter_index += T_BYTE_size; |
| break; |
| case char_parm: |
| do_char(); |
| _parameter_index += T_CHAR_size; |
| break; |
| case short_parm: |
| do_short(); |
| _parameter_index += T_SHORT_size; |
| break; |
| case int_parm: |
| do_int(); |
| _parameter_index += T_INT_size; |
| break; |
| case obj_parm: |
| do_object(0, 0); |
| _parameter_index += T_OBJECT_size; |
| break; |
| case long_parm: |
| do_long(); |
| _parameter_index += T_LONG_size; |
| break; |
| case float_parm: |
| do_float(); |
| _parameter_index += T_FLOAT_size; |
| break; |
| case double_parm: |
| do_double(); |
| _parameter_index += T_DOUBLE_size; |
| break; |
| case done_parm: |
| return; |
| break; |
| default: |
| tty->print_cr("*** parameter is " UINT64_FORMAT, fingerprint & parameter_feature_mask); |
| tty->print_cr("*** fingerprint is " PTR64_FORMAT, saved_fingerprint); |
| ShouldNotReachHere(); |
| break; |
| } |
| fingerprint >>= parameter_feature_size; |
| } |
| _parameter_index = 0; |
| } |
| |
| |
| void SignatureIterator::iterate_returntype() { |
| // Ignore parameters |
| _index = 0; |
| expect('('); |
| Symbol* sig = _signature; |
| while (sig->byte_at(_index) != ')') _index++; |
| expect(')'); |
| // Parse return type |
| _parameter_index = -1; |
| parse_type(); |
| check_signature_end(); |
| _parameter_index = 0; |
| } |
| |
| |
| void SignatureIterator::iterate() { |
| // Parse parameters |
| _parameter_index = 0; |
| _index = 0; |
| expect('('); |
| while (_signature->byte_at(_index) != ')') _parameter_index += parse_type(); |
| expect(')'); |
| // Parse return type |
| _parameter_index = -1; |
| parse_type(); |
| check_signature_end(); |
| _parameter_index = 0; |
| } |
| |
| |
| // Implementation of SignatureStream |
| SignatureStream::SignatureStream(Symbol* signature, bool is_method) : |
| _signature(signature), _at_return_type(false) { |
| _begin = _end = (is_method ? 1 : 0); // skip first '(' in method signatures |
| _names = new GrowableArray<Symbol*>(10); |
| next(); |
| } |
| |
| SignatureStream::~SignatureStream() { |
| // decrement refcount for names created during signature parsing |
| for (int i = 0; i < _names->length(); i++) { |
| _names->at(i)->decrement_refcount(); |
| } |
| } |
| |
| bool SignatureStream::is_done() const { |
| return _end > _signature->utf8_length(); |
| } |
| |
| |
| void SignatureStream::next_non_primitive(int t) { |
| switch (t) { |
| case 'L': { |
| _type = T_OBJECT; |
| Symbol* sig = _signature; |
| while (sig->byte_at(_end++) != ';'); |
| break; |
| } |
| case '[': { |
| _type = T_ARRAY; |
| Symbol* sig = _signature; |
| char c = sig->byte_at(_end); |
| while ('0' <= c && c <= '9') c = sig->byte_at(_end++); |
| while (sig->byte_at(_end) == '[') { |
| _end++; |
| c = sig->byte_at(_end); |
| while ('0' <= c && c <= '9') c = sig->byte_at(_end++); |
| } |
| switch(sig->byte_at(_end)) { |
| case 'B': |
| case 'C': |
| case 'D': |
| case 'F': |
| case 'I': |
| case 'J': |
| case 'S': |
| case 'Z':_end++; break; |
| default: { |
| while (sig->byte_at(_end++) != ';'); |
| break; |
| } |
| } |
| break; |
| } |
| case ')': _end++; next(); _at_return_type = true; break; |
| default : ShouldNotReachHere(); |
| } |
| } |
| |
| |
| bool SignatureStream::is_object() const { |
| return _type == T_OBJECT |
| || _type == T_ARRAY; |
| } |
| |
| bool SignatureStream::is_array() const { |
| return _type == T_ARRAY; |
| } |
| |
| Symbol* SignatureStream::as_symbol(TRAPS) { |
| // Create a symbol from for string _begin _end |
| int begin = _begin; |
| int end = _end; |
| |
| if ( _signature->byte_at(_begin) == 'L' |
| && _signature->byte_at(_end-1) == ';') { |
| begin++; |
| end--; |
| } |
| |
| // Save names for cleaning up reference count at the end of |
| // SignatureStream scope. |
| Symbol* name = SymbolTable::new_symbol(_signature, begin, end, CHECK_NULL); |
| _names->push(name); // save new symbol for decrementing later |
| return name; |
| } |
| |
| Klass* SignatureStream::as_klass(Handle class_loader, Handle protection_domain, |
| FailureMode failure_mode, TRAPS) { |
| if (!is_object()) return NULL; |
| Symbol* name = as_symbol(CHECK_NULL); |
| if (failure_mode == ReturnNull) { |
| return SystemDictionary::resolve_or_null(name, class_loader, protection_domain, THREAD); |
| } else { |
| bool throw_error = (failure_mode == NCDFError); |
| return SystemDictionary::resolve_or_fail(name, class_loader, protection_domain, throw_error, THREAD); |
| } |
| } |
| |
| oop SignatureStream::as_java_mirror(Handle class_loader, Handle protection_domain, |
| FailureMode failure_mode, TRAPS) { |
| if (!is_object()) |
| return Universe::java_mirror(type()); |
| Klass* klass = as_klass(class_loader, protection_domain, failure_mode, CHECK_NULL); |
| if (klass == NULL) return NULL; |
| return klass->java_mirror(); |
| } |
| |
| Symbol* SignatureStream::as_symbol_or_null() { |
| // Create a symbol from for string _begin _end |
| ResourceMark rm; |
| |
| int begin = _begin; |
| int end = _end; |
| |
| if ( _signature->byte_at(_begin) == 'L' |
| && _signature->byte_at(_end-1) == ';') { |
| begin++; |
| end--; |
| } |
| |
| char* buffer = NEW_RESOURCE_ARRAY(char, end - begin); |
| for (int index = begin; index < end; index++) { |
| buffer[index - begin] = _signature->byte_at(index); |
| } |
| Symbol* result = SymbolTable::probe(buffer, end - begin); |
| return result; |
| } |
| |
| int SignatureStream::reference_parameter_count() { |
| int args_count = 0; |
| for ( ; !at_return_type(); next()) { |
| if (is_object()) { |
| args_count++; |
| } |
| } |
| return args_count; |
| } |
| |
| bool SignatureVerifier::is_valid_signature(Symbol* sig) { |
| const char* signature = (const char*)sig->bytes(); |
| ssize_t len = sig->utf8_length(); |
| if (signature == NULL || signature[0] == '\0' || len < 1) { |
| return false; |
| } else if (signature[0] == '(') { |
| return is_valid_method_signature(sig); |
| } else { |
| return is_valid_type_signature(sig); |
| } |
| } |
| |
| bool SignatureVerifier::is_valid_method_signature(Symbol* sig) { |
| const char* method_sig = (const char*)sig->bytes(); |
| ssize_t len = sig->utf8_length(); |
| ssize_t index = 0; |
| if (method_sig != NULL && len > 1 && method_sig[index] == '(') { |
| ++index; |
| while (index < len && method_sig[index] != ')') { |
| ssize_t res = is_valid_type(&method_sig[index], len - index); |
| if (res == -1) { |
| return false; |
| } else { |
| index += res; |
| } |
| } |
| if (index < len && method_sig[index] == ')') { |
| // check the return type |
| ++index; |
| return (is_valid_type(&method_sig[index], len - index) == (len - index)); |
| } |
| } |
| return false; |
| } |
| |
| bool SignatureVerifier::is_valid_type_signature(Symbol* sig) { |
| const char* type_sig = (const char*)sig->bytes(); |
| ssize_t len = sig->utf8_length(); |
| return (type_sig != NULL && len >= 1 && |
| (is_valid_type(type_sig, len) == len)); |
| } |
| |
| // Checks to see if the type (not to go beyond 'limit') refers to a valid type. |
| // Returns -1 if it is not, or the index of the next character that is not part |
| // of the type. The type encoding may end before 'limit' and that's ok. |
| ssize_t SignatureVerifier::is_valid_type(const char* type, ssize_t limit) { |
| ssize_t index = 0; |
| |
| // Iterate over any number of array dimensions |
| while (index < limit && type[index] == '[') ++index; |
| if (index >= limit) { |
| return -1; |
| } |
| switch (type[index]) { |
| case 'B': case 'C': case 'D': case 'F': case 'I': |
| case 'J': case 'S': case 'Z': case 'V': |
| return index + 1; |
| case 'L': |
| for (index = index + 1; index < limit; ++index) { |
| char c = type[index]; |
| if (c == ';') { |
| return index + 1; |
| } |
| if (invalid_name_char(c)) { |
| return -1; |
| } |
| } |
| // fall through |
| default: ; // fall through |
| } |
| return -1; |
| } |
| |
| bool SignatureVerifier::invalid_name_char(char c) { |
| switch (c) { |
| case '\0': case '.': case ';': case '[': |
| return true; |
| default: |
| return false; |
| } |
| } |