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 /*

  * Copyright (c) 1997, 2013, 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 "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(err_msg("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 iterat_parameters when fingerprint is known

 void SignatureIterator::iterate_parameters( uint64_t fingerprint ) {

   uint64_t saved_fingerprint = fingerprint;

   // Check for too many arguments

   if ( fingerprint == UCONST64(-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 %d", 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;

   }

 }