Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright (c) 1998, 2010, 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 "code/exceptionHandlerTable.hpp"

 #include "code/nmethod.hpp"

 #include "memory/allocation.inline.hpp"

 void ExceptionHandlerTable::add_entry(HandlerTableEntry entry) {

   _nesting.check();

   if (_length >= _size) {

     // not enough space => grow the table (amortized growth, double its size)

     guarantee(_size > 0, "no space allocated => cannot grow the table since it is part of nmethod");

     int new_size = _size * 2;

     _table = REALLOC_RESOURCE_ARRAY(HandlerTableEntry, _table, _size, new_size);

     _size = new_size;

   }

   assert(_length < _size, "sanity check");

   _table[_length++] = entry;

 }

 HandlerTableEntry* ExceptionHandlerTable::subtable_for(int catch_pco) const {

   int i = 0;

   while (i < _length) {

     HandlerTableEntry* t = _table + i;

     if (t->pco() == catch_pco) {

       // found subtable matching the catch_pco

       return t;

     } else {

       // advance to next subtable

       i += t->len() + 1; // +1 for header

     }

   }

   return NULL;

 }

 ExceptionHandlerTable::ExceptionHandlerTable(int initial_size) {

   guarantee(initial_size > 0, "initial size must be > 0");

   _table  = NEW_RESOURCE_ARRAY(HandlerTableEntry, initial_size);

   _length = 0;

   _size   = initial_size;

 }

 ExceptionHandlerTable::ExceptionHandlerTable(const nmethod* nm) {

   _table  = (HandlerTableEntry*)nm->handler_table_begin();

   _length = nm->handler_table_size() / sizeof(HandlerTableEntry);

   _size   = 0; // no space allocated by ExeptionHandlerTable!

 }

 void ExceptionHandlerTable::add_subtable(

   int                 catch_pco,

   GrowableArray<intptr_t>* handler_bcis,

   GrowableArray<intptr_t>* scope_depths_from_top_scope,

   GrowableArray<intptr_t>* handler_pcos

 ) {

   assert(subtable_for(catch_pco) == NULL, "catch handlers for this catch_pco added twice");

   assert(handler_bcis->length() == handler_pcos->length(), "bci & pc table have different length");

   assert(scope_depths_from_top_scope == NULL || handler_bcis->length() == scope_depths_from_top_scope->length(), "bci & scope_depths table have different length");

   if (handler_bcis->length() > 0) {

     // add subtable header

     add_entry(HandlerTableEntry(handler_bcis->length(), catch_pco, 0));

     // add individual entries

     for (int i = 0; i < handler_bcis->length(); i++) {

       intptr_t scope_depth = 0;

       if (scope_depths_from_top_scope != NULL) {

         scope_depth = scope_depths_from_top_scope->at(i);

       }

       add_entry(HandlerTableEntry(handler_bcis->at(i), handler_pcos->at(i), scope_depth));

       assert(entry_for(catch_pco, handler_bcis->at(i), scope_depth)->pco() == handler_pcos->at(i), "entry not added correctly (1)");

       assert(entry_for(catch_pco, handler_bcis->at(i), scope_depth)->scope_depth() == scope_depth, "entry not added correctly (2)");

     }

   }

 }

 void ExceptionHandlerTable::copy_to(nmethod* nm) {

   assert(size_in_bytes() == nm->handler_table_size(), "size of space allocated in nmethod incorrect");

   memmove(nm->handler_table_begin(), _table, size_in_bytes());

 }

 HandlerTableEntry* ExceptionHandlerTable::entry_for(int catch_pco, int handler_bci, int scope_depth) const {

   HandlerTableEntry* t = subtable_for(catch_pco);

   if (t != NULL) {

     int l = t->len();

     while (l-- > 0) {

       t++;

       if (t->bci() == handler_bci && t->scope_depth() == scope_depth) return t;

     }

   }

   return NULL;

 }

 void ExceptionHandlerTable::print_subtable(HandlerTableEntry* t) const {

   int l = t->len();

   tty->print_cr("catch_pco = %d (%d entries)", t->pco(), l);

   while (l-- > 0) {

     t++;

     tty->print_cr("  bci %d at scope depth %d -> pco %d", t->bci(), t->scope_depth(), t->pco());

   }

 }

 void ExceptionHandlerTable::print() const {

   tty->print_cr("ExceptionHandlerTable (size = %d bytes)", size_in_bytes());

   int i = 0;

   while (i < _length) {

     HandlerTableEntry* t = _table + i;

     print_subtable(t);

     // advance to next subtable

     i += t->len() + 1; // +1 for header

   }

 }

 void ExceptionHandlerTable::print_subtable_for(int catch_pco) const {

   HandlerTableEntry* subtable = subtable_for(catch_pco);

   if( subtable != NULL ) { print_subtable( subtable ); }

 }

 // ----------------------------------------------------------------------------

 // Implicit null exception tables.  Maps an exception PC offset to a

 // continuation PC offset.  During construction it's a variable sized

 // array with a max size and current length.  When stored inside an

 // nmethod a zero length table takes no space.  This is detected by

 // nul_chk_table_size() == 0.  Otherwise the table has a length word

 // followed by pairs of <excp-offset, const-offset>.

 void ImplicitExceptionTable::set_size( uint size ) {

   _size = size;

   _data = NEW_RESOURCE_ARRAY(implicit_null_entry, (size*2));

   _len = 0;

 }

 void ImplicitExceptionTable::append( uint exec_off, uint cont_off ) {

   assert( (sizeof(implicit_null_entry) >= 4) || (exec_off < 65535), "" );

   assert( (sizeof(implicit_null_entry) >= 4) || (cont_off < 65535), "" );

   uint l = len();

   if (l == _size) {

     uint old_size_in_elements = _size*2;

     if (_size == 0) _size = 4;

     _size *= 2;

     uint new_size_in_elements = _size*2;

     _data = REALLOC_RESOURCE_ARRAY(uint, _data, old_size_in_elements, new_size_in_elements);

   }

   *(adr(l)  ) = exec_off;

   *(adr(l)+1) = cont_off;

   _len = l+1;

 };

 uint ImplicitExceptionTable::at( uint exec_off ) const {

   uint l = len();

   for( uint i=0; i<l; i++ )

     if( *adr(i) == exec_off )

       return *(adr(i)+1);

   return 0;                     // Failed to find any execption offset

 }

 void ImplicitExceptionTable::print(address base) const {

   tty->print("{");

   for( uint i=0; i<len(); i++ )

     tty->print("< "INTPTR_FORMAT", "INTPTR_FORMAT" > ",base + *adr(i), base + *(adr(i)+1));

   tty->print_cr("}");

 }

 ImplicitExceptionTable::ImplicitExceptionTable(const nmethod* nm) {

   if (nm->nul_chk_table_size() == 0) {

     _len = 0;

     _data = NULL;

   } else {

     // the first word is the length if non-zero, so read it out and

     // skip to the next word to get the table.

     _data  = (implicit_null_entry*)nm->nul_chk_table_begin();

     _len = _data[0];

     _data++;

   }

   _size = len();

   assert(size_in_bytes() <= nm->nul_chk_table_size(), "size of space allocated in nmethod incorrect");

 }

 void ImplicitExceptionTable::copy_to( nmethod* nm ) {

   assert(size_in_bytes() <= nm->nul_chk_table_size(), "size of space allocated in nmethod incorrect");

   if (len() != 0) {

     implicit_null_entry* nmdata = (implicit_null_entry*)nm->nul_chk_table_begin();

     // store the length in the first uint

     nmdata[0] = _len;

     nmdata++;

     // copy the table after the length

     memmove( nmdata, _data, 2 * len() * sizeof(implicit_null_entry));

   } else {

     // zero length table takes zero bytes

     assert(size_in_bytes() == 0, "bad size");

     assert(nm->nul_chk_table_size() == 0, "bad size");

   }

 }

 void ImplicitExceptionTable::verify(nmethod *nm) const {

   for (uint i = 0; i < len(); i++) {

      if ((*adr(i) > (unsigned int)nm->insts_size()) ||

          (*(adr(i)+1) > (unsigned int)nm->insts_size()))

        fatal(err_msg("Invalid offset in ImplicitExceptionTable at " PTR_FORMAT, _data));

   }

 }