jdk8-mips64-public/hotspot: comparison src/share/vm/code/exceptionHandlerTable.cpp

--1:000000000000
+:f90c822e73f8
+/*
+* Copyright (c) 1998, 2014, 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"
+PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
+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));
+}
+}

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

comparison: src/share/vm/code/exceptionHandlerTable.cpp

src/share/vm/code/exceptionHandlerTable.cpp