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1 /*
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2 * Copyright 1999-2006 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 #include "incls/_precompiled.incl"
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26 #include "incls/_chaitin_windows.cpp.incl"
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27
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28 // Disallow the use of the frame pointer (EBP) for implicit null exceptions
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29 // on win95/98. If we do not do this, the OS gets confused and gives a stack
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30 // error.
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31 void PhaseRegAlloc::pd_preallocate_hook() {
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32 #ifndef _WIN64
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33 if (ImplicitNullChecks && !os::win32::is_nt()) {
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34 for (uint block_num=1; block_num<_cfg._num_blocks; block_num++) {
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35 Block *block = _cfg._blocks[block_num];
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36
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37 Node *block_end = block->end();
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38 if (block_end->is_MachNullCheck() &&
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39 block_end->as_Mach()->ideal_Opcode() != Op_Con) {
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40 // The last instruction in the block is an implicit null check.
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41 // Fix its input so that it does not load into the frame pointer.
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42 _matcher.pd_implicit_null_fixup(block_end->in(1)->as_Mach(),
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43 block_end->as_MachNullCheck()->_vidx);
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44 }
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45 }
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46 }
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47 #else
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48 // WIN64==itanium on XP
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49 #endif
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50 }
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51
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52 #ifdef ASSERT
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53 // Verify that no implicit null check uses the frame pointer (EBP) as
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54 // its register on win95/98. Use of the frame pointer in an implicit
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55 // null check confuses the OS, yielding a stack error.
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56 void PhaseRegAlloc::pd_postallocate_verify_hook() {
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57 #ifndef _WIN64
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58 if (ImplicitNullChecks && !os::win32::is_nt()) {
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59 for (uint block_num=1; block_num<_cfg._num_blocks; block_num++) {
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60 Block *block = _cfg._blocks[block_num];
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61
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62 Node *block_end = block->_nodes[block->_nodes.size()-1];
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63 if (block_end->is_MachNullCheck() && block_end->as_Mach()->ideal_Opcode() != Op_Con) {
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64 // The last instruction in the block is an implicit
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65 // null check. Verify that this instruction does not
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66 // use the frame pointer.
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67 int reg = get_reg_first(block_end->in(1)->in(block_end->as_MachNullCheck()->_vidx));
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68 assert(reg != EBP_num,
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69 "implicit null check using frame pointer on win95/98");
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70 }
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71 }
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72 }
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73 #else
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74 // WIN64==itanium on XP
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75 #endif
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76 }
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77 #endif
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