| [2835] | 1 | /* $Id: $ */
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| 2 | /** @file
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| 3 | *
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| 4 | * kLdr - The Dynamic Loader, Dyld module methods.
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| 5 | *
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| 6 | * Copyright (c) 2006 knut st. osmundsen <bird-kbuild-src@anduin.net>
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| 7 | *
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| 8 | *
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| 9 | * This file is part of kLdr.
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| 10 | *
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| 11 | * kLdr is free software; you can redistribute it and/or modify
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| 12 | * it under the terms of the GNU General Public License as published by
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| 13 | * the Free Software Foundation; either version 2 of the License, or
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| 14 | * (at your option) any later version.
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| 15 | *
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| 16 | * kLdr is distributed in the hope that it will be useful,
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| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 19 | * GNU General Public License for more details.
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| 20 | *
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| 21 | * You should have received a copy of the GNU General Public License
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| 22 | * along with kLdr; if not, write to the Free Software
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| 23 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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| 24 | *
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| 25 | */
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| 26 |
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| 27 |
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| 28 |
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| 29 | /*******************************************************************************
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| 30 | * Header Files *
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| 31 | *******************************************************************************/
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| 32 | #include <kLdr.h>
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| 33 | #include "kLdrInternal.h"
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| 34 | #include "kLdrHlp.h"
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| 35 |
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| 36 |
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| [2837] | 37 | /*******************************************************************************
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| 38 | * Defined Constants And Macros *
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| 39 | *******************************************************************************/
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| 40 | /** @def KLDRDYLDMOD_ASSERT
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| 41 | * Assert that an expression is true when KLDRDYLD_STRICT is defined.
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| 42 | */
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| 43 | #ifdef KLDRDYLD_STRICT
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| 44 | # define KLDRDYLDMOD_ASSERT(expr) kldrHlpAssert(expr)
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| 45 | #else
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| 46 | # define KLDRDYLDMOD_ASSERT(expr) do {} while (0)
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| 47 | #endif
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| [2835] | 48 |
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| 49 |
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| 50 |
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| [2837] | 51 |
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| 52 | void kldrDyldModUnloadPrerequisites(PKLDRDYLDMOD pMod)
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| 53 | {
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| 54 |
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| 55 | }
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| 56 |
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| 57 |
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| 58 | void kldrDyldModDeref(PKLDRDYLDMOD pMod)
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| 59 | {
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| 60 | /* validate input */
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| 61 | KLDRDYLDMOD_ASSERT(pMod->enmState > KLDRSTATE_INVALID && pMod->enmState < KLDRSTATE_END);
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| 62 | KLDRDYLDMOD_ASSERT(pMod->cRefs > 0);
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| 63 | KLDRDYLDMOD_ASSERT(pMod->cRefs >= pMod->cDepRefs + pMod->cDynRefs);
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| 64 |
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| 65 | /* decrement. */
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| 66 | if (pMod->cRefs > 0)
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| 67 | pMod->cRefs--;
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| 68 |
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| 69 | /*
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| 70 | * Drop prerequisites for stats that implies that no recursion can have taken place yet.
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| 71 | * This ASSUMES that we're only dereferencing modules when an operation completes.
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| 72 | * (This is *required* for the reloaded state.)
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| 73 | */
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| 74 | switch (pMod->enmState)
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| 75 | {
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| 76 | case KLDRSTATE_MAPPED:
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| 77 | case KLDRSTATE_LOADED_PREREQUISITES:
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| 78 | case KLDRSTATE_FIXED_UP:
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| 79 | case KLDRSTATE_RELOADED:
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| 80 | kldrDyldModUnloadPrerequisites(pMod);
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| 81 | pMod->enmState = KLDRSTATE_PENDING_GC;
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| 82 | break;
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| 83 |
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| 84 | case KLDRSTATE_PENDING_INITIALIZATION:
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| 85 | case KLDRSTATE_INITIALIZING:
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| 86 | case KLDRSTATE_GOOD:
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| 87 | case KLDRSTATE_PENDING_TERMINATION:
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| 88 | case KLDRSTATE_TERMINATING:
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| 89 | case KLDRSTATE_PENDING_GC:
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| 90 | case KLDRSTATE_GC:
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| 91 | case KLDRSTATE_PENDING_DESTROY:
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| 92 | break;
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| 93 |
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| 94 | default:
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| 95 | KLDRDYLDMOD_ASSERT(!"Invalid deref state");
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| 96 | break;
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| 97 | }
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| 98 |
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| 99 | /*
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| 100 | * Also drop prerequisites if noone is referencing the module.
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| 101 | */
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| 102 | if (!pMod->cDepRefs && !pMod->cDynRefs)
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| 103 | {
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| 104 | switch (pMod->enmState)
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| 105 | {
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| 106 | case KLDRSTATE_MAPPED:
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| 107 | case KLDRSTATE_LOADED_PREREQUISITES:
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| 108 | case KLDRSTATE_FIXED_UP:
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| 109 | case KLDRSTATE_RELOADED:
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| 110 | /* already dropped. */
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| 111 | break;
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| 112 |
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| 113 | case KLDRSTATE_PENDING_INITIALIZATION:
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| 114 | kldrDyldModUnloadPrerequisites(pMod);
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| 115 | pMod->enmState = KLDRSTATE_PENDING_GC;
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| 116 | break;
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| 117 |
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| 118 | case KLDRSTATE_GOOD:
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| 119 | pMod->enmState = KLDRSTATE_PENDING_TERMINATION;
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| 120 | case KLDRSTATE_PENDING_TERMINATION:
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| 121 | case KLDRSTATE_PENDING_GC:
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| 122 | kldrDyldModUnloadPrerequisites(pMod);
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| 123 | break;
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| 124 |
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| 125 | case KLDRSTATE_TERMINATING:
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| 126 | case KLDRSTATE_GC:
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| 127 | case KLDRSTATE_PENDING_DESTROY:
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| 128 | break;
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| 129 |
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| 130 | default:
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| 131 | KLDRDYLDMOD_ASSERT(!"Invalid deref state (b)");
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| 132 | break;
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| 133 | }
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| 134 | }
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| 135 |
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| 136 | /*
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| 137 | * If there are no references whatsoever now and the module
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| 138 | * is pending destruction, destroy it.
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| 139 | */
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| 140 | if ( !pMod->cRefs
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| 141 | && ( pMod->enmState == KLDRSTATE_PENDING_DESTROY
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| 142 | || pMod->enmState == KLDRSTATE_GC))
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| 143 | kldrDyldModDestroy(pMod);
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| 144 | }
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