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Diffstat (limited to 'src/analysis/scan/exprs/intersect.c')
-rw-r--r-- | src/analysis/scan/exprs/intersect.c | 290 |
1 files changed, 290 insertions, 0 deletions
diff --git a/src/analysis/scan/exprs/intersect.c b/src/analysis/scan/exprs/intersect.c new file mode 100644 index 0000000..f0660e0 --- /dev/null +++ b/src/analysis/scan/exprs/intersect.c @@ -0,0 +1,290 @@ + +/* Chrysalide - Outil d'analyse de fichiers binaires + * intersect.c - intersection d'ensembles aux types indentiques + * + * Copyright (C) 2023 Cyrille Bagard + * + * This file is part of Chrysalide. + * + * Chrysalide is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 3 of the License, or + * (at your option) any later version. + * + * Chrysalide 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 for more details. + * + * You should have received a copy of the GNU General Public License + * along with Foobar. If not, see <http://www.gnu.org/licenses/>. + */ + + +#include "intersect.h" + + +#include <assert.h> + + +#include "intersect-int.h" +#include "literal.h" + + + +/* --------------------- INTRODUCTION D'UNE NOUVELLE EXPRESSION --------------------- */ + + +/* Initialise la classe des intersections entre deux ensembles. */ +static void g_scan_sets_intersection_class_init(GScanSetsIntersectionClass *); + +/* Initialise une instance d'intersection entre deux ensembles. */ +static void g_scan_sets_intersection_init(GScanSetsIntersection *); + +/* Supprime toutes les références externes. */ +static void g_scan_sets_intersection_dispose(GScanSetsIntersection *); + +/* Procède à la libération totale de la mémoire. */ +static void g_scan_sets_intersection_finalize(GScanSetsIntersection *); + + + +/* --------------------- IMPLEMENTATION DES FONCTIONS DE CLASSE --------------------- */ + + +/* Réduit une expression à une forme plus simple. */ +static ScanReductionState g_scan_sets_intersection_reduce(GScanSetsIntersection *, GScanContext *, GScanScope *, GScanExpression **); + + + +/* ---------------------------------------------------------------------------------- */ +/* INTRODUCTION D'UNE NOUVELLE EXPRESSION */ +/* ---------------------------------------------------------------------------------- */ + + +/* Indique le type défini pour une intersection entre deux ensembles. */ +G_DEFINE_TYPE(GScanSetsIntersection, g_scan_sets_intersection, G_TYPE_SCAN_EXPRESSION); + + +/****************************************************************************** +* * +* Paramètres : klass = classe à initialiser. * +* * +* Description : Initialise la classe des intersections entre deux ensembles. * +* * +* Retour : - * +* * +* Remarques : - * +* * +******************************************************************************/ + +static void g_scan_sets_intersection_class_init(GScanSetsIntersectionClass *klass) +{ + GObjectClass *object; /* Autre version de la classe */ + GScanExpressionClass *expr; /* Version de classe parente */ + + object = G_OBJECT_CLASS(klass); + + object->dispose = (GObjectFinalizeFunc/* ! */)g_scan_sets_intersection_dispose; + object->finalize = (GObjectFinalizeFunc)g_scan_sets_intersection_finalize; + + expr = G_SCAN_EXPRESSION_CLASS(klass); + + expr->reduce = (reduce_expr_fc)g_scan_sets_intersection_reduce; + +} + + +/****************************************************************************** +* * +* Paramètres : op = instance à initialiser. * +* * +* Description : Initialise une instance d'intersection entre deux ensembles. * +* * +* Retour : - * +* * +* Remarques : - * +* * +******************************************************************************/ + +static void g_scan_sets_intersection_init(GScanSetsIntersection *inter) +{ + inter->first = NULL; + inter->second = NULL; + +} + + +/****************************************************************************** +* * +* Paramètres : inter = instance d'objet GLib à traiter. * +* * +* Description : Supprime toutes les références externes. * +* * +* Retour : - * +* * +* Remarques : - * +* * +******************************************************************************/ + +static void g_scan_sets_intersection_dispose(GScanSetsIntersection *inter) +{ + g_clear_object(&inter->first); + g_clear_object(&inter->second); + + G_OBJECT_CLASS(g_scan_sets_intersection_parent_class)->dispose(G_OBJECT(inter)); + +} + + +/****************************************************************************** +* * +* Paramètres : inter = instance d'objet GLib à traiter. * +* * +* Description : Procède à la libération totale de la mémoire. * +* * +* Retour : - * +* * +* Remarques : - * +* * +******************************************************************************/ + +static void g_scan_sets_intersection_finalize(GScanSetsIntersection *inter) +{ + G_OBJECT_CLASS(g_scan_sets_intersection_parent_class)->finalize(G_OBJECT(inter)); + +} + + +/****************************************************************************** +* * +* Paramètres : type = type d'opération booléenne à représenter. * +* first = premier élément concerné. * +* second = second élément concerné. * +* * +* Description : Organise une intersection entre deux ensembles. * +* * +* Retour : Expression mise en place. * +* * +* Remarques : - * +* * +******************************************************************************/ + +GScanExpression *g_scan_sets_intersection_new(GScanExpression *first, GScanExpression *second) +{ + GScanExpression *result; /* Structure à retourner */ + + result = g_object_new(G_TYPE_SCAN_SETS_INTERSECTION, NULL); + + if (!g_scan_sets_intersection_create(G_SCAN_SETS_INTERSECTION(result), first, second)) + g_clear_object(&result); + + return result; + +} + + +/****************************************************************************** +* * +* Paramètres : inter = instance à initialiser pleinement. * +* first = premier élément concerné. * +* second = second élément concerné. * +* * +* Description : Met en place une expression d'opération booléenne. * +* * +* Retour : Bilan de l'opération. * +* * +* Remarques : - * +* * +******************************************************************************/ + +bool g_scan_sets_intersection_create(GScanSetsIntersection *inter, GScanExpression *first, GScanExpression *second) +{ + bool result; /* Bilan à retourner */ + + result = true; + + inter->first = first; + g_object_ref(G_OBJECT(first)); + + inter->second = second; + g_object_ref(G_OBJECT(second)); + + return result; + +} + + + +/* ---------------------------------------------------------------------------------- */ +/* IMPLEMENTATION DES FONCTIONS DE CLASSE */ +/* ---------------------------------------------------------------------------------- */ + + +/****************************************************************************** +* * +* Paramètres : expr = expression à consulter. * +* ctx = contexte de suivi de l'analyse courante. * +* scope = portée courante des variables locales. * +* out = zone d'enregistrement de la réduction opérée. [OUT] * +* * +* Description : Réduit une expression à une forme plus simple. * +* * +* Retour : Bilan de l'opération : false en cas d'erreur irrécupérable. * +* * +* Remarques : - * +* * +******************************************************************************/ + +static ScanReductionState g_scan_sets_intersection_reduce(GScanSetsIntersection *expr, GScanContext *ctx, GScanScope *scope, GScanExpression **out) +{ + ScanReductionState result; /* Etat synthétisé à retourner */ + GScanExpression *new_first; /* Nouvelle réduction #1 */ + GScanExpression *new_second; /* Nouvelle réduction #2 */ + ScanReductionState state_first; /* Etat synthétisé #1 */ + ScanReductionState state_second; /* Etat synthétisé #2 */ + + new_first = NULL; + new_second = NULL; + + state_first = g_scan_expression_reduce(expr->first, ctx, scope, &new_first); + if (state_first == SRS_UNRESOLVABLE) + { + result = SRS_UNRESOLVABLE; + goto exit; + } + + state_second = g_scan_expression_reduce(expr->second, ctx, scope, &new_second); + if (state_second == SRS_UNRESOLVABLE) + { + result = SRS_UNRESOLVABLE; + goto exit; + } + + if (state_first == SRS_WAIT_FOR_SCAN || state_second == SRS_WAIT_FOR_SCAN) + { + if (new_first != expr->first || new_second != expr->second) + *out = g_scan_sets_intersection_new(new_first, new_second); + + result = SRS_WAIT_FOR_SCAN; + + } + + else + { + assert(state_first == SRS_REDUCED && state_second == SRS_REDUCED); + + *out = g_scan_expression_intersect(new_first, new_second, ctx, scope); + + result = (*out != NULL ? SRS_REDUCED : SRS_UNRESOLVABLE); + + } + + exit: + + g_clear_object(&new_first); + g_clear_object(&new_second); + + return result; + +} |