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Diffstat (limited to 'src/analysis/scan/exprs/arithmetic.c')
| -rw-r--r-- | src/analysis/scan/exprs/arithmetic.c | 641 |
1 files changed, 641 insertions, 0 deletions
diff --git a/src/analysis/scan/exprs/arithmetic.c b/src/analysis/scan/exprs/arithmetic.c new file mode 100644 index 0000000..06cfc48 --- /dev/null +++ b/src/analysis/scan/exprs/arithmetic.c @@ -0,0 +1,641 @@ + +/* Chrysalide - Outil d'analyse de fichiers binaires + * arithmetic.c - gestion des opérations arithmétiques + * + * 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 "arithmetic.h" + + +#include <assert.h> + + +#include "arithmetic-int.h" +#include "literal.h" + + + +/* --------------------- INTRODUCTION D'UNE NOUVELLE EXPRESSION --------------------- */ + + +/* Initialise la classe des opérations arithmétiques. */ +static void g_scan_arithmetic_operation_class_init(GScanArithmeticOperationClass *); + +/* Initialise une instance d'opération arithmétique. */ +static void g_scan_arithmetic_operation_init(GScanArithmeticOperation *); + +/* Supprime toutes les références externes. */ +static void g_scan_arithmetic_operation_dispose(GScanArithmeticOperation *); + +/* Procède à la libération totale de la mémoire. */ +static void g_scan_arithmetic_operation_finalize(GScanArithmeticOperation *); + + + +/* --------------------- IMPLEMENTATION DES FONCTIONS DE CLASSE --------------------- */ + + +/* Réalise une comparaison entre objets selon un critère précis. */ +static bool g_scan_arithmetic_operation_compare_rich(const GScanArithmeticOperation *, const GScanArithmeticOperation *, RichCmpOperation, bool *); + +/* Réduit une expression à une forme plus simple. */ +static ScanReductionState g_scan_arithmetic_operation_reduce(const GScanArithmeticOperation *, GScanContext *, GScanScope *, GScanExpression **); + + + +/* ---------------------------------------------------------------------------------- */ +/* INTRODUCTION D'UNE NOUVELLE EXPRESSION */ +/* ---------------------------------------------------------------------------------- */ + + +/* Indique le type défini pour une opération de relation entre expressions. */ +G_DEFINE_TYPE(GScanArithmeticOperation, g_scan_arithmetic_operation, G_TYPE_SCAN_EXPRESSION); + + +/****************************************************************************** +* * +* Paramètres : klass = classe à initialiser. * +* * +* Description : Initialise la classe des opérations arithmétiques. * +* * +* Retour : - * +* * +* Remarques : - * +* * +******************************************************************************/ + +static void g_scan_arithmetic_operation_class_init(GScanArithmeticOperationClass *klass) +{ + GObjectClass *object; /* Autre version de la classe */ + GScanExpressionClass *expr; /* Version de classe parente */ + + object = G_OBJECT_CLASS(klass); + + object->dispose = (GObjectFinalizeFunc/* ! */)g_scan_arithmetic_operation_dispose; + object->finalize = (GObjectFinalizeFunc)g_scan_arithmetic_operation_finalize; + + expr = G_SCAN_EXPRESSION_CLASS(klass); + + expr->cmp_rich = (compare_expr_rich_fc)g_scan_arithmetic_operation_compare_rich; + expr->reduce = (reduce_expr_fc)g_scan_arithmetic_operation_reduce; + +} + + +/****************************************************************************** +* * +* Paramètres : op = instance à initialiser. * +* * +* Description : Initialise une instance d'opération arithmétique. * +* * +* Retour : - * +* * +* Remarques : - * +* * +******************************************************************************/ + +static void g_scan_arithmetic_operation_init(GScanArithmeticOperation *op) +{ + op->left = NULL; + op->right = NULL; + +} + + +/****************************************************************************** +* * +* Paramètres : op = instance d'objet GLib à traiter. * +* * +* Description : Supprime toutes les références externes. * +* * +* Retour : - * +* * +* Remarques : - * +* * +******************************************************************************/ + +static void g_scan_arithmetic_operation_dispose(GScanArithmeticOperation *op) +{ + g_clear_object(&op->left); + g_clear_object(&op->right); + + G_OBJECT_CLASS(g_scan_arithmetic_operation_parent_class)->dispose(G_OBJECT(op)); + +} + + +/****************************************************************************** +* * +* Paramètres : op = instance d'objet GLib à traiter. * +* * +* Description : Procède à la libération totale de la mémoire. * +* * +* Retour : - * +* * +* Remarques : - * +* * +******************************************************************************/ + +static void g_scan_arithmetic_operation_finalize(GScanArithmeticOperation *op) +{ + G_OBJECT_CLASS(g_scan_arithmetic_operation_parent_class)->finalize(G_OBJECT(op)); + +} + + +/****************************************************************************** +* * +* Paramètres : operator = type d'opération arithmétique à représenter. * +* left = premier opérande concerné. * +* right = éventuel second opérande impliqué ou NULL. * +* * +* Description : Organise une opération arithmétique entre expressions. * +* * +* Retour : Fonction mise en place. * +* * +* Remarques : - * +* * +******************************************************************************/ + +GScanExpression *g_scan_arithmetic_operation_new(ArithmeticExpressionOperator operator, GScanExpression *left, GScanExpression *right) +{ + GScanExpression *result; /* Structure à retourner */ + + result = g_object_new(G_TYPE_SCAN_ARITHMETIC_OPERATION, NULL); + + if (!g_scan_arithmetic_operation_create(G_SCAN_ARITHMETIC_OPERATION(result), operator, left, right)) + g_clear_object(&result); + + return result; + +} + + +/****************************************************************************** +* * +* Paramètres : op = instance à initialiser pleinement. * +* operator = type d'opération booléenne à représenter. * +* left = premier opérande concerné. * +* right = éventuel second opérande impliqué ou NULL. * +* * +* Description : Met en place une opération arithmétique entre expressions. * +* * +* Retour : Bilan de l'opération. * +* * +* Remarques : - * +* * +******************************************************************************/ + +bool g_scan_arithmetic_operation_create(GScanArithmeticOperation *op, ArithmeticExpressionOperator operator, GScanExpression *left, GScanExpression *right) +{ + bool result; /* Bilan à retourner */ + + result = g_scan_expression_create(G_SCAN_EXPRESSION(op), SRS_PENDING); + if (!result) goto exit; + + op->operator = operator; + + op->left = left; + g_object_ref(G_OBJECT(op->left)); + + op->right = right; + g_object_ref(G_OBJECT(op->right)); + + exit: + + return result; + +} + + + +/* ---------------------------------------------------------------------------------- */ +/* IMPLEMENTATION DES FONCTIONS DE CLASSE */ +/* ---------------------------------------------------------------------------------- */ + + +/****************************************************************************** +* * +* Paramètres : item = premier objet à consulter pour une comparaison. * +* other = second objet à consulter pour une comparaison. * +* op = opération de comparaison à réaliser. * +* status = bilan des opérations de comparaison. [OUT] * +* * +* Description : Réalise une comparaison entre objets selon un critère précis.* +* * +* Retour : true si la comparaison a pu être effectuée, false sinon. * +* * +* Remarques : - * +* * +******************************************************************************/ + +static bool g_scan_arithmetic_operation_compare_rich(const GScanArithmeticOperation *item, const GScanArithmeticOperation *other, RichCmpOperation op, bool *status) +{ + bool result; /* Etat à retourner */ + + result = g_type_is_a(G_TYPE_FROM_INSTANCE(other), G_TYPE_SCAN_ARITHMETIC_OPERATION); + if (!result) goto done; + + if (item->operator != other->operator) + { + result = compare_rich_integer_values_unsigned(item->operator, other->operator, op); + goto done; + } + + result = g_comparable_item_compare_rich(G_COMPARABLE_ITEM(item), G_COMPARABLE_ITEM(other), RCO_EQ, status); + if (!result || STATUS_NOT_EQUAL(*status, op)) goto done; + + result = g_comparable_item_compare_rich(G_COMPARABLE_ITEM(item->left), + G_COMPARABLE_ITEM(other->left), + op, status); + if (!result || STATUS_NOT_EQUAL(*status, op)) goto done; + + result = g_comparable_item_compare_rich(G_COMPARABLE_ITEM(item->right), + G_COMPARABLE_ITEM(other->right), + op, status); + + done: + + return result; + +} + + +/****************************************************************************** +* * +* 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_arithmetic_operation_reduce(const GScanArithmeticOperation *expr, GScanContext *ctx, GScanScope *scope, GScanExpression **out) +{ + ScanReductionState result; /* Etat synthétisé à retourner */ + GScanExpression *new_left; /* Expression réduite (gauche) */ + GScanExpression *new_right; /* Expression réduite (droite) */ + ScanReductionState state_left; /* Etat synthétisé #1 */ + ScanReductionState state_right; /* Etat synthétisé #2 */ + GScanLiteralExpression *op_left; /* Opérande gauche final */ + GScanLiteralExpression *op_right; /* Opérande droite final */ + LiteralValueType vtype_left; /* Type de valeur portée #1 */ + LiteralValueType vtype_right; /* Type de valeur portée #2 */ + long long val_1_s; /* Première valeur à traiter */ + unsigned long long val_1_u; /* Première valeur à traiter */ + long long val_2_s; /* Seconde valeur à traiter */ + unsigned long long val_2_u; /* Seconde valeur à traiter */ + LiteralValueType state_final; /* Nature de la valeur finale */ + long long reduced_s; /* Valeur réduite finale */ + unsigned long long reduced_u; /* Valeur réduite finale */ + + /* Réduction des éléments considérés */ + + new_left = NULL; + new_right = NULL; + + state_left = g_scan_expression_reduce(expr->left, ctx, scope, &new_left); + if (state_left == SRS_UNRESOLVABLE) + { + result = SRS_UNRESOLVABLE; + goto exit; + } + + state_right = g_scan_expression_reduce(expr->right, ctx, scope, &new_right); + if (state_right == SRS_UNRESOLVABLE) + { + result = SRS_UNRESOLVABLE; + goto exit; + } + + /* Construction d'une réduction locale ? */ + + if (G_IS_SCAN_LITERAL_EXPRESSION(new_left) && G_IS_SCAN_LITERAL_EXPRESSION(new_right)) + { + /* Récupération de l'opérande de gauche */ + + op_left = G_SCAN_LITERAL_EXPRESSION(new_left); + vtype_left = g_scan_literal_expression_get_value_type(op_left); + + if (vtype_left == LVT_SIGNED_INTEGER) + { + if (!g_scan_literal_expression_get_signed_integer_value(op_left, &val_1_s)) + { + result = SRS_UNRESOLVABLE; + goto exit; + } + } + else if (vtype_left == LVT_UNSIGNED_INTEGER) + { + if (!g_scan_literal_expression_get_unsigned_integer_value(op_left, &val_1_u)) + { + result = SRS_UNRESOLVABLE; + goto exit; + } + } + else + { + result = SRS_UNRESOLVABLE; + goto exit; + } + + /* Récupération de l'opérande de droite */ + + op_right = G_SCAN_LITERAL_EXPRESSION(new_right); + vtype_right = g_scan_literal_expression_get_value_type(op_right); + + if (vtype_right == LVT_SIGNED_INTEGER) + { + if (!g_scan_literal_expression_get_signed_integer_value(op_right, &val_2_s)) + { + result = SRS_UNRESOLVABLE; + goto exit; + } + } + else if (vtype_right == LVT_UNSIGNED_INTEGER) + { + if (!g_scan_literal_expression_get_unsigned_integer_value(op_right, &val_2_u)) + { + result = SRS_UNRESOLVABLE; + goto exit; + } + } + else + { + result = SRS_UNRESOLVABLE; + goto exit; + } + + /* Partie des calculs */ + + result = SRS_REDUCED; + + switch (expr->operator) + { + case AEO_PLUS: + if (vtype_left == LVT_SIGNED_INTEGER) + { + if (vtype_right == LVT_SIGNED_INTEGER) + { + state_final = LVT_SIGNED_INTEGER; + reduced_s = val_1_s + val_2_s; + } + else + { + assert(vtype_right == LVT_UNSIGNED_INTEGER); + + if ((long long)val_2_u > val_1_s) + { + state_final = LVT_UNSIGNED_INTEGER; + reduced_u = val_1_s + (long long)val_2_u; + } + else + { + state_final = LVT_SIGNED_INTEGER; + reduced_s = val_1_s + (long long)val_2_u; + } + + } + } + else + { + assert(vtype_left == LVT_UNSIGNED_INTEGER); + + if (vtype_right == LVT_SIGNED_INTEGER) + { + if ((long long)val_1_u > val_2_s) + { + state_final = LVT_UNSIGNED_INTEGER; + reduced_u = (long long)val_1_u + val_2_s; + } + else + { + state_final = LVT_SIGNED_INTEGER; + reduced_s = (long long)val_1_u + val_2_s; + } + + } + else + { + assert(vtype_right == LVT_UNSIGNED_INTEGER); + + state_final = LVT_UNSIGNED_INTEGER; + reduced_u = val_1_u + val_2_u; + + } + } + break; + + case AEO_MINUS: + if (vtype_left == LVT_SIGNED_INTEGER) + { + if (vtype_right == LVT_SIGNED_INTEGER) + { + if (val_2_s < val_1_s) + { + state_final = LVT_UNSIGNED_INTEGER; + reduced_u = val_1_s - val_2_s; + } + else + { + state_final = LVT_SIGNED_INTEGER; + reduced_s = val_1_s - val_2_s; + } + + } + else + { + assert(vtype_right == LVT_UNSIGNED_INTEGER); + + state_final = LVT_SIGNED_INTEGER; + reduced_s = val_1_s - (long long)val_2_u; + + } + } + else + { + assert(vtype_left == LVT_UNSIGNED_INTEGER); + + if (vtype_right == LVT_SIGNED_INTEGER) + { + state_final = LVT_UNSIGNED_INTEGER; + reduced_u = (long long)val_1_u - val_2_s; + } + else + { + assert(vtype_right == LVT_UNSIGNED_INTEGER); + + if (val_1_u > val_2_u) + { + state_final = LVT_UNSIGNED_INTEGER; + reduced_u = val_1_u - val_2_u; + } + else + { + state_final = LVT_SIGNED_INTEGER; + reduced_s = val_1_u - val_2_u; + } + + } + } + break; + + case AEO_MUL: + if (vtype_left == LVT_SIGNED_INTEGER) + { + if (vtype_right == LVT_SIGNED_INTEGER) + { + state_final = LVT_UNSIGNED_INTEGER; + reduced_u = val_1_s * val_2_s; + } + else + { + assert(vtype_right == LVT_UNSIGNED_INTEGER); + + state_final = LVT_SIGNED_INTEGER; + reduced_s = val_1_s * (long long)val_2_u; + + } + } + else + { + assert(vtype_left == LVT_UNSIGNED_INTEGER); + + if (vtype_right == LVT_SIGNED_INTEGER) + { + state_final = LVT_SIGNED_INTEGER; + reduced_s = (long long)val_1_u * val_2_s; + } + else + { + assert(vtype_right == LVT_UNSIGNED_INTEGER); + + state_final = LVT_UNSIGNED_INTEGER; + reduced_u = val_1_u * val_2_u; + + } + } + break; + + case AEO_DIV: + if ((vtype_right == LVT_SIGNED_INTEGER && val_2_s == 0) + || (vtype_right == LVT_UNSIGNED_INTEGER && val_2_u == 0)) + { + result = SRS_UNRESOLVABLE; + break; + } + + if (vtype_left == LVT_SIGNED_INTEGER) + { + if (vtype_right == LVT_SIGNED_INTEGER) + { + state_final = LVT_UNSIGNED_INTEGER; + reduced_u = val_1_s / val_2_s; + } + else + { + assert(vtype_right == LVT_UNSIGNED_INTEGER); + + state_final = LVT_SIGNED_INTEGER; + reduced_s = val_1_s / (long long)val_2_u; + + } + } + else + { + assert(vtype_left == LVT_UNSIGNED_INTEGER); + + if (vtype_right == LVT_SIGNED_INTEGER) + { + state_final = LVT_SIGNED_INTEGER; + reduced_s = (long long)val_1_u / val_2_s; + } + else + { + assert(vtype_right == LVT_UNSIGNED_INTEGER); + + state_final = LVT_UNSIGNED_INTEGER; + reduced_u = val_1_u / val_2_u; + + } + } + break; + + case AEO_MOD: + result = SRS_UNRESOLVABLE; + /* FIXME + result = (val_2 != 0); + if (result) + reduced = val_1 % val_2; + */ + break; + + } + + if (result == SRS_REDUCED) + { + if (state_final == LVT_SIGNED_INTEGER) + *out = g_scan_literal_expression_new(LVT_SIGNED_INTEGER, &reduced_s); + else + { + assert(state_final == LVT_UNSIGNED_INTEGER); + *out = g_scan_literal_expression_new(LVT_UNSIGNED_INTEGER, &reduced_u); + } + + } + + } + + /* Mise à jour de la progression ? */ + + else if (state_left == SRS_WAIT_FOR_SCAN || state_right == SRS_WAIT_FOR_SCAN) + { + if (new_left != expr->left || new_right != expr->right) + *out = g_scan_arithmetic_operation_new(expr->operator, new_left, new_right); + + result = SRS_WAIT_FOR_SCAN; + + } + + /* Cas des situations où les expressions ne sont pas exploitables (!) */ + else + { + assert(state_left == SRS_REDUCED && state_right == SRS_REDUCED); + + result = SRS_UNRESOLVABLE; + + } + + /* Sortie propre */ + + exit: + + g_clear_object(&new_left); + g_clear_object(&new_right); + + return result; + +} |