new file mode 100644
@@ -0,0 +1,1136 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2023 Patrick Franz <deltaone@debian.org>
+ */
+
+#define _GNU_SOURCE
+#include <assert.h>
+#include <locale.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+
+#include <xalloc.h>
+
+#include "lkc.h"
+#include "cf_defs.h"
+#include "cf_expr.h"
+#include "list.h"
+#include "list_types.h"
+#include "cf_fixgen.h"
+#include "internal.h"
+#include "cf_utils.h"
+#include "cf_defs.h"
+
+#define MAX_DIAGNOSES 3
+#define MAX_SECONDS 120
+#define PRINT_UNSAT_CORE true
+#define PRINT_DIAGNOSES false
+#define PRINT_DIAGNOSIS_FOUND true
+#define MINIMISE_DIAGNOSES false
+#define MINIMISE_UNSAT_CORE true
+
+static struct sfl_list *diagnoses_symbol;
+
+static struct fexl_list *generate_diagnoses(PicoSAT *pico, struct cfdata *data);
+
+static void add_fexpr_to_constraint_set(struct fexpr_list *C,
+ struct cfdata *data);
+static void set_assumptions(PicoSAT *pico, struct fexpr_list *c,
+ struct cfdata *data);
+static void fexpr_add_assumption(PicoSAT *pico, struct fexpr *e, int satval);
+static struct fexpr_list *get_unsat_core_soft(PicoSAT *pico,
+ struct cfdata *data);
+static void minimise_unsat_core(PicoSAT *pico, struct fexpr_list *C,
+ struct cfdata *data);
+
+static struct fexpr_list *get_difference(struct fexpr_list *C,
+ struct fexpr_list *E0);
+static bool has_intersection(struct fexpr_list *e, struct fexpr_list *X);
+static struct fexpr_list *fexpr_list_union(struct fexpr_list *A,
+ struct fexpr_list *B);
+static struct fexl_list *fexl_list_union(struct fexl_list *A,
+ struct fexl_list *B);
+static bool is_subset_of(struct fexpr_list *A, struct fexpr_list *B);
+static void print_unsat_core(struct fexpr_list *list);
+static bool diagnosis_contains_fexpr(struct fexpr_list *diagnosis,
+ struct fexpr *e);
+static bool diagnosis_contains_symbol(struct sfix_list *diagnosis,
+ struct symbol *sym);
+
+static void print_diagnoses(struct fexl_list *diag);
+static void print_diagnoses_symbol(struct sfl_list *diag_sym);
+
+static struct sfl_list *convert_diagnoses(struct fexl_list *diagnoses,
+ struct cfdata *data);
+static struct sfix_list *convert_diagnosis(struct fexpr_list *diagnosis,
+ struct cfdata *data);
+static struct symbol_fix *symbol_fix_create(struct fexpr *e,
+ enum symbolfix_type type,
+ struct fexpr_list *diagnosis);
+static struct sfl_list *minimise_diagnoses(PicoSAT *pico,
+ struct fexl_list *diagnoses,
+ struct cfdata *data);
+
+static tristate calculate_new_tri_val(struct fexpr *e,
+ struct fexpr_list *diagnosis);
+static const char *calculate_new_string_value(struct fexpr *e,
+ struct fexpr_list *diagnosis);
+static bool fexpr_list_has_length_1(struct fexpr_list *list);
+
+/* count assumptions, only used for debugging */
+static unsigned int nr_of_assumptions = 0, nr_of_assumptions_true;
+
+/* -------------------------------------- */
+
+struct sfl_list *fixgen_run(PicoSAT *pico, struct cfdata *data)
+{
+ clock_t start, end;
+ double time;
+ struct fexl_list *diagnoses;
+ struct fexl_node *node;
+
+ printd("Starting fix generation...\n");
+ printd("Generating diagnoses...");
+
+ /* generate the diagnoses */
+ start = clock();
+ diagnoses = generate_diagnoses(pico, data);
+ end = clock();
+
+ time = ((double) (end - start)) / CLOCKS_PER_SEC;
+ printd("Generating diagnoses...done. (%.6f secs.)\n", time);
+
+ if (PRINT_DIAGNOSES) {
+ printd("Diagnoses (only for debugging):\n");
+ print_diagnoses(diagnoses);
+ printd("\n");
+ }
+
+ /* convert diagnoses of fexpr to diagnoses of symbols */
+ if (MINIMISE_DIAGNOSES)
+ diagnoses_symbol = minimise_diagnoses(pico, diagnoses, data);
+ else
+ diagnoses_symbol = convert_diagnoses(diagnoses, data);
+
+ printd("\n");
+
+ CF_LIST_FOR_EACH(node, diagnoses, fexl)
+ CF_LIST_FREE(node->elem, fexpr);
+ CF_LIST_FREE(diagnoses, fexl);
+
+ return diagnoses_symbol;
+}
+
+/*
+ * generate the diagnoses
+ */
+static struct fexl_list *generate_diagnoses(PicoSAT *pico, struct cfdata *data)
+{
+ CF_DEF_LIST(C, fexpr);
+ CF_DEF_LIST(empty_diagnosis, fexpr);
+ CF_DEF_LIST(E, fexl);
+ CF_DEF_LIST(R, fexl);
+ size_t num_diagnoses = 0;
+ struct fexpr_list *X, *e, *E2;
+ struct fexl_list *E_R_Union;
+ clock_t start_t, end_t;
+ double time_t;
+
+ /* create constraint set C */
+ add_fexpr_to_constraint_set(C, data);
+
+ if (PRINT_UNSAT_CORE)
+ printd("\n");
+
+ /* init E with an empty diagnosis */
+ CF_PUSH_BACK(E, empty_diagnosis, fexl);
+
+ /* start the clock */
+ start_t = clock();
+
+ while (!list_empty(&E->list)) {
+ /* get random diagnosis */
+ struct fexl_node *E0_node =
+ list_first_entry(&E->list, struct fexl_node, node);
+ struct fexpr_list *E0 = E0_node->elem;
+
+ /* calculate C\E0 */
+ struct fexpr_list *c = get_difference(C, E0);
+
+ struct fexl_node *node, *next;
+ int res;
+
+ /* set assumptions */
+ nr_of_assumptions = 0;
+ nr_of_assumptions_true = 0;
+ set_assumptions(pico, c, data);
+ CF_LIST_FREE(c, fexpr);
+
+ res = picosat_sat(pico, -1);
+
+ if (res == PICOSAT_SATISFIABLE) {
+ if (PRINT_DIAGNOSIS_FOUND && CFDEBUG)
+ fexpr_list_print("DIAGNOSIS FOUND", E0);
+
+ list_del(&E0_node->node);
+ if (!list_empty(&E0->list)) {
+ CF_PUSH_BACK(R, E0, fexl);
+ ++num_diagnoses;
+ } else
+ CF_LIST_FREE(E0, fexpr);
+
+ if (num_diagnoses >= MAX_DIAGNOSES)
+ goto DIAGNOSES_FOUND;
+
+ continue;
+
+ } else if (res == PICOSAT_UNSATISFIABLE) {
+
+ } else if (res == PICOSAT_UNKNOWN) {
+ printd("UNKNOWN\n");
+ } else {
+ perror("Doh.");
+ }
+
+ /* check elapsed time */
+ end_t = clock();
+ time_t = ((double) (end_t - start_t)) / CLOCKS_PER_SEC;
+ if (time_t > (double) MAX_SECONDS)
+ goto DIAGNOSES_FOUND;
+
+ /* abort and return results if cancelled by user */
+ if (stop_fixgen) {
+ stop_fixgen = false;
+ goto DIAGNOSES_FOUND;
+ }
+
+ /* get unsat core from SAT solver */
+ X = get_unsat_core_soft(pico, data);
+
+ /* minimise the unsat core */
+ if (MINIMISE_UNSAT_CORE)
+ minimise_unsat_core(pico, X, data);
+
+ if (PRINT_UNSAT_CORE)
+ print_unsat_core(X);
+
+ list_for_each_entry_safe(node, next, &E->list, node) {
+ struct fexpr_node *fnode;
+
+ /* get partial diagnosis */
+ e = node->elem;
+
+ /* check, if there is an intersection between e and X
+ * if there is, go to the next partial diagnosis
+ */
+ if (has_intersection(e, X))
+ continue;
+
+ /* for each fexpr in the core */
+ CF_LIST_FOR_EACH(fnode, X, fexpr) {
+ struct fexpr *x = fnode->elem;
+ bool E2_subset_of_E1;
+ struct fexl_node *lnode;
+ CF_DEF_LIST(E_without_e, fexl);
+ CF_DEF_LIST(x_set, fexpr);
+ struct fexpr_list *E1;
+
+ /* create {x} */
+ CF_PUSH_BACK(x_set, x, fexpr);
+
+ /* create E' = e U {x} */
+ E1 = fexpr_list_union(e, x_set);
+
+ /* create (E\e) U R */
+ CF_LIST_FOR_EACH(lnode, E, fexl) {
+ if (lnode->elem == e)
+ continue;
+ CF_PUSH_BACK(E_without_e,
+ lnode->elem, fexl);
+ }
+ E_R_Union = fexl_list_union(E_without_e, R);
+
+ E2_subset_of_E1 = false;
+
+ /* E" in (E\e) U R */
+ CF_LIST_FOR_EACH(lnode, E_R_Union, fexl) {
+ E2 = lnode->elem;
+
+ /* E" subset of E' ? */
+ if (is_subset_of(E2, E1)) {
+ E2_subset_of_E1 = true;
+ break;
+ }
+ }
+
+ CF_LIST_FREE(E_without_e, fexl);
+ CF_LIST_FREE(E_R_Union, fexl);
+ CF_LIST_FREE(x_set, fexpr);
+
+ /* there exists no E" that is a subset of E' */
+ if (!E2_subset_of_E1)
+ CF_PUSH_BACK(E, E1, fexl);
+ else
+ CF_LIST_FREE(E1, fexpr);
+ }
+
+ CF_LIST_FREE(e, fexpr);
+
+ list_del(&node->node);
+ }
+ CF_LIST_FREE(X, fexpr);
+ }
+
+ struct fexl_node *node;
+DIAGNOSES_FOUND:
+ CF_LIST_FREE(C, fexpr);
+ CF_LIST_FOR_EACH(node, E, fexl)
+ CF_LIST_FREE(node->elem, fexpr);
+ CF_LIST_FREE(E, fexl);
+
+ return R;
+}
+
+/*
+ * add the fexpr to the constraint set C
+ */
+static void add_fexpr_to_constraint_set(struct fexpr_list *C,
+ struct cfdata *data)
+{
+ struct symbol *sym;
+
+ for_all_symbols(sym) {
+ /* must be a proper symbol */
+ if (sym->type == S_UNKNOWN)
+ continue;
+
+ /*
+ * don't need the conflict symbols they are handled separately
+ */
+ if (sym_is_sdv(data->sdv_symbols, sym))
+ continue;
+
+ /* must have a prompt and a name */
+ if (!sym->name || !sym_has_prompt(sym))
+ continue;
+
+ if (sym->type == S_BOOLEAN)
+ CF_PUSH_BACK(C, sym->fexpr_y, fexpr);
+ else if (sym->type == S_TRISTATE) {
+ CF_PUSH_BACK(C, sym->fexpr_y, fexpr);
+ CF_PUSH_BACK(C, sym->fexpr_m, fexpr);
+ } else if (sym->type == S_INT || sym->type == S_HEX ||
+ sym->type == S_STRING) {
+ struct fexpr_node *node;
+
+ CF_LIST_FOR_EACH(node, sym->nb_vals, fexpr)
+ CF_PUSH_BACK(C, node->elem, fexpr);
+ } else {
+ perror("Error adding variables to constraint set C.");
+ }
+ }
+}
+
+/*
+ * check whether the fexpr symbolises the no-value-set fexpr for a non-boolean
+ * symbol
+ */
+static bool fexpr_is_novalue(struct fexpr *e)
+{
+ if (!sym_is_nonboolean(e->sym))
+ return false;
+
+ return e ==
+ list_first_entry(&e->sym->nb_vals->list, struct fexpr_node, node)
+ ->elem;
+}
+
+static void set_assumptions_sdv(PicoSAT *pico, struct sdv_list *arr)
+{
+ struct symbol_dvalue *sdv;
+ struct sdv_node *node;
+ struct symbol *sym;
+
+ CF_LIST_FOR_EACH(node, arr, sdv) {
+ int lit_y;
+
+ sdv = node->elem;
+ sym = sdv->sym;
+
+ lit_y = sym->fexpr_y->satval;
+
+ if (sym->type == S_BOOLEAN) {
+ switch (sdv->tri) {
+ case yes:
+ picosat_assume(pico, lit_y);
+ sym->fexpr_y->assumption = true;
+ nr_of_assumptions_true++;
+ break;
+ case no:
+ picosat_assume(pico, -lit_y);
+ sym->fexpr_y->assumption = false;
+ break;
+ case mod:
+ perror("Should not happen.\n");
+ }
+ nr_of_assumptions++;
+ } else if (sym->type == S_TRISTATE) {
+ int lit_m = sym->fexpr_m->satval;
+
+ switch (sdv->tri) {
+ case yes:
+ picosat_assume(pico, lit_y);
+ sym->fexpr_y->assumption = true;
+ picosat_assume(pico, -lit_m);
+ sym->fexpr_m->assumption = false;
+ nr_of_assumptions_true++;
+ break;
+ case mod:
+ picosat_assume(pico, -lit_y);
+ sym->fexpr_y->assumption = false;
+ picosat_assume(pico, lit_m);
+ sym->fexpr_m->assumption = true;
+ nr_of_assumptions_true++;
+ break;
+ case no:
+ picosat_assume(pico, -lit_y);
+ sym->fexpr_y->assumption = false;
+ picosat_assume(pico, -lit_m);
+ sym->fexpr_y->assumption = false;
+ }
+ nr_of_assumptions += 2;
+ }
+ }
+}
+
+/*
+ * set the assumptions for the next run of Picosat
+ */
+static void set_assumptions(PicoSAT *pico, struct fexpr_list *c,
+ struct cfdata *data)
+{
+ struct fexpr_node *node;
+
+ CF_LIST_FOR_EACH(node, c, fexpr)
+ fexpr_add_assumption(pico, node->elem, node->elem->satval);
+
+ /* set assumptions for the conflict-symbols */
+ set_assumptions_sdv(pico, data->sdv_symbols);
+}
+
+/*
+ * set the assumtption for a fexpr for the next run of Picosat
+ */
+static void fexpr_add_assumption(PicoSAT *pico, struct fexpr *e, int satval)
+{
+ struct symbol *sym = e->sym;
+
+ if (sym->type == S_BOOLEAN) {
+ int tri_val = sym_get_tristate_value(sym);
+
+ if (tri_val == yes) {
+ picosat_assume(pico, satval);
+ e->assumption = true;
+ nr_of_assumptions_true++;
+ } else {
+ picosat_assume(pico, -satval);
+ e->assumption = false;
+ }
+ nr_of_assumptions++;
+ }
+
+ if (sym->type == S_TRISTATE) {
+ int tri_val = sym_get_tristate_value(sym);
+
+ if (e->tri == yes) {
+ if (tri_val == yes) {
+ picosat_assume(pico, satval);
+ e->assumption = true;
+ nr_of_assumptions_true++;
+ } else {
+ picosat_assume(pico, -satval);
+ e->assumption = false;
+ }
+ } else if (e->tri == mod) {
+ if (tri_val == mod) {
+ picosat_assume(pico, satval);
+ e->assumption = true;
+ nr_of_assumptions_true++;
+ } else {
+ picosat_assume(pico, -satval);
+ e->assumption = false;
+ }
+ }
+ nr_of_assumptions++;
+ }
+
+ if (sym->type == S_INT || sym->type == S_HEX || sym->type == S_STRING) {
+
+ char *string_val = (char *) sym_get_string_value(sym);
+
+ if (sym->type == S_STRING && !strcmp(string_val, ""))
+ return;
+
+ /* check, if e symbolises the no-value-set fexpr */
+ if (fexpr_is_novalue(e)) {
+ if (!sym_nonbool_has_value_set(sym)) {
+ picosat_assume(pico, satval);
+ e->assumption = true;
+ nr_of_assumptions_true++;
+ } else {
+ picosat_assume(pico, -satval);
+ e->assumption = false;
+ }
+ }
+ /* check whena string-symbol has value "" */
+ else if (sym->type == S_STRING && !strcmp(string_val, "")) {
+ if (sym_nonbool_has_value_set(sym)) {
+ picosat_assume(pico, satval);
+ e->assumption = true;
+ nr_of_assumptions_true++;
+ } else {
+ picosat_assume(pico, -satval);
+ e->assumption = false;
+ }
+ } else {
+ if (!strcmp(str_get(&e->nb_val), string_val) &&
+ sym_nonbool_has_value_set(sym)) {
+ picosat_assume(pico, satval);
+ e->assumption = true;
+ nr_of_assumptions_true++;
+ } else {
+ picosat_assume(pico, -satval);
+ e->assumption = false;
+ }
+ }
+ nr_of_assumptions++;
+ }
+}
+
+/*
+ * get the unsatisfiable soft constraints from the last run of Picosat
+ */
+static struct fexpr_list *get_unsat_core_soft(PicoSAT *pico,
+ struct cfdata *data)
+{
+ CF_DEF_LIST(ret, fexpr);
+ struct fexpr *e;
+
+ int lit;
+ const int *i = picosat_failed_assumptions(pico);
+
+ lit = abs(*i++);
+
+ while (lit != 0) {
+ e = data->satmap[lit];
+
+ if (!sym_is_sdv(data->sdv_symbols, e->sym))
+ CF_PUSH_BACK(ret, e, fexpr);
+
+ lit = abs(*i++);
+ }
+
+ return ret;
+}
+
+/*
+ * minimise the unsat core C
+ */
+static void minimise_unsat_core(PicoSAT *pico, struct fexpr_list *C,
+ struct cfdata *data)
+{
+ struct fexpr_node *node, *tmp;
+
+ /* no need to check further */
+ if (fexpr_list_has_length_1(C))
+ return;
+
+ list_for_each_entry_safe(node, tmp, &C->list, node) {
+ CF_DEF_LIST(c_set, fexpr);
+ struct fexpr_list *t;
+ int res;
+
+ if (fexpr_list_has_length_1(C))
+ return;
+
+ /* create C\c */
+ CF_PUSH_BACK(c_set, node->elem, fexpr);
+ t = get_difference(C, c_set);
+
+ /* invoke PicoSAT */
+ set_assumptions(pico, t, data);
+
+ res = picosat_sat(pico, -1);
+
+ if (res == PICOSAT_UNSATISFIABLE) {
+ list_del(&node->node);
+ free(node);
+ }
+
+ CF_LIST_FREE(c_set, fexpr);
+ CF_LIST_FREE(t, fexpr);
+ }
+}
+
+
+/*
+ * Calculate C\E0
+ */
+static struct fexpr_list *get_difference(struct fexpr_list *C,
+ struct fexpr_list *E0)
+{
+ CF_DEF_LIST(ret, fexpr);
+ struct fexpr_node *node1, *node2;
+
+ CF_LIST_FOR_EACH(node1, C, fexpr) {
+ bool found = false;
+
+ CF_LIST_FOR_EACH(node2, E0, fexpr) {
+ if (node1->elem->satval == node2->elem->satval) {
+ found = true;
+ break;
+ }
+ }
+ if (!found)
+ CF_PUSH_BACK(ret, node1->elem, fexpr);
+ }
+
+ return ret;
+}
+
+/*
+ * check, if there is an intersection between e and X
+ */
+static bool has_intersection(struct fexpr_list *e, struct fexpr_list *X)
+{
+ struct fexpr_node *node1, *node2;
+
+ CF_LIST_FOR_EACH(node1, e, fexpr)
+ CF_LIST_FOR_EACH(node2, X, fexpr)
+ if (node1->elem->satval == node2->elem->satval)
+ return true;
+
+ return false;
+}
+
+/*
+ * get the union of 2 fexpr_list
+ */
+static struct fexpr_list *fexpr_list_union(struct fexpr_list *A,
+ struct fexpr_list *B)
+{
+ struct fexpr_list *ret = CF_LIST_COPY(A, fexpr);
+ struct fexpr_node *node1, *node2;
+ bool found;
+
+ CF_LIST_FOR_EACH(node2, B, fexpr) {
+ found = false;
+ CF_LIST_FOR_EACH(node1, A, fexpr) {
+ if (node2->elem->satval == node1->elem->satval) {
+ found = true;
+ break;
+ }
+ }
+ if (!found)
+ CF_PUSH_BACK(ret, node2->elem, fexpr);
+ }
+
+ return ret;
+}
+
+/*
+ * get the union of 2 fexl_list
+ */
+static struct fexl_list *fexl_list_union(struct fexl_list *A,
+ struct fexl_list *B)
+{
+ struct fexl_list *ret = CF_LIST_COPY(A, fexl);
+ struct fexl_node *node1, *node2;
+ bool found;
+
+ CF_LIST_FOR_EACH(node2, B, fexl) {
+ found = false;
+ CF_LIST_FOR_EACH(node1, A, fexl) {
+ if (node2->elem == node1->elem) {
+ found = true;
+ break;
+ }
+ }
+ if (!found)
+ CF_PUSH_BACK(ret, node2->elem, fexl);
+ }
+
+ return ret;
+}
+
+/*
+ * check, whether A is a subset of B
+ */
+static bool is_subset_of(struct fexpr_list *A, struct fexpr_list *B)
+{
+ struct fexpr_node *node1, *node2;
+ bool found;
+
+ CF_LIST_FOR_EACH(node1, A, fexpr) {
+ found = false;
+ CF_LIST_FOR_EACH(node2, B, fexpr) {
+ if (node1->elem->satval == node2->elem->satval) {
+ found = true;
+ break;
+ }
+ }
+ if (!found)
+ return false;
+ }
+
+ return true;
+}
+
+/*
+ * print an unsat core
+ */
+static void print_unsat_core(struct fexpr_list *list)
+{
+ struct fexpr_node *node;
+ bool first = true;
+
+ printd("Unsat core: [");
+
+ CF_LIST_FOR_EACH(node, list, fexpr) {
+ if (first)
+ first = false;
+ else
+ printd(", ");
+ printd("%s", str_get(&node->elem->name));
+ printd(" <%s>", node->elem->assumption == true ? "T" : "F");
+ }
+
+ printd("]\n");
+}
+
+
+/*
+ * check if a diagnosis contains a fexpr
+ */
+static bool diagnosis_contains_fexpr(struct fexpr_list *diagnosis,
+ struct fexpr *e)
+{
+ struct fexpr_node *node;
+
+ CF_LIST_FOR_EACH(node, diagnosis, fexpr)
+ if (node->elem->satval == e->satval)
+ return true;
+
+ return false;
+}
+
+/*
+ * check if a diagnosis contains a symbol
+ */
+static bool diagnosis_contains_symbol(struct sfix_list *diagnosis,
+ struct symbol *sym)
+{
+ struct sfix_node *node;
+
+ CF_LIST_FOR_EACH(node, diagnosis, sfix)
+ if (sym == node->elem->sym)
+ return true;
+
+ return false;
+}
+
+/*
+ * print the diagnoses of type fexpr_list
+ */
+static void print_diagnoses(struct fexl_list *diag)
+{
+ struct fexl_node *lnode;
+ unsigned int i = 1;
+
+ CF_LIST_FOR_EACH(lnode, diag, fexl) {
+ struct fexpr_node *node;
+ bool first = true;
+
+ printd("%d: [", i++);
+ CF_LIST_FOR_EACH(node, lnode->elem, fexpr) {
+ char *new_val = node->elem->assumption ? "false" :
+ "true";
+
+ if (first)
+ first = false;
+ else
+ printd(", ");
+ printd("%s => %s", str_get(&node->elem->name), new_val);
+ }
+ printd("]\n");
+ }
+}
+
+/*
+ * print a single diagnosis of type symbol_fix
+ */
+void print_diagnosis_symbol(struct sfix_list *diag_sym)
+{
+ struct symbol_fix *fix;
+ struct sfix_node *node;
+
+ printd("[");
+
+ CF_LIST_FOR_EACH(node, diag_sym, sfix) {
+ fix = node->elem;
+
+ if (fix->type == SF_BOOLEAN)
+ printd("%s => %s", fix->sym->name,
+ tristate_get_char(fix->tri));
+ else if (fix->type == SF_NONBOOLEAN)
+ printd("%s => %s", fix->sym->name,
+ str_get(&fix->nb_val));
+ else
+ perror("NB not yet implemented.");
+
+ if (node->node.next != &diag_sym->list)
+ printd(", ");
+ }
+ printd("]\n");
+}
+
+/*
+ * print the diagnoses of type symbol_fix
+ */
+static void print_diagnoses_symbol(struct sfl_list *diag_sym)
+{
+ struct sfl_node *arr;
+ unsigned int i = 1;
+
+ CF_LIST_FOR_EACH(arr, diag_sym, sfl) {
+ printd("%d: ", i++);
+ print_diagnosis_symbol(arr->elem);
+ }
+}
+
+/*
+ * convert a single diagnosis of fexpr into a diagnosis of symbols
+ */
+static struct sfix_list *convert_diagnosis(struct fexpr_list *diagnosis,
+ struct cfdata *data)
+{
+ CF_DEF_LIST(diagnosis_symbol, sfix);
+ struct fexpr *e;
+ struct symbol_fix *fix;
+ struct symbol_dvalue *sdv;
+ struct sdv_node *snode;
+ struct fexpr_node *fnode;
+
+ /* set the values for the conflict symbols */
+ CF_LIST_FOR_EACH(snode, data->sdv_symbols, sdv) {
+ sdv = snode->elem;
+ fix = xmalloc(sizeof(*fix));
+ fix->sym = sdv->sym;
+ fix->type = SF_BOOLEAN;
+ fix->tri = sdv->tri;
+ CF_PUSH_BACK(diagnosis_symbol, fix, sfix);
+ }
+
+ CF_LIST_FOR_EACH(fnode, diagnosis, fexpr) {
+ enum symbolfix_type type;
+
+ e = fnode->elem;
+
+ /* diagnosis already contains symbol, so continue */
+ if (diagnosis_contains_symbol(diagnosis_symbol, e->sym))
+ continue;
+
+ if (sym_is_boolean(e->sym))
+ type = SF_BOOLEAN;
+ else if (sym_is_nonboolean(e->sym))
+ type = SF_NONBOOLEAN;
+ else
+ type = SF_DISALLOWED;
+ fix = symbol_fix_create(e, type, diagnosis);
+
+ CF_PUSH_BACK(diagnosis_symbol, fix, sfix);
+ }
+
+ return diagnosis_symbol;
+}
+
+/*
+ * convert the diagnoses of fexpr into diagnoses of symbols
+ * it is easier to handle symbols when applying fixes
+ */
+static struct sfl_list *convert_diagnoses(struct fexl_list *diag_arr,
+ struct cfdata *data)
+{
+ struct fexl_node *lnode;
+
+ diagnoses_symbol = CF_LIST_INIT(sfl);
+
+ CF_LIST_FOR_EACH(lnode, diag_arr, fexl) {
+ struct sfix_list *fix = convert_diagnosis(lnode->elem, data);
+
+ CF_PUSH_BACK(diagnoses_symbol, fix, sfl);
+ }
+
+ return diagnoses_symbol;
+}
+
+/*
+ * create a symbol_fix given a fexpr
+ */
+static struct symbol_fix *symbol_fix_create(struct fexpr *e,
+ enum symbolfix_type type,
+ struct fexpr_list *diagnosis)
+{
+ struct symbol_fix *fix = malloc(sizeof(struct symbol_fix));
+
+ fix->sym = e->sym;
+ fix->type = type;
+
+ switch (type) {
+ case SF_BOOLEAN:
+ fix->tri = calculate_new_tri_val(e, diagnosis);
+ break;
+ case SF_NONBOOLEAN:
+ fix->nb_val = str_new();
+ str_append(&fix->nb_val,
+ calculate_new_string_value(e, diagnosis));
+ break;
+ default:
+ perror("Illegal symbolfix_type.\n");
+ }
+
+ return fix;
+}
+
+/*
+ * remove symbols from the diagnosis, which will be set automatically:
+ * 1. symbol gets selected
+ * 2. choice symbol gets enabled/disabled automatically
+ * 3. symbol uses a default value
+ */
+static struct sfl_list *minimise_diagnoses(PicoSAT *pico,
+ struct fexl_list *diagnoses,
+ struct cfdata *data)
+{
+ clock_t start, end;
+ double time;
+ struct fexpr_list *d;
+ struct sfix_list *diagnosis_symbol;
+ CF_DEF_LIST(diagnoses_symbol, sfl);
+ struct fexpr *e;
+ int satval, deref = 0;
+ struct symbol_fix *fix;
+ struct fexl_node *flnode;
+ CF_DEF_LIST(C, fexpr);
+
+ printd("Minimising diagnoses...");
+
+ start = clock();
+
+ /* create soft constraint set C */
+ add_fexpr_to_constraint_set(C, data);
+
+ CF_LIST_FOR_EACH(flnode, diagnoses, fexl) {
+ struct fexpr_node *fnode;
+ struct sfix_node *snode, *snext;
+ struct fexpr_list *C_without_d;
+ int res;
+
+ d = flnode->elem;
+
+ /*
+ * set assumptions for those symbols that don't need to be
+ * changed
+ */
+ C_without_d = get_difference(C, d);
+ set_assumptions(pico, C_without_d, data);
+ CF_LIST_FREE(C_without_d, fexpr);
+ CF_LIST_FREE(C, fexpr);
+
+
+ /* flip the assumptions from the diagnosis */
+ CF_LIST_FOR_EACH(fnode, d, fexpr) {
+ e = fnode->elem;
+ satval = e->assumption ? -(e->satval) : e->satval;
+ picosat_assume(pico, satval);
+ }
+
+ res = picosat_sat(pico, -1);
+ if (res != PICOSAT_SATISFIABLE)
+ perror("Diagnosis not satisfiable (minimise).");
+
+ diagnosis_symbol = convert_diagnosis(d, data);
+
+ /* check if symbol gets selected */
+ list_for_each_entry_safe(snode, snext, &diagnosis_symbol->list,
+ node) {
+ fix = snode->elem;
+
+ /* symbol is never selected, continue */
+ if (!fix->sym->fexpr_sel_y)
+ continue;
+
+ /* check, whether the symbol was selected anyway */
+ if (fix->sym->type == S_BOOLEAN && fix->tri == yes)
+ deref = picosat_deref(
+ pico, fix->sym->fexpr_sel_y->satval);
+ else if (fix->sym->type == S_TRISTATE &&
+ fix->tri == yes)
+ deref = picosat_deref(
+ pico, fix->sym->fexpr_sel_y->satval);
+ else if (fix->sym->type == S_TRISTATE &&
+ fix->tri == mod)
+ deref = picosat_deref(
+ pico, fix->sym->fexpr_sel_m->satval);
+
+ if (deref == 1)
+ list_del(&snode->node);
+ else
+ deref = 0;
+ }
+ CF_PUSH_BACK(diagnoses_symbol, diagnosis_symbol, sfl);
+ }
+
+ end = clock();
+ time = ((double) (end - start)) / CLOCKS_PER_SEC;
+
+ printd("done. (%.6f secs.)\n", time);
+
+ return diagnoses_symbol;
+}
+
+/*
+ * list the diagnoses and let user choose a diagnosis to be applied
+ */
+struct sfix_list *ask_user_choose_fix(struct sfl_list *diag)
+{
+ int choice;
+ struct sfl_node *ret;
+
+ printd("=== GENERATED DIAGNOSES ===\n");
+ printd("0: No changes wanted\n");
+ print_diagnoses_symbol(diag);
+
+ printd("\n> Choose option: ");
+ scanf("%d", &choice);
+
+ /* no changes wanted */
+ if (choice == 0)
+ return NULL;
+
+ ret = cflist_at_index(choice - 1, &diag->list, struct sfl_node, node);
+ return ret ? ret->elem : NULL;
+}
+
+
+/*
+ * calculate the new value for a boolean symbol given a diagnosis and an fexpr
+ */
+static tristate calculate_new_tri_val(struct fexpr *e,
+ struct fexpr_list *diagnosis)
+{
+ assert(sym_is_boolean(e->sym));
+
+ /* return the opposite of the last assumption for booleans */
+ if (e->sym->type == S_BOOLEAN)
+ return e->assumption ? no : yes;
+
+ /* new values for tristate must be deduced from the diagnosis */
+ if (e->sym->type == S_TRISTATE) {
+ /* fexpr_y */
+ if (e->tri == yes) {
+ if (e->assumption == true)
+ /*
+ * if diagnosis contains fexpr_m, fexpr_m was
+ * false => new value is mod
+ */
+ return diagnosis_contains_fexpr(
+ diagnosis, e->sym->fexpr_m) ?
+ mod :
+ no;
+ else if (e->assumption == false)
+ /*
+ * if fexpr_y is set to true, the new value
+ * must be yes
+ */
+ return yes;
+ }
+ /* fexpr_m */
+ if (e->tri == mod) {
+ if (e->assumption == true)
+ /*
+ * if diagnosis contains fexpr_y, fexpr_y was
+ * false => new value is yes
+ */
+ return diagnosis_contains_fexpr(
+ diagnosis, e->sym->fexpr_m) ?
+ yes :
+ no;
+ else if (e->assumption == false)
+ /*
+ * if diagnosis contains fexpr_m, the new value
+ * must be mod
+ */
+ return mod;
+ }
+ perror("Should not get here.\n");
+ }
+
+ perror("Error calculating new tristate value.\n");
+ return no;
+}
+
+/*
+ * calculate the new value for a non-boolean symbol given a diagnosis and an
+ * fexpr
+ */
+static const char *calculate_new_string_value(struct fexpr *e,
+ struct fexpr_list *diagnosis)
+{
+ struct fexpr_node *node;
+ struct fexpr *e2;
+
+ assert(sym_is_nonboolean(e->sym));
+
+ /* if assumption was false before, this is the new value because only 1
+ * variable can be true
+ */
+ if (e->assumption == false)
+ return str_get(&e->nb_val);
+
+ /* a diagnosis always contains 2 variables for the same non-boolean
+ * symbol one is set to true, the other to false
+ * otherwise you'd set 2 variables to true, which is not allowed
+ */
+ CF_LIST_FOR_EACH(node, diagnosis, fexpr) {
+ e2 = node->elem;
+
+ /* not interested in other symbols or the same fexpr */
+ if (e->sym != e2->sym || e->satval == e2->satval)
+ continue;
+
+ return str_get(&e2->nb_val);
+ }
+
+ perror("Error calculating new string value.\n");
+ return "";
+}
+
+static bool fexpr_list_has_length_1(struct fexpr_list *list)
+{
+ struct fexpr_node *node;
+ bool first = true;
+
+ CF_LIST_FOR_EACH(node, list, fexpr) {
+ if (first)
+ first = false;
+ else
+ return false;
+ }
+ return true;
+}
new file mode 100644
@@ -0,0 +1,21 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2023 Patrick Franz <deltaone@debian.org>
+ */
+
+#ifndef CF_FIXGEN_H
+#define CF_FIXGEN_H
+
+#include "picosat_functions.h"
+#include "cf_defs.h"
+
+/* initialize fixgen and return the diagnoses */
+struct sfl_list *fixgen_run(PicoSAT *pico, struct cfdata *data);
+
+/* ask user which fix to apply */
+struct sfix_list *ask_user_choose_fix(struct sfl_list *diag);
+
+/* print a single diagnosis of type symbol_fix */
+void print_diagnosis_symbol(struct sfix_list *diag_sym);
+
+#endif