new file mode 100644
@@ -0,0 +1,1017 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2021 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 "configfix.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 fexl_list *diagnoses;
+static struct sfl_list *diagnoses_symbol;
+
+static struct fexl_list * generate_diagnoses(PicoSAT *pico);
+
+static void add_fexpr_to_constraint_set(struct fexpr_list *C);
+static void set_assumptions(PicoSAT *pico, struct fexpr_list *c);
+static void fexpr_add_assumption(PicoSAT *pico, struct fexpr *e, int satval);
+static struct fexpr_list * get_unsat_core_soft(PicoSAT *pico);
+static struct fexpr_list * minimise_unsat_core(PicoSAT *pico, struct fexpr_list *C);
+
+
+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);
+static struct sfix_list * convert_diagnosis(struct fexpr_list *diagnosis);
+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);
+
+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);
+
+/* count assumptions, only used for debugging */
+static unsigned int nr_of_assumptions = 0, nr_of_assumptions_true = 0;
+
+/* -------------------------------------- */
+
+struct sfl_list * rangefix_run(PicoSAT *pico)
+{
+ printd("Starting RangeFix...\n");
+ printd("Generating diagnoses...");
+ clock_t start, end;
+ double time;
+ start = clock();
+
+ /* generate the diagnoses */
+ diagnoses = generate_diagnoses(pico);
+
+ 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);
+ else
+ diagnoses_symbol = convert_diagnoses(diagnoses);
+
+ printd("\n");
+
+ return diagnoses_symbol;
+}
+
+/*
+ * generate the diagnoses
+ */
+static struct fexl_list * generate_diagnoses(PicoSAT *pico)
+{
+ struct fexpr_list *C = fexpr_list_init();
+ struct fexl_list *E = fexl_list_init();
+ struct fexl_list *R = fexl_list_init();
+ struct fexpr_list *X, *e, *x_set, *E1, *E2;
+ struct fexl_list *E_R_Union;
+
+ /* create constraint set C */
+ add_fexpr_to_constraint_set(C);
+
+ if (PRINT_UNSAT_CORE)
+ printd("\n");
+
+ /* init E with an empty diagnosis */
+ struct fexpr_list *empty_diagnosis = fexpr_list_init();
+ fexl_list_add(E, empty_diagnosis);
+
+ /* start the clock */
+ clock_t start_t, end_t;
+ double time_t;
+ start_t = clock();
+
+ while (E->size > 0) {
+ /* get random diagnosis */
+ struct fexpr_list *E0 = E->head->elem;
+
+ /* calculate C\E0 */
+ struct fexpr_list *c = get_difference(C, E0);
+
+ /* set assumptions */
+ nr_of_assumptions = 0;
+ nr_of_assumptions_true = 0;
+ set_assumptions(pico, c);
+
+ int res = picosat_sat(pico, -1);
+
+ if (res == PICOSAT_SATISFIABLE) {
+ if (PRINT_DIAGNOSIS_FOUND && CFDEBUG)
+ fexpr_list_print("DIAGNOSIS FOUND", E0);
+
+ fexl_list_delete(E, E->head);
+ if (E0->size > 0)
+ fexl_list_add(R, E0);
+ else
+ fexpr_list_free(E0);
+
+ fexpr_list_free(c);
+
+ if (R->size >= 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;
+
+ /* get unsat core from SAT solver */
+ X = get_unsat_core_soft(pico);
+
+ /* minimise the unsat core */
+ if (MINIMISE_UNSAT_CORE)
+ X = minimise_unsat_core(pico, X);
+
+ if (PRINT_UNSAT_CORE)
+ print_unsat_core(X);
+
+ struct fexl_node *node, *tmp;
+ for (node = E->head; node != NULL;) {
+ /* 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)) {
+ node = node->next;
+ continue;
+ }
+
+ /* for each fexpr in the core */
+ struct fexpr_node *fnode;
+ fexpr_list_for_each(fnode, X) {
+ struct fexpr *x = fnode->elem;
+
+ /* create {x} */
+ x_set = fexpr_list_init();
+ fexpr_list_add(x_set, x);
+
+ /* create E' = e ∪ {x} */
+ E1 = fexpr_list_union(e, x_set);
+
+ /* create (E\e) ∪ R */
+ E_R_Union = fexl_list_copy(E);
+ fexl_list_delete_elem(E_R_Union, e);
+ E_R_Union = fexl_list_union(E_R_Union, R);
+
+ bool E2_subset_of_E1 = false;
+
+ /* E" ∈ (E\e) ∪ R */
+ struct fexl_node *lnode;
+ fexl_list_for_each(lnode, E_R_Union) {
+ E2 = lnode->elem;
+
+ /* E" ⊆ E' ? */
+ if (is_subset_of(E2, E1)) {
+ E2_subset_of_E1 = true;
+ break;
+ }
+ }
+
+ fexl_list_free(E_R_Union);
+
+ /* ∄ E" ⊆ E' */
+ if (!E2_subset_of_E1)
+ fexl_list_add(E, E1);
+ else
+ fexpr_list_free(E1);
+ }
+
+ fexpr_list_free(e);
+
+ tmp = node->next;
+ fexl_list_delete(E, node);
+ node = tmp;
+ }
+ fexpr_list_free(X);
+ fexpr_list_free(c);
+ }
+
+DIAGNOSES_FOUND:
+ fexpr_list_free(C);
+ fexl_list_free(E);
+
+ return R;
+}
+
+/*
+ * add the fexpr to the constraint set C
+ */
+static void add_fexpr_to_constraint_set(struct fexpr_list *C)
+{
+ unsigned int i, nr_sym = 0, nr_fexpr = 0;
+ struct symbol *sym;
+ for_all_symbols(i, sym) {
+ /* must be a proper symbol */
+ if (sym->type == S_UNKNOWN)
+ continue;
+
+ /* don't need the conflict symbols
+ * they are handled seperately */
+ if (sym_is_sdv(sdv_symbols, sym))
+ continue;
+
+ /* must have a prompt and a name */
+ if (!sym->name || !sym_has_prompt(sym))
+ continue;
+
+ nr_sym++;
+
+ if (sym->type == S_BOOLEAN) {
+ fexpr_list_add(C, sym->fexpr_y);
+ nr_fexpr++;
+ } else if (sym->type == S_TRISTATE) {
+ fexpr_list_add(C, sym->fexpr_y);
+ fexpr_list_add(C, sym->fexpr_m);
+ nr_fexpr += 2;
+ } else if (sym->type == S_INT || sym->type == S_HEX || sym->type == S_STRING) {
+ struct fexpr_node *node;
+ fexpr_list_for_each(node, sym->nb_vals) {
+ fexpr_list_add(C, node->elem);
+ nr_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 == e->sym->nb_vals->head->elem;
+}
+
+static void set_assumptions_sdv(PicoSAT *pico, struct sdv_list *arr)
+{
+ struct symbol_dvalue *sdv;
+ struct sdv_node *node;
+ struct symbol *sym;
+
+ sdv_list_for_each(node, arr) {
+ sdv = node->elem;
+ sym = sdv->sym;
+
+ int 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 fexpr_node *node;
+ fexpr_list_for_each(node, c)
+ fexpr_add_assumption(pico, node->elem, node->elem->satval);
+
+ /* set assumptions for the conflict-symbols */
+ set_assumptions_sdv(pico, 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)) {
+ 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 fexpr_list *ret = fexpr_list_init();
+ struct fexpr *e;
+
+ int *lit = malloc(sizeof(int));
+ const int *i = picosat_failed_assumptions(pico);
+ *lit = abs(*i++);
+
+ while (*lit != 0) {
+ e = &satmap[*lit];
+
+ if (!sym_is_sdv(sdv_symbols, e->sym))
+ fexpr_list_add(ret, e);
+
+ *lit = abs(*i++);
+ }
+
+ return ret;
+}
+
+/*
+ * minimise the unsat core C
+ */
+static struct fexpr_list * minimise_unsat_core(PicoSAT *pico, struct fexpr_list *C)
+{
+ /* no need to check further */
+ if (C->size == 1)
+ return C;
+
+ struct fexpr_list *c_set;
+ struct fexpr_node *node, *tmp;
+
+ for (node = C->head; node != NULL;) {
+ if (C->size == 1)
+ return C;
+
+ /* create C\c */
+ c_set = fexpr_list_init();
+ fexpr_list_add(c_set, node->elem);
+ struct fexpr_list *t = get_difference(C, c_set);
+
+ /* invoke PicoSAT */
+ set_assumptions(pico, t);
+
+ int res = picosat_sat(pico, -1);
+
+ tmp = node->next;
+
+ if (res == PICOSAT_UNSATISFIABLE)
+ fexpr_list_delete(C, node);
+
+ node = tmp;
+
+ fexpr_list_free(c_set);
+ fexpr_list_free(t);
+ }
+
+ return C;
+}
+
+
+/*
+ * Calculate C\E0
+ */
+static struct fexpr_list * get_difference(struct fexpr_list *C, struct fexpr_list *E0)
+{
+ struct fexpr_list *ret = fexpr_list_init();
+ struct fexpr_node *node1, *node2;
+ bool found;
+
+ fexpr_list_for_each(node1, C) {
+ found = false;
+ fexpr_list_for_each(node2, E0) {
+ if (node1->elem->satval == node2->elem->satval) {
+ found = true;
+ break;
+ }
+ }
+ if (!found)
+ fexpr_list_add(ret, node1->elem);
+ }
+
+ 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;
+ fexpr_list_for_each(node1, e)
+ fexpr_list_for_each(node2, X)
+ 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 = fexpr_list_copy(A);
+ struct fexpr_node *node1, *node2;
+ bool found;
+
+ fexpr_list_for_each(node2, B) {
+ found = false;
+ fexpr_list_for_each(node1, A) {
+ if (node2->elem->satval == node1->elem->satval) {
+ found = true;
+ break;
+ }
+ }
+ if (!found)
+ fexpr_list_add(ret, node2->elem);
+ }
+
+ 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 = fexl_list_copy(A);
+ struct fexl_node *node1, *node2;
+ bool found;
+
+ fexl_list_for_each(node2, B) {
+ found = false;
+ fexl_list_for_each(node1, A) {
+ if (node2->elem == node1->elem) {
+ found = true;
+ break;
+ }
+ }
+ if (!found)
+ fexl_list_add(ret, node2->elem);
+ }
+
+ 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;
+
+ fexpr_list_for_each(node1, A) {
+ found = false;
+ fexpr_list_for_each(node2, B) {
+ 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;
+ printd("Unsat core: [");
+
+ fexpr_list_for_each(node, list) {
+ printd("%s", str_get(&node->elem->name));
+ printd(" <%s>", node->elem->assumption == true ? "T" : "F");
+ if (node->next != NULL)
+ printd(", ");
+ }
+
+ 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;
+
+ fexpr_list_for_each(node, diagnosis)
+ 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;
+
+ sfix_list_for_each(node, diagnosis)
+ 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;
+
+ fexl_list_for_each(lnode, diag) {
+ printd("%d: [", i++);
+ struct fexpr_node *node;
+ fexpr_list_for_each(node, lnode->elem) {
+ char *new_val = node->elem->assumption ? "false" : "true";
+ printd("%s => %s", str_get(&node->elem->name), new_val);
+ if (node->next != NULL)
+ printd(", ");
+ }
+ 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("[");
+
+ sfix_list_for_each(node, diag_sym) {
+ 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->next != NULL)
+ 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;
+
+ sfl_list_for_each(arr, diag_sym) {
+ 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 sfix_list *diagnosis_symbol = sfix_list_init();
+ struct fexpr *e;
+ struct symbol_fix *fix;
+ struct symbol_dvalue *sdv;
+
+ /* set the values for the conflict symbols */
+ struct sdv_node *snode;
+ sdv_list_for_each(snode, sdv_symbols) {
+ sdv = snode->elem;
+ fix = xcalloc(1, sizeof(*fix));
+ fix->sym = sdv->sym;
+ fix->type = SF_BOOLEAN;
+ fix->tri = sdv->tri;
+ sfix_list_add(diagnosis_symbol, fix);
+ }
+
+ struct fexpr_node * fnode;
+ fexpr_list_for_each(fnode, diagnosis) {
+ e = fnode->elem;
+
+ /* diagnosis already contains symbol, so continue */
+ if (diagnosis_contains_symbol(diagnosis_symbol, e->sym))
+ continue;
+
+ enum symbolfix_type type;
+ 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);
+
+ sfix_list_add(diagnosis_symbol, fix);
+ }
+
+ 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)
+{
+ diagnoses_symbol = sfl_list_init();
+
+ struct fexl_node *lnode;
+ fexl_list_for_each(lnode, diag_arr) {
+ struct sfix_list *fix = convert_diagnosis(lnode->elem);
+ sfl_list_add(diagnoses_symbol, fix);
+ }
+
+ 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)
+{
+ clock_t start, end;
+ double time;
+
+ printd("Minimising diagnoses...");
+
+ start = clock();
+
+ struct fexpr_list *d;
+ struct sfix_list *diagnosis_symbol;
+ struct sfl_list *diagnoses_symbol = sfl_list_init();
+ struct fexpr *e;
+ int satval, deref = 0;
+ struct symbol_fix *fix;
+
+ /* create soft constraint set C */
+ struct fexpr_list *C = fexpr_list_init();
+ add_fexpr_to_constraint_set(C);
+
+ struct fexl_node *flnode;
+ fexl_list_for_each(flnode, diagnoses) {
+ d = flnode->elem;
+
+ /* set assumptions for those symbols that don't need to be changed */
+ set_assumptions(pico, get_difference(C, d));
+
+ /* flip the assumptions from the diagnosis */
+ struct fexpr_node *fnode;
+ fexpr_list_for_each(fnode, d) {
+ e = fnode->elem;
+ satval = e->assumption ? -(e->satval) : e->satval;
+ picosat_assume(pico, satval);
+ }
+
+ int res = picosat_sat(pico, -1);
+ if (res != PICOSAT_SATISFIABLE)
+ perror("Diagnosis not satisfiable (minimise).");
+
+ diagnosis_symbol = convert_diagnosis(d);
+
+ /* check if symbol gets selected */
+ struct sfix_node *snode;
+ for (snode = diagnosis_symbol->head; snode != NULL;) {
+ fix = snode->elem;
+
+ /* symbol is never selected, continue */
+ if (!fix->sym->fexpr_sel_y) {
+ snode = snode->next;
+ 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) {
+ struct sfix_node *tmp = snode->next;
+ sfix_list_delete(diagnosis_symbol, snode);
+ snode = tmp;
+ } else {
+ deref = 0;
+ snode = snode->next;
+ }
+ }
+ sfl_list_add(diagnoses_symbol, diagnosis_symbol);
+ }
+
+ 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 * choose_fix(struct sfl_list *diag)
+{
+ printd("=== GENERATED DIAGNOSES ===\n");
+ printd("0: No changes wanted\n");
+ print_diagnoses_symbol(diag);
+
+ int choice;
+ printd("\n> Choose option: ");
+ scanf("%d", &choice);
+
+ /* no changes wanted */
+ if (choice == 0)
+ return NULL;
+
+ /* invalid choice */
+ if (choice > diag->size)
+ return NULL;
+
+ unsigned int counter;
+ struct sfl_node *node = diag->head;
+ for (counter = 1; counter < choice; counter++)
+ node = node->next;
+
+ return node->elem;
+}
+
+
+/*
+ * 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)
+{
+ 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 */
+ struct fexpr_node *node;
+ struct fexpr *e2;
+ fexpr_list_for_each(node, diagnosis) {
+ 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 "";
+}
new file mode 100644
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2021 Patrick Franz <deltaone@debian.org>
+ */
+
+#ifndef CF_RANGEFIX_H
+#define CF_RANGEFIX_H
+
+/* initialize RangeFix and return the diagnoses */
+struct sfl_list * rangefix_run(PicoSAT *pico);
+
+/* ask user which fix to apply */
+struct sfix_list * choose_fix(struct sfl_list *diag);
+
+/* print a single diagnosis of type symbol_fix */
+void print_diagnosis_symbol(struct sfix_list *diag_sym);
+
+#endif