diff options
| -rw-r--r-- | scripts/kconfig/symbol.c | 142 |
1 files changed, 127 insertions, 15 deletions
diff --git a/scripts/kconfig/symbol.c b/scripts/kconfig/symbol.c index 9f180ab7698d..bc1e1584e2da 100644 --- a/scripts/kconfig/symbol.c +++ b/scripts/kconfig/symbol.c @@ -783,6 +783,110 @@ struct symbol **sym_re_search(const char *pattern) return sym_arr; } +/* + * When we check for recursive dependencies we use a stack to save + * current state so we can print out relevant info to user. + * The entries are located on the call stack so no need to free memory. + * Note inser() remove() must always match to properly clear the stack. + */ +static struct dep_stack { + struct dep_stack *prev, *next; + struct symbol *sym; + struct property *prop; + struct expr *expr; +} *check_top; + +static void dep_stack_insert(struct dep_stack *stack, struct symbol *sym) +{ + memset(stack, 0, sizeof(*stack)); + if (check_top) + check_top->next = stack; + stack->prev = check_top; + stack->sym = sym; + check_top = stack; +} + +static void dep_stack_remove(void) +{ + check_top = check_top->prev; + if (check_top) + check_top->next = NULL; +} + +/* + * Called when we have detected a recursive dependency. + * check_top point to the top of the stact so we use + * the ->prev pointer to locate the bottom of the stack. + */ +static void sym_check_print_recursive(struct symbol *last_sym) +{ + struct dep_stack *stack; + struct symbol *sym, *next_sym; + struct menu *menu = NULL; + struct property *prop; + struct dep_stack cv_stack; + + if (sym_is_choice_value(last_sym)) { + dep_stack_insert(&cv_stack, last_sym); + last_sym = prop_get_symbol(sym_get_choice_prop(last_sym)); + } + + for (stack = check_top; stack != NULL; stack = stack->prev) + if (stack->sym == last_sym) + break; + if (!stack) { + fprintf(stderr, "unexpected recursive dependency error\n"); + return; + } + + for (; stack; stack = stack->next) { + sym = stack->sym; + next_sym = stack->next ? stack->next->sym : last_sym; + prop = stack->prop; + + /* for choice values find the menu entry (used below) */ + if (sym_is_choice(sym) || sym_is_choice_value(sym)) { + for (prop = sym->prop; prop; prop = prop->next) { + menu = prop->menu; + if (prop->menu) + break; + } + } + if (stack->sym == last_sym) + fprintf(stderr, "%s:%d:error: recursive dependency detected!\n", + prop->file->name, prop->lineno); + if (stack->expr) { + fprintf(stderr, "%s:%d:\tsymbol %s %s value contains %s\n", + prop->file->name, prop->lineno, + sym->name ? sym->name : "<choice>", + prop_get_type_name(prop->type), + next_sym->name ? next_sym->name : "<choice>"); + } else if (stack->prop) { + fprintf(stderr, "%s:%d:\tsymbol %s depends on %s\n", + prop->file->name, prop->lineno, + sym->name ? sym->name : "<choice>", + next_sym->name ? next_sym->name : "<choice>"); + } else if (sym_is_choice(sym)) { + fprintf(stderr, "%s:%d:\tchoice %s contains symbol %s\n", + menu->file->name, menu->lineno, + sym->name ? sym->name : "<choice>", + next_sym->name ? next_sym->name : "<choice>"); + } else if (sym_is_choice_value(sym)) { + fprintf(stderr, "%s:%d:\tsymbol %s is part of choice %s\n", + menu->file->name, menu->lineno, + sym->name ? sym->name : "<choice>", + next_sym->name ? next_sym->name : "<choice>"); + } else { + fprintf(stderr, "%s:%d:\tsymbol %s is selected by %s\n", + prop->file->name, prop->lineno, + sym->name ? sym->name : "<choice>", + next_sym->name ? next_sym->name : "<choice>"); + } + } + + if (check_top == &cv_stack) + dep_stack_remove(); +} static struct symbol *sym_check_expr_deps(struct expr *e) { @@ -819,24 +923,33 @@ static struct symbol *sym_check_sym_deps(struct symbol *sym) { struct symbol *sym2; struct property *prop; + struct dep_stack stack; + + dep_stack_insert(&stack, sym); sym2 = sym_check_expr_deps(sym->rev_dep.expr); if (sym2) - return sym2; + goto out; for (prop = sym->prop; prop; prop = prop->next) { if (prop->type == P_CHOICE || prop->type == P_SELECT) continue; + stack.prop = prop; sym2 = sym_check_expr_deps(prop->visible.expr); if (sym2) break; if (prop->type != P_DEFAULT || sym_is_choice(sym)) continue; + stack.expr = prop->expr; sym2 = sym_check_expr_deps(prop->expr); if (sym2) break; + stack.expr = NULL; } +out: + dep_stack_remove(); + return sym2; } @@ -845,6 +958,9 @@ static struct symbol *sym_check_choice_deps(struct symbol *choice) struct symbol *sym, *sym2; struct property *prop; struct expr *e; + struct dep_stack stack; + + dep_stack_insert(&stack, choice); prop = sym_get_choice_prop(choice); expr_list_for_each_sym(prop->expr, e, sym) @@ -858,10 +974,8 @@ static struct symbol *sym_check_choice_deps(struct symbol *choice) expr_list_for_each_sym(prop->expr, e, sym) { sym2 = sym_check_sym_deps(sym); - if (sym2) { - fprintf(stderr, " -> %s", sym->name); + if (sym2) break; - } } out: expr_list_for_each_sym(prop->expr, e, sym) @@ -871,6 +985,8 @@ out: prop_get_symbol(sym_get_choice_prop(sym2)) == choice) sym2 = choice; + dep_stack_remove(); + return sym2; } @@ -880,18 +996,20 @@ struct symbol *sym_check_deps(struct symbol *sym) struct property *prop; if (sym->flags & SYMBOL_CHECK) { - fprintf(stderr, "%s:%d:error: found recursive dependency: %s", - sym->prop->file->name, sym->prop->lineno, - sym->name ? sym->name : "<choice>"); + sym_check_print_recursive(sym); return sym; } if (sym->flags & SYMBOL_CHECKED) return NULL; if (sym_is_choice_value(sym)) { + struct dep_stack stack; + /* for choice groups start the check with main choice symbol */ + dep_stack_insert(&stack, sym); prop = sym_get_choice_prop(sym); sym2 = sym_check_deps(prop_get_symbol(prop)); + dep_stack_remove(); } else if (sym_is_choice(sym)) { sym2 = sym_check_choice_deps(sym); } else { @@ -900,14 +1018,8 @@ struct symbol *sym_check_deps(struct symbol *sym) sym->flags &= ~SYMBOL_CHECK; } - if (sym2) { - fprintf(stderr, " -> %s", sym->name ? sym->name : "<choice>"); - if (sym2 == sym) { - fprintf(stderr, "\n"); - zconfnerrs++; - sym2 = NULL; - } - } + if (sym2 && sym2 == sym) + sym2 = NULL; return sym2; } |