X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/6fbe73b6a048046a4e674df12d5db9223acac67c..671850a1c3e1aaac93a89fabc6d810be6a4a77fe:/src/scan-code.l?ds=sidebyside diff --git a/src/scan-code.l b/src/scan-code.l index 96cab6d1..308d1d0d 100644 --- a/src/scan-code.l +++ b/src/scan-code.l @@ -1,6 +1,6 @@ /* Bison Action Scanner -*- C -*- - Copyright (C) 2006-2012 Free Software Foundation, Inc. + Copyright (C) 2006-2015 Free Software Foundation, Inc. This file is part of Bison, the GNU Compiler Compiler. @@ -78,8 +78,9 @@ static bool untyped_var_seen; /* POSIX says that a tag must be both an id and a C union member, but historically almost any character is allowed in a tag. We disallow - NUL and newline, as this simplifies our implementation. */ -tag [^\0\n>]+ + NUL and newline, as this simplifies our implementation. We allow + "->" as a means to dereference a pointer. */ +tag ([^\0\n>]|->)+ /* Zero or more instances of backslash-newline. Following GCC, allow white space between the backslash and the newline. */ @@ -95,26 +96,6 @@ ref -?[0-9]+|{id}|"["{id}"]"|"$" %% %{ - /* Nesting level of the current code in braces. */ - int braces_level = 0; - - /* Whether a semicolon is probably needed. - - The heuristic is that a semicolon is not needed after '{', '}', - ';', or a C preprocessor directive, and that whitespaces and - comments do not affect this flag. Note that '{' does not need a - semicolon because of '{}'. A semicolon may be needed before a - cpp directive, but don't bother. - - While it is maintained in several start-conditions (factoring - opportunities), it is meaningful only for SC_RULE_ACTION. */ - bool need_semicolon = false; - - /* Whether in a C preprocessor directive. Don't use a start condition - for this because, at the end of strings and comments, we still need - to know whether we're in a directive. */ - bool in_cpp = false; - /* This scanner is special: it is invoked only once, henceforth is expected to return only once. This initialization is therefore done once per action to translate. */ @@ -167,32 +148,14 @@ ref -?[0-9]+|{id}|"["{id}"]"|"$" { - "'" { - STRING_GROW; - BEGIN SC_CHARACTER; - need_semicolon = true; - } - "\"" { - STRING_GROW; - BEGIN SC_STRING; - need_semicolon = true; - } - "/"{splice}"*" { - STRING_GROW; - BEGIN SC_COMMENT; - } - "/"{splice}"/" { - STRING_GROW; - BEGIN SC_LINE_COMMENT; - } + "'" STRING_GROW; BEGIN SC_CHARACTER; + "\"" STRING_GROW; BEGIN SC_STRING; + "/"{splice}"*" STRING_GROW; BEGIN SC_COMMENT; + "/"{splice}"/" STRING_GROW; BEGIN SC_LINE_COMMENT; + [$@] { - complain_at (*loc, Wother, _("stray '%s'"), yytext); + complain (loc, Wother, _("stray '%s'"), yytext); obstack_escape (&obstack_for_string, yytext); - need_semicolon = true; - } - [\[\]] { - obstack_escape (&obstack_for_string, yytext); - need_semicolon = true; } } @@ -203,49 +166,13 @@ ref -?[0-9]+|{id}|"["{id}"]"|"$" handle_action_dollar (self->rule, yytext, *loc); if (ref_tail_fields) obstack_sgrow (&obstack_for_string, ref_tail_fields); - need_semicolon = true; } "@"{ref} { ref_tail_fields = NULL; handle_action_at (self->rule, yytext, *loc); if (ref_tail_fields) obstack_sgrow (&obstack_for_string, ref_tail_fields); - need_semicolon = true; - } - - ";" STRING_GROW; need_semicolon = false; - "{" STRING_GROW; ++braces_level; need_semicolon = false; - "}" { - bool outer_brace = --braces_level == 0; - - /* As an undocumented Bison extension, append ';' before the last - brace in braced code, so that the user code can omit trailing - ';'. But do not append ';' if emulating Yacc, since Yacc does - not append one. */ - if (outer_brace && !yacc_flag && language_prio == default_prio - && skeleton_prio == default_prio && need_semicolon && ! in_cpp) - { - complain_at (*loc, Wother, - _("a ';' might be needed at the end of action code")); - complain_at (*loc, Wother, - _("future versions of Bison will not add the ';'")); - obstack_1grow (&obstack_for_string, ';'); - } - - STRING_GROW; - need_semicolon = false; } - - /* Preprocessing directives should only be recognized at the beginning - of lines, allowing whitespace including comments, but in C/C++, - '#' can only be the start of preprocessor directives or within - '#define' directives anyway, so don't bother with begin of line. */ - "#" STRING_GROW; in_cpp = true; - - {splice} STRING_GROW; - [\n\r] STRING_GROW; if (in_cpp) in_cpp = need_semicolon = false; - [ \t\f] STRING_GROW; - . STRING_GROW; need_semicolon = true; } @@ -400,23 +327,34 @@ get_at_spec(unsigned symbol_index) } static void -show_sub_message (const char* cp, bool explicit_bracketing, +show_sub_message (warnings warning, + const char* cp, bool explicit_bracketing, int midrule_rhs_index, char dollar_or_at, - warnings wflags, unsigned indent, - const variant *var) + unsigned indent, const variant *var) { const char *at_spec = get_at_spec (var->symbol_index); if (var->err == 0) - complain_at_indent (var->loc, wflags, &indent, - _("refers to: %c%s at %s"), dollar_or_at, - var->id, at_spec); + complain_indent (&var->loc, warning, &indent, + _("refers to: %c%s at %s"), dollar_or_at, + var->id, at_spec); else { static struct obstack msg_buf; const char *tail = explicit_bracketing ? "" : cp + strlen (var->id); - const char *id = var->hidden_by ? var->hidden_by->id : var->id; - location id_loc = var->hidden_by ? var->hidden_by->loc : var->loc; + const char *id; + location id_loc; + + if (var->hidden_by) + { + id = var->hidden_by->id; + id_loc = var->hidden_by->loc; + } + else + { + id = var->id; + id_loc = var->loc; + } /* Create the explanation message. */ obstack_init (&msg_buf); @@ -445,23 +383,25 @@ show_sub_message (const char* cp, bool explicit_bracketing, _(", cannot be accessed from mid-rule action at $%d"), midrule_rhs_index); - complain_at_indent (id_loc, wflags, &indent, "%s", - obstack_finish0 (&msg_buf)); + complain_indent (&id_loc, warning, &indent, "%s", + obstack_finish0 (&msg_buf)); obstack_free (&msg_buf, 0); } } static void -show_sub_messages (const char* cp, bool explicit_bracketing, +show_sub_messages (warnings warning, + const char* cp, bool explicit_bracketing, int midrule_rhs_index, char dollar_or_at, - warnings wflags, unsigned indent) + unsigned indent) { unsigned i; for (i = 0; i < variant_count; ++i) - show_sub_message (cp, explicit_bracketing, + show_sub_message (warning | silent, + cp, explicit_bracketing, midrule_rhs_index, dollar_or_at, - wflags, indent, &variant_table[i]); + indent, &variant_table[i]); } /* Returned from "parse_ref" when the reference @@ -472,9 +412,6 @@ show_sub_messages (const char* cp, bool explicit_bracketing, points to LHS ($$) of the current rule or midrule. */ #define LHS_REF (INT_MIN + 1) -/* Sub-messages indent. */ -#define SUB_INDENT (4) - /* Parse named or positional reference. In case of positional references, can return negative values for $-n "deep" stack accesses. */ @@ -500,8 +437,8 @@ parse_ref (char *cp, symbol_list *rule, int rule_length, return num; else { - complain_at (text_loc, complaint, _("integer out of range: %s"), - quote (text)); + complain (&text_loc, complaint, _("integer out of range: %s"), + quote (text)); return INVALID_REF; } } @@ -589,32 +526,33 @@ parse_ref (char *cp, symbol_list *rule, int rule_length, cp_end - cp : ref_tail_fields - cp; unsigned indent = 0; - complain_at_indent (text_loc, complaint, &indent, - _("invalid reference: %s"), quote (text)); + complain_indent (&text_loc, complaint, &indent, + _("invalid reference: %s"), quote (text)); indent += SUB_INDENT; if (len == 0) { location sym_loc = text_loc; sym_loc.start.column += 1; sym_loc.end = sym_loc.start; - complain_at_indent (sym_loc, complaint, &indent, - _("syntax error after '%c', expecting integer, " - "letter, '_', '[', or '$'"), - dollar_or_at); + complain_indent (&sym_loc, complaint, &indent, + _("syntax error after '%c', expecting integer, " + "letter, '_', '[', or '$'"), + dollar_or_at); } else if (midrule_rhs_index) - complain_at_indent (rule->location, complaint, &indent, - _("symbol not found in production before $%d: " - "%.*s"), - midrule_rhs_index, len, cp); + complain_indent (&rule->location, complaint, &indent, + _("symbol not found in production before $%d: " + "%.*s"), + midrule_rhs_index, len, cp); else - complain_at_indent (rule->location, complaint, &indent, - _("symbol not found in production: %.*s"), - len, cp); + complain_indent (&rule->location, complaint, &indent, + _("symbol not found in production: %.*s"), + len, cp); if (variant_count > 0) - show_sub_messages (cp, explicit_bracketing, midrule_rhs_index, - dollar_or_at, complaint, indent); + show_sub_messages (complaint, + cp, explicit_bracketing, midrule_rhs_index, + dollar_or_at, indent); return INVALID_REF; } case 1: @@ -622,10 +560,11 @@ parse_ref (char *cp, symbol_list *rule, int rule_length, unsigned indent = 0; if (variant_count > 1) { - complain_at_indent (text_loc, Wother, &indent, - _("misleading reference: %s"), quote (text)); - show_sub_messages (cp, explicit_bracketing, midrule_rhs_index, - dollar_or_at, Wother, indent + SUB_INDENT); + complain_indent (&text_loc, Wother, &indent, + _("misleading reference: %s"), quote (text)); + show_sub_messages (Wother, + cp, explicit_bracketing, midrule_rhs_index, + dollar_or_at, indent + SUB_INDENT); } { unsigned symbol_index = @@ -637,16 +576,14 @@ parse_ref (char *cp, symbol_list *rule, int rule_length, default: { unsigned indent = 0; - complain_at_indent (text_loc, complaint, &indent, - _("ambiguous reference: %s"), quote (text)); - show_sub_messages (cp, explicit_bracketing, midrule_rhs_index, - dollar_or_at, complaint, indent + SUB_INDENT); + complain_indent (&text_loc, complaint, &indent, + _("ambiguous reference: %s"), quote (text)); + show_sub_messages (complaint, + cp, explicit_bracketing, midrule_rhs_index, + dollar_or_at, indent + SUB_INDENT); return INVALID_REF; } } - - /* Not reachable. */ - return INVALID_REF; } /* Keeps track of the maximum number of semantic values to the left of @@ -667,15 +604,16 @@ fetch_type_name (char *cp, char const **type_name, if (*cp == '<') { *type_name = ++cp; - while (*cp != '>') + /* Series of non-'>' or "->". */ + while (*cp != '>' || cp[-1] == '-') ++cp; /* The '>' symbol will be later replaced by '\0'. Original 'text' is needed for error messages. */ ++cp; if (untyped_var_seen) - complain_at (dollar_loc, complaint, - _("explicit type given in untyped grammar")); + complain (&dollar_loc, complaint, + _("explicit type given in untyped grammar")); tag_seen = true; } return cp; @@ -733,15 +671,15 @@ handle_action_dollar (symbol_list *rule, char *text, location dollar_loc) if (union_seen | tag_seen) { if (rule->midrule_parent_rule) - complain_at (dollar_loc, complaint, + complain (&dollar_loc, complaint, _("$$ for the midrule at $%d of %s" " has no declared type"), rule->midrule_parent_rhs_index, quote (effective_rule->content.sym->tag)); else - complain_at (dollar_loc, complaint, - _("$$ of %s has no declared type"), - quote (rule->content.sym->tag)); + complain (&dollar_loc, complaint, + _("$$ of %s has no declared type"), + quote (rule->content.sym->tag)); } else untyped_var_seen = true; @@ -762,9 +700,9 @@ handle_action_dollar (symbol_list *rule, char *text, location dollar_loc) if (!type_name) { if (union_seen | tag_seen) - complain_at (dollar_loc, complaint, - _("$%s of %s has no declared type"), cp, - quote (effective_rule->content.sym->tag)); + complain (&dollar_loc, complaint, + _("$%s of %s has no declared type"), cp, + quote (effective_rule->content.sym->tag)); else untyped_var_seen = true; } @@ -773,7 +711,7 @@ handle_action_dollar (symbol_list *rule, char *text, location dollar_loc) "]b4_rhs_value(%d, %d, ", effective_rule_length, n); obstack_quote (&obstack_for_string, type_name); obstack_sgrow (&obstack_for_string, ")["); - if (n > 0) + if (0 < n) symbol_list_n_get (effective_rule, n)->action_props.is_value_used = true; break;