X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/4c56b1319df6e3218bfb1b1f756c7de0b8316ebb..041308d0c03783c51ef362f888c957cd2a0e129a:/src/scan-code.l diff --git a/src/scan-code.l b/src/scan-code.l index 0cf1cbd3..5bcb5686 100644 --- a/src/scan-code.l +++ b/src/scan-code.l @@ -1,6 +1,6 @@ /* Bison Action Scanner -*- C -*- - Copyright (C) 2006, 2007, 2008-2009 Free Software Foundation, Inc. + Copyright (C) 2006-2012 Free Software Foundation, Inc. This file is part of Bison, the GNU Compiler Compiler. @@ -84,8 +84,8 @@ splice (\\[ \f\t\v]*\n)* /* C style identifier. Must start with letter. Will be used for named symbol references. Shall be kept synchronized with scan-gram.l "letter" and "id". */ -letter [-.abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_] -id {letter}({letter}|[0-9])* +letter [.abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_] +id {letter}({letter}|[-0-9])* ref -?[0-9]+|{id}|"["{id}"]"|"$" %% @@ -95,10 +95,10 @@ ref -?[0-9]+|{id}|"["{id}"]"|"$" int braces_level = 0; /* Whether a semicolon is probably needed. - The heuristic is that a semicolon is not needed after `{', `}', `;', + 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 `{}'. + Note that '{' does not need a semicolon because of '{}'. A semicolon may be needed before a cpp direcive, but don't bother. */ bool need_semicolon = false; @@ -117,7 +117,7 @@ ref -?[0-9]+|{id}|"["{id}"]"|"$" %} /*------------------------------------------------------------. - | Scanning a C comment. The initial `/ *' is already eaten. | + | Scanning a C comment. The initial '/ *' is already eaten. | `------------------------------------------------------------*/ @@ -127,7 +127,7 @@ ref -?[0-9]+|{id}|"["{id}"]"|"$" /*--------------------------------------------------------------. - | Scanning a line comment. The initial `//' is already eaten. | + | Scanning a line comment. The initial '//' is already eaten. | `--------------------------------------------------------------*/ @@ -197,12 +197,12 @@ ref -?[0-9]+|{id}|"["{id}"]"|"$" need_semicolon = true; } "$" { - warn_at (*loc, _("stray `$'")); + warn_at (*loc, _("stray '$'")); obstack_sgrow (&obstack_for_string, "$]["); need_semicolon = true; } "@" { - warn_at (*loc, _("stray `@'")); + warn_at (*loc, _("stray '@'")); obstack_sgrow (&obstack_for_string, "@@"); need_semicolon = true; } @@ -220,16 +220,16 @@ ref -?[0-9]+|{id}|"["{id}"]"|"$" "}" { bool outer_brace = --braces_level == 0; - /* As an undocumented Bison extension, append `;' before the last + /* 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 + ';'. 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) { - warn_at (*loc, _("a `;' might be needed at the end of action code")); - warn_at (*loc, _("future versions of Bison will not add the `;'")); - obstack_1grow (&obstack_for_string, ';'); + warn_at (*loc, _("a ';' might be needed at the end of action code")); + warn_at (*loc, _("future versions of Bison will not add the ';'")); + obstack_1grow (&obstack_for_string, ';'); } STRING_GROW; @@ -238,14 +238,27 @@ ref -?[0-9]+|{id}|"["{id}"]"|"$" /* 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. */ + '#' 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; + [\n\r] STRING_GROW; if (in_cpp) in_cpp = need_semicolon = false; [ \t\f] STRING_GROW; - . STRING_GROW; need_semicolon = true; + + /* YYFAIL is undocumented and was formally deprecated in Bison + 2.4.2. */ + YYFAIL { + STRING_GROW; need_semicolon = true; + warn_at (*loc, _("use of YYFAIL, which is deprecated and will be" + " removed")); + } + + /* The sole purpose of this is to make sure identifiers that merely + contain YYFAIL don't produce the above warning. */ + [A-Za-z_][0-9A-Za-z_]* STRING_GROW; need_semicolon = true; + + . STRING_GROW; need_semicolon = true; } @@ -409,7 +422,8 @@ get_at_spec(unsigned symbol_index) static void show_sub_messages (const char* cp, bool explicit_bracketing, - int midrule_rhs_index, char dollar_or_at, bool is_warning) + int midrule_rhs_index, char dollar_or_at, + bool is_warning, unsigned indent) { unsigned i; @@ -421,11 +435,11 @@ show_sub_messages (const char* cp, bool explicit_bracketing, if (var->err == 0) { if (is_warning) - warn_at (var->loc, _(" refers to: %c%s at %s"), - dollar_or_at, var->id, at_spec); + warn_at_indent (var->loc, &indent, _("refers to: %c%s at %s"), + dollar_or_at, var->id, at_spec); else - complain_at (var->loc, _(" refers to: %c%s at %s"), - dollar_or_at, var->id, at_spec); + complain_at_indent (var->loc, &indent, _("refers to: %c%s at %s"), + dollar_or_at, var->id, at_spec); } else { @@ -440,7 +454,7 @@ show_sub_messages (const char* cp, bool explicit_bracketing, /* Create the explanation message. */ obstack_init (&msg_buf); - obstack_fgrow1 (&msg_buf, " possibly meant: %c", dollar_or_at); + obstack_fgrow1 (&msg_buf, _("possibly meant: %c"), dollar_or_at); if (contains_dot_or_dash (id)) obstack_fgrow1 (&msg_buf, "[%s]", id); else @@ -449,7 +463,7 @@ show_sub_messages (const char* cp, bool explicit_bracketing, if (var->err & VARIANT_HIDDEN) { - obstack_fgrow1 (&msg_buf, ", hiding %c", dollar_or_at); + obstack_fgrow1 (&msg_buf, _(", hiding %c"), dollar_or_at); if (contains_dot_or_dash (var->id)) obstack_fgrow1 (&msg_buf, "[%s]", var->id); else @@ -457,17 +471,22 @@ show_sub_messages (const char* cp, bool explicit_bracketing, obstack_sgrow (&msg_buf, tail); } - obstack_fgrow1 (&msg_buf, " at %s", at_spec); + obstack_fgrow1 (&msg_buf, _(" at %s"), at_spec); if (var->err & VARIANT_NOT_VISIBLE_FROM_MIDRULE) - obstack_fgrow1 (&msg_buf, ", cannot be accessed from " - "mid-rule action at $%d", midrule_rhs_index); + { + const char *format = + _(", cannot be accessed from mid-rule action at $%d"); + obstack_fgrow1 (&msg_buf, format, midrule_rhs_index); + } obstack_1grow (&msg_buf, '\0'); if (is_warning) - warn_at (id_loc, _("%s"), (char *) obstack_finish (&msg_buf)); + warn_at_indent (id_loc, &indent, "%s", + (char *) obstack_finish (&msg_buf)); else - complain_at (id_loc, _("%s"), (char *) obstack_finish (&msg_buf)); + complain_at_indent (id_loc, &indent, "%s", + (char *) obstack_finish (&msg_buf)); obstack_free (&msg_buf, 0); } } @@ -481,6 +500,9 @@ 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. */ @@ -593,29 +615,50 @@ parse_ref (char *cp, symbol_list *rule, int rule_length, { unsigned len = (explicit_bracketing || !ref_tail_fields) ? cp_end - cp : ref_tail_fields - cp; - const char *message = "symbol not found in production"; + unsigned indent = 0; - complain_at (text_loc, _("invalid reference: %s"), quote (text)); - if (midrule_rhs_index) - complain_at (rule->location, _(" %s before $%d: %.*s"), - message, midrule_rhs_index, len, cp); + complain_at_indent (text_loc, &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; + const char *format = + _("syntax error after '%c', expecting integer, letter," + " '_', '[', or '$'"); + complain_at_indent (sym_loc, &indent, format, dollar_or_at); + } + else if (midrule_rhs_index) + { + const char *format = + _("symbol not found in production before $%d: %.*s"); + complain_at_indent (rule->location, &indent, format, + midrule_rhs_index, len, cp); + } else - complain_at (rule->location, _(" %s: %.*s"), - message, len, cp); + { + const char *format = + _("symbol not found in production: %.*s"); + complain_at_indent (rule->location, &indent, format, + len, cp); + } if (variant_count > 0) show_sub_messages (cp, explicit_bracketing, midrule_rhs_index, - dollar_or_at, false); + dollar_or_at, false, indent); return INVALID_REF; } case 1: { + unsigned indent = 0; if (variant_count > 1) { - warn_at (text_loc, _("misleading reference: %s"), - quote (text)); + warn_at_indent (text_loc, &indent, _("misleading reference: %s"), + quote (text)); show_sub_messages (cp, explicit_bracketing, midrule_rhs_index, - dollar_or_at, true); + dollar_or_at, true, indent + SUB_INDENT); } { unsigned symbol_index = @@ -625,11 +668,14 @@ parse_ref (char *cp, symbol_list *rule, int rule_length, } case 2: default: - complain_at (text_loc, _("ambiguous reference: %s"), - quote (text)); - show_sub_messages (cp, explicit_bracketing, midrule_rhs_index, - dollar_or_at, false); - return INVALID_REF; + { + unsigned indent = 0; + complain_at_indent (text_loc, &indent, _("ambiguous reference: %s"), + quote (text)); + show_sub_messages (cp, explicit_bracketing, midrule_rhs_index, + dollar_or_at, false, indent + SUB_INDENT); + return INVALID_REF; + } } /* Not reachable. */ @@ -643,7 +689,7 @@ int max_left_semantic_context = 0; /*------------------------------------------------------------------. -| TEXT is pointing to a wannabee semantic value (i.e., a `$'). | +| TEXT is pointing to a wannabee semantic value (i.e., a '$'). | | | | Possible inputs: $[]($|integer) | | | @@ -703,23 +749,23 @@ handle_action_dollar (symbol_list *rule, char *text, location dollar_loc) type_name = symbol_list_n_type_name_get (rule, dollar_loc, 0); if (!type_name) - { - if (union_seen | tag_seen) - { - if (rule->midrule_parent_rule) - complain_at (dollar_loc, - _("$$ for the midrule at $%d of `%s'" - " has no declared type"), - rule->midrule_parent_rhs_index, - effective_rule->content.sym->tag); - else - complain_at (dollar_loc, _("$$ of `%s' has no declared type"), - rule->content.sym->tag); - } - else - untyped_var_seen = true; - type_name = ""; - } + { + if (union_seen | tag_seen) + { + if (rule->midrule_parent_rule) + complain_at (dollar_loc, + _("$$ 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, _("$$ of %s has no declared type"), + quote (rule->content.sym->tag)); + } + else + untyped_var_seen = true; + type_name = ""; + } obstack_fgrow1 (&obstack_for_string, "]b4_lhs_value([%s])[", type_name); @@ -733,14 +779,14 @@ handle_action_dollar (symbol_list *rule, char *text, location dollar_loc) type_name = symbol_list_n_type_name_get (effective_rule, dollar_loc, n); if (!type_name) - { - if (union_seen | tag_seen) - complain_at (dollar_loc, _("$%s of `%s' has no declared type"), - cp, effective_rule->content.sym->tag); - else - untyped_var_seen = true; - type_name = ""; - } + { + if (union_seen | tag_seen) + complain_at (dollar_loc, _("$%s of %s has no declared type"), + cp, quote (effective_rule->content.sym->tag)); + else + untyped_var_seen = true; + type_name = ""; + } obstack_fgrow3 (&obstack_for_string, "]b4_rhs_value(%d, %d, [%s])[", @@ -754,7 +800,7 @@ handle_action_dollar (symbol_list *rule, char *text, location dollar_loc) /*------------------------------------------------------. -| TEXT is a location token (i.e., a `@...'). Output to | +| TEXT is a location token (i.e., a '@...'). Output to | | OBSTACK_FOR_STRING a reference to this location. | `------------------------------------------------------*/