X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/6cf3716c3166d6d41cdbeea45d018b1760184421..7c0d37283d6d2855cf4612e5bc9723cf5065970f:/data/lalr1.cc diff --git a/data/lalr1.cc b/data/lalr1.cc index b8334e83..7b2aef2d 100644 --- a/data/lalr1.cc +++ b/data/lalr1.cc @@ -22,7 +22,7 @@ m4_include(b4_pkgdatadir/[c++.m4]) # -------------------------------------------------------------- # Declare "parser::yy_" which contents is CONTENT. m4_define([b4_integral_parser_table_declare], -[m4_ifval([$3], [b4_c_comment([$3], [ ]) +[m4_ifval([$3], [b4_comment([$3], [ ]) ])dnl static const b4_int_type_for([$2]) yy$1_[[]];dnl ]) @@ -98,19 +98,19 @@ m4_define([b4_rhs_location], # Same as in C, but using references instead of pointers. m4_define([b4_symbol_action], [b4_symbol_if([$1], [has_$2], -[m4_pushdef([b4_dollar_dollar], - [b4_symbol_value_template([yysym.value], - b4_symbol_if([$1], [has_type], - [b4_symbol([$1], [type])]))])dnl -m4_pushdef([b4_at_dollar], [yysym.location])dnl +[m4_pushdef([b4_symbol_value], m4_defn([b4_symbol_value_template]))[]dnl +b4_dollar_pushdef([yysym.value], + b4_symbol_if([$1], [has_type], + [m4_dquote(b4_symbol([$1], [type]))]), + [yysym.location])dnl b4_symbol_case_([$1]) b4_syncline([b4_symbol([$1], [$2_line])], ["b4_symbol([$1], [$2_file])"]) b4_symbol([$1], [$2]) b4_syncline([@oline@], [@ofile@]) break; -m4_popdef([b4_at_dollar])dnl -m4_popdef([b4_dollar_dollar])dnl +m4_popdef([b4_symbol_value])[]dnl +b4_dollar_popdef[]dnl ])]) @@ -120,67 +120,36 @@ m4_pushdef([b4_copyright_years], m4_define([b4_parser_class_name], [b4_percent_define_get([[parser_class_name]])]) -# The header is mandatory. -b4_defines_if([], - [b4_fatal([b4_skeleton[: using %%defines is mandatory]])]) - -b4_locations_if([b4_percent_define_ifdef([[location_type]], [], - [# Backward compatibility. +b4_bison_locations_if([# Backward compatibility. m4_define([b4_location_constructors]) - m4_include(b4_pkgdatadir/[location.cc])])]) + m4_include(b4_pkgdatadir/[location.cc])]) m4_include(b4_pkgdatadir/[stack.hh]) b4_variant_if([m4_include(b4_pkgdatadir/[variant.hh])]) -# We do want M4 expansion after # for CPP macros. -m4_changecom() -m4_divert_push(0)dnl -@output(b4_spec_defines_file@)@ -b4_copyright([Skeleton interface for Bison LALR(1) parsers in C++]) -[ -/** - ** \file ]b4_spec_defines_file[ - ** Define the ]b4_namespace_ref[::parser class. - */ - -/* C++ LALR(1) parser skeleton written by Akim Demaille. */ - -]b4_cpp_guard_open([b4_spec_defines_file])[ - -]b4_percent_code_get([[requires]])[ - -]b4_parse_assert_if([#include ])[ -#include -#include -#include -#include "stack.hh" -]b4_locations_if([b4_percent_define_ifdef([[location_type]], [], - [[#include "location.hh"]])])[ - -]b4_variant_if([b4_namespace_open -b4_variant_define -b4_namespace_close])[ - -]b4_null_define[ - -/* Enabling traces. */ -#ifndef YYDEBUG -# define YYDEBUG ]b4_parse_trace_if([1], [0])[ -#endif +# b4_shared_declarations +# ---------------------- +# Declaration that might either go into the header (if --defines) +# or open coded in the parser body. +m4_define([b4_shared_declarations], +[b4_percent_code_get([[requires]])[ +]b4_parse_assert_if([# include ])[ +# include +# include +# include +# include ]b4_defines_if([[ +# include "stack.hh" +]b4_bison_locations_if([[# include "location.hh"]])])[ + +]b4_YYDEBUG_define[ -/* Enabling verbose error messages. */ -#ifdef YYERROR_VERBOSE -# undef YYERROR_VERBOSE -# define YYERROR_VERBOSE 1 -#else -# define YYERROR_VERBOSE ]b4_error_verbose_if([1], [0])[ -#endif +]b4_namespace_open[ -/* Enabling the token table. */ -#ifndef YYTOKEN_TABLE -# define YYTOKEN_TABLE ]b4_token_table[ -#endif +]b4_defines_if([], +[b4_stack_define +b4_bison_locations_if([b4_position_define +b4_location_define])])[ -]b4_namespace_open[ +]b4_variant_if([b4_variant_define])[ /// A Bison parser. class ]b4_parser_class_name[ @@ -195,7 +164,7 @@ b4_namespace_close])[ /// \returns 0 iff parsing succeeded. virtual int parse (); -#if YYDEBUG +#if ]b4_api_PREFIX[DEBUG /// The current debugging stream. std::ostream& debug_stream () const; /// Set the current debugging stream. @@ -209,10 +178,10 @@ b4_namespace_close])[ void set_debug_level (debug_level_type l); #endif - /// Report a syntax error.]b4_locations_if([ - /// \param loc where the syntax error is found.])[ + /// Report a syntax error.]b4_locations_if([[ + /// \param loc where the syntax error is found.]])[ /// \param msg a description of the syntax error. - virtual void error (]b4_locations_if([const location_type& loc, ])[const std::string& msg); + virtual void error (]b4_locations_if([[const location_type& loc, ]])[const std::string& msg); /// Report a syntax error. void error (const syntax_error& err); @@ -244,18 +213,16 @@ b4_namespace_close])[ static const ]b4_int_type(b4_pact_ninf, b4_pact_ninf)[ yypact_ninf_; static const ]b4_int_type(b4_table_ninf, b4_table_ninf)[ yytable_ninf_; - /* Tables. */ -]b4_parser_tables_declare[ - -#if YYDEBUG || YYERROR_VERBOSE || YYTOKEN_TABLE - /// For a symbol, its name in clear. - static const char* const yytname_[]; -#endif]b4_error_verbose_if([ + // Tables. +]b4_parser_tables_declare[]b4_error_verbose_if([ /// Convert the symbol name \a n to a form suitable for a diagnostic. static std::string yytnamerr_ (const char *n);])[ -#if YYDEBUG +]b4_token_table_if([], [[#if ]b4_api_PREFIX[DEBUG]])[ + /// For a symbol, its name in clear. + static const char* const yytname_[]; +]b4_token_table_if([[#if ]b4_api_PREFIX[DEBUG]])[ ]b4_integral_parser_table_declare([rline], [b4_rline], [YYRLINE[YYN] -- Source line where rule number YYN was defined.])[ /// Report on the debug stream that the rule \a r is going to be reduced. @@ -263,15 +230,15 @@ b4_namespace_close])[ /// Print the state stack on the debug stream. virtual void yystack_print_ (); - /* Debugging. */ + // Debugging. int yydebug_; std::ostream* yycdebug_; -#endif +#endif // ]b4_api_PREFIX[DEBUG /// Convert a scanner token number \a t to a symbol number. - static inline token_number_type yytranslate_ (]b4_lex_symbol_if([token_type], [int])[ t); + static inline token_number_type yytranslate_ (]b4_token_ctor_if([token_type], [int])[ t); -#if YYDEBUG +#if ]b4_api_PREFIX[DEBUG /// \brief Display a symbol type, value and location. /// \param yyo The output stream. /// \param yysym The symbol. @@ -299,7 +266,7 @@ b4_namespace_close])[ inline stack_symbol_type (); /// Constructor. - inline stack_symbol_type (]b4_args([state_type s], + inline stack_symbol_type (]b4_join([state_type s], [const semantic_type& v], b4_locations_if([const location_type& l]))[); @@ -350,21 +317,40 @@ b4_namespace_close])[ ]b4_parse_param_vars[ }; -]b4_lex_symbol_if([b4_yytranslate_define +]b4_token_ctor_if([b4_yytranslate_define b4_public_types_define])[ ]b4_namespace_close[ ]b4_percent_define_flag_if([[global_tokens_and_yystype]], -[b4_token_defines(b4_tokens) +[b4_token_defines -#ifndef YYSTYPE +#ifndef ]b4_api_PREFIX[STYPE /* Redirection for backward compatibility. */ -# define YYSTYPE b4_namespace_ref::b4_parser_class_name::semantic_type +# define ]b4_api_PREFIX[STYPE b4_namespace_ref::b4_parser_class_name::semantic_type #endif ])[ ]b4_percent_code_get([[provides]])[ +]]) + +b4_defines_if( +[b4_output_begin([b4_spec_defines_file]) +b4_copyright([Skeleton interface for Bison LALR(1) parsers in C++]) +[ +/** + ** \file ]b4_spec_defines_file[ + ** Define the ]b4_namespace_ref[::parser class. + */ + +/* C++ LALR(1) parser skeleton written by Akim Demaille. */ + +]b4_cpp_guard_open([b4_spec_defines_file])[ +]b4_shared_declarations[ ]b4_cpp_guard_close([b4_spec_defines_file]) -@output(b4_parser_file_name@)@ +b4_output_end() +]) + + +b4_output_begin([b4_parser_file_name]) b4_copyright([Skeleton implementation for Bison LALR(1) parsers in C++]) b4_percent_code_get([[top]])[]dnl m4_if(b4_prefix, [yy], [], @@ -372,16 +358,19 @@ m4_if(b4_prefix, [yy], [], // Take the name prefix into account. #define yylex b4_prefix[]lex])[ -/* First part of user declarations. */ +// First part of user declarations. ]b4_user_pre_prologue[ -#include "@basename(]b4_spec_defines_file[@)" +]b4_null_define[ + +]b4_defines_if([[#include "@basename(]b4_spec_defines_file[@)"]], + [b4_shared_declarations])[ /* User implementation prologue. */ -]b4_user_post_prologue -b4_percent_code_get[]dnl +]b4_user_post_prologue[ +]b4_percent_code_get[ -[#ifndef YY_ +#ifndef YY_ # if defined YYENABLE_NLS && YYENABLE_NLS # if ENABLE_NLS # include /* FIXME: INFRINGES ON USER NAME SPACE */ @@ -394,31 +383,14 @@ b4_percent_code_get[]dnl #endif ]b4_locations_if([dnl -[/* YYLLOC_DEFAULT -- Set CURRENT to span from RHS[1] to RHS[N]. - If N is 0, then set CURRENT to the empty location which ends - the previous symbol: RHS[0] (always defined). */ - -#define YYRHSLOC(Rhs, K) ((Rhs)[K].location) -#ifndef YYLLOC_DEFAULT -# define YYLLOC_DEFAULT(Current, Rhs, N) \ - do \ - if (N) \ - { \ - (Current).begin = YYRHSLOC (Rhs, 1).begin; \ - (Current).end = YYRHSLOC (Rhs, N).end; \ - } \ - else \ - { \ - (Current).begin = (Current).end = YYRHSLOC (Rhs, 0).end; \ - } \ - while (false) -#endif]])[ +[#define YYRHSLOC(Rhs, K) ((Rhs)[K].location) +]b4_yylloc_default_define])[ /* Suppress unused-variable warnings by "using" E. */ #define YYUSE(e) ((void) (e)) /* Enable debugging if requested. */ -#if YYDEBUG +#if ]b4_api_PREFIX[DEBUG /* A pseudo ostream that takes yydebug_ into account. */ # define YYCDEBUG if (yydebug_) (*yycdebug_) @@ -445,14 +417,14 @@ b4_percent_code_get[]dnl yystack_print_ (); \ } while (false) -#else /* !YYDEBUG */ +#else /* !]b4_api_PREFIX[DEBUG */ # define YYCDEBUG if (false) std::cerr # define YY_SYMBOL_PRINT(Title, Symbol) YYUSE(Symbol) # define YY_REDUCE_PRINT(Rule) static_cast(0) # define YY_STACK_PRINT() static_cast(0) -#endif /* !YYDEBUG */ +#endif /* !]b4_api_PREFIX[DEBUG */ #define yyerrok (yyerrstatus_ = 0) #define yyclearin (yyempty = true) @@ -505,7 +477,7 @@ b4_percent_code_get[]dnl /// Build a parser object. ]b4_parser_class_name::b4_parser_class_name[ (]b4_parse_param_decl[)]m4_ifset([b4_parse_param], [ :])[ -#if YYDEBUG +#if ]b4_api_PREFIX[DEBUG ]m4_ifset([b4_parse_param], [ ], [ :])[yydebug_ (false), yycdebug_ (&std::cerr)]m4_ifset([b4_parse_param], [,])[ #endif]b4_parse_param_cons[ @@ -521,7 +493,7 @@ b4_percent_code_get[]dnl | Symbol types. | `---------------*/ -]b4_lex_symbol_if([], [b4_public_types_define])[ +]b4_token_ctor_if([], [b4_public_types_define])[ // stack_symbol_type. ]b4_parser_class_name[::stack_symbol_type::stack_symbol_type () @@ -530,7 +502,7 @@ b4_percent_code_get[]dnl { } - ]b4_parser_class_name[::stack_symbol_type::stack_symbol_type (]b4_args( + ]b4_parser_class_name[::stack_symbol_type::stack_symbol_type (]b4_join( [state_type s], [const semantic_type& v], b4_locations_if([const location_type& l]))[) @@ -567,7 +539,7 @@ b4_percent_code_get[]dnl b4_symbol_variant([[yytype]], [[yysym.value]], [[template destroy]])])[ } -#if YYDEBUG +#if ]b4_api_PREFIX[DEBUG template void ]b4_parser_class_name[::yy_print_ (std::ostream& yyo, @@ -596,13 +568,13 @@ b4_percent_code_get[]dnl if (m) YY_SYMBOL_PRINT (m, sym); ]b4_variant_if( -[[ yystack_.push (stack_symbol_type (]b4_args( +[[ yystack_.push (stack_symbol_type (]b4_join( [s], [semantic_type()], b4_locations_if([sym.location]))[)); ]b4_symbol_variant([[yystos_[s]]], [[yystack_[0].value]], [build], [sym.value])], -[[ yystack_.push (stack_symbol_type (]b4_args( +[[ yystack_.push (stack_symbol_type (]b4_join( [s], [sym.value], b4_locations_if([sym.location]))[));]])[ @@ -614,7 +586,7 @@ b4_percent_code_get[]dnl if (m) YY_SYMBOL_PRINT (m, s); ]b4_variant_if( -[[ yystack_.push (stack_symbol_type (]b4_args( +[[ yystack_.push (stack_symbol_type (]b4_join( [s.state], [semantic_type()], b4_locations_if([s.location]))[)); @@ -629,7 +601,7 @@ b4_percent_code_get[]dnl yystack_.pop (n); } -#if YYDEBUG +#if ]b4_api_PREFIX[DEBUG std::ostream& ]b4_parser_class_name[::debug_stream () const { @@ -654,7 +626,7 @@ b4_percent_code_get[]dnl { yydebug_ = l; } -#endif +#endif // ]b4_api_PREFIX[DEBUG inline ]b4_parser_class_name[::state_type ]b4_parser_class_name[::yy_lr_goto_state_ (state_type yystate, int yylhs) @@ -684,11 +656,11 @@ b4_percent_code_get[]dnl /// Whether yyla contains a lookahead. bool yyempty = true; - /* State. */ + // State. int yyn; int yylen = 0; - /* Error handling. */ + // Error handling. int yynerrs_ = 0; int yyerrstatus_ = 0; @@ -701,18 +673,20 @@ b4_percent_code_get[]dnl /// $$ and @@$. stack_symbol_type yylhs; - /// The return value of parse(). + /// The return value of parse (). int yyresult; + // FIXME: This shoud be completely indented. It is not yet to + // avoid gratuitous conflicts when merging into the master branch. + try + { YYCDEBUG << "Starting parse" << std::endl; ]m4_ifdef([b4_initial_action], [ -m4_pushdef([b4_at_dollar], [yyla.location])dnl -m4_pushdef([b4_dollar_dollar], [yyla.value])dnl +b4_dollar_pushdef([yyla.value], [], [yyla.location])dnl /* User initialization code. */ b4_user_initial_action -m4_popdef([b4_dollar_dollar])dnl -m4_popdef([b4_at_dollar])])dnl +b4_dollar_popdef])[]dnl [ /* Initialize the stack. The initial state will be set in yynewstate, since the latter expects the semantical and the @@ -744,20 +718,20 @@ m4_popdef([b4_at_dollar])])dnl { YYCDEBUG << "Reading a token: "; try - { -]b4_lex_symbol_if( -[ yyla = b4_c_function_call([yylex], [symbol_type], + { +]b4_token_ctor_if( +[ yyla = b4_function_call([yylex], [symbol_type], m4_ifdef([b4_lex_param], b4_lex_param));], -[ yyla.type = yytranslate_ (b4_c_function_call([yylex], [int], - [[YYSTYPE*], [&yyla.value]][]dnl +[ yyla.type = yytranslate_ (b4_function_call([yylex], [int], + [b4_api_PREFIX[STYPE*], [&yyla.value]][]dnl b4_locations_if([, [[location*], [&yyla.location]]])dnl m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[ - } + } catch (const syntax_error& yyexc) - { - error (yyexc); - goto yyerrlab1; - } + { + error (yyexc); + goto yyerrlab1; + } yyempty = false; } YY_SYMBOL_PRINT ("Next token is", yyla); @@ -830,19 +804,19 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[ // Perform the reduction. YY_REDUCE_PRINT (yyn); try - { - switch (yyn) { + switch (yyn) + { ]b4_user_actions[ - default: - break; + default: + break; + } } - } catch (const syntax_error& yyexc) - { - error (yyexc); - YYERROR; - } + { + error (yyexc); + YYERROR; + } YY_SYMBOL_PRINT ("-> $$ =", yylhs); ]b4_variant_if([[ // Destroy the rhs symbols. @@ -875,7 +849,7 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[ if (!yyerrstatus_) { ++yynerrs_; - error (]b4_args(b4_locations_if([yyla.location]), + error (]b4_join(b4_locations_if([yyla.location]), [[yysyntax_error_ (yystack_[0].state, yyempty ? yyempty_ : yyla.type)]])[); } @@ -978,7 +952,7 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[ /* Do not reclaim the symbols of the rule which action triggered this YYABORT or YYACCEPT. */ yypop_ (yylen); - while (yystack_.size () != 1) + while (1 < yystack_.size ()) { yy_destroy_ ("Cleanup: popping", yystack_[0]); yypop_ (); @@ -986,11 +960,28 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[ return yyresult; } + catch (...) + { + YYCDEBUG << "Exception caught: cleaning lookahead and stack" + << std::endl; + // Do not try to display the values of the reclaimed symbols, + // as their printer might throw an exception. + if (!yyempty) + yy_destroy_ (YY_NULL, yyla); + + while (1 < yystack_.size ()) + { + yy_destroy_ (YY_NULL, yystack_[0]); + yypop_ (); + } + throw; + } + } void ]b4_parser_class_name[::error (const syntax_error& yyexc) { - error (]b4_args(b4_locations_if([yyexc.location]), + error (]b4_join(b4_locations_if([yyexc.location]), [[yyexc.what()]])[); } @@ -1099,7 +1090,7 @@ b4_error_verbose_if([state_type yystate, int yytoken], ]b4_parser_tables_define[ -#if YYDEBUG || YYERROR_VERBOSE || YYTOKEN_TABLE +]b4_token_table_if([], [[#if ]b4_api_PREFIX[DEBUG]])[ /* YYTNAME[SYMBOL-NUM] -- String name of the symbol SYMBOL-NUM. First, the terminals, then, starting at \a yyntokens_, nonterminals. */ const char* @@ -1107,9 +1098,8 @@ b4_error_verbose_if([state_type yystate, int yytoken], { ]b4_tname[ }; -#endif -#if YYDEBUG +]b4_token_table_if([[#if ]b4_api_PREFIX[DEBUG]])[ ]b4_integral_parser_table_define([rline], [b4_rline])[ // Print the state stack on the debug stream. @@ -1139,10 +1129,12 @@ b4_error_verbose_if([state_type yystate, int yytoken], YY_SYMBOL_PRINT (" $" << yyi + 1 << " =", ]b4_rhs_data(yynrhs, yyi + 1)[); } -#endif // YYDEBUG +#endif // ]b4_api_PREFIX[DEBUG -]b4_lex_symbol_if([], [b4_yytranslate_define])[ +]b4_token_ctor_if([], [b4_yytranslate_define])[ ]b4_namespace_close[ ]b4_epilogue[]dnl -m4_divert_pop(0) +b4_output_end() + + m4_popdef([b4_copyright_years])dnl