X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/1979121c96ed6ae55afd2e331b30345000afa780..b55b68608ff93cede27113663c6c0b0c82539ebc:/data/lalr1.java diff --git a/data/lalr1.java b/data/lalr1.java index f09667c2..7a0ace41 100644 --- a/data/lalr1.java +++ b/data/lalr1.java @@ -1,6 +1,6 @@ # Java skeleton for Bison -*- autoconf -*- -# Copyright (C) 2007, 2008 Free Software Foundation, Inc. +# Copyright (C) 2007-2011 Free Software Foundation, Inc. # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by @@ -17,15 +17,23 @@ m4_include(b4_pkgdatadir/[java.m4]) -b4_defines_if([b4_fatal([%s: %%defines does not make sense in Java], [b4_skeleton])]) -m4_ifval(m4_defn([b4_symbol_destructors]), - [b4_fatal([%s: %%destructor does not make sense in Java], [b4_skeleton])], - []) +b4_defines_if([b4_fatal([%s: %%defines does not make sense in Java], + [b4_skeleton])]) + +# We don't depend on %debug in Java, but pacify warnings about non-used flags. +b4_parse_trace_if([0], [0]) + +m4_define([b4_symbol_no_destructor_assert], +[b4_symbol_if([$1], [has_destructor], + [b4_fatal([%s: %s: %%destructor does not make sense in Java], + [b4_skeleton], + [b4_symbol_action_location([$1], [destructor])])])]) +b4_symbol_foreach([b4_symbol_no_destructor_assert]) m4_divert_push(0)dnl @output(b4_parser_file_name@)@ b4_copyright([Skeleton implementation for Bison LALR(1) parsers in Java], - [2007, 2008]) + [2007-2011]) b4_percent_define_ifdef([package], [package b4_percent_define_get([package]); ])[/* First part of user declarations. */ @@ -112,7 +120,7 @@ b4_locations_if([[ private ]b4_location_type[ yylloc (YYStack rhs, int n) { if (n > 0) - return new ]b4_location_type[ (rhs.locationAt (1).begin, rhs.locationAt (n).end); + return new ]b4_location_type[ (rhs.locationAt (n-1).begin, rhs.locationAt (0).end); else return new ]b4_location_type[ (rhs.locationAt (0).end); }]])[ @@ -264,24 +272,24 @@ b4_lexer_if([[ public int height = -1; public final void push (int state, ]b4_yystype[ value]dnl - b4_locations_if([, ]b4_location_type[ loc])[) { + b4_locations_if([, ]b4_location_type[ loc])[) { height++; if (size == height) { - int[] newStateStack = new int[size * 2]; - System.arraycopy (stateStack, 0, newStateStack, 0, height); - stateStack = newStateStack; - ]b4_locations_if([[ - ]b4_location_type[[] newLocStack = new ]b4_location_type[[size * 2]; - System.arraycopy (locStack, 0, newLocStack, 0, height); - locStack = newLocStack;]]) - - b4_yystype[[] newValueStack = new ]b4_yystype[[size * 2]; - System.arraycopy (valueStack, 0, newValueStack, 0, height); - valueStack = newValueStack; - - size *= 2; - } + int[] newStateStack = new int[size * 2]; + System.arraycopy (stateStack, 0, newStateStack, 0, height); + stateStack = newStateStack; + ]b4_locations_if([[ + ]b4_location_type[[] newLocStack = new ]b4_location_type[[size * 2]; + System.arraycopy (locStack, 0, newLocStack, 0, height); + locStack = newLocStack;]]) + + b4_yystype[[] newValueStack = new ]b4_yystype[[size * 2]; + System.arraycopy (valueStack, 0, newValueStack, 0, height); + valueStack = newValueStack; + + size *= 2; + } stateStack[height] = state; ]b4_locations_if([[locStack[height] = loc;]])[ @@ -289,14 +297,14 @@ b4_lexer_if([[ } public final void pop () { - height--; + pop (1); } public final void pop (int num) { // Avoid memory leaks... garbage collection is a white lie! if (num > 0) { - java.util.Arrays.fill (valueStack, height - num + 1, height, null); - ]b4_locations_if([[java.util.Arrays.fill (locStack, height - num + 1, height, null);]])[ + java.util.Arrays.fill (valueStack, height - num + 1, height + 1, null); + ]b4_locations_if([[java.util.Arrays.fill (locStack, height - num + 1, height + 1, null);]])[ } height -= num; } @@ -318,10 +326,10 @@ b4_lexer_if([[ { out.print ("Stack now"); - for (int i = 0; i < height; i++) + for (int i = 0; i <= height; i++) { - out.print (' '); - out.print (stateStack[i]); + out.print (' '); + out.print (stateStack[i]); } out.println (); } @@ -342,11 +350,9 @@ b4_lexer_if([[ * printing an error message. */ public static final int YYERROR = 2; - /** - * Returned by a Bison action in order to print an error message and start - * error recovery. */ - public static final int YYFAIL = 3; - + // Internal return codes that are not supported for user semantic + // actions. + private static final int YYERRLAB = 3; private static final int YYNEWSTATE = 4; private static final int YYDEFAULT = 5; private static final int YYREDUCE = 6; @@ -384,8 +390,8 @@ b4_lexer_if([[ switch (yyn) { - ]b4_user_actions[ - default: break; + ]b4_user_actions[ + default: break; } yy_symbol_print ("-> $$ =", yyr1_[yyn], yyval]b4_locations_if([, yyloc])[); @@ -397,7 +403,7 @@ b4_lexer_if([[ yyn = yyr1_[yyn]; int yystate = yypgoto_[yyn - yyntokens_] + yystack.stateAt (0); if (0 <= yystate && yystate <= yylast_ - && yycheck_[yystate] == yystack.stateAt (0)) + && yycheck_[yystate] == yystack.stateAt (0)) yystate = yytable_[yystate]; else yystate = yydefgoto_[yyn - yyntokens_]; @@ -425,7 +431,7 @@ b4_lexer_if([[ break strip_quotes; case '\\': - if (yystr.charAt(++i) != '\\') + if (yystr.charAt(++i) != '\\') break strip_quotes; /* Fall through. */ default: @@ -448,14 +454,14 @@ b4_lexer_if([[ `--------------------------------*/ private void yy_symbol_print (String s, int yytype, - ]b4_yystype[ yyvaluep]dnl - b4_locations_if([, Object yylocationp])[) + ]b4_yystype[ yyvaluep]dnl + b4_locations_if([, Object yylocationp])[) { if (yydebug > 0) yycdebug (s + (yytype < yyntokens_ ? " token " : " nterm ") - + yytname_[yytype] + " ("]b4_locations_if([ - + yylocationp + ": "])[ - + (yyvaluep == null ? "(null)" : yyvaluep.toString ()) + ")"); + + yytname_[yytype] + " ("]b4_locations_if([ + + yylocationp + ": "])[ + + (yyvaluep == null ? "(null)" : yyvaluep.toString ()) + ")"); } /** @@ -513,7 +519,7 @@ m4_popdef([b4_at_dollar])])dnl switch (label) { /* New state. Unlike in the C/C++ skeletons, the state is already - pushed when we come here. */ + pushed when we come here. */ case YYNEWSTATE: yycdebug ("Entering state " + yystate + "\n"); if (yydebug > 0) @@ -525,19 +531,19 @@ m4_popdef([b4_at_dollar])])dnl /* Take a decision. First try without lookahead. */ yyn = yypact_[yystate]; - if (yyn == yypact_ninf_) + if (yy_pact_value_is_default_ (yyn)) { label = YYDEFAULT; - break; + break; } /* Read a lookahead token. */ if (yychar == yyempty_) { - yycdebug ("Reading a token: "); - yychar = yylexer.yylex ();] + yycdebug ("Reading a token: "); + yychar = yylexer.yylex ();] b4_locations_if([[ - yylloc = new ]b4_location_type[(yylexer.getStartPos (), + yylloc = new ]b4_location_type[(yylexer.getStartPos (), yylexer.getEndPos ());]]) yylval = yylexer.getLVal ();[ } @@ -545,14 +551,14 @@ m4_popdef([b4_at_dollar])])dnl /* Convert token to internal form. */ if (yychar <= Lexer.EOF) { - yychar = yytoken = Lexer.EOF; - yycdebug ("Now at end of input.\n"); + yychar = yytoken = Lexer.EOF; + yycdebug ("Now at end of input.\n"); } else { - yytoken = yytranslate_ (yychar); - yy_symbol_print ("Next token is", yytoken, - yylval]b4_locations_if([, yylloc])[); + yytoken = yytranslate_ (yychar); + yy_symbol_print ("Next token is", yytoken, + yylval]b4_locations_if([, yylloc])[); } /* If the proper action on seeing token YYTOKEN is to reduce or to @@ -564,20 +570,20 @@ m4_popdef([b4_at_dollar])])dnl /* <= 0 means reduce or error. */ else if ((yyn = yytable_[yyn]) <= 0) { - if (yyn == 0 || yyn == yytable_ninf_) - label = YYFAIL; - else - { - yyn = -yyn; - label = YYREDUCE; - } + if (yy_table_value_is_error_ (yyn)) + label = YYERRLAB; + else + { + yyn = -yyn; + label = YYREDUCE; + } } else { /* Shift the lookahead token. */ - yy_symbol_print ("Shifting", yytoken, - yylval]b4_locations_if([, yylloc])[); + yy_symbol_print ("Shifting", yytoken, + yylval]b4_locations_if([, yylloc])[); /* Discard the token being shifted. */ yychar = yyempty_; @@ -599,7 +605,7 @@ m4_popdef([b4_at_dollar])])dnl case YYDEFAULT: yyn = yydefact_[yystate]; if (yyn == 0) - label = YYFAIL; + label = YYERRLAB; else label = YYREDUCE; break; @@ -610,18 +616,20 @@ m4_popdef([b4_at_dollar])])dnl case YYREDUCE: yylen = yyr2_[yyn]; label = yyaction (yyn, yystack, yylen); - yystate = yystack.stateAt (0); + yystate = yystack.stateAt (0); break; /*------------------------------------. | yyerrlab -- here on detecting error | `------------------------------------*/ - case YYFAIL: + case YYERRLAB: /* If not already recovering from an error, report this error. */ if (yyerrstatus_ == 0) { - ++yynerrs_; - yyerror (]b4_locations_if([yylloc, ])[yysyntax_error (yystate, yytoken)); + ++yynerrs_; + if (yychar == yyempty_) + yytoken = yyempty_; + yyerror (]b4_locations_if([yylloc, ])[yysyntax_error (yystate, yytoken)); } ]b4_locations_if([yyerrloc = yylloc;])[ @@ -637,7 +645,7 @@ m4_popdef([b4_at_dollar])])dnl return false; } else - yychar = yyempty_; + yychar = yyempty_; } /* Else will try to reuse lookahead token after shifting the error @@ -663,46 +671,46 @@ m4_popdef([b4_at_dollar])])dnl | yyerrlab1 -- common code for both syntax error and YYERROR. | `-------------------------------------------------------------*/ case YYERRLAB1: - yyerrstatus_ = 3; /* Each real token shifted decrements this. */ + yyerrstatus_ = 3; /* Each real token shifted decrements this. */ for (;;) { - yyn = yypact_[yystate]; - if (yyn != yypact_ninf_) - { - yyn += yyterror_; - if (0 <= yyn && yyn <= yylast_ && yycheck_[yyn] == yyterror_) - { - yyn = yytable_[yyn]; - if (0 < yyn) - break; - } - } - - /* Pop the current state because it cannot handle the error token. */ - if (yystack.height == 1) - return false; - - ]b4_locations_if([yyerrloc = yystack.locationAt (0);])[ - yystack.pop (); - yystate = yystack.stateAt (0); - if (yydebug > 0) - yystack.print (yyDebugStream); + yyn = yypact_[yystate]; + if (!yy_pact_value_is_default_ (yyn)) + { + yyn += yyterror_; + if (0 <= yyn && yyn <= yylast_ && yycheck_[yyn] == yyterror_) + { + yyn = yytable_[yyn]; + if (0 < yyn) + break; + } + } + + /* Pop the current state because it cannot handle the error token. */ + if (yystack.height == 1) + return false; + + ]b4_locations_if([yyerrloc = yystack.locationAt (0);])[ + yystack.pop (); + yystate = yystack.stateAt (0); + if (yydebug > 0) + yystack.print (yyDebugStream); } - ]b4_locations_if([ - /* Muck with the stack to setup for yylloc. */ - yystack.push (0, null, yylloc); - yystack.push (0, null, yyerrloc); + ]b4_locations_if([ + /* Muck with the stack to setup for yylloc. */ + yystack.push (0, null, yylloc); + yystack.push (0, null, yyerrloc); yyloc = yylloc (yystack, 2); - yystack.pop (2);])[ + yystack.pop (2);])[ /* Shift the error token. */ yy_symbol_print ("Shifting", yystos_[yyn], - yylval]b4_locations_if([, yyloc])[); + yylval]b4_locations_if([, yyloc])[); yystate = yyn; - yystack.push (yyn, yylval]b4_locations_if([, yyloc])[); + yystack.push (yyn, yylval]b4_locations_if([, yyloc])[); label = YYNEWSTATE; break; @@ -721,145 +729,111 @@ m4_popdef([b4_at_dollar])])dnl {]b4_error_verbose_if([[ if (yyErrorVerbose) { - int yyn = yypact_[yystate]; - if (yypact_ninf_ < yyn && yyn <= yylast_) + /* There are many possibilities here to consider: + - Assume YYFAIL is not used. It's too flawed to consider. + See + + for details. YYERROR is fine as it does not invoke this + function. + - If this state is a consistent state with a default action, + then the only way this function was invoked is if the + default action is an error action. In that case, don't + check for expected tokens because there are none. + - The only way there can be no lookahead present (in tok) is + if this state is a consistent state with a default action. + Thus, detecting the absence of a lookahead is sufficient to + determine that there is no unexpected or expected token to + report. In that case, just report a simple "syntax error". + - Don't assume there isn't a lookahead just because this + state is a consistent state with a default action. There + might have been a previous inconsistent state, consistent + state with a non-default action, or user semantic action + that manipulated yychar. (However, yychar is currently out + of scope during semantic actions.) + - Of course, the expected token list depends on states to + have correct lookahead information, and it depends on the + parser not to perform extra reductions after fetching a + lookahead from the scanner and before detecting a syntax + error. Thus, state merging (from LALR or IELR) and default + reductions corrupt the expected token list. However, the + list is correct for canonical LR with one exception: it + will still contain any token that will not be accepted due + to an error action in a later state. + */ + if (tok != yyempty_) { - StringBuffer res; - - /* Start YYX at -YYN if negative to avoid negative indexes in - YYCHECK. */ - int yyxbegin = yyn < 0 ? -yyn : 0; - - /* Stay within bounds of both yycheck and yytname. */ - int yychecklim = yylast_ - yyn + 1; - int yyxend = yychecklim < yyntokens_ ? yychecklim : yyntokens_; - int count = 0; - for (int x = yyxbegin; x < yyxend; ++x) - if (yycheck_[x + yyn] == x && x != yyterror_) - ++count; - - // FIXME: This method of building the message is not compatible - // with internationalization. - res = new StringBuffer ("syntax error, unexpected "); - res.append (yytnamerr_ (yytname_[tok])); - if (count < 5) - { - count = 0; - for (int x = yyxbegin; x < yyxend; ++x) - if (yycheck_[x + yyn] == x && x != yyterror_) - { - res.append (count++ == 0 ? ", expecting " : " or "); - res.append (yytnamerr_ (yytname_[x])); - } - } - return res.toString (); + // FIXME: This method of building the message is not compatible + // with internationalization. + StringBuffer res = + new StringBuffer ("syntax error, unexpected "); + res.append (yytnamerr_ (yytname_[tok])); + int yyn = yypact_[yystate]; + if (!yy_pact_value_is_default_ (yyn)) + { + /* Start YYX at -YYN if negative to avoid negative + indexes in YYCHECK. In other words, skip the first + -YYN actions for this state because they are default + actions. */ + int yyxbegin = yyn < 0 ? -yyn : 0; + /* Stay within bounds of both yycheck and yytname. */ + int yychecklim = yylast_ - yyn + 1; + int yyxend = yychecklim < yyntokens_ ? yychecklim : yyntokens_; + int count = 0; + for (int x = yyxbegin; x < yyxend; ++x) + if (yycheck_[x + yyn] == x && x != yyterror_ + && !yy_table_value_is_error_ (yytable_[x + yyn])) + ++count; + if (count < 5) + { + count = 0; + for (int x = yyxbegin; x < yyxend; ++x) + if (yycheck_[x + yyn] == x && x != yyterror_ + && !yy_table_value_is_error_ (yytable_[x + yyn])) + { + res.append (count++ == 0 ? ", expecting " : " or "); + res.append (yytnamerr_ (yytname_[x])); + } + } + } + return res.toString (); } } ]])[ return "syntax error"; } - /* YYPACT[STATE-NUM] -- Index in YYTABLE of the portion describing - STATE-NUM. */ - private static final ]b4_int_type_for([b4_pact])[ yypact_ninf_ = ]b4_pact_ninf[; - private static final ]b4_int_type_for([b4_pact])[ yypact_[] = - { - ]b4_pact[ - }; - - /* YYDEFACT[S] -- default rule to reduce with in state S when YYTABLE - doesn't specify something else to do. Zero means the default is an - error. */ - private static final ]b4_int_type_for([b4_defact])[ yydefact_[] = - { - ]b4_defact[ - }; - - /* YYPGOTO[NTERM-NUM]. */ - private static final ]b4_int_type_for([b4_pgoto])[ yypgoto_[] = + /** + * Whether the given yypact_ value indicates a defaulted state. + * @@param yyvalue the value to check + */ + private static boolean yy_pact_value_is_default_ (int yyvalue) { - ]b4_pgoto[ - }; + return yyvalue == yypact_ninf_; + } - /* YYDEFGOTO[NTERM-NUM]. */ - private static final ]b4_int_type_for([b4_defgoto])[ - yydefgoto_[] = + /** + * Whether the given yytable_ value indicates a syntax error. + * @@param yyvalue the value to check + */ + private static boolean yy_table_value_is_error_ (int yyvalue) { - ]b4_defgoto[ - }; + return yyvalue == yytable_ninf_; + } - /* YYTABLE[YYPACT[STATE-NUM]]. What to do in state STATE-NUM. If - positive, shift that token. If negative, reduce the rule which - number is the opposite. If zero, do what YYDEFACT says. */ + private static final ]b4_int_type_for([b4_pact])[ yypact_ninf_ = ]b4_pact_ninf[; private static final ]b4_int_type_for([b4_table])[ yytable_ninf_ = ]b4_table_ninf[; - private static final ]b4_int_type_for([b4_table])[ - yytable_[] = - { - ]b4_table[ - }; - - /* YYCHECK. */ - private static final ]b4_int_type_for([b4_check])[ - yycheck_[] = - { - ]b4_check[ - }; - - /* STOS_[STATE-NUM] -- The (internal number of the) accessing - symbol of state STATE-NUM. */ - private static final ]b4_int_type_for([b4_stos])[ - yystos_[] = - { - ]b4_stos[ - }; - - /* TOKEN_NUMBER_[YYLEX-NUM] -- Internal symbol number corresponding - to YYLEX-NUM. */ - private static final ]b4_int_type_for([b4_toknum])[ - yytoken_number_[] = - { - ]b4_toknum[ - }; - - /* YYR1[YYN] -- Symbol number of symbol that rule YYN derives. */ - private static final ]b4_int_type_for([b4_r1])[ - yyr1_[] = - { - ]b4_r1[ - }; - /* YYR2[YYN] -- Number of symbols composing right hand side of rule YYN. */ - private static final ]b4_int_type_for([b4_r2])[ - yyr2_[] = - { - ]b4_r2[ - }; + ]b4_parser_tables_define[ + ]b4_integral_parser_table_define([token_number], [b4_toknum], + [TOKEN_NUMBER_[YYLEX-NUM] -- Internal symbol number corresponding + to YYLEX-NUM.])[ /* YYTNAME[SYMBOL-NUM] -- String name of the symbol SYMBOL-NUM. First, the terminals, then, starting at \a yyntokens_, nonterminals. */ - private static final String yytname_[] = - { - ]b4_tname[ - }; + ]b4_typed_parser_table_define([String], [tname], [b4_tname])[ - /* YYRHS -- A `-1'-separated list of the rules' RHS. */ - private static final ]b4_int_type_for([b4_rhs])[ yyrhs_[] = - { - ]b4_rhs[ - }; - - /* YYPRHS[YYN] -- Index of the first RHS symbol of rule number YYN in - YYRHS. */ - private static final ]b4_int_type_for([b4_prhs])[ yyprhs_[] = - { - ]b4_prhs[ - }; - - /* YYRLINE[YYN] -- Source line where rule number YYN was defined. */ - private static final ]b4_int_type_for([b4_rline])[ yyrline_[] = - { - ]b4_rline[ - }; + ]b4_integral_parser_table_define([rline], [b4_rline], + [YYRLINE[YYN] -- Source line where rule number YYN was defined.])[ // Report on the debug stream that the rule yyrule is going to be reduced. private void yy_reduce_print (int yyrule, YYStack yystack) @@ -871,21 +845,18 @@ m4_popdef([b4_at_dollar])])dnl int yynrhs = yyr2_[yyrule]; /* Print the symbols being reduced, and their result. */ yycdebug ("Reducing stack by rule " + (yyrule - 1) - + " (line " + yylno + "), "); + + " (line " + yylno + "), "); /* The symbols being reduced. */ for (int yyi = 0; yyi < yynrhs; yyi++) yy_symbol_print (" $" + (yyi + 1) + " =", - yyrhs_[yyprhs_[yyrule] + yyi], - ]b4_rhs_value(yynrhs, yyi + 1)b4_locations_if([, - b4_rhs_location(yynrhs, yyi + 1)])[); + yystos_[yystack.stateAt(yyi + 1 - yynrhs)], + ]b4_rhs_value(yynrhs, yyi + 1)b4_locations_if([, + b4_rhs_location(yynrhs, yyi + 1)])[); } /* YYTRANSLATE(YYLEX) -- Bison symbol number corresponding to YYLEX. */ - private static final ]b4_int_type_for([b4_translate])[ yytranslate_table_[] = - { - ]b4_translate[ - }; + ]b4_integral_parser_table_define([translate_table], [b4_translate])[ private static final ]b4_int_type_for([b4_translate])[ yytranslate_ (int t) { @@ -911,5 +882,5 @@ b4_percent_code_get[]dnl } -b4_epilogue +b4_epilogue[]dnl m4_divert_pop(0)dnl