# Bison Regressions. -*- Autotest -*- # Copyright 2001 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 # the Free Software Foundation; either version 2, or (at your option) # any later version. # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # You should have received a copy of the GNU General Public License # along with this program; if not, write to the Free Software # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA # 02111-1307, USA. AT_BANNER([[Regression tests.]]) ## ------------------- ## ## %nonassoc and eof. ## ## ------------------- ## AT_SETUP([%nonassoc and eof]) AT_DATA([input.y], [[ %{ #include #define YYERROR_VERBOSE 1 #define yyerror(Msg) \ do { \ fprintf (stderr, "%s\n", Msg); \ exit (1); \ } while (0) /* The current argument. */ static const char *input = NULL; static int yylex (void) { /* No token stands for end of file. */ if (input && *input) return *input++; else return 0; } %} %nonassoc '<' '>' %% expr: expr '<' expr | expr '>' expr | '0' ; %% int main (int argc, const char *argv[]) { if (argc > 1) input = argv[1]; return yyparse (); } ]]) # Specify the output files to avoid problems on different file systems. AT_CHECK([bison input.y -o input.c]) AT_CHECK([$CC $CFLAGS $CPPFLAGS input.c -o input], 0, [], [ignore]) AT_CHECK([./input '0<0']) # FIXME: This is an actual bug, but a new one, in the sense that # no one has ever spotted it! The messages are *wrong*: there should # be nothing there, it should be expected eof. AT_CHECK([./input '0<0<0'], [1], [], [parse error, unexpected '<', expecting '<' or '>' ]) AT_CHECK([./input '0>0']) AT_CHECK([./input '0>0>0'], [1], [], [parse error, unexpected '>', expecting '<' or '>' ]) AT_CHECK([./input '0<0>0'], [1], [], [parse error, unexpected '>', expecting '<' or '>' ]) AT_CLEANUP ## ---------------- ## ## Braces parsing. ## ## ---------------- ## AT_SETUP([braces parsing]) AT_DATA([input.y], [[/* Bison used to swallow the character after `}'. */ %% exp: { tests = {{{{{{{{{{}}}}}}}}}}; } %% ]]) AT_CHECK([bison -v input.y -o input.c], 0, ignore, ignore) AT_CHECK([fgrep 'tests = {{{{{{{{{{}}}}}}}}}};' input.c], 0, [ignore]) AT_CLEANUP ## ------------------ ## ## Duplicate string. ## ## ------------------ ## AT_SETUP([Duplicate string]) AT_DATA([input.y], [[/* `Bison -v' used to dump core when two tokens are defined with the same string, as LE and GE below. */ %token NUM %token LE "<=" %token GE "<=" %% exp: '(' exp ')' | NUM ; %% ]]) AT_CHECK([bison -v input.y -o input.c], 0, ignore, ignore) AT_CLEANUP ## ------------------------- ## ## Unresolved SR Conflicts. ## ## ------------------------- ## AT_SETUP([Unresolved SR Conflicts]) AT_DATA([input.y], [[%token NUM OP %% exp: exp OP exp | NUM; ]]) AT_CHECK([bison input.y -o input.c -v], 0, [], [input.y contains 1 shift/reduce conflict. ]) # Check the contents of the report. AT_CHECK([cat input.output], [], [[State 5 contains 1 shift/reduce conflict. Grammar Number, Line, Rule 0 3 $axiom -> exp $ 1 3 exp -> exp OP exp 2 3 exp -> NUM Terminals, with rules where they appear $ (0) 0 error (256) NUM (257) 2 OP (258) 1 Nonterminals, with rules where they appear $axiom (5) on left: 0 exp (6) on left: 1 2, on right: 0 1 state 0 NUM shift, and go to state 1 exp go to state 2 state 1 exp -> NUM . (rule 2) $default reduce using rule 2 (exp) state 2 $axiom -> exp . $ (rule 0) exp -> exp . OP exp (rule 1) $ shift, and go to state 3 OP shift, and go to state 4 state 3 $axiom -> exp $ . (rule 0) $default accept state 4 exp -> exp OP . exp (rule 1) NUM shift, and go to state 1 exp go to state 5 state 5 exp -> exp . OP exp (rule 1) exp -> exp OP exp . (rule 1) OP shift, and go to state 4 OP [reduce using rule 1 (exp)] $default reduce using rule 1 (exp) ]]) AT_CLEANUP ## --------------------- ## ## Solved SR Conflicts. ## ## --------------------- ## AT_SETUP([Solved SR Conflicts]) AT_DATA([input.y], [[%token NUM OP %right OP %% exp: exp OP exp | NUM; ]]) AT_CHECK([bison input.y -o input.c -v], 0, [], []) # Check the contents of the report. AT_CHECK([cat input.output], [], [[Conflict in state 5 between rule 2 and token OP resolved as shift. Grammar Number, Line, Rule 0 4 $axiom -> exp $ 1 4 exp -> exp OP exp 2 4 exp -> NUM Terminals, with rules where they appear $ (0) 0 error (256) NUM (257) 2 OP (258) 1 Nonterminals, with rules where they appear $axiom (5) on left: 0 exp (6) on left: 1 2, on right: 0 1 state 0 NUM shift, and go to state 1 exp go to state 2 state 1 exp -> NUM . (rule 2) $default reduce using rule 2 (exp) state 2 $axiom -> exp . $ (rule 0) exp -> exp . OP exp (rule 1) $ shift, and go to state 3 OP shift, and go to state 4 state 3 $axiom -> exp $ . (rule 0) $default accept state 4 exp -> exp OP . exp (rule 1) NUM shift, and go to state 1 exp go to state 5 state 5 exp -> exp . OP exp (rule 1) exp -> exp OP exp . (rule 1) OP shift, and go to state 4 $default reduce using rule 1 (exp) ]]) AT_CLEANUP ## ------------------- ## ## Rule Line Numbers. ## ## ------------------- ## AT_SETUP([Rule Line Numbers]) AT_DATA([input.y], [[%% expr: 'a' { } 'b' { } | { } 'c' { } ]]) AT_CHECK([bison input.y -o input.c -v], 0, [], []) # Check the contents of the report. AT_CHECK([cat input.output], [], [[Grammar Number, Line, Rule 0 2 $axiom -> expr $ 1 2 @1 -> /* empty */ 2 2 expr -> 'a' @1 'b' 3 15 @2 -> /* empty */ 4 15 expr -> @2 'c' Terminals, with rules where they appear $ (0) 0 'a' (97) 2 'b' (98) 2 'c' (99) 4 error (256) Nonterminals, with rules where they appear $axiom (6) on left: 0 expr (7) on left: 2 4, on right: 0 @1 (8) on left: 1, on right: 2 @2 (9) on left: 3, on right: 4 state 0 'a' shift, and go to state 1 $default reduce using rule 3 (@2) expr go to state 2 @2 go to state 3 state 1 expr -> 'a' . @1 'b' (rule 2) $default reduce using rule 1 (@1) @1 go to state 4 state 2 $axiom -> expr . $ (rule 0) $ shift, and go to state 5 state 3 expr -> @2 . 'c' (rule 4) 'c' shift, and go to state 6 state 4 expr -> 'a' @1 . 'b' (rule 2) 'b' shift, and go to state 7 state 5 $axiom -> expr $ . (rule 0) $default accept state 6 expr -> @2 'c' . (rule 4) $default reduce using rule 4 (expr) state 7 expr -> 'a' @1 'b' . (rule 2) $default reduce using rule 2 (expr) ]]) AT_CLEANUP ## -------------------- ## ## %expect not enough. ## ## -------------------- ## AT_SETUP([%expect not enough]) AT_DATA([input.y], [[%token NUM OP %expect 0 %% exp: exp OP exp | NUM; ]]) AT_CHECK([bison input.y -o input.c], 1, [], [input.y contains 1 shift/reduce conflict. expected 0 shift/reduce conflicts ]) AT_CLEANUP ## --------------- ## ## %expect right. ## ## --------------- ## AT_SETUP([%expect right]) AT_DATA([input.y], [[%token NUM OP %expect 1 %% exp: exp OP exp | NUM; ]]) AT_CHECK([bison input.y -o input.c], 0) AT_CLEANUP ## ------------------ ## ## %expect too much. ## ## ------------------ ## AT_SETUP([%expect too much]) AT_DATA([input.y], [[%token NUM OP %expect 2 %% exp: exp OP exp | NUM; ]]) AT_CHECK([bison input.y -o input.c], 1, [], [input.y contains 1 shift/reduce conflict. expected 2 shift/reduce conflicts ]) AT_CLEANUP ## ---------------------- ## ## Mixing %token styles. ## ## ---------------------- ## AT_SETUP([Mixing %token styles]) # Taken from the documentation. AT_DATA([input.y], [[%token OR "||" %token LE 134 "<=" %left OR "<=" %% exp: ; %% ]]) AT_CHECK([bison -v input.y -o input.c], 0, ignore, ignore) AT_CLEANUP ## ---------------- ## ## Invalid inputs. ## ## ---------------- ## AT_SETUP([Invalid inputs]) AT_DATA([input.y], [[%% ? default: 'a' } %{ %& %a %- ]]) AT_CHECK([bison input.y], [1], [], [[input.y:2: invalid input: `?' input.y:3: invalid input: `}' input.y:4: invalid input: `%{' input.y:5: invalid input: `%&' input.y:6: invalid input: `%a' input.y:7: invalid input: `%-' ]]) AT_CLEANUP ## -------------------- ## ## Invalid %directive. ## ## -------------------- ## AT_SETUP([Invalid %directive]) AT_DATA([input.y], [[%invalid ]]) AT_CHECK([bison input.y], [1], [], [[input.y:1: unrecognized: %invalid input.y:1: Skipping to next % input.y:2: fatal error: no input grammar ]]) AT_CLEANUP ## -------------- ## ## Web2c Report. ## ## -------------- ## # The generation of the reduction was once wrong in Bison, and made it # miss some reductions. In the following test case, the reduction on # `undef_id_tok' in state 1 was missing. This is stripped down from # the actual web2c.y. AT_SETUP([Web2c Report]) AT_DATA([input.y], [[%token undef_id_tok const_id_tok %start CONST_DEC_PART %% CONST_DEC_PART: CONST_DEC_LIST ; CONST_DEC_LIST: CONST_DEC | CONST_DEC_LIST CONST_DEC ; CONST_DEC: { } undef_id_tok '=' const_id_tok ';' ; %% ]]) AT_CHECK([bison -v input.y]) AT_CHECK([sed -n 's/ *$//;/^$/!p' input.output], 0, [[Grammar Number, Line, Rule 0 6 $axiom -> CONST_DEC_PART $ 1 6 CONST_DEC_PART -> CONST_DEC_LIST 2 10 CONST_DEC_LIST -> CONST_DEC 3 12 CONST_DEC_LIST -> CONST_DEC_LIST CONST_DEC 4 15 @1 -> /* empty */ 5 15 CONST_DEC -> @1 undef_id_tok '=' const_id_tok ';' Terminals, with rules where they appear $ (0) 0 ';' (59) 5 '=' (61) 5 error (256) undef_id_tok (257) 5 const_id_tok (258) 5 Nonterminals, with rules where they appear $axiom (7) on left: 0 CONST_DEC_PART (8) on left: 1, on right: 0 CONST_DEC_LIST (9) on left: 2 3, on right: 1 3 CONST_DEC (10) on left: 5, on right: 2 3 @1 (11) on left: 4, on right: 5 state 0 $default reduce using rule 4 (@1) CONST_DEC_PART go to state 1 CONST_DEC_LIST go to state 2 CONST_DEC go to state 3 @1 go to state 4 state 1 $axiom -> CONST_DEC_PART . $ (rule 0) $ shift, and go to state 5 state 2 CONST_DEC_PART -> CONST_DEC_LIST . (rule 1) CONST_DEC_LIST -> CONST_DEC_LIST . CONST_DEC (rule 3) undef_id_tok reduce using rule 4 (@1) $default reduce using rule 1 (CONST_DEC_PART) CONST_DEC go to state 6 @1 go to state 4 state 3 CONST_DEC_LIST -> CONST_DEC . (rule 2) $default reduce using rule 2 (CONST_DEC_LIST) state 4 CONST_DEC -> @1 . undef_id_tok '=' const_id_tok ';' (rule 5) undef_id_tok shift, and go to state 7 state 5 $axiom -> CONST_DEC_PART $ . (rule 0) $default accept state 6 CONST_DEC_LIST -> CONST_DEC_LIST CONST_DEC . (rule 3) $default reduce using rule 3 (CONST_DEC_LIST) state 7 CONST_DEC -> @1 undef_id_tok . '=' const_id_tok ';' (rule 5) '=' shift, and go to state 8 state 8 CONST_DEC -> @1 undef_id_tok '=' . const_id_tok ';' (rule 5) const_id_tok shift, and go to state 9 state 9 CONST_DEC -> @1 undef_id_tok '=' const_id_tok . ';' (rule 5) ';' shift, and go to state 10 state 10 CONST_DEC -> @1 undef_id_tok '=' const_id_tok ';' . (rule 5) $default reduce using rule 5 (CONST_DEC) ]]) AT_CLEANUP ## --------------- ## ## Web2c Actions. ## ## --------------- ## # The generation of the mapping `state -> action' was once wrong in # extremely specific situations. web2c.y exhibits this situation. # Below is a stripped version of the grammar. It looks like one can # simplify it further, but just don't: it is tuned to exhibit a bug, # which disapears when applying sane grammar transformations. # # It used to be wrong on yydefact only: # # static const short yydefact[] = # { # - 2, 0, 1, 0, 0, 2, 3, 2, 5, 4, # + 2, 0, 1, 0, 0, 0, 3, 2, 5, 4, # 0, 0 # }; # # but let's check all the tables. AT_SETUP([Web2c Actions]) AT_DATA([input.y], [[%% statement: struct_stat; struct_stat: /* empty. */ | if else; if: "if" "const" "then" statement; else: "else" statement; %% ]]) AT_CHECK([bison -v input.y -o input.c]) # Check only the tables. We don't use --no-parser, because it is # still to be implemented in the experimental branch of Bison. AT_CHECK([[sed -n 's/ *$//;/^static const.*\[\] =/,/^}/p' input.c]], 0, [[static const char yytranslate[] = { 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 3, 4, 5, 6 }; static const short yyprhs[] = { 0, 0, 3, 5, 6, 9, 14 }; static const short yyrhs[] = { 8, 0, -1, 9, -1, -1, 10, 11, -1, 3, 4, 5, 8, -1, 6, 8, -1 }; static const short yyrline[] = { 0, 2, 2, 3, 3, 4, 5 }; static const char *const yytname[] = { "$", "error", "$undefined.", "\"if\"", "\"const\"", "\"then\"", "\"else\"", "$axiom", "statement", "struct_stat", "if", "else", 0 }; static const short yytoknum[] = { 0, 256, 2, 257, 258, 259, 260, -1 }; static const short yyr1[] = { 0, 7, 8, 9, 9, 10, 11 }; static const short yyr2[] = { 0, 2, 1, 0, 2, 4, 2 }; static const short yydefact[] = { 3, 0, 0, 2, 0, 0, 0, 3, 4, 3, 6, 5 }; static const short yydefgoto[] = { -1, 2, 3, 4, 8 }; static const short yypact[] = { -2, -1, 4,-32768, 0, 2,-32768, -2,-32768, -2, -32768,-32768 }; static const short yypgoto[] = { -32768, -7,-32768,-32768,-32768 }; static const short yytable[] = { 10, 1, 11, 5, 6, 0, 7, 9 }; static const short yycheck[] = { 7, 3, 9, 4, 0, -1, 6, 5 }; ]]) AT_CLEANUP