X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/095a1d11ca90852ad224bbf9823bf88b7fff9a57..c6b1772473d0a26faa22464df98718d0d0ae2e2e:/tests/conflicts.at diff --git a/tests/conflicts.at b/tests/conflicts.at index 1d4eb04e..8b04449c 100644 --- a/tests/conflicts.at +++ b/tests/conflicts.at @@ -1,7 +1,6 @@ # Exercising Bison on conflicts. -*- Autotest -*- -# Copyright (C) 2002, 2003, 2004, 2005, 2007, 2009, 2010 Free -# Software Foundation, Inc. +# Copyright (C) 2002-2005, 2007-2012 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 @@ -38,7 +37,7 @@ e: 'e' | /* Nothing. */; ]]) AT_BISON_CHECK([-o input.c input.y], 0, [], -[[input.y:4.9: warning: rule useless in parser due to conflicts: e: /* empty */ +[[input.y:4.9: warning: rule useless in parser due to conflicts: e: /* empty */ [-Wother] ]]) AT_CLEANUP @@ -50,20 +49,17 @@ AT_CLEANUP AT_SETUP([%nonassoc and eof]) +AT_BISON_OPTION_PUSHDEFS AT_DATA_GRAMMAR([input.y], [[ %{ #include #include #include +#include #define YYERROR_VERBOSE 1 -static void -yyerror (const char *msg) -{ - fprintf (stderr, "%s\n", msg); -} - +]AT_YYERROR_DEFINE[ /* The current argument. */ static const char *input; @@ -71,8 +67,7 @@ static int yylex (void) { static size_t toknum; - if (! (toknum <= strlen (input))) - abort (); + assert (toknum <= strlen (input)); return input[toknum++]; } @@ -93,57 +88,64 @@ main (int argc, const char *argv[]) return yyparse (); } ]]) +AT_BISON_OPTION_POPDEFS -# Specify the output files to avoid problems on different file systems. -AT_BISON_CHECK([-o input.c input.y]) +m4_pushdef([AT_NONASSOC_AND_EOF_CHECK], +[AT_BISON_CHECK([$1[ -o input.c input.y]]) AT_COMPILE([input]) +m4_pushdef([AT_EXPECTING], [m4_if($2, [correct], [[, expecting $end]])]) + AT_PARSER_CHECK([./input '0<0']) AT_PARSER_CHECK([./input '0<0<0'], [1], [], - [syntax error, unexpected '<' + [syntax error, unexpected '<'AT_EXPECTING ]) AT_PARSER_CHECK([./input '0>0']) AT_PARSER_CHECK([./input '0>0>0'], [1], [], - [syntax error, unexpected '>' + [syntax error, unexpected '>'AT_EXPECTING ]) AT_PARSER_CHECK([./input '0<0>0'], [1], [], - [syntax error, unexpected '>' + [syntax error, unexpected '>'AT_EXPECTING ]) -# We must disable default reductions in inconsistent states in order to -# have an explicit list of all expected tokens. (However, unless we use -# canonical LR, lookahead sets are merged for different left contexts, -# so it is still possible to have extra incorrect tokens in the expected -# list. That just doesn't happen to be a problem for this test case.) - -AT_BISON_CHECK([-Dlr.default-reductions=consistent -o input.c input.y]) -AT_COMPILE([input]) - -AT_PARSER_CHECK([./input '0<0']) -AT_PARSER_CHECK([./input '0<0<0'], [1], [], - [syntax error, unexpected '<', expecting $end -]) +m4_popdef([AT_EXPECTING])]) -AT_PARSER_CHECK([./input '0>0']) -AT_PARSER_CHECK([./input '0>0>0'], [1], [], - [syntax error, unexpected '>', expecting $end -]) +# Expected token list is missing. +AT_NONASSOC_AND_EOF_CHECK([], [[incorrect]]) -AT_PARSER_CHECK([./input '0<0>0'], [1], [], - [syntax error, unexpected '>', expecting $end -]) +# We must disable default reductions in inconsistent states in order to +# have an explicit list of all expected tokens. +AT_NONASSOC_AND_EOF_CHECK([[-Dlr.default-reduction=consistent]], + [[correct]]) + +# lr.default-reduction=consistent happens to work for this test case. +# However, for other grammars, lookahead sets can be merged for +# different left contexts, so it is still possible to have an incorrect +# expected list. Canonical LR is almost a general solution (that is, it +# can fail only when %nonassoc is used), so make sure it gives the same +# result as above. +AT_NONASSOC_AND_EOF_CHECK([[-Dlr.type=canonical-lr]], [[correct]]) + +# parse.lac=full is a completely general solution that does not require +# any of the above sacrifices. Of course, it does not extend the +# language-recognition power of LALR to (IE)LR, but it does ensure that +# the reported list of expected tokens matches what the given parser +# would have accepted in place of the unexpected token. +AT_NONASSOC_AND_EOF_CHECK([[-Dparse.lac=full]], [[correct]]) + +m4_popdef([AT_NONASSOC_AND_EOF_CHECK]) AT_CLEANUP -## -------------------------------------- ## -## %error-verbose and consistent errors. ## -## -------------------------------------- ## +## ------------------------------------------- ## +## parse.error=verbose and consistent errors. ## +## ------------------------------------------- ## -AT_SETUP([[%error-verbose and consistent errors]]) +AT_SETUP([[parse.error=verbose and consistent errors]]) m4_pushdef([AT_CONSISTENT_ERRORS_CHECK], [ @@ -164,7 +166,7 @@ AT_SKEL_JAVA_IF([AT_DATA], [AT_DATA_GRAMMAR])([input.y], #include ]], [[ #include #include - void yyerror (char const *msg);]])[ + ]AT_YYERROR_DECLARE])[ ]AT_YYLEX_PROTOTYPE[; #define USE(Var) } @@ -173,7 +175,7 @@ AT_SKEL_JAVA_IF([AT_DATA], [AT_DATA_GRAMMAR])([input.y], ]$1[ -%error-verbose +%define parse.error verbose %% @@ -205,31 +207,11 @@ public Object getLVal () *lvalp = 1; return *input++; }]])[ - -/*----------. -| yyerror. | -`----------*/]AT_SKEL_JAVA_IF([[ - -public void yyerror (String msg) -{ - System.err.println (msg); -} - +]AT_YYERROR_DEFINE[ +]AT_SKEL_JAVA_IF([[ }; -%%]], [AT_SKEL_CC_IF([[ - -void -yy::parser::error (const yy::location &, std::string const &msg) -{ - std::cerr << msg << std::endl; -}]], [[ - -void -yyerror (char const *msg) -{ - fprintf (stderr, "%s\n", msg); -}]])])[ +%%]])[ /*-------. | main. | @@ -328,12 +310,12 @@ AT_CONSISTENT_ERRORS_CHECK([[%define lr.type ielr # Even canonical LR doesn't foresee the error for 'a'! AT_CONSISTENT_ERRORS_CHECK([[%define lr.type ielr - %define lr.default-reductions consistent]], + %define lr.default-reduction consistent]], [AT_PREVIOUS_STATE_GRAMMAR], [AT_PREVIOUS_STATE_INPUT], [[$end]], [[ab]]) AT_CONSISTENT_ERRORS_CHECK([[%define lr.type ielr - %define lr.default-reductions accepting]], + %define lr.default-reduction accepting]], [AT_PREVIOUS_STATE_GRAMMAR], [AT_PREVIOUS_STATE_INPUT], [[$end]], [[ab]]) @@ -342,6 +324,18 @@ AT_CONSISTENT_ERRORS_CHECK([[%define lr.type canonical-lr]], [AT_PREVIOUS_STATE_INPUT], [[$end]], [[ab]]) +# Only LAC gets it right. +AT_CONSISTENT_ERRORS_CHECK([[%define lr.type canonical-lr + %define parse.lac full]], + [AT_PREVIOUS_STATE_GRAMMAR], + [AT_PREVIOUS_STATE_INPUT], + [[$end]], [[b]]) +AT_CONSISTENT_ERRORS_CHECK([[%define lr.type ielr + %define parse.lac full]], + [AT_PREVIOUS_STATE_GRAMMAR], + [AT_PREVIOUS_STATE_INPUT], + [[$end]], [[b]]) + m4_popdef([AT_PREVIOUS_STATE_GRAMMAR]) m4_popdef([AT_PREVIOUS_STATE_INPUT]) @@ -402,13 +396,13 @@ AT_CONSISTENT_ERRORS_CHECK([[%glr-parser]], [['b']], [[none]]) # No C++ or Java test because yychar cannot be manipulated by users. -AT_CONSISTENT_ERRORS_CHECK([[%define lr.default-reductions consistent]], +AT_CONSISTENT_ERRORS_CHECK([[%define lr.default-reduction consistent]], [AT_USER_ACTION_GRAMMAR], [AT_USER_ACTION_INPUT], [['b']], [[none]]) # Canonical LR doesn't foresee the error for 'a'! -AT_CONSISTENT_ERRORS_CHECK([[%define lr.default-reductions accepting]], +AT_CONSISTENT_ERRORS_CHECK([[%define lr.default-reduction accepting]], [AT_USER_ACTION_GRAMMAR], [AT_USER_ACTION_INPUT], [[$end]], [[a]]) @@ -417,6 +411,16 @@ AT_CONSISTENT_ERRORS_CHECK([[%define lr.type canonical-lr]], [AT_USER_ACTION_INPUT], [[$end]], [[a]]) +AT_CONSISTENT_ERRORS_CHECK([[%define parse.lac full]], + [AT_USER_ACTION_GRAMMAR], + [AT_USER_ACTION_INPUT], + [['b']], [[none]]) +AT_CONSISTENT_ERRORS_CHECK([[%define parse.lac full + %define lr.default-reduction accepting]], + [AT_USER_ACTION_GRAMMAR], + [AT_USER_ACTION_INPUT], + [[$end]], [[none]]) + m4_popdef([AT_USER_ACTION_GRAMMAR]) m4_popdef([AT_USER_ACTION_INPUT]) @@ -426,6 +430,103 @@ AT_CLEANUP +## ------------------------------------------------------- ## +## LAC: %nonassoc requires splitting canonical LR states. ## +## ------------------------------------------------------- ## + +# This test case demonstrates that, when %nonassoc is used, canonical +# LR(1) parser table construction followed by conflict resolution +# without further state splitting is not always sufficient to produce a +# parser that can detect all syntax errors as soon as possible on one +# token of lookahead. However, LAC solves the problem completely even +# with minimal LR parser tables. + +AT_SETUP([[LAC: %nonassoc requires splitting canonical LR states]]) +AT_BISON_OPTION_PUSHDEFS +AT_DATA_GRAMMAR([[input.y]], +[[%code { + #include + ]AT_YYERROR_DECLARE[ + ]AT_YYLEX_DECLARE[ +} + +%error-verbose +%nonassoc 'a' + +%% + +start: + 'a' problem 'a' // First context. +| 'b' problem 'b' // Second context. +| 'c' reduce-nonassoc // Just makes reduce-nonassoc useful. +; + +problem: + look reduce-nonassoc +| look 'a' +| look 'b' +; + +// For the state reached after shifting the 'a' in these productions, +// lookahead sets are the same in both the first and second contexts. +// Thus, canonical LR reuses the same state for both contexts. However, +// the lookahead 'a' for the reduction "look: 'a'" later becomes an +// error action only in the first context. In order to immediately +// detect the syntax error on 'a' here for only the first context, this +// canonical LR state would have to be split into two states, and the +// 'a' lookahead would have to be removed from only one of the states. +look: + 'a' // Reduction lookahead set is always ['a', 'b']. +| 'a' 'b' +| 'a' 'c' // 'c' is forgotten as an expected token. +; + +reduce-nonassoc: %prec 'a'; + +%% +]AT_YYERROR_DEFINE[ +]AT_YYLEX_DEFINE(["aaa"])[ + +int +main (void) +{ + return yyparse (); +} +]]) +AT_BISON_OPTION_POPDEFS + +# Show canonical LR's failure. +AT_BISON_CHECK([[-Dlr.type=canonical-lr -o input.c input.y]], + [[0]], [[]], +[[input.y: warning: 2 shift/reduce conflicts [-Wconflicts-sr] +]]) +AT_COMPILE([[input]]) +AT_PARSER_CHECK([[./input]], [[1]], [[]], +[[syntax error, unexpected 'a', expecting 'b' +]]) + +# It's corrected by LAC. +AT_BISON_CHECK([[-Dlr.type=canonical-lr -Dparse.lac=full \ + -o input.c input.y]], [[0]], [[]], +[[input.y: warning: 2 shift/reduce conflicts [-Wconflicts-sr] +]]) +AT_COMPILE([[input]]) +AT_PARSER_CHECK([[./input]], [[1]], [[]], +[[syntax error, unexpected 'a', expecting 'b' or 'c' +]]) + +# IELR is sufficient when LAC is used. +AT_BISON_CHECK([[-Dlr.type=ielr -Dparse.lac=full -o input.c input.y]], + [[0]], [[]], +[[input.y: warning: 2 shift/reduce conflicts [-Wconflicts-sr] +]]) +AT_COMPILE([[input]]) +AT_PARSER_CHECK([[./input]], [[1]], [[]], +[[syntax error, unexpected 'a', expecting 'b' or 'c' +]]) + +AT_CLEANUP + ## ------------------------- ## ## Unresolved SR Conflicts. ## ## ------------------------- ## @@ -441,8 +542,8 @@ exp: exp OP exp | NUM; ]]) AT_BISON_CHECK([-o input.c --report=all input.y], 0, [], -[input.y: conflicts: 1 shift/reduce -]) +[[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr] +]]) # Check the contents of the report. AT_CHECK([cat input.output], [], @@ -473,7 +574,7 @@ exp (6) on left: 1 2, on right: 0 1 -state 0 +State 0 0 $accept: . exp $end 1 exp: . exp OP exp @@ -484,14 +585,14 @@ state 0 exp go to state 2 -state 1 +State 1 2 exp: NUM . $default reduce using rule 2 (exp) -state 2 +State 2 0 $accept: exp . $end 1 exp: exp . OP exp @@ -500,14 +601,14 @@ state 2 OP shift, and go to state 4 -state 3 +State 3 0 $accept: exp $end . $default accept -state 4 +State 4 1 exp: . exp OP exp 1 | exp OP . exp @@ -518,7 +619,7 @@ state 4 exp go to state 5 -state 5 +State 5 1 exp: exp . OP exp 1 | exp OP exp . [$end, OP] @@ -576,7 +677,7 @@ exp (6) on left: 1 2, on right: 0 1 -state 0 +State 0 0 $accept: . exp $end 1 exp: . exp OP exp @@ -587,14 +688,14 @@ state 0 exp go to state 2 -state 1 +State 1 2 exp: NUM . $default reduce using rule 2 (exp) -state 2 +State 2 0 $accept: exp . $end 1 exp: exp . OP exp @@ -603,14 +704,14 @@ state 2 OP shift, and go to state 4 -state 3 +State 3 0 $accept: exp $end . $default accept -state 4 +State 4 1 exp: . exp OP exp 1 | exp OP . exp @@ -621,7 +722,7 @@ state 4 exp go to state 5 -state 5 +State 5 1 exp: exp . OP exp 1 | exp OP exp . [$end, OP] @@ -634,6 +735,62 @@ state 5 AT_CLEANUP +## ---------------------- ## +## %precedence suffices. ## +## ---------------------- ## + +AT_SETUP([%precedence suffices]) + +AT_DATA([input.y], +[[%precedence "then" +%precedence "else" +%% +stmt: + "if" cond "then" stmt +| "if" cond "then" stmt "else" stmt +| "stmt" +; + +cond: + "exp" +; +]]) + +AT_BISON_CHECK([-o input.c input.y]) + +AT_CLEANUP + + +## ------------------------------ ## +## %precedence does not suffice. ## +## ------------------------------ ## + +AT_SETUP([%precedence does not suffice]) + +AT_DATA([input.y], +[[%precedence "then" +%precedence "else" +%% +stmt: + "if" cond "then" stmt +| "if" cond "then" stmt "else" stmt +| "stmt" +; + +cond: + "exp" +| cond "then" cond +; +]]) + +AT_BISON_CHECK([-o input.c input.y], 0, [], +[[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr] +input.y:12.3-18: warning: rule useless in parser due to conflicts: cond: cond "then" cond [-Wother] +]]) + +AT_CLEANUP + + ## -------------------------------- ## ## Defaulted Conflicted Reduction. ## ## -------------------------------- ## @@ -671,8 +828,8 @@ id : '0'; ]]) AT_BISON_CHECK([-o input.c --report=all input.y], 0, [], -[[input.y: conflicts: 1 reduce/reduce -input.y:4.6-8: warning: rule useless in parser due to conflicts: id: '0' +[[input.y: warning: 1 reduce/reduce conflict [-Wconflicts-rr] +input.y:4.6-8: warning: rule useless in parser due to conflicts: id: '0' [-Wother] ]]) # Check the contents of the report. @@ -716,7 +873,7 @@ id (7) on left: 4, on right: 2 -state 0 +State 0 0 $accept: . exp $end 1 exp: . num @@ -731,7 +888,7 @@ state 0 id go to state 4 -state 1 +State 1 3 num: '0' . [$end] 4 id: '0' . [$end] @@ -741,28 +898,28 @@ state 1 $default reduce using rule 3 (num) -state 2 +State 2 0 $accept: exp . $end $end shift, and go to state 5 -state 3 +State 3 1 exp: num . $default reduce using rule 1 (exp) -state 4 +State 4 2 exp: id . $default reduce using rule 2 (exp) -state 5 +State 5 0 $accept: exp $end . @@ -788,9 +945,8 @@ exp: exp OP exp | NUM; ]]) AT_BISON_CHECK([-o input.c input.y], 1, [], -[input.y: conflicts: 1 shift/reduce -input.y: expected 0 shift/reduce conflicts -]) +[[input.y: error: shift/reduce conflicts: 1 found, 0 expected +]]) AT_CLEANUP @@ -825,9 +981,8 @@ exp: exp OP exp | NUM; ]]) AT_BISON_CHECK([-o input.c input.y], 1, [], -[input.y: conflicts: 1 shift/reduce -input.y: expected 2 shift/reduce conflicts -]) +[[input.y: error: shift/reduce conflicts: 1 found, 2 expected +]]) AT_CLEANUP @@ -845,9 +1000,8 @@ a: 'a'; ]]) AT_BISON_CHECK([-o input.c input.y], 1, [], -[input.y: conflicts: 1 reduce/reduce -input.y: expected 0 reduce/reduce conflicts -]) +[[input.y: error: reduce/reduce conflicts: 1 found, 0 expected +]]) AT_CLEANUP @@ -889,7 +1043,7 @@ e: e '+' e ]]) AT_BISON_CHECK([-o input.c input.y], 0, [], -[[input.y: conflicts: 4 shift/reduce +[[input.y: warning: 4 shift/reduce conflicts [-Wconflicts-sr] ]]) AT_CLEANUP @@ -991,14 +1145,15 @@ reported_conflicts: ]]) AT_BISON_CHECK([[--report=all input.y]], 0, [], -[[input.y: conflicts: 1 shift/reduce, 1 reduce/reduce -input.y:12.5-20: warning: rule useless in parser due to conflicts: resolved_conflict: 'a' unreachable1 -input.y:20.5-20: warning: rule useless in parser due to conflicts: unreachable1: 'a' unreachable2 -input.y:21.4: warning: rule useless in parser due to conflicts: unreachable1: /* empty */ -input.y:25.13: warning: rule useless in parser due to conflicts: unreachable2: /* empty */ -input.y:25.16: warning: rule useless in parser due to conflicts: unreachable2: /* empty */ -input.y:31.5-7: warning: rule useless in parser due to conflicts: reported_conflicts: 'a' -input.y:32.4: warning: rule useless in parser due to conflicts: reported_conflicts: /* empty */ +[[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr] +input.y: warning: 1 reduce/reduce conflict [-Wconflicts-rr] +input.y:12.5-20: warning: rule useless in parser due to conflicts: resolved_conflict: 'a' unreachable1 [-Wother] +input.y:20.5-20: warning: rule useless in parser due to conflicts: unreachable1: 'a' unreachable2 [-Wother] +input.y:21.4: warning: rule useless in parser due to conflicts: unreachable1: /* empty */ [-Wother] +input.y:25.13: warning: rule useless in parser due to conflicts: unreachable2: /* empty */ [-Wother] +input.y:25.16: warning: rule useless in parser due to conflicts: unreachable2: /* empty */ [-Wother] +input.y:31.5-7: warning: rule useless in parser due to conflicts: reported_conflicts: 'a' [-Wother] +input.y:32.4: warning: rule useless in parser due to conflicts: reported_conflicts: /* empty */ [-Wother] ]]) AT_CHECK([[cat input.output]], 0, @@ -1063,7 +1218,7 @@ reported_conflicts (9) on left: 8 9 10, on right: 1 -state 0 +State 0 0 $accept: . start $end 1 start: . resolved_conflict 'a' reported_conflicts 'a' @@ -1078,28 +1233,28 @@ state 0 Conflict between rule 3 and token 'a' resolved as reduce (%left 'a'). -state 1 +State 1 0 $accept: start . $end $end shift, and go to state 3 -state 2 +State 2 1 start: resolved_conflict . 'a' reported_conflicts 'a' 'a' shift, and go to state 4 -state 3 +State 3 0 $accept: start $end . $default accept -state 4 +State 4 1 start: resolved_conflict 'a' . reported_conflicts 'a' 8 reported_conflicts: . 'a' @@ -1113,7 +1268,7 @@ state 4 reported_conflicts go to state 6 -state 5 +State 5 8 reported_conflicts: 'a' . ['a'] 9 | 'a' . ['a'] @@ -1123,14 +1278,14 @@ state 5 $default reduce using rule 8 (reported_conflicts) -state 6 +State 6 1 start: resolved_conflict 'a' reported_conflicts . 'a' 'a' shift, and go to state 7 -state 7 +State 7 1 start: resolved_conflict 'a' reported_conflicts 'a' . @@ -1138,16 +1293,17 @@ state 7 ]]) AT_DATA([[input-keep.y]], -[[%define lr.keep-unreachable-states +[[%define lr.keep-unreachable-state ]]) AT_CHECK([[cat input.y >> input-keep.y]]) AT_BISON_CHECK([[input-keep.y]], 0, [], -[[input-keep.y: conflicts: 2 shift/reduce, 2 reduce/reduce -input-keep.y:22.4: warning: rule useless in parser due to conflicts: unreachable1: /* empty */ -input-keep.y:26.16: warning: rule useless in parser due to conflicts: unreachable2: /* empty */ -input-keep.y:32.5-7: warning: rule useless in parser due to conflicts: reported_conflicts: 'a' -input-keep.y:33.4: warning: rule useless in parser due to conflicts: reported_conflicts: /* empty */ +[[input-keep.y: warning: 2 shift/reduce conflicts [-Wconflicts-sr] +input-keep.y: warning: 2 reduce/reduce conflicts [-Wconflicts-rr] +input-keep.y:22.4: warning: rule useless in parser due to conflicts: unreachable1: /* empty */ [-Wother] +input-keep.y:26.16: warning: rule useless in parser due to conflicts: unreachable2: /* empty */ [-Wother] +input-keep.y:32.5-7: warning: rule useless in parser due to conflicts: reported_conflicts: 'a' [-Wother] +input-keep.y:33.4: warning: rule useless in parser due to conflicts: reported_conflicts: /* empty */ [-Wother] ]]) AT_CLEANUP @@ -1184,8 +1340,8 @@ empty_c2: %prec 'c' ; empty_c3: %prec 'd' ; ]]) AT_BISON_CHECK([[--report=all -o input.c input.y]], 0, [], [ignore]) -AT_CHECK([[cat input.output | sed -n '/^state 0$/,/^state 1$/p']], 0, -[[state 0 +AT_CHECK([[cat input.output | sed -n '/^State 0$/,/^State 1$/p']], 0, +[[State 0 0 $accept: . start $end 1 start: . 'a' @@ -1203,7 +1359,7 @@ AT_CHECK([[cat input.output | sed -n '/^state 0$/,/^state 1$/p']], 0, 13 empty_c3: . ['c'] 'b' shift, and go to state 1 - + 'c' reduce using rule 13 (empty_c3) $default reduce using rule 9 (empty_a) @@ -1221,7 +1377,7 @@ AT_CHECK([[cat input.output | sed -n '/^state 0$/,/^state 1$/p']], 0, Conflict between rule 13 and token 'c' resolved as reduce ('c' < 'd'). -state 1 +State 1 ]]) AT_CLEANUP @@ -1260,8 +1416,8 @@ empty_c3: %prec 'c' ; ]]) AT_BISON_CHECK([[--report=all -o input.c input.y]], 0, [], [ignore]) -AT_CHECK([[cat input.output | sed -n '/^state 0$/,/^state 1$/p']], 0, -[[state 0 +AT_CHECK([[cat input.output | sed -n '/^State 0$/,/^State 1$/p']], 0, +[[State 0 0 $accept: . start $end 1 start: . 'a' @@ -1297,6 +1453,150 @@ AT_CHECK([[cat input.output | sed -n '/^state 0$/,/^state 1$/p']], 0, Conflict between rule 11 and token 'c' resolved as an error (%nonassoc 'c'). -state 1 +State 1 +]]) +AT_CLEANUP + + +## -------------------- ## +## %expect-rr non GLR. ## +## -------------------- ## + +AT_SETUP([[%expect-rr non GLR]]) + +AT_DATA([[1.y]], +[[%expect-rr 0 +%% +exp: 'a' +]]) + +AT_BISON_CHECK([[1.y]], [[0]], [], +[[1.y: warning: %expect-rr applies only to GLR parsers [-Wother] +]]) + +AT_DATA([[2.y]], +[[%expect-rr 1 +%% +exp: 'a' | 'a'; +]]) + +AT_BISON_CHECK([[2.y]], [[0]], [], +[[2.y: warning: %expect-rr applies only to GLR parsers [-Wother] +2.y: warning: 1 reduce/reduce conflict [-Wconflicts-rr] +2.y:3.12-14: warning: rule useless in parser due to conflicts: exp: 'a' [-Wother] +]]) + +AT_CLEANUP + + +## ---------------------------------- ## +## -W versus %expect and %expect-rr. ## +## ---------------------------------- ## + +AT_SETUP([[-W versus %expect and %expect-rr]]) + +AT_DATA([[sr-rr.y]], +[[%glr-parser +%% +start: 'a' | A 'a' | B 'a' ; +A: ; +B: ; ]]) +AT_DATA([[sr.y]], +[[%glr-parser +%% +start: 'a' | A 'a' ; +A: ; +]]) +AT_DATA([[rr.y]], +[[%glr-parser +%% +start: A | B ; +A: ; +B: ; +]]) + +AT_BISON_CHECK([[sr-rr.y]], [[0]], [[]], +[[sr-rr.y: warning: 1 shift/reduce conflict [-Wconflicts-sr] +sr-rr.y: warning: 1 reduce/reduce conflict [-Wconflicts-rr] +]]) +AT_BISON_CHECK([[-Wno-conflicts-sr sr-rr.y]], [[0]], [[]], +[[sr-rr.y: warning: 1 reduce/reduce conflict [-Wconflicts-rr] +]]) +AT_BISON_CHECK([[-Wno-conflicts-rr sr-rr.y]], [[0]], [[]], +[[sr-rr.y: warning: 1 shift/reduce conflict [-Wconflicts-sr] +]]) + +[ +# This is piece of code is rather complex for a simple task: try every +# combinaison of (0 or 1 real SR) x (0 or 1 real RR) x (don't %expect +# or %expect 0, 1, or 2 SR) x (don't %expect-rr or %expect-rr 0, 1, or 2 +# RR). + +# Number and types of genuine conflicts in the grammar. +for gram in sr-rr sr rr; do + # Number of expected s/r conflicts. + for sr_exp_i in '' 0 1 2; do + # Number of expected r/r conflicts. + for rr_exp_i in '' 0 1 2; do + test -z "$sr_exp_i" && test -z "$rr_exp_i" && continue + + # Build grammar file. + sr_exp=0 + rr_exp=0 + file=$gram + directives= + if test -n "$sr_exp_i"; then + sr_exp=$sr_exp_i + file=$file-expect-$sr_exp + directives="%expect $sr_exp" + fi + if test -n "$rr_exp_i"; then + rr_exp=$rr_exp_i + file=$file-expect-rr-$rr_exp + directives="$directives %expect-rr $rr_exp" + fi + file=$file.y + echo "$directives" > $file + cat $gram.y >> $file + + # Number of found conflicts. + case $gram in + (sr) sr_count=1; rr_count=0;; + (rr) sr_count=0; rr_count=1;; + (sr-rr) sr_count=1; rr_count=1;; + esac + + # Update number of expected conflicts: if %expect is given then + # %expect-rr defaults to 0, and vice-versa. Leave empty if + # nothing expected. + case $sr_exp_i:$rr_exp_i in + ?:) rr_exp_i=0;; + :?) sr_exp_i=0;; + esac + + # Run tests. + if test $sr_count -eq $sr_exp && test $rr_count -eq $rr_exp; then + ]AT_BISON_CHECK([[-Wnone $file]])[ + ]AT_BISON_CHECK([[-Werror $file]])[ + else + { + if test -z "$sr_exp_i" && test "$sr_count" -ne 0; then + echo "warning: $sr_count shift/reduce conflicts" + elif test "$sr_exp_i" -ne "$sr_count"; then + echo "error: shift/reduce conflicts: $sr_count found, $sr_exp_i expected" + fi + if test -z "$rr_exp_i" && test "$rr_count" -ne 0; then + echo "warning: $rr_count reduce/reduce conflicts" + elif test "$rr_exp_i" -ne "$rr_count"; then + echo "error: reduce/reduce conflicts: $rr_count found, $rr_exp_i expected" + fi + } | sed -e "s/^/$file: /" > experr + ]AT_BISON_CHECK([[-Wnone $file]], [[1]], [[]], [[experr]])[ + ]AT_BISON_CHECK([[-Werror $file]], [[1]], [[]], [[experr]])[ + fi + done + done +done] + AT_CLEANUP