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grammar: record used associativity and print useless ones

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Record which symbol associativity is used, and display useless ones.

* src/symtab.h, src/symtab.c (register_assoc, print_assoc_warnings): New
* src/symtab.c (init_assoc, is_assoc_used): New
* src/main.c: Use print_assoc_warnings
* src/conflicts.c: Use register_assoc
* tests/conflicts.at (Useless associativity warning): New.

Due to the new warning, many tests had to be updated.

* tests/conflicts.at tests/existing.at tests/regression.at:
Add the associativity warning in the expected results.
* tests/java.at: Fix the java calculator's grammar to remove a useless
associativity.
* doc/bison.texi (mfcalc example): Fix associativity to remove
warning.
This commit is contained in:
Valentin Tolmer
2013-01-29 16:27:04 +01:00
committed by Akim Demaille
parent 284bc49c83
commit e8f7155d98
9 changed files with 275 additions and 9 deletions
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56
tests/conflicts.at
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@@ -17,6 +17,38 @@
AT_BANNER([[Conflicts.]])
## ------------------------------ ##
## Useless associativity warning. ##
## ------------------------------ ##
AT_SETUP([Useless associativity warning])
AT_DATA([[input.y]],
[[%token T
%left A B
%right C
%nonassoc D
%precedence E
%%
e: T A T
| T B T
| T C T
| T D T
| T E T
;
]])
AT_BISON_CHECK([input.y], 0, [],
[[input.y:5.13: warning: useless precedence for E [-Wother]
input.y:2.7: warning: useless associativity for A [-Wother]
input.y:2.9: warning: useless associativity for B [-Wother]
input.y:3.8: warning: useless associativity for C [-Wother]
input.y:4.11: warning: useless associativity for D [-Wother]
]])
AT_CLEANUP
## ------------------------ ##
## Token declaration order. ##
@@ -85,6 +117,19 @@ input.y:24.17: warning: useless precedence for T [-Wother]
input.y:24.19: warning: useless precedence for U [-Wother]
input.y:25.13: warning: useless precedence for V [-Wother]
input.y:25.15: warning: useless precedence for W [-Wother]
input.y:18.8: warning: useless associativity for E [-Wother]
input.y:18.10: warning: useless associativity for F [-Wother]
input.y:18.12: warning: useless associativity for G [-Wother]
input.y:19.8: warning: useless associativity for H [-Wother]
input.y:19.10: warning: useless associativity for I [-Wother]
input.y:20.8: warning: useless associativity for J [-Wother]
input.y:21.8: warning: useless associativity for K [-Wother]
input.y:22.8: warning: useless associativity for L [-Wother]
input.y:22.10: warning: useless associativity for M [-Wother]
input.y:22.12: warning: useless associativity for N [-Wother]
input.y:23.11: warning: useless associativity for O [-Wother]
input.y:23.13: warning: useless associativity for P [-Wother]
input.y:23.15: warning: useless associativity for Q [-Wother]
]])
AT_COMPILE([input])
@@ -133,6 +178,15 @@ AT_BISON_CHECK([-fcaret -o input.c input.y], 0, [],
[[input.y:2.13: warning: useless precedence for Z [-Wother]
%precedence Z
^
input.y:5.7: warning: useless associativity for W [-Wother]
%left W
^
input.y:6.8: warning: useless associativity for V [-Wother]
%right V
^
input.y:7.11: warning: useless associativity for U [-Wother]
%nonassoc U
^
]])
AT_CLEANUP
@@ -1144,6 +1198,8 @@ e: e '+' e
AT_BISON_CHECK([-o input.c input.y], 0, [],
[[input.y: warning: 4 shift/reduce conflicts [-Wconflicts-sr]
input.y:1.7-9: warning: useless associativity for '+' [-Wother]
input.y:2.7-9: warning: useless associativity for '*' [-Wother]
]])
AT_CLEANUP