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lalr1.cc: support compilation with disabled support for exceptions

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Reported by Brooks Moses <bmoses@google.com>
http://lists.gnu.org/archive/html/bison-patches/2018-02/msg00000.html

* data/lalr1.cc (YY_EXCEPTIONS): New.
Use it to disable try/catch clauses.

* doc/bison.texi (C++ Parser Interface): Document it.

* configure.ac (CXXFLAGS_NO_EXCEPTIONS): New.
* tests/atlocal.in: Receive it.
* tests/local.at (AT_FULL_COMPILE, AT_LANG_COMPILE):
Accept a new argument, extra compiler flags.
* tests/calc.at: Run the C++ calculator with exception support disabled.
This commit is contained in:
Akim Demaille
2018-08-17 19:28:50 +02:00
parent 32e0fd1a99
commit 44e76d801f
8 changed files with 68 additions and 28 deletions
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21
data/lalr1.cc
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@@ -424,6 +424,15 @@ m4_if(b4_prefix, [yy], [],
# endif
#endif
// Whether we are compiled with exception support.
#ifndef YY_EXCEPTIONS
# if defined __GNUC__ && !defined __EXCEPTIONS
# define YY_EXCEPTIONS 0
# else
# define YY_EXCEPTIONS 1
# endif
#endif
]b4_locations_if([dnl
[#define YYRHSLOC(Rhs, K) ((Rhs)[K].location)
]b4_yylloc_default_define])[
@@ -717,7 +726,9 @@ m4_if(b4_prefix, [yy], [],
/// The return value of parse ().
int yyresult;
#if YY_EXCEPTIONS
try
#endif // YY_EXCEPTIONS
{
YYCDEBUG << "Starting parse\n";
@@ -755,17 +766,21 @@ b4_dollar_popdef])[]dnl
if (yyla.empty ())
{
YYCDEBUG << "Reading a token: ";
#if YY_EXCEPTIONS
try
#endif // YY_EXCEPTIONS
{]b4_token_ctor_if([[
symbol_type yylookahead (]b4_lex[);
yyla.move (yylookahead);]], [[
yyla.type = yytranslate_ (]b4_lex[);]])[
}
#if YY_EXCEPTIONS
catch (const syntax_error& yyexc)
{
error (yyexc);
goto yyerrlab1;
}
#endif // YY_EXCEPTIONS
}
YY_SYMBOL_PRINT ("Next token is", yyla);
@@ -835,7 +850,9 @@ b4_dollar_popdef])[]dnl
// Perform the reduction.
YY_REDUCE_PRINT (yyn);
#if YY_EXCEPTIONS
try
#endif // YY_EXCEPTIONS
{
switch (yyn)
{
@@ -844,11 +861,13 @@ b4_dollar_popdef])[]dnl
break;
}
}
#if YY_EXCEPTIONS
catch (const syntax_error& yyexc)
{
error (yyexc);
YYERROR;
}
#endif // YY_EXCEPTIONS
YY_SYMBOL_PRINT ("-> $$ =", yylhs);
yypop_ (yylen);
yylen = 0;
@@ -973,6 +992,7 @@ b4_dollar_popdef])[]dnl
return yyresult;
}
#if YY_EXCEPTIONS
catch (...)
{
YYCDEBUG << "Exception caught: cleaning lookahead and stack\n";
@@ -988,6 +1008,7 @@ b4_dollar_popdef])[]dnl
}
throw;
}
#endif // YY_EXCEPTIONS
}
void