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142 Commits

Author SHA1 Message Date
Akim Demaille
3f5e6905da doc: spell check 
* README, doc/bison.texi, examples/README, examples/c++/README: here.
 2018-10-26 08:40:07 +02:00
Akim Demaille
719782e6ba examples: add a Makefile for C++ short examples 
* examples/c++/Makefile: New.
* examples/c++/local.mk, examples/c++/README: Adjust.
 2018-10-26 08:35:10 +02:00
Akim Demaille
f3110c9b9a examples: check the errors 
* examples/test (run): Check stderr, unless -noerr is passed.
* examples/calc++/calc++.test, examples/mfcalc/mfcalc.test: Check
errors.
 2018-10-26 07:42:28 +02:00
Akim Demaille
849d91bc02 configure: quit on trying to get ICC and Flex be friends 
The CI is using Flex 2.5.35.  And ICC is too picky for it.  Let's stop
making these warnings errors.  I wish I could disable them in the
source files using the ICC version and the Flex version, but ICC's
pragma support is unclear, and I'm tired of fighting it.

* configure.ac (FLEX_SCANNER_CXXFLAGS): Make warnings warnings.
* examples/c++/local.mk: Comment changes.
 2018-10-24 21:53:21 +02:00
Akim Demaille
5b879c8980 c++: std::to_string is available in C++11 
Reported by Victor Khomenko.
http://lists.gnu.org/archive/html/bug-bison/2018-10/msg00033.html

* doc/bison.texi, examples/c++/variant-11.yy: Use std::to_string
instead of ours.
 2018-10-24 18:49:04 +02:00
Akim Demaille
8fd5f0d5a5 examples: move the variant examples into the C++ directory 
* examples/variant-11.test examples/variant-11.yy,
* examples/variant.test examples/variant.yy:
Move into examples/c++/.
* examples/c++/README: New.
* examples/README, examples/c++/local.mk, examples/local.mk:
Adjust.
 2018-10-24 07:20:08 +02:00
Akim Demaille
a4dce889a4 doc: an introductory example for C++ 
Suggested by Victor Khomenko.
http://lists.gnu.org/archive/html/bug-bison/2018-08/msg00037.html

* doc/bison.texi (A Simple C++ Example): New.
* examples/c++/local.mk, examples/c++/simple.test: New.
Extract, check, and install this new example.
* examples/local.mk: Adjust.
* examples/test: Adjust to the case where the dirname differs
from the test name.
 2018-10-24 06:18:57 +02:00
Akim Demaille
7c4b40de61 build: remove a few copies of the Copyright from the generated Makefile 
* build-aux/local.mk, cfg.mk, examples/calc++/local.mk,
* examples/local.mk, examples/mfcalc/local.mk,
* examples/rpcalc/local.mk, lib/local.mk, src/local.mk,
* tests/local.mk:
Use Automake comments so that we don't get a copy of each in the
generated Makefile.
 2018-10-24 06:18:57 +02:00
Akim Demaille
05d702422a examples: clang 5 defines nullptr as a macro 
* examples/variant.yy: So don't do it.
* examples/variant-11.yy: Fix comment.
 2018-10-23 09:08:57 +02:00
Akim Demaille
4b0efdeb28 c++: minor changes 
* data/lalr1.cc: Fix oldish comment.
* data/stack.hh: Prefer typename for type names.
Use size() instead of duplicating it.
* examples/variant-11.yy, examples/variant.yy (yylex): Use int,
as this is the type of the semantic value.
 2018-10-22 08:40:39 +02:00
Akim Demaille
602f8e2a77 c++: do not exhibit private macros 
* examples/variant-11.yy: here.
 2018-10-20 13:56:40 +02:00
Akim Demaille
bf338b7cd2 examples: force stack resizing with unique_ptr 
In the previous commit we fixed a problem when the C++ stack was
resized.  The test was using ints.  Let's add a test with someone
quite touchy: unique_ptr

* examples/variant-11.yy: Accept an argument, which is the number of
numbers to send to the parser.
* examples/variant-11.test: Check with many numbers.
 2018-10-18 08:51:08 +02:00
Akim Demaille
b994c3bf78 doc: improve the doc of the examples 
* examples/README: here.
 2018-10-17 19:00:29 +02:00
Akim Demaille
8359341013 examples: don't generate the position/stack files 
* examples/variant-11.yy, examples/variant.yy: Require 3.2.
 2018-10-16 22:41:13 +02:00
Akim Demaille
01898726e2 generate the default semantic action 
Currently, in C, the default semantic action is implemented by being
always run before running the actual user semantic action.  As a
consequence, when the user action is run, $$ is already set as $1.

In C++ with variants, we don't do that, since we cannot manipulate the
semantic value without knowing its exact type.  When variants are
enabled, the only guarantee is that $$ is default contructed and ready
to the used.

Some users still would like the default action to be run with
variants.  Frank Heckenbach's parser in
C++17 (http://lists.gnu.org/archive/html/bug-bison/2018-04/msg00011.html)
provides this feature, but relying on std::variant's dynamic typing,
which we forbid in lalr1.cc.

The simplest seems to be actually generating the default semantic
action (in all languages/skeletons).  This makes the pre-action (that
sets $$ to $1) useless.  But...  maybe some users depend on this, in
spite of the comments that clearly warn againt this.  So let's not
turn this off just yet.

* src/reader.c (grammar_rule_check_and_complete): Rename as...
(grammar_rule_check_and_complete): this.
Install the default semantic action when applicable.
* examples/variant-11.yy, examples/variant.yy, tests/calc.at:
Exercise the default semantic action, even with variants.
 2018-10-14 18:53:21 +02:00
Akim Demaille
fa386893aa C++: style: add missing space before parens 
* data/c++.m4, data/lalr1.cc, data/stack.hh, data/variant.hh,
* examples/variant-11.yy: here.
 2018-10-14 15:20:39 +02:00
Akim Demaille
c164fc0822 build: fix distcheck 
Now that distcheck no longer fails (see previous commit), let's
address the shortcomings.

* Makefile.am (CLEANDIRS, clean-local): New.
* doc/local.mk, examples/calc++/local.mk, examples/local.mk,
* examples/mfcalc/local.mk, examples/rpcalc/local.mk,
* src/local.mk
(CLEANDIRS): Get rid of Apple's *.dSYM directories.
(CLEANFILES): Get rid of *.output files.
* examples/variant-11.yy, examples/variant.yy: Don't generate
any of the auxiliary files (location.hh and the like).
 2018-10-07 10:41:40 +02:00
Josh Soref
3aed6a21f5 spelling: builddir 2018-10-05 07:01:04 +02:00
Akim Demaille
3eb9042a30 c++: introduce api.value.automove 
Based on work by Frank Heckenbach.
See http://lists.gnu.org/archive/html/bug-bison/2018-04/msg00000.html
and http://lists.gnu.org/archive/html/bug-bison/2018-09/msg00019.html.

* data/lalr1.cc (b4_rhs_value): Use YY_MOVE api.rhs.automove is set.
* doc/bison.texi (%define Summary): Document api.rhs.automove.
* examples/variant-11.yy: Use it.

* tests/local.at (AT_AUTOMOVE_IF): New.
* tests/c++.at (Variants): Check move semantics.
 2018-09-22 09:49:46 +02:00
Akim Demaille
f19ecae3b2 lalr1.cc: support move semantics 
Modern C++ (i.e., C++11 and later) introduced "move only" types: types such
as std::unique_ptr<T> that can never be duplicated.  They must never be
copied (by assignments and constructors), they must be "moved".  The
implementation of lalr1.cc used to copy symbols (including their semantic
values).  This commit ensures that values are only moved in modern C++, yet
remain compatible with C++98/C++03.

Suggested by Frank Heckenbach, who provided a full implementation on
top of C++17's std::variant.
See http://lists.gnu.org/archive/html/bug-bison/2018-03/msg00002.html,
and https://lists.gnu.org/archive/html/bison-patches/2018-04/msg00002.html.

Symbols (terminal/non terminal) are handled by several functions that used
to take const-refs, which resulted eventually in a copy pushed on the stack.
With modern C++ (C++11 and later) the callers must use std::move, and the
callees must take their arguments as rvalue refs (foo&&).  In order to avoid
duplicating these functions to support both legacy C++ and modern C++, let's
introduce macros (YY_MOVE, YY_RVREF, etc.)  that rely on copy-semantics for
C++98/03, and move-semantics for modern C++.

That's easy for inner types, when the parser's functions pass arguments to
each other.  Functions facing the user (make_NUMBER, make_STRING, etc.)
should support both rvalue-refs (for instance to support move-only types:
make_INT (std::make_unique<int> (1))), and lvalue-refs (so that we can pass
a variable: make_INT (my_int)).  To avoid the multiplication of the
signatures (there is also the location), let's take the argument by value.

See:
https://lists.gnu.org/archive/html/bison-patches/2018-09/msg00024.html.

* data/c++.m4 (b4_cxx_portability): New.
(basic_symbol): In C++11, replace copy-ctors with move-ctors.
In C++11, replace copies with moves.
* data/lalr1.cc (stack_symbol_type, yypush_): Likewise.
Use YY_MOVE to avoid useless copies.
* data/variant.hh (variant): Support move-semantics.
(make_SYMBOL): In C++11, in order to support both read-only lvalues,
and rvalues, take the argument as a copy.
* data/stack.hh (yypush_): Use rvalue-refs in C++11.
* tests/c++.at: Use move semantics.

* tests/headers.at: Adjust to the new macros (YY_MOVE, etc.).

* configure.ac (CXX98_CXXFLAGS, CXX11_CXXFLAGS, CXX14_CXXFLAGS)
(CXX17_CXXFLAGS, ENABLE_CXX11): New.
* tests/atlocal.in: Receive them.

* examples/variant.yy: Don't define things in std.
* examples/variant-11.test, examples/variant-11.yy: New.
Check the support of move-only types.
* examples/README, examples/local.mk: Adjust.
 2018-09-13 19:01:33 +02:00
Akim Demaille
333bcd2ee3 build: fix support for --disable-dependency-tracking 
Reported by Juan Manuel Guerrero.
https://lists.gnu.org/archive/html/bug-bison/2014-07/msg00000.html.

* examples/local.mk (%D%/extracted.stamp): Make sure the output
directory exists.
* examples/extexi (process): Likewise.
 2018-09-09 15:14:20 +02:00
Akim Demaille
e1c33f04d1 build: work around warnings in Flex 
See ea0db44fed.  We also need to disable
the warning in the examples (but don't want to clutter the
documentation with such details).

* doc/bison.texi (scanner.ll): Disable Clang's -Wdocumentation.
While at it, hide the other kludges.
 2018-09-08 12:13:29 +02:00
Akim Demaille
d908fb3f18 examples: beware of shell portability issues 
This completes 2d7e743802.

Some shells don't grok "local var=`cmd`" very well: they need the rhs
to be quoted.

    ./examples/test: 72: local: you.,: bad variable name
    FAIL examples/variant.test (exit status: 2)

Reported by Étienne Renault.

* examples/test (run): Quote the values in 'local' assignments.
 2018-09-06 13:51:19 +02:00
Akim Demaille
2d7e743802 examples: beware of shell portability issues 
Some shells don't grok `local var=$val` very well: they need the rhs
to be quoted.

    ./examples/test: 66: local: you.,: bad variable name
    FAIL examples/variant.test (exit status: 2)

Reported by Étienne Renault.

* examples/test (run): Quote the values in 'local' assignments.
 2018-09-02 09:37:53 +02:00
Akim Demaille
de64159e7f examples: calc++: a Makefile and a README 
* examples/calc++/Makefile, examples/calc++/README: New.
* examples/calc++/local.mk: Ship and install them.
* doc/bison.texi: Formatting changes.
 2018-08-25 08:49:26 +02:00
Akim Demaille
e504c843c1 examples: fix the leading empty line 
* examples/extexi: Really avoid the first empty line.
Remove useless `next`.
 2018-08-23 19:16:11 +02:00
Akim Demaille
3fda8335bf examples: shorten the name of the calc++ files 
* doc/bison.texi: Turn the calc++- prefix into calc++/.
* examples/extexi (%file_wanted): Replace with
(&file_wanted): this.
* examples/calc++/local.mk: Adjust.
 2018-08-23 13:37:52 +02:00
Akim Demaille
32e0fd1a99 examples: add empty lines 
Currently the examples are too dense, let's put empty lines where
'#line' would be issued.  And also remove some spurious empty
lines (remains from @group, @end group, etc.).

* examples/extexi: Do that.
* examples/local.mk (extexiFLAGS): Rename as...
(EXTEXIFLAGS): this.
 2018-08-19 17:47:59 +02:00
Akim Demaille
b610f43f25 examples: check the variant example 
* examples/mfcalc/local.mk, examples/rpcalc/local.mk: Define the
programs in a more natural order, source, preproc, then linker.

* examples/test: Be ready to work on programs that are not in
a subdir.
* examples/variant.test: New.
* examples/local.mk: Use it.
* examples/variant.yy: Don't use 0 for nullptr.
Use a more natural output for a list of string.
 2018-08-19 17:47:59 +02:00
Akim Demaille
bbd17b68fb examples: fix Englishoes 
* examples/README: Fix my mistakes.
 2018-08-14 13:40:54 +02:00
Akim Demaille
30c179fee8 examples: ship and install variant.yy 
This file was meant to be shown as an example.  Install it.

* README, data/README: Put Emacs metadata in the final section.
* examples/README: New.
* examples/variant.yy: Use %empty.
* examples/local.mk: Install both these files.
 2018-08-14 13:36:47 +02:00
Akim Demaille
2e9e591889 Update copyright years 
Run `make update-copyright`.
 2018-05-12 18:18:41 +02:00
Akim Demaille
370a302f34 Examples: improve C++ style 
* examples/variant.yy: Prefer vector to list.
Remove useless inline.
 2018-05-12 14:04:04 +02:00
Akim Demaille
dbd1609311 style: don't use std::endl 
* data/lalr1.cc, doc/bison.texi, etc/bench.pl.in, examples/variant.yy,
* tests/actions.at, tests/atlocal.in, tests/c++.at, tests/headers.at,
* tests/local.at, tests/types.at:
Don't use std::endl, it flushes uselessly, and is considered bad
style.
 2018-05-08 12:35:06 +02:00
Akim Demaille
3209eb1c4c package: bump to 2015 
Which also requires:

* gnulib: Update.
 2015-01-04 17:49:13 +01:00
Akim Demaille
fc51acddb4 package: bump to 2014 
* AUTHORS, ChangeLog-2012, Makefile.am, NEWS, PACKAGING, README,
* README-alpha, README-hacking, THANKS, TODO, bootstrap.conf,
* build-aux/darwin11.4.0.valgrind, build-aux/local.mk,
* build-aux/update-b4-copyright,
* build-aux/update-package-copyright-year, cfg.mk, configure.ac,
* data/README, data/bison.m4, data/c++-skel.m4, data/c++.m4,
* data/c-like.m4, data/c-skel.m4, data/c.m4, data/glr.c, data/glr.cc,
* data/java-skel.m4, data/java.m4, data/lalr1.cc, data/lalr1.java,
* data/local.mk, data/location.cc, data/stack.hh, data/variant.hh,
* data/xslt/bison.xsl, data/xslt/xml2dot.xsl, data/xslt/xml2text.xsl,
* data/xslt/xml2xhtml.xsl, data/yacc.c, djgpp/Makefile.maint,
* djgpp/README.in, djgpp/config.bat, djgpp/config.sed,
* djgpp/config.site, djgpp/config_h.sed, djgpp/djunpack.bat,
* djgpp/local.mk, djgpp/subpipe.c, djgpp/subpipe.h,
* djgpp/testsuite.sed, doc/bison.texi, doc/local.mk, doc/refcard.tex,
* etc/README, etc/bench.pl.in, etc/local.mk,
* examples/calc++/calc++.test, examples/calc++/local.mk,
* examples/extexi, examples/local.mk, examples/mfcalc/local.mk,
* examples/mfcalc/mfcalc.test, examples/rpcalc/local.mk,
* examples/rpcalc/rpcalc.test, examples/test, examples/variant.yy,
* lib/abitset.c, lib/abitset.h, lib/bbitset.h, lib/bitset.c,
* lib/bitset.h, lib/bitset_stats.c, lib/bitset_stats.h,
* lib/bitsetv-print.c, lib/bitsetv-print.h, lib/bitsetv.c,
* lib/bitsetv.h, lib/ebitset.c, lib/ebitset.h, lib/get-errno.c,
* lib/get-errno.h, lib/lbitset.c, lib/lbitset.h, lib/libiberty.h,
* lib/local.mk, lib/main.c, lib/timevar.c, lib/timevar.def,
* lib/timevar.h, lib/vbitset.c, lib/vbitset.h, lib/yyerror.c,
* m4/bison-i18n.m4, m4/c-working.m4, m4/cxx.m4, m4/flex.m4,
* m4/timevar.m4, src/AnnotationList.c, src/AnnotationList.h,
* src/InadequacyList.c, src/InadequacyList.h, src/LR0.c, src/LR0.h,
* src/Sbitset.c, src/Sbitset.h, src/assoc.c, src/assoc.h,
* src/closure.c, src/closure.h, src/complain.c, src/complain.h,
* src/conflicts.c, src/conflicts.h, src/derives.c, src/derives.h,
* src/files.c, src/files.h, src/flex-scanner.h, src/getargs.c,
* src/getargs.h, src/gram.c, src/gram.h, src/graphviz.c,
* src/graphviz.h, src/ielr.c, src/ielr.h, src/lalr.c, src/lalr.h,
* src/local.mk, src/location.c, src/location.h, src/main.c,
* src/muscle-tab.c, src/muscle-tab.h, src/named-ref.c,
* src/named-ref.h, src/nullable.c, src/nullable.h, src/output.c,
* src/output.h, src/parse-gram.c, src/parse-gram.y, src/print-xml.c,
* src/print-xml.h, src/print.c, src/print.h, src/print_graph.c,
* src/print_graph.h, src/reader.c, src/reader.h, src/reduce.c,
* src/reduce.h, src/relation.c, src/relation.h, src/scan-code.h,
* src/scan-code.l, src/scan-gram.h, src/scan-gram.l, src/scan-skel.h,
* src/scan-skel.l, src/state.c, src/state.h, src/symlist.c,
* src/symlist.h, src/symtab.c, src/symtab.h, src/system.h,
* src/tables.c, src/tables.h, src/uniqstr.c, src/uniqstr.h,
* tests/actions.at, tests/atlocal.in, tests/bison.in, tests/c++.at,
* tests/calc.at, tests/conflicts.at, tests/cxx-type.at,
* tests/existing.at, tests/glr-regression.at, tests/headers.at,
* tests/input.at, tests/java.at, tests/javapush.at, tests/local.at,
* tests/local.mk, tests/named-refs.at, tests/output.at, tests/push.at,
* tests/reduce.at, tests/regression.at, tests/sets.at,
* tests/skeletons.at, tests/synclines.at, tests/testsuite.at,
* tests/torture.at, tests/types.at:
here.
 2014-02-03 15:27:02 +01:00
Akim Demaille
b167e7ba0d package: install the examples 
Currently, we do not install the various examples extracted from the
documentation.  Let's do it, as they are useful starting points.

* configure.ac: When --enable-gcc-warnings is set, enable ENABLE_GCC_WARNINGS.
* examples/extexi: No longer issue synclines by default.
* examples/local.mk: Except if ENABLE_GCC_WARNINGS.
* examples/calc++/local.mk, examples/mfcalc/local.mk,
* examples/rpcalc/local.mk: Install the example files.
 2013-12-09 16:53:14 +01:00
Akim Demaille
afc4457605 build: use Automake 1.14's non-recursive Makefile features 
* configure.ac: Require Automake 1.14.
* examples/calc++/local.mk, examples/local.mk, examples/mfcalc/local.mk,
* examples/rpcalc/local.mk, tests/local.mk: Use %D% and %C%.
 2013-11-05 14:32:20 +01:00
Paul Eggert
0bfe22b6d5 maint: git now ignores rpcalc 
* examples/rpcalc/.gitignore: Ignore rpcalc.
 2013-10-21 15:23:43 -07:00
Paul Eggert
3a684d611e build: examples/calc++/calc++ requires flex 
* configure.ac (FLEX_CXX_WORKS): New AM_CONDITIONAL.
* examples/calc++/local.mk (examples/calc++/calc++):
Build if FLEX_CXX_WORKS, not BISON_CXX_WORKS.
 2013-10-21 15:23:42 -07:00
Akim Demaille
b51cf830a6 examples: improve the output of the "variant" example 
* examples/variant.yy: Improve the printing of lists.
 2013-09-19 15:57:59 +02:00
Paul Eggert
1d91bfdf1c build: port to pre-5.8.7 perl 
* examples/local.mk (extract): Omit -f from perl options.
This doesn't work with perl versions before 5.8.7
that are configured without USE_SITECUSTOMIZE.
Reported by Michael Felt in
<http://lists.gnu.org/archive/html/bug-bison/2013-08/msg00006.html>.
 2013-08-24 07:55:47 -07:00
Akim Demaille
0fcc2e9a74 build: ship all the files, even if the C++ compiler is broken 
* examples/calc++/local.mk: Be sure to ship calc++.test even if
the current C++ compiler is not sufficient to run the tests.
 2013-06-11 16:36:38 +02:00
Akim Demaille
5ae8eb3202 tests: fix failures with G++ 4.8 in Flex scanner 
* configure.ac (WARN_NO_NULL_CONVERSION_CXXFLAGS): Rename as...
(FLEX_SCANNER_CXXFLAGS): this.
Pass -Wno-zero-as-null-pointer-constant to G++ if it supports it.
* examples/calc++/local.mk: Adjust.
 2013-02-19 17:42:33 +01:00
Theophile Ranquet
be6fa942ac variants: avoid type punning issue 
This is based on what is recommended by both Scott Meyers, in 'Effective
C++', and Andrei Alexandrescu and Herb Sutter in 'C++ Coding Standards'.

Use a static_cast on void* rather than directly use a reinterpret_cast,
which can have nefarious effects on objects.  However, even though following
this guideline is good practice in general, I am not quite sure how relevant
it is when applied to conversions from POD to objects.  Actually, it might
very well be the opposite: isn't this exactly what reinterpret_cast is for?
What we really want *is* to transmit the memory map as a series of bytes,
which, if I am correct, falls into the kind of "low level" hack for which
this cast is meant.

In any case, this silences the warning, which will be greatly appreciated by
anyone using variants with a compiler supporting -fstrict-aliasing.

* data/variant.hh (as): Here.
* tests/c++.at (Exception safety, C++ Variant-based Symbols, Variants):
Don't use NO_STRICT_ALIAS_CXXFLAGS (revert commit ddb9db15), as type punning
is no longer an issue.
* tests/atlocal.in, configure.ac (NO_STRICT_ALIAS_CXXFLAGS): Remove
definition.
* examples/local.mk (NO_STRICT_ALIAS_CXXFLAGS): Remove from AM_CXXFLAGS.
* doc/bison.texi: Don't mention type punning issues.
 2013-02-01 15:06:20 +01:00
Akim Demaille
1217688141 build: please Clang++ 3.2+ on Flex scanners 
Clang++, with -Wall, rejects code generated by Flex (for C scanners):

  CXX      examples/calc++/examples_calc___calc__-calc++-scanner.o
  In file included from examples/calc++/calc++-scanner.cc:1:
  error: implicit conversion of NULL constant to 'bool' [-Werror,-Wnull-conversion]
  if ( ! ( (yy_buffer_stack) ? (yy_buffer_stack)[(yy_buffer_stack_top)] : __null) ) {
       ~                                                                  ^~~~~~
                                                                          false
* configure.ac (WARN_NO_NULL_CONVERSION_CXXFLAGS): Compute it.
* examples/calc++/local.mk (examples_calc___calc___CXXFLAGS): Use it.
 2013-01-30 16:10:00 +01:00
Akim Demaille
7d6bad1959 maint: update copyright years 
Suggested by Stefano Lattarini.
Run "make update-copyright".
 2013-01-12 16:14:16 +01:00
Akim Demaille
304b384ea3 examples: minor improvements 
* examples/variant.yy: Don't use debug_stream(), obsoleted.
Use <*>.
 2012-12-26 10:38:59 +01:00
Akim Demaille
ae8880deec doc: update variant usage 
* doc/bison.texi, examples/variant.yy: Use "%define api.value.type variant",
instead of "%define variant".
 2012-12-26 10:31:42 +01:00
Akim Demaille
a89a5b1442 tests: be robust to set -e. 
* examples/test (run): here.
 2012-12-21 13:24:51 +01:00