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1144 Commits

Author SHA1 Message Date
Akim Demaille
f24afe4435 C++: style: fix indentation 
* data/variant.hh (b4_symbol_variant): De-indent, as the callers are
indented.
 2018-05-27 10:43:16 +02:00
Akim Demaille
928a817418 C++: style: prefer unsigned to unsigned int 
* data/c++.m4: here.
 2018-05-27 10:04:11 +02:00
Akim Demaille
ae8d777ad6 C++: style: space before paren 
* data/c++.m4, data/lalr1.cc: here.
 2018-05-27 10:04:11 +02:00
Akim Demaille
d17dc9a8b5 C++: fix -Wdeprecated warnings 
For instance on test 99:

    In file included from @@.cc:56:
    @@.hh:409:26: error: definition of implicit copy constructor for
                         'stack_symbol_type' is deprecated because it
                         has a user-declared copy assignment operator
                         [-Werror,-Wdeprecated]
          stack_symbol_type& operator= (const stack_symbol_type& that);
                         ^

Reported by Derek Clegg.
https://lists.gnu.org/archive/html/bison-patches/2018-05/msg00036.html

* configure.ac (warn_tests): Add -Wdeprecated.
* data/lalr1.cc (stack_symbol_type): Add an explicit copy ctor.
We cannot rely on the explicit default implementation (`= default`)
as we support C++ 98.
 2018-05-27 10:03:57 +02:00
Akim Demaille
2e9e591889 Update copyright years 
Run `make update-copyright`.
 2018-05-12 18:18:41 +02:00
Akim Demaille
2b5a27ba3d Avoid compiler warnings 
At least GCC 7.3, with -O1 or -O2 (but not -O0 or -O3) generates
warnings with -Wnull-dereference when using yyformat: it fails to see
yyformat cannot be null.

Reported by Frank Heckenbach, https://savannah.gnu.org/patch/?9620.

* configure.ac: Use -Wnull-dereference if supported.
* data/glr.c, data/lalr1.cc, data/yacc.c: Define yyformat in such
a way that GCC cannot not see that yyformat is defined.
Using `default: abort();` also addresses the issue, but forces
the inclusion of `stdlib.h`, which we avoid.
 2018-05-12 13:29:14 +02:00
Akim Demaille
d132c2d545 C++: fix uses of inline 
Sometimes `inline` would be used in *.cc files on symbols that are not
exported (useless but harmless), and sometimes on exported symbols
such as the constructor of syntax_error (harmful: linking fails).

Reported several times, including:

- by Dennis T
  http://lists.gnu.org/archive/html/bug-bison/2016-03/msg00002.html
- by Frank Heckenbach
  https://savannah.gnu.org/patch/?9616

* data/c++.m4 (b4_inline): New: expands to `inline` or nothing.
Use it where appropriate.
* data/lalr1.cc: Use it where appropriate.

* tests/c++.at (Syntax error as exception): Put the scanner in another
compilation unit to exercise the constructor of syntax_error.
 2018-05-10 17:33:18 +02:00
Akim Demaille
bb45005671 C++: remove useless inline in CC files 
* data/glr.cc, data/lalr1.cc: Remove `inline` from implementations
that are not in headers.
 2018-05-10 16:57:51 +02:00
Akim Demaille
0afeaa2ab7 C++: remove useless inline on templates 
Templates are implicitly `inline`.

* data/c++.m4, data/lalr1.cc: Remove `inline` from templates.
 2018-05-10 16:11:58 +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
476c1cca59 lalr1, yacc: use the default location as initial error location 
Currently lalr1.cc makes an out-of-bound access when trying to read @1
in rules with an empty rhs (i.e., when there is no @1) that raises an
error (YYERROR).

glr.c already gracefully handles this by using @$ as initial location
for the errors.  Let's do that in yacc.c and lalr1.cc.

* data/lalr1.cc, data/yacc.c: Use @$ to initialize the error location.
* tests/actions.at: Check that case.
 2015-08-12 13:56:07 +02:00
Akim Demaille
55fb68aabf style: formatting and comment changes 
* data/glr.c: Avoid empty lines.
* data/lalr1.cc: Use the same comments as in glr.c and yacc.c.
 2015-08-12 13:56:07 +02:00
Akim Demaille
0d40b36417 c++: style: use "unsigned", not "unsigned int" 
This style appears to be more traditional, at least in C++.
For instance in the standard, [facets.examples].
There are occurrences using "unsigned int" too though.

* data/lalr1.cc, data/location.cc, data/stack.hh: here.
 2015-08-12 13:56:06 +02:00
Akim Demaille
b809770efb c++: style: remove useless "inline" and fix space issues 
* data/lalr1.cc, data/c++.m4: Formatting changes.
* data/stack.hh: Remove useless "inline".
Add documentation.
* data/location.cc: Prefer {} for empty bodies.
 2015-08-12 13:56:06 +02:00
Akim Demaille
a2c525b34c build: re-enable compiler warnings, and fix them 
There are warnings (-Wextra) in generated C++ code:

  ltlparse.cc: In member function 'ltlyy::parser::symbol_number_type
  ltlyy::parser::by_state::type_get() const':
  ltlparse.cc:452:33: warning: enumeral and non-enumeral type in
  conditional expression
      return state == empty_state ? empty_symbol : yystos_[state];

Reported by Alexandre Duret-Lutz.

It turns out that -Wall and -Wextra were disabled because of a stupid
typo.

* configure.ac: Fix the stupid typo.
* data/lalr1.cc, src/AnnotationList.c, src/InadequacyList.c,
* src/ielr.c, src/print.c, src/scan-code.l, src/symlist.c,
* src/symlist.h, src/symtab.c, src/tables.c, tests/actions.at,
* tests/calc.at, tests/cxx-type.at, tests/glr-regression.at,
* tests/named-refs.at, tests/torture.at:
Fix warnings, mostly issues about variables used only with assertions,
which are disabled with -DNDEBUG.
 2015-01-23 07:52:50 +01:00
Akim Demaille
573654ca9e c++: reserve 200 slots in the parser's stack 
This is consistent with what is done with yacc.c and glr.c.  Because
it also avoids that the stack needs to be resized very soon, it should
help keeping tests about destructors more reliable.

Indeed, if the stack is created too small, very soon the C++ library
needs to enlarge it, which means creating a new one, copying the
elements from the initial one onto it, and then destroy the elements
of the initial stack: that would be a spurious call to a destructor.

Reported by Thomas Jahns.
http://lists.gnu.org/archive/html/bug-bison/2015-01/msg00059.html

* data/stack.hh (stack::stack): Reserve 200 slots.
* tests/c++.at: Remove traces of stack expansions.
 2015-01-20 20:45:48 +01:00
Akim Demaille
559b30881d doc: minor fixes 
* doc/bison.texi: Fix warnings about colon in reference names.
* data/bison.m4, src/files.h: Fix comments.
* doc/Doxyfile.in: update.
 2015-01-16 10:52:17 +01:00
Akim Demaille
3e82dfaa0d c++: avoid warnings when destructors don't use $$ 
* data/c++.m4: here.
 2015-01-15 14:29:22 +01:00
Akim Demaille
ee028dceff c++: fix the use of destructors when variants are enabled 
When using variants, destructors generate invalid code.
<http://lists.gnu.org/archive/html/bug-bison/2014-09/msg00005.html>
Reported by Michael Catanzaro.

* data/c++.m4 (~basic_symbol): b4_symbol_foreach works on yysym:
define it.
* tests/c++.at (Variants): Check it.
 2015-01-09 13:54:58 +01:00
Akim Demaille
821394a3c8 c++: symbols can be empty, so use it 
The previous patches ensure that symbols (symbol_type and
stack_symbol_type) can be empty, cleared, and their emptiness can be
checked.  Therefore, yyempty, which codes whether yyla is empty or
not, is now useless.

In C skeletons (e.g., yacc.c), the fact that the lookahead is empty is
coded by "yychar = YYEMPTY", which is exactly what this patch
restores, since yychar/yytoken corresponds to yyla.type.

* data/lalr1.cc (yyempty): Remove.
Rather, depend on yyla.empty ().
 2015-01-08 16:07:59 +01:00
Akim Demaille
00cebd11d4 c++: variants: don't leak the lookahead in error recovery 
During error recovery, when discarding the lookeahead, we don't
destroy it, which is caught by parse.assert assertions.

Reported by Antonio Silva Correia.
With an analysis and suggested patch from Michel d'Hooge.
<http://savannah.gnu.org/support/?108481>

* tests/c++.at (Variants): Strengthen the test to try syntax errors
with discarded lookahead.
 2015-01-08 16:07:59 +01:00
Akim Demaille
ee2f433512 c++: provide a means to clear symbols 
The symbol destructor is currently the only means to clear a symbol.
Unfortunately during error recovery we might have to clear the
lookahead, which is a local variable (yyla) that has not yet reached
its end of scope.

Rather that duplicating the code to destroy a symbol, or rather than
destroying and recreating yyla, let's provide a means to clear a
symbol.

Reported by Antonio Silva Correia, with an analysis from Michel d'Hooge.
<http://savannah.gnu.org/support/?108481>

* data/c++.m4, data/lalr1.cc (basis_symbol::clear, by_state::clear)
(by_type::clear): New.
(basic_symbol::~basic_symbol): Use clear.
 2015-01-08 16:07:59 +01:00
Akim Demaille
5422471cbb c++: clean up the handling of empty symbols 
* data/c++.m4, data/lalr1.cc (yyempty_): Remove, replaced by...
(empty_symbol, by_state::empty_state): these.
(basic_symbol::empty): New.
 2015-01-08 14:45:42 +01:00
Akim Demaille
8a4ec3595b c++: comment and style changes 
* data/c++.m4, data/lalr1.cc: More documentation.
Tidy.
* tests/c++.at (string_cast): Rename as...
(to_string): this C++11 name.
 2015-01-08 11:25:07 +01:00
Akim Demaille
7cf84b13a0 c++: variants: comparing addresses of typeid.name() is undefined 
Instead of storing and comparing pointers to names of types, store
pointers to the typeids, and compares the typeids.
Reported by Thomas Jahns.
<http://lists.gnu.org/archive/html/bug-bison/2014-03/msg00001.html>

* data/variant.hh (yytname_): Replace with...
(yytypeid_): this.
 2015-01-07 10:34:07 +01:00
Akim Demaille
56351d4c7b c++: locations: complete the API and fix comments 
There are no support for += between locations, and some comments are wrong.
Reported by Alexandre Duret-Lutz.

* data/location.cc: Fix.
* doc/bison.texi: Document.
* tests/c++.at: Check.
 2015-01-05 18:32:23 +01:00
Akim Demaille
827bc59ca1 %union: fix the support for named %union 
Bison supports a union tag, for obscure reasons.  But it does a poor
job at it, especially since Bison 3.0.
Reported by Stephen Cameron and Tobias Frost.

It did not ensure that the name was not given several times.  An easy
way to do this is to make the %union tag be handled as a %define
variable, as they cannot be defined several times.

Since Bison 3.0, the synclines were wrongly placed, resulting in
invalid code.  Addressing this issue, because of the way the union tag
was stored (as a code muscle), would have been tedious.  Unless we
rather define the %union tag as a %percent variable, whose synclines
are easier to manipulate.

So replace the b4_union_name muscle by the api.value.union.name
%define variable, document, and check.

* data/bison.m4: Make sure that api.value.union.name has a keyword value.
* data/c++.m4: Make sure that api.value.union.name is not defined.
* data/c.m4 (b4_union_name): No longer use it, use api.value.union.name.
* doc/bison.texi (%define Summary): Document it.
* src/parse-gram.y (union_name): No longer define b4_uion_name, but
api.value.union.name.
* tests/input.at (Redefined %union name): New.
* tests/synclines.at (%union name syncline): New.
* tests/types.at: Check named %unions.
 2015-01-04 18:00:51 +01:00
Akim Demaille
3209eb1c4c package: bump to 2015 
Which also requires:

* gnulib: Update.
 2015-01-04 17:49:13 +01:00
Akim Demaille
8d4dc896cb yacc.c: fix broken union when api.value.type=union and %defines are used 
Reported by Rich Wilson.

* data/c.m4 (b4_symbol_type_register): Append to b4_union_members,
not b4_user_union_members.
The latter invokes the former, but it is the former which is reinitialized
to empty by b4_value_type_setup_union.
* tests/types.at: Check it.

This reveals another bug, this time in the case of glr.c parsers.

* data/glr.c: Generate the header file before the implementation file,
to be sure that the setup is run before what depends on it.
 2014-12-31 14:39:05 +01:00
Akim Demaille
b702ec61ab location: remove some ugly debugging code traces 
* data/location.cc: here.
 2014-02-03 15:27:03 +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
be29c71dd8 xml: also use "%empty" with html output 
* data/xslt/xml2xhtml.xsl: No longer issue an Epsilon, display as in
dot and text formats.
 2013-11-26 16:28:22 +01:00
Akim Demaille
f3d2a1b2ac xml: also display %empty for empty right-hand sides 
* data/xslt/xml2dot.xsl, data/xslt/xml2text.xsl: Display %empty where needed.
 2013-11-26 16:20:52 +01:00
Akim Demaille
44186fc4ec lalr1.cc: formatting changes 
* data/lalr1.cc: Fix indentation.
 2013-11-15 10:14:06 +01:00
Akim Demaille
5c77412162 lalr1.cc: fix the support of YYERROR with variants 
When variant are enabled, the yylhs variable (the left-hand side of
the rule being reduced, i.e. $$ and @$) is explicitly destroyed when
YYERROR is called.  This is because before running the user code, $$
is initialized, so that the user can properly use it.

However, when quitting yyparse, yylhs is also reclaimed by the C++
compiler: the variable goes out of scope.

Instead of trying to be too smart, let the compiler do its job: reduce
the scope of yylhs to exactly the reduction.  This way, whatever the
type of scope exit (regular, exception, return, goto...) this variable
will be properly reclaimed.

Reported by Paolo Simone Gasparello.
<http://lists.gnu.org/archive/html/bug-bison/2013-10/msg00003.html>

* data/lalr1.cc (yyparse): Reduce the scope of yylhs.
* tests/c++.at: We now pass this test.
 2013-11-15 10:14:05 +01:00
Akim Demaille
edb2e90531 skeletons: use better names when computing a "goto" 
* data/glr.c (yyLRgotoState): Name the symbol argument yysym, instead
of yylhs.
* data/lalr1.cc (yy_lr_goto_state_): Likewise.
* data/lalr1.java (yy_lr_goto_state_): New, modeled after the previous
two routines.
Use it.
 2013-11-14 16:26:16 +01:00
Akim Demaille
8d0b7cef7d parsers: rename YY_NULL as YY_NULLPTR to avoid conflicts with Flex 
Flex also defines YY_NULL (to 0).  Avoid gratuitous conflicts.

* data/c.m4 (b4_null_define): Rename YY_NULL as YY_NULLPTR.

* data/glr.c, data/lalr1.cc, data/location.cc, data/variant.hh,
* data/yacc.c, src/parse-gram.c, tests/actions.at, tests/c++.at,
* tests/cxx-type.at, tests/glr-regression.at, tests/headers.at,
* tests/push.at, tests/regression.at:
Adjust.
 2013-11-08 10:52:15 +01:00
Akim Demaille
ad9d4f9f2e c++: use __attribute__((__pure__)) to avoid warnings 
Building C++ parsers with -Wsuggest-attribute=const and
-Wsuggest-attribute=noreturn triggers warning in generated code.

* data/lalr1.cc: Call b4_attribute_define.
(debug_stream, debug_level): Flag as pure.
* tests/headers.at (Several parsers): There are now more YY macros
that "leak".
 2013-11-05 10:44:03 +01:00
Akim Demaille
3cc83855d9 skeletons: update the handling of compiler attributes 
* data/c.m4 (b4_attribute_define): Instead of defining __attribute__,
define YY_ATTRIBUTE conditionally.
(YY_ATTRIBUTE_PURE, YY_ATTRIBUTE_UNUSED, _Noreturn): New.
Use them.
* data/glr.c: Use them.
 2013-11-05 10:44:03 +01:00
Akim Demaille
a810712331 c++: fix generated doxygen comments 
* configure.ac: Enable -Wdocumentation if supported.
* data/lalr1.cc: Fix comments.
 2013-10-22 16:31:57 +02:00
Akim Demaille
ae7cd18c98 style: variant: remove empty line 
* data/variant.hh (b4_symbol_constructor_define_): Remove
stray eol.
 2013-09-19 16:45:09 +02:00
Akim Demaille
77482f2783 glr: more assertions 
* data/glr.c (yyaddDeferredAction, yyglrShiftDefer, yypdumpstack):
More assertions.
 2013-09-19 15:58:00 +02:00
Akim Demaille
5a6e85fb8d glr: shorten scopes 
* data/glr.c (yyglrReduce): Define yyflag with its value.
 2013-09-19 15:57:59 +02:00
Akim Demaille
9e87ff5472 glr: formatting changes 
* data/glr.c: here.
 2013-09-19 15:57:59 +02:00
Akim Demaille
3afe18fd1f glr: better use of tracing macros 
* data/glr.c (yydestroyGLRState): Use YY_SYMBOL_PRINT instead of
yy_symbol_print.
 2013-09-19 15:57:59 +02:00
Akim Demaille
66b03e134f variant: remove useless assertion 
* data/variant.hh (move): Remove precondition assertion which is
ensured by the first call of the body (this precondition is also one
of "build").
 2013-09-19 15:57:59 +02:00
Akim Demaille
d3ae5af6ec yacc: beware of "uninitialized uses" warnings 
Again some issues with the fact that yylval is reported by GCC as
possibly not initialized in some cases.  Here, the case at hand is the
%destructor.

I am still not convinced that it is worth going all the trouble of
using pragmas to disable temporarily some warnings, instead of just
initializing the looking symbol once for all, but that's what Paul
voted for, see
<http://lists.gnu.org/archive/html/bison-patches/2012-10/msg00050.html>.

* data/c.m4 (b4_attribute_define): Define
YY_IGNORE_MAYBE_UNINITIALIZED_BEGIN, YY_IGNORE_MAYBE_UNINITIALIZED_END,
YY_INITIAL_VALUE here, as we will need them in the generation of the
destructor function, which is defined in yacc.c before yyparse, which
was in charge of defining these macros.
* data/yacc.c (b4_declare_scanner_communication_variables): Simplify:
trying to factor the definitions of the case pure and impure is
too complex.
Actually, it is not even clear that this macro should really exist,
as even the calls are complex.
Be careful not to issue a lone ";", as this is a statement, and C90
forbids declarations after statements ; so write
"YY_INITIAL_VALUE(Decl;)", not "YY_INITIAL_VALUE(Decl);".
 2013-07-25 17:53:59 +02:00
Akim Demaille
45c64fa627 java: rename YYMORE as YYPUSH_MORE for consistency with C 
http://lists.gnu.org/archive/html/bison-patches/2013-06/msg00008.html

* data/lalr1.java, doc/bison.texi, tests/javapush.at:
s/YYMORE/YYPUSH_MORE.
 2013-06-24 09:37:18 +02:00
Akim Demaille
1d678854a4 java: push: do not reset the error counter 
* data/lalr1.java (parse): here, when in push-pull is in "both" mode.
This breaks the test suite, for instance
make check TESTSUITEFLAGS='-d 388 BISON_USE_PUSH_FOR_PULL=1'.
More generally make maintainer-push-check.
 2013-06-21 11:17:05 +02:00
Dennis Heimbigner
aa94def12d java: add push-parser support 
* data/lalr1.java: Capture the declarations as m4 macros to avoid
duplication.  When push parsing, the declarations occur at the class
instance level rather than within the parse() function.

Change the way that the parser state is initialized.  For
push-parsing, the parse state declarations are moved to
"push_parse_initialize()", which is called on the first invocation of
"push_parse()". The %initial-action code is also inserted after the
invocation of "push_parse_initialize()".

The body of the parse loop is modified to return values at appropriate
points when doing push parsing.  In order to make push parsing work,
it is necessary to divide YYNEWSTATE into two states: YYNEWSTATE and
YYGETTOKEN. On the first call to push_parse(), the state is
YYNEWSTATE. On all later entries, the state is set to YYGETTOKEN. The
YYNEWSTATE switch arm falls through into YYGETTOKEN. YYGETTOKEN
indicates that a new token is potentially needed.  Normally, with a
pull parser, this new token would be obtained by calling "yylex()". In
the push parser, the value YYMORE is returned to the caller. On the
next call to push_parse(), the parser will return to the YYGETTOKEN
state and continue operation.

* tests/javapush.at: New test file for java push parsing.
* tests/testsuite.at: Use it.
* tests/local.mk: Adjust.
* doc/bison.texi (Java Push Parser Interface): New.

Signed-off-by: Akim Demaille <akim@lrde.epita.fr>
 2013-06-13 10:38:14 +02:00