make-obstacks-texi.pl: New.

contrib/
2013-03-06  Tobias Burnus  <burnus@net-b.de>

        * make-obstacks-texi.pl: New.

libiberty/
2013-03-06  Tobias Burnus  <burnus@net-b.de>

        * libiberty.texi: Update comment, remove lowersections.
        * obstacks.texi: Regenerate.

From-SVN: r196486

contrib/ChangeLog

@@ -1,3 +1,7 @@
+2013-03-06  Tobias Burnus  <burnus@net-b.de>
+
+	* make-obstacks-texi.pl: New.
+
 2013-02-27  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
 
 	* make_sunver.pl: Enforce C locale.

contrib/make-obstacks-texi.pl

@@ -0,0 +1,46 @@
+#!/usr/bin/perl -w
+
+# (C) 2013 Free Software Foundation
+# Contributed by Tobias Burnus
+#
+# This script is Free Software, and it can be copied, distributed and
+# modified as defined in the GNU General Public License.  A copy of
+# its license can be downloaded from http://www.gnu.org/copyleft/gpl.html
+
+use strict;
+use File::Basename;
+
+
+if ($#ARGV != 0 or $ARGV[0] eq "")  {
+   my $name = basename($0);
+
+   print "\nUSAGE: `$name` memory.texi\n\n";
+   print "Reads GLIBC's manual/memory.texi and extracts the obstacks section\n"
+        ."Redirect the output to update GCC's libiberty/obstacks.texi\n\n";
+   exit 1;
+}
+
+open (IN, "<$ARGV[0]") || die "Cannot open '$ARGV[0]': $!";
+my $data = join ("", <IN>);
+close (IN);
+
+$data =~ s/.*\@node Obstacks\n/\@node Obstacks\n/s;
+$data =~ s/\n\@node [^\n]+\n\@subsection.*/\n/s;
+
+# Add refs to GLIBC
+$data =~ s/(\@p?xref{[^}]*)}/$1, , , libc, The GNU C Library Reference Manual}/gs;
+
+
+# And undo the refs which are in this file
+my @nodes = grep /^\@node /, (split /\n/, $data);
+
+foreach my $node (@nodes) {
+  $node =~ s/\@node //;
+  $node =~ s/,.*//;
+  $node =~ s/ / *\n?/g;
+  chomp ($node);
+
+  $data =~ s/(\@p?xref{$node), , , libc, The GNU C Library Reference Manual}/$1}/gsi;
+}
+
+print $data;

libiberty/ChangeLog

@@ -1,3 +1,8 @@
+2013-03-06  Tobias Burnus  <burnus@net-b.de>
+
+	* libiberty.texi: Update comment, remove lowersections.
+	* obstacks.texi: Regenerate.
+
 2013-03-05  Jakub Jelinek  <jakub@redhat.com>
 
 	PR middle-end/56526

libiberty/libiberty.texi

@@ -241,13 +241,8 @@ central location from which to use, maintain, and distribute them.
 * Obstacks::                     Stacks of arbitrary objects.
 @end menu
 
-@c This is generated from the glibc manual using a make-obstacks-texi.sh
+@c This is generated from the glibc manual using contrib/make-obstacks-texi.pl
-@c script of Phil's.  Hope it's accurate.
-@lowersections
-@lowersections
 @include obstacks.texi
-@raisesections
-@raisesections
 
 @node Functions
 @chapter Function, Variable, and Macro Listing.

libiberty/obstacks.texi

@@ -1,5 +1,5 @@
 @node Obstacks
-@chapter Obstacks
+@subsection Obstacks
 @cindex obstacks
 
 An @dfn{obstack} is a pool of memory containing a stack of objects.  You
@@ -33,7 +33,7 @@ the padding needed to start each object on a suitable boundary.
 @end menu
 
 @node Creating Obstacks
-@section Creating Obstacks
+@subsubsection Creating Obstacks
 
 The utilities for manipulating obstacks are declared in the header
 file @file{obstack.h}.
@@ -74,7 +74,7 @@ directly or indirectly.  You must also supply a function to free a chunk.
 These matters are described in the following section.
 
 @node Preparing for Obstacks
-@section Preparing for Using Obstacks
+@subsubsection Preparing for Using Obstacks
 
 Each source file in which you plan to use the obstack functions
 must include the header file @file{obstack.h}, like this:
@@ -160,7 +160,7 @@ obstack_alloc_failed_handler = &my_obstack_alloc_failed;
 @end defvar
 
 @node Allocation in an Obstack
-@section Allocation in an Obstack
+@subsubsection Allocation in an Obstack
 @cindex allocation (obstacks)
 
 The most direct way to allocate an object in an obstack is with
@@ -233,7 +233,7 @@ Contrast this with the previous example of @code{savestring} using
 @code{malloc} (@pxref{Basic Allocation, , , libc, The GNU C Library Reference Manual}).
 
 @node Freeing Obstack Objects
-@section Freeing Objects in an Obstack
+@subsubsection Freeing Objects in an Obstack
 @cindex freeing (obstacks)
 
 To free an object allocated in an obstack, use the function
@@ -265,7 +265,7 @@ frees the chunk (@pxref{Preparing for Obstacks}).  Then other
 obstacks, or non-obstack allocation, can reuse the space of the chunk.
 
 @node Obstack Functions
-@section Obstack Functions and Macros
+@subsubsection Obstack Functions and Macros
 @cindex macros
 
 The interfaces for using obstacks may be defined either as functions or
@@ -321,7 +321,7 @@ various language extensions in GNU C permit defining the macros so as to
 compute each argument only once.
 
 @node Growing Objects
-@section Growing Objects
+@subsubsection Growing Objects
 @cindex growing objects (in obstacks)
 @cindex changing the size of a block (obstacks)
 
@@ -435,7 +435,7 @@ the current object smaller.  Just don't try to shrink it beyond zero
 length---there's no telling what will happen if you do that.
 
 @node Extra Fast Growing
-@section Extra Fast Growing Objects
+@subsubsection Extra Fast Growing Objects
 @cindex efficiency and obstacks
 
 The usual functions for growing objects incur overhead for checking
@@ -538,7 +538,7 @@ add_string (struct obstack *obstack, const char *ptr, int len)
 @end smallexample
 
 @node Status of an Obstack
-@section Status of an Obstack
+@subsubsection Status of an Obstack
 @cindex obstack status
 @cindex status of obstack
 
@@ -580,12 +580,13 @@ obstack_next_free (@var{obstack-ptr}) - obstack_base (@var{obstack-ptr})
 @end deftypefun
 
 @node Obstacks Data Alignment
-@section Alignment of Data in Obstacks
+@subsubsection Alignment of Data in Obstacks
 @cindex alignment (in obstacks)
 
 Each obstack has an @dfn{alignment boundary}; each object allocated in
 the obstack automatically starts on an address that is a multiple of the
-specified boundary.  By default, this boundary is 4 bytes.
+specified boundary.  By default, this boundary is aligned so that
+the object can hold any type of data.
 
 To access an obstack's alignment boundary, use the macro
 @code{obstack_alignment_mask}, whose function prototype looks like
@@ -597,7 +598,9 @@ this:
 The value is a bit mask; a bit that is 1 indicates that the corresponding
 bit in the address of an object should be 0.  The mask value should be one
 less than a power of 2; the effect is that all object addresses are
-multiples of that power of 2.  The default value of the mask is 3, so that
+multiples of that power of 2.  The default value of the mask is a value
+that allows aligned objects to hold any type of data: for example, if
+its value is 3, any type of data can be stored at locations whose
 addresses are multiples of 4.  A mask value of 0 means an object can start
 on any multiple of 1 (that is, no alignment is required).
 
@@ -620,7 +623,7 @@ This will finish a zero-length object and then do proper alignment for
 the next object.
 
 @node Obstack Chunks
-@section Obstack Chunks
+@subsubsection Obstack Chunks
 @cindex efficiency of chunks
 @cindex chunks
 
@@ -676,7 +679,7 @@ if (obstack_chunk_size (obstack_ptr) < @var{new-chunk-size})
 @end smallexample
 
 @node Summary of Obstacks
-@section Summary of Obstack Functions
+@subsubsection Summary of Obstack Functions
 
 Here is a summary of all the functions associated with obstacks.  Each
 takes the address of an obstack (@code{struct obstack *}) as its first