Prepare for radical source tree reorganization. zack/build-layout-experiment

All top-level files and directories are moved into a temporary storage
directory, REORG.TODO, except for files that will certainly still
exist in their current form at top level when we're done (COPYING,
COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which
are moved to the new directory OldChangeLogs, instead), and the
generated file INSTALL (which is just deleted; in the new order, there
will be no generated files checked into version control).

1 files changed, 363 insertions, 0 deletions

diff --git a/REORG.TODO/string/strcoll_l.c b/REORG.TODO/string/strcoll_l.c
new file mode 100644
index 0000000000..8fd55b000a
--- /dev/null
+++ b/REORG.TODO/string/strcoll_l.c
@@ -0,0 +1,363 @@
+/* Copyright (C) 1995-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Written by Ulrich Drepper <drepper@gnu.org>, 1995.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+
+#include <assert.h>
+#include <langinfo.h>
+#include <locale.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <string.h>
+#include <sys/param.h>
+
+#ifndef STRING_TYPE
+# define STRING_TYPE char
+# define USTRING_TYPE unsigned char
+# define STRCOLL __strcoll_l
+# define STRCMP strcmp
+# define WEIGHT_H "../locale/weight.h"
+# define SUFFIX	MB
+# define L(arg) arg
+#endif
+
+#define CONCAT(a,b) CONCAT1(a,b)
+#define CONCAT1(a,b) a##b
+
+#include "../locale/localeinfo.h"
+#include WEIGHT_H
+
+/* Track status while looking for sequences in a string.  */
+typedef struct
+{
+  int len;			/* Length of the current sequence.  */
+  size_t val;			/* Position of the sequence relative to the
+				   previous non-ignored sequence.  */
+  size_t idxmax;		/* Maximum index in sequences.  */
+  size_t idxcnt;		/* Current count of indices.  */
+  size_t backw;			/* Current Backward sequence index.  */
+  size_t backw_stop;		/* Index where the backward sequences stop.  */
+  const USTRING_TYPE *us;	/* The string.  */
+  unsigned char rule;		/* Saved rule for the first sequence.  */
+  int32_t idx;			/* Index to weight of the current sequence.  */
+  int32_t save_idx;		/* Save looked up index of a forward
+				   sequence after the last backward
+				   sequence.  */
+  const USTRING_TYPE *back_us;	/* Beginning of the backward sequence.  */
+} coll_seq;
+
+/* Get next sequence.  Traverse the string as required.  */
+static __always_inline void
+get_next_seq (coll_seq *seq, int nrules, const unsigned char *rulesets,
+	      const USTRING_TYPE *weights, const int32_t *table,
+	      const USTRING_TYPE *extra, const int32_t *indirect,
+	      int pass)
+{
+  size_t val = seq->val = 0;
+  int len = seq->len;
+  size_t backw_stop = seq->backw_stop;
+  size_t backw = seq->backw;
+  size_t idxcnt = seq->idxcnt;
+  size_t idxmax = seq->idxmax;
+  int32_t idx = seq->idx;
+  const USTRING_TYPE *us = seq->us;
+
+  while (len == 0)
+    {
+      ++val;
+      if (backw_stop != ~0ul)
+	{
+	  /* There is something pushed.  */
+	  if (backw == backw_stop)
+	    {
+	      /* The last pushed character was handled.  Continue
+		 with forward characters.  */
+	      if (idxcnt < idxmax)
+		{
+		  idx = seq->save_idx;
+		  backw_stop = ~0ul;
+		}
+	      else
+		{
+		  /* Nothing anymore.  The backward sequence ended with
+		     the last sequence in the string.  Note that len is
+		     still zero.  */
+		  idx = 0;
+		  break;
+	        }
+	    }
+	  else
+	    {
+	      /* XXX Traverse BACKW sequences from the beginning of
+		 BACKW_STOP to get the next sequence.  Is ther a quicker way
+	         to do this?  */
+	      size_t i = backw_stop;
+	      us = seq->back_us;
+	      while (i < backw)
+		{
+		  int32_t tmp = findidx (table, indirect, extra, &us, -1);
+		  idx = tmp & 0xffffff;
+		  i++;
+		}
+	      --backw;
+	      us = seq->us;
+	    }
+	}
+      else
+	{
+	  backw_stop = idxmax;
+	  int32_t prev_idx = idx;
+
+	  while (*us != L('\0'))
+	    {
+	      int32_t tmp = findidx (table, indirect, extra, &us, -1);
+	      unsigned char rule = tmp >> 24;
+	      prev_idx = idx;
+	      idx = tmp & 0xffffff;
+	      idxcnt = idxmax++;
+
+	      /* Save the rule for the first sequence.  */
+	      if (__glibc_unlikely (idxcnt == 0))
+	        seq->rule = rule;
+
+	      if ((rulesets[rule * nrules + pass]
+		   & sort_backward) == 0)
+		/* No more backward characters to push.  */
+		break;
+	      ++idxcnt;
+	    }
+
+	  if (backw_stop >= idxcnt)
+	    {
+	      /* No sequence at all or just one.  */
+	      if (idxcnt == idxmax || backw_stop > idxcnt)
+		/* Note that len is still zero.  */
+		break;
+
+	      backw_stop = ~0ul;
+	    }
+	  else
+	    {
+	      /* We pushed backward sequences.  If the stream ended with the
+		 backward sequence, then we process the last sequence we
+		 found.  Otherwise we process the sequence before the last
+		 one since the last one was a forward sequence.  */
+	      seq->back_us = seq->us;
+	      seq->us = us;
+	      backw = idxcnt;
+	      if (idxmax > idxcnt)
+		{
+		  backw--;
+		  seq->save_idx = idx;
+		  idx = prev_idx;
+		}
+	      if (backw > backw_stop)
+		backw--;
+	    }
+	}
+
+      /* With GCC 5.3 when compiling with -Os the compiler complains
+	 that idx, taken from seq->idx (seq1 or seq2 from STRCOLL) may
+	 be used uninitialized.  In general this can't possibly be true
+	 since seq1.idx and seq2.idx are initialized to zero in the
+	 outer function.  Only one case where seq->idx is restored from
+	 seq->save_idx might result in an uninitialized idx value, but
+	 it is guarded by a sequence of checks against backw_stop which
+	 ensures that seq->save_idx was saved to first and contains a
+	 valid value.  */
+      DIAG_PUSH_NEEDS_COMMENT;
+      DIAG_IGNORE_Os_NEEDS_COMMENT (5, "-Wmaybe-uninitialized");
+      len = weights[idx++];
+      DIAG_POP_NEEDS_COMMENT;
+      /* Skip over indices of previous levels.  */
+      for (int i = 0; i < pass; i++)
+	{
+	  idx += len;
+	  len = weights[idx];
+	  idx++;
+	}
+    }
+
+  /* Update the structure.  */
+  seq->val = val;
+  seq->len = len;
+  seq->backw_stop = backw_stop;
+  seq->backw = backw;
+  seq->idxcnt = idxcnt;
+  seq->idxmax = idxmax;
+  seq->us = us;
+  seq->idx = idx;
+}
+
+/* Compare two sequences.  */
+static __always_inline int
+do_compare (coll_seq *seq1, coll_seq *seq2, int position,
+	    const USTRING_TYPE *weights)
+{
+  int seq1len = seq1->len;
+  int seq2len = seq2->len;
+  size_t val1 = seq1->val;
+  size_t val2 = seq2->val;
+  int idx1 = seq1->idx;
+  int idx2 = seq2->idx;
+  int result = 0;
+
+  /* Test for position if necessary.  */
+  if (position && val1 != val2)
+    {
+      result = val1 > val2 ? 1 : -1;
+      goto out;
+    }
+
+  /* Compare the two sequences.  */
+  do
+    {
+      if (weights[idx1] != weights[idx2])
+	{
+	  /* The sequences differ.  */
+	  result = weights[idx1] - weights[idx2];
+	  goto out;
+	}
+
+      /* Increment the offsets.  */
+      ++idx1;
+      ++idx2;
+
+      --seq1len;
+      --seq2len;
+    }
+  while (seq1len > 0 && seq2len > 0);
+
+  if (position && seq1len != seq2len)
+    result = seq1len - seq2len;
+
+out:
+  seq1->len = seq1len;
+  seq2->len = seq2len;
+  seq1->idx = idx1;
+  seq2->idx = idx2;
+  return result;
+}
+
+int
+STRCOLL (const STRING_TYPE *s1, const STRING_TYPE *s2, __locale_t l)
+{
+  struct __locale_data *current = l->__locales[LC_COLLATE];
+  uint_fast32_t nrules = current->values[_NL_ITEM_INDEX (_NL_COLLATE_NRULES)].word;
+  /* We don't assign the following values right away since it might be
+     unnecessary in case there are no rules.  */
+  const unsigned char *rulesets;
+  const int32_t *table;
+  const USTRING_TYPE *weights;
+  const USTRING_TYPE *extra;
+  const int32_t *indirect;
+
+  if (nrules == 0)
+    return STRCMP (s1, s2);
+
+  /* Catch empty strings.  */
+  if (__glibc_unlikely (*s1 == '\0') || __glibc_unlikely (*s2 == '\0'))
+    return (*s1 != '\0') - (*s2 != '\0');
+
+  rulesets = (const unsigned char *)
+    current->values[_NL_ITEM_INDEX (_NL_COLLATE_RULESETS)].string;
+  table = (const int32_t *)
+    current->values[_NL_ITEM_INDEX (CONCAT(_NL_COLLATE_TABLE,SUFFIX))].string;
+  weights = (const USTRING_TYPE *)
+    current->values[_NL_ITEM_INDEX (CONCAT(_NL_COLLATE_WEIGHT,SUFFIX))].string;
+  extra = (const USTRING_TYPE *)
+    current->values[_NL_ITEM_INDEX (CONCAT(_NL_COLLATE_EXTRA,SUFFIX))].string;
+  indirect = (const int32_t *)
+    current->values[_NL_ITEM_INDEX (CONCAT(_NL_COLLATE_INDIRECT,SUFFIX))].string;
+
+  assert (((uintptr_t) table) % __alignof__ (table[0]) == 0);
+  assert (((uintptr_t) weights) % __alignof__ (weights[0]) == 0);
+  assert (((uintptr_t) extra) % __alignof__ (extra[0]) == 0);
+  assert (((uintptr_t) indirect) % __alignof__ (indirect[0]) == 0);
+
+  int result = 0, rule = 0;
+
+  coll_seq seq1, seq2;
+  seq1.len = 0;
+  seq1.idxmax = 0;
+  seq1.rule = 0;
+  seq2.len = 0;
+  seq2.idxmax = 0;
+
+  for (int pass = 0; pass < nrules; ++pass)
+    {
+      seq1.idxcnt = 0;
+      seq1.idx = 0;
+      seq2.idx = 0;
+      seq1.backw_stop = ~0ul;
+      seq1.backw = ~0ul;
+      seq2.idxcnt = 0;
+      seq2.backw_stop = ~0ul;
+      seq2.backw = ~0ul;
+
+      /* We need the elements of the strings as unsigned values since they
+	 are used as indices.  */
+      seq1.us = (const USTRING_TYPE *) s1;
+      seq2.us = (const USTRING_TYPE *) s2;
+
+      /* We assume that if a rule has defined `position' in one section
+	 this is true for all of them.  Please note that the localedef programs
+	 makes sure that `position' is not used at the first level.  */
+
+      int position = rulesets[rule * nrules + pass] & sort_position;
+
+      while (1)
+	{
+	  get_next_seq (&seq1, nrules, rulesets, weights, table,
+				    extra, indirect, pass);
+	  get_next_seq (&seq2, nrules, rulesets, weights, table,
+				    extra, indirect, pass);
+	  /* See whether any or both strings are empty.  */
+	  if (seq1.len == 0 || seq2.len == 0)
+	    {
+	      if (seq1.len == seq2.len)
+		{
+		  /* Both strings ended and are equal at this level.  Do a
+		     byte-level comparison to ensure that we don't waste time
+		     going through multiple passes for totally equal strings
+		     before proceeding to subsequent passes.  */
+		  if (pass == 0 && STRCMP (s1, s2) == 0)
+		    return result;
+		  else
+		    break;
+	        }
+
+	      /* This means one string is shorter than the other.  Find out
+		 which one and return an appropriate value.  */
+	      return seq1.len == 0 ? -1 : 1;
+	    }
+
+	  result = do_compare (&seq1, &seq2, position, weights);
+	  if (result != 0)
+	    return result;
+	}
+
+      rule = seq1.rule;
+    }
+
+  return result;
+}
+libc_hidden_def (STRCOLL)
+
+#ifndef WIDE_CHAR_VERSION
+weak_alias (__strcoll_l, strcoll_l)
+#endif