path: root/gcc/vec.cc

/* Vector API for GNU compiler.
   Copyright (C) 2004-2025 Free Software Foundation, Inc.
   Contributed by Nathan Sidwell <nathan@codesourcery.com>
   Re-implemented in C++ by Diego Novillo <dnovillo@google.com>

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.

GCC 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 General Public License
for more details.

You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3.  If not see
<http://www.gnu.org/licenses/>.  */

/* This file is compiled twice: once for the generator programs
   once for the compiler.  */
#ifdef GENERATOR_FILE
#include "bconfig.h"
#else
#include "config.h"
#endif

#include "system.h"
#include "coretypes.h"
#include "hash-table.h"
#include "selftest.h"
#ifdef GENERATOR_FILE
#include "errors.h"
#else
#include "input.h"
#include "diagnostic-core.h"
#endif

/* Vector memory usage.  */
class vec_usage: public mem_usage
{
public:
  /* Default constructor.  */
  vec_usage (): m_items (0), m_items_peak (0), m_element_size (0) {}

  /* Constructor.  */
  vec_usage (size_t allocated, size_t times, size_t peak,
	     size_t items, size_t items_peak, size_t element_size)
    : mem_usage (allocated, times, peak),
    m_items (items), m_items_peak (items_peak),
    m_element_size (element_size) {}

  /* Sum the usage with SECOND usage.  */
  vec_usage
  operator+ (const vec_usage &second)
  {
    return vec_usage (m_allocated + second.m_allocated,
		      m_times + second.m_times,
		      m_peak + second.m_peak,
		      m_items + second.m_items,
		      m_items_peak + second.m_items_peak, 0);
  }

  /* Dump usage coupled to LOC location, where TOTAL is sum of all rows.  */
  inline void
  dump (mem_location *loc, mem_usage &total) const
  {
    char s[4096];
    sprintf (s, "%s:%i (%s)", loc->get_trimmed_filename (),
	     loc->m_line, loc->m_function);

    s[48] = '\0';

    fprintf (stderr,
	     "%-48s %10" PRIu64 PRsa (10) ":%4.1f%%" PRsa (9) "%10" PRIu64
	     ":%4.1f%%" PRsa (10) PRsa (10) "\n",
	     s,
	     (uint64_t)m_element_size,
	     SIZE_AMOUNT (m_allocated),
	     m_allocated * 100.0 / total.m_allocated,
	     SIZE_AMOUNT (m_peak), (uint64_t)m_times,
	     m_times * 100.0 / total.m_times,
	     SIZE_AMOUNT (m_items), SIZE_AMOUNT (m_items_peak));
  }

  /* Dump footer.  */
  inline void
  dump_footer ()
  {
    fprintf (stderr, "%s" PRsa (64) PRsa (25) PRsa (16) "\n",
	     "Total", SIZE_AMOUNT (m_allocated),
	     SIZE_AMOUNT (m_times), SIZE_AMOUNT (m_items));
  }

  /* Dump header with NAME.  */
  static inline void
  dump_header (const char *name)
  {
    fprintf (stderr, "%-48s %10s%11s%16s%10s%17s%11s\n", name, "sizeof(T)",
	     "Leak", "Peak", "Times", "Leak items", "Peak items");
  }

  /* Current number of items allocated.  */
  size_t m_items;
  /* Peak value of number of allocated items.  */
  size_t m_items_peak;
  /* Size of element of the vector.  */
  size_t m_element_size;
};

/* Vector memory description.  */
static mem_alloc_description <vec_usage> vec_mem_desc;

/* Account the overhead.  */

void
vec_prefix::register_overhead (void *ptr, size_t elements,
			       size_t element_size MEM_STAT_DECL)
{
  vec_mem_desc.register_descriptor (ptr, VEC_ORIGIN, false
				    FINAL_PASS_MEM_STAT);
  vec_usage *usage
    = vec_mem_desc.register_instance_overhead (elements * element_size, ptr);
  usage->m_element_size = element_size;
  usage->m_items += elements;
  if (usage->m_items_peak < usage->m_items)
    usage->m_items_peak = usage->m_items;
}

/* Notice that the memory allocated for the vector has been freed.  */

void
vec_prefix::release_overhead (void *ptr, size_t size, size_t elements,
			      bool in_dtor MEM_STAT_DECL)
{
  if (!vec_mem_desc.contains_descriptor_for_instance (ptr))
    vec_mem_desc.register_descriptor (ptr, VEC_ORIGIN,
				      false FINAL_PASS_MEM_STAT);
  vec_usage *usage = vec_mem_desc.release_instance_overhead (ptr, size,
							     in_dtor);
  usage->m_items -= elements;
}

/* Calculate the number of slots to reserve a vector, making sure that
   it is of at least DESIRED size by growing ALLOC exponentially.  */

unsigned
vec_prefix::calculate_allocation_1 (unsigned alloc, unsigned desired)
{
  /* We must have run out of room.  */
  gcc_assert (alloc < desired);

  /* Exponential growth. */
  if (!alloc)
    alloc = 4;
  else if (alloc < 16)
    /* Double when small.  */
    alloc = alloc * 2;
  else
    /* Grow slower when large.  */
    alloc = (alloc * 3 / 2);

  /* If this is still too small, set it to the right size. */
  if (alloc < desired)
    alloc = desired;
  return alloc;
}

/* Dump per-site memory statistics.  */

void
dump_vec_loc_statistics (void)
{
  vec_mem_desc.dump (VEC_ORIGIN);
}

/* Gets the next token from STR delimited by DELIMS (deliminator not included
   in returned string).

   Updates STR to be the remaining string after the given token.

   STR and DELIMS must both be valid string_slices.

   If there aren't any of the chars in DELIM in STR (ie no more tokens in STR)
   then returns the string, and updates STR to be invalid.  */
string_slice
string_slice::tokenize (string_slice *str, string_slice delims)
{
  const char *ptr = str->begin ();

  gcc_assert (str->is_valid () && delims.is_valid ());

  for (; ptr < str->end (); ptr++)
    for (char c : delims)
      if (*ptr == c)
	{
	  /* Update the input string to be the remaining string.  */
	  const char *str_begin = str->begin ();
	  *str = string_slice (ptr  + 1, str->end ());
	  return string_slice (str_begin, ptr);
	}

  /* If no deliminators between the start and end, return the whole string.  */
  string_slice res = *str;
  *str = string_slice::invalid ();
  return res;
}

/* Compares the string_slices STR1 and STR2 giving a lexograpical ordering.
   Returns -1 if STR1 comes before STR2, 1 if STR1 comes after, and 0 if the
   string_slices have the same contents.  */

int
string_slice::strcmp (string_slice str1, string_slice str2)
{
  for (unsigned int i = 0; i < str1.size () && i < str2.size (); i++)
    {
      if (str1[i] < str2[i])
	return -1;
      if (str1[i] > str2[i])
	return 1;
    }

  if (str1.size () < str2.size ())
    return -1;
  if (str1.size () > str2.size ())
    return 1;
  return 0;
}

string_slice
string_slice::strip ()
{
  const char *start = this->begin ();
  const char *end = this->end ();

  while (start < end && ISSPACE (*start))
    start++;
  while (end > start && ISSPACE (*(end-1)))
    end--;

  return string_slice (start, end);
}

#if CHECKING_P
/* Report qsort comparator CMP consistency check failure with P1, P2, P3 as
   witness elements.  */
ATTRIBUTE_NORETURN ATTRIBUTE_COLD
static void
qsort_chk_error (const void *p1, const void *p2, const void *p3,
		 sort_r_cmp_fn *cmp, void *data)
{
  if (!p3)
    {
      int r1 = cmp (p1, p2, data), r2 = cmp (p2, p1, data);
      error ("qsort comparator not anti-symmetric: %d, %d", r1, r2);
    }
  else if (p1 == p2)
    {
      int r = cmp (p1, p3, data);
      error ("qsort comparator non-negative on sorted output: %d", r);
    }
  else
    {
      int r1 = cmp (p1, p2, data);
      int r2 = cmp (p2, p3, data);
      int r3 = cmp (p1, p3, data);
      error ("qsort comparator not transitive: %d, %d, %d", r1, r2, r3);
    }
  internal_error ("qsort checking failed");
}

/* Verify anti-symmetry and transitivity for comparator CMP on sorted array
   of N SIZE-sized elements pointed to by BASE.  */
void
qsort_chk (void *base, size_t n, size_t size, sort_r_cmp_fn *cmp, void *data)
{
#if 0
#define LIM(n) (n)
#else
  /* Limit overall time complexity to O(n log n).  */
#define LIM(n) ((n) <= 16 ? (n) : 12 + floor_log2 (n))
#endif
#define ELT(i) ((const char *) base + (i) * size)
#define CMP(i, j) cmp (ELT (i), ELT (j), data)
#define ERR2(i, j) qsort_chk_error (ELT (i), ELT (j), NULL, cmp, data)
#define ERR3(i, j, k) qsort_chk_error (ELT (i), ELT (j), ELT (k), cmp, data)
  size_t i1, i2, i, j;
  /* This outer loop iterates over maximum spans [i1, i2) such that
     elements within each span compare equal to each other.  */
  for (i1 = 0; i1 < n; i1 = i2)
    {
      /* Position i2 one past last element that compares equal to i1'th.  */
      for (i2 = i1 + 1; i2 < n; i2++)
	if (CMP (i1, i2))
	  break;
	else if (CMP (i2, i1))
	  ERR2 (i1, i2);
      size_t lim1 = LIM (i2 - i1), lim2 = LIM (n - i2);
      /* Verify that other pairs within current span compare equal.  */
      for (i = i1 + 1; i + 1 < i2; i++)
	for (j = i + 1; j < i1 + lim1; j++)
	  if (CMP (i, j))
	    ERR3 (i, i1, j);
	  else if (CMP (j, i))
	    ERR2 (i, j);
      /* Verify that elements within this span compare less than
         elements beyond the span.  */
      for (i = i1; i < i2; i++)
	for (j = i2; j < i2 + lim2; j++)
	  if (CMP (i, j) >= 0)
	    ERR3 (i, i1, j);
	  else if (CMP (j, i) <= 0)
	    ERR2 (i, j);
    }
#undef ERR3
#undef ERR2
#undef CMP
#undef ELT
#undef LIM
}
#endif /* #if CHECKING_P */

#ifndef GENERATOR_FILE
#if CHECKING_P

namespace selftest {

/* Selftests.  */

/* Call V.safe_push for all ints from START up to, but not including LIMIT.
   Helper function for selftests.  */

static void
safe_push_range (vec <int>&v, int start, int limit)
{
  for (int i = start; i < limit; i++)
    v.safe_push (i);
}

/* Verify forms of initialization.  */

static void
test_init ()
{
  {
    vec<int> v1{ };
    ASSERT_EQ (0, v1.length ());

    vec<int> v2 (v1);
    ASSERT_EQ (0, v2.length ());
  }

  {
    vec<int> v1 = vec<int>();
    ASSERT_EQ (0, v1.length ());

    vec<int> v2 = v1;
    ASSERT_EQ (0, v2.length ());
  }

  {
    vec<int> v1 (vNULL);
    ASSERT_EQ (0, v1.length ());
    v1.safe_push (1);

    vec<int> v2 (v1);
    ASSERT_EQ (1, v1.length ());
    v2.safe_push (1);

    ASSERT_EQ (2, v1.length ());
    ASSERT_EQ (2, v2.length ());
    v1.release ();
  }
}

/* Verify that vec::quick_push works correctly.  */

static void
test_quick_push ()
{
  auto_vec <int> v;
  ASSERT_EQ (0, v.length ());
  v.reserve (3);
  ASSERT_EQ (0, v.length ());
  ASSERT_TRUE (v.space (3));
  v.quick_push (5);
  v.quick_push (6);
  v.quick_push (7);
  ASSERT_EQ (3, v.length ());
  ASSERT_EQ (5, v[0]);
  ASSERT_EQ (6, v[1]);
  ASSERT_EQ (7, v[2]);
}

/* Verify that vec::safe_push works correctly.  */

static void
test_safe_push ()
{
  auto_vec <int> v;
  ASSERT_EQ (0, v.length ());
  v.safe_push (5);
  v.safe_push (6);
  v.safe_push (7);
  ASSERT_EQ (3, v.length ());
  ASSERT_EQ (5, v[0]);
  ASSERT_EQ (6, v[1]);
  ASSERT_EQ (7, v[2]);
}

/* Verify that vec::truncate works correctly.  */

static void
test_truncate ()
{
  auto_vec <int> v;
  ASSERT_EQ (0, v.length ());
  safe_push_range (v, 0, 10);
  ASSERT_EQ (10, v.length ());

  v.truncate (5);
  ASSERT_EQ (5, v.length ());
}

/* Verify that vec::safe_grow_cleared works correctly.  */

static void
test_safe_grow_cleared ()
{
  auto_vec <int> v;
  ASSERT_EQ (0, v.length ());
  v.safe_grow_cleared (50, true);
  ASSERT_EQ (50, v.length ());
  ASSERT_EQ (0, v[0]);
  ASSERT_EQ (0, v[49]);
}

/* Verify that vec::pop works correctly.  */

static void
test_pop ()
{
  auto_vec <int> v;
  safe_push_range (v, 5, 20);
  ASSERT_EQ (15, v.length ());

  int last = v.pop ();
  ASSERT_EQ (19, last);
  ASSERT_EQ (14, v.length ());
}

/* Verify that vec::safe_insert works correctly.  */

static void
test_safe_insert ()
{
  auto_vec <int> v;
  safe_push_range (v, 0, 10);
  v.safe_insert (5, 42);
  ASSERT_EQ (4, v[4]);
  ASSERT_EQ (42, v[5]);
  ASSERT_EQ (5, v[6]);
  ASSERT_EQ (11, v.length ());
}

/* Verify that vec::ordered_remove works correctly.  */

static void
test_ordered_remove ()
{
  auto_vec <int> v;
  safe_push_range (v, 0, 10);
  v.ordered_remove (5);
  ASSERT_EQ (4, v[4]);
  ASSERT_EQ (6, v[5]);
  ASSERT_EQ (9, v.length ());
}

/* Verify that vec::ordered_remove_if works correctly.  */

static void
test_ordered_remove_if (void)
{
  auto_vec <int> v;
  safe_push_range (v, 0, 10);
  unsigned ix, ix2;
  int *elem_ptr;
  VEC_ORDERED_REMOVE_IF (v, ix, ix2, elem_ptr,
			 *elem_ptr == 5 || *elem_ptr == 7);
  ASSERT_EQ (4, v[4]);
  ASSERT_EQ (6, v[5]);
  ASSERT_EQ (8, v[6]);
  ASSERT_EQ (8, v.length ());

  v.truncate (0);
  safe_push_range (v, 0, 10);
  VEC_ORDERED_REMOVE_IF_FROM_TO (v, ix, ix2, elem_ptr, 0, 6,
				 *elem_ptr == 5 || *elem_ptr == 7);
  ASSERT_EQ (4, v[4]);
  ASSERT_EQ (6, v[5]);
  ASSERT_EQ (7, v[6]);
  ASSERT_EQ (9, v.length ());

  v.truncate (0);
  safe_push_range (v, 0, 10);
  VEC_ORDERED_REMOVE_IF_FROM_TO (v, ix, ix2, elem_ptr, 0, 5,
				 *elem_ptr == 5 || *elem_ptr == 7);
  VEC_ORDERED_REMOVE_IF_FROM_TO (v, ix, ix2, elem_ptr, 8, 10,
				 *elem_ptr == 5 || *elem_ptr == 7);
  ASSERT_EQ (4, v[4]);
  ASSERT_EQ (5, v[5]);
  ASSERT_EQ (6, v[6]);
  ASSERT_EQ (10, v.length ());

  v.truncate (0);
  safe_push_range (v, 0, 10);
  VEC_ORDERED_REMOVE_IF (v, ix, ix2, elem_ptr, *elem_ptr == 5);
  ASSERT_EQ (4, v[4]);
  ASSERT_EQ (6, v[5]);
  ASSERT_EQ (7, v[6]);
  ASSERT_EQ (9, v.length ());
}

/* Verify that vec::unordered_remove works correctly.  */

static void
test_unordered_remove ()
{
  auto_vec <int> v;
  safe_push_range (v, 0, 10);
  v.unordered_remove (5);
  ASSERT_EQ (9, v.length ());
}

/* Verify that vec::block_remove works correctly.  */

static void
test_block_remove ()
{
  auto_vec <int> v;
  safe_push_range (v, 0, 10);
  v.block_remove (5, 3);
  ASSERT_EQ (3, v[3]);
  ASSERT_EQ (4, v[4]);
  ASSERT_EQ (8, v[5]);
  ASSERT_EQ (9, v[6]);
  ASSERT_EQ (7, v.length ());
}

/* Comparator for use by test_qsort.  */

static int
reverse_cmp (const void *p_i, const void *p_j)
{
  return *(const int *)p_j - *(const int *)p_i;
}

/* Verify that vec::qsort works correctly.  */

static void
test_qsort ()
{
  auto_vec <int> v;
  safe_push_range (v, 0, 10);
  v.qsort (reverse_cmp);
  ASSERT_EQ (9, v[0]);
  ASSERT_EQ (8, v[1]);
  ASSERT_EQ (1, v[8]);
  ASSERT_EQ (0, v[9]);
  ASSERT_EQ (10, v.length ());
}

/* Verify that vec::reverse works correctly.  */

static void
test_reverse ()
{
  /* Reversing an empty vec ought to be a no-op.  */
  {
    auto_vec <int> v;
    ASSERT_EQ (0, v.length ());
    v.reverse ();
    ASSERT_EQ (0, v.length ());
  }

  /* Verify reversing a vec with even length.  */
  {
    auto_vec <int> v;
    safe_push_range (v, 0, 4);
    v.reverse ();
    ASSERT_EQ (3, v[0]);
    ASSERT_EQ (2, v[1]);
    ASSERT_EQ (1, v[2]);
    ASSERT_EQ (0, v[3]);
    ASSERT_EQ (4, v.length ());
  }

  /* Verify reversing a vec with odd length.  */
  {
    auto_vec <int> v;
    safe_push_range (v, 0, 3);
    v.reverse ();
    ASSERT_EQ (2, v[0]);
    ASSERT_EQ (1, v[1]);
    ASSERT_EQ (0, v[2]);
    ASSERT_EQ (3, v.length ());
  }
}

/* A test class that increments a counter every time its dtor is called.  */

class count_dtor
{
 public:
  count_dtor (int *counter) : m_counter (counter) {}
  ~count_dtor () { (*m_counter)++; }

 private:
  int *m_counter;
};

/* Verify that auto_delete_vec deletes the elements within it.  */

static void
test_auto_delete_vec ()
{
  int dtor_count = 0;
  {
    auto_delete_vec <count_dtor> v;
    v.safe_push (new count_dtor (&dtor_count));
    v.safe_push (new count_dtor (&dtor_count));
  }
  ASSERT_EQ (dtor_count, 2);
}

/* Verify accesses to vector elements are done indirectly.  */

static void
test_auto_alias ()
{
  volatile int i = 1;
  auto_vec<int, 8> v;
  v.quick_grow (2);
  v[0] = 1;
  v[1] = 2;
  int val;
  for (int ix = i; v.iterate (ix, &val); ix++)
    ASSERT_EQ (val, 2);
  ASSERT_EQ (val, 0);
}

static void
test_string_slice_initializers ()
{
  string_slice str1 = string_slice ();
  ASSERT_TRUE (str1.is_valid ());
  ASSERT_EQ (str1.size (), 0);

  string_slice str2 = string_slice ("Test string");
  ASSERT_TRUE (str2.is_valid ());
  ASSERT_EQ (str2.size (), 11);

  string_slice str3 = "Test string the second";
  ASSERT_TRUE (str3.is_valid ());
  ASSERT_EQ (str3.size (), 22);

  string_slice str4 = string_slice ("Test string", 4);
  ASSERT_TRUE (str4.is_valid ());
  ASSERT_EQ (str4.size (), 4);
}

static void
test_string_slice_tokenize ()
{
  string_slice test_string_slice = "";
  string_slice test_delims = ",";

  ASSERT_EQ (string_slice::tokenize (&test_string_slice, test_delims), "");
  ASSERT_FALSE (test_string_slice.is_valid ());

  test_string_slice = ",";
  test_delims = ",";
  ASSERT_EQ (string_slice::tokenize (&test_string_slice, test_delims),
	     string_slice (""));
  ASSERT_EQ (string_slice::tokenize (&test_string_slice, test_delims),
	     string_slice (""));
  ASSERT_FALSE (test_string_slice.is_valid ());

  test_string_slice = ",test.,.test, ,  test  ";
  test_delims = ",.";
  ASSERT_EQ (string_slice::tokenize (&test_string_slice, test_delims), "");
  ASSERT_EQ (string_slice::tokenize (&test_string_slice, test_delims), "test");
  ASSERT_EQ (string_slice::tokenize (&test_string_slice, test_delims), "");
  ASSERT_EQ (string_slice::tokenize (&test_string_slice, test_delims), "");
  ASSERT_EQ (string_slice::tokenize (&test_string_slice, test_delims), "test");
  ASSERT_EQ (string_slice::tokenize (&test_string_slice, test_delims), " ");
  ASSERT_EQ (string_slice::tokenize (&test_string_slice, test_delims),
	     "  test  ");
  ASSERT_FALSE (test_string_slice.is_valid ());

  const char *test_string
    = "This is the test string, it \0 is for testing, 123 ,,";
  test_string_slice = string_slice (test_string, 52);
  test_delims = string_slice (",\0", 2);

  ASSERT_EQ (string_slice::tokenize (&test_string_slice, test_delims),
	     "This is the test string");
  ASSERT_EQ (string_slice::tokenize (&test_string_slice, test_delims),
	     " it ");
  ASSERT_EQ (string_slice::tokenize (&test_string_slice, test_delims),
	     " is for testing");
  ASSERT_EQ (string_slice::tokenize (&test_string_slice, test_delims),
	     " 123 ");
  ASSERT_EQ (string_slice::tokenize (&test_string_slice, test_delims),
	     "");
  ASSERT_EQ (string_slice::tokenize (&test_string_slice, test_delims),
	     "");
  ASSERT_FALSE (test_string_slice.is_valid ());
}

static void
test_string_slice_strcmp ()
{
  ASSERT_EQ (string_slice::strcmp (string_slice (),
				   string_slice ()), 0);
  ASSERT_EQ (string_slice::strcmp (string_slice ("test"),
				   string_slice ()), 1);
  ASSERT_EQ (string_slice::strcmp (string_slice (),
				   string_slice ("test")), -1);
  ASSERT_EQ (string_slice::strcmp (string_slice ("test"),
				   string_slice ("test")), 0);
  ASSERT_EQ (string_slice::strcmp (string_slice ("a"),
				   string_slice ("b")), -1);
  ASSERT_EQ (string_slice::strcmp (string_slice ("b"),
				   string_slice ("a")), 1);
  ASSERT_EQ (string_slice::strcmp (string_slice ("ab", 1),
				   string_slice ("a")), 0);
  ASSERT_EQ (string_slice::strcmp (string_slice ("ab", 2),
				   string_slice ("a")), 1);
}

static void
test_string_slice_equality ()
{
  ASSERT_TRUE (string_slice () == string_slice ());
  ASSERT_FALSE (string_slice ("test") == string_slice ());
  ASSERT_FALSE ("test" == string_slice ());
  ASSERT_FALSE (string_slice () == string_slice ("test"));
  ASSERT_FALSE (string_slice () == "test");
  ASSERT_TRUE (string_slice ("test") == string_slice ("test"));
  ASSERT_TRUE ("test" == string_slice ("test"));
  ASSERT_TRUE (string_slice ("test") == "test");
  ASSERT_FALSE (string_slice ("a") == string_slice ("b"));
  ASSERT_FALSE ("a" == string_slice ("b"));
  ASSERT_FALSE (string_slice ("a") == "b");
  ASSERT_FALSE (string_slice ("b") == string_slice ("a"));
  ASSERT_TRUE (string_slice ("ab", 1) == string_slice ("a"));
  ASSERT_TRUE (string_slice ("ab", 1) == "a");
  ASSERT_FALSE (string_slice ("ab", 2) == string_slice ("a"));
  ASSERT_FALSE (string_slice ("ab", 2) == "a");
}

static void
test_string_slice_inequality ()
{
  ASSERT_FALSE (string_slice () != string_slice ());
  ASSERT_TRUE (string_slice ("test") != string_slice ());
  ASSERT_TRUE ("test" != string_slice ());
  ASSERT_TRUE (string_slice () != string_slice ("test"));
  ASSERT_TRUE (string_slice () != "test");
  ASSERT_FALSE (string_slice ("test") != string_slice ("test"));
  ASSERT_FALSE ("test" != string_slice ("test"));
  ASSERT_FALSE (string_slice ("test") != "test");
  ASSERT_TRUE (string_slice ("a") != string_slice ("b"));
  ASSERT_TRUE ("a" != string_slice ("b"));
  ASSERT_TRUE (string_slice ("a") != "b");
  ASSERT_TRUE (string_slice ("b") != string_slice ("a"));
  ASSERT_FALSE (string_slice ("ab", 1) != string_slice ("a"));
  ASSERT_FALSE (string_slice ("ab", 1) != "a");
  ASSERT_TRUE (string_slice ("ab", 2) != string_slice ("a"));
  ASSERT_TRUE (string_slice ("ab", 2) != "a");
}

static void
test_string_slice_invalid ()
{
  ASSERT_FALSE (string_slice::invalid ().is_valid ());
  ASSERT_FALSE (string_slice (NULL, 1).is_valid ());
  ASSERT_TRUE (string_slice (NULL, (size_t) 0).is_valid ());
  ASSERT_TRUE (string_slice ("Test", (size_t) 0).is_valid ());
  ASSERT_TRUE (string_slice ().is_valid ());
}

static void
test_string_slice_strip ()
{
  ASSERT_EQ (string_slice ("   test   ").strip (), string_slice ("test"));
  ASSERT_EQ (string_slice ("\t   test string\t   \n ").strip (),
	     string_slice ("test string"));
  ASSERT_EQ (string_slice ("test").strip (), string_slice ("test"));
  ASSERT_EQ (string_slice ().strip (), string_slice ());
  ASSERT_EQ (string_slice ("\t  \n \t   ").strip (), string_slice ());
}

/* Run all of the selftests within this file.  */

void
vec_cc_tests ()
{
  test_init ();
  test_quick_push ();
  test_safe_push ();
  test_truncate ();
  test_safe_grow_cleared ();
  test_pop ();
  test_safe_insert ();
  test_ordered_remove ();
  test_ordered_remove_if ();
  test_unordered_remove ();
  test_block_remove ();
  test_qsort ();
  test_reverse ();
  test_auto_delete_vec ();
  test_auto_alias ();
  test_string_slice_initializers ();
  test_string_slice_tokenize ();
  test_string_slice_strcmp ();
  test_string_slice_equality ();
  test_string_slice_inequality ();
  test_string_slice_invalid ();
  test_string_slice_strip ();
}

} // namespace selftest

#endif /* #if CHECKING_P */
#endif /* #ifndef GENERATOR_FILE */