Ok, 3 major changes for debug mode in one commit:
1. I had been detecting and trapping iterator == and \!= among iterators
in different containers as an error. But the trapping itself is actually
an error.
Consider:
#include <iostream>
#include <vector>
#include <algorithm>
template <class C>
void
display(const C& c)
{
std::cout << "{";
bool first = true;
for (const auto& x : c)
{
if (\!first)
std::cout << ", ";
first = false;
std::cout << x;
}
std::cout << "}\n";
}
int
main()
{
typedef std::vector<int> V;
V v1 = {1, 3, 5};
V v2 = {2, 4, 6};
display(v1);
display(v2);
V::iterator i = std::find(v1.begin(), v1.end(), 1);
V::iterator j = std::find(v2.begin(), v2.end(), 2);
if (*i == *j)
i = j; // perfectly legal
// ...
if (i \!= j) // the only way to check
v2.push_back(*i);
display(v1);
display(v2);
}
It is legal to assign an iterator from one container to another of the
same type. This is required to work. One might want to test whether or
not such an assignment had been made. The way one performs such a check
is using the iterator's ==, \!= operator. This is a logical and necessary
function and does not constitute an error.
2. I had a header circular dependence bug when _LIBCPP_DEBUG2 is defined.
This caused a problem in several of the libc++ tests.
Fixed.
3. There is a serious problem when _LIBCPP_DEBUG2=1 at the moment in that
std::basic_string is inoperable. std::basic_string uses __wrap_iterator
to implement its iterators. __wrap_iterator has been rigged up in debug
mode to support vector. But string hasn't been rigged up yet. This means
that one gets false positives when using std::string in debug mode. I've
upped std::string's priority in www/debug_mode.html.
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@187636 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/__hash_table b/include/__hash_table
index 0f72294..a8d9222 100644
--- a/include/__hash_table
+++ b/include/__hash_table
@@ -20,6 +20,12 @@
#include <__undef_min_max>
+#ifdef _LIBCPP_DEBUG2
+# include <__debug>
+#else
+# define _LIBCPP_ASSERT(x, m) ((void)0)
+#endif
+
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#pragma GCC system_header
#endif
@@ -181,10 +187,6 @@
friend _LIBCPP_INLINE_VISIBILITY
bool operator==(const __hash_iterator& __x, const __hash_iterator& __y)
{
-#if _LIBCPP_DEBUG_LEVEL >= 2
- _LIBCPP_ASSERT(__get_const_db()->__comparable(&__x, &__y),
- "Attempted to compare non-comparable unordered container iterator");
-#endif
return __x.__node_ == __y.__node_;
}
friend _LIBCPP_INLINE_VISIBILITY
@@ -329,10 +331,6 @@
friend _LIBCPP_INLINE_VISIBILITY
bool operator==(const __hash_const_iterator& __x, const __hash_const_iterator& __y)
{
-#if _LIBCPP_DEBUG_LEVEL >= 2
- _LIBCPP_ASSERT(__get_const_db()->__comparable(&__x, &__y),
- "Attempted to compare non-comparable unordered container const_iterator");
-#endif
return __x.__node_ == __y.__node_;
}
friend _LIBCPP_INLINE_VISIBILITY
@@ -467,10 +465,6 @@
friend _LIBCPP_INLINE_VISIBILITY
bool operator==(const __hash_local_iterator& __x, const __hash_local_iterator& __y)
{
-#if _LIBCPP_DEBUG_LEVEL >= 2
- _LIBCPP_ASSERT(__get_const_db()->__comparable(&__x, &__y),
- "Attempted to compare non-comparable unordered container local_iterator");
-#endif
return __x.__node_ == __y.__node_;
}
friend _LIBCPP_INLINE_VISIBILITY
@@ -636,10 +630,6 @@
friend _LIBCPP_INLINE_VISIBILITY
bool operator==(const __hash_const_local_iterator& __x, const __hash_const_local_iterator& __y)
{
-#if _LIBCPP_DEBUG_LEVEL >= 2
- _LIBCPP_ASSERT(__get_const_db()->__comparable(&__x, &__y),
- "Attempted to compare non-comparable unordered container local_const_iterator");
-#endif
return __x.__node_ == __y.__node_;
}
friend _LIBCPP_INLINE_VISIBILITY