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gcc-8 produces "attribute directive ignored" warning for
no_sanitize("unsigned-integer-overflow"); at some point gcc will
introduce integer sanitizer support and we'll have to do this all over
again but for now just don't emit the attribute.
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We were using << compact_alignment_log2 instead of * compact_alignment
for symmetry with the encoding where >> is crucial to keep code fast and
round to negative infinity.
For decoding, the results are the same and any reasonable compiler
should convert *4 into <<2 so just use a multiplication - that doesn't
trigger UB on negative numbers.
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We were using allocate_memory to allocate struct xml_extra_buffer that
contains pointers; with compact mode, this allocation can be misaligned
by 4b with 8b pointers; fix this by manually realigning the pointer.
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We were misaligning document data on 64-bit platforms by placing 8b
pointers at 4b offsets; fix this by reserving a full pointer worth of
bytes for page marker.
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* Adds noexcept specifiers to the move special members of xml_document, but only #ifndef PUGIXML_COMPACT
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* Adds a macro definition to be able to use noexcept with supporting compilers
* Adds noexcept specifier to move special members of xpath_node_set, xpath_variable_set and xpath_query, but not of xml_document as it has a throwing implementation
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Texas Instruments compiler produces this warning for unused template
member functions:
"pugixml.cpp", line 253: warning #179-D: function
"pugi::impl::<unnamed>::auto_deleter<T>::release [with
T=pugi::impl::<unnamed>::xml_stream_chunk<char>]" was declared but
never referenced
As far as I can tell, this is a compiler issue - these functions should
not be instantiated in the first place; while it's possible to rework
the code to work around this, the changes would be fragile. It seems
best to just disable this warning - we've seen something similar on SNC
(which appears to use the same frontend!..).
Fixes #182.
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It looks like there are several cases where this might happen:
- In some MinGW distributions, the LLONG_MIN/etc defines are guarded
with:
#if !defined(__STRICT_ANSI__) && defined(__GNUC__)
Which means that you don't get them in strict ANSI mode. The previous
workaround was specifically targeted towards this.
- In some GCC distributions (notably GCC 6.3.0 in some configurations),
LLONG_MIN/etc. defines are guarded with:
#if (defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L)
But __STDC_VERSION__ isn't defined as C99 even if you use -std=c++14 -
which is probably technically valid, but not useful.
To work around this, redefine the symbols whenever we are building with
GCC and we need them and they aren't defined - doing this is better than
not building. Instead of hard-coding the constants, use GCC-specific
__LONG_LONG_MAX__ to compute them.
Fixes #181.
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This makes it a bit faster and matches other internal code better.
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The static_buffer optimization seems to come from the time where the
on-heap buffer was allocated using global memory operations. At this
point the temporary buffer and temporary string storage all come from
the evaluation stack (that can be partially allocated on heap...), so
the extra logic isn't relevant for performance.
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In compact mode, we currently can not support zero-allocation moves
since some pointer assignments required during the move need to allocate
hash table slots.
This is mostly applicable to xml_document_struct::first_child, since the
pointer to this element is used as a hash table key, but there are some
contrived cases where parents of root's children need a hash slot and
didn't have it before.
These cases can be fixed by changing the compact encoding to be a bit
more move friendly, but for now it's easier to handle the error and
throw/return during move.
When this happens, the source document doesn't change.
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This allows us to do a single reserve for a known amount of assignments
that is larger than the default minimum per reserve (16).
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After move some nodes in the hash table can have keys that point to
other; this makes the table somewhat larger but this does not impact
correctness.
The reason is that for us to access a key in the hash table, there
should be a compact_pointer/string object with the state indicating that
it is stored in a hash table, and with the address matching the key. For
this to happen, we had to have put this object into this state which
would mean that we'd overwrite the hash entry with the new, correct
value.
When nodes/pages are being removed, we do not clean up keys from the
hash table - it's safe for the same reason, and thus move doesn't
introduce additional contracts here.
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This change implements the initial version of move construction and
assignment support for documents.
When moving a document to another document, we always make sure move
target is in "clean" state (empty document), and proceed by relocating
all structures in the most efficient way possible.
Complications arise from the fact that the root (document) node is
embedded into xml_document object, so all pointers to it have to change;
this includes parent pointers of all first-level children as well as
allocator pointers in all memory pages and previous pointer in the first
on-heap memory page.
Additionally, compact mode makes everything even more complicated
because some of the pointers we need to update are stored in the hash
table (in fact, document first_child pointer is very likely to be there;
some parent pointers in first-level children will be using
compact_shared_parent but some won't be) which requires allocating a new
hash table which can fail.
Some details of this process are not fully fleshed out, especially for
compact mode; and this definitely requires many tests.
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Clang/C2 does not implement __builtin_expect; additionally we need to
work around deprecation warnings for fopen by disabling them.
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It's not clear whether we still need PUGI__MSVC_CRT_VERSION, but it's
more consistent for now to use it for _snprintf_s since this is relying
on a CRT extension, not on a compiler feature.
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The macro only works correctly when the input argument is an array with
a statically known size - pointers or arrays decayed to pointers won't
work silently.
While this is unlikely to surface issues that aren't caught in
tests/code review, use _countof for MSVC to prevent such code from
compiling.
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Rename partition to partition3 to resolve conflicts with std::partition.
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Instead of branching code at each invocation site, use variadic macros
to create a wrapping macro that use snprintf for the buffer of a
statically known size.
Variadic macros are supported by all C++11 compilers, as is snprintf;
on MSVC 2005+ we don't necessarily have snprintf, but we can use
_snprintf_s with _TRUNCATE to get the same behavior. In all other cases
we fall back to sprintf, that (theoretically) can lead to a stack buffer
overflow.
In practice all snprintfs used in pugixml use buffers that should be
large enough to never be overflown but snprintf is safe even if this is
not the case.
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We use references to arrays elsewhere in the codebase and there's just
one caller for this function so it's easier to fix the size.
This will simplify snprintf refactoring.
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use snprintf instead of sprintf
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Now we can exclude these from code coverage since it's logically
impossible to hit them in tests.
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Integer sanitizer is flagging unsigned integer overflow in several
functions in pugixml; unsigned integer overflow is well defined but it
may not necessarily be intended.
Apart from hash functions, both string_to_integer and integer_to_string
use unsigned overflow - string_to_integer uses it to perform
two-complement negation so that the bulk of the operation can run using
unsigned integers. This makes it possible to simplify overflow checking.
Similarly integer_to_string negates the number before generating a
decimal representation, but negating is impossible without unsigned
overflow or special-casing certain integer limits.
For now just silence the integer overflow using a special attribute;
also move unsigned overflow into string_to_integer from get_value_* so
that we have fewer functions marked with the attribute.
Fixes #133.
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This reverts commit 79109a8546f963d17522d75112cffcfd8cbe35fc.
This warning does not happen on gcc-4.8.4; the workaround introduces an
unsigned integer overflow which results in a runtime error when compiled
with integer sanitizer.
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This is accomplished by putting a // fallthrough
comment at the right place.
This seems to be more portable than an attribute-based
solution like [[fallthrough]] or __attribute__((fallthrough)).
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Instead of a separate implementation for find/insert, use just one that
can do both. This reduces the code size and simplifies code coverage;
the resulting code is close to what we had in terms of performance and
since hash table is a fall back should not affect any real workloads.
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This will make sure we don't forget to implement offset_debug for new
node types if they ever happen (really it's mostly for consistency).
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Instead of a complicated partitioning scheme that tries to maintain the
equal area in the middle, use a scheme where we keep the equal area in
the left part of the array and then move it to the middle.
Since generally sorted arrays don't contain many duplicates this extra
copy is not too expensive, and it significantly simplifies the logic and
maintains good complexity for sorting arrays with many equal elements
nonetheless (unlike Hoare partitioning).
Instead of a median of 9 just use a median of 3 - it performs pretty
much identically on some internal performance tests, despite having a
bit more comparisons in some cases.
Finally, change the insertion sort threshold to 16 elements since that
appears to have slightly better performance.
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The previous implementation opted for doing two comparisons per element
in the sorted case in order to remove one iterator bounds check per
moved element when we actually need to copy. In our case however the
comparator is pretty expensive (except for remove_duplicates which is
fast as it is) so an extra object comparison hurts much more than an
iterator comparison saves.
This makes sorting by document order up to 3% faster for random
sequences.
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Instead of delegating to a method that just forwards the call to
xpath_query call the relevant method directly.
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It adds one stack frame to string query evaluation and does not really
simplify the code.
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Instead of having two checks for out-of-memory when exceptions are
enabled, do just one and decide what to do based on whether we can
throw.
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Instead of relying on a specific string in the parse result, use
allocator error state to report the error and then convert it to a
string if necessary.
We currently have to manually trigger the OOM error in two places
because we use global allocator in rare cases; we don't really need to
do this so this will be cleaned up later.
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The code works fine regardless of the *j->name check, and omitting this
makes the code more symmetric between the "count" and "write" stage;
additionally this improves coverage - due to how strcpy_insitu works
it's not really possible to get an empty non-NULL name in the node.
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All other functions treat null pointer inputs as invalid; now this
function does as well.
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Now error handling in XPath implementation relies on explicit error
propagation and is converted to an appropriate result at the end.
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This generates some out-of-memory code paths that are not covered by
existing tests, which will need to be resolved later.
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Instead of rolling back the allocation and trying to allocate again,
explicitly handle inplace reallocate if possible, and allocate a new
block otherwise.
This is going to be important once we use reallocate_nothrow from a
non-throwing context.
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This requires explicit error handling for xpath_string::data calls.
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This allows us to gradually convert exception handling of out-of-memory
during evaluation to a non-throwing approach without changing the
observable behavior.
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