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2014-11-07Merge branch 'master' into compactArseny Kapoulkine
2014-11-07XPath: Partially inline xpath_node_set_raw::push_backArseny Kapoulkine
Previously push_back implementation was too big to inline; now the common case (no realloc) is small and realloc variant is explicitly marked as no-inline. This is similar to xml_allocator::allocate_memory/allocate_memory_oob and makes some XPath queries 5% faster.
2014-11-07XPath: Only call apply_predicates if necessaryArseny Kapoulkine
In some cases constant overhead on step evaluation is important - i.e. for queries that evaluate a simple step in a predicate expression. Eliminating a redundant function call thus can prove worthwhile. This change makes some queries (e.g. //*[not(*)]) 4% faster.
2014-11-06Fix compact mode compilationArseny Kapoulkine
Clang and gcc seem to treat string literals differently...
2014-11-06Verify that compact page encoding is safeArseny Kapoulkine
Since page size can be customized let's do a special validation check for compact encoding. Right now it's redundant since page size is limited by 64k in alloc_string, but that may change in the future.
2014-11-06Add a separate storage class for PI nodesArseny Kapoulkine
This allows us to add pi value to restore target support for PI nodes without increasing the memory usage for other nodes. Right now the PI node has a separate header that's used for allocated bit; this allows us to reduce header bitcount in the future.
2014-11-05Ensure selected page size works with allocate_stringArseny Kapoulkine
Previously setting a large page size (i.e. 1M) would cause dynamic string allocation to assert spuriously. A page size of 64K guarantees that all offsets fit into 16 bits.
2014-11-05Fix xml_node::offset_debug for corner casesArseny Kapoulkine
Computed offsets for documents with nodes that were added using append_buffer or newly appended nodes without name/value information were invalid.
2014-11-05Use impl::get_document instead of root() where possibleArseny Kapoulkine
This reduces the number of unsafe pointer manipulations.
2014-11-05Remove redundant branchesArseny Kapoulkine
These used to result in better codegen for unknown reasons, but this is no longer the case.
2014-11-04Fix gcc warnings in compact modeArseny Kapoulkine
2014-11-04Merge branch 'master' into compactArseny Kapoulkine
2014-11-03XPath: Refactor predicate applicationArseny Kapoulkine
Split number/boolean filtering logic into two functions. This creates an extra copy of a remove_if-like algorithm, but moves the type check out of the loop and results in better organized filtering code. Consolidate test-based dispatch into apply_predicate (which is now a member function).
2014-11-02Fix undefined behavior while calling memcpyArseny Kapoulkine
Calling memcpy(x, 0, 0) is technically undefined (although it should usually be a no-op).
2014-11-01XPath: Fix undefined behavior while calling memcpyArseny Kapoulkine
Calling memcpy(x, 0, 0) is technically undefined (although it should usually be a no-op). Fixes #20.
2014-10-28Fix compilation after merge.Arseny Kapoulkine
2014-10-28Merge branch 'master' into compactArseny Kapoulkine
2014-10-28Fix several cppcheck warnings.Arseny Kapoulkine
2014-10-27Optimize node printing by using raw pointersArseny Kapoulkine
This lets us do fewer null pointer checks (making printing 2% faster with -O3) and removes a lot of function calls (making printing 20% faster with -O0).
2014-10-27XPath: Optimize [position()=expr] and [last()]Arseny Kapoulkine
To get more benefits from constant predicate/filter optimization we rewrite [position()=expr] predicates into [expr] for numeric expressions. Right now the rewrite is only for entire expressions - it may be beneficial to split complex expressions like [position()=constant and expr] into [constant][expr] but that is more complicated. last() does not depend on the node set contents so is "constant" as far as our optimization is concerned so we can evaluate it once.
2014-10-26XPath: Only recognize numeric constant expressionsArseny Kapoulkine
Numeric and boolean constant expressions in filters are different in that to evaluate numeric expressions we need a sorted order, but to evaluate boolean expressions we don't. The previously implemented optimization adds an extra sorting step for constant boolean filters that will be more expensive than redundant computations. Since constant booleans are sort of an edge case, don't do this optimization. This allows us to simplify apply_predicate_const to only handle numbers.
2014-10-26XPath: Unify ast_filter/ast_predicate structureArseny Kapoulkine
Now expression is always _right for filter/predicate nodes to make optimize() simpler. Additionally we now use predicate metadata to make is_posinv_step() faster. This introduces a weak ordering dependency in rewrite rules to optimize() - classification has to be performed before other optimizations.
2014-10-26XPath: Optimize constant filters/predicatesArseny Kapoulkine
If a filter/predicate expression is a constant, we don't need to evaluate it for every nodeset element - we can evaluate it once and pick the right element or keep/discard the entire collection. If the expression is 1, we can early out on first node when evaluating the node set - queries like following::item[1] are now significantly faster. Additionally this change refactors filters/predicates to have additional metadata describing the expression type in _test field that is filled during optimization. Note that predicate_constant selection right now is very simple (but captures most common use cases except for maybe [last()]).
2014-10-25Fix node copying for some out of memory casesArseny Kapoulkine
A page can fail to allocate during attribute creation; this case was not previously handled. git-svn-id: https://pugixml.googlecode.com/svn/trunk@1080 99668b35-9821-0410-8761-19e4c4f06640
2014-10-25Remove redundant null pointer checks.Arseny Kapoulkine
When removing a node or attribute, we know that the parent has at least one node/attribute so a null pointer check is redundant. git-svn-id: https://pugixml.googlecode.com/svn/trunk@1078 99668b35-9821-0410-8761-19e4c4f06640
2014-10-21Fix compact modeArseny Kapoulkine
2014-10-21Merge branch 'master' into compactArseny Kapoulkine
2014-10-22XPath: Optimize predicate evaluationArseny Kapoulkine
If the requested evaluation mode is not _all, we can use this mode for the last predicate/filter expression and exit early. git-svn-id: https://pugixml.googlecode.com/svn/trunk@1073 99668b35-9821-0410-8761-19e4c4f06640
2014-10-22XPath: Use node pointers in step_push/step_fillArseny Kapoulkine
Using pointers instead of node/attribute objects allows us to use knowledge about the tree to guarantee that pointers are not null. This results in less null checks (10-20% speedup with optimizations enabled) and less function calls (5x speedup with optimizations disabled). git-svn-id: https://pugixml.googlecode.com/svn/trunk@1072 99668b35-9821-0410-8761-19e4c4f06640
2014-10-20Merge branch 'master' into compactArseny Kapoulkine
2014-10-21XPath: Make sure step_push is called with valid nodesArseny Kapoulkine
Some steps relied on step_push rejecting null inputs; this is no longer the case. Additionally stepping now more rigorously filters null inputs. git-svn-id: https://pugixml.googlecode.com/svn/trunk@1069 99668b35-9821-0410-8761-19e4c4f06640
2014-10-20XPath: Introduce _first/_any set evaluation modesArseny Kapoulkine
Sometimes when evaluating the node set we don't need the entire set and only need the first element in docorder or any element. In the absence of iterator support we can still use this information to short-circuit traversals. This does not have any effect on straightforward node collection queries, but frequently improves performance of complex queries with predicates etc. XMark benchmark gets 15x faster with some queries enjoying 100x speedup on 10 Mb dataset due to a significant complexity improvement. git-svn-id: https://pugixml.googlecode.com/svn/trunk@1067 99668b35-9821-0410-8761-19e4c4f06640
2014-10-19XPath: Rename xml_node::select_single_node to ::select_nodeArseny Kapoulkine
select_node is shorter and mistyping nodes as node or vice versa should not lead to any issues since return types are substantially different. select_single_node method still works and will be deprecated with an attribute and removed at some point. git-svn-id: https://pugixml.googlecode.com/svn/trunk@1065 99668b35-9821-0410-8761-19e4c4f06640
2014-10-19XPath: Introduce xpath_query::evaluate_nodeArseny Kapoulkine
This method is equivalent to xml_node::select_single_node. This makes select_single_node faster in certain cases by avoiding an allocation and - more importantly - paves the way for future step optimizations. git-svn-id: https://pugixml.googlecode.com/svn/trunk@1064 99668b35-9821-0410-8761-19e4c4f06640
2014-10-18XPath: Extend the descendant-or-self optimizationArseny Kapoulkine
Use descendant-or-self::node() transformation for self, descendant and descendant-or-self axis. Self axis should be semi-frequent; descendant axes should not really be used with // but if they ever are the complexity of the step becomes quadratic so it's better to optimize this if possible. git-svn-id: https://pugixml.googlecode.com/svn/trunk@1063 99668b35-9821-0410-8761-19e4c4f06640
2014-10-16XPath: Optimize attribute axis lookupArseny Kapoulkine
When looking for an attribute by name, finding the first attribute means we can stop looking since attribute names are unique. This makes some queries faster by 40%. Another very common pattern in XPath queries is finding an attribute with a specified value using a predicate (@name = 'value'). While we perform an optimal amount of traversal in that case, there is a substantial overhead with evaluating the nodes, saving and restoring the stack state, pushing the attribute node into a set, etc. Detecting this pattern allows us to use optimized code, resulting in up to 2x speedup for some queries. git-svn-id: https://pugixml.googlecode.com/svn/trunk@1061 99668b35-9821-0410-8761-19e4c4f06640
2014-10-15XPath: Fix optimization bug with //name[last()]Arseny Kapoulkine
The actual condition for the optimization is invariance from context list -- this includes both position() and last(). Instead of splitting the posinv concept just include last() into non-posinv expressions - this requires sorting for boolean predicates that depend on last() and do not depend on position(). These cases should be very rare. git-svn-id: https://pugixml.googlecode.com/svn/trunk@1060 99668b35-9821-0410-8761-19e4c4f06640
2014-10-14Adjust comment output to avoid malformed documents.Arseny Kapoulkine
Comment value can not contain the string "--" or end with "-". Since comments do not support escaping, we're handling this by adding an extra space after the first "-". A string of "-" thus turns into "- - - ...". git-svn-id: https://pugixml.googlecode.com/svn/trunk@1058 99668b35-9821-0410-8761-19e4c4f06640
2014-10-11Fix compact mode for 64-bit architecturesArseny Kapoulkine
2014-10-11Compact implementation refactoringArseny Kapoulkine
Remove compact stats and tags, replace pointer hash with murmur3 32-bit finalizer.
2014-10-10Merge branch 'master' into compactArseny Kapoulkine
2014-10-11Swap insert_attribute_* implementationsArseny Kapoulkine
Make sure their order is consistent with the order of declaration in header file. git-svn-id: https://pugixml.googlecode.com/svn/trunk@1057 99668b35-9821-0410-8761-19e4c4f06640
2014-10-10Split hash table operations into reserve and insertArseny Kapoulkine
Insert is now unsafe - since we don't have a way to handle rehash() failures transparently we need to reserve space beforehand. Reserve is now called before every tree-mutating operations and it guarantees that we can perform 16 arbitrary pointer mutations after that. This fixes all test crashes with compact mode.
2014-10-10Move compact_hash_table before xml_allocator.Arseny Kapoulkine
This helps streamline class dependencies and will make subsequent changes smaller.
2014-10-10Merge branch 'master' into compactArseny Kapoulkine
2014-10-11Refactor node/attribute tree operationsArseny Kapoulkine
All ad-hoc attribute operations are now implemented as explicit low-level functions, and xml_node just uses them. Additionally extract commonly used is_attribute_of and move detaching of node from append_node to remove_node - append_node now only works on detached nodes (small increase in parsing performance). git-svn-id: https://pugixml.googlecode.com/svn/trunk@1056 99668b35-9821-0410-8761-19e4c4f06640
2014-10-10Fix Borland C++ compilation errors/warningsArseny Kapoulkine
git-svn-id: https://pugixml.googlecode.com/svn/trunk@1055 99668b35-9821-0410-8761-19e4c4f06640
2014-10-09Change compact_pointer_parent to use 2 bytesArseny Kapoulkine
Parent pointers need to be able to reach everywhere within a page to minimize shared parent pointer reuse unless it's absolutely necessary. This reduces parent hash utilization on all test cases to <1%. Rename compact_parent to compact_shared_parent.
2014-10-08Optimize compact_pointer_parentArseny Kapoulkine
We now no longer need the compact_alignment type so replace it with a constant.
2014-10-07Rework compact_pointer implementationArseny Kapoulkine
Split the implementation into a generic one with adjustable range and a special implementation for parent (may need to use 2 bytes on that one later). Optimize compact_string and compact_pointer to use minimal amount of math and move slow hash paths into no-inline functions so that compiler can inline the fast-paths. Merge compact_pointer_generic and compact_pointer_forward and optimize.