Property system optimizations
Profiling startup with the new effects code exposed some performance gotchas. The objective is to reduce allocation of std::string temporaries, especially when looking up node path names. Also, I changed some paths to initialize strings with strings instead of char *; this causes less allocation, at least with glibc. Also, eliminate the old version of find_node and its helper functions by writing the template version of find_node_aux to handle an explicit index parameter. Also, add const char[] as an internal property type This doesn't actually add a new type to the property system, but allows using character arrays as arguments to certain templates.
This commit is contained in:
Tim Moore
Tim Moore
parent
ecd0a53412
commit
b905f4b8aa
@ -19,6 +19,11 @@
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#include <stdio.h>
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#include <string.h>
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#include <boost/algorithm/string/find_iterator.hpp>
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#include <boost/algorithm/string/predicate.hpp>
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#include <boost/algorithm/string/classification.hpp>
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#include <boost/range.hpp>
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#include <simgear/math/SGMath.hxx>
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#if PROPS_STANDALONE
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@ -78,49 +83,36 @@ public:
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// Local path normalization code.
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////////////////////////////////////////////////////////////////////////
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/**
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* A component in a path.
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*/
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struct PathComponent
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{
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string name;
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int index;
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};
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/**
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* Parse the name for a path component.
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*
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* Name: [_a-zA-Z][-._a-zA-Z0-9]*
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*/
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static inline const string
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parse_name (const string &path, int &i)
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template<typename Range>
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inline Range
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parse_name (const Range &path)
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{
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string name = "";
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int max = path.size();
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typename Range::iterator i = path.begin();
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typename Range::iterator max = path.end();
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if (path[i] == '.') {
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if (*i == '.') {
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i++;
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if (i < max && path[i] == '.') {
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if (i != path.end() && *i == '.') {
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i++;
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name = "..";
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} else {
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name = ".";
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}
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if (i < max && path[i] != '/')
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throw string("illegal character after " + name);
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}
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else if (isalpha(path[i]) || path[i] == '_') {
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name += path[i];
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if (i != max && *i != '/')
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throw string("illegal character after . or ..");
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} else if (isalpha(*i) || *i == '_') {
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i++;
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// The rules inside a name are a little
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// less restrictive.
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while (i < max) {
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if (isalpha(path[i]) || isdigit(path[i]) || path[i] == '_' ||
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path[i] == '-' || path[i] == '.') {
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name += path[i];
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} else if (path[i] == '[' || path[i] == '/') {
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while (i != max) {
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if (isalpha(*i) || isdigit(*i) || *i == '_' ||
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*i == '-' || *i == '.') {
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// name += path[i];
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} else if (*i == '[' || *i == '/') {
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break;
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} else {
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throw string("name may contain only ._- and alphanumeric characters");
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@ -130,90 +122,24 @@ parse_name (const string &path, int &i)
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}
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else {
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if (name.size() == 0)
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if (path.begin() == i)
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throw string("name must begin with alpha or '_'");
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}
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return name;
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return Range(path.begin(), i);
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}
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/**
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* Parse the optional integer index for a path component.
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*
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* Index: "[" [0-9]+ "]"
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*/
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static inline int
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parse_index (const string &path, int &i)
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// Validate the name of a single node
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inline bool validateName(const string& name)
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{
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int index = 0;
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if (path[i] != '[')
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return 0;
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else
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i++;
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for (int max = path.size(); i < max; i++) {
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if (isdigit(path[i])) {
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index = (index * 10) + (path[i] - '0');
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} else if (path[i] == ']') {
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i++;
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return index;
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} else {
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break;
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}
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}
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throw string("unterminated index (looking for ']')");
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using namespace boost;
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if (name.empty())
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return false;
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if (!isalpha(name[0]) && name[0] != '_')
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return false;
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return all(make_iterator_range(name.begin(), name.end()),
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is_alnum() || is_any_of("_-."));
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}
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/**
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* Parse a single path component.
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*
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* Component: Name Index?
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*/
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static inline PathComponent
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parse_component (const string &path, int &i)
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{
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PathComponent component;
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component.name = parse_name(path, i);
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if (component.name[0] != '.')
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component.index = parse_index(path, i);
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else
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component.index = -1;
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return component;
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}
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/**
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* Parse a path into its components.
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*/
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static void
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parse_path (const string &path, vector<PathComponent> &components)
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{
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int pos = 0;
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int max = path.size();
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// Check for initial '/'
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if (path[pos] == '/') {
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PathComponent root;
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root.name = "";
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root.index = -1;
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components.push_back(root);
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pos++;
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while (pos < max && path[pos] == '/')
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pos++;
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}
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while (pos < max) {
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components.push_back(parse_component(path, pos));
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while (pos < max && path[pos] == '/')
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pos++;
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}
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}
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////////////////////////////////////////////////////////////////////////
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// Other static utility functions.
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@ -242,16 +168,18 @@ compare_strings (const char * s1, const char * s2)
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/**
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* Locate a child node by name and index.
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*/
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template<typename Itr>
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static int
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find_child (const char * name, int index, const PropertyList& nodes)
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find_child (Itr begin, Itr end, int index, const PropertyList& nodes)
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{
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int nNodes = nodes.size();
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boost::iterator_range<Itr> name(begin, end);
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for (int i = 0; i < nNodes; i++) {
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SGPropertyNode * node = nodes[i];
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// searching for a mathing index is a lot less time consuming than
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// comparing two strings so do that first.
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if (node->getIndex() == index && compare_strings(node->getName(), name))
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if (node->getIndex() == index && boost::equals(node->getName(), name))
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return i;
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}
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return -1;
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@ -277,55 +205,137 @@ find_last_child (const char * name, const PropertyList& nodes)
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return index;
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}
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/**
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* Locate another node, given a relative path.
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*/
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static SGPropertyNode *
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find_node (SGPropertyNode * current,
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const vector<PathComponent> &components,
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int position,
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bool create)
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template<typename Itr>
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inline SGPropertyNode*
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SGPropertyNode::getExistingChild (Itr begin, Itr end, int index, bool create)
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{
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int pos = find_child(begin, end, index, _children);
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if (pos >= 0) {
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return _children[pos];
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} else if (create) {
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SGPropertyNode_ptr node;
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pos = find_child(begin, end, index, _removedChildren);
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if (pos >= 0) {
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PropertyList::iterator it = _removedChildren.begin();
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it += pos;
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node = _removedChildren[pos];
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_removedChildren.erase(it);
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node->setAttribute(REMOVED, false);
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_children.push_back(node);
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fireChildAdded(node);
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return node;
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}
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}
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return 0;
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}
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template<typename Itr>
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SGPropertyNode *
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SGPropertyNode::getChildImpl (Itr begin, Itr end, int index, bool create)
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{
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SGPropertyNode* node = getExistingChild(begin, end, index, create);
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if (node) {
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return node;
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} else if (create) {
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node = new SGPropertyNode(begin, end, index, this);
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_children.push_back(node);
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fireChildAdded(node);
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return node;
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} else {
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return 0;
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}
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}
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template<typename SplitItr>
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SGPropertyNode*
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find_node_aux(SGPropertyNode * current, SplitItr& itr, bool create,
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int last_index)
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{
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typedef typename SplitItr::value_type Range;
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// Run off the end of the list
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if (current == 0) {
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return 0;
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}
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// Success! This is the one we want.
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else if (position >= (int)components.size()) {
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return (current->getAttribute(SGPropertyNode::REMOVED) ? 0 : current);
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}
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// Empty component means root.
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else if (components[position].name == "") {
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return find_node(current->getRootNode(), components, position + 1, create);
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}
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// . means current directory
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else if (components[position].name == ".") {
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return find_node(current, components, position + 1, create);
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}
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// .. means parent directory
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else if (components[position].name == "..") {
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if (itr.eof())
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return current;
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Range token = *itr;
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// Empty name at this point is empty, not root.
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if (token.empty())
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return find_node_aux(current, ++itr, create, last_index);
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Range name = parse_name(token);
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if (equals(name, "."))
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return find_node_aux(current, ++itr, create, last_index);
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if (equals(name, "..")) {
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SGPropertyNode * parent = current->getParent();
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if (parent == 0)
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throw string("attempt to move past root with '..'");
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else
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return find_node(parent, components, position + 1, create);
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return find_node_aux(parent, ++itr, create, last_index);
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}
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int index = -1;
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if (last_index >= 0) {
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// If we are at the last token and last_index is valid, use
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// last_index as the index value
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bool lastTok = true;
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while (!(++itr).eof()) {
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if (!itr->empty()) {
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lastTok = false;
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break;
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}
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}
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if (lastTok)
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index = last_index;
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} else {
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++itr;
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}
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// Otherwise, a child name
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else {
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SGPropertyNode * child =
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current->getChild(components[position].name.c_str(),
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components[position].index,
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create);
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return find_node(child, components, position + 1, create);
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if (index < 0) {
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index = 0;
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if (name.end() != token.end()) {
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if (*name.end() == '[') {
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typename Range::iterator i = name.end() + 1, end = token.end();
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for (;i != end; ++i) {
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if (isdigit(*i)) {
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index = (index * 10) + (*i - '0');
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} else {
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break;
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}
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}
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if (i == token.end() || *i != ']')
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throw string("unterminated index (looking for ']')");
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} else {
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throw string("illegal characters in token: ")
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+ string(name.begin(), name.end());
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}
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}
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}
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return find_node_aux(current->getChildImpl(name.begin(), name.end(),
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index, create), itr, create,
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last_index);
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}
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// Internal function for parsing property paths. last_index provides
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// and index value for the last node name token, if supplied.
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template<typename Range>
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SGPropertyNode*
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find_node (SGPropertyNode * current,
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const Range& path,
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bool create,
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int last_index = -1)
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{
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using namespace boost;
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typedef split_iterator<typename range_result_iterator<Range>::type>
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PathSplitIterator;
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PathSplitIterator itr
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= make_split_iterator(path, first_finder("/", is_equal()));
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if (*path.begin() == '/')
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return find_node_aux(current->getRootNode(), itr, create, last_index);
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else
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return find_node_aux(current, itr, create, last_index);
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}
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////////////////////////////////////////////////////////////////////////
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@ -695,10 +705,12 @@ SGPropertyNode::SGPropertyNode (const SGPropertyNode &node)
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/**
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* Convenience constructor.
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*/
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SGPropertyNode::SGPropertyNode (const char * name,
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template<typename Itr>
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SGPropertyNode::SGPropertyNode (Itr begin, Itr end,
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int index,
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SGPropertyNode * parent)
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: _index(index),
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_name(begin, end),
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_parent(parent),
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_path_cache(0),
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_type(props::NONE),
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@ -706,14 +718,29 @@ SGPropertyNode::SGPropertyNode (const char * name,
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_attr(READ|WRITE),
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_listeners(0)
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{
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int i = 0;
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_local_val.string_val = 0;
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_value.val = 0;
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_name = parse_name(name, i);
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if (i != int(strlen(name)) || name[0] == '.')
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throw string("plain name expected instead of '") + name + '\'';
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if (!validateName(_name))
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throw string("plain name expected instead of '") + _name + '\'';
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}
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SGPropertyNode::SGPropertyNode (const string& name,
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int index,
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SGPropertyNode * parent)
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: _index(index),
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_name(name),
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_parent(parent),
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_path_cache(0),
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_type(props::NONE),
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_tied(false),
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_attr(READ|WRITE),
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_listeners(0)
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{
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_local_val.string_val = 0;
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_value.val = 0;
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if (!validateName(name))
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throw string("plain name expected instead of '") + _name + '\'';
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}
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/**
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* Destructor.
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@ -801,7 +828,7 @@ SGPropertyNode::addChild (const char * name)
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int pos = find_last_child(name, _children)+1;
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SGPropertyNode_ptr node;
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node = new SGPropertyNode(name, pos, this);
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node = new SGPropertyNode(name, name + strlen(name), pos, this);
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_children.push_back(node);
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fireChildAdded(node);
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return node;
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@ -837,24 +864,23 @@ SGPropertyNode::getChild (int position) const
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/**
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* Get a non-const child by name and index, creating if necessary.
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*/
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SGPropertyNode *
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SGPropertyNode::getChild (const char * name, int index, bool create)
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{
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int pos = find_child(name, index, _children);
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if (pos >= 0) {
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return _children[pos];
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return getChildImpl(name, name + strlen(name), index, create);
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}
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SGPropertyNode *
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SGPropertyNode::SGPropertyNode::getChild (const string& name, int index,
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bool create)
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{
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SGPropertyNode* node = getExistingChild(name.begin(), name.end(), index,
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create);
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if (node) {
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return node;
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} else if (create) {
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SGPropertyNode_ptr node;
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pos = find_child(name, index, _removedChildren);
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if (pos >= 0) {
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PropertyList::iterator it = _removedChildren.begin();
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it += pos;
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node = _removedChildren[pos];
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_removedChildren.erase(it);
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node->setAttribute(REMOVED, false);
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} else {
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node = new SGPropertyNode(name, index, this);
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}
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_children.push_back(node);
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fireChildAdded(node);
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return node;
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@ -863,14 +889,13 @@ SGPropertyNode::getChild (const char * name, int index, bool create)
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}
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}
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/**
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* Get a const child by name and index.
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*/
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const SGPropertyNode *
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SGPropertyNode::getChild (const char * name, int index) const
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{
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int pos = find_child(name, index, _children);
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int pos = find_child(name, name + strlen(name), index, _children);
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if (pos >= 0)
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return _children[pos];
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else
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@ -945,7 +970,7 @@ SGPropertyNode_ptr
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SGPropertyNode::removeChild (const char * name, int index, bool keep)
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{
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SGPropertyNode_ptr ret;
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int pos = find_child(name, index, _children);
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int pos = find_child(name, name + strlen(name), index, _children);
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if (pos >= 0)
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ret = removeChild(pos, keep);
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return ret;
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@ -1710,14 +1735,16 @@ SGPropertyNode::getRootNode () const
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SGPropertyNode *
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SGPropertyNode::getNode (const char * relative_path, bool create)
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{
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using namespace boost;
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if (_path_cache == 0)
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_path_cache = new hash_table;
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SGPropertyNode * result = _path_cache->get(relative_path);
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if (result == 0) {
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vector<PathComponent> components;
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parse_path(relative_path, components);
|
||||
result = find_node(this, components, 0, create);
|
||||
result = find_node(this,
|
||||
make_iterator_range(relative_path, relative_path
|
||||
+ strlen(relative_path)),
|
||||
create);
|
||||
if (result != 0)
|
||||
_path_cache->put(relative_path, result);
|
||||
}
|
||||
@ -1728,11 +1755,10 @@ SGPropertyNode::getNode (const char * relative_path, bool create)
|
||||
SGPropertyNode *
|
||||
SGPropertyNode::getNode (const char * relative_path, int index, bool create)
|
||||
{
|
||||
vector<PathComponent> components;
|
||||
parse_path(relative_path, components);
|
||||
if (components.size() > 0)
|
||||
components.back().index = index;
|
||||
return find_node(this, components, 0, create);
|
||||
using namespace boost;
|
||||
return find_node(this, make_iterator_range(relative_path, relative_path
|
||||
+ strlen(relative_path)),
|
||||
create, index);
|
||||
}
|
||||
|
||||
const SGPropertyNode *
|
||||
|
||||
@ -161,6 +161,7 @@ DEFINTERNALPROP(long, LONG);
|
||||
DEFINTERNALPROP(float, FLOAT);
|
||||
DEFINTERNALPROP(double, DOUBLE);
|
||||
DEFINTERNALPROP(const char *, STRING);
|
||||
DEFINTERNALPROP(const char[], STRING);
|
||||
#undef DEFINTERNALPROP
|
||||
|
||||
template<>
|
||||
@ -804,6 +805,11 @@ public:
|
||||
*/
|
||||
const char * getName () const { return _name.c_str(); }
|
||||
|
||||
/**
|
||||
* Get the node's simple name as a string.
|
||||
*/
|
||||
const std::string& getNameString () const { return _name; }
|
||||
|
||||
/**
|
||||
* Get the node's pretty display name, with subscript when needed.
|
||||
*/
|
||||
@ -875,17 +881,10 @@ public:
|
||||
/**
|
||||
* Get a child node by name and index.
|
||||
*/
|
||||
SGPropertyNode * getChild (const char * name, int index = 0,
|
||||
SGPropertyNode * getChild (const char* name, int index = 0,
|
||||
bool create = false);
|
||||
|
||||
/**
|
||||
* Get a child node by name and index.
|
||||
*/
|
||||
SGPropertyNode * getChild (const std::string& name, int index = 0,
|
||||
bool create = false)
|
||||
{ return getChild(name.c_str(), index, create); }
|
||||
|
||||
|
||||
bool create = false);
|
||||
/**
|
||||
* Get a const child node by name and index.
|
||||
*/
|
||||
@ -1224,6 +1223,12 @@ public:
|
||||
typename boost::disable_if_c<simgear::props::PropertyTraits<T>::Internal>
|
||||
::type* dummy = 0);
|
||||
|
||||
template<int N>
|
||||
bool setValue(const char (&val)[N])
|
||||
{
|
||||
return setValue(&val[0]);
|
||||
}
|
||||
|
||||
/**
|
||||
* Print the value of the property to a stream.
|
||||
*/
|
||||
@ -1604,8 +1609,9 @@ protected:
|
||||
/**
|
||||
* Protected constructor for making new nodes on demand.
|
||||
*/
|
||||
SGPropertyNode (const char * name, int index, SGPropertyNode * parent);
|
||||
|
||||
SGPropertyNode (const std::string& name, int index, SGPropertyNode * parent);
|
||||
template<typename Itr>
|
||||
SGPropertyNode (Itr begin, Itr end, int index, SGPropertyNode * parent);
|
||||
|
||||
private:
|
||||
|
||||
@ -1743,7 +1749,16 @@ private:
|
||||
unsigned int _data_length;
|
||||
bucket ** _data;
|
||||
};
|
||||
|
||||
// Pass name as a pair of iterators
|
||||
template<typename Itr>
|
||||
SGPropertyNode * getChildImpl (Itr begin, Itr end, int index = 0, bool create = false);
|
||||
// very internal method
|
||||
template<typename Itr>
|
||||
SGPropertyNode* getExistingChild (Itr begin, Itr end, int index, bool create);
|
||||
// very internal path parsing function
|
||||
template<typename SplitItr>
|
||||
friend SGPropertyNode* find_node_aux(SGPropertyNode * current, SplitItr& itr,
|
||||
bool create, int last_index);
|
||||
};
|
||||
|
||||
// Convenience functions for use in templates
|
||||
|
||||
@ -187,16 +187,17 @@ PropsVisitor::startElement (const char * name, const XMLAttributes &atts)
|
||||
// Get the index.
|
||||
attval = atts.getValue("n");
|
||||
int index = 0;
|
||||
string strName(name);
|
||||
if (attval != 0) {
|
||||
index = atoi(attval);
|
||||
st.counters[name] = SG_MAX2(st.counters[name], index+1);
|
||||
st.counters[strName] = SG_MAX2(st.counters[strName], index+1);
|
||||
} else {
|
||||
index = st.counters[name];
|
||||
st.counters[name]++;
|
||||
index = st.counters[strName];
|
||||
st.counters[strName]++;
|
||||
}
|
||||
|
||||
// Got the index, so grab the node.
|
||||
SGPropertyNode * node = st.node->getChild(name, index, true);
|
||||
SGPropertyNode * node = st.node->getChild(strName, index, true);
|
||||
if (!node->getAttribute(SGPropertyNode::WRITE)) {
|
||||
SG_LOG(SG_INPUT, SG_ALERT, "Not overwriting write-protected property "
|
||||
<< node->getPath(true));
|
||||
@ -678,7 +679,7 @@ copyProperties (const SGPropertyNode *in, SGPropertyNode *out)
|
||||
int nChildren = in->nChildren();
|
||||
for (int i = 0; i < nChildren; i++) {
|
||||
const SGPropertyNode * in_child = in->getChild(i);
|
||||
SGPropertyNode * out_child = out->getChild(in_child->getName(),
|
||||
SGPropertyNode * out_child = out->getChild(in_child->getNameString(),
|
||||
in_child->getIndex(),
|
||||
true);
|
||||
if (!copyProperties(in_child, out_child))
|
||||
|
||||
Loading…
Reference in New Issue
Block a user