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< ul class = "crumbs" > < li > < a href = "../index.html" > Home< / a > < / li > < li > < a href = "../services.html" > Services< / a > < / li > < li > < a href = "index.html" > syntax< / a > < / li > < li > < a href = "index.html#2" > Chapter 2: The Parse Tree< / a > < / li > < li > < b > Tree Verification< / b > < / li > < / ul > < / div >
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< p class = "purpose" > Did we go wrong anywhere? This section is purely defensive, and tests whether Inform contains bugs of a kind which lead to malformed syntax trees: that should never happen even if the source text being compiled is a dumpster fire.< / p >
< ul class = "toc" > < li > < a href = "2-tv.html#SP1" > § 1. Verify integrity< / a > < / li > < li > < a href = "2-tv.html#SP3" > § 3. Verify structure< / a > < / li > < / ul > < hr class = "tocbar" >
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< p class = "commentary firstcommentary" > < a id = "SP1" class = "paragraph-anchor" > < / a > < b > § 1. Verify integrity. < / b > We can perform two different checks.
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< / p >
< p class = "commentary" > The first duty of a tree is to contain no loops, and the following checks
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that (rejecting even undirected loops). In addition, it checks that each
node has an enumerated node type, rather than a meaning code.
< / p >
< pre class = "displayed-code all-displayed-code code-font" >
< span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > tree_stats_size< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > tree_stats_depth< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > tree_stats_width< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > ;< / span >
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< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > VerifyTree::verify_integrity< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > parse_node_tree< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > T< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > tree_stats_size< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > ; < / span > < span class = "identifier-syntax" > tree_stats_depth< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > ; < / span > < span class = "identifier-syntax" > tree_stats_width< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > 1< / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-tv.html#SP1" class = "function-link" > < span class = "function-syntax" > VerifyTree::verify_integrity_below< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > T< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > root_node< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > }< / span >
< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > VerifyTree::verify_integrity_below< / span > < button class = "popup" onclick = "togglePopup('usagePopup1')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup1" > Usage of < span class = "code-font" > < span class = "function-syntax" > VerifyTree::verify_integrity_below< / span > < / span > :< br / > < a href = "2-tv.html#SP3" > § 3< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > parse_node< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < a href = "2-tv.html#SP2" class = "function-link" > < span class = "function-syntax" > VerifyTree::verify_integrity_r< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > down< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > "down"< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > ,< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-st.html#SP19" class = "function-link" > < span class = "function-syntax" > SyntaxTree::new_traverse_token< / span > < / a > < span class = "plain-syntax" > ());< / span >
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< span class = "plain-syntax" > }< / span >
< / pre >
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< p class = "commentary firstcommentary" > < a id = "SP2" class = "paragraph-anchor" > < / a > < b > § 2. < / b > The verification traverse is a very cautious manoeuvre: we step through
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the tree, testing each branch with our outstretched foot. At the first sign
of trouble we panic.
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< / p >
< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > VerifyTree::verify_integrity_r< / span > < button class = "popup" onclick = "togglePopup('usagePopup2')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup2" > Usage of < span class = "code-font" > < span class = "function-syntax" > VerifyTree::verify_integrity_r< / span > < / span > :< br / > < a href = "2-tv.html#SP1" > § 1< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > parse_node< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > ,< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > parse_node< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > from< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > char< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > way< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > depth< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > traverse_token< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > for< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > width< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > ; < / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > ; < / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > next< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > width< / span > < span class = "plain-syntax" > ++) {< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > last_seen_on_traverse< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > traverse_token< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LOG< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "Cycle found in parse tree, found %s from:\n$P"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > way< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > from< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Errors::set_internal_handler< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "Cycle found in parse tree"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > }< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > last_seen_on_traverse< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > traverse_token< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "constant-syntax" > node_type_t< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > t< / span > < span class = "plain-syntax" > = < / span > < a href = "2-pn.html#SP5" class = "function-link" > < span class = "function-syntax" > Node::get_type< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < a href = "2-nt.html#SP2" class = "function-link" > < span class = "function-syntax" > NodeType::is_enumerated< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > t< / span > < span class = "plain-syntax" > )) < / span > < span class = "identifier-syntax" > tree_stats_size< / span > < span class = "plain-syntax" > ++;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > else< / span > < span class = "plain-syntax" > {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LOG< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "Invalid node type (%08x) found %s from:\n$P"< / span > < span class = "plain-syntax" > , (< / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > t< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > way< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > from< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Errors::set_internal_handler< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "Link broken in parse tree"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > next_alternative< / span > < span class = "plain-syntax" > )< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-tv.html#SP2" class = "function-link" > < span class = "function-syntax" > VerifyTree::verify_integrity_r< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > next_alternative< / span > < span class = "plain-syntax" > ,< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > "alt"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > depth< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > traverse_token< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > down< / span > < span class = "plain-syntax" > )< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-tv.html#SP2" class = "function-link" > < span class = "function-syntax" > VerifyTree::verify_integrity_r< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > down< / span > < span class = "plain-syntax" > ,< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > "down"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > depth< / span > < span class = "plain-syntax" > +1, < / span > < span class = "identifier-syntax" > traverse_token< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > width< / span > < span class = "plain-syntax" > > < / span > < span class = "identifier-syntax" > tree_stats_width< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > tree_stats_width< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > width< / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > }< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > depth< / span > < span class = "plain-syntax" > > < / span > < span class = "identifier-syntax" > tree_stats_depth< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > tree_stats_depth< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > depth< / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > }< / span >
< / pre >
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< p class = "commentary firstcommentary" > < a id = "SP3" class = "paragraph-anchor" > < / a > < b > § 3. Verify structure. < / b > The parse tree is a complicated structure, arbitrarily wide and deep, and
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containing many different node types, each subject to its own rules of usage.
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In this second check, we ensure that nodes have acceptable parentage and
annotations — that is, parentage and annotations which fall within the
permissions set up when their node types were created.
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< / p >
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< p class = "commentary" > If any test fails, Inform will stop with an internal error. (If there are
multiple failures, we itemise them to the debugging log, and only produce
a single internal error at the end.)
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< / p >
< p class = "commentary" > We protect ourselves by first checking that the tree is intact as a
structure: once we know the tree is safe to climb over, we can wander
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about counting branches with impunity.
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< / p >
< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > VerifyTree::verify_structure< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > parse_node_tree< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > T< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > T< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > root_node< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Errors::set_internal_handler< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "Root of parse tree NULL"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > }< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-tv.html#SP3" class = "function-link" > < span class = "function-syntax" > VerifyTree::verify_structure_from< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > T< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > root_node< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > }< / span >
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< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > VerifyTree::verify_structure_from< / span > < button class = "popup" onclick = "togglePopup('usagePopup3')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup3" > Usage of < span class = "code-font" > < span class = "function-syntax" > VerifyTree::verify_structure_from< / span > < / span > :< br / > Simple Preform Cache - < a href = "2-spc.html#SP2" > § 2< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > parse_node< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-tv.html#SP1" class = "function-link" > < span class = "function-syntax" > VerifyTree::verify_integrity_below< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > errors_found< / span > < span class = "plain-syntax" > = < / span > < a href = "2-tv.html#SP4" class = "function-link" > < span class = "function-syntax" > VerifyTree::verify_structure_r< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > errors_found< / span > < span class = "plain-syntax" > > < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LOG< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "[Verification failed: %d node errors]\n"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > errors_found< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Errors::set_internal_handler< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "Parse tree broken"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > }< / span >
< / pre >
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< p class = "commentary firstcommentary" > < a id = "SP4" class = "paragraph-anchor" > < / a > < b > § 4. < / b > Note that on every call to the following routine, (i) < span class = "extract" > < span class = "extract-syntax" > p< / span > < / span > is a valid
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parse node and (ii) either < span class = "extract" > < span class = "extract-syntax" > p< / span > < / span > is the tree root, in which case < span class = "extract" > < span class = "extract-syntax" > parent< / span > < / span > is
< span class = "extract" > < span class = "extract-syntax" > NULL< / span > < / span > , or < span class = "extract" > < span class = "extract-syntax" > parent< / span > < / span > is the unique node having < span class = "extract" > < span class = "extract-syntax" > p< / span > < / span > (or an alternative to < span class = "extract" > < span class = "extract-syntax" > p< / span > < / span > )
among its children.
< / p >
< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > VerifyTree::verify_structure_r< / span > < button class = "popup" onclick = "togglePopup('usagePopup4')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup4" > Usage of < span class = "code-font" > < span class = "function-syntax" > VerifyTree::verify_structure_r< / span > < / span > :< br / > < a href = "2-tv.html#SP3" > § 3< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > parse_node< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > parse_node< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > parent< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > ec< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "constant-syntax" > node_type_t< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > t< / span > < span class = "plain-syntax" > = < / span > < a href = "2-pn.html#SP5" class = "function-link" > < span class = "function-syntax" > Node::get_type< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > node_type_metadata< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > metadata< / span > < span class = "plain-syntax" > = < / span > < a href = "2-nt.html#SP7" class = "function-link" > < span class = "function-syntax" > NodeType::get_metadata< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > t< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > metadata< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "broken tree should have been reported"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "2-tv.html#SP4_1" class = "named-paragraph-link" > < span class = "named-paragraph" > Check rule (1) of the invariant< / span > < span class = "named-paragraph-number" > 4.1< / span > < / a > < / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "2-tv.html#SP4_2" class = "named-paragraph-link" > < span class = "named-paragraph" > Check rule (2) of the invariant< / span > < span class = "named-paragraph-number" > 4.2< / span > < / a > < / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > parent< / span > < span class = "plain-syntax" > ) < / span > < span class = "named-paragraph-container code-font" > < a href = "2-tv.html#SP4_3" class = "named-paragraph-link" > < span class = "named-paragraph" > Check rule (3) of the invariant< / span > < span class = "named-paragraph-number" > 4.3< / span > < / a > < / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > children_count< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > for< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > parse_node< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > q< / span > < span class = "plain-syntax" > =< / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > down< / span > < span class = "plain-syntax" > ; < / span > < span class = "identifier-syntax" > q< / span > < span class = "plain-syntax" > ; < / span > < span class = "identifier-syntax" > q< / span > < span class = "plain-syntax" > =< / span > < span class = "identifier-syntax" > q< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > next< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > children_count< / span > < span class = "plain-syntax" > ++)< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > ec< / span > < span class = "plain-syntax" > += < / span > < a href = "2-tv.html#SP4" class = "function-link" > < span class = "function-syntax" > VerifyTree::verify_structure_r< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > q< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > ec< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "2-tv.html#SP4_4" class = "named-paragraph-link" > < span class = "named-paragraph" > Check rule (4) of the invariant< / span > < span class = "named-paragraph-number" > 4.4< / span > < / a > < / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > next_alternative< / span > < span class = "plain-syntax" > )< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > ec< / span > < span class = "plain-syntax" > += < / span > < a href = "2-tv.html#SP4" class = "function-link" > < span class = "function-syntax" > VerifyTree::verify_structure_r< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > next_alternative< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > parent< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > ec< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > ec< / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > }< / span >
< / pre >
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< p class = "commentary firstcommentary" > < a id = "SP4_1" class = "paragraph-anchor" > < / a > < b > § 4.1. < / b > Rule (1): no INVALID nodes.
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< / p >
< p class = "commentary" > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Check rule (1) of the invariant< / span > < span class = "named-paragraph-number" > 4.1< / span > < / span > < span class = "comment-syntax" > =< / span >
< / p >
< pre class = "displayed-code all-displayed-code code-font" >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > t< / span > < span class = "plain-syntax" > == < / span > < span class = "constant-syntax" > INVALID_NT< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LOG< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "N%d is $N, which is not allowed except temporarily\n"< / span > < span class = "plain-syntax" > ,< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > allocation_id< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > t< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "2-tv.html#SP4_1_1" class = "named-paragraph-link" > < span class = "named-paragraph" > Log this invariant failure< / span > < span class = "named-paragraph-number" > 4.1.1< / span > < / a > < / span >
< span class = "plain-syntax" > }< / span >
< / pre >
< ul class = "endnotetexts" > < li > This code is used in < a href = "2-tv.html#SP4" > § 4< / a > .< / li > < / ul >
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< p class = "commentary firstcommentary" > < a id = "SP4_2" class = "paragraph-anchor" > < / a > < b > § 4.2. < / b > Rule (2): all annotations must be legal for the given node type.
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< / p >
< p class = "commentary" > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Check rule (2) of the invariant< / span > < span class = "named-paragraph-number" > 4.2< / span > < / span > < span class = "comment-syntax" > =< / span >
< / p >
< pre class = "displayed-code all-displayed-code code-font" >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > for< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > parse_node_annotation< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > pna< / span > < span class = "plain-syntax" > =< / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > annotations< / span > < span class = "plain-syntax" > ; < / span > < span class = "identifier-syntax" > pna< / span > < span class = "plain-syntax" > ; < / span > < span class = "identifier-syntax" > pna< / span > < span class = "plain-syntax" > =< / span > < span class = "identifier-syntax" > pna< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > next_annotation< / span > < span class = "plain-syntax" > )< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (!(< / span > < a href = "2-na.html#SP15" class = "function-link" > < span class = "function-syntax" > Annotations::is_allowed< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > t< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > pna< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > annotation_id< / span > < span class = "plain-syntax" > ))) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LOG< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "N%d is $N, which is not allowed to have annotation %d\n"< / span > < span class = "plain-syntax" > ,< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > allocation_id< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > t< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > pna< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > annotation_id< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LOG< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "Node %08x, ann %d\n"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > t< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > pna< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > annotation_id< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "2-tv.html#SP4_1_1" class = "named-paragraph-link" > < span class = "named-paragraph" > Log this invariant failure< / span > < span class = "named-paragraph-number" > 4.1.1< / span > < / a > < / span >
< span class = "plain-syntax" > }< / span >
< / pre >
< ul class = "endnotetexts" > < li > This code is used in < a href = "2-tv.html#SP4" > § 4< / a > .< / li > < / ul >
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< p class = "commentary firstcommentary" > < a id = "SP4_3" class = "paragraph-anchor" > < / a > < b > § 4.3. < / b > Rule (3): can this combination of parent and child exist?
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< / p >
< p class = "commentary" > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Check rule (3) of the invariant< / span > < span class = "named-paragraph-number" > 4.3< / span > < / span > < span class = "comment-syntax" > =< / span >
< / p >
< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "plain-syntax" > < / span > < span class = "constant-syntax" > node_type_t< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > t_parent< / span > < span class = "plain-syntax" > = < / span > < a href = "2-pn.html#SP5" class = "function-link" > < span class = "function-syntax" > Node::get_type< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > parent< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (!(< / span > < a href = "2-nt.html#SP13" class = "function-link" > < span class = "function-syntax" > NodeType::parentage_allowed< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > t_parent< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > t< / span > < span class = "plain-syntax" > ))) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LOG< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "N%d is $N: should not be a child of $N\n"< / span > < span class = "plain-syntax" > ,< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > allocation_id< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > t< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > t_parent< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "2-tv.html#SP4_1_1" class = "named-paragraph-link" > < span class = "named-paragraph" > Log this invariant failure< / span > < span class = "named-paragraph-number" > 4.1.1< / span > < / a > < / span >
< span class = "plain-syntax" > }< / span >
< / pre >
< ul class = "endnotetexts" > < li > This code is used in < a href = "2-tv.html#SP4" > § 4< / a > .< / li > < / ul >
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< p class = "commentary firstcommentary" > < a id = "SP4_4" class = "paragraph-anchor" > < / a > < b > § 4.4. < / b > Rule (4): The number of children has to be within the given extrema.
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< / p >
< p class = "commentary" > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Check rule (4) of the invariant< / span > < span class = "named-paragraph-number" > 4.4< / span > < / span > < span class = "comment-syntax" > =< / span >
< / p >
< pre class = "displayed-code all-displayed-code code-font" >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > children_count< / span > < span class = "plain-syntax" > < < / span > < span class = "identifier-syntax" > metadata< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > min_children< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LOG< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "N%d has %d children, but min for $N is %d:\n"< / span > < span class = "plain-syntax" > ,< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > allocation_id< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > children_count< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > t< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > metadata< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > min_children< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "2-tv.html#SP4_1_1" class = "named-paragraph-link" > < span class = "named-paragraph" > Log this invariant failure< / span > < span class = "named-paragraph-number" > 4.1.1< / span > < / a > < / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > children_count< / span > < span class = "plain-syntax" > > < / span > < span class = "identifier-syntax" > metadata< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > max_children< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LOG< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "N%d has %d children, but max for $N is %d:\n"< / span > < span class = "plain-syntax" > ,< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > allocation_id< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > children_count< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > t< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > metadata< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > max_children< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "2-tv.html#SP4_1_1" class = "named-paragraph-link" > < span class = "named-paragraph" > Log this invariant failure< / span > < span class = "named-paragraph-number" > 4.1.1< / span > < / a > < / span >
< span class = "plain-syntax" > }< / span >
< / pre >
< ul class = "endnotetexts" > < li > This code is used in < a href = "2-tv.html#SP4" > § 4< / a > .< / li > < / ul >
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< p class = "commentary firstcommentary" > < a id = "SP4_1_1" class = "paragraph-anchor" > < / a > < b > § 4.1.1. < / b > (Logging the root node produces an absolutely enormous output.)
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< / p >
< p class = "commentary" > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Log this invariant failure< / span > < span class = "named-paragraph-number" > 4.1.1< / span > < / span > < span class = "comment-syntax" > =< / span >
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< / p >
< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < a href = "2-pn.html#SP5" class = "function-link" > < span class = "function-syntax" > Node::is< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > parent< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > ROOT_NT< / span > < span class = "plain-syntax" > )) < / span > < span class = "identifier-syntax" > LOG< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "Failing subtree:\n$T"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > else< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LOG< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "Failing subtree:\n$T"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > parent< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > ec< / span > < span class = "plain-syntax" > ++;< / span >
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< / pre >
< ul class = "endnotetexts" > < li > This code is used in < a href = "2-tv.html#SP4_1" > § 4.1< / a > , < a href = "2-tv.html#SP4_2" > § 4.2< / a > , < a href = "2-tv.html#SP4_3" > § 4.3< / a > , < a href = "2-tv.html#SP4_4" > § 4.4< / a > (twice).< / li > < / ul >
< nav role = "progress" > < div class = "progresscontainer" >
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< ul class = "progressbar" > < li class = "progressprev" > < a href = "2-na.html" > ❮ < / a > < / li > < li class = "progresschapter" > < a href = "P-wtmd.html" > P< / a > < / li > < li class = "progresschapter" > < a href = "1-sm.html" > 1< / a > < / li > < li class = "progresscurrentchapter" > 2< / li > < li class = "progresssection" > < a href = "2-st.html" > st< / a > < / li > < li class = "progresssection" > < a href = "2-nt.html" > nt< / a > < / li > < li class = "progresssection" > < a href = "2-pn.html" > pn< / a > < / li > < li class = "progresssection" > < a href = "2-na.html" > na< / a > < / li > < li class = "progresscurrent" > tv< / li > < li class = "progresssection" > < a href = "2-spc.html" > spc< / a > < / li > < li class = "progresschapter" > < a href = "3-snt.html" > 3< / a > < / li > < li class = "progressnext" > < a href = "2-spc.html" > ❯ < / a > < / li > < / ul > < / div >
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< / nav > <!-- End of weave -->
< / main >
< / body >
< / html >
