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Merge pull request #21060 from hvitved/shared/unbound-list
Shared: Add library for unbound lists
This commit is contained in:
Tom Hvitved
@@ -224,25 +224,17 @@ signature module InputSig1<LocationSig Location> {
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module Make1<LocationSig Location, InputSig1<Location> Input1> {
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private import Input1
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private import codeql.util.UnboundList as UnboundListImpl
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private module TypeParameter {
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private import codeql.util.DenseRank
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private module UnboundListInput implements UnboundListImpl::InputSig<Location> {
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class Element = TypeParameter;
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private module DenseRankInput implements DenseRankInputSig {
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class Ranked = TypeParameter;
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predicate getId = getTypeParameterId/1;
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predicate getRank = getTypeParameterId/1;
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}
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int getRank(TypeParameter tp) { tp = DenseRank<DenseRankInput>::denseRank(result) }
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string encode(TypeParameter tp) { result = getRank(tp).toString() }
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bindingset[s]
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TypeParameter decode(string s) { encode(result) = s }
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predicate getLengthLimit = getTypePathLimit/0;
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}
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final private class String = string;
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private import UnboundListImpl::Make<Location, UnboundListInput>
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/**
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* A path into a type.
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@@ -274,101 +266,10 @@ module Make1<LocationSig Location, InputSig1<Location> Input1> {
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* implementation uses unique type parameter identifiers, in order to not mix
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* up type parameters from different types.
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*/
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class TypePath extends String {
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bindingset[this]
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TypePath() { exists(this) }
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bindingset[this]
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private TypeParameter getTypeParameter(int i) {
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result = TypeParameter::decode(this.splitAt(".", i))
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}
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/** Gets a textual representation of this type path. */
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bindingset[this]
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string toString() {
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result =
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concat(int i, TypeParameter tp |
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tp = this.getTypeParameter(i)
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tp.toString(), "." order by i
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)
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}
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/** Holds if this type path is empty. */
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predicate isEmpty() { this = "" }
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/** Gets the length of this path. */
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bindingset[this]
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pragma[inline_late]
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int length() {
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// Same as
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// `result = count(this.indexOf("."))`
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// but performs better because it doesn't use an aggregate
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result = this.regexpReplaceAll("[0-9]+", "").length()
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}
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/** Gets the path obtained by appending `suffix` onto this path. */
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bindingset[this, suffix]
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TypePath append(TypePath suffix) {
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result = this + suffix and
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(
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not exists(getTypePathLimit())
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or
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result.length() <= getTypePathLimit()
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)
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}
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/**
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* Gets the path obtained by appending `suffix` onto this path.
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*
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* Unlike `append`, this predicate has `result` in the binding set,
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* so there is no need to check the length of `result`.
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*/
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bindingset[this, result]
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TypePath appendInverse(TypePath suffix) { suffix = result.stripPrefix(this) }
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/** Gets the path obtained by removing `prefix` from this path. */
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bindingset[this, prefix]
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TypePath stripPrefix(TypePath prefix) { this = prefix + result }
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/** Holds if this path starts with `tp`, followed by `suffix`. */
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bindingset[this]
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predicate isCons(TypeParameter tp, TypePath suffix) {
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exists(string regexp | regexp = "([0-9]+)\\.(.*)" |
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tp = TypeParameter::decode(this.regexpCapture(regexp, 1)) and
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suffix = this.regexpCapture(regexp, 2)
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)
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}
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/** Holds if this path starts with `prefix`, followed by `tp`. */
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bindingset[this]
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predicate isSnoc(TypePath prefix, TypeParameter tp) {
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exists(string regexp | regexp = "(|.+\\.)([0-9]+)\\." |
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prefix = this.regexpCapture(regexp, 1) and
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tp = TypeParameter::decode(this.regexpCapture(regexp, 2))
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)
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}
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/** Gets the head of this path, if any. */
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bindingset[this]
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TypeParameter getHead() { result = this.getTypeParameter(0) }
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}
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class TypePath = UnboundList;
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/** Provides predicates for constructing `TypePath`s. */
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module TypePath {
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/** Gets the empty type path. */
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TypePath nil() { result.isEmpty() }
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/** Gets the singleton type path `tp`. */
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TypePath singleton(TypeParameter tp) { result = TypeParameter::encode(tp) + "." }
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/**
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* Gets the type path obtained by appending the singleton type path `tp`
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* onto `suffix`.
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*/
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bindingset[suffix]
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TypePath cons(TypeParameter tp, TypePath suffix) { result = singleton(tp).append(suffix) }
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}
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module TypePath = UnboundList;
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/**
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* A class that has a type tree associated with it.
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@@ -600,11 +501,7 @@ module Make1<LocationSig Location, InputSig1<Location> Input1> {
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private TypeParameter getNthTypeParameter(TypeAbstraction abs, int i) {
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result =
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rank[i + 1](TypeParameter tp |
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tp = abs.getATypeParameter()
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tp order by TypeParameter::getRank(tp)
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)
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rank[i + 1](TypeParameter tp | tp = abs.getATypeParameter() | tp order by getRank(tp))
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}
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/**
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153
shared/util/codeql/util/UnboundList.qll
Normal file
153
shared/util/codeql/util/UnboundList.qll
Normal file
@@ -0,0 +1,153 @@
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/**
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* Provides logic for representing unbound lists.
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*
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* The lists are represented internally as strings, and generally it should
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* be preferred to instead use a `newtype` representation, but in certain
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* cases where this is not feasible (typically because of performance) unbound
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* lists can be used.
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*/
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overlay[local?]
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module;
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private import Location
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/** Provides the input to `Make`. */
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signature module InputSig<LocationSig Location> {
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/** An element. */
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class Element {
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/** Gets a textual representation of this element. */
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string toString();
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/** Gets the location of this element. */
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Location getLocation();
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}
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/** Gets a unique ID used to identify element `e` amongst all elements. */
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int getId(Element e);
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/**
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* Gets a textual representation for element `e`, which will be used in the
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* `toString` representation for unbound lists.
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*/
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default string getElementString(Element e) { result = e.toString() }
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/** Gets an optional length limit for unbound lists. */
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default int getLengthLimit() { none() }
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}
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final private class String = string;
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/** Provides the `UnboundList` implementation. */
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module Make<LocationSig Location, InputSig<Location> Input> {
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private import Input
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private import codeql.util.DenseRank
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// Use dense ranking to assign compact IDs to elements
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private module DenseRankInput implements DenseRankInputSig {
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class Ranked = Element;
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predicate getRank = getId/1;
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}
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/** Gets the rank of element `e`, which is used internally in the string encoding. */
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int getRank(Element e) { e = DenseRank<DenseRankInput>::denseRank(result) }
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private string encode(Element e) { result = getRank(e).toString() }
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bindingset[s]
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private Element decode(string s) { encode(result) = s }
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/**
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* An unbound list encoded as a string.
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*/
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class UnboundList extends String {
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bindingset[this]
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UnboundList() { exists(this) }
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/** Gets the `i`th element in this list. */
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bindingset[this]
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private Element getElement(int i) { result = decode(this.splitAt(".", i)) }
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/** Gets a textual representation of this list. */
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bindingset[this]
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string toString() {
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result =
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concat(int i, Element e | e = this.getElement(i) | getElementString(e), "." order by i)
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}
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/** Holds if this list is empty. */
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predicate isEmpty() { this = "" }
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/** Gets the length of this list. */
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bindingset[this]
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pragma[inline_late]
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int length() {
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// Same as
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// `result = count(this.indexOf("."))`
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// but performs better because it doesn't use an aggregate
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result = this.regexpReplaceAll("[0-9]+", "").length()
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}
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/** Gets the list obtained by appending `suffix` onto this list. */
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bindingset[this, suffix]
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UnboundList append(UnboundList suffix) {
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result = this + suffix and
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(
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not exists(getLengthLimit())
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or
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result.length() <= getLengthLimit()
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)
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}
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/**
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* Gets the list obtained by appending `suffix` onto this list.
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*
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* Unlike `append`, this predicate has `result` in the binding set,
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* so there is no need to check the length of `result`.
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*/
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bindingset[this, result]
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UnboundList appendInverse(UnboundList suffix) { suffix = result.stripPrefix(this) }
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/** Gets the list obtained by removing `prefix` from this list. */
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bindingset[this, prefix]
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UnboundList stripPrefix(UnboundList prefix) { this = prefix + result }
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/** Holds if this list starts with `e`, followed by `suffix`. */
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bindingset[this]
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predicate isCons(Element e, UnboundList suffix) {
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exists(string regexp | regexp = "([0-9]+)\\.(.*)" |
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e = decode(this.regexpCapture(regexp, 1)) and
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suffix = this.regexpCapture(regexp, 2)
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)
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}
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/** Holds if this list starts with `prefix`, followed by `e`. */
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bindingset[this]
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predicate isSnoc(UnboundList prefix, Element e) {
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exists(string regexp | regexp = "(|.+\\.)([0-9]+)\\." |
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prefix = this.regexpCapture(regexp, 1) and
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e = decode(this.regexpCapture(regexp, 2))
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)
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}
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/** Gets the head of this list, if any. */
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bindingset[this]
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Element getHead() { result = this.getElement(0) }
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}
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/** Provides predicates for constructing `UnboundList`s. */
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module UnboundList {
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/** Gets the empty list. */
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UnboundList nil() { result.isEmpty() }
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/** Gets the singleton list `e`. */
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UnboundList singleton(Element e) { result = encode(e) + "." }
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/**
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* Gets the list obtained by appending the singleton list `e`
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* onto `suffix`.
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*/
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bindingset[suffix]
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UnboundList cons(Element e, UnboundList suffix) { result = singleton(e).append(suffix) }
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}
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}
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