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C/C++ overlay: Address review comments

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idrissrio
2025-11-26 14:56:13 +01:00
parent 6c09325838
commit 3d69286382
1 changed files with 28 additions and 19 deletions
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47
cpp/ql/lib/semmle/code/cpp/internal/Overlay.qll
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@@ -10,42 +10,52 @@
overlay[local]
predicate isOverlay() { databaseMetadata("isOverlay", "true") }
/** Gets the file path for a location. */
overlay[local]
private string getLocationFilePath(@location_default loc) {
exists(@file file | locations_default(loc, file, _, _, _, _) | files(file, result))
}
/**
* An element with a single location. Discard if in a changed file.
*/
overlay[local]
private class DiscardableEntityBase extends @element {
/** Gets the path to the file in which this element occurs. */
abstract private class Discardable extends @element {
abstract string getFilePath();
/** Holds if this element exists in the base variant. */
predicate existsInBase() { not isOverlay() }
/** Gets a textual representation of this discardable element. */
string toString() { none() }
}
/**
* Discard an entity from the base if all its locations are in changed files.
* Entities with at least one location in an unchanged file are kept.
*/
overlay[discard_entity]
private predicate discardEntity(@element e) {
private predicate discardable(@element e) {
e = any(Discardable d | d.existsInBase() and overlayChangedFiles(d.getFilePath()))
}
/**
* An element with potentially multiple locations, e.g., variables, functions and types.
* Discard only if all locations are in changed files.
*/
overlay[local]
abstract private class MultiDiscardable extends @element {
abstract string getFilePath();
predicate existsInBase() { not isOverlay() }
string toString() { none() }
}
overlay[discard_entity]
private predicate multiDiscardable(@element e) {
e =
any(DiscardableEntityBase de |
de.existsInBase() and
overlayChangedFiles(de.getFilePath()) and
// Only discard if ALL file paths are in changed files
forall(string path | path = de.getFilePath() | overlayChangedFiles(path))
any(MultiDiscardable d |
d.existsInBase() and
forall(string path | path = d.getFilePath() | overlayChangedFiles(path))
)
}
/** A discardable variable declaration entry. */
overlay[local]
private class DiscardableVarDecl extends DiscardableEntityBase instanceof @var_decl {
private class DiscardableVarDecl extends Discardable instanceof @var_decl {
override string getFilePath() {
exists(@location_default loc | var_decls(this, _, _, _, loc) |
result = getLocationFilePath(loc)
@@ -53,9 +63,8 @@ private class DiscardableVarDecl extends DiscardableEntityBase instanceof @var_d
}
}
/** A discardable variable. */
overlay[local]
private class DiscardableVariable extends DiscardableEntityBase instanceof @variable {
private class DiscardableVariable extends MultiDiscardable instanceof @variable {
override string getFilePath() {
exists(@var_decl vd, @location_default loc | var_decls(vd, this, _, _, loc) |
result = getLocationFilePath(loc)