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JS: Hoist function decls in a block to the top of the block

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Asger F
2025-02-03 15:01:13 +01:00
parent 29879297ee
commit be082578d4
2 changed files with 6 additions and 4 deletions
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9
javascript/extractor/src/com/semmle/js/extractor/CFGExtractor.java
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@@ -1255,9 +1255,12 @@ public class CFGExtractor {
@Override
public Void visit(BlockStatement nd, SuccessorInfo i) {
if (nd.getBody().isEmpty()) writeSuccessors(nd, i.getAllSuccessors());
else writeSuccessor(nd, First.of(nd.getBody().get(0)));
visitSequence(nd.getBody(), i.getAllSuccessors());
// Hoist function declarations in a block statement to the top of the block.
// This reflects non-standard behaviour implemented by most engines.
// See also: EcmaScript "B.3.2 Block-Level Function Declarations Web Legacy Compatibility Semantics".
List<Identifier> hoisted = HoistedFunDecls.of(nd.getBody());
hoistedFns.addAll(hoisted);
writeSuccessors(nd, visitSequence(hoisted, nd.getBody(), i.getAllSuccessors()));
return null;
}