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C++: Improve the QL doc of isConstant

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This commit is contained in:
Jeroen Ketema
2023-08-03 12:16:12 +02:00
parent 5950865b55
commit 7ff6f09626
1 changed files with 13 additions and 1 deletions
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14
cpp/ql/lib/semmle/code/cpp/exprs/Expr.qll
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@@ -152,7 +152,19 @@ class Expr extends StmtParent, @expr {
else result = this.getValue()
}
/** Holds if this expression has a value that can be determined at compile time. */
/**
* Holds if this expression has a value that can be determined at compile time.
*
* An expression has a value that can be determined at compile time when:
* - it is a compile-time constant, e.g., a literal value or the result of a constexpr
* compile-time constant;
* - it is an address of a (member) function, an address of a constexpr variable
* initialized to a constant address, or an address of an lvalue, or any of the
* previous with a constant value added to or subtracted from the address;
* - it is a reference to a (member) function, a reference to a constexpr variable
* initialized to a constant address, or a reference to an lvalue;
* - it is a non-template parameter of a uninstantiated template.
*/
cached
predicate isConstant() {
valuebind(_, underlyingElement(this))