[clang] [clang][bytecode] Use in `Expr::tryEvaluateString` (PR #160118)

[Timm Baeder via cfe-commits]

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@@ -236,6 +236,48 @@ bool Context::evaluateCharRange(State &Parent, const Expr *SizeExpr,
   return evaluateStringRepr(Parent, SizeExpr, PtrExpr, Result);
 }
 
+bool Context::evaluateString(State &Parent, const Expr *E,
+                             std::string &Result) {
+  assert(Stk.empty());
+  Compiler<EvalEmitter> C(*this, *P, Parent, Stk);
+
+  auto PtrRes = C.interpretAsPointer(E, [&](const Pointer &Ptr) {
+    const Descriptor *FieldDesc = Ptr.getFieldDesc();
+    if (!FieldDesc->isPrimitiveArray())
+      return false;
+
+    if (!Ptr.isConst())
+      return false;
+
+    unsigned N = Ptr.getNumElems();
+    if (Ptr.elemSize() == 1 /* bytes */) {
+      const char *Chars = reinterpret_cast<const char *>(Ptr.getRawAddress());
+      unsigned Length = strnlen(Chars, N);
+      Result.assign(Chars, Length);
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tbaederr wrote:

Indeed.

https://github.com/llvm/llvm-project/pull/160118