================
@@ -2220,6 +2220,11 @@ llvm::Constant
*ConstantLValueEmitter::emitPointerAuthPointer(const Expr *E) {
// The assertions here are all checked by Sema.
assert(Result.Val.isLValue());
+ auto *Base = Result.Val.getLValueBase().get<const ValueDecl *>();
+ if (auto *Decl = dyn_cast_or_null<FunctionDecl>(Base)) {
+ assert(Result.Val.getLValueOffset().isZero());
+ return CGM.getRawFunctionPointer(Decl);
----------------
ahatanak wrote:
The checks in `SemaChecking.cpp` and the assertion in `emitPointerAuthPointer`
ensure that the expression of the first argument to
`__builtin_ptrauth_sign_constant` evaluates to an `LValue` with a `ValueDecl`
base. With that restriction, a call to `emitAbstract` returns a signed pointer
only when the argument points to a function definition (see
`ConstantLValueEmitter::tryEmitBase`). Since we are special-casing functions
here, the call to `emitAbstract` returns an unsigned pointer.
https://github.com/llvm/llvm-project/pull/96992
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