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[clang][bytecode] Start implementing builtin_is_within_lifetime (#137765)

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This commit is contained in:
Timm Baeder
2025-04-29 10:57:30 +02:00
committed by GitHub
parent 13b443f2ef
commit 4bf356bbd2
2 changed files with 82 additions and 0 deletions
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49
clang/lib/AST/ByteCode/InterpBuiltin.cpp
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@@ -2198,6 +2198,50 @@ static bool interp__builtin_object_size(InterpState &S, CodePtr OpPC,
return true;
}
static bool interp__builtin_is_within_lifetime(InterpState &S, CodePtr OpPC,
const CallExpr *Call) {
if (!S.inConstantContext())
return false;
const Pointer &Ptr = S.Stk.peek<Pointer>();
auto Error = [&](int Diag) {
bool CalledFromStd = false;
const auto *Callee = S.Current->getCallee();
if (Callee && Callee->isInStdNamespace()) {
const IdentifierInfo *Identifier = Callee->getIdentifier();
CalledFromStd = Identifier && Identifier->isStr("is_within_lifetime");
}
S.CCEDiag(CalledFromStd
? S.Current->Caller->getSource(S.Current->getRetPC())
: S.Current->getSource(OpPC),
diag::err_invalid_is_within_lifetime)
<< (CalledFromStd ? "std::is_within_lifetime"
: "__builtin_is_within_lifetime")
<< Diag;
return false;
};
if (Ptr.isZero())
return Error(0);
if (Ptr.isOnePastEnd())
return Error(1);
bool Result = true;
if (!Ptr.isActive()) {
Result = false;
} else {
if (!CheckLive(S, OpPC, Ptr, AK_Read))
return false;
if (!CheckMutable(S, OpPC, Ptr))
return false;
}
pushInteger(S, Result, Call->getType());
return true;
}
bool InterpretBuiltin(InterpState &S, CodePtr OpPC, const CallExpr *Call,
uint32_t BuiltinID) {
if (!S.getASTContext().BuiltinInfo.isConstantEvaluated(BuiltinID))
@@ -2707,6 +2751,11 @@ bool InterpretBuiltin(InterpState &S, CodePtr OpPC, const CallExpr *Call,
return false;
break;
case Builtin::BI__builtin_is_within_lifetime:
if (!interp__builtin_is_within_lifetime(S, OpPC, Call))
return false;
break;
default:
S.FFDiag(S.Current->getLocation(OpPC),
diag::note_invalid_subexpr_in_const_expr)