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[clang][bytecode][NFC] Diagnose no-constexpr memcpy/strlen versions #118429

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merged 1 commit into from
Dec 3, 2024
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[clang][bytecode][NFC] Diagnose no-constexpr memcpy/strlen versions #118429

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24 changes: 22 additions & 2 deletions clang/lib/AST/ByteCode/InterpBuiltin.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -222,11 +222,25 @@ static bool interp__builtin_strcmp(InterpState &S, CodePtr OpPC,
return true;
}

static void diagnoseNonConstexprBuiltin(InterpState &S, CodePtr OpPC,
unsigned ID) {
auto Loc = S.Current->getSource(OpPC);
if (S.getLangOpts().CPlusPlus11)
S.CCEDiag(Loc, diag::note_constexpr_invalid_function)
<< /*isConstexpr=*/0 << /*isConstructor=*/0
<< ("'" + S.getASTContext().BuiltinInfo.getName(ID) + "'").str();
else
S.CCEDiag(Loc, diag::note_invalid_subexpr_in_const_expr);
}
static bool interp__builtin_strlen(InterpState &S, CodePtr OpPC,
const InterpFrame *Frame,
const CallExpr *Call) {
const Function *Func, const CallExpr *Call) {
unsigned ID = Func->getBuiltinID();
const Pointer &StrPtr = getParam<Pointer>(Frame, 0);

if (ID == Builtin::BIstrlen)
diagnoseNonConstexprBuiltin(S, OpPC, ID);

if (!CheckArray(S, OpPC, StrPtr))
return false;

Expand Down Expand Up @@ -1781,12 +1795,16 @@ static bool interp__builtin_memcpy(InterpState &S, CodePtr OpPC,
const InterpFrame *Frame,
const Function *Func, const CallExpr *Call) {
assert(Call->getNumArgs() == 3);
unsigned ID = Func->getBuiltinID();
Pointer DestPtr = getParam<Pointer>(Frame, 0);
const Pointer &SrcPtr = getParam<Pointer>(Frame, 1);
const APSInt &Size =
peekToAPSInt(S.Stk, *S.getContext().classify(Call->getArg(2)));
assert(!Size.isSigned() && "memcpy and friends take an unsigned size");

if (ID == Builtin::BImemcpy)
diagnoseNonConstexprBuiltin(S, OpPC, ID);

if (DestPtr.isDummy() || SrcPtr.isDummy())
return false;

Expand Down Expand Up @@ -1830,7 +1848,8 @@ bool InterpretBuiltin(InterpState &S, CodePtr OpPC, const Function *F,
return false;
break;
case Builtin::BI__builtin_strlen:
if (!interp__builtin_strlen(S, OpPC, Frame, Call))
case Builtin::BIstrlen:
if (!interp__builtin_strlen(S, OpPC, Frame, F, Call))
return false;
break;
case Builtin::BI__builtin_nan:
Expand Down Expand Up @@ -2271,6 +2290,7 @@ bool InterpretBuiltin(InterpState &S, CodePtr OpPC, const Function *F,
break;

case Builtin::BI__builtin_memcpy:
case Builtin::BImemcpy:
if (!interp__builtin_memcpy(S, OpPC, Frame, F, Call))
return false;
break;
Expand Down
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