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[clang][bytecode] Handle __builtin_wcslen #118446

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Merged
merged 1 commit into from
Dec 3, 2024
Merged

[clang][bytecode] Handle __builtin_wcslen #118446

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4 changes: 3 additions & 1 deletion clang/lib/AST/ByteCode/InterpBuiltin.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -243,7 +243,7 @@ static bool interp__builtin_strlen(InterpState &S, CodePtr OpPC,
unsigned ID = Func->getBuiltinID();
const Pointer &StrPtr = getParam<Pointer>(Frame, 0);

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

if (!CheckArray(S, OpPC, StrPtr))
Expand Down Expand Up @@ -1857,6 +1857,8 @@ bool InterpretBuiltin(InterpState &S, CodePtr OpPC, const Function *F,
break;
case Builtin::BI__builtin_strlen:
case Builtin::BIstrlen:
case Builtin::BI__builtin_wcslen:
case Builtin::BIwcslen:
if (!interp__builtin_strlen(S, OpPC, Frame, F, Call))
return false;
break;
Expand Down
12 changes: 12 additions & 0 deletions clang/test/AST/ByteCode/builtin-functions.cpp
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Expand Up @@ -7,6 +7,10 @@
// RUN: %clang_cc1 -triple avr -std=c++20 -Wno-string-plus-int -fexperimental-new-constant-interpreter %s -verify=expected,both
// RUN: %clang_cc1 -triple avr -std=c++20 -Wno-string-plus-int -verify=ref,both %s -Wno-constant-evaluated

extern "C" {
typedef decltype(sizeof(int)) size_t;
extern size_t wcslen(const wchar_t *p);
}

namespace strcmp {
constexpr char kFoobar[6] = {'f','o','o','b','a','r'};
Expand Down Expand Up @@ -85,6 +89,14 @@ constexpr const char *a = "foo\0quux";
constexpr char d[] = { 'f', 'o', 'o' }; // no nul terminator.
constexpr int bad = __builtin_strlen(d); // both-error {{constant expression}} \
// both-note {{one-past-the-end}}

constexpr int wn = __builtin_wcslen(L"hello");
static_assert(wn == 5);
constexpr int wm = wcslen(L"hello"); // both-error {{constant expression}} \
// both-note {{non-constexpr function 'wcslen' cannot be used in a constant expression}}

int arr[3]; // both-note {{here}}
int wk = arr[wcslen(L"hello")]; // both-warning {{array index 5}}
}

namespace nan {
Expand Down
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