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Revert "[clang][ExprConst] Allow comparisons with string literals (#106733)"

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This reverts commit 5d1d2f08c4a92580e7f6b3b6b77b2b6f6184e126.

See the discussion in https://github.com/llvm/llvm-project/pull/106733
and https://github.com/llvm/llvm-project/issues/58754
This commit is contained in:
Timm Bäder 2024-09-17 05:58:51 +02:00
parent 884221eddb
commit 95a0b4f729
3 changed files with 15 additions and 7 deletions
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2
clang/lib/AST/ExprConstant.cpp
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@ -2146,7 +2146,7 @@ static bool IsLiteralLValue(const LValue &Value) {
if (Value.getLValueCallIndex())
return false;
const Expr *E = Value.Base.dyn_cast<const Expr*>();
return E && !isa<MaterializeTemporaryExpr, StringLiteral>(E);
return E && !isa<MaterializeTemporaryExpr>(E);
}
static bool IsWeakLValue(const LValue &Value) {

14
clang/test/AST/ByteCode/cxx20.cpp
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@ -108,16 +108,22 @@ constexpr auto p2 = "test2";
constexpr bool b1 = foo(p1) == foo(p1);
static_assert(b1);
constexpr bool b2 = foo(p1) == foo(p2);
static_assert(!b2);
constexpr bool b2 = foo(p1) == foo(p2); // ref-error {{must be initialized by a constant expression}} \
// ref-note {{comparison of addresses of literals}} \
// ref-note {{declared here}}
static_assert(!b2); // ref-error {{not an integral constant expression}} \
// ref-note {{not a constant expression}}
constexpr auto name1() { return "name1"; }
constexpr auto name2() { return "name2"; }
constexpr auto b3 = name1() == name1();
static_assert(b3);
constexpr auto b4 = name1() == name2();
static_assert(!b4);
constexpr auto b4 = name1() == name2(); // ref-error {{must be initialized by a constant expression}} \
// ref-note {{has unspecified value}} \
// ref-note {{declared here}}
static_assert(!b4); // ref-error {{not an integral constant expression}} \
// ref-note {{not a constant expression}}
namespace UninitializedFields {
class A {

6
clang/test/SemaCXX/constant-expression-cxx11.cpp
View File

@ -358,9 +358,11 @@ struct Str {
extern char externalvar[];
constexpr bool constaddress = (void *)externalvar == (void *)0x4000UL; // expected-error {{must be initialized by a constant expression}} expected-note {{reinterpret_cast}}
constexpr bool litaddress = "foo" == "foo"; // cxx20_23-warning {{comparison between two arrays is deprecated}}
constexpr bool litaddress = "foo" == "foo"; // expected-error {{must be initialized by a constant expression}}
// expected-note@-1 {{comparison of addresses of literals has unspecified value}}
// cxx20_23-warning@-2 {{comparison between two arrays is deprecated}}
static_assert(0 != "foo", "");
static_assert("foo" != "foo", "");// cxx20_23-warning {{comparison between two arrays is deprecated}}
}
namespace MaterializeTemporary {