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[clang] static operators should evaluate object argument (reland) (ll…
…vm#80108) This re-applies 30155fc with a fix for clangd. ### Description clang don't evaluate the object argument of `static operator()` and `static operator[]` currently, for example: ```cpp #include <iostream> struct Foo { static int operator()(int x, int y) { std::cout << "Foo::operator()" << std::endl; return x + y; } static int operator[](int x, int y) { std::cout << "Foo::operator[]" << std::endl; return x + y; } }; Foo getFoo() { std::cout << "getFoo()" << std::endl; return {}; } int main() { std::cout << getFoo()(1, 2) << std::endl; std::cout << getFoo()[1, 2] << std::endl; } ``` `getFoo()` is expected to be called, but clang don't call it currently (17.0.6). This PR fixes this issue. Fixes llvm#67976, reland llvm#68485. ### Walkthrough - **clang/lib/Sema/SemaOverload.cpp** - **`Sema::CreateOverloadedArraySubscriptExpr` & `Sema::BuildCallToObjectOfClassType`** Previously clang generate `CallExpr` for static operators, ignoring the object argument. In this PR `CXXOperatorCallExpr` is generated for static operators instead, with the object argument as the first argument. - **`TryObjectArgumentInitialization`** `const` / `volatile` objects are allowed for static methods, so that we can call static operators on them. - **clang/lib/CodeGen/CGExpr.cpp** - **`CodeGenFunction::EmitCall`** CodeGen changes for `CXXOperatorCallExpr` with static operators: emit and ignore the object argument first, then emit the operator call. - **clang/lib/AST/ExprConstant.cpp** - **`ExprEvaluatorBase::handleCallExpr`** Evaluation of static operators in constexpr also need some small changes to work, so that the arguments won't be out of position. - **clang/lib/Sema/SemaChecking.cpp** - **`Sema::CheckFunctionCall`** Code for argument checking also need to be modify, or it will fail the test `clang/test/SemaCXX/overloaded-operator-decl.cpp`. - **clang-tools-extra/clangd/InlayHints.cpp** - **`InlayHintVisitor::VisitCallExpr`** Now that the `CXXOperatorCallExpr` for static operators also have object argument, we should also take care of this situation in clangd. ### Tests - **Added:** - **clang/test/AST/ast-dump-static-operators.cpp** Verify the AST generated for static operators. - **clang/test/SemaCXX/cxx2b-static-operator.cpp** Static operators should be able to be called on const / volatile objects. - **Modified:** - **clang/test/CodeGenCXX/cxx2b-static-call-operator.cpp** - **clang/test/CodeGenCXX/cxx2b-static-subscript-operator.cpp** Matching the new CodeGen. ### Documentation - **clang/docs/ReleaseNotes.rst** Update release notes. --------- Co-authored-by: Shafik Yaghmour <[email protected]> Co-authored-by: cor3ntin <[email protected]> Co-authored-by: Aaron Ballman <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,55 @@ | ||
| // RUN: %clang_cc1 -std=c++23 %s -ast-dump -triple x86_64-unknown-unknown -o - | FileCheck -strict-whitespace %s | ||
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| struct Functor { | ||
| static int operator()(int x, int y) { | ||
| return x + y; | ||
| } | ||
| static int operator[](int x, int y) { | ||
| return x + y; | ||
| } | ||
| }; | ||
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| Functor& get_functor() { | ||
| static Functor functor; | ||
| return functor; | ||
| } | ||
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| void call_static_operators() { | ||
| Functor functor; | ||
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| int z1 = functor(1, 2); | ||
| // CHECK: CXXOperatorCallExpr {{.*}} 'int' '()' | ||
| // CHECK-NEXT: |-ImplicitCastExpr {{.*}} <col:19, col:24> 'int (*)(int, int)' <FunctionToPointerDecay> | ||
| // CHECK-NEXT: | `-DeclRefExpr {{.*}} <col:19, col:24> 'int (int, int)' lvalue CXXMethod {{.*}} 'operator()' 'int (int, int)' | ||
| // CHECK-NEXT: |-DeclRefExpr {{.*}} <col:12> 'Functor' lvalue Var {{.*}} 'functor' 'Functor' | ||
| // CHECK-NEXT: |-IntegerLiteral {{.*}} <col:20> 'int' 1 | ||
| // CHECK-NEXT: `-IntegerLiteral {{.*}} <col:23> 'int' 2 | ||
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| int z2 = functor[1, 2]; | ||
| // CHECK: CXXOperatorCallExpr {{.*}} 'int' '[]' | ||
| // CHECK-NEXT: |-ImplicitCastExpr {{.*}} <col:19, col:24> 'int (*)(int, int)' <FunctionToPointerDecay> | ||
| // CHECK-NEXT: | `-DeclRefExpr {{.*}} <col:19, col:24> 'int (int, int)' lvalue CXXMethod {{.*}} 'operator[]' 'int (int, int)' | ||
| // CHECK-NEXT: |-DeclRefExpr {{.*}} <col:12> 'Functor' lvalue Var {{.*}} 'functor' 'Functor' | ||
| // CHECK-NEXT: |-IntegerLiteral {{.*}} <col:20> 'int' 1 | ||
| // CHECK-NEXT: `-IntegerLiteral {{.*}} <col:23> 'int' 2 | ||
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| int z3 = get_functor()(1, 2); | ||
| // CHECK: CXXOperatorCallExpr {{.*}} 'int' '()' | ||
| // CHECK-NEXT: |-ImplicitCastExpr {{.*}} <col:25, col:30> 'int (*)(int, int)' <FunctionToPointerDecay> | ||
| // CHECK-NEXT: | `-DeclRefExpr {{.*}} <col:25, col:30> 'int (int, int)' lvalue CXXMethod {{.*}} 'operator()' 'int (int, int)' | ||
| // CHECK-NEXT: |-CallExpr {{.*}} <col:12, col:24> 'Functor' lvalue | ||
| // CHECK-NEXT: | `-ImplicitCastExpr {{.*}} <col:12> 'Functor &(*)()' <FunctionToPointerDecay> | ||
| // CHECK-NEXT: | `-DeclRefExpr {{.*}} <col:12> 'Functor &()' lvalue Function {{.*}} 'get_functor' 'Functor &()' | ||
| // CHECK-NEXT: |-IntegerLiteral {{.*}} <col:26> 'int' 1 | ||
| // CHECK-NEXT: `-IntegerLiteral {{.*}} <col:29> 'int' 2 | ||
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| int z4 = get_functor()[1, 2]; | ||
| // CHECK: CXXOperatorCallExpr {{.*}} 'int' '[]' | ||
| // CHECK-NEXT: |-ImplicitCastExpr {{.*}} <col:25, col:30> 'int (*)(int, int)' <FunctionToPointerDecay> | ||
| // CHECK-NEXT: | `-DeclRefExpr {{.*}} <col:25, col:30> 'int (int, int)' lvalue CXXMethod {{.*}} 'operator[]' 'int (int, int)' | ||
| // CHECK-NEXT: |-CallExpr {{.*}} <col:12, col:24> 'Functor' lvalue | ||
| // CHECK-NEXT: | `-ImplicitCastExpr {{.*}} <col:12> 'Functor &(*)()' <FunctionToPointerDecay> | ||
| // CHECK-NEXT: | `-DeclRefExpr {{.*}} <col:12> 'Functor &()' lvalue Function {{.*}} 'get_functor' 'Functor &()' | ||
| // CHECK-NEXT: |-IntegerLiteral {{.*}} <col:26> 'int' 1 | ||
| // CHECK-NEXT: `-IntegerLiteral {{.*}} <col:29> 'int' 2 | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,31 @@ | ||
| // RUN: %clang_cc1 -fsyntax-only -verify -std=c++23 %s | ||
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| // expected-no-diagnostics | ||
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| namespace A { | ||
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| struct Foo { | ||
| static int operator()(int a, int b) { return a + b; } | ||
| static int operator[](int a, int b) { return a + b; } | ||
| }; | ||
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| void ok() { | ||
| // Should pass regardless of const / volatile | ||
| Foo foo; | ||
| foo(1, 2); | ||
| foo[1, 2]; | ||
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| const Foo fooC; | ||
| fooC(1, 2); | ||
| fooC[1, 2]; | ||
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| const Foo fooV; | ||
| fooV(1, 2); | ||
| fooV[1, 2]; | ||
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| const volatile Foo fooCV; | ||
| fooCV(1, 2); | ||
| fooCV[1, 2]; | ||
| } | ||
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| } |