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Improve support for qualification conversions. (#5999)

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* Treat `MaybeUnformed` and `partial` as qualifiers, like `const`.
* Allow pointer conversions to add qualifiers.
* Allow unsafe pointer conversions to remove qualifiers.
* Allow conversions on non-reference expressions to drop `const`.
* Allow unsafe conversions on any expression to drop `const`.
* Allow unsafe conversions on non-initializing expressions to drop
  `partial`. For initializing expressions, we should initialize the
  vptr when dropping `partial`; this is not yet supported so we reject.
* Allow conversions on reference expressions to add `MaybeUnformed`.
* Allow unsafe conversions on reference expressions to drop
  `MaybeUnformed`. For non-reference expressions, additional work is
  required, because the value / initializing representation may not
  match between `T` and `MaybeUnformed(T)`, so those are rejected for
  now.
This commit is contained in:
Richard Smith
2025-09-03 21:00:12 +00:00
committed by GitHub
parent 10fab24451
commit cb5e2e1597
15 changed files with 1285 additions and 100 deletions
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toolchain/check/testdata/interop/cpp/class/base.carbon
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@@ -178,6 +178,13 @@ library "[[@TEST_NAME]]";
import Cpp library "virtual_inheritance.h";
fn Convert(p: Cpp.B*) -> Cpp.A* {
// CHECK:STDERR: fail_todo_use_virtual_inheritance.carbon:[[@LINE+21]]:3: error: semantics TODO: `class with virtual bases` [SemanticsTodo]
// CHECK:STDERR: return p;
// CHECK:STDERR: ^~~~~~~~~
// CHECK:STDERR: fail_todo_use_virtual_inheritance.carbon:[[@LINE+18]]:3: note: while completing C++ type `Cpp.B` [InCppTypeCompletion]
// CHECK:STDERR: return p;
// CHECK:STDERR: ^~~~~~~~~
// CHECK:STDERR:
// CHECK:STDERR: fail_todo_use_virtual_inheritance.carbon:[[@LINE+14]]:3: error: semantics TODO: `class with virtual bases` [SemanticsTodo]
// CHECK:STDERR: return p;
// CHECK:STDERR: ^~~~~~~~~