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Allow conversion between T* and Cpp.void*. (#6575)

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Support an implicit conversion from `T*` to `Cpp.void*` and to `const
Cpp.void*`, and an `unsafe as` conversion in the opposite direction.

In order to support C++ calls taking and returning `void*` (which get
mapped to Carbon `Optional(Cpp.void*)`, also support conversions from
`Optional(T)` to `Optional(U)` if there's a conversion from `T` to `U`.

Fix a bug in `OptionalStorage` for `T*` where its `HasValue` was exactly
backwards.
This commit is contained in:
Richard Smith
2026-01-12 16:32:15 +00:00
committed by GitHub
parent d1b13194d5
commit 31919afa24
31 changed files with 986 additions and 381 deletions
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toolchain/sem_ir/builtin_function_kind.cpp
+7
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@@ -719,6 +719,13 @@ constexpr BuiltinInfo PointerIsNull = {
"pointer.is_null",
ValidateSignature<auto(MaybeUnformed<PointerTo<AnyType>>)->Bool>};
// "pointer.unsafe_convert": convert a pointer of one type to a pointer of a
// different type without performing any checking that the conversion makes
// sense.
constexpr BuiltinInfo PointerUnsafeConvert = {
"pointer.unsafe_convert",
ValidateSignature<auto(PointerTo<AnyType>)->PointerTo<AnyType>>};
// "type.and": facet type combination.
constexpr BuiltinInfo TypeAnd = {"type.and",
ValidateSignature<auto(Type, Type)->Type>};