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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/check/eval.cpp
+2 -1
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@@ -1783,7 +1783,8 @@ static auto MakeConstantForBuiltinCall(EvalContext& eval_context,
case SemIR::BuiltinFunctionKind::IntLeftShiftAssign:
case SemIR::BuiltinFunctionKind::IntRightShiftAssign:
case SemIR::BuiltinFunctionKind::PointerMakeNull:
case SemIR::BuiltinFunctionKind::PointerIsNull: {
case SemIR::BuiltinFunctionKind::PointerIsNull:
case SemIR::BuiltinFunctionKind::PointerUnsafeConvert: {
// These are runtime-only builtins.
// TODO: Consider tracking this on the `BuiltinFunctionKind`.
return SemIR::ConstantId::NotConstant;