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Initial support for interop with class/struct/union fields. (#5849)

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Add a new type, `custom_layout_type`, representing a struct type whose
size, alignment, and field offsets can be manually controlled. Use this
as the object representation type for imported C++ class types (which
also includes struct and union types), allowing us to model C++ class
type layouts. In passing, also add support for incomplete C++ class
types, mapping them into incomplete Carbon class types.

Map C++ fields into Carbon field declarations, allowing direct access to
C++ fields from Carbon. So far, no support is added for base classes nor
anonymous struct or union declarations; those will be added in
subsequent PRs. Also, we don't map C++ access control into Carbon yet,
so all C++ fields are accessible regardless of their access control.

For now we still use a `struct_type` as the object representation for
empty C++ classes, in order to continue to support our existing tests
that convert `{}` to empty C++ class types. This is temporary and should
be removed once we support interop with C++ class initialization.
This commit is contained in:
Richard Smith
2025-07-25 21:09:24 +00:00
committed by GitHub
parent ef748ab36d
commit 36f0a73092
36 changed files with 1772 additions and 592 deletions
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toolchain/check/testdata/interop/cpp/function/pointer.carbon
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@@ -229,7 +229,6 @@ fn F() {
// CHECK:STDOUT: assign %s.var, %.loc8_3
// CHECK:STDOUT: %.loc8_13: type = splice_block %S.ref [concrete = constants.%S] {
// CHECK:STDOUT: %Cpp.ref.loc8: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %S.ref: type = name_ref S, imports.%S.decl [concrete = constants.%S]
// CHECK:STDOUT: }
// CHECK:STDOUT: %s: ref %S = bind_name s, %s.var
@@ -292,7 +291,6 @@ fn F() {
// CHECK:STDOUT: assign %s.var, %.loc8_3
// CHECK:STDOUT: %.loc8_13: type = splice_block %S.ref.loc8 [concrete = constants.%S] {
// CHECK:STDOUT: %Cpp.ref.loc8: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %S.ref.loc8: type = name_ref S, imports.%S.decl [concrete = constants.%S]
// CHECK:STDOUT: }
// CHECK:STDOUT: %s: ref %S = bind_name s, %s.var
@@ -560,7 +558,6 @@ fn F() {
// CHECK:STDOUT: assign %s.var, %.loc8_3
// CHECK:STDOUT: %.loc8_13: type = splice_block %S.ref [concrete = constants.%S] {
// CHECK:STDOUT: %Cpp.ref.loc8: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %S.ref: type = name_ref S, imports.%S.decl [concrete = constants.%S]
// CHECK:STDOUT: }
// CHECK:STDOUT: %s: ref %S = bind_name s, %s.var