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C++ interop: support for default arguments. (#6108)

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The general strategy here is to force use of a thunk when we want to use
default arguments, and have Clang generate uses of the default arguments
on its side of the thunk.

To support this, change the key type used in `clang_decls` from being
just a `Decl*` to being a pair of `Decl*` and number of parameters in
the case of function decls. Import distinct `SemIR::Function`s for each
number of parameters that's used, and corresponding distinct thunks.

---------

Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
This commit is contained in:
Richard SmithandJon Ross-Perkins authored and GitHub committed 2025-09-24 01:07:59 +00:00
1 parent 82679e6689
commit 1e7b7e53ae
42 files changed
+2097 -720
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toolchain/check/testdata/interop/cpp/stdlib/string_view.carbon
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+2 -2
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@@ -60,14 +60,14 @@ fn G() -> str {
// CHECK:STDOUT: %F.type: type = fn_type @F [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %F: %F.type = struct_value () [concrete]
// CHECK:STDOUT: %.fd2: type = cpp_overload_set_type @Consume__carbon_thunk [concrete]
// CHECK:STDOUT: %empty_struct.c28: %.fd2 = struct_value () [concrete]
// CHECK:STDOUT: %str.ee0: type = class_type @String [concrete]
// CHECK:STDOUT: %int_64: Core.IntLiteral = int_value 64 [concrete]
// CHECK:STDOUT: %u64: type = class_type @UInt, @UInt(%int_64) [concrete]
// CHECK:STDOUT: %int_8: Core.IntLiteral = int_value 8 [concrete]
// CHECK:STDOUT: %u8: type = class_type @UInt, @UInt(%int_8) [concrete]
// CHECK:STDOUT: %ptr.3e8: type = ptr_type %u8 [concrete]
// CHECK:STDOUT: %.fd2: type = cpp_overload_set_type @Consume__carbon_thunk [concrete]
// CHECK:STDOUT: %empty_struct.c28: %.fd2 = struct_value () [concrete]
// CHECK:STDOUT: %str.3b1: %ptr.3e8 = string_literal "hello" [concrete]
// CHECK:STDOUT: %int_5: %u64 = int_value 5 [concrete]
// CHECK:STDOUT: %String.val: %str.ee0 = struct_value (%str.3b1, %int_5) [concrete]