mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-24 22:02:23 +01:00
Nicholas Bishop
0635f4628f
This works by generating two thunks, one in C++ and one in Carbon. For
example, given this input:
```c++
// Carbon:
fn Callme(f: f32) {}
// C++:
void F() {
// This will call `Callme__cpp_thunk`
Carbon::Callme(1.0);
}
```
These functions are generated:
```c++
// Carbon:
fn Callme__carbon_thunk(ref f: f32) {
// Call the target function.
Callme(f);
}
// C++:
// C++ declaration for the Carbon thunk.
void Callme__carbon_thunk(float& f);
void Callme__cpp_thunk(float f) {
// Call the Carbon thunk with args passed by reference.
Callme__carbon_thunk(f);
}
```
For now, all arguments are passed by reference, even if they are simple
types like pointers or i32.
Functions with non-void return types are not supported yet.
131 lines
4.3 KiB
Plaintext
131 lines
4.3 KiB
Plaintext
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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// INCLUDE-FILE: toolchain/testing/testdata/min_prelude/int.carbon
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//
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// AUTOUPDATE
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// TIP: To test this file alone, run:
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// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/interop/cpp/reverse/function.carbon
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// TIP: To dump output, run:
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// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interop/cpp/reverse/function.carbon
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// --- other.carbon
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package Other;
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fn F1() {}
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fn F2() -> i32 { return 0; }
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fn F3(_: i32) {}
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fn HasGenericArg(T:! type, a: T) { a; }
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fn HasDeducedArg[T:! type](a: T) { a; }
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class C {
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fn Method[self: Self]() { self; }
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}
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// --- function.carbon
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library "[[@TEST_NAME]]";
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import Other;
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import Cpp inline '''
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void G() {
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Carbon::Other::F1();
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}
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''';
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// --- fail_todo_non_void.carbon
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library "[[@TEST_NAME]]";
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// CHECK:STDERR: fail_todo_non_void.carbon:[[@LINE+5]]:1: in import [InImport]
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// CHECK:STDERR: other.carbon:4:1: error: semantics TODO: `unsupported: C++ calling a Carbon function with return type other than `()`` [SemanticsTodo]
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// CHECK:STDERR: fn F2() -> i32 { return 0; }
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// CHECK:STDERR: ^~~~~~~~~~~~~~~~
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// CHECK:STDERR:
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import Other;
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import Cpp inline '''
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void G() {
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// CHECK:STDERR: fail_todo_non_void.carbon:[[@LINE+4]]:18: error: no member named 'F2' in namespace 'Carbon::Other' [CppInteropParseError]
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// CHECK:STDERR: 16 | Carbon::Other::F2();
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// CHECK:STDERR: | ^~
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// CHECK:STDERR:
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Carbon::Other::F2();
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}
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''';
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// --- args.carbon
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library "[[@TEST_NAME]]";
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import Other;
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import Cpp inline '''
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void G() {
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Carbon::Other::F3(123);
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}
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''';
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// --- fail_todo_generic.carbon
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library "[[@TEST_NAME]]";
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// CHECK:STDERR: fail_todo_generic.carbon:[[@LINE+5]]:1: in import [InImport]
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// CHECK:STDERR: other.carbon:7:1: error: semantics TODO: `unsupported: C++ calling a Carbon function with generic parameters` [SemanticsTodo]
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// CHECK:STDERR: fn HasGenericArg(T:! type, a: T) { a; }
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// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// CHECK:STDERR:
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import Other;
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import Cpp inline '''
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void G() {
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// CHECK:STDERR: fail_todo_generic.carbon:[[@LINE+8]]:18: error: no member named 'HasGenericArg' in namespace 'Carbon::Other' [CppInteropParseError]
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// CHECK:STDERR: 20 | Carbon::Other::HasGenericArg<int>(123);
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// CHECK:STDERR: | ^~~~~~~~~~~~~
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// CHECK:STDERR:
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// CHECK:STDERR: fail_todo_generic.carbon:[[@LINE+4]]:35: error: expected '(' for function-style cast or type construction [CppInteropParseError]
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// CHECK:STDERR: 20 | Carbon::Other::HasGenericArg<int>(123);
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// CHECK:STDERR: | ~~~^
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// CHECK:STDERR:
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Carbon::Other::HasGenericArg<int>(123);
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}
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''';
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// --- fail_todo_deduced.carbon
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library "[[@TEST_NAME]]";
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// CHECK:STDERR: fail_todo_deduced.carbon:[[@LINE+5]]:1: in import [InImport]
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// CHECK:STDERR: other.carbon:8:1: error: semantics TODO: `unsupported: C++ calling a Carbon function with generic parameters` [SemanticsTodo]
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// CHECK:STDERR: fn HasDeducedArg[T:! type](a: T) { a; }
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// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// CHECK:STDERR:
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import Other;
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import Cpp inline '''
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void G() {
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// CHECK:STDERR: fail_todo_deduced.carbon:[[@LINE+4]]:18: error: no member named 'HasDeducedArg' in namespace 'Carbon::Other' [CppInteropParseError]
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// CHECK:STDERR: 16 | Carbon::Other::HasDeducedArg(123);
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// CHECK:STDERR: | ^~~~~~~~~~~~~
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// CHECK:STDERR:
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Carbon::Other::HasDeducedArg(123);
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}
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''';
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// --- fail_todo_method.carbon
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library "[[@TEST_NAME]]";
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import Other;
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import Cpp inline '''
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void G() {
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// CHECK:STDERR: fail_todo_method.carbon:[[@LINE+8]]:3: error: invalid use of incomplete type 'Carbon::Other::C' [CppInteropParseError]
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// CHECK:STDERR: 15 | Carbon::Other::C().Method();
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// CHECK:STDERR: | ^~~~~~~~~~~~~~~~~~
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// CHECK:STDERR:
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// CHECK:STDERR: fail_todo_method.carbon:[[@LINE+4]]:21: error: member access into incomplete type 'Carbon::Other::C' [CppInteropParseError]
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// CHECK:STDERR: 15 | Carbon::Other::C().Method();
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// CHECK:STDERR: | ^
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// CHECK:STDERR:
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Carbon::Other::C().Method();
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}
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''';
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