mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-24 21:50:14 +01:00
Richard Smith
2952f61095
For now, disable the use of array types as by-var paramters and by-init return types when exporting Carbon functions to C++, as C++ does not support raw arrays being passed or returned by value. Assisted-by: Gemini via Antigravity
105 lines
3.9 KiB
Plaintext
105 lines
3.9 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/function/export/array.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/function/export/array.carbon
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// --- array_value_param.carbon
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library "[[@TEST_NAME]]";
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import Cpp;
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fn F(a: array(i32, 5)) -> i32 { return a[2]; }
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inline Cpp '''
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int G() {
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int arr[5];
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//@dump-sem-ir-begin
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return Carbon::F(arr);
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//@dump-sem-ir-end
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}
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int H() {
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//@dump-sem-ir-begin
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return Carbon::F({1, 2, 3, 4, 5});
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//@dump-sem-ir-end
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}
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''';
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// --- fail_todo_array_var_param.carbon
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library "[[@TEST_NAME]]";
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import Cpp;
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// We do not currently support C++ calls to functions with by-var array
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// parameters, as C++ does not have such parameters.
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// TODO: Support this, perhaps using Clang's `ArrayParameterType`, which is an
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// HLSL extension, or by mapping to a `std::array` parameter.
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// TODO: These diagnostics are very bad.
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// CHECK:STDERR: fail_todo_array_var_param.carbon:[[@LINE+18]]:1: error: cannot copy value of type `array(i32, 5)` [CopyOfUncopyableType]
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// CHECK:STDERR: fn F(var a: array(i32, 5)) -> i32 { return a[2]; }
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// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// CHECK:STDERR: fail_todo_array_var_param.carbon:[[@LINE+15]]:1: note: type `array(i32, 5)` does not implement interface `Core.Copy` [MissingImplInMemberAccessInContext]
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// CHECK:STDERR: fn F(var a: array(i32, 5)) -> i32 { return a[2]; }
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// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// CHECK:STDERR: fail_todo_array_var_param.carbon:[[@LINE+12]]:6: note: initializing function parameter [InCallToFunctionParam]
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// CHECK:STDERR: fn F(var a: array(i32, 5)) -> i32 { return a[2]; }
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// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~
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// CHECK:STDERR:
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// CHECK:STDERR: fail_todo_array_var_param.carbon:[[@LINE+8]]:1: error: semantics TODO: `by-var array parameter` [SemanticsTodo]
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// CHECK:STDERR: fn F(var a: array(i32, 5)) -> i32 { return a[2]; }
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// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// CHECK:STDERR:
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// CHECK:STDERR: fail_todo_array_var_param.carbon:[[@LINE+4]]:1: error: semantics TODO: `failed to map C++ type to Carbon` [SemanticsTodo]
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// CHECK:STDERR: fn F(var a: array(i32, 5)) -> i32 { return a[2]; }
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// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// CHECK:STDERR:
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fn F(var a: array(i32, 5)) -> i32 { return a[2]; }
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inline Cpp '''
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int G() {
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//@dump-sem-ir-begin
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// CHECK:STDERR: fail_todo_array_var_param.carbon:[[@LINE+4]]:18: error: no member named 'F' in namespace 'Carbon' [CppInteropParseError]
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// CHECK:STDERR: 38 | return Carbon::F({1, 2, 3, 4, 5});
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// CHECK:STDERR: | ^
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// CHECK:STDERR:
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return Carbon::F({1, 2, 3, 4, 5});
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//@dump-sem-ir-end
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}
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''';
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// --- fail_todo_array_return.carbon
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library "[[@TEST_NAME]]";
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import Cpp;
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// We do not currently support C++ calls to functions with array return
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// types, as C++ does not have such return types.
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// TODO: Support this, perhaps by returning a `std::array`.
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// CHECK:STDERR: fail_todo_array_return.carbon:[[@LINE+4]]:1: error: semantics TODO: `array return type` [SemanticsTodo]
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// CHECK:STDERR: fn F() -> array(i32, 5) {
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// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~
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// CHECK:STDERR:
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fn F() -> array(i32, 5) {
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return (1, 2, 3, 4, 5);
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}
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inline Cpp '''
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int G() {
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// CHECK:STDERR: fail_todo_array_return.carbon:[[@LINE+4]]:24: error: no member named 'F' in namespace 'Carbon' [CppInteropParseError]
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// CHECK:STDERR: 23 | auto &&arr = Carbon::F();
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// CHECK:STDERR: | ^
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// CHECK:STDERR:
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auto &&arr = Carbon::F();
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return arr[0];
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}
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''';
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