Files
carbon-lang/toolchain/check/testdata/interop/cpp/function/function.carbon
T
Richard SmithandJon Ross-Perkins 925250f8f9 Improve diagnostics for overload resolution failure. (#6091)
Include notes listing the candidates and explaining why they didn't
work. Rather than duplicating the (substantial) logic for this, use the
Clang machinery to generate these diagnostics.

In order to support this, add a mechanism to map `SemIR::LocId`s to
`clang::SourceLocation`s. This works by creating source buffers in Clang
that refer into the Carbon source file so that `SourceLocation`s can
point into them.

---------

Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
2025-09-19 20:22:47 +00:00

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18 KiB
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// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
// INCLUDE-FILE: toolchain/testing/testdata/min_prelude/primitives.carbon
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/interop/cpp/function/function.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interop/cpp/function/function.carbon
// ============================================================================
// Global
// ============================================================================
// --- global.h
auto foo() -> void;
// --- import_global.carbon
library "[[@TEST_NAME]]";
import Cpp library "global.h";
fn MyF() {
//@dump-sem-ir-begin
Cpp.foo();
//@dump-sem-ir-end
}
// --- fail_import_global_use_different_name.carbon
library "[[@TEST_NAME]]";
import Cpp library "global.h";
fn MyF() {
// CHECK:STDERR: fail_import_global_use_different_name.carbon:[[@LINE+4]]:3: error: member name `bar` not found in `Cpp` [MemberNameNotFoundInInstScope]
// CHECK:STDERR: Cpp.bar();
// CHECK:STDERR: ^~~~~~~
// CHECK:STDERR:
Cpp.bar();
}
// ============================================================================
// Carbon keyword name
// ============================================================================
// --- special_name.h
auto base() -> void;
// --- fail_import_special_name_call_unescaped.carbon
library "[[@TEST_NAME]]";
import Cpp library "special_name.h";
fn MyF() {
// CHECK:STDERR: fail_import_special_name_call_unescaped.carbon:[[@LINE+4]]:3: error: member name `base` not found in `Cpp` [MemberNameNotFoundInInstScope]
// CHECK:STDERR: Cpp.base();
// CHECK:STDERR: ^~~~~~~~
// CHECK:STDERR:
Cpp.base();
}
// --- import_special_name_call_escaped.carbon
library "[[@TEST_NAME]]";
import Cpp library "special_name.h";
fn MyF() {
//@dump-sem-ir-begin
Cpp.r#base();
//@dump-sem-ir-end
}
// ============================================================================
// Overloaded
// ============================================================================
// --- overloaded.h
auto foo() -> void;
auto foo(int value) -> void;
// --- import_overloaded.carbon
library "[[@TEST_NAME]]";
import Cpp library "overloaded.h";
fn F() {
//@dump-sem-ir-begin
Cpp.foo();
//@dump-sem-ir-end
}
// ============================================================================
// Variadic arguments
// ============================================================================
// --- variadic.h
auto foo(int x, ...) -> void;
// --- fail_todo_import_variadic.carbon
library "[[@TEST_NAME]]";
import Cpp library "variadic.h";
fn F() {
//@dump-sem-ir-begin
// CHECK:STDERR: fail_todo_import_variadic.carbon:[[@LINE+4]]:3: error: semantics TODO: `Unsupported: Variadic function` [SemanticsTodo]
// CHECK:STDERR: Cpp.foo(8);
// CHECK:STDERR: ^~~~~~~~~~
// CHECK:STDERR:
Cpp.foo(8);
//@dump-sem-ir-end
}
// ============================================================================
// Static
// ============================================================================
// --- static.h
static auto foo() -> void;
// --- todo_fail_import_static.carbon
library "[[@TEST_NAME]]";
// TODO: Promote this warning to an error by default.
// CHECK:STDERR: todo_fail_import_static.carbon:[[@LINE+4]]:10: in file included here [InCppInclude]
// CHECK:STDERR: ./static.h:2:13: warning: function 'foo' has internal linkage but is not defined [CppInteropParseWarning]
// CHECK:STDERR: 2 | static auto foo() -> void;
// CHECK:STDERR: | ^
import Cpp library "static.h";
fn F() {
//@dump-sem-ir-begin
// CHECK:STDERR: todo_fail_import_static.carbon:[[@LINE+4]]:11: note: used here [CppInteropParseNote]
// CHECK:STDERR: 17 | Cpp.foo();
// CHECK:STDERR: | ^
// CHECK:STDERR:
Cpp.foo();
//@dump-sem-ir-end
}
// --- template_function.h
template<typename T>
auto foo(T a) -> void;
template<typename T>
auto bar(T a) -> T;
// --- import_template_function.carbon
library "[[@TEST_NAME]]";
import Cpp library "template_function.h";
fn F() {
//@dump-sem-ir-begin
Cpp.foo(1 as i32);
//@dump-sem-ir-end
}
fn G() -> i32 {
//@dump-sem-ir-begin
return Cpp.bar(1 as i32);
//@dump-sem-ir-end
}
// TODO: Add a test per unsupported param type. See https://github.com/carbon-language/carbon-lang/pull/5477/files/4321e21ed27d987fd71be182d292973fd9849df8#r2094655176
// TODO: Add a test per unsupported return type. See https://github.com/carbon-language/carbon-lang/pull/5477/files/4321e21ed27d987fd71be182d292973fd9849df8#r2094655176
// CHECK:STDOUT: --- import_global.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %.c5d: type = cpp_overload_set_type @foo [concrete]
// CHECK:STDOUT: %empty_struct: %.c5d = struct_value () [concrete]
// CHECK:STDOUT: %foo.type: type = fn_type @foo [concrete]
// CHECK:STDOUT: %foo: %foo.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .foo = %.a21
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %.a21: %.c5d = cpp_overload_set_value @foo [concrete = constants.%empty_struct]
// CHECK:STDOUT: %foo.decl: %foo.type = fn_decl @foo [concrete = constants.%foo] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @MyF() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %foo.ref: %.c5d = name_ref foo, imports.%.a21 [concrete = constants.%empty_struct]
// CHECK:STDOUT: %foo.call: init %empty_tuple.type = call imports.%foo.decl()
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- import_special_name_call_escaped.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %.f7d: type = cpp_overload_set_type @base [concrete]
// CHECK:STDOUT: %empty_struct: %.f7d = struct_value () [concrete]
// CHECK:STDOUT: %base.type: type = fn_type @base [concrete]
// CHECK:STDOUT: %base: %base.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .r#base = %.6f0
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %.6f0: %.f7d = cpp_overload_set_value @base [concrete = constants.%empty_struct]
// CHECK:STDOUT: %base.decl: %base.type = fn_decl @base [concrete = constants.%base] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @MyF() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %base.ref: %.f7d = name_ref r#base, imports.%.6f0 [concrete = constants.%empty_struct]
// CHECK:STDOUT: %base.call: init %empty_tuple.type = call imports.%base.decl()
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- import_overloaded.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %.c5d: type = cpp_overload_set_type @foo [concrete]
// CHECK:STDOUT: %empty_struct: %.c5d = struct_value () [concrete]
// CHECK:STDOUT: %foo.type: type = fn_type @foo [concrete]
// CHECK:STDOUT: %foo: %foo.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .foo = %.a21
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %.a21: %.c5d = cpp_overload_set_value @foo [concrete = constants.%empty_struct]
// CHECK:STDOUT: %foo.decl: %foo.type = fn_decl @foo [concrete = constants.%foo] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %foo.ref: %.c5d = name_ref foo, imports.%.a21 [concrete = constants.%empty_struct]
// CHECK:STDOUT: %foo.call: init %empty_tuple.type = call imports.%foo.decl()
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_todo_import_variadic.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %.c5d: type = cpp_overload_set_type @<null name> [concrete]
// CHECK:STDOUT: %empty_struct: %.c5d = struct_value () [concrete]
// CHECK:STDOUT: %int_8: Core.IntLiteral = int_value 8 [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .foo = %.a21
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %.a21: %.c5d = cpp_overload_set_value @<null name> [concrete = constants.%empty_struct]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %foo.ref: %.c5d = name_ref foo, imports.%.a21 [concrete = constants.%empty_struct]
// CHECK:STDOUT: %int_8: Core.IntLiteral = int_value 8 [concrete = constants.%int_8]
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- todo_fail_import_static.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %.c5d: type = cpp_overload_set_type @foo [concrete]
// CHECK:STDOUT: %empty_struct: %.c5d = struct_value () [concrete]
// CHECK:STDOUT: %foo.type: type = fn_type @foo [concrete]
// CHECK:STDOUT: %foo: %foo.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .foo = %.a21
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %.a21: %.c5d = cpp_overload_set_value @foo [concrete = constants.%empty_struct]
// CHECK:STDOUT: %foo.decl: %foo.type = fn_decl @foo [concrete = constants.%foo] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %foo.ref: %.c5d = name_ref foo, imports.%.a21 [concrete = constants.%empty_struct]
// CHECK:STDOUT: %foo.call: init %empty_tuple.type = call imports.%foo.decl()
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- import_template_function.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %.c5d: type = cpp_overload_set_type @Core.IntLiteral.as.As.impl.Convert [concrete]
// CHECK:STDOUT: %empty_struct.109: %.c5d = struct_value () [concrete]
// CHECK:STDOUT: %int_1.5b8: Core.IntLiteral = int_value 1 [concrete]
// CHECK:STDOUT: %int_32: Core.IntLiteral = int_value 32 [concrete]
// CHECK:STDOUT: %i32: type = class_type @Int, @Int(%int_32) [concrete]
// CHECK:STDOUT: %As.type.dbd: type = facet_type <@As, @As(%i32)> [concrete]
// CHECK:STDOUT: %As.Convert.type.99b: type = fn_type @As.Convert, @As(%i32) [concrete]
// CHECK:STDOUT: %To: Core.IntLiteral = bind_symbolic_name To, 0 [symbolic]
// CHECK:STDOUT: %Core.IntLiteral.as.As.impl.Convert.type.565: type = fn_type @Core.IntLiteral.as.As.impl.Convert, @Core.IntLiteral.as.As.impl(%To) [symbolic]
// CHECK:STDOUT: %Core.IntLiteral.as.As.impl.Convert.d2c: %Core.IntLiteral.as.As.impl.Convert.type.565 = struct_value () [symbolic]
// CHECK:STDOUT: %As.impl_witness.080: <witness> = impl_witness imports.%As.impl_witness_table.5ad, @Core.IntLiteral.as.As.impl(%int_32) [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.As.impl.Convert.type.aaf: type = fn_type @Core.IntLiteral.as.As.impl.Convert, @Core.IntLiteral.as.As.impl(%int_32) [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.As.impl.Convert.414: %Core.IntLiteral.as.As.impl.Convert.type.aaf = struct_value () [concrete]
// CHECK:STDOUT: %As.facet: %As.type.dbd = facet_value Core.IntLiteral, (%As.impl_witness.080) [concrete]
// CHECK:STDOUT: %.351: type = fn_type_with_self_type %As.Convert.type.99b, %As.facet [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.As.impl.Convert.bound: <bound method> = bound_method %int_1.5b8, %Core.IntLiteral.as.As.impl.Convert.414 [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.As.impl.Convert.specific_fn: <specific function> = specific_function %Core.IntLiteral.as.As.impl.Convert.414, @Core.IntLiteral.as.As.impl.Convert(%int_32) [concrete]
// CHECK:STDOUT: %bound_method: <bound method> = bound_method %int_1.5b8, %Core.IntLiteral.as.As.impl.Convert.specific_fn [concrete]
// CHECK:STDOUT: %int_1.5d2: %i32 = int_value 1 [concrete]
// CHECK:STDOUT: %foo.type: type = fn_type @foo [concrete]
// CHECK:STDOUT: %foo: %foo.type = struct_value () [concrete]
// CHECK:STDOUT: %.414: type = cpp_overload_set_type @Int.as.As.impl.Convert [concrete]
// CHECK:STDOUT: %empty_struct.540: %.414 = struct_value () [concrete]
// CHECK:STDOUT: %bar.type: type = fn_type @bar [concrete]
// CHECK:STDOUT: %bar: %bar.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .foo = %.a21
// CHECK:STDOUT: .bar = %.146
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %.a21: %.c5d = cpp_overload_set_value @Core.IntLiteral.as.As.impl.Convert [concrete = constants.%empty_struct.109]
// CHECK:STDOUT: %Core.import_ref.99c: @Core.IntLiteral.as.As.impl.%Core.IntLiteral.as.As.impl.Convert.type (%Core.IntLiteral.as.As.impl.Convert.type.565) = import_ref Core//prelude/parts/int, loc32_39, loaded [symbolic = @Core.IntLiteral.as.As.impl.%Core.IntLiteral.as.As.impl.Convert (constants.%Core.IntLiteral.as.As.impl.Convert.d2c)]
// CHECK:STDOUT: %As.impl_witness_table.5ad = impl_witness_table (%Core.import_ref.99c), @Core.IntLiteral.as.As.impl [concrete]
// CHECK:STDOUT: %foo.decl: %foo.type = fn_decl @foo [concrete = constants.%foo] {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: } {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT: %.146: %.414 = cpp_overload_set_value @Int.as.As.impl.Convert [concrete = constants.%empty_struct.540]
// CHECK:STDOUT: %bar.decl: %bar.type = fn_decl @bar [concrete = constants.%bar] {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: } {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %foo.ref: %.c5d = name_ref foo, imports.%.a21 [concrete = constants.%empty_struct.109]
// CHECK:STDOUT: %int_1: Core.IntLiteral = int_value 1 [concrete = constants.%int_1.5b8]
// CHECK:STDOUT: %int_32: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
// CHECK:STDOUT: %i32: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
// CHECK:STDOUT: %impl.elem0: %.351 = impl_witness_access constants.%As.impl_witness.080, element0 [concrete = constants.%Core.IntLiteral.as.As.impl.Convert.414]
// CHECK:STDOUT: %bound_method.loc8_13.1: <bound method> = bound_method %int_1, %impl.elem0 [concrete = constants.%Core.IntLiteral.as.As.impl.Convert.bound]
// CHECK:STDOUT: %specific_fn: <specific function> = specific_function %impl.elem0, @Core.IntLiteral.as.As.impl.Convert(constants.%int_32) [concrete = constants.%Core.IntLiteral.as.As.impl.Convert.specific_fn]
// CHECK:STDOUT: %bound_method.loc8_13.2: <bound method> = bound_method %int_1, %specific_fn [concrete = constants.%bound_method]
// CHECK:STDOUT: %Core.IntLiteral.as.As.impl.Convert.call: init %i32 = call %bound_method.loc8_13.2(%int_1) [concrete = constants.%int_1.5d2]
// CHECK:STDOUT: %.loc8_13.1: %i32 = value_of_initializer %Core.IntLiteral.as.As.impl.Convert.call [concrete = constants.%int_1.5d2]
// CHECK:STDOUT: %.loc8_13.2: %i32 = converted %int_1, %.loc8_13.1 [concrete = constants.%int_1.5d2]
// CHECK:STDOUT: %foo.call: init %empty_tuple.type = call imports.%foo.decl(%.loc8_13.2)
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @G() -> %i32 {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %bar.ref: %.414 = name_ref bar, imports.%.146 [concrete = constants.%empty_struct.540]
// CHECK:STDOUT: %int_1: Core.IntLiteral = int_value 1 [concrete = constants.%int_1.5b8]
// CHECK:STDOUT: %int_32.loc14: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
// CHECK:STDOUT: %i32.loc14: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
// CHECK:STDOUT: %impl.elem0: %.351 = impl_witness_access constants.%As.impl_witness.080, element0 [concrete = constants.%Core.IntLiteral.as.As.impl.Convert.414]
// CHECK:STDOUT: %bound_method.loc14_20.1: <bound method> = bound_method %int_1, %impl.elem0 [concrete = constants.%Core.IntLiteral.as.As.impl.Convert.bound]
// CHECK:STDOUT: %specific_fn: <specific function> = specific_function %impl.elem0, @Core.IntLiteral.as.As.impl.Convert(constants.%int_32) [concrete = constants.%Core.IntLiteral.as.As.impl.Convert.specific_fn]
// CHECK:STDOUT: %bound_method.loc14_20.2: <bound method> = bound_method %int_1, %specific_fn [concrete = constants.%bound_method]
// CHECK:STDOUT: %Core.IntLiteral.as.As.impl.Convert.call: init %i32 = call %bound_method.loc14_20.2(%int_1) [concrete = constants.%int_1.5d2]
// CHECK:STDOUT: %.loc14_20.1: %i32 = value_of_initializer %Core.IntLiteral.as.As.impl.Convert.call [concrete = constants.%int_1.5d2]
// CHECK:STDOUT: %.loc14_20.2: %i32 = converted %int_1, %.loc14_20.1 [concrete = constants.%int_1.5d2]
// CHECK:STDOUT: %bar.call: init %i32 = call imports.%bar.decl(%.loc14_20.2)
// CHECK:STDOUT: return %bar.call to %return
// CHECK:STDOUT: }
// CHECK:STDOUT: