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Improve diagnostics for overload resolution failure. (#6091)

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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>
This commit is contained in:
Richard Smith
2025-09-19 20:22:47 +00:00
committed by GitHub
co-authored by Jon Ross-Perkins
parent ef488f00fa
commit 925250f8f9
21 changed files with 443 additions and 349 deletions
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toolchain/check/testdata/interop/cpp/function/function.carbon
Vendored
+6 -7
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@@ -115,10 +115,7 @@ import Cpp library "variadic.h";
fn F() {
//@dump-sem-ir-begin
// CHECK:STDERR: fail_todo_import_variadic.carbon:[[@LINE+7]]:3: error: semantics TODO: `Unsupported: Variadic function` [SemanticsTodo]
// CHECK:STDERR: Cpp.foo(8);
// CHECK:STDERR: ^~~~~~~~~~
// CHECK:STDERR: fail_todo_import_variadic.carbon:[[@LINE+4]]:3: note: in call to Cpp function here [InCallToCppFunction]
// 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:
@@ -139,16 +136,18 @@ static auto foo() -> void;
library "[[@TEST_NAME]]";
// TODO: Promote this warning to an error by default.
// CHECK:STDERR: todo_fail_import_static.carbon:[[@LINE+5]]:10: in file included here [InCppInclude]
// 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: | ^
// CHECK:STDERR:
import Cpp library "static.h";
fn F() {
//@dump-sem-ir-begin
// TODO: Produce a note pointing here.
// 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
}