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Add a flag to build a single ASTContext shared across all compilations (#7567)

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Instead of building one Clang `ASTContext` per compilation, the
`--share-cpp-ast` flag causes us to build a single `ASTContext` and
share it across all contexts. One new abstraction is added: `CppDomain`
represents the Carbon-side view of a Clang AST that might be shared
across multiple `SemIR::File`s. This object owns the Clang instance and
the AST.

For now, we have no isolation between the C++ state exposed to different
Carbon compilations, and we have no multiplexing of generated LLVM IR
from C++ into different Carbon compilations, so the mode is not usable
yet. The plan is to keep it behind a flag until it's ready.

Assisted-by: Gemini via Antigravity
This commit is contained in:
Richard Smith
2026-07-28 00:19:40 +00:00
committed by GitHub
parent 4e77f9b6c8
commit 7d89ac98c7
25 changed files with 449 additions and 211 deletions
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toolchain/check/testdata/interop/cpp/function/import/function.carbon
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+5 -6
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@@ -129,23 +129,22 @@ fn F() {
// --- static.h
// TODO: Promote this warning to an error by default.
// CHECK:STDERR: ./static.h:[[@LINE+3]]:13: warning: function 'foo' has internal linkage but is not defined [CppInteropParseWarning]
// CHECK:STDERR: 6 | static auto foo() -> void;
// CHECK:STDERR: | ^
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: 12 | Cpp.foo();
// CHECK:STDERR: | ^
// CHECK:STDERR:
Cpp.foo();