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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/export/thunk_ast.carbon
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@@ -12,6 +12,7 @@
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interop/cpp/function/export/thunk_ast.carbon
// CHECK:STDOUT: TranslationUnitDecl {{0x[a-f0-9]+}} <<invalid sloc>> <invalid sloc>
// CHECK:STDOUT: |-EmptyDecl {{0x[a-f0-9]+}} <<carbon Cpp imports>:1:1> col:1
// CHECK:STDOUT: |-NamespaceDecl {{0x[a-f0-9]+}} <<invalid sloc>> <invalid sloc> referenced Carbon external-linkage
// --- thunk_with_args_and_return.carbon