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carbon-lang/toolchain/check/testdata/interop/cpp/var/import/global.carbon
T
Geoff RomerandRichard Smith e023f75254 Implement thunking in terms of constant evaluation (#7332) 
The bulk of this change is changing most pattern insts to be `Always`
rather than `AlwaysUnique` constants, so that they can be wrapped in
`SpecificConstant`s to perform substitution. That then lets thunking
rely much more on `SpecificConstant` wrappers instead of deep-copying
the inst tree with modified types.

This approach to thunking should scale better, particularly as things
like form generics make function signatures more complex, because we can
leverage the existing support for constant evaluation and substitution.
Unfortunately, applying this approach to binding patterns will require
more work; see the TODO near the top of `thunk.cpp` for details.

---------

Co-authored-by: Richard Smith <richard@metafoo.co.uk>
2026-06-13 00:22:00 +00:00

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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/destroy.carbon
// EXTRA-ARGS: --dump-sem-ir-ranges=if-present
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/interop/cpp/var/import/global.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interop/cpp/var/import/global.carbon
// ============================================================================
// Global scope
// ============================================================================
// --- global_scope.h
class C {};
C global;
C* _Nonnull global_ptr = &global;
C& global_ref = global;
// --- import_global_scope.carbon
library "[[@TEST_NAME]]";
import Cpp library "global_scope.h";
fn MyF() {
let unused local: Cpp.C = Cpp.global;
let unused local_ptr: Cpp.C* = Cpp.global_ptr;
let unused local_ref: Cpp.C* = Cpp.global_ref;
}
// ============================================================================
// Unsupported global type
// ============================================================================
// --- unsupported_type.h
using UnusupportedType = _BitInt(23);
UnusupportedType global;
// --- fail_import_unsupported_type.carbon
library "[[@TEST_NAME]]";
// CHECK:STDERR: fail_import_unsupported_type.carbon:[[@LINE+4]]:10: in file included here [InCppInclude]
// CHECK:STDERR: ./unsupported_type.h:2:7: error: semantics TODO: `Unsupported: Type declaration: UnusupportedType` [SemanticsTodo]
// CHECK:STDERR: using UnusupportedType = _BitInt(23);
// CHECK:STDERR: ^
import Cpp library "unsupported_type.h";
fn MyF() {
// CHECK:STDERR: fail_import_unsupported_type.carbon:[[@LINE+11]]:21: note: in `Cpp` name lookup for `UnusupportedType` [InCppNameLookup]
// CHECK:STDERR: let unused local: Cpp.UnusupportedType = Cpp.global;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
// CHECK:STDERR: fail_import_unsupported_type.carbon:[[@LINE+7]]:44: error: semantics TODO: `Unsupported: var type: UnusupportedType` [SemanticsTodo]
// CHECK:STDERR: let unused local: Cpp.UnusupportedType = Cpp.global;
// CHECK:STDERR: ^~~~~~~~~~
// CHECK:STDERR: fail_import_unsupported_type.carbon:[[@LINE+4]]:44: note: in `Cpp` name lookup for `global` [InCppNameLookup]
// CHECK:STDERR: let unused local: Cpp.UnusupportedType = Cpp.global;
// CHECK:STDERR: ^~~~~~~~~~
// CHECK:STDERR:
let unused local: Cpp.UnusupportedType = Cpp.global;
}
// CHECK:STDOUT: --- import_global_scope.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %MyF.type: type = fn_type @MyF [concrete]
// CHECK:STDOUT: %MyF: %MyF.type = struct_value () [concrete]
// CHECK:STDOUT: %C: type = class_type @C [concrete]
// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [concrete]
// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete]
// CHECK:STDOUT: %pattern_type.bbc: type = pattern_type %C [concrete]
// CHECK:STDOUT: %local.patt: %pattern_type.bbc = value_binding_pattern local [concrete]
// CHECK:STDOUT: %global.patt: %pattern_type.bbc = ref_binding_pattern global [concrete]
// CHECK:STDOUT: %global.var_patt: %pattern_type.bbc = var_pattern %global.patt [concrete]
// CHECK:STDOUT: %ptr.0a2: type = ptr_type %C [concrete]
// CHECK:STDOUT: %pattern_type.8fa: type = pattern_type %ptr.0a2 [concrete]
// CHECK:STDOUT: %local_ptr.patt: %pattern_type.8fa = value_binding_pattern local_ptr [concrete]
// CHECK:STDOUT: %global_ptr.patt: %pattern_type.8fa = ref_binding_pattern global_ptr [concrete]
// CHECK:STDOUT: %global_ptr.var_patt: %pattern_type.8fa = var_pattern %global_ptr.patt [concrete]
// CHECK:STDOUT: %local_ref.patt: %pattern_type.8fa = value_binding_pattern local_ref [concrete]
// CHECK:STDOUT: %const: type = const_type %ptr.0a2 [concrete]
// CHECK:STDOUT: %pattern_type.635: type = pattern_type %const [concrete]
// CHECK:STDOUT: %global_ref.patt: %pattern_type.635 = ref_binding_pattern global_ref [concrete]
// CHECK:STDOUT: %global_ref.var_patt: %pattern_type.635 = var_pattern %global_ref.patt [concrete]
// CHECK:STDOUT: %global_ref.var: ref %ptr.0a2 = var imports.%global_ref.var_patt [concrete]
// CHECK:STDOUT: %addr: %ptr.0a2 = addr_of imports.%global.var [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [concrete] {
// CHECK:STDOUT: import Core//prelude
// CHECK:STDOUT: import Core//prelude/...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .C = %C.decl
// CHECK:STDOUT: .global = %global.var
// CHECK:STDOUT: .global_ptr = %global_ptr.var
// CHECK:STDOUT: .global_ref = %global_ref.var
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %C.decl: type = class_decl @C [concrete = constants.%C] {} {}
// CHECK:STDOUT: %global.patt: %pattern_type.bbc = ref_binding_pattern global [concrete = constants.%global.patt]
// CHECK:STDOUT: %global.var_patt: %pattern_type.bbc = var_pattern %global.patt [concrete = constants.%global.var_patt]
// CHECK:STDOUT: %global.var: ref %C = var %global.var_patt [concrete]
// CHECK:STDOUT: %global_ptr.patt: %pattern_type.8fa = ref_binding_pattern global_ptr [concrete = constants.%global_ptr.patt]
// CHECK:STDOUT: %global_ptr.var_patt: %pattern_type.8fa = var_pattern %global_ptr.patt [concrete = constants.%global_ptr.var_patt]
// CHECK:STDOUT: %global_ptr.var: ref %ptr.0a2 = var %global_ptr.var_patt [concrete]
// CHECK:STDOUT: %global_ref.patt: %pattern_type.635 = ref_binding_pattern global_ref [concrete = constants.%global_ref.patt]
// CHECK:STDOUT: %global_ref.var_patt: %pattern_type.635 = var_pattern %global_ref.patt [concrete = constants.%global_ref.var_patt]
// CHECK:STDOUT: %global_ref.var: ref %const = var %global_ref.var_patt [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .Core = imports.%Core
// CHECK:STDOUT: .Cpp = imports.%Cpp
// CHECK:STDOUT: .MyF = %MyF.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.import = import Core
// CHECK:STDOUT: %Cpp.import_cpp = import_cpp {
// CHECK:STDOUT: import Cpp "global_scope.h"
// CHECK:STDOUT: }
// CHECK:STDOUT: %MyF.decl: %MyF.type = fn_decl @MyF [concrete = constants.%MyF] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @C {
// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [concrete = constants.%empty_struct_type]
// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete = constants.%complete_type]
// CHECK:STDOUT: complete_type_witness = %complete_type
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @MyF() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %local.patt: %pattern_type.bbc = value_binding_pattern local [concrete = constants.%local.patt]
// CHECK:STDOUT: }
// CHECK:STDOUT: %Cpp.ref.loc7_29: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %global.ref: ref %C = name_ref global, imports.%global.var [concrete = imports.%global.var]
// CHECK:STDOUT: %.loc7_32: %C = acquire_value %global.ref
// CHECK:STDOUT: %.loc7_24: type = splice_block %C.ref.loc7 [concrete = constants.%C] {
// CHECK:STDOUT: %Cpp.ref.loc7_21: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %C.ref.loc7: type = name_ref C, imports.%C.decl [concrete = constants.%C]
// CHECK:STDOUT: }
// CHECK:STDOUT: %local: %C = value_binding local, %.loc7_32
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %local_ptr.patt: %pattern_type.8fa = value_binding_pattern local_ptr [concrete = constants.%local_ptr.patt]
// CHECK:STDOUT: }
// CHECK:STDOUT: %Cpp.ref.loc8_34: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %global_ptr.ref: ref %ptr.0a2 = name_ref global_ptr, imports.%global_ptr.var [concrete = imports.%global_ptr.var]
// CHECK:STDOUT: %.loc8_37: %ptr.0a2 = acquire_value %global_ptr.ref
// CHECK:STDOUT: %.loc8_30: type = splice_block %ptr.loc8 [concrete = constants.%ptr.0a2] {
// CHECK:STDOUT: %Cpp.ref.loc8_25: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %C.ref.loc8: type = name_ref C, imports.%C.decl [concrete = constants.%C]
// CHECK:STDOUT: %ptr.loc8: type = ptr_type %C.ref.loc8 [concrete = constants.%ptr.0a2]
// CHECK:STDOUT: }
// CHECK:STDOUT: %local_ptr: %ptr.0a2 = value_binding local_ptr, %.loc8_37
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %local_ref.patt: %pattern_type.8fa = value_binding_pattern local_ref [concrete = constants.%local_ref.patt]
// CHECK:STDOUT: }
// CHECK:STDOUT: %Cpp.ref.loc9_34: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %global_ref.ref: ref %const = name_ref global_ref, imports.%global_ref.var [concrete = imports.%global_ref.var]
// CHECK:STDOUT: %.loc9_37.1: ref %ptr.0a2 = as_compatible %global_ref.ref [concrete = constants.%global_ref.var]
// CHECK:STDOUT: %.loc9_37.2: ref %ptr.0a2 = converted %global_ref.ref, %.loc9_37.1 [concrete = constants.%global_ref.var]
// CHECK:STDOUT: %addr: %ptr.0a2 = addr_of imports.%global.var [concrete = constants.%addr]
// CHECK:STDOUT: %.loc9_37.3: %ptr.0a2 = acquire_value %.loc9_37.2 [concrete = constants.%addr]
// CHECK:STDOUT: %.loc9_30: type = splice_block %ptr.loc9 [concrete = constants.%ptr.0a2] {
// CHECK:STDOUT: %Cpp.ref.loc9_25: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %C.ref.loc9: type = name_ref C, imports.%C.decl [concrete = constants.%C]
// CHECK:STDOUT: %ptr.loc9: type = ptr_type %C.ref.loc9 [concrete = constants.%ptr.0a2]
// CHECK:STDOUT: }
// CHECK:STDOUT: %local_ref: %ptr.0a2 = value_binding local_ref, %.loc9_37.3
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_import_unsupported_type.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %MyF.type: type = fn_type @MyF [concrete]
// CHECK:STDOUT: %MyF: %MyF.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [concrete] {
// CHECK:STDOUT: import Core//prelude
// CHECK:STDOUT: import Core//prelude/...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .UnusupportedType = <error>
// CHECK:STDOUT: .global = <error>
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .Core = imports.%Core
// CHECK:STDOUT: .Cpp = imports.%Cpp
// CHECK:STDOUT: .MyF = %MyF.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.import = import Core
// CHECK:STDOUT: %Cpp.import_cpp = import_cpp {
// CHECK:STDOUT: import Cpp "unsupported_type.h"
// CHECK:STDOUT: }
// CHECK:STDOUT: %MyF.decl: %MyF.type = fn_decl @MyF [concrete = constants.%MyF] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @MyF() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %local.patt: <error> = value_binding_pattern local [concrete = <error>]
// CHECK:STDOUT: }
// CHECK:STDOUT: %Cpp.ref.loc22_44: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %global.ref: <error> = name_ref global, <error> [concrete = <error>]
// CHECK:STDOUT: %.1: <error> = splice_block <error> [concrete = <error>] {
// CHECK:STDOUT: %Cpp.ref.loc22_21: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %UnusupportedType.ref: <error> = name_ref UnusupportedType, <error> [concrete = <error>]
// CHECK:STDOUT: }
// CHECK:STDOUT: %local: <error> = value_binding local, <error> [concrete = <error>]
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
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