mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-11-14 13:49:02 +00:00
Dana Jansens
24766e213e
When identifying a facet type, defer evaluation of LookupImplWitnesses by redirecting them to evaluate into IdentifiedWitness. Then the caller of identify will need to substitute the IdentifiedWitnesses, either with witnesses of their own, or with LookupImplWitness to cause a lookup operation. This allows: - An `impl as` on a named constraint can subst the witnesses in designators from the named constraint with a witness to the impl itself. This prevents them from looking for and finding some other overlapping impl. (This PR) - Impl lookup to collect rewrite/equality requirements from all named constraints and then use the impls it has already found to evaluate any designators in those requirements instead of performing impl lookup again (creating a cycle). (Done in https://github.com/carbon-language/carbon-lang/pull/7944) - Similarly, an `impl as` can collect impls and equality requirements from all named constraints and verify them correctly by replacing witnesses that should refer to the impl with the correct witness instead of performing a lookup and finding an overlapping impl. (Done in https://github.com/carbon-language/carbon-lang/pull/7937) - ImplWitnessAccess to be able to find rewrites from a named constraint, not just from the initial DeclaredFacetType. (TBD) To do this we need to introduce the concept of "identified" specifics. In order to identify a facet type, we must construct a specific for each require decl in a named constraint. These specifics will have IdentifiedWitnesses inside them, but their args would otherwise match a specific for the require decl constructed in another context. To avoid polluting the canonical specific namespace, we introduce a second namespace of specifics that are "identified" since they are created by identifying. As we have introduced a new global state that modifies eval behaviour, we must disable that state when resolving a specific (as per https://github.com/carbon-language/carbon-lang/pull/7923). But inside an "identified" specific, we preserve the behaviour so that the witnesses modified by identify (through SubstPeriodSelf or through evaluating a require specific) have their evaluation deferred.
244 lines
14 KiB
Plaintext
244 lines
14 KiB
Plaintext
// 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/stdlib/string_view.carbon
|
|
// TIP: To dump output, run:
|
|
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interop/cpp/stdlib/string_view.carbon
|
|
|
|
// --- string_view.h
|
|
|
|
namespace std {
|
|
using size_t = __SIZE_TYPE__;
|
|
|
|
inline namespace __1 {
|
|
template<typename T> struct char_traits {};
|
|
|
|
template<typename CharT, typename Traits = char_traits<CharT>>
|
|
class basic_string_view {
|
|
public:
|
|
basic_string_view() = default;
|
|
size_t size() const { return size_; }
|
|
|
|
constexpr bool starts_with(basic_string_view sv) const {
|
|
return false;
|
|
}
|
|
|
|
private:
|
|
const CharT* data_;
|
|
size_t size_;
|
|
};
|
|
|
|
using string_view = basic_string_view<char>;
|
|
}
|
|
}
|
|
|
|
auto Consume(std::string_view sv) -> void;
|
|
auto Produce() -> std::string_view;
|
|
|
|
struct DerivedFromStringView : std::string_view {};
|
|
|
|
// --- pass_and_return.carbon
|
|
|
|
library "[[@TEST_NAME]]";
|
|
|
|
import Cpp library "string_view.h";
|
|
|
|
//@dump-sem-ir-begin
|
|
fn F() {
|
|
Cpp.Consume("hello");
|
|
}
|
|
//@dump-sem-ir-end
|
|
|
|
//@dump-sem-ir-begin
|
|
fn G() -> str {
|
|
return Cpp.Produce();
|
|
}
|
|
//@dump-sem-ir-end
|
|
|
|
// --- call_base_method.carbon
|
|
|
|
library "[[@TEST_NAME]]";
|
|
|
|
import Cpp library "string_view.h";
|
|
|
|
//@dump-sem-ir-begin
|
|
fn StarstWith(a: str, b: str) -> bool {
|
|
return a.(Cpp.DerivedFromStringView.starts_with)(b);
|
|
}
|
|
//@dump-sem-ir-end
|
|
|
|
// CHECK:STDOUT: --- pass_and_return.carbon
|
|
// CHECK:STDOUT:
|
|
// CHECK:STDOUT: constants {
|
|
// CHECK:STDOUT: type: type = facet_type <type> [concrete]
|
|
// CHECK:STDOUT: %F.type: type = fn_type @F [concrete]
|
|
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
|
|
// CHECK:STDOUT: %F: %F.type = struct_value () [concrete]
|
|
// CHECK:STDOUT: %Consume.cpp_overload_set.type: type = cpp_overload_set_type @Consume.cpp_overload_set [concrete]
|
|
// CHECK:STDOUT: %Consume.cpp_overload_set.value: %Consume.cpp_overload_set.type = cpp_overload_set_value @Consume.cpp_overload_set [concrete]
|
|
// CHECK:STDOUT: %str.3d4: type = class_type @String [concrete]
|
|
// CHECK:STDOUT: %int_64: Core.IntLiteral = int_value 64 [concrete]
|
|
// CHECK:STDOUT: %u64: type = class_type @UInt, @UInt(%int_64) [concrete]
|
|
// CHECK:STDOUT: %int_8: Core.IntLiteral = int_value 8 [concrete]
|
|
// CHECK:STDOUT: %u8: type = class_type @UInt, @UInt(%int_8) [concrete]
|
|
// CHECK:STDOUT: %ptr.22f: type = ptr_type %u8 [concrete]
|
|
// CHECK:STDOUT: %str.5d7: %ptr.22f = string_literal "hello" [concrete]
|
|
// CHECK:STDOUT: %int_5: %u64 = int_value 5 [concrete]
|
|
// CHECK:STDOUT: %String.val: %str.3d4 = struct_value (%str.5d7, %int_5) [concrete]
|
|
// CHECK:STDOUT: %pattern_type.adf: type = pattern_type %str.3d4 [concrete]
|
|
// CHECK:STDOUT: %ptr.e6f: type = ptr_type %str.3d4 [concrete]
|
|
// CHECK:STDOUT: %Consume__carbon_thunk.type: type = fn_type @Consume__carbon_thunk [concrete]
|
|
// CHECK:STDOUT: %Consume__carbon_thunk: %Consume__carbon_thunk.type = struct_value () [concrete]
|
|
// CHECK:STDOUT: %.8e1: Core.Form = init_form %str.3d4 [concrete]
|
|
// CHECK:STDOUT: %return.param_patt.59a: %pattern_type.adf = out_param_pattern [concrete]
|
|
// CHECK:STDOUT: %return.patt.156: %pattern_type.adf = return_slot_pattern %return.param_patt.59a, %str.3d4 [concrete]
|
|
// CHECK:STDOUT: %G.type: type = fn_type @G [concrete]
|
|
// CHECK:STDOUT: %G: %G.type = struct_value () [concrete]
|
|
// CHECK:STDOUT: %Produce.cpp_overload_set.type: type = cpp_overload_set_type @Produce.cpp_overload_set [concrete]
|
|
// CHECK:STDOUT: %Produce.cpp_overload_set.value: %Produce.cpp_overload_set.type = cpp_overload_set_value @Produce.cpp_overload_set [concrete]
|
|
// CHECK:STDOUT: %Produce__carbon_thunk.type: type = fn_type @Produce__carbon_thunk [concrete]
|
|
// CHECK:STDOUT: %Produce__carbon_thunk: %Produce__carbon_thunk.type = struct_value () [concrete]
|
|
// CHECK:STDOUT: }
|
|
// CHECK:STDOUT:
|
|
// CHECK:STDOUT: imports {
|
|
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
|
|
// CHECK:STDOUT: .Consume = %Consume.cpp_overload_set.value
|
|
// CHECK:STDOUT: .Produce = %Produce.cpp_overload_set.value
|
|
// CHECK:STDOUT: import Cpp//...
|
|
// CHECK:STDOUT: }
|
|
// CHECK:STDOUT: %Consume.cpp_overload_set.value: %Consume.cpp_overload_set.type = cpp_overload_set_value @Consume.cpp_overload_set [concrete = constants.%Consume.cpp_overload_set.value]
|
|
// CHECK:STDOUT: %Consume__carbon_thunk.decl: %Consume__carbon_thunk.type = fn_decl @Consume__carbon_thunk [concrete = constants.%Consume__carbon_thunk] {
|
|
// CHECK:STDOUT: <elided>
|
|
// CHECK:STDOUT: } {
|
|
// CHECK:STDOUT: <elided>
|
|
// CHECK:STDOUT: }
|
|
// CHECK:STDOUT: %Produce.cpp_overload_set.value: %Produce.cpp_overload_set.type = cpp_overload_set_value @Produce.cpp_overload_set [concrete = constants.%Produce.cpp_overload_set.value]
|
|
// CHECK:STDOUT: %Produce__carbon_thunk.decl: %Produce__carbon_thunk.type = fn_decl @Produce__carbon_thunk [concrete = constants.%Produce__carbon_thunk] {
|
|
// CHECK:STDOUT: <elided>
|
|
// CHECK:STDOUT: } {
|
|
// CHECK:STDOUT: <elided>
|
|
// CHECK:STDOUT: }
|
|
// CHECK:STDOUT: }
|
|
// CHECK:STDOUT:
|
|
// CHECK:STDOUT: file {
|
|
// CHECK:STDOUT: %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {} {}
|
|
// CHECK:STDOUT: %G.decl: %G.type = fn_decl @G [concrete = constants.%G] {
|
|
// CHECK:STDOUT: %return.param_patt: %pattern_type.adf = out_param_pattern [concrete = constants.%return.param_patt.59a]
|
|
// CHECK:STDOUT: %return.patt: %pattern_type.adf = return_slot_pattern %return.param_patt, %str [concrete = constants.%return.patt.156]
|
|
// CHECK:STDOUT: } {
|
|
// CHECK:STDOUT: %str: type = type_literal constants.%str.3d4 [concrete = constants.%str.3d4]
|
|
// CHECK:STDOUT: %.loc13_11.2: Core.Form = init_form %str [concrete = constants.%.8e1]
|
|
// CHECK:STDOUT: %return.param: ref %str.3d4 = out_param call_param0
|
|
// CHECK:STDOUT: %return: ref %str.3d4 = return_slot %return.param
|
|
// 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: %Consume.ref: %Consume.cpp_overload_set.type = name_ref Consume, imports.%Consume.cpp_overload_set.value [concrete = constants.%Consume.cpp_overload_set.value]
|
|
// CHECK:STDOUT: %str: %ptr.22f = string_literal "hello" [concrete = constants.%str.5d7]
|
|
// CHECK:STDOUT: %int_5: %u64 = int_value 5 [concrete = constants.%int_5]
|
|
// CHECK:STDOUT: %String.val: %str.3d4 = struct_value (%str, %int_5) [concrete = constants.%String.val]
|
|
// CHECK:STDOUT: %.loc8: ref %str.3d4 = value_as_ref %String.val
|
|
// CHECK:STDOUT: %addr: %ptr.e6f = addr_of %.loc8
|
|
// CHECK:STDOUT: %Consume__carbon_thunk.call: init %empty_tuple.type = call imports.%Consume__carbon_thunk.decl(%addr)
|
|
// CHECK:STDOUT: return
|
|
// CHECK:STDOUT: }
|
|
// CHECK:STDOUT:
|
|
// CHECK:STDOUT: fn @G() -> out %return.param: %str.3d4 {
|
|
// CHECK:STDOUT: !entry:
|
|
// CHECK:STDOUT: %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
|
|
// CHECK:STDOUT: %Produce.ref: %Produce.cpp_overload_set.type = name_ref Produce, imports.%Produce.cpp_overload_set.value [concrete = constants.%Produce.cpp_overload_set.value]
|
|
// CHECK:STDOUT: %.loc13_11.1: ref %str.3d4 = splice_block %return.param {}
|
|
// CHECK:STDOUT: %addr: %ptr.e6f = addr_of %.loc13_11.1
|
|
// CHECK:STDOUT: %Produce__carbon_thunk.call: init %empty_tuple.type = call imports.%Produce__carbon_thunk.decl(%addr)
|
|
// CHECK:STDOUT: %.loc14: init %str.3d4 to %.loc13_11.1 = mark_in_place_init %Produce__carbon_thunk.call
|
|
// CHECK:STDOUT: return %.loc14 to %return.param
|
|
// CHECK:STDOUT: }
|
|
// CHECK:STDOUT:
|
|
// CHECK:STDOUT: --- call_base_method.carbon
|
|
// CHECK:STDOUT:
|
|
// CHECK:STDOUT: constants {
|
|
// CHECK:STDOUT: type: type = facet_type <type> [concrete]
|
|
// CHECK:STDOUT: %str: type = class_type @String [concrete]
|
|
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
|
|
// CHECK:STDOUT: %pattern_type.adf: type = pattern_type %str [concrete]
|
|
// CHECK:STDOUT: %a.param_patt: %pattern_type.adf = value_param_pattern [concrete]
|
|
// CHECK:STDOUT: %a.patt: %pattern_type.adf = wrapper_binding_pattern a, %a.param_patt [concrete]
|
|
// CHECK:STDOUT: %b.param_patt: %pattern_type.adf = value_param_pattern [concrete]
|
|
// CHECK:STDOUT: %b.patt: %pattern_type.adf = wrapper_binding_pattern b, %b.param_patt [concrete]
|
|
// CHECK:STDOUT: %.f34: Core.Form = init_form bool [concrete]
|
|
// CHECK:STDOUT: %pattern_type.831: type = pattern_type bool [concrete]
|
|
// CHECK:STDOUT: %return.param_patt.5a1: %pattern_type.831 = out_param_pattern [concrete]
|
|
// CHECK:STDOUT: %return.patt.c0c: %pattern_type.831 = return_slot_pattern %return.param_patt.5a1, bool [concrete]
|
|
// CHECK:STDOUT: %StarstWith.type: type = fn_type @StarstWith [concrete]
|
|
// CHECK:STDOUT: %StarstWith: %StarstWith.type = struct_value () [concrete]
|
|
// CHECK:STDOUT: %DerivedFromStringView: type = class_type @DerivedFromStringView [concrete]
|
|
// CHECK:STDOUT: %DerivedFromStringView.starts_with.cpp_overload_set.type: type = cpp_overload_set_type @DerivedFromStringView.starts_with.cpp_overload_set [concrete]
|
|
// CHECK:STDOUT: %DerivedFromStringView.starts_with.cpp_overload_set.value: %DerivedFromStringView.starts_with.cpp_overload_set.type = cpp_overload_set_value @DerivedFromStringView.starts_with.cpp_overload_set [concrete]
|
|
// CHECK:STDOUT: %ptr.e6f: type = ptr_type %str [concrete]
|
|
// CHECK:STDOUT: %ptr.bb2: type = ptr_type bool [concrete]
|
|
// CHECK:STDOUT: %starts_with__carbon_thunk.type: type = fn_type @starts_with__carbon_thunk [concrete]
|
|
// CHECK:STDOUT: %starts_with__carbon_thunk: %starts_with__carbon_thunk.type = struct_value () [concrete]
|
|
// CHECK:STDOUT: }
|
|
// CHECK:STDOUT:
|
|
// CHECK:STDOUT: imports {
|
|
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
|
|
// CHECK:STDOUT: .DerivedFromStringView = %DerivedFromStringView.decl
|
|
// CHECK:STDOUT: import Cpp//...
|
|
// CHECK:STDOUT: }
|
|
// CHECK:STDOUT: %DerivedFromStringView.decl: type = class_decl @DerivedFromStringView [concrete = constants.%DerivedFromStringView] {} {}
|
|
// CHECK:STDOUT: %DerivedFromStringView.starts_with.cpp_overload_set.value: %DerivedFromStringView.starts_with.cpp_overload_set.type = cpp_overload_set_value @DerivedFromStringView.starts_with.cpp_overload_set [concrete = constants.%DerivedFromStringView.starts_with.cpp_overload_set.value]
|
|
// CHECK:STDOUT: %starts_with__carbon_thunk.decl: %starts_with__carbon_thunk.type = fn_decl @starts_with__carbon_thunk [concrete = constants.%starts_with__carbon_thunk] {
|
|
// CHECK:STDOUT: <elided>
|
|
// CHECK:STDOUT: } {
|
|
// CHECK:STDOUT: <elided>
|
|
// CHECK:STDOUT: }
|
|
// CHECK:STDOUT: }
|
|
// CHECK:STDOUT:
|
|
// CHECK:STDOUT: file {
|
|
// CHECK:STDOUT: %StarstWith.decl: %StarstWith.type = fn_decl @StarstWith [concrete = constants.%StarstWith] {
|
|
// CHECK:STDOUT: %a.param_patt: %pattern_type.adf = value_param_pattern [concrete = constants.%a.param_patt]
|
|
// CHECK:STDOUT: %a.patt: %pattern_type.adf = wrapper_binding_pattern a, %a.param_patt [concrete = constants.%a.patt]
|
|
// CHECK:STDOUT: %b.param_patt: %pattern_type.adf = value_param_pattern [concrete = constants.%b.param_patt]
|
|
// CHECK:STDOUT: %b.patt: %pattern_type.adf = wrapper_binding_pattern b, %b.param_patt [concrete = constants.%b.patt]
|
|
// CHECK:STDOUT: %return.param_patt: %pattern_type.831 = out_param_pattern [concrete = constants.%return.param_patt.5a1]
|
|
// CHECK:STDOUT: %return.patt: %pattern_type.831 = return_slot_pattern %return.param_patt, %.loc7_34.1 [concrete = constants.%return.patt.c0c]
|
|
// CHECK:STDOUT: } {
|
|
// CHECK:STDOUT: %.loc7_34.1: type = type_literal bool [concrete = bool]
|
|
// CHECK:STDOUT: %.loc7_34.2: Core.Form = init_form %.loc7_34.1 [concrete = constants.%.f34]
|
|
// CHECK:STDOUT: %a.param: %str = value_param call_param0
|
|
// CHECK:STDOUT: %str.loc7_18: type = type_literal constants.%str [concrete = constants.%str]
|
|
// CHECK:STDOUT: %a: %str = wrapper_binding a, %a.param
|
|
// CHECK:STDOUT: %b.param: %str = value_param call_param1
|
|
// CHECK:STDOUT: %str.loc7_26: type = type_literal constants.%str [concrete = constants.%str]
|
|
// CHECK:STDOUT: %b: %str = wrapper_binding b, %b.param
|
|
// CHECK:STDOUT: %return.param: ref bool = out_param call_param2
|
|
// CHECK:STDOUT: %return: ref bool = return_slot %return.param
|
|
// CHECK:STDOUT: }
|
|
// CHECK:STDOUT: }
|
|
// CHECK:STDOUT:
|
|
// CHECK:STDOUT: fn @StarstWith(%a.param: %str, %b.param: %str) -> out %return.param: bool {
|
|
// CHECK:STDOUT: !entry:
|
|
// CHECK:STDOUT: %a.ref: %str = name_ref a, %a
|
|
// CHECK:STDOUT: %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
|
|
// CHECK:STDOUT: %DerivedFromStringView.ref: type = name_ref DerivedFromStringView, imports.%DerivedFromStringView.decl [concrete = constants.%DerivedFromStringView]
|
|
// CHECK:STDOUT: %starts_with.ref: %DerivedFromStringView.starts_with.cpp_overload_set.type = name_ref starts_with, imports.%DerivedFromStringView.starts_with.cpp_overload_set.value [concrete = constants.%DerivedFromStringView.starts_with.cpp_overload_set.value]
|
|
// CHECK:STDOUT: %bound_method: <bound method> = bound_method %a.ref, %starts_with.ref
|
|
// CHECK:STDOUT: %b.ref: %str = name_ref b, %b
|
|
// CHECK:STDOUT: %.loc8_52: ref %str = value_as_ref %b.ref
|
|
// CHECK:STDOUT: %addr.loc8_53.1: %ptr.e6f = addr_of %.loc8_52
|
|
// CHECK:STDOUT: %.loc8_53.1: ref bool = temporary_storage
|
|
// CHECK:STDOUT: %addr.loc8_53.2: %ptr.bb2 = addr_of %.loc8_53.1
|
|
// CHECK:STDOUT: %starts_with__carbon_thunk.call: init %empty_tuple.type = call imports.%starts_with__carbon_thunk.decl(%a.ref, %addr.loc8_53.1, %addr.loc8_53.2)
|
|
// CHECK:STDOUT: %.loc8_53.2: init bool to %.loc8_53.1 = mark_in_place_init %starts_with__carbon_thunk.call
|
|
// CHECK:STDOUT: return %.loc8_53.2
|
|
// CHECK:STDOUT: }
|
|
// CHECK:STDOUT:
|