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33110d096cb0c089995dfbf5c1986d4d5c178dad
carbon-lang/toolchain/check/testdata/where_expr/non_generic.carbon
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josh11bJosh LRichard Smith
 33110d096c Facet types support rewrite (where .A =...) constraints (#4613) 
* Rewrite constraints are stored in a facet type, substituted, imported,
and formatted.
* We now distinguish `.Self` from other symbolic bindings in two ways:
* `.Self` itself now has an invalid compile time binding index (since it
doesn't bind to any of the generic parameters). As a result, we no
longer need to create a generic region in `handle_where.cpp`.
* There is a new phase tracking values that are only symbolic because
they transitively depend on `.Self`. This allows us to give the result
of a `where` expression template phase as long as it doesn't use any
symbolic constants other than `.Self` or other designators.
* `AddConstant` has been removed from `check/context` since it was only
used from `eval`. This meant less plumbing of the phase change.
* Evaluation of `BindSymbolicName` now also performs substitution into
its type.
* Include a bit more information in some diagnostics.
* `StringifyTypeExpr` outputs rewrites, which required adding support
for associated entities as well.
  * Associated entities now have an entity name set when importing.
* Adds tests for some interesting cases with rewrites and uses of
`.Self` mixed with other symbolic constants.

Still to do:
* There is no validation that any particular type satisfies rewrite
constraints.
  * Access to members of a facet type do not see the rewritten values.
* Impls don't recognize whether associated constants have rewrites
setting their values.
  * No support for resolving facet types.

---------

Co-authored-by: Josh L <josh11b@users.noreply.github.com>
Co-authored-by: Richard Smith <richard@metafoo.co.uk>
2024-12-03 22:44:39 +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
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/where_expr/non_generic.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/where_expr/non_generic.carbon
interface I { let T:! type; }
// Ensure that we don't crash when checking this `where` in a non-generic context.
fn NotGenericF(U: I where .T == i32) {}
// CHECK:STDOUT: --- non_generic.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %I.type: type = facet_type <@I> [template]
// CHECK:STDOUT: %Self: %I.type = bind_symbolic_name Self, 0 [symbolic]
// CHECK:STDOUT: %assoc_type: type = assoc_entity_type %I.type, type [template]
// CHECK:STDOUT: %assoc0: %assoc_type = assoc_entity element0, @I.%T [template]
// CHECK:STDOUT: %.Self: %I.type = bind_symbolic_name .Self [symbolic]
// CHECK:STDOUT: %.Self.as_wit: <witness> = facet_access_witness %.Self [symbolic]
// CHECK:STDOUT: %impl.elem0: type = interface_witness_access %.Self.as_wit, element0 [symbolic]
// CHECK:STDOUT: %int_32: Core.IntLiteral = int_value 32 [template]
// CHECK:STDOUT: %Int.type: type = fn_type @Int [template]
// CHECK:STDOUT: %Int: %Int.type = struct_value () [template]
// CHECK:STDOUT: %i32: type = int_type signed, %int_32 [template]
// CHECK:STDOUT: %I_where.type: type = facet_type <@I where TODO> [template]
// CHECK:STDOUT: %NotGenericF.type: type = fn_type @NotGenericF [template]
// CHECK:STDOUT: %NotGenericF: %NotGenericF.type = struct_value () [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [template] {
// CHECK:STDOUT: .Int = %import_ref
// CHECK:STDOUT: import Core//prelude
// CHECK:STDOUT: import Core//prelude/...
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [template] {
// CHECK:STDOUT: .Core = imports.%Core
// CHECK:STDOUT: .I = %I.decl
// CHECK:STDOUT: .NotGenericF = %NotGenericF.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.import = import Core
// CHECK:STDOUT: %I.decl: type = interface_decl @I [template = constants.%I.type] {} {}
// CHECK:STDOUT: %NotGenericF.decl: %NotGenericF.type = fn_decl @NotGenericF [template = constants.%NotGenericF] {
// CHECK:STDOUT: %U.patt: %I_where.type = binding_pattern U
// CHECK:STDOUT: %U.param_patt: %I_where.type = value_param_pattern %U.patt, runtime_param0
// CHECK:STDOUT: } {
// CHECK:STDOUT: %I.ref: type = name_ref I, file.%I.decl [template = constants.%I.type]
// CHECK:STDOUT: %.Self: %I.type = bind_symbolic_name .Self [symbolic = constants.%.Self]
// CHECK:STDOUT: %.Self.ref: %I.type = name_ref .Self, %.Self [symbolic = constants.%.Self]
// CHECK:STDOUT: %T.ref: %assoc_type = name_ref T, @I.%assoc0 [template = constants.%assoc0]
// CHECK:STDOUT: %.Self.as_wit: <witness> = facet_access_witness %.Self.ref [symbolic = constants.%.Self.as_wit]
// CHECK:STDOUT: %impl.elem0: type = interface_witness_access %.Self.as_wit, element0 [symbolic = constants.%impl.elem0]
// CHECK:STDOUT: %int_32: Core.IntLiteral = int_value 32 [template = constants.%int_32]
// CHECK:STDOUT: %int.make_type_signed: init type = call constants.%Int(%int_32) [template = constants.%i32]
// CHECK:STDOUT: %.loc14: type = where_expr %.Self [template = constants.%I_where.type] {
// CHECK:STDOUT: requirement_equivalent %impl.elem0, %int.make_type_signed
// CHECK:STDOUT: }
// CHECK:STDOUT: %U.param: %I_where.type = value_param runtime_param0
// CHECK:STDOUT: %U: %I_where.type = bind_name U, %U.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @I {
// CHECK:STDOUT: %Self: %I.type = bind_symbolic_name Self, 0 [symbolic = constants.%Self]
// CHECK:STDOUT: %T: type = assoc_const_decl T [template]
// CHECK:STDOUT: %assoc0: %assoc_type = assoc_entity element0, %T [template = constants.%assoc0]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = %Self
// CHECK:STDOUT: .T = %assoc0
// CHECK:STDOUT: witness = (%T)
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @NotGenericF(%U.param_patt: %I_where.type) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
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