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carbon-lang/toolchain/check/testdata/if_expr/fail_partial_constant.carbon
T
Richard Smith 5b884ae14d Improve lowering for global variables. (#5492) 
- Track the `VarPattern` instruction on the `VarStorage` instruction so
that it's available for name mangling.
- Mangle global variables based on the first binding name within their
pattern.
- Give global variables external rather than internal linkage, except if
they have no bindings whatsoever in their pattern.
- To support lowering references to bindings nested within a global var,
such as for `var (x: i32, b: i32)`, add some basic initial support for
reference constant expressions. Treat a global `var` as a reference
constant, and treat an aggregate access into a reference constant as a
reference constant.
2025-05-21 00:09:10 +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/if_expr/fail_partial_constant.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/if_expr/fail_partial_constant.carbon
// --- fail_non_constant_condition.carbon
package NonConstantCondition;
fn ConditionIsNonConstant(b: bool) {
// We choose to not accept this even if both arms evaluate to the same
// constant value, because it notionally involves evaluating a non-constant
// condition.
// CHECK:STDERR: fail_non_constant_condition.carbon:[[@LINE+4]]:10: error: cannot evaluate type expression [TypeExprEvaluationFailure]
// CHECK:STDERR: var v: if b then i32 else i32 = 1;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
var v: if b then i32 else i32 = 1;
}
// --- fail_non_constant_result.carbon
package NonConstantResult;
fn ChosenBranchIsNonConstant(t: type) {
// CHECK:STDERR: fail_non_constant_result.carbon:[[@LINE+4]]:10: error: cannot evaluate type expression [TypeExprEvaluationFailure]
// CHECK:STDERR: var v: if true then t else i32 = 1;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
var v: if true then t else i32 = 1;
// CHECK:STDERR: fail_non_constant_result.carbon:[[@LINE+4]]:10: error: cannot evaluate type expression [TypeExprEvaluationFailure]
// CHECK:STDERR: var w: if false then i32 else t = 1;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
var w: if false then i32 else t = 1;
}
// CHECK:STDOUT: --- fail_non_constant_condition.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %Bool.type: type = fn_type @Bool [concrete]
// CHECK:STDOUT: %Bool: %Bool.type = struct_value () [concrete]
// CHECK:STDOUT: %pattern_type.831: type = pattern_type bool [concrete]
// CHECK:STDOUT: %ConditionIsNonConstant.type: type = fn_type @ConditionIsNonConstant [concrete]
// CHECK:STDOUT: %ConditionIsNonConstant: %ConditionIsNonConstant.type = struct_value () [concrete]
// CHECK:STDOUT: %int_32: Core.IntLiteral = int_value 32 [concrete]
// CHECK:STDOUT: %Int.type: type = generic_class_type @Int [concrete]
// CHECK:STDOUT: %Int.generic: %Int.type = struct_value () [concrete]
// CHECK:STDOUT: %i32: type = class_type @Int, @Int(%int_32) [concrete]
// CHECK:STDOUT: %int_1: Core.IntLiteral = int_value 1 [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [concrete] {
// CHECK:STDOUT: .Bool = %Core.Bool
// CHECK:STDOUT: .Int = %Core.Int
// CHECK:STDOUT: import Core//prelude
// CHECK:STDOUT: import Core//prelude/...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.Bool: %Bool.type = import_ref Core//prelude/types/bool, Bool, loaded [concrete = constants.%Bool]
// CHECK:STDOUT: %Core.Int: %Int.type = import_ref Core//prelude/types/int, Int, loaded [concrete = constants.%Int.generic]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .Core = imports.%Core
// CHECK:STDOUT: .ConditionIsNonConstant = %ConditionIsNonConstant.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.import = import Core
// CHECK:STDOUT: %ConditionIsNonConstant.decl: %ConditionIsNonConstant.type = fn_decl @ConditionIsNonConstant [concrete = constants.%ConditionIsNonConstant] {
// CHECK:STDOUT: %b.patt: %pattern_type.831 = binding_pattern b [concrete]
// CHECK:STDOUT: %b.param_patt: %pattern_type.831 = value_param_pattern %b.patt, call_param0 [concrete]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %b.param: bool = value_param call_param0
// CHECK:STDOUT: %.loc4_30.1: type = splice_block %.loc4_30.3 [concrete = bool] {
// CHECK:STDOUT: %bool.make_type: init type = call constants.%Bool() [concrete = bool]
// CHECK:STDOUT: %.loc4_30.2: type = value_of_initializer %bool.make_type [concrete = bool]
// CHECK:STDOUT: %.loc4_30.3: type = converted %bool.make_type, %.loc4_30.2 [concrete = bool]
// CHECK:STDOUT: }
// CHECK:STDOUT: %b: bool = bind_name b, %b.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @ConditionIsNonConstant(%b.param: bool) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %v.patt: <error> = binding_pattern v [concrete]
// CHECK:STDOUT: %v.var_patt: <error> = var_pattern %v.patt [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %v.var: ref <error> = var %v.var_patt [concrete = <error>]
// CHECK:STDOUT: %int_1: Core.IntLiteral = int_value 1 [concrete = constants.%int_1]
// CHECK:STDOUT: assign %v.var, <error>
// CHECK:STDOUT: br !.loc12_13
// CHECK:STDOUT:
// CHECK:STDOUT: !.loc12_13:
// CHECK:STDOUT: %b.ref: bool = name_ref b, %b
// CHECK:STDOUT: if %b.ref br !if.expr.then else br !if.expr.else
// CHECK:STDOUT:
// CHECK:STDOUT: !if.expr.then:
// CHECK:STDOUT: %int_32.loc12_20: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
// CHECK:STDOUT: %i32.loc12_20: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
// CHECK:STDOUT: br !if.expr.result(%i32.loc12_20)
// CHECK:STDOUT:
// CHECK:STDOUT: !if.expr.else:
// CHECK:STDOUT: %int_32.loc12_29: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
// CHECK:STDOUT: %i32.loc12_29: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
// CHECK:STDOUT: br !if.expr.result(%i32.loc12_29)
// CHECK:STDOUT:
// CHECK:STDOUT: !if.expr.result:
// CHECK:STDOUT: %.loc12: type = block_arg !if.expr.result
// CHECK:STDOUT: br !.loc12_7
// CHECK:STDOUT:
// CHECK:STDOUT: !.loc12_7:
// CHECK:STDOUT: %v: <error> = bind_name v, <error>
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_non_constant_result.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %pattern_type.98f: type = pattern_type type [concrete]
// CHECK:STDOUT: %ChosenBranchIsNonConstant.type: type = fn_type @ChosenBranchIsNonConstant [concrete]
// CHECK:STDOUT: %ChosenBranchIsNonConstant: %ChosenBranchIsNonConstant.type = struct_value () [concrete]
// CHECK:STDOUT: %true: bool = bool_literal true [concrete]
// CHECK:STDOUT: %int_32: Core.IntLiteral = int_value 32 [concrete]
// CHECK:STDOUT: %Int.type: type = generic_class_type @Int [concrete]
// CHECK:STDOUT: %Int.generic: %Int.type = struct_value () [concrete]
// CHECK:STDOUT: %i32: type = class_type @Int, @Int(%int_32) [concrete]
// CHECK:STDOUT: %int_1: Core.IntLiteral = int_value 1 [concrete]
// CHECK:STDOUT: %false: bool = bool_literal false [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [concrete] {
// CHECK:STDOUT: .Int = %Core.Int
// CHECK:STDOUT: import Core//prelude
// CHECK:STDOUT: import Core//prelude/...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.Int: %Int.type = import_ref Core//prelude/types/int, Int, loaded [concrete = constants.%Int.generic]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .Core = imports.%Core
// CHECK:STDOUT: .ChosenBranchIsNonConstant = %ChosenBranchIsNonConstant.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.import = import Core
// CHECK:STDOUT: %ChosenBranchIsNonConstant.decl: %ChosenBranchIsNonConstant.type = fn_decl @ChosenBranchIsNonConstant [concrete = constants.%ChosenBranchIsNonConstant] {
// CHECK:STDOUT: %t.patt: %pattern_type.98f = binding_pattern t [concrete]
// CHECK:STDOUT: %t.param_patt: %pattern_type.98f = value_param_pattern %t.patt, call_param0 [concrete]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %t.param: type = value_param call_param0
// CHECK:STDOUT: %t: type = bind_name t, %t.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @ChosenBranchIsNonConstant(%t.param: type) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %v.patt: <error> = binding_pattern v [concrete]
// CHECK:STDOUT: %v.var_patt: <error> = var_pattern %v.patt [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %v.var: ref <error> = var %v.var_patt [concrete = <error>]
// CHECK:STDOUT: %int_1.loc9: Core.IntLiteral = int_value 1 [concrete = constants.%int_1]
// CHECK:STDOUT: assign %v.var, <error>
// CHECK:STDOUT: br !.loc9_13
// CHECK:STDOUT:
// CHECK:STDOUT: !.loc9_13:
// CHECK:STDOUT: %true: bool = bool_literal true [concrete = constants.%true]
// CHECK:STDOUT: if %true br !if.expr.then.loc9 else br !if.expr.else.loc9
// CHECK:STDOUT:
// CHECK:STDOUT: !if.expr.then.loc9:
// CHECK:STDOUT: %t.ref.loc9: type = name_ref t, %t
// CHECK:STDOUT: br !if.expr.result.loc9(%t.ref.loc9)
// CHECK:STDOUT:
// CHECK:STDOUT: !if.expr.else.loc9:
// CHECK:STDOUT: %int_32.loc9: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
// CHECK:STDOUT: %i32.loc9: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
// CHECK:STDOUT: br !if.expr.result.loc9(%i32.loc9)
// CHECK:STDOUT:
// CHECK:STDOUT: !if.expr.result.loc9:
// CHECK:STDOUT: %.loc9: type = block_arg !if.expr.result.loc9
// CHECK:STDOUT: br !.loc9_7
// CHECK:STDOUT:
// CHECK:STDOUT: !.loc9_7:
// CHECK:STDOUT: %v: <error> = bind_name v, <error>
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %w.patt: <error> = binding_pattern w [concrete]
// CHECK:STDOUT: %w.var_patt: <error> = var_pattern %w.patt [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %w.var: ref <error> = var %w.var_patt [concrete = <error>]
// CHECK:STDOUT: %int_1.loc14: Core.IntLiteral = int_value 1 [concrete = constants.%int_1]
// CHECK:STDOUT: assign %w.var, <error>
// CHECK:STDOUT: br !.loc14_13
// CHECK:STDOUT:
// CHECK:STDOUT: !.loc14_13:
// CHECK:STDOUT: %false: bool = bool_literal false [concrete = constants.%false]
// CHECK:STDOUT: if %false br !if.expr.then.loc14 else br !if.expr.else.loc14
// CHECK:STDOUT:
// CHECK:STDOUT: !if.expr.then.loc14:
// CHECK:STDOUT: %int_32.loc14: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
// CHECK:STDOUT: %i32.loc14: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
// CHECK:STDOUT: br !if.expr.result.loc14(%i32.loc14)
// CHECK:STDOUT:
// CHECK:STDOUT: !if.expr.else.loc14:
// CHECK:STDOUT: %t.ref.loc14: type = name_ref t, %t
// CHECK:STDOUT: br !if.expr.result.loc14(%t.ref.loc14)
// CHECK:STDOUT:
// CHECK:STDOUT: !if.expr.result.loc14:
// CHECK:STDOUT: %.loc14: type = block_arg !if.expr.result.loc14
// CHECK:STDOUT: br !.loc14_7
// CHECK:STDOUT:
// CHECK:STDOUT: !.loc14_7:
// CHECK:STDOUT: %w: <error> = bind_name w, <error>
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
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