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https://github.com/carbon-language/carbon-lang.git
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Richard Smith
d60900cbeb
When returning a value from a function whose return type has a by-copy initializing representation, perform initialization like we do when the return type has an in-place initializing representation. This makes our SemIR representation more uniform, as the return expression will now always be an initializing expression rather than a value expression, but more importantly it means that attempts to return a non-copyable type by value now fail, even if the type has a by-copy initializing representation. This catches a bunch of places where we were returning a value of an unconstrained template parameter `T:! type`, which we were incorrectly allowing because we didn't notice it was not copyable. Unfortunately this then requires quite a few test updates. Like #6034, this exposes a lowering issue where lowering crashes when attempting to lower a specific copy operation for certain types; a couple more tests are temporarily disabled here. An upcoming PR dependent on this one will fix the issue and re-enable those tests.
56 lines
2.1 KiB
Plaintext
56 lines
2.1 KiB
Plaintext
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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// INCLUDE-FILE: toolchain/testing/testdata/min_prelude/primitives.carbon
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//
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// AUTOUPDATE
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// TIP: To test this file alone, run:
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// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/builtins/float/less.carbon
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// TIP: To dump output, run:
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// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/builtins/float/less.carbon
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// --- float_less.carbon
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fn Less(a: f64, b: f64) -> bool = "float.less";
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fn Negate(a: f64) -> f64 = "float.negate";
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class True {}
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class False {}
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fn F(true_: True, false_: False) {
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true_ as (if Less(1.0, 2.0) then True else False);
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false_ as (if Less(1.0, 1.0) then True else False);
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false_ as (if Less(1.0, 0.0) then True else False);
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true_ as (if Less(Negate(1.0), 0.0) then True else False);
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false_ as (if Less(0.0, Negate(1.0)) then True else False);
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}
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fn RuntimeCallIsValid(a: f64, b: f64) -> bool {
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//@dump-sem-ir-begin
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return Less(a, b);
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//@dump-sem-ir-end
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}
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// CHECK:STDOUT: --- float_less.carbon
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// CHECK:STDOUT:
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// CHECK:STDOUT: constants {
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// CHECK:STDOUT: %int_64: Core.IntLiteral = int_value 64 [concrete]
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// CHECK:STDOUT: %f64.d77: type = class_type @Float, @Float(%int_64) [concrete]
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// CHECK:STDOUT: %Less.type: type = fn_type @Less [concrete]
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// CHECK:STDOUT: %Less: %Less.type = struct_value () [concrete]
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: imports {
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: fn @RuntimeCallIsValid(%a.param: %f64.d77, %b.param: %f64.d77) -> bool {
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// CHECK:STDOUT: !entry:
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// CHECK:STDOUT: %Less.ref: %Less.type = name_ref Less, file.%Less.decl [concrete = constants.%Less]
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// CHECK:STDOUT: %a.ref: %f64.d77 = name_ref a, %a
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// CHECK:STDOUT: %b.ref: %f64.d77 = name_ref b, %b
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// CHECK:STDOUT: %Less.call: init bool = call %Less.ref(%a.ref, %b.ref)
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// CHECK:STDOUT: return %Less.call to %return
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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