mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-10-03 21:25:54 +01:00
Richard Smith
703529fc55
Instead of tracking the cleanup scope depth on entry to each scope, track an "ambient" cleanup scope depth that's *after* the destructors of local variables in that scope. This gets increased to include the destructors of local variables when we create a name-binding declaration. Then, when we reach a point where temporaries should be destroyed, run cleanups that are after the ambient cleanup scope depth on the stack. This happens: * At the `;` of a statement expression. * At the `)` of an `if` or `while` statement. * After performing the implied `HasValue()` call in a `for` statement. Per informal agreement with leads, this means we lifetime-extend all temporaries created in the initializer of a name-binding declaration to the full scope of that declaration, but that temporaries created in an expression statement are destroyed at the `;`.
82 lines
3.3 KiB
Plaintext
82 lines
3.3 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/bool.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/while/lifetime.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/while/lifetime.carbon
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// --- condition_lifetime.carbon
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library "[[@TEST_NAME]]";
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class A {
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fn F() -> bool;
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}
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fn Make() -> A;
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fn G();
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fn F() {
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//@dump-sem-ir-begin
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// The temporary A object is destroyed before the branch.
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while (Make().F()) {
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G();
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}
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//@dump-sem-ir-end
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}
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// CHECK:STDOUT: --- condition_lifetime.carbon
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// CHECK:STDOUT:
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// CHECK:STDOUT: constants {
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// CHECK:STDOUT: %A: type = class_type @A [concrete]
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// CHECK:STDOUT: %A.F.type: type = fn_type @A.F [concrete]
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// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
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// CHECK:STDOUT: %A.F: %A.F.type = struct_value () [concrete]
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// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [concrete]
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// CHECK:STDOUT: %Make.type: type = fn_type @Make [concrete]
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// CHECK:STDOUT: %Make: %Make.type = struct_value () [concrete]
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// CHECK:STDOUT: %G.type: type = fn_type @G [concrete]
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// CHECK:STDOUT: %G: %G.type = struct_value () [concrete]
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// CHECK:STDOUT: %Destroy.Op.type.1d8f74.2: type = fn_type @Destroy.Op.loc14_15.2 [concrete]
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// CHECK:STDOUT: %Destroy.Op.1a2547.2: %Destroy.Op.type.1d8f74.2 = struct_value () [concrete]
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: fn @F() {
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// CHECK:STDOUT: !entry:
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// CHECK:STDOUT: br !while.cond
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// CHECK:STDOUT:
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// CHECK:STDOUT: !while.cond:
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// CHECK:STDOUT: %Make.ref: %Make.type = name_ref Make, file.%Make.decl [concrete = constants.%Make]
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// CHECK:STDOUT: %.loc14_15.1: ref %A = temporary_storage
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// CHECK:STDOUT: %Make.call: init %A to %.loc14_15.1 = call %Make.ref()
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// CHECK:STDOUT: %.loc14_15.2: ref %A = temporary %.loc14_15.1, %Make.call
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// CHECK:STDOUT: %F.ref: %A.F.type = name_ref F, @A.%A.F.decl [concrete = constants.%A.F]
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// CHECK:STDOUT: %A.F.call: init bool = call %F.ref()
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// CHECK:STDOUT: %.loc14_20.1: bool = value_of_initializer %A.F.call
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// CHECK:STDOUT: %.loc14_20.2: bool = converted %A.F.call, %.loc14_20.1
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// CHECK:STDOUT: %Destroy.Op.bound: <bound method> = bound_method %.loc14_15.2, constants.%Destroy.Op.1a2547.2
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// CHECK:STDOUT: %Destroy.Op.call: init %empty_tuple.type = call %Destroy.Op.bound(%.loc14_15.2)
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// CHECK:STDOUT: if %.loc14_20.2 br !while.body else br !while.done
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// CHECK:STDOUT:
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// CHECK:STDOUT: !while.body:
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// CHECK:STDOUT: %G.ref: %G.type = name_ref G, file.%G.decl [concrete = constants.%G]
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// CHECK:STDOUT: %G.call: init %empty_tuple.type = call %G.ref()
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// CHECK:STDOUT: br !while.cond
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// CHECK:STDOUT:
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// CHECK:STDOUT: !while.done:
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// CHECK:STDOUT: <elided>
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: fn @Destroy.Op.loc14_15.1(%self.param: ref %empty_struct_type) = "no_op";
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// CHECK:STDOUT:
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// CHECK:STDOUT: fn @Destroy.Op.loc14_15.2(%self.param: ref %A) {
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// CHECK:STDOUT: !entry:
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// CHECK:STDOUT: return
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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