ec117158a3
Now in libcxx and clang, all the coroutine components are defined in std::experimental namespace. And now the coroutine TS is merged into C++20. So in the working draft like N4892, we could find the coroutine components is defined in std namespace instead of std::experimental namespace. And the coroutine support in clang seems to be relatively stable. So I think it may be suitable to move the coroutine component into the experiment namespace now. This patch would make clang lookup coroutine_traits in std namespace first. For the compatibility consideration, clang would lookup in std::experimental namespace if it can't find definitions in std namespace. So the existing codes wouldn't be break after update compiler. And in case the compiler found std::coroutine_traits and std::experimental::coroutine_traits at the same time, it would emit an error for it. The support for looking up std::experimental::coroutine_traits would be removed in Clang16. Reviewed By: lxfind, Quuxplusone Differential Revision: https://reviews.llvm.org/D108696
41 lines
1.5 KiB
C++
41 lines
1.5 KiB
C++
// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -std=c++20 -emit-llvm %s -o - -disable-llvm-passes | FileCheck %s
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#include "Inputs/coroutine.h"
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using namespace std;
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struct coro {
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struct promise_type {
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coro get_return_object();
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suspend_always initial_suspend();
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suspend_never final_suspend() noexcept;
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void return_void();
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static void unhandled_exception();
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};
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};
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extern "C" coro f(int) { co_return; }
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// Verify that cleanup.dest.slot is eliminated in a coroutine.
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// CHECK-LABEL: f(
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// CHECK: %[[INIT_SUSPEND:.+]] = call i8 @llvm.coro.suspend(
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// CHECK-NEXT: switch i8 %[[INIT_SUSPEND]], label
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// CHECK-NEXT: i8 0, label %[[INIT_READY:.+]]
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// CHECK-NEXT: i8 1, label %[[INIT_CLEANUP:.+]]
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// CHECK-NEXT: ]
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// CHECK: %[[CLEANUP_DEST0:.+]] = phi i32 [ 0, %[[INIT_READY]] ], [ 2, %[[INIT_CLEANUP]] ]
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// CHECK: %[[FINAL_SUSPEND:.+]] = call i8 @llvm.coro.suspend(
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// CHECK-NEXT: switch i8 %{{.*}}, label %coro.ret [
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// CHECK-NEXT: i8 0, label %[[FINAL_READY:.+]]
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// CHECK-NEXT: i8 1, label %[[FINAL_CLEANUP:.+]]
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// CHECK-NEXT: ]
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// CHECK: call void @_ZNSt13suspend_never12await_resumeEv(
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// CHECK: %[[CLEANUP_DEST1:.+]] = phi i32 [ 0, %[[FINAL_READY]] ], [ 2, %[[FINAL_CLEANUP]] ]
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// CHECK: %[[CLEANUP_DEST2:.+]] = phi i32 [ %[[CLEANUP_DEST0]], %{{.+}} ], [ %[[CLEANUP_DEST1]], %{{.+}} ], [ 0, %{{.+}} ]
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// CHECK: call i8* @llvm.coro.free(
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// CHECK: switch i32 %[[CLEANUP_DEST2]], label %{{.+}} [
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// CHECK-NEXT: i32 0
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// CHECK-NEXT: i32 2
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// CHECK-NEXT: ]
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