2fbd254aa4
Summary: 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. But move the coroutine component into the std namespace may be an break change. So I planned to split this change into two patch. One in clang and other in libcxx. 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 and emit a warning in this case. So the existing codes wouldn't be break after update compiler. Test Plan: check-clang, check-libcxx Reviewed By: lxfind Differential Revision: https://reviews.llvm.org/D108696
108 lines
3.1 KiB
C++
108 lines
3.1 KiB
C++
// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -fcoroutines-ts -std=c++14 -fsyntax-only -ast-dump %s | FileCheck %s
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#include "Inputs/std-coroutine.h"
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using namespace std;
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struct Task {
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struct promise_type {
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Task get_return_object() noexcept {
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return Task{coroutine_handle<promise_type>::from_promise(*this)};
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}
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void return_void() noexcept {}
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struct final_awaiter {
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bool await_ready() noexcept { return false; }
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coroutine_handle<> await_suspend(coroutine_handle<promise_type> h) noexcept {
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h.destroy();
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return {};
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}
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void await_resume() noexcept {}
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};
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void unhandled_exception() noexcept {}
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final_awaiter final_suspend() noexcept { return {}; }
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suspend_always initial_suspend() noexcept { return {}; }
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template <typename Awaitable>
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auto await_transform(Awaitable &&awaitable) {
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return awaitable.co_viaIfAsync();
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}
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};
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using handle_t = coroutine_handle<promise_type>;
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class Awaiter {
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public:
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explicit Awaiter(handle_t coro) noexcept;
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Awaiter(Awaiter &&other) noexcept;
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Awaiter(const Awaiter &) = delete;
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~Awaiter();
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bool await_ready() noexcept { return false; }
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handle_t await_suspend(coroutine_handle<> continuation) noexcept;
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void await_resume();
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private:
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handle_t coro_;
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};
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Task(handle_t coro) noexcept : coro_(coro) {}
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handle_t coro_;
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Task(const Task &t) = delete;
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Task(Task &&t) noexcept;
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~Task();
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Task &operator=(Task t) noexcept;
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Awaiter co_viaIfAsync();
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};
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static Task foo() {
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co_return;
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}
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Task bar() {
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auto mode = 2;
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switch (mode) {
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case 1:
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co_await foo();
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break;
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case 2:
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co_await foo();
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break;
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default:
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break;
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}
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}
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// CHECK-LABEL: FunctionDecl {{.*}} bar 'Task ()'
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// CHECK: SwitchStmt
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// CHECK: CaseStmt
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// CHECK: ExprWithCleanups {{.*}} 'void'
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// CHECK-NEXT: CoawaitExpr
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// CHECK-NEXT: MaterializeTemporaryExpr {{.*}} 'Task::Awaiter':'Task::Awaiter'
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// CHECK: ExprWithCleanups {{.*}} 'bool'
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// CHECK-NEXT: CXXMemberCallExpr {{.*}} 'bool'
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// CHECK-NEXT: MemberExpr {{.*}} .await_ready
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// CHECK: CallExpr {{.*}} 'void'
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// CHECK-NEXT: ImplicitCastExpr {{.*}} 'void (*)(void *)'
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// CHECK-NEXT: DeclRefExpr {{.*}} '__builtin_coro_resume' 'void (void *)'
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// CHECK-NEXT: ExprWithCleanups {{.*}} 'void *'
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// CHECK: CaseStmt
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// CHECK: ExprWithCleanups {{.*}} 'void'
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// CHECK-NEXT: CoawaitExpr
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// CHECK-NEXT: MaterializeTemporaryExpr {{.*}} 'Task::Awaiter':'Task::Awaiter'
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// CHECK: ExprWithCleanups {{.*}} 'bool'
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// CHECK-NEXT: CXXMemberCallExpr {{.*}} 'bool'
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// CHECK-NEXT: MemberExpr {{.*}} .await_ready
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// CHECK: CallExpr {{.*}} 'void'
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// CHECK-NEXT: ImplicitCastExpr {{.*}} 'void (*)(void *)'
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// CHECK-NEXT: DeclRefExpr {{.*}} '__builtin_coro_resume' 'void (void *)'
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// CHECK-NEXT: ExprWithCleanups {{.*}} 'void *'
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