forked from OSchip/llvm-project
82 lines
3.1 KiB
C++
82 lines
3.1 KiB
C++
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// Test the behavior of http://wg21.link/P0664, a proposal to catch any
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// exceptions thrown after the initial suspend point of a coroutine by
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// executing the handler specified by the promise type's 'unhandled_exception'
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// member function.
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//
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// RUN: %clang_cc1 -std=c++14 -fcoroutines-ts \
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// RUN: -triple=x86_64-unknown-linux-gnu -emit-llvm -o - %s \
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// RUN: -fexceptions -fcxx-exceptions -disable-llvm-passes \
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// RUN: | FileCheck %s
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#include "Inputs/coroutine.h"
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namespace coro = std::experimental::coroutines_v1;
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struct throwing_awaitable {
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bool await_ready() { return true; }
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void await_suspend(coro::coroutine_handle<>) {}
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void await_resume() { throw 42; }
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};
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struct task {
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struct promise_type {
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task get_return_object() { return task{}; }
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auto initial_suspend() { return throwing_awaitable{}; }
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auto final_suspend() { return coro::suspend_never{}; }
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void return_void() {}
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void unhandled_exception() {}
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};
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};
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// CHECK-LABEL: define void @_Z1fv()
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task f() {
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// A variable RESUMETHREW is used to keep track of whether the body
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// of 'await_resume' threw an exception. Exceptions thrown in
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// 'await_resume' are unwound to RESUMELPAD.
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// CHECK: init.ready:
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// CHECK-NEXT: store i1 true, i1* %[[RESUMETHREW:.+]], align 1
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// CHECK-NEXT: invoke void @_ZN18throwing_awaitable12await_resumeEv
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// CHECK-NEXT: to label %[[RESUMECONT:.+]] unwind label %[[RESUMELPAD:.+]]
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// If 'await_resume' does not throw an exception, 'false' is stored in
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// variable RESUMETHREW.
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// CHECK: [[RESUMECONT]]:
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// CHECK-NEXT: store i1 false, i1* %[[RESUMETHREW]]
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// CHECK-NEXT: br label %[[RESUMETRYCONT:.+]]
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// 'unhandled_exception' is called for the exception thrown in
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// 'await_resume'. The variable RESUMETHREW is never set to false,
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// and a jump is made to RESUMETRYCONT.
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// CHECK: [[RESUMELPAD]]:
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// CHECK: br label %[[RESUMECATCH:.+]]
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// CHECK: [[RESUMECATCH]]:
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// CHECK: invoke void @_ZN4task12promise_type19unhandled_exceptionEv
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// CHECK-NEXT: to label %[[RESUMEENDCATCH:.+]] unwind label
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// CHECK: [[RESUMEENDCATCH]]:
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// CHECK-NEXT: invoke void @__cxa_end_catch()
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// CHECK-NEXT: to label %[[RESUMEENDCATCHCONT:.+]] unwind label
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// CHECK: [[RESUMEENDCATCHCONT]]:
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// CHECK-NEXT: br label %[[RESUMETRYCONT]]
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// The variable RESUMETHREW is loaded and if true, then 'await_resume'
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// threw an exception and the coroutine body is skipped, and the final
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// suspend is executed immediately. Otherwise, the coroutine body is
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// executed, and then the final suspend.
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// CHECK: [[RESUMETRYCONT]]:
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// CHECK-NEXT: %[[RESUMETHREWLOAD:.+]] = load i1, i1* %[[RESUMETHREW]]
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// CHECK-NEXT: br i1 %[[RESUMETHREWLOAD]], label %[[RESUMEDCONT:.+]], label %[[RESUMEDBODY:.+]]
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// CHECK: [[RESUMEDBODY]]:
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// CHECK: invoke void @_ZN4task12promise_type11return_voidEv
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// CHECK-NEXT: to label %[[REDUMEDBODYCONT:.+]] unwind label
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// CHECK: [[REDUMEDBODYCONT]]:
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// CHECK-NEXT: br label %[[COROFINAL:.+]]
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// CHECK: [[RESUMEDCONT]]:
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// CHECK-NEXT: br label %[[COROFINAL]]
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// CHECK: [[COROFINAL]]:
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// CHECK-NEXT: invoke void @_ZN4task12promise_type13final_suspendEv
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co_return;
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}
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