r298565 - [coroutines] Implement unhandled_exception changes.

Eric Fiselier via cfe-commits cfe-commits at lists.llvm.org
Wed Mar 22 17:33:33 PDT 2017


Author: ericwf
Date: Wed Mar 22 19:33:33 2017
New Revision: 298565

URL: http://llvm.org/viewvc/llvm-project?rev=298565&view=rev
Log:
[coroutines] Implement unhandled_exception changes.

Summary:
This patch adopts the recent changes that renamed `set_exception(exception_pointer)` to `unhandled_exception()`. 

Additionally `unhandled_exception()` is now required, and so an error is emitted when exceptions are enabled but the promise type does not provide the member.
When exceptions are disabled a warning is emitted instead of an error, The warning notes that the `unhandled_exception()` function is required when exceptions are enabled.

Reviewers: rsmith, GorNishanov, aaron.ballman, majnemer

Reviewed By: GorNishanov

Subscribers: mehdi_amini, cfe-commits

Differential Revision: https://reviews.llvm.org/D30859

Added:
    cfe/trunk/test/SemaCXX/Inputs/std-coroutine.h
    cfe/trunk/test/SemaCXX/coroutine-unhandled_exception-warning.cpp
Modified:
    cfe/trunk/include/clang/Basic/DiagnosticGroups.td
    cfe/trunk/include/clang/Basic/DiagnosticSemaKinds.td
    cfe/trunk/lib/Sema/SemaCoroutine.cpp
    cfe/trunk/test/SemaCXX/coreturn.cpp
    cfe/trunk/test/SemaCXX/coroutines.cpp

Modified: cfe/trunk/include/clang/Basic/DiagnosticGroups.td
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/include/clang/Basic/DiagnosticGroups.td?rev=298565&r1=298564&r2=298565&view=diff
==============================================================================
--- cfe/trunk/include/clang/Basic/DiagnosticGroups.td (original)
+++ cfe/trunk/include/clang/Basic/DiagnosticGroups.td Wed Mar 22 19:33:33 2017
@@ -36,6 +36,7 @@ def GNUCompoundLiteralInitializer : Diag
 def BitFieldConstantConversion : DiagGroup<"bitfield-constant-conversion">;
 def BitFieldEnumConversion : DiagGroup<"bitfield-enum-conversion">;
 def BitFieldWidth : DiagGroup<"bitfield-width">;
+def Coroutine : DiagGroup<"coroutine">;
 def ConstantConversion :
   DiagGroup<"constant-conversion", [ BitFieldConstantConversion ] >;
 def LiteralConversion : DiagGroup<"literal-conversion">;

Modified: cfe/trunk/include/clang/Basic/DiagnosticSemaKinds.td
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/include/clang/Basic/DiagnosticSemaKinds.td?rev=298565&r1=298564&r2=298565&view=diff
==============================================================================
--- cfe/trunk/include/clang/Basic/DiagnosticSemaKinds.td (original)
+++ cfe/trunk/include/clang/Basic/DiagnosticSemaKinds.td Wed Mar 22 19:33:33 2017
@@ -8865,11 +8865,6 @@ def err_coroutine_promise_type_incomplet
 def err_coroutine_type_missing_specialization : Error<
   "this function cannot be a coroutine: missing definition of "
   "specialization %q0">;
-def err_implied_std_current_exception_not_found : Error<
-  "you need to include <exception> before defining a coroutine that implicitly "
-  "uses 'set_exception'">;
-def err_malformed_std_current_exception : Error<
-  "'std::current_exception' must be a function">;
 def err_coroutine_promise_return_ill_formed : Error<
   "%0 declares both 'return_value' and 'return_void'">;
 def note_coroutine_promise_implicit_await_transform_required_here : Note<
@@ -8877,6 +8872,11 @@ def note_coroutine_promise_implicit_awai
 def note_coroutine_promise_call_implicitly_required : Note<
   "call to '%select{initial_suspend|final_suspend}0' implicitly "
   "required by the %select{initial suspend point|final suspend point}0">;
+def err_coroutine_promise_unhandled_exception_required : Error<
+  "%0 is required to declare the member 'unhandled_exception()'">;
+def warn_coroutine_promise_unhandled_exception_required_with_exceptions : Warning<
+  "%0 is required to declare the member 'unhandled_exception()' when exceptions are enabled">,
+  InGroup<Coroutine>;
 }
 
 let CategoryName = "Documentation Issue" in {

Modified: cfe/trunk/lib/Sema/SemaCoroutine.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Sema/SemaCoroutine.cpp?rev=298565&r1=298564&r2=298565&view=diff
==============================================================================
--- cfe/trunk/lib/Sema/SemaCoroutine.cpp (original)
+++ cfe/trunk/lib/Sema/SemaCoroutine.cpp Wed Mar 22 19:33:33 2017
@@ -658,34 +658,6 @@ StmtResult Sema::BuildCoreturnStmt(Sourc
   return Res;
 }
 
-static ExprResult buildStdCurrentExceptionCall(Sema &S, SourceLocation Loc) {
-  NamespaceDecl *Std = S.getStdNamespace();
-  if (!Std) {
-    S.Diag(Loc, diag::err_implied_std_current_exception_not_found);
-    return ExprError();
-  }
-  LookupResult Result(S, &S.PP.getIdentifierTable().get("current_exception"),
-                      Loc, Sema::LookupOrdinaryName);
-  if (!S.LookupQualifiedName(Result, Std)) {
-    S.Diag(Loc, diag::err_implied_std_current_exception_not_found);
-    return ExprError();
-  }
-
-  // FIXME The STL is free to provide more than one overload.
-  FunctionDecl *FD = Result.getAsSingle<FunctionDecl>();
-  if (!FD) {
-    S.Diag(Loc, diag::err_malformed_std_current_exception);
-    return ExprError();
-  }
-  ExprResult Res = S.BuildDeclRefExpr(FD, FD->getType(), VK_LValue, Loc);
-  Res = S.ActOnCallExpr(/*Scope*/ nullptr, Res.get(), Loc, None, Loc);
-  if (Res.isInvalid()) {
-    S.Diag(Loc, diag::err_malformed_std_current_exception);
-    return ExprError();
-  }
-  return Res;
-}
-
 // Find an appropriate delete for the promise.
 static FunctionDecl *findDeleteForPromise(Sema &S, SourceLocation Loc,
                                           QualType PromiseType) {
@@ -913,36 +885,34 @@ bool SubStmtBuilder::makeOnFallthrough()
 }
 
 bool SubStmtBuilder::makeOnException() {
-  // Try to form 'p.set_exception(std::current_exception());' to handle
-  // uncaught exceptions.
-  // TODO: Post WG21 Issaquah 2016 renamed set_exception to unhandled_exception
-  // TODO: and dropped exception_ptr parameter. Make it so.
+  // Try to form 'p.unhandled_exception();'
 
   if (!PromiseRecordDecl)
     return true;
 
+  const bool RequireUnhandledException = S.getLangOpts().CXXExceptions;
+
+  if (!lookupMember(S, "unhandled_exception", PromiseRecordDecl, Loc)) {
+    auto DiagID =
+        RequireUnhandledException
+            ? diag::err_coroutine_promise_unhandled_exception_required
+            : diag::
+                  warn_coroutine_promise_unhandled_exception_required_with_exceptions;
+    S.Diag(Loc, DiagID) << PromiseRecordDecl;
+    return !RequireUnhandledException;
+  }
+
   // If exceptions are disabled, don't try to build OnException.
   if (!S.getLangOpts().CXXExceptions)
     return true;
 
-  ExprResult SetException;
-
-  // [dcl.fct.def.coroutine]/3
-  // The unqualified-id set_exception is found in the scope of P by class
-  // member access lookup (3.4.5).
-  if (lookupMember(S, "set_exception", PromiseRecordDecl, Loc)) {
-    // Form the call 'p.set_exception(std::current_exception())'
-    SetException = buildStdCurrentExceptionCall(S, Loc);
-    if (SetException.isInvalid())
-      return false;
-    Expr *E = SetException.get();
-    SetException = buildPromiseCall(S, Fn.CoroutinePromise, Loc, "set_exception", E);
-    SetException = S.ActOnFinishFullExpr(SetException.get(), Loc);
-    if (SetException.isInvalid())
-      return false;
-  }
+  ExprResult UnhandledException = buildPromiseCall(S, Fn.CoroutinePromise, Loc,
+                                                   "unhandled_exception", None);
+  UnhandledException = S.ActOnFinishFullExpr(UnhandledException.get(), Loc);
+  if (UnhandledException.isInvalid())
+    return false;
 
-  this->OnException = SetException.get();
+  this->OnException = UnhandledException.get();
   return true;
 }
 

Added: cfe/trunk/test/SemaCXX/Inputs/std-coroutine.h
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaCXX/Inputs/std-coroutine.h?rev=298565&view=auto
==============================================================================
--- cfe/trunk/test/SemaCXX/Inputs/std-coroutine.h (added)
+++ cfe/trunk/test/SemaCXX/Inputs/std-coroutine.h Wed Mar 22 19:33:33 2017
@@ -0,0 +1,37 @@
+// RUN: %clang_cc1 -triple x86_64-apple-darwin9 %s -std=c++14 -fcoroutines-ts -fsyntax-only -Wignored-qualifiers -Wno-error=return-type -verify -fblocks -Wno-unreachable-code -Wno-unused-value
+#ifndef STD_COROUTINE_H
+#define STD_COROUTINE_H
+
+namespace std {
+namespace experimental {
+
+template <class Ret, typename... T>
+struct coroutine_traits { using promise_type = typename Ret::promise_type; };
+
+template <class Promise = void>
+struct coroutine_handle {
+  static coroutine_handle from_address(void *);
+};
+template <>
+struct coroutine_handle<void> {
+  template <class PromiseType>
+  coroutine_handle(coroutine_handle<PromiseType>);
+  static coroutine_handle from_address(void *);
+};
+
+struct suspend_always {
+  bool await_ready() { return false; }
+  void await_suspend(coroutine_handle<>) {}
+  void await_resume() {}
+};
+
+struct suspend_never {
+  bool await_ready() { return true; }
+  void await_suspend(coroutine_handle<>) {}
+  void await_resume() {}
+};
+
+} // namespace experimental
+} // namespace std
+
+#endif // STD_COROUTINE_H

Modified: cfe/trunk/test/SemaCXX/coreturn.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaCXX/coreturn.cpp?rev=298565&r1=298564&r2=298565&view=diff
==============================================================================
--- cfe/trunk/test/SemaCXX/coreturn.cpp (original)
+++ cfe/trunk/test/SemaCXX/coreturn.cpp Wed Mar 22 19:33:33 2017
@@ -1,24 +1,8 @@
 // RUN: %clang_cc1 -triple x86_64-apple-darwin9 %s -std=c++14 -fcoroutines-ts -fsyntax-only -Wignored-qualifiers -Wno-error=return-type -verify -fblocks -Wno-unreachable-code -Wno-unused-value
+#include "Inputs/std-coroutine.h"
 
-namespace std {
-namespace experimental {
-
-template <class Ret, typename... T>
-struct coroutine_traits { using promise_type = typename Ret::promise_type; };
-
-template <class Promise = void>
-struct coroutine_handle {
-  static coroutine_handle from_address(void *);
-};
-template <>
-struct coroutine_handle<void> {
-  template <class PromiseType>
-  coroutine_handle(coroutine_handle<PromiseType>);
-  static coroutine_handle from_address(void *);
-};
-
-}
-}
+using std::experimental::suspend_always;
+using std::experimental::suspend_never;
 
 struct awaitable {
   bool await_ready();
@@ -26,23 +10,12 @@ struct awaitable {
   void await_resume();
 } a;
 
-struct suspend_always {
-  bool await_ready() { return false; }
-  void await_suspend(std::experimental::coroutine_handle<>) {}
-  void await_resume() {}
-};
-
-struct suspend_never {
-  bool await_ready() { return true; }
-  void await_suspend(std::experimental::coroutine_handle<>) {}
-  void await_resume() {}
-};
-
 struct promise_void {
   void get_return_object();
   suspend_always initial_suspend();
   suspend_always final_suspend();
   void return_void();
+  void unhandled_exception();
 };
 
 struct promise_float {
@@ -50,6 +23,7 @@ struct promise_float {
   suspend_always initial_suspend();
   suspend_always final_suspend();
   void return_void();
+  void unhandled_exception();
 };
 
 struct promise_int {
@@ -57,6 +31,7 @@ struct promise_int {
   suspend_always initial_suspend();
   suspend_always final_suspend();
   void return_value(int);
+  void unhandled_exception();
 };
 
 template <typename... T>

Added: cfe/trunk/test/SemaCXX/coroutine-unhandled_exception-warning.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaCXX/coroutine-unhandled_exception-warning.cpp?rev=298565&view=auto
==============================================================================
--- cfe/trunk/test/SemaCXX/coroutine-unhandled_exception-warning.cpp (added)
+++ cfe/trunk/test/SemaCXX/coroutine-unhandled_exception-warning.cpp Wed Mar 22 19:33:33 2017
@@ -0,0 +1,24 @@
+// RUN: %clang_cc1 -triple x86_64-apple-darwin9 %s -std=c++14 -fcoroutines-ts -fsyntax-only -Wignored-qualifiers -Wno-error=return-type -verify -fblocks -Wno-unreachable-code -Wno-unused-value
+
+#if __has_feature(cxx_exceptions)
+#error This test requires exceptions be disabled
+#endif
+
+#include "Inputs/std-coroutine.h"
+
+using std::experimental::suspend_always;
+using std::experimental::suspend_never;
+
+struct promise_void {
+  void get_return_object();
+  suspend_always initial_suspend();
+  suspend_always final_suspend();
+  void return_void();
+};
+
+template <typename... T>
+struct std::experimental::coroutine_traits<void, T...> { using promise_type = promise_void; };
+
+void test0() { // expected-warning {{'promise_void' is required to declare the member 'unhandled_exception()' when exceptions are enabled}}
+  co_return;
+}

Modified: cfe/trunk/test/SemaCXX/coroutines.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaCXX/coroutines.cpp?rev=298565&r1=298564&r2=298565&view=diff
==============================================================================
--- cfe/trunk/test/SemaCXX/coroutines.cpp (original)
+++ cfe/trunk/test/SemaCXX/coroutines.cpp Wed Mar 22 19:33:33 2017
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -std=c++14 -fcoroutines-ts -verify %s -fcxx-exceptions
+// RUN: %clang_cc1 -std=c++14 -fcoroutines-ts -verify %s -fcxx-exceptions -fexceptions
 
 void no_coroutine_traits_bad_arg_await() {
   co_await a; // expected-error {{include <experimental/coroutine>}}
@@ -101,6 +101,7 @@ struct promise {
   awaitable yield_value(yielded_thing); // expected-note 2{{candidate}}
   not_awaitable yield_value(void()); // expected-note 2{{candidate}}
   void return_value(int); // expected-note 2{{here}}
+  void unhandled_exception();
 };
 
 struct promise_void {
@@ -108,6 +109,7 @@ struct promise_void {
   suspend_always initial_suspend();
   suspend_always final_suspend();
   void return_void();
+  void unhandled_exception();
 };
 
 void no_coroutine_handle() { // expected-error {{std::experimental::coroutine_handle type was not found; include <experimental/coroutine> before defining a coroutine}}
@@ -344,6 +346,7 @@ namespace dependent_operator_co_await_lo
     transformed initial_suspend();
     ::adl_ns::coawait_arg_type final_suspend();
     transformed await_transform(transform_awaitable);
+    void unhandled_exception();
   };
   template <class AwaitArg>
   struct basic_promise {
@@ -351,6 +354,7 @@ namespace dependent_operator_co_await_lo
     coro<basic_promise> get_return_object();
     awaitable initial_suspend();
     awaitable final_suspend();
+    void unhandled_exception();
   };
 
   awaitable operator co_await(await_arg_1);
@@ -435,6 +439,7 @@ struct std::experimental::coroutine_trai
     suspend_never initial_suspend();
     suspend_never final_suspend();
     void get_return_object();
+    void unhandled_exception();
   };
 };
 
@@ -467,6 +472,7 @@ namespace placeholder {
 struct bad_promise_1 {
   suspend_always initial_suspend();
   suspend_always final_suspend();
+  void unhandled_exception();
 };
 coro<bad_promise_1> missing_get_return_object() { // expected-error {{no member named 'get_return_object' in 'bad_promise_1'}}
   co_await a;
@@ -476,6 +482,7 @@ struct bad_promise_2 {
   coro<bad_promise_2> get_return_object();
   // FIXME: We shouldn't offer a typo-correction here!
   suspend_always final_suspend(); // expected-note {{here}}
+  void unhandled_exception();
 };
 // FIXME: This shouldn't happen twice
 coro<bad_promise_2> missing_initial_suspend() { // expected-error {{no member named 'initial_suspend' in 'bad_promise_2'}}
@@ -486,6 +493,7 @@ struct bad_promise_3 {
   coro<bad_promise_3> get_return_object();
   // FIXME: We shouldn't offer a typo-correction here!
   suspend_always initial_suspend(); // expected-note {{here}}
+  void unhandled_exception();
 };
 coro<bad_promise_3> missing_final_suspend() { // expected-error {{no member named 'final_suspend' in 'bad_promise_3'}}
   co_await a;
@@ -517,6 +525,7 @@ struct bad_promise_6 {
   coro<bad_promise_6> get_return_object();
   suspend_always initial_suspend();
   suspend_always final_suspend();
+  void unhandled_exception();
   void return_void();
   void return_value(int) const;
   void return_value(int);
@@ -530,17 +539,11 @@ struct bad_promise_7 {
   suspend_always initial_suspend();
   suspend_always final_suspend();
   void return_void();
-  void set_exception(int *);
 };
-coro<bad_promise_7> no_std_current_exc() {
-  // expected-error at -1 {{you need to include <exception> before defining a coroutine that implicitly uses 'set_exception'}}
+coro<bad_promise_7> no_unhandled_exception() { // expected-error {{'bad_promise_7' is required to declare the member 'unhandled_exception()'}}
   co_await a;
 }
 
-namespace std {
-int *current_exception();
-}
-
 struct bad_promise_base {
 private:
   void return_void();
@@ -549,14 +552,14 @@ struct bad_promise_8 : bad_promise_base
   coro<bad_promise_8> get_return_object();
   suspend_always initial_suspend();
   suspend_always final_suspend();
-  void set_exception();                                   // expected-note {{function not viable}}
-  void set_exception(int *) __attribute__((unavailable)); // expected-note {{explicitly made unavailable}}
-  void set_exception(void *);                             // expected-note {{candidate function}}
+  void unhandled_exception() __attribute__((unavailable)); // expected-note {{made unavailable}}
+  void unhandled_exception() const;                        // expected-note {{candidate}}
+  void unhandled_exception(void *) const;                  // expected-note {{requires 1 argument, but 0 were provided}}
 };
-coro<bad_promise_8> calls_set_exception() {
-  // expected-error at -1 {{call to unavailable member function 'set_exception'}}
+coro<bad_promise_8> calls_unhandled_exception() {
+  // expected-error at -1 {{call to unavailable member function 'unhandled_exception'}}
   // FIXME: also warn about private 'return_void' here. Even though building
-  // the call to set_exception has already failed.
+  // the call to unhandled_exception has already failed.
   co_await a;
 }
 
@@ -567,6 +570,7 @@ struct bad_promise_9 {
   void await_transform(void *);                                // expected-note {{candidate}}
   awaitable await_transform(int) __attribute__((unavailable)); // expected-note {{explicitly made unavailable}}
   void return_void();
+  void unhandled_exception();
 };
 coro<bad_promise_9> calls_await_transform() {
   co_await 42; // expected-error {{call to unavailable member function 'await_transform'}}
@@ -579,6 +583,7 @@ struct bad_promise_10 {
   suspend_always final_suspend();
   int await_transform;
   void return_void();
+  void unhandled_exception();
 };
 coro<bad_promise_10> bad_coawait() {
   // FIXME this diagnostic is terrible
@@ -595,6 +600,7 @@ struct good_promise_1 {
   coro<good_promise_1> get_return_object();
   suspend_always initial_suspend();
   suspend_always final_suspend();
+  void unhandled_exception();
   static const call_operator await_transform;
   using Fn = void (*)();
   Fn return_void = ret_void;
@@ -617,6 +623,7 @@ struct good_promise_2 {
   suspend_always initial_suspend();
   suspend_always final_suspend();
   void return_void();
+  void unhandled_exception();
 };
 template<> struct std::experimental::coroutine_handle<good_promise_2> {};
 




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