[PATCH] D92662: [Clang][Coroutine] Drop const attribute on pthread_self when coroutine is enabled

[Xun Li via Phabricator via cfe-commits]

lxfind updated this revision to Diff 310599.
lxfind added a comment.

Fix test


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D92662/new/

https://reviews.llvm.org/D92662

Files:
  clang/lib/Sema/SemaDecl.cpp
  clang/test/CodeGenCoroutines/coro-pthread_self.cpp


Index: clang/test/CodeGenCoroutines/coro-pthread_self.cpp
===================================================================
--- /dev/null
+++ clang/test/CodeGenCoroutines/coro-pthread_self.cpp
@@ -0,0 +1,56 @@
+// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -fcoroutines-ts -std=c++14 -O3 -emit-llvm %s -o - | FileCheck %s
+
+#include "Inputs/coroutine.h"
+
+namespace coro = std::experimental::coroutines_v1;
+
+typedef void *pthread_t;
+pthread_t pthread_self(void) __attribute__((__const__));
+
+struct awaitable {
+  bool await_ready() { return false; }
+  void await_suspend(coro::coroutine_handle<> h);
+  void await_resume() {}
+};
+awaitable switch_to_new_thread();
+
+struct task {
+  struct promise_type {
+    task get_return_object() { return {}; }
+    coro::suspend_never initial_suspend() { return {}; }
+    coro::suspend_never final_suspend() noexcept { return {}; }
+    void return_void() {}
+    void unhandled_exception() {}
+  };
+};
+
+void check(pthread_t p1, pthread_t p2);
+
+task resuming_on_new_thread() {
+  auto pthread1 = pthread_self();
+  co_await switch_to_new_thread();
+  auto pthread2 = pthread_self();
+  check(pthread1, pthread2);
+}
+
+void non_coroutine() {
+  auto pthread1 = pthread_self();
+  check(pthread1, pthread1);
+  auto pthread2 = pthread_self();
+  check(pthread1, pthread2);
+}
+
+// CHECK-LABEL: define void @_Z13non_coroutinev()
+// CHECK-NEXT:  entry:
+// CHECK-NEXT:    %call = tail call i8* @_Z12pthread_selfv()
+// CHECK-NEXT:    tail call void @_Z5checkPvS_(i8* %call, i8* %call)
+// CHECK-NEXT:    %call1 = tail call i8* @_Z12pthread_selfv()
+// CHECK-NEXT:    tail call void @_Z5checkPvS_(i8* %call, i8* %call1)
+// CHECK-NEXT:    ret void
+// CHECK-NEXT:  }
+
+// CHECK-LABEL: define internal fastcc void @_Z22resuming_on_new_threadv.resume
+// CHECK:         %[[RELOAD_ADDR:.+.reload.addr]] = getelementptr inbounds %_Z22resuming_on_new_threadv.Frame, %_Z22resuming_on_new_threadv.Frame* %FramePtr, i64 0, i32 {{.+}}
+// CHECK:         %[[RELOAD:.+]] = load i8*, i8** %[[RELOAD_ADDR]], align 8
+// CHECK:         %[[CALL:.+]] = tail call i8* @_Z12pthread_selfv()
+// CHECK:         tail call void @_Z5checkPvS_(i8* %[[RELOAD]], i8* %[[CALL]])
Index: clang/lib/Sema/SemaDecl.cpp
===================================================================
--- clang/lib/Sema/SemaDecl.cpp
+++ clang/lib/Sema/SemaDecl.cpp
@@ -14962,6 +14962,12 @@
   IdentifierInfo *Name = FD->getIdentifier();
   if (!Name)
     return;
+
+  if (getLangOpts().Coroutines && Name->isStr("pthread_self") &&
+      FD->hasAttr<ConstAttr>()) {
+    FD->dropAttr<ConstAttr>();
+  }
+
   if ((!getLangOpts().CPlusPlus &&
        FD->getDeclContext()->isTranslationUnit()) ||
       (isa<LinkageSpecDecl>(FD->getDeclContext()) &&


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