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* [gcc r12-9500] coroutines: Build pointer initializers with nullptr_node [PR107768]
@ 2023-04-30 8:27 Iain D Sandoe
0 siblings, 0 replies; only message in thread
From: Iain D Sandoe @ 2023-04-30 8:27 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:db0985039fa58d5ef5d4ed10d2cbfd5b3ea6b3ee
commit r12-9500-gdb0985039fa58d5ef5d4ed10d2cbfd5b3ea6b3ee
Author: Andrew Pinski <pinskia@gmail.com>
Date: Thu Dec 8 22:34:16 2022 +0000
coroutines: Build pointer initializers with nullptr_node [PR107768]
The PR reports that using integer_zero_node triggers a warning for
-Wzero-as-null-pointer-constant which comes from compiler-generated code so
makes no sense to the end user.
Co-Authored-By: Iain Sandoe <iain@sandoe.co.uk>
PR c++/107768
gcc/cp/ChangeLog:
* coroutines.cc (coro_rewrite_function_body): Initialize pointers
from nullptr_node. (morph_fn_to_coro): Likewise.
gcc/testsuite/ChangeLog:
* g++.dg/coroutines/pr107768.C: New test.
(cherry picked from commit 0b1d66658ecdcc3d9251641a0b902b4c73ace303)
Diff:
---
gcc/cp/coroutines.cc | 6 +++---
gcc/testsuite/g++.dg/coroutines/pr107768.C | 26 ++++++++++++++++++++++++++
2 files changed, 29 insertions(+), 3 deletions(-)
diff --git a/gcc/cp/coroutines.cc b/gcc/cp/coroutines.cc
index 908e23597a2..71a22b5ad90 100644
--- a/gcc/cp/coroutines.cc
+++ b/gcc/cp/coroutines.cc
@@ -4135,7 +4135,7 @@ coro_rewrite_function_body (location_t fn_start, tree fnbody, tree orig,
/* We will need to be able to set the resume function pointer to nullptr
to signal that the coroutine is 'done'. */
tree zero_resume
- = build1 (CONVERT_EXPR, resume_fn_ptr_type, integer_zero_node);
+ = build1 (CONVERT_EXPR, resume_fn_ptr_type, nullptr_node);
/* The pointer to the destroy function. */
tree var = coro_build_artificial_var (fn_start, coro_destroy_fn_id,
@@ -4522,7 +4522,7 @@ morph_fn_to_coro (tree orig, tree *resumer, tree *destroyer)
tree ramp_body = push_stmt_list ();
tree zeroinit = build1_loc (fn_start, CONVERT_EXPR,
- coro_frame_ptr, integer_zero_node);
+ coro_frame_ptr, nullptr_node);
tree coro_fp = coro_build_artificial_var (fn_start, "_Coro_frameptr",
coro_frame_ptr, orig, zeroinit);
tree varlist = coro_fp;
@@ -4757,7 +4757,7 @@ morph_fn_to_coro (tree orig, tree *resumer, tree *destroyer)
gcc_checking_assert (same_type_p (fn_return_type, TREE_TYPE (grooaf)));
tree if_stmt = begin_if_stmt ();
- tree cond = build1 (CONVERT_EXPR, coro_frame_ptr, integer_zero_node);
+ tree cond = build1 (CONVERT_EXPR, coro_frame_ptr, nullptr_node);
cond = build2 (EQ_EXPR, boolean_type_node, coro_fp, cond);
finish_if_stmt_cond (cond, if_stmt);
if (VOID_TYPE_P (fn_return_type))
diff --git a/gcc/testsuite/g++.dg/coroutines/pr107768.C b/gcc/testsuite/g++.dg/coroutines/pr107768.C
new file mode 100644
index 00000000000..22d7074f261
--- /dev/null
+++ b/gcc/testsuite/g++.dg/coroutines/pr107768.C
@@ -0,0 +1,26 @@
+// { dg-additional-options "-Wzero-as-null-pointer-constant -fsyntax-only" }
+
+#include <coroutine>
+
+struct task
+{
+ struct promise_type
+ {
+ task get_return_object() { return {}; }
+ std::suspend_never initial_suspend() { return {}; }
+ std::suspend_never final_suspend() noexcept { return {}; }
+ void return_void() {}
+ void unhandled_exception() {}
+ };
+};
+
+task resuming_on_new_thread(void)
+{
+ struct awaitable
+ {
+ bool await_ready() { return false; }
+ void await_suspend(std::coroutine_handle<> h) { }
+ void await_resume() {}
+ };
+ co_await awaitable{};
+}
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