1 | //===-- GPU definition of a libc internal assert macro ----------*- C++ -*-===// |
2 | // |
3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
4 | // See https://llvm.org/LICENSE.txt for license information. |
5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
6 | // |
7 | //===----------------------------------------------------------------------===// |
8 | |
9 | #include "src/assert/__assert_fail.h" |
10 | |
11 | #include "src/__support/CPP/atomic.h" |
12 | #include "src/__support/GPU/utils.h" |
13 | #include "src/__support/libc_assert.h" |
14 | #include "src/__support/macros/config.h" |
15 | #include "src/stdlib/abort.h" |
16 | |
17 | namespace LIBC_NAMESPACE_DECL { |
18 | |
19 | // A single-use lock to allow only a single thread to print the assertion. |
20 | static cpp::Atomic<uint32_t> lock = 0; |
21 | |
22 | LLVM_LIBC_FUNCTION(void, __assert_fail, |
23 | (const char *assertion, const char *file, unsigned line, |
24 | const char *function)) { |
25 | uint64_t mask = gpu::get_lane_mask(); |
26 | // We only want a single work group or warp to handle the assertion. Each |
27 | // group attempts to claim the lock, if it is already claimed we simply exit. |
28 | uint32_t claimed = gpu::is_first_lane(mask) |
29 | ? !lock.fetch_or(1, cpp::MemoryOrder::ACQUIRE) |
30 | : 0; |
31 | if (!gpu::broadcast_value(mask, claimed)) |
32 | gpu::end_program(); |
33 | |
34 | // Only a single line should be printed if an assertion is hit. |
35 | if (gpu::is_first_lane(mask)) |
36 | LIBC_NAMESPACE::report_assertion_failure(assertion, file, line, function); |
37 | gpu::sync_lane(mask); |
38 | LIBC_NAMESPACE::abort(); |
39 | } |
40 | |
41 | } // namespace LIBC_NAMESPACE_DECL |
42 | |