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