d9f033146b
The 'errno' value is most likely not useful on the GPU and it prevents
us from providing certain functions on the GPU that depend on it, like
`atoi`. This patch makes the necessary changes to support `errno` by
simple replacing it with a consumer class.
Supporting `errno` on the GPU is possible in some aspects. The first
approach would be to use a buffer of shared memory that has enough space
for all threads. Another option would be to change code generation to
support `thread_local` using `address_space(5)` memory allocated at
kernel launch. The former could look like the following, which could be
implemented in a later patch:
```
template <typename T>
using SharedBuffer = T[gpu::MAX_THREADS] [[clang::address_space(3)]];
template <typename T> struct ErrnoSetter {
constexpr ErrnoSetter(SharedBuffer<T> &storage) : storage(storage) {}
SharedBuffer<T> &storage;
void operator=(const T &val) { storage[gpu::get_thread_id()] = val; }
};
static SharedBuffer<int> thread_local_buffer [[clang::loader_uninitialized]];
ErrnoSetter<int> __llvmlibc_internal_errno(thread_local_buffer);
```
Reviewed By: sivachandra
Differential Revision: https://reviews.llvm.org/D149107
52 lines
1.1 KiB
Modula-2
52 lines
1.1 KiB
Modula-2
//===-- C standard library header errno.h ---------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIBC_ERRNO_H
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#define LLVM_LIBC_ERRNO_H
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#include <__llvm-libc-common.h>
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#ifdef __linux__
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#include <linux/errno.h>
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#ifndef ERFKILL
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#define ERFKILL 132
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#endif // ERFKILL
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#ifndef EOWNERDEAD
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#define EOWNERDEAD 130
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#endif // EOWNERDEAD
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#ifndef EHWPOISON
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#define EHWPOISON 133
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#endif // EHWPOISON
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#ifndef ECANCELED
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#define ECANCELED 125
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#endif // ECANCELED
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#ifndef ENOTSUP
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#define ENOTSUP EOPNOTSUPP
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#endif // ENOTSUP
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#ifndef ENOTRECOVERABLE
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#define ENOTRECOVERABLE 131
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#endif // ENOTRECOVERABLE
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#else // __linux__
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#include <llvm-libc-macros/generic-error-number-macros.h>
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#endif
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#if !defined(__AMDGPU__) && !defined(__NVPTX__)
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extern _Thread_local int __llvmlibc_errno;
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#define errno __llvmlibc_errno
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#endif
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#endif // LLVM_LIBC_ERRNO_H
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