[libc-commits] [libc] [libc][errno] Use macro instead of system header (PR #91150)

via libc-commits libc-commits at lists.llvm.org
Sun May 12 03:24:09 PDT 2024


llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-libc

Author: Robin Caloudis (robincaloudis)

<details>
<summary>Changes</summary>

## Why
Currently, the system header `errno.h` is included in `libc_errno.h`, which is supposed to be consumed by internal implementations only. As unit and hermetic tests should never use `#include <errno.h>` but instead use `#include "src/errno/libc_errno.h"`, we do not want to implicitly include `errno.h`. In order to have a clear seperation between those two, we want to pull out the definitions of errno numbers from `errno.h`.

## What
* Extract the definition of errno numbers from [include/errno.h.def](https://github.com/llvm/llvm-project/pull/91150/files#diff-ed38ed463ed50571b498a5b69039cab58dc9d145da7f751a24da9d77f07781cd) and place it under [include/llvm-libc-macros/linux/error-number-macros.h](https://github.com/llvm/llvm-project/pull/91150/files#diff-d6192866629690ebb7cefa1f0a90b6675073e9642f3279df08a04dcdb05fd892) 
    * Provide mips-specific errno numbers in [include/llvm-libc-macros/linux/mips/error-number-macros.h](https://github.com/llvm/llvm-project/pull/91150/files#diff-3fd35a4c94e0cc359933e497b10311d857857b2e173e8afebc421b04b7527743)
        * Find definition of mips errno numbers in glibc [here](https://github.com/bminor/glibc/blob/ea73eb5f581ef5931fd67005aa0c526ba43366c9/sysdeps/unix/sysv/linux/mips/bits/errno.h#L32-L50) (equally defined in the Linux kernel)
    * Provide sparc-specific errno numbers in [include/llvm-libc-macros/linux/sparc/error-number-macros.h](https://github.com/llvm/llvm-project/pull/91150/files#diff-5f16ffb2a51a6f72ebd4403aca7e1edea48289c99dd5978a1c84385bec4f226b) 
        * Find definition of sparc errno numbers in glibc [here](https://github.com/bminor/glibc/blob/ea73eb5f581ef5931fd67005aa0c526ba43366c9/sysdeps/unix/sysv/linux/sparc/bits/errno.h#L33-L51) (equally defined in the Linux kernel)
* Include `error-number-macros.h` instead of the system header `errno.h` in `libc_errno.h`

Closes https://github.com/llvm/llvm-project/issues/80172

---
Full diff: https://github.com/llvm/llvm-project/pull/91150.diff


12 Files Affected:

- (modified) libc/include/errno.h.def (+1-19) 
- (modified) libc/include/llvm-libc-macros/CMakeLists.txt (+6) 
- (added) libc/include/llvm-libc-macros/error-number-macros.h (+8) 
- (modified) libc/include/llvm-libc-macros/generic-error-number-macros.h (+2) 
- (modified) libc/include/llvm-libc-macros/linux/CMakeLists.txt (+12) 
- (added) libc/include/llvm-libc-macros/linux/error-number-macros.h (+32) 
- (added) libc/include/llvm-libc-macros/linux/mips/CMakeLists.txt (+5) 
- (added) libc/include/llvm-libc-macros/linux/mips/error-number-macros.h (+24) 
- (added) libc/include/llvm-libc-macros/linux/sparc/CMakeLists.txt (+5) 
- (added) libc/include/llvm-libc-macros/linux/sparc/error-number-macros.h (+24) 
- (modified) libc/src/errno/CMakeLists.txt (+2) 
- (modified) libc/src/errno/libc_errno.h (+2-5) 


``````````diff
diff --git a/libc/include/errno.h.def b/libc/include/errno.h.def
index d7ae90ad45247..3ffcd3fe4c721 100644
--- a/libc/include/errno.h.def
+++ b/libc/include/errno.h.def
@@ -15,29 +15,11 @@
 
 #include <linux/errno.h>
 
-#ifndef ERFKILL
-#define ERFKILL 132
-#endif // ERFKILL
-
-#ifndef EOWNERDEAD
-#define EOWNERDEAD 130
-#endif // EOWNERDEAD
-
-#ifndef EHWPOISON
-#define EHWPOISON 133
-#endif // EHWPOISON
-
-#ifndef ECANCELED
-#define ECANCELED 125
-#endif // ECANCELED
-
 #ifndef ENOTSUP
 #define ENOTSUP EOPNOTSUPP
 #endif // ENOTSUP
 
-#ifndef ENOTRECOVERABLE
-#define ENOTRECOVERABLE 131
-#endif // ENOTRECOVERABLE
+#include "llvm-libc-macros/linux/error-number-macros.h"
 
 #else // __linux__
 #include "llvm-libc-macros/generic-error-number-macros.h"
diff --git a/libc/include/llvm-libc-macros/CMakeLists.txt b/libc/include/llvm-libc-macros/CMakeLists.txt
index 68ba110aec80f..961830ef97668 100644
--- a/libc/include/llvm-libc-macros/CMakeLists.txt
+++ b/libc/include/llvm-libc-macros/CMakeLists.txt
@@ -37,6 +37,12 @@ add_macro_header(
     assert-macros.h
 )
 
+add_macro_header(
+  error_number_macros
+  HDR
+    error-number-macros.h
+)
+
 add_macro_header(
   generic_error_number_macros
   HDR
diff --git a/libc/include/llvm-libc-macros/error-number-macros.h b/libc/include/llvm-libc-macros/error-number-macros.h
new file mode 100644
index 0000000000000..29bd54d07f2e4
--- /dev/null
+++ b/libc/include/llvm-libc-macros/error-number-macros.h
@@ -0,0 +1,8 @@
+#ifndef LLVM_LIBC_MACROS_ERROR_NUMBER_MACROS_H
+#define LLVM_LIBC_MACROS_ERROR_NUMBER_MACROS_H
+
+#ifdef __linux__
+#include "linux/error-number-macros.h"
+#endif
+
+#endif // LLVM_LIBC_MACROS_ERROR_NUMBER_MACROS_H
diff --git a/libc/include/llvm-libc-macros/generic-error-number-macros.h b/libc/include/llvm-libc-macros/generic-error-number-macros.h
index 7ee0352669b8a..b5b1b676dacc3 100644
--- a/libc/include/llvm-libc-macros/generic-error-number-macros.h
+++ b/libc/include/llvm-libc-macros/generic-error-number-macros.h
@@ -44,5 +44,7 @@
 #define EDOM 33
 #define ERANGE 34
 #define EILSEQ 35
+#define ENAMETOOLONG 36
+#define EOVERFLOW 75
 
 #endif // LLVM_LIBC_MACROS_GENERIC_ERROR_NUMBER_MACROS_H
diff --git a/libc/include/llvm-libc-macros/linux/CMakeLists.txt b/libc/include/llvm-libc-macros/linux/CMakeLists.txt
index 4ee429d1db166..a07803103eefa 100644
--- a/libc/include/llvm-libc-macros/linux/CMakeLists.txt
+++ b/libc/include/llvm-libc-macros/linux/CMakeLists.txt
@@ -1,3 +1,15 @@
+add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/mips)
+add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/sparc)
+
+add_header(
+  error_number_macros
+  HDR
+    error-number-macros.h
+  DEPENDS
+    .mips.error_number_macros
+    .sparc.error_number_macros
+)
+
 add_header(
   fcntl_macros
   HDR
diff --git a/libc/include/llvm-libc-macros/linux/error-number-macros.h b/libc/include/llvm-libc-macros/linux/error-number-macros.h
new file mode 100644
index 0000000000000..4c8b3feb3dc39
--- /dev/null
+++ b/libc/include/llvm-libc-macros/linux/error-number-macros.h
@@ -0,0 +1,32 @@
+#ifndef LLVM_LIBC_MACROS_LINUX_ERROR_NUMBER_MACROS_H
+#define LLVM_LIBC_MACROS_LINUX_ERROR_NUMBER_MACROS_H
+
+#if defined(__mips__)
+#include "mips/error-number-macros.h"
+
+#elif defined(__sparc__)
+#include "sparc/error-number-macros.h"
+
+#else
+#ifndef ECANCELED
+#define ECANCELED 125
+#endif // ECANCELED
+
+#ifndef EOWNERDEAD
+#define EOWNERDEAD 130
+#endif // EOWNERDEAD
+
+#ifndef ENOTRECOVERABLE
+#define ENOTRECOVERABLE 131
+#endif // ENOTRECOVERABLE
+
+#ifndef ERFKILL
+#define ERFKILL 132
+#endif // ERFKILL
+
+#ifndef EHWPOISON
+#define EHWPOISON 133
+#endif // EHWPOISON
+#endif
+
+#endif // LLVM_LIBC_MACROS_LINUX_ERROR_NUMBER_MACROS_H
diff --git a/libc/include/llvm-libc-macros/linux/mips/CMakeLists.txt b/libc/include/llvm-libc-macros/linux/mips/CMakeLists.txt
new file mode 100644
index 0000000000000..eee4cfd193968
--- /dev/null
+++ b/libc/include/llvm-libc-macros/linux/mips/CMakeLists.txt
@@ -0,0 +1,5 @@
+add_header(
+  error_number_macros
+  HDR
+    error-number-macros.h
+)
diff --git a/libc/include/llvm-libc-macros/linux/mips/error-number-macros.h b/libc/include/llvm-libc-macros/linux/mips/error-number-macros.h
new file mode 100644
index 0000000000000..af2a4243e3cea
--- /dev/null
+++ b/libc/include/llvm-libc-macros/linux/mips/error-number-macros.h
@@ -0,0 +1,24 @@
+#ifndef LLVM_LIBC_MACROS_LINUX_MIPS_ERROR_NUMBER_MACROS_H
+#define LLVM_LIBC_MACROS_LINUX_MIPS_ERROR_NUMBER_MACROS_H
+
+#ifndef ECANCELED
+#define ECANCELED 158
+#endif // ECANCELED
+
+#ifndef EOWNERDEAD
+#define EOWNERDEAD 165
+#endif // EOWNERDEAD
+
+#ifndef ENOTRECOVERABLE
+#define ENOTRECOVERABLE 166
+#endif // ENOTRECOVERABLE
+
+#ifndef ERFKILL
+#define ERFKILL 167
+#endif // ERFKILL
+
+#ifndef EHWPOISON
+#define EHWPOISON 168
+#endif // EHWPOISON
+
+#endif // LLVM_LIBC_MACROS_LINUX_MIPS_ERROR_NUMBER_MACROS_H
diff --git a/libc/include/llvm-libc-macros/linux/sparc/CMakeLists.txt b/libc/include/llvm-libc-macros/linux/sparc/CMakeLists.txt
new file mode 100644
index 0000000000000..eee4cfd193968
--- /dev/null
+++ b/libc/include/llvm-libc-macros/linux/sparc/CMakeLists.txt
@@ -0,0 +1,5 @@
+add_header(
+  error_number_macros
+  HDR
+    error-number-macros.h
+)
diff --git a/libc/include/llvm-libc-macros/linux/sparc/error-number-macros.h b/libc/include/llvm-libc-macros/linux/sparc/error-number-macros.h
new file mode 100644
index 0000000000000..76a1408bf7601
--- /dev/null
+++ b/libc/include/llvm-libc-macros/linux/sparc/error-number-macros.h
@@ -0,0 +1,24 @@
+#ifndef LLVM_LIBC_MACROS_LINUX_SPARC_ERROR_NUMBER_MACROS_H
+#define LLVM_LIBC_MACROS_LINUX_SPARC_ERROR_NUMBER_MACROS_H
+
+#ifndef ECANCELED
+#define ECANCELED 127
+#endif // ECANCELED
+
+#ifndef EOWNERDEAD
+#define EOWNERDEAD 132
+#endif // EOWNERDEAD
+
+#ifndef ENOTRECOVERABLE
+#define ENOTRECOVERABLE 133
+#endif // ENOTRECOVERABLE
+
+#ifndef ERFKILL
+#define ERFKILL 134
+#endif // ERFKILL
+
+#ifndef EHWPOISON
+#define EHWPOISON 135
+#endif // EHWPOISON
+
+#endif // LLVM_LIBC_MACROS_LINUX_SPARC_ERROR_NUMBER_MACROS_H
diff --git a/libc/src/errno/CMakeLists.txt b/libc/src/errno/CMakeLists.txt
index d9b8d9957c170..5fc8a0263ea4a 100644
--- a/libc/src/errno/CMakeLists.txt
+++ b/libc/src/errno/CMakeLists.txt
@@ -19,5 +19,7 @@ add_entrypoint_object(
     ${full_build_flag}
   DEPENDS
     libc.include.errno
+    libc.include.llvm-libc-macros.error_number_macros
+    libc.include.llvm-libc-macros.generic_error_number_macros
     libc.src.__support.common
 )
diff --git a/libc/src/errno/libc_errno.h b/libc/src/errno/libc_errno.h
index 5afc0a41d348a..387a3fc31234e 100644
--- a/libc/src/errno/libc_errno.h
+++ b/libc/src/errno/libc_errno.h
@@ -12,11 +12,8 @@
 #include "src/__support/macros/attributes.h"
 #include "src/__support/macros/properties/architectures.h"
 
-// TODO: https://github.com/llvm/llvm-project/issues/80172
-// Separate just the definition of errno numbers in
-// include/llvm-libc-macros/* and only include that instead of the system
-// <errno.h>.
-#include <errno.h>
+#include <include/llvm-libc-macros/error-number-macros.h>
+#include <include/llvm-libc-macros/generic-error-number-macros.h>
 
 // This header is to be consumed by internal implementations, in which all of
 // them should refer to `libc_errno` instead of using `errno` directly from

``````````

</details>


https://github.com/llvm/llvm-project/pull/91150


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