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[libc++][print] Moves is_terminal to the dylib. #80464

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merged 1 commit into from
Feb 10, 2024
Merged

[libc++][print] Moves is_terminal to the dylib. #80464

merged 1 commit into from
Feb 10, 2024

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@mordante mordante commented Feb 2, 2024

Having the test in the header requires including unistd.h on POSIX platforms. This header has other declarations which may conflict with code that uses named declarations provided by this header. For example code using "int pipe;" would conflict with the function pipe in this header.

Moving the code to the dylib means std::print would not be available on Apple backdeployment targets. On POSIX platforms there is no transcoding required so a not Standard conforming implementation is still a useful and the observable differences are minimal. This behaviour has been done for print before #76293.

Note questions have been raised in LWG4044 "Confusing requirements for std::print on POSIX platforms", whether or not the isatty check on POSIX platforms is required. When this LWG issue is resolved the backdeployment targets could become Standard compliant.

This patch is intended to be backported to the LLVM-18 branch.

Fixes: #79782

@mordante mordante marked this pull request as ready for review February 5, 2024 17:32
@mordante mordante requested a review from a team as a code owner February 5, 2024 17:32
@llvmbot llvmbot added the libc++ libc++ C++ Standard Library. Not GNU libstdc++. Not libc++abi. label Feb 5, 2024
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llvmbot commented Feb 5, 2024

@llvm/pr-subscribers-libcxx

Author: Mark de Wever (mordante)

Changes

Having the test in the header requires including unistd.h on POSIX platforms. This header has other declarations which may conflict with code that uses named declarations provided by this header. For example code using "int pipe;" would conflict with the function pipe in this header.

Moving the code to the dylib means std::print would not be available on Apple backdeployment targets. On POSIX platforms there is no transcoding required so a not Standard conforming implementation is still a useful and the observable differences are minimal. This behaviour has been done for print before #76293.

Note questions have been raised in LWG4044 "Confusing requirements for std::print on POSIX platforms", whether or not the isatty check on POSIX platforms is required. When this LWG issue is resolved the backdeployment targets could become Standard compliant.

This patch is intended to be backported to the LLVM-18 branch.

Fixes: #79782

Full diff: https://github.com/llvm/llvm-project/pull/80464.diff

9 Files Affected:

  • (modified) libcxx/include/print (+7-7)
  • (modified) libcxx/lib/abi/arm64-apple-darwin.libcxxabi.v1.stable.exceptions.nonew.abilist (+1)
  • (modified) libcxx/lib/abi/i686-linux-android21.libcxxabi.v1.stable.exceptions.nonew.abilist (+1)
  • (modified) libcxx/lib/abi/powerpc-ibm-aix.libcxxabi.v1.stable.exceptions.nonew.abilist (+1)
  • (modified) libcxx/lib/abi/powerpc64-ibm-aix.libcxxabi.v1.stable.exceptions.nonew.abilist (+1)
  • (modified) libcxx/lib/abi/x86_64-apple-darwin.libcxxabi.v1.stable.exceptions.nonew.abilist (+1)
  • (modified) libcxx/lib/abi/x86_64-unknown-freebsd.libcxxabi.v1.stable.exceptions.nonew.abilist (+1)
  • (modified) libcxx/lib/abi/x86_64-unknown-linux-gnu.libcxxabi.v1.stable.exceptions.nonew.abilist (+1)
  • (modified) libcxx/src/print.cpp (+16-9)
diff --git a/libcxx/include/print b/libcxx/include/print
index 7f2b5bac3dcf61..543a540ee4f27d 100644
--- a/libcxx/include/print
+++ b/libcxx/include/print
@@ -32,6 +32,7 @@ namespace std {
 */
 
 #include <__assert> // all public C++ headers provide the assertion handler
+#include <__availability>
 #include <__concepts/same_as.h>
 #include <__config>
 #include <__system_error/system_error.h>
@@ -43,10 +44,6 @@ namespace std {
 #include <string_view>
 #include <version>
 
-#if __has_include(<unistd.h>)
-#  include <unistd.h>
-#endif
-
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
 #endif
@@ -68,7 +65,8 @@ _LIBCPP_EXPORTED_FROM_ABI bool __is_windows_terminal(FILE* __stream);
 // Note the function is only implemented on the Windows platform.
 _LIBCPP_EXPORTED_FROM_ABI void __write_to_windows_console(FILE* __stream, wstring_view __view);
 #  endif // _LIBCPP_HAS_NO_WIDE_CHARACTERS
-
+#elif __has_include(<unistd.h>)
+_LIBCPP_EXPORTED_FROM_ABI bool __is_posix_terminal(FILE* __stream);
 #endif // _LIBCPP_WIN32API
 
 #if _LIBCPP_STD_VER >= 23
@@ -195,15 +193,17 @@ inline constexpr bool __use_unicode_execution_charset = _MSVC_EXECUTION_CHARACTE
 inline constexpr bool __use_unicode_execution_charset = true;
 #  endif
 
-_LIBCPP_HIDE_FROM_ABI inline bool __is_terminal(FILE* __stream) {
+_LIBCPP_HIDE_FROM_ABI inline bool __is_terminal([[maybe_unused]] FILE* __stream) {
   // The macro _LIBCPP_TESTING_PRINT_IS_TERMINAL is used to change
   // the behavior in the test. This is not part of the public API.
 #  ifdef _LIBCPP_TESTING_PRINT_IS_TERMINAL
   return _LIBCPP_TESTING_PRINT_IS_TERMINAL(__stream);
+#  elif _LIBCPP_AVAILABILITY_HAS_PRINT == 0
+  return false;
 #  elif defined(_LIBCPP_WIN32API)
   return std::__is_windows_terminal(__stream);
 #  elif __has_include(<unistd.h>)
-  return isatty(fileno(__stream));
+  return std::__is_posix_terminal(__stream);
 #  else
 #    error "Provide a way to determine whether a FILE* is a terminal"
 #  endif
diff --git a/libcxx/lib/abi/arm64-apple-darwin.libcxxabi.v1.stable.exceptions.nonew.abilist b/libcxx/lib/abi/arm64-apple-darwin.libcxxabi.v1.stable.exceptions.nonew.abilist
index c2fea4d8adb420..2064f45bf8c084 100644
--- a/libcxx/lib/abi/arm64-apple-darwin.libcxxabi.v1.stable.exceptions.nonew.abilist
+++ b/libcxx/lib/abi/arm64-apple-darwin.libcxxabi.v1.stable.exceptions.nonew.abilist
@@ -1495,6 +1495,7 @@
 {'is_defined': True, 'name': '__ZNSt3__118shared_timed_mutex8try_lockEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__118shared_timed_mutexC1Ev', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__118shared_timed_mutexC2Ev', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNSt3__119__is_posix_terminalEP7__sFILE', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__119__shared_mutex_base11lock_sharedEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__119__shared_mutex_base13unlock_sharedEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__119__shared_mutex_base15try_lock_sharedEv', 'type': 'FUNC'}
diff --git a/libcxx/lib/abi/i686-linux-android21.libcxxabi.v1.stable.exceptions.nonew.abilist b/libcxx/lib/abi/i686-linux-android21.libcxxabi.v1.stable.exceptions.nonew.abilist
index a60f099b532052..fec3a4505a0c6d 100644
--- a/libcxx/lib/abi/i686-linux-android21.libcxxabi.v1.stable.exceptions.nonew.abilist
+++ b/libcxx/lib/abi/i686-linux-android21.libcxxabi.v1.stable.exceptions.nonew.abilist
@@ -1176,6 +1176,7 @@
 {'is_defined': True, 'name': '_ZNSt6__ndk118shared_timed_mutex8try_lockEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt6__ndk118shared_timed_mutexC1Ev', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt6__ndk118shared_timed_mutexC2Ev', 'type': 'FUNC'}
+{'is_defined': True, 'name': '_ZNSt6__ndk119__is_posix_terminalEP7__sFILE', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt6__ndk119__shared_mutex_base11lock_sharedEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt6__ndk119__shared_mutex_base13unlock_sharedEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt6__ndk119__shared_mutex_base15try_lock_sharedEv', 'type': 'FUNC'}
diff --git a/libcxx/lib/abi/powerpc-ibm-aix.libcxxabi.v1.stable.exceptions.nonew.abilist b/libcxx/lib/abi/powerpc-ibm-aix.libcxxabi.v1.stable.exceptions.nonew.abilist
index a159ff52218667..e52cf98dd4c4f1 100644
--- a/libcxx/lib/abi/powerpc-ibm-aix.libcxxabi.v1.stable.exceptions.nonew.abilist
+++ b/libcxx/lib/abi/powerpc-ibm-aix.libcxxabi.v1.stable.exceptions.nonew.abilist
@@ -534,6 +534,7 @@
 {'import_export': 'EXP', 'is_defined': True, 'name': '_ZNSt3__118shared_timed_mutex8try_lockEv', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'EXP', 'is_defined': True, 'name': '_ZNSt3__118shared_timed_mutexC1Ev', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'EXP', 'is_defined': True, 'name': '_ZNSt3__118shared_timed_mutexC2Ev', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
+{'import_export': 'EXP', 'is_defined': True, 'name': '_ZNSt3__119__is_posix_terminalEP4FILE', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'EXP', 'is_defined': True, 'name': '_ZNSt3__119__shared_mutex_base11lock_sharedEv', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'EXP', 'is_defined': True, 'name': '_ZNSt3__119__shared_mutex_base13unlock_sharedEv', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'EXP', 'is_defined': True, 'name': '_ZNSt3__119__shared_mutex_base15try_lock_sharedEv', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
diff --git a/libcxx/lib/abi/powerpc64-ibm-aix.libcxxabi.v1.stable.exceptions.nonew.abilist b/libcxx/lib/abi/powerpc64-ibm-aix.libcxxabi.v1.stable.exceptions.nonew.abilist
index 5749a7520f9bac..52a04706ddf20b 100644
--- a/libcxx/lib/abi/powerpc64-ibm-aix.libcxxabi.v1.stable.exceptions.nonew.abilist
+++ b/libcxx/lib/abi/powerpc64-ibm-aix.libcxxabi.v1.stable.exceptions.nonew.abilist
@@ -534,6 +534,7 @@
 {'import_export': 'EXP', 'is_defined': True, 'name': '_ZNSt3__118shared_timed_mutex8try_lockEv', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'EXP', 'is_defined': True, 'name': '_ZNSt3__118shared_timed_mutexC1Ev', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'EXP', 'is_defined': True, 'name': '_ZNSt3__118shared_timed_mutexC2Ev', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
+{'import_export': 'EXP', 'is_defined': True, 'name': '_ZNSt3__119__is_posix_terminalEP4FILE', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'EXP', 'is_defined': True, 'name': '_ZNSt3__119__shared_mutex_base11lock_sharedEv', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'EXP', 'is_defined': True, 'name': '_ZNSt3__119__shared_mutex_base13unlock_sharedEv', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'EXP', 'is_defined': True, 'name': '_ZNSt3__119__shared_mutex_base15try_lock_sharedEv', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
diff --git a/libcxx/lib/abi/x86_64-apple-darwin.libcxxabi.v1.stable.exceptions.nonew.abilist b/libcxx/lib/abi/x86_64-apple-darwin.libcxxabi.v1.stable.exceptions.nonew.abilist
index e827114f169197..bced6b2ea81ba5 100644
--- a/libcxx/lib/abi/x86_64-apple-darwin.libcxxabi.v1.stable.exceptions.nonew.abilist
+++ b/libcxx/lib/abi/x86_64-apple-darwin.libcxxabi.v1.stable.exceptions.nonew.abilist
@@ -1495,6 +1495,7 @@
 {'is_defined': True, 'name': '__ZNSt3__118shared_timed_mutex8try_lockEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__118shared_timed_mutexC1Ev', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__118shared_timed_mutexC2Ev', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNSt3__119__is_posix_terminalEP7__sFILE', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__119__shared_mutex_base11lock_sharedEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__119__shared_mutex_base13unlock_sharedEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__119__shared_mutex_base15try_lock_sharedEv', 'type': 'FUNC'}
diff --git a/libcxx/lib/abi/x86_64-unknown-freebsd.libcxxabi.v1.stable.exceptions.nonew.abilist b/libcxx/lib/abi/x86_64-unknown-freebsd.libcxxabi.v1.stable.exceptions.nonew.abilist
index e3d3fcb35d8403..ebda5b0dfba57d 100644
--- a/libcxx/lib/abi/x86_64-unknown-freebsd.libcxxabi.v1.stable.exceptions.nonew.abilist
+++ b/libcxx/lib/abi/x86_64-unknown-freebsd.libcxxabi.v1.stable.exceptions.nonew.abilist
@@ -1190,6 +1190,7 @@
 {'is_defined': True, 'name': '_ZNSt3__118shared_timed_mutex8try_lockEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__118shared_timed_mutexC1Ev', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__118shared_timed_mutexC2Ev', 'type': 'FUNC'}
+{'is_defined': True, 'name': '_ZNSt3__119__is_posix_terminalEP7__sFILE', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__119__shared_mutex_base11lock_sharedEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__119__shared_mutex_base13unlock_sharedEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__119__shared_mutex_base15try_lock_sharedEv', 'type': 'FUNC'}
diff --git a/libcxx/lib/abi/x86_64-unknown-linux-gnu.libcxxabi.v1.stable.exceptions.nonew.abilist b/libcxx/lib/abi/x86_64-unknown-linux-gnu.libcxxabi.v1.stable.exceptions.nonew.abilist
index 16923301d2548e..6432ad3be35859 100644
--- a/libcxx/lib/abi/x86_64-unknown-linux-gnu.libcxxabi.v1.stable.exceptions.nonew.abilist
+++ b/libcxx/lib/abi/x86_64-unknown-linux-gnu.libcxxabi.v1.stable.exceptions.nonew.abilist
@@ -1188,6 +1188,7 @@
 {'is_defined': True, 'name': '_ZNSt3__118shared_timed_mutex8try_lockEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__118shared_timed_mutexC1Ev', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__118shared_timed_mutexC2Ev', 'type': 'FUNC'}
+{'is_defined': True, 'name': '_ZNSt3__119__is_posix_terminalEP8_IO_FILE', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__119__shared_mutex_base11lock_sharedEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__119__shared_mutex_base13unlock_sharedEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__119__shared_mutex_base15try_lock_sharedEv', 'type': 'FUNC'}
diff --git a/libcxx/src/print.cpp b/libcxx/src/print.cpp
index 3692187a5954a3..8fa59fdd097bcd 100644
--- a/libcxx/src/print.cpp
+++ b/libcxx/src/print.cpp
@@ -8,22 +8,26 @@
 
 #include <__config>
 
-#if defined(_LIBCPP_WIN32API)
+#include <cstdlib>
+#include <print>
+
+#include <__system_error/system_error.h>
 
-#  include <cstdlib>
-#  include <print>
+#include "filesystem/error.h"
 
+#if defined(_LIBCPP_WIN32API)
 #  define WIN32_LEAN_AND_MEAN
 #  define NOMINMAX
 #  include <io.h>
 #  include <windows.h>
-
-#  include <__system_error/system_error.h>
-
-#  include "filesystem/error.h"
+#elif __has_include(<unistd.h>)
+#  include <unistd.h>
+#endif
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
+#if defined(_LIBCPP_WIN32API)
+
 _LIBCPP_EXPORTED_FROM_ABI bool __is_windows_terminal(FILE* __stream) {
   // Note the Standard does this in one call, but it's unclear whether
   // an invalid handle is allowed when calling GetConsoleMode.
@@ -52,6 +56,9 @@ __write_to_windows_console([[maybe_unused]] FILE* __stream, [[maybe_unused]] wst
 }
 #  endif // _LIBCPP_HAS_NO_WIDE_CHARACTERS
 
-_LIBCPP_END_NAMESPACE_STD
+#elif __has_include(<unistd.h>) // !_LIBCPP_WIN32API
 
-#endif // !_LIBCPP_WIN32API
+_LIBCPP_EXPORTED_FROM_ABI bool __is_posix_terminal(FILE* __stream) { return isatty(fileno(__stream)); }
+#endif
+
+_LIBCPP_END_NAMESPACE_STD

@ldionne ldionne self-assigned this Feb 6, 2024
ldionne
ldionne approved these changes Feb 6, 2024
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Thanks, this LGTM!

libcxx/lib/abi/arm64-apple-darwin.libcxxabi.v1.stable.exceptions.nonew.abilist
@@ -1495,6 +1495,7 @@
{'is_defined': True, 'name': '__ZNSt3__118shared_timed_mutex8try_lockEv', 'type': 'FUNC'}
{'is_defined': True, 'name': '__ZNSt3__118shared_timed_mutexC1Ev', 'type': 'FUNC'}
{'is_defined': True, 'name': '__ZNSt3__118shared_timed_mutexC2Ev', 'type': 'FUNC'}
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You should update the abi/CHANGELOG.txt too.

@mordante mordante added this to the LLVM 18.X Release milestone Feb 9, 2024
@mordante
[libc++][print] Moves is_terminal to the dylib.
28e9c94 
Having the test in the header requires including unistd.h on POSIX
platforms. This header has other declarations which may conflict with
code that uses named declarations provided by this header. For example
code using "int pipe;" would conflict with the function pipe in this
header.

Moving the code to the dylib means std::print would not be available on
Apple backdeployment targets. On POSIX platforms there is no transcoding
required so a not Standard conforming implementation is still a useful
and the observable differences are minimal. This behaviour has been done
for print before llvm#76293.

Note questions have been raised in LWG4044 "Confusing requirements for
std::print on POSIX platforms", whether or not the isatty check on POSIX
platforms is required. When this LWG issue is resolved the
backdeployment targets could become Standard compliant.

This patch is intended to be backported to the LLVM-18 branch.

Fixes: llvm#79782
@mordante mordante merged commit 4fb7b33 into llvm:main Feb 10, 2024
53 of 54 checks passed
@mordante mordante deleted the review/is_terminal_to_dylib branch February 10, 2024 16:10
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/cherry-pick 4fb7b33

llvmbot pushed a commit to llvmbot/llvm-project that referenced this pull request Feb 11, 2024
@mordante @llvmbot
[libc++][print] Moves is_terminal to the dylib. (llvm#80464)
460dc4d 
Having the test in the header requires including unistd.h on POSIX
platforms. This header has other declarations which may conflict with
code that uses named declarations provided by this header. For example
code using "int pipe;" would conflict with the function pipe in this
header.

Moving the code to the dylib means std::print would not be available on
Apple backdeployment targets. On POSIX platforms there is no transcoding
required so a not Standard conforming implementation is still a useful
and the observable differences are minimal. This behaviour has been done
for print before llvm#76293.

Note questions have been raised in LWG4044 "Confusing requirements for
std::print on POSIX platforms", whether or not the isatty check on POSIX
platforms is required. When this LWG issue is resolved the
backdeployment targets could become Standard compliant.

This patch is intended to be backported to the LLVM-18 branch.

Fixes: llvm#79782
(cherry picked from commit 4fb7b33)
@llvmbot
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llvmbot commented Feb 11, 2024

/pull-request #81410

tstellar pushed a commit to tstellar/llvm-project that referenced this pull request Feb 16, 2024
@mordante @tstellar
[libc++][print] Moves is_terminal to the dylib. (llvm#80464)
872fe20 
Having the test in the header requires including unistd.h on POSIX
platforms. This header has other declarations which may conflict with
code that uses named declarations provided by this header. For example
code using "int pipe;" would conflict with the function pipe in this
header.

Moving the code to the dylib means std::print would not be available on
Apple backdeployment targets. On POSIX platforms there is no transcoding
required so a not Standard conforming implementation is still a useful
and the observable differences are minimal. This behaviour has been done
for print before llvm#76293.

Note questions have been raised in LWG4044 "Confusing requirements for
std::print on POSIX platforms", whether or not the isatty check on POSIX
platforms is required. When this LWG issue is resolved the
backdeployment targets could become Standard compliant.

This patch is intended to be backported to the LLVM-18 branch.

Fixes: llvm#79782
(cherry picked from commit 4fb7b33)
@pointhex pointhex mentioned this pull request May 7, 2024
Closed
@aemerson aemerson mentioned this pull request May 9, 2024
Merged
@carlocab carlocab mentioned this pull request Aug 24, 2024
Open
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#include <iostream> makes it impossible to use pipe as a variable name
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