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Replace traditional `#ifndef`/`#define`/`#endif` include guards with
`#pragma` once.
`#pragma once` is a widely supported preprocessor directive that
prevents header files from being included multiple times. It is
supported by all toolchains used to build edk2: GCC, Clang/LLVM, and
MSVC.
Compared to macro-based include guards, `#pragma once`:
- Eliminates the risk of macro name collisions or copy/paste errors
where two headers inadvertently use the same guard macro.
- Eliminate inconsistency in the way include guard macros are named
(e.g., some files use `__FILE_H__`, others use `FILE_H_`, etc.).
- Reduces boilerplate (three lines replaced by one).
- Avoids polluting the macro namespace with guard symbols.
- Can improve build times as the preprocessor can skip re-opening the
file entirely, rather than re-reading it to find the matching
`#endif` ("multiple-include optimization").
- Note that some compilers may already optimize traditional include
guards, by recognzining the idiomatic pattern.
This change is made acknowledging that overall portability of the
code will technically be reduced, as `#pragma once` is not part of the
C/C++ standards.
However, this is considered acceptable given:
1. edk2 already defines a subset of supported compilers in
BaseTools/Conf/tools_def.template, all of which have supported
`#pragma once` for over two decades.
2. There have been concerns raised to the project about inconsistent
include guard naming and potential macro collisions.
Approximate compiler support dates:
- MSVC: Supported since Visual C++ 4.2 (1996)
- GCC: Supported since 3.4 (2004)
(http://gnu.ist.utl.pt/software/gcc/gcc-3.4/changes.html)
- Clang (LLVM based): Since initial release in 2007
Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>
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REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3737
Apply uncrustify changes to .c/.h files in the MdeModulePkg package
Cc: Andrew Fish <afish@apple.com>
Cc: Leif Lindholm <leif@nuviainc.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>
Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>
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https://bugzilla.tianocore.org/show_bug.cgi?id=1373
Replace BSD 2-Clause License with BSD+Patent License. This change is
based on the following emails:
https://lists.01.org/pipermail/edk2-devel/2019-February/036260.html
https://lists.01.org/pipermail/edk2-devel/2018-October/030385.html
RFCs with detailed process for the license change:
V3: https://lists.01.org/pipermail/edk2-devel/2019-March/038116.html
V2: https://lists.01.org/pipermail/edk2-devel/2019-March/037669.html
V1: https://lists.01.org/pipermail/edk2-devel/2019-March/037500.html
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
Reviewed-by: Hao Wu <hao.a.wu@intel.com>
Reviewed-by: Jian J Wang <jian.j.wang@intel.com>
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In a CloseEvent, an UnregisterProtocolNotify is done unconditionally.
There is a penalty associated with searching the protocol database on
every CloseEvent and impacts performance, especially during Network IO.
Unregister needs to be done only if the Event is for a RegisterProtocolNotify.
So extend the ExFlag in IEVENT to a UINT8 and define new flags that can
be set to indicate if the Event is part of a group, or registered on a
protocol notify. Then in CloseEvent, call UnregisterProtocolNotify only
if the register protocol notify flag is set.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Samer El-Haj-Mahmoud <samer.el-haj-mahmoud@hpe.com>
Reviewed-by: Feng Tian <feng.tian@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18517 6f19259b-4bc3-4df7-8a09-765794883524
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git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@10420 6f19259b-4bc3-4df7-8a09-765794883524
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git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@9793 6f19259b-4bc3-4df7-8a09-765794883524
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EFI_SIGNATURE_16 -> SIGNATURE_16
EFI_SIGNATURE_32 -> SIGNATURE_32
EFI_SIGNATURE_64 -> SIGNATURE_64
EFI_FIELD_OFFSET -> OFFSET_OF
EFI_MAX_BIT -> MAX_BIT
EFI_MAX_ADDRESS -> MAX_ADDRESS
These macros are not defined in UEFI spec. It makes more sense to use the equivalent macros in Base.h to avoid alias.
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@7056 6f19259b-4bc3-4df7-8a09-765794883524
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corresponding sub-module directories. It is used to provide good modularity.
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@5949 6f19259b-4bc3-4df7-8a09-765794883524
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