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Michael Kubackiandmergify[bot]
7a934d0bef
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>
47 lines
1.4 KiB
C
47 lines
1.4 KiB
C
/** @file
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EDK II Firmware Management Progress Protocol.
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Copyright (c) 2018, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#pragma once
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#include <Protocol/GraphicsOutput.h>
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///
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/// EDK II Firmware Management Progress Protocol GUID value
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///
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#define EDKII_FIRMWARE_MANAGEMENT_PROGRESS_PROTOCOL_GUID \
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{ \
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0x1849bda2, 0x6952, 0x4e86, { 0xa1, 0xdb, 0x55, 0x9a, 0x3c, 0x47, 0x9d, 0xf1 } \
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}
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///
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/// EDK II Firmware Management Progress Protocol structure
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///
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typedef struct {
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///
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/// The version of this structure. Initial version value is 0x00000001.
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///
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UINT32 Version;
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///
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/// The foreground color of a progress bar that is used by the Progress()
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/// function that is passed into the Firmware Management Protocol SetImage()
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/// service is called.
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///
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EFI_GRAPHICS_OUTPUT_BLT_PIXEL_UNION ProgressBarForegroundColor;
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///
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/// The time in seconds to arm the watchdog timer each time the Progress()
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/// function passed into the Firmware Management Protocol SetImage() service
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/// is called.
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///
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UINTN WatchdogSeconds;
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} EDKII_FIRMWARE_MANAGEMENT_PROGRESS_PROTOCOL;
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///
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/// EDK II Firmware Management Progress Protocol GUID variable.
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///
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extern EFI_GUID gEdkiiFirmwareManagementProgressProtocolGuid;
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