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https://github.com/tianocore/edk2
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7835e5802a
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>
242 lines
6 KiB
C
242 lines
6 KiB
C
/** @file
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Declaration of internal functions for Base Memory Library.
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The following BaseMemoryLib instances contain the same copy of this file:
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BaseMemoryLib
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BaseMemoryLibMmx
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BaseMemoryLibSse2
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BaseMemoryLibRepStr
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BaseMemoryLibOptDxe
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BaseMemoryLibOptPei
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Copyright (c) 2006 - 2016, 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 <Base.h>
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#include <Library/BaseMemoryLib.h>
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#include <Library/BaseLib.h>
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#include <Library/DebugLib.h>
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/**
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Copy Length bytes from Source to Destination.
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@param DestinationBuffer Target of copy
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@param SourceBuffer Place to copy from
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@param Length The number of bytes to copy
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@return Destination
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**/
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VOID *
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EFIAPI
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InternalMemCopyMem (
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OUT VOID *DestinationBuffer,
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IN CONST VOID *SourceBuffer,
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IN UINTN Length
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);
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/**
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Set Buffer to Value for Size bytes.
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@param Buffer The memory to set.
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@param Length The number of bytes to set
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@param Value The value of the set operation.
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@return Buffer
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**/
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VOID *
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EFIAPI
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InternalMemSetMem (
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OUT VOID *Buffer,
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IN UINTN Length,
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IN UINT8 Value
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);
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/**
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Fills a target buffer with a 16-bit value, and returns the target buffer.
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@param Buffer The pointer to the target buffer to fill.
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@param Length The count of 16-bit value to fill.
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@param Value The value with which to fill Length bytes of Buffer.
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@return Buffer
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**/
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VOID *
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EFIAPI
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InternalMemSetMem16 (
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OUT VOID *Buffer,
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IN UINTN Length,
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IN UINT16 Value
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);
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/**
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Fills a target buffer with a 32-bit value, and returns the target buffer.
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@param Buffer The pointer to the target buffer to fill.
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@param Length The count of 32-bit value to fill.
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@param Value The value with which to fill Length bytes of Buffer.
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@return Buffer
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**/
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VOID *
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EFIAPI
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InternalMemSetMem32 (
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OUT VOID *Buffer,
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IN UINTN Length,
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IN UINT32 Value
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);
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/**
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Fills a target buffer with a 64-bit value, and returns the target buffer.
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@param Buffer The pointer to the target buffer to fill.
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@param Length The count of 64-bit value to fill.
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@param Value The value with which to fill Length bytes of Buffer.
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@return Buffer
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**/
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VOID *
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EFIAPI
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InternalMemSetMem64 (
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OUT VOID *Buffer,
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IN UINTN Length,
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IN UINT64 Value
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);
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/**
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Set Buffer to 0 for Size bytes.
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@param Buffer The memory to set.
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@param Length The number of bytes to set.
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@return Buffer
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**/
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VOID *
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EFIAPI
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InternalMemZeroMem (
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OUT VOID *Buffer,
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IN UINTN Length
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);
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/**
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Compares two memory buffers of a given length.
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@param DestinationBuffer The first memory buffer.
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@param SourceBuffer The second memory buffer.
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@param Length The length of DestinationBuffer and SourceBuffer memory
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regions to compare. Must be non-zero.
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@return 0 All Length bytes of the two buffers are identical.
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@retval Non-zero The first mismatched byte in SourceBuffer subtracted from the first
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mismatched byte in DestinationBuffer.
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**/
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INTN
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EFIAPI
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InternalMemCompareMem (
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IN CONST VOID *DestinationBuffer,
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IN CONST VOID *SourceBuffer,
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IN UINTN Length
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);
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/**
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Scans a target buffer for an 8-bit value, and returns a pointer to the
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matching 8-bit value in the target buffer.
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@param Buffer The pointer to the target buffer to scan.
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@param Length The count of 8-bit value to scan. Must be non-zero.
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@param Value The value to search for in the target buffer.
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@return The pointer to the first occurrence, or NULL if not found.
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**/
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CONST VOID *
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EFIAPI
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InternalMemScanMem8 (
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IN CONST VOID *Buffer,
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IN UINTN Length,
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IN UINT8 Value
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);
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/**
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Scans a target buffer for a 16-bit value, and returns a pointer to the
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matching 16-bit value in the target buffer.
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@param Buffer The pointer to the target buffer to scan.
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@param Length The count of 16-bit value to scan. Must be non-zero.
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@param Value The value to search for in the target buffer.
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@return The pointer to the first occurrence, or NULL if not found.
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**/
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CONST VOID *
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EFIAPI
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InternalMemScanMem16 (
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IN CONST VOID *Buffer,
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IN UINTN Length,
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IN UINT16 Value
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);
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/**
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Scans a target buffer for a 32-bit value, and returns a pointer to the
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matching 32-bit value in the target buffer.
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@param Buffer The pointer to the target buffer to scan.
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@param Length The count of 32-bit value to scan. Must be non-zero.
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@param Value The value to search for in the target buffer.
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@return The pointer to the first occurrence, or NULL if not found.
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**/
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CONST VOID *
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EFIAPI
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InternalMemScanMem32 (
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IN CONST VOID *Buffer,
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IN UINTN Length,
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IN UINT32 Value
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);
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/**
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Scans a target buffer for a 64-bit value, and returns a pointer to the
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matching 64-bit value in the target buffer.
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@param Buffer The pointer to the target buffer to scan.
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@param Length The count of 64-bit value to scan. Must be non-zero.
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@param Value The value to search for in the target buffer.
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@return The pointer to the first occurrence, or NULL if not found.
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**/
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CONST VOID *
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EFIAPI
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InternalMemScanMem64 (
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IN CONST VOID *Buffer,
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IN UINTN Length,
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IN UINT64 Value
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);
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/**
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Checks whether the contents of a buffer are all zeros.
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@param Buffer The pointer to the buffer to be checked.
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@param Length The size of the buffer (in bytes) to be checked.
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@retval TRUE Contents of the buffer are all zeros.
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@retval FALSE Contents of the buffer are not all zeros.
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**/
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BOOLEAN
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EFIAPI
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InternalMemIsZeroBuffer (
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IN CONST VOID *Buffer,
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IN UINTN Length
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);
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