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MdePkg: add RETURNS_TWICE attribute 

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Michael Zimmermann <sigmaepsilon92@gmail.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
This commit is contained in:
M1cha 2017-12-28 03:28:49 +08:00 committed by Liming Gao
parent c7c5a6c4f7
commit 2d94c38ba5
1 changed files with 20 additions and 0 deletions
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20
MdePkg/Include/Base.h
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@ -218,6 +218,26 @@ VERIFY_SIZE_OF (__VERIFY_UINT32_ENUM_SIZE, 4);
#endif
#endif
///
/// Tell the code optimizer that the function will return twice.
/// This prevents wrong optimizations which can cause bugs.
///
#ifndef RETURNS_TWICE
#if defined (__GNUC__) || defined (__clang__)
///
/// Tell the code optimizer that the function will return twice.
/// This prevents wrong optimizations which can cause bugs.
///
#define RETURNS_TWICE __attribute__((returns_twice))
#else
///
/// Tell the code optimizer that the function will return twice.
/// This prevents wrong optimizations which can cause bugs.
///
#define RETURNS_TWICE
#endif
#endif
//
// For symbol name in assembly code, an extra "_" is sometimes necessary
//