Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Michael Zimmermann <sigmaepsilo...@gmail.com> --- V3: add code comments
MdePkg/Include/Base.h | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/MdePkg/Include/Base.h b/MdePkg/Include/Base.h index 22ab5d3715fb..8c7345609ed5 100644 --- a/MdePkg/Include/Base.h +++ b/MdePkg/Include/Base.h @@ -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 // -- 2.15.1 _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel
