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22454f1042
There are cases that the operands of an expression are all with rank less
than UINT64/INT64 and the result of the expression is explicitly cast to
UINT64/INT64 to fit the target size.
An example will be:
UINT32 a,b;
// a and b can be any unsigned int type with rank less than UINT64, like
// UINT8, UINT16, etc.
UINT64 c;
c = (UINT64) (a + b);
Some static code checkers may warn that the expression result might
overflow within the rank of "int" (integer promotions) and the result is
then cast to a bigger size.
The commit refines codes by the following rules:
1). When the expression is possible to overflow the range of unsigned int/
int:
c = (UINT64)a + b;
2). When the expression will not overflow within the rank of "int", remove
the explicit type casts:
c = a + b;
3). When the expression will be cast to pointer of possible greater size:
UINT32 a,b;
VOID *c;
c = (VOID *)(UINTN)(a + b); --> c = (VOID *)((UINTN)a + b);
4). When one side of a comparison expression contains only operands with
rank less than UINT32:
UINT8 a;
UINT16 b;
UINTN c;
if ((UINTN)(a + b) > c) {...} --> if (((UINT32)a + b) > c) {...}
For rule 4), if we remove the 'UINTN' type cast like:
if (a + b > c) {...}
The VS compiler will complain with warning C4018 (signed/unsigned
mismatch, level 3 warning) due to promoting 'a + b' to type 'int'.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Hao Wu <hao.a.wu@intel.com>
Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Jaben Carsey <jaben.carsey@intel.com>
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| .. | ||
| Edit | ||
| HexEdit | ||
| SmbiosView | ||
| Comp.c | ||
| Compress.c | ||
| Compress.h | ||
| Dblk.c | ||
| Dmem.c | ||
| DmpStore.c | ||
| EditInputBar.c | ||
| EditInputBar.h | ||
| EditMenuBar.c | ||
| EditMenuBar.h | ||
| EditStatusBar.c | ||
| EditStatusBar.h | ||
| EditTitleBar.c | ||
| EditTitleBar.h | ||
| EfiCompress.c | ||
| EfiDecompress.c | ||
| LoadPciRom.c | ||
| MemMap.c | ||
| Mm.c | ||
| Mode.c | ||
| Pci.c | ||
| Pci.h | ||
| SerMode.c | ||
| SetSize.c | ||
| SetVar.c | ||
| UefiShellDebug1CommandsLib.c | ||
| UefiShellDebug1CommandsLib.h | ||
| UefiShellDebug1CommandsLib.inf | ||
| UefiShellDebug1CommandsLib.uni | ||