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Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Liming Gao <liming.gao@intel.com>
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: Laszlo Ersek <lersek@redhat.com>
Update comments in PeiMemoryAllocationLib and UefiMemoryAllocationLib to match updates to MemoryAllocationLib.h.
Add ASSERT() statements in PeiMemoryAllocationLib for the FreePages() and FreeAlignedPages() if Pages is 0.
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@8275 6f19259b-4bc3-4df7-8a09-765794883524
Fix bug in Reallocate Pool functions in PEI Memory Allocation Lib. The wrong memory type was being allocated. This syncs the PEI Memory Allocation Lib with the fix that was previously made to the UEFI Memory Allocation Lib.
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@8269 6f19259b-4bc3-4df7-8a09-765794883524
Michael D Kinney
Liming Gao
Hao Wu
Qiu Shumin
myronporter
hhtian
qhuang8
mdkinney
xli24
jji4
gikidy
qwang12