sravan/system76-edk2
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

IntelFrameworkModulePkg: Refine casting expression result to bigger size

Browse Source 
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: Jeff Fan <jeff.fan@intel.com>
This commit is contained in:
Hao Wu
2017-01-23 11:24:50 +08:00
parent 64b25f5db1
commit aa5f60ae41
11 changed files with 25 additions and 25 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
IntelFrameworkModulePkg/Csm/BiosThunk/Snp16Dxe/BiosSnp16.c
View File

@@ -1,6 +1,6 @@
/** @file
Copyright (c) 1999 - 2014, Intel Corporation. All rights reserved.<BR>
Copyright (c) 1999 - 2017, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions
@@ -1858,7 +1858,7 @@ Undi16SimpleNetworkIsr (
CopyMem (
Frame,
(VOID *)(UINTN) ((SimpleNetworkDevice->Isr.FrameSegSel << 4) + SimpleNetworkDevice->Isr.FrameOffset),
(VOID *) (((UINTN) SimpleNetworkDevice->Isr.FrameSegSel << 4) + SimpleNetworkDevice->Isr.FrameOffset),
SimpleNetworkDevice->Isr.BufferLength
);
Frame = Frame + SimpleNetworkDevice->Isr.BufferLength;