MdeModulePkg: Refine casting expression result to bigger size

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: Feng Tian <feng.tian@intel.com>

2 files changed, 4 insertions, 4 deletions

diff --git a/MdeModulePkg/Universal/PCD/Dxe/Service.c b/MdeModulePkg/Universal/PCD/Dxe/Service.c
index bf77130170..efe72483c5 100644
--- a/MdeModulePkg/Universal/PCD/Dxe/Service.c
+++ b/MdeModulePkg/Universal/PCD/Dxe/Service.c
@@ -2,7 +2,7 @@
     Help functions used by PCD DXE driver.

 

 Copyright (c) 2014, Hewlett-Packard Development Company, L.P.<BR>

-Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR>

+Copyright (c) 2006 - 2017, Intel Corporation. All rights reserved.<BR>

 (C) Copyright 2016 Hewlett Packard Enterprise Development LP<BR>

 This program and the accompanying materials

 are licensed and made available under the terms and conditions of the BSD License

@@ -452,7 +452,7 @@ GetWorker (
   switch (LocalTokenNumber & PCD_TYPE_ALL_SET) {

     case PCD_TYPE_VPD:

       VpdHead = (VPD_HEAD *) ((UINT8 *) PcdDb + Offset);

-      RetPtr = (VOID *) (UINTN) (PcdGet32 (PcdVpdBaseAddress) + VpdHead->Offset);

+      RetPtr = (VOID *) ((UINTN) PcdGet32 (PcdVpdBaseAddress) + VpdHead->Offset);

 

       break;

 

diff --git a/MdeModulePkg/Universal/PCD/Pei/Service.c b/MdeModulePkg/Universal/PCD/Pei/Service.c
index 66ca892ed2..5e1cb72ba5 100644
--- a/MdeModulePkg/Universal/PCD/Pei/Service.c
+++ b/MdeModulePkg/Universal/PCD/Pei/Service.c
@@ -2,7 +2,7 @@
   The driver internal functions are implmented here.

   They build Pei PCD database, and provide access service to PCD database.

 

-Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR>

+Copyright (c) 2006 - 2017, Intel Corporation. All rights reserved.<BR>

 This program and the accompanying materials

 are licensed and made available under the terms and conditions of the BSD License

 which accompanies this distribution.  The full text of the license may be found at

@@ -985,7 +985,7 @@ GetWorker (
     {

       VPD_HEAD *VpdHead;

       VpdHead = (VPD_HEAD *) ((UINT8 *)PeiPcdDb + Offset);

-      return (VOID *) (UINTN) (PcdGet32 (PcdVpdBaseAddress) + VpdHead->Offset);

+      return (VOID *) ((UINTN) PcdGet32 (PcdVpdBaseAddress) + VpdHead->Offset);

     }

       

     case PCD_TYPE_HII|PCD_TYPE_STRING: