Re: [PATCH V4 08/17] ArmPkg/SemiHostingDebugLib: Add new APIs

["Gao, Zhichao" <zhichao.gao@intel.com>]

Thanks for your reply.
The variable "mVaListNull" I prefer to keep it as a module data even though there is only one source file in this DebugLib inf.

Thanks,
Zhichao

> -----Original Message-----
> From: Leif Lindholm [mailto:leif.lindholm@linaro.org]
> Sent: Tuesday, March 26, 2019 8:19 PM
> To: Gao, Zhichao <zhichao.gao@intel.com>
> Cc: edk2-devel@lists.01.org; Ard Biesheuvel <ard.biesheuvel@linaro.org>;
> Gao, Liming <liming.gao@intel.com>; Sean Brogan
> <sean.brogan@microsoft.com>; Michael Turner
> <Michael.Turner@microsoft.com>; Bret Barkelew
> <Bret.Barkelew@microsoft.com>
> Subject: Re: [PATCH V4 08/17] ArmPkg/SemiHostingDebugLib: Add new APIs
> 
> Hi Zhichao,
> 
> Apologies for delay in responding, due to holiday and stuff.
> 
> On the whole this looks fine (one comment below), but I don't actually have
> any platform on which to test this.
> 
> Ard: maybe it's time to retire this component?
> 
> On Thu, Mar 21, 2019 at 10:04:50PM +0800, Zhichao Gao wrote:
> > REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1395
> >
> > Add new APIs' implementation (DebugVPrint, DebugBPrint) in the
> > DebugLib instance. These APIs would expose print routines with VaList
> > parameter and BaseList parameter.
> >
> > Contributed-under: TianoCore Contribution Agreement 1.1
> > Signed-off-by: Zhichao Gao <zhichao.gao@intel.com>
> > Cc: Leif Lindholm <leif.lindholm@linaro.org>
> > Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
> > Cc: Liming Gao <liming.gao@intel.com>
> > Cc: Sean Brogan <sean.brogan@microsoft.com>
> > Cc: Michael Turner <Michael.Turner@microsoft.com>
> > Cc: Bret Barkelew <Bret.Barkelew@microsoft.com>
> > ---
> >  ArmPkg/Library/SemiHostingDebugLib/DebugLib.c | 106
> > ++++++++++++++++++++++++--
> >  1 file changed, 101 insertions(+), 5 deletions(-)
> >
> > diff --git a/ArmPkg/Library/SemiHostingDebugLib/DebugLib.c
> > b/ArmPkg/Library/SemiHostingDebugLib/DebugLib.c
> > index ec03edb774..a368dd43b8 100644
> > --- a/ArmPkg/Library/SemiHostingDebugLib/DebugLib.c
> > +++ b/ArmPkg/Library/SemiHostingDebugLib/DebugLib.c
> > @@ -1,7 +1,7 @@
> >  /** @file
> >    UEFI Debug Library that uses PrintLib to send messages to STDERR.
> >
> > -  Copyright (c) 2006 - 2007, Intel Corporation. All rights
> > reserved.<BR>
> > +  Copyright (c) 2006 - 2019, Intel Corporation. All rights
> > + reserved.<BR>
> >    Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
> >    This program and the accompanying materials
> >    are licensed and made available under the terms and conditions of
> > the BSD License @@ -27,6 +27,12 @@  //  #define
> > MAX_DEBUG_MESSAGE_LENGTH  0x100
> >
> > +//
> > +// VA_LIST can not initialize to NULL for all compiler, so we use
> > +this to // indicate a null VA_LIST //
> > +VA_LIST     mVaListNull;
> 
> I would prefer if this was marked STATIC.
> 
> If you feel strongly otherwise, leave it as is.
> Either way:
> Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>
> 
> /
>     Leif
> 
> > +
> >  /**
> >
> >    Prints a debug message to the debug output device if the specified error
> level is enabled.
> > @@ -48,9 +54,41 @@ DebugPrint (
> >    IN  CONST CHAR8  *Format,
> >    ...
> >    )
> > +{
> > +  VA_LIST         Marker;
> > +
> > +  VA_START (Marker, Format);
> > +  DebugVPrint (ErrorLevel, Format, Marker);
> > +  VA_END (Marker);
> > +}
> > +
> > +
> > +/**
> > +  Prints a debug message to the debug output device if the specified
> > +  error level is enabled base on Null-terminated format string and a
> > +  VA_LIST argument list or a BASE_LIST argument list.
> > +
> > +  If any bit in ErrorLevel is also set in DebugPrintErrorLevelLib
> > + function  GetDebugPrintErrorLevel (), then print the message
> > + specified by Format and  the associated variable argument list to the
> debug output device.
> > +
> > +  If Format is NULL, then ASSERT().
> > +
> > +  @param  ErrorLevel      The error level of the debug message.
> > +  @param  Format          Format string for the debug message to print.
> > +  @param  VaListMarker    VA_LIST marker for the variable argument list.
> > +  @param  BaseListMarker  BASE_LIST marker for the variable argument
> list.
> > +
> > +**/
> > +VOID
> > +DebugPrintMarker (
> > +  IN  UINTN         ErrorLevel,
> > +  IN  CONST CHAR8   *Format,
> > +  IN  VA_LIST       VaListMarker,
> > +  IN  BASE_LIST     BaseListMarker
> > +  )
> >  {
> >    CHAR8    AsciiBuffer[MAX_DEBUG_MESSAGE_LENGTH];
> > -  VA_LIST  Marker;
> >
> >    //
> >    // If Format is NULL, then ASSERT().
> > @@ -67,14 +105,72 @@ DebugPrint (
> >    //
> >    // Convert the DEBUG() message to a Unicode String
> >    //
> > -  VA_START (Marker, Format);
> > -  AsciiVSPrint (AsciiBuffer, sizeof (AsciiBuffer), Format, Marker);
> > -  VA_END (Marker);
> > +  if (BaseListMarker == NULL) {
> > +    AsciiVSPrint (AsciiBuffer, sizeof (AsciiBuffer), Format,
> > + VaListMarker);  } else {
> > +    AsciiBSPrint (AsciiBuffer, sizeof (AsciiBuffer), Format,
> > + BaseListMarker);  }
> >
> >    SemihostWriteString (AsciiBuffer);
> >  }
> >
> >
> > +/**
> > +  Prints a debug message to the debug output device if the specified
> > +  error level is enabled.
> > +
> > +  If any bit in ErrorLevel is also set in DebugPrintErrorLevelLib
> > + function  GetDebugPrintErrorLevel (), then print the message
> > + specified by Format and  the associated variable argument list to the
> debug output device.
> > +
> > +  If Format is NULL, then ASSERT().
> > +
> > +  @param  ErrorLevel    The error level of the debug message.
> > +  @param  Format        Format string for the debug message to print.
> > +  @param  VaListMarker  VA_LIST marker for the variable argument list.
> > +
> > +**/
> > +VOID
> > +EFIAPI
> > +DebugVPrint (
> > +  IN  UINTN         ErrorLevel,
> > +  IN  CONST CHAR8   *Format,
> > +  IN  VA_LIST       VaListMarker
> > +  )
> > +{
> > +  DebugPrintMarker (ErrorLevel, Format, VaListMarker, NULL); }
> > +
> > +
> > +/**
> > +  Prints a debug message to the debug output device if the specified
> > +  error level is enabled.
> > +  This function use BASE_LIST which would provide a more compatible
> > +  service than VA_LIST.
> > +
> > +  If any bit in ErrorLevel is also set in DebugPrintErrorLevelLib
> > + function  GetDebugPrintErrorLevel (), then print the message
> > + specified by Format and  the associated variable argument list to the
> debug output device.
> > +
> > +  If Format is NULL, then ASSERT().
> > +
> > +  @param  ErrorLevel      The error level of the debug message.
> > +  @param  Format          Format string for the debug message to print.
> > +  @param  BaseListMarker  BASE_LIST marker for the variable argument
> list.
> > +
> > +**/
> > +VOID
> > +EFIAPI
> > +DebugBPrint (
> > +  IN  UINTN         ErrorLevel,
> > +  IN  CONST CHAR8   *Format,
> > +  IN  BASE_LIST     BaseListMarker
> > +  )
> > +{
> > +  DebugPrintMarker (ErrorLevel, Format, mVaListNull, BaseListMarker);
> > +}
> > +
> > +
> >  /**
> >
> >    Prints an assert message containing a filename, line number, and
> description.
> > --
> > 2.16.2.windows.1
> >