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> On Jul 14, 2021, at 10:15 PM, Andrew Fish <af...@apple.com> wrote:
>
> I’ve been watching the Le Tour replays and playing around with gdb scripts. I
> was trying to figure out how to do stuff I know how to do in lldb.
>
> For lldb I have Pretty Printer and for CHAR16 things like this:
>
> CHAR16 gChar = L'X';
> CHAR16 gStr[] = L"1234567890\x23f3";
> CHAR16 *gStrPtr = gStr;
>
> For lldb I get:
> L’X’
> L”1234567890⏳”
> (CHAR16 *)L”1234567890⏳”
>
> The default for gdb is:
> (gdb) p /r gChar
> $8 = 88
> (gdb) p /r gStr
> $9 = {49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 9203, 0}
> (gdb) p /r gStrPtr
> $10 = (CHAR16 *) 0x100008030 <gStr>
>
> I’ve figured out how to teach GDB to pretty print CHAR16, but I can’t figure
> out how to hook CHAR16 * or CHAR16 {}?
>
> This is what I’ve got (vs what gdb does for char):
> $1 = 88 'X'
> $2 = L'X'
>
> $3 = "1234567890"
> $4 = {L'1', L'2', L'3', L'4', L'5', L'6', L'7', L'8', L'9', L'0', L'⏳',
> L'\x00'}
>
> $5 = 0x100008058 <Str> "1234567890"
> $6 = (CHAR16 *) 0x100008030 <gStr>
>
> This is the script...
> $ cat CHAR16.py
> import gdb
>
> from gdb.printing import register_pretty_printer
> from gdb.printing import RegexpCollectionPrettyPrinter
>
>
> class CHAR16_PrettyPrinter(object):
>
> def __init__(self, val):
> self.val = val
>
> def to_string(self):
> if int(self.val) < 0x20:
> return f"L'\\x{int(self.val):02x}'"
> else:
> return f"L'{chr(self.val):s}'"
>
>
> def build_pretty_printer():
> pp = RegexpCollectionPrettyPrinter("EFI")
> pp.add_printer('CHAR16', '^CHAR16$', CHAR16_PrettyPrinter)
> return pp
>
>
> register_pretty_printer(None, build_pretty_printer(), replace=True)
>
> $ cat CHAR16.c
> #include <stdio.h>
>
> ///
> /// 2-byte Character. Unless otherwise specified all strings are stored in
> the
> /// UTF-16 encoding format as defined by Unicode 2.1 and ISO/IEC 10646
> standards.
> ///
> typedef unsigned short CHAR16;
>
> CHAR16 gChar = L'X';
> CHAR16 gChar2 = L'\x23f3';
> CHAR16 gStr[] = L"1234567890\x23f3";
> CHAR16 *gStrPtr = gStr;
>
> char Char = 'X';
> char Str[] = "1234567890";
> char *StrPtr = Str;
>
> int
> main(int argc, char **argv)
> {
> printf ("hello world!\n");
> return 0;
> }
>
> $ cat CHAR16.sh
> gcc -fshort-wchar -g CHAR16.c
> gdb -ex "source CHAR16.py" -ex "p Char" -ex "p gChar" -ex "shell echo ' '"
> -ex "p Str" -ex "p gStr" -ex "shell echo ' '" -ex "p StrPtr" -ex "p gStrPtr”
>
> Given the above example you should be able to experiment with just the code
> in this email to figure out how to get CHAR16 working. No edk2 or EFI
> knowledge required, in case you have a friend who is good with gdb pretty
> print?
>
> If you have CHAR16.sh, CHAR16.c, and CHAR16.py you can just run ./CHAR16.sh
> and it will print out the results for char and CHAR16 if you modify the
> CHAR16.py gdb Python script it will show you the results.
>
> Thanks,
>
> Andrew Fish
>
>
> <CHAR16.py>
> <CHAR16.c>
> <CHAR16.sh>
>
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