[PATCH v2] decodetree: Allow use of hex/bin format for argument field values

["Philippe Mathieu-Daudé" <f4bug@amsat.org>]

ISA datasheets often use binary or hexadecimal constant values.
By doing base conversion, we might introduce bugs. Safer is to
copy/paste the datasheet value.

To add support for bin/hex constants in argument field token,
extend the re_num_ident regexp and use '0' as radix base when
parsing the integer (to interpret it as a code literal).

Suggested-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
v2: Fix regexp (Richard)
---
 scripts/decodetree.py | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/scripts/decodetree.py b/scripts/decodetree.py
index 47aa9caf6d1..c8136073535 100644
--- a/scripts/decodetree.py
+++ b/scripts/decodetree.py
@@ -50,6 +50,7 @@
 re_fld_ident = '%[a-zA-Z0-9_]*'
 re_fmt_ident = '@[a-zA-Z0-9_]*'
 re_pat_ident = '[a-zA-Z0-9_]*'
+re_num_ident = '[+-]?([0-9]+|0x[0-9a-fA-F]+|0b[01]+)'
 
 def error_with_file(file, lineno, *args):
     """Print an error message from file:line and args and exit."""
@@ -849,9 +850,9 @@ def parse_generic(lineno, parent_pat, name, toks):
             continue
 
         # 'Foo=number' sets an argument field to a constant value
-        if re.fullmatch(re_C_ident + '=[+-]?[0-9]+', t):
+        if re.fullmatch(re_C_ident + '=' + re_num_ident, t):
             (fname, value) = t.split('=')
-            value = int(value)
+            value = int(value, 0)
             flds = add_field(lineno, flds, fname, ConstField(value))
             continue
 
-- 
2.26.2