diff mbox series

[3/5] decodetree: Allow custom var width load functions

Message ID 20210413211129.457272-4-luis.pires@eldorado.org.br
State New
Headers show
Series Base for adding PowerPC 64-bit instructions | expand

Commit Message

Luis Fernando Fujita Pires April 13, 2021, 9:11 p.m. UTC 
This is useful in situations where you want decodetree
to handle variable width instructions but you want to
provide custom code to load the instructions. Suppressing
the generation of the load function is necessary to avoid
compilation errors due to the load function being unused.

This will be used by the PowerPC decodetree code.

Signed-off-by: Luis Pires <luis.pires@eldorado.org.br>
---
 scripts/decodetree.py | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)
diff mbox series

Patch

diff --git a/scripts/decodetree.py b/scripts/decodetree.py
index 935b2964e0..a62b8d8d76 100644
--- a/scripts/decodetree.py
+++ b/scripts/decodetree.py
@@ -1278,9 +1278,10 @@  def main():
     global anyextern
 
     decode_scope = 'static '
+    noloadfunc = False
 
     long_opts = ['decode=', 'translate=', 'output=', 'insnwidth=',
-                 'static-decode=', 'varinsnwidth=']
+                 'static-decode=', 'varinsnwidth=', 'noloadfunc']
     try:
         (opts, args) = getopt.gnu_getopt(sys.argv[1:], 'o:vw:', long_opts)
     except getopt.GetoptError as err:
@@ -1312,6 +1313,8 @@  def main():
                 deposit_function = 'deposit64'
             elif insnwidth != 32:
                 error(0, 'cannot handle insns of width', insnwidth)
+        elif o == '--noloadfunc':
+            noloadfunc = True
         else:
             assert False, 'unhandled option'
 
@@ -1401,12 +1404,13 @@  def main():
     output(i4, 'return false;\n')
     output('}\n')
 
-    if variablewidth:
-        output('\n', decode_scope, insntype, ' ', decode_function,
-               '_load(DisasContext *ctx)\n{\n',
-               '    ', insntype, ' insn = 0;\n\n')
-        stree.output_code(4, 0, 0, 0)
-        output('}\n')
+    if not noloadfunc:
+        if variablewidth:
+            output('\n', decode_scope, insntype, ' ', decode_function,
+                   '_load(DisasContext *ctx)\n{\n',
+                   '    ', insntype, ' insn = 0;\n\n')
+            stree.output_code(4, 0, 0, 0)
+            output('}\n')
 
     if output_file:
         output_fd.close()