modules: collect module meta-data

Add script to collect the module meta-data from the source code,
store the results in *.modinfo files.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Jose R. Ziviani <jziviani@suse.de>
Message-Id: <20210624103836.2382472-3-kraxel@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

meson.build

@@ -2241,6 +2241,9 @@ subdir('tests/qtest/fuzz')
 # Library dependencies #
 ########################
 
+modinfo_collect = find_program('scripts/modinfo-collect.py')
+modinfo_files = []
+
 block_mods = []
 softmmu_mods = []
 foreach d, list : modules
@@ -2254,6 +2257,19 @@ foreach d, list : modules
       else
         softmmu_mods += sl
       endif
+      if module_ss.sources() != []
+        # FIXME: Should use sl.extract_all_objects(recursive: true) as
+        # input. Sources can be used multiple times but objects are
+        # unique when it comes to lookup in compile_commands.json.
+        # Depnds on a mesion version with
+        # https://github.com/mesonbuild/meson/pull/8900
+        modinfo_files += custom_target(d + '-' + m + '.modinfo',
+                                       output: d + '-' + m + '.modinfo',
+                                       input: module_ss.sources(),
+                                       capture: true,
+                                       build_by_default: true, # to be removed when added to a target
+                                       command: [modinfo_collect, '@INPUT@'])
+      endif
     else
       if d == 'block'
         block_ss.add_all(module_ss)

scripts/modinfo-collect.py

+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+import os
+import sys
+import json
+import shlex
+import subprocess
+
+def find_command(src, target, compile_commands):
+    for command in compile_commands:
+        if command['file'] != src:
+            continue
+        if target != '' and command['command'].find(target) == -1:
+            continue
+        return command['command']
+    return 'false'
+
+def process_command(src, command):
+    skip = False
+    arg = False
+    out = []
+    for item in shlex.split(command):
+        if arg:
+            out.append(x)
+            arg = False
+            continue
+        if skip:
+            skip = False
+            continue
+        if item == '-MF' or item == '-MQ' or item == '-o':
+            skip = True
+            continue
+        if item == '-c':
+            skip = True
+            continue
+        out.append(item)
+    out.append('-DQEMU_MODINFO')
+    out.append('-E')
+    out.append(src)
+    return out
+
+def main(args):
+    target = ''
+    if args[0] == '--target':
+        args.pop(0)
+        target = args.pop(0)
+        print("MODINFO_DEBUG target %s" % target)
+        arch = target[:-8] # cut '-softmmu'
+        print("MODINFO_START arch \"%s\" MODINFO_END" % arch)
+    with open('compile_commands.json') as f:
+        compile_commands = json.load(f)
+    for src in args:
+        print("MODINFO_DEBUG src %s" % src)
+        command = find_command(src, target, compile_commands)
+        cmdline = process_command(src, command)
+        print("MODINFO_DEBUG cmd", cmdline)
+        result = subprocess.run(cmdline, stdout = subprocess.PIPE,
+                                universal_newlines = True)
+        if result.returncode != 0:
+            sys.exit(result.returncode)
+        for line in result.stdout.split('\n'):
+            if line.find('MODINFO') != -1:
+                print(line)
+
+if __name__ == "__main__":
+    main(sys.argv[1:])