gen_compile_db.py: add script

gen_compile_db.py

@@ -0,0 +1,74 @@
+#!/usr/bin/env python3
+# Generates a compile_commands.json file for the kernel
+
+import os
+import pathlib
+import json
+
+path = pathlib.Path(__file__).resolve()
+kernel_source = path.parent / 'kernel-src'
+cflags = []
+
+with open(kernel_source / 'Makefile', 'r') as f:
+    lines = f.readlines()
+
+    def find_var(name):
+        line = next(x for x in lines if x.startswith(f'{name}='))
+        value = line.strip().split('=', 1)[1].strip()
+
+        # Handle comment
+        if '#' in value:
+            value = value.split('#', 1)[0].strip()
+
+        return value
+
+    cflags_var = find_var('CFLAGS').split()
+    uacpiopts_var = find_var('UACPIOPTS').split()
+    printfopts_var = find_var('PRINTFOPTS').split()
+    kernelconfig_var = find_var('KERNELCONFIG').split()
+    flantermopts_var = find_var('FLANTERMOPTS').split()
+
+    incdir = kernel_source / 'include'
+    archincdir = kernel_source / 'include' / 'x86-64'
+    flantermincdir = kernel_source / 'flanterm'
+    uacpiincdir = kernel_source / 'io' / 'acpi' / 'uacpi' / 'include'
+
+    for f in cflags_var:
+        if f == '"$(UACPIINCDIR)"':
+            cflags.append(str(uacpiincdir))
+        elif f == '"$(INCDIR)"':
+            cflags.append(str(incdir))
+        elif f == '"$(ARCHINCDIR)"':
+            cflags.append(str(archincdir))
+        elif f == '"$(FLANTERMINCDIR)"':
+            cflags.append(str(flantermincdir))
+        elif f == '$(UACPIOPTS)':
+            cflags.extend(uacpiopts_var)
+        elif f == '$(PRINTFOPTS)':
+            cflags.extend(printfopts_var)
+        elif f == '$(KERNELCONFIG)':
+            cflags.extend(kernelconfig_var)
+        elif f == '$(FLANTERMOPTS)':
+            cflags.extend(flantermopts_var)
+        else:
+            cflags.append(f)
+
+csources = [
+    os.path.join(root, f)
+    for root, _, files in os.walk(kernel_source)
+    for f in files
+    if f.endswith('.c') and '/uacpi/tests/' not in os.path.join(root, f)
+]
+
+compile_commands = []
+
+for src in csources:
+    command = {
+        'directory': str(kernel_source),
+        'arguments': ['gcc', *cflags, '-c', src],
+        'file': src
+    }
+    compile_commands.append(command)
+
+with open(kernel_source / 'compile_commands.json', 'w') as f:
+    json.dump(compile_commands, f, indent=2)