Switch kernel header parsing to python libclang

Replace the tokenizer in cpp.py with libclang.

Bug: 18937958
Change-Id: I27630904c6d2849418cd5ca3d3c612ec3078686d
diff --git a/libc/kernel/uapi/linux/swab.h b/libc/kernel/uapi/linux/swab.h
index 8be85a8..d7d6fa6 100644
--- a/libc/kernel/uapi/linux/swab.h
+++ b/libc/kernel/uapi/linux/swab.h
@@ -22,14 +22,14 @@
 #include <linux/compiler.h>
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #include <asm/swab.h>
-#define ___constant_swab16(x) ((__u16)(   (((__u16)(x) & (__u16)0x00ffU) << 8) |   (((__u16)(x) & (__u16)0xff00U) >> 8)))
-#define ___constant_swab32(x) ((__u32)(   (((__u32)(x) & (__u32)0x000000ffUL) << 24) |   (((__u32)(x) & (__u32)0x0000ff00UL) << 8) |   (((__u32)(x) & (__u32)0x00ff0000UL) >> 8) |   (((__u32)(x) & (__u32)0xff000000UL) >> 24)))
-#define ___constant_swab64(x) ((__u64)(   (((__u64)(x) & (__u64)0x00000000000000ffULL) << 56) |   (((__u64)(x) & (__u64)0x000000000000ff00ULL) << 40) |   (((__u64)(x) & (__u64)0x0000000000ff0000ULL) << 24) |   (((__u64)(x) & (__u64)0x00000000ff000000ULL) << 8) |   (((__u64)(x) & (__u64)0x000000ff00000000ULL) >> 8) |   (((__u64)(x) & (__u64)0x0000ff0000000000ULL) >> 24) |   (((__u64)(x) & (__u64)0x00ff000000000000ULL) >> 40) |   (((__u64)(x) & (__u64)0xff00000000000000ULL) >> 56)))
+#define ___constant_swab16(x) ((__u16) ((((__u16) (x) & (__u16) 0x00ffU) << 8) | (((__u16) (x) & (__u16) 0xff00U) >> 8)))
+#define ___constant_swab32(x) ((__u32) ((((__u32) (x) & (__u32) 0x000000ffUL) << 24) | (((__u32) (x) & (__u32) 0x0000ff00UL) << 8) | (((__u32) (x) & (__u32) 0x00ff0000UL) >> 8) | (((__u32) (x) & (__u32) 0xff000000UL) >> 24)))
+#define ___constant_swab64(x) ((__u64) ((((__u64) (x) & (__u64) 0x00000000000000ffULL) << 56) | (((__u64) (x) & (__u64) 0x000000000000ff00ULL) << 40) | (((__u64) (x) & (__u64) 0x0000000000ff0000ULL) << 24) | (((__u64) (x) & (__u64) 0x00000000ff000000ULL) << 8) | (((__u64) (x) & (__u64) 0x000000ff00000000ULL) >> 8) | (((__u64) (x) & (__u64) 0x0000ff0000000000ULL) >> 24) | (((__u64) (x) & (__u64) 0x00ff000000000000ULL) >> 40) | (((__u64) (x) & (__u64) 0xff00000000000000ULL) >> 56)))
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
-#define ___constant_swahw32(x) ((__u32)(   (((__u32)(x) & (__u32)0x0000ffffUL) << 16) |   (((__u32)(x) & (__u32)0xffff0000UL) >> 16)))
-#define ___constant_swahb32(x) ((__u32)(   (((__u32)(x) & (__u32)0x00ff00ffUL) << 8) |   (((__u32)(x) & (__u32)0xff00ff00UL) >> 8)))
+#define ___constant_swahw32(x) ((__u32) ((((__u32) (x) & (__u32) 0x0000ffffUL) << 16) | (((__u32) (x) & (__u32) 0xffff0000UL) >> 16)))
+#define ___constant_swahb32(x) ((__u32) ((((__u32) (x) & (__u32) 0x00ff00ffUL) << 8) | (((__u32) (x) & (__u32) 0xff00ff00UL) >> 8)))
 #ifdef __HAVE_BUILTIN_BSWAP16__
-#elif defined (__arch_swab16)
+#elif defined(__arch_swab16)
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #else
 #endif
@@ -39,7 +39,7 @@
 #else
 #endif
 #ifdef __HAVE_BUILTIN_BSWAP64__
-#elif defined (__arch_swab64)
+#elif defined(__arch_swab64)
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #elif defined(__SWAB_64_THRU_32__)
 #else
@@ -52,12 +52,12 @@
 #else
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif
-#define __swab16(x)   (__builtin_constant_p((__u16)(x)) ?   ___constant_swab16(x) :   __fswab16(x))
-#define __swab32(x)   (__builtin_constant_p((__u32)(x)) ?   ___constant_swab32(x) :   __fswab32(x))
-#define __swab64(x)   (__builtin_constant_p((__u64)(x)) ?   ___constant_swab64(x) :   __fswab64(x))
+#define __swab16(x) (__builtin_constant_p((__u16) (x)) ? ___constant_swab16(x) : __fswab16(x))
+#define __swab32(x) (__builtin_constant_p((__u32) (x)) ? ___constant_swab32(x) : __fswab32(x))
+#define __swab64(x) (__builtin_constant_p((__u64) (x)) ? ___constant_swab64(x) : __fswab64(x))
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
-#define __swahw32(x)   (__builtin_constant_p((__u32)(x)) ?   ___constant_swahw32(x) :   __fswahw32(x))
-#define __swahb32(x)   (__builtin_constant_p((__u32)(x)) ?   ___constant_swahb32(x) :   __fswahb32(x))
+#define __swahw32(x) (__builtin_constant_p((__u32) (x)) ? ___constant_swahw32(x) : __fswahw32(x))
+#define __swahb32(x) (__builtin_constant_p((__u32) (x)) ? ___constant_swahb32(x) : __fswahb32(x))
 #ifdef __arch_swab16p
 #else
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */