serde: add [de]serialization for bindings

* use #[derive(Serialize,Deserialize)] where possible
* script that adds it wherever it can be auto-derived
* manually impl for unions and structs with fixed size
  array members
* impl [De]Serialize for compatibility with bincode
* CAUTION! no compatibility with serde_json!

Signed-off-by: Alexandra Iordache <[email protected]>

Author: Alexandra Iordache

Cargo.lock

@@ -13,3 +13,7 @@ kvm-v4_14_0 = []
 kvm-v4_20_0 = []
 
 [dependencies]
+
+[target.'cfg(any(target_arch = "x86", target_arch = "x86_64"))'.dependencies]
+serde = ">=1.0.27"
+serde_derive = ">=1.0.27"

Cargo.toml

@@ -0,0 +1,50 @@
+from glob import glob
+import fileinput
+
+
+BLACKLIST = [
+    'kvm_enable_cap ',
+    'kvm_hyperv_exit__bindgen_ty_1__bindgen_ty_2 ',
+    'kvm_ioapic_state ',
+    'kvm_ioeventfd ',
+    'kvm_lapic_state ',
+    'kvm_ppc_pvinfo ',
+    'kvm_xsave ',
+    'union '
+]
+
+
+def println(line):
+    print(line, end='')
+
+
+def main():
+    with fileinput.input(files=glob('src/x86/bindings_*.rs'),
+                         inplace=True, backup='.bak',) as src:
+        for line in src:
+            # Add Serialize & Deserialize where necessary.
+            if line.startswith('#[derive('):
+                # Skip if Serialize & Deserialize were manually added.
+                if 'Serialize' in line:
+                    println(line)
+                    continue
+
+                # Don't derive [De]Serialize on structs that don't support it.
+                next_line = src.readline()
+                ok_to_derive = True
+                for not_allowed in BLACKLIST:
+                    if not_allowed in next_line:
+                        ok_to_derive = False
+                        break
+                if ok_to_derive:
+                    println(line.replace(')]', ', Serialize, Deserialize)]'))
+                else:
+                    println(line)
+                println(next_line)
+
+            else:
+                println(line)
+
+
+if __name__ == '__main__':
+    main()

add_serde.py

@@ -9,6 +9,11 @@
 mod x86;
 #[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
 pub use self::x86::bindings::*;
+#[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
+extern crate serde;
+#[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
+#[macro_use]
+extern crate serde_derive;
 
 #[cfg(target_arch = "aarch")]
 mod arm;