Bug 1317844 - Add IPC message constructor flag (r=dvander)

MozReview-Commit-ID: 3eEAN5LqJ6N

ipc/chromium/src/chrome/common/ipc_message.h

@@ -98,6 +98,14 @@ class Message : public Pickle {
     }
   }
 
+  bool is_constructor() const {
+    return (header()->flags & CONSTRUCTOR_BIT) != 0;
+  }
+
+  void set_constructor() {
+    header()->flags |= CONSTRUCTOR_BIT;
+  }
+
   // True if this is a synchronous message.
   bool is_sync() const {
     return (header()->flags & SYNC_BIT) != 0;
@@ -278,6 +286,7 @@ class Message : public Pickle {
     INTERRUPT_BIT   = 0x0040,
     COMPRESS_BIT    = 0x0080,
     COMPRESSALL_BIT = 0x0100,
+    CONSTRUCTOR_BIT = 0x0200,
   };
 
   struct Header : Pickle::Header {

ipc/ipdl/ipdl/lower.py

@@ -4445,6 +4445,10 @@ class _GenerateProtocolActorCode(ipdl.ast.Visitor):
             stmts.append(StmtExpr(ExprCall(
                 ExprSelect(var, '->', 'set_interrupt'))))
 
+        if md.decl.type.isCtor():
+            stmts.append(StmtExpr(ExprCall(
+                ExprSelect(var, '->', 'set_constructor'))))
+
         if reply:
             stmts.append(StmtExpr(ExprCall(
                 ExprSelect(var, '->', 'set_reply'))))