sim: Include object header files in SWIG interfaces

When casting objects in the generated SWIG interfaces, SWIG uses
classical C-style casts ( (Foo *)bar; ). In some cases, this can
degenerate into the equivalent of a reinterpret_cast (mainly if only a
forward declaration of the type is available). This usually works for
most compilers, but it is known to break if multiple inheritance is
used anywhere in the object hierarchy.

This patch introduces the cxx_header attribute to Python SimObject
definitions, which should be used to specify a header to include in
the SWIG interface. The header should include the declaration of the
wrapped object. We currently don't enforce header the use of the
header attribute, but a warning will be generated for objects that do
not use it.

1 files changed, 3 insertions, 0 deletions

diff --git a/src/dev/x86/X86IntPin.py b/src/dev/x86/X86IntPin.py
index 35e274624..53760b496 100644
--- a/src/dev/x86/X86IntPin.py
+++ b/src/dev/x86/X86IntPin.py
@@ -33,11 +33,13 @@ from m5.SimObject import SimObject
 class X86IntSourcePin(SimObject):
     type = 'X86IntSourcePin'
     cxx_class = 'X86ISA::IntSourcePin'
+    cxx_header = "dev/x86/intdev.hh"
 
 # A generic pin to receive an interrupt signal generated by another device.
 class X86IntSinkPin(SimObject):
     type = 'X86IntSinkPin'
     cxx_class = 'X86ISA::IntSinkPin'
+    cxx_header = "dev/x86/intdev.hh"
 
     device = Param.SimObject("Device this pin belongs to")
     number = Param.Int("The pin number on the device")
@@ -46,6 +48,7 @@ class X86IntSinkPin(SimObject):
 class X86IntLine(SimObject):
     type = 'X86IntLine'
     cxx_class = 'X86ISA::IntLine'
+    cxx_header = "dev/x86/intdev.hh"
 
     source = Param.X86IntSourcePin("Pin driving this line")
     sink = Param.X86IntSinkPin("Pin driven by this line")