[PATCH] change marshalling macros to consider alignment of types

[Frediano Ziglio <fziglio@xxxxxxxxxx>]

---
 python_modules/demarshal.py | 30 ++++++++++++++++++++++--------
 1 file changed, 22 insertions(+), 8 deletions(-)

diff --git a/python_modules/demarshal.py b/python_modules/demarshal.py
index 209eafc..743b0d8 100644
--- a/python_modules/demarshal.py
+++ b/python_modules/demarshal.py
@@ -40,20 +40,34 @@ def write_parser_helpers(writer):
 
     writer = writer.function_helper()
 
+    for sign in ["", "u"]:
+        type = "%sint8" % sign
+        writer.macro("read_%s" % type, "ptr", "(*((%s_t *)(ptr)))" % type)
+        writer.macro("write_%s" % type, "ptr, val", "(*((%s_t *)(ptr))) = val" % type)
     writer.writeln("#ifdef WORDS_BIGENDIAN")
-    for size in [8, 16, 32, 64]:
+    for size in [16, 32, 64]:
         for sign in ["", "u"]:
             utype = "uint%d" % (size)
             type = "%sint%d" % (sign, size)
             swap = "SPICE_BYTESWAP%d" % size
-            if size == 8:
-                writer.macro("read_%s" % type, "ptr", "(*((%s_t *)(ptr)))" % type)
-                writer.macro("write_%s" % type, "ptr, val", "*(%s_t *)(ptr) = val" % (type))
-            else:
-                writer.macro("read_%s" % type, "ptr", "((%s_t)%s(*((%s_t *)(ptr))))" % (type, swap, utype))
-                writer.macro("write_%s" % type, "ptr, val", "*(%s_t *)(ptr) = %s((%s_t)val)" % (utype, swap, utype))
+            writer.macro("read_%s" % type, "ptr", "((%s_t)%s(*((%s_t *)(ptr))))" % (type, swap, utype))
+            writer.macro("write_%s" % type, "ptr, val", "*(%s_t *)(ptr) = %s((%s_t)val)" % (utype, swap, utype))
+    writer.writeln("#elif __GNUC__ > 3")
+    struct = "pkg_struct"
+    writer.begin_block("typedef union __attribute__ ((__packed__))")
+    for size in [16, 32, 64]:
+        for sign in ["", "u"]:
+            type = "%sint%d" % (sign, size)
+            writer.variable_def("%s_t" % type, type)
+    writer.unindent()
+    writer.writeln("} %s;" % struct)
+    for size in [16, 32, 64]:
+        for sign in ["", "u"]:
+            type = "%sint%d" % (sign, size)
+            writer.macro("read_%s" % type, "ptr", "(((%s *)(ptr))->%s)" % (struct, type))
+            writer.macro("write_%s" % type, "ptr, val", "((%s *)(ptr))->%s = val" % (struct, type))
     writer.writeln("#else")
-    for size in [8, 16, 32, 64]:
+    for size in [16, 32, 64]:
         for sign in ["", "u"]:
             type = "%sint%d" % (sign, size)
             writer.macro("read_%s" % type, "ptr", "(*((%s_t *)(ptr)))" % type)
-- 
2.4.3

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