From 0b1abe7b26d35f11e826111c9fa026d087dd49d5 Mon Sep 17 00:00:00 2001
From: Siu Kwan Lam <michael.lam.sk@gmail.com>
Date: Mon, 1 Apr 2013 11:24:19 -0500
Subject: [PATCH] Add isLayoutIdentical

---
 llvm/core.py        |  4 ++++
 llvm/test_llvmpy.py | 12 ++++++++++++
 llvmpy/src/Type.py  |  2 ++
 3 files changed, 18 insertions(+)

diff --git a/llvm/core.py b/llvm/core.py
index bbe5d01..719c8a4 100644
--- a/llvm/core.py
+++ b/llvm/core.py
@@ -895,6 +895,10 @@ class StructType(Type):
     def is_opaque(self):
         return self._ptr.isOpaque()
 
+    def is_layout_identical(self, other):
+        return self._ptr.isLayoutIdentical(other._ptr)
+
+
 class ArrayType(Type):
     """Represents an array type."""
     _type_ = api.llvm.ArrayType
diff --git a/llvm/test_llvmpy.py b/llvm/test_llvmpy.py
index 8df32b8..945ac41 100644
--- a/llvm/test_llvmpy.py
+++ b/llvm/test_llvmpy.py
@@ -1245,6 +1245,18 @@ class TestNamedMetaData(TestCase):
 
 tests.append(TestNamedMetaData)
 
+
+# ---------------------------------------------------------------------------
+
+class TestStruct(TestCase):
+    def test_struct_identical(self):
+        m = Module.new('test_struct_identical')
+        ta = Type.struct([Type.int(32), Type.float()], name='ta')
+        tb = Type.struct([Type.int(32), Type.float()])
+        self.assertTrue(ta.is_layout_identical(tb))
+
+tests.append(TestStruct)
+
 # ---------------------------------------------------------------------------
 
 def run(verbosity=1):
diff --git a/llvmpy/src/Type.py b/llvmpy/src/Type.py
index 874201e..afc148c 100644
--- a/llvmpy/src/Type.py
+++ b/llvmpy/src/Type.py
@@ -214,6 +214,8 @@ class StructType:
                              cast(bool, Bool),      # is packed
                              ).require_only(2)
 
+    isLayoutIdentical = Method(cast(Bool, bool), # identical?
+                               ptr(StructType))  # other
 
     isValidElementType = StaticMethod(cast(Bool, bool), ptr(Type))