[python bindings] Added code to get the length of a memory buffer. Tests are included.

This is a part of a series of patches that have been sitting fallow on a
personal branch that I have been messing with for a bit.

The patches start to flesh out the python llvm-c wrapper to the point where you can:

1. Load Modules from Bitcode/Dump/Print them.
2. Iterate over Functions from those modules/get their names/dump them.
3. Iterate over the BasicBlocks from said function/get the BB's name/dump it.
4. Iterate over the Instructions in said BasicBlocks/get the instructions
   name/dump the instruction.

My main interest in developing this was to be able to gather statistics about
LLVM IR using python scripts to speed up statistical profiling of different IR
level transformations (hence the focus on printing/dumping/getting names).

This is a gift from me to the LLVM community = ).

I am going to be committing the patches slowly over the next bit as I have time
to prepare the patches.

The overall organization follows the c-api like the bindings that are already
implemented.

llvm-svn: 190388

4 files changed, 14 insertions, 0 deletions

diff --git a/llvm/bindings/python/llvm/core.py b/llvm/bindings/python/llvm/core.py
index 67566374256..bd61a6ac993 100644
--- a/llvm/bindings/python/llvm/core.py
+++ b/llvm/bindings/python/llvm/core.py
@@ -83,11 +83,17 @@ class MemoryBuffer(LLVMObject):
 
         LLVMObject.__init__(self, memory, disposer=lib.LLVMDisposeMemoryBuffer)
 
+    def __len__(self):
+        return lib.LLVMGetBufferSize(self)
+
 def register_library(library):
+    # Memory buffer declarations
     library.LLVMCreateMemoryBufferWithContentsOfFile.argtypes = [c_char_p,
             POINTER(c_object_p), POINTER(c_char_p)]
     library.LLVMCreateMemoryBufferWithContentsOfFile.restype = bool
 
+    library.LLVMGetBufferSize.argtypes = [MemoryBuffer]
+
     library.LLVMDisposeMemoryBuffer.argtypes = [MemoryBuffer]
 
 def register_enumerations():
diff --git a/llvm/bindings/python/llvm/tests/base.py b/llvm/bindings/python/llvm/tests/base.py
index ff9eb2fc143..22da5fdbdd0 100644
--- a/llvm/bindings/python/llvm/tests/base.py
+++ b/llvm/bindings/python/llvm/tests/base.py
@@ -30,3 +30,6 @@ class TestBase(unittest.TestCase):
 
         raise Exception('No suitable test binaries available!')
     get_test_binary.__test__ = False
+
+    def get_test_file(self):
+        return os.path.join(os.path.dirname(os.path.abspath(__file__)), "test_file")
diff --git a/llvm/bindings/python/llvm/tests/test_core.py b/llvm/bindings/python/llvm/tests/test_core.py
index 545abc826ea..699f3105e81 100644
--- a/llvm/bindings/python/llvm/tests/test_core.py
+++ b/llvm/bindings/python/llvm/tests/test_core.py
@@ -21,3 +21,7 @@ class TestCore(TestBase):
         with self.assertRaises(Exception):
             MemoryBuffer(filename="/hopefully/this/path/doesnt/exist")
 
+    def test_memory_buffer_len(self):
+        source = self.get_test_file()
+        m = MemoryBuffer(filename=source)
+        self.assertEqual(len(m), 50)
diff --git a/llvm/bindings/python/llvm/tests/test_file b/llvm/bindings/python/llvm/tests/test_file
new file mode 100644
index 00000000000..6c9b0385bd9
--- /dev/null
+++ b/llvm/bindings/python/llvm/tests/test_file
@@ -0,0 +1 @@
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\ No newline at end of file