Adding Ocaml bindings for the bitreader as requested by Sarah

Thompson. Usage should be something like this:

open Llvm
open Llvm_bitreader

match read_bitcode_file fn with
  | Bitreader_failure msg ->
      prerr_endline msg
  | Bitreader_success m -> 
      ...;
      dispose_module m

Compile with: ocamlc llvm.cma llvm_bitreader.cma
              ocamlopt llvm.cmxa llvm_bitreader.cmxa

llvm-svn: 44824

1 files changed, 46 insertions, 0 deletions

diff --git a/llvm/bindings/ocaml/bitreader/bitreader_ocaml.c b/llvm/bindings/ocaml/bitreader/bitreader_ocaml.c
new file mode 100644
index 00000000000..7088fa5a478
--- /dev/null
+++ b/llvm/bindings/ocaml/bitreader/bitreader_ocaml.c
@@ -0,0 +1,46 @@
+/*===-- bitwriter_ocaml.c - LLVM Ocaml Glue ---------------------*- C++ -*-===*\
+|*                                                                            *|
+|*                     The LLVM Compiler Infrastructure                       *|
+|*                                                                            *|
+|* This file was developed by Gordon Henriksen and is distributed under the   *|
+|* University of Illinois Open Source License. See LICENSE.TXT for details.   *|
+|*                                                                            *|
+|*===----------------------------------------------------------------------===*|
+|*                                                                            *|
+|* This file glues LLVM's ocaml interface to its C interface. These functions *|
+|* are by and large transparent wrappers to the corresponding C functions.    *|
+|*                                                                            *|
+\*===----------------------------------------------------------------------===*/
+
+#include "llvm-c/BitReader.h"
+#include "caml/alloc.h"
+#include "caml/mlvalues.h"
+#include "caml/memory.h"
+
+/*===-- Modules -----------------------------------------------------------===*/
+
+/* string -> bitreader_result
+
+   type bitreader_result =
+   | Bitreader_success of Llvm.llmodule
+   | Bitreader_failure of string
+ */
+CAMLprim value llvm_read_bitcode_file(value Path) {
+  LLVMModuleRef M;
+  char *Message;
+  CAMLparam1(Path);
+  CAMLlocal2(Variant, MessageVal);
+  
+  if (LLVMReadBitcodeFromFile(String_val(Path), &M, &Message)) {
+    MessageVal = copy_string(Message);
+    LLVMDisposeBitcodeReaderMessage(Message);
+    
+    Variant = alloc(1, 1);
+    Field(Variant, 0) = MessageVal;
+  } else {
+    Variant = alloc(1, 0);
+    Field(Variant, 0) = Val_op(M);
+  }
+  
+  CAMLreturn(Variant);
+}