1 /*===-- bitwriter_ocaml.c - LLVM Ocaml Glue ---------------------*- C++ -*-===*\
2 |*                                                                            *|
3 |*                     The LLVM Compiler Infrastructure                       *|
4 |*                                                                            *|
5 |* This file is distributed under the University of Illinois Open Source      *|
6 |* License. See LICENSE.TXT for details.                                      *|
7 |*                                                                            *|
8 |*===----------------------------------------------------------------------===*|
9 |*                                                                            *|
10 |* This file glues LLVM's ocaml interface to its C interface. These functions *|
11 |* are by and large transparent wrappers to the corresponding C functions.    *|
12 |*                                                                            *|
13 \*===----------------------------------------------------------------------===*/
14 
15 #include "llvm-c/BitReader.h"
16 #include "caml/alloc.h"
17 #include "caml/fail.h"
18 #include "caml/memory.h"
19 
20 
21 /* Can't use the recommended caml_named_value mechanism for backwards
22    compatibility reasons. This is largely equivalent. */
23 static value llvm_bitreader_error_exn;
24 
25 CAMLprim value llvm_register_bitreader_exns(value Error) {
26   llvm_bitreader_error_exn = Field(Error, 0);
27   register_global_root(&llvm_bitreader_error_exn);
28   return Val_unit;
29 }
30 
31 static void llvm_raise(value Prototype, char *Message) {
32   CAMLparam1(Prototype);
33   CAMLlocal1(CamlMessage);
34 
35   CamlMessage = copy_string(Message);
36   LLVMDisposeMessage(Message);
37 
38   raise_with_arg(Prototype, CamlMessage);
39   abort(); /* NOTREACHED */
40 #ifdef CAMLnoreturn
41   CAMLnoreturn; /* Silences warnings, but is missing in some versions. */
42 #endif
43 }
44 
45 
46 /*===-- Modules -----------------------------------------------------------===*/
47 
48 /* Llvm.llmemorybuffer -> Llvm.module */
49 CAMLprim value llvm_get_module_provider(LLVMMemoryBufferRef MemBuf) {
50   CAMLparam0();
51   CAMLlocal2(Variant, MessageVal);
52   char *Message;
53 
54   LLVMModuleProviderRef MP;
55   if (LLVMGetBitcodeModuleProvider(MemBuf, &MP, &Message))
56     llvm_raise(llvm_bitreader_error_exn, Message);
57 
58   CAMLreturn((value) MemBuf);
59 }
60 
61 /* Llvm.llmemorybuffer -> Llvm.llmodule */
62 CAMLprim value llvm_parse_bitcode(LLVMMemoryBufferRef MemBuf) {
63   CAMLparam0();
64   CAMLlocal2(Variant, MessageVal);
65   LLVMModuleRef M;
66   char *Message;
67 
68   if (LLVMParseBitcode(MemBuf, &M, &Message))
69     llvm_raise(llvm_bitreader_error_exn, Message);
70 
71   CAMLreturn((value) M);
72 }
73