bindings/ocaml/bitreader/bitreader_ocaml.c

   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.llcontext -> Llvm.llmemorybuffer -> Llvm.llmodule */
  49 CAMLprim value llvm_get_module(LLVMContextRef C, LLVMMemoryBufferRef MemBuf) {
  50   CAMLparam0();
  51   CAMLlocal2(Variant, MessageVal);
  52   char *Message;
  53
  54   LLVMModuleRef M;
  55   if (LLVMGetBitcodeModuleInContext(C, MemBuf, &M, &Message))
  56     llvm_raise(llvm_bitreader_error_exn, Message);
  57
  58   CAMLreturn((value) M);
  59 }
  60
  61 /* Llvm.llcontext -> Llvm.llmemorybuffer -> Llvm.llmodule */
  62 CAMLprim value llvm_parse_bitcode(LLVMContextRef C,
  63                                   LLVMMemoryBufferRef MemBuf) {
  64   CAMLparam0();
  65   CAMLlocal2(Variant, MessageVal);
  66   LLVMModuleRef M;
  67   char *Message;
  68
  69   if (LLVMParseBitcodeInContext(C, MemBuf, &M, &Message))
  70     llvm_raise(llvm_bitreader_error_exn, Message);
  71
  72   CAMLreturn((value) M);
  73 }