lib/Bitcode/Reader/BitReader.cpp

   1 //===-- BitReader.cpp -----------------------------------------------------===//
   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 #include "llvm-c/BitReader.h"
  11 #include "llvm/Bitcode/ReaderWriter.h"
  12 #include "llvm/LLVMContext.h"
  13 #include "llvm/Support/MemoryBuffer.h"
  14 #include <string>
  15 #include <cstring>
  16
  17 using namespace llvm;
  18
  19 /* Builds a module from the bitcode in the specified memory buffer, returning a
  20    reference to the module via the OutModule parameter. Returns 0 on success.
  21    Optionally returns a human-readable error message via OutMessage. */
  22 int LLVMParseBitcode(LLVMMemoryBufferRef MemBuf,
  23                      LLVMModuleRef *OutModule, char **OutMessage) {
  24   std::string Message;
  25
  26   *OutModule = wrap(ParseBitcodeFile(unwrap(MemBuf), getGlobalContext(),
  27                                      &Message));
  28   if (!*OutModule) {
  29     if (OutMessage)
  30       *OutMessage = strdup(Message.c_str());
  31     return 1;
  32   }
  33
  34   return 0;
  35 }
  36
  37 int LLVMParseBitcodeInContext(LLVMContextRef ContextRef,
  38                               LLVMMemoryBufferRef MemBuf,
  39                               LLVMModuleRef *OutModule, char **OutMessage) {
  40   std::string Message;
  41
  42   *OutModule = wrap(ParseBitcodeFile(unwrap(MemBuf), *unwrap(ContextRef),
  43                                      &Message));
  44   if (!*OutModule) {
  45     if (OutMessage)
  46       *OutMessage = strdup(Message.c_str());
  47     return 1;
  48   }
  49
  50   return 0;
  51 }
  52
  53 /* Reads a module from the specified path, returning via the OutModule parameter
  54    a module provider which performs lazy deserialization. Returns 0 on success.
  55    Optionally returns a human-readable error message via OutMessage. */
  56 int LLVMGetBitcodeModuleProvider(LLVMMemoryBufferRef MemBuf,
  57                                  LLVMModuleProviderRef *OutMP,
  58                                   char **OutMessage) {
  59   std::string Message;
  60
  61   *OutMP = wrap(getBitcodeModuleProvider(unwrap(MemBuf), getGlobalContext(),
  62                                          &Message));
  63
  64   if (!*OutMP) {
  65     if (OutMessage)
  66       *OutMessage = strdup(Message.c_str());
  67       return 1;
  68   }
  69
  70   return 0;
  71 }
  72
  73 int LLVMGetBitcodeModuleProviderInContext(LLVMContextRef ContextRef,
  74                                           LLVMMemoryBufferRef MemBuf,
  75                                           LLVMModuleProviderRef *OutMP,
  76                                           char **OutMessage) {
  77   std::string Message;
  78
  79   *OutMP = wrap(getBitcodeModuleProvider(unwrap(MemBuf), *unwrap(ContextRef),
  80                                          &Message));
  81   if (!*OutMP) {
  82     if (OutMessage)
  83       *OutMessage = strdup(Message.c_str());
  84     return 1;
  85   }
  86
  87   return 0;
  88 }