lib/IRReader/IRReader.cpp

   1 //===---- IRReader.cpp - Reader for LLVM IR files -------------------------===//
   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/IRReader/IRReader.h"
  11 #include "llvm-c/Core.h"
  12 #include "llvm-c/IRReader.h"
  13 #include "llvm/AsmParser/Parser.h"
  14 #include "llvm/Bitcode/ReaderWriter.h"
  15 #include "llvm/IR/LLVMContext.h"
  16 #include "llvm/IR/Module.h"
  17 #include "llvm/Support/MemoryBuffer.h"
  18 #include "llvm/Support/SourceMgr.h"
  19 #include "llvm/Support/Timer.h"
  20 #include "llvm/Support/raw_ostream.h"
  21 #include <system_error>
  22
  23 using namespace llvm;
  24
  25 namespace llvm {
  26   extern bool TimePassesIsEnabled;
  27 }
  28
  29 static const char *const TimeIRParsingGroupName = "LLVM IR Parsing";
  30 static const char *const TimeIRParsingName = "Parse IR";
  31
  32 static std::unique_ptr<Module>
  33 getLazyIRModule(std::unique_ptr<MemoryBuffer> Buffer, SMDiagnostic &Err,
  34                 LLVMContext &Context) {
  35   if (isBitcode((const unsigned char *)Buffer->getBufferStart(),
  36                 (const unsigned char *)Buffer->getBufferEnd())) {
  37     ErrorOr<std::unique_ptr<Module>> ModuleOrErr =
  38         getLazyBitcodeModule(std::move(Buffer), Context);
  39     if (std::error_code EC = ModuleOrErr.getError()) {
  40       Err = SMDiagnostic(Buffer->getBufferIdentifier(), SourceMgr::DK_Error,
  41                          EC.message());
  42       return nullptr;
  43     }
  44     return std::move(ModuleOrErr.get());
  45   }
  46
  47   return parseAssembly(Buffer->getMemBufferRef(), Err, Context);
  48 }
  49
  50 std::unique_ptr<Module> llvm::getLazyIRFileModule(StringRef Filename,
  51                                                   SMDiagnostic &Err,
  52                                                   LLVMContext &Context) {
  53   ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
  54       MemoryBuffer::getFileOrSTDIN(Filename);
  55   if (std::error_code EC = FileOrErr.getError()) {
  56     Err = SMDiagnostic(Filename, SourceMgr::DK_Error,
  57                        "Could not open input file: " + EC.message());
  58     return nullptr;
  59   }
  60
  61   return getLazyIRModule(std::move(FileOrErr.get()), Err, Context);
  62 }
  63
  64 std::unique_ptr<Module> llvm::parseIR(MemoryBufferRef Buffer, SMDiagnostic &Err,
  65                                       LLVMContext &Context) {
  66   NamedRegionTimer T(TimeIRParsingName, TimeIRParsingGroupName,
  67                      TimePassesIsEnabled);
  68   if (isBitcode((const unsigned char *)Buffer.getBufferStart(),
  69                 (const unsigned char *)Buffer.getBufferEnd())) {
  70     ErrorOr<std::unique_ptr<Module>> ModuleOrErr =
  71         parseBitcodeFile(Buffer, Context);
  72     if (std::error_code EC = ModuleOrErr.getError()) {
  73       Err = SMDiagnostic(Buffer.getBufferIdentifier(), SourceMgr::DK_Error,
  74                          EC.message());
  75       return nullptr;
  76     }
  77     return std::move(ModuleOrErr.get());
  78   }
  79
  80   return parseAssembly(Buffer, Err, Context);
  81 }
  82
  83 std::unique_ptr<Module> llvm::parseIRFile(StringRef Filename, SMDiagnostic &Err,
  84                                           LLVMContext &Context) {
  85   ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
  86       MemoryBuffer::getFileOrSTDIN(Filename);
  87   if (std::error_code EC = FileOrErr.getError()) {
  88     Err = SMDiagnostic(Filename, SourceMgr::DK_Error,
  89                        "Could not open input file: " + EC.message());
  90     return nullptr;
  91   }
  92
  93   return parseIR(FileOrErr.get()->getMemBufferRef(), Err, Context);
  94 }
  95
  96 //===----------------------------------------------------------------------===//
  97 // C API.
  98 //===----------------------------------------------------------------------===//
  99
 100 LLVMBool LLVMParseIRInContext(LLVMContextRef ContextRef,
 101                               LLVMMemoryBufferRef MemBuf, LLVMModuleRef *OutM,
 102                               char **OutMessage) {
 103   SMDiagnostic Diag;
 104
 105   std::unique_ptr<MemoryBuffer> MB(unwrap(MemBuf));
 106   *OutM =
 107       wrap(parseIR(MB->getMemBufferRef(), Diag, *unwrap(ContextRef)).release());
 108
 109   if(!*OutM) {
 110     if (OutMessage) {
 111       std::string buf;
 112       raw_string_ostream os(buf);
 113
 114       Diag.print(nullptr, os, false);
 115       os.flush();
 116
 117       *OutMessage = strdup(buf.c_str());
 118     }
 119     return 1;
 120   }
 121
 122   return 0;
 123 }