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     std::string ErrMsg;
  38     ErrorOr<Module *> ModuleOrErr = getLazyBitcodeModule(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::unique_ptr<Module>(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<Module *> ModuleOrErr = parseBitcodeFile(Buffer, Context);
  71     if (std::error_code EC = ModuleOrErr.getError()) {
  72       Err = SMDiagnostic(Buffer.getBufferIdentifier(), SourceMgr::DK_Error,
  73                          EC.message());
  74       return nullptr;
  75     }
  76     return std::unique_ptr<Module>(ModuleOrErr.get());
  77   }
  78
  79   return parseAssembly(Buffer, Err, Context);
  80 }
  81
  82 std::unique_ptr<Module> llvm::parseIRFile(StringRef Filename, SMDiagnostic &Err,
  83                                           LLVMContext &Context) {
  84   ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
  85       MemoryBuffer::getFileOrSTDIN(Filename);
  86   if (std::error_code EC = FileOrErr.getError()) {
  87     Err = SMDiagnostic(Filename, SourceMgr::DK_Error,
  88                        "Could not open input file: " + EC.message());
  89     return nullptr;
  90   }
  91
  92   return parseIR(FileOrErr.get()->getMemBufferRef(), Err, Context);
  93 }
  94
  95 //===----------------------------------------------------------------------===//
  96 // C API.
  97 //===----------------------------------------------------------------------===//
  98
  99 LLVMBool LLVMParseIRInContext(LLVMContextRef ContextRef,
 100                               LLVMMemoryBufferRef MemBuf, LLVMModuleRef *OutM,
 101                               char **OutMessage) {
 102   SMDiagnostic Diag;
 103
 104   std::unique_ptr<MemoryBuffer> MB(unwrap(MemBuf));
 105   *OutM =
 106       wrap(parseIR(MB->getMemBufferRef(), Diag, *unwrap(ContextRef)).release());
 107
 108   if(!*OutM) {
 109     if (OutMessage) {
 110       std::string buf;
 111       raw_string_ostream os(buf);
 112
 113       Diag.print(nullptr, os, false);
 114       os.flush();
 115
 116       *OutMessage = strdup(buf.c_str());
 117     }
 118     return 1;
 119   }
 120
 121   return 0;
 122 }