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, bool ShouldLazyLoadMetadata) {
  35   if (isBitcode((const unsigned char *)Buffer->getBufferStart(),
  36                 (const unsigned char *)Buffer->getBufferEnd())) {
  37     ErrorOr<std::unique_ptr<Module>> ModuleOrErr = getLazyBitcodeModule(
  38         std::move(Buffer), Context, ShouldLazyLoadMetadata);
  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                                                   bool ShouldLazyLoadMetadata) {
  54   ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
  55       MemoryBuffer::getFileOrSTDIN(Filename);
  56   if (std::error_code EC = FileOrErr.getError()) {
  57     Err = SMDiagnostic(Filename, SourceMgr::DK_Error,
  58                        "Could not open input file: " + EC.message());
  59     return nullptr;
  60   }
  61
  62   return getLazyIRModule(std::move(FileOrErr.get()), Err, Context,
  63                          ShouldLazyLoadMetadata);
  64 }
  65
  66 std::unique_ptr<Module> llvm::parseIR(MemoryBufferRef Buffer, SMDiagnostic &Err,
  67                                       LLVMContext &Context) {
  68   NamedRegionTimer T(TimeIRParsingName, TimeIRParsingGroupName,
  69                      TimePassesIsEnabled);
  70   if (isBitcode((const unsigned char *)Buffer.getBufferStart(),
  71                 (const unsigned char *)Buffer.getBufferEnd())) {
  72     ErrorOr<std::unique_ptr<Module>> ModuleOrErr =
  73         parseBitcodeFile(Buffer, Context);
  74     if (std::error_code EC = ModuleOrErr.getError()) {
  75       Err = SMDiagnostic(Buffer.getBufferIdentifier(), SourceMgr::DK_Error,
  76                          EC.message());
  77       return nullptr;
  78     }
  79     return std::move(ModuleOrErr.get());
  80   }
  81
  82   return parseAssembly(Buffer, Err, Context);
  83 }
  84
  85 std::unique_ptr<Module> llvm::parseIRFile(StringRef Filename, SMDiagnostic &Err,
  86                                           LLVMContext &Context) {
  87   ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
  88       MemoryBuffer::getFileOrSTDIN(Filename);
  89   if (std::error_code EC = FileOrErr.getError()) {
  90     Err = SMDiagnostic(Filename, SourceMgr::DK_Error,
  91                        "Could not open input file: " + EC.message());
  92     return nullptr;
  93   }
  94
  95   return parseIR(FileOrErr.get()->getMemBufferRef(), Err, Context);
  96 }
  97
  98 //===----------------------------------------------------------------------===//
  99 // C API.
 100 //===----------------------------------------------------------------------===//
 101
 102 LLVMBool LLVMParseIRInContext(LLVMContextRef ContextRef,
 103                               LLVMMemoryBufferRef MemBuf, LLVMModuleRef *OutM,
 104                               char **OutMessage) {
 105   SMDiagnostic Diag;
 106
 107   std::unique_ptr<MemoryBuffer> MB(unwrap(MemBuf));
 108   *OutM =
 109       wrap(parseIR(MB->getMemBufferRef(), Diag, *unwrap(ContextRef)).release());
 110
 111   if(!*OutM) {
 112     if (OutMessage) {
 113       std::string buf;
 114       raw_string_ostream os(buf);
 115
 116       Diag.print(nullptr, os, false);
 117       os.flush();
 118
 119       *OutMessage = strdup(buf.c_str());
 120     }
 121     return 1;
 122   }
 123
 124   return 0;
 125 }