contrib/llvm/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/BitcodeReader.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 = "irparse";
  30 static const char *const TimeIRParsingGroupDescription = "LLVM IR Parsing";
  31 static const char *const TimeIRParsingName = "parse";
  32 static const char *const TimeIRParsingDescription = "Parse IR";
  33
  34 static std::unique_ptr<Module>
  35 getLazyIRModule(std::unique_ptr<MemoryBuffer> Buffer, SMDiagnostic &Err,
  36                 LLVMContext &Context, bool ShouldLazyLoadMetadata) {
  37   if (isBitcode((const unsigned char *)Buffer->getBufferStart(),
  38                 (const unsigned char *)Buffer->getBufferEnd())) {
  39     Expected<std::unique_ptr<Module>> ModuleOrErr = getOwningLazyBitcodeModule(
  40         std::move(Buffer), Context, ShouldLazyLoadMetadata);
  41     if (Error E = ModuleOrErr.takeError()) {
  42       handleAllErrors(std::move(E), [&](ErrorInfoBase &EIB) {
  43         Err = SMDiagnostic(Buffer->getBufferIdentifier(), SourceMgr::DK_Error,
  44                            EIB.message());
  45       });
  46       return nullptr;
  47     }
  48     return std::move(ModuleOrErr.get());
  49   }
  50
  51   return parseAssembly(Buffer->getMemBufferRef(), Err, Context);
  52 }
  53
  54 std::unique_ptr<Module> llvm::getLazyIRFileModule(StringRef Filename,
  55                                                   SMDiagnostic &Err,
  56                                                   LLVMContext &Context,
  57                                                   bool ShouldLazyLoadMetadata) {
  58   ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
  59       MemoryBuffer::getFileOrSTDIN(Filename);
  60   if (std::error_code EC = FileOrErr.getError()) {
  61     Err = SMDiagnostic(Filename, SourceMgr::DK_Error,
  62                        "Could not open input file: " + EC.message());
  63     return nullptr;
  64   }
  65
  66   return getLazyIRModule(std::move(FileOrErr.get()), Err, Context,
  67                          ShouldLazyLoadMetadata);
  68 }
  69
  70 std::unique_ptr<Module> llvm::parseIR(MemoryBufferRef Buffer, SMDiagnostic &Err,
  71                                       LLVMContext &Context) {
  72   NamedRegionTimer T(TimeIRParsingName, TimeIRParsingDescription,
  73                      TimeIRParsingGroupName, TimeIRParsingGroupDescription,
  74                      TimePassesIsEnabled);
  75   if (isBitcode((const unsigned char *)Buffer.getBufferStart(),
  76                 (const unsigned char *)Buffer.getBufferEnd())) {
  77     Expected<std::unique_ptr<Module>> ModuleOrErr =
  78         parseBitcodeFile(Buffer, Context);
  79     if (Error E = ModuleOrErr.takeError()) {
  80       handleAllErrors(std::move(E), [&](ErrorInfoBase &EIB) {
  81         Err = SMDiagnostic(Buffer.getBufferIdentifier(), SourceMgr::DK_Error,
  82                            EIB.message());
  83       });
  84       return nullptr;
  85     }
  86     return std::move(ModuleOrErr.get());
  87   }
  88
  89   return parseAssembly(Buffer, Err, Context);
  90 }
  91
  92 std::unique_ptr<Module> llvm::parseIRFile(StringRef Filename, SMDiagnostic &Err,
  93                                           LLVMContext &Context) {
  94   ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
  95       MemoryBuffer::getFileOrSTDIN(Filename);
  96   if (std::error_code EC = FileOrErr.getError()) {
  97     Err = SMDiagnostic(Filename, SourceMgr::DK_Error,
  98                        "Could not open input file: " + EC.message());
  99     return nullptr;
 100   }
 101
 102   return parseIR(FileOrErr.get()->getMemBufferRef(), Err, Context);
 103 }
 104
 105 //===----------------------------------------------------------------------===//
 106 // C API.
 107 //===----------------------------------------------------------------------===//
 108
 109 LLVMBool LLVMParseIRInContext(LLVMContextRef ContextRef,
 110                               LLVMMemoryBufferRef MemBuf, LLVMModuleRef *OutM,
 111                               char **OutMessage) {
 112   SMDiagnostic Diag;
 113
 114   std::unique_ptr<MemoryBuffer> MB(unwrap(MemBuf));
 115   *OutM =
 116       wrap(parseIR(MB->getMemBufferRef(), Diag, *unwrap(ContextRef)).release());
 117
 118   if(!*OutM) {
 119     if (OutMessage) {
 120       std::string buf;
 121       raw_string_ostream os(buf);
 122
 123       Diag.print(nullptr, os, false);
 124       os.flush();
 125
 126       *OutMessage = strdup(buf.c_str());
 127     }
 128     return 1;
 129   }
 130
 131   return 0;
 132 }