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/IRReader.h"
  12 #include "llvm/AsmParser/Parser.h"
  13 #include "llvm/Bitcode/BitcodeReader.h"
  14 #include "llvm/IR/LLVMContext.h"
  15 #include "llvm/IR/Module.h"
  16 #include "llvm/Support/MemoryBuffer.h"
  17 #include "llvm/Support/SourceMgr.h"
  18 #include "llvm/Support/Timer.h"
  19 #include "llvm/Support/raw_ostream.h"
  20 #include <system_error>
  21
  22 using namespace llvm;
  23
  24 namespace llvm {
  25   extern bool TimePassesIsEnabled;
  26 }
  27
  28 static const char *const TimeIRParsingGroupName = "irparse";
  29 static const char *const TimeIRParsingGroupDescription = "LLVM IR Parsing";
  30 static const char *const TimeIRParsingName = "parse";
  31 static const char *const TimeIRParsingDescription = "Parse IR";
  32
  33 static std::unique_ptr<Module>
  34 getLazyIRModule(std::unique_ptr<MemoryBuffer> Buffer, SMDiagnostic &Err,
  35                 LLVMContext &Context, bool ShouldLazyLoadMetadata) {
  36   if (isBitcode((const unsigned char *)Buffer->getBufferStart(),
  37                 (const unsigned char *)Buffer->getBufferEnd())) {
  38     Expected<std::unique_ptr<Module>> ModuleOrErr = getOwningLazyBitcodeModule(
  39         std::move(Buffer), Context, ShouldLazyLoadMetadata);
  40     if (Error E = ModuleOrErr.takeError()) {
  41       handleAllErrors(std::move(E), [&](ErrorInfoBase &EIB) {
  42         Err = SMDiagnostic(Buffer->getBufferIdentifier(), SourceMgr::DK_Error,
  43                            EIB.message());
  44       });
  45       return nullptr;
  46     }
  47     return std::move(ModuleOrErr.get());
  48   }
  49
  50   return parseAssembly(Buffer->getMemBufferRef(), Err, Context);
  51 }
  52
  53 std::unique_ptr<Module> llvm::getLazyIRFileModule(StringRef Filename,
  54                                                   SMDiagnostic &Err,
  55                                                   LLVMContext &Context,
  56                                                   bool ShouldLazyLoadMetadata) {
  57   ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
  58       MemoryBuffer::getFileOrSTDIN(Filename);
  59   if (std::error_code EC = FileOrErr.getError()) {
  60     Err = SMDiagnostic(Filename, SourceMgr::DK_Error,
  61                        "Could not open input file: " + EC.message());
  62     return nullptr;
  63   }
  64
  65   return getLazyIRModule(std::move(FileOrErr.get()), Err, Context,
  66                          ShouldLazyLoadMetadata);
  67 }
  68
  69 std::unique_ptr<Module> llvm::parseIR(MemoryBufferRef Buffer, SMDiagnostic &Err,
  70                                       LLVMContext &Context,
  71                                       bool UpgradeDebugInfo,
  72                                       StringRef DataLayoutString) {
  73   NamedRegionTimer T(TimeIRParsingName, TimeIRParsingDescription,
  74                      TimeIRParsingGroupName, TimeIRParsingGroupDescription,
  75                      TimePassesIsEnabled);
  76   if (isBitcode((const unsigned char *)Buffer.getBufferStart(),
  77                 (const unsigned char *)Buffer.getBufferEnd())) {
  78     Expected<std::unique_ptr<Module>> ModuleOrErr =
  79         parseBitcodeFile(Buffer, Context);
  80     if (Error E = ModuleOrErr.takeError()) {
  81       handleAllErrors(std::move(E), [&](ErrorInfoBase &EIB) {
  82         Err = SMDiagnostic(Buffer.getBufferIdentifier(), SourceMgr::DK_Error,
  83                            EIB.message());
  84       });
  85       return nullptr;
  86     }
  87     if (!DataLayoutString.empty())
  88       ModuleOrErr.get()->setDataLayout(DataLayoutString);
  89     return std::move(ModuleOrErr.get());
  90   }
  91
  92   return parseAssembly(Buffer, Err, Context, nullptr, UpgradeDebugInfo,
  93                        DataLayoutString);
  94 }
  95
  96 std::unique_ptr<Module> llvm::parseIRFile(StringRef Filename, SMDiagnostic &Err,
  97                                           LLVMContext &Context,
  98                                           bool UpgradeDebugInfo,
  99                                           StringRef DataLayoutString) {
 100   ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
 101       MemoryBuffer::getFileOrSTDIN(Filename);
 102   if (std::error_code EC = FileOrErr.getError()) {
 103     Err = SMDiagnostic(Filename, SourceMgr::DK_Error,
 104                        "Could not open input file: " + EC.message());
 105     return nullptr;
 106   }
 107
 108   return parseIR(FileOrErr.get()->getMemBufferRef(), Err, Context,
 109                  UpgradeDebugInfo, DataLayoutString);
 110 }
 111
 112 //===----------------------------------------------------------------------===//
 113 // C API.
 114 //===----------------------------------------------------------------------===//
 115
 116 LLVMBool LLVMParseIRInContext(LLVMContextRef ContextRef,
 117                               LLVMMemoryBufferRef MemBuf, LLVMModuleRef *OutM,
 118                               char **OutMessage) {
 119   SMDiagnostic Diag;
 120
 121   std::unique_ptr<MemoryBuffer> MB(unwrap(MemBuf));
 122   *OutM =
 123       wrap(parseIR(MB->getMemBufferRef(), Diag, *unwrap(ContextRef)).release());
 124
 125   if(!*OutM) {
 126     if (OutMessage) {
 127       std::string buf;
 128       raw_string_ostream os(buf);
 129
 130       Diag.print(nullptr, os, false);
 131       os.flush();
 132
 133       *OutMessage = strdup(buf.c_str());
 134     }
 135     return 1;
 136   }
 137
 138   return 0;
 139 }