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/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   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, nullptr, UpgradeDebugInfo);
  90 }
  91
  92 std::unique_ptr<Module> llvm::parseIRFile(StringRef Filename, SMDiagnostic &Err,
  93                                           LLVMContext &Context,
  94                                           bool UpgradeDebugInfo) {
  95   ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
  96       MemoryBuffer::getFileOrSTDIN(Filename);
  97   if (std::error_code EC = FileOrErr.getError()) {
  98     Err = SMDiagnostic(Filename, SourceMgr::DK_Error,
  99                        "Could not open input file: " + EC.message());
 100     return nullptr;
 101   }
 102
 103   return parseIR(FileOrErr.get()->getMemBufferRef(), Err, Context,
 104                  UpgradeDebugInfo);
 105 }
 106
 107 //===----------------------------------------------------------------------===//
 108 // C API.
 109 //===----------------------------------------------------------------------===//
 110
 111 LLVMBool LLVMParseIRInContext(LLVMContextRef ContextRef,
 112                               LLVMMemoryBufferRef MemBuf, LLVMModuleRef *OutM,
 113                               char **OutMessage) {
 114   SMDiagnostic Diag;
 115
 116   std::unique_ptr<MemoryBuffer> MB(unwrap(MemBuf));
 117   *OutM =
 118       wrap(parseIR(MB->getMemBufferRef(), Diag, *unwrap(ContextRef)).release());
 119
 120   if(!*OutM) {
 121     if (OutMessage) {
 122       std::string buf;
 123       raw_string_ostream os(buf);
 124
 125       Diag.print(nullptr, os, false);
 126       os.flush();
 127
 128       *OutMessage = strdup(buf.c_str());
 129     }
 130     return 1;
 131   }
 132
 133   return 0;
 134 }