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 Module *getLazyIRModule(std::unique_ptr<MemoryBuffer> Buffer,
  33                                SMDiagnostic &Err, LLVMContext &Context) {
  34   if (isBitcode((const unsigned char *)Buffer->getBufferStart(),
  35                 (const unsigned char *)Buffer->getBufferEnd())) {
  36     std::string ErrMsg;
  37     ErrorOr<Module *> ModuleOrErr = getLazyBitcodeModule(Buffer.get(), Context);
  38     if (std::error_code EC = ModuleOrErr.getError()) {
  39       Err = SMDiagnostic(Buffer->getBufferIdentifier(), SourceMgr::DK_Error,
  40                          EC.message());
  41       return nullptr;
  42     }
  43     // getLazyBitcodeModule takes ownership of the Buffer when successful.
  44     Buffer.release();
  45     return ModuleOrErr.get();
  46   }
  47
  48   return ParseAssembly(std::move(Buffer), nullptr, Err, Context);
  49 }
  50
  51 Module *llvm::getLazyIRFileModule(const std::string &Filename,
  52                                   SMDiagnostic &Err, 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 Module *llvm::ParseIR(MemoryBuffer *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     Module *M = nullptr;
  72     if (std::error_code EC = ModuleOrErr.getError())
  73       Err = SMDiagnostic(Buffer->getBufferIdentifier(), SourceMgr::DK_Error,
  74                          EC.message());
  75     else
  76       M = ModuleOrErr.get();
  77     // parseBitcodeFile does not take ownership of the Buffer.
  78     return M;
  79   }
  80
  81   return ParseAssembly(std::unique_ptr<MemoryBuffer>(MemoryBuffer::getMemBuffer(
  82                            Buffer->getBuffer(), Buffer->getBufferIdentifier())),
  83                        nullptr, Err, Context);
  84 }
  85
  86 Module *llvm::ParseIRFile(const std::string &Filename, SMDiagnostic &Err,
  87                           LLVMContext &Context) {
  88   ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
  89       MemoryBuffer::getFileOrSTDIN(Filename);
  90   if (std::error_code EC = FileOrErr.getError()) {
  91     Err = SMDiagnostic(Filename, SourceMgr::DK_Error,
  92                        "Could not open input file: " + EC.message());
  93     return nullptr;
  94   }
  95
  96   return ParseIR(FileOrErr.get().get(), Err, Context);
  97 }
  98
  99 //===----------------------------------------------------------------------===//
 100 // C API.
 101 //===----------------------------------------------------------------------===//
 102
 103 LLVMBool LLVMParseIRInContext(LLVMContextRef ContextRef,
 104                               LLVMMemoryBufferRef MemBuf, LLVMModuleRef *OutM,
 105                               char **OutMessage) {
 106   SMDiagnostic Diag;
 107
 108   std::unique_ptr<MemoryBuffer> MB(unwrap(MemBuf));
 109   *OutM = wrap(ParseIR(MB.get(), Diag, *unwrap(ContextRef)));
 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 }