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      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(MemoryBuffer *Buffer, SMDiagnostic &Err,
     33                                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, Context);
     38     if (std::error_code EC = ModuleOrErr.getError()) {
     39       Err = SMDiagnostic(Buffer->getBufferIdentifier(), SourceMgr::DK_Error,
     40                          EC.message());
     41       // getLazyBitcodeModule does not take ownership of the Buffer in the
     42       // case of an error.
     43       delete Buffer;
     44       return nullptr;
     45     }
     46     return ModuleOrErr.get();
     47   }
     48 
     49   return ParseAssembly(Buffer, nullptr, Err, Context);
     50 }
     51 
     52 Module *llvm::getLazyIRFileModule(const std::string &Filename, SMDiagnostic &Err,
     53                                   LLVMContext &Context) {
     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(FileOrErr.get().release(), Err, Context);
     63 }
     64 
     65 Module *llvm::ParseIR(MemoryBuffer *Buffer, SMDiagnostic &Err,
     66                       LLVMContext &Context) {
     67   NamedRegionTimer T(TimeIRParsingName, TimeIRParsingGroupName,
     68                      TimePassesIsEnabled);
     69   if (isBitcode((const unsigned char *)Buffer->getBufferStart(),
     70                 (const unsigned char *)Buffer->getBufferEnd())) {
     71     ErrorOr<Module *> ModuleOrErr = parseBitcodeFile(Buffer, Context);
     72     Module *M = nullptr;
     73     if (std::error_code EC = ModuleOrErr.getError())
     74       Err = SMDiagnostic(Buffer->getBufferIdentifier(), SourceMgr::DK_Error,
     75                          EC.message());
     76     else
     77       M = ModuleOrErr.get();
     78     // parseBitcodeFile does not take ownership of the Buffer.
     79     return M;
     80   }
     81 
     82   return ParseAssembly(MemoryBuffer::getMemBuffer(
     83                            Buffer->getBuffer(), Buffer->getBufferIdentifier()),
     84                        nullptr, Err, Context);
     85 }
     86 
     87 Module *llvm::ParseIRFile(const std::string &Filename, SMDiagnostic &Err,
     88                           LLVMContext &Context) {
     89   ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
     90       MemoryBuffer::getFileOrSTDIN(Filename);
     91   if (std::error_code EC = FileOrErr.getError()) {
     92     Err = SMDiagnostic(Filename, SourceMgr::DK_Error,
     93                        "Could not open input file: " + EC.message());
     94     return nullptr;
     95   }
     96 
     97   return ParseIR(FileOrErr.get().get(), Err, Context);
     98 }
     99 
    100 //===----------------------------------------------------------------------===//
    101 // C API.
    102 //===----------------------------------------------------------------------===//
    103 
    104 LLVMBool LLVMParseIRInContext(LLVMContextRef ContextRef,
    105                               LLVMMemoryBufferRef MemBuf, LLVMModuleRef *OutM,
    106                               char **OutMessage) {
    107   SMDiagnostic Diag;
    108 
    109   std::unique_ptr<MemoryBuffer> MB(unwrap(MemBuf));
    110   *OutM = wrap(ParseIR(MB.get(), Diag, *unwrap(ContextRef)));
    111 
    112   if(!*OutM) {
    113     if (OutMessage) {
    114       std::string buf;
    115       raw_string_ostream os(buf);
    116 
    117       Diag.print(nullptr, os, false);
    118       os.flush();
    119 
    120       *OutMessage = strdup(buf.c_str());
    121     }
    122     return 1;
    123   }
    124 
    125   return 0;
    126 }
    127