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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 std::unique_ptr<Module>
     33 getLazyIRModule(std::unique_ptr<MemoryBuffer> Buffer, SMDiagnostic &Err,
     34                 LLVMContext &Context) {
     35   if (isBitcode((const unsigned char *)Buffer->getBufferStart(),
     36                 (const unsigned char *)Buffer->getBufferEnd())) {
     37     ErrorOr<Module *> ModuleOrErr =
     38         getLazyBitcodeModule(std::move(Buffer), Context);
     39     if (std::error_code EC = ModuleOrErr.getError()) {
     40       Err = SMDiagnostic(Buffer->getBufferIdentifier(), SourceMgr::DK_Error,
     41                          EC.message());
     42       return nullptr;
     43     }
     44     return std::unique_ptr<Module>(ModuleOrErr.get());
     45   }
     46 
     47   return parseAssembly(Buffer->getMemBufferRef(), Err, Context);
     48 }
     49 
     50 std::unique_ptr<Module> llvm::getLazyIRFileModule(StringRef Filename,
     51                                                   SMDiagnostic &Err,
     52                                                   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 std::unique_ptr<Module> llvm::parseIR(MemoryBufferRef 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     if (std::error_code EC = ModuleOrErr.getError()) {
     72       Err = SMDiagnostic(Buffer.getBufferIdentifier(), SourceMgr::DK_Error,
     73                          EC.message());
     74       return nullptr;
     75     }
     76     return std::unique_ptr<Module>(ModuleOrErr.get());
     77   }
     78 
     79   return parseAssembly(Buffer, Err, Context);
     80 }
     81 
     82 std::unique_ptr<Module> llvm::parseIRFile(StringRef Filename, SMDiagnostic &Err,
     83                                           LLVMContext &Context) {
     84   ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
     85       MemoryBuffer::getFileOrSTDIN(Filename);
     86   if (std::error_code EC = FileOrErr.getError()) {
     87     Err = SMDiagnostic(Filename, SourceMgr::DK_Error,
     88                        "Could not open input file: " + EC.message());
     89     return nullptr;
     90   }
     91 
     92   return parseIR(FileOrErr.get()->getMemBufferRef(), Err, Context);
     93 }
     94 
     95 //===----------------------------------------------------------------------===//
     96 // C API.
     97 //===----------------------------------------------------------------------===//
     98 
     99 LLVMBool LLVMParseIRInContext(LLVMContextRef ContextRef,
    100                               LLVMMemoryBufferRef MemBuf, LLVMModuleRef *OutM,
    101                               char **OutMessage) {
    102   SMDiagnostic Diag;
    103 
    104   std::unique_ptr<MemoryBuffer> MB(unwrap(MemBuf));
    105   *OutM =
    106       wrap(parseIR(MB->getMemBufferRef(), Diag, *unwrap(ContextRef)).release());
    107 
    108   if(!*OutM) {
    109     if (OutMessage) {
    110       std::string buf;
    111       raw_string_ostream os(buf);
    112 
    113       Diag.print(nullptr, os, false);
    114       os.flush();
    115 
    116       *OutMessage = strdup(buf.c_str());
    117     }
    118     return 1;
    119   }
    120 
    121   return 0;
    122 }
    123