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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, bool ShouldLazyLoadMetadata) {
     35   if (isBitcode((const unsigned char *)Buffer->getBufferStart(),
     36                 (const unsigned char *)Buffer->getBufferEnd())) {
     37     ErrorOr<std::unique_ptr<Module>> ModuleOrErr = getLazyBitcodeModule(
     38         std::move(Buffer), Context, ShouldLazyLoadMetadata);
     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::move(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                                                   bool ShouldLazyLoadMetadata) {
     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(std::move(FileOrErr.get()), Err, Context,
     63                          ShouldLazyLoadMetadata);
     64 }
     65 
     66 std::unique_ptr<Module> llvm::parseIR(MemoryBufferRef Buffer, SMDiagnostic &Err,
     67                                       LLVMContext &Context) {
     68   NamedRegionTimer T(TimeIRParsingName, TimeIRParsingGroupName,
     69                      TimePassesIsEnabled);
     70   if (isBitcode((const unsigned char *)Buffer.getBufferStart(),
     71                 (const unsigned char *)Buffer.getBufferEnd())) {
     72     ErrorOr<std::unique_ptr<Module>> ModuleOrErr =
     73         parseBitcodeFile(Buffer, Context);
     74     if (std::error_code EC = ModuleOrErr.getError()) {
     75       Err = SMDiagnostic(Buffer.getBufferIdentifier(), SourceMgr::DK_Error,
     76                          EC.message());
     77       return nullptr;
     78     }
     79     return std::move(ModuleOrErr.get());
     80   }
     81 
     82   return parseAssembly(Buffer, Err, Context);
     83 }
     84 
     85 std::unique_ptr<Module> llvm::parseIRFile(StringRef Filename, SMDiagnostic &Err,
     86                                           LLVMContext &Context) {
     87   ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
     88       MemoryBuffer::getFileOrSTDIN(Filename);
     89   if (std::error_code EC = FileOrErr.getError()) {
     90     Err = SMDiagnostic(Filename, SourceMgr::DK_Error,
     91                        "Could not open input file: " + EC.message());
     92     return nullptr;
     93   }
     94 
     95   return parseIR(FileOrErr.get()->getMemBufferRef(), Err, Context);
     96 }
     97 
     98 //===----------------------------------------------------------------------===//
     99 // C API.
    100 //===----------------------------------------------------------------------===//
    101 
    102 LLVMBool LLVMParseIRInContext(LLVMContextRef ContextRef,
    103                               LLVMMemoryBufferRef MemBuf, LLVMModuleRef *OutM,
    104                               char **OutMessage) {
    105   SMDiagnostic Diag;
    106 
    107   std::unique_ptr<MemoryBuffer> MB(unwrap(MemBuf));
    108   *OutM =
    109       wrap(parseIR(MB->getMemBufferRef(), Diag, *unwrap(ContextRef)).release());
    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 }
    126