llvm/lib/IRReader/IRReader.cpp

   1 //===---- IRReader.cpp - Reader for LLVM IR files -------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "llvm/IRReader/IRReader.h"
  10 #include "llvm-c/IRReader.h"
  11 #include "llvm/AsmParser/Parser.h"
  12 #include "llvm/Bitcode/BitcodeReader.h"
  13 #include "llvm/IR/LLVMContext.h"
  14 #include "llvm/IR/Module.h"
  15 #include "llvm/Support/MemoryBuffer.h"
  16 #include "llvm/Support/SourceMgr.h"
  17 #include "llvm/Support/Timer.h"
  18 #include "llvm/Support/raw_ostream.h"
  19 #include <system_error>
  20
  21 using namespace llvm;
  22
  23 namespace llvm {
  24   extern bool TimePassesIsEnabled;
  25 }
  26
  27 const char TimeIRParsingGroupName[] = "irparse";
  28 const char TimeIRParsingGroupDescription[] = "LLVM IR Parsing";
  29 const char TimeIRParsingName[] = "parse";
  30 const char TimeIRParsingDescription[] = "Parse IR";
  31
  32 std::unique_ptr<Module>
  33 llvm::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     Expected<std::unique_ptr<Module>> ModuleOrErr = getOwningLazyBitcodeModule(
  38         std::move(Buffer), Context, ShouldLazyLoadMetadata);
  39     if (Error E = ModuleOrErr.takeError()) {
  40       handleAllErrors(std::move(E), [&](ErrorInfoBase &EIB) {
  41         Err = SMDiagnostic(Buffer->getBufferIdentifier(), SourceMgr::DK_Error,
  42                            EIB.message());
  43       });
  44       return nullptr;
  45     }
  46     return std::move(ModuleOrErr.get());
  47   }
  48
  49   return parseAssembly(Buffer->getMemBufferRef(), Err, Context);
  50 }
  51
  52 std::unique_ptr<Module> llvm::getLazyIRFileModule(StringRef Filename,
  53                                                   SMDiagnostic &Err,
  54                                                   LLVMContext &Context,
  55                                                   bool ShouldLazyLoadMetadata) {
  56   ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
  57       MemoryBuffer::getFileOrSTDIN(Filename);
  58   if (std::error_code EC = FileOrErr.getError()) {
  59     Err = SMDiagnostic(Filename, SourceMgr::DK_Error,
  60                        "Could not open input file: " + EC.message());
  61     return nullptr;
  62   }
  63
  64   return getLazyIRModule(std::move(FileOrErr.get()), Err, Context,
  65                          ShouldLazyLoadMetadata);
  66 }
  67
  68 std::unique_ptr<Module> llvm::parseIR(MemoryBufferRef Buffer, SMDiagnostic &Err,
  69                                       LLVMContext &Context,
  70                                       DataLayoutCallbackTy DataLayoutCallback) {
  71   NamedRegionTimer T(TimeIRParsingName, TimeIRParsingDescription,
  72                      TimeIRParsingGroupName, TimeIRParsingGroupDescription,
  73                      TimePassesIsEnabled);
  74   if (isBitcode((const unsigned char *)Buffer.getBufferStart(),
  75                 (const unsigned char *)Buffer.getBufferEnd())) {
  76     Expected<std::unique_ptr<Module>> ModuleOrErr =
  77         parseBitcodeFile(Buffer, Context, DataLayoutCallback);
  78     if (Error E = ModuleOrErr.takeError()) {
  79       handleAllErrors(std::move(E), [&](ErrorInfoBase &EIB) {
  80         Err = SMDiagnostic(Buffer.getBufferIdentifier(), SourceMgr::DK_Error,
  81                            EIB.message());
  82       });
  83       return nullptr;
  84     }
  85     return std::move(ModuleOrErr.get());
  86   }
  87
  88   return parseAssembly(Buffer, Err, Context, nullptr, DataLayoutCallback);
  89 }
  90
  91 std::unique_ptr<Module>
  92 llvm::parseIRFile(StringRef Filename, SMDiagnostic &Err, LLVMContext &Context,
  93                   DataLayoutCallbackTy DataLayoutCallback) {
  94   ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
  95       MemoryBuffer::getFileOrSTDIN(Filename, /*IsText=*/true);
  96   if (std::error_code EC = FileOrErr.getError()) {
  97     Err = SMDiagnostic(Filename, SourceMgr::DK_Error,
  98                        "Could not open input file: " + EC.message());
  99     return nullptr;
 100   }
 101
 102   return parseIR(FileOrErr.get()->getMemBufferRef(), Err, Context,
 103                  DataLayoutCallback);
 104 }
 105
 106 //===----------------------------------------------------------------------===//
 107 // C API.
 108 //===----------------------------------------------------------------------===//
 109
 110 LLVMBool LLVMParseIRInContext(LLVMContextRef ContextRef,
 111                               LLVMMemoryBufferRef MemBuf, LLVMModuleRef *OutM,
 112                               char **OutMessage) {
 113   SMDiagnostic Diag;
 114
 115   std::unique_ptr<MemoryBuffer> MB(unwrap(MemBuf));
 116   *OutM =
 117       wrap(parseIR(MB->getMemBufferRef(), Diag, *unwrap(ContextRef)).release());
 118
 119   if(!*OutM) {
 120     if (OutMessage) {
 121       std::string buf;
 122       raw_string_ostream os(buf);
 123
 124       Diag.print(nullptr, os, false);
 125       os.flush();
 126
 127       *OutMessage = strdup(buf.c_str());
 128     }
 129     return 1;
 130   }
 131
 132   return 0;
 133 }