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 <optional>
  20 #include <system_error>
  21
  22 using namespace llvm;
  23
  24 namespace llvm {
  25   extern bool TimePassesIsEnabled;
  26 }
  27
  28 const char TimeIRParsingGroupName[] = "irparse";
  29 const char TimeIRParsingGroupDescription[] = "LLVM IR Parsing";
  30 const char TimeIRParsingName[] = "parse";
  31 const char TimeIRParsingDescription[] = "Parse IR";
  32
  33 std::unique_ptr<Module>
  34 llvm::getLazyIRModule(std::unique_ptr<MemoryBuffer> Buffer, SMDiagnostic &Err,
  35                       LLVMContext &Context, bool ShouldLazyLoadMetadata) {
  36   if (isBitcode((const unsigned char *)Buffer->getBufferStart(),
  37                 (const unsigned char *)Buffer->getBufferEnd())) {
  38     Expected<std::unique_ptr<Module>> ModuleOrErr = getOwningLazyBitcodeModule(
  39         std::move(Buffer), Context, ShouldLazyLoadMetadata);
  40     if (Error E = ModuleOrErr.takeError()) {
  41       handleAllErrors(std::move(E), [&](ErrorInfoBase &EIB) {
  42         Err = SMDiagnostic(Buffer->getBufferIdentifier(), SourceMgr::DK_Error,
  43                            EIB.message());
  44       });
  45       return nullptr;
  46     }
  47     return std::move(ModuleOrErr.get());
  48   }
  49
  50   return parseAssembly(Buffer->getMemBufferRef(), Err, Context);
  51 }
  52
  53 std::unique_ptr<Module> llvm::getLazyIRFileModule(StringRef Filename,
  54                                                   SMDiagnostic &Err,
  55                                                   LLVMContext &Context,
  56                                                   bool ShouldLazyLoadMetadata) {
  57   ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
  58       MemoryBuffer::getFileOrSTDIN(Filename);
  59   if (std::error_code EC = FileOrErr.getError()) {
  60     Err = SMDiagnostic(Filename, SourceMgr::DK_Error,
  61                        "Could not open input file: " + EC.message());
  62     return nullptr;
  63   }
  64
  65   return getLazyIRModule(std::move(FileOrErr.get()), Err, Context,
  66                          ShouldLazyLoadMetadata);
  67 }
  68
  69 std::unique_ptr<Module> llvm::parseIR(MemoryBufferRef Buffer, SMDiagnostic &Err,
  70                                       LLVMContext &Context,
  71                                       ParserCallbacks Callbacks) {
  72   NamedRegionTimer T(TimeIRParsingName, TimeIRParsingDescription,
  73                      TimeIRParsingGroupName, TimeIRParsingGroupDescription,
  74                      TimePassesIsEnabled);
  75   if (isBitcode((const unsigned char *)Buffer.getBufferStart(),
  76                 (const unsigned char *)Buffer.getBufferEnd())) {
  77     Expected<std::unique_ptr<Module>> ModuleOrErr =
  78         parseBitcodeFile(Buffer, Context, Callbacks);
  79     if (Error E = ModuleOrErr.takeError()) {
  80       handleAllErrors(std::move(E), [&](ErrorInfoBase &EIB) {
  81         Err = SMDiagnostic(Buffer.getBufferIdentifier(), SourceMgr::DK_Error,
  82                            EIB.message());
  83       });
  84       return nullptr;
  85     }
  86     return std::move(ModuleOrErr.get());
  87   }
  88
  89   return parseAssembly(Buffer, Err, Context, nullptr,
  90                        Callbacks.DataLayout.value_or(
  91                            [](StringRef, StringRef) { return std::nullopt; }));
  92 }
  93
  94 std::unique_ptr<Module> llvm::parseIRFile(StringRef Filename, SMDiagnostic &Err,
  95                                           LLVMContext &Context,
  96                                           ParserCallbacks Callbacks) {
  97   ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
  98       MemoryBuffer::getFileOrSTDIN(Filename, /*IsText=*/true);
  99   if (std::error_code EC = FileOrErr.getError()) {
 100     Err = SMDiagnostic(Filename, SourceMgr::DK_Error,
 101                        "Could not open input file: " + EC.message());
 102     return nullptr;
 103   }
 104
 105   return parseIR(FileOrErr.get()->getMemBufferRef(), Err, Context, Callbacks);
 106 }
 107
 108 //===----------------------------------------------------------------------===//
 109 // C API.
 110 //===----------------------------------------------------------------------===//
 111
 112 LLVMBool LLVMParseIRInContext(LLVMContextRef ContextRef,
 113                               LLVMMemoryBufferRef MemBuf, LLVMModuleRef *OutM,
 114                               char **OutMessage) {
 115   SMDiagnostic Diag;
 116
 117   std::unique_ptr<MemoryBuffer> MB(unwrap(MemBuf));
 118   *OutM =
 119       wrap(parseIR(MB->getMemBufferRef(), Diag, *unwrap(ContextRef)).release());
 120
 121   if(!*OutM) {
 122     if (OutMessage) {
 123       std::string buf;
 124       raw_string_ostream os(buf);
 125
 126       Diag.print(nullptr, os, false);
 127       os.flush();
 128
 129       *OutMessage = strdup(buf.c_str());
 130     }
 131     return 1;
 132   }
 133
 134   return 0;
 135 }