lib/AsmParser/Parser.cpp

   1 //===- Parser.cpp - Main dispatch module for the Parser library -----------===//
   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 // This library implements the functionality defined in llvm/AsmParser/Parser.h
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "llvm/AsmParser/Parser.h"
  15 #include "LLParser.h"
  16 #include "llvm/ADT/STLExtras.h"
  17 #include "llvm/IR/Module.h"
  18 #include "llvm/Support/MemoryBuffer.h"
  19 #include "llvm/Support/SourceMgr.h"
  20 #include "llvm/Support/raw_ostream.h"
  21 #include <cstring>
  22 #include <system_error>
  23 using namespace llvm;
  24
  25 bool llvm::parseAssemblyInto(MemoryBufferRef F, Module &M, SMDiagnostic &Err,
  26                              SlotMapping *Slots) {
  27   SourceMgr SM;
  28   std::unique_ptr<MemoryBuffer> Buf = MemoryBuffer::getMemBuffer(F);
  29   SM.AddNewSourceBuffer(std::move(Buf), SMLoc());
  30
  31   return LLParser(F.getBuffer(), SM, Err, &M, Slots).Run();
  32 }
  33
  34 std::unique_ptr<Module> llvm::parseAssembly(MemoryBufferRef F,
  35                                             SMDiagnostic &Err,
  36                                             LLVMContext &Context,
  37                                             SlotMapping *Slots) {
  38   std::unique_ptr<Module> M =
  39       make_unique<Module>(F.getBufferIdentifier(), Context);
  40
  41   if (parseAssemblyInto(F, *M, Err, Slots))
  42     return nullptr;
  43
  44   return M;
  45 }
  46
  47 std::unique_ptr<Module> llvm::parseAssemblyFile(StringRef Filename,
  48                                                 SMDiagnostic &Err,
  49                                                 LLVMContext &Context,
  50                                                 SlotMapping *Slots) {
  51   ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
  52       MemoryBuffer::getFileOrSTDIN(Filename);
  53   if (std::error_code EC = FileOrErr.getError()) {
  54     Err = SMDiagnostic(Filename, SourceMgr::DK_Error,
  55                        "Could not open input file: " + EC.message());
  56     return nullptr;
  57   }
  58
  59   return parseAssembly(FileOrErr.get()->getMemBufferRef(), Err, Context, Slots);
  60 }
  61
  62 std::unique_ptr<Module> llvm::parseAssemblyString(StringRef AsmString,
  63                                                   SMDiagnostic &Err,
  64                                                   LLVMContext &Context,
  65                                                   SlotMapping *Slots) {
  66   MemoryBufferRef F(AsmString, "<string>");
  67   return parseAssembly(F, Err, Context, Slots);
  68 }
  69
  70 Constant *llvm::parseConstantValue(StringRef Asm, SMDiagnostic &Err,
  71                                    const Module &M, const SlotMapping *Slots) {
  72   SourceMgr SM;
  73   std::unique_ptr<MemoryBuffer> Buf = MemoryBuffer::getMemBuffer(Asm);
  74   SM.AddNewSourceBuffer(std::move(Buf), SMLoc());
  75   Constant *C;
  76   if (LLParser(Asm, SM, Err, const_cast<Module *>(&M))
  77           .parseStandaloneConstantValue(C, Slots))
  78     return nullptr;
  79   return C;
  80 }
  81
  82 Type *llvm::parseType(StringRef Asm, SMDiagnostic &Err, const Module &M,
  83                       const SlotMapping *Slots) {
  84   unsigned Read;
  85   Type *Ty = parseTypeAtBeginning(Asm, Read, Err, M, Slots);
  86   if (!Ty)
  87     return nullptr;
  88   if (Read != Asm.size()) {
  89     SourceMgr SM;
  90     std::unique_ptr<MemoryBuffer> Buf = MemoryBuffer::getMemBuffer(Asm);
  91     SM.AddNewSourceBuffer(std::move(Buf), SMLoc());
  92     Err = SM.GetMessage(SMLoc::getFromPointer(Asm.begin() + Read),
  93                         SourceMgr::DK_Error, "expected end of string");
  94     return nullptr;
  95   }
  96   return Ty;
  97 }
  98 Type *llvm::parseTypeAtBeginning(StringRef Asm, unsigned &Read,
  99                                  SMDiagnostic &Err, const Module &M,
 100                                  const SlotMapping *Slots) {
 101   SourceMgr SM;
 102   std::unique_ptr<MemoryBuffer> Buf = MemoryBuffer::getMemBuffer(Asm);
 103   SM.AddNewSourceBuffer(std::move(Buf), SMLoc());
 104   Type *Ty;
 105   if (LLParser(Asm, SM, Err, const_cast<Module *>(&M))
 106           .parseTypeAtBeginning(Ty, Read, Slots))
 107     return nullptr;
 108   return Ty;
 109 }