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/Assembly/Parser.h
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "llvm/Assembly/Parser.h"
  15 #include "LLParser.h"
  16 #include "llvm/Module.h"
  17 #include "llvm/ADT/OwningPtr.h"
  18 #include "llvm/Support/MemoryBuffer.h"
  19 #include "llvm/Support/raw_ostream.h"
  20 #include <cstring>
  21 using namespace llvm;
  22
  23 Module *llvm::ParseAssemblyFile(const std::string &Filename, ParseError &Err) {
  24   Err.setFilename(Filename);
  25
  26   std::string ErrorStr;
  27   OwningPtr<MemoryBuffer>
  28     F(MemoryBuffer::getFileOrSTDIN(Filename.c_str(), &ErrorStr));
  29   if (F == 0) {
  30     Err.setError("Could not open input file '" + Filename + "'");
  31     return 0;
  32   }
  33
  34   OwningPtr<Module> M(new Module(Filename));
  35   if (LLParser(F.get(), Err, M.get()).Run())
  36     return 0;
  37   return M.take();
  38 }
  39
  40 Module *llvm::ParseAssemblyString(const char *AsmString, Module *M,
  41                                   ParseError &Err) {
  42   Err.setFilename("<string>");
  43
  44   OwningPtr<MemoryBuffer>
  45     F(MemoryBuffer::getMemBuffer(AsmString, AsmString+strlen(AsmString),
  46                                  "<string>"));
  47
  48   // If we are parsing into an existing module, do it.
  49   if (M)
  50     return LLParser(F.get(), Err, M).Run() ? 0 : M;
  51
  52   // Otherwise create a new module.
  53   OwningPtr<Module> M2(new Module("<string>"));
  54   if (LLParser(F.get(), Err, M2.get()).Run())
  55     return 0;
  56   return M2.take();
  57 }
  58
  59
  60 //===------------------------------------------------------------------------===
  61 //                              ParseError Class
  62 //===------------------------------------------------------------------------===
  63
  64 void ParseError::PrintError(const char *ProgName, raw_ostream &S) {
  65   errs() << ProgName << ": ";
  66   if (Filename == "-")
  67     errs() << "<stdin>";
  68   else
  69     errs() << Filename;
  70
  71   if (LineNo != -1) {
  72     errs() << ':' << LineNo;
  73     if (ColumnNo != -1)
  74       errs() << ':' << (ColumnNo+1);
  75   }
  76
  77   errs() << ": " << Message << '\n';
  78
  79   if (LineNo != -1 && ColumnNo != -1) {
  80     errs() << LineContents << '\n';
  81
  82     // Print out spaces/tabs before the caret.
  83     for (unsigned i = 0; i != unsigned(ColumnNo); ++i)
  84       errs() << (LineContents[i] == '\t' ? '\t' : ' ');
  85     errs() << "^\n";
  86   }
  87 }