Parser.cpp revision 31895e73591d3c9ceae731a1274c8f56194b9616 
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>
21using namespace llvm;
22
23Module *llvm::ParseAssemblyFile(const std::string &Filename, ParseError &Err,
24                                const LLVMContext& Context) {
25  Err.setFilename(Filename);
26
27  std::string ErrorStr;
28  OwningPtr<MemoryBuffer>
29    F(MemoryBuffer::getFileOrSTDIN(Filename.c_str(), &ErrorStr));
30  if (F == 0) {
31    Err.setError("Could not open input file '" + Filename + "'");
32    return 0;
33  }
34
35  OwningPtr<Module> M(new Module(Filename, Context));
36  if (LLParser(F.get(), Err, M.get()).Run())
37    return 0;
38  return M.take();
39}
40
41Module *llvm::ParseAssemblyString(const char *AsmString, Module *M,
42                                  ParseError &Err, const LLVMContext& Context) {
43  Err.setFilename("<string>");
44
45  OwningPtr<MemoryBuffer>
46    F(MemoryBuffer::getMemBuffer(AsmString, AsmString+strlen(AsmString),
47                                 "<string>"));
48
49  // If we are parsing into an existing module, do it.
50  if (M)
51    return LLParser(F.get(), Err, M).Run() ? 0 : M;
52
53  // Otherwise create a new module.
54  OwningPtr<Module> M2(new Module("<string>", Context));
55  if (LLParser(F.get(), Err, M2.get()).Run())
56    return 0;
57  return M2.take();
58}
59
60
61//===------------------------------------------------------------------------===
62//                              ParseError Class
63//===------------------------------------------------------------------------===
64
65void ParseError::PrintError(const char *ProgName, raw_ostream &S) {
66  errs() << ProgName << ": ";
67  if (Filename == "-")
68    errs() << "<stdin>";
69  else
70    errs() << Filename;
71
72  if (LineNo != -1) {
73    errs() << ':' << LineNo;
74    if (ColumnNo != -1)
75      errs() << ':' << (ColumnNo+1);
76  }
77
78  errs() << ": " << Message << '\n';
79
80  if (LineNo != -1 && ColumnNo != -1) {
81    errs() << LineContents << '\n';
82
83    // Print out spaces/tabs before the caret.
84    for (unsigned i = 0; i != unsigned(ColumnNo); ++i)
85      errs() << (LineContents[i] == '\t' ? '\t' : ' ');
86    errs() << "^\n";
87  }
88}
89