Parser.cpp revision 5d13665c09c0173b30d3dcc64498169f6fec2246 
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  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
40Module *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
64void 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}
88