CIndexInclusionStack.cpp revision f62d43d2afe1960755a1b5813cae1e5983bcac1b 
1//===- CIndexInclusionStack.cpp - Clang-C Source Indexing 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 file defines a callback mechanism for clients to get the inclusion
11// stack from a translation unit.
12//
13//===----------------------------------------------------------------------===//
14
15#include "CIndexer.h"
16#include "CXTranslationUnit.h"
17#include "CXSourceLocation.h"
18#include "clang/AST/DeclVisitor.h"
19#include "clang/Frontend/ASTUnit.h"
20#include "llvm/ADT/SmallString.h"
21#include "llvm/Support/raw_ostream.h"
22using namespace clang;
23
24extern "C" {
25void clang_getInclusions(CXTranslationUnit TU, CXInclusionVisitor CB,
26                         CXClientData clientData) {
27
28  ASTUnit *CXXUnit = static_cast<ASTUnit *>(TU->TUData);
29  SourceManager &SM = CXXUnit->getSourceManager();
30  ASTContext &Ctx = CXXUnit->getASTContext();
31
32  llvm::SmallVector<CXSourceLocation, 10> InclusionStack;
33  unsigned n =  SM.local_sloc_entry_size();
34
35  // In the case where all the SLocEntries are in an external source, traverse
36  // those SLocEntries as well.  This is the case where we are looking
37  // at the inclusion stack of an AST/PCH file.
38  const SrcMgr::SLocEntry &(SourceManager::*Getter)(unsigned, bool*) const;
39  if (n == 1) {
40    Getter = &SourceManager::getLoadedSLocEntry;
41    n = SM.loaded_sloc_entry_size();
42  } else
43    Getter = &SourceManager::getLocalSLocEntry;
44
45  for (unsigned i = 0 ; i < n ; ++i) {
46    bool Invalid = false;
47    const SrcMgr::SLocEntry &SL = (SM.*Getter)(i, &Invalid);
48
49    if (!SL.isFile() || Invalid)
50      continue;
51
52    const SrcMgr::FileInfo &FI = SL.getFile();
53    if (!FI.getContentCache()->OrigEntry)
54      continue;
55
56    // Build the inclusion stack.
57    SourceLocation L = FI.getIncludeLoc();
58    InclusionStack.clear();
59    while (L.isValid()) {
60      PresumedLoc PLoc = SM.getPresumedLoc(L);
61      InclusionStack.push_back(cxloc::translateSourceLocation(Ctx, L));
62      L = PLoc.isValid()? PLoc.getIncludeLoc() : SourceLocation();
63    }
64
65    // Callback to the client.
66    // FIXME: We should have a function to construct CXFiles.
67    CB((CXFile) FI.getContentCache()->OrigEntry,
68       InclusionStack.data(), InclusionStack.size(), clientData);
69  }
70}
71} // end extern C
72