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 "CXSourceLocation.h"
17 #include "CXTranslationUnit.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"
22 using namespace clang;
23 
24 extern "C" {
25 void clang_getInclusions(CXTranslationUnit TU, CXInclusionVisitor CB,
26                          CXClientData clientData) {
27 
28   ASTUnit *CXXUnit = cxtu::getASTUnit(TU);
29   SourceManager &SM = CXXUnit->getSourceManager();
30   ASTContext &Ctx = CXXUnit->getASTContext();
31 
32   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(static_cast<CXFile>(
68          const_cast<FileEntry *>(FI.getContentCache()->OrigEntry)),
69        InclusionStack.data(), InclusionStack.size(), clientData);
70   }
71 }
72 } // end extern C
73