[cfe-dev] ASTs of multiple files - C API clang

[Socrates Katsoulacos]

Hello,

I am building a program in which I need to have the ASTs of multiple source
files.
Except the main file that I give to clang and using the ASTConsumer, etc.
for getting the AST context, I need to do the same for other files since my
main file usually contains functions calls, where the functions are defined
on other files. So, I need the AST of the other files in order to find the
function bodies that are missing. I have the following code which seems ok
since it compiles and runs without crashing. However, I am not sure if it
does what I want to do.
The code is the following (which are inside a class):

        //visit AST
        static CXChildVisitResult TranslationUnitVisitor(CXCursor,
CXCursor, CXClientData data)
        {
     return CXChildVisit_Recurse; // visit complete AST recursivly
        }


      void VisitTranslationUnitWithPCH()
      {
  //create function pointer
  CXChildVisitResult (*pTranslationUnitVisitor)(CXCursor, CXCursor,
CXClientData) = TranslationUnitVisitor;

   //excludeDeclsFromPCH = 1, displayDiagnostics=1
  CXIndex cx_idx = clang_createIndex(1, 1);

   //IndexTest.pch was produced with the following command:
  //"clang -x c test.h -emit-ast -o test.pch"
  system("/home/socrates/llvm/Debug+Asserts/bin/clang -x c test.h -emit-ast
-o test.pch");
  CXTranslationUnit TU = clang_createTranslationUnit(cx_idx, "test.pch");

  //This will load all the symbols from 'test.pch'
  clang_visitChildren(clang_getTranslationUnitCursor(TU),
pTranslationUnitVisitor, 0);
  clang_disposeTranslationUnit(TU);

  //This will load all the symbols from 'test.c', excluding symbols
  //from 'test.pch'.
  char *args[] = { "-include", "test.pch" };
  TU = clang_createTranslationUnitFromSourceFile(cx_idx, "test.c", 2, args,
0, 0);

  clang_visitChildren(clang_getTranslationUnitCursor(TU),
pTranslationUnitVisitor,0);

          //print AST
          CXString cx_str = clang_getTranslationUnitSpelling(TU);
  std::cout << clang_getCString(cx_str);

  clang_disposeTranslationUnit(TU);
    }

At the end of the code I want to print the AST buy it does not return
anything which makes me suspicious and also I get the following many many
times:
test.pch:1:1: error: unknown type name 'CPCH'
test.pch:1:5: error: expected identifier or '('
test.pch:1:7: warning: null character ignored [-Wnull-character]
test.pch:1:8: warning: null character ignored [-Wnull-character]
test.pch:1:11: warning: null character ignored [-Wnull-character]
test.pch:1:12: warning: null character ignored [-Wnull-character]
test.pch:31:2: warning: missing terminating '"' character
test.pch:34:2: warning: missing terminating '"' character
test.pch:42:8: warning: null character ignored [-Wnull-character]
test.pch:47:107: warning: null character ignored [-Wnull-character]
test.pch:47:110: warning: null character ignored [-Wnull-character]
test.pch:51:2: warning: null character ignored [-Wnull-character]
test.pch:60:5: warning: null character ignored [-Wnull-character]
etc....

Is there anything that I am missing ? Am I doing some thing wrong in order
to get the AST ? Is there any other way to do what I am looking for ?
In addition, from the CXTranslationUnit can I get somehow the context ?

I would be really grateful for some help with this.

Socrates
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