[cfe-dev] libtooling fails to traverse TranslationUnitDecl

[xiaohui chen]

HI there:

My clang is 3.4.1 . I have a very simple libtooling code which just visit
the functiondecl.
but   function "bool VisitFunctionDecl(FunctionDecl *func)" is never called
in line 35, who can answer me?

please see the following output, even i can output the AST in line 53.

===============================================================================
 llvm/tools/clang/tools/example$ ./Example test.c --
TranslationUnitDecl 0x3225610 <<invalid sloc>><look for declarations>
|-TypedefDecl 0x3225b20 <<invalid sloc>> __int128_t '__int128'<look for
declarations>
|-TypedefDecl 0x3225b80 <<invalid sloc>> __uint128_t 'unsigned
__int128'<look for declarations>
|-TypedefDecl 0x3225ed0 <<invalid sloc>> __builtin_va_list '__va_list_tag
[1]'<look for declarations>
`-FunctionDecl 0x3225f70
</home/xiaohui/llvm/llvm/tools/clang/tools/example/test.c:1:1, line:2:1>
do_math 'void ()'
  `-CompoundStmt 0x3226018 <line:1:16, line:2:1>

Found 0 functions.

===============================================================================

1 #include "clang/Driver/Options.h"
  2 #include "clang/AST/AST.h"
  3 #include "clang/AST/ASTContext.h"
  4 #include "clang/AST/ASTConsumer.h"
  5 #include "clang/AST/RecursiveASTVisitor.h"
  6 #include "clang/Frontend/ASTConsumers.h"
  7 #include "clang/Frontend/FrontendActions.h"
  8 #include "clang/Frontend/CompilerInstance.h"
  9 #include "clang/Tooling/CommonOptionsParser.h"
 10 #include "clang/Tooling/Tooling.h"
 11 #include "clang/Rewrite/Core/Rewriter.h"
 12 #include "llvm/Support/raw_ostream.h"
 13
 14 using namespace std;
 15 using namespace clang;
 16 using namespace clang::driver;
 17 using namespace clang::tooling;
 18 using namespace llvm;
 19
 20 Rewriter rewriter;
 21 int numFunctions = 0;
 22
 23
 24 class ExampleVisitor : public RecursiveASTVisitor<ExampleVisitor> {
 25 private:
 26     ASTContext *astContext; // used for getting additional AST info
 27
 28 public:
 29     explicit ExampleVisitor(CompilerInstance *CI)
 30       : astContext(&(CI->getASTContext())) // initialize private members
 31     {
 32         rewriter.setSourceMgr(astContext->getSourceManager(),
astContext->getLangOpts());
 33     }
 34
 35      bool VisitFunctionDecl(FunctionDecl *func) {
 36         numFunctions++;
 37         return true;
 38     }
39 };
 40
 41 class ExampleASTConsumer : public ASTConsumer {
 42 private:
 43     ExampleVisitor *visitor; // doesn't have to be private
 44
 45 public:
 46     // override the constructor in order to pass CI
 47     explicit ExampleASTConsumer(CompilerInstance *CI)
 48         : visitor(new ExampleVisitor(CI)) // initialize the visitor
 49     { }
 50
 51     // override this to call our ExampleVisitor on the entire source
file
 52     virtual void HandleTranslationUnit(ASTContext &Context) {
 53            Context.getTranslationUnitDecl()->dump();
 54
 55       visitor->TraverseDecl(Context.getTranslationUnitDecl());
 56     }
 57
 58 };
 59
 60 class ExampleFrontendAction : public ASTFrontendAction {
 61 public:
 62     virtual ASTConsumer *CreateASTConsumer(CompilerInstance &CI,
StringRef file) {
 63         return new ExampleASTConsumer(&CI); // pass CI pointer to
ASTConsumer
 64     }
 65 };
 66
 67 int main(int argc, const char **argv) {
 68     CommonOptionsParser op(argc, argv);
 69     ClangTool Tool(op.getCompilations(), op.getSourcePathList());
 70
 71     int result =
Tool.run(newFrontendActionFactory<ExampleFrontendAction>());
 72
 73     errs() << "\nFound " << numFunctions << " functions.\n\n";
 74     return result;
 75 }
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