[cfe-dev] libtooling fails to traverse TranslationUnitDecl

[Manuel Klimek]

At a first glance this looks like it should work.

On Mon Dec 29 2014 at 7:26:26 AM xiaohui chen <xchen198812 at gmail.com> wrote:

> sorry, i  forget to attach my test.c file
> ===================
> void do_math() {
> }
>
>
> On Sun, Dec 28, 2014 at 11:46 PM, xiaohui chen <xchen198812 at gmail.com>
> wrote:
>
>> 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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