build and run.txt

How I build:

$HOME/Downloads/clang+llvm-3.8.0-x86_64-apple-darwin/bin/clang++ \
    -fno-rtti -O0 -g \
        -I/Users/xaxxon/Downloads/clang+llvm-3.8.0-x86_64-apple-darwin/include \
    -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk/ \
    -fPIC -fvisibility-inlines-hidden -Wall -W -Wno-unused-parameter -Wwrite-strings -Wcast-qual \
    -Wmissing-field-initializers -pedantic -Wno-long-long -Wcovered-switch-default -Wnon-virtual-dtor \
    -Wdelete-non-virtual-dtor -Werror=date-time -std=c++11 -O3 -DNDEBUG  -fno-exceptions -fno-rtti \
    -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS \
        class_parser.cpp \
    `$HOME/Downloads/clang+llvm-3.8.0-x86_64-apple-darwin//bin/llvm-config --ldflags --libs --system-libs` \
        -dynamiclib -o class_parser.dylib\
        \
        \
        -l LLVMAArch64AsmParser \
        -l clangFrontend \
        -L/Users/xaxxon/Downloads/clang+llvm-3.8.0-x86_64-apple-darwin/lib -Wl,-search_paths_first -Wl,-headerpad_max_install_names \
        -lclangFrontend \
        -lLLVMLTO -lclangSerialization -lclangASTMatchers -lclangSema -lclangAnalysis -lclangRewriteFrontend -lclangEdit -lclangParse -lclangFrontend -lclangBasic -lclangDriver -lclangAST -lclangLex -lLLVMObjCARCOpts -lLLVMSymbolize -lLLVMDebugInfoPDB -lLLVMDebugInfoDWARF -lLLVMXCoreDisassembler -lLLVMXCoreCodeGen -lLLVMXCoreDesc -lLLVMXCoreInfo -lLLVMXCoreAsmPrinter -lLLVMSystemZDisassembler -lLLVMSystemZCodeGen -lLLVMSystemZAsmParser -lLLVMSystemZDesc -lLLVMSystemZInfo -lLLVMSystemZAsmPrinter -lLLVMSparcDisassembler -lLLVMSparcCodeGen -lLLVMSparcAsmParser -lLLVMSparcDesc -lLLVMSparcInfo -lLLVMSparcAsmPrinter -lLLVMPowerPCDisassembler -lLLVMPowerPCCodeGen -lLLVMPowerPCAsmParser -lLLVMPowerPCDesc -lLLVMPowerPCInfo -lLLVMPowerPCAsmPrinter -lLLVMNVPTXCodeGen -lLLVMNVPTXDesc -lLLVMNVPTXInfo -lLLVMNVPTXAsmPrinter -lLLVMMSP430CodeGen -lLLVMMSP430Desc -lLLVMMSP430Info -lLLVMMSP430AsmPrinter -lLLVMMipsDisassembler -lLLVMMipsCodeGen -lLLVMMipsAsmParser -lLLVMMipsDesc -lLLVMMipsInfo -lLLVMMipsAsmPrinter -lLLVMHexagonDisassembler -lLLVMHexagonCodeGen -lLLVMHexagonAsmParser -lLLVMHexagonDesc -lLLVMHexagonInfo -lLLVMCppBackendCodeGen -lLLVMCppBackendInfo -lLLVMBPFCodeGen -lLLVMBPFDesc -lLLVMBPFInfo -lLLVMBPFAsmPrinter -lLLVMARMDisassembler -lLLVMARMCodeGen -lLLVMARMAsmParser -lLLVMARMDesc -lLLVMARMInfo -lLLVMARMAsmPrinter -lLLVMAMDGPUCodeGen -lLLVMAMDGPUAsmParser -lLLVMAMDGPUDesc -lLLVMAMDGPUUtils -lLLVMAMDGPUInfo -lLLVMAMDGPUAsmPrinter -lLLVMAArch64Disassembler -lLLVMAArch64CodeGen -lLLVMAArch64AsmParser -lLLVMAArch64Desc -lLLVMAArch64Info -lLLVMAArch64AsmPrinter -lLLVMAArch64Utils -lLLVMMIRParser -lLLVMLibDriver -lLLVMOption -lLLVMTableGen -lLLVMLineEditor -lLLVMX86Disassembler -lLLVMX86AsmParser -lLLVMX86CodeGen -lLLVMSelectionDAG -lLLVMAsmPrinter -lLLVMX86Desc -lLLVMMCDisassembler -lLLVMX86Info -lLLVMX86AsmPrinter -lLLVMX86Utils -lLLVMMCJIT -lLLVMPasses -lLLVMipo -lLLVMVectorize -lLLVMLinker -lLLVMIRReader -lLLVMAsmParser -lLLVMDebugInfoCodeView -lLLVMInterpreter -lLLVMCodeGen -lLLVMScalarOpts -lLLVMInstCombine -lLLVMInstrumentation -lLLVMProfileData -lLLVMBitWriter -lLLVMOrcJIT -lLLVMTransformUtils -lLLVMExecutionEngine -lLLVMTarget -lLLVMAnalysis -lLLVMRuntimeDyld -lLLVMObject -lLLVMMCParser -lLLVMBitReader -lLLVMMC -lLLVMCore -lLLVMSupport \
        -lcurses -lpthread -lz -lm \




how I run:




$HOME/Downloads/clang+llvm-3.8.0-x86_64-apple-darwin/bin/clang++ \
          -D_GNU_SOURCE -D_DEBUG -D__STDC_CONSTANT_MACROS \
          -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -D_GNU_SOURCE \
          -I$BD/tools/clang/include -Itools/clang/include -I$BD/include -Iinclude \
              sample.cpp \
          -fsyntax-only \
          -Xclang -load \
          -Xclang class_parser.dylib \
          -Xclang -plugin \
          -Xclang print-fns

class name printer clang plugin.cpp

// https://github.com/eliben/llvm-clang-samples/blob/master/src_clang/matchers_rewriter.cpp
// http://clang.llvm.org/doxygen/classclang_1_1CXXRecordDecl.html
// http://clang.llvm.org/docs/LibASTMatchersReference.html

#include "clang/Frontend/FrontendPluginRegistry.h"
#include "clang/AST/AST.h"
#include "clang/AST/ASTConsumer.h"
#include "clang/ASTMatchers/ASTMatchers.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
#include "clang/Frontend/CompilerInstance.h"
#include "clang/Frontend/FrontendActions.h"
#include "clang/Tooling/CommonOptionsParser.h"
#include "clang/Tooling/Tooling.h"
#include "clang/Rewrite/Core/Rewriter.h"
#include "llvm/Support/raw_ostream.h"

using namespace clang;
using namespace clang::ast_matchers;
using namespace clang::driver;
using namespace clang::tooling;


namespace {

class ClassHandler : public MatchFinder::MatchCallback {
public:
    ClassHandler() = default;
    virtual void run(const MatchFinder::MatchResult &Result) {
        printf("HI\n");
        if (const CXXRecordDecl * klass = Result.Nodes.getNodeAs<clang::CXXRecordDecl>("class")) {
            if (dyn_cast<NamedDecl>(klass)) {
                auto named_class = dyn_cast<NamedDecl>(klass);

                printf("It has a name: %s\n", named_class->getQualifiedNameAsString().c_str());
            }

            printf("from the inside\n");
        }
    }
};


    class MyASTConsumer : public ASTConsumer {
    public:
        MyASTConsumer()  {
            Matcher.addMatcher(cxxRecordDecl(isStruct()).bind("class"),
                &HandlerForClass);
        }

        void HandleTranslationUnit(ASTContext &Context) override {
            // Run the matchers when we have the whole TU parsed.
            Matcher.matchAST(Context);
        }

    private:
        ClassHandler HandlerForClass;
        MatchFinder Matcher;
    };


    // This is the class that is registered with LLVM.  PluginASTAction is-a ASTFrontEndAction
    class PrintFunctionNamesAction : public PluginASTAction {
    protected:

        // The value returned here is used internally to run checks against
        std::unique_ptr<ASTConsumer> CreateASTConsumer(CompilerInstance &CI,
                                                       llvm::StringRef) {
            return llvm::make_unique<MyASTConsumer>();
        }

        bool ParseArgs(const CompilerInstance &CI,
                       const std::vector<std::string> &args) {
            for (unsigned i = 0, e = args.size(); i != e; ++i) {
                llvm::errs() << "PrintFunctionNames arg = " << args[i] << "\n";

                // Example error handling.
                if (args[i] == "-an-error") {
                    DiagnosticsEngine &D = CI.getDiagnostics();
                    unsigned DiagID = D.getCustomDiagID(DiagnosticsEngine::Error,
                                                        "invalid argument '%0'");
                    D.Report(DiagID) << args[i];
                    return false;
                }
            }
            if (args.size() && args[0] == "help")
                PrintHelp(llvm::errs());

            return true;
        }
        void PrintHelp(llvm::raw_ostream &ros) {
            ros << "Help for PrintFunctionNames plugin goes here\n";
        }
    };
}

static FrontendPluginRegistry::Add<PrintFunctionNamesAction>
        X("print-fns", "print function names");