Add a trivial example plugin, which prints the names of the top-level decls.

 - The build scriptage is about twice as long as the code, which is nice. :)

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@88826 91177308-0d34-0410-b5e6-96231b3b80d8

examples/Makefile

@@ -9,6 +9,6 @@
 
 LEVEL = ../../..
 
-PARALLEL_DIRS := wpa
+PARALLEL_DIRS := PrintFunctionNames wpa
 
 include $(LEVEL)/Makefile.common

examples/PrintFunctionNames/CMakeLists.txt

+set(SHARED_LIBRARY TRUE)
+
+set(LLVM_NO_RTTI 1)
+
+set(LLVM_USED_LIBS
+  clangFrontend clangIndex clangSema clangAnalysis clangAST clangParse clangLex clangBasic)
+
+set( LLVM_LINK_COMPONENTS
+  MC
+  support
+  )
+
+add_clang_library(PrintFunctionNames PrintFunctionNames.cpp)
+
+set_target_properties(PrintFunctionNames
+  PROPERTIES
+  LINKER_LANGUAGE CXX)

examples/PrintFunctionNames/Makefile

+##===- examples/PrintFunctionNames/Makefile ----------------*- Makefile -*-===##
+# 
+#                     The LLVM Compiler Infrastructure
+#
+# This file is distributed under the University of Illinois Open Source
+# License. See LICENSE.TXT for details.
+# 
+##===----------------------------------------------------------------------===##
+
+LEVEL = ../../../..
+LIBRARYNAME = PrintFunctionNames
+
+CPPFLAGS += -I$(PROJ_SRC_DIR)/../../include -I$(PROJ_OBJ_DIR)/../../include
+CXXFLAGS = -fno-rtti
+
+# Include this here so we can get the configuration of the targets that have
+# been configured for construction. We have to do this early so we can set up
+# LINK_COMPONENTS before including Makefile.rules
+include $(LEVEL)/Makefile.config
+
+LINK_LIBS_IN_SHARED = 1
+SHARED_LIBRARY = 1
+
+LINK_COMPONENTS := MC support
+USEDLIBS = clangFrontend.a clangIndex.a clangSema.a clangAnalysis.a clangAST.a clangParse.a clangLex.a clangBasic.a
+
+include $(LEVEL)/Makefile.common

examples/PrintFunctionNames/PrintFunctionNames.cpp

+//===- PrintFunctionNames.cpp ---------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Example clang-cc plugin which simply prints the names of all the top-level
+// decls in the input file.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Frontend/FrontendPluginRegistry.h"
+#include "clang/AST/ASTConsumer.h"
+#include "clang/AST/AST.h"
+#include "llvm/Support/raw_ostream.h"
+using namespace clang;
+
+namespace {
+
+class PrintFunctionsConsumer : public ASTConsumer {
+public:
+  virtual void HandleTopLevelDecl(DeclGroupRef DG) {
+    for (DeclGroupRef::iterator i = DG.begin(), e = DG.end(); i != e; ++i) {
+      const Decl *D = *i;
+      if (const NamedDecl *ND = dyn_cast<NamedDecl>(D))
+        llvm::errs() << "top-level-decl: \"" << ND->getNameAsString() << "\"\n";
+    }
+  }
+}; 
+
+class PrintFunctionNamesAction : public ASTFrontendAction {
+protected:
+  ASTConsumer *CreateASTConsumer(CompilerInstance &CI, llvm::StringRef) {
+    return new PrintFunctionsConsumer();
+  }
+};
+
+}
+
+FrontendPluginRegistry::Add<PrintFunctionNamesAction>
+X("print-fns", "print function names");